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tcp: accept RST without ACK flag

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commit c3ae62af8e (tcp: should drop incoming frames without ACK flag
set) added a regression on the handling of RST messages.

RST should be allowed to come even without ACK bit set. We validate
the RST by checking the exact sequence, as requested by RFC 793 and
5961 3.2, in tcp_validate_incoming()

Reported-by: Eric Wong <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Neal Cardwell <[email protected]>
Tested-by: Eric Wong <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet authored and David S. Miller committed 2013-01-10 22:49:30 -08:00
1 parent cb59c87dbc
commit 7b514a886b
1 file changed
+2 -2
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net/ipv4/tcp_input.c
+2 -2
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@@ -5543,7 +5543,7 @@ slow_path:
if (len < (th->doff << 2) || tcp_checksum_complete_user(sk, skb))
goto csum_error;
if (!th->ack)
if (!th->ack && !th->rst)
goto discard;
/*
@@ -5988,7 +5988,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
goto discard;
}
if (!th->ack)
if (!th->ack && !th->rst)
goto discard;
if (!tcp_validate_incoming(sk, skb, th, 0))