[NETFILTER]: Add support for permanent expectations

A permanent expectation exists until timeing out and can expect
multiple related connections.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/netfilter_ipv4/ip_conntrack.h b/include/linux/netfilter_ipv4/ip_conntrack.h
index 088742befe49..7e033e9271a8 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack.h
@@ -263,6 +263,9 @@ struct ip_conntrack_expect
         /* Unique ID */
         unsigned int id;
 
+        /* Flags */
+        unsigned int flags;
+
 #ifdef CONFIG_IP_NF_NAT_NEEDED
         /* This is the original per-proto part, used to map the
          * expected connection the way the recipient expects. */
@@ -272,6 +275,8 @@ struct ip_conntrack_expect
 #endif
 };
 
+#define IP_CT_EXPECT_PERMANENT  0x1
+
 static inline struct ip_conntrack *
 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
 {