[PATCH RFC net-next v2 2/5] tcp: increase LINUX_MIB_BEYOND_WINDOW for SKB_DROP_REASON_TCP_OVERWINDOW
From: Simon Baatz via B4 Relay <devnull+gmbnomis.gmail.com@kernel.org>
Date: 2026-02-26 00:49:26
Also in:
b4-sent, linux-doc, linux-kselftest, lkml
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Simon Baatz <redacted>
Since commit 9ca48d616ed7 ("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 <redacted>
---
net/ipv4/tcp_input.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index af9dd51256b01fd31d9e390d69dcb1d1700daf1b..f0ee3a599755aff00a00236728b430c7883087ff 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c@@ -5739,6 +5739,7 @@ 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; }
--
2.53.0