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tcp: add LINUX_MIB_PAWS_OLD_ACK SNMP counter

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Prior patch in the series added TCP_RFC7323_PAWS_ACK drop reason.

This patch adds the corresponding SNMP counter, for folks
using nstat instead of tracing for TCP diagnostics.

nstat -az | grep PAWSOldAck

Suggested-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Tested-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250113135558.3180360-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-01-13 13:55:58 +00:00
committed by Jakub Kicinski
parent 124c4c32e9
commit d16b344790
4 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
net/ipv4/tcp_input.c
View File

@@ -5969,12 +5969,13 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
if (unlikely(th->syn))
goto syn_challenge;
/* Old ACK are common, do not change PAWSESTABREJECTED
/* Old ACK are common, increment PAWS_OLD_ACK
* and do not send a dupack.
*/
if (reason == SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK)
if (reason == SKB_DROP_REASON_TCP_RFC7323_PAWS_ACK) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_PAWS_OLD_ACK);
goto discard;
}
NET_INC_STATS(sock_net(sk), LINUX_MIB_PAWSESTABREJECTED);
if (!tcp_oow_rate_limited(sock_net(sk), skb,
LINUX_MIB_TCPACKSKIPPEDPAWS,