sctp_delayed_cksum
sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
sctp_delayed_cksum(m0, hlen);
void sctp_delayed_cksum(struct mbuf *, uint32_t offset);
sctp_delayed_cksum(m, offset);
sctp_delayed_cksum(m, offset);
sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen);
sctp_delayed_cksum(m, (uint32_t)(ip1->ip_hl << 2));
sctp_delayed_cksum(m, sizeof(struct ip6_hdr));