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-rw-r--r--device/conn_linux.go766
1 files changed, 0 insertions, 766 deletions
diff --git a/device/conn_linux.go b/device/conn_linux.go
deleted file mode 100644
index e90b0e3..0000000
--- a/device/conn_linux.go
+++ /dev/null
@@ -1,766 +0,0 @@
-// +build !android
-
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2019 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
- * of the sticky-sockets.c example code:
- * https://git.zx2c4.com/wireguard-tools/tree/contrib/sticky-sockets/sticky-sockets.c
- *
- * Currently there is no way to achieve this within the net package:
- * See e.g. https://github.com/golang/go/issues/17930
- * So this code is remains platform dependent.
- */
-
-package device
-
-import (
- "errors"
- "net"
- "strconv"
- "sync"
- "syscall"
- "unsafe"
-
- "golang.org/x/sys/unix"
- "golang.zx2c4.com/wireguard/rwcancel"
-)
-
-const (
- FD_ERR = -1
-)
-
-type IPv4Source struct {
- src [4]byte
- ifindex int32
-}
-
-type IPv6Source struct {
- src [16]byte
- //ifindex belongs in dst.ZoneId
-}
-
-type NativeEndpoint struct {
- sync.Mutex
- dst [unsafe.Sizeof(unix.SockaddrInet6{})]byte
- src [unsafe.Sizeof(IPv6Source{})]byte
- isV6 bool
-}
-
-func (endpoint *NativeEndpoint) src4() *IPv4Source {
- return (*IPv4Source)(unsafe.Pointer(&endpoint.src[0]))
-}
-
-func (endpoint *NativeEndpoint) src6() *IPv6Source {
- return (*IPv6Source)(unsafe.Pointer(&endpoint.src[0]))
-}
-
-func (endpoint *NativeEndpoint) dst4() *unix.SockaddrInet4 {
- return (*unix.SockaddrInet4)(unsafe.Pointer(&endpoint.dst[0]))
-}
-
-func (endpoint *NativeEndpoint) dst6() *unix.SockaddrInet6 {
- return (*unix.SockaddrInet6)(unsafe.Pointer(&endpoint.dst[0]))
-}
-
-type nativeBind struct {
- sock4 int
- sock6 int
- netlinkSock int
- netlinkCancel *rwcancel.RWCancel
- lastMark uint32
-}
-
-var _ Endpoint = (*NativeEndpoint)(nil)
-var _ Bind = (*nativeBind)(nil)
-
-func CreateEndpoint(s string) (Endpoint, error) {
- var end NativeEndpoint
- addr, err := parseEndpoint(s)
- if err != nil {
- return nil, err
- }
-
- ipv4 := addr.IP.To4()
- if ipv4 != nil {
- dst := end.dst4()
- end.isV6 = false
- dst.Port = addr.Port
- copy(dst.Addr[:], ipv4)
- end.ClearSrc()
- return &end, nil
- }
-
- ipv6 := addr.IP.To16()
- if ipv6 != nil {
- zone, err := zoneToUint32(addr.Zone)
- if err != nil {
- return nil, err
- }
- dst := end.dst6()
- end.isV6 = true
- dst.Port = addr.Port
- dst.ZoneId = zone
- copy(dst.Addr[:], ipv6[:])
- end.ClearSrc()
- return &end, nil
- }
-
- return nil, errors.New("Invalid IP address")
-}
-
-func createNetlinkRouteSocket() (int, error) {
- sock, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW, unix.NETLINK_ROUTE)
- if err != nil {
- return -1, err
- }
- saddr := &unix.SockaddrNetlink{
- Family: unix.AF_NETLINK,
- Groups: unix.RTMGRP_IPV4_ROUTE,
- }
- err = unix.Bind(sock, saddr)
- if err != nil {
- unix.Close(sock)
- return -1, err
- }
- return sock, nil
-
-}
-
-func CreateBind(port uint16, device *Device) (*nativeBind, uint16, error) {
- var err error
- var bind nativeBind
- var newPort uint16
-
- bind.netlinkSock, err = createNetlinkRouteSocket()
- if err != nil {
- return nil, 0, err
- }
- bind.netlinkCancel, err = rwcancel.NewRWCancel(bind.netlinkSock)
- if err != nil {
- unix.Close(bind.netlinkSock)
- return nil, 0, err
- }
-
- go bind.routineRouteListener(device)
-
- // attempt ipv6 bind, update port if successful
-
- bind.sock6, newPort, err = create6(port)
- if err != nil {
- if err != syscall.EAFNOSUPPORT {
- bind.netlinkCancel.Cancel()
- return nil, 0, err
- }
- } else {
- port = newPort
- }
-
- // attempt ipv4 bind, update port if successful
-
- bind.sock4, newPort, err = create4(port)
- if err != nil {
- if err != syscall.EAFNOSUPPORT {
- bind.netlinkCancel.Cancel()
- unix.Close(bind.sock6)
- return nil, 0, err
- }
- } else {
- port = newPort
- }
-
- if bind.sock4 == FD_ERR && bind.sock6 == FD_ERR {
- return nil, 0, errors.New("ipv4 and ipv6 not supported")
- }
-
- return &bind, port, nil
-}
-
-func (bind *nativeBind) SetMark(value uint32) error {
- 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
- }
- }
-
- bind.lastMark = value
- return nil
-}
-
-func closeUnblock(fd int) error {
- // shutdown to unblock readers and writers
- unix.Shutdown(fd, unix.SHUT_RDWR)
- return unix.Close(fd)
-}
-
-func (bind *nativeBind) Close() error {
- var err1, err2, err3 error
- if bind.sock6 != -1 {
- err1 = closeUnblock(bind.sock6)
- }
- if bind.sock4 != -1 {
- err2 = closeUnblock(bind.sock4)
- }
- err3 = bind.netlinkCancel.Cancel()
-
- if err1 != nil {
- return err1
- }
- if err2 != nil {
- return err2
- }
- return err3
-}
-
-func (bind *nativeBind) ReceiveIPv6(buff []byte) (int, Endpoint, error) {
- var end NativeEndpoint
- if bind.sock6 == -1 {
- return 0, nil, syscall.EAFNOSUPPORT
- }
- n, err := receive6(
- bind.sock6,
- buff,
- &end,
- )
- return n, &end, err
-}
-
-func (bind *nativeBind) ReceiveIPv4(buff []byte) (int, Endpoint, error) {
- var end NativeEndpoint
- if bind.sock4 == -1 {
- return 0, nil, syscall.EAFNOSUPPORT
- }
- n, err := receive4(
- bind.sock4,
- buff,
- &end,
- )
- return n, &end, err
-}
-
-func (bind *nativeBind) Send(buff []byte, end Endpoint) error {
- nend := end.(*NativeEndpoint)
- if !nend.isV6 {
- if bind.sock4 == -1 {
- return syscall.EAFNOSUPPORT
- }
- return send4(bind.sock4, nend, buff)
- } else {
- if bind.sock6 == -1 {
- return syscall.EAFNOSUPPORT
- }
- return send6(bind.sock6, nend, buff)
- }
-}
-
-func (end *NativeEndpoint) SrcIP() net.IP {
- if !end.isV6 {
- return net.IPv4(
- end.src4().src[0],
- end.src4().src[1],
- end.src4().src[2],
- end.src4().src[3],
- )
- } else {
- return end.src6().src[:]
- }
-}
-
-func (end *NativeEndpoint) DstIP() net.IP {
- if !end.isV6 {
- return net.IPv4(
- end.dst4().Addr[0],
- end.dst4().Addr[1],
- end.dst4().Addr[2],
- end.dst4().Addr[3],
- )
- } else {
- return end.dst6().Addr[:]
- }
-}
-
-func (end *NativeEndpoint) 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 *NativeEndpoint) SrcToString() string {
- return end.SrcIP().String()
-}
-
-func (end *NativeEndpoint) DstToString() string {
- var udpAddr net.UDPAddr
- udpAddr.IP = end.DstIP()
- if !end.isV6 {
- udpAddr.Port = end.dst4().Port
- } else {
- udpAddr.Port = end.dst6().Port
- }
- return udpAddr.String()
-}
-
-func (end *NativeEndpoint) ClearDst() {
- for i := range end.dst {
- end.dst[i] = 0
- }
-}
-
-func (end *NativeEndpoint) 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 FD_ERR, 0, err
- }
-
- addr := unix.SockaddrInet4{
- Port: int(port),
- }
-
- // set sockopts and bind
-
- if err := func() error {
- if err := unix.SetsockoptInt(
- fd,
- unix.SOL_SOCKET,
- unix.SO_REUSEADDR,
- 1,
- ); err != nil {
- return err
- }
-
- 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 FD_ERR, 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 FD_ERR, 0, err
- }
-
- // set sockopts and bind
-
- addr := unix.SockaddrInet6{
- Port: int(port),
- }
-
- if err := func() error {
-
- if err := unix.SetsockoptInt(
- fd,
- unix.SOL_SOCKET,
- unix.SO_REUSEADDR,
- 1,
- ); err != nil {
- return err
- }
-
- 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 FD_ERR, 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 *NativeEndpoint, 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.Lock()
- _, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
- end.Unlock()
-
- if err == nil {
- return nil
- }
-
- // clear src and retry
-
- if err == unix.EINVAL {
- end.ClearSrc()
- cmsg.pktinfo = unix.Inet4Pktinfo{}
- end.Lock()
- _, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
- end.Unlock()
- }
-
- return err
-}
-
-func send6(sock int, end *NativeEndpoint, 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.Lock()
- _, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
- end.Unlock()
-
- if err == nil {
- return nil
- }
-
- // clear src and retry
-
- if err == unix.EINVAL {
- end.ClearSrc()
- cmsg.pktinfo = unix.Inet6Pktinfo{}
- end.Lock()
- _, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
- end.Unlock()
- }
-
- return err
-}
-
-func receive4(sock int, buff []byte, end *NativeEndpoint) (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 *NativeEndpoint) (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
-}
-
-func (bind *nativeBind) routineRouteListener(device *Device) {
- type peerEndpointPtr struct {
- peer *Peer
- endpoint *Endpoint
- }
- var reqPeer map[uint32]peerEndpointPtr
- var reqPeerLock sync.Mutex
-
- defer unix.Close(bind.netlinkSock)
-
- for msg := make([]byte, 1<<16); ; {
- var err error
- var msgn int
- for {
- msgn, _, _, _, err = unix.Recvmsg(bind.netlinkSock, msg[:], nil, 0)
- if err == nil || !rwcancel.RetryAfterError(err) {
- break
- }
- if !bind.netlinkCancel.ReadyRead() {
- return
- }
- }
- if err != nil {
- return
- }
-
- for remain := msg[:msgn]; len(remain) >= unix.SizeofNlMsghdr; {
-
- hdr := *(*unix.NlMsghdr)(unsafe.Pointer(&remain[0]))
-
- if uint(hdr.Len) > uint(len(remain)) {
- break
- }
-
- switch hdr.Type {
- case unix.RTM_NEWROUTE, unix.RTM_DELROUTE:
- if hdr.Seq <= MaxPeers && hdr.Seq > 0 {
- if uint(len(remain)) < uint(hdr.Len) {
- break
- }
- if hdr.Len > unix.SizeofNlMsghdr+unix.SizeofRtMsg {
- attr := remain[unix.SizeofNlMsghdr+unix.SizeofRtMsg:]
- for {
- if uint(len(attr)) < uint(unix.SizeofRtAttr) {
- break
- }
- attrhdr := *(*unix.RtAttr)(unsafe.Pointer(&attr[0]))
- if attrhdr.Len < unix.SizeofRtAttr || uint(len(attr)) < uint(attrhdr.Len) {
- break
- }
- if attrhdr.Type == unix.RTA_OIF && attrhdr.Len == unix.SizeofRtAttr+4 {
- ifidx := *(*uint32)(unsafe.Pointer(&attr[unix.SizeofRtAttr]))
- reqPeerLock.Lock()
- if reqPeer == nil {
- reqPeerLock.Unlock()
- break
- }
- pePtr, ok := reqPeer[hdr.Seq]
- reqPeerLock.Unlock()
- if !ok {
- break
- }
- pePtr.peer.Lock()
- if &pePtr.peer.endpoint != pePtr.endpoint {
- pePtr.peer.Unlock()
- break
- }
- if uint32(pePtr.peer.endpoint.(*NativeEndpoint).src4().ifindex) == ifidx {
- pePtr.peer.Unlock()
- break
- }
- pePtr.peer.endpoint.(*NativeEndpoint).ClearSrc()
- pePtr.peer.Unlock()
- }
- attr = attr[attrhdr.Len:]
- }
- }
- break
- }
- reqPeerLock.Lock()
- reqPeer = make(map[uint32]peerEndpointPtr)
- reqPeerLock.Unlock()
- go func() {
- device.peers.RLock()
- i := uint32(1)
- for _, peer := range device.peers.keyMap {
- peer.RLock()
- if peer.endpoint == nil || peer.endpoint.(*NativeEndpoint) == nil {
- peer.RUnlock()
- continue
- }
- if peer.endpoint.(*NativeEndpoint).isV6 || peer.endpoint.(*NativeEndpoint).src4().ifindex == 0 {
- peer.RUnlock()
- break
- }
- nlmsg := struct {
- hdr unix.NlMsghdr
- msg unix.RtMsg
- dsthdr unix.RtAttr
- dst [4]byte
- srchdr unix.RtAttr
- src [4]byte
- markhdr unix.RtAttr
- mark uint32
- }{
- unix.NlMsghdr{
- Type: uint16(unix.RTM_GETROUTE),
- Flags: unix.NLM_F_REQUEST,
- Seq: i,
- },
- unix.RtMsg{
- Family: unix.AF_INET,
- Dst_len: 32,
- Src_len: 32,
- },
- unix.RtAttr{
- Len: 8,
- Type: unix.RTA_DST,
- },
- peer.endpoint.(*NativeEndpoint).dst4().Addr,
- unix.RtAttr{
- Len: 8,
- Type: unix.RTA_SRC,
- },
- peer.endpoint.(*NativeEndpoint).src4().src,
- unix.RtAttr{
- Len: 8,
- Type: unix.RTA_MARK,
- },
- uint32(bind.lastMark),
- }
- nlmsg.hdr.Len = uint32(unsafe.Sizeof(nlmsg))
- reqPeerLock.Lock()
- reqPeer[i] = peerEndpointPtr{
- peer: peer,
- endpoint: &peer.endpoint,
- }
- reqPeerLock.Unlock()
- peer.RUnlock()
- i++
- _, err := bind.netlinkCancel.Write((*[unsafe.Sizeof(nlmsg)]byte)(unsafe.Pointer(&nlmsg))[:])
- if err != nil {
- break
- }
- }
- device.peers.RUnlock()
- }()
- }
- remain = remain[hdr.Len:]
- }
- }
-}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.