sctp_paddr_change
struct sctp_paddr_change sn_paddr_change;
struct sctp_paddr_change *spc;
spc = mtod(m_notify, struct sctp_paddr_change *);
spc->spc_length = sizeof(struct sctp_paddr_change);
m_notify->m_pkthdr.len = sizeof(struct sctp_paddr_change);
m_notify->m_len = sizeof(struct sctp_paddr_change);