diff options
| -rw-r--r-- | net/netfilter/nf_conntrack_proto_tcp.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index 926e302494f3..a1363626bccc 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -764,27 +764,18 @@ EXPORT_SYMBOL_GPL(nf_conntrack_tcp_update); #define TH_ECE 0x40 #define TH_CWR 0x80 -/* table of valid flag combinations - ECE and CWR are always valid */ -static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG) + 1] = +/* table of valid flag combinations - PUSH, ECE and CWR are always valid */ +static u8 tcp_valid_flags[(TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG) + 1] = { [TH_SYN] = 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_PUSH] = 1, [TH_RST|TH_ACK] = 1, - [TH_RST|TH_ACK|TH_PUSH] = 1, [TH_FIN|TH_ACK] = 1, + [TH_FIN|TH_ACK|TH_URG] = 1, [TH_ACK] = 1, - [TH_ACK|TH_PUSH] = 1, [TH_ACK|TH_URG] = 1, - [TH_ACK|TH_URG|TH_PUSH] = 1, - [TH_FIN|TH_ACK|TH_PUSH] = 1, - [TH_FIN|TH_ACK|TH_URG] = 1, - [TH_FIN|TH_ACK|TH_URG|TH_PUSH] = 1, }; /* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */ @@ -831,7 +822,7 @@ static int tcp_error(struct sk_buff *skb, } /* Check TCP flags. */ - tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR)); + tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH)); if (!tcp_valid_flags[tcpflags]) { if (LOG_INVALID(IPPROTO_TCP)) nf_log_packet(pf, 0, skb, NULL, NULL, NULL, |
