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tcp: propagate tcp_tw_isn via an extra parameter to ->route_req()

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tcp_v6_init_req() reads TCP_SKB_CB(skb)->tcp_tw_isn to find
out if the request socket is created by a SYN hitting a TIMEWAIT socket.

This has been buggy for a decade, lets directly pass the information
from tcp_conn_request().

This is a preparatory patch to make the following one easier to review.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet
2024-04-07 09:33:21 +00:00
committed by Paolo Abeni
parent 1c25fe9a04
commit b9e8104058
5 changed files with 17 additions and 11 deletions
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2
net/ipv4/tcp_input.c
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@@ -7160,7 +7160,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
/* Note: tcp_v6_init_req() might override ir_iif for link locals */
inet_rsk(req)->ir_iif = inet_request_bound_dev_if(sk, skb);
dst = af_ops->route_req(sk, skb, &fl, req);
dst = af_ops->route_req(sk, skb, &fl, req, isn);
if (!dst)
goto drop_and_free;