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net/portmapper: ignore IGD SSDP responses from !defaultgw

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Now that we multicast the SSDP query, we can get IGD offers from
devices other than the current device's default gateway. We don't want
to accidentally bind ourselves to those.

Updates #3197

Signed-off-by: David Anderson <danderson@tailscale.com>
(cherry picked from commit 060ba86baa4ac585246e7948f40a0dbd5924da9d)
This commit is contained in:
David Anderson 2021-10-27 15:25:22 -07:00 committed by Brad Fitzpatrick
parent d117f77094
commit 6f332b4cf1
1 changed files with 5 additions and 1 deletions
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6
net/portmapper/portmapper.go
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@ -752,10 +752,14 @@ func (c *Client) Probe(ctx context.Context) (res ProbeResult, err error) {
}
return res, err
}
ip, ok := netaddr.FromStdIP(addr.(*net.UDPAddr).IP)
if !ok {
continue
}
port := uint16(addr.(*net.UDPAddr).Port)
switch port {
case c.upnpPort():
if mem.Contains(mem.B(buf[:n]), mem.S(":InternetGatewayDevice:")) {
if ip == gw && mem.Contains(mem.B(buf[:n]), mem.S(":InternetGatewayDevice:")) {
meta, err := parseUPnPDiscoResponse(buf[:n])
if err != nil {
c.logf("unrecognized UPnP discovery response; ignoring")