zebra: Keep DAD disabled if EVPN MH is turned on

DAD is not supported currently with EVPN-MH so we turn it off internally
when the first ES config is detected.

PS: Note that when all local ESs are deleted DAD will stay off and
will need to be cleared via a daemon restart.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/zebra/zebra_evpn_mh.h b/zebra/zebra_evpn_mh.h
index 09af26a3a..c232e3b8f 100644
--- a/zebra/zebra_evpn_mh.h
+++ b/zebra/zebra_evpn_mh.h
@@ -164,6 +164,12 @@ struct zebra_evpn_access_bd {
 /* multihoming information stored in zrouter */
 #define zmh_info (zrouter.mh_info)
 struct zebra_evpn_mh_info {
+	uint32_t flags;
+/* DAD support for EVPN-MH is yet to be added. So on detection of
+ * first local ES, DAD is turned off
+ */
+#define ZEBRA_EVPN_MH_DUP_ADDR_DETECT_OFF (1 << 1)
+
 	/* RB tree of Ethernet segments (used for EVPN-MH)  */
 	struct zebra_es_rb_head es_rb_tree;
 	/* List of local ESs */
@@ -228,6 +234,12 @@ static inline bool zebra_evpn_mh_is_fdb_nh(uint32_t id)
 			(id & EVPN_NH_ID_TYPE_BIT));
 }
 
+static inline bool zebra_evpn_mh_do_dup_addr_detect(void)
+{
+	return !(zmh_info->flags & ZEBRA_EVPN_MH_DUP_ADDR_DETECT_OFF);
+}
+
+
 /*****************************************************************************/
 extern esi_t *zero_esi;
 extern void zebra_evpn_mh_init(void);