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authorEric Dumazet <edumazet@google.com>2023-02-01 17:43:45 +0000
committerJakub Kicinski <kuba@kernel.org>2023-02-02 21:14:50 -0800
commit2798e36dc233a409a5d3f26f73029596dc504020 (patch)
tree059e250ccf09225bbeb55b0123071aba7caed1ee /net/ipv6/tcp_ipv6.c
parent0719bc3a5c77091192c57e440896a969cd1cf885 (diff)
tcp: add TCP_MINTTL drop reason
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>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 11b736a76bd7..543ee2167720 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1708,8 +1708,9 @@ process:
if (static_branch_unlikely(&ip6_min_hopcount)) {
/* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */
- if (hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) {
+ if (unlikely(hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount))) {
__NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
+ drop_reason = SKB_DROP_REASON_TCP_MINTTL;
goto discard_and_relse;
}
}