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net/portmapper: handle pcp ADDRESS_MISMATCH response

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These show up a fair amount in our logs.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
This commit is contained in:
Josh Bleecher Snyder
2021-11-23 13:49:47 -08:00
committed by Josh Bleecher Snyder
parent bb91cfeae7
commit 999814e9e1
2 changed files with 10 additions and 0 deletions
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6
net/portmapper/pcp.go
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@@ -28,6 +28,12 @@ const (
pcpCodeOK = 0
pcpCodeNotAuthorized = 2
// From RFC 6887:
// ADDRESS_MISMATCH: The source IP address of the request packet does
// not match the contents of the PCP Client's IP Address field, due
// to an unexpected NAT on the path between the PCP client and the
// PCP-controlled NAT or firewall.
pcpCodeAddressMismatch = 12
pcpOpReply = 0x80 // OR'd into request's op code on response
pcpOpAnnounce = 0