Function sctp_process_initack_addresses

freebsd/netinet/sctp_asconf.c:2751–2878

* processes the (local) addresses in the INIT-ACK chunk */

 * processes the (local) addresses in the INIT-ACK chunk
 */
static void
sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m,
    unsigned int offset, unsigned int length)
{
	struct sctp_paramhdr tmp_param, *ph;
	uint16_t plen, ptype;
	struct sctp_ifa *sctp_ifa;
	union sctp_sockstore store;
#ifdef INET6
	struct sctp_ipv6addr_param addr6_store;
#endif
#ifdef INET
	struct sctp_ipv4addr_param addr4_store;
#endif

	SCTPDBG(SCTP_DEBUG_ASCONF2, "processing init-ack addresses\n");
	if (stcb == NULL)	/* Un-needed check for SA */
		return;

	/* convert to upper bound */
	length += offset;

	if ((offset + sizeof(struct sctp_paramhdr)) > length) {
		return;
	}
	/* go through the addresses in the init-ack */
	ph = (struct sctp_paramhdr *)
	    sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
	    (uint8_t *)&tmp_param);
	while (ph != NULL) {
		ptype = ntohs(ph->param_type);
		plen = ntohs(ph->param_length);
		switch (ptype) {
#ifdef INET6
		case SCTP_IPV6_ADDRESS:
			{
				struct sctp_ipv6addr_param *a6p;

				/* get the entire IPv6 address param */
				a6p = (struct sctp_ipv6addr_param *)
				    sctp_m_getptr(m, offset,
				    sizeof(struct sctp_ipv6addr_param),
				    (uint8_t *)&addr6_store);
				if (plen != sizeof(struct sctp_ipv6addr_param) ||
				    a6p == NULL) {
					return;
				}
				memset(&store, 0, sizeof(union sctp_sockstore));
				store.sin6.sin6_family = AF_INET6;
				store.sin6.sin6_len = sizeof(struct sockaddr_in6);
				store.sin6.sin6_port = stcb->rport;
				memcpy(&store.sin6.sin6_addr, a6p->addr, sizeof(struct in6_addr));
				break;
			}
#endif
#ifdef INET
		case SCTP_IPV4_ADDRESS:
			{