Function AddSctpAssocLocal

freebsd/netinet/libalias/alias_sctp.c:2220–2260

@ingroup Hash * @brief Add the sctp association information to the local look up table * * Searches the local look-up table for an existing association with the same * details. If a match exists and is ONLY in the local look-up table then this * is a repeated INIT packet, we need to remove this association from the * look-up table and add the new association * * The new association is add

 * @return SN_ADD_OK | SN_ADD_CLASH
 */
static int
AddSctpAssocLocal(struct libalias *la, struct sctp_nat_assoc *assoc, struct in_addr g_addr)
{
	struct sctp_nat_assoc *found;

	LIBALIAS_LOCK_ASSERT(la);
	found = FindSctpLocal(la, assoc->l_addr, g_addr, assoc->l_vtag, assoc->l_port, assoc->g_port);
	/*
	 * Note that if a different global address initiated this Init,
	 * ie it wasn't resent as presumed:
	 *  - the local receiver if receiving it for the first time will establish
	 *    an association with the new global host
	 *  - if receiving an init from a different global address after sending a
	 *    lost initack it will send an initack to the new global host, the first
	 *    association attempt will then be blocked if retried.
	 */
	if (found != NULL) {
		if ((found->TableRegister == SN_LOCAL_TBL) && (found->g_port == assoc->g_port)) { /* resent message */
			RmSctpAssoc(la, found);
			sctp_RmTimeOut(la, found);
			freeGlobalAddressList(found);
			sn_free(found);
		} else
			return (SN_ADD_CLASH);
	}

	LIST_INSERT_HEAD(&la->sctpTableLocal[SN_TABLE_HASH(assoc->l_vtag, assoc->l_port, la->sctpNatTableSize)],
	    assoc, list_L);
	assoc->TableRegister |= SN_LOCAL_TBL;
	la->sctpLinkCount++; //increment link count

	if (assoc->TableRegister == SN_BOTH_TBL) {
		/* libalias log -- controlled by libalias */
		if (la->packetAliasMode & PKT_ALIAS_LOG)
			SctpShowAliasStats(la);

		SN_LOG(SN_LOG_INFO, logsctpassoc(assoc, "^"));
	}

	return (SN_ADD_OK);
}

/** @ingroup Hash
 * @brief  Add the sctp association information to the global look up table