mobhdr
struct mobhdr *mh;
hlen = sizeof(struct mobhdr);
mh = (struct mobhdr *)mtodo(m, sizeof(struct ip));
if (hlen != sizeof(struct mobhdr)) {
hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
struct mobhdr mh;
hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
hlen = sizeof(struct mobhdr);
#define MEMTU (1500 - sizeof(struct mobhdr))
.min_length = sizeof(struct ip) + sizeof(struct mobhdr) -