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| author | Zhongqiu Duan <dzq.aishenghu0@gmail.com> | 2025-01-02 18:14:26 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-01-04 17:17:23 +0100 |
| commit | 3479c7549fb1dfa7a1db4efb7347c7b8ef50de4b (patch) | |
| tree | 5f268bc6a923286792ba785c3f4e151c76122fc9 /net/sched/cls_flow.c | |
| parent | net: 802: LLC+SNAP OID:PID lookup on start of skb data (diff) | |
| download | linux-3479c7549fb1dfa7a1db4efb7347c7b8ef50de4b.tar.xz linux-3479c7549fb1dfa7a1db4efb7347c7b8ef50de4b.zip | |
tcp/dccp: allow a connection when sk_max_ack_backlog is zero
If the backlog of listen() is set to zero, sk_acceptq_is_full() allows
one connection to be made, but inet_csk_reqsk_queue_is_full() does not.
When the net.ipv4.tcp_syncookies is zero, inet_csk_reqsk_queue_is_full()
will cause an immediate drop before the sk_acceptq_is_full() check in
tcp_conn_request(), resulting in no connection can be made.
This patch tries to keep consistent with 64a146513f8f ("[NET]: Revert
incorrect accept queue backlog changes.").
Link: https://lore.kernel.org/netdev/20250102080258.53858-1-kuniyu@amazon.com/
Fixes: ef547f2ac16b ("tcp: remove max_qlen_log")
Signed-off-by: Zhongqiu Duan <dzq.aishenghu0@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250102171426.915276-1-dzq.aishenghu0@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sched/cls_flow.c')
0 files changed, 0 insertions, 0 deletions