[PATCH iproute2/net-next] tc: flower: Add support for ct_state reply flag

[Paul Blakey <paulb@nvidia.com>]

Matches on conntrack rpl ct_state.

Example:
$ tc filter add dev ens1f0_0 ingress prio 1 chain 1 proto ip flower \
  ct_state +trk+est+rpl \
  action mirred egress redirect dev ens1f0_1
$ tc filter add dev ens1f0_1 ingress prio 1 chain 1 proto ip flower \
  ct_state +trk+est-rpl \
  action mirred egress redirect dev ens1f0_0

Signed-off-by: Paul Blakey <paulb@nvidia.com>
---
 man/man8/tc-flower.8 | 2 ++
 tc/f_flower.c        | 1 +
 2 files changed, 3 insertions(+)

diff --git a/man/man8/tc-flower.8 b/man/man8/tc-flower.8
index 226d1cc..f7336b6 100644
--- a/man/man8/tc-flower.8
+++ b/man/man8/tc-flower.8
@@ -387,6 +387,8 @@ new - New connection.
 .TP
 est - Established connection.
 .TP
+rpl - The packet is in the reply direction, meaning that it is in the opposite direction from the packet that initiated the connection.
+.TP
 inv - The state is invalid. The packet couldn't be associated to a connection.
 .TP
 Example: +trk+est
diff --git a/tc/f_flower.c b/tc/f_flower.c
index 85c1043..53822a9 100644
--- a/tc/f_flower.c
+++ b/tc/f_flower.c
@@ -346,6 +346,7 @@ static struct flower_ct_states {
 	{ "new", TCA_FLOWER_KEY_CT_FLAGS_NEW },
 	{ "est", TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED },
 	{ "inv", TCA_FLOWER_KEY_CT_FLAGS_INVALID },
+	{ "rpl", TCA_FLOWER_KEY_CT_FLAGS_REPLY },
 };
 
 static int flower_parse_ct_state(char *str, struct nlmsghdr *n)
-- 
1.8.3.1