zebra: mpls entry interface lookup adaptation for vrf backend

The search algorithm for interface based on ifindex only is adapted to
vrf netns based too. Only the default netns will be used to search the
interface index.

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

zebra/zebra_mpls.c

@@ -38,6 +38,7 @@
 
 #include "zebra/rib.h"
 #include "zebra/rt.h"
+#include "zebra/interface.h"
 #include "zebra/zserv.h"
 #include "zebra/redistribute.h"
 #include "zebra/debug.h"
@@ -704,6 +705,7 @@ static int nhlfe_nexthop_active(zebra_nhlfe_t *nhlfe)
 {
 	struct nexthop *nexthop;
 	struct interface *ifp;
+	struct zebra_ns *zns;
 
 	nexthop = nhlfe->nexthop;
 	if (!nexthop) // unexpected
@@ -721,7 +723,8 @@ static int nhlfe_nexthop_active(zebra_nhlfe_t *nhlfe)
 		 * which will not be in the default
 		 * VRF.  So let's look in all of them
 		 */
-		ifp = if_lookup_by_index(nexthop->ifindex, VRF_UNKNOWN);
+		zns = zebra_ns_lookup(NS_DEFAULT);
+		ifp = if_lookup_by_index_per_ns(zns, nexthop->ifindex);
 		if (ifp && if_is_operative(ifp))
 			SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE);
 		else
@@ -2752,10 +2755,13 @@ void zebra_mpls_print_lsp_table(struct vty *vty, struct zebra_vrf *zvrf,
 
 				switch (nexthop->type) {
 				case NEXTHOP_TYPE_IFINDEX: {
+					struct zebra_ns *zns;
 					struct interface *ifp;
 
-					ifp = if_lookup_by_index(
-						nexthop->ifindex, VRF_UNKNOWN);
+					zns = zebra_ns_lookup(NS_DEFAULT);
+					ifp = if_lookup_by_index_per_ns(
+							zns,
+							nexthop->ifindex);
 					vty_out(vty, "%15s", ifp->name);
 					break;
 				}