@@ -201,6 +201,20 @@ static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmpv6;
}
+
+/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
+static inline void nf_ct_set_tcp_be_liberal(struct nf_conn *ct)
+{
+ ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
+ ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
+}
+
+/* Caller must check nf_ct_protonum(ct) is IPPROTO_TCP before calling. */
+static inline bool nf_conntrack_tcp_established(const struct nf_conn *ct)
+{
+ return ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED &&
+ test_bit(IPS_ASSURED_BIT, &ct->status);
+}
#endif
#ifdef CONFIG_NF_CT_PROTO_DCCP
@@ -834,12 +834,6 @@ static noinline bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
return true;
}
-static bool nf_conntrack_tcp_established(const struct nf_conn *ct)
-{
- return ct->proto.tcp.state == TCP_CONNTRACK_ESTABLISHED &&
- test_bit(IPS_ASSURED_BIT, &ct->status);
-}
-
/* Returns verdict for packet, or -1 for invalid. */
int nf_conntrack_tcp_packet(struct nf_conn *ct,
struct sk_buff *skb,
@@ -1034,6 +1034,14 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
return -EINVAL;
}
+
+ if (nf_ct_protonum(ct) == IPPROTO_TCP &&
+ nf_ct_is_confirmed(ct) && nf_conntrack_tcp_established(ct)) {
+ /* Be liberal for tcp packets so that out-of-window
+ * packets are not marked invalid.
+ */
+ nf_ct_set_tcp_be_liberal(ct);
+ }
}
return 0;