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chore: add a tailscale router that uses the CoderVPN protocol#15391
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3 changes: 3 additions & 0 deletionstailnet/conn.go
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105 changes: 105 additions & 0 deletionsvpn/router.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| 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 { | ||
| 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 dylib. | ||
| return nil | ||
| } | ||
| func convertRouterConfig(cfg *router.Config) *NetworkSettingsRequest { | ||
| v4LocalAddrs := make([]string, 0) | ||
| v6LocalAddrs := make([]string, 0) | ||
| for _, addrs := range cfg.LocalAddrs { | ||
| if addrs.Addr().Is4() { | ||
| v4LocalAddrs = append(v4LocalAddrs, addrs.String()) | ||
| } else if addrs.Addr().Is6() { | ||
| v6LocalAddrs = append(v6LocalAddrs, addrs.String()) | ||
| } else { | ||
| continue | ||
| } | ||
| } | ||
| v4Routes := make([]*NetworkSettingsRequest_IPv4Settings_IPv4Route, 0) | ||
| v6Routes := make([]*NetworkSettingsRequest_IPv6Settings_IPv6Route, 0) | ||
| for _, route := range cfg.Routes { | ||
| if route.Addr().Is4() { | ||
| v4Routes = append(v4Routes, convertToIPV4Route(route)) | ||
| } else if route.Addr().Is6() { | ||
| v6Routes = append(v6Routes, convertToIPV6Route(route)) | ||
| } else { | ||
| continue | ||
| } | ||
| } | ||
| v4ExcludedRoutes := make([]*NetworkSettingsRequest_IPv4Settings_IPv4Route, 0) | ||
| v6ExcludedRoutes := make([]*NetworkSettingsRequest_IPv6Settings_IPv6Route, 0) | ||
| for _, route := range cfg.LocalRoutes { | ||
| if route.Addr().Is4() { | ||
| v4ExcludedRoutes = append(v4ExcludedRoutes, convertToIPV4Route(route)) | ||
| } else if route.Addr().Is6() { | ||
| v6ExcludedRoutes = append(v6ExcludedRoutes, convertToIPV6Route(route)) | ||
| } else { | ||
| continue | ||
| } | ||
| } | ||
| return &NetworkSettingsRequest{ | ||
| Mtu: uint32(cfg.NewMTU), | ||
| Ipv4Settings: &NetworkSettingsRequest_IPv4Settings{ | ||
| Addrs: v4LocalAddrs, | ||
| IncludedRoutes: v4Routes, | ||
| ExcludedRoutes: v4ExcludedRoutes, | ||
| }, | ||
| Ipv6Settings: &NetworkSettingsRequest_IPv6Settings{ | ||
| Addrs: v6LocalAddrs, | ||
| IncludedRoutes: v6Routes, | ||
| ExcludedRoutes: v6ExcludedRoutes, | ||
| }, | ||
| 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(), | ||
| 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() | ||
| } |
74 changes: 74 additions & 0 deletionsvpn/router_internal_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package vpn | ||
| import ( | ||
| "net/netip" | ||
| "testing" | ||
| "github.com/stretchr/testify/require" | ||
| "tailscale.com/wgengine/router" | ||
| ) | ||
| func TestConvertRouterConfig(t *testing.T) { | ||
| t.Parallel() | ||
| tests := []struct { | ||
| name string | ||
| cfg *router.Config | ||
| expected *NetworkSettingsRequest | ||
| }{ | ||
| { | ||
| name: "IPv4 and IPv6 configuration", | ||
| cfg: &router.Config{ | ||
| LocalAddrs: []netip.Prefix{netip.MustParsePrefix("100.64.0.1/32"), netip.MustParsePrefix("fd7a:115c:a1e0::1/128")}, | ||
| Routes: []netip.Prefix{netip.MustParsePrefix("192.168.0.0/24"), netip.MustParsePrefix("fd00::/64")}, | ||
| LocalRoutes: []netip.Prefix{netip.MustParsePrefix("10.0.0.0/8"), netip.MustParsePrefix("2001:db8::/32")}, | ||
| NewMTU: 1500, | ||
| }, | ||
| expected: &NetworkSettingsRequest{ | ||
| Mtu: 1500, | ||
| Ipv4Settings: &NetworkSettingsRequest_IPv4Settings{ | ||
| Addrs: []string{"100.64.0.1/32"}, | ||
| IncludedRoutes: []*NetworkSettingsRequest_IPv4Settings_IPv4Route{ | ||
| {Destination: "192.168.0.0", Mask: "255.255.255.0", Router: ""}, | ||
| }, | ||
| ExcludedRoutes: []*NetworkSettingsRequest_IPv4Settings_IPv4Route{ | ||
| {Destination: "10.0.0.0", Mask: "255.0.0.0", Router: ""}, | ||
| }, | ||
| }, | ||
| Ipv6Settings: &NetworkSettingsRequest_IPv6Settings{ | ||
| Addrs: []string{"fd7a:115c:a1e0::1/128"}, | ||
| IncludedRoutes: []*NetworkSettingsRequest_IPv6Settings_IPv6Route{ | ||
| {Destination: "fd00::", PrefixLength: 64, Router: ""}, | ||
| }, | ||
| ExcludedRoutes: []*NetworkSettingsRequest_IPv6Settings_IPv6Route{ | ||
| {Destination: "2001:db8::", PrefixLength: 32, Router: ""}, | ||
| }, | ||
| }, | ||
| }, | ||
| }, | ||
| { | ||
| name: "Empty", | ||
| cfg: &router.Config{}, | ||
| expected: &NetworkSettingsRequest{ | ||
| Ipv4Settings: &NetworkSettingsRequest_IPv4Settings{ | ||
| Addrs: []string{}, | ||
| IncludedRoutes: []*NetworkSettingsRequest_IPv4Settings_IPv4Route{}, | ||
| ExcludedRoutes: []*NetworkSettingsRequest_IPv4Settings_IPv4Route{}, | ||
| }, | ||
| Ipv6Settings: &NetworkSettingsRequest_IPv6Settings{ | ||
| Addrs: []string{}, | ||
| IncludedRoutes: []*NetworkSettingsRequest_IPv6Settings_IPv6Route{}, | ||
| ExcludedRoutes: []*NetworkSettingsRequest_IPv6Settings_IPv6Route{}, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
| //nolint:paralleltest // outdated rule | ||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| t.Parallel() | ||
| result := convertRouterConfig(tt.cfg) | ||
| require.Equal(t, tt.expected, result) | ||
| }) | ||
| } | ||
| } |
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