The nonce used in PCP identifies a particular port mapping. It needs
to be generated randomly for the initial mapping, and then saved so
that it can be used to renew or delete a mapping later. This is how
the router checks that we're authorized to change existing mappings.
If we receive a response for a different nonce, we should ignore it
since it's not meant for us (or the router is misbehaving).
Fixes#21127
Change-Id: Ic7874d376a74791807953f2f559c8a14a8eb75e9
Signed-off-by: Francois Marier <francois@tailscale.com>
François Marier
7f9de91e99