sctp_find_ifa_by_addr
aa->ifa = sctp_find_ifa_by_addr(sa);
ifa = sctp_find_ifa_by_addr(sa);
ifa = sctp_find_ifa_by_addr(sa);
ifa = sctp_find_ifa_by_addr((struct sockaddr *)&store_sa);
struct ifaddr *sctp_find_ifa_by_addr(struct sockaddr *sa);