From: Simon Baatz Date: Mon, 9 Mar 2026 08:02:28 +0000 (+0100) Subject: tcp: increase LINUX_MIB_BEYOND_WINDOW for SKB_DROP_REASON_TCP_OVERWINDOW X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e2b9c52a2b00ca754def5597cbc07ad401457974;p=thirdparty%2Flinux.git tcp: increase LINUX_MIB_BEYOND_WINDOW for SKB_DROP_REASON_TCP_OVERWINDOW 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 Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-3-4c7f96b1ec69@gmail.com Signed-off-by: Jakub Kicinski --- diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 2e1b237608150..e6b2f4be7723d 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -5678,6 +5678,7 @@ drop: 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; }