lib: fix for nexthop lookup of recursive routes

For cases where the real nexthop changes for a recursive route, FRR fails to update second level routes depending on this route.

Signed-off-by: Piotr Suchy <psuchy@akamai.com>

lib/nexthop.c

@@ -163,6 +163,11 @@ static int _nexthop_cmp_no_labels(const struct nexthop *next1,
 			return 1;
 	}
 
+	ret = memcmp(next1->rmac.octet, next2->rmac.octet, ETH_ALEN);
+	if (0 != ret) {
+		return ret;
+	}
+
 	switch (next1->type) {
 	case NEXTHOP_TYPE_IPV4:
 	case NEXTHOP_TYPE_IPV6:
@@ -440,6 +445,11 @@ bool nexthop_same(const struct nexthop *nh1, const struct nexthop *nh2)
 	if (nexthop_cmp(nh1, nh2) != 0)
 		return false;
 
+	if (nh1->resolved && nh2->resolved && nh1->resolved != nh1 && nh1->resolved != nh2 &&
+	    nh2->resolved != nh1 && nh2->resolved != nh2) {
+		return nexthop_same(nh1->resolved, nh2->resolved);
+	}
+
 	return true;
 }