[LLT-6783] rotate wg nt listen port when handshake fails and perform wg traceroute#1590
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In a lengthy investigation on ocassional loss of connection we observed that for some reason sometimes the client enters the state where it is sending WireGuard packets towards the server, but they are not received by the server's kernel module. Likely being dropped somewhere by middle-hops. At the same time we observed that packets going to different server at the time of the issue - does actually reach them, and suspicion is that packets even to the same server, but coming from the different source port will reach the server as well. As it will look like "new" UDP flow to all the middle box'es, their conntrack's and so on. This commit adds an experimental functionality, which hooks onto WG-NT driver logs and whenever there are at least two server-side handshakes in a rather quick succession (10 seconds) it triggers client-side source port change. If such a change will recover the connectivity (expected timeout for connectivity recovery is roughly 20-30s) then it kind of confirms the suspicions about UDP packet flow getting corrupted somehwere down the middle (we have captures on the client-side showing, that packets are actually leaving the device).
Jauler
requested review from
a team,
LukasPukenis,
asledzinskiy,
jjanowsk,
mathiaspeters,
matislovas,
olekoliinyk and
tomaszklak
as code owners
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