diff options
Diffstat (limited to '')
106 files changed, 5423 insertions, 2972 deletions
@@ -46,7 +46,7 @@ This will run on OpenBSD. It does not yet support sticky sockets. Fwmark is mapp ## Building -This requires an installation of [go](https://golang.org) ≥ 1.17. +This requires an installation of the latest version of [Go](https://go.dev/). ``` $ git clone https://git.zx2c4.com/wireguard-go @@ -56,7 +56,7 @@ $ make ## License - Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in diff --git a/conn/bind_linux.go b/conn/bind_linux.go deleted file mode 100644 index da0670a..0000000 --- a/conn/bind_linux.go +++ /dev/null @@ -1,573 +0,0 @@ -/* SPDX-License-Identifier: MIT - * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. - */ - -package conn - -import ( - "errors" - "net" - "strconv" - "sync" - "syscall" - "unsafe" - - "golang.org/x/sys/unix" - "golang.zx2c4.com/go118/netip" -) - -type ipv4Source struct { - Src [4]byte - Ifindex int32 -} - -type ipv6Source struct { - src [16]byte - // ifindex belongs in dst.ZoneId -} - -type LinuxSocketEndpoint struct { - mu sync.Mutex - dst [unsafe.Sizeof(unix.SockaddrInet6{})]byte - src [unsafe.Sizeof(ipv6Source{})]byte - isV6 bool -} - -func (endpoint *LinuxSocketEndpoint) Src4() *ipv4Source { return endpoint.src4() } -func (endpoint *LinuxSocketEndpoint) Dst4() *unix.SockaddrInet4 { return endpoint.dst4() } -func (endpoint *LinuxSocketEndpoint) IsV6() bool { return endpoint.isV6 } - -func (endpoint *LinuxSocketEndpoint) src4() *ipv4Source { - return (*ipv4Source)(unsafe.Pointer(&endpoint.src[0])) -} - -func (endpoint *LinuxSocketEndpoint) src6() *ipv6Source { - return (*ipv6Source)(unsafe.Pointer(&endpoint.src[0])) -} - -func (endpoint *LinuxSocketEndpoint) dst4() *unix.SockaddrInet4 { - return (*unix.SockaddrInet4)(unsafe.Pointer(&endpoint.dst[0])) -} - -func (endpoint *LinuxSocketEndpoint) dst6() *unix.SockaddrInet6 { - return (*unix.SockaddrInet6)(unsafe.Pointer(&endpoint.dst[0])) -} - -// LinuxSocketBind uses sendmsg and recvmsg to implement a full bind with sticky sockets on Linux. -type LinuxSocketBind struct { - // mu guards sock4 and sock6 and the associated fds. - // As long as someone holds mu (read or write), the associated fds are valid. - mu sync.RWMutex - sock4 int - sock6 int -} - -func NewLinuxSocketBind() Bind { return &LinuxSocketBind{sock4: -1, sock6: -1} } -func NewDefaultBind() Bind { return NewLinuxSocketBind() } - -var _ Endpoint = (*LinuxSocketEndpoint)(nil) -var _ Bind = (*LinuxSocketBind)(nil) - -func (*LinuxSocketBind) ParseEndpoint(s string) (Endpoint, error) { - var end LinuxSocketEndpoint - e, err := netip.ParseAddrPort(s) - if err != nil { - return nil, err - } - - if e.Addr().Is4() { - dst := end.dst4() - end.isV6 = false - dst.Port = int(e.Port()) - dst.Addr = e.Addr().As4() - end.ClearSrc() - return &end, nil - } - - if e.Addr().Is6() { - zone, err := zoneToUint32(e.Addr().Zone()) - if err != nil { - return nil, err - } - dst := end.dst6() - end.isV6 = true - dst.Port = int(e.Port()) - dst.ZoneId = zone - dst.Addr = e.Addr().As16() - end.ClearSrc() - return &end, nil - } - - return nil, errors.New("invalid IP address") -} - -func (bind *LinuxSocketBind) Open(port uint16) ([]ReceiveFunc, uint16, error) { - bind.mu.Lock() - defer bind.mu.Unlock() - - var err error - var newPort uint16 - var tries int - - if bind.sock4 != -1 || bind.sock6 != -1 { - return nil, 0, ErrBindAlreadyOpen - } - - originalPort := port - -again: - port = originalPort - var sock4, sock6 int - // Attempt ipv6 bind, update port if successful. - sock6, newPort, err = create6(port) - if err != nil { - if !errors.Is(err, syscall.EAFNOSUPPORT) { - return nil, 0, err - } - } else { - port = newPort - } - - // Attempt ipv4 bind, update port if successful. - sock4, newPort, err = create4(port) - if err != nil { - if originalPort == 0 && errors.Is(err, syscall.EADDRINUSE) && tries < 100 { - unix.Close(sock6) - tries++ - goto again - } - if !errors.Is(err, syscall.EAFNOSUPPORT) { - unix.Close(sock6) - return nil, 0, err - } - } else { - port = newPort - } - - var fns []ReceiveFunc - if sock4 != -1 { - bind.sock4 = sock4 - fns = append(fns, bind.receiveIPv4) - } - if sock6 != -1 { - bind.sock6 = sock6 - fns = append(fns, bind.receiveIPv6) - } - if len(fns) == 0 { - return nil, 0, syscall.EAFNOSUPPORT - } - return fns, port, nil -} - -func (bind *LinuxSocketBind) SetMark(value uint32) error { - bind.mu.RLock() - defer bind.mu.RUnlock() - - if bind.sock6 != -1 { - err := unix.SetsockoptInt( - bind.sock6, - unix.SOL_SOCKET, - unix.SO_MARK, - int(value), - ) - - if err != nil { - return err - } - } - - if bind.sock4 != -1 { - err := unix.SetsockoptInt( - bind.sock4, - unix.SOL_SOCKET, - unix.SO_MARK, - int(value), - ) - - if err != nil { - return err - } - } - - return nil -} - -func (bind *LinuxSocketBind) Close() error { - // Take a readlock to shut down the sockets... - bind.mu.RLock() - if bind.sock6 != -1 { - unix.Shutdown(bind.sock6, unix.SHUT_RDWR) - } - if bind.sock4 != -1 { - unix.Shutdown(bind.sock4, unix.SHUT_RDWR) - } - bind.mu.RUnlock() - // ...and a write lock to close the fd. - // This ensures that no one else is using the fd. - bind.mu.Lock() - defer bind.mu.Unlock() - var err1, err2 error - if bind.sock6 != -1 { - err1 = unix.Close(bind.sock6) - bind.sock6 = -1 - } - if bind.sock4 != -1 { - err2 = unix.Close(bind.sock4) - bind.sock4 = -1 - } - - if err1 != nil { - return err1 - } - return err2 -} - -func (bind *LinuxSocketBind) receiveIPv4(buf []byte) (int, Endpoint, error) { - bind.mu.RLock() - defer bind.mu.RUnlock() - if bind.sock4 == -1 { - return 0, nil, net.ErrClosed - } - var end LinuxSocketEndpoint - n, err := receive4(bind.sock4, buf, &end) - return n, &end, err -} - -func (bind *LinuxSocketBind) receiveIPv6(buf []byte) (int, Endpoint, error) { - bind.mu.RLock() - defer bind.mu.RUnlock() - if bind.sock6 == -1 { - return 0, nil, net.ErrClosed - } - var end LinuxSocketEndpoint - n, err := receive6(bind.sock6, buf, &end) - return n, &end, err -} - -func (bind *LinuxSocketBind) Send(buff []byte, end Endpoint) error { - nend, ok := end.(*LinuxSocketEndpoint) - if !ok { - return ErrWrongEndpointType - } - bind.mu.RLock() - defer bind.mu.RUnlock() - if !nend.isV6 { - if bind.sock4 == -1 { - return net.ErrClosed - } - return send4(bind.sock4, nend, buff) - } else { - if bind.sock6 == -1 { - return net.ErrClosed - } - return send6(bind.sock6, nend, buff) - } -} - -func (end *LinuxSocketEndpoint) SrcIP() netip.Addr { - if !end.isV6 { - return netip.AddrFrom4(end.src4().Src) - } else { - return netip.AddrFrom16(end.src6().src) - } -} - -func (end *LinuxSocketEndpoint) DstIP() netip.Addr { - if !end.isV6 { - return netip.AddrFrom4(end.dst4().Addr) - } else { - return netip.AddrFrom16(end.dst6().Addr) - } -} - -func (end *LinuxSocketEndpoint) DstToBytes() []byte { - if !end.isV6 { - return (*[unsafe.Offsetof(end.dst4().Addr) + unsafe.Sizeof(end.dst4().Addr)]byte)(unsafe.Pointer(end.dst4()))[:] - } else { - return (*[unsafe.Offsetof(end.dst6().Addr) + unsafe.Sizeof(end.dst6().Addr)]byte)(unsafe.Pointer(end.dst6()))[:] - } -} - -func (end *LinuxSocketEndpoint) SrcToString() string { - return end.SrcIP().String() -} - -func (end *LinuxSocketEndpoint) DstToString() string { - var port int - if !end.isV6 { - port = end.dst4().Port - } else { - port = end.dst6().Port - } - return netip.AddrPortFrom(end.DstIP(), uint16(port)).String() -} - -func (end *LinuxSocketEndpoint) ClearDst() { - for i := range end.dst { - end.dst[i] = 0 - } -} - -func (end *LinuxSocketEndpoint) ClearSrc() { - for i := range end.src { - end.src[i] = 0 - } -} - -func zoneToUint32(zone string) (uint32, error) { - if zone == "" { - return 0, nil - } - if intr, err := net.InterfaceByName(zone); err == nil { - return uint32(intr.Index), nil - } - n, err := strconv.ParseUint(zone, 10, 32) - return uint32(n), err -} - -func create4(port uint16) (int, uint16, error) { - - // create socket - - fd, err := unix.Socket( - unix.AF_INET, - unix.SOCK_DGRAM, - 0, - ) - - if err != nil { - return -1, 0, err - } - - addr := unix.SockaddrInet4{ - Port: int(port), - } - - // set sockopts and bind - - if err := func() error { - if err := unix.SetsockoptInt( - fd, - unix.IPPROTO_IP, - unix.IP_PKTINFO, - 1, - ); err != nil { - return err - } - - return unix.Bind(fd, &addr) - }(); err != nil { - unix.Close(fd) - return -1, 0, err - } - - sa, err := unix.Getsockname(fd) - if err == nil { - addr.Port = sa.(*unix.SockaddrInet4).Port - } - - return fd, uint16(addr.Port), err -} - -func create6(port uint16) (int, uint16, error) { - - // create socket - - fd, err := unix.Socket( - unix.AF_INET6, - unix.SOCK_DGRAM, - 0, - ) - - if err != nil { - return -1, 0, err - } - - // set sockopts and bind - - addr := unix.SockaddrInet6{ - Port: int(port), - } - - if err := func() error { - if err := unix.SetsockoptInt( - fd, - unix.IPPROTO_IPV6, - unix.IPV6_RECVPKTINFO, - 1, - ); err != nil { - return err - } - - if err := unix.SetsockoptInt( - fd, - unix.IPPROTO_IPV6, - unix.IPV6_V6ONLY, - 1, - ); err != nil { - return err - } - - return unix.Bind(fd, &addr) - - }(); err != nil { - unix.Close(fd) - return -1, 0, err - } - - sa, err := unix.Getsockname(fd) - if err == nil { - addr.Port = sa.(*unix.SockaddrInet6).Port - } - - return fd, uint16(addr.Port), err -} - -func send4(sock int, end *LinuxSocketEndpoint, buff []byte) error { - - // construct message header - - cmsg := struct { - cmsghdr unix.Cmsghdr - pktinfo unix.Inet4Pktinfo - }{ - unix.Cmsghdr{ - Level: unix.IPPROTO_IP, - Type: unix.IP_PKTINFO, - Len: unix.SizeofInet4Pktinfo + unix.SizeofCmsghdr, - }, - unix.Inet4Pktinfo{ - Spec_dst: end.src4().Src, - Ifindex: end.src4().Ifindex, - }, - } - - end.mu.Lock() - _, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0) - end.mu.Unlock() - - if err == nil { - return nil - } - - // clear src and retry - - if err == unix.EINVAL { - end.ClearSrc() - cmsg.pktinfo = unix.Inet4Pktinfo{} - end.mu.Lock() - _, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0) - end.mu.Unlock() - } - - return err -} - -func send6(sock int, end *LinuxSocketEndpoint, buff []byte) error { - - // construct message header - - cmsg := struct { - cmsghdr unix.Cmsghdr - pktinfo unix.Inet6Pktinfo - }{ - unix.Cmsghdr{ - Level: unix.IPPROTO_IPV6, - Type: unix.IPV6_PKTINFO, - Len: unix.SizeofInet6Pktinfo + unix.SizeofCmsghdr, - }, - unix.Inet6Pktinfo{ - Addr: end.src6().src, - Ifindex: end.dst6().ZoneId, - }, - } - - if cmsg.pktinfo.Addr == [16]byte{} { - cmsg.pktinfo.Ifindex = 0 - } - - end.mu.Lock() - _, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0) - end.mu.Unlock() - - if err == nil { - return nil - } - - // clear src and retry - - if err == unix.EINVAL { - end.ClearSrc() - cmsg.pktinfo = unix.Inet6Pktinfo{} - end.mu.Lock() - _, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0) - end.mu.Unlock() - } - - return err -} - -func receive4(sock int, buff []byte, end *LinuxSocketEndpoint) (int, error) { - - // construct message header - - var cmsg struct { - cmsghdr unix.Cmsghdr - pktinfo unix.Inet4Pktinfo - } - - size, _, _, newDst, err := unix.Recvmsg(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], 0) - - if err != nil { - return 0, err - } - end.isV6 = false - - if newDst4, ok := newDst.(*unix.SockaddrInet4); ok { - *end.dst4() = *newDst4 - } - - // update source cache - - if cmsg.cmsghdr.Level == unix.IPPROTO_IP && - cmsg.cmsghdr.Type == unix.IP_PKTINFO && - cmsg.cmsghdr.Len >= unix.SizeofInet4Pktinfo { - end.src4().Src = cmsg.pktinfo.Spec_dst - end.src4().Ifindex = cmsg.pktinfo.Ifindex - } - - return size, nil -} - -func receive6(sock int, buff []byte, end *LinuxSocketEndpoint) (int, error) { - - // construct message header - - var cmsg struct { - cmsghdr unix.Cmsghdr - pktinfo unix.Inet6Pktinfo - } - - size, _, _, newDst, err := unix.Recvmsg(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], 0) - - if err != nil { - return 0, err - } - end.isV6 = true - - if newDst6, ok := newDst.(*unix.SockaddrInet6); ok { - *end.dst6() = *newDst6 - } - - // update source cache - - if cmsg.cmsghdr.Level == unix.IPPROTO_IPV6 && - cmsg.cmsghdr.Type == unix.IPV6_PKTINFO && - cmsg.cmsghdr.Len >= unix.SizeofInet6Pktinfo { - end.src6().src = cmsg.pktinfo.Addr - end.dst6().ZoneId = cmsg.pktinfo.Ifindex - } - - return size, nil -} diff --git a/conn/bind_std.go b/conn/bind_std.go index a3cbb15..46df7fd 100644 --- a/conn/bind_std.go +++ b/conn/bind_std.go @@ -1,79 +1,126 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn import ( + "context" "errors" + "fmt" "net" + "net/netip" + "runtime" + "strconv" "sync" "syscall" - "golang.zx2c4.com/go118/netip" + "golang.org/x/net/ipv4" + "golang.org/x/net/ipv6" ) -// StdNetBind is meant to be a temporary solution on platforms for which -// the sticky socket / source caching behavior has not yet been implemented. -// It uses the Go's net package to implement networking. -// See LinuxSocketBind for a proper implementation on the Linux platform. +var ( + _ Bind = (*StdNetBind)(nil) +) + +// StdNetBind implements Bind for all platforms. While Windows has its own Bind +// (see bind_windows.go), it may fall back to StdNetBind. +// TODO: Remove usage of ipv{4,6}.PacketConn when net.UDPConn has comparable +// methods for sending and receiving multiple datagrams per-syscall. See the +// proposal in https://github.com/golang/go/issues/45886#issuecomment-1218301564. type StdNetBind struct { - mu sync.Mutex // protects following fields - ipv4 *net.UDPConn - ipv6 *net.UDPConn + mu sync.Mutex // protects all fields except as specified + ipv4 *net.UDPConn + ipv6 *net.UDPConn + ipv4PC *ipv4.PacketConn // will be nil on non-Linux + ipv6PC *ipv6.PacketConn // will be nil on non-Linux + ipv4TxOffload bool + ipv4RxOffload bool + ipv6TxOffload bool + ipv6RxOffload bool + + // these two fields are not guarded by mu + udpAddrPool sync.Pool + msgsPool sync.Pool + blackhole4 bool blackhole6 bool } -func NewStdNetBind() Bind { return &StdNetBind{} } +func NewStdNetBind() Bind { + return &StdNetBind{ + udpAddrPool: sync.Pool{ + New: func() any { + return &net.UDPAddr{ + IP: make([]byte, 16), + } + }, + }, -type StdNetEndpoint net.UDPAddr + msgsPool: sync.Pool{ + New: func() any { + // ipv6.Message and ipv4.Message are interchangeable as they are + // both aliases for x/net/internal/socket.Message. + msgs := make([]ipv6.Message, IdealBatchSize) + for i := range msgs { + msgs[i].Buffers = make(net.Buffers, 1) + msgs[i].OOB = make([]byte, 0, stickyControlSize+gsoControlSize) + } + return &msgs + }, + }, + } +} -var _ Bind = (*StdNetBind)(nil) -var _ Endpoint = (*StdNetEndpoint)(nil) +type StdNetEndpoint struct { + // AddrPort is the endpoint destination. + netip.AddrPort + // src is the current sticky source address and interface index, if + // supported. Typically this is a PKTINFO structure from/for control + // messages, see unix.PKTINFO for an example. + src []byte +} + +var ( + _ Bind = (*StdNetBind)(nil) + _ Endpoint = &StdNetEndpoint{} +) func (*StdNetBind) ParseEndpoint(s string) (Endpoint, error) { e, err := netip.ParseAddrPort(s) - return (*StdNetEndpoint)(&net.UDPAddr{ - IP: e.Addr().AsSlice(), - Port: int(e.Port()), - Zone: e.Addr().Zone(), - }), err + if err != nil { + return nil, err + } + return &StdNetEndpoint{ + AddrPort: e, + }, nil } -func (*StdNetEndpoint) ClearSrc() {} +func (e *StdNetEndpoint) ClearSrc() { + if e.src != nil { + // Truncate src, no need to reallocate. + e.src = e.src[:0] + } +} func (e *StdNetEndpoint) DstIP() netip.Addr { - a, _ := netip.AddrFromSlice((*net.UDPAddr)(e).IP) - return a + return e.AddrPort.Addr() } -func (e *StdNetEndpoint) SrcIP() netip.Addr { - return netip.Addr{} // not supported -} +// See control_default,linux, etc for implementations of SrcIP and SrcIfidx. func (e *StdNetEndpoint) DstToBytes() []byte { - addr := (*net.UDPAddr)(e) - out := addr.IP.To4() - if out == nil { - out = addr.IP - } - out = append(out, byte(addr.Port&0xff)) - out = append(out, byte((addr.Port>>8)&0xff)) - return out + b, _ := e.AddrPort.MarshalBinary() + return b } func (e *StdNetEndpoint) DstToString() string { - return (*net.UDPAddr)(e).String() -} - -func (e *StdNetEndpoint) SrcToString() string { - return "" + return e.AddrPort.String() } func listenNet(network string, port int) (*net.UDPConn, int, error) { - conn, err := net.ListenUDP(network, &net.UDPAddr{Port: port}) + conn, err := listenConfig().ListenPacket(context.Background(), network, ":"+strconv.Itoa(port)) if err != nil { return nil, 0, err } @@ -87,17 +134,17 @@ func listenNet(network string, port int) (*net.UDPConn, int, error) { if err != nil { return nil, 0, err } - return conn, uaddr.Port, nil + return conn.(*net.UDPConn), uaddr.Port, nil } -func (bind *StdNetBind) Open(uport uint16) ([]ReceiveFunc, uint16, error) { - bind.mu.Lock() - defer bind.mu.Unlock() +func (s *StdNetBind) Open(uport uint16) ([]ReceiveFunc, uint16, error) { + s.mu.Lock() + defer s.mu.Unlock() var err error var tries int - if bind.ipv4 != nil || bind.ipv6 != nil { + if s.ipv4 != nil || s.ipv6 != nil { return nil, 0, ErrBindAlreadyOpen } @@ -105,92 +152,207 @@ func (bind *StdNetBind) Open(uport uint16) ([]ReceiveFunc, uint16, error) { // If uport is 0, we can retry on failure. again: port := int(uport) - var ipv4, ipv6 *net.UDPConn + var v4conn, v6conn *net.UDPConn + var v4pc *ipv4.PacketConn + var v6pc *ipv6.PacketConn - ipv4, port, err = listenNet("udp4", port) + v4conn, port, err = listenNet("udp4", port) if err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) { return nil, 0, err } // Listen on the same port as we're using for ipv4. - ipv6, port, err = listenNet("udp6", port) + v6conn, port, err = listenNet("udp6", port) if uport == 0 && errors.Is(err, syscall.EADDRINUSE) && tries < 100 { - ipv4.Close() + v4conn.Close() tries++ goto again } if err != nil && !errors.Is(err, syscall.EAFNOSUPPORT) { - ipv4.Close() + v4conn.Close() return nil, 0, err } var fns []ReceiveFunc - if ipv4 != nil { - fns = append(fns, bind.makeReceiveIPv4(ipv4)) - bind.ipv4 = ipv4 + if v4conn != nil { + s.ipv4TxOffload, s.ipv4RxOffload = supportsUDPOffload(v4conn) + if runtime.GOOS == "linux" || runtime.GOOS == "android" { + v4pc = ipv4.NewPacketConn(v4conn) + s.ipv4PC = v4pc + } + fns = append(fns, s.makeReceiveIPv4(v4pc, v4conn, s.ipv4RxOffload)) + s.ipv4 = v4conn } - if ipv6 != nil { - fns = append(fns, bind.makeReceiveIPv6(ipv6)) - bind.ipv6 = ipv6 + if v6conn != nil { + s.ipv6TxOffload, s.ipv6RxOffload = supportsUDPOffload(v6conn) + if runtime.GOOS == "linux" || runtime.GOOS == "android" { + v6pc = ipv6.NewPacketConn(v6conn) + s.ipv6PC = v6pc + } + fns = append(fns, s.makeReceiveIPv6(v6pc, v6conn, s.ipv6RxOffload)) + s.ipv6 = v6conn } if len(fns) == 0 { return nil, 0, syscall.EAFNOSUPPORT } + return fns, uint16(port), nil } -func (bind *StdNetBind) Close() error { - bind.mu.Lock() - defer bind.mu.Unlock() +func (s *StdNetBind) putMessages(msgs *[]ipv6.Message) { + for i := range *msgs { + (*msgs)[i].OOB = (*msgs)[i].OOB[:0] + (*msgs)[i] = ipv6.Message{Buffers: (*msgs)[i].Buffers, OOB: (*msgs)[i].OOB} + } + s.msgsPool.Put(msgs) +} + +func (s *StdNetBind) getMessages() *[]ipv6.Message { + return s.msgsPool.Get().(*[]ipv6.Message) +} + +var ( + // If compilation fails here these are no longer the same underlying type. + _ ipv6.Message = ipv4.Message{} +) + +type batchReader interface { + ReadBatch([]ipv6.Message, int) (int, error) +} + +type batchWriter interface { + WriteBatch([]ipv6.Message, int) (int, error) +} + +func (s *StdNetBind) receiveIP( + br batchReader, + conn *net.UDPConn, + rxOffload bool, + bufs [][]byte, + sizes []int, + eps []Endpoint, +) (n int, err error) { + msgs := s.getMessages() + for i := range bufs { + (*msgs)[i].Buffers[0] = bufs[i] + (*msgs)[i].OOB = (*msgs)[i].OOB[:cap((*msgs)[i].OOB)] + } + defer s.putMessages(msgs) + var numMsgs int + if runtime.GOOS == "linux" || runtime.GOOS == "android" { + if rxOffload { + readAt := len(*msgs) - (IdealBatchSize / udpSegmentMaxDatagrams) + numMsgs, err = br.ReadBatch((*msgs)[readAt:], 0) + if err != nil { + return 0, err + } + numMsgs, err = splitCoalescedMessages(*msgs, readAt, getGSOSize) + if err != nil { + return 0, err + } + } else { + numMsgs, err = br.ReadBatch(*msgs, 0) + if err != nil { + return 0, err + } + } + } else { + msg := &(*msgs)[0] + msg.N, msg.NN, _, msg.Addr, err = conn.ReadMsgUDP(msg.Buffers[0], msg.OOB) + if err != nil { + return 0, err + } + numMsgs = 1 + } + for i := 0; i < numMsgs; i++ { + msg := &(*msgs)[i] + sizes[i] = msg.N + if sizes[i] == 0 { + continue + } + addrPort := msg.Addr.(*net.UDPAddr).AddrPort() + ep := &StdNetEndpoint{AddrPort: addrPort} // TODO: remove allocation + getSrcFromControl(msg.OOB[:msg.NN], ep) + eps[i] = ep + } + return numMsgs, nil +} + +func (s *StdNetBind) makeReceiveIPv4(pc *ipv4.PacketConn, conn *net.UDPConn, rxOffload bool) ReceiveFunc { + return func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) { + return s.receiveIP(pc, conn, rxOffload, bufs, sizes, eps) + } +} + +func (s *StdNetBind) makeReceiveIPv6(pc *ipv6.PacketConn, conn *net.UDPConn, rxOffload bool) ReceiveFunc { + return func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) { + return s.receiveIP(pc, conn, rxOffload, bufs, sizes, eps) + } +} + +// TODO: When all Binds handle IdealBatchSize, remove this dynamic function and +// rename the IdealBatchSize constant to BatchSize. +func (s *StdNetBind) BatchSize() int { + if runtime.GOOS == "linux" || runtime.GOOS == "android" { + return IdealBatchSize + } + return 1 +} + +func (s *StdNetBind) Close() error { + s.mu.Lock() + defer s.mu.Unlock() var err1, err2 error - if bind.ipv4 != nil { - err1 = bind.ipv4.Close() - bind.ipv4 = nil + if s.ipv4 != nil { + err1 = s.ipv4.Close() + s.ipv4 = nil + s.ipv4PC = nil } - if bind.ipv6 != nil { - err2 = bind.ipv6.Close() - bind.ipv6 = nil + if s.ipv6 != nil { + err2 = s.ipv6.Close() + s.ipv6 = nil + s.ipv6PC = nil } - bind.blackhole4 = false - bind.blackhole6 = false + s.blackhole4 = false + s.blackhole6 = false + s.ipv4TxOffload = false + s.ipv4RxOffload = false + s.ipv6TxOffload = false + s.ipv6RxOffload = false if err1 != nil { return err1 } return err2 } -func (*StdNetBind) makeReceiveIPv4(conn *net.UDPConn) ReceiveFunc { - return func(buff []byte) (int, Endpoint, error) { - n, endpoint, err := conn.ReadFromUDP(buff) - if endpoint != nil { - endpoint.IP = endpoint.IP.To4() - } - return n, (*StdNetEndpoint)(endpoint), err - } +type ErrUDPGSODisabled struct { + onLaddr string + RetryErr error } -func (*StdNetBind) makeReceiveIPv6(conn *net.UDPConn) ReceiveFunc { - return func(buff []byte) (int, Endpoint, error) { - n, endpoint, err := conn.ReadFromUDP(buff) - return n, (*StdNetEndpoint)(endpoint), err - } +func (e ErrUDPGSODisabled) Error() string { + return fmt.Sprintf("disabled UDP GSO on %s, NIC(s) may not support checksum offload", e.onLaddr) } -func (bind *StdNetBind) Send(buff []byte, endpoint Endpoint) error { - var err error - nend, ok := endpoint.(*StdNetEndpoint) - if !ok { - return ErrWrongEndpointType - } +func (e ErrUDPGSODisabled) Unwrap() error { + return e.RetryErr +} - bind.mu.Lock() - blackhole := bind.blackhole4 - conn := bind.ipv4 - if nend.IP.To4() == nil { - blackhole = bind.blackhole6 - conn = bind.ipv6 +func (s *StdNetBind) Send(bufs [][]byte, endpoint Endpoint) error { + s.mu.Lock() + blackhole := s.blackhole4 + conn := s.ipv4 + offload := s.ipv4TxOffload + br := batchWriter(s.ipv4PC) + is6 := false + if endpoint.DstIP().Is6() { + blackhole = s.blackhole6 + conn = s.ipv6 + br = s.ipv6PC + is6 = true + offload = s.ipv6TxOffload } - bind.mu.Unlock() + s.mu.Unlock() if blackhole { return nil @@ -198,6 +360,185 @@ func (bind *StdNetBind) Send(buff []byte, endpoint Endpoint) error { if conn == nil { return syscall.EAFNOSUPPORT } - _, err = conn.WriteToUDP(buff, (*net.UDPAddr)(nend)) + + msgs := s.getMessages() + defer s.putMessages(msgs) + ua := s.udpAddrPool.Get().(*net.UDPAddr) + defer s.udpAddrPool.Put(ua) + if is6 { + as16 := endpoint.DstIP().As16() + copy(ua.IP, as16[:]) + ua.IP = ua.IP[:16] + } else { + as4 := endpoint.DstIP().As4() + copy(ua.IP, as4[:]) + ua.IP = ua.IP[:4] + } + ua.Port = int(endpoint.(*StdNetEndpoint).Port()) + var ( + retried bool + err error + ) +retry: + if offload { + n := coalesceMessages(ua, endpoint.(*StdNetEndpoint), bufs, *msgs, setGSOSize) + err = s.send(conn, br, (*msgs)[:n]) + if err != nil && offload && errShouldDisableUDPGSO(err) { + offload = false + s.mu.Lock() + if is6 { + s.ipv6TxOffload = false + } else { + s.ipv4TxOffload = false + } + s.mu.Unlock() + retried = true + goto retry + } + } else { + for i := range bufs { + (*msgs)[i].Addr = ua + (*msgs)[i].Buffers[0] = bufs[i] + setSrcControl(&(*msgs)[i].OOB, endpoint.(*StdNetEndpoint)) + } + err = s.send(conn, br, (*msgs)[:len(bufs)]) + } + if retried { + return ErrUDPGSODisabled{onLaddr: conn.LocalAddr().String(), RetryErr: err} + } + return err +} + +func (s *StdNetBind) send(conn *net.UDPConn, pc batchWriter, msgs []ipv6.Message) error { + var ( + n int + err error + start int + ) + if runtime.GOOS == "linux" || runtime.GOOS == "android" { + for { + n, err = pc.WriteBatch(msgs[start:], 0) + if err != nil || n == len(msgs[start:]) { + break + } + start += n + } + } else { + for _, msg := range msgs { + _, _, err = conn.WriteMsgUDP(msg.Buffers[0], msg.OOB, msg.Addr.(*net.UDPAddr)) + if err != nil { + break + } + } + } return err } + +const ( + // Exceeding these values results in EMSGSIZE. They account for layer3 and + // layer4 headers. IPv6 does not need to account for itself as the payload + // length field is self excluding. + maxIPv4PayloadLen = 1<<16 - 1 - 20 - 8 + maxIPv6PayloadLen = 1<<16 - 1 - 8 + + // This is a hard limit imposed by the kernel. + udpSegmentMaxDatagrams = 64 +) + +type setGSOFunc func(control *[]byte, gsoSize uint16) + +func coalesceMessages(addr *net.UDPAddr, ep *StdNetEndpoint, bufs [][]byte, msgs []ipv6.Message, setGSO setGSOFunc) int { + var ( + base = -1 // index of msg we are currently coalescing into + gsoSize int // segmentation size of msgs[base] + dgramCnt int // number of dgrams coalesced into msgs[base] + endBatch bool // tracking flag to start a new batch on next iteration of bufs + ) + maxPayloadLen := maxIPv4PayloadLen + if ep.DstIP().Is6() { + maxPayloadLen = maxIPv6PayloadLen + } + for i, buf := range bufs { + if i > 0 { + msgLen := len(buf) + baseLenBefore := len(msgs[base].Buffers[0]) + freeBaseCap := cap(msgs[base].Buffers[0]) - baseLenBefore + if msgLen+baseLenBefore <= maxPayloadLen && + msgLen <= gsoSize && + msgLen <= freeBaseCap && + dgramCnt < udpSegmentMaxDatagrams && + !endBatch { + msgs[base].Buffers[0] = append(msgs[base].Buffers[0], buf...) + if i == len(bufs)-1 { + setGSO(&msgs[base].OOB, uint16(gsoSize)) + } + dgramCnt++ + if msgLen < gsoSize { + // A smaller than gsoSize packet on the tail is legal, but + // it must end the batch. + endBatch = true + } + continue + } + } + if dgramCnt > 1 { + setGSO(&msgs[base].OOB, uint16(gsoSize)) + } + // Reset prior to incrementing base since we are preparing to start a + // new potential batch. + endBatch = false + base++ + gsoSize = len(buf) + setSrcControl(&msgs[base].OOB, ep) + msgs[base].Buffers[0] = buf + msgs[base].Addr = addr + dgramCnt = 1 + } + return base + 1 +} + +type getGSOFunc func(control []byte) (int, error) + +func splitCoalescedMessages(msgs []ipv6.Message, firstMsgAt int, getGSO getGSOFunc) (n int, err error) { + for i := firstMsgAt; i < len(msgs); i++ { + msg := &msgs[i] + if msg.N == 0 { + return n, err + } + var ( + gsoSize int + start int + end = msg.N + numToSplit = 1 + ) + gsoSize, err = getGSO(msg.OOB[:msg.NN]) + if err != nil { + return n, err + } + if gsoSize > 0 { + numToSplit = (msg.N + gsoSize - 1) / gsoSize + end = gsoSize + } + for j := 0; j < numToSplit; j++ { + if n > i { + return n, errors.New("splitting coalesced packet resulted in overflow") + } + copied := copy(msgs[n].Buffers[0], msg.Buffers[0][start:end]) + msgs[n].N = copied + msgs[n].Addr = msg.Addr + start = end + end += gsoSize + if end > msg.N { + end = msg.N + } + n++ + } + if i != n-1 { + // It is legal for bytes to move within msg.Buffers[0] as a result + // of splitting, so we only zero the source msg len when it is not + // the destination of the last split operation above. + msg.N = 0 + } + } + return n, nil +} diff --git a/conn/bind_std_test.go b/conn/bind_std_test.go new file mode 100644 index 0000000..34a3c9a --- /dev/null +++ b/conn/bind_std_test.go @@ -0,0 +1,250 @@ +package conn + +import ( + "encoding/binary" + "net" + "testing" + + "golang.org/x/net/ipv6" +) + +func TestStdNetBindReceiveFuncAfterClose(t *testing.T) { + bind := NewStdNetBind().(*StdNetBind) + fns, _, err := bind.Open(0) + if err != nil { + t.Fatal(err) + } + bind.Close() + bufs := make([][]byte, 1) + bufs[0] = make([]byte, 1) + sizes := make([]int, 1) + eps := make([]Endpoint, 1) + for _, fn := range fns { + // The ReceiveFuncs must not access conn-related fields on StdNetBind + // unguarded. Close() nils the conn-related fields resulting in a panic + // if they violate the mutex. + fn(bufs, sizes, eps) + } +} + +func mockSetGSOSize(control *[]byte, gsoSize uint16) { + *control = (*control)[:cap(*control)] + binary.LittleEndian.PutUint16(*control, gsoSize) +} + +func Test_coalesceMessages(t *testing.T) { + cases := []struct { + name string + buffs [][]byte + wantLens []int + wantGSO []int + }{ + { + name: "one message no coalesce", + buffs: [][]byte{ + make([]byte, 1, 1), + }, + wantLens: []int{1}, + wantGSO: []int{0}, + }, + { + name: "two messages equal len coalesce", + buffs: [][]byte{ + make([]byte, 1, 2), + make([]byte, 1, 1), + }, + wantLens: []int{2}, + wantGSO: []int{1}, + }, + { + name: "two messages unequal len coalesce", + buffs: [][]byte{ + make([]byte, 2, 3), + make([]byte, 1, 1), + }, + wantLens: []int{3}, + wantGSO: []int{2}, + }, + { + name: "three messages second unequal len coalesce", + buffs: [][]byte{ + make([]byte, 2, 3), + make([]byte, 1, 1), + make([]byte, 2, 2), + }, + wantLens: []int{3, 2}, + wantGSO: []int{2, 0}, + }, + { + name: "three messages limited cap coalesce", + buffs: [][]byte{ + make([]byte, 2, 4), + make([]byte, 2, 2), + make([]byte, 2, 2), + }, + wantLens: []int{4, 2}, + wantGSO: []int{2, 0}, + }, + } + + for _, tt := range cases { + t.Run(tt.name, func(t *testing.T) { + addr := &net.UDPAddr{ + IP: net.ParseIP("127.0.0.1").To4(), + Port: 1, + } + msgs := make([]ipv6.Message, len(tt.buffs)) + for i := range msgs { + msgs[i].Buffers = make([][]byte, 1) + msgs[i].OOB = make([]byte, 0, 2) + } + got := coalesceMessages(addr, &StdNetEndpoint{AddrPort: addr.AddrPort()}, tt.buffs, msgs, mockSetGSOSize) + if got != len(tt.wantLens) { + t.Fatalf("got len %d want: %d", got, len(tt.wantLens)) + } + for i := 0; i < got; i++ { + if msgs[i].Addr != addr { + t.Errorf("msgs[%d].Addr != passed addr", i) + } + gotLen := len(msgs[i].Buffers[0]) + if gotLen != tt.wantLens[i] { + t.Errorf("len(msgs[%d].Buffers[0]) %d != %d", i, gotLen, tt.wantLens[i]) + } + gotGSO, err := mockGetGSOSize(msgs[i].OOB) + if err != nil { + t.Fatalf("msgs[%d] getGSOSize err: %v", i, err) + } + if gotGSO != tt.wantGSO[i] { + t.Errorf("msgs[%d] gsoSize %d != %d", i, gotGSO, tt.wantGSO[i]) + } + } + }) + } +} + +func mockGetGSOSize(control []byte) (int, error) { + if len(control) < 2 { + return 0, nil + } + return int(binary.LittleEndian.Uint16(control)), nil +} + +func Test_splitCoalescedMessages(t *testing.T) { + newMsg := func(n, gso int) ipv6.Message { + msg := ipv6.Message{ + Buffers: [][]byte{make([]byte, 1<<16-1)}, + N: n, + OOB: make([]byte, 2), + } + binary.LittleEndian.PutUint16(msg.OOB, uint16(gso)) + if gso > 0 { + msg.NN = 2 + } + return msg + } + + cases := []struct { + name string + msgs []ipv6.Message + firstMsgAt int + wantNumEval int + wantMsgLens []int + wantErr bool + }{ + { + name: "second last split last empty", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(3, 1), + newMsg(0, 0), + }, + firstMsgAt: 2, + wantNumEval: 3, + wantMsgLens: []int{1, 1, 1, 0}, + wantErr: false, + }, + { + name: "second last no split last empty", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(1, 0), + newMsg(0, 0), + }, + firstMsgAt: 2, + wantNumEval: 1, + wantMsgLens: []int{1, 0, 0, 0}, + wantErr: false, + }, + { + name: "second last no split last no split", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(1, 0), + newMsg(1, 0), + }, + firstMsgAt: 2, + wantNumEval: 2, + wantMsgLens: []int{1, 1, 0, 0}, + wantErr: false, + }, + { + name: "second last no split last split", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(1, 0), + newMsg(3, 1), + }, + firstMsgAt: 2, + wantNumEval: 4, + wantMsgLens: []int{1, 1, 1, 1}, + wantErr: false, + }, + { + name: "second last split last split", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(2, 1), + newMsg(2, 1), + }, + firstMsgAt: 2, + wantNumEval: 4, + wantMsgLens: []int{1, 1, 1, 1}, + wantErr: false, + }, + { + name: "second last no split last split overflow", + msgs: []ipv6.Message{ + newMsg(0, 0), + newMsg(0, 0), + newMsg(1, 0), + newMsg(4, 1), + }, + firstMsgAt: 2, + wantNumEval: 4, + wantMsgLens: []int{1, 1, 1, 1}, + wantErr: true, + }, + } + + for _, tt := range cases { + t.Run(tt.name, func(t *testing.T) { + got, err := splitCoalescedMessages(tt.msgs, 2, mockGetGSOSize) + if err != nil && !tt.wantErr { + t.Fatalf("err: %v", err) + } + if got != tt.wantNumEval { + t.Fatalf("got to eval: %d want: %d", got, tt.wantNumEval) + } + for i, msg := range tt.msgs { + if msg.N != tt.wantMsgLens[i] { + t.Fatalf("msg[%d].N: %d want: %d", i, msg.N, tt.wantMsgLens[i]) + } + } + }) + } +} diff --git a/conn/bind_windows.go b/conn/bind_windows.go index 26a3af8..d5095e0 100644 --- a/conn/bind_windows.go +++ b/conn/bind_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn @@ -9,13 +9,13 @@ import ( "encoding/binary" "io" "net" + "net/netip" "strconv" "sync" "sync/atomic" "unsafe" "golang.org/x/sys/windows" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/conn/winrio" ) @@ -74,7 +74,7 @@ type afWinRingBind struct { type WinRingBind struct { v4, v6 afWinRingBind mu sync.RWMutex - isOpen uint32 + isOpen atomic.Uint32 // 0, 1, or 2 } func NewDefaultBind() Bind { return NewWinRingBind() } @@ -91,8 +91,10 @@ type WinRingEndpoint struct { data [30]byte } -var _ Bind = (*WinRingBind)(nil) -var _ Endpoint = (*WinRingEndpoint)(nil) +var ( + _ Bind = (*WinRingBind)(nil) + _ Endpoint = (*WinRingEndpoint)(nil) +) func (*WinRingBind) ParseEndpoint(s string) (Endpoint, error) { host, port, err := net.SplitHostPort(s) @@ -162,7 +164,7 @@ func (e *WinRingEndpoint) DstToBytes() []byte { func (e *WinRingEndpoint) DstToString() string { switch e.family { case windows.AF_INET: - netip.AddrPortFrom(netip.AddrFrom4(*(*[4]byte)(e.data[2:6])), binary.BigEndian.Uint16(e.data[0:2])).String() + return netip.AddrPortFrom(netip.AddrFrom4(*(*[4]byte)(e.data[2:6])), binary.BigEndian.Uint16(e.data[0:2])).String() case windows.AF_INET6: var zone string if scope := *(*uint32)(unsafe.Pointer(&e.data[22])); scope > 0 { @@ -210,7 +212,7 @@ func (bind *afWinRingBind) CloseAndZero() { } func (bind *WinRingBind) closeAndZero() { - atomic.StoreUint32(&bind.isOpen, 0) + bind.isOpen.Store(0) bind.v4.CloseAndZero() bind.v6.CloseAndZero() } @@ -274,7 +276,7 @@ func (bind *WinRingBind) Open(port uint16) (recvFns []ReceiveFunc, selectedPort bind.closeAndZero() } }() - if atomic.LoadUint32(&bind.isOpen) != 0 { + if bind.isOpen.Load() != 0 { return nil, 0, ErrBindAlreadyOpen } var sa windows.Sockaddr @@ -297,17 +299,17 @@ func (bind *WinRingBind) Open(port uint16) (recvFns []ReceiveFunc, selectedPort return nil, 0, err } } - atomic.StoreUint32(&bind.isOpen, 1) + bind.isOpen.Store(1) return []ReceiveFunc{bind.receiveIPv4, bind.receiveIPv6}, selectedPort, err } func (bind *WinRingBind) Close() error { bind.mu.RLock() - if atomic.LoadUint32(&bind.isOpen) != 1 { + if bind.isOpen.Load() != 1 { bind.mu.RUnlock() return nil } - atomic.StoreUint32(&bind.isOpen, 2) + bind.isOpen.Store(2) windows.PostQueuedCompletionStatus(bind.v4.rx.iocp, 0, 0, nil) windows.PostQueuedCompletionStatus(bind.v4.tx.iocp, 0, 0, nil) windows.PostQueuedCompletionStatus(bind.v6.rx.iocp, 0, 0, nil) @@ -319,6 +321,13 @@ func (bind *WinRingBind) Close() error { return nil } +// TODO: When all Binds handle IdealBatchSize, remove this dynamic function and +// rename the IdealBatchSize constant to BatchSize. +func (bind *WinRingBind) BatchSize() int { + // TODO: implement batching in and out of the ring + return 1 +} + func (bind *WinRingBind) SetMark(mark uint32) error { return nil } @@ -343,8 +352,8 @@ func (bind *afWinRingBind) InsertReceiveRequest() error { //go:linkname procyield runtime.procyield func procyield(cycles uint32) -func (bind *afWinRingBind) Receive(buf []byte, isOpen *uint32) (int, Endpoint, error) { - if atomic.LoadUint32(isOpen) != 1 { +func (bind *afWinRingBind) Receive(buf []byte, isOpen *atomic.Uint32) (int, Endpoint, error) { + if isOpen.Load() != 1 { return 0, nil, net.ErrClosed } bind.rx.mu.Lock() @@ -357,7 +366,7 @@ retry: count = 0 for tries := 0; count == 0 && tries < receiveSpins; tries++ { if tries > 0 { - if atomic.LoadUint32(isOpen) != 1 { + if isOpen.Load() != 1 { return 0, nil, net.ErrClosed } procyield(1) @@ -376,13 +385,12 @@ retry: if err != nil { return 0, nil, err } - if atomic.LoadUint32(isOpen) != 1 { + if isOpen.Load() != 1 { return 0, nil, net.ErrClosed } count = winrio.DequeueCompletion(bind.rx.cq, results[:]) if count == 0 { return 0, nil, io.ErrNoProgress - } } bind.rx.Return(1) @@ -394,7 +402,7 @@ retry: // huge packets. Just try again when this happens. The infinite loop this could cause is still limited to // attacker bandwidth, just like the rest of the receive path. if windows.Errno(results[0].Status) == windows.WSAEMSGSIZE { - if atomic.LoadUint32(isOpen) != 1 { + if isOpen.Load() != 1 { return 0, nil, net.ErrClosed } goto retry @@ -408,20 +416,26 @@ retry: return n, &ep, nil } -func (bind *WinRingBind) receiveIPv4(buf []byte) (int, Endpoint, error) { +func (bind *WinRingBind) receiveIPv4(bufs [][]byte, sizes []int, eps []Endpoint) (int, error) { bind.mu.RLock() defer bind.mu.RUnlock() - return bind.v4.Receive(buf, &bind.isOpen) + n, ep, err := bind.v4.Receive(bufs[0], &bind.isOpen) + sizes[0] = n + eps[0] = ep + return 1, err } -func (bind *WinRingBind) receiveIPv6(buf []byte) (int, Endpoint, error) { +func (bind *WinRingBind) receiveIPv6(bufs [][]byte, sizes []int, eps []Endpoint) (int, error) { bind.mu.RLock() defer bind.mu.RUnlock() - return bind.v6.Receive(buf, &bind.isOpen) + n, ep, err := bind.v6.Receive(bufs[0], &bind.isOpen) + sizes[0] = n + eps[0] = ep + return 1, err } -func (bind *afWinRingBind) Send(buf []byte, nend *WinRingEndpoint, isOpen *uint32) error { - if atomic.LoadUint32(isOpen) != 1 { +func (bind *afWinRingBind) Send(buf []byte, nend *WinRingEndpoint, isOpen *atomic.Uint32) error { + if isOpen.Load() != 1 { return net.ErrClosed } if len(buf) > bytesPerPacket { @@ -443,7 +457,7 @@ func (bind *afWinRingBind) Send(buf []byte, nend *WinRingEndpoint, isOpen *uint3 if err != nil { return err } - if atomic.LoadUint32(isOpen) != 1 { + if isOpen.Load() != 1 { return net.ErrClosed } count = winrio.DequeueCompletion(bind.tx.cq, results[:]) @@ -472,32 +486,38 @@ func (bind *afWinRingBind) Send(buf []byte, nend *WinRingEndpoint, isOpen *uint3 return winrio.SendEx(bind.rq, dataBuffer, 1, nil, addressBuffer, nil, nil, 0, 0) } -func (bind *WinRingBind) Send(buf []byte, endpoint Endpoint) error { +func (bind *WinRingBind) Send(bufs [][]byte, endpoint Endpoint) error { nend, ok := endpoint.(*WinRingEndpoint) if !ok { return ErrWrongEndpointType } bind.mu.RLock() defer bind.mu.RUnlock() - switch nend.family { - case windows.AF_INET: - if bind.v4.blackhole { - return nil - } - return bind.v4.Send(buf, nend, &bind.isOpen) - case windows.AF_INET6: - if bind.v6.blackhole { - return nil + for _, buf := range bufs { + switch nend.family { + case windows.AF_INET: + if bind.v4.blackhole { + continue + } + if err := bind.v4.Send(buf, nend, &bind.isOpen); err != nil { + return err + } + case windows.AF_INET6: + if bind.v6.blackhole { + continue + } + if err := bind.v6.Send(buf, nend, &bind.isOpen); err != nil { + return err + } } - return bind.v6.Send(buf, nend, &bind.isOpen) } return nil } -func (bind *StdNetBind) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error { - bind.mu.Lock() - defer bind.mu.Unlock() - sysconn, err := bind.ipv4.SyscallConn() +func (s *StdNetBind) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error { + s.mu.Lock() + defer s.mu.Unlock() + sysconn, err := s.ipv4.SyscallConn() if err != nil { return err } @@ -510,14 +530,14 @@ func (bind *StdNetBind) BindSocketToInterface4(interfaceIndex uint32, blackhole if err != nil { return err } - bind.blackhole4 = blackhole + s.blackhole4 = blackhole return nil } -func (bind *StdNetBind) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error { - bind.mu.Lock() - defer bind.mu.Unlock() - sysconn, err := bind.ipv6.SyscallConn() +func (s *StdNetBind) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error { + s.mu.Lock() + defer s.mu.Unlock() + sysconn, err := s.ipv6.SyscallConn() if err != nil { return err } @@ -530,13 +550,14 @@ func (bind *StdNetBind) BindSocketToInterface6(interfaceIndex uint32, blackhole if err != nil { return err } - bind.blackhole6 = blackhole + s.blackhole6 = blackhole return nil } + func (bind *WinRingBind) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error { bind.mu.RLock() defer bind.mu.RUnlock() - if atomic.LoadUint32(&bind.isOpen) != 1 { + if bind.isOpen.Load() != 1 { return net.ErrClosed } err := bindSocketToInterface4(bind.v4.sock, interfaceIndex) @@ -550,7 +571,7 @@ func (bind *WinRingBind) BindSocketToInterface4(interfaceIndex uint32, blackhole func (bind *WinRingBind) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error { bind.mu.RLock() defer bind.mu.RUnlock() - if atomic.LoadUint32(&bind.isOpen) != 1 { + if bind.isOpen.Load() != 1 { return net.ErrClosed } err := bindSocketToInterface6(bind.v6.sock, interfaceIndex) diff --git a/conn/bindtest/bindtest.go b/conn/bindtest/bindtest.go index 6a45896..74e7add 100644 --- a/conn/bindtest/bindtest.go +++ b/conn/bindtest/bindtest.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package bindtest @@ -9,9 +9,9 @@ import ( "fmt" "math/rand" "net" + "net/netip" "os" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/conn" ) @@ -25,8 +25,10 @@ type ChannelBind struct { type ChannelEndpoint uint16 -var _ conn.Bind = (*ChannelBind)(nil) -var _ conn.Endpoint = (*ChannelEndpoint)(nil) +var ( + _ conn.Bind = (*ChannelBind)(nil) + _ conn.Endpoint = (*ChannelEndpoint)(nil) +) func NewChannelBinds() [2]conn.Bind { arx4 := make(chan []byte, 8192) @@ -87,32 +89,39 @@ func (c *ChannelBind) Close() error { return nil } +func (c *ChannelBind) BatchSize() int { return 1 } + func (c *ChannelBind) SetMark(mark uint32) error { return nil } func (c *ChannelBind) makeReceiveFunc(ch chan []byte) conn.ReceiveFunc { - return func(b []byte) (n int, ep conn.Endpoint, err error) { + return func(bufs [][]byte, sizes []int, eps []conn.Endpoint) (n int, err error) { select { case <-c.closeSignal: - return 0, nil, net.ErrClosed + return 0, net.ErrClosed case rx := <-ch: - return copy(b, rx), c.target6, nil + copied := copy(bufs[0], rx) + sizes[0] = copied + eps[0] = c.target6 + return 1, nil } } } -func (c *ChannelBind) Send(b []byte, ep conn.Endpoint) error { - select { - case <-c.closeSignal: - return net.ErrClosed - default: - bc := make([]byte, len(b)) - copy(bc, b) - if ep.(ChannelEndpoint) == c.target4 { - *c.tx4 <- bc - } else if ep.(ChannelEndpoint) == c.target6 { - *c.tx6 <- bc - } else { - return os.ErrInvalid +func (c *ChannelBind) Send(bufs [][]byte, ep conn.Endpoint) error { + for _, b := range bufs { + select { + case <-c.closeSignal: + return net.ErrClosed + default: + bc := make([]byte, len(b)) + copy(bc, b) + if ep.(ChannelEndpoint) == c.target4 { + *c.tx4 <- bc + } else if ep.(ChannelEndpoint) == c.target6 { + *c.tx6 <- bc + } else { + return os.ErrInvalid + } } } return nil diff --git a/conn/boundif_android.go b/conn/boundif_android.go index 8b82bfc..dd3ca5b 100644 --- a/conn/boundif_android.go +++ b/conn/boundif_android.go @@ -1,12 +1,12 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn -func (bind *StdNetBind) PeekLookAtSocketFd4() (fd int, err error) { - sysconn, err := bind.ipv4.SyscallConn() +func (s *StdNetBind) PeekLookAtSocketFd4() (fd int, err error) { + sysconn, err := s.ipv4.SyscallConn() if err != nil { return -1, err } @@ -19,8 +19,8 @@ func (bind *StdNetBind) PeekLookAtSocketFd4() (fd int, err error) { return } -func (bind *StdNetBind) PeekLookAtSocketFd6() (fd int, err error) { - sysconn, err := bind.ipv6.SyscallConn() +func (s *StdNetBind) PeekLookAtSocketFd6() (fd int, err error) { + sysconn, err := s.ipv6.SyscallConn() if err != nil { return -1, err } diff --git a/conn/conn.go b/conn/conn.go index 35fb6b1..a1f57d2 100644 --- a/conn/conn.go +++ b/conn/conn.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ // Package conn implements WireGuard's network connections. @@ -9,17 +9,23 @@ package conn import ( "errors" "fmt" + "net/netip" "reflect" "runtime" "strings" +) - "golang.zx2c4.com/go118/netip" +const ( + IdealBatchSize = 128 // maximum number of packets handled per read and write ) -// A ReceiveFunc receives a single inbound packet from the network. -// It writes the data into b. n is the length of the packet. -// ep is the remote endpoint. -type ReceiveFunc func(b []byte) (n int, ep Endpoint, err error) +// A ReceiveFunc receives at least one packet from the network and writes them +// into packets. On a successful read it returns the number of elements of +// sizes, packets, and endpoints that should be evaluated. Some elements of +// sizes may be zero, and callers should ignore them. Callers must pass a sizes +// and eps slice with a length greater than or equal to the length of packets. +// These lengths must not exceed the length of the associated Bind.BatchSize(). +type ReceiveFunc func(packets [][]byte, sizes []int, eps []Endpoint) (n int, err error) // A Bind listens on a port for both IPv6 and IPv4 UDP traffic. // @@ -39,11 +45,16 @@ type Bind interface { // This mark is passed to the kernel as the socket option SO_MARK. SetMark(mark uint32) error - // Send writes a packet b to address ep. - Send(b []byte, ep Endpoint) error + // Send writes one or more packets in bufs to address ep. The length of + // bufs must not exceed BatchSize(). + Send(bufs [][]byte, ep Endpoint) error // ParseEndpoint creates a new endpoint from a string. ParseEndpoint(s string) (Endpoint, error) + + // BatchSize is the number of buffers expected to be passed to + // the ReceiveFuncs, and the maximum expected to be passed to SendBatch. + BatchSize() int } // BindSocketToInterface is implemented by Bind objects that support being diff --git a/conn/conn_test.go b/conn/conn_test.go new file mode 100644 index 0000000..c6194ee --- /dev/null +++ b/conn/conn_test.go @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "testing" +) + +func TestPrettyName(t *testing.T) { + var ( + recvFunc ReceiveFunc = func(bufs [][]byte, sizes []int, eps []Endpoint) (n int, err error) { return } + ) + + const want = "TestPrettyName" + + t.Run("ReceiveFunc.PrettyName", func(t *testing.T) { + if got := recvFunc.PrettyName(); got != want { + t.Errorf("PrettyName() = %v, want %v", got, want) + } + }) +} diff --git a/conn/controlfns.go b/conn/controlfns.go new file mode 100644 index 0000000..4f7d90f --- /dev/null +++ b/conn/controlfns.go @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "net" + "syscall" +) + +// UDP socket read/write buffer size (7MB). The value of 7MB is chosen as it is +// the max supported by a default configuration of macOS. Some platforms will +// silently clamp the value to other maximums, such as linux clamping to +// net.core.{r,w}mem_max (see _linux.go for additional implementation that works +// around this limitation) +const socketBufferSize = 7 << 20 + +// controlFn is the callback function signature from net.ListenConfig.Control. +// It is used to apply platform specific configuration to the socket prior to +// bind. +type controlFn func(network, address string, c syscall.RawConn) error + +// controlFns is a list of functions that are called from the listen config +// that can apply socket options. +var controlFns = []controlFn{} + +// listenConfig returns a net.ListenConfig that applies the controlFns to the +// socket prior to bind. This is used to apply socket buffer sizing and packet +// information OOB configuration for sticky sockets. +func listenConfig() *net.ListenConfig { + return &net.ListenConfig{ + Control: func(network, address string, c syscall.RawConn) error { + for _, fn := range controlFns { + if err := fn(network, address, c); err != nil { + return err + } + } + return nil + }, + } +} diff --git a/conn/controlfns_linux.go b/conn/controlfns_linux.go new file mode 100644 index 0000000..f6ab1d2 --- /dev/null +++ b/conn/controlfns_linux.go @@ -0,0 +1,69 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "fmt" + "runtime" + "syscall" + + "golang.org/x/sys/unix" +) + +func init() { + controlFns = append(controlFns, + + // Attempt to set the socket buffer size beyond net.core.{r,w}mem_max by + // using SO_*BUFFORCE. This requires CAP_NET_ADMIN, and is allowed here to + // fail silently - the result of failure is lower performance on very fast + // links or high latency links. + func(network, address string, c syscall.RawConn) error { + return c.Control(func(fd uintptr) { + // Set up to *mem_max + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_RCVBUF, socketBufferSize) + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_SNDBUF, socketBufferSize) + // Set beyond *mem_max if CAP_NET_ADMIN + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_RCVBUFFORCE, socketBufferSize) + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_SNDBUFFORCE, socketBufferSize) + }) + }, + + // Enable receiving of the packet information (IP_PKTINFO for IPv4, + // IPV6_PKTINFO for IPv6) that is used to implement sticky socket support. + func(network, address string, c syscall.RawConn) error { + var err error + switch network { + case "udp4": + if runtime.GOOS != "android" { + c.Control(func(fd uintptr) { + err = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_PKTINFO, 1) + }) + } + case "udp6": + c.Control(func(fd uintptr) { + if runtime.GOOS != "android" { + err = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_RECVPKTINFO, 1) + if err != nil { + return + } + } + err = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_V6ONLY, 1) + }) + default: + err = fmt.Errorf("unhandled network: %s: %w", network, unix.EINVAL) + } + return err + }, + + // Attempt to enable UDP_GRO + func(network, address string, c syscall.RawConn) error { + c.Control(func(fd uintptr) { + _ = unix.SetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO, 1) + }) + return nil + }, + ) +} diff --git a/conn/controlfns_unix.go b/conn/controlfns_unix.go new file mode 100644 index 0000000..91692c0 --- /dev/null +++ b/conn/controlfns_unix.go @@ -0,0 +1,35 @@ +//go:build !windows && !linux && !wasm + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "syscall" + + "golang.org/x/sys/unix" +) + +func init() { + controlFns = append(controlFns, + func(network, address string, c syscall.RawConn) error { + return c.Control(func(fd uintptr) { + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_RCVBUF, socketBufferSize) + _ = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_SNDBUF, socketBufferSize) + }) + }, + + func(network, address string, c syscall.RawConn) error { + var err error + if network == "udp6" { + c.Control(func(fd uintptr) { + err = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_V6ONLY, 1) + }) + } + return err + }, + ) +} diff --git a/conn/controlfns_windows.go b/conn/controlfns_windows.go new file mode 100644 index 0000000..c3bdf7d --- /dev/null +++ b/conn/controlfns_windows.go @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "syscall" + + "golang.org/x/sys/windows" +) + +func init() { + controlFns = append(controlFns, + func(network, address string, c syscall.RawConn) error { + return c.Control(func(fd uintptr) { + _ = windows.SetsockoptInt(windows.Handle(fd), windows.SOL_SOCKET, windows.SO_RCVBUF, socketBufferSize) + _ = windows.SetsockoptInt(windows.Handle(fd), windows.SOL_SOCKET, windows.SO_SNDBUF, socketBufferSize) + }) + }, + ) +} diff --git a/conn/default.go b/conn/default.go index e65bb74..b6f761b 100644 --- a/conn/default.go +++ b/conn/default.go @@ -1,8 +1,8 @@ -//go:build !linux && !windows +//go:build !windows /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn diff --git a/conn/errors_default.go b/conn/errors_default.go new file mode 100644 index 0000000..f1e5b90 --- /dev/null +++ b/conn/errors_default.go @@ -0,0 +1,12 @@ +//go:build !linux + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +func errShouldDisableUDPGSO(err error) bool { + return false +} diff --git a/conn/errors_linux.go b/conn/errors_linux.go new file mode 100644 index 0000000..8e61000 --- /dev/null +++ b/conn/errors_linux.go @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "errors" + "os" + + "golang.org/x/sys/unix" +) + +func errShouldDisableUDPGSO(err error) bool { + var serr *os.SyscallError + if errors.As(err, &serr) { + // EIO is returned by udp_send_skb() if the device driver does not have + // tx checksumming enabled, which is a hard requirement of UDP_SEGMENT. + // See: + // https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/man7/udp.7?id=806eabd74910447f21005160e90957bde4db0183#n228 + // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/udp.c?h=v6.2&id=c9c3395d5e3dcc6daee66c6908354d47bf98cb0c#n942 + return serr.Err == unix.EIO + } + return false +} diff --git a/conn/features_default.go b/conn/features_default.go new file mode 100644 index 0000000..d53ff5f --- /dev/null +++ b/conn/features_default.go @@ -0,0 +1,15 @@ +//go:build !linux +// +build !linux + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import "net" + +func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) { + return +} diff --git a/conn/features_linux.go b/conn/features_linux.go new file mode 100644 index 0000000..8959d93 --- /dev/null +++ b/conn/features_linux.go @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "net" + + "golang.org/x/sys/unix" +) + +func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) { + rc, err := conn.SyscallConn() + if err != nil { + return + } + err = rc.Control(func(fd uintptr) { + _, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT) + txOffload = errSyscall == nil + opt, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO) + rxOffload = errSyscall == nil && opt == 1 + }) + if err != nil { + return false, false + } + return txOffload, rxOffload +} diff --git a/conn/gso_default.go b/conn/gso_default.go new file mode 100644 index 0000000..57780db --- /dev/null +++ b/conn/gso_default.go @@ -0,0 +1,21 @@ +//go:build !linux + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +// getGSOSize parses control for UDP_GRO and if found returns its GSO size data. +func getGSOSize(control []byte) (int, error) { + return 0, nil +} + +// setGSOSize sets a UDP_SEGMENT in control based on gsoSize. +func setGSOSize(control *[]byte, gsoSize uint16) { +} + +// gsoControlSize returns the recommended buffer size for pooling sticky and UDP +// offloading control data. +const gsoControlSize = 0 diff --git a/conn/gso_linux.go b/conn/gso_linux.go new file mode 100644 index 0000000..8596b29 --- /dev/null +++ b/conn/gso_linux.go @@ -0,0 +1,65 @@ +//go:build linux + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "fmt" + "unsafe" + + "golang.org/x/sys/unix" +) + +const ( + sizeOfGSOData = 2 +) + +// getGSOSize parses control for UDP_GRO and if found returns its GSO size data. +func getGSOSize(control []byte) (int, error) { + var ( + hdr unix.Cmsghdr + data []byte + rem = control + err error + ) + + for len(rem) > unix.SizeofCmsghdr { + hdr, data, rem, err = unix.ParseOneSocketControlMessage(rem) + if err != nil { + return 0, fmt.Errorf("error parsing socket control message: %w", err) + } + if hdr.Level == unix.SOL_UDP && hdr.Type == unix.UDP_GRO && len(data) >= sizeOfGSOData { + var gso uint16 + copy(unsafe.Slice((*byte)(unsafe.Pointer(&gso)), sizeOfGSOData), data[:sizeOfGSOData]) + return int(gso), nil + } + } + return 0, nil +} + +// setGSOSize sets a UDP_SEGMENT in control based on gsoSize. It leaves existing +// data in control untouched. +func setGSOSize(control *[]byte, gsoSize uint16) { + existingLen := len(*control) + avail := cap(*control) - existingLen + space := unix.CmsgSpace(sizeOfGSOData) + if avail < space { + return + } + *control = (*control)[:cap(*control)] + gsoControl := (*control)[existingLen:] + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&(gsoControl)[0])) + hdr.Level = unix.SOL_UDP + hdr.Type = unix.UDP_SEGMENT + hdr.SetLen(unix.CmsgLen(sizeOfGSOData)) + copy((gsoControl)[unix.CmsgLen(0):], unsafe.Slice((*byte)(unsafe.Pointer(&gsoSize)), sizeOfGSOData)) + *control = (*control)[:existingLen+space] +} + +// gsoControlSize returns the recommended buffer size for pooling UDP +// offloading control data. +var gsoControlSize = unix.CmsgSpace(sizeOfGSOData) diff --git a/conn/mark_default.go b/conn/mark_default.go index 6e01b0d..3102384 100644 --- a/conn/mark_default.go +++ b/conn/mark_default.go @@ -2,11 +2,11 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn -func (bind *StdNetBind) SetMark(mark uint32) error { +func (s *StdNetBind) SetMark(mark uint32) error { return nil } diff --git a/conn/mark_unix.go b/conn/mark_unix.go index fec154c..d9e46ee 100644 --- a/conn/mark_unix.go +++ b/conn/mark_unix.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package conn @@ -26,13 +26,13 @@ func init() { } } -func (bind *StdNetBind) SetMark(mark uint32) error { +func (s *StdNetBind) SetMark(mark uint32) error { var operr error if fwmarkIoctl == 0 { return nil } - if bind.ipv4 != nil { - fd, err := bind.ipv4.SyscallConn() + if s.ipv4 != nil { + fd, err := s.ipv4.SyscallConn() if err != nil { return err } @@ -46,8 +46,8 @@ func (bind *StdNetBind) SetMark(mark uint32) error { return err } } - if bind.ipv6 != nil { - fd, err := bind.ipv6.SyscallConn() + if s.ipv6 != nil { + fd, err := s.ipv6.SyscallConn() if err != nil { return err } diff --git a/conn/sticky_default.go b/conn/sticky_default.go new file mode 100644 index 0000000..0b21386 --- /dev/null +++ b/conn/sticky_default.go @@ -0,0 +1,42 @@ +//go:build !linux || android + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import "net/netip" + +func (e *StdNetEndpoint) SrcIP() netip.Addr { + return netip.Addr{} +} + +func (e *StdNetEndpoint) SrcIfidx() int32 { + return 0 +} + +func (e *StdNetEndpoint) SrcToString() string { + return "" +} + +// TODO: macOS, FreeBSD and other BSDs likely do support the sticky sockets +// {get,set}srcControl feature set, but use alternatively named flags and need +// ports and require testing. + +// getSrcFromControl parses the control for PKTINFO and if found updates ep with +// the source information found. +func getSrcFromControl(control []byte, ep *StdNetEndpoint) { +} + +// setSrcControl parses the control for PKTINFO and if found updates ep with +// the source information found. +func setSrcControl(control *[]byte, ep *StdNetEndpoint) { +} + +// stickyControlSize returns the recommended buffer size for pooling sticky +// offloading control data. +const stickyControlSize = 0 + +const StdNetSupportsStickySockets = false diff --git a/conn/sticky_linux.go b/conn/sticky_linux.go new file mode 100644 index 0000000..8e206e9 --- /dev/null +++ b/conn/sticky_linux.go @@ -0,0 +1,112 @@ +//go:build linux && !android + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "net/netip" + "unsafe" + + "golang.org/x/sys/unix" +) + +func (e *StdNetEndpoint) SrcIP() netip.Addr { + switch len(e.src) { + case unix.CmsgSpace(unix.SizeofInet4Pktinfo): + info := (*unix.Inet4Pktinfo)(unsafe.Pointer(&e.src[unix.CmsgLen(0)])) + return netip.AddrFrom4(info.Spec_dst) + case unix.CmsgSpace(unix.SizeofInet6Pktinfo): + info := (*unix.Inet6Pktinfo)(unsafe.Pointer(&e.src[unix.CmsgLen(0)])) + // TODO: set zone. in order to do so we need to check if the address is + // link local, and if it is perform a syscall to turn the ifindex into a + // zone string because netip uses string zones. + return netip.AddrFrom16(info.Addr) + } + return netip.Addr{} +} + +func (e *StdNetEndpoint) SrcIfidx() int32 { + switch len(e.src) { + case unix.CmsgSpace(unix.SizeofInet4Pktinfo): + info := (*unix.Inet4Pktinfo)(unsafe.Pointer(&e.src[unix.CmsgLen(0)])) + return info.Ifindex + case unix.CmsgSpace(unix.SizeofInet6Pktinfo): + info := (*unix.Inet6Pktinfo)(unsafe.Pointer(&e.src[unix.CmsgLen(0)])) + return int32(info.Ifindex) + } + return 0 +} + +func (e *StdNetEndpoint) SrcToString() string { + return e.SrcIP().String() +} + +// getSrcFromControl parses the control for PKTINFO and if found updates ep with +// the source information found. +func getSrcFromControl(control []byte, ep *StdNetEndpoint) { + ep.ClearSrc() + + var ( + hdr unix.Cmsghdr + data []byte + rem []byte = control + err error + ) + + for len(rem) > unix.SizeofCmsghdr { + hdr, data, rem, err = unix.ParseOneSocketControlMessage(rem) + if err != nil { + return + } + + if hdr.Level == unix.IPPROTO_IP && + hdr.Type == unix.IP_PKTINFO { + + if ep.src == nil || cap(ep.src) < unix.CmsgSpace(unix.SizeofInet4Pktinfo) { + ep.src = make([]byte, 0, unix.CmsgSpace(unix.SizeofInet4Pktinfo)) + } + ep.src = ep.src[:unix.CmsgSpace(unix.SizeofInet4Pktinfo)] + + hdrBuf := unsafe.Slice((*byte)(unsafe.Pointer(&hdr)), unix.SizeofCmsghdr) + copy(ep.src, hdrBuf) + copy(ep.src[unix.CmsgLen(0):], data) + return + } + + if hdr.Level == unix.IPPROTO_IPV6 && + hdr.Type == unix.IPV6_PKTINFO { + + if ep.src == nil || cap(ep.src) < unix.CmsgSpace(unix.SizeofInet6Pktinfo) { + ep.src = make([]byte, 0, unix.CmsgSpace(unix.SizeofInet6Pktinfo)) + } + + ep.src = ep.src[:unix.CmsgSpace(unix.SizeofInet6Pktinfo)] + + hdrBuf := unsafe.Slice((*byte)(unsafe.Pointer(&hdr)), unix.SizeofCmsghdr) + copy(ep.src, hdrBuf) + copy(ep.src[unix.CmsgLen(0):], data) + return + } + } +} + +// setSrcControl sets an IP{V6}_PKTINFO in control based on the source address +// and source ifindex found in ep. control's len will be set to 0 in the event +// that ep is a default value. +func setSrcControl(control *[]byte, ep *StdNetEndpoint) { + if cap(*control) < len(ep.src) { + return + } + *control = (*control)[:0] + *control = append(*control, ep.src...) +} + +// stickyControlSize returns the recommended buffer size for pooling sticky +// offloading control data. +var stickyControlSize = unix.CmsgSpace(unix.SizeofInet6Pktinfo) + +const StdNetSupportsStickySockets = true diff --git a/conn/sticky_linux_test.go b/conn/sticky_linux_test.go new file mode 100644 index 0000000..d2bd584 --- /dev/null +++ b/conn/sticky_linux_test.go @@ -0,0 +1,266 @@ +//go:build linux && !android + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package conn + +import ( + "context" + "net" + "net/netip" + "runtime" + "testing" + "unsafe" + + "golang.org/x/sys/unix" +) + +func setSrc(ep *StdNetEndpoint, addr netip.Addr, ifidx int32) { + var buf []byte + if addr.Is4() { + buf = make([]byte, unix.CmsgSpace(unix.SizeofInet4Pktinfo)) + hdr := unix.Cmsghdr{ + Level: unix.IPPROTO_IP, + Type: unix.IP_PKTINFO, + } + hdr.SetLen(unix.CmsgLen(unix.SizeofInet4Pktinfo)) + copy(buf, unsafe.Slice((*byte)(unsafe.Pointer(&hdr)), int(unsafe.Sizeof(hdr)))) + + info := unix.Inet4Pktinfo{ + Ifindex: ifidx, + Spec_dst: addr.As4(), + } + copy(buf[unix.CmsgLen(0):], unsafe.Slice((*byte)(unsafe.Pointer(&info)), unix.SizeofInet4Pktinfo)) + } else { + buf = make([]byte, unix.CmsgSpace(unix.SizeofInet6Pktinfo)) + hdr := unix.Cmsghdr{ + Level: unix.IPPROTO_IPV6, + Type: unix.IPV6_PKTINFO, + } + hdr.SetLen(unix.CmsgLen(unix.SizeofInet6Pktinfo)) + copy(buf, unsafe.Slice((*byte)(unsafe.Pointer(&hdr)), int(unsafe.Sizeof(hdr)))) + + info := unix.Inet6Pktinfo{ + Ifindex: uint32(ifidx), + Addr: addr.As16(), + } + copy(buf[unix.CmsgLen(0):], unsafe.Slice((*byte)(unsafe.Pointer(&info)), unix.SizeofInet6Pktinfo)) + } + + ep.src = buf +} + +func Test_setSrcControl(t *testing.T) { + t.Run("IPv4", func(t *testing.T) { + ep := &StdNetEndpoint{ + AddrPort: netip.MustParseAddrPort("127.0.0.1:1234"), + } + setSrc(ep, netip.MustParseAddr("127.0.0.1"), 5) + + control := make([]byte, stickyControlSize) + + setSrcControl(&control, ep) + + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + if hdr.Level != unix.IPPROTO_IP { + t.Errorf("unexpected level: %d", hdr.Level) + } + if hdr.Type != unix.IP_PKTINFO { + t.Errorf("unexpected type: %d", hdr.Type) + } + if uint(hdr.Len) != uint(unix.CmsgLen(int(unsafe.Sizeof(unix.Inet4Pktinfo{})))) { + t.Errorf("unexpected length: %d", hdr.Len) + } + info := (*unix.Inet4Pktinfo)(unsafe.Pointer(&control[unix.CmsgLen(0)])) + if info.Spec_dst[0] != 127 || info.Spec_dst[1] != 0 || info.Spec_dst[2] != 0 || info.Spec_dst[3] != 1 { + t.Errorf("unexpected address: %v", info.Spec_dst) + } + if info.Ifindex != 5 { + t.Errorf("unexpected ifindex: %d", info.Ifindex) + } + }) + + t.Run("IPv6", func(t *testing.T) { + ep := &StdNetEndpoint{ + AddrPort: netip.MustParseAddrPort("[::1]:1234"), + } + setSrc(ep, netip.MustParseAddr("::1"), 5) + + control := make([]byte, stickyControlSize) + + setSrcControl(&control, ep) + + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + if hdr.Level != unix.IPPROTO_IPV6 { + t.Errorf("unexpected level: %d", hdr.Level) + } + if hdr.Type != unix.IPV6_PKTINFO { + t.Errorf("unexpected type: %d", hdr.Type) + } + if uint(hdr.Len) != uint(unix.CmsgLen(int(unsafe.Sizeof(unix.Inet6Pktinfo{})))) { + t.Errorf("unexpected length: %d", hdr.Len) + } + info := (*unix.Inet6Pktinfo)(unsafe.Pointer(&control[unix.CmsgLen(0)])) + if info.Addr != ep.SrcIP().As16() { + t.Errorf("unexpected address: %v", info.Addr) + } + if info.Ifindex != 5 { + t.Errorf("unexpected ifindex: %d", info.Ifindex) + } + }) + + t.Run("ClearOnNoSrc", func(t *testing.T) { + control := make([]byte, stickyControlSize) + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + hdr.Level = 1 + hdr.Type = 2 + hdr.Len = 3 + + setSrcControl(&control, &StdNetEndpoint{}) + + if len(control) != 0 { + t.Errorf("unexpected control: %v", control) + } + }) +} + +func Test_getSrcFromControl(t *testing.T) { + t.Run("IPv4", func(t *testing.T) { + control := make([]byte, stickyControlSize) + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + hdr.Level = unix.IPPROTO_IP + hdr.Type = unix.IP_PKTINFO + hdr.SetLen(unix.CmsgLen(int(unsafe.Sizeof(unix.Inet4Pktinfo{})))) + info := (*unix.Inet4Pktinfo)(unsafe.Pointer(&control[unix.CmsgLen(0)])) + info.Spec_dst = [4]byte{127, 0, 0, 1} + info.Ifindex = 5 + + ep := &StdNetEndpoint{} + getSrcFromControl(control, ep) + + if ep.SrcIP() != netip.MustParseAddr("127.0.0.1") { + t.Errorf("unexpected address: %v", ep.SrcIP()) + } + if ep.SrcIfidx() != 5 { + t.Errorf("unexpected ifindex: %d", ep.SrcIfidx()) + } + }) + t.Run("IPv6", func(t *testing.T) { + control := make([]byte, stickyControlSize) + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + hdr.Level = unix.IPPROTO_IPV6 + hdr.Type = unix.IPV6_PKTINFO + hdr.SetLen(unix.CmsgLen(int(unsafe.Sizeof(unix.Inet6Pktinfo{})))) + info := (*unix.Inet6Pktinfo)(unsafe.Pointer(&control[unix.CmsgLen(0)])) + info.Addr = [16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1} + info.Ifindex = 5 + + ep := &StdNetEndpoint{} + getSrcFromControl(control, ep) + + if ep.SrcIP() != netip.MustParseAddr("::1") { + t.Errorf("unexpected address: %v", ep.SrcIP()) + } + if ep.SrcIfidx() != 5 { + t.Errorf("unexpected ifindex: %d", ep.SrcIfidx()) + } + }) + t.Run("ClearOnEmpty", func(t *testing.T) { + var control []byte + ep := &StdNetEndpoint{} + setSrc(ep, netip.MustParseAddr("::1"), 5) + + getSrcFromControl(control, ep) + if ep.SrcIP().IsValid() { + t.Errorf("unexpected address: %v", ep.SrcIP()) + } + if ep.SrcIfidx() != 0 { + t.Errorf("unexpected ifindex: %d", ep.SrcIfidx()) + } + }) + t.Run("Multiple", func(t *testing.T) { + zeroControl := make([]byte, unix.CmsgSpace(0)) + zeroHdr := (*unix.Cmsghdr)(unsafe.Pointer(&zeroControl[0])) + zeroHdr.SetLen(unix.CmsgLen(0)) + + control := make([]byte, unix.CmsgSpace(unix.SizeofInet4Pktinfo)) + hdr := (*unix.Cmsghdr)(unsafe.Pointer(&control[0])) + hdr.Level = unix.IPPROTO_IP + hdr.Type = unix.IP_PKTINFO + hdr.SetLen(unix.CmsgLen(int(unsafe.Sizeof(unix.Inet4Pktinfo{})))) + info := (*unix.Inet4Pktinfo)(unsafe.Pointer(&control[unix.CmsgLen(0)])) + info.Spec_dst = [4]byte{127, 0, 0, 1} + info.Ifindex = 5 + + combined := make([]byte, 0) + combined = append(combined, zeroControl...) + combined = append(combined, control...) + + ep := &StdNetEndpoint{} + getSrcFromControl(combined, ep) + + if ep.SrcIP() != netip.MustParseAddr("127.0.0.1") { + t.Errorf("unexpected address: %v", ep.SrcIP()) + } + if ep.SrcIfidx() != 5 { + t.Errorf("unexpected ifindex: %d", ep.SrcIfidx()) + } + }) +} + +func Test_listenConfig(t *testing.T) { + t.Run("IPv4", func(t *testing.T) { + conn, err := listenConfig().ListenPacket(context.Background(), "udp4", ":0") + if err != nil { + t.Fatal(err) + } + defer conn.Close() + sc, err := conn.(*net.UDPConn).SyscallConn() + if err != nil { + t.Fatal(err) + } + + if runtime.GOOS == "linux" { + var i int + sc.Control(func(fd uintptr) { + i, err = unix.GetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_PKTINFO) + }) + if err != nil { + t.Fatal(err) + } + if i != 1 { + t.Error("IP_PKTINFO not set!") + } + } else { + t.Logf("listenConfig() does not set IPV6_RECVPKTINFO on %s", runtime.GOOS) + } + }) + t.Run("IPv6", func(t *testing.T) { + conn, err := listenConfig().ListenPacket(context.Background(), "udp6", ":0") + if err != nil { + t.Fatal(err) + } + sc, err := conn.(*net.UDPConn).SyscallConn() + if err != nil { + t.Fatal(err) + } + + if runtime.GOOS == "linux" { + var i int + sc.Control(func(fd uintptr) { + i, err = unix.GetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_RECVPKTINFO) + }) + if err != nil { + t.Fatal(err) + } + if i != 1 { + t.Error("IPV6_PKTINFO not set!") + } + } else { + t.Logf("listenConfig() does not set IPV6_RECVPKTINFO on %s", runtime.GOOS) + } + }) +} diff --git a/conn/winrio/rio_windows.go b/conn/winrio/rio_windows.go index 0a07c65..d1037bb 100644 --- a/conn/winrio/rio_windows.go +++ b/conn/winrio/rio_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package winrio @@ -84,8 +84,10 @@ type iocpNotificationCompletion struct { overlapped *windows.Overlapped } -var initialized sync.Once -var available bool +var ( + initialized sync.Once + available bool +) func Initialize() bool { initialized.Do(func() { @@ -108,7 +110,7 @@ func Initialize() bool { return } defer windows.CloseHandle(socket) - var WSAID_MULTIPLE_RIO = &windows.GUID{0x8509e081, 0x96dd, 0x4005, [8]byte{0xb1, 0x65, 0x9e, 0x2e, 0xe8, 0xc7, 0x9e, 0x3f}} + WSAID_MULTIPLE_RIO := &windows.GUID{0x8509e081, 0x96dd, 0x4005, [8]byte{0xb1, 0x65, 0x9e, 0x2e, 0xe8, 0xc7, 0x9e, 0x3f}} const SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER = 0xc8000024 ob := uint32(0) err = windows.WSAIoctl(socket, SIO_GET_MULTIPLE_EXTENSION_FUNCTION_POINTER, diff --git a/device/alignment_test.go b/device/alignment_test.go deleted file mode 100644 index a918112..0000000 --- a/device/alignment_test.go +++ /dev/null @@ -1,65 +0,0 @@ -/* SPDX-License-Identifier: MIT - * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. - */ - -package device - -import ( - "reflect" - "testing" - "unsafe" -) - -func checkAlignment(t *testing.T, name string, offset uintptr) { - t.Helper() - if offset%8 != 0 { - t.Errorf("offset of %q within struct is %d bytes, which does not align to 64-bit word boundaries (missing %d bytes). Atomic operations will crash on 32-bit systems.", name, offset, 8-(offset%8)) - } -} - -// TestPeerAlignment checks that atomically-accessed fields are -// aligned to 64-bit boundaries, as required by the atomic package. -// -// Unfortunately, violating this rule on 32-bit platforms results in a -// hard segfault at runtime. -func TestPeerAlignment(t *testing.T) { - var p Peer - - typ := reflect.TypeOf(&p).Elem() - t.Logf("Peer type size: %d, with fields:", typ.Size()) - for i := 0; i < typ.NumField(); i++ { - field := typ.Field(i) - t.Logf("\t%30s\toffset=%3v\t(type size=%3d, align=%d)", - field.Name, - field.Offset, - field.Type.Size(), - field.Type.Align(), - ) - } - - checkAlignment(t, "Peer.stats", unsafe.Offsetof(p.stats)) - checkAlignment(t, "Peer.isRunning", unsafe.Offsetof(p.isRunning)) -} - -// TestDeviceAlignment checks that atomically-accessed fields are -// aligned to 64-bit boundaries, as required by the atomic package. -// -// Unfortunately, violating this rule on 32-bit platforms results in a -// hard segfault at runtime. -func TestDeviceAlignment(t *testing.T) { - var d Device - - typ := reflect.TypeOf(&d).Elem() - t.Logf("Device type size: %d, with fields:", typ.Size()) - for i := 0; i < typ.NumField(); i++ { - field := typ.Field(i) - t.Logf("\t%30s\toffset=%3v\t(type size=%3d, align=%d)", - field.Name, - field.Offset, - field.Type.Size(), - field.Type.Align(), - ) - } - checkAlignment(t, "Device.rate.underLoadUntil", unsafe.Offsetof(d.rate)+unsafe.Offsetof(d.rate.underLoadUntil)) -} diff --git a/device/allowedips.go b/device/allowedips.go index 06c5465..fa46f97 100644 --- a/device/allowedips.go +++ b/device/allowedips.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -11,10 +11,9 @@ import ( "errors" "math/bits" "net" + "net/netip" "sync" "unsafe" - - "golang.zx2c4.com/go118/netip" ) type parentIndirection struct { diff --git a/device/allowedips_rand_test.go b/device/allowedips_rand_test.go index ff56fe6..07065c3 100644 --- a/device/allowedips_rand_test.go +++ b/device/allowedips_rand_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -8,10 +8,9 @@ package device import ( "math/rand" "net" + "net/netip" "sort" "testing" - - "golang.zx2c4.com/go118/netip" ) const ( diff --git a/device/allowedips_test.go b/device/allowedips_test.go index a274997..cde068e 100644 --- a/device/allowedips_test.go +++ b/device/allowedips_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -8,9 +8,8 @@ package device import ( "math/rand" "net" + "net/netip" "testing" - - "golang.zx2c4.com/go118/netip" ) type testPairCommonBits struct { @@ -20,7 +19,6 @@ type testPairCommonBits struct { } func TestCommonBits(t *testing.T) { - tests := []testPairCommonBits{ {s1: []byte{1, 4, 53, 128}, s2: []byte{0, 0, 0, 0}, match: 7}, {s1: []byte{0, 4, 53, 128}, s2: []byte{0, 0, 0, 0}, match: 13}, @@ -41,7 +39,7 @@ func TestCommonBits(t *testing.T) { } } -func benchmarkTrie(peerNumber int, addressNumber int, addressLength int, b *testing.B) { +func benchmarkTrie(peerNumber, addressNumber, addressLength int, b *testing.B) { var trie *trieEntry var peers []*Peer root := parentIndirection{&trie, 2} diff --git a/device/bind_test.go b/device/bind_test.go index 1c0d247..302a521 100644 --- a/device/bind_test.go +++ b/device/bind_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -26,21 +26,21 @@ func (b *DummyBind) SetMark(v uint32) error { return nil } -func (b *DummyBind) ReceiveIPv6(buff []byte) (int, conn.Endpoint, error) { +func (b *DummyBind) ReceiveIPv6(buf []byte) (int, conn.Endpoint, error) { datagram, ok := <-b.in6 if !ok { return 0, nil, errors.New("closed") } - copy(buff, datagram.msg) + copy(buf, datagram.msg) return len(datagram.msg), datagram.endpoint, nil } -func (b *DummyBind) ReceiveIPv4(buff []byte) (int, conn.Endpoint, error) { +func (b *DummyBind) ReceiveIPv4(buf []byte) (int, conn.Endpoint, error) { datagram, ok := <-b.in4 if !ok { return 0, nil, errors.New("closed") } - copy(buff, datagram.msg) + copy(buf, datagram.msg) return len(datagram.msg), datagram.endpoint, nil } @@ -51,6 +51,6 @@ func (b *DummyBind) Close() error { return nil } -func (b *DummyBind) Send(buff []byte, end conn.Endpoint) error { +func (b *DummyBind) Send(buf []byte, end conn.Endpoint) error { return nil } diff --git a/device/channels.go b/device/channels.go index 6f4370a..e526f6b 100644 --- a/device/channels.go +++ b/device/channels.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -19,13 +19,13 @@ import ( // call wg.Done to remove the initial reference. // When the refcount hits 0, the queue's channel is closed. type outboundQueue struct { - c chan *QueueOutboundElement + c chan *QueueOutboundElementsContainer wg sync.WaitGroup } func newOutboundQueue() *outboundQueue { q := &outboundQueue{ - c: make(chan *QueueOutboundElement, QueueOutboundSize), + c: make(chan *QueueOutboundElementsContainer, QueueOutboundSize), } q.wg.Add(1) go func() { @@ -37,13 +37,13 @@ func newOutboundQueue() *outboundQueue { // A inboundQueue is similar to an outboundQueue; see those docs. type inboundQueue struct { - c chan *QueueInboundElement + c chan *QueueInboundElementsContainer wg sync.WaitGroup } func newInboundQueue() *inboundQueue { q := &inboundQueue{ - c: make(chan *QueueInboundElement, QueueInboundSize), + c: make(chan *QueueInboundElementsContainer, QueueInboundSize), } q.wg.Add(1) go func() { @@ -72,7 +72,7 @@ func newHandshakeQueue() *handshakeQueue { } type autodrainingInboundQueue struct { - c chan *QueueInboundElement + c chan *QueueInboundElementsContainer } // newAutodrainingInboundQueue returns a channel that will be drained when it gets GC'd. @@ -81,7 +81,7 @@ type autodrainingInboundQueue struct { // some other means, such as sending a sentinel nil values. func newAutodrainingInboundQueue(device *Device) *autodrainingInboundQueue { q := &autodrainingInboundQueue{ - c: make(chan *QueueInboundElement, QueueInboundSize), + c: make(chan *QueueInboundElementsContainer, QueueInboundSize), } runtime.SetFinalizer(q, device.flushInboundQueue) return q @@ -90,10 +90,13 @@ func newAutodrainingInboundQueue(device *Device) *autodrainingInboundQueue { func (device *Device) flushInboundQueue(q *autodrainingInboundQueue) { for { select { - case elem := <-q.c: - elem.Lock() - device.PutMessageBuffer(elem.buffer) - device.PutInboundElement(elem) + case elemsContainer := <-q.c: + elemsContainer.Lock() + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutInboundElement(elem) + } + device.PutInboundElementsContainer(elemsContainer) default: return } @@ -101,7 +104,7 @@ func (device *Device) flushInboundQueue(q *autodrainingInboundQueue) { } type autodrainingOutboundQueue struct { - c chan *QueueOutboundElement + c chan *QueueOutboundElementsContainer } // newAutodrainingOutboundQueue returns a channel that will be drained when it gets GC'd. @@ -111,7 +114,7 @@ type autodrainingOutboundQueue struct { // All sends to the channel must be best-effort, because there may be no receivers. func newAutodrainingOutboundQueue(device *Device) *autodrainingOutboundQueue { q := &autodrainingOutboundQueue{ - c: make(chan *QueueOutboundElement, QueueOutboundSize), + c: make(chan *QueueOutboundElementsContainer, QueueOutboundSize), } runtime.SetFinalizer(q, device.flushOutboundQueue) return q @@ -120,10 +123,13 @@ func newAutodrainingOutboundQueue(device *Device) *autodrainingOutboundQueue { func (device *Device) flushOutboundQueue(q *autodrainingOutboundQueue) { for { select { - case elem := <-q.c: - elem.Lock() - device.PutMessageBuffer(elem.buffer) - device.PutOutboundElement(elem) + case elemsContainer := <-q.c: + elemsContainer.Lock() + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutOutboundElement(elem) + } + device.PutOutboundElementsContainer(elemsContainer) default: return } diff --git a/device/constants.go b/device/constants.go index 53a2526..59854a1 100644 --- a/device/constants.go +++ b/device/constants.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/cookie.go b/device/cookie.go index b02b769..876f05d 100644 --- a/device/cookie.go +++ b/device/cookie.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -83,7 +83,7 @@ func (st *CookieChecker) CheckMAC1(msg []byte) bool { return hmac.Equal(mac1[:], msg[smac1:smac2]) } -func (st *CookieChecker) CheckMAC2(msg []byte, src []byte) bool { +func (st *CookieChecker) CheckMAC2(msg, src []byte) bool { st.RLock() defer st.RUnlock() @@ -119,7 +119,6 @@ func (st *CookieChecker) CreateReply( recv uint32, src []byte, ) (*MessageCookieReply, error) { - st.RLock() // refresh cookie secret @@ -204,7 +203,6 @@ func (st *CookieGenerator) ConsumeReply(msg *MessageCookieReply) bool { xchapoly, _ := chacha20poly1305.NewX(st.mac2.encryptionKey[:]) _, err := xchapoly.Open(cookie[:0], msg.Nonce[:], msg.Cookie[:], st.mac2.lastMAC1[:]) - if err != nil { return false } @@ -215,7 +213,6 @@ func (st *CookieGenerator) ConsumeReply(msg *MessageCookieReply) bool { } func (st *CookieGenerator) AddMacs(msg []byte) { - size := len(msg) smac2 := size - blake2s.Size128 diff --git a/device/cookie_test.go b/device/cookie_test.go index 02e01d1..4f1e50a 100644 --- a/device/cookie_test.go +++ b/device/cookie_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -10,7 +10,6 @@ import ( ) func TestCookieMAC1(t *testing.T) { - // setup generator / checker var ( @@ -132,12 +131,12 @@ func TestCookieMAC1(t *testing.T) { msg[5] ^= 0x20 - srcBad1 := []byte{192, 168, 13, 37, 40, 01} + srcBad1 := []byte{192, 168, 13, 37, 40, 1} if checker.CheckMAC2(msg, srcBad1) { t.Fatal("MAC2 generation/verification failed") } - srcBad2 := []byte{192, 168, 13, 38, 40, 01} + srcBad2 := []byte{192, 168, 13, 38, 40, 1} if checker.CheckMAC2(msg, srcBad2) { t.Fatal("MAC2 generation/verification failed") } diff --git a/device/device.go b/device/device.go index 3625608..83c33ee 100644 --- a/device/device.go +++ b/device/device.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -30,7 +30,7 @@ type Device struct { // will become the actual state; Up can fail. // The device can also change state multiple times between time of check and time of use. // Unsynchronized uses of state must therefore be advisory/best-effort only. - state uint32 // actually a deviceState, but typed uint32 for convenience + state atomic.Uint32 // actually a deviceState, but typed uint32 for convenience // stopping blocks until all inputs to Device have been closed. stopping sync.WaitGroup // mu protects state changes. @@ -58,9 +58,8 @@ type Device struct { keyMap map[NoisePublicKey]*Peer } - // Keep this 8-byte aligned rate struct { - underLoadUntil int64 + underLoadUntil atomic.Int64 limiter ratelimiter.Ratelimiter } @@ -69,9 +68,11 @@ type Device struct { cookieChecker CookieChecker pool struct { - messageBuffers *WaitPool - inboundElements *WaitPool - outboundElements *WaitPool + inboundElementsContainer *WaitPool + outboundElementsContainer *WaitPool + messageBuffers *WaitPool + inboundElements *WaitPool + outboundElements *WaitPool } queue struct { @@ -82,7 +83,7 @@ type Device struct { tun struct { device tun.Device - mtu int32 + mtu atomic.Int32 } ipcMutex sync.RWMutex @@ -94,10 +95,9 @@ type Device struct { // There are three states: down, up, closed. // Transitions: // -// down -----+ -// ↑↓ ↓ -// up -> closed -// +// down -----+ +// ↑↓ ↓ +// up -> closed type deviceState uint32 //go:generate go run golang.org/x/tools/cmd/stringer -type deviceState -trimprefix=deviceState @@ -110,7 +110,7 @@ const ( // deviceState returns device.state.state as a deviceState // See those docs for how to interpret this value. func (device *Device) deviceState() deviceState { - return deviceState(atomic.LoadUint32(&device.state.state)) + return deviceState(device.state.state.Load()) } // isClosed reports whether the device is closed (or is closing). @@ -149,14 +149,14 @@ func (device *Device) changeState(want deviceState) (err error) { case old: return nil case deviceStateUp: - atomic.StoreUint32(&device.state.state, uint32(deviceStateUp)) + device.state.state.Store(uint32(deviceStateUp)) err = device.upLocked() if err == nil { break } fallthrough // up failed; bring the device all the way back down case deviceStateDown: - atomic.StoreUint32(&device.state.state, uint32(deviceStateDown)) + device.state.state.Store(uint32(deviceStateDown)) errDown := device.downLocked() if err == nil { err = errDown @@ -182,7 +182,7 @@ func (device *Device) upLocked() error { device.peers.RLock() for _, peer := range device.peers.keyMap { peer.Start() - if atomic.LoadUint32(&peer.persistentKeepaliveInterval) > 0 { + if peer.persistentKeepaliveInterval.Load() > 0 { peer.SendKeepalive() } } @@ -219,11 +219,11 @@ func (device *Device) IsUnderLoad() bool { now := time.Now() underLoad := len(device.queue.handshake.c) >= QueueHandshakeSize/8 if underLoad { - atomic.StoreInt64(&device.rate.underLoadUntil, now.Add(UnderLoadAfterTime).UnixNano()) + device.rate.underLoadUntil.Store(now.Add(UnderLoadAfterTime).UnixNano()) return true } // check if recently under load - return atomic.LoadInt64(&device.rate.underLoadUntil) > now.UnixNano() + return device.rate.underLoadUntil.Load() > now.UnixNano() } func (device *Device) SetPrivateKey(sk NoisePrivateKey) error { @@ -267,7 +267,7 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) error { expiredPeers := make([]*Peer, 0, len(device.peers.keyMap)) for _, peer := range device.peers.keyMap { handshake := &peer.handshake - handshake.precomputedStaticStatic = device.staticIdentity.privateKey.sharedSecret(handshake.remoteStatic) + handshake.precomputedStaticStatic, _ = device.staticIdentity.privateKey.sharedSecret(handshake.remoteStatic) expiredPeers = append(expiredPeers, peer) } @@ -283,7 +283,7 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) error { func NewDevice(tunDevice tun.Device, bind conn.Bind, logger *Logger) *Device { device := new(Device) - device.state.state = uint32(deviceStateDown) + device.state.state.Store(uint32(deviceStateDown)) device.closed = make(chan struct{}) device.log = logger device.net.bind = bind @@ -293,10 +293,11 @@ func NewDevice(tunDevice tun.Device, bind conn.Bind, logger *Logger) *Device { device.log.Errorf("Trouble determining MTU, assuming default: %v", err) mtu = DefaultMTU } - device.tun.mtu = int32(mtu) + device.tun.mtu.Store(int32(mtu)) device.peers.keyMap = make(map[NoisePublicKey]*Peer) device.rate.limiter.Init() device.indexTable.Init() + device.PopulatePools() // create queues @@ -324,6 +325,19 @@ func NewDevice(tunDevice tun.Device, bind conn.Bind, logger *Logger) *Device { return device } +// BatchSize returns the BatchSize for the device as a whole which is the max of +// the bind batch size and the tun batch size. The batch size reported by device +// is the size used to construct memory pools, and is the allowed batch size for +// the lifetime of the device. +func (device *Device) BatchSize() int { + size := device.net.bind.BatchSize() + dSize := device.tun.device.BatchSize() + if size < dSize { + size = dSize + } + return size +} + func (device *Device) LookupPeer(pk NoisePublicKey) *Peer { device.peers.RLock() defer device.peers.RUnlock() @@ -356,10 +370,12 @@ func (device *Device) RemoveAllPeers() { func (device *Device) Close() { device.state.Lock() defer device.state.Unlock() + device.ipcMutex.Lock() + defer device.ipcMutex.Unlock() if device.isClosed() { return } - atomic.StoreUint32(&device.state.state, uint32(deviceStateClosed)) + device.state.state.Store(uint32(deviceStateClosed)) device.log.Verbosef("Device closing") device.tun.device.Close() @@ -445,11 +461,7 @@ func (device *Device) BindSetMark(mark uint32) error { // clear cached source addresses device.peers.RLock() for _, peer := range device.peers.keyMap { - peer.Lock() - defer peer.Unlock() - if peer.endpoint != nil { - peer.endpoint.ClearSrc() - } + peer.markEndpointSrcForClearing() } device.peers.RUnlock() @@ -474,11 +486,13 @@ func (device *Device) BindUpdate() error { var err error var recvFns []conn.ReceiveFunc netc := &device.net + recvFns, netc.port, err = netc.bind.Open(netc.port) if err != nil { netc.port = 0 return err } + netc.netlinkCancel, err = device.startRouteListener(netc.bind) if err != nil { netc.bind.Close() @@ -497,11 +511,7 @@ func (device *Device) BindUpdate() error { // clear cached source addresses device.peers.RLock() for _, peer := range device.peers.keyMap { - peer.Lock() - defer peer.Unlock() - if peer.endpoint != nil { - peer.endpoint.ClearSrc() - } + peer.markEndpointSrcForClearing() } device.peers.RUnlock() @@ -509,8 +519,9 @@ func (device *Device) BindUpdate() error { device.net.stopping.Add(len(recvFns)) device.queue.decryption.wg.Add(len(recvFns)) // each RoutineReceiveIncoming goroutine writes to device.queue.decryption device.queue.handshake.wg.Add(len(recvFns)) // each RoutineReceiveIncoming goroutine writes to device.queue.handshake + batchSize := netc.bind.BatchSize() for _, fn := range recvFns { - go device.RoutineReceiveIncoming(fn) + go device.RoutineReceiveIncoming(batchSize, fn) } device.log.Verbosef("UDP bind has been updated") diff --git a/device/device_test.go b/device/device_test.go index 84221be..fff172b 100644 --- a/device/device_test.go +++ b/device/device_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -11,6 +11,8 @@ import ( "fmt" "io" "math/rand" + "net/netip" + "os" "runtime" "runtime/pprof" "sync" @@ -18,9 +20,9 @@ import ( "testing" "time" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/conn/bindtest" + "golang.zx2c4.com/wireguard/tun" "golang.zx2c4.com/wireguard/tun/tuntest" ) @@ -48,7 +50,7 @@ func uapiCfg(cfg ...string) string { // genConfigs generates a pair of configs that connect to each other. // The configs use distinct, probably-usable ports. -func genConfigs(tb testing.TB) (cfgs [2]string, endpointCfgs [2]string) { +func genConfigs(tb testing.TB) (cfgs, endpointCfgs [2]string) { var key1, key2 NoisePrivateKey _, err := rand.Read(key1[:]) if err != nil { @@ -307,6 +309,17 @@ func TestConcurrencySafety(t *testing.T) { } }) + // Perform bind updates and keepalive sends concurrently with tunnel use. + t.Run("bindUpdate and keepalive", func(t *testing.T) { + const iters = 10 + for i := 0; i < iters; i++ { + for _, peer := range pair { + peer.dev.BindUpdate() + peer.dev.SendKeepalivesToPeersWithCurrentKeypair() + } + } + }) + close(done) } @@ -333,7 +346,7 @@ func BenchmarkThroughput(b *testing.B) { // Measure how long it takes to receive b.N packets, // starting when we receive the first packet. - var recv uint64 + var recv atomic.Uint64 var elapsed time.Duration var wg sync.WaitGroup wg.Add(1) @@ -342,7 +355,7 @@ func BenchmarkThroughput(b *testing.B) { var start time.Time for { <-pair[0].tun.Inbound - new := atomic.AddUint64(&recv, 1) + new := recv.Add(1) if new == 1 { start = time.Now() } @@ -358,7 +371,7 @@ func BenchmarkThroughput(b *testing.B) { ping := tuntest.Ping(pair[0].ip, pair[1].ip) pingc := pair[1].tun.Outbound var sent uint64 - for atomic.LoadUint64(&recv) != uint64(b.N) { + for recv.Load() != uint64(b.N) { sent++ pingc <- ping } @@ -405,3 +418,59 @@ func goroutineLeakCheck(t *testing.T) { t.Fatalf("expected %d goroutines, got %d, leak?", startGoroutines, endGoroutines) }) } + +type fakeBindSized struct { + size int +} + +func (b *fakeBindSized) Open(port uint16) (fns []conn.ReceiveFunc, actualPort uint16, err error) { + return nil, 0, nil +} +func (b *fakeBindSized) Close() error { return nil } +func (b *fakeBindSized) SetMark(mark uint32) error { return nil } +func (b *fakeBindSized) Send(bufs [][]byte, ep conn.Endpoint) error { return nil } +func (b *fakeBindSized) ParseEndpoint(s string) (conn.Endpoint, error) { return nil, nil } +func (b *fakeBindSized) BatchSize() int { return b.size } + +type fakeTUNDeviceSized struct { + size int +} + +func (t *fakeTUNDeviceSized) File() *os.File { return nil } +func (t *fakeTUNDeviceSized) Read(bufs [][]byte, sizes []int, offset int) (n int, err error) { + return 0, nil +} +func (t *fakeTUNDeviceSized) Write(bufs [][]byte, offset int) (int, error) { return 0, nil } +func (t *fakeTUNDeviceSized) MTU() (int, error) { return 0, nil } +func (t *fakeTUNDeviceSized) Name() (string, error) { return "", nil } +func (t *fakeTUNDeviceSized) Events() <-chan tun.Event { return nil } +func (t *fakeTUNDeviceSized) Close() error { return nil } +func (t *fakeTUNDeviceSized) BatchSize() int { return t.size } + +func TestBatchSize(t *testing.T) { + d := Device{} + + d.net.bind = &fakeBindSized{1} + d.tun.device = &fakeTUNDeviceSized{1} + if want, got := 1, d.BatchSize(); got != want { + t.Errorf("expected batch size %d, got %d", want, got) + } + + d.net.bind = &fakeBindSized{1} + d.tun.device = &fakeTUNDeviceSized{128} + if want, got := 128, d.BatchSize(); got != want { + t.Errorf("expected batch size %d, got %d", want, got) + } + + d.net.bind = &fakeBindSized{128} + d.tun.device = &fakeTUNDeviceSized{1} + if want, got := 128, d.BatchSize(); got != want { + t.Errorf("expected batch size %d, got %d", want, got) + } + + d.net.bind = &fakeBindSized{128} + d.tun.device = &fakeTUNDeviceSized{128} + if want, got := 128, d.BatchSize(); got != want { + t.Errorf("expected batch size %d, got %d", want, got) + } +} diff --git a/device/endpoint_test.go b/device/endpoint_test.go index f1ae47e..93a4998 100644 --- a/device/endpoint_test.go +++ b/device/endpoint_test.go @@ -1,14 +1,13 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device import ( "math/rand" - - "golang.zx2c4.com/go118/netip" + "net/netip" ) type DummyEndpoint struct { diff --git a/device/indextable.go b/device/indextable.go index 15b8b0d..00ade7d 100644 --- a/device/indextable.go +++ b/device/indextable.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/ip.go b/device/ip.go index 50c5040..eaf2363 100644 --- a/device/ip.go +++ b/device/ip.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/kdf_test.go b/device/kdf_test.go index b14aa6d..f9c76d6 100644 --- a/device/kdf_test.go +++ b/device/kdf_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -20,7 +20,7 @@ type KDFTest struct { t2 string } -func assertEquals(t *testing.T, a string, b string) { +func assertEquals(t *testing.T, a, b string) { if a != b { t.Fatal("expected", a, "=", b) } diff --git a/device/keypair.go b/device/keypair.go index 788c947..e3540d7 100644 --- a/device/keypair.go +++ b/device/keypair.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -10,7 +10,6 @@ import ( "sync" "sync/atomic" "time" - "unsafe" "golang.zx2c4.com/wireguard/replay" ) @@ -23,7 +22,7 @@ import ( */ type Keypair struct { - sendNonce uint64 // accessed atomically + sendNonce atomic.Uint64 send cipher.AEAD receive cipher.AEAD replayFilter replay.Filter @@ -37,15 +36,7 @@ type Keypairs struct { sync.RWMutex current *Keypair previous *Keypair - next *Keypair -} - -func (kp *Keypairs) storeNext(next *Keypair) { - atomic.StorePointer((*unsafe.Pointer)((unsafe.Pointer)(&kp.next)), (unsafe.Pointer)(next)) -} - -func (kp *Keypairs) loadNext() *Keypair { - return (*Keypair)(atomic.LoadPointer((*unsafe.Pointer)((unsafe.Pointer)(&kp.next)))) + next atomic.Pointer[Keypair] } func (kp *Keypairs) Current() *Keypair { diff --git a/device/logger.go b/device/logger.go index c79c971..22b0df0 100644 --- a/device/logger.go +++ b/device/logger.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -16,8 +16,8 @@ import ( // They do not require a trailing newline in the format. // If nil, that level of logging will be silent. type Logger struct { - Verbosef func(format string, args ...interface{}) - Errorf func(format string, args ...interface{}) + Verbosef func(format string, args ...any) + Errorf func(format string, args ...any) } // Log levels for use with NewLogger. @@ -28,14 +28,14 @@ const ( ) // Function for use in Logger for discarding logged lines. -func DiscardLogf(format string, args ...interface{}) {} +func DiscardLogf(format string, args ...any) {} // NewLogger constructs a Logger that writes to stdout. // It logs at the specified log level and above. // It decorates log lines with the log level, date, time, and prepend. func NewLogger(level int, prepend string) *Logger { logger := &Logger{DiscardLogf, DiscardLogf} - logf := func(prefix string) func(string, ...interface{}) { + logf := func(prefix string) func(string, ...any) { return log.New(os.Stdout, prefix+": "+prepend, log.Ldate|log.Ltime).Printf } if level >= LogLevelVerbose { diff --git a/device/misc.go b/device/misc.go deleted file mode 100644 index 4126704..0000000 --- a/device/misc.go +++ /dev/null @@ -1,41 +0,0 @@ -/* SPDX-License-Identifier: MIT - * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. - */ - -package device - -import ( - "sync/atomic" -) - -/* Atomic Boolean */ - -const ( - AtomicFalse = int32(iota) - AtomicTrue -) - -type AtomicBool struct { - int32 -} - -func (a *AtomicBool) Get() bool { - return atomic.LoadInt32(&a.int32) == AtomicTrue -} - -func (a *AtomicBool) Swap(val bool) bool { - flag := AtomicFalse - if val { - flag = AtomicTrue - } - return atomic.SwapInt32(&a.int32, flag) == AtomicTrue -} - -func (a *AtomicBool) Set(val bool) { - flag := AtomicFalse - if val { - flag = AtomicTrue - } - atomic.StoreInt32(&a.int32, flag) -} diff --git a/device/mobilequirks.go b/device/mobilequirks.go index 680f5c7..0a0080e 100644 --- a/device/mobilequirks.go +++ b/device/mobilequirks.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -11,9 +11,9 @@ func (device *Device) DisableSomeRoamingForBrokenMobileSemantics() { device.net.brokenRoaming = true device.peers.RLock() for _, peer := range device.peers.keyMap { - peer.Lock() - peer.disableRoaming = peer.endpoint != nil - peer.Unlock() + peer.endpoint.Lock() + peer.endpoint.disableRoaming = peer.endpoint.val != nil + peer.endpoint.Unlock() } device.peers.RUnlock() } diff --git a/device/noise-helpers.go b/device/noise-helpers.go index b6b51fd..c2f356b 100644 --- a/device/noise-helpers.go +++ b/device/noise-helpers.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -9,6 +9,7 @@ import ( "crypto/hmac" "crypto/rand" "crypto/subtle" + "errors" "hash" "golang.org/x/crypto/blake2s" @@ -94,9 +95,14 @@ func (sk *NoisePrivateKey) publicKey() (pk NoisePublicKey) { return } -func (sk *NoisePrivateKey) sharedSecret(pk NoisePublicKey) (ss [NoisePublicKeySize]byte) { +var errInvalidPublicKey = errors.New("invalid public key") + +func (sk *NoisePrivateKey) sharedSecret(pk NoisePublicKey) (ss [NoisePublicKeySize]byte, err error) { apk := (*[NoisePublicKeySize]byte)(&pk) ask := (*[NoisePrivateKeySize]byte)(sk) curve25519.ScalarMult(&ss, ask, apk) - return ss + if isZero(ss[:]) { + return ss, errInvalidPublicKey + } + return ss, nil } diff --git a/device/noise-protocol.go b/device/noise-protocol.go index e31ceda..e8f6145 100644 --- a/device/noise-protocol.go +++ b/device/noise-protocol.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -138,11 +138,11 @@ var ( ZeroNonce [chacha20poly1305.NonceSize]byte ) -func mixKey(dst *[blake2s.Size]byte, c *[blake2s.Size]byte, data []byte) { +func mixKey(dst, c *[blake2s.Size]byte, data []byte) { KDF1(dst, c[:], data) } -func mixHash(dst *[blake2s.Size]byte, h *[blake2s.Size]byte, data []byte) { +func mixHash(dst, h *[blake2s.Size]byte, data []byte) { hash, _ := blake2s.New256(nil) hash.Write(h[:]) hash.Write(data) @@ -175,8 +175,6 @@ func init() { } func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, error) { - var errZeroECDHResult = errors.New("ECDH returned all zeros") - device.staticIdentity.RLock() defer device.staticIdentity.RUnlock() @@ -204,9 +202,9 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e handshake.mixHash(msg.Ephemeral[:]) // encrypt static key - ss := handshake.localEphemeral.sharedSecret(handshake.remoteStatic) - if isZero(ss[:]) { - return nil, errZeroECDHResult + ss, err := handshake.localEphemeral.sharedSecret(handshake.remoteStatic) + if err != nil { + return nil, err } var key [chacha20poly1305.KeySize]byte KDF2( @@ -221,7 +219,7 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e // encrypt timestamp if isZero(handshake.precomputedStaticStatic[:]) { - return nil, errZeroECDHResult + return nil, errInvalidPublicKey } KDF2( &handshake.chainKey, @@ -264,11 +262,10 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer { mixKey(&chainKey, &InitialChainKey, msg.Ephemeral[:]) // decrypt static key - var err error var peerPK NoisePublicKey var key [chacha20poly1305.KeySize]byte - ss := device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral) - if isZero(ss[:]) { + ss, err := device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral) + if err != nil { return nil } KDF2(&chainKey, &key, chainKey[:], ss[:]) @@ -282,7 +279,7 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer { // lookup peer peer := device.LookupPeer(peerPK) - if peer == nil || !peer.isRunning.Get() { + if peer == nil || !peer.isRunning.Load() { return nil } @@ -384,12 +381,16 @@ func (device *Device) CreateMessageResponse(peer *Peer) (*MessageResponse, error handshake.mixHash(msg.Ephemeral[:]) handshake.mixKey(msg.Ephemeral[:]) - func() { - ss := handshake.localEphemeral.sharedSecret(handshake.remoteEphemeral) - handshake.mixKey(ss[:]) - ss = handshake.localEphemeral.sharedSecret(handshake.remoteStatic) - handshake.mixKey(ss[:]) - }() + ss, err := handshake.localEphemeral.sharedSecret(handshake.remoteEphemeral) + if err != nil { + return nil, err + } + handshake.mixKey(ss[:]) + ss, err = handshake.localEphemeral.sharedSecret(handshake.remoteStatic) + if err != nil { + return nil, err + } + handshake.mixKey(ss[:]) // add preshared key @@ -406,11 +407,9 @@ func (device *Device) CreateMessageResponse(peer *Peer) (*MessageResponse, error handshake.mixHash(tau[:]) - func() { - aead, _ := chacha20poly1305.New(key[:]) - aead.Seal(msg.Empty[:0], ZeroNonce[:], nil, handshake.hash[:]) - handshake.mixHash(msg.Empty[:]) - }() + aead, _ := chacha20poly1305.New(key[:]) + aead.Seal(msg.Empty[:0], ZeroNonce[:], nil, handshake.hash[:]) + handshake.mixHash(msg.Empty[:]) handshake.state = handshakeResponseCreated @@ -436,7 +435,6 @@ func (device *Device) ConsumeMessageResponse(msg *MessageResponse) *Peer { ) ok := func() bool { - // lock handshake state handshake.mutex.RLock() @@ -456,17 +454,19 @@ func (device *Device) ConsumeMessageResponse(msg *MessageResponse) *Peer { mixHash(&hash, &handshake.hash, msg.Ephemeral[:]) mixKey(&chainKey, &handshake.chainKey, msg.Ephemeral[:]) - func() { - ss := handshake.localEphemeral.sharedSecret(msg.Ephemeral) - mixKey(&chainKey, &chainKey, ss[:]) - setZero(ss[:]) - }() + ss, err := handshake.localEphemeral.sharedSecret(msg.Ephemeral) + if err != nil { + return false + } + mixKey(&chainKey, &chainKey, ss[:]) + setZero(ss[:]) - func() { - ss := device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral) - mixKey(&chainKey, &chainKey, ss[:]) - setZero(ss[:]) - }() + ss, err = device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral) + if err != nil { + return false + } + mixKey(&chainKey, &chainKey, ss[:]) + setZero(ss[:]) // add preshared key (psk) @@ -484,7 +484,7 @@ func (device *Device) ConsumeMessageResponse(msg *MessageResponse) *Peer { // authenticate transcript aead, _ := chacha20poly1305.New(key[:]) - _, err := aead.Open(nil, ZeroNonce[:], msg.Empty[:], hash[:]) + _, err = aead.Open(nil, ZeroNonce[:], msg.Empty[:], hash[:]) if err != nil { return false } @@ -582,12 +582,12 @@ func (peer *Peer) BeginSymmetricSession() error { defer keypairs.Unlock() previous := keypairs.previous - next := keypairs.loadNext() + next := keypairs.next.Load() current := keypairs.current if isInitiator { if next != nil { - keypairs.storeNext(nil) + keypairs.next.Store(nil) keypairs.previous = next device.DeleteKeypair(current) } else { @@ -596,7 +596,7 @@ func (peer *Peer) BeginSymmetricSession() error { device.DeleteKeypair(previous) keypairs.current = keypair } else { - keypairs.storeNext(keypair) + keypairs.next.Store(keypair) device.DeleteKeypair(next) keypairs.previous = nil device.DeleteKeypair(previous) @@ -608,18 +608,18 @@ func (peer *Peer) BeginSymmetricSession() error { func (peer *Peer) ReceivedWithKeypair(receivedKeypair *Keypair) bool { keypairs := &peer.keypairs - if keypairs.loadNext() != receivedKeypair { + if keypairs.next.Load() != receivedKeypair { return false } keypairs.Lock() defer keypairs.Unlock() - if keypairs.loadNext() != receivedKeypair { + if keypairs.next.Load() != receivedKeypair { return false } old := keypairs.previous keypairs.previous = keypairs.current peer.device.DeleteKeypair(old) - keypairs.current = keypairs.loadNext() - keypairs.storeNext(nil) + keypairs.current = keypairs.next.Load() + keypairs.next.Store(nil) return true } diff --git a/device/noise-types.go b/device/noise-types.go index 6e850e7..e850359 100644 --- a/device/noise-types.go +++ b/device/noise-types.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/noise_test.go b/device/noise_test.go index e2f23c6..2dd5324 100644 --- a/device/noise_test.go +++ b/device/noise_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -24,10 +24,10 @@ func TestCurveWrappers(t *testing.T) { pk1 := sk1.publicKey() pk2 := sk2.publicKey() - ss1 := sk1.sharedSecret(pk2) - ss2 := sk2.sharedSecret(pk1) + ss1, err1 := sk1.sharedSecret(pk2) + ss2, err2 := sk2.sharedSecret(pk1) - if ss1 != ss2 { + if ss1 != ss2 || err1 != nil || err2 != nil { t.Fatal("Failed to compute shared secet") } } @@ -148,7 +148,7 @@ func TestNoiseHandshake(t *testing.T) { t.Fatal("failed to derive keypair for peer 2", err) } - key1 := peer1.keypairs.loadNext() + key1 := peer1.keypairs.next.Load() key2 := peer2.keypairs.current // encrypting / decryption test diff --git a/device/peer.go b/device/peer.go index 5bd52df..47a2f14 100644 --- a/device/peer.go +++ b/device/peer.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -16,36 +16,31 @@ import ( ) type Peer struct { - isRunning AtomicBool - sync.RWMutex // Mostly protects endpoint, but is generally taken whenever we modify peer - keypairs Keypairs - handshake Handshake - device *Device - endpoint conn.Endpoint - stopping sync.WaitGroup // routines pending stop - - // These fields are accessed with atomic operations, which must be - // 64-bit aligned even on 32-bit platforms. Go guarantees that an - // allocated struct will be 64-bit aligned. So we place - // atomically-accessed fields up front, so that they can share in - // this alignment before smaller fields throw it off. - stats struct { - txBytes uint64 // bytes send to peer (endpoint) - rxBytes uint64 // bytes received from peer - lastHandshakeNano int64 // nano seconds since epoch + isRunning atomic.Bool + keypairs Keypairs + handshake Handshake + device *Device + stopping sync.WaitGroup // routines pending stop + txBytes atomic.Uint64 // bytes send to peer (endpoint) + rxBytes atomic.Uint64 // bytes received from peer + lastHandshakeNano atomic.Int64 // nano seconds since epoch + + endpoint struct { + sync.Mutex + val conn.Endpoint + clearSrcOnTx bool // signal to val.ClearSrc() prior to next packet transmission + disableRoaming bool } - disableRoaming bool - timers struct { retransmitHandshake *Timer sendKeepalive *Timer newHandshake *Timer zeroKeyMaterial *Timer persistentKeepalive *Timer - handshakeAttempts uint32 - needAnotherKeepalive AtomicBool - sentLastMinuteHandshake AtomicBool + handshakeAttempts atomic.Uint32 + needAnotherKeepalive atomic.Bool + sentLastMinuteHandshake atomic.Bool } state struct { @@ -53,14 +48,14 @@ type Peer struct { } queue struct { - staged chan *QueueOutboundElement // staged packets before a handshake is available - outbound *autodrainingOutboundQueue // sequential ordering of udp transmission - inbound *autodrainingInboundQueue // sequential ordering of tun writing + staged chan *QueueOutboundElementsContainer // staged packets before a handshake is available + outbound *autodrainingOutboundQueue // sequential ordering of udp transmission + inbound *autodrainingInboundQueue // sequential ordering of tun writing } cookieGenerator CookieGenerator trieEntries list.List - persistentKeepaliveInterval uint32 // accessed atomically + persistentKeepaliveInterval atomic.Uint32 } func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) { @@ -82,14 +77,12 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) { // create peer peer := new(Peer) - peer.Lock() - defer peer.Unlock() peer.cookieGenerator.Init(pk) peer.device = device peer.queue.outbound = newAutodrainingOutboundQueue(device) peer.queue.inbound = newAutodrainingInboundQueue(device) - peer.queue.staged = make(chan *QueueOutboundElement, QueueStagedSize) + peer.queue.staged = make(chan *QueueOutboundElementsContainer, QueueStagedSize) // map public key _, ok := device.peers.keyMap[pk] @@ -100,12 +93,16 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) { // pre-compute DH handshake := &peer.handshake handshake.mutex.Lock() - handshake.precomputedStaticStatic = device.staticIdentity.privateKey.sharedSecret(pk) + handshake.precomputedStaticStatic, _ = device.staticIdentity.privateKey.sharedSecret(pk) handshake.remoteStatic = pk handshake.mutex.Unlock() // reset endpoint - peer.endpoint = nil + peer.endpoint.Lock() + peer.endpoint.val = nil + peer.endpoint.disableRoaming = false + peer.endpoint.clearSrcOnTx = false + peer.endpoint.Unlock() // init timers peer.timersInit() @@ -116,7 +113,7 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) { return peer, nil } -func (peer *Peer) SendBuffer(buffer []byte) error { +func (peer *Peer) SendBuffers(buffers [][]byte) error { peer.device.net.RLock() defer peer.device.net.RUnlock() @@ -124,16 +121,25 @@ func (peer *Peer) SendBuffer(buffer []byte) error { return nil } - peer.RLock() - defer peer.RUnlock() - - if peer.endpoint == nil { + peer.endpoint.Lock() + endpoint := peer.endpoint.val + if endpoint == nil { + peer.endpoint.Unlock() return errors.New("no known endpoint for peer") } + if peer.endpoint.clearSrcOnTx { + endpoint.ClearSrc() + peer.endpoint.clearSrcOnTx = false + } + peer.endpoint.Unlock() - err := peer.device.net.bind.Send(buffer, peer.endpoint) + err := peer.device.net.bind.Send(buffers, endpoint) if err == nil { - atomic.AddUint64(&peer.stats.txBytes, uint64(len(buffer))) + var totalLen uint64 + for _, b := range buffers { + totalLen += uint64(len(b)) + } + peer.txBytes.Add(totalLen) } return err } @@ -174,7 +180,7 @@ func (peer *Peer) Start() { peer.state.Lock() defer peer.state.Unlock() - if peer.isRunning.Get() { + if peer.isRunning.Load() { return } @@ -195,10 +201,14 @@ func (peer *Peer) Start() { device.flushInboundQueue(peer.queue.inbound) device.flushOutboundQueue(peer.queue.outbound) - go peer.RoutineSequentialSender() - go peer.RoutineSequentialReceiver() - peer.isRunning.Set(true) + // Use the device batch size, not the bind batch size, as the device size is + // the size of the batch pools. + batchSize := peer.device.BatchSize() + go peer.RoutineSequentialSender(batchSize) + go peer.RoutineSequentialReceiver(batchSize) + + peer.isRunning.Store(true) } func (peer *Peer) ZeroAndFlushAll() { @@ -210,10 +220,10 @@ func (peer *Peer) ZeroAndFlushAll() { keypairs.Lock() device.DeleteKeypair(keypairs.previous) device.DeleteKeypair(keypairs.current) - device.DeleteKeypair(keypairs.loadNext()) + device.DeleteKeypair(keypairs.next.Load()) keypairs.previous = nil keypairs.current = nil - keypairs.storeNext(nil) + keypairs.next.Store(nil) keypairs.Unlock() // clear handshake state @@ -238,11 +248,10 @@ func (peer *Peer) ExpireCurrentKeypairs() { keypairs := &peer.keypairs keypairs.Lock() if keypairs.current != nil { - atomic.StoreUint64(&keypairs.current.sendNonce, RejectAfterMessages) + keypairs.current.sendNonce.Store(RejectAfterMessages) } - if keypairs.next != nil { - next := keypairs.loadNext() - atomic.StoreUint64(&next.sendNonce, RejectAfterMessages) + if next := keypairs.next.Load(); next != nil { + next.sendNonce.Store(RejectAfterMessages) } keypairs.Unlock() } @@ -268,10 +277,20 @@ func (peer *Peer) Stop() { } func (peer *Peer) SetEndpointFromPacket(endpoint conn.Endpoint) { - if peer.disableRoaming { + peer.endpoint.Lock() + defer peer.endpoint.Unlock() + if peer.endpoint.disableRoaming { + return + } + peer.endpoint.clearSrcOnTx = false + peer.endpoint.val = endpoint +} + +func (peer *Peer) markEndpointSrcForClearing() { + peer.endpoint.Lock() + defer peer.endpoint.Unlock() + if peer.endpoint.val == nil { return } - peer.Lock() - peer.endpoint = endpoint - peer.Unlock() + peer.endpoint.clearSrcOnTx = true } diff --git a/device/pools.go b/device/pools.go index f1d1fa0..94f3dc7 100644 --- a/device/pools.go +++ b/device/pools.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -14,49 +14,85 @@ type WaitPool struct { pool sync.Pool cond sync.Cond lock sync.Mutex - count uint32 + count atomic.Uint32 max uint32 } -func NewWaitPool(max uint32, new func() interface{}) *WaitPool { +func NewWaitPool(max uint32, new func() any) *WaitPool { p := &WaitPool{pool: sync.Pool{New: new}, max: max} p.cond = sync.Cond{L: &p.lock} return p } -func (p *WaitPool) Get() interface{} { +func (p *WaitPool) Get() any { if p.max != 0 { p.lock.Lock() - for atomic.LoadUint32(&p.count) >= p.max { + for p.count.Load() >= p.max { p.cond.Wait() } - atomic.AddUint32(&p.count, 1) + p.count.Add(1) p.lock.Unlock() } return p.pool.Get() } -func (p *WaitPool) Put(x interface{}) { +func (p *WaitPool) Put(x any) { p.pool.Put(x) if p.max == 0 { return } - atomic.AddUint32(&p.count, ^uint32(0)) + p.count.Add(^uint32(0)) p.cond.Signal() } func (device *Device) PopulatePools() { - device.pool.messageBuffers = NewWaitPool(PreallocatedBuffersPerPool, func() interface{} { + device.pool.inboundElementsContainer = NewWaitPool(PreallocatedBuffersPerPool, func() any { + s := make([]*QueueInboundElement, 0, device.BatchSize()) + return &QueueInboundElementsContainer{elems: s} + }) + device.pool.outboundElementsContainer = NewWaitPool(PreallocatedBuffersPerPool, func() any { + s := make([]*QueueOutboundElement, 0, device.BatchSize()) + return &QueueOutboundElementsContainer{elems: s} + }) + device.pool.messageBuffers = NewWaitPool(PreallocatedBuffersPerPool, func() any { return new([MaxMessageSize]byte) }) - device.pool.inboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() interface{} { + device.pool.inboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any { return new(QueueInboundElement) }) - device.pool.outboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() interface{} { + device.pool.outboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any { return new(QueueOutboundElement) }) } +func (device *Device) GetInboundElementsContainer() *QueueInboundElementsContainer { + c := device.pool.inboundElementsContainer.Get().(*QueueInboundElementsContainer) + c.Mutex = sync.Mutex{} + return c +} + +func (device *Device) PutInboundElementsContainer(c *QueueInboundElementsContainer) { + for i := range c.elems { + c.elems[i] = nil + } + c.elems = c.elems[:0] + device.pool.inboundElementsContainer.Put(c) +} + +func (device *Device) GetOutboundElementsContainer() *QueueOutboundElementsContainer { + c := device.pool.outboundElementsContainer.Get().(*QueueOutboundElementsContainer) + c.Mutex = sync.Mutex{} + return c +} + +func (device *Device) PutOutboundElementsContainer(c *QueueOutboundElementsContainer) { + for i := range c.elems { + c.elems[i] = nil + } + c.elems = c.elems[:0] + device.pool.outboundElementsContainer.Put(c) +} + func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte { return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte) } diff --git a/device/pools_test.go b/device/pools_test.go index b0840e1..82d7493 100644 --- a/device/pools_test.go +++ b/device/pools_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -17,29 +17,31 @@ import ( func TestWaitPool(t *testing.T) { t.Skip("Currently disabled") var wg sync.WaitGroup - trials := int32(100000) + var trials atomic.Int32 + startTrials := int32(100000) if raceEnabled { // This test can be very slow with -race. - trials /= 10 + startTrials /= 10 } + trials.Store(startTrials) workers := runtime.NumCPU() + 2 if workers-4 <= 0 { t.Skip("Not enough cores") } - p := NewWaitPool(uint32(workers-4), func() interface{} { return make([]byte, 16) }) + p := NewWaitPool(uint32(workers-4), func() any { return make([]byte, 16) }) wg.Add(workers) - max := uint32(0) + var max atomic.Uint32 updateMax := func() { - count := atomic.LoadUint32(&p.count) + count := p.count.Load() if count > p.max { t.Errorf("count (%d) > max (%d)", count, p.max) } for { - old := atomic.LoadUint32(&max) + old := max.Load() if count <= old { break } - if atomic.CompareAndSwapUint32(&max, old, count) { + if max.CompareAndSwap(old, count) { break } } @@ -47,7 +49,7 @@ func TestWaitPool(t *testing.T) { for i := 0; i < workers; i++ { go func() { defer wg.Done() - for atomic.AddInt32(&trials, -1) > 0 { + for trials.Add(-1) > 0 { updateMax() x := p.Get() updateMax() @@ -59,25 +61,74 @@ func TestWaitPool(t *testing.T) { }() } wg.Wait() - if max != p.max { + if max.Load() != p.max { t.Errorf("Actual maximum count (%d) != ideal maximum count (%d)", max, p.max) } } func BenchmarkWaitPool(b *testing.B) { var wg sync.WaitGroup - trials := int32(b.N) + var trials atomic.Int32 + trials.Store(int32(b.N)) workers := runtime.NumCPU() + 2 if workers-4 <= 0 { b.Skip("Not enough cores") } - p := NewWaitPool(uint32(workers-4), func() interface{} { return make([]byte, 16) }) + p := NewWaitPool(uint32(workers-4), func() any { return make([]byte, 16) }) wg.Add(workers) b.ResetTimer() for i := 0; i < workers; i++ { go func() { defer wg.Done() - for atomic.AddInt32(&trials, -1) > 0 { + for trials.Add(-1) > 0 { + x := p.Get() + time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond) + p.Put(x) + } + }() + } + wg.Wait() +} + +func BenchmarkWaitPoolEmpty(b *testing.B) { + var wg sync.WaitGroup + var trials atomic.Int32 + trials.Store(int32(b.N)) + workers := runtime.NumCPU() + 2 + if workers-4 <= 0 { + b.Skip("Not enough cores") + } + p := NewWaitPool(0, func() any { return make([]byte, 16) }) + wg.Add(workers) + b.ResetTimer() + for i := 0; i < workers; i++ { + go func() { + defer wg.Done() + for trials.Add(-1) > 0 { + x := p.Get() + time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond) + p.Put(x) + } + }() + } + wg.Wait() +} + +func BenchmarkSyncPool(b *testing.B) { + var wg sync.WaitGroup + var trials atomic.Int32 + trials.Store(int32(b.N)) + workers := runtime.NumCPU() + 2 + if workers-4 <= 0 { + b.Skip("Not enough cores") + } + p := sync.Pool{New: func() any { return make([]byte, 16) }} + wg.Add(workers) + b.ResetTimer() + for i := 0; i < workers; i++ { + go func() { + defer wg.Done() + for trials.Add(-1) > 0 { x := p.Get() time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond) p.Put(x) diff --git a/device/queueconstants_android.go b/device/queueconstants_android.go index 7abc33a..25f700a 100644 --- a/device/queueconstants_android.go +++ b/device/queueconstants_android.go @@ -1,17 +1,19 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device +import "golang.zx2c4.com/wireguard/conn" + /* Reduce memory consumption for Android */ const ( - QueueStagedSize = 128 + QueueStagedSize = conn.IdealBatchSize QueueOutboundSize = 1024 QueueInboundSize = 1024 QueueHandshakeSize = 1024 - MaxSegmentSize = 2200 + MaxSegmentSize = (1 << 16) - 1 // largest possible UDP datagram PreallocatedBuffersPerPool = 4096 ) diff --git a/device/queueconstants_default.go b/device/queueconstants_default.go index 66ef600..ea763d0 100644 --- a/device/queueconstants_default.go +++ b/device/queueconstants_default.go @@ -2,13 +2,15 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device +import "golang.zx2c4.com/wireguard/conn" + const ( - QueueStagedSize = 128 + QueueStagedSize = conn.IdealBatchSize QueueOutboundSize = 1024 QueueInboundSize = 1024 QueueHandshakeSize = 1024 diff --git a/device/queueconstants_ios.go b/device/queueconstants_ios.go index 854e4c2..acd3cec 100644 --- a/device/queueconstants_ios.go +++ b/device/queueconstants_ios.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/queueconstants_windows.go b/device/queueconstants_windows.go index e330a6b..1eee32b 100644 --- a/device/queueconstants_windows.go +++ b/device/queueconstants_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/race_disabled_test.go b/device/race_disabled_test.go index b3db3a1..bb5c450 100644 --- a/device/race_disabled_test.go +++ b/device/race_disabled_test.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/race_enabled_test.go b/device/race_enabled_test.go index 1565100..4e9daea 100644 --- a/device/race_enabled_test.go +++ b/device/race_enabled_test.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device diff --git a/device/receive.go b/device/receive.go index cc34498..1ab3e29 100644 --- a/device/receive.go +++ b/device/receive.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -11,7 +11,6 @@ import ( "errors" "net" "sync" - "sync/atomic" "time" "golang.org/x/crypto/chacha20poly1305" @@ -28,7 +27,6 @@ type QueueHandshakeElement struct { } type QueueInboundElement struct { - sync.Mutex buffer *[MaxMessageSize]byte packet []byte counter uint64 @@ -36,6 +34,11 @@ type QueueInboundElement struct { endpoint conn.Endpoint } +type QueueInboundElementsContainer struct { + sync.Mutex + elems []*QueueInboundElement +} + // clearPointers clears elem fields that contain pointers. // This makes the garbage collector's life easier and // avoids accidentally keeping other objects around unnecessarily. @@ -52,12 +55,12 @@ func (elem *QueueInboundElement) clearPointers() { * NOTE: Not thread safe, but called by sequential receiver! */ func (peer *Peer) keepKeyFreshReceiving() { - if peer.timers.sentLastMinuteHandshake.Get() { + if peer.timers.sentLastMinuteHandshake.Load() { return } keypair := peer.keypairs.Current() if keypair != nil && keypair.isInitiator && time.Since(keypair.created) > (RejectAfterTime-KeepaliveTimeout-RekeyTimeout) { - peer.timers.sentLastMinuteHandshake.Set(true) + peer.timers.sentLastMinuteHandshake.Store(true) peer.SendHandshakeInitiation(false) } } @@ -67,7 +70,7 @@ func (peer *Peer) keepKeyFreshReceiving() { * Every time the bind is updated a new routine is started for * IPv4 and IPv6 (separately) */ -func (device *Device) RoutineReceiveIncoming(recv conn.ReceiveFunc) { +func (device *Device) RoutineReceiveIncoming(maxBatchSize int, recv conn.ReceiveFunc) { recvName := recv.PrettyName() defer func() { device.log.Verbosef("Routine: receive incoming %s - stopped", recvName) @@ -80,20 +83,33 @@ func (device *Device) RoutineReceiveIncoming(recv conn.ReceiveFunc) { // receive datagrams until conn is closed - buffer := device.GetMessageBuffer() - var ( + bufsArrs = make([]*[MaxMessageSize]byte, maxBatchSize) + bufs = make([][]byte, maxBatchSize) err error - size int - endpoint conn.Endpoint + sizes = make([]int, maxBatchSize) + count int + endpoints = make([]conn.Endpoint, maxBatchSize) deathSpiral int + elemsByPeer = make(map[*Peer]*QueueInboundElementsContainer, maxBatchSize) ) - for { - size, endpoint, err = recv(buffer[:]) + for i := range bufsArrs { + bufsArrs[i] = device.GetMessageBuffer() + bufs[i] = bufsArrs[i][:] + } + + defer func() { + for i := 0; i < maxBatchSize; i++ { + if bufsArrs[i] != nil { + device.PutMessageBuffer(bufsArrs[i]) + } + } + }() + for { + count, err = recv(bufs, sizes, endpoints) if err != nil { - device.PutMessageBuffer(buffer) if errors.Is(err, net.ErrClosed) { return } @@ -104,101 +120,119 @@ func (device *Device) RoutineReceiveIncoming(recv conn.ReceiveFunc) { if deathSpiral < 10 { deathSpiral++ time.Sleep(time.Second / 3) - buffer = device.GetMessageBuffer() continue } return } deathSpiral = 0 - if size < MinMessageSize { - continue - } + // handle each packet in the batch + for i, size := range sizes[:count] { + if size < MinMessageSize { + continue + } - // check size of packet + // check size of packet - packet := buffer[:size] - msgType := binary.LittleEndian.Uint32(packet[:4]) + packet := bufsArrs[i][:size] + msgType := binary.LittleEndian.Uint32(packet[:4]) - var okay bool + switch msgType { - switch msgType { + // check if transport - // check if transport + case MessageTransportType: - case MessageTransportType: + // check size - // check size + if len(packet) < MessageTransportSize { + continue + } - if len(packet) < MessageTransportSize { - continue - } + // lookup key pair - // lookup key pair + receiver := binary.LittleEndian.Uint32( + packet[MessageTransportOffsetReceiver:MessageTransportOffsetCounter], + ) + value := device.indexTable.Lookup(receiver) + keypair := value.keypair + if keypair == nil { + continue + } - receiver := binary.LittleEndian.Uint32( - packet[MessageTransportOffsetReceiver:MessageTransportOffsetCounter], - ) - value := device.indexTable.Lookup(receiver) - keypair := value.keypair - if keypair == nil { - continue - } + // check keypair expiry - // check keypair expiry + if keypair.created.Add(RejectAfterTime).Before(time.Now()) { + continue + } - if keypair.created.Add(RejectAfterTime).Before(time.Now()) { + // create work element + peer := value.peer + elem := device.GetInboundElement() + elem.packet = packet + elem.buffer = bufsArrs[i] + elem.keypair = keypair + elem.endpoint = endpoints[i] + elem.counter = 0 + + elemsForPeer, ok := elemsByPeer[peer] + if !ok { + elemsForPeer = device.GetInboundElementsContainer() + elemsForPeer.Lock() + elemsByPeer[peer] = elemsForPeer + } + elemsForPeer.elems = append(elemsForPeer.elems, elem) + bufsArrs[i] = device.GetMessageBuffer() + bufs[i] = bufsArrs[i][:] continue - } - - // create work element - peer := value.peer - elem := device.GetInboundElement() - elem.packet = packet - elem.buffer = buffer - elem.keypair = keypair - elem.endpoint = endpoint - elem.counter = 0 - elem.Mutex = sync.Mutex{} - elem.Lock() - - // add to decryption queues - if peer.isRunning.Get() { - peer.queue.inbound.c <- elem - device.queue.decryption.c <- elem - buffer = device.GetMessageBuffer() - } else { - device.PutInboundElement(elem) - } - continue - // otherwise it is a fixed size & handshake related packet + // otherwise it is a fixed size & handshake related packet - case MessageInitiationType: - okay = len(packet) == MessageInitiationSize + case MessageInitiationType: + if len(packet) != MessageInitiationSize { + continue + } - case MessageResponseType: - okay = len(packet) == MessageResponseSize + case MessageResponseType: + if len(packet) != MessageResponseSize { + continue + } - case MessageCookieReplyType: - okay = len(packet) == MessageCookieReplySize + case MessageCookieReplyType: + if len(packet) != MessageCookieReplySize { + continue + } - default: - device.log.Verbosef("Received message with unknown type") - } + default: + device.log.Verbosef("Received message with unknown type") + continue + } - if okay { select { case device.queue.handshake.c <- QueueHandshakeElement{ msgType: msgType, - buffer: buffer, + buffer: bufsArrs[i], packet: packet, - endpoint: endpoint, + endpoint: endpoints[i], }: - buffer = device.GetMessageBuffer() + bufsArrs[i] = device.GetMessageBuffer() + bufs[i] = bufsArrs[i][:] default: } } + for peer, elemsContainer := range elemsByPeer { + if peer.isRunning.Load() { + peer.queue.inbound.c <- elemsContainer + device.queue.decryption.c <- elemsContainer + } else { + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutInboundElement(elem) + } + device.PutInboundElementsContainer(elemsContainer) + } + delete(elemsByPeer, peer) + } } } @@ -208,26 +242,28 @@ func (device *Device) RoutineDecryption(id int) { defer device.log.Verbosef("Routine: decryption worker %d - stopped", id) device.log.Verbosef("Routine: decryption worker %d - started", id) - for elem := range device.queue.decryption.c { - // split message into fields - counter := elem.packet[MessageTransportOffsetCounter:MessageTransportOffsetContent] - content := elem.packet[MessageTransportOffsetContent:] - - // decrypt and release to consumer - var err error - elem.counter = binary.LittleEndian.Uint64(counter) - // copy counter to nonce - binary.LittleEndian.PutUint64(nonce[0x4:0xc], elem.counter) - elem.packet, err = elem.keypair.receive.Open( - content[:0], - nonce[:], - content, - nil, - ) - if err != nil { - elem.packet = nil + for elemsContainer := range device.queue.decryption.c { + for _, elem := range elemsContainer.elems { + // split message into fields + counter := elem.packet[MessageTransportOffsetCounter:MessageTransportOffsetContent] + content := elem.packet[MessageTransportOffsetContent:] + + // decrypt and release to consumer + var err error + elem.counter = binary.LittleEndian.Uint64(counter) + // copy counter to nonce + binary.LittleEndian.PutUint64(nonce[0x4:0xc], elem.counter) + elem.packet, err = elem.keypair.receive.Open( + content[:0], + nonce[:], + content, + nil, + ) + if err != nil { + elem.packet = nil + } } - elem.Unlock() + elemsContainer.Unlock() } } @@ -268,7 +304,7 @@ func (device *Device) RoutineHandshake(id int) { // consume reply - if peer := entry.peer; peer.isRunning.Get() { + if peer := entry.peer; peer.isRunning.Load() { device.log.Verbosef("Receiving cookie response from %s", elem.endpoint.DstToString()) if !peer.cookieGenerator.ConsumeReply(&reply) { device.log.Verbosef("Could not decrypt invalid cookie response") @@ -341,7 +377,7 @@ func (device *Device) RoutineHandshake(id int) { peer.SetEndpointFromPacket(elem.endpoint) device.log.Verbosef("%v - Received handshake initiation", peer) - atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet))) + peer.rxBytes.Add(uint64(len(elem.packet))) peer.SendHandshakeResponse() @@ -369,7 +405,7 @@ func (device *Device) RoutineHandshake(id int) { peer.SetEndpointFromPacket(elem.endpoint) device.log.Verbosef("%v - Received handshake response", peer) - atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet))) + peer.rxBytes.Add(uint64(len(elem.packet))) // update timers @@ -394,7 +430,7 @@ func (device *Device) RoutineHandshake(id int) { } } -func (peer *Peer) RoutineSequentialReceiver() { +func (peer *Peer) RoutineSequentialReceiver(maxBatchSize int) { device := peer.device defer func() { device.log.Verbosef("%v - Routine: sequential receiver - stopped", peer) @@ -402,89 +438,103 @@ func (peer *Peer) RoutineSequentialReceiver() { }() device.log.Verbosef("%v - Routine: sequential receiver - started", peer) - for elem := range peer.queue.inbound.c { - if elem == nil { + bufs := make([][]byte, 0, maxBatchSize) + + for elemsContainer := range peer.queue.inbound.c { + if elemsContainer == nil { return } - var err error - elem.Lock() - if elem.packet == nil { - // decryption failed - goto skip - } + elemsContainer.Lock() + validTailPacket := -1 + dataPacketReceived := false + rxBytesLen := uint64(0) + for i, elem := range elemsContainer.elems { + if elem.packet == nil { + // decryption failed + continue + } - if !elem.keypair.replayFilter.ValidateCounter(elem.counter, RejectAfterMessages) { - goto skip - } + if !elem.keypair.replayFilter.ValidateCounter(elem.counter, RejectAfterMessages) { + continue + } - peer.SetEndpointFromPacket(elem.endpoint) - if peer.ReceivedWithKeypair(elem.keypair) { - peer.timersHandshakeComplete() - peer.SendStagedPackets() - } + validTailPacket = i + if peer.ReceivedWithKeypair(elem.keypair) { + peer.SetEndpointFromPacket(elem.endpoint) + peer.timersHandshakeComplete() + peer.SendStagedPackets() + } + rxBytesLen += uint64(len(elem.packet) + MinMessageSize) - peer.keepKeyFreshReceiving() - peer.timersAnyAuthenticatedPacketTraversal() - peer.timersAnyAuthenticatedPacketReceived() - atomic.AddUint64(&peer.stats.rxBytes, uint64(len(elem.packet)+MinMessageSize)) + if len(elem.packet) == 0 { + device.log.Verbosef("%v - Receiving keepalive packet", peer) + continue + } + dataPacketReceived = true - if len(elem.packet) == 0 { - device.log.Verbosef("%v - Receiving keepalive packet", peer) - goto skip - } - peer.timersDataReceived() + switch elem.packet[0] >> 4 { + case 4: + if len(elem.packet) < ipv4.HeaderLen { + continue + } + field := elem.packet[IPv4offsetTotalLength : IPv4offsetTotalLength+2] + length := binary.BigEndian.Uint16(field) + if int(length) > len(elem.packet) || int(length) < ipv4.HeaderLen { + continue + } + elem.packet = elem.packet[:length] + src := elem.packet[IPv4offsetSrc : IPv4offsetSrc+net.IPv4len] + if device.allowedips.Lookup(src) != peer { + device.log.Verbosef("IPv4 packet with disallowed source address from %v", peer) + continue + } - switch elem.packet[0] >> 4 { - case ipv4.Version: - if len(elem.packet) < ipv4.HeaderLen { - goto skip - } - field := elem.packet[IPv4offsetTotalLength : IPv4offsetTotalLength+2] - length := binary.BigEndian.Uint16(field) - if int(length) > len(elem.packet) || int(length) < ipv4.HeaderLen { - goto skip - } - elem.packet = elem.packet[:length] - src := elem.packet[IPv4offsetSrc : IPv4offsetSrc+net.IPv4len] - if device.allowedips.Lookup(src) != peer { - device.log.Verbosef("IPv4 packet with disallowed source address from %v", peer) - goto skip - } + case 6: + if len(elem.packet) < ipv6.HeaderLen { + continue + } + field := elem.packet[IPv6offsetPayloadLength : IPv6offsetPayloadLength+2] + length := binary.BigEndian.Uint16(field) + length += ipv6.HeaderLen + if int(length) > len(elem.packet) { + continue + } + elem.packet = elem.packet[:length] + src := elem.packet[IPv6offsetSrc : IPv6offsetSrc+net.IPv6len] + if device.allowedips.Lookup(src) != peer { + device.log.Verbosef("IPv6 packet with disallowed source address from %v", peer) + continue + } - case ipv6.Version: - if len(elem.packet) < ipv6.HeaderLen { - goto skip - } - field := elem.packet[IPv6offsetPayloadLength : IPv6offsetPayloadLength+2] - length := binary.BigEndian.Uint16(field) - length += ipv6.HeaderLen - if int(length) > len(elem.packet) { - goto skip - } - elem.packet = elem.packet[:length] - src := elem.packet[IPv6offsetSrc : IPv6offsetSrc+net.IPv6len] - if device.allowedips.Lookup(src) != peer { - device.log.Verbosef("IPv6 packet with disallowed source address from %v", peer) - goto skip + default: + device.log.Verbosef("Packet with invalid IP version from %v", peer) + continue } - default: - device.log.Verbosef("Packet with invalid IP version from %v", peer) - goto skip + bufs = append(bufs, elem.buffer[:MessageTransportOffsetContent+len(elem.packet)]) } - _, err = device.tun.device.Write(elem.buffer[:MessageTransportOffsetContent+len(elem.packet)], MessageTransportOffsetContent) - if err != nil && !device.isClosed() { - device.log.Errorf("Failed to write packet to TUN device: %v", err) + peer.rxBytes.Add(rxBytesLen) + if validTailPacket >= 0 { + peer.SetEndpointFromPacket(elemsContainer.elems[validTailPacket].endpoint) + peer.keepKeyFreshReceiving() + peer.timersAnyAuthenticatedPacketTraversal() + peer.timersAnyAuthenticatedPacketReceived() } - if len(peer.queue.inbound.c) == 0 { - err = device.tun.device.Flush() - if err != nil { - peer.device.log.Errorf("Unable to flush packets: %v", err) + if dataPacketReceived { + peer.timersDataReceived() + } + if len(bufs) > 0 { + _, err := device.tun.device.Write(bufs, MessageTransportOffsetContent) + if err != nil && !device.isClosed() { + device.log.Errorf("Failed to write packets to TUN device: %v", err) } } - skip: - device.PutMessageBuffer(elem.buffer) - device.PutInboundElement(elem) + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutInboundElement(elem) + } + bufs = bufs[:0] + device.PutInboundElementsContainer(elemsContainer) } } diff --git a/device/send.go b/device/send.go index b05c69e..769720a 100644 --- a/device/send.go +++ b/device/send.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -12,12 +12,13 @@ import ( "net" "os" "sync" - "sync/atomic" "time" "golang.org/x/crypto/chacha20poly1305" "golang.org/x/net/ipv4" "golang.org/x/net/ipv6" + "golang.zx2c4.com/wireguard/conn" + "golang.zx2c4.com/wireguard/tun" ) /* Outbound flow @@ -45,7 +46,6 @@ import ( */ type QueueOutboundElement struct { - sync.Mutex buffer *[MaxMessageSize]byte // slice holding the packet data packet []byte // slice of "buffer" (always!) nonce uint64 // nonce for encryption @@ -53,10 +53,14 @@ type QueueOutboundElement struct { peer *Peer // related peer } +type QueueOutboundElementsContainer struct { + sync.Mutex + elems []*QueueOutboundElement +} + func (device *Device) NewOutboundElement() *QueueOutboundElement { elem := device.GetOutboundElement() elem.buffer = device.GetMessageBuffer() - elem.Mutex = sync.Mutex{} elem.nonce = 0 // keypair and peer were cleared (if necessary) by clearPointers. return elem @@ -76,14 +80,17 @@ func (elem *QueueOutboundElement) clearPointers() { /* Queues a keepalive if no packets are queued for peer */ func (peer *Peer) SendKeepalive() { - if len(peer.queue.staged) == 0 && peer.isRunning.Get() { + if len(peer.queue.staged) == 0 && peer.isRunning.Load() { elem := peer.device.NewOutboundElement() + elemsContainer := peer.device.GetOutboundElementsContainer() + elemsContainer.elems = append(elemsContainer.elems, elem) select { - case peer.queue.staged <- elem: + case peer.queue.staged <- elemsContainer: peer.device.log.Verbosef("%v - Sending keepalive packet", peer) default: peer.device.PutMessageBuffer(elem.buffer) peer.device.PutOutboundElement(elem) + peer.device.PutOutboundElementsContainer(elemsContainer) } } peer.SendStagedPackets() @@ -91,7 +98,7 @@ func (peer *Peer) SendKeepalive() { func (peer *Peer) SendHandshakeInitiation(isRetry bool) error { if !isRetry { - atomic.StoreUint32(&peer.timers.handshakeAttempts, 0) + peer.timers.handshakeAttempts.Store(0) } peer.handshake.mutex.RLock() @@ -117,8 +124,8 @@ func (peer *Peer) SendHandshakeInitiation(isRetry bool) error { return err } - var buff [MessageInitiationSize]byte - writer := bytes.NewBuffer(buff[:0]) + var buf [MessageInitiationSize]byte + writer := bytes.NewBuffer(buf[:0]) binary.Write(writer, binary.LittleEndian, msg) packet := writer.Bytes() peer.cookieGenerator.AddMacs(packet) @@ -126,7 +133,7 @@ func (peer *Peer) SendHandshakeInitiation(isRetry bool) error { peer.timersAnyAuthenticatedPacketTraversal() peer.timersAnyAuthenticatedPacketSent() - err = peer.SendBuffer(packet) + err = peer.SendBuffers([][]byte{packet}) if err != nil { peer.device.log.Errorf("%v - Failed to send handshake initiation: %v", peer, err) } @@ -148,8 +155,8 @@ func (peer *Peer) SendHandshakeResponse() error { return err } - var buff [MessageResponseSize]byte - writer := bytes.NewBuffer(buff[:0]) + var buf [MessageResponseSize]byte + writer := bytes.NewBuffer(buf[:0]) binary.Write(writer, binary.LittleEndian, response) packet := writer.Bytes() peer.cookieGenerator.AddMacs(packet) @@ -164,7 +171,8 @@ func (peer *Peer) SendHandshakeResponse() error { peer.timersAnyAuthenticatedPacketTraversal() peer.timersAnyAuthenticatedPacketSent() - err = peer.SendBuffer(packet) + // TODO: allocation could be avoided + err = peer.SendBuffers([][]byte{packet}) if err != nil { peer.device.log.Errorf("%v - Failed to send handshake response: %v", peer, err) } @@ -181,10 +189,11 @@ func (device *Device) SendHandshakeCookie(initiatingElem *QueueHandshakeElement) return err } - var buff [MessageCookieReplySize]byte - writer := bytes.NewBuffer(buff[:0]) + var buf [MessageCookieReplySize]byte + writer := bytes.NewBuffer(buf[:0]) binary.Write(writer, binary.LittleEndian, reply) - device.net.bind.Send(writer.Bytes(), initiatingElem.endpoint) + // TODO: allocation could be avoided + device.net.bind.Send([][]byte{writer.Bytes()}, initiatingElem.endpoint) return nil } @@ -193,17 +202,12 @@ func (peer *Peer) keepKeyFreshSending() { if keypair == nil { return } - nonce := atomic.LoadUint64(&keypair.sendNonce) + nonce := keypair.sendNonce.Load() if nonce > RekeyAfterMessages || (keypair.isInitiator && time.Since(keypair.created) > RekeyAfterTime) { peer.SendHandshakeInitiation(false) } } -/* Reads packets from the TUN and inserts - * into staged queue for peer - * - * Obs. Single instance per TUN device - */ func (device *Device) RoutineReadFromTUN() { defer func() { device.log.Verbosef("Routine: TUN reader - stopped") @@ -213,82 +217,123 @@ func (device *Device) RoutineReadFromTUN() { device.log.Verbosef("Routine: TUN reader - started") - var elem *QueueOutboundElement + var ( + batchSize = device.BatchSize() + readErr error + elems = make([]*QueueOutboundElement, batchSize) + bufs = make([][]byte, batchSize) + elemsByPeer = make(map[*Peer]*QueueOutboundElementsContainer, batchSize) + count = 0 + sizes = make([]int, batchSize) + offset = MessageTransportHeaderSize + ) + + for i := range elems { + elems[i] = device.NewOutboundElement() + bufs[i] = elems[i].buffer[:] + } - for { - if elem != nil { - device.PutMessageBuffer(elem.buffer) - device.PutOutboundElement(elem) + defer func() { + for _, elem := range elems { + if elem != nil { + device.PutMessageBuffer(elem.buffer) + device.PutOutboundElement(elem) + } } - elem = device.NewOutboundElement() - - // read packet - - offset := MessageTransportHeaderSize - size, err := device.tun.device.Read(elem.buffer[:], offset) + }() - if err != nil { - if !device.isClosed() { - if !errors.Is(err, os.ErrClosed) { - device.log.Errorf("Failed to read packet from TUN device: %v", err) - } - go device.Close() + for { + // read packets + count, readErr = device.tun.device.Read(bufs, sizes, offset) + for i := 0; i < count; i++ { + if sizes[i] < 1 { + continue } - device.PutMessageBuffer(elem.buffer) - device.PutOutboundElement(elem) - return - } - if size == 0 || size > MaxContentSize { - continue - } + elem := elems[i] + elem.packet = bufs[i][offset : offset+sizes[i]] - elem.packet = elem.buffer[offset : offset+size] + // lookup peer + var peer *Peer + switch elem.packet[0] >> 4 { + case 4: + if len(elem.packet) < ipv4.HeaderLen { + continue + } + dst := elem.packet[IPv4offsetDst : IPv4offsetDst+net.IPv4len] + peer = device.allowedips.Lookup(dst) - // lookup peer + case 6: + if len(elem.packet) < ipv6.HeaderLen { + continue + } + dst := elem.packet[IPv6offsetDst : IPv6offsetDst+net.IPv6len] + peer = device.allowedips.Lookup(dst) - var peer *Peer - switch elem.packet[0] >> 4 { - case ipv4.Version: - if len(elem.packet) < ipv4.HeaderLen { - continue + default: + device.log.Verbosef("Received packet with unknown IP version") } - dst := elem.packet[IPv4offsetDst : IPv4offsetDst+net.IPv4len] - peer = device.allowedips.Lookup(dst) - case ipv6.Version: - if len(elem.packet) < ipv6.HeaderLen { + if peer == nil { continue } - dst := elem.packet[IPv6offsetDst : IPv6offsetDst+net.IPv6len] - peer = device.allowedips.Lookup(dst) - - default: - device.log.Verbosef("Received packet with unknown IP version") + elemsForPeer, ok := elemsByPeer[peer] + if !ok { + elemsForPeer = device.GetOutboundElementsContainer() + elemsByPeer[peer] = elemsForPeer + } + elemsForPeer.elems = append(elemsForPeer.elems, elem) + elems[i] = device.NewOutboundElement() + bufs[i] = elems[i].buffer[:] } - if peer == nil { - continue + for peer, elemsForPeer := range elemsByPeer { + if peer.isRunning.Load() { + peer.StagePackets(elemsForPeer) + peer.SendStagedPackets() + } else { + for _, elem := range elemsForPeer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutOutboundElement(elem) + } + device.PutOutboundElementsContainer(elemsForPeer) + } + delete(elemsByPeer, peer) } - if peer.isRunning.Get() { - peer.StagePacket(elem) - elem = nil - peer.SendStagedPackets() + + if readErr != nil { + if errors.Is(readErr, tun.ErrTooManySegments) { + // TODO: record stat for this + // This will happen if MSS is surprisingly small (< 576) + // coincident with reasonably high throughput. + device.log.Verbosef("Dropped some packets from multi-segment read: %v", readErr) + continue + } + if !device.isClosed() { + if !errors.Is(readErr, os.ErrClosed) { + device.log.Errorf("Failed to read packet from TUN device: %v", readErr) + } + go device.Close() + } + return } } } -func (peer *Peer) StagePacket(elem *QueueOutboundElement) { +func (peer *Peer) StagePackets(elems *QueueOutboundElementsContainer) { for { select { - case peer.queue.staged <- elem: + case peer.queue.staged <- elems: return default: } select { case tooOld := <-peer.queue.staged: - peer.device.PutMessageBuffer(tooOld.buffer) - peer.device.PutOutboundElement(tooOld) + for _, elem := range tooOld.elems { + peer.device.PutMessageBuffer(elem.buffer) + peer.device.PutOutboundElement(elem) + } + peer.device.PutOutboundElementsContainer(tooOld) default: } } @@ -301,32 +346,59 @@ top: } keypair := peer.keypairs.Current() - if keypair == nil || atomic.LoadUint64(&keypair.sendNonce) >= RejectAfterMessages || time.Since(keypair.created) >= RejectAfterTime { + if keypair == nil || keypair.sendNonce.Load() >= RejectAfterMessages || time.Since(keypair.created) >= RejectAfterTime { peer.SendHandshakeInitiation(false) return } for { + var elemsContainerOOO *QueueOutboundElementsContainer select { - case elem := <-peer.queue.staged: - elem.peer = peer - elem.nonce = atomic.AddUint64(&keypair.sendNonce, 1) - 1 - if elem.nonce >= RejectAfterMessages { - atomic.StoreUint64(&keypair.sendNonce, RejectAfterMessages) - peer.StagePacket(elem) // XXX: Out of order, but we can't front-load go chans - goto top + case elemsContainer := <-peer.queue.staged: + i := 0 + for _, elem := range elemsContainer.elems { + elem.peer = peer + elem.nonce = keypair.sendNonce.Add(1) - 1 + if elem.nonce >= RejectAfterMessages { + keypair.sendNonce.Store(RejectAfterMessages) + if elemsContainerOOO == nil { + elemsContainerOOO = peer.device.GetOutboundElementsContainer() + } + elemsContainerOOO.elems = append(elemsContainerOOO.elems, elem) + continue + } else { + elemsContainer.elems[i] = elem + i++ + } + + elem.keypair = keypair } + elemsContainer.Lock() + elemsContainer.elems = elemsContainer.elems[:i] - elem.keypair = keypair - elem.Lock() + if elemsContainerOOO != nil { + peer.StagePackets(elemsContainerOOO) // XXX: Out of order, but we can't front-load go chans + } + + if len(elemsContainer.elems) == 0 { + peer.device.PutOutboundElementsContainer(elemsContainer) + goto top + } // add to parallel and sequential queue - if peer.isRunning.Get() { - peer.queue.outbound.c <- elem - peer.device.queue.encryption.c <- elem + if peer.isRunning.Load() { + peer.queue.outbound.c <- elemsContainer + peer.device.queue.encryption.c <- elemsContainer } else { - peer.device.PutMessageBuffer(elem.buffer) - peer.device.PutOutboundElement(elem) + for _, elem := range elemsContainer.elems { + peer.device.PutMessageBuffer(elem.buffer) + peer.device.PutOutboundElement(elem) + } + peer.device.PutOutboundElementsContainer(elemsContainer) + } + + if elemsContainerOOO != nil { + goto top } default: return @@ -337,9 +409,12 @@ top: func (peer *Peer) FlushStagedPackets() { for { select { - case elem := <-peer.queue.staged: - peer.device.PutMessageBuffer(elem.buffer) - peer.device.PutOutboundElement(elem) + case elemsContainer := <-peer.queue.staged: + for _, elem := range elemsContainer.elems { + peer.device.PutMessageBuffer(elem.buffer) + peer.device.PutOutboundElement(elem) + } + peer.device.PutOutboundElementsContainer(elemsContainer) default: return } @@ -373,41 +448,38 @@ func (device *Device) RoutineEncryption(id int) { defer device.log.Verbosef("Routine: encryption worker %d - stopped", id) device.log.Verbosef("Routine: encryption worker %d - started", id) - for elem := range device.queue.encryption.c { - // populate header fields - header := elem.buffer[:MessageTransportHeaderSize] + for elemsContainer := range device.queue.encryption.c { + for _, elem := range elemsContainer.elems { + // populate header fields + header := elem.buffer[:MessageTransportHeaderSize] - fieldType := header[0:4] - fieldReceiver := header[4:8] - fieldNonce := header[8:16] + fieldType := header[0:4] + fieldReceiver := header[4:8] + fieldNonce := header[8:16] - binary.LittleEndian.PutUint32(fieldType, MessageTransportType) - binary.LittleEndian.PutUint32(fieldReceiver, elem.keypair.remoteIndex) - binary.LittleEndian.PutUint64(fieldNonce, elem.nonce) + binary.LittleEndian.PutUint32(fieldType, MessageTransportType) + binary.LittleEndian.PutUint32(fieldReceiver, elem.keypair.remoteIndex) + binary.LittleEndian.PutUint64(fieldNonce, elem.nonce) - // pad content to multiple of 16 - paddingSize := calculatePaddingSize(len(elem.packet), int(atomic.LoadInt32(&device.tun.mtu))) - elem.packet = append(elem.packet, paddingZeros[:paddingSize]...) + // pad content to multiple of 16 + paddingSize := calculatePaddingSize(len(elem.packet), int(device.tun.mtu.Load())) + elem.packet = append(elem.packet, paddingZeros[:paddingSize]...) - // encrypt content and release to consumer + // encrypt content and release to consumer - binary.LittleEndian.PutUint64(nonce[4:], elem.nonce) - elem.packet = elem.keypair.send.Seal( - header, - nonce[:], - elem.packet, - nil, - ) - elem.Unlock() + binary.LittleEndian.PutUint64(nonce[4:], elem.nonce) + elem.packet = elem.keypair.send.Seal( + header, + nonce[:], + elem.packet, + nil, + ) + } + elemsContainer.Unlock() } } -/* Sequentially reads packets from queue and sends to endpoint - * - * Obs. Single instance per peer. - * The routine terminates then the outbound queue is closed. - */ -func (peer *Peer) RoutineSequentialSender() { +func (peer *Peer) RoutineSequentialSender(maxBatchSize int) { device := peer.device defer func() { defer device.log.Verbosef("%v - Routine: sequential sender - stopped", peer) @@ -415,36 +487,57 @@ func (peer *Peer) RoutineSequentialSender() { }() device.log.Verbosef("%v - Routine: sequential sender - started", peer) - for elem := range peer.queue.outbound.c { - if elem == nil { + bufs := make([][]byte, 0, maxBatchSize) + + for elemsContainer := range peer.queue.outbound.c { + bufs = bufs[:0] + if elemsContainer == nil { return } - elem.Lock() - if !peer.isRunning.Get() { + if !peer.isRunning.Load() { // peer has been stopped; return re-usable elems to the shared pool. // This is an optimization only. It is possible for the peer to be stopped // immediately after this check, in which case, elem will get processed. - // The timers and SendBuffer code are resilient to a few stragglers. + // The timers and SendBuffers code are resilient to a few stragglers. // TODO: rework peer shutdown order to ensure // that we never accidentally keep timers alive longer than necessary. - device.PutMessageBuffer(elem.buffer) - device.PutOutboundElement(elem) + elemsContainer.Lock() + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutOutboundElement(elem) + } continue } + dataSent := false + elemsContainer.Lock() + for _, elem := range elemsContainer.elems { + if len(elem.packet) != MessageKeepaliveSize { + dataSent = true + } + bufs = append(bufs, elem.packet) + } peer.timersAnyAuthenticatedPacketTraversal() peer.timersAnyAuthenticatedPacketSent() - // send message and return buffer to pool - - err := peer.SendBuffer(elem.packet) - if len(elem.packet) != MessageKeepaliveSize { + err := peer.SendBuffers(bufs) + if dataSent { peer.timersDataSent() } - device.PutMessageBuffer(elem.buffer) - device.PutOutboundElement(elem) + for _, elem := range elemsContainer.elems { + device.PutMessageBuffer(elem.buffer) + device.PutOutboundElement(elem) + } + device.PutOutboundElementsContainer(elemsContainer) + if err != nil { + var errGSO conn.ErrUDPGSODisabled + if errors.As(err, &errGSO) { + device.log.Verbosef(err.Error()) + err = errGSO.RetryErr + } + } if err != nil { - device.log.Errorf("%v - Failed to send data packet: %v", peer, err) + device.log.Errorf("%v - Failed to send data packets: %v", peer, err) continue } diff --git a/device/sticky_linux.go b/device/sticky_linux.go index 6193ea3..6057ff1 100644 --- a/device/sticky_linux.go +++ b/device/sticky_linux.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. * * This implements userspace semantics of "sticky sockets", modeled after * WireGuard's kernelspace implementation. This is more or less a straight port @@ -25,7 +25,10 @@ import ( ) func (device *Device) startRouteListener(bind conn.Bind) (*rwcancel.RWCancel, error) { - if _, ok := bind.(*conn.LinuxSocketBind); !ok { + if !conn.StdNetSupportsStickySockets { + return nil, nil + } + if _, ok := bind.(*conn.StdNetBind); !ok { return nil, nil } @@ -107,17 +110,17 @@ func (device *Device) routineRouteListener(bind conn.Bind, netlinkSock int, netl if !ok { break } - pePtr.peer.Lock() - if &pePtr.peer.endpoint != pePtr.endpoint { - pePtr.peer.Unlock() + pePtr.peer.endpoint.Lock() + if &pePtr.peer.endpoint.val != pePtr.endpoint { + pePtr.peer.endpoint.Unlock() break } - if uint32(pePtr.peer.endpoint.(*conn.LinuxSocketEndpoint).Src4().Ifindex) == ifidx { - pePtr.peer.Unlock() + if uint32(pePtr.peer.endpoint.val.(*conn.StdNetEndpoint).SrcIfidx()) == ifidx { + pePtr.peer.endpoint.Unlock() break } - pePtr.peer.endpoint.(*conn.LinuxSocketEndpoint).ClearSrc() - pePtr.peer.Unlock() + pePtr.peer.endpoint.clearSrcOnTx = true + pePtr.peer.endpoint.Unlock() } attr = attr[attrhdr.Len:] } @@ -131,18 +134,18 @@ func (device *Device) routineRouteListener(bind conn.Bind, netlinkSock int, netl device.peers.RLock() i := uint32(1) for _, peer := range device.peers.keyMap { - peer.RLock() - if peer.endpoint == nil { - peer.RUnlock() + peer.endpoint.Lock() + if peer.endpoint.val == nil { + peer.endpoint.Unlock() continue } - nativeEP, _ := peer.endpoint.(*conn.LinuxSocketEndpoint) + nativeEP, _ := peer.endpoint.val.(*conn.StdNetEndpoint) if nativeEP == nil { - peer.RUnlock() + peer.endpoint.Unlock() continue } - if nativeEP.IsV6() || nativeEP.Src4().Ifindex == 0 { - peer.RUnlock() + if nativeEP.DstIP().Is6() || nativeEP.SrcIfidx() == 0 { + peer.endpoint.Unlock() break } nlmsg := struct { @@ -169,12 +172,12 @@ func (device *Device) routineRouteListener(bind conn.Bind, netlinkSock int, netl Len: 8, Type: unix.RTA_DST, }, - nativeEP.Dst4().Addr, + nativeEP.DstIP().As4(), unix.RtAttr{ Len: 8, Type: unix.RTA_SRC, }, - nativeEP.Src4().Src, + nativeEP.SrcIP().As4(), unix.RtAttr{ Len: 8, Type: unix.RTA_MARK, @@ -185,10 +188,10 @@ func (device *Device) routineRouteListener(bind conn.Bind, netlinkSock int, netl reqPeerLock.Lock() reqPeer[i] = peerEndpointPtr{ peer: peer, - endpoint: &peer.endpoint, + endpoint: &peer.endpoint.val, } reqPeerLock.Unlock() - peer.RUnlock() + peer.endpoint.Unlock() i++ _, err := netlinkCancel.Write((*[unsafe.Sizeof(nlmsg)]byte)(unsafe.Pointer(&nlmsg))[:]) if err != nil { @@ -204,7 +207,7 @@ func (device *Device) routineRouteListener(bind conn.Bind, netlinkSock int, netl } func createNetlinkRouteSocket() (int, error) { - sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW, unix.NETLINK_ROUTE) + sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW|unix.SOCK_CLOEXEC, unix.NETLINK_ROUTE) if err != nil { return -1, err } diff --git a/device/timers.go b/device/timers.go index 176976d..d4a4ed4 100644 --- a/device/timers.go +++ b/device/timers.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. * * This is based heavily on timers.c from the kernel implementation. */ @@ -9,7 +9,6 @@ package device import ( "sync" - "sync/atomic" "time" _ "unsafe" ) @@ -74,11 +73,11 @@ func (timer *Timer) IsPending() bool { } func (peer *Peer) timersActive() bool { - return peer.isRunning.Get() && peer.device != nil && peer.device.isUp() + return peer.isRunning.Load() && peer.device != nil && peer.device.isUp() } func expiredRetransmitHandshake(peer *Peer) { - if atomic.LoadUint32(&peer.timers.handshakeAttempts) > MaxTimerHandshakes { + if peer.timers.handshakeAttempts.Load() > MaxTimerHandshakes { peer.device.log.Verbosef("%s - Handshake did not complete after %d attempts, giving up", peer, MaxTimerHandshakes+2) if peer.timersActive() { @@ -97,15 +96,11 @@ func expiredRetransmitHandshake(peer *Peer) { peer.timers.zeroKeyMaterial.Mod(RejectAfterTime * 3) } } else { - atomic.AddUint32(&peer.timers.handshakeAttempts, 1) - peer.device.log.Verbosef("%s - Handshake did not complete after %d seconds, retrying (try %d)", peer, int(RekeyTimeout.Seconds()), atomic.LoadUint32(&peer.timers.handshakeAttempts)+1) + peer.timers.handshakeAttempts.Add(1) + peer.device.log.Verbosef("%s - Handshake did not complete after %d seconds, retrying (try %d)", peer, int(RekeyTimeout.Seconds()), peer.timers.handshakeAttempts.Load()+1) /* We clear the endpoint address src address, in case this is the cause of trouble. */ - peer.Lock() - if peer.endpoint != nil { - peer.endpoint.ClearSrc() - } - peer.Unlock() + peer.markEndpointSrcForClearing() peer.SendHandshakeInitiation(true) } @@ -113,8 +108,8 @@ func expiredRetransmitHandshake(peer *Peer) { func expiredSendKeepalive(peer *Peer) { peer.SendKeepalive() - if peer.timers.needAnotherKeepalive.Get() { - peer.timers.needAnotherKeepalive.Set(false) + if peer.timers.needAnotherKeepalive.Load() { + peer.timers.needAnotherKeepalive.Store(false) if peer.timersActive() { peer.timers.sendKeepalive.Mod(KeepaliveTimeout) } @@ -124,13 +119,8 @@ func expiredSendKeepalive(peer *Peer) { func expiredNewHandshake(peer *Peer) { peer.device.log.Verbosef("%s - Retrying handshake because we stopped hearing back after %d seconds", peer, int((KeepaliveTimeout + RekeyTimeout).Seconds())) /* We clear the endpoint address src address, in case this is the cause of trouble. */ - peer.Lock() - if peer.endpoint != nil { - peer.endpoint.ClearSrc() - } - peer.Unlock() + peer.markEndpointSrcForClearing() peer.SendHandshakeInitiation(false) - } func expiredZeroKeyMaterial(peer *Peer) { @@ -139,7 +129,7 @@ func expiredZeroKeyMaterial(peer *Peer) { } func expiredPersistentKeepalive(peer *Peer) { - if atomic.LoadUint32(&peer.persistentKeepaliveInterval) > 0 { + if peer.persistentKeepaliveInterval.Load() > 0 { peer.SendKeepalive() } } @@ -157,7 +147,7 @@ func (peer *Peer) timersDataReceived() { if !peer.timers.sendKeepalive.IsPending() { peer.timers.sendKeepalive.Mod(KeepaliveTimeout) } else { - peer.timers.needAnotherKeepalive.Set(true) + peer.timers.needAnotherKeepalive.Store(true) } } } @@ -188,9 +178,9 @@ func (peer *Peer) timersHandshakeComplete() { if peer.timersActive() { peer.timers.retransmitHandshake.Del() } - atomic.StoreUint32(&peer.timers.handshakeAttempts, 0) - peer.timers.sentLastMinuteHandshake.Set(false) - atomic.StoreInt64(&peer.stats.lastHandshakeNano, time.Now().UnixNano()) + peer.timers.handshakeAttempts.Store(0) + peer.timers.sentLastMinuteHandshake.Store(false) + peer.lastHandshakeNano.Store(time.Now().UnixNano()) } /* Should be called after an ephemeral key is created, which is before sending a handshake response or after receiving a handshake response. */ @@ -202,7 +192,7 @@ func (peer *Peer) timersSessionDerived() { /* Should be called before a packet with authentication -- keepalive, data, or handshake -- is sent, or after one is received. */ func (peer *Peer) timersAnyAuthenticatedPacketTraversal() { - keepalive := atomic.LoadUint32(&peer.persistentKeepaliveInterval) + keepalive := peer.persistentKeepaliveInterval.Load() if keepalive > 0 && peer.timersActive() { peer.timers.persistentKeepalive.Mod(time.Duration(keepalive) * time.Second) } @@ -217,9 +207,9 @@ func (peer *Peer) timersInit() { } func (peer *Peer) timersStart() { - atomic.StoreUint32(&peer.timers.handshakeAttempts, 0) - peer.timers.sentLastMinuteHandshake.Set(false) - peer.timers.needAnotherKeepalive.Set(false) + peer.timers.handshakeAttempts.Store(0) + peer.timers.sentLastMinuteHandshake.Store(false) + peer.timers.needAnotherKeepalive.Store(false) } func (peer *Peer) timersStop() { diff --git a/device/tun.go b/device/tun.go index 4af9548..2a2ace9 100644 --- a/device/tun.go +++ b/device/tun.go @@ -1,13 +1,12 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device import ( "fmt" - "sync/atomic" "golang.zx2c4.com/wireguard/tun" ) @@ -33,7 +32,7 @@ func (device *Device) RoutineTUNEventReader() { tooLarge = fmt.Sprintf(" (too large, capped at %v)", MaxContentSize) mtu = MaxContentSize } - old := atomic.SwapInt32(&device.tun.mtu, int32(mtu)) + old := device.tun.mtu.Swap(int32(mtu)) if int(old) != mtu { device.log.Verbosef("MTU updated: %v%s", mtu, tooLarge) } diff --git a/device/uapi.go b/device/uapi.go index 98e8311..d81dae3 100644 --- a/device/uapi.go +++ b/device/uapi.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package device @@ -12,13 +12,12 @@ import ( "fmt" "io" "net" + "net/netip" "strconv" "strings" "sync" - "sync/atomic" "time" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/ipc" ) @@ -39,12 +38,12 @@ func (s IPCError) ErrorCode() int64 { return s.code } -func ipcErrorf(code int64, msg string, args ...interface{}) *IPCError { +func ipcErrorf(code int64, msg string, args ...any) *IPCError { return &IPCError{code: code, err: fmt.Errorf(msg, args...)} } var byteBufferPool = &sync.Pool{ - New: func() interface{} { return new(bytes.Buffer) }, + New: func() any { return new(bytes.Buffer) }, } // IpcGetOperation implements the WireGuard configuration protocol "get" operation. @@ -56,7 +55,7 @@ func (device *Device) IpcGetOperation(w io.Writer) error { buf := byteBufferPool.Get().(*bytes.Buffer) buf.Reset() defer byteBufferPool.Put(buf) - sendf := func(format string, args ...interface{}) { + sendf := func(format string, args ...any) { fmt.Fprintf(buf, format, args...) buf.WriteByte('\n') } @@ -73,7 +72,6 @@ func (device *Device) IpcGetOperation(w io.Writer) error { } func() { - // lock required resources device.net.RLock() @@ -99,28 +97,28 @@ func (device *Device) IpcGetOperation(w io.Writer) error { sendf("fwmark=%d", device.net.fwmark) } - // serialize each peer state - for _, peer := range device.peers.keyMap { - peer.RLock() - defer peer.RUnlock() - + // Serialize peer state. + peer.handshake.mutex.RLock() keyf("public_key", (*[32]byte)(&peer.handshake.remoteStatic)) keyf("preshared_key", (*[32]byte)(&peer.handshake.presharedKey)) + peer.handshake.mutex.RUnlock() sendf("protocol_version=1") - if peer.endpoint != nil { - sendf("endpoint=%s", peer.endpoint.DstToString()) + peer.endpoint.Lock() + if peer.endpoint.val != nil { + sendf("endpoint=%s", peer.endpoint.val.DstToString()) } + peer.endpoint.Unlock() - nano := atomic.LoadInt64(&peer.stats.lastHandshakeNano) + nano := peer.lastHandshakeNano.Load() secs := nano / time.Second.Nanoseconds() nano %= time.Second.Nanoseconds() sendf("last_handshake_time_sec=%d", secs) sendf("last_handshake_time_nsec=%d", nano) - sendf("tx_bytes=%d", atomic.LoadUint64(&peer.stats.txBytes)) - sendf("rx_bytes=%d", atomic.LoadUint64(&peer.stats.rxBytes)) - sendf("persistent_keepalive_interval=%d", atomic.LoadUint32(&peer.persistentKeepaliveInterval)) + sendf("tx_bytes=%d", peer.txBytes.Load()) + sendf("rx_bytes=%d", peer.rxBytes.Load()) + sendf("persistent_keepalive_interval=%d", peer.persistentKeepaliveInterval.Load()) device.allowedips.EntriesForPeer(peer, func(prefix netip.Prefix) bool { sendf("allowed_ip=%s", prefix.String()) @@ -157,14 +155,13 @@ func (device *Device) IpcSetOperation(r io.Reader) (err error) { line := scanner.Text() if line == "" { // Blank line means terminate operation. + peer.handlePostConfig() return nil } - parts := strings.Split(line, "=") - if len(parts) != 2 { - return ipcErrorf(ipc.IpcErrorProtocol, "failed to parse line %q, found %d =-separated parts, want 2", line, len(parts)) + key, value, ok := strings.Cut(line, "=") + if !ok { + return ipcErrorf(ipc.IpcErrorProtocol, "failed to parse line %q", line) } - key := parts[0] - value := parts[1] if key == "public_key" { if deviceConfig { @@ -263,7 +260,7 @@ func (peer *ipcSetPeer) handlePostConfig() { return } if peer.created { - peer.disableRoaming = peer.device.net.brokenRoaming && peer.endpoint != nil + peer.endpoint.disableRoaming = peer.device.net.brokenRoaming && peer.endpoint.val != nil } if peer.device.isUp() { peer.Start() @@ -346,9 +343,9 @@ func (device *Device) handlePeerLine(peer *ipcSetPeer, key, value string) error if err != nil { return ipcErrorf(ipc.IpcErrorInvalid, "failed to set endpoint %v: %w", value, err) } - peer.Lock() - defer peer.Unlock() - peer.endpoint = endpoint + peer.endpoint.Lock() + defer peer.endpoint.Unlock() + peer.endpoint.val = endpoint case "persistent_keepalive_interval": device.log.Verbosef("%v - UAPI: Updating persistent keepalive interval", peer.Peer) @@ -358,7 +355,7 @@ func (device *Device) handlePeerLine(peer *ipcSetPeer, key, value string) error return ipcErrorf(ipc.IpcErrorInvalid, "failed to set persistent keepalive interval: %w", err) } - old := atomic.SwapUint32(&peer.persistentKeepaliveInterval, uint32(secs)) + old := peer.persistentKeepaliveInterval.Swap(uint32(secs)) // Send immediate keepalive if we're turning it on and before it wasn't on. peer.pkaOn = old == 0 && secs != 0 diff --git a/format_test.go b/format_test.go index 198cd49..6f6cab7 100644 --- a/format_test.go +++ b/format_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package main @@ -1,11 +1,16 @@ module golang.zx2c4.com/wireguard -go 1.17 +go 1.20 require ( - golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa - golang.org/x/net v0.0.0-20211111083644-e5c967477495 - golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 - golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d - golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 + golang.org/x/crypto v0.13.0 + golang.org/x/net v0.15.0 + golang.org/x/sys v0.12.0 + golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 + gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259 +) + +require ( + github.com/google/btree v1.0.1 // indirect + golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect ) @@ -1,19 +1,14 @@ -golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa h1:idItI2DDfCokpg0N51B2VtiLdJ4vAuXC9fnCb2gACo4= -golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc= -golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg= -golang.org/x/net v0.0.0-20211111083644-e5c967477495 h1:cjxxlQm6d4kYbhpZ2ghvmI8xnq0AG+jXmzrhzfkyu5A= -golang.org/x/net v0.0.0-20211111083644-e5c967477495/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y= -golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= -golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 h1:WecRHqgE09JBkh/584XIE6PMz5KKE/vER4izNUi30AQ= -golang.org/x/sys v0.0.0-20211110154304-99a53858aa08/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= -golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= -golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= -golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= -golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= -golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d h1:9+v0G0naRhLPOJEeJOL6NuXTtAHHwmkyZlgQJ0XcQ8I= -golang.zx2c4.com/go118/netip v0.0.0-20211111135330-a4a02eeacf9d/go.mod h1:5yyfuiqVIJ7t+3MqrpTQ+QqRkMWiESiyDvPNvKYCecg= -golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 h1:Ug9qvr1myri/zFN6xL17LSCBGFDnphBBhzmILHsM5TY= -golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI= +github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4= +github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA= +golang.org/x/crypto v0.13.0 h1:mvySKfSWJ+UKUii46M40LOvyWfN0s2U+46/jDd0e6Ck= +golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc= +golang.org/x/net v0.15.0 h1:ugBLEUaxABaB5AJqW9enI0ACdci2RUd4eP51NTBvuJ8= +golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk= +golang.org/x/sys v0.12.0 h1:CM0HF96J0hcLAwsHPJZjfdNzs0gftsLfgKt57wWHJ0o= +golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 h1:vVKdlvoWBphwdxWKrFZEuM0kGgGLxUOYcY4U/2Vjg44= +golang.org/x/time v0.0.0-20220210224613-90d013bbcef8/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= +golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 h1:B82qJJgjvYKsXS9jeunTOisW56dUokqW/FOteYJJ/yg= +golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI= +gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259 h1:TbRPT0HtzFP3Cno1zZo7yPzEEnfu8EjLfl6IU9VfqkQ= +gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259/go.mod h1:AVgIgHMwK63XvmAzWG9vLQ41YnVHN0du0tEC46fI7yY= diff --git a/ipc/namedpipe/file.go b/ipc/namedpipe/file.go index 9c2481d..ab1e13d 100644 --- a/ipc/namedpipe/file.go +++ b/ipc/namedpipe/file.go @@ -4,7 +4,6 @@ // license that can be found in the LICENSE file. //go:build windows -// +build windows package namedpipe @@ -22,8 +21,10 @@ import ( type timeoutChan chan struct{} -var ioInitOnce sync.Once -var ioCompletionPort windows.Handle +var ( + ioInitOnce sync.Once + ioCompletionPort windows.Handle +) // ioResult contains the result of an asynchronous IO operation type ioResult struct { @@ -52,7 +53,7 @@ type file struct { handle windows.Handle wg sync.WaitGroup wgLock sync.RWMutex - closing uint32 // used as atomic boolean + closing atomic.Bool socket bool readDeadline deadlineHandler writeDeadline deadlineHandler @@ -63,7 +64,7 @@ type deadlineHandler struct { channel timeoutChan channelLock sync.RWMutex timer *time.Timer - timedout uint32 // used as atomic boolean + timedout atomic.Bool } // makeFile makes a new file from an existing file handle @@ -87,7 +88,7 @@ func makeFile(h windows.Handle) (*file, error) { func (f *file) closeHandle() { f.wgLock.Lock() // Atomically set that we are closing, releasing the resources only once. - if atomic.SwapUint32(&f.closing, 1) == 0 { + if f.closing.Swap(true) == false { f.wgLock.Unlock() // cancel all IO and wait for it to complete windows.CancelIoEx(f.handle, nil) @@ -110,7 +111,7 @@ func (f *file) Close() error { // The caller must call f.wg.Done() when the IO is finished, prior to Close() returning. func (f *file) prepareIo() (*ioOperation, error) { f.wgLock.RLock() - if atomic.LoadUint32(&f.closing) == 1 { + if f.closing.Load() { f.wgLock.RUnlock() return nil, os.ErrClosed } @@ -142,7 +143,7 @@ func (f *file) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err err return int(bytes), err } - if atomic.LoadUint32(&f.closing) == 1 { + if f.closing.Load() { windows.CancelIoEx(f.handle, &c.o) } @@ -158,7 +159,7 @@ func (f *file) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err err case r = <-c.ch: err = r.err if err == windows.ERROR_OPERATION_ABORTED { - if atomic.LoadUint32(&f.closing) == 1 { + if f.closing.Load() { err = os.ErrClosed } } else if err != nil && f.socket { @@ -190,7 +191,7 @@ func (f *file) Read(b []byte) (int, error) { } defer f.wg.Done() - if atomic.LoadUint32(&f.readDeadline.timedout) == 1 { + if f.readDeadline.timedout.Load() { return 0, os.ErrDeadlineExceeded } @@ -217,7 +218,7 @@ func (f *file) Write(b []byte) (int, error) { } defer f.wg.Done() - if atomic.LoadUint32(&f.writeDeadline.timedout) == 1 { + if f.writeDeadline.timedout.Load() { return 0, os.ErrDeadlineExceeded } @@ -254,7 +255,7 @@ func (d *deadlineHandler) set(deadline time.Time) error { } d.timer = nil } - atomic.StoreUint32(&d.timedout, 0) + d.timedout.Store(false) select { case <-d.channel: @@ -269,7 +270,7 @@ func (d *deadlineHandler) set(deadline time.Time) error { } timeoutIO := func() { - atomic.StoreUint32(&d.timedout, 1) + d.timedout.Store(true) close(d.channel) } diff --git a/ipc/namedpipe/namedpipe.go b/ipc/namedpipe/namedpipe.go index 6db5ea3..ef3dea1 100644 --- a/ipc/namedpipe/namedpipe.go +++ b/ipc/namedpipe/namedpipe.go @@ -4,7 +4,6 @@ // license that can be found in the LICENSE file. //go:build windows -// +build windows // Package namedpipe implements a net.Conn and net.Listener around Windows named pipes. package namedpipe @@ -29,7 +28,7 @@ type pipe struct { type messageBytePipe struct { pipe - writeClosed int32 + writeClosed atomic.Bool readEOF bool } @@ -51,17 +50,17 @@ func (f *pipe) SetDeadline(t time.Time) error { // CloseWrite closes the write side of a message pipe in byte mode. func (f *messageBytePipe) CloseWrite() error { - if !atomic.CompareAndSwapInt32(&f.writeClosed, 0, 1) { + if !f.writeClosed.CompareAndSwap(false, true) { return io.ErrClosedPipe } err := f.file.Flush() if err != nil { - atomic.StoreInt32(&f.writeClosed, 0) + f.writeClosed.Store(false) return err } _, err = f.file.Write(nil) if err != nil { - atomic.StoreInt32(&f.writeClosed, 0) + f.writeClosed.Store(false) return err } return nil @@ -70,7 +69,7 @@ func (f *messageBytePipe) CloseWrite() error { // Write writes bytes to a message pipe in byte mode. Zero-byte writes are ignored, since // they are used to implement CloseWrite. func (f *messageBytePipe) Write(b []byte) (int, error) { - if atomic.LoadInt32(&f.writeClosed) != 0 { + if f.writeClosed.Load() { return 0, io.ErrClosedPipe } if len(b) == 0 { diff --git a/ipc/namedpipe/namedpipe_test.go b/ipc/namedpipe/namedpipe_test.go index 0573d0f..998453b 100644 --- a/ipc/namedpipe/namedpipe_test.go +++ b/ipc/namedpipe/namedpipe_test.go @@ -4,7 +4,6 @@ // license that can be found in the LICENSE file. //go:build windows -// +build windows package namedpipe_test @@ -169,7 +168,7 @@ func TestDialAccessDeniedWithRestrictedSD(t *testing.T) { } } -func getConnection(cfg *namedpipe.ListenConfig) (client net.Conn, server net.Conn, err error) { +func getConnection(cfg *namedpipe.ListenConfig) (client, server net.Conn, err error) { pipePath := randomPipePath() if cfg == nil { cfg = &namedpipe.ListenConfig{} diff --git a/ipc/uapi_bsd.go b/ipc/uapi_bsd.go index 6deaa87..ddcaf27 100644 --- a/ipc/uapi_bsd.go +++ b/ipc/uapi_bsd.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ipc @@ -54,7 +54,6 @@ func (l *UAPIListener) Addr() net.Addr { } func UAPIListen(name string, file *os.File) (net.Listener, error) { - // wrap file in listener listener, err := net.FileListener(file) @@ -104,7 +103,7 @@ func UAPIListen(name string, file *os.File) (net.Listener, error) { l.connErr <- err return } - if kerr != nil || n != 1 { + if (kerr != nil || n != 1) && kerr != unix.EINTR { if kerr != nil { l.connErr <- kerr } else { diff --git a/ipc/uapi_linux.go b/ipc/uapi_linux.go index e03a00b..1562a18 100644 --- a/ipc/uapi_linux.go +++ b/ipc/uapi_linux.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ipc @@ -51,7 +51,6 @@ func (l *UAPIListener) Addr() net.Addr { } func UAPIListen(name string, file *os.File) (net.Listener, error) { - // wrap file in listener listener, err := net.FileListener(file) @@ -97,7 +96,7 @@ func UAPIListen(name string, file *os.File) (net.Listener, error) { } go func(l *UAPIListener) { - var buff [0]byte + var buf [0]byte for { defer uapi.inotifyRWCancel.Close() // start with lstat to avoid race condition @@ -105,7 +104,7 @@ func UAPIListen(name string, file *os.File) (net.Listener, error) { l.connErr <- err return } - _, err := uapi.inotifyRWCancel.Read(buff[:]) + _, err := uapi.inotifyRWCancel.Read(buf[:]) if err != nil { l.connErr <- err return diff --git a/ipc/uapi_unix.go b/ipc/uapi_unix.go index 57caf21..e67be26 100644 --- a/ipc/uapi_unix.go +++ b/ipc/uapi_unix.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ipc @@ -33,7 +33,7 @@ func sockPath(iface string) string { } func UAPIOpen(name string) (*os.File, error) { - if err := os.MkdirAll(socketDirectory, 0755); err != nil { + if err := os.MkdirAll(socketDirectory, 0o755); err != nil { return nil, err } @@ -43,7 +43,7 @@ func UAPIOpen(name string) (*os.File, error) { return nil, err } - oldUmask := unix.Umask(0077) + oldUmask := unix.Umask(0o077) defer unix.Umask(oldUmask) listener, err := net.ListenUnix("unix", addr) diff --git a/ipc/uapi_js.go b/ipc/uapi_wasm.go index be36b5d..fa84684 100644 --- a/ipc/uapi_js.go +++ b/ipc/uapi_wasm.go @@ -1,11 +1,11 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ipc -// Made up sentinel error codes for the js/wasm platform. +// Made up sentinel error codes for {js,wasip1}/wasm. const ( IpcErrorIO = 1 IpcErrorInvalid = 2 diff --git a/ipc/uapi_windows.go b/ipc/uapi_windows.go index a1bfbd1..aa023c9 100644 --- a/ipc/uapi_windows.go +++ b/ipc/uapi_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ipc @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package main @@ -13,8 +13,8 @@ import ( "os/signal" "runtime" "strconv" - "syscall" + "golang.org/x/sys/unix" "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/device" "golang.zx2c4.com/wireguard/ipc" @@ -111,7 +111,7 @@ func main() { // open TUN device (or use supplied fd) - tun, err := func() (tun.Device, error) { + tdev, err := func() (tun.Device, error) { tunFdStr := os.Getenv(ENV_WG_TUN_FD) if tunFdStr == "" { return tun.CreateTUN(interfaceName, device.DefaultMTU) @@ -124,7 +124,7 @@ func main() { return nil, err } - err = syscall.SetNonblock(int(fd), true) + err = unix.SetNonblock(int(fd), true) if err != nil { return nil, err } @@ -134,7 +134,7 @@ func main() { }() if err == nil { - realInterfaceName, err2 := tun.Name() + realInterfaceName, err2 := tdev.Name() if err2 == nil { interfaceName = realInterfaceName } @@ -169,7 +169,6 @@ func main() { return os.NewFile(uintptr(fd), ""), nil }() - if err != nil { logger.Errorf("UAPI listen error: %v", err) os.Exit(ExitSetupFailed) @@ -197,7 +196,7 @@ func main() { files[0], // stdin files[1], // stdout files[2], // stderr - tun.File(), + tdev.File(), fileUAPI, }, Dir: ".", @@ -223,7 +222,7 @@ func main() { return } - device := device.NewDevice(tun, conn.NewDefaultBind(), logger) + device := device.NewDevice(tdev, conn.NewDefaultBind(), logger) logger.Verbosef("Device started") @@ -251,7 +250,7 @@ func main() { // wait for program to terminate - signal.Notify(term, syscall.SIGTERM) + signal.Notify(term, unix.SIGTERM) signal.Notify(term, os.Interrupt) select { diff --git a/main_windows.go b/main_windows.go index 5a7b136..a4dc46f 100644 --- a/main_windows.go +++ b/main_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package main @@ -9,7 +9,8 @@ import ( "fmt" "os" "os/signal" - "syscall" + + "golang.org/x/sys/windows" "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/device" @@ -81,7 +82,7 @@ func main() { signal.Notify(term, os.Interrupt) signal.Notify(term, os.Kill) - signal.Notify(term, syscall.SIGTERM) + signal.Notify(term, windows.SIGTERM) select { case <-term: diff --git a/ratelimiter/ratelimiter.go b/ratelimiter/ratelimiter.go index 8e78d5e..f7d05ef 100644 --- a/ratelimiter/ratelimiter.go +++ b/ratelimiter/ratelimiter.go @@ -1,15 +1,14 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ratelimiter import ( + "net/netip" "sync" "time" - - "golang.zx2c4.com/go118/netip" ) const ( diff --git a/ratelimiter/ratelimiter_test.go b/ratelimiter/ratelimiter_test.go index 3e06ff7..0bfa3af 100644 --- a/ratelimiter/ratelimiter_test.go +++ b/ratelimiter/ratelimiter_test.go @@ -1,15 +1,14 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package ratelimiter import ( + "net/netip" "testing" "time" - - "golang.zx2c4.com/go118/netip" ) type result struct { diff --git a/replay/replay.go b/replay/replay.go index fac7ab2..8b99e23 100644 --- a/replay/replay.go +++ b/replay/replay.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ // Package replay implements an efficient anti-replay algorithm as specified in RFC 6479. @@ -34,7 +34,7 @@ func (f *Filter) Reset() { // ValidateCounter checks if the counter should be accepted. // Overlimit counters (>= limit) are always rejected. -func (f *Filter) ValidateCounter(counter uint64, limit uint64) bool { +func (f *Filter) ValidateCounter(counter, limit uint64) bool { if counter >= limit { return false } diff --git a/replay/replay_test.go b/replay/replay_test.go index 28c3a0e..9a9e4a8 100644 --- a/replay/replay_test.go +++ b/replay/replay_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package replay diff --git a/rwcancel/rwcancel.go b/rwcancel/rwcancel.go index c3b2299..e397c0e 100644 --- a/rwcancel/rwcancel.go +++ b/rwcancel/rwcancel.go @@ -1,8 +1,8 @@ -//go:build !windows && !js +//go:build !windows && !wasm /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ // Package rwcancel implements cancelable read/write operations on diff --git a/rwcancel/rwcancel_stub.go b/rwcancel/rwcancel_stub.go index fae47b4..2a98b2b 100644 --- a/rwcancel/rwcancel_stub.go +++ b/rwcancel/rwcancel_stub.go @@ -1,10 +1,9 @@ -//go:build windows || js +//go:build windows || wasm // SPDX-License-Identifier: MIT package rwcancel -type RWCancel struct { -} +type RWCancel struct{} func (*RWCancel) Cancel() {} diff --git a/tai64n/tai64n.go b/tai64n/tai64n.go index e1fa26a..8f10b39 100644 --- a/tai64n/tai64n.go +++ b/tai64n/tai64n.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tai64n @@ -11,9 +11,11 @@ import ( "time" ) -const TimestampSize = 12 -const base = uint64(0x400000000000000a) -const whitenerMask = uint32(0x1000000 - 1) +const ( + TimestampSize = 12 + base = uint64(0x400000000000000a) + whitenerMask = uint32(0x1000000 - 1) +) type Timestamp [TimestampSize]byte diff --git a/tai64n/tai64n_test.go b/tai64n/tai64n_test.go index 97eb26f..c70fc1a 100644 --- a/tai64n/tai64n_test.go +++ b/tai64n/tai64n_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tai64n diff --git a/tun/alignment_windows_test.go b/tun/alignment_windows_test.go index b765cca..67a785e 100644 --- a/tun/alignment_windows_test.go +++ b/tun/alignment_windows_test.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun diff --git a/tun/checksum.go b/tun/checksum.go new file mode 100644 index 0000000..29a8fc8 --- /dev/null +++ b/tun/checksum.go @@ -0,0 +1,118 @@ +package tun + +import "encoding/binary" + +// TODO: Explore SIMD and/or other assembly optimizations. +// TODO: Test native endian loads. See RFC 1071 section 2 part B. +func checksumNoFold(b []byte, initial uint64) uint64 { + ac := initial + + for len(b) >= 128 { + ac += uint64(binary.BigEndian.Uint32(b[:4])) + ac += uint64(binary.BigEndian.Uint32(b[4:8])) + ac += uint64(binary.BigEndian.Uint32(b[8:12])) + ac += uint64(binary.BigEndian.Uint32(b[12:16])) + ac += uint64(binary.BigEndian.Uint32(b[16:20])) + ac += uint64(binary.BigEndian.Uint32(b[20:24])) + ac += uint64(binary.BigEndian.Uint32(b[24:28])) + ac += uint64(binary.BigEndian.Uint32(b[28:32])) + ac += uint64(binary.BigEndian.Uint32(b[32:36])) + ac += uint64(binary.BigEndian.Uint32(b[36:40])) + ac += uint64(binary.BigEndian.Uint32(b[40:44])) + ac += uint64(binary.BigEndian.Uint32(b[44:48])) + ac += uint64(binary.BigEndian.Uint32(b[48:52])) + ac += uint64(binary.BigEndian.Uint32(b[52:56])) + ac += uint64(binary.BigEndian.Uint32(b[56:60])) + ac += uint64(binary.BigEndian.Uint32(b[60:64])) + ac += uint64(binary.BigEndian.Uint32(b[64:68])) + ac += uint64(binary.BigEndian.Uint32(b[68:72])) + ac += uint64(binary.BigEndian.Uint32(b[72:76])) + ac += uint64(binary.BigEndian.Uint32(b[76:80])) + ac += uint64(binary.BigEndian.Uint32(b[80:84])) + ac += uint64(binary.BigEndian.Uint32(b[84:88])) + ac += uint64(binary.BigEndian.Uint32(b[88:92])) + ac += uint64(binary.BigEndian.Uint32(b[92:96])) + ac += uint64(binary.BigEndian.Uint32(b[96:100])) + ac += uint64(binary.BigEndian.Uint32(b[100:104])) + ac += uint64(binary.BigEndian.Uint32(b[104:108])) + ac += uint64(binary.BigEndian.Uint32(b[108:112])) + ac += uint64(binary.BigEndian.Uint32(b[112:116])) + ac += uint64(binary.BigEndian.Uint32(b[116:120])) + ac += uint64(binary.BigEndian.Uint32(b[120:124])) + ac += uint64(binary.BigEndian.Uint32(b[124:128])) + b = b[128:] + } + if len(b) >= 64 { + ac += uint64(binary.BigEndian.Uint32(b[:4])) + ac += uint64(binary.BigEndian.Uint32(b[4:8])) + ac += uint64(binary.BigEndian.Uint32(b[8:12])) + ac += uint64(binary.BigEndian.Uint32(b[12:16])) + ac += uint64(binary.BigEndian.Uint32(b[16:20])) + ac += uint64(binary.BigEndian.Uint32(b[20:24])) + ac += uint64(binary.BigEndian.Uint32(b[24:28])) + ac += uint64(binary.BigEndian.Uint32(b[28:32])) + ac += uint64(binary.BigEndian.Uint32(b[32:36])) + ac += uint64(binary.BigEndian.Uint32(b[36:40])) + ac += uint64(binary.BigEndian.Uint32(b[40:44])) + ac += uint64(binary.BigEndian.Uint32(b[44:48])) + ac += uint64(binary.BigEndian.Uint32(b[48:52])) + ac += uint64(binary.BigEndian.Uint32(b[52:56])) + ac += uint64(binary.BigEndian.Uint32(b[56:60])) + ac += uint64(binary.BigEndian.Uint32(b[60:64])) + b = b[64:] + } + if len(b) >= 32 { + ac += uint64(binary.BigEndian.Uint32(b[:4])) + ac += uint64(binary.BigEndian.Uint32(b[4:8])) + ac += uint64(binary.BigEndian.Uint32(b[8:12])) + ac += uint64(binary.BigEndian.Uint32(b[12:16])) + ac += uint64(binary.BigEndian.Uint32(b[16:20])) + ac += uint64(binary.BigEndian.Uint32(b[20:24])) + ac += uint64(binary.BigEndian.Uint32(b[24:28])) + ac += uint64(binary.BigEndian.Uint32(b[28:32])) + b = b[32:] + } + if len(b) >= 16 { + ac += uint64(binary.BigEndian.Uint32(b[:4])) + ac += uint64(binary.BigEndian.Uint32(b[4:8])) + ac += uint64(binary.BigEndian.Uint32(b[8:12])) + ac += uint64(binary.BigEndian.Uint32(b[12:16])) + b = b[16:] + } + if len(b) >= 8 { + ac += uint64(binary.BigEndian.Uint32(b[:4])) + ac += uint64(binary.BigEndian.Uint32(b[4:8])) + b = b[8:] + } + if len(b) >= 4 { + ac += uint64(binary.BigEndian.Uint32(b)) + b = b[4:] + } + if len(b) >= 2 { + ac += uint64(binary.BigEndian.Uint16(b)) + b = b[2:] + } + if len(b) == 1 { + ac += uint64(b[0]) << 8 + } + + return ac +} + +func checksum(b []byte, initial uint64) uint16 { + ac := checksumNoFold(b, initial) + ac = (ac >> 16) + (ac & 0xffff) + ac = (ac >> 16) + (ac & 0xffff) + ac = (ac >> 16) + (ac & 0xffff) + ac = (ac >> 16) + (ac & 0xffff) + return uint16(ac) +} + +func pseudoHeaderChecksumNoFold(protocol uint8, srcAddr, dstAddr []byte, totalLen uint16) uint64 { + sum := checksumNoFold(srcAddr, 0) + sum = checksumNoFold(dstAddr, sum) + sum = checksumNoFold([]byte{0, protocol}, sum) + tmp := make([]byte, 2) + binary.BigEndian.PutUint16(tmp, totalLen) + return checksumNoFold(tmp, sum) +} diff --git a/tun/checksum_test.go b/tun/checksum_test.go new file mode 100644 index 0000000..c1ccff5 --- /dev/null +++ b/tun/checksum_test.go @@ -0,0 +1,35 @@ +package tun + +import ( + "fmt" + "math/rand" + "testing" +) + +func BenchmarkChecksum(b *testing.B) { + lengths := []int{ + 64, + 128, + 256, + 512, + 1024, + 1500, + 2048, + 4096, + 8192, + 9000, + 9001, + } + + for _, length := range lengths { + b.Run(fmt.Sprintf("%d", length), func(b *testing.B) { + buf := make([]byte, length) + rng := rand.New(rand.NewSource(1)) + rng.Read(buf) + b.ResetTimer() + for i := 0; i < b.N; i++ { + checksum(buf, 0) + } + }) + } +} diff --git a/tun/errors.go b/tun/errors.go new file mode 100644 index 0000000..75ae3a4 --- /dev/null +++ b/tun/errors.go @@ -0,0 +1,12 @@ +package tun + +import ( + "errors" +) + +var ( + // ErrTooManySegments is returned by Device.Read() when segmentation + // overflows the length of supplied buffers. This error should not cause + // reads to cease. + ErrTooManySegments = errors.New("too many segments") +) diff --git a/tun/netstack/examples/http_client.go b/tun/netstack/examples/http_client.go index b39b453..ccd32ed 100644 --- a/tun/netstack/examples/http_client.go +++ b/tun/netstack/examples/http_client.go @@ -1,9 +1,8 @@ //go:build ignore -// +build ignore /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package main @@ -12,8 +11,8 @@ import ( "io" "log" "net/http" + "net/netip" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/device" "golang.zx2c4.com/wireguard/tun/netstack" @@ -21,17 +20,17 @@ import ( func main() { tun, tnet, err := netstack.CreateNetTUN( - []netip.Addr{netip.MustParseAddr("192.168.4.29")}, + []netip.Addr{netip.MustParseAddr("192.168.4.28")}, []netip.Addr{netip.MustParseAddr("8.8.8.8")}, 1420) if err != nil { log.Panic(err) } dev := device.NewDevice(tun, conn.NewDefaultBind(), device.NewLogger(device.LogLevelVerbose, "")) - dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f -public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b -endpoint=163.172.161.0:12912 + err = dev.IpcSet(`private_key=087ec6e14bbed210e7215cdc73468dfa23f080a1bfb8665b2fd809bd99d28379 +public_key=c4c8e984c5322c8184c72265b92b250fdb63688705f504ba003c88f03393cf28 allowed_ip=0.0.0.0/0 +endpoint=127.0.0.1:58120 `) err = dev.Up() if err != nil { @@ -43,7 +42,7 @@ allowed_ip=0.0.0.0/0 DialContext: tnet.DialContext, }, } - resp, err := client.Get("https://www.zx2c4.com/ip") + resp, err := client.Get("http://192.168.4.29/") if err != nil { log.Panic(err) } diff --git a/tun/netstack/examples/http_server.go b/tun/netstack/examples/http_server.go index 40f7804..f5b7a8f 100644 --- a/tun/netstack/examples/http_server.go +++ b/tun/netstack/examples/http_server.go @@ -1,9 +1,8 @@ //go:build ignore -// +build ignore /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package main @@ -13,8 +12,8 @@ import ( "log" "net" "net/http" + "net/netip" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/device" "golang.zx2c4.com/wireguard/tun/netstack" @@ -30,10 +29,10 @@ func main() { log.Panic(err) } dev := device.NewDevice(tun, conn.NewDefaultBind(), device.NewLogger(device.LogLevelVerbose, "")) - dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f -public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b -endpoint=163.172.161.0:12912 -allowed_ip=0.0.0.0/0 + dev.IpcSet(`private_key=003ed5d73b55806c30de3f8a7bdab38af13539220533055e635690b8b87ad641 +listen_port=58120 +public_key=f928d4f6c1b86c12f2562c10b07c555c5c57fd00f59e90c8d8d88767271cbf7c +allowed_ip=192.168.4.28/32 persistent_keepalive_interval=25 `) dev.Up() diff --git a/tun/netstack/examples/ping_client.go b/tun/netstack/examples/ping_client.go new file mode 100644 index 0000000..2eef0fb --- /dev/null +++ b/tun/netstack/examples/ping_client.go @@ -0,0 +1,75 @@ +//go:build ignore + +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package main + +import ( + "bytes" + "log" + "math/rand" + "net/netip" + "time" + + "golang.org/x/net/icmp" + "golang.org/x/net/ipv4" + + "golang.zx2c4.com/wireguard/conn" + "golang.zx2c4.com/wireguard/device" + "golang.zx2c4.com/wireguard/tun/netstack" +) + +func main() { + tun, tnet, err := netstack.CreateNetTUN( + []netip.Addr{netip.MustParseAddr("192.168.4.29")}, + []netip.Addr{netip.MustParseAddr("8.8.8.8")}, + 1420) + if err != nil { + log.Panic(err) + } + dev := device.NewDevice(tun, conn.NewDefaultBind(), device.NewLogger(device.LogLevelVerbose, "")) + dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f +public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b +endpoint=163.172.161.0:12912 +allowed_ip=0.0.0.0/0 +`) + err = dev.Up() + if err != nil { + log.Panic(err) + } + + socket, err := tnet.Dial("ping4", "zx2c4.com") + if err != nil { + log.Panic(err) + } + requestPing := icmp.Echo{ + Seq: rand.Intn(1 << 16), + Data: []byte("gopher burrow"), + } + icmpBytes, _ := (&icmp.Message{Type: ipv4.ICMPTypeEcho, Code: 0, Body: &requestPing}).Marshal(nil) + socket.SetReadDeadline(time.Now().Add(time.Second * 10)) + start := time.Now() + _, err = socket.Write(icmpBytes) + if err != nil { + log.Panic(err) + } + n, err := socket.Read(icmpBytes[:]) + if err != nil { + log.Panic(err) + } + replyPacket, err := icmp.ParseMessage(1, icmpBytes[:n]) + if err != nil { + log.Panic(err) + } + replyPing, ok := replyPacket.Body.(*icmp.Echo) + if !ok { + log.Panicf("invalid reply type: %v", replyPacket) + } + if !bytes.Equal(replyPing.Data, requestPing.Data) || replyPing.Seq != requestPing.Seq { + log.Panicf("invalid ping reply: %v", replyPing) + } + log.Printf("Ping latency: %v", time.Since(start)) +} diff --git a/tun/netstack/go.mod b/tun/netstack/go.mod deleted file mode 100644 index 46b57ba..0000000 --- a/tun/netstack/go.mod +++ /dev/null @@ -1,12 +0,0 @@ -module golang.zx2c4.com/wireguard/tun/netstack - -go 1.16 - -require ( - golang.org/x/net v0.0.0-20210423184538-5f58ad60dda6 - golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7 // indirect - golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba // indirect - golang.zx2c4.com/go118/netip v0.0.0-20211105124833-002a02cb0e53 - golang.zx2c4.com/wireguard v0.0.0-20210424170727-c9db4b7aaa22 - gvisor.dev/gvisor v0.0.0-20211020211948-f76a604701b6 -) diff --git a/tun/netstack/go.sum b/tun/netstack/go.sum deleted file mode 100644 index 01bfbc7..0000000 --- a/tun/netstack/go.sum +++ /dev/null @@ -1,978 +0,0 @@ -bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8= -cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= -cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= -cloud.google.com/go v0.44.1/go.mod 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h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI= -sigs.k8s.io/structured-merge-diff/v4 v4.0.3/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw= -sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= -sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= diff --git a/tun/netstack/tun.go b/tun/netstack/tun.go index f1c03f4..2b73054 100644 --- a/tun/netstack/tun.go +++ b/tun/netstack/tun.go @@ -1,11 +1,12 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package netstack import ( + "bytes" "context" "crypto/rand" "encoding/binary" @@ -13,102 +14,64 @@ import ( "fmt" "io" "net" + "net/netip" "os" + "regexp" "strconv" "strings" + "syscall" "time" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/tun" "golang.org/x/net/dns/dnsmessage" + "gvisor.dev/gvisor/pkg/buffer" "gvisor.dev/gvisor/pkg/tcpip" "gvisor.dev/gvisor/pkg/tcpip/adapters/gonet" - "gvisor.dev/gvisor/pkg/tcpip/buffer" "gvisor.dev/gvisor/pkg/tcpip/header" + "gvisor.dev/gvisor/pkg/tcpip/link/channel" "gvisor.dev/gvisor/pkg/tcpip/network/ipv4" "gvisor.dev/gvisor/pkg/tcpip/network/ipv6" "gvisor.dev/gvisor/pkg/tcpip/stack" + "gvisor.dev/gvisor/pkg/tcpip/transport/icmp" "gvisor.dev/gvisor/pkg/tcpip/transport/tcp" "gvisor.dev/gvisor/pkg/tcpip/transport/udp" + "gvisor.dev/gvisor/pkg/waiter" ) type netTun struct { + ep *channel.Endpoint stack *stack.Stack - dispatcher stack.NetworkDispatcher events chan tun.Event - incomingPacket chan buffer.VectorisedView + incomingPacket chan *buffer.View mtu int dnsServers []netip.Addr hasV4, hasV6 bool } -type endpoint netTun -type Net netTun - -func (e *endpoint) Attach(dispatcher stack.NetworkDispatcher) { - e.dispatcher = dispatcher -} - -func (e *endpoint) IsAttached() bool { - return e.dispatcher != nil -} - -func (e *endpoint) MTU() uint32 { - mtu, err := (*netTun)(e).MTU() - if err != nil { - panic(err) - } - return uint32(mtu) -} - -func (*endpoint) Capabilities() stack.LinkEndpointCapabilities { - return stack.CapabilityNone -} - -func (*endpoint) MaxHeaderLength() uint16 { - return 0 -} - -func (*endpoint) LinkAddress() tcpip.LinkAddress { - return "" -} - -func (*endpoint) Wait() {} - -func (e *endpoint) WritePacket(_ stack.RouteInfo, _ tcpip.NetworkProtocolNumber, pkt *stack.PacketBuffer) tcpip.Error { - e.incomingPacket <- buffer.NewVectorisedView(pkt.Size(), pkt.Views()) - return nil -} - -func (e *endpoint) WritePackets(stack.RouteInfo, stack.PacketBufferList, tcpip.NetworkProtocolNumber) (int, tcpip.Error) { - panic("not implemented") -} - -func (e *endpoint) WriteRawPacket(*stack.PacketBuffer) tcpip.Error { - panic("not implemented") -} -func (*endpoint) ARPHardwareType() header.ARPHardwareType { - return header.ARPHardwareNone -} - -func (e *endpoint) AddHeader(tcpip.LinkAddress, tcpip.LinkAddress, tcpip.NetworkProtocolNumber, *stack.PacketBuffer) { -} +type Net netTun func CreateNetTUN(localAddresses, dnsServers []netip.Addr, mtu int) (tun.Device, *Net, error) { opts := stack.Options{ NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol}, - TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol}, + TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol, icmp.NewProtocol6, icmp.NewProtocol4}, HandleLocal: true, } dev := &netTun{ + ep: channel.New(1024, uint32(mtu), ""), stack: stack.New(opts), events: make(chan tun.Event, 10), - incomingPacket: make(chan buffer.VectorisedView), + incomingPacket: make(chan *buffer.View), dnsServers: dnsServers, mtu: mtu, } - tcpipErr := dev.stack.CreateNIC(1, (*endpoint)(dev)) + sackEnabledOpt := tcpip.TCPSACKEnabled(true) // TCP SACK is disabled by default + tcpipErr := dev.stack.SetTransportProtocolOption(tcp.ProtocolNumber, &sackEnabledOpt) + if tcpipErr != nil { + return nil, nil, fmt.Errorf("could not enable TCP SACK: %v", tcpipErr) + } + dev.ep.AddNotify(dev) + tcpipErr = dev.stack.CreateNIC(1, dev.ep) if tcpipErr != nil { return nil, nil, fmt.Errorf("CreateNIC: %v", tcpipErr) } @@ -121,7 +84,7 @@ func CreateNetTUN(localAddresses, dnsServers []netip.Addr, mtu int) (tun.Device, } protoAddr := tcpip.ProtocolAddress{ Protocol: protoNumber, - AddressWithPrefix: tcpip.Address(ip.AsSlice()).WithPrefix(), + AddressWithPrefix: tcpip.AddrFromSlice(ip.AsSlice()).WithPrefix(), } tcpipErr := dev.stack.AddProtocolAddress(1, protoAddr, stack.AddressProperties{}) if tcpipErr != nil { @@ -152,37 +115,54 @@ func (tun *netTun) File() *os.File { return nil } -func (tun *netTun) Events() chan tun.Event { +func (tun *netTun) Events() <-chan tun.Event { return tun.events } -func (tun *netTun) Read(buf []byte, offset int) (int, error) { +func (tun *netTun) Read(buf [][]byte, sizes []int, offset int) (int, error) { view, ok := <-tun.incomingPacket if !ok { return 0, os.ErrClosed } - return view.Read(buf[offset:]) -} -func (tun *netTun) Write(buf []byte, offset int) (int, error) { - packet := buf[offset:] - if len(packet) == 0 { - return 0, nil + n, err := view.Read(buf[0][offset:]) + if err != nil { + return 0, err } + sizes[0] = n + return 1, nil +} - pkb := stack.NewPacketBuffer(stack.PacketBufferOptions{Data: buffer.NewVectorisedView(len(packet), []buffer.View{buffer.NewViewFromBytes(packet)})}) - switch packet[0] >> 4 { - case 4: - tun.dispatcher.DeliverNetworkPacket("", "", ipv4.ProtocolNumber, pkb) - case 6: - tun.dispatcher.DeliverNetworkPacket("", "", ipv6.ProtocolNumber, pkb) - } +func (tun *netTun) Write(buf [][]byte, offset int) (int, error) { + for _, buf := range buf { + packet := buf[offset:] + if len(packet) == 0 { + continue + } + pkb := stack.NewPacketBuffer(stack.PacketBufferOptions{Payload: buffer.MakeWithData(packet)}) + switch packet[0] >> 4 { + case 4: + tun.ep.InjectInbound(header.IPv4ProtocolNumber, pkb) + case 6: + tun.ep.InjectInbound(header.IPv6ProtocolNumber, pkb) + default: + return 0, syscall.EAFNOSUPPORT + } + } return len(buf), nil } -func (tun *netTun) Flush() error { - return nil +func (tun *netTun) WriteNotify() { + pkt := tun.ep.Read() + if pkt.IsNil() { + return + } + + view := pkt.ToView() + pkt.DecRef() + + tun.incomingPacket <- view } func (tun *netTun) Close() error { @@ -191,9 +171,13 @@ func (tun *netTun) Close() error { if tun.events != nil { close(tun.events) } + + tun.ep.Close() + if tun.incomingPacket != nil { close(tun.incomingPacket) } + return nil } @@ -201,6 +185,10 @@ func (tun *netTun) MTU() (int, error) { return tun.mtu, nil } +func (tun *netTun) BatchSize() int { + return 1 +} + func convertToFullAddr(endpoint netip.AddrPort) (tcpip.FullAddress, tcpip.NetworkProtocolNumber) { var protoNumber tcpip.NetworkProtocolNumber if endpoint.Addr().Is4() { @@ -210,7 +198,7 @@ func convertToFullAddr(endpoint netip.AddrPort) (tcpip.FullAddress, tcpip.Networ } return tcpip.FullAddress{ NIC: 1, - Addr: tcpip.Address(endpoint.Addr().AsSlice()), + Addr: tcpip.AddrFromSlice(endpoint.Addr().AsSlice()), Port: endpoint.Port(), }, protoNumber } @@ -224,7 +212,8 @@ func (net *Net) DialContextTCP(ctx context.Context, addr *net.TCPAddr) (*gonet.T if addr == nil { return net.DialContextTCPAddrPort(ctx, netip.AddrPort{}) } - return net.DialContextTCPAddrPort(ctx, netip.AddrPortFrom(netip.AddrFromSlice(addr.IP), uint16(addr.Port))) + ip, _ := netip.AddrFromSlice(addr.IP) + return net.DialContextTCPAddrPort(ctx, netip.AddrPortFrom(ip, uint16(addr.Port))) } func (net *Net) DialTCPAddrPort(addr netip.AddrPort) (*gonet.TCPConn, error) { @@ -236,7 +225,8 @@ func (net *Net) DialTCP(addr *net.TCPAddr) (*gonet.TCPConn, error) { if addr == nil { return net.DialTCPAddrPort(netip.AddrPort{}) } - return net.DialTCPAddrPort(netip.AddrPortFrom(netip.AddrFromSlice(addr.IP), uint16(addr.Port))) + ip, _ := netip.AddrFromSlice(addr.IP) + return net.DialTCPAddrPort(netip.AddrPortFrom(ip, uint16(addr.Port))) } func (net *Net) ListenTCPAddrPort(addr netip.AddrPort) (*gonet.TCPListener, error) { @@ -248,7 +238,8 @@ func (net *Net) ListenTCP(addr *net.TCPAddr) (*gonet.TCPListener, error) { if addr == nil { return net.ListenTCPAddrPort(netip.AddrPort{}) } - return net.ListenTCPAddrPort(netip.AddrPortFrom(netip.AddrFromSlice(addr.IP), uint16(addr.Port))) + ip, _ := netip.AddrFromSlice(addr.IP) + return net.ListenTCPAddrPort(netip.AddrPortFrom(ip, uint16(addr.Port))) } func (net *Net) DialUDPAddrPort(laddr, raddr netip.AddrPort) (*gonet.UDPConn, error) { @@ -267,17 +258,221 @@ func (net *Net) DialUDPAddrPort(laddr, raddr netip.AddrPort) (*gonet.UDPConn, er return gonet.DialUDP(net.stack, lfa, rfa, pn) } +func (net *Net) ListenUDPAddrPort(laddr netip.AddrPort) (*gonet.UDPConn, error) { + return net.DialUDPAddrPort(laddr, netip.AddrPort{}) +} + func (net *Net) DialUDP(laddr, raddr *net.UDPAddr) (*gonet.UDPConn, error) { var la, ra netip.AddrPort if laddr != nil { - la = netip.AddrPortFrom(netip.AddrFromSlice(laddr.IP), uint16(laddr.Port)) + ip, _ := netip.AddrFromSlice(laddr.IP) + la = netip.AddrPortFrom(ip, uint16(laddr.Port)) } if raddr != nil { - ra = netip.AddrPortFrom(netip.AddrFromSlice(raddr.IP), uint16(raddr.Port)) + ip, _ := netip.AddrFromSlice(raddr.IP) + ra = netip.AddrPortFrom(ip, uint16(raddr.Port)) } return net.DialUDPAddrPort(la, ra) } +func (net *Net) ListenUDP(laddr *net.UDPAddr) (*gonet.UDPConn, error) { + return net.DialUDP(laddr, nil) +} + +type PingConn struct { + laddr PingAddr + raddr PingAddr + wq waiter.Queue + ep tcpip.Endpoint + deadline *time.Timer +} + +type PingAddr struct{ addr netip.Addr } + +func (ia PingAddr) String() string { + return ia.addr.String() +} + +func (ia PingAddr) Network() string { + if ia.addr.Is4() { + return "ping4" + } else if ia.addr.Is6() { + return "ping6" + } + return "ping" +} + +func (ia PingAddr) Addr() netip.Addr { + return ia.addr +} + +func PingAddrFromAddr(addr netip.Addr) *PingAddr { + return &PingAddr{addr} +} + +func (net *Net) DialPingAddr(laddr, raddr netip.Addr) (*PingConn, error) { + if !laddr.IsValid() && !raddr.IsValid() { + return nil, errors.New("ping dial: invalid address") + } + v6 := laddr.Is6() || raddr.Is6() + bind := laddr.IsValid() + if !bind { + if v6 { + laddr = netip.IPv6Unspecified() + } else { + laddr = netip.IPv4Unspecified() + } + } + + tn := icmp.ProtocolNumber4 + pn := ipv4.ProtocolNumber + if v6 { + tn = icmp.ProtocolNumber6 + pn = ipv6.ProtocolNumber + } + + pc := &PingConn{ + laddr: PingAddr{laddr}, + deadline: time.NewTimer(time.Hour << 10), + } + pc.deadline.Stop() + + ep, tcpipErr := net.stack.NewEndpoint(tn, pn, &pc.wq) + if tcpipErr != nil { + return nil, fmt.Errorf("ping socket: endpoint: %s", tcpipErr) + } + pc.ep = ep + + if bind { + fa, _ := convertToFullAddr(netip.AddrPortFrom(laddr, 0)) + if tcpipErr = pc.ep.Bind(fa); tcpipErr != nil { + return nil, fmt.Errorf("ping bind: %s", tcpipErr) + } + } + + if raddr.IsValid() { + pc.raddr = PingAddr{raddr} + fa, _ := convertToFullAddr(netip.AddrPortFrom(raddr, 0)) + if tcpipErr = pc.ep.Connect(fa); tcpipErr != nil { + return nil, fmt.Errorf("ping connect: %s", tcpipErr) + } + } + + return pc, nil +} + +func (net *Net) ListenPingAddr(laddr netip.Addr) (*PingConn, error) { + return net.DialPingAddr(laddr, netip.Addr{}) +} + +func (net *Net) DialPing(laddr, raddr *PingAddr) (*PingConn, error) { + var la, ra netip.Addr + if laddr != nil { + la = laddr.addr + } + if raddr != nil { + ra = raddr.addr + } + return net.DialPingAddr(la, ra) +} + +func (net *Net) ListenPing(laddr *PingAddr) (*PingConn, error) { + var la netip.Addr + if laddr != nil { + la = laddr.addr + } + return net.ListenPingAddr(la) +} + +func (pc *PingConn) LocalAddr() net.Addr { + return pc.laddr +} + +func (pc *PingConn) RemoteAddr() net.Addr { + return pc.raddr +} + +func (pc *PingConn) Close() error { + pc.deadline.Reset(0) + pc.ep.Close() + return nil +} + +func (pc *PingConn) SetWriteDeadline(t time.Time) error { + return errors.New("not implemented") +} + +func (pc *PingConn) WriteTo(p []byte, addr net.Addr) (n int, err error) { + var na netip.Addr + switch v := addr.(type) { + case *PingAddr: + na = v.addr + case *net.IPAddr: + na, _ = netip.AddrFromSlice(v.IP) + default: + return 0, fmt.Errorf("ping write: wrong net.Addr type") + } + if !((na.Is4() && pc.laddr.addr.Is4()) || (na.Is6() && pc.laddr.addr.Is6())) { + return 0, fmt.Errorf("ping write: mismatched protocols") + } + + buf := bytes.NewReader(p) + rfa, _ := convertToFullAddr(netip.AddrPortFrom(na, 0)) + // won't block, no deadlines + n64, tcpipErr := pc.ep.Write(buf, tcpip.WriteOptions{ + To: &rfa, + }) + if tcpipErr != nil { + return int(n64), fmt.Errorf("ping write: %s", tcpipErr) + } + + return int(n64), nil +} + +func (pc *PingConn) Write(p []byte) (n int, err error) { + return pc.WriteTo(p, &pc.raddr) +} + +func (pc *PingConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) { + e, notifyCh := waiter.NewChannelEntry(waiter.EventIn) + pc.wq.EventRegister(&e) + defer pc.wq.EventUnregister(&e) + + select { + case <-pc.deadline.C: + return 0, nil, os.ErrDeadlineExceeded + case <-notifyCh: + } + + w := tcpip.SliceWriter(p) + + res, tcpipErr := pc.ep.Read(&w, tcpip.ReadOptions{ + NeedRemoteAddr: true, + }) + if tcpipErr != nil { + return 0, nil, fmt.Errorf("ping read: %s", tcpipErr) + } + + remoteAddr, _ := netip.AddrFromSlice(res.RemoteAddr.Addr.AsSlice()) + return res.Count, &PingAddr{remoteAddr}, nil +} + +func (pc *PingConn) Read(p []byte) (n int, err error) { + n, _, err = pc.ReadFrom(p) + return +} + +func (pc *PingConn) SetDeadline(t time.Time) error { + // pc.SetWriteDeadline is unimplemented + + return pc.SetReadDeadline(t) +} + +func (pc *PingConn) SetReadDeadline(t time.Time) error { + pc.deadline.Reset(time.Until(t)) + return nil +} + var ( errNoSuchHost = errors.New("no such host") errLameReferral = errors.New("lame referral") @@ -476,7 +671,10 @@ func (tnet *Net) exchange(ctx context.Context, server netip.Addr, q dnsmessage.Q return dnsmessage.Parser{}, dnsmessage.Header{}, err } if d, ok := ctx.Deadline(); ok && !d.IsZero() { - c.SetDeadline(d) + err := c.SetDeadline(d) + if err != nil { + return dnsmessage.Parser{}, dnsmessage.Header{}, err + } } var p dnsmessage.Parser var h dnsmessage.Header @@ -714,7 +912,7 @@ func (tnet *Net) LookupContextHost(ctx context.Context, host string) ([]string, } } } - // We don't do RFC6724. Instead just put V6 addresess first if an IPv6 address is enabled + // We don't do RFC6724. Instead just put V6 addresses first if an IPv6 address is enabled var addrs []netip.Addr if tnet.hasV6 { addrs = append(addrsV6, addrsV4...) @@ -752,33 +950,38 @@ func partialDeadline(now, deadline time.Time, addrsRemaining int) (time.Time, er return now.Add(timeout), nil } +var protoSplitter = regexp.MustCompile(`^(tcp|udp|ping)(4|6)?$`) + func (tnet *Net) DialContext(ctx context.Context, network, address string) (net.Conn, error) { if ctx == nil { panic("nil context") } - var acceptV4, acceptV6, useUDP bool - if len(network) == 3 { + var acceptV4, acceptV6 bool + matches := protoSplitter.FindStringSubmatch(network) + if matches == nil { + return nil, &net.OpError{Op: "dial", Err: net.UnknownNetworkError(network)} + } else if len(matches[2]) == 0 { acceptV4 = true acceptV6 = true - } else if len(network) == 4 { - acceptV4 = network[3] == '4' - acceptV6 = network[3] == '6' - } - if !acceptV4 && !acceptV6 { - return nil, &net.OpError{Op: "dial", Err: net.UnknownNetworkError(network)} - } - if network[:3] == "udp" { - useUDP = true - } else if network[:3] != "tcp" { - return nil, &net.OpError{Op: "dial", Err: net.UnknownNetworkError(network)} - } - host, sport, err := net.SplitHostPort(address) - if err != nil { - return nil, &net.OpError{Op: "dial", Err: err} + } else { + acceptV4 = matches[2][0] == '4' + acceptV6 = !acceptV4 } - port, err := strconv.Atoi(sport) - if err != nil || port < 0 || port > 65535 { - return nil, &net.OpError{Op: "dial", Err: errNumericPort} + var host string + var port int + if matches[1] == "ping" { + host = address + } else { + var sport string + var err error + host, sport, err = net.SplitHostPort(address) + if err != nil { + return nil, &net.OpError{Op: "dial", Err: err} + } + port, err = strconv.Atoi(sport) + if err != nil || port < 0 || port > 65535 { + return nil, &net.OpError{Op: "dial", Err: errNumericPort} + } } allAddr, err := tnet.LookupContextHost(ctx, host) if err != nil { @@ -826,10 +1029,13 @@ func (tnet *Net) DialContext(ctx context.Context, network, address string) (net. } var c net.Conn - if useUDP { - c, err = tnet.DialUDPAddrPort(netip.AddrPort{}, addr) - } else { + switch matches[1] { + case "tcp": c, err = tnet.DialContextTCPAddrPort(dialCtx, addr) + case "udp": + c, err = tnet.DialUDPAddrPort(netip.AddrPort{}, addr) + case "ping": + c, err = tnet.DialPingAddr(netip.Addr{}, addr.Addr()) } if err == nil { return c, nil diff --git a/tun/offload_linux.go b/tun/offload_linux.go new file mode 100644 index 0000000..9ff7fea --- /dev/null +++ b/tun/offload_linux.go @@ -0,0 +1,993 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package tun + +import ( + "bytes" + "encoding/binary" + "errors" + "io" + "unsafe" + + "golang.org/x/sys/unix" + "golang.zx2c4.com/wireguard/conn" +) + +const tcpFlagsOffset = 13 + +const ( + tcpFlagFIN uint8 = 0x01 + tcpFlagPSH uint8 = 0x08 + tcpFlagACK uint8 = 0x10 +) + +// virtioNetHdr is defined in the kernel in include/uapi/linux/virtio_net.h. The +// kernel symbol is virtio_net_hdr. +type virtioNetHdr struct { + flags uint8 + gsoType uint8 + hdrLen uint16 + gsoSize uint16 + csumStart uint16 + csumOffset uint16 +} + +func (v *virtioNetHdr) decode(b []byte) error { + if len(b) < virtioNetHdrLen { + return io.ErrShortBuffer + } + copy(unsafe.Slice((*byte)(unsafe.Pointer(v)), virtioNetHdrLen), b[:virtioNetHdrLen]) + return nil +} + +func (v *virtioNetHdr) encode(b []byte) error { + if len(b) < virtioNetHdrLen { + return io.ErrShortBuffer + } + copy(b[:virtioNetHdrLen], unsafe.Slice((*byte)(unsafe.Pointer(v)), virtioNetHdrLen)) + return nil +} + +const ( + // virtioNetHdrLen is the length in bytes of virtioNetHdr. This matches the + // shape of the C ABI for its kernel counterpart -- sizeof(virtio_net_hdr). + virtioNetHdrLen = int(unsafe.Sizeof(virtioNetHdr{})) +) + +// tcpFlowKey represents the key for a TCP flow. +type tcpFlowKey struct { + srcAddr, dstAddr [16]byte + srcPort, dstPort uint16 + rxAck uint32 // varying ack values should not be coalesced. Treat them as separate flows. + isV6 bool +} + +// tcpGROTable holds flow and coalescing information for the purposes of TCP GRO. +type tcpGROTable struct { + itemsByFlow map[tcpFlowKey][]tcpGROItem + itemsPool [][]tcpGROItem +} + +func newTCPGROTable() *tcpGROTable { + t := &tcpGROTable{ + itemsByFlow: make(map[tcpFlowKey][]tcpGROItem, conn.IdealBatchSize), + itemsPool: make([][]tcpGROItem, conn.IdealBatchSize), + } + for i := range t.itemsPool { + t.itemsPool[i] = make([]tcpGROItem, 0, conn.IdealBatchSize) + } + return t +} + +func newTCPFlowKey(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset int) tcpFlowKey { + key := tcpFlowKey{} + addrSize := dstAddrOffset - srcAddrOffset + copy(key.srcAddr[:], pkt[srcAddrOffset:dstAddrOffset]) + copy(key.dstAddr[:], pkt[dstAddrOffset:dstAddrOffset+addrSize]) + key.srcPort = binary.BigEndian.Uint16(pkt[tcphOffset:]) + key.dstPort = binary.BigEndian.Uint16(pkt[tcphOffset+2:]) + key.rxAck = binary.BigEndian.Uint32(pkt[tcphOffset+8:]) + key.isV6 = addrSize == 16 + return key +} + +// lookupOrInsert looks up a flow for the provided packet and metadata, +// returning the packets found for the flow, or inserting a new one if none +// is found. +func (t *tcpGROTable) lookupOrInsert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex int) ([]tcpGROItem, bool) { + key := newTCPFlowKey(pkt, srcAddrOffset, dstAddrOffset, tcphOffset) + items, ok := t.itemsByFlow[key] + if ok { + return items, ok + } + // TODO: insert() performs another map lookup. This could be rearranged to avoid. + t.insert(pkt, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex) + return nil, false +} + +// insert an item in the table for the provided packet and packet metadata. +func (t *tcpGROTable) insert(pkt []byte, srcAddrOffset, dstAddrOffset, tcphOffset, tcphLen, bufsIndex int) { + key := newTCPFlowKey(pkt, srcAddrOffset, dstAddrOffset, tcphOffset) + item := tcpGROItem{ + key: key, + bufsIndex: uint16(bufsIndex), + gsoSize: uint16(len(pkt[tcphOffset+tcphLen:])), + iphLen: uint8(tcphOffset), + tcphLen: uint8(tcphLen), + sentSeq: binary.BigEndian.Uint32(pkt[tcphOffset+4:]), + pshSet: pkt[tcphOffset+tcpFlagsOffset]&tcpFlagPSH != 0, + } + items, ok := t.itemsByFlow[key] + if !ok { + items = t.newItems() + } + items = append(items, item) + t.itemsByFlow[key] = items +} + +func (t *tcpGROTable) updateAt(item tcpGROItem, i int) { + items, _ := t.itemsByFlow[item.key] + items[i] = item +} + +func (t *tcpGROTable) deleteAt(key tcpFlowKey, i int) { + items, _ := t.itemsByFlow[key] + items = append(items[:i], items[i+1:]...) + t.itemsByFlow[key] = items +} + +// tcpGROItem represents bookkeeping data for a TCP packet during the lifetime +// of a GRO evaluation across a vector of packets. +type tcpGROItem struct { + key tcpFlowKey + sentSeq uint32 // the sequence number + bufsIndex uint16 // the index into the original bufs slice + numMerged uint16 // the number of packets merged into this item + gsoSize uint16 // payload size + iphLen uint8 // ip header len + tcphLen uint8 // tcp header len + pshSet bool // psh flag is set +} + +func (t *tcpGROTable) newItems() []tcpGROItem { + var items []tcpGROItem + items, t.itemsPool = t.itemsPool[len(t.itemsPool)-1], t.itemsPool[:len(t.itemsPool)-1] + return items +} + +func (t *tcpGROTable) reset() { + for k, items := range t.itemsByFlow { + items = items[:0] + t.itemsPool = append(t.itemsPool, items) + delete(t.itemsByFlow, k) + } +} + +// udpFlowKey represents the key for a UDP flow. +type udpFlowKey struct { + srcAddr, dstAddr [16]byte + srcPort, dstPort uint16 + isV6 bool +} + +// udpGROTable holds flow and coalescing information for the purposes of UDP GRO. +type udpGROTable struct { + itemsByFlow map[udpFlowKey][]udpGROItem + itemsPool [][]udpGROItem +} + +func newUDPGROTable() *udpGROTable { + u := &udpGROTable{ + itemsByFlow: make(map[udpFlowKey][]udpGROItem, conn.IdealBatchSize), + itemsPool: make([][]udpGROItem, conn.IdealBatchSize), + } + for i := range u.itemsPool { + u.itemsPool[i] = make([]udpGROItem, 0, conn.IdealBatchSize) + } + return u +} + +func newUDPFlowKey(pkt []byte, srcAddrOffset, dstAddrOffset, udphOffset int) udpFlowKey { + key := udpFlowKey{} + addrSize := dstAddrOffset - srcAddrOffset + copy(key.srcAddr[:], pkt[srcAddrOffset:dstAddrOffset]) + copy(key.dstAddr[:], pkt[dstAddrOffset:dstAddrOffset+addrSize]) + key.srcPort = binary.BigEndian.Uint16(pkt[udphOffset:]) + key.dstPort = binary.BigEndian.Uint16(pkt[udphOffset+2:]) + key.isV6 = addrSize == 16 + return key +} + +// lookupOrInsert looks up a flow for the provided packet and metadata, +// returning the packets found for the flow, or inserting a new one if none +// is found. +func (u *udpGROTable) lookupOrInsert(pkt []byte, srcAddrOffset, dstAddrOffset, udphOffset, bufsIndex int) ([]udpGROItem, bool) { + key := newUDPFlowKey(pkt, srcAddrOffset, dstAddrOffset, udphOffset) + items, ok := u.itemsByFlow[key] + if ok { + return items, ok + } + // TODO: insert() performs another map lookup. This could be rearranged to avoid. + u.insert(pkt, srcAddrOffset, dstAddrOffset, udphOffset, bufsIndex, false) + return nil, false +} + +// insert an item in the table for the provided packet and packet metadata. +func (u *udpGROTable) insert(pkt []byte, srcAddrOffset, dstAddrOffset, udphOffset, bufsIndex int, cSumKnownInvalid bool) { + key := newUDPFlowKey(pkt, srcAddrOffset, dstAddrOffset, udphOffset) + item := udpGROItem{ + key: key, + bufsIndex: uint16(bufsIndex), + gsoSize: uint16(len(pkt[udphOffset+udphLen:])), + iphLen: uint8(udphOffset), + cSumKnownInvalid: cSumKnownInvalid, + } + items, ok := u.itemsByFlow[key] + if !ok { + items = u.newItems() + } + items = append(items, item) + u.itemsByFlow[key] = items +} + +func (u *udpGROTable) updateAt(item udpGROItem, i int) { + items, _ := u.itemsByFlow[item.key] + items[i] = item +} + +// udpGROItem represents bookkeeping data for a UDP packet during the lifetime +// of a GRO evaluation across a vector of packets. +type udpGROItem struct { + key udpFlowKey + bufsIndex uint16 // the index into the original bufs slice + numMerged uint16 // the number of packets merged into this item + gsoSize uint16 // payload size + iphLen uint8 // ip header len + cSumKnownInvalid bool // UDP header checksum validity; a false value DOES NOT imply valid, just unknown. +} + +func (u *udpGROTable) newItems() []udpGROItem { + var items []udpGROItem + items, u.itemsPool = u.itemsPool[len(u.itemsPool)-1], u.itemsPool[:len(u.itemsPool)-1] + return items +} + +func (u *udpGROTable) reset() { + for k, items := range u.itemsByFlow { + items = items[:0] + u.itemsPool = append(u.itemsPool, items) + delete(u.itemsByFlow, k) + } +} + +// canCoalesce represents the outcome of checking if two TCP packets are +// candidates for coalescing. +type canCoalesce int + +const ( + coalescePrepend canCoalesce = -1 + coalesceUnavailable canCoalesce = 0 + coalesceAppend canCoalesce = 1 +) + +// ipHeadersCanCoalesce returns true if the IP headers found in pktA and pktB +// meet all requirements to be merged as part of a GRO operation, otherwise it +// returns false. +func ipHeadersCanCoalesce(pktA, pktB []byte) bool { + if len(pktA) < 9 || len(pktB) < 9 { + return false + } + if pktA[0]>>4 == 6 { + if pktA[0] != pktB[0] || pktA[1]>>4 != pktB[1]>>4 { + // cannot coalesce with unequal Traffic class values + return false + } + if pktA[7] != pktB[7] { + // cannot coalesce with unequal Hop limit values + return false + } + } else { + if pktA[1] != pktB[1] { + // cannot coalesce with unequal ToS values + return false + } + if pktA[6]>>5 != pktB[6]>>5 { + // cannot coalesce with unequal DF or reserved bits. MF is checked + // further up the stack. + return false + } + if pktA[8] != pktB[8] { + // cannot coalesce with unequal TTL values + return false + } + } + return true +} + +// udpPacketsCanCoalesce evaluates if pkt can be coalesced with the packet +// described by item. iphLen and gsoSize describe pkt. bufs is the vector of +// packets involved in the current GRO evaluation. bufsOffset is the offset at +// which packet data begins within bufs. +func udpPacketsCanCoalesce(pkt []byte, iphLen uint8, gsoSize uint16, item udpGROItem, bufs [][]byte, bufsOffset int) canCoalesce { + pktTarget := bufs[item.bufsIndex][bufsOffset:] + if !ipHeadersCanCoalesce(pkt, pktTarget) { + return coalesceUnavailable + } + if len(pktTarget[iphLen+udphLen:])%int(item.gsoSize) != 0 { + // A smaller than gsoSize packet has been appended previously. + // Nothing can come after a smaller packet on the end. + return coalesceUnavailable + } + if gsoSize > item.gsoSize { + // We cannot have a larger packet following a smaller one. + return coalesceUnavailable + } + return coalesceAppend +} + +// tcpPacketsCanCoalesce evaluates if pkt can be coalesced with the packet +// described by item. This function makes considerations that match the kernel's +// GRO self tests, which can be found in tools/testing/selftests/net/gro.c. +func tcpPacketsCanCoalesce(pkt []byte, iphLen, tcphLen uint8, seq uint32, pshSet bool, gsoSize uint16, item tcpGROItem, bufs [][]byte, bufsOffset int) canCoalesce { + pktTarget := bufs[item.bufsIndex][bufsOffset:] + if tcphLen != item.tcphLen { + // cannot coalesce with unequal tcp options len + return coalesceUnavailable + } + if tcphLen > 20 { + if !bytes.Equal(pkt[iphLen+20:iphLen+tcphLen], pktTarget[item.iphLen+20:iphLen+tcphLen]) { + // cannot coalesce with unequal tcp options + return coalesceUnavailable + } + } + if !ipHeadersCanCoalesce(pkt, pktTarget) { + return coalesceUnavailable + } + // seq adjacency + lhsLen := item.gsoSize + lhsLen += item.numMerged * item.gsoSize + if seq == item.sentSeq+uint32(lhsLen) { // pkt aligns following item from a seq num perspective + if item.pshSet { + // We cannot append to a segment that has the PSH flag set, PSH + // can only be set on the final segment in a reassembled group. + return coalesceUnavailable + } + if len(pktTarget[iphLen+tcphLen:])%int(item.gsoSize) != 0 { + // A smaller than gsoSize packet has been appended previously. + // Nothing can come after a smaller packet on the end. + return coalesceUnavailable + } + if gsoSize > item.gsoSize { + // We cannot have a larger packet following a smaller one. + return coalesceUnavailable + } + return coalesceAppend + } else if seq+uint32(gsoSize) == item.sentSeq { // pkt aligns in front of item from a seq num perspective + if pshSet { + // We cannot prepend with a segment that has the PSH flag set, PSH + // can only be set on the final segment in a reassembled group. + return coalesceUnavailable + } + if gsoSize < item.gsoSize { + // We cannot have a larger packet following a smaller one. + return coalesceUnavailable + } + if gsoSize > item.gsoSize && item.numMerged > 0 { + // There's at least one previous merge, and we're larger than all + // previous. This would put multiple smaller packets on the end. + return coalesceUnavailable + } + return coalescePrepend + } + return coalesceUnavailable +} + +func checksumValid(pkt []byte, iphLen, proto uint8, isV6 bool) bool { + srcAddrAt := ipv4SrcAddrOffset + addrSize := 4 + if isV6 { + srcAddrAt = ipv6SrcAddrOffset + addrSize = 16 + } + lenForPseudo := uint16(len(pkt) - int(iphLen)) + cSum := pseudoHeaderChecksumNoFold(proto, pkt[srcAddrAt:srcAddrAt+addrSize], pkt[srcAddrAt+addrSize:srcAddrAt+addrSize*2], lenForPseudo) + return ^checksum(pkt[iphLen:], cSum) == 0 +} + +// coalesceResult represents the result of attempting to coalesce two TCP +// packets. +type coalesceResult int + +const ( + coalesceInsufficientCap coalesceResult = iota + coalescePSHEnding + coalesceItemInvalidCSum + coalescePktInvalidCSum + coalesceSuccess +) + +// coalesceUDPPackets attempts to coalesce pkt with the packet described by +// item, and returns the outcome. +func coalesceUDPPackets(pkt []byte, item *udpGROItem, bufs [][]byte, bufsOffset int, isV6 bool) coalesceResult { + pktHead := bufs[item.bufsIndex][bufsOffset:] // the packet that will end up at the front + headersLen := item.iphLen + udphLen + coalescedLen := len(bufs[item.bufsIndex][bufsOffset:]) + len(pkt) - int(headersLen) + + if cap(pktHead)-bufsOffset < coalescedLen { + // We don't want to allocate a new underlying array if capacity is + // too small. + return coalesceInsufficientCap + } + if item.numMerged == 0 { + if item.cSumKnownInvalid || !checksumValid(bufs[item.bufsIndex][bufsOffset:], item.iphLen, unix.IPPROTO_UDP, isV6) { + return coalesceItemInvalidCSum + } + } + if !checksumValid(pkt, item.iphLen, unix.IPPROTO_UDP, isV6) { + return coalescePktInvalidCSum + } + extendBy := len(pkt) - int(headersLen) + bufs[item.bufsIndex] = append(bufs[item.bufsIndex], make([]byte, extendBy)...) + copy(bufs[item.bufsIndex][bufsOffset+len(pktHead):], pkt[headersLen:]) + + item.numMerged++ + return coalesceSuccess +} + +// coalesceTCPPackets attempts to coalesce pkt with the packet described by +// item, and returns the outcome. This function may swap bufs elements in the +// event of a prepend as item's bufs index is already being tracked for writing +// to a Device. +func coalesceTCPPackets(mode canCoalesce, pkt []byte, pktBuffsIndex int, gsoSize uint16, seq uint32, pshSet bool, item *tcpGROItem, bufs [][]byte, bufsOffset int, isV6 bool) coalesceResult { + var pktHead []byte // the packet that will end up at the front + headersLen := item.iphLen + item.tcphLen + coalescedLen := len(bufs[item.bufsIndex][bufsOffset:]) + len(pkt) - int(headersLen) + + // Copy data + if mode == coalescePrepend { + pktHead = pkt + if cap(pkt)-bufsOffset < coalescedLen { + // We don't want to allocate a new underlying array if capacity is + // too small. + return coalesceInsufficientCap + } + if pshSet { + return coalescePSHEnding + } + if item.numMerged == 0 { + if !checksumValid(bufs[item.bufsIndex][bufsOffset:], item.iphLen, unix.IPPROTO_TCP, isV6) { + return coalesceItemInvalidCSum + } + } + if !checksumValid(pkt, item.iphLen, unix.IPPROTO_TCP, isV6) { + return coalescePktInvalidCSum + } + item.sentSeq = seq + extendBy := coalescedLen - len(pktHead) + bufs[pktBuffsIndex] = append(bufs[pktBuffsIndex], make([]byte, extendBy)...) + copy(bufs[pktBuffsIndex][bufsOffset+len(pkt):], bufs[item.bufsIndex][bufsOffset+int(headersLen):]) + // Flip the slice headers in bufs as part of prepend. The index of item + // is already being tracked for writing. + bufs[item.bufsIndex], bufs[pktBuffsIndex] = bufs[pktBuffsIndex], bufs[item.bufsIndex] + } else { + pktHead = bufs[item.bufsIndex][bufsOffset:] + if cap(pktHead)-bufsOffset < coalescedLen { + // We don't want to allocate a new underlying array if capacity is + // too small. + return coalesceInsufficientCap + } + if item.numMerged == 0 { + if !checksumValid(bufs[item.bufsIndex][bufsOffset:], item.iphLen, unix.IPPROTO_TCP, isV6) { + return coalesceItemInvalidCSum + } + } + if !checksumValid(pkt, item.iphLen, unix.IPPROTO_TCP, isV6) { + return coalescePktInvalidCSum + } + if pshSet { + // We are appending a segment with PSH set. + item.pshSet = pshSet + pktHead[item.iphLen+tcpFlagsOffset] |= tcpFlagPSH + } + extendBy := len(pkt) - int(headersLen) + bufs[item.bufsIndex] = append(bufs[item.bufsIndex], make([]byte, extendBy)...) + copy(bufs[item.bufsIndex][bufsOffset+len(pktHead):], pkt[headersLen:]) + } + + if gsoSize > item.gsoSize { + item.gsoSize = gsoSize + } + + item.numMerged++ + return coalesceSuccess +} + +const ( + ipv4FlagMoreFragments uint8 = 0x20 +) + +const ( + ipv4SrcAddrOffset = 12 + ipv6SrcAddrOffset = 8 + maxUint16 = 1<<16 - 1 +) + +type groResult int + +const ( + groResultNoop groResult = iota + groResultTableInsert + groResultCoalesced +) + +// tcpGRO evaluates the TCP packet at pktI in bufs for coalescing with +// existing packets tracked in table. It returns a groResultNoop when no +// action was taken, groResultTableInsert when the evaluated packet was +// inserted into table, and groResultCoalesced when the evaluated packet was +// coalesced with another packet in table. +func tcpGRO(bufs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool) groResult { + pkt := bufs[pktI][offset:] + if len(pkt) > maxUint16 { + // A valid IPv4 or IPv6 packet will never exceed this. + return groResultNoop + } + iphLen := int((pkt[0] & 0x0F) * 4) + if isV6 { + iphLen = 40 + ipv6HPayloadLen := int(binary.BigEndian.Uint16(pkt[4:])) + if ipv6HPayloadLen != len(pkt)-iphLen { + return groResultNoop + } + } else { + totalLen := int(binary.BigEndian.Uint16(pkt[2:])) + if totalLen != len(pkt) { + return groResultNoop + } + } + if len(pkt) < iphLen { + return groResultNoop + } + tcphLen := int((pkt[iphLen+12] >> 4) * 4) + if tcphLen < 20 || tcphLen > 60 { + return groResultNoop + } + if len(pkt) < iphLen+tcphLen { + return groResultNoop + } + if !isV6 { + if pkt[6]&ipv4FlagMoreFragments != 0 || pkt[6]<<3 != 0 || pkt[7] != 0 { + // no GRO support for fragmented segments for now + return groResultNoop + } + } + tcpFlags := pkt[iphLen+tcpFlagsOffset] + var pshSet bool + // not a candidate if any non-ACK flags (except PSH+ACK) are set + if tcpFlags != tcpFlagACK { + if pkt[iphLen+tcpFlagsOffset] != tcpFlagACK|tcpFlagPSH { + return groResultNoop + } + pshSet = true + } + gsoSize := uint16(len(pkt) - tcphLen - iphLen) + // not a candidate if payload len is 0 + if gsoSize < 1 { + return groResultNoop + } + seq := binary.BigEndian.Uint32(pkt[iphLen+4:]) + srcAddrOffset := ipv4SrcAddrOffset + addrLen := 4 + if isV6 { + srcAddrOffset = ipv6SrcAddrOffset + addrLen = 16 + } + items, existing := table.lookupOrInsert(pkt, srcAddrOffset, srcAddrOffset+addrLen, iphLen, tcphLen, pktI) + if !existing { + return groResultTableInsert + } + for i := len(items) - 1; i >= 0; i-- { + // In the best case of packets arriving in order iterating in reverse is + // more efficient if there are multiple items for a given flow. This + // also enables a natural table.deleteAt() in the + // coalesceItemInvalidCSum case without the need for index tracking. + // This algorithm makes a best effort to coalesce in the event of + // unordered packets, where pkt may land anywhere in items from a + // sequence number perspective, however once an item is inserted into + // the table it is never compared across other items later. + item := items[i] + can := tcpPacketsCanCoalesce(pkt, uint8(iphLen), uint8(tcphLen), seq, pshSet, gsoSize, item, bufs, offset) + if can != coalesceUnavailable { + result := coalesceTCPPackets(can, pkt, pktI, gsoSize, seq, pshSet, &item, bufs, offset, isV6) + switch result { + case coalesceSuccess: + table.updateAt(item, i) + return groResultCoalesced + case coalesceItemInvalidCSum: + // delete the item with an invalid csum + table.deleteAt(item.key, i) + case coalescePktInvalidCSum: + // no point in inserting an item that we can't coalesce + return groResultNoop + default: + } + } + } + // failed to coalesce with any other packets; store the item in the flow + table.insert(pkt, srcAddrOffset, srcAddrOffset+addrLen, iphLen, tcphLen, pktI) + return groResultTableInsert +} + +// applyTCPCoalesceAccounting updates bufs to account for coalescing based on the +// metadata found in table. +func applyTCPCoalesceAccounting(bufs [][]byte, offset int, table *tcpGROTable) error { + for _, items := range table.itemsByFlow { + for _, item := range items { + if item.numMerged > 0 { + hdr := virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, // this turns into CHECKSUM_PARTIAL in the skb + hdrLen: uint16(item.iphLen + item.tcphLen), + gsoSize: item.gsoSize, + csumStart: uint16(item.iphLen), + csumOffset: 16, + } + pkt := bufs[item.bufsIndex][offset:] + + // Recalculate the total len (IPv4) or payload len (IPv6). + // Recalculate the (IPv4) header checksum. + if item.key.isV6 { + hdr.gsoType = unix.VIRTIO_NET_HDR_GSO_TCPV6 + binary.BigEndian.PutUint16(pkt[4:], uint16(len(pkt))-uint16(item.iphLen)) // set new IPv6 header payload len + } else { + hdr.gsoType = unix.VIRTIO_NET_HDR_GSO_TCPV4 + pkt[10], pkt[11] = 0, 0 + binary.BigEndian.PutUint16(pkt[2:], uint16(len(pkt))) // set new total length + iphCSum := ^checksum(pkt[:item.iphLen], 0) // compute IPv4 header checksum + binary.BigEndian.PutUint16(pkt[10:], iphCSum) // set IPv4 header checksum field + } + err := hdr.encode(bufs[item.bufsIndex][offset-virtioNetHdrLen:]) + if err != nil { + return err + } + + // Calculate the pseudo header checksum and place it at the TCP + // checksum offset. Downstream checksum offloading will combine + // this with computation of the tcp header and payload checksum. + addrLen := 4 + addrOffset := ipv4SrcAddrOffset + if item.key.isV6 { + addrLen = 16 + addrOffset = ipv6SrcAddrOffset + } + srcAddrAt := offset + addrOffset + srcAddr := bufs[item.bufsIndex][srcAddrAt : srcAddrAt+addrLen] + dstAddr := bufs[item.bufsIndex][srcAddrAt+addrLen : srcAddrAt+addrLen*2] + psum := pseudoHeaderChecksumNoFold(unix.IPPROTO_TCP, srcAddr, dstAddr, uint16(len(pkt)-int(item.iphLen))) + binary.BigEndian.PutUint16(pkt[hdr.csumStart+hdr.csumOffset:], checksum([]byte{}, psum)) + } else { + hdr := virtioNetHdr{} + err := hdr.encode(bufs[item.bufsIndex][offset-virtioNetHdrLen:]) + if err != nil { + return err + } + } + } + } + return nil +} + +// applyUDPCoalesceAccounting updates bufs to account for coalescing based on the +// metadata found in table. +func applyUDPCoalesceAccounting(bufs [][]byte, offset int, table *udpGROTable) error { + for _, items := range table.itemsByFlow { + for _, item := range items { + if item.numMerged > 0 { + hdr := virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, // this turns into CHECKSUM_PARTIAL in the skb + hdrLen: uint16(item.iphLen + udphLen), + gsoSize: item.gsoSize, + csumStart: uint16(item.iphLen), + csumOffset: 6, + } + pkt := bufs[item.bufsIndex][offset:] + + // Recalculate the total len (IPv4) or payload len (IPv6). + // Recalculate the (IPv4) header checksum. + hdr.gsoType = unix.VIRTIO_NET_HDR_GSO_UDP_L4 + if item.key.isV6 { + binary.BigEndian.PutUint16(pkt[4:], uint16(len(pkt))-uint16(item.iphLen)) // set new IPv6 header payload len + } else { + pkt[10], pkt[11] = 0, 0 + binary.BigEndian.PutUint16(pkt[2:], uint16(len(pkt))) // set new total length + iphCSum := ^checksum(pkt[:item.iphLen], 0) // compute IPv4 header checksum + binary.BigEndian.PutUint16(pkt[10:], iphCSum) // set IPv4 header checksum field + } + err := hdr.encode(bufs[item.bufsIndex][offset-virtioNetHdrLen:]) + if err != nil { + return err + } + + // Recalculate the UDP len field value + binary.BigEndian.PutUint16(pkt[item.iphLen+4:], uint16(len(pkt[item.iphLen:]))) + + // Calculate the pseudo header checksum and place it at the UDP + // checksum offset. Downstream checksum offloading will combine + // this with computation of the udp header and payload checksum. + addrLen := 4 + addrOffset := ipv4SrcAddrOffset + if item.key.isV6 { + addrLen = 16 + addrOffset = ipv6SrcAddrOffset + } + srcAddrAt := offset + addrOffset + srcAddr := bufs[item.bufsIndex][srcAddrAt : srcAddrAt+addrLen] + dstAddr := bufs[item.bufsIndex][srcAddrAt+addrLen : srcAddrAt+addrLen*2] + psum := pseudoHeaderChecksumNoFold(unix.IPPROTO_UDP, srcAddr, dstAddr, uint16(len(pkt)-int(item.iphLen))) + binary.BigEndian.PutUint16(pkt[hdr.csumStart+hdr.csumOffset:], checksum([]byte{}, psum)) + } else { + hdr := virtioNetHdr{} + err := hdr.encode(bufs[item.bufsIndex][offset-virtioNetHdrLen:]) + if err != nil { + return err + } + } + } + } + return nil +} + +type groCandidateType uint8 + +const ( + notGROCandidate groCandidateType = iota + tcp4GROCandidate + tcp6GROCandidate + udp4GROCandidate + udp6GROCandidate +) + +func packetIsGROCandidate(b []byte, canUDPGRO bool) groCandidateType { + if len(b) < 28 { + return notGROCandidate + } + if b[0]>>4 == 4 { + if b[0]&0x0F != 5 { + // IPv4 packets w/IP options do not coalesce + return notGROCandidate + } + if b[9] == unix.IPPROTO_TCP && len(b) >= 40 { + return tcp4GROCandidate + } + if b[9] == unix.IPPROTO_UDP && canUDPGRO { + return udp4GROCandidate + } + } else if b[0]>>4 == 6 { + if b[6] == unix.IPPROTO_TCP && len(b) >= 60 { + return tcp6GROCandidate + } + if b[6] == unix.IPPROTO_UDP && len(b) >= 48 && canUDPGRO { + return udp6GROCandidate + } + } + return notGROCandidate +} + +const ( + udphLen = 8 +) + +// udpGRO evaluates the UDP packet at pktI in bufs for coalescing with +// existing packets tracked in table. It returns a groResultNoop when no +// action was taken, groResultTableInsert when the evaluated packet was +// inserted into table, and groResultCoalesced when the evaluated packet was +// coalesced with another packet in table. +func udpGRO(bufs [][]byte, offset int, pktI int, table *udpGROTable, isV6 bool) groResult { + pkt := bufs[pktI][offset:] + if len(pkt) > maxUint16 { + // A valid IPv4 or IPv6 packet will never exceed this. + return groResultNoop + } + iphLen := int((pkt[0] & 0x0F) * 4) + if isV6 { + iphLen = 40 + ipv6HPayloadLen := int(binary.BigEndian.Uint16(pkt[4:])) + if ipv6HPayloadLen != len(pkt)-iphLen { + return groResultNoop + } + } else { + totalLen := int(binary.BigEndian.Uint16(pkt[2:])) + if totalLen != len(pkt) { + return groResultNoop + } + } + if len(pkt) < iphLen { + return groResultNoop + } + if len(pkt) < iphLen+udphLen { + return groResultNoop + } + if !isV6 { + if pkt[6]&ipv4FlagMoreFragments != 0 || pkt[6]<<3 != 0 || pkt[7] != 0 { + // no GRO support for fragmented segments for now + return groResultNoop + } + } + gsoSize := uint16(len(pkt) - udphLen - iphLen) + // not a candidate if payload len is 0 + if gsoSize < 1 { + return groResultNoop + } + srcAddrOffset := ipv4SrcAddrOffset + addrLen := 4 + if isV6 { + srcAddrOffset = ipv6SrcAddrOffset + addrLen = 16 + } + items, existing := table.lookupOrInsert(pkt, srcAddrOffset, srcAddrOffset+addrLen, iphLen, pktI) + if !existing { + return groResultTableInsert + } + // With UDP we only check the last item, otherwise we could reorder packets + // for a given flow. We must also always insert a new item, or successfully + // coalesce with an existing item, for the same reason. + item := items[len(items)-1] + can := udpPacketsCanCoalesce(pkt, uint8(iphLen), gsoSize, item, bufs, offset) + var pktCSumKnownInvalid bool + if can == coalesceAppend { + result := coalesceUDPPackets(pkt, &item, bufs, offset, isV6) + switch result { + case coalesceSuccess: + table.updateAt(item, len(items)-1) + return groResultCoalesced + case coalesceItemInvalidCSum: + // If the existing item has an invalid csum we take no action. A new + // item will be stored after it, and the existing item will never be + // revisited as part of future coalescing candidacy checks. + case coalescePktInvalidCSum: + // We must insert a new item, but we also mark it as invalid csum + // to prevent a repeat checksum validation. + pktCSumKnownInvalid = true + default: + } + } + // failed to coalesce with any other packets; store the item in the flow + table.insert(pkt, srcAddrOffset, srcAddrOffset+addrLen, iphLen, pktI, pktCSumKnownInvalid) + return groResultTableInsert +} + +// handleGRO evaluates bufs for GRO, and writes the indices of the resulting +// packets into toWrite. toWrite, tcpTable, and udpTable should initially be +// empty (but non-nil), and are passed in to save allocs as the caller may reset +// and recycle them across vectors of packets. canUDPGRO indicates if UDP GRO is +// supported. +func handleGRO(bufs [][]byte, offset int, tcpTable *tcpGROTable, udpTable *udpGROTable, canUDPGRO bool, toWrite *[]int) error { + for i := range bufs { + if offset < virtioNetHdrLen || offset > len(bufs[i])-1 { + return errors.New("invalid offset") + } + var result groResult + switch packetIsGROCandidate(bufs[i][offset:], canUDPGRO) { + case tcp4GROCandidate: + result = tcpGRO(bufs, offset, i, tcpTable, false) + case tcp6GROCandidate: + result = tcpGRO(bufs, offset, i, tcpTable, true) + case udp4GROCandidate: + result = udpGRO(bufs, offset, i, udpTable, false) + case udp6GROCandidate: + result = udpGRO(bufs, offset, i, udpTable, true) + } + switch result { + case groResultNoop: + hdr := virtioNetHdr{} + err := hdr.encode(bufs[i][offset-virtioNetHdrLen:]) + if err != nil { + return err + } + fallthrough + case groResultTableInsert: + *toWrite = append(*toWrite, i) + } + } + errTCP := applyTCPCoalesceAccounting(bufs, offset, tcpTable) + errUDP := applyUDPCoalesceAccounting(bufs, offset, udpTable) + return errors.Join(errTCP, errUDP) +} + +// gsoSplit splits packets from in into outBuffs, writing the size of each +// element into sizes. It returns the number of buffers populated, and/or an +// error. +func gsoSplit(in []byte, hdr virtioNetHdr, outBuffs [][]byte, sizes []int, outOffset int, isV6 bool) (int, error) { + iphLen := int(hdr.csumStart) + srcAddrOffset := ipv6SrcAddrOffset + addrLen := 16 + if !isV6 { + in[10], in[11] = 0, 0 // clear ipv4 header checksum + srcAddrOffset = ipv4SrcAddrOffset + addrLen = 4 + } + transportCsumAt := int(hdr.csumStart + hdr.csumOffset) + in[transportCsumAt], in[transportCsumAt+1] = 0, 0 // clear tcp/udp checksum + var firstTCPSeqNum uint32 + var protocol uint8 + if hdr.gsoType == unix.VIRTIO_NET_HDR_GSO_TCPV4 || hdr.gsoType == unix.VIRTIO_NET_HDR_GSO_TCPV6 { + protocol = unix.IPPROTO_TCP + firstTCPSeqNum = binary.BigEndian.Uint32(in[hdr.csumStart+4:]) + } else { + protocol = unix.IPPROTO_UDP + } + nextSegmentDataAt := int(hdr.hdrLen) + i := 0 + for ; nextSegmentDataAt < len(in); i++ { + if i == len(outBuffs) { + return i - 1, ErrTooManySegments + } + nextSegmentEnd := nextSegmentDataAt + int(hdr.gsoSize) + if nextSegmentEnd > len(in) { + nextSegmentEnd = len(in) + } + segmentDataLen := nextSegmentEnd - nextSegmentDataAt + totalLen := int(hdr.hdrLen) + segmentDataLen + sizes[i] = totalLen + out := outBuffs[i][outOffset:] + + copy(out, in[:iphLen]) + if !isV6 { + // For IPv4 we are responsible for incrementing the ID field, + // updating the total len field, and recalculating the header + // checksum. + if i > 0 { + id := binary.BigEndian.Uint16(out[4:]) + id += uint16(i) + binary.BigEndian.PutUint16(out[4:], id) + } + binary.BigEndian.PutUint16(out[2:], uint16(totalLen)) + ipv4CSum := ^checksum(out[:iphLen], 0) + binary.BigEndian.PutUint16(out[10:], ipv4CSum) + } else { + // For IPv6 we are responsible for updating the payload length field. + binary.BigEndian.PutUint16(out[4:], uint16(totalLen-iphLen)) + } + + // copy transport header + copy(out[hdr.csumStart:hdr.hdrLen], in[hdr.csumStart:hdr.hdrLen]) + + if protocol == unix.IPPROTO_TCP { + // set TCP seq and adjust TCP flags + tcpSeq := firstTCPSeqNum + uint32(hdr.gsoSize*uint16(i)) + binary.BigEndian.PutUint32(out[hdr.csumStart+4:], tcpSeq) + if nextSegmentEnd != len(in) { + // FIN and PSH should only be set on last segment + clearFlags := tcpFlagFIN | tcpFlagPSH + out[hdr.csumStart+tcpFlagsOffset] &^= clearFlags + } + } else { + // set UDP header len + binary.BigEndian.PutUint16(out[hdr.csumStart+4:], uint16(segmentDataLen)+(hdr.hdrLen-hdr.csumStart)) + } + + // payload + copy(out[hdr.hdrLen:], in[nextSegmentDataAt:nextSegmentEnd]) + + // transport checksum + transportHeaderLen := int(hdr.hdrLen - hdr.csumStart) + lenForPseudo := uint16(transportHeaderLen + segmentDataLen) + transportCSumNoFold := pseudoHeaderChecksumNoFold(protocol, in[srcAddrOffset:srcAddrOffset+addrLen], in[srcAddrOffset+addrLen:srcAddrOffset+addrLen*2], lenForPseudo) + transportCSum := ^checksum(out[hdr.csumStart:totalLen], transportCSumNoFold) + binary.BigEndian.PutUint16(out[hdr.csumStart+hdr.csumOffset:], transportCSum) + + nextSegmentDataAt += int(hdr.gsoSize) + } + return i, nil +} + +func gsoNoneChecksum(in []byte, cSumStart, cSumOffset uint16) error { + cSumAt := cSumStart + cSumOffset + // The initial value at the checksum offset should be summed with the + // checksum we compute. This is typically the pseudo-header checksum. + initial := binary.BigEndian.Uint16(in[cSumAt:]) + in[cSumAt], in[cSumAt+1] = 0, 0 + binary.BigEndian.PutUint16(in[cSumAt:], ^checksum(in[cSumStart:], uint64(initial))) + return nil +} diff --git a/tun/offload_linux_test.go b/tun/offload_linux_test.go new file mode 100644 index 0000000..ae55c8c --- /dev/null +++ b/tun/offload_linux_test.go @@ -0,0 +1,752 @@ +/* SPDX-License-Identifier: MIT + * + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. + */ + +package tun + +import ( + "net/netip" + "testing" + + "golang.org/x/sys/unix" + "golang.zx2c4.com/wireguard/conn" + "gvisor.dev/gvisor/pkg/tcpip" + "gvisor.dev/gvisor/pkg/tcpip/header" +) + +const ( + offset = virtioNetHdrLen +) + +var ( + ip4PortA = netip.MustParseAddrPort("192.0.2.1:1") + ip4PortB = netip.MustParseAddrPort("192.0.2.2:1") + ip4PortC = netip.MustParseAddrPort("192.0.2.3:1") + ip6PortA = netip.MustParseAddrPort("[2001:db8::1]:1") + ip6PortB = netip.MustParseAddrPort("[2001:db8::2]:1") + ip6PortC = netip.MustParseAddrPort("[2001:db8::3]:1") +) + +func udp4PacketMutateIPFields(srcIPPort, dstIPPort netip.AddrPort, payloadLen int, ipFn func(*header.IPv4Fields)) []byte { + totalLen := 28 + payloadLen + b := make([]byte, offset+int(totalLen), 65535) + ipv4H := header.IPv4(b[offset:]) + srcAs4 := srcIPPort.Addr().As4() + dstAs4 := dstIPPort.Addr().As4() + ipFields := &header.IPv4Fields{ + SrcAddr: tcpip.AddrFromSlice(srcAs4[:]), + DstAddr: tcpip.AddrFromSlice(dstAs4[:]), + Protocol: unix.IPPROTO_UDP, + TTL: 64, + TotalLength: uint16(totalLen), + } + if ipFn != nil { + ipFn(ipFields) + } + ipv4H.Encode(ipFields) + udpH := header.UDP(b[offset+20:]) + udpH.Encode(&header.UDPFields{ + SrcPort: srcIPPort.Port(), + DstPort: dstIPPort.Port(), + Length: uint16(payloadLen + udphLen), + }) + ipv4H.SetChecksum(^ipv4H.CalculateChecksum()) + pseudoCsum := header.PseudoHeaderChecksum(unix.IPPROTO_UDP, ipv4H.SourceAddress(), ipv4H.DestinationAddress(), uint16(udphLen+payloadLen)) + udpH.SetChecksum(^udpH.CalculateChecksum(pseudoCsum)) + return b +} + +func udp6Packet(srcIPPort, dstIPPort netip.AddrPort, payloadLen int) []byte { + return udp6PacketMutateIPFields(srcIPPort, dstIPPort, payloadLen, nil) +} + +func udp6PacketMutateIPFields(srcIPPort, dstIPPort netip.AddrPort, payloadLen int, ipFn func(*header.IPv6Fields)) []byte { + totalLen := 48 + payloadLen + b := make([]byte, offset+int(totalLen), 65535) + ipv6H := header.IPv6(b[offset:]) + srcAs16 := srcIPPort.Addr().As16() + dstAs16 := dstIPPort.Addr().As16() + ipFields := &header.IPv6Fields{ + SrcAddr: tcpip.AddrFromSlice(srcAs16[:]), + DstAddr: tcpip.AddrFromSlice(dstAs16[:]), + TransportProtocol: unix.IPPROTO_UDP, + HopLimit: 64, + PayloadLength: uint16(payloadLen + udphLen), + } + if ipFn != nil { + ipFn(ipFields) + } + ipv6H.Encode(ipFields) + udpH := header.UDP(b[offset+40:]) + udpH.Encode(&header.UDPFields{ + SrcPort: srcIPPort.Port(), + DstPort: dstIPPort.Port(), + Length: uint16(payloadLen + udphLen), + }) + pseudoCsum := header.PseudoHeaderChecksum(unix.IPPROTO_UDP, ipv6H.SourceAddress(), ipv6H.DestinationAddress(), uint16(udphLen+payloadLen)) + udpH.SetChecksum(^udpH.CalculateChecksum(pseudoCsum)) + return b +} + +func udp4Packet(srcIPPort, dstIPPort netip.AddrPort, payloadLen int) []byte { + return udp4PacketMutateIPFields(srcIPPort, dstIPPort, payloadLen, nil) +} + +func tcp4PacketMutateIPFields(srcIPPort, dstIPPort netip.AddrPort, flags header.TCPFlags, segmentSize, seq uint32, ipFn func(*header.IPv4Fields)) []byte { + totalLen := 40 + segmentSize + b := make([]byte, offset+int(totalLen), 65535) + ipv4H := header.IPv4(b[offset:]) + srcAs4 := srcIPPort.Addr().As4() + dstAs4 := dstIPPort.Addr().As4() + ipFields := &header.IPv4Fields{ + SrcAddr: tcpip.AddrFromSlice(srcAs4[:]), + DstAddr: tcpip.AddrFromSlice(dstAs4[:]), + Protocol: unix.IPPROTO_TCP, + TTL: 64, + TotalLength: uint16(totalLen), + } + if ipFn != nil { + ipFn(ipFields) + } + ipv4H.Encode(ipFields) + tcpH := header.TCP(b[offset+20:]) + tcpH.Encode(&header.TCPFields{ + SrcPort: srcIPPort.Port(), + DstPort: dstIPPort.Port(), + SeqNum: seq, + AckNum: 1, + DataOffset: 20, + Flags: flags, + WindowSize: 3000, + }) + ipv4H.SetChecksum(^ipv4H.CalculateChecksum()) + pseudoCsum := header.PseudoHeaderChecksum(unix.IPPROTO_TCP, ipv4H.SourceAddress(), ipv4H.DestinationAddress(), uint16(20+segmentSize)) + tcpH.SetChecksum(^tcpH.CalculateChecksum(pseudoCsum)) + return b +} + +func tcp4Packet(srcIPPort, dstIPPort netip.AddrPort, flags header.TCPFlags, segmentSize, seq uint32) []byte { + return tcp4PacketMutateIPFields(srcIPPort, dstIPPort, flags, segmentSize, seq, nil) +} + +func tcp6PacketMutateIPFields(srcIPPort, dstIPPort netip.AddrPort, flags header.TCPFlags, segmentSize, seq uint32, ipFn func(*header.IPv6Fields)) []byte { + totalLen := 60 + segmentSize + b := make([]byte, offset+int(totalLen), 65535) + ipv6H := header.IPv6(b[offset:]) + srcAs16 := srcIPPort.Addr().As16() + dstAs16 := dstIPPort.Addr().As16() + ipFields := &header.IPv6Fields{ + SrcAddr: tcpip.AddrFromSlice(srcAs16[:]), + DstAddr: tcpip.AddrFromSlice(dstAs16[:]), + TransportProtocol: unix.IPPROTO_TCP, + HopLimit: 64, + PayloadLength: uint16(segmentSize + 20), + } + if ipFn != nil { + ipFn(ipFields) + } + ipv6H.Encode(ipFields) + tcpH := header.TCP(b[offset+40:]) + tcpH.Encode(&header.TCPFields{ + SrcPort: srcIPPort.Port(), + DstPort: dstIPPort.Port(), + SeqNum: seq, + AckNum: 1, + DataOffset: 20, + Flags: flags, + WindowSize: 3000, + }) + pseudoCsum := header.PseudoHeaderChecksum(unix.IPPROTO_TCP, ipv6H.SourceAddress(), ipv6H.DestinationAddress(), uint16(20+segmentSize)) + tcpH.SetChecksum(^tcpH.CalculateChecksum(pseudoCsum)) + return b +} + +func tcp6Packet(srcIPPort, dstIPPort netip.AddrPort, flags header.TCPFlags, segmentSize, seq uint32) []byte { + return tcp6PacketMutateIPFields(srcIPPort, dstIPPort, flags, segmentSize, seq, nil) +} + +func Test_handleVirtioRead(t *testing.T) { + tests := []struct { + name string + hdr virtioNetHdr + pktIn []byte + wantLens []int + wantErr bool + }{ + { + "tcp4", + virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, + gsoType: unix.VIRTIO_NET_HDR_GSO_TCPV4, + gsoSize: 100, + hdrLen: 40, + csumStart: 20, + csumOffset: 16, + }, + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck|header.TCPFlagPsh, 200, 1), + []int{140, 140}, + false, + }, + { + "tcp6", + virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, + gsoType: unix.VIRTIO_NET_HDR_GSO_TCPV6, + gsoSize: 100, + hdrLen: 60, + csumStart: 40, + csumOffset: 16, + }, + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck|header.TCPFlagPsh, 200, 1), + []int{160, 160}, + false, + }, + { + "udp4", + virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, + gsoType: unix.VIRTIO_NET_HDR_GSO_UDP_L4, + gsoSize: 100, + hdrLen: 28, + csumStart: 20, + csumOffset: 6, + }, + udp4Packet(ip4PortA, ip4PortB, 200), + []int{128, 128}, + false, + }, + { + "udp6", + virtioNetHdr{ + flags: unix.VIRTIO_NET_HDR_F_NEEDS_CSUM, + gsoType: unix.VIRTIO_NET_HDR_GSO_UDP_L4, + gsoSize: 100, + hdrLen: 48, + csumStart: 40, + csumOffset: 6, + }, + udp6Packet(ip6PortA, ip6PortB, 200), + []int{148, 148}, + false, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + out := make([][]byte, conn.IdealBatchSize) + sizes := make([]int, conn.IdealBatchSize) + for i := range out { + out[i] = make([]byte, 65535) + } + tt.hdr.encode(tt.pktIn) + n, err := handleVirtioRead(tt.pktIn, out, sizes, offset) + if err != nil { + if tt.wantErr { + return + } + t.Fatalf("got err: %v", err) + } + if n != len(tt.wantLens) { + t.Fatalf("got %d packets, wanted %d", n, len(tt.wantLens)) + } + for i := range tt.wantLens { + if tt.wantLens[i] != sizes[i] { + t.Fatalf("wantLens[%d]: %d != outSizes: %d", i, tt.wantLens[i], sizes[i]) + } + } + }) + } +} + +func flipTCP4Checksum(b []byte) []byte { + at := virtioNetHdrLen + 20 + 16 // 20 byte ipv4 header; tcp csum offset is 16 + b[at] ^= 0xFF + b[at+1] ^= 0xFF + return b +} + +func flipUDP4Checksum(b []byte) []byte { + at := virtioNetHdrLen + 20 + 6 // 20 byte ipv4 header; udp csum offset is 6 + b[at] ^= 0xFF + b[at+1] ^= 0xFF + return b +} + +func Fuzz_handleGRO(f *testing.F) { + pkt0 := tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1) + pkt1 := tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101) + pkt2 := tcp4Packet(ip4PortA, ip4PortC, header.TCPFlagAck, 100, 201) + pkt3 := tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1) + pkt4 := tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 101) + pkt5 := tcp6Packet(ip6PortA, ip6PortC, header.TCPFlagAck, 100, 201) + pkt6 := udp4Packet(ip4PortA, ip4PortB, 100) + pkt7 := udp4Packet(ip4PortA, ip4PortB, 100) + pkt8 := udp4Packet(ip4PortA, ip4PortC, 100) + pkt9 := udp6Packet(ip6PortA, ip6PortB, 100) + pkt10 := udp6Packet(ip6PortA, ip6PortB, 100) + pkt11 := udp6Packet(ip6PortA, ip6PortC, 100) + f.Add(pkt0, pkt1, pkt2, pkt3, pkt4, pkt5, pkt6, pkt7, pkt8, pkt9, pkt10, pkt11, true, offset) + f.Fuzz(func(t *testing.T, pkt0, pkt1, pkt2, pkt3, pkt4, pkt5, pkt6, pkt7, pkt8, pkt9, pkt10, pkt11 []byte, canUDPGRO bool, offset int) { + pkts := [][]byte{pkt0, pkt1, pkt2, pkt3, pkt4, pkt5, pkt6, pkt7, pkt8, pkt9, pkt10, pkt11} + toWrite := make([]int, 0, len(pkts)) + handleGRO(pkts, offset, newTCPGROTable(), newUDPGROTable(), canUDPGRO, &toWrite) + if len(toWrite) > len(pkts) { + t.Errorf("len(toWrite): %d > len(pkts): %d", len(toWrite), len(pkts)) + } + seenWriteI := make(map[int]bool) + for _, writeI := range toWrite { + if writeI < 0 || writeI > len(pkts)-1 { + t.Errorf("toWrite value (%d) outside bounds of len(pkts): %d", writeI, len(pkts)) + } + if seenWriteI[writeI] { + t.Errorf("duplicate toWrite value: %d", writeI) + } + seenWriteI[writeI] = true + } + }) +} + +func Test_handleGRO(t *testing.T) { + tests := []struct { + name string + pktsIn [][]byte + canUDPGRO bool + wantToWrite []int + wantLens []int + wantErr bool + }{ + { + "multiple protocols and flows", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), // tcp4 flow 1 + udp4Packet(ip4PortA, ip4PortB, 100), // udp4 flow 1 + udp4Packet(ip4PortA, ip4PortC, 100), // udp4 flow 2 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101), // tcp4 flow 1 + tcp4Packet(ip4PortA, ip4PortC, header.TCPFlagAck, 100, 201), // tcp4 flow 2 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1), // tcp6 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 101), // tcp6 flow 1 + tcp6Packet(ip6PortA, ip6PortC, header.TCPFlagAck, 100, 201), // tcp6 flow 2 + udp4Packet(ip4PortA, ip4PortB, 100), // udp4 flow 1 + udp6Packet(ip6PortA, ip6PortB, 100), // udp6 flow 1 + udp6Packet(ip6PortA, ip6PortB, 100), // udp6 flow 1 + }, + true, + []int{0, 1, 2, 4, 5, 7, 9}, + []int{240, 228, 128, 140, 260, 160, 248}, + false, + }, + { + "multiple protocols and flows no UDP GRO", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), // tcp4 flow 1 + udp4Packet(ip4PortA, ip4PortB, 100), // udp4 flow 1 + udp4Packet(ip4PortA, ip4PortC, 100), // udp4 flow 2 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101), // tcp4 flow 1 + tcp4Packet(ip4PortA, ip4PortC, header.TCPFlagAck, 100, 201), // tcp4 flow 2 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1), // tcp6 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 101), // tcp6 flow 1 + tcp6Packet(ip6PortA, ip6PortC, header.TCPFlagAck, 100, 201), // tcp6 flow 2 + udp4Packet(ip4PortA, ip4PortB, 100), // udp4 flow 1 + udp6Packet(ip6PortA, ip6PortB, 100), // udp6 flow 1 + udp6Packet(ip6PortA, ip6PortB, 100), // udp6 flow 1 + }, + false, + []int{0, 1, 2, 4, 5, 7, 8, 9, 10}, + []int{240, 128, 128, 140, 260, 160, 128, 148, 148}, + false, + }, + { + "PSH interleaved", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), // v4 flow 1 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck|header.TCPFlagPsh, 100, 101), // v4 flow 1 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 201), // v4 flow 1 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 301), // v4 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1), // v6 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck|header.TCPFlagPsh, 100, 101), // v6 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 201), // v6 flow 1 + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 301), // v6 flow 1 + }, + true, + []int{0, 2, 4, 6}, + []int{240, 240, 260, 260}, + false, + }, + { + "coalesceItemInvalidCSum", + [][]byte{ + flipTCP4Checksum(tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1)), // v4 flow 1 seq 1 len 100 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101), // v4 flow 1 seq 101 len 100 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 201), // v4 flow 1 seq 201 len 100 + flipUDP4Checksum(udp4Packet(ip4PortA, ip4PortB, 100)), + udp4Packet(ip4PortA, ip4PortB, 100), + udp4Packet(ip4PortA, ip4PortB, 100), + }, + true, + []int{0, 1, 3, 4}, + []int{140, 240, 128, 228}, + false, + }, + { + "out of order", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101), // v4 flow 1 seq 101 len 100 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), // v4 flow 1 seq 1 len 100 + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 201), // v4 flow 1 seq 201 len 100 + }, + true, + []int{0}, + []int{340}, + false, + }, + { + "unequal TTL", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), + tcp4PacketMutateIPFields(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv4Fields) { + fields.TTL++ + }), + udp4Packet(ip4PortA, ip4PortB, 100), + udp4PacketMutateIPFields(ip4PortA, ip4PortB, 100, func(fields *header.IPv4Fields) { + fields.TTL++ + }), + }, + true, + []int{0, 1, 2, 3}, + []int{140, 140, 128, 128}, + false, + }, + { + "unequal ToS", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), + tcp4PacketMutateIPFields(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv4Fields) { + fields.TOS++ + }), + udp4Packet(ip4PortA, ip4PortB, 100), + udp4PacketMutateIPFields(ip4PortA, ip4PortB, 100, func(fields *header.IPv4Fields) { + fields.TOS++ + }), + }, + true, + []int{0, 1, 2, 3}, + []int{140, 140, 128, 128}, + false, + }, + { + "unequal flags more fragments set", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), + tcp4PacketMutateIPFields(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv4Fields) { + fields.Flags = 1 + }), + udp4Packet(ip4PortA, ip4PortB, 100), + udp4PacketMutateIPFields(ip4PortA, ip4PortB, 100, func(fields *header.IPv4Fields) { + fields.Flags = 1 + }), + }, + true, + []int{0, 1, 2, 3}, + []int{140, 140, 128, 128}, + false, + }, + { + "unequal flags DF set", + [][]byte{ + tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1), + tcp4PacketMutateIPFields(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv4Fields) { + fields.Flags = 2 + }), + udp4Packet(ip4PortA, ip4PortB, 100), + udp4PacketMutateIPFields(ip4PortA, ip4PortB, 100, func(fields *header.IPv4Fields) { + fields.Flags = 2 + }), + }, + true, + []int{0, 1, 2, 3}, + []int{140, 140, 128, 128}, + false, + }, + { + "ipv6 unequal hop limit", + [][]byte{ + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1), + tcp6PacketMutateIPFields(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv6Fields) { + fields.HopLimit++ + }), + udp6Packet(ip6PortA, ip6PortB, 100), + udp6PacketMutateIPFields(ip6PortA, ip6PortB, 100, func(fields *header.IPv6Fields) { + fields.HopLimit++ + }), + }, + true, + []int{0, 1, 2, 3}, + []int{160, 160, 148, 148}, + false, + }, + { + "ipv6 unequal traffic class", + [][]byte{ + tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1), + tcp6PacketMutateIPFields(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 101, func(fields *header.IPv6Fields) { + fields.TrafficClass++ + }), + udp6Packet(ip6PortA, ip6PortB, 100), + udp6PacketMutateIPFields(ip6PortA, ip6PortB, 100, func(fields *header.IPv6Fields) { + fields.TrafficClass++ + }), + }, + true, + []int{0, 1, 2, 3}, + []int{160, 160, 148, 148}, + false, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + toWrite := make([]int, 0, len(tt.pktsIn)) + err := handleGRO(tt.pktsIn, offset, newTCPGROTable(), newUDPGROTable(), tt.canUDPGRO, &toWrite) + if err != nil { + if tt.wantErr { + return + } + t.Fatalf("got err: %v", err) + } + if len(toWrite) != len(tt.wantToWrite) { + t.Fatalf("got %d packets, wanted %d", len(toWrite), len(tt.wantToWrite)) + } + for i, pktI := range tt.wantToWrite { + if tt.wantToWrite[i] != toWrite[i] { + t.Fatalf("wantToWrite[%d]: %d != toWrite: %d", i, tt.wantToWrite[i], toWrite[i]) + } + if tt.wantLens[i] != len(tt.pktsIn[pktI][offset:]) { + t.Errorf("wanted len %d packet at %d, got: %d", tt.wantLens[i], i, len(tt.pktsIn[pktI][offset:])) + } + } + }) + } +} + +func Test_packetIsGROCandidate(t *testing.T) { + tcp4 := tcp4Packet(ip4PortA, ip4PortB, header.TCPFlagAck, 100, 1)[virtioNetHdrLen:] + tcp4TooShort := tcp4[:39] + ip4InvalidHeaderLen := make([]byte, len(tcp4)) + copy(ip4InvalidHeaderLen, tcp4) + ip4InvalidHeaderLen[0] = 0x46 + ip4InvalidProtocol := make([]byte, len(tcp4)) + copy(ip4InvalidProtocol, tcp4) + ip4InvalidProtocol[9] = unix.IPPROTO_GRE + + tcp6 := tcp6Packet(ip6PortA, ip6PortB, header.TCPFlagAck, 100, 1)[virtioNetHdrLen:] + tcp6TooShort := tcp6[:59] + ip6InvalidProtocol := make([]byte, len(tcp6)) + copy(ip6InvalidProtocol, tcp6) + ip6InvalidProtocol[6] = unix.IPPROTO_GRE + + udp4 := udp4Packet(ip4PortA, ip4PortB, 100)[virtioNetHdrLen:] + udp4TooShort := udp4[:27] + + udp6 := udp6Packet(ip6PortA, ip6PortB, 100)[virtioNetHdrLen:] + udp6TooShort := udp6[:47] + + tests := []struct { + name string + b []byte + canUDPGRO bool + want groCandidateType + }{ + { + "tcp4", + tcp4, + true, + tcp4GROCandidate, + }, + { + "tcp6", + tcp6, + true, + tcp6GROCandidate, + }, + { + "udp4", + udp4, + true, + udp4GROCandidate, + }, + { + "udp4 no support", + udp4, + false, + notGROCandidate, + }, + { + "udp6", + udp6, + true, + udp6GROCandidate, + }, + { + "udp6 no support", + udp6, + false, + notGROCandidate, + }, + { + "udp4 too short", + udp4TooShort, + true, + notGROCandidate, + }, + { + "udp6 too short", + udp6TooShort, + true, + notGROCandidate, + }, + { + "tcp4 too short", + tcp4TooShort, + true, + notGROCandidate, + }, + { + "tcp6 too short", + tcp6TooShort, + true, + notGROCandidate, + }, + { + "invalid IP version", + []byte{0x00}, + true, + notGROCandidate, + }, + { + "invalid IP header len", + ip4InvalidHeaderLen, + true, + notGROCandidate, + }, + { + "ip4 invalid protocol", + ip4InvalidProtocol, + true, + notGROCandidate, + }, + { + "ip6 invalid protocol", + ip6InvalidProtocol, + true, + notGROCandidate, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + if got := packetIsGROCandidate(tt.b, tt.canUDPGRO); got != tt.want { + t.Errorf("packetIsGROCandidate() = %v, want %v", got, tt.want) + } + }) + } +} + +func Test_udpPacketsCanCoalesce(t *testing.T) { + udp4a := udp4Packet(ip4PortA, ip4PortB, 100) + udp4b := udp4Packet(ip4PortA, ip4PortB, 100) + udp4c := udp4Packet(ip4PortA, ip4PortB, 110) + + type args struct { + pkt []byte + iphLen uint8 + gsoSize uint16 + item udpGROItem + bufs [][]byte + bufsOffset int + } + tests := []struct { + name string + args args + want canCoalesce + }{ + { + "coalesceAppend equal gso", + args{ + pkt: udp4a[offset:], + iphLen: 20, + gsoSize: 100, + item: udpGROItem{ + gsoSize: 100, + iphLen: 20, + }, + bufs: [][]byte{ + udp4a, + udp4b, + }, + bufsOffset: offset, + }, + coalesceAppend, + }, + { + "coalesceAppend smaller gso", + args{ + pkt: udp4a[offset : len(udp4a)-90], + iphLen: 20, + gsoSize: 10, + item: udpGROItem{ + gsoSize: 100, + iphLen: 20, + }, + bufs: [][]byte{ + udp4a, + udp4b, + }, + bufsOffset: offset, + }, + coalesceAppend, + }, + { + "coalesceUnavailable smaller gso previously appended", + args{ + pkt: udp4a[offset:], + iphLen: 20, + gsoSize: 100, + item: udpGROItem{ + gsoSize: 100, + iphLen: 20, + }, + bufs: [][]byte{ + udp4c, + udp4b, + }, + bufsOffset: offset, + }, + coalesceUnavailable, + }, + { + "coalesceUnavailable larger following smaller", + args{ + pkt: udp4c[offset:], + iphLen: 20, + gsoSize: 110, + item: udpGROItem{ + gsoSize: 100, + iphLen: 20, + }, + bufs: [][]byte{ + udp4a, + udp4c, + }, + bufsOffset: offset, + }, + coalesceUnavailable, + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + if got := udpPacketsCanCoalesce(tt.args.pkt, tt.args.iphLen, tt.args.gsoSize, tt.args.item, tt.args.bufs, tt.args.bufsOffset); got != tt.want { + t.Errorf("udpPacketsCanCoalesce() = %v, want %v", got, tt.want) + } + }) + } +} diff --git a/tun/operateonfd.go b/tun/operateonfd.go index 70d8a07..f1beb6d 100644 --- a/tun/operateonfd.go +++ b/tun/operateonfd.go @@ -2,7 +2,7 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -18,12 +18,36 @@ const ( ) type Device interface { - File() *os.File // returns the file descriptor of the device - Read([]byte, int) (int, error) // read a packet from the device (without any additional headers) - Write([]byte, int) (int, error) // writes a packet to the device (without any additional headers) - Flush() error // flush all previous writes to the device - MTU() (int, error) // returns the MTU of the device - Name() (string, error) // fetches and returns the current name - Events() chan Event // returns a constant channel of events related to the device - Close() error // stops the device and closes the event channel + // File returns the file descriptor of the device. + File() *os.File + + // Read one or more packets from the Device (without any additional headers). + // On a successful read it returns the number of packets read, and sets + // packet lengths within the sizes slice. len(sizes) must be >= len(bufs). + // A nonzero offset can be used to instruct the Device on where to begin + // reading into each element of the bufs slice. + Read(bufs [][]byte, sizes []int, offset int) (n int, err error) + + // Write one or more packets to the device (without any additional headers). + // On a successful write it returns the number of packets written. A nonzero + // offset can be used to instruct the Device on where to begin writing from + // each packet contained within the bufs slice. + Write(bufs [][]byte, offset int) (int, error) + + // MTU returns the MTU of the Device. + MTU() (int, error) + + // Name returns the current name of the Device. + Name() (string, error) + + // Events returns a channel of type Event, which is fed Device events. + Events() <-chan Event + + // Close stops the Device and closes the Event channel. + Close() error + + // BatchSize returns the preferred/max number of packets that can be read or + // written in a single read/write call. BatchSize must not change over the + // lifetime of a Device. + BatchSize() int } diff --git a/tun/tun_darwin.go b/tun/tun_darwin.go index 35d3085..c9a6c0b 100644 --- a/tun/tun_darwin.go +++ b/tun/tun_darwin.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -8,6 +8,7 @@ package tun import ( "errors" "fmt" + "io" "net" "os" "sync" @@ -15,7 +16,6 @@ import ( "time" "unsafe" - "golang.org/x/net/ipv6" "golang.org/x/sys/unix" ) @@ -33,7 +33,7 @@ type NativeTun struct { func retryInterfaceByIndex(index int) (iface *net.Interface, err error) { for i := 0; i < 20; i++ { iface, err = net.InterfaceByIndex(index) - if err != nil && errors.Is(err, syscall.ENOMEM) { + if err != nil && errors.Is(err, unix.ENOMEM) { time.Sleep(time.Duration(i) * time.Second / 3) continue } @@ -55,7 +55,7 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) { retry: n, err := unix.Read(tun.routeSocket, data) if err != nil { - if errno, ok := err.(syscall.Errno); ok && errno == syscall.EINTR { + if errno, ok := err.(unix.Errno); ok && errno == unix.EINTR { goto retry } tun.errors <- err @@ -107,7 +107,7 @@ func CreateTUN(name string, mtu int) (Device, error) { } } - fd, err := unix.Socket(unix.AF_SYSTEM, unix.SOCK_DGRAM, 2) + fd, err := socketCloexec(unix.AF_SYSTEM, unix.SOCK_DGRAM, 2) if err != nil { return nil, err } @@ -141,7 +141,7 @@ func CreateTUN(name string, mtu int) (Device, error) { if err == nil && name == "utun" { fname := os.Getenv("WG_TUN_NAME_FILE") if fname != "" { - os.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0400) + os.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0o400) } } @@ -173,7 +173,7 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { return nil, err } - tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC) + tun.routeSocket, err = socketCloexec(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC) if err != nil { tun.tunFile.Close() return nil, err @@ -213,50 +213,50 @@ func (tun *NativeTun) File() *os.File { return tun.tunFile } -func (tun *NativeTun) Events() chan Event { +func (tun *NativeTun) Events() <-chan Event { return tun.events } -func (tun *NativeTun) Read(buff []byte, offset int) (int, error) { +func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) { + // TODO: the BSDs look very similar in Read() and Write(). They should be + // collapsed, with platform-specific files containing the varying parts of + // their implementations. select { case err := <-tun.errors: return 0, err default: - buff := buff[offset-4:] - n, err := tun.tunFile.Read(buff[:]) + buf := bufs[0][offset-4:] + n, err := tun.tunFile.Read(buf[:]) if n < 4 { return 0, err } - return n - 4, err + sizes[0] = n - 4 + return 1, err } } -func (tun *NativeTun) Write(buff []byte, offset int) (int, error) { - - // reserve space for header - - buff = buff[offset-4:] - - // add packet information header - - buff[0] = 0x00 - buff[1] = 0x00 - buff[2] = 0x00 - - if buff[4]>>4 == ipv6.Version { - buff[3] = unix.AF_INET6 - } else { - buff[3] = unix.AF_INET +func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) { + if offset < 4 { + return 0, io.ErrShortBuffer } - - // write - - return tun.tunFile.Write(buff) -} - -func (tun *NativeTun) Flush() error { - // TODO: can flushing be implemented by buffering and using sendmmsg? - return nil + for i, buf := range bufs { + buf = buf[offset-4:] + buf[0] = 0x00 + buf[1] = 0x00 + buf[2] = 0x00 + switch buf[4] >> 4 { + case 4: + buf[3] = unix.AF_INET + case 6: + buf[3] = unix.AF_INET6 + default: + return i, unix.EAFNOSUPPORT + } + if _, err := tun.tunFile.Write(buf); err != nil { + return i, err + } + } + return len(bufs), nil } func (tun *NativeTun) Close() error { @@ -277,12 +277,11 @@ func (tun *NativeTun) Close() error { } func (tun *NativeTun) setMTU(n int) error { - fd, err := unix.Socket( + fd, err := socketCloexec( unix.AF_INET, unix.SOCK_DGRAM, 0, ) - if err != nil { return err } @@ -301,12 +300,11 @@ func (tun *NativeTun) setMTU(n int) error { } func (tun *NativeTun) MTU() (int, error) { - fd, err := unix.Socket( + fd, err := socketCloexec( unix.AF_INET, unix.SOCK_DGRAM, 0, ) - if err != nil { return 0, err } @@ -320,3 +318,19 @@ func (tun *NativeTun) MTU() (int, error) { return int(ifr.MTU), nil } + +func (tun *NativeTun) BatchSize() int { + return 1 +} + +func socketCloexec(family, sotype, proto int) (fd int, err error) { + // See go/src/net/sys_cloexec.go for background. + syscall.ForkLock.RLock() + defer syscall.ForkLock.RUnlock() + + fd, err = unix.Socket(family, sotype, proto) + if err == nil { + unix.CloseOnExec(fd) + } + return +} diff --git a/tun/tun_freebsd.go b/tun/tun_freebsd.go index dc9eb3e..7c65fd9 100644 --- a/tun/tun_freebsd.go +++ b/tun/tun_freebsd.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -143,7 +143,7 @@ func tunName(fd uintptr) (string, error) { // Destroy a named system interface func tunDestroy(name string) error { - fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0) + fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0) if err != nil { return err } @@ -170,7 +170,7 @@ func CreateTUN(name string, mtu int) (Device, error) { return nil, fmt.Errorf("interface %s already exists", name) } - tunFile, err := os.OpenFile("/dev/tun", unix.O_RDWR, 0) + tunFile, err := os.OpenFile("/dev/tun", unix.O_RDWR|unix.O_CLOEXEC, 0) if err != nil { return nil, err } @@ -213,7 +213,7 @@ func CreateTUN(name string, mtu int) (Device, error) { // Disable link-local v6, not just because WireGuard doesn't do that anyway, but // also because there are serious races with attaching and detaching LLv6 addresses // in relation to interface lifetime within the FreeBSD kernel. - confd6, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0) + confd6, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0) if err != nil { tunFile.Close() tunDestroy(assignedName) @@ -238,7 +238,7 @@ func CreateTUN(name string, mtu int) (Device, error) { } if name != "" { - confd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0) + confd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0) if err != nil { tunFile.Close() tunDestroy(assignedName) @@ -295,7 +295,7 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { return nil, err } - tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC) + tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW|unix.SOCK_CLOEXEC, unix.AF_UNSPEC) if err != nil { tun.tunFile.Close() return nil, err @@ -329,49 +329,50 @@ func (tun *NativeTun) File() *os.File { return tun.tunFile } -func (tun *NativeTun) Events() chan Event { +func (tun *NativeTun) Events() <-chan Event { return tun.events } -func (tun *NativeTun) Read(buff []byte, offset int) (int, error) { +func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) { select { case err := <-tun.errors: return 0, err default: - buff := buff[offset-4:] - n, err := tun.tunFile.Read(buff[:]) + buf := bufs[0][offset-4:] + n, err := tun.tunFile.Read(buf[:]) if n < 4 { return 0, err } - return n - 4, err + sizes[0] = n - 4 + return 1, err } } -func (tun *NativeTun) Write(buf []byte, offset int) (int, error) { +func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) { if offset < 4 { return 0, io.ErrShortBuffer } - buf = buf[offset-4:] - if len(buf) < 5 { - return 0, io.ErrShortBuffer - } - buf[0] = 0x00 - buf[1] = 0x00 - buf[2] = 0x00 - switch buf[4] >> 4 { - case 4: - buf[3] = unix.AF_INET - case 6: - buf[3] = unix.AF_INET6 - default: - return 0, unix.EAFNOSUPPORT + for i, buf := range bufs { + buf = buf[offset-4:] + if len(buf) < 5 { + return i, io.ErrShortBuffer + } + buf[0] = 0x00 + buf[1] = 0x00 + buf[2] = 0x00 + switch buf[4] >> 4 { + case 4: + buf[3] = unix.AF_INET + case 6: + buf[3] = unix.AF_INET6 + default: + return i, unix.EAFNOSUPPORT + } + if _, err := tun.tunFile.Write(buf); err != nil { + return i, err + } } - return tun.tunFile.Write(buf) -} - -func (tun *NativeTun) Flush() error { - // TODO: can flushing be implemented by buffering and using sendmmsg? - return nil + return len(bufs), nil } func (tun *NativeTun) Close() error { @@ -397,7 +398,7 @@ func (tun *NativeTun) Close() error { } func (tun *NativeTun) setMTU(n int) error { - fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0) + fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0) if err != nil { return err } @@ -414,7 +415,7 @@ func (tun *NativeTun) setMTU(n int) error { } func (tun *NativeTun) MTU() (int, error) { - fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0) + fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0) if err != nil { return 0, err } @@ -428,3 +429,7 @@ func (tun *NativeTun) MTU() (int, error) { } return int(*(*int32)(unsafe.Pointer(&ifr.MTU))), nil } + +func (tun *NativeTun) BatchSize() int { + return 1 +} diff --git a/tun/tun_linux.go b/tun/tun_linux.go index 1cc84cb..bd69cb5 100644 --- a/tun/tun_linux.go +++ b/tun/tun_linux.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -9,7 +9,6 @@ package tun */ import ( - "bytes" "errors" "fmt" "os" @@ -18,9 +17,8 @@ import ( "time" "unsafe" - "golang.org/x/net/ipv6" "golang.org/x/sys/unix" - + "golang.zx2c4.com/wireguard/conn" "golang.zx2c4.com/wireguard/rwcancel" ) @@ -34,17 +32,27 @@ type NativeTun struct { index int32 // if index errors chan error // async error handling events chan Event // device related events - nopi bool // the device was passed IFF_NO_PI netlinkSock int netlinkCancel *rwcancel.RWCancel hackListenerClosed sync.Mutex statusListenersShutdown chan struct{} + batchSize int + vnetHdr bool + udpGSO bool closeOnce sync.Once nameOnce sync.Once // guards calling initNameCache, which sets following fields nameCache string // name of interface nameErr error + + readOpMu sync.Mutex // readOpMu guards readBuff + readBuff [virtioNetHdrLen + 65535]byte // if vnetHdr every read() is prefixed by virtioNetHdr + + writeOpMu sync.Mutex // writeOpMu guards toWrite, tcpGROTable + toWrite []int + tcpGROTable *tcpGROTable + udpGROTable *udpGROTable } func (tun *NativeTun) File() *os.File { @@ -100,7 +108,7 @@ func (tun *NativeTun) routineHackListener() { } func createNetlinkSocket() (int, error) { - sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW, unix.NETLINK_ROUTE) + sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW|unix.SOCK_CLOEXEC, unix.NETLINK_ROUTE) if err != nil { return -1, err } @@ -195,7 +203,7 @@ func (tun *NativeTun) routineNetlinkListener() { func getIFIndex(name string) (int32, error) { fd, err := unix.Socket( unix.AF_INET, - unix.SOCK_DGRAM, + unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0, ) if err != nil { @@ -229,10 +237,9 @@ func (tun *NativeTun) setMTU(n int) error { // open datagram socket fd, err := unix.Socket( unix.AF_INET, - unix.SOCK_DGRAM, + unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0, ) - if err != nil { return err } @@ -266,10 +273,9 @@ func (tun *NativeTun) MTU() (int, error) { // open datagram socket fd, err := unix.Socket( unix.AF_INET, - unix.SOCK_DGRAM, + unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0, ) - if err != nil { return 0, err } @@ -323,67 +329,153 @@ func (tun *NativeTun) nameSlow() (string, error) { if errno != 0 { return "", fmt.Errorf("failed to get name of TUN device: %w", errno) } - name := ifr[:] - if i := bytes.IndexByte(name, 0); i != -1 { - name = name[:i] - } - return string(name), nil + return unix.ByteSliceToString(ifr[:]), nil } -func (tun *NativeTun) Write(buf []byte, offset int) (int, error) { - if tun.nopi { - buf = buf[offset:] +func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) { + tun.writeOpMu.Lock() + defer func() { + tun.tcpGROTable.reset() + tun.udpGROTable.reset() + tun.writeOpMu.Unlock() + }() + var ( + errs error + total int + ) + tun.toWrite = tun.toWrite[:0] + if tun.vnetHdr { + err := handleGRO(bufs, offset, tun.tcpGROTable, tun.udpGROTable, tun.udpGSO, &tun.toWrite) + if err != nil { + return 0, err + } + offset -= virtioNetHdrLen } else { - // reserve space for header - buf = buf[offset-4:] - - // add packet information header - buf[0] = 0x00 - buf[1] = 0x00 - if buf[4]>>4 == ipv6.Version { - buf[2] = 0x86 - buf[3] = 0xdd + for i := range bufs { + tun.toWrite = append(tun.toWrite, i) + } + } + for _, bufsI := range tun.toWrite { + n, err := tun.tunFile.Write(bufs[bufsI][offset:]) + if errors.Is(err, syscall.EBADFD) { + return total, os.ErrClosed + } + if err != nil { + errs = errors.Join(errs, err) } else { - buf[2] = 0x08 - buf[3] = 0x00 + total += n } } + return total, errs +} - n, err := tun.tunFile.Write(buf) - if errors.Is(err, syscall.EBADFD) { - err = os.ErrClosed +// handleVirtioRead splits in into bufs, leaving offset bytes at the front of +// each buffer. It mutates sizes to reflect the size of each element of bufs, +// and returns the number of packets read. +func handleVirtioRead(in []byte, bufs [][]byte, sizes []int, offset int) (int, error) { + var hdr virtioNetHdr + err := hdr.decode(in) + if err != nil { + return 0, err + } + in = in[virtioNetHdrLen:] + if hdr.gsoType == unix.VIRTIO_NET_HDR_GSO_NONE { + if hdr.flags&unix.VIRTIO_NET_HDR_F_NEEDS_CSUM != 0 { + // This means CHECKSUM_PARTIAL in skb context. We are responsible + // for computing the checksum starting at hdr.csumStart and placing + // at hdr.csumOffset. + err = gsoNoneChecksum(in, hdr.csumStart, hdr.csumOffset) + if err != nil { + return 0, err + } + } + if len(in) > len(bufs[0][offset:]) { + return 0, fmt.Errorf("read len %d overflows bufs element len %d", len(in), len(bufs[0][offset:])) + } + n := copy(bufs[0][offset:], in) + sizes[0] = n + return 1, nil + } + if hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_TCPV4 && hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_TCPV6 && hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_UDP_L4 { + return 0, fmt.Errorf("unsupported virtio GSO type: %d", hdr.gsoType) } - return n, err -} -func (tun *NativeTun) Flush() error { - // TODO: can flushing be implemented by buffering and using sendmmsg? - return nil + ipVersion := in[0] >> 4 + switch ipVersion { + case 4: + if hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_TCPV4 && hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_UDP_L4 { + return 0, fmt.Errorf("ip header version: %d, GSO type: %d", ipVersion, hdr.gsoType) + } + case 6: + if hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_TCPV6 && hdr.gsoType != unix.VIRTIO_NET_HDR_GSO_UDP_L4 { + return 0, fmt.Errorf("ip header version: %d, GSO type: %d", ipVersion, hdr.gsoType) + } + default: + return 0, fmt.Errorf("invalid ip header version: %d", ipVersion) + } + + // Don't trust hdr.hdrLen from the kernel as it can be equal to the length + // of the entire first packet when the kernel is handling it as part of a + // FORWARD path. Instead, parse the transport header length and add it onto + // csumStart, which is synonymous for IP header length. + if hdr.gsoType == unix.VIRTIO_NET_HDR_GSO_UDP_L4 { + hdr.hdrLen = hdr.csumStart + 8 + } else { + if len(in) <= int(hdr.csumStart+12) { + return 0, errors.New("packet is too short") + } + + tcpHLen := uint16(in[hdr.csumStart+12] >> 4 * 4) + if tcpHLen < 20 || tcpHLen > 60 { + // A TCP header must be between 20 and 60 bytes in length. + return 0, fmt.Errorf("tcp header len is invalid: %d", tcpHLen) + } + hdr.hdrLen = hdr.csumStart + tcpHLen + } + + if len(in) < int(hdr.hdrLen) { + return 0, fmt.Errorf("length of packet (%d) < virtioNetHdr.hdrLen (%d)", len(in), hdr.hdrLen) + } + + if hdr.hdrLen < hdr.csumStart { + return 0, fmt.Errorf("virtioNetHdr.hdrLen (%d) < virtioNetHdr.csumStart (%d)", hdr.hdrLen, hdr.csumStart) + } + cSumAt := int(hdr.csumStart + hdr.csumOffset) + if cSumAt+1 >= len(in) { + return 0, fmt.Errorf("end of checksum offset (%d) exceeds packet length (%d)", cSumAt+1, len(in)) + } + + return gsoSplit(in, hdr, bufs, sizes, offset, ipVersion == 6) } -func (tun *NativeTun) Read(buf []byte, offset int) (n int, err error) { +func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) { + tun.readOpMu.Lock() + defer tun.readOpMu.Unlock() select { - case err = <-tun.errors: + case err := <-tun.errors: + return 0, err default: - if tun.nopi { - n, err = tun.tunFile.Read(buf[offset:]) + readInto := bufs[0][offset:] + if tun.vnetHdr { + readInto = tun.readBuff[:] + } + n, err := tun.tunFile.Read(readInto) + if errors.Is(err, syscall.EBADFD) { + err = os.ErrClosed + } + if err != nil { + return 0, err + } + if tun.vnetHdr { + return handleVirtioRead(readInto[:n], bufs, sizes, offset) } else { - buff := buf[offset-4:] - n, err = tun.tunFile.Read(buff[:]) - if errors.Is(err, syscall.EBADFD) { - err = os.ErrClosed - } - if n < 4 { - n = 0 - } else { - n -= 4 - } + sizes[0] = n + return 1, nil } } - return } -func (tun *NativeTun) Events() chan Event { +func (tun *NativeTun) Events() <-chan Event { return tun.events } @@ -406,8 +498,58 @@ func (tun *NativeTun) Close() error { return err2 } +func (tun *NativeTun) BatchSize() int { + return tun.batchSize +} + +const ( + // TODO: support TSO with ECN bits + tunTCPOffloads = unix.TUN_F_CSUM | unix.TUN_F_TSO4 | unix.TUN_F_TSO6 + tunUDPOffloads = unix.TUN_F_USO4 | unix.TUN_F_USO6 +) + +func (tun *NativeTun) initFromFlags(name string) error { + sc, err := tun.tunFile.SyscallConn() + if err != nil { + return err + } + if e := sc.Control(func(fd uintptr) { + var ( + ifr *unix.Ifreq + ) + ifr, err = unix.NewIfreq(name) + if err != nil { + return + } + err = unix.IoctlIfreq(int(fd), unix.TUNGETIFF, ifr) + if err != nil { + return + } + got := ifr.Uint16() + if got&unix.IFF_VNET_HDR != 0 { + // tunTCPOffloads were added in Linux v2.6. We require their support + // if IFF_VNET_HDR is set. + err = unix.IoctlSetInt(int(fd), unix.TUNSETOFFLOAD, tunTCPOffloads) + if err != nil { + return + } + tun.vnetHdr = true + tun.batchSize = conn.IdealBatchSize + // tunUDPOffloads were added in Linux v6.2. We do not return an + // error if they are unsupported at runtime. + tun.udpGSO = unix.IoctlSetInt(int(fd), unix.TUNSETOFFLOAD, tunTCPOffloads|tunUDPOffloads) == nil + } else { + tun.batchSize = 1 + } + }); e != nil { + return e + } + return err +} + +// CreateTUN creates a Device with the provided name and MTU. func CreateTUN(name string, mtu int) (Device, error) { - nfd, err := unix.Open(cloneDevicePath, os.O_RDWR, 0) + nfd, err := unix.Open(cloneDevicePath, unix.O_RDWR|unix.O_CLOEXEC, 0) if err != nil { if os.IsNotExist(err) { return nil, fmt.Errorf("CreateTUN(%q) failed; %s does not exist", name, cloneDevicePath) @@ -415,25 +557,16 @@ func CreateTUN(name string, mtu int) (Device, error) { return nil, err } - var ifr [ifReqSize]byte - var flags uint16 = unix.IFF_TUN // | unix.IFF_NO_PI (disabled for TUN status hack) - nameBytes := []byte(name) - if len(nameBytes) >= unix.IFNAMSIZ { - unix.Close(nfd) - return nil, fmt.Errorf("interface name too long: %w", unix.ENAMETOOLONG) + ifr, err := unix.NewIfreq(name) + if err != nil { + return nil, err } - copy(ifr[:], nameBytes) - *(*uint16)(unsafe.Pointer(&ifr[unix.IFNAMSIZ])) = flags - - _, _, errno := unix.Syscall( - unix.SYS_IOCTL, - uintptr(nfd), - uintptr(unix.TUNSETIFF), - uintptr(unsafe.Pointer(&ifr[0])), - ) - if errno != 0 { - unix.Close(nfd) - return nil, errno + // IFF_VNET_HDR enables the "tun status hack" via routineHackListener() + // where a null write will return EINVAL indicating the TUN is up. + ifr.SetUint16(unix.IFF_TUN | unix.IFF_NO_PI | unix.IFF_VNET_HDR) + err = unix.IoctlIfreq(nfd, unix.TUNSETIFF, ifr) + if err != nil { + return nil, err } err = unix.SetNonblock(nfd, true) @@ -448,13 +581,16 @@ func CreateTUN(name string, mtu int) (Device, error) { return CreateTUNFromFile(fd, mtu) } +// CreateTUNFromFile creates a Device from an os.File with the provided MTU. func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { tun := &NativeTun{ tunFile: file, events: make(chan Event, 5), errors: make(chan error, 5), statusListenersShutdown: make(chan struct{}), - nopi: false, + tcpGROTable: newTCPGROTable(), + udpGROTable: newUDPGROTable(), + toWrite: make([]int, 0, conn.IdealBatchSize), } name, err := tun.Name() @@ -462,8 +598,12 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { return nil, err } - // start event listener + err = tun.initFromFlags(name) + if err != nil { + return nil, err + } + // start event listener tun.index, err = getIFIndex(name) if err != nil { return nil, err @@ -492,6 +632,8 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { return tun, nil } +// CreateUnmonitoredTUNFromFD creates a Device from the provided file +// descriptor. func CreateUnmonitoredTUNFromFD(fd int) (Device, string, error) { err := unix.SetNonblock(fd, true) if err != nil { @@ -499,14 +641,20 @@ func CreateUnmonitoredTUNFromFD(fd int) (Device, string, error) { } file := os.NewFile(uintptr(fd), "/dev/tun") tun := &NativeTun{ - tunFile: file, - events: make(chan Event, 5), - errors: make(chan error, 5), - nopi: true, + tunFile: file, + events: make(chan Event, 5), + errors: make(chan error, 5), + tcpGROTable: newTCPGROTable(), + udpGROTable: newUDPGROTable(), + toWrite: make([]int, 0, conn.IdealBatchSize), } name, err := tun.Name() if err != nil { return nil, "", err } - return tun, name, nil + err = tun.initFromFlags(name) + if err != nil { + return nil, "", err + } + return tun, name, err } diff --git a/tun/tun_openbsd.go b/tun/tun_openbsd.go index 7ef62f4..ae571b9 100644 --- a/tun/tun_openbsd.go +++ b/tun/tun_openbsd.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -8,13 +8,13 @@ package tun import ( "errors" "fmt" + "io" "net" "os" "sync" "syscall" "unsafe" - "golang.org/x/net/ipv6" "golang.org/x/sys/unix" ) @@ -114,10 +114,10 @@ func CreateTUN(name string, mtu int) (Device, error) { var err error if ifIndex != -1 { - tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0) + tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR|unix.O_CLOEXEC, 0) } else { for ifIndex = 0; ifIndex < 256; ifIndex++ { - tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0) + tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR|unix.O_CLOEXEC, 0) if err == nil || !errors.Is(err, syscall.EBUSY) { break } @@ -133,7 +133,7 @@ func CreateTUN(name string, mtu int) (Device, error) { if err == nil && name == "tun" { fname := os.Getenv("WG_TUN_NAME_FILE") if fname != "" { - os.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0400) + os.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0o400) } } @@ -165,7 +165,7 @@ func CreateTUNFromFile(file *os.File, mtu int) (Device, error) { return nil, err } - tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC) + tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW|unix.SOCK_CLOEXEC, unix.AF_UNSPEC) if err != nil { tun.tunFile.Close() return nil, err @@ -200,50 +200,47 @@ func (tun *NativeTun) File() *os.File { return tun.tunFile } -func (tun *NativeTun) Events() chan Event { +func (tun *NativeTun) Events() <-chan Event { return tun.events } -func (tun *NativeTun) Read(buff []byte, offset int) (int, error) { +func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) { select { case err := <-tun.errors: return 0, err default: - buff := buff[offset-4:] - n, err := tun.tunFile.Read(buff[:]) + buf := bufs[0][offset-4:] + n, err := tun.tunFile.Read(buf[:]) if n < 4 { return 0, err } - return n - 4, err + sizes[0] = n - 4 + return 1, err } } -func (tun *NativeTun) Write(buff []byte, offset int) (int, error) { - - // reserve space for header - - buff = buff[offset-4:] - - // add packet information header - - buff[0] = 0x00 - buff[1] = 0x00 - buff[2] = 0x00 - - if buff[4]>>4 == ipv6.Version { - buff[3] = unix.AF_INET6 - } else { - buff[3] = unix.AF_INET +func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) { + if offset < 4 { + return 0, io.ErrShortBuffer } - - // write - - return tun.tunFile.Write(buff) -} - -func (tun *NativeTun) Flush() error { - // TODO: can flushing be implemented by buffering and using sendmmsg? - return nil + for i, buf := range bufs { + buf = buf[offset-4:] + buf[0] = 0x00 + buf[1] = 0x00 + buf[2] = 0x00 + switch buf[4] >> 4 { + case 4: + buf[3] = unix.AF_INET + case 6: + buf[3] = unix.AF_INET6 + default: + return i, unix.EAFNOSUPPORT + } + if _, err := tun.tunFile.Write(buf); err != nil { + return i, err + } + } + return len(bufs), nil } func (tun *NativeTun) Close() error { @@ -271,10 +268,9 @@ func (tun *NativeTun) setMTU(n int) error { fd, err := unix.Socket( unix.AF_INET, - unix.SOCK_DGRAM, + unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0, ) - if err != nil { return err } @@ -306,10 +302,9 @@ func (tun *NativeTun) MTU() (int, error) { fd, err := unix.Socket( unix.AF_INET, - unix.SOCK_DGRAM, + unix.SOCK_DGRAM|unix.SOCK_CLOEXEC, 0, ) - if err != nil { return 0, err } @@ -332,3 +327,7 @@ func (tun *NativeTun) MTU() (int, error) { return int(*(*int32)(unsafe.Pointer(&ifr.MTU))), nil } + +func (tun *NativeTun) BatchSize() int { + return 1 +} diff --git a/tun/tun_windows.go b/tun/tun_windows.go index 3101ed9..2af8e3e 100644 --- a/tun/tun_windows.go +++ b/tun/tun_windows.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tun @@ -15,7 +15,6 @@ import ( _ "unsafe" "golang.org/x/sys/windows" - "golang.zx2c4.com/wintun" ) @@ -26,10 +25,10 @@ const ( ) type rateJuggler struct { - current uint64 - nextByteCount uint64 - nextStartTime int64 - changing int32 + current atomic.Uint64 + nextByteCount atomic.Uint64 + nextStartTime atomic.Int64 + changing atomic.Bool } type NativeTun struct { @@ -42,12 +41,15 @@ type NativeTun struct { events chan Event running sync.WaitGroup closeOnce sync.Once - close int32 + close atomic.Bool forcedMTU int + outSizes []int } -var WintunTunnelType = "WireGuard" -var WintunStaticRequestedGUID *windows.GUID +var ( + WintunTunnelType = "WireGuard" + WintunStaticRequestedGUID *windows.GUID +) //go:linkname procyield runtime.procyield func procyield(cycles uint32) @@ -55,18 +57,14 @@ func procyield(cycles uint32) //go:linkname nanotime runtime.nanotime func nanotime() int64 -// // CreateTUN creates a Wintun interface with the given name. Should a Wintun // interface with the same name exist, it is reused. -// func CreateTUN(ifname string, mtu int) (Device, error) { return CreateTUNWithRequestedGUID(ifname, WintunStaticRequestedGUID, mtu) } -// // CreateTUNWithRequestedGUID creates a Wintun interface with the given name and // a requested GUID. Should a Wintun interface with the same name exist, it is reused. -// func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID, mtu int) (Device, error) { wt, err := wintun.CreateAdapter(ifname, WintunTunnelType, requestedGUID) if err != nil { @@ -104,14 +102,14 @@ func (tun *NativeTun) File() *os.File { return nil } -func (tun *NativeTun) Events() chan Event { +func (tun *NativeTun) Events() <-chan Event { return tun.events } func (tun *NativeTun) Close() error { var err error tun.closeOnce.Do(func() { - atomic.StoreInt32(&tun.close, 1) + tun.close.Store(true) windows.SetEvent(tun.readWait) tun.running.Wait() tun.session.End() @@ -129,6 +127,9 @@ func (tun *NativeTun) MTU() (int, error) { // TODO: This is a temporary hack. We really need to be monitoring the interface in real time and adapting to MTU changes. func (tun *NativeTun) ForceMTU(mtu int) { + if tun.close.Load() { + return + } update := tun.forcedMTU != mtu tun.forcedMTU = mtu if update { @@ -136,29 +137,34 @@ func (tun *NativeTun) ForceMTU(mtu int) { } } +func (tun *NativeTun) BatchSize() int { + // TODO: implement batching with wintun + return 1 +} + // Note: Read() and Write() assume the caller comes only from a single thread; there's no locking. -func (tun *NativeTun) Read(buff []byte, offset int) (int, error) { +func (tun *NativeTun) Read(bufs [][]byte, sizes []int, offset int) (int, error) { tun.running.Add(1) defer tun.running.Done() retry: - if atomic.LoadInt32(&tun.close) == 1 { + if tun.close.Load() { return 0, os.ErrClosed } start := nanotime() - shouldSpin := atomic.LoadUint64(&tun.rate.current) >= spinloopRateThreshold && uint64(start-atomic.LoadInt64(&tun.rate.nextStartTime)) <= rateMeasurementGranularity*2 + shouldSpin := tun.rate.current.Load() >= spinloopRateThreshold && uint64(start-tun.rate.nextStartTime.Load()) <= rateMeasurementGranularity*2 for { - if atomic.LoadInt32(&tun.close) == 1 { + if tun.close.Load() { return 0, os.ErrClosed } packet, err := tun.session.ReceivePacket() switch err { case nil: - packetSize := len(packet) - copy(buff[offset:], packet) + n := copy(bufs[0][offset:], packet) + sizes[0] = n tun.session.ReleaseReceivePacket(packet) - tun.rate.update(uint64(packetSize)) - return packetSize, nil + tun.rate.update(uint64(n)) + return 1, nil case windows.ERROR_NO_MORE_ITEMS: if !shouldSpin || uint64(nanotime()-start) >= spinloopDuration { windows.WaitForSingleObject(tun.readWait, windows.INFINITE) @@ -175,40 +181,40 @@ retry: } } -func (tun *NativeTun) Flush() error { - return nil -} - -func (tun *NativeTun) Write(buff []byte, offset int) (int, error) { +func (tun *NativeTun) Write(bufs [][]byte, offset int) (int, error) { tun.running.Add(1) defer tun.running.Done() - if atomic.LoadInt32(&tun.close) == 1 { + if tun.close.Load() { return 0, os.ErrClosed } - packetSize := len(buff) - offset - tun.rate.update(uint64(packetSize)) + for i, buf := range bufs { + packetSize := len(buf) - offset + tun.rate.update(uint64(packetSize)) - packet, err := tun.session.AllocateSendPacket(packetSize) - if err == nil { - copy(packet, buff[offset:]) - tun.session.SendPacket(packet) - return packetSize, nil - } - switch err { - case windows.ERROR_HANDLE_EOF: - return 0, os.ErrClosed - case windows.ERROR_BUFFER_OVERFLOW: - return 0, nil // Dropping when ring is full. + packet, err := tun.session.AllocateSendPacket(packetSize) + switch err { + case nil: + // TODO: Explore options to eliminate this copy. + copy(packet, buf[offset:]) + tun.session.SendPacket(packet) + continue + case windows.ERROR_HANDLE_EOF: + return i, os.ErrClosed + case windows.ERROR_BUFFER_OVERFLOW: + continue // Dropping when ring is full. + default: + return i, fmt.Errorf("Write failed: %w", err) + } } - return 0, fmt.Errorf("Write failed: %w", err) + return len(bufs), nil } // LUID returns Windows interface instance ID. func (tun *NativeTun) LUID() uint64 { tun.running.Add(1) defer tun.running.Done() - if atomic.LoadInt32(&tun.close) == 1 { + if tun.close.Load() { return 0 } return tun.wt.LUID() @@ -221,15 +227,15 @@ func (tun *NativeTun) RunningVersion() (version uint32, err error) { func (rate *rateJuggler) update(packetLen uint64) { now := nanotime() - total := atomic.AddUint64(&rate.nextByteCount, packetLen) - period := uint64(now - atomic.LoadInt64(&rate.nextStartTime)) + total := rate.nextByteCount.Add(packetLen) + period := uint64(now - rate.nextStartTime.Load()) if period >= rateMeasurementGranularity { - if !atomic.CompareAndSwapInt32(&rate.changing, 0, 1) { + if !rate.changing.CompareAndSwap(false, true) { return } - atomic.StoreInt64(&rate.nextStartTime, now) - atomic.StoreUint64(&rate.current, total*uint64(time.Second/time.Nanosecond)/period) - atomic.StoreUint64(&rate.nextByteCount, 0) - atomic.StoreInt32(&rate.changing, 0) + rate.nextStartTime.Store(now) + rate.current.Store(total * uint64(time.Second/time.Nanosecond) / period) + rate.nextByteCount.Store(0) + rate.changing.Store(false) } } diff --git a/tun/tuntest/tuntest.go b/tun/tuntest/tuntest.go index bdf0467..d07e860 100644 --- a/tun/tuntest/tuntest.go +++ b/tun/tuntest/tuntest.go @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: MIT * - * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved. + * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved. */ package tuntest @@ -8,9 +8,9 @@ package tuntest import ( "encoding/binary" "io" + "net/netip" "os" - "golang.zx2c4.com/go118/netip" "golang.zx2c4.com/wireguard/tun" ) @@ -110,38 +110,45 @@ type chTun struct { func (t *chTun) File() *os.File { return nil } -func (t *chTun) Read(data []byte, offset int) (int, error) { +func (t *chTun) Read(packets [][]byte, sizes []int, offset int) (int, error) { select { case <-t.c.closed: return 0, os.ErrClosed case msg := <-t.c.Outbound: - return copy(data[offset:], msg), nil + n := copy(packets[0][offset:], msg) + sizes[0] = n + return 1, nil } } // Write is called by the wireguard device to deliver a packet for routing. -func (t *chTun) Write(data []byte, offset int) (int, error) { +func (t *chTun) Write(packets [][]byte, offset int) (int, error) { if offset == -1 { close(t.c.closed) close(t.c.events) return 0, io.EOF } - msg := make([]byte, len(data)-offset) - copy(msg, data[offset:]) - select { - case <-t.c.closed: - return 0, os.ErrClosed - case t.c.Inbound <- msg: - return len(data) - offset, nil + for i, data := range packets { + msg := make([]byte, len(data)-offset) + copy(msg, data[offset:]) + select { + case <-t.c.closed: + return i, os.ErrClosed + case t.c.Inbound <- msg: + } } + return len(packets), nil +} + +func (t *chTun) BatchSize() int { + return 1 } const DefaultMTU = 1420 -func (t *chTun) Flush() error { return nil } -func (t *chTun) MTU() (int, error) { return DefaultMTU, nil } -func (t *chTun) Name() (string, error) { return "loopbackTun1", nil } -func (t *chTun) Events() chan tun.Event { return t.c.events } +func (t *chTun) MTU() (int, error) { return DefaultMTU, nil } +func (t *chTun) Name() (string, error) { return "loopbackTun1", nil } +func (t *chTun) Events() <-chan tun.Event { return t.c.events } func (t *chTun) Close() error { t.Write(nil, -1) return nil @@ -1,3 +1,3 @@ package main -const Version = "0.0.20211016" +const Version = "0.0.20230223" |