sctp_assoc_change
struct sctp_assoc_change sn_assoc_change;
struct sctp_assoc_change *sac;
sac = mtod(m_notify, struct sctp_assoc_change *);
sac->sac_length = sizeof(struct sctp_assoc_change);
m_notify->m_pkthdr.len = sizeof(struct sctp_assoc_change);
m_notify->m_len = sizeof(struct sctp_assoc_change);