[NETFILTER]: TCP conntrack: accept RST|PSH as valid

This combination has been encountered on an IBM AS/400 in response
to packets sent to a closed session. There is no particular reason
to mark it invalid.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 9e49631..926e302 100644 (file)
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -774,6 +774,7 @@ static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] =
        [TH_SYN|TH_ACK]                 = 1,
        [TH_SYN|TH_ACK|TH_PUSH]         = 1,
        [TH_RST]                        = 1,
+       [TH_RST|TH_PUSH]                = 1,
        [TH_RST|TH_ACK]                 = 1,
        [TH_RST|TH_ACK|TH_PUSH]         = 1,
        [TH_FIN|TH_ACK]                 = 1,