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net/packet, wgengine, tstun: add inter-node TSMP protocol for connect errors

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This adds a new IP Protocol type, TSMP on protocol number 99 for
sending inter-tailscale messages over WireGuard, currently just for
why a peer rejects TCP SYNs (ACL rejection, shields up, and in the
future: nothing listening, something listening on that port but wrong
interface, etc)

Updates #1094
Updates tailscale/corp#1185

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-01-12 12:03:41 -08:00
committed by Brad Fitzpatrick
parent 01e8b7fb7e
commit b560386c1a
10 changed files with 362 additions and 41 deletions
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8
net/packet/packet.go
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@@ -204,6 +204,10 @@ func (q *Parsed) decode4(b []byte) {
q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
q.dataofs = q.subofs + udpHeaderLength
return
case TSMP:
// Inter-tailscale messages.
q.dataofs = q.subofs
return
default:
q.IPProto = Unknown
return
@@ -291,6 +295,10 @@ func (q *Parsed) decode6(b []byte) {
q.Src.Port = binary.BigEndian.Uint16(sub[0:2])
q.Dst.Port = binary.BigEndian.Uint16(sub[2:4])
q.dataofs = q.subofs + udpHeaderLength
case TSMP:
// Inter-tailscale messages.
q.dataofs = q.subofs
return
default:
q.IPProto = Unknown
return