From 03b293dcd23416a0c686e7d595f6f606d36b8e0c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 12 Nov 2021 14:52:39 +0800 Subject: [PATCH] tcp: adjust rto_base in retransmits_timed_out() mainline inclusion from mainline-v5.4-rc2 commit 3256a2d6ab1f71f9a1bd2d7f6f18eb8108c48d17 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4AFRJ?from=project-issue CVE: NA ------------------------------------------------------------ The cited commit exposed an old retransmits_timed_out() bug which assumed it could call tcp_model_timeout() with TCP_RTO_MIN as rto_base for all states. But flows in SYN_SENT or SYN_RECV state uses a different RTO base (1 sec instead of 200 ms, unless BPF choses another value) This caused a reduction of SYN retransmits from 6 to 4 with the default /proc/sys/net/ipv4/tcp_syn_retries value. Fixes: a41e8a88b06e ("tcp: better handle TCP_USER_TIMEOUT in SYN_SENT state") Signed-off-by: Eric Dumazet Cc: Yuchung Cheng Cc: Marek Majkowski Signed-off-by: David S. Miller Conflicts: net/ipv4/tcp_timer.c Signed-off-by: Jiazhenyuan #openEuler_contributor Signed-off-by: Laibin Qiu Reviewed-by: Wei Yongjun Signed-off-by: Yang Yingliang --- net/ipv4/tcp_timer.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index 02337d633beb..f4e2d01c058d 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -195,8 +195,13 @@ static bool retransmits_timed_out(struct sock *sk, return false; start_ts = tcp_sk(sk)->retrans_stamp; - if (likely(timeout == 0)) - timeout = tcp_model_timeout(sk, boundary, TCP_RTO_MIN); + if (likely(timeout == 0)) { + unsigned int rto_base = TCP_RTO_MIN; + + if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) + rto_base = tcp_timeout_init(sk); + timeout = tcp_model_timeout(sk, boundary, rto_base); + } return (tcp_time_stamp(tcp_sk(sk)) - start_ts) >= timeout; } -- GitLab