Add support for parsing PW Ethernet and Enhanced MPLS parsing

src/packet/ipv4_utils.h

@@ -256,6 +256,10 @@ static inline void ipv4_hdr_set_opt_data(struct ip *hdr, const char *opt_data)
     memcpy((char *)hdr + sizeof(struct ip), opt_data, ipv4_hdr_get_opt_len(hdr));
 }
 
+/******************************************************************************
+ * print
+ ******************************************************************************/
+
 static inline int ipv4_hdr_to_str(const struct ip *hdr, char *buf, size_t size)
 {
     memset(buf, 0, size);