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BFD: Improve incoming packet matching

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For active sessions, ignore received packets with zero local id and
mismatched remote id. That forces a session timeout instead of an
immediate session restart. It makes BFD sessions more resilient to
packet spoofing.

Thanks to André Grüneberg for the suggestion.
This commit is contained in:
Ondrej Zajicek 2023-01-22 23:42:08 +01:00 committed by Igor Putovny
parent 084f5381f1
commit 248b505e1f
1 changed files with 4 additions and 0 deletions
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4
proto/bfd/packets.c
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@ -374,6 +374,10 @@ bfd_rx_hook(sock *sk, uint len)
/* FIXME: better session matching and message */
if (!s)
return 1;
/* For active sessions we require matching remote id */
if ((s->loc_state == BFD_STATE_UP) && (ntohl(pkt->snd_id) != s->rem_id))
DROP("mismatched remote id", ntohl(pkt->snd_id));
}
/* bfd_check_authentication() has its own error logging */