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tcp: Apply max RTO to non-TFO SYN+ACK.

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Since commit 54a378f434 ("tcp: add the ability to control
max RTO"), TFO SYN+ACK RTO is capped by the TFO full sk's
inet_csk(sk)->icsk_rto_max.

The value is inherited from the parent listener.

Let's apply the same cap to non-TFO SYN+ACK.

Note that req->rsk_listener is always non-NULL when we call
tcp_reqsk_timeout() in reqsk_timer_handler() or tcp_check_req().

It could be NULL for SYN cookie req, but we do not use
req->timeout then.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20251106003357.273403-6-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kuniyuki Iwashima
2025-11-06 00:32:44 +00:00
committed by Jakub Kicinski
parent 207ce0f6bc
commit 1e9d3005e0
1 changed files with 2 additions and 1 deletions
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3
include/net/tcp.h
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@@ -845,7 +845,8 @@ static inline unsigned long tcp_reqsk_timeout(struct request_sock *req)
{
u64 timeout = (u64)req->timeout << req->num_timeout;
return (unsigned long)min_t(u64, timeout, TCP_RTO_MAX);
return (unsigned long)min_t(u64, timeout,
tcp_rto_max(req->rsk_listener));
}
u32 tcp_delack_max(const struct sock *sk);