pimd: Update nexthops when lookup mode changes

Link up the RPF lookup mode changing to a force update to RP's and upstreams registered for nexthop lookup cache updates. Signed-off-by: Nathan Bahr <[email protected]>
FRRouting · Dec 13, 2024 · 9ce7f9b · 9ce7f9b
1 parent 6d30c8f
commit 9ce7f9b
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/pimd/pim_nb_config.c b/pimd/pim_nb_config.c
@@ -1867,7 +1867,12 @@ int routing_control_plane_protocols_control_plane_protocol_pim_address_family_mc
 		old_mode = pim->rpf_mode;
 		pim->rpf_mode = yang_dnode_get_enum(args->dnode, NULL);
 
-		/* TODO: Signal to redo lookups? */
+		if (pim->rpf_mode != old_mode &&
+		    /* MCAST_MIX_MRIB_FIRST is the default if not configured */
+		    (old_mode != MCAST_NO_CONFIG && pim->rpf_mode != MCAST_MIX_MRIB_FIRST)) {
+			pim_nht_mode_changed(pim);
+		}
+
 		break;
 	}
 

diff --git a/pimd/pim_nht.h b/pimd/pim_nht.h
@@ -117,6 +117,9 @@ int pim_nht_lookup_ecmp_if_vif_index(struct pim_instance *pim, pim_addr src, str
 /* Tracked nexthop update from zebra */
 void pim_nexthop_update(struct vrf *vrf, struct prefix *match, struct zapi_route *nhr);
 
+/* RPF lookup mode changed via configuration */
+void pim_nht_mode_changed(struct pim_instance *pim);
+
 /* NHT init and finish funcitons */
 void pim_nht_init(struct pim_instance *pim);
 void pim_nht_terminate(struct pim_instance *pim);