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net/tcp: Add tcp-md5 and tcp-ao tracepoints

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Instead of forcing userspace to parse dmesg (that's what currently is
happening, at least in codebase of my current company), provide a better
way, that can be enabled/disabled in runtime.

Currently, there are already tcp events, add hashing related ones there,
too. Rasdaemon currently exercises net_dev_xmit_timeout,
devlink_health_report, but it'll be trivial to teach it to deal with
failed hashes. Otherwise, BGP may trace/log them itself. Especially
exciting for possible investigations is key rotation (RNext_key
requests).

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Safonov
2024-06-07 00:25:58 +01:00
committed by David S. Miller
parent 811efc06e5
commit 96be3dcd01
5 changed files with 355 additions and 2 deletions
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8
net/ipv4/tcp_input.c
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@@ -3578,8 +3578,10 @@ static void tcp_snd_sne_update(struct tcp_sock *tp, u32 ack)
ao = rcu_dereference_protected(tp->ao_info,
lockdep_sock_is_held((struct sock *)tp));
if (ao && ack < tp->snd_una)
if (ao && ack < tp->snd_una) {
ao->snd_sne++;
trace_tcp_ao_snd_sne_update((struct sock *)tp, ao->snd_sne);
}
#endif
}
@@ -3604,8 +3606,10 @@ static void tcp_rcv_sne_update(struct tcp_sock *tp, u32 seq)
ao = rcu_dereference_protected(tp->ao_info,
lockdep_sock_is_held((struct sock *)tp));
if (ao && seq < tp->rcv_nxt)
if (ao && seq < tp->rcv_nxt) {
ao->rcv_sne++;
trace_tcp_ao_rcv_sne_update((struct sock *)tp, ao->rcv_sne);
}
#endif
}