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[NETFILTER]: tcp conntrack: accept SYN|URG as valid 

Some stacks apparently send packets with SYN|URG set. Linux accepts
these packets, so TCP conntrack should to.

Pointed out by Martijn Posthuma <posthuma@sangine.com>.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-03-04 15:57:46 -08:00 committed by David S. Miller
parent e281db5cdf
commit d3ab4298aa
2 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
net/ipv4/netfilter/ip_conntrack_proto_tcp.c
View File

@ -812,8 +812,10 @@ void ip_conntrack_tcp_update(struct sk_buff *skb,
static const u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] =
{
[TH_SYN] = 1,
[TH_SYN|TH_ACK] = 1,
[TH_SYN|TH_PUSH] = 1,
[TH_SYN|TH_URG] = 1,
[TH_SYN|TH_PUSH|TH_URG] = 1,
[TH_SYN|TH_ACK] = 1,
[TH_SYN|TH_ACK|TH_PUSH] = 1,
[TH_RST] = 1,
[TH_RST|TH_ACK] = 1,

4
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -769,8 +769,10 @@ EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update);
static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] =
{
[TH_SYN] = 1,
[TH_SYN|TH_ACK] = 1,
[TH_SYN|TH_PUSH] = 1,
[TH_SYN|TH_URG] = 1,
[TH_SYN|TH_PUSH|TH_URG] = 1,
[TH_SYN|TH_ACK] = 1,
[TH_SYN|TH_ACK|TH_PUSH] = 1,
[TH_RST] = 1,
[TH_RST|TH_ACK] = 1,