zebra: When installing a mroute, allow it to flow

Currently the mroute code was not allowing the mroute
to be sent to the dataplane.  This leaves us with a
situation where the routes being installed where never
being set as installed and additionally nht against
the mrib would not work if the route came into existence
after the nexthop tracking was asked for.

Turns out all the pieces where there to let this work.
Modify the code to pass it to the dplane and to send
it back up as having worked.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

zebra/dplane_fpm_nl.c

@@ -1712,6 +1712,16 @@ static int fpm_nl_process(struct zebra_dplane_provider *prov)
 		 * anyway.
 		 */
 		if (fnc->socket != -1 && fnc->connecting == false) {
+			enum dplane_op_e op = dplane_ctx_get_op(ctx);
+
+			/*
+			 * Just skip multicast routes and let them flow through
+			 */
+			if ((op == DPLANE_OP_ROUTE_DELETE || op == DPLANE_OP_ROUTE_INSTALL ||
+			     op == DPLANE_OP_ROUTE_UPDATE) &&
+			    dplane_ctx_get_safi(ctx) == SAFI_MULTICAST)
+				goto skip;
+
 			frr_with_mutex (&fnc->ctxqueue_mutex) {
 				dplane_ctx_enqueue_tail(&fnc->ctxqueue, ctx);
 				cur_queue =
@@ -1722,7 +1732,7 @@ static int fpm_nl_process(struct zebra_dplane_provider *prov)
 				peak_queue = cur_queue;
 			continue;
 		}
-
+skip:
 		dplane_ctx_set_status(ctx, ZEBRA_DPLANE_REQUEST_SUCCESS);
 		dplane_provider_enqueue_out_ctx(prov, ctx);
 	}

zebra/rt_netlink.c

@@ -3178,6 +3178,9 @@ netlink_put_route_update_msg(struct nl_batch *bth, struct zebra_dplane_ctx *ctx)
 	} else
 		return FRR_NETLINK_ERROR;
 
+	if (dplane_ctx_get_safi(ctx) == SAFI_MULTICAST)
+		return FRR_NETLINK_SUCCESS;
+
 	if (RSYSTEM_ROUTE(dplane_ctx_get_type(ctx)))
 		return FRR_NETLINK_SUCCESS;
 

zebra/rt_socket.c

@@ -317,25 +317,25 @@ enum zebra_dplane_result kernel_route_update(struct zebra_dplane_ctx *ctx)
 	frr_with_privs(&zserv_privs) {
 
 		if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_DELETE) {
-			if (!RSYSTEM_ROUTE(type))
+			if (!RSYSTEM_ROUTE(type) && dplane_ctx_get_safi(ctx) != SAFI_MULTICAST)
 				kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx),
 					   dplane_ctx_get_ng(ctx),
 					   dplane_ctx_get_metric(ctx));
 		} else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_INSTALL) {
-			if (!RSYSTEM_ROUTE(type))
+			if (!RSYSTEM_ROUTE(type) && dplane_ctx_get_safi(ctx) != SAFI_MULTICAST)
 				kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx),
 					   dplane_ctx_get_ng(ctx),
 					   dplane_ctx_get_metric(ctx));
 		} else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_UPDATE) {
 			/* Must do delete and add separately -
 			 * no update available
 			 */
-			if (!RSYSTEM_ROUTE(old_type))
+			if (!RSYSTEM_ROUTE(old_type) && dplane_ctx_get_safi(ctx) != SAFI_MULTICAST)
 				kernel_rtm(RTM_DELETE, dplane_ctx_get_dest(ctx),
 					   dplane_ctx_get_old_ng(ctx),
 					   dplane_ctx_get_old_metric(ctx));
 
-			if (!RSYSTEM_ROUTE(type))
+			if (!RSYSTEM_ROUTE(type) && dplane_ctx_get_safi(ctx) != SAFI_MULTICAST)
 				kernel_rtm(RTM_ADD, dplane_ctx_get_dest(ctx),
 					   dplane_ctx_get_ng(ctx),
 					   dplane_ctx_get_metric(ctx));

zebra/zebra_rib.c

@@ -637,19 +637,12 @@ int zebra_rib_labeled_unicast(struct route_entry *re)
 void rib_install_kernel(struct route_node *rn, struct route_entry *re,
 			struct route_entry *old)
 {
-	struct nexthop *nexthop;
 	struct rib_table_info *info = srcdest_rnode_table_info(rn);
 	struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(re->vrf_id);
 	enum zebra_dplane_result ret;
 
 	rib_dest_t *dest = rib_dest_from_rnode(rn);
 
-	if (info->safi != SAFI_UNICAST) {
-		for (ALL_NEXTHOPS(re->nhe->nhg, nexthop))
-			SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
-		return;
-	}
-
 	/*
 	 * Install the resolved nexthop object first.
 	 */
@@ -716,17 +709,8 @@ void rib_install_kernel(struct route_node *rn, struct route_entry *re,
 /* Uninstall the route from kernel. */
 void rib_uninstall_kernel(struct route_node *rn, struct route_entry *re)
 {
-	struct nexthop *nexthop;
-	struct rib_table_info *info = srcdest_rnode_table_info(rn);
 	struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(re->vrf_id);
 
-	if (info->safi != SAFI_UNICAST) {
-		UNSET_FLAG(re->status, ROUTE_ENTRY_INSTALLED);
-		for (ALL_NEXTHOPS(re->nhe->nhg, nexthop))
-			UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
-		return;
-	}
-
 	/*
 	 * Make sure we update the FPM any time we send new information to
 	 * the dataplane.