ip6_process_hopopts
if (ip6_process_hopopts(mp, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
if (ip6_process_hopopts(&m, (u_int8_t *)(hbh + 1),
int ip6_process_hopopts(struct mbuf **, u_int8_t *, int, u_int32_t *,