-
Notifications
You must be signed in to change notification settings - Fork 1.5k
Expand file tree
/
Copy pathrouter.go
More file actions
131 lines (117 loc) · 3.85 KB
/
Copy pathrouter.go
File metadata and controls
131 lines (117 loc) · 3.85 KB
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
package vpn
import (
"net"
"net/netip"
"tailscale.com/wgengine/router"
)
func NewRouter(t *Tunnel) router.Router {
return &vpnRouter{tunnel: t}
}
type vpnRouter struct {
tunnel *Tunnel
}
func (*vpnRouter) Up() error {
// On macOS, the Desktop app will handle turning the VPN on and off.
// On Windows, this is a no-op.
return nil
}
func (v *vpnRouter) Set(cfg *router.Config) error {
if cfg == nil {
return nil
}
req := convertRouterConfig(*cfg)
return v.tunnel.ApplyNetworkSettings(v.tunnel.ctx, req)
}
func (*vpnRouter) Close() error {
// There's no cleanup that we need to initiate from within the tunnel.
return nil
}
func convertRouterConfig(cfg router.Config) *NetworkSettingsRequest {
v4LocalAddrs := make([]string, 0)
v4SubnetMasks := make([]string, 0)
v6LocalAddrs := make([]string, 0)
v6PrefixLengths := make([]uint32, 0)
for _, addrs := range cfg.LocalAddrs {
switch {
case addrs.Addr().Is4():
v4LocalAddrs = append(v4LocalAddrs, addrs.Addr().String())
v4SubnetMasks = append(v4SubnetMasks, prefixToSubnetMask(addrs))
case addrs.Addr().Is6():
v6LocalAddrs = append(v6LocalAddrs, addrs.Addr().String())
// #nosec G115 - Safe conversion as IPv6 prefix lengths are always within uint32 range (0-128)
v6PrefixLengths = append(v6PrefixLengths, uint32(addrs.Bits()))
default:
continue
}
}
v4Routes := make([]*NetworkSettingsRequest_IPv4Settings_IPv4Route, 0)
v6Routes := make([]*NetworkSettingsRequest_IPv6Settings_IPv6Route, 0)
for _, route := range cfg.Routes {
switch {
case route.Addr().Is4():
v4Routes = append(v4Routes, convertToIPV4Route(route))
case route.Addr().Is6():
v6Routes = append(v6Routes, convertToIPV6Route(route))
default:
continue
}
}
v4ExcludedRoutes := make([]*NetworkSettingsRequest_IPv4Settings_IPv4Route, 0)
v6ExcludedRoutes := make([]*NetworkSettingsRequest_IPv6Settings_IPv6Route, 0)
for _, route := range cfg.LocalRoutes {
switch {
case route.Addr().Is4():
v4ExcludedRoutes = append(v4ExcludedRoutes, convertToIPV4Route(route))
case route.Addr().Is6():
v6ExcludedRoutes = append(v6ExcludedRoutes, convertToIPV6Route(route))
default:
continue
}
}
var v4Settings *NetworkSettingsRequest_IPv4Settings
if len(v4LocalAddrs) > 0 || len(v4Routes) > 0 || len(v4ExcludedRoutes) > 0 {
v4Settings = &NetworkSettingsRequest_IPv4Settings{
Addrs: v4LocalAddrs,
SubnetMasks: v4SubnetMasks,
IncludedRoutes: v4Routes,
ExcludedRoutes: v4ExcludedRoutes,
Router: "", // NA
}
}
var v6Settings *NetworkSettingsRequest_IPv6Settings
if len(v6LocalAddrs) > 0 || len(v6Routes) > 0 || len(v6ExcludedRoutes) > 0 {
v6Settings = &NetworkSettingsRequest_IPv6Settings{
Addrs: v6LocalAddrs,
PrefixLengths: v6PrefixLengths,
IncludedRoutes: v6Routes,
ExcludedRoutes: v6ExcludedRoutes,
}
}
return &NetworkSettingsRequest{
// #nosec G115 - Safe conversion as MTU values are expected to be small positive integers
Mtu: uint32(cfg.NewMTU),
Ipv4Settings: v4Settings,
Ipv6Settings: v6Settings,
TunnelOverheadBytes: 0, // N/A
TunnelRemoteAddress: "", // N/A
}
}
func convertToIPV4Route(route netip.Prefix) *NetworkSettingsRequest_IPv4Settings_IPv4Route {
return &NetworkSettingsRequest_IPv4Settings_IPv4Route{
Destination: route.Addr().String(),
Mask: prefixToSubnetMask(route),
Router: "", // N/A
}
}
func convertToIPV6Route(route netip.Prefix) *NetworkSettingsRequest_IPv6Settings_IPv6Route {
return &NetworkSettingsRequest_IPv6Settings_IPv6Route{
Destination: route.Addr().String(),
// #nosec G115 - Safe conversion as prefix lengths are always within uint32 range (0-128)
PrefixLength: uint32(route.Bits()),
Router: "", // N/A
}
}
func prefixToSubnetMask(prefix netip.Prefix) string {
maskBytes := net.CIDRMask(prefix.Masked().Bits(), net.IPv4len*8)
return net.IP(maskBytes).String()
}