1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package tunnel
import (
"fmt"
"log"
"time"
"golang.zx2c4.com/go118/netip"
"golang.org/x/sys/windows"
"golang.zx2c4.com/wireguard/windows/conf"
"golang.zx2c4.com/wireguard/windows/services"
"golang.zx2c4.com/wireguard/windows/tunnel/firewall"
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
)
func cleanupAddressesOnDisconnectedInterfaces(family winipcfg.AddressFamily, addresses []netip.Prefix) {
if len(addresses) == 0 {
return
}
addrHash := make(map[netip.Addr]bool, len(addresses))
for i := range addresses {
addrHash[addresses[i].Addr()] = true
}
interfaces, err := winipcfg.GetAdaptersAddresses(family, winipcfg.GAAFlagDefault)
if err != nil {
return
}
for _, iface := range interfaces {
if iface.OperStatus == winipcfg.IfOperStatusUp {
continue
}
for address := iface.FirstUnicastAddress; address != nil; address = address.Next {
if ip, _ := netip.AddrFromSlice(address.Address.IP()); addrHash[ip] {
prefix := netip.PrefixFrom(ip, int(address.OnLinkPrefixLength))
log.Printf("Cleaning up stale address %s from interface ‘%s’", prefix.String(), iface.FriendlyName())
iface.LUID.DeleteIPAddress(prefix)
}
}
}
}
func configureInterface(family winipcfg.AddressFamily, conf *conf.Config, luid winipcfg.LUID) error {
retryOnFailure := services.StartedAtBoot()
tryTimes := 0
startOver:
var err error
if tryTimes > 0 {
log.Printf("Retrying interface configuration after failure because system just booted (T+%v): %v", windows.DurationSinceBoot(), err)
time.Sleep(time.Second)
retryOnFailure = retryOnFailure && tryTimes < 15
}
tryTimes++
estimatedRouteCount := 0
for _, peer := range conf.Peers {
estimatedRouteCount += len(peer.AllowedIPs)
}
routes := make(map[winipcfg.RouteData]bool, estimatedRouteCount)
foundDefault4 := false
foundDefault6 := false
for _, peer := range conf.Peers {
for _, allowedip := range peer.AllowedIPs {
route := winipcfg.RouteData{
Destination: allowedip.Masked(),
Metric: 0,
}
if allowedip.Addr().Is4() {
if allowedip.Bits() == 0 {
foundDefault4 = true
}
route.NextHop = netip.IPv4Unspecified()
} else if allowedip.Addr().Is6() {
if allowedip.Bits() == 0 {
foundDefault6 = true
}
route.NextHop = netip.IPv6Unspecified()
}
routes[route] = true
}
}
deduplicatedRoutes := make([]*winipcfg.RouteData, 0, len(routes))
for route := range routes {
r := route
deduplicatedRoutes = append(deduplicatedRoutes, &r)
}
if !conf.Interface.TableOff {
err = luid.SetRoutesForFamily(family, deduplicatedRoutes)
if err == windows.ERROR_NOT_FOUND && retryOnFailure {
goto startOver
} else if err != nil {
return fmt.Errorf("unable to set routes: %w", err)
}
}
err = luid.SetIPAddressesForFamily(family, conf.Interface.Addresses)
if err == windows.ERROR_OBJECT_ALREADY_EXISTS {
cleanupAddressesOnDisconnectedInterfaces(family, conf.Interface.Addresses)
err = luid.SetIPAddressesForFamily(family, conf.Interface.Addresses)
}
if err == windows.ERROR_NOT_FOUND && retryOnFailure {
goto startOver
} else if err != nil {
return fmt.Errorf("unable to set ips: %w", err)
}
var ipif *winipcfg.MibIPInterfaceRow
ipif, err = luid.IPInterface(family)
if err != nil {
return err
}
ipif.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
ipif.DadTransmits = 0
ipif.ManagedAddressConfigurationSupported = false
ipif.OtherStatefulConfigurationSupported = false
if conf.Interface.MTU > 0 {
ipif.NLMTU = uint32(conf.Interface.MTU)
}
if (family == windows.AF_INET && foundDefault4) || (family == windows.AF_INET6 && foundDefault6) {
ipif.UseAutomaticMetric = false
ipif.Metric = 0
}
err = ipif.Set()
if err == windows.ERROR_NOT_FOUND && retryOnFailure {
goto startOver
} else if err != nil {
return fmt.Errorf("unable to set metric and MTU: %w", err)
}
err = luid.SetDNS(family, conf.Interface.DNS, conf.Interface.DNSSearch)
if err == windows.ERROR_NOT_FOUND && retryOnFailure {
goto startOver
} else if err != nil {
return fmt.Errorf("unable to set DNS: %w", err)
}
return nil
}
func enableFirewall(conf *conf.Config, luid winipcfg.LUID) error {
doNotRestrict := true
if len(conf.Peers) == 1 && !conf.Interface.TableOff {
for _, allowedip := range conf.Peers[0].AllowedIPs {
if allowedip.Bits() == 0 && allowedip == allowedip.Masked() {
doNotRestrict = false
break
}
}
}
log.Println("Enabling firewall rules")
return firewall.EnableFirewall(uint64(luid), doNotRestrict, conf.Interface.DNS)
}
|