netfilter: nf_conntrack: add support for "conntrack zones"

Normally, each connection needs a unique identity. Conntrack zones allow
to specify a numerical zone using the CT target, connections in different
zones can use the same identity.

Example:

iptables -t raw -A PREROUTING -i veth0 -j CT --zone 1
iptables -t raw -A OUTPUT -o veth1 -j CT --zone 1

Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/ip.h b/include/net/ip.h
index fb63371c07a8..7bc47873e3fc 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -352,8 +352,11 @@ enum ip_defrag_users {
         IP_DEFRAG_LOCAL_DELIVER,
         IP_DEFRAG_CALL_RA_CHAIN,
         IP_DEFRAG_CONNTRACK_IN,
+        __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHORT_MAX,
         IP_DEFRAG_CONNTRACK_OUT,
+        __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHORT_MAX,
         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
+        __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHORT_MAX,
         IP_DEFRAG_VS_IN,
         IP_DEFRAG_VS_OUT,
         IP_DEFRAG_VS_FWD