sctp_bind.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * CDDL HEADER START
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * The contents of this file are subject to the terms of the
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Common Development and Distribution License, Version 1.0 only
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * (the "License"). You may not use this file except in compliance
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * with the License.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * See the License for the specific language governing permissions
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * and limitations under the License.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * When distributing Covered Code, include this CDDL HEADER in each
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If applicable, add the following below this CDDL HEADER, with the
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * fields enclosed by brackets "[]" replaced with your own identifying
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * information: Portions Copyright [yyyy] [name of copyright owner]
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * CDDL HEADER END
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Use is subject to license terms.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster#pragma ident "%Z%%M% %I% %E% SMI"
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Returns 0 on success, EACCES on permission failure.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_select_port(sctp_t *sctp, in_port_t *requested_port, int *user_specified)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Get a valid port (within the anonymous range and should not
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * be a privileged one) to use if the user has not given a port.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If multiple threads are here, they may all start with
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * with the same initial port. But, it should be fine as long as
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * sctp_bindi will ensure that no two threads will be assigned
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * the same port.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster *requested_port = sctp_update_next_port(sctp_next_port_to_try);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If the requested_port is in the well-known privileged range,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * verify that the stream was opened by a privileged user.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Note: No locks are held when inspecting sctp_g_*epriv_ports
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * but instead the code relies on:
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * - the fact that the address of the array and its size never
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * - the atomic assignment of the elements of the array
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (*requested_port < sctp_smallest_nonpriv_port) {
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster for (i = 0; i < sctp_g_num_epriv_ports; i++) {
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (*requested_port == sctp_g_epriv_ports[i]) {
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * sctp_bind() should take a cred_t argument so that
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * we can use it here.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster ("sctp_bind(x): no prive for port %d",
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * TCP handles listen() increasing the backlog, need to check
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * if it should be handled here too - VENU.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* Do an anonymous bind for unbound socket doing listen(). */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if ((ret = sctp_bind(sctp, (struct sockaddr *)&ss,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster sizeof (ss))) != 0)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster (void) random_get_pseudo_bytes(sctp->sctp_secret, SCTP_SECRET_LEN);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster tf = &sctp_listen_fanout[SCTP_LISTEN_HASH(ntohs(sctp->sctp_lport))];
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Bind the sctp_t to a sockaddr, which includes an address and other
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * information, such as port or flowinfo.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_bind(sctp_t *sctp, struct sockaddr *sa, socklen_t len)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster requested_port = ntohs(((struct sockaddr_in *)sa)->sin_port);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster requested_port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* Set the flowinfo. */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster (IPV6_DEFAULT_VERS_AND_FLOW & IPV6_VERS_AND_FLOW_MASK) |
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster bind_to_req_port_only = requested_port == 0 ? B_FALSE : B_TRUE;
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (sctp_select_port(sctp, &requested_port, &user_specified) != 0) {
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if ((err = sctp_bind_add(sctp, sa, 1, B_TRUE)) != 0)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster allocated_port = sctp_bindi(sctp, requested_port,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Perform bind/unbind operation of a list of addresses on a sctp_t
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_bindx(sctp_t *sctp, const void *addrs, int addrcnt, int bindop)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster return (sctp_bind_add(sctp, addrs, addrcnt, B_FALSE));
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster return (sctp_bind_del(sctp, addrs, addrcnt, B_FALSE));
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Add a list of addresses to a sctp_t.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_bind_add(sctp_t *sctp, const void *addrs, uint32_t addrcnt,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (sctp->sctp_state > SCTPS_LISTEN && sctp_addip_enabled)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster err = sctp_valid_addr_list(sctp, addrs, addrcnt);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* Need to send ASCONF messages */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster sctp_del_saddr_list(sctp, addrs, addrcnt, B_FALSE);
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Remove one or more addresses bound to the sctp_t.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_bind_del(sctp_t *sctp, const void *addrs, uint32_t addrcnt,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (sctp->sctp_state > SCTPS_LISTEN && sctp_addip_enabled)
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* Can't delete the last address nor all of the addresses */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster if (sctp->sctp_nsaddrs == 1 || addrcnt >= sctp->sctp_nsaddrs) {
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If the "bind_to_req_port_only" parameter is set, if the requested port
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * number is available, return it, If not return 0
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If "bind_to_req_port_only" parameter is not set and
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If the requested port number is available, return it. If not, return
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * the first anonymous port we happen across. If no anonymous ports are
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * available, return 0. addr is the requested local address, if any.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * In either case, when succeeding update the sctp_t to record the port number
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * and insert it in the bind hash table.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Fostersctp_bindi(sctp_t *sctp, in_port_t port, int bind_to_req_port_only,
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* number of times we have run around the loop */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* maximum number of times to run around the loop */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Lookup for free addresses is done in a loop and "loopmax"
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * influences how long we spin in the loop
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If the requested port is busy, don't bother to look
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * for a new one. Setting loop maximum count to 1 has
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * that effect.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * If the requested port is busy, look for a free one
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * in the anonymous port range.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Set loopmax appropriately so that one does not look
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * forever in the case all of the anonymous ports are in use.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Ensure that the sctp_t is not currently in the bind hash.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Hold the lock on the hash bucket to ensure that
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * the duplicate check plus the insertion is an atomic
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * operation.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * This function does an inline lookup on the bind hash list
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * Make sure that we access only members of sctp_t
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * and that we don't look at sctp_sctp, since we are not
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * doing a SCTPB_REFHOLD. For more details please see the notes
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * in sctp_compress()
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* in use */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * socket option SO_REUSEADDR is set
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * on the binding sctp_t.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * We have found a match of IP source
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * address and source port, which is
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * refused regardless of the
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * SO_REUSEADDR setting, so we break.
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster /* The port number is busy */
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * This port is ours. Insert in fanout and mark as
8af80418ba1ec431c8027fa9668e5678658d3611Allan Foster * bound to prevent others from getting the port
if (user_specified != 0)
return (port);
return (port);
user_specified = 0;
for (i = 0; i < sctp_g_num_epriv_ports; i++) {
port++;
goto retry;
return (port);