On Mon, Mar 9, 2026 at 9:03 AM Simon Baatz via B4 Relay <[email protected]> wrote: > > From: Simon Baatz <[email protected]> > > 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 <[email protected]> > --- > 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 > 2e1b237608150c2e9c9baf73cf047ed0823ca555..e6b2f4be7723db14acf2ae528df17b6d106b9da9 > 100644 > --- a/net/ipv4/tcp_input.c > +++ b/net/ipv4/tcp_input.c > @@ -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; > }
Reviewed-by: Eric Dumazet <[email protected]>
