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tcp: add TCP_MINTTL drop reason

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In the unlikely case incoming packets are dropped because
of IP_MINTTL / IPV6_MINHOPCOUNT constraints...

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230201174345.2708943-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2023-02-01 17:43:45 +00:00
committed by Jakub Kicinski
parent 0719bc3a5c
commit 2798e36dc2
3 changed files with 9 additions and 1 deletions
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1
net/ipv4/tcp_ipv4.c
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@@ -2102,6 +2102,7 @@ process:
/* min_ttl can be changed concurrently from do_ip_setsockopt() */
if (unlikely(iph->ttl < READ_ONCE(inet_sk(sk)->min_ttl))) {
__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
drop_reason = SKB_DROP_REASON_TCP_MINTTL;
goto discard_and_relse;
}
}