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wgengine/netstack: refactor address construction and conversion

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Updates #9252
Updates #9253

Signed-off-by: Andrea Barisani <andrea@inversepath.com>
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
Andrea Barisani 2023-09-07 11:41:56 +02:00 committed by James Tucker
parent b5b4298325
commit f50b2a87ec
1 changed files with 14 additions and 18 deletions
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32
wgengine/netstack/netstack.go
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@ -196,8 +196,14 @@ func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magi
ipstack.SetPromiscuousMode(nicID, true)
// Add IPv4 and IPv6 default routes, so all incoming packets from the Tailscale side
// are handled by the one fake NIC we use.
ipv4Subnet, _ := tcpip.NewSubnet(tcpip.AddrFromSlice(bytes.Repeat([]byte{0x00}, 4)), tcpip.MaskFromBytes(bytes.Repeat([]byte{0x00}, 4)))
ipv6Subnet, _ := tcpip.NewSubnet(tcpip.AddrFromSlice(bytes.Repeat([]byte{0x00}, 16)), tcpip.MaskFromBytes(bytes.Repeat([]byte{0x00}, 16)))
ipv4Subnet, err := tcpip.NewSubnet(tcpip.AddrFromSlice(make([]byte, 4)), tcpip.MaskFromBytes(make([]byte, 4)))
if err != nil {
return nil, fmt.Errorf("could not create IPv4 subnet: %v", err)
}
ipv6Subnet, err := tcpip.NewSubnet(tcpip.AddrFromSlice(make([]byte, 16)), tcpip.MaskFromBytes(make([]byte, 16)))
if err != nil {
return nil, fmt.Errorf("could not create IPv6 subnet: %v", err)
}
ipstack.SetRouteTable([]tcpip.Route{
{
Destination: ipv4Subnet,
@ -240,7 +246,7 @@ func (ns *Impl) Close() error {
func (ns *Impl) wrapProtoHandler(h func(stack.TransportEndpointID, stack.PacketBufferPtr) bool) func(stack.TransportEndpointID, stack.PacketBufferPtr) bool {
return func(tei stack.TransportEndpointID, pb stack.PacketBufferPtr) bool {
addr := tei.LocalAddress
ip, ok := netip.AddrFromSlice(net.IP(addr.AsSlice()))
ip, ok := netip.AddrFromSlice(addr.AsSlice())
if !ok {
ns.logf("netstack: could not parse local address for incoming connection")
return false
@ -808,9 +814,8 @@ func netaddrIPFromNetstackIP(s tcpip.Address) netip.Addr {
s := s.As4()
return netaddr.IPv4(s[0], s[1], s[2], s[3])
case 16:
var a [16]byte
copy(a[:], s.AsSlice())
return netip.AddrFrom16(a).Unmap()
s := s.As16()
return netip.AddrFrom16(s).Unmap()
}
return netip.Addr{}
}
@ -1231,17 +1236,8 @@ func stringifyTEI(tei stack.TransportEndpointID) string {
}
func ipPortOfNetstackAddr(a tcpip.Address, port uint16) (ipp netip.AddrPort, ok bool) {
var a16 [16]byte
copy(a16[:], a.AsSlice())
switch a.Len() {
case 4:
return netip.AddrPortFrom(
netip.AddrFrom4(*(*[4]byte)(a16[:4])).Unmap(),
port,
), true
case 16:
return netip.AddrPortFrom(netip.AddrFrom16(a16).Unmap(), port), true
default:
return ipp, false
if addr, ok := netip.AddrFromSlice(a.AsSlice()); ok {
return netip.AddrPortFrom(addr, port), true
}
return netip.AddrPort{}, false
}