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tcp: consume incoming skb leading to a reset

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Whenever tcp_validate_incoming() handles a valid RST packet,
we should not pretend the packet was dropped.

Create a special section at the end of tcp_validate_incoming()
to handle this case.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2022-04-15 17:10:39 -07:00 committed by David S. Miller
parent 7925c2d930
commit d9d024f966
1 changed files with 16 additions and 12 deletions
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28
net/ipv4/tcp_input.c
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@ -5700,7 +5700,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
&tp->last_oow_ack_time))
tcp_send_dupack(sk, skb);
} else if (tcp_reset_check(sk, skb)) {
tcp_reset(sk, skb);
goto reset;
}
goto discard;
}
@ -5736,17 +5736,16 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
}
if (rst_seq_match)
tcp_reset(sk, skb);
else {
/* Disable TFO if RST is out-of-order
* and no data has been received
* for current active TFO socket
*/
if (tp->syn_fastopen && !tp->data_segs_in &&
sk->sk_state == TCP_ESTABLISHED)
tcp_fastopen_active_disable(sk);
tcp_send_challenge_ack(sk);
}
goto reset;
/* Disable TFO if RST is out-of-order
* and no data has been received
* for current active TFO socket
*/
if (tp->syn_fastopen && !tp->data_segs_in &&
sk->sk_state == TCP_ESTABLISHED)
tcp_fastopen_active_disable(sk);
tcp_send_challenge_ack(sk);
goto discard;
}
@ -5771,6 +5770,11 @@ syn_challenge:
discard:
tcp_drop(sk, skb);
return false;
reset:
tcp_reset(sk, skb);
__kfree_skb(skb);
return false;
}
/*