char *l3_hdr = (char *)eth_hdr + mbuf->l2_len;
struct ipv4_hdr *ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
struct ipv6_hdr *ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
char *l3_hdr = (char *)eth_hdr + mbuf->l2_len;
struct ipv4_hdr *ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
struct ipv6_hdr *ipv6_hdr = (struct ipv6_hdr *)l3_hdr;