zebra: storage of gre information in zebra layer

zebra is able to get information about gre tunnels.
zebra_gre file is created to handle hooks, but is not yet used.
also, debug zebra gre command is done to add gre traces.
A zebra_gre file is used for complementary actions that may be needed.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/zebra/zebra_l2.c b/zebra/zebra_l2.c
index c3fbff272..71fac556e 100644
--- a/zebra/zebra_l2.c
+++ b/zebra/zebra_l2.c
@@ -290,6 +290,32 @@ void zebra_l2_vlanif_update(struct interface *ifp,
 }
 
 /*
+ * Update L2 info for a GRE interface. This is called upon interface
+ * addition as well as update. Upon add/update, need to inform
+ * clients about GRE information.
+ */
+void zebra_l2_greif_add_update(struct interface *ifp,
+			       struct zebra_l2info_gre *gre_info, int add)
+{
+	struct zebra_if *zif;
+	struct in_addr old_vtep_ip;
+
+	zif = ifp->info;
+	assert(zif);
+
+	if (add) {
+		memcpy(&zif->l2info.gre, gre_info, sizeof(*gre_info));
+		return;
+	}
+
+	old_vtep_ip = zif->l2info.gre.vtep_ip;
+	if (IPV4_ADDR_SAME(&old_vtep_ip, &gre_info->vtep_ip))
+		return;
+
+	zif->l2info.gre.vtep_ip = gre_info->vtep_ip;
+}
+
+/*
  * Update L2 info for a VxLAN interface. This is called upon interface
  * addition as well as update. Upon add, need to invoke the VNI create
  * function. Upon update, the params of interest are the local tunnel