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tcp: increase LINUX_MIB_BEYOND_WINDOW for SKB_DROP_REASON_TCP_OVERWINDOW

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Since commit 9ca48d616e ("tcp: do not accept packets beyond
window"), the path leading to SKB_DROP_REASON_TCP_OVERWINDOW in
tcp_data_queue() is probably dead. However, it can be reached now when
tcp_max_receive_window() is larger than tcp_receive_window(). In that
case, increment LINUX_MIB_BEYOND_WINDOW as done in tcp_sequence().

Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-3-4c7f96b1ec69@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Simon Baatz 2026-03-09 09:02:28 +01:00 committed by Jakub Kicinski
parent 81714374a2
commit e2b9c52a2b
1 changed files with 1 additions and 0 deletions
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1
net/ipv4/tcp_input.c
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@ -5678,6 +5678,7 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
if (!before(TCP_SKB_CB(skb)->seq,
tp->rcv_nxt + tcp_receive_window(tp))) {
reason = SKB_DROP_REASON_TCP_OVERWINDOW;
NET_INC_STATS(sock_net(sk), LINUX_MIB_BEYOND_WINDOW);
goto out_of_window;
}