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tcp: drop SYN+FIN messages

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Denys Fedoryshchenko reported that SYN+FIN attacks were bringing his
linux machines to their limits.

Dont call conn_request() if the TCP flags includes SYN flag

Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-12-02 23:41:42 +00:00 committed by David S. Miller
parent 78a8a36fe0
commit fdf5af0daf
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp_input.c
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@ -5811,6 +5811,8 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
goto discard;
if (th->syn) {
if (th->fin)
goto discard;
if (icsk->icsk_af_ops->conn_request(sk, skb) < 0)
return 1;