Nexthop: Fixed recursive route mpls label merging

lib/ip.h

@@ -326,6 +326,11 @@ static inline ip6_addr ip6_ntoh(ip6_addr a)
 { return _MI6(ntohl(_I0(a)), ntohl(_I1(a)), ntohl(_I2(a)), ntohl(_I3(a))); }
 
 #define MPLS_MAX_LABEL_STACK 8
+typedef struct mpls_label_stack {
+  uint len;
+  u32 stack[MPLS_MAX_LABEL_STACK];
+} mpls_label_stack;
+
 static inline int
 mpls_get(const char *buf, int buflen, u32 *stack)
 {