1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel reference Implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * The SCTP reference implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * The SCTP reference implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock *sk);
89 static void sctp_wfree(struct sk_buff *skb);
90 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
92 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
93 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
94 static int sctp_wait_for_accept(struct sock *sk, long timeo);
95 static void sctp_wait_for_close(struct sock *sk, long timeo);
96 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
97 union sctp_addr *addr, int len);
98 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
99 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
102 static int sctp_send_asconf(struct sctp_association *asoc,
103 struct sctp_chunk *chunk);
104 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
105 static int sctp_autobind(struct sock *sk);
106 static void sctp_sock_migrate(struct sock *, struct sock *,
107 struct sctp_association *, sctp_socket_type_t);
108 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
110 extern kmem_cache_t *sctp_bucket_cachep;
112 /* Get the sndbuf space available at the time on the association. */
113 static inline int sctp_wspace(struct sctp_association *asoc)
115 struct sock *sk = asoc->base.sk;
118 if (asoc->ep->sndbuf_policy) {
119 /* make sure that no association uses more than sk_sndbuf */
120 amt = sk->sk_sndbuf - asoc->sndbuf_used;
122 /* do socket level accounting */
123 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
132 /* Increment the used sndbuf space count of the corresponding association by
133 * the size of the outgoing data chunk.
134 * Also, set the skb destructor for sndbuf accounting later.
136 * Since it is always 1-1 between chunk and skb, and also a new skb is always
137 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
138 * destructor in the data chunk skb for the purpose of the sndbuf space
141 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
143 struct sctp_association *asoc = chunk->asoc;
144 struct sock *sk = asoc->base.sk;
146 /* The sndbuf space is tracked per association. */
147 sctp_association_hold(asoc);
149 skb_set_owner_w(chunk->skb, sk);
151 chunk->skb->destructor = sctp_wfree;
152 /* Save the chunk pointer in skb for sctp_wfree to use later. */
153 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
155 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
156 sizeof(struct sk_buff) +
157 sizeof(struct sctp_chunk);
159 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
162 /* Verify that this is a valid address. */
163 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
168 /* Verify basic sockaddr. */
169 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
173 /* Is this a valid SCTP address? */
174 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
177 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
183 /* Look up the association by its id. If this is not a UDP-style
184 * socket, the ID field is always ignored.
186 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
188 struct sctp_association *asoc = NULL;
190 /* If this is not a UDP-style socket, assoc id should be ignored. */
191 if (!sctp_style(sk, UDP)) {
192 /* Return NULL if the socket state is not ESTABLISHED. It
193 * could be a TCP-style listening socket or a socket which
194 * hasn't yet called connect() to establish an association.
196 if (!sctp_sstate(sk, ESTABLISHED))
199 /* Get the first and the only association from the list. */
200 if (!list_empty(&sctp_sk(sk)->ep->asocs))
201 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
202 struct sctp_association, asocs);
206 /* Otherwise this is a UDP-style socket. */
207 if (!id || (id == (sctp_assoc_t)-1))
210 spin_lock_bh(&sctp_assocs_id_lock);
211 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
212 spin_unlock_bh(&sctp_assocs_id_lock);
214 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
220 /* Look up the transport from an address and an assoc id. If both address and
221 * id are specified, the associations matching the address and the id should be
224 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
225 struct sockaddr_storage *addr,
228 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
229 struct sctp_transport *transport;
230 union sctp_addr *laddr = (union sctp_addr *)addr;
233 flip_to_h(&tmp, laddr);
234 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
241 id_asoc = sctp_id2assoc(sk, id);
242 if (id_asoc && (id_asoc != addr_asoc))
245 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
246 (union sctp_addr *)addr);
251 /* API 3.1.2 bind() - UDP Style Syntax
252 * The syntax of bind() is,
254 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
256 * sd - the socket descriptor returned by socket().
257 * addr - the address structure (struct sockaddr_in or struct
258 * sockaddr_in6 [RFC 2553]),
259 * addr_len - the size of the address structure.
261 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
267 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
270 /* Disallow binding twice. */
271 if (!sctp_sk(sk)->ep->base.bind_addr.port)
272 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
277 sctp_release_sock(sk);
282 static long sctp_get_port_local(struct sock *, union sctp_addr *);
284 /* Verify this is a valid sockaddr. */
285 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
286 union sctp_addr *addr, int len)
290 /* Check minimum size. */
291 if (len < sizeof (struct sockaddr))
294 /* Does this PF support this AF? */
295 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
298 /* If we get this far, af is valid. */
299 af = sctp_get_af_specific(addr->sa.sa_family);
301 if (len < af->sockaddr_len)
307 /* Bind a local address either to an endpoint or to an association. */
308 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
310 struct sctp_sock *sp = sctp_sk(sk);
311 struct sctp_endpoint *ep = sp->ep;
312 struct sctp_bind_addr *bp = &ep->base.bind_addr;
318 /* Common sockaddr verification. */
319 af = sctp_sockaddr_af(sp, addr, len);
321 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
326 snum = ntohs(addr->v4.sin_port);
328 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
329 ", port: %d, new port: %d, len: %d)\n",
335 /* PF specific bind() address verification. */
336 if (!sp->pf->bind_verify(sp, addr))
337 return -EADDRNOTAVAIL;
339 /* We must either be unbound, or bind to the same port. */
340 if (bp->port && (snum != bp->port)) {
341 SCTP_DEBUG_PRINTK("sctp_do_bind:"
342 " New port %d does not match existing port "
343 "%d.\n", snum, bp->port);
347 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
350 /* Make sure we are allowed to bind here.
351 * The function sctp_get_port_local() does duplicate address
354 if ((ret = sctp_get_port_local(sk, addr))) {
355 if (ret == (long) sk) {
356 /* This endpoint has a conflicting address. */
363 /* Refresh ephemeral port. */
365 bp->port = inet_sk(sk)->num;
367 /* Add the address to the bind address list. */
368 sctp_local_bh_disable();
369 sctp_write_lock(&ep->base.addr_lock);
371 /* Use GFP_ATOMIC since BHs are disabled. */
372 flip_to_h(&tmp, addr);
373 ret = sctp_add_bind_addr(bp, &tmp, 1, GFP_ATOMIC);
374 sctp_write_unlock(&ep->base.addr_lock);
375 sctp_local_bh_enable();
377 /* Copy back into socket for getsockname() use. */
379 inet_sk(sk)->sport = htons(inet_sk(sk)->num);
380 af->to_sk_saddr(addr, sk);
386 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
388 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
389 * at any one time. If a sender, after sending an ASCONF chunk, decides
390 * it needs to transfer another ASCONF Chunk, it MUST wait until the
391 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
392 * subsequent ASCONF. Note this restriction binds each side, so at any
393 * time two ASCONF may be in-transit on any given association (one sent
394 * from each endpoint).
396 static int sctp_send_asconf(struct sctp_association *asoc,
397 struct sctp_chunk *chunk)
401 /* If there is an outstanding ASCONF chunk, queue it for later
404 if (asoc->addip_last_asconf) {
405 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
409 /* Hold the chunk until an ASCONF_ACK is received. */
410 sctp_chunk_hold(chunk);
411 retval = sctp_primitive_ASCONF(asoc, chunk);
413 sctp_chunk_free(chunk);
415 asoc->addip_last_asconf = chunk;
421 /* Add a list of addresses as bind addresses to local endpoint or
424 * Basically run through each address specified in the addrs/addrcnt
425 * array/length pair, determine if it is IPv6 or IPv4 and call
426 * sctp_do_bind() on it.
428 * If any of them fails, then the operation will be reversed and the
429 * ones that were added will be removed.
431 * Only sctp_setsockopt_bindx() is supposed to call this function.
433 int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
438 struct sockaddr *sa_addr;
441 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
445 for (cnt = 0; cnt < addrcnt; cnt++) {
446 /* The list may contain either IPv4 or IPv6 address;
447 * determine the address length for walking thru the list.
449 sa_addr = (struct sockaddr *)addr_buf;
450 af = sctp_get_af_specific(sa_addr->sa_family);
456 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
459 addr_buf += af->sockaddr_len;
463 /* Failed. Cleanup the ones that have been added */
465 sctp_bindx_rem(sk, addrs, cnt);
473 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
474 * associations that are part of the endpoint indicating that a list of local
475 * addresses are added to the endpoint.
477 * If any of the addresses is already in the bind address list of the
478 * association, we do not send the chunk for that association. But it will not
479 * affect other associations.
481 * Only sctp_setsockopt_bindx() is supposed to call this function.
483 static int sctp_send_asconf_add_ip(struct sock *sk,
484 struct sockaddr *addrs,
487 struct sctp_sock *sp;
488 struct sctp_endpoint *ep;
489 struct sctp_association *asoc;
490 struct sctp_bind_addr *bp;
491 struct sctp_chunk *chunk;
492 struct sctp_sockaddr_entry *laddr;
493 union sctp_addr *addr;
494 union sctp_addr saveaddr;
497 struct list_head *pos;
502 if (!sctp_addip_enable)
508 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
509 __FUNCTION__, sk, addrs, addrcnt);
511 list_for_each(pos, &ep->asocs) {
512 asoc = list_entry(pos, struct sctp_association, asocs);
514 if (!asoc->peer.asconf_capable)
517 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
520 if (!sctp_state(asoc, ESTABLISHED))
523 /* Check if any address in the packed array of addresses is
524 * in the bind address list of the association. If so,
525 * do not send the asconf chunk to its peer, but continue with
526 * other associations.
529 for (i = 0; i < addrcnt; i++) {
530 addr = (union sctp_addr *)addr_buf;
531 af = sctp_get_af_specific(addr->v4.sin_family);
537 if (sctp_assoc_lookup_laddr(asoc, addr))
540 addr_buf += af->sockaddr_len;
545 /* Use the first address in bind addr list of association as
546 * Address Parameter of ASCONF CHUNK.
548 sctp_read_lock(&asoc->base.addr_lock);
549 bp = &asoc->base.bind_addr;
550 p = bp->address_list.next;
551 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
552 sctp_read_unlock(&asoc->base.addr_lock);
554 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a_h, addrs,
555 addrcnt, SCTP_PARAM_ADD_IP);
561 retval = sctp_send_asconf(asoc, chunk);
565 /* Add the new addresses to the bind address list with
566 * use_as_src set to 0.
568 sctp_local_bh_disable();
569 sctp_write_lock(&asoc->base.addr_lock);
571 for (i = 0; i < addrcnt; i++) {
572 addr = (union sctp_addr *)addr_buf;
573 af = sctp_get_af_specific(addr->v4.sin_family);
574 memcpy(&saveaddr, addr, af->sockaddr_len);
575 saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
576 retval = sctp_add_bind_addr(bp, &saveaddr, 0,
578 addr_buf += af->sockaddr_len;
580 sctp_write_unlock(&asoc->base.addr_lock);
581 sctp_local_bh_enable();
588 /* Remove a list of addresses from bind addresses list. Do not remove the
591 * Basically run through each address specified in the addrs/addrcnt
592 * array/length pair, determine if it is IPv6 or IPv4 and call
593 * sctp_del_bind() on it.
595 * If any of them fails, then the operation will be reversed and the
596 * ones that were removed will be added back.
598 * At least one address has to be left; if only one address is
599 * available, the operation will return -EBUSY.
601 * Only sctp_setsockopt_bindx() is supposed to call this function.
603 int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
605 struct sctp_sock *sp = sctp_sk(sk);
606 struct sctp_endpoint *ep = sp->ep;
608 struct sctp_bind_addr *bp = &ep->base.bind_addr;
610 union sctp_addr saveaddr;
612 struct sockaddr *sa_addr;
615 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
619 for (cnt = 0; cnt < addrcnt; cnt++) {
620 /* If the bind address list is empty or if there is only one
621 * bind address, there is nothing more to be removed (we need
622 * at least one address here).
624 if (list_empty(&bp->address_list) ||
625 (sctp_list_single_entry(&bp->address_list))) {
630 /* The list may contain either IPv4 or IPv6 address;
631 * determine the address length to copy the address to
634 sa_addr = (struct sockaddr *)addr_buf;
635 af = sctp_get_af_specific(sa_addr->sa_family);
640 memcpy(&saveaddr, sa_addr, af->sockaddr_len);
641 saveaddr.v4.sin_port = ntohs(saveaddr.v4.sin_port);
642 if (saveaddr.v4.sin_port != bp->port) {
647 /* FIXME - There is probably a need to check if sk->sk_saddr and
648 * sk->sk_rcv_addr are currently set to one of the addresses to
649 * be removed. This is something which needs to be looked into
650 * when we are fixing the outstanding issues with multi-homing
651 * socket routing and failover schemes. Refer to comments in
652 * sctp_do_bind(). -daisy
654 sctp_local_bh_disable();
655 sctp_write_lock(&ep->base.addr_lock);
657 retval = sctp_del_bind_addr(bp, &saveaddr);
659 sctp_write_unlock(&ep->base.addr_lock);
660 sctp_local_bh_enable();
662 addr_buf += af->sockaddr_len;
665 /* Failed. Add the ones that has been removed back */
667 sctp_bindx_add(sk, addrs, cnt);
675 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
676 * the associations that are part of the endpoint indicating that a list of
677 * local addresses are removed from the endpoint.
679 * If any of the addresses is already in the bind address list of the
680 * association, we do not send the chunk for that association. But it will not
681 * affect other associations.
683 * Only sctp_setsockopt_bindx() is supposed to call this function.
685 static int sctp_send_asconf_del_ip(struct sock *sk,
686 struct sockaddr *addrs,
689 struct sctp_sock *sp;
690 struct sctp_endpoint *ep;
691 struct sctp_association *asoc;
692 struct sctp_transport *transport;
693 struct sctp_bind_addr *bp;
694 struct sctp_chunk *chunk;
695 union sctp_addr *laddr;
698 struct list_head *pos, *pos1;
699 struct sctp_sockaddr_entry *saddr;
703 if (!sctp_addip_enable)
709 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
710 __FUNCTION__, sk, addrs, addrcnt);
712 list_for_each(pos, &ep->asocs) {
713 asoc = list_entry(pos, struct sctp_association, asocs);
715 if (!asoc->peer.asconf_capable)
718 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
721 if (!sctp_state(asoc, ESTABLISHED))
724 /* Check if any address in the packed array of addresses is
725 * not present in the bind address list of the association.
726 * If so, do not send the asconf chunk to its peer, but
727 * continue with other associations.
730 for (i = 0; i < addrcnt; i++) {
731 laddr = (union sctp_addr *)addr_buf;
732 af = sctp_get_af_specific(laddr->v4.sin_family);
738 if (!sctp_assoc_lookup_laddr(asoc, laddr))
741 addr_buf += af->sockaddr_len;
746 /* Find one address in the association's bind address list
747 * that is not in the packed array of addresses. This is to
748 * make sure that we do not delete all the addresses in the
751 sctp_read_lock(&asoc->base.addr_lock);
752 bp = &asoc->base.bind_addr;
753 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
755 sctp_read_unlock(&asoc->base.addr_lock);
759 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
766 /* Reset use_as_src flag for the addresses in the bind address
767 * list that are to be deleted.
769 sctp_local_bh_disable();
770 sctp_write_lock(&asoc->base.addr_lock);
772 for (i = 0; i < addrcnt; i++) {
773 laddr = (union sctp_addr *)addr_buf;
774 af = sctp_get_af_specific(laddr->v4.sin_family);
775 list_for_each(pos1, &bp->address_list) {
776 saddr = list_entry(pos1,
777 struct sctp_sockaddr_entry,
779 if (sctp_cmp_addr_exact(&saddr->a, laddr))
780 saddr->use_as_src = 0;
782 addr_buf += af->sockaddr_len;
784 sctp_write_unlock(&asoc->base.addr_lock);
785 sctp_local_bh_enable();
787 /* Update the route and saddr entries for all the transports
788 * as some of the addresses in the bind address list are
789 * about to be deleted and cannot be used as source addresses.
791 list_for_each(pos1, &asoc->peer.transport_addr_list) {
792 transport = list_entry(pos1, struct sctp_transport,
794 dst_release(transport->dst);
795 sctp_transport_route(transport, NULL,
796 sctp_sk(asoc->base.sk));
799 retval = sctp_send_asconf(asoc, chunk);
805 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
808 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
811 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
812 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
815 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
816 * Section 3.1.2 for this usage.
818 * addrs is a pointer to an array of one or more socket addresses. Each
819 * address is contained in its appropriate structure (i.e. struct
820 * sockaddr_in or struct sockaddr_in6) the family of the address type
821 * must be used to distinguish the address length (note that this
822 * representation is termed a "packed array" of addresses). The caller
823 * specifies the number of addresses in the array with addrcnt.
825 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
826 * -1, and sets errno to the appropriate error code.
828 * For SCTP, the port given in each socket address must be the same, or
829 * sctp_bindx() will fail, setting errno to EINVAL.
831 * The flags parameter is formed from the bitwise OR of zero or more of
832 * the following currently defined flags:
834 * SCTP_BINDX_ADD_ADDR
836 * SCTP_BINDX_REM_ADDR
838 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
839 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
840 * addresses from the association. The two flags are mutually exclusive;
841 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
842 * not remove all addresses from an association; sctp_bindx() will
843 * reject such an attempt with EINVAL.
845 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
846 * additional addresses with an endpoint after calling bind(). Or use
847 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
848 * socket is associated with so that no new association accepted will be
849 * associated with those addresses. If the endpoint supports dynamic
850 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
851 * endpoint to send the appropriate message to the peer to change the
852 * peers address lists.
854 * Adding and removing addresses from a connected association is
855 * optional functionality. Implementations that do not support this
856 * functionality should return EOPNOTSUPP.
858 * Basically do nothing but copying the addresses from user to kernel
859 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
860 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
863 * We don't use copy_from_user() for optimization: we first do the
864 * sanity checks (buffer size -fast- and access check-healthy
865 * pointer); if all of those succeed, then we can alloc the memory
866 * (expensive operation) needed to copy the data to kernel. Then we do
867 * the copying without checking the user space area
868 * (__copy_from_user()).
870 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
873 * sk The sk of the socket
874 * addrs The pointer to the addresses in user land
875 * addrssize Size of the addrs buffer
876 * op Operation to perform (add or remove, see the flags of
879 * Returns 0 if ok, <0 errno code on error.
881 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
882 struct sockaddr __user *addrs,
883 int addrs_size, int op)
885 struct sockaddr *kaddrs;
889 struct sockaddr *sa_addr;
893 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
894 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
896 if (unlikely(addrs_size <= 0))
899 /* Check the user passed a healthy pointer. */
900 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
903 /* Alloc space for the address array in kernel memory. */
904 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
905 if (unlikely(!kaddrs))
908 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
913 /* Walk through the addrs buffer and count the number of addresses. */
915 while (walk_size < addrs_size) {
916 sa_addr = (struct sockaddr *)addr_buf;
917 af = sctp_get_af_specific(sa_addr->sa_family);
919 /* If the address family is not supported or if this address
920 * causes the address buffer to overflow return EINVAL.
922 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
927 addr_buf += af->sockaddr_len;
928 walk_size += af->sockaddr_len;
933 case SCTP_BINDX_ADD_ADDR:
934 err = sctp_bindx_add(sk, kaddrs, addrcnt);
937 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
940 case SCTP_BINDX_REM_ADDR:
941 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
944 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
958 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
960 * Common routine for handling connect() and sctp_connectx().
961 * Connect will come in with just a single address.
963 static int __sctp_connect(struct sock* sk,
964 struct sockaddr *kaddrs,
967 struct sctp_sock *sp;
968 struct sctp_endpoint *ep;
969 struct sctp_association *asoc = NULL;
970 struct sctp_association *asoc2;
971 struct sctp_transport *transport;
979 struct sockaddr *sa_addr;
985 /* connect() cannot be done on a socket that is already in ESTABLISHED
986 * state - UDP-style peeled off socket or a TCP-style socket that
987 * is already connected.
988 * It cannot be done even on a TCP-style listening socket.
990 if (sctp_sstate(sk, ESTABLISHED) ||
991 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
996 /* Walk through the addrs buffer and count the number of addresses. */
998 while (walk_size < addrs_size) {
999 sa_addr = (struct sockaddr *)addr_buf;
1000 af = sctp_get_af_specific(sa_addr->sa_family);
1002 /* If the address family is not supported or if this address
1003 * causes the address buffer to overflow return EINVAL.
1005 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1010 err = sctp_verify_addr(sk, (union sctp_addr *)sa_addr,
1015 memcpy(&to, sa_addr, af->sockaddr_len);
1016 to.v4.sin_port = ntohs(to.v4.sin_port);
1018 /* Check if there already is a matching association on the
1019 * endpoint (other than the one created here).
1021 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1022 if (asoc2 && asoc2 != asoc) {
1023 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1030 /* If we could not find a matching association on the endpoint,
1031 * make sure that there is no peeled-off association matching
1032 * the peer address even on another socket.
1034 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1035 err = -EADDRNOTAVAIL;
1040 /* If a bind() or sctp_bindx() is not called prior to
1041 * an sctp_connectx() call, the system picks an
1042 * ephemeral port and will choose an address set
1043 * equivalent to binding with a wildcard address.
1045 if (!ep->base.bind_addr.port) {
1046 if (sctp_autobind(sk)) {
1052 * If an unprivileged user inherits a 1-many
1053 * style socket with open associations on a
1054 * privileged port, it MAY be permitted to
1055 * accept new associations, but it SHOULD NOT
1056 * be permitted to open new associations.
1058 if (ep->base.bind_addr.port < PROT_SOCK &&
1059 !capable(CAP_NET_BIND_SERVICE)) {
1065 scope = sctp_scope(&to);
1066 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1073 /* Prime the peer's transport structures. */
1074 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1082 addr_buf += af->sockaddr_len;
1083 walk_size += af->sockaddr_len;
1086 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1091 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1096 /* Initialize sk's dport and daddr for getpeername() */
1097 inet_sk(sk)->dport = htons(asoc->peer.port);
1098 af = sctp_get_af_specific(to.sa.sa_family);
1099 af->to_sk_daddr(&to, sk);
1102 timeo = sock_sndtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
1103 err = sctp_wait_for_connect(asoc, &timeo);
1105 /* Don't free association on exit. */
1110 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1111 " kaddrs: %p err: %d\n",
1114 sctp_association_free(asoc);
1118 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1121 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
1123 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1124 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1125 * or IPv6 addresses.
1127 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1128 * Section 3.1.2 for this usage.
1130 * addrs is a pointer to an array of one or more socket addresses. Each
1131 * address is contained in its appropriate structure (i.e. struct
1132 * sockaddr_in or struct sockaddr_in6) the family of the address type
1133 * must be used to distengish the address length (note that this
1134 * representation is termed a "packed array" of addresses). The caller
1135 * specifies the number of addresses in the array with addrcnt.
1137 * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
1138 * -1, and sets errno to the appropriate error code.
1140 * For SCTP, the port given in each socket address must be the same, or
1141 * sctp_connectx() will fail, setting errno to EINVAL.
1143 * An application can use sctp_connectx to initiate an association with
1144 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1145 * allows a caller to specify multiple addresses at which a peer can be
1146 * reached. The way the SCTP stack uses the list of addresses to set up
1147 * the association is implementation dependant. This function only
1148 * specifies that the stack will try to make use of all the addresses in
1149 * the list when needed.
1151 * Note that the list of addresses passed in is only used for setting up
1152 * the association. It does not necessarily equal the set of addresses
1153 * the peer uses for the resulting association. If the caller wants to
1154 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1155 * retrieve them after the association has been set up.
1157 * Basically do nothing but copying the addresses from user to kernel
1158 * land and invoking either sctp_connectx(). This is used for tunneling
1159 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1161 * We don't use copy_from_user() for optimization: we first do the
1162 * sanity checks (buffer size -fast- and access check-healthy
1163 * pointer); if all of those succeed, then we can alloc the memory
1164 * (expensive operation) needed to copy the data to kernel. Then we do
1165 * the copying without checking the user space area
1166 * (__copy_from_user()).
1168 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1171 * sk The sk of the socket
1172 * addrs The pointer to the addresses in user land
1173 * addrssize Size of the addrs buffer
1175 * Returns 0 if ok, <0 errno code on error.
1177 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1178 struct sockaddr __user *addrs,
1182 struct sockaddr *kaddrs;
1184 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1185 __FUNCTION__, sk, addrs, addrs_size);
1187 if (unlikely(addrs_size <= 0))
1190 /* Check the user passed a healthy pointer. */
1191 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1194 /* Alloc space for the address array in kernel memory. */
1195 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1196 if (unlikely(!kaddrs))
1199 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1202 err = __sctp_connect(sk, kaddrs, addrs_size);
1209 /* API 3.1.4 close() - UDP Style Syntax
1210 * Applications use close() to perform graceful shutdown (as described in
1211 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1212 * by a UDP-style socket.
1216 * ret = close(int sd);
1218 * sd - the socket descriptor of the associations to be closed.
1220 * To gracefully shutdown a specific association represented by the
1221 * UDP-style socket, an application should use the sendmsg() call,
1222 * passing no user data, but including the appropriate flag in the
1223 * ancillary data (see Section xxxx).
1225 * If sd in the close() call is a branched-off socket representing only
1226 * one association, the shutdown is performed on that association only.
1228 * 4.1.6 close() - TCP Style Syntax
1230 * Applications use close() to gracefully close down an association.
1234 * int close(int sd);
1236 * sd - the socket descriptor of the association to be closed.
1238 * After an application calls close() on a socket descriptor, no further
1239 * socket operations will succeed on that descriptor.
1241 * API 7.1.4 SO_LINGER
1243 * An application using the TCP-style socket can use this option to
1244 * perform the SCTP ABORT primitive. The linger option structure is:
1247 * int l_onoff; // option on/off
1248 * int l_linger; // linger time
1251 * To enable the option, set l_onoff to 1. If the l_linger value is set
1252 * to 0, calling close() is the same as the ABORT primitive. If the
1253 * value is set to a negative value, the setsockopt() call will return
1254 * an error. If the value is set to a positive value linger_time, the
1255 * close() can be blocked for at most linger_time ms. If the graceful
1256 * shutdown phase does not finish during this period, close() will
1257 * return but the graceful shutdown phase continues in the system.
1259 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1261 struct sctp_endpoint *ep;
1262 struct sctp_association *asoc;
1263 struct list_head *pos, *temp;
1265 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1268 sk->sk_shutdown = SHUTDOWN_MASK;
1270 ep = sctp_sk(sk)->ep;
1272 /* Walk all associations on an endpoint. */
1273 list_for_each_safe(pos, temp, &ep->asocs) {
1274 asoc = list_entry(pos, struct sctp_association, asocs);
1276 if (sctp_style(sk, TCP)) {
1277 /* A closed association can still be in the list if
1278 * it belongs to a TCP-style listening socket that is
1279 * not yet accepted. If so, free it. If not, send an
1280 * ABORT or SHUTDOWN based on the linger options.
1282 if (sctp_state(asoc, CLOSED)) {
1283 sctp_unhash_established(asoc);
1284 sctp_association_free(asoc);
1289 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1290 struct sctp_chunk *chunk;
1292 chunk = sctp_make_abort_user(asoc, NULL, 0);
1294 sctp_primitive_ABORT(asoc, chunk);
1296 sctp_primitive_SHUTDOWN(asoc, NULL);
1299 /* Clean up any skbs sitting on the receive queue. */
1300 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1301 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1303 /* On a TCP-style socket, block for at most linger_time if set. */
1304 if (sctp_style(sk, TCP) && timeout)
1305 sctp_wait_for_close(sk, timeout);
1307 /* This will run the backlog queue. */
1308 sctp_release_sock(sk);
1310 /* Supposedly, no process has access to the socket, but
1311 * the net layers still may.
1313 sctp_local_bh_disable();
1314 sctp_bh_lock_sock(sk);
1316 /* Hold the sock, since sk_common_release() will put sock_put()
1317 * and we have just a little more cleanup.
1320 sk_common_release(sk);
1322 sctp_bh_unlock_sock(sk);
1323 sctp_local_bh_enable();
1327 SCTP_DBG_OBJCNT_DEC(sock);
1330 /* Handle EPIPE error. */
1331 static int sctp_error(struct sock *sk, int flags, int err)
1334 err = sock_error(sk) ? : -EPIPE;
1335 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1336 send_sig(SIGPIPE, current, 0);
1340 /* API 3.1.3 sendmsg() - UDP Style Syntax
1342 * An application uses sendmsg() and recvmsg() calls to transmit data to
1343 * and receive data from its peer.
1345 * ssize_t sendmsg(int socket, const struct msghdr *message,
1348 * socket - the socket descriptor of the endpoint.
1349 * message - pointer to the msghdr structure which contains a single
1350 * user message and possibly some ancillary data.
1352 * See Section 5 for complete description of the data
1355 * flags - flags sent or received with the user message, see Section
1356 * 5 for complete description of the flags.
1358 * Note: This function could use a rewrite especially when explicit
1359 * connect support comes in.
1361 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1363 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1365 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1366 struct msghdr *msg, size_t msg_len)
1368 struct sctp_sock *sp;
1369 struct sctp_endpoint *ep;
1370 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1371 struct sctp_transport *transport, *chunk_tp;
1372 struct sctp_chunk *chunk;
1374 struct sockaddr *msg_name = NULL;
1375 struct sctp_sndrcvinfo default_sinfo = { 0 };
1376 struct sctp_sndrcvinfo *sinfo;
1377 struct sctp_initmsg *sinit;
1378 sctp_assoc_t associd = 0;
1379 sctp_cmsgs_t cmsgs = { NULL };
1383 __u16 sinfo_flags = 0;
1384 struct sctp_datamsg *datamsg;
1385 struct list_head *pos;
1386 int msg_flags = msg->msg_flags;
1388 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1395 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1397 /* We cannot send a message over a TCP-style listening socket. */
1398 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1403 /* Parse out the SCTP CMSGs. */
1404 err = sctp_msghdr_parse(msg, &cmsgs);
1407 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1411 /* Fetch the destination address for this packet. This
1412 * address only selects the association--it is not necessarily
1413 * the address we will send to.
1414 * For a peeled-off socket, msg_name is ignored.
1416 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1417 int msg_namelen = msg->msg_namelen;
1419 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1424 if (msg_namelen > sizeof(to))
1425 msg_namelen = sizeof(to);
1426 memcpy(&to, msg->msg_name, msg_namelen);
1427 SCTP_DEBUG_PRINTK("Just memcpy'd. msg_name is "
1429 to.v4.sin_addr.s_addr, to.v4.sin_port);
1431 to.v4.sin_port = ntohs(to.v4.sin_port);
1432 msg_name = msg->msg_name;
1438 /* Did the user specify SNDRCVINFO? */
1440 sinfo_flags = sinfo->sinfo_flags;
1441 associd = sinfo->sinfo_assoc_id;
1444 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1445 msg_len, sinfo_flags);
1447 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1448 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1453 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1454 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1455 * If SCTP_ABORT is set, the message length could be non zero with
1456 * the msg_iov set to the user abort reason.
1458 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1459 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1464 /* If SCTP_ADDR_OVER is set, there must be an address
1465 * specified in msg_name.
1467 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1474 SCTP_DEBUG_PRINTK("About to look up association.\n");
1478 /* If a msg_name has been specified, assume this is to be used. */
1480 /* Look for a matching association on the endpoint. */
1481 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1483 /* If we could not find a matching association on the
1484 * endpoint, make sure that it is not a TCP-style
1485 * socket that already has an association or there is
1486 * no peeled-off association on another socket.
1488 if ((sctp_style(sk, TCP) &&
1489 sctp_sstate(sk, ESTABLISHED)) ||
1490 sctp_endpoint_is_peeled_off(ep, &to)) {
1491 err = -EADDRNOTAVAIL;
1496 asoc = sctp_id2assoc(sk, associd);
1504 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1506 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1507 * socket that has an association in CLOSED state. This can
1508 * happen when an accepted socket has an association that is
1511 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1516 if (sinfo_flags & SCTP_EOF) {
1517 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1519 sctp_primitive_SHUTDOWN(asoc, NULL);
1523 if (sinfo_flags & SCTP_ABORT) {
1524 struct sctp_chunk *chunk;
1526 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1532 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1533 sctp_primitive_ABORT(asoc, chunk);
1539 /* Do we need to create the association? */
1541 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1543 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1548 /* Check for invalid stream against the stream counts,
1549 * either the default or the user specified stream counts.
1552 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1553 /* Check against the defaults. */
1554 if (sinfo->sinfo_stream >=
1555 sp->initmsg.sinit_num_ostreams) {
1560 /* Check against the requested. */
1561 if (sinfo->sinfo_stream >=
1562 sinit->sinit_num_ostreams) {
1570 * API 3.1.2 bind() - UDP Style Syntax
1571 * If a bind() or sctp_bindx() is not called prior to a
1572 * sendmsg() call that initiates a new association, the
1573 * system picks an ephemeral port and will choose an address
1574 * set equivalent to binding with a wildcard address.
1576 if (!ep->base.bind_addr.port) {
1577 if (sctp_autobind(sk)) {
1583 * If an unprivileged user inherits a one-to-many
1584 * style socket with open associations on a privileged
1585 * port, it MAY be permitted to accept new associations,
1586 * but it SHOULD NOT be permitted to open new
1589 if (ep->base.bind_addr.port < PROT_SOCK &&
1590 !capable(CAP_NET_BIND_SERVICE)) {
1596 scope = sctp_scope(&to);
1597 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1604 /* If the SCTP_INIT ancillary data is specified, set all
1605 * the association init values accordingly.
1608 if (sinit->sinit_num_ostreams) {
1609 asoc->c.sinit_num_ostreams =
1610 sinit->sinit_num_ostreams;
1612 if (sinit->sinit_max_instreams) {
1613 asoc->c.sinit_max_instreams =
1614 sinit->sinit_max_instreams;
1616 if (sinit->sinit_max_attempts) {
1617 asoc->max_init_attempts
1618 = sinit->sinit_max_attempts;
1620 if (sinit->sinit_max_init_timeo) {
1621 asoc->max_init_timeo =
1622 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1626 /* Prime the peer's transport structures. */
1627 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1632 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1639 /* ASSERT: we have a valid association at this point. */
1640 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1643 /* If the user didn't specify SNDRCVINFO, make up one with
1646 default_sinfo.sinfo_stream = asoc->default_stream;
1647 default_sinfo.sinfo_flags = asoc->default_flags;
1648 default_sinfo.sinfo_ppid = asoc->default_ppid;
1649 default_sinfo.sinfo_context = asoc->default_context;
1650 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1651 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1652 sinfo = &default_sinfo;
1655 /* API 7.1.7, the sndbuf size per association bounds the
1656 * maximum size of data that can be sent in a single send call.
1658 if (msg_len > sk->sk_sndbuf) {
1663 /* If fragmentation is disabled and the message length exceeds the
1664 * association fragmentation point, return EMSGSIZE. The I-D
1665 * does not specify what this error is, but this looks like
1668 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1674 /* Check for invalid stream. */
1675 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1681 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1682 if (!sctp_wspace(asoc)) {
1683 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1688 /* If an address is passed with the sendto/sendmsg call, it is used
1689 * to override the primary destination address in the TCP model, or
1690 * when SCTP_ADDR_OVER flag is set in the UDP model.
1692 if ((sctp_style(sk, TCP) && msg_name) ||
1693 (sinfo_flags & SCTP_ADDR_OVER)) {
1694 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1702 /* Auto-connect, if we aren't connected already. */
1703 if (sctp_state(asoc, CLOSED)) {
1704 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1707 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1710 /* Break the message into multiple chunks of maximum size. */
1711 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1717 /* Now send the (possibly) fragmented message. */
1718 list_for_each(pos, &datamsg->chunks) {
1719 chunk = list_entry(pos, struct sctp_chunk, frag_list);
1720 sctp_datamsg_track(chunk);
1722 /* Do accounting for the write space. */
1723 sctp_set_owner_w(chunk);
1725 chunk->transport = chunk_tp;
1727 /* Send it to the lower layers. Note: all chunks
1728 * must either fail or succeed. The lower layer
1729 * works that way today. Keep it that way or this
1732 err = sctp_primitive_SEND(asoc, chunk);
1733 /* Did the lower layer accept the chunk? */
1735 sctp_chunk_free(chunk);
1736 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1739 sctp_datamsg_free(datamsg);
1745 /* If we are already past ASSOCIATE, the lower
1746 * layers are responsible for association cleanup.
1752 sctp_association_free(asoc);
1754 sctp_release_sock(sk);
1757 return sctp_error(sk, msg_flags, err);
1764 err = sock_error(sk);
1774 /* This is an extended version of skb_pull() that removes the data from the
1775 * start of a skb even when data is spread across the list of skb's in the
1776 * frag_list. len specifies the total amount of data that needs to be removed.
1777 * when 'len' bytes could be removed from the skb, it returns 0.
1778 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1779 * could not be removed.
1781 static int sctp_skb_pull(struct sk_buff *skb, int len)
1783 struct sk_buff *list;
1784 int skb_len = skb_headlen(skb);
1787 if (len <= skb_len) {
1788 __skb_pull(skb, len);
1792 __skb_pull(skb, skb_len);
1794 for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
1795 rlen = sctp_skb_pull(list, len);
1796 skb->len -= (len-rlen);
1797 skb->data_len -= (len-rlen);
1808 /* API 3.1.3 recvmsg() - UDP Style Syntax
1810 * ssize_t recvmsg(int socket, struct msghdr *message,
1813 * socket - the socket descriptor of the endpoint.
1814 * message - pointer to the msghdr structure which contains a single
1815 * user message and possibly some ancillary data.
1817 * See Section 5 for complete description of the data
1820 * flags - flags sent or received with the user message, see Section
1821 * 5 for complete description of the flags.
1823 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1825 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1826 struct msghdr *msg, size_t len, int noblock,
1827 int flags, int *addr_len)
1829 struct sctp_ulpevent *event = NULL;
1830 struct sctp_sock *sp = sctp_sk(sk);
1831 struct sk_buff *skb;
1836 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1837 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1838 "len", len, "knoblauch", noblock,
1839 "flags", flags, "addr_len", addr_len);
1843 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1848 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1852 /* Get the total length of the skb including any skb's in the
1861 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1863 event = sctp_skb2event(skb);
1868 sock_recv_timestamp(msg, sk, skb);
1869 if (sctp_ulpevent_is_notification(event)) {
1870 msg->msg_flags |= MSG_NOTIFICATION;
1871 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1873 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1876 /* Check if we allow SCTP_SNDRCVINFO. */
1877 if (sp->subscribe.sctp_data_io_event)
1878 sctp_ulpevent_read_sndrcvinfo(event, msg);
1880 /* FIXME: we should be calling IP/IPv6 layers. */
1881 if (sk->sk_protinfo.af_inet.cmsg_flags)
1882 ip_cmsg_recv(msg, skb);
1887 /* If skb's length exceeds the user's buffer, update the skb and
1888 * push it back to the receive_queue so that the next call to
1889 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1891 if (skb_len > copied) {
1892 msg->msg_flags &= ~MSG_EOR;
1893 if (flags & MSG_PEEK)
1895 sctp_skb_pull(skb, copied);
1896 skb_queue_head(&sk->sk_receive_queue, skb);
1898 /* When only partial message is copied to the user, increase
1899 * rwnd by that amount. If all the data in the skb is read,
1900 * rwnd is updated when the event is freed.
1902 sctp_assoc_rwnd_increase(event->asoc, copied);
1904 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
1905 (event->msg_flags & MSG_EOR))
1906 msg->msg_flags |= MSG_EOR;
1908 msg->msg_flags &= ~MSG_EOR;
1911 if (flags & MSG_PEEK) {
1912 /* Release the skb reference acquired after peeking the skb in
1913 * sctp_skb_recv_datagram().
1917 /* Free the event which includes releasing the reference to
1918 * the owner of the skb, freeing the skb and updating the
1921 sctp_ulpevent_free(event);
1924 sctp_release_sock(sk);
1928 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1930 * This option is a on/off flag. If enabled no SCTP message
1931 * fragmentation will be performed. Instead if a message being sent
1932 * exceeds the current PMTU size, the message will NOT be sent and
1933 * instead a error will be indicated to the user.
1935 static int sctp_setsockopt_disable_fragments(struct sock *sk,
1936 char __user *optval, int optlen)
1940 if (optlen < sizeof(int))
1943 if (get_user(val, (int __user *)optval))
1946 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
1951 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
1954 if (optlen != sizeof(struct sctp_event_subscribe))
1956 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
1961 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
1963 * This socket option is applicable to the UDP-style socket only. When
1964 * set it will cause associations that are idle for more than the
1965 * specified number of seconds to automatically close. An association
1966 * being idle is defined an association that has NOT sent or received
1967 * user data. The special value of '0' indicates that no automatic
1968 * close of any associations should be performed. The option expects an
1969 * integer defining the number of seconds of idle time before an
1970 * association is closed.
1972 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
1975 struct sctp_sock *sp = sctp_sk(sk);
1977 /* Applicable to UDP-style socket only */
1978 if (sctp_style(sk, TCP))
1980 if (optlen != sizeof(int))
1982 if (copy_from_user(&sp->autoclose, optval, optlen))
1988 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
1990 * Applications can enable or disable heartbeats for any peer address of
1991 * an association, modify an address's heartbeat interval, force a
1992 * heartbeat to be sent immediately, and adjust the address's maximum
1993 * number of retransmissions sent before an address is considered
1994 * unreachable. The following structure is used to access and modify an
1995 * address's parameters:
1997 * struct sctp_paddrparams {
1998 * sctp_assoc_t spp_assoc_id;
1999 * struct sockaddr_storage spp_address;
2000 * uint32_t spp_hbinterval;
2001 * uint16_t spp_pathmaxrxt;
2002 * uint32_t spp_pathmtu;
2003 * uint32_t spp_sackdelay;
2004 * uint32_t spp_flags;
2007 * spp_assoc_id - (one-to-many style socket) This is filled in the
2008 * application, and identifies the association for
2010 * spp_address - This specifies which address is of interest.
2011 * spp_hbinterval - This contains the value of the heartbeat interval,
2012 * in milliseconds. If a value of zero
2013 * is present in this field then no changes are to
2014 * be made to this parameter.
2015 * spp_pathmaxrxt - This contains the maximum number of
2016 * retransmissions before this address shall be
2017 * considered unreachable. If a value of zero
2018 * is present in this field then no changes are to
2019 * be made to this parameter.
2020 * spp_pathmtu - When Path MTU discovery is disabled the value
2021 * specified here will be the "fixed" path mtu.
2022 * Note that if the spp_address field is empty
2023 * then all associations on this address will
2024 * have this fixed path mtu set upon them.
2026 * spp_sackdelay - When delayed sack is enabled, this value specifies
2027 * the number of milliseconds that sacks will be delayed
2028 * for. This value will apply to all addresses of an
2029 * association if the spp_address field is empty. Note
2030 * also, that if delayed sack is enabled and this
2031 * value is set to 0, no change is made to the last
2032 * recorded delayed sack timer value.
2034 * spp_flags - These flags are used to control various features
2035 * on an association. The flag field may contain
2036 * zero or more of the following options.
2038 * SPP_HB_ENABLE - Enable heartbeats on the
2039 * specified address. Note that if the address
2040 * field is empty all addresses for the association
2041 * have heartbeats enabled upon them.
2043 * SPP_HB_DISABLE - Disable heartbeats on the
2044 * speicifed address. Note that if the address
2045 * field is empty all addresses for the association
2046 * will have their heartbeats disabled. Note also
2047 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2048 * mutually exclusive, only one of these two should
2049 * be specified. Enabling both fields will have
2050 * undetermined results.
2052 * SPP_HB_DEMAND - Request a user initiated heartbeat
2053 * to be made immediately.
2055 * SPP_PMTUD_ENABLE - This field will enable PMTU
2056 * discovery upon the specified address. Note that
2057 * if the address feild is empty then all addresses
2058 * on the association are effected.
2060 * SPP_PMTUD_DISABLE - This field will disable PMTU
2061 * discovery upon the specified address. Note that
2062 * if the address feild is empty then all addresses
2063 * on the association are effected. Not also that
2064 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2065 * exclusive. Enabling both will have undetermined
2068 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2069 * on delayed sack. The time specified in spp_sackdelay
2070 * is used to specify the sack delay for this address. Note
2071 * that if spp_address is empty then all addresses will
2072 * enable delayed sack and take on the sack delay
2073 * value specified in spp_sackdelay.
2074 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2075 * off delayed sack. If the spp_address field is blank then
2076 * delayed sack is disabled for the entire association. Note
2077 * also that this field is mutually exclusive to
2078 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2081 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2082 struct sctp_transport *trans,
2083 struct sctp_association *asoc,
2084 struct sctp_sock *sp,
2087 int sackdelay_change)
2091 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2092 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2097 if (params->spp_hbinterval) {
2099 trans->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
2101 asoc->hbinterval = msecs_to_jiffies(params->spp_hbinterval);
2103 sp->hbinterval = params->spp_hbinterval;
2109 trans->param_flags =
2110 (trans->param_flags & ~SPP_HB) | hb_change;
2113 (asoc->param_flags & ~SPP_HB) | hb_change;
2116 (sp->param_flags & ~SPP_HB) | hb_change;
2120 if (params->spp_pathmtu) {
2122 trans->pathmtu = params->spp_pathmtu;
2123 sctp_assoc_sync_pmtu(asoc);
2125 asoc->pathmtu = params->spp_pathmtu;
2126 sctp_frag_point(sp, params->spp_pathmtu);
2128 sp->pathmtu = params->spp_pathmtu;
2134 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2135 (params->spp_flags & SPP_PMTUD_ENABLE);
2136 trans->param_flags =
2137 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2139 sctp_transport_pmtu(trans);
2140 sctp_assoc_sync_pmtu(asoc);
2144 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2147 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2151 if (params->spp_sackdelay) {
2154 msecs_to_jiffies(params->spp_sackdelay);
2157 msecs_to_jiffies(params->spp_sackdelay);
2159 sp->sackdelay = params->spp_sackdelay;
2163 if (sackdelay_change) {
2165 trans->param_flags =
2166 (trans->param_flags & ~SPP_SACKDELAY) |
2170 (asoc->param_flags & ~SPP_SACKDELAY) |
2174 (sp->param_flags & ~SPP_SACKDELAY) |
2179 if (params->spp_pathmaxrxt) {
2181 trans->pathmaxrxt = params->spp_pathmaxrxt;
2183 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2185 sp->pathmaxrxt = params->spp_pathmaxrxt;
2192 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2193 char __user *optval, int optlen)
2195 struct sctp_paddrparams params;
2196 struct sctp_transport *trans = NULL;
2197 struct sctp_association *asoc = NULL;
2198 struct sctp_sock *sp = sctp_sk(sk);
2200 int hb_change, pmtud_change, sackdelay_change;
2202 if (optlen != sizeof(struct sctp_paddrparams))
2205 if (copy_from_user(¶ms, optval, optlen))
2208 /* Validate flags and value parameters. */
2209 hb_change = params.spp_flags & SPP_HB;
2210 pmtud_change = params.spp_flags & SPP_PMTUD;
2211 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2213 if (hb_change == SPP_HB ||
2214 pmtud_change == SPP_PMTUD ||
2215 sackdelay_change == SPP_SACKDELAY ||
2216 params.spp_sackdelay > 500 ||
2218 && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2221 /* If an address other than INADDR_ANY is specified, and
2222 * no transport is found, then the request is invalid.
2224 if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
2225 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2226 params.spp_assoc_id);
2231 /* Get association, if assoc_id != 0 and the socket is a one
2232 * to many style socket, and an association was not found, then
2233 * the id was invalid.
2235 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2236 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2239 /* Heartbeat demand can only be sent on a transport or
2240 * association, but not a socket.
2242 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2245 /* Process parameters. */
2246 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2247 hb_change, pmtud_change,
2253 /* If changes are for association, also apply parameters to each
2256 if (!trans && asoc) {
2257 struct list_head *pos;
2259 list_for_each(pos, &asoc->peer.transport_addr_list) {
2260 trans = list_entry(pos, struct sctp_transport,
2262 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2263 hb_change, pmtud_change,
2271 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
2273 * This options will get or set the delayed ack timer. The time is set
2274 * in milliseconds. If the assoc_id is 0, then this sets or gets the
2275 * endpoints default delayed ack timer value. If the assoc_id field is
2276 * non-zero, then the set or get effects the specified association.
2278 * struct sctp_assoc_value {
2279 * sctp_assoc_t assoc_id;
2280 * uint32_t assoc_value;
2283 * assoc_id - This parameter, indicates which association the
2284 * user is preforming an action upon. Note that if
2285 * this field's value is zero then the endpoints
2286 * default value is changed (effecting future
2287 * associations only).
2289 * assoc_value - This parameter contains the number of milliseconds
2290 * that the user is requesting the delayed ACK timer
2291 * be set to. Note that this value is defined in
2292 * the standard to be between 200 and 500 milliseconds.
2294 * Note: a value of zero will leave the value alone,
2295 * but disable SACK delay. A non-zero value will also
2296 * enable SACK delay.
2299 static int sctp_setsockopt_delayed_ack_time(struct sock *sk,
2300 char __user *optval, int optlen)
2302 struct sctp_assoc_value params;
2303 struct sctp_transport *trans = NULL;
2304 struct sctp_association *asoc = NULL;
2305 struct sctp_sock *sp = sctp_sk(sk);
2307 if (optlen != sizeof(struct sctp_assoc_value))
2310 if (copy_from_user(¶ms, optval, optlen))
2313 /* Validate value parameter. */
2314 if (params.assoc_value > 500)
2317 /* Get association, if assoc_id != 0 and the socket is a one
2318 * to many style socket, and an association was not found, then
2319 * the id was invalid.
2321 asoc = sctp_id2assoc(sk, params.assoc_id);
2322 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2325 if (params.assoc_value) {
2328 msecs_to_jiffies(params.assoc_value);
2330 (asoc->param_flags & ~SPP_SACKDELAY) |
2331 SPP_SACKDELAY_ENABLE;
2333 sp->sackdelay = params.assoc_value;
2335 (sp->param_flags & ~SPP_SACKDELAY) |
2336 SPP_SACKDELAY_ENABLE;
2341 (asoc->param_flags & ~SPP_SACKDELAY) |
2342 SPP_SACKDELAY_DISABLE;
2345 (sp->param_flags & ~SPP_SACKDELAY) |
2346 SPP_SACKDELAY_DISABLE;
2350 /* If change is for association, also apply to each transport. */
2352 struct list_head *pos;
2354 list_for_each(pos, &asoc->peer.transport_addr_list) {
2355 trans = list_entry(pos, struct sctp_transport,
2357 if (params.assoc_value) {
2359 msecs_to_jiffies(params.assoc_value);
2360 trans->param_flags =
2361 (trans->param_flags & ~SPP_SACKDELAY) |
2362 SPP_SACKDELAY_ENABLE;
2364 trans->param_flags =
2365 (trans->param_flags & ~SPP_SACKDELAY) |
2366 SPP_SACKDELAY_DISABLE;
2374 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2376 * Applications can specify protocol parameters for the default association
2377 * initialization. The option name argument to setsockopt() and getsockopt()
2380 * Setting initialization parameters is effective only on an unconnected
2381 * socket (for UDP-style sockets only future associations are effected
2382 * by the change). With TCP-style sockets, this option is inherited by
2383 * sockets derived from a listener socket.
2385 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, int optlen)
2387 struct sctp_initmsg sinit;
2388 struct sctp_sock *sp = sctp_sk(sk);
2390 if (optlen != sizeof(struct sctp_initmsg))
2392 if (copy_from_user(&sinit, optval, optlen))
2395 if (sinit.sinit_num_ostreams)
2396 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2397 if (sinit.sinit_max_instreams)
2398 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2399 if (sinit.sinit_max_attempts)
2400 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2401 if (sinit.sinit_max_init_timeo)
2402 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2408 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2410 * Applications that wish to use the sendto() system call may wish to
2411 * specify a default set of parameters that would normally be supplied
2412 * through the inclusion of ancillary data. This socket option allows
2413 * such an application to set the default sctp_sndrcvinfo structure.
2414 * The application that wishes to use this socket option simply passes
2415 * in to this call the sctp_sndrcvinfo structure defined in Section
2416 * 5.2.2) The input parameters accepted by this call include
2417 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2418 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2419 * to this call if the caller is using the UDP model.
2421 static int sctp_setsockopt_default_send_param(struct sock *sk,
2422 char __user *optval, int optlen)
2424 struct sctp_sndrcvinfo info;
2425 struct sctp_association *asoc;
2426 struct sctp_sock *sp = sctp_sk(sk);
2428 if (optlen != sizeof(struct sctp_sndrcvinfo))
2430 if (copy_from_user(&info, optval, optlen))
2433 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2434 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2438 asoc->default_stream = info.sinfo_stream;
2439 asoc->default_flags = info.sinfo_flags;
2440 asoc->default_ppid = info.sinfo_ppid;
2441 asoc->default_context = info.sinfo_context;
2442 asoc->default_timetolive = info.sinfo_timetolive;
2444 sp->default_stream = info.sinfo_stream;
2445 sp->default_flags = info.sinfo_flags;
2446 sp->default_ppid = info.sinfo_ppid;
2447 sp->default_context = info.sinfo_context;
2448 sp->default_timetolive = info.sinfo_timetolive;
2454 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2456 * Requests that the local SCTP stack use the enclosed peer address as
2457 * the association primary. The enclosed address must be one of the
2458 * association peer's addresses.
2460 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2463 struct sctp_prim prim;
2464 struct sctp_transport *trans;
2466 if (optlen != sizeof(struct sctp_prim))
2469 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2472 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2476 sctp_assoc_set_primary(trans->asoc, trans);
2482 * 7.1.5 SCTP_NODELAY
2484 * Turn on/off any Nagle-like algorithm. This means that packets are
2485 * generally sent as soon as possible and no unnecessary delays are
2486 * introduced, at the cost of more packets in the network. Expects an
2487 * integer boolean flag.
2489 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2494 if (optlen < sizeof(int))
2496 if (get_user(val, (int __user *)optval))
2499 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2505 * 7.1.1 SCTP_RTOINFO
2507 * The protocol parameters used to initialize and bound retransmission
2508 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2509 * and modify these parameters.
2510 * All parameters are time values, in milliseconds. A value of 0, when
2511 * modifying the parameters, indicates that the current value should not
2515 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, int optlen) {
2516 struct sctp_rtoinfo rtoinfo;
2517 struct sctp_association *asoc;
2519 if (optlen != sizeof (struct sctp_rtoinfo))
2522 if (copy_from_user(&rtoinfo, optval, optlen))
2525 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2527 /* Set the values to the specific association */
2528 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2532 if (rtoinfo.srto_initial != 0)
2534 msecs_to_jiffies(rtoinfo.srto_initial);
2535 if (rtoinfo.srto_max != 0)
2536 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2537 if (rtoinfo.srto_min != 0)
2538 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2540 /* If there is no association or the association-id = 0
2541 * set the values to the endpoint.
2543 struct sctp_sock *sp = sctp_sk(sk);
2545 if (rtoinfo.srto_initial != 0)
2546 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2547 if (rtoinfo.srto_max != 0)
2548 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2549 if (rtoinfo.srto_min != 0)
2550 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2558 * 7.1.2 SCTP_ASSOCINFO
2560 * This option is used to tune the the maximum retransmission attempts
2561 * of the association.
2562 * Returns an error if the new association retransmission value is
2563 * greater than the sum of the retransmission value of the peer.
2564 * See [SCTP] for more information.
2567 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int optlen)
2570 struct sctp_assocparams assocparams;
2571 struct sctp_association *asoc;
2573 if (optlen != sizeof(struct sctp_assocparams))
2575 if (copy_from_user(&assocparams, optval, optlen))
2578 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2580 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2583 /* Set the values to the specific association */
2585 if (assocparams.sasoc_asocmaxrxt != 0) {
2588 struct list_head *pos;
2589 struct sctp_transport *peer_addr;
2591 list_for_each(pos, &asoc->peer.transport_addr_list) {
2592 peer_addr = list_entry(pos,
2593 struct sctp_transport,
2595 path_sum += peer_addr->pathmaxrxt;
2599 /* Only validate asocmaxrxt if we have more then
2600 * one path/transport. We do this because path
2601 * retransmissions are only counted when we have more
2605 assocparams.sasoc_asocmaxrxt > path_sum)
2608 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2611 if (assocparams.sasoc_cookie_life != 0) {
2612 asoc->cookie_life.tv_sec =
2613 assocparams.sasoc_cookie_life / 1000;
2614 asoc->cookie_life.tv_usec =
2615 (assocparams.sasoc_cookie_life % 1000)
2619 /* Set the values to the endpoint */
2620 struct sctp_sock *sp = sctp_sk(sk);
2622 if (assocparams.sasoc_asocmaxrxt != 0)
2623 sp->assocparams.sasoc_asocmaxrxt =
2624 assocparams.sasoc_asocmaxrxt;
2625 if (assocparams.sasoc_cookie_life != 0)
2626 sp->assocparams.sasoc_cookie_life =
2627 assocparams.sasoc_cookie_life;
2633 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2635 * This socket option is a boolean flag which turns on or off mapped V4
2636 * addresses. If this option is turned on and the socket is type
2637 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2638 * If this option is turned off, then no mapping will be done of V4
2639 * addresses and a user will receive both PF_INET6 and PF_INET type
2640 * addresses on the socket.
2642 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, int optlen)
2645 struct sctp_sock *sp = sctp_sk(sk);
2647 if (optlen < sizeof(int))
2649 if (get_user(val, (int __user *)optval))
2660 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2662 * This socket option specifies the maximum size to put in any outgoing
2663 * SCTP chunk. If a message is larger than this size it will be
2664 * fragmented by SCTP into the specified size. Note that the underlying
2665 * SCTP implementation may fragment into smaller sized chunks when the
2666 * PMTU of the underlying association is smaller than the value set by
2669 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optlen)
2671 struct sctp_association *asoc;
2672 struct list_head *pos;
2673 struct sctp_sock *sp = sctp_sk(sk);
2676 if (optlen < sizeof(int))
2678 if (get_user(val, (int __user *)optval))
2680 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2682 sp->user_frag = val;
2684 /* Update the frag_point of the existing associations. */
2685 list_for_each(pos, &(sp->ep->asocs)) {
2686 asoc = list_entry(pos, struct sctp_association, asocs);
2687 asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
2695 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2697 * Requests that the peer mark the enclosed address as the association
2698 * primary. The enclosed address must be one of the association's
2699 * locally bound addresses. The following structure is used to make a
2700 * set primary request:
2702 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2705 struct sctp_sock *sp;
2706 struct sctp_endpoint *ep;
2707 struct sctp_association *asoc = NULL;
2708 struct sctp_setpeerprim prim;
2709 struct sctp_chunk *chunk;
2715 if (!sctp_addip_enable)
2718 if (optlen != sizeof(struct sctp_setpeerprim))
2721 if (copy_from_user(&prim, optval, optlen))
2724 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2728 if (!asoc->peer.asconf_capable)
2731 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2734 if (!sctp_state(asoc, ESTABLISHED))
2737 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2738 return -EADDRNOTAVAIL;
2740 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2741 chunk = sctp_make_asconf_set_prim(asoc,
2742 (union sctp_addr *)&prim.sspp_addr);
2746 err = sctp_send_asconf(asoc, chunk);
2748 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2753 static int sctp_setsockopt_adaption_layer(struct sock *sk, char __user *optval,
2756 struct sctp_setadaption adaption;
2758 if (optlen != sizeof(struct sctp_setadaption))
2760 if (copy_from_user(&adaption, optval, optlen))
2763 sctp_sk(sk)->adaption_ind = adaption.ssb_adaption_ind;
2768 /* API 6.2 setsockopt(), getsockopt()
2770 * Applications use setsockopt() and getsockopt() to set or retrieve
2771 * socket options. Socket options are used to change the default
2772 * behavior of sockets calls. They are described in Section 7.
2776 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
2777 * int __user *optlen);
2778 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
2781 * sd - the socket descript.
2782 * level - set to IPPROTO_SCTP for all SCTP options.
2783 * optname - the option name.
2784 * optval - the buffer to store the value of the option.
2785 * optlen - the size of the buffer.
2787 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
2788 char __user *optval, int optlen)
2792 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
2795 /* I can hardly begin to describe how wrong this is. This is
2796 * so broken as to be worse than useless. The API draft
2797 * REALLY is NOT helpful here... I am not convinced that the
2798 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
2799 * are at all well-founded.
2801 if (level != SOL_SCTP) {
2802 struct sctp_af *af = sctp_sk(sk)->pf->af;
2803 retval = af->setsockopt(sk, level, optname, optval, optlen);
2810 case SCTP_SOCKOPT_BINDX_ADD:
2811 /* 'optlen' is the size of the addresses buffer. */
2812 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
2813 optlen, SCTP_BINDX_ADD_ADDR);
2816 case SCTP_SOCKOPT_BINDX_REM:
2817 /* 'optlen' is the size of the addresses buffer. */
2818 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
2819 optlen, SCTP_BINDX_REM_ADDR);
2822 case SCTP_SOCKOPT_CONNECTX:
2823 /* 'optlen' is the size of the addresses buffer. */
2824 retval = sctp_setsockopt_connectx(sk, (struct sockaddr __user *)optval,
2828 case SCTP_DISABLE_FRAGMENTS:
2829 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
2833 retval = sctp_setsockopt_events(sk, optval, optlen);
2836 case SCTP_AUTOCLOSE:
2837 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
2840 case SCTP_PEER_ADDR_PARAMS:
2841 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
2844 case SCTP_DELAYED_ACK_TIME:
2845 retval = sctp_setsockopt_delayed_ack_time(sk, optval, optlen);
2849 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
2851 case SCTP_DEFAULT_SEND_PARAM:
2852 retval = sctp_setsockopt_default_send_param(sk, optval,
2855 case SCTP_PRIMARY_ADDR:
2856 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
2858 case SCTP_SET_PEER_PRIMARY_ADDR:
2859 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
2862 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
2865 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
2867 case SCTP_ASSOCINFO:
2868 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
2870 case SCTP_I_WANT_MAPPED_V4_ADDR:
2871 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
2874 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
2876 case SCTP_ADAPTION_LAYER:
2877 retval = sctp_setsockopt_adaption_layer(sk, optval, optlen);
2881 retval = -ENOPROTOOPT;
2885 sctp_release_sock(sk);
2891 /* API 3.1.6 connect() - UDP Style Syntax
2893 * An application may use the connect() call in the UDP model to initiate an
2894 * association without sending data.
2898 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
2900 * sd: the socket descriptor to have a new association added to.
2902 * nam: the address structure (either struct sockaddr_in or struct
2903 * sockaddr_in6 defined in RFC2553 [7]).
2905 * len: the size of the address.
2907 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
2915 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
2916 __FUNCTION__, sk, addr, addr_len);
2918 /* Validate addr_len before calling common connect/connectx routine. */
2919 af = sctp_get_af_specific(addr->sa_family);
2920 if (!af || addr_len < af->sockaddr_len) {
2923 /* Pass correct addr len to common routine (so it knows there
2924 * is only one address being passed.
2926 err = __sctp_connect(sk, addr, af->sockaddr_len);
2929 sctp_release_sock(sk);
2933 /* FIXME: Write comments. */
2934 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
2936 return -EOPNOTSUPP; /* STUB */
2939 /* 4.1.4 accept() - TCP Style Syntax
2941 * Applications use accept() call to remove an established SCTP
2942 * association from the accept queue of the endpoint. A new socket
2943 * descriptor will be returned from accept() to represent the newly
2944 * formed association.
2946 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
2948 struct sctp_sock *sp;
2949 struct sctp_endpoint *ep;
2950 struct sock *newsk = NULL;
2951 struct sctp_association *asoc;
2960 if (!sctp_style(sk, TCP)) {
2961 error = -EOPNOTSUPP;
2965 if (!sctp_sstate(sk, LISTENING)) {
2970 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2972 error = sctp_wait_for_accept(sk, timeo);
2976 /* We treat the list of associations on the endpoint as the accept
2977 * queue and pick the first association on the list.
2979 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
2981 newsk = sp->pf->create_accept_sk(sk, asoc);
2987 /* Populate the fields of the newsk from the oldsk and migrate the
2988 * asoc to the newsk.
2990 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
2993 sctp_release_sock(sk);
2998 /* The SCTP ioctl handler. */
2999 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3001 return -ENOIOCTLCMD;
3004 /* This is the function which gets called during socket creation to
3005 * initialized the SCTP-specific portion of the sock.
3006 * The sock structure should already be zero-filled memory.
3008 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3010 struct sctp_endpoint *ep;
3011 struct sctp_sock *sp;
3013 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3017 /* Initialize the SCTP per socket area. */
3018 switch (sk->sk_type) {
3019 case SOCK_SEQPACKET:
3020 sp->type = SCTP_SOCKET_UDP;
3023 sp->type = SCTP_SOCKET_TCP;
3026 return -ESOCKTNOSUPPORT;
3029 /* Initialize default send parameters. These parameters can be
3030 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3032 sp->default_stream = 0;
3033 sp->default_ppid = 0;
3034 sp->default_flags = 0;
3035 sp->default_context = 0;
3036 sp->default_timetolive = 0;
3038 /* Initialize default setup parameters. These parameters
3039 * can be modified with the SCTP_INITMSG socket option or
3040 * overridden by the SCTP_INIT CMSG.
3042 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3043 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3044 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3045 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3047 /* Initialize default RTO related parameters. These parameters can
3048 * be modified for with the SCTP_RTOINFO socket option.
3050 sp->rtoinfo.srto_initial = sctp_rto_initial;
3051 sp->rtoinfo.srto_max = sctp_rto_max;
3052 sp->rtoinfo.srto_min = sctp_rto_min;
3054 /* Initialize default association related parameters. These parameters
3055 * can be modified with the SCTP_ASSOCINFO socket option.
3057 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3058 sp->assocparams.sasoc_number_peer_destinations = 0;
3059 sp->assocparams.sasoc_peer_rwnd = 0;
3060 sp->assocparams.sasoc_local_rwnd = 0;
3061 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3063 /* Initialize default event subscriptions. By default, all the
3066 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3068 /* Default Peer Address Parameters. These defaults can
3069 * be modified via SCTP_PEER_ADDR_PARAMS
3071 sp->hbinterval = sctp_hb_interval;
3072 sp->pathmaxrxt = sctp_max_retrans_path;
3073 sp->pathmtu = 0; // allow default discovery
3074 sp->sackdelay = sctp_sack_timeout;
3075 sp->param_flags = SPP_HB_ENABLE |
3077 SPP_SACKDELAY_ENABLE;
3079 /* If enabled no SCTP message fragmentation will be performed.
3080 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3082 sp->disable_fragments = 0;
3084 /* Enable Nagle algorithm by default. */
3087 /* Enable by default. */
3090 /* Auto-close idle associations after the configured
3091 * number of seconds. A value of 0 disables this
3092 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3093 * for UDP-style sockets only.
3097 /* User specified fragmentation limit. */
3100 sp->adaption_ind = 0;
3102 sp->pf = sctp_get_pf_specific(sk->sk_family);
3104 /* Control variables for partial data delivery. */
3106 skb_queue_head_init(&sp->pd_lobby);
3108 /* Create a per socket endpoint structure. Even if we
3109 * change the data structure relationships, this may still
3110 * be useful for storing pre-connect address information.
3112 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3119 SCTP_DBG_OBJCNT_INC(sock);
3123 /* Cleanup any SCTP per socket resources. */
3124 SCTP_STATIC int sctp_destroy_sock(struct sock *sk)
3126 struct sctp_endpoint *ep;
3128 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3130 /* Release our hold on the endpoint. */
3131 ep = sctp_sk(sk)->ep;
3132 sctp_endpoint_free(ep);
3137 /* API 4.1.7 shutdown() - TCP Style Syntax
3138 * int shutdown(int socket, int how);
3140 * sd - the socket descriptor of the association to be closed.
3141 * how - Specifies the type of shutdown. The values are
3144 * Disables further receive operations. No SCTP
3145 * protocol action is taken.
3147 * Disables further send operations, and initiates
3148 * the SCTP shutdown sequence.
3150 * Disables further send and receive operations
3151 * and initiates the SCTP shutdown sequence.
3153 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3155 struct sctp_endpoint *ep;
3156 struct sctp_association *asoc;
3158 if (!sctp_style(sk, TCP))
3161 if (how & SEND_SHUTDOWN) {
3162 ep = sctp_sk(sk)->ep;
3163 if (!list_empty(&ep->asocs)) {
3164 asoc = list_entry(ep->asocs.next,
3165 struct sctp_association, asocs);
3166 sctp_primitive_SHUTDOWN(asoc, NULL);
3171 /* 7.2.1 Association Status (SCTP_STATUS)
3173 * Applications can retrieve current status information about an
3174 * association, including association state, peer receiver window size,
3175 * number of unacked data chunks, and number of data chunks pending
3176 * receipt. This information is read-only.
3178 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3179 char __user *optval,
3182 struct sctp_status status;
3183 struct sctp_association *asoc = NULL;
3184 struct sctp_transport *transport;
3185 sctp_assoc_t associd;
3188 if (len != sizeof(status)) {
3193 if (copy_from_user(&status, optval, sizeof(status))) {
3198 associd = status.sstat_assoc_id;
3199 asoc = sctp_id2assoc(sk, associd);
3205 transport = asoc->peer.primary_path;
3207 status.sstat_assoc_id = sctp_assoc2id(asoc);
3208 status.sstat_state = asoc->state;
3209 status.sstat_rwnd = asoc->peer.rwnd;
3210 status.sstat_unackdata = asoc->unack_data;
3212 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3213 status.sstat_instrms = asoc->c.sinit_max_instreams;
3214 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3215 status.sstat_fragmentation_point = asoc->frag_point;
3216 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3217 flip_to_n((union sctp_addr *)&status.sstat_primary.spinfo_address,
3218 &transport->ipaddr_h);
3219 /* Map ipv4 address into v4-mapped-on-v6 address. */
3220 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3221 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3222 status.sstat_primary.spinfo_state = transport->state;
3223 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3224 status.sstat_primary.spinfo_srtt = transport->srtt;
3225 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3226 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3228 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3229 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3231 if (put_user(len, optlen)) {
3236 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3237 len, status.sstat_state, status.sstat_rwnd,
3238 status.sstat_assoc_id);
3240 if (copy_to_user(optval, &status, len)) {
3250 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3252 * Applications can retrieve information about a specific peer address
3253 * of an association, including its reachability state, congestion
3254 * window, and retransmission timer values. This information is
3257 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3258 char __user *optval,
3261 struct sctp_paddrinfo pinfo;
3262 struct sctp_transport *transport;
3265 if (len != sizeof(pinfo)) {
3270 if (copy_from_user(&pinfo, optval, sizeof(pinfo))) {
3275 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3276 pinfo.spinfo_assoc_id);
3280 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3281 pinfo.spinfo_state = transport->state;
3282 pinfo.spinfo_cwnd = transport->cwnd;
3283 pinfo.spinfo_srtt = transport->srtt;
3284 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3285 pinfo.spinfo_mtu = transport->pathmtu;
3287 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3288 pinfo.spinfo_state = SCTP_ACTIVE;
3290 if (put_user(len, optlen)) {
3295 if (copy_to_user(optval, &pinfo, len)) {
3304 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3306 * This option is a on/off flag. If enabled no SCTP message
3307 * fragmentation will be performed. Instead if a message being sent
3308 * exceeds the current PMTU size, the message will NOT be sent and
3309 * instead a error will be indicated to the user.
3311 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3312 char __user *optval, int __user *optlen)
3316 if (len < sizeof(int))
3320 val = (sctp_sk(sk)->disable_fragments == 1);
3321 if (put_user(len, optlen))
3323 if (copy_to_user(optval, &val, len))
3328 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3330 * This socket option is used to specify various notifications and
3331 * ancillary data the user wishes to receive.
3333 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3336 if (len != sizeof(struct sctp_event_subscribe))
3338 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3343 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3345 * This socket option is applicable to the UDP-style socket only. When
3346 * set it will cause associations that are idle for more than the
3347 * specified number of seconds to automatically close. An association
3348 * being idle is defined an association that has NOT sent or received
3349 * user data. The special value of '0' indicates that no automatic
3350 * close of any associations should be performed. The option expects an
3351 * integer defining the number of seconds of idle time before an
3352 * association is closed.
3354 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3356 /* Applicable to UDP-style socket only */
3357 if (sctp_style(sk, TCP))
3359 if (len != sizeof(int))
3361 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, len))
3366 /* Helper routine to branch off an association to a new socket. */
3367 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3368 struct socket **sockp)
3370 struct sock *sk = asoc->base.sk;
3371 struct socket *sock;
3372 struct inet_sock *inetsk;
3375 /* An association cannot be branched off from an already peeled-off
3376 * socket, nor is this supported for tcp style sockets.
3378 if (!sctp_style(sk, UDP))
3381 /* Create a new socket. */
3382 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
3386 /* Populate the fields of the newsk from the oldsk and migrate the
3387 * asoc to the newsk.
3389 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
3391 /* Make peeled-off sockets more like 1-1 accepted sockets.
3392 * Set the daddr and initialize id to something more random
3394 inetsk = inet_sk(sock->sk);
3395 inetsk->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
3396 inetsk->id = asoc->next_tsn ^ jiffies;
3403 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
3405 sctp_peeloff_arg_t peeloff;
3406 struct socket *newsock;
3408 struct sctp_association *asoc;
3410 if (len != sizeof(sctp_peeloff_arg_t))
3412 if (copy_from_user(&peeloff, optval, len))
3415 asoc = sctp_id2assoc(sk, peeloff.associd);
3421 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __FUNCTION__, sk, asoc);
3423 retval = sctp_do_peeloff(asoc, &newsock);
3427 /* Map the socket to an unused fd that can be returned to the user. */
3428 retval = sock_map_fd(newsock);
3430 sock_release(newsock);
3434 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3435 __FUNCTION__, sk, asoc, newsock->sk, retval);
3437 /* Return the fd mapped to the new socket. */
3438 peeloff.sd = retval;
3439 if (copy_to_user(optval, &peeloff, len))
3446 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3448 * Applications can enable or disable heartbeats for any peer address of
3449 * an association, modify an address's heartbeat interval, force a
3450 * heartbeat to be sent immediately, and adjust the address's maximum
3451 * number of retransmissions sent before an address is considered
3452 * unreachable. The following structure is used to access and modify an
3453 * address's parameters:
3455 * struct sctp_paddrparams {
3456 * sctp_assoc_t spp_assoc_id;
3457 * struct sockaddr_storage spp_address;
3458 * uint32_t spp_hbinterval;
3459 * uint16_t spp_pathmaxrxt;
3460 * uint32_t spp_pathmtu;
3461 * uint32_t spp_sackdelay;
3462 * uint32_t spp_flags;
3465 * spp_assoc_id - (one-to-many style socket) This is filled in the
3466 * application, and identifies the association for
3468 * spp_address - This specifies which address is of interest.
3469 * spp_hbinterval - This contains the value of the heartbeat interval,
3470 * in milliseconds. If a value of zero
3471 * is present in this field then no changes are to
3472 * be made to this parameter.
3473 * spp_pathmaxrxt - This contains the maximum number of
3474 * retransmissions before this address shall be
3475 * considered unreachable. If a value of zero
3476 * is present in this field then no changes are to
3477 * be made to this parameter.
3478 * spp_pathmtu - When Path MTU discovery is disabled the value
3479 * specified here will be the "fixed" path mtu.
3480 * Note that if the spp_address field is empty
3481 * then all associations on this address will
3482 * have this fixed path mtu set upon them.
3484 * spp_sackdelay - When delayed sack is enabled, this value specifies
3485 * the number of milliseconds that sacks will be delayed
3486 * for. This value will apply to all addresses of an
3487 * association if the spp_address field is empty. Note
3488 * also, that if delayed sack is enabled and this
3489 * value is set to 0, no change is made to the last
3490 * recorded delayed sack timer value.
3492 * spp_flags - These flags are used to control various features
3493 * on an association. The flag field may contain
3494 * zero or more of the following options.
3496 * SPP_HB_ENABLE - Enable heartbeats on the
3497 * specified address. Note that if the address
3498 * field is empty all addresses for the association
3499 * have heartbeats enabled upon them.
3501 * SPP_HB_DISABLE - Disable heartbeats on the
3502 * speicifed address. Note that if the address
3503 * field is empty all addresses for the association
3504 * will have their heartbeats disabled. Note also
3505 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3506 * mutually exclusive, only one of these two should
3507 * be specified. Enabling both fields will have
3508 * undetermined results.
3510 * SPP_HB_DEMAND - Request a user initiated heartbeat
3511 * to be made immediately.
3513 * SPP_PMTUD_ENABLE - This field will enable PMTU
3514 * discovery upon the specified address. Note that
3515 * if the address feild is empty then all addresses
3516 * on the association are effected.
3518 * SPP_PMTUD_DISABLE - This field will disable PMTU
3519 * discovery upon the specified address. Note that
3520 * if the address feild is empty then all addresses
3521 * on the association are effected. Not also that
3522 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
3523 * exclusive. Enabling both will have undetermined
3526 * SPP_SACKDELAY_ENABLE - Setting this flag turns
3527 * on delayed sack. The time specified in spp_sackdelay
3528 * is used to specify the sack delay for this address. Note
3529 * that if spp_address is empty then all addresses will
3530 * enable delayed sack and take on the sack delay
3531 * value specified in spp_sackdelay.
3532 * SPP_SACKDELAY_DISABLE - Setting this flag turns
3533 * off delayed sack. If the spp_address field is blank then
3534 * delayed sack is disabled for the entire association. Note
3535 * also that this field is mutually exclusive to
3536 * SPP_SACKDELAY_ENABLE, setting both will have undefined
3539 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
3540 char __user *optval, int __user *optlen)
3542 struct sctp_paddrparams params;
3543 struct sctp_transport *trans = NULL;
3544 struct sctp_association *asoc = NULL;
3545 struct sctp_sock *sp = sctp_sk(sk);
3547 if (len != sizeof(struct sctp_paddrparams))
3550 if (copy_from_user(¶ms, optval, len))
3553 /* If an address other than INADDR_ANY is specified, and
3554 * no transport is found, then the request is invalid.
3556 if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
3557 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
3558 params.spp_assoc_id);
3560 SCTP_DEBUG_PRINTK("Failed no transport\n");
3565 /* Get association, if assoc_id != 0 and the socket is a one
3566 * to many style socket, and an association was not found, then
3567 * the id was invalid.
3569 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
3570 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
3571 SCTP_DEBUG_PRINTK("Failed no association\n");
3576 /* Fetch transport values. */
3577 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
3578 params.spp_pathmtu = trans->pathmtu;
3579 params.spp_pathmaxrxt = trans->pathmaxrxt;
3580 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
3582 /*draft-11 doesn't say what to return in spp_flags*/
3583 params.spp_flags = trans->param_flags;
3585 /* Fetch association values. */
3586 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
3587 params.spp_pathmtu = asoc->pathmtu;
3588 params.spp_pathmaxrxt = asoc->pathmaxrxt;
3589 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
3591 /*draft-11 doesn't say what to return in spp_flags*/
3592 params.spp_flags = asoc->param_flags;
3594 /* Fetch socket values. */
3595 params.spp_hbinterval = sp->hbinterval;
3596 params.spp_pathmtu = sp->pathmtu;
3597 params.spp_sackdelay = sp->sackdelay;
3598 params.spp_pathmaxrxt = sp->pathmaxrxt;
3600 /*draft-11 doesn't say what to return in spp_flags*/
3601 params.spp_flags = sp->param_flags;
3604 if (copy_to_user(optval, ¶ms, len))
3607 if (put_user(len, optlen))
3613 /* 7.1.24. Delayed Ack Timer (SCTP_DELAYED_ACK_TIME)
3615 * This options will get or set the delayed ack timer. The time is set
3616 * in milliseconds. If the assoc_id is 0, then this sets or gets the
3617 * endpoints default delayed ack timer value. If the assoc_id field is
3618 * non-zero, then the set or get effects the specified association.
3620 * struct sctp_assoc_value {
3621 * sctp_assoc_t assoc_id;
3622 * uint32_t assoc_value;
3625 * assoc_id - This parameter, indicates which association the
3626 * user is preforming an action upon. Note that if
3627 * this field's value is zero then the endpoints
3628 * default value is changed (effecting future
3629 * associations only).
3631 * assoc_value - This parameter contains the number of milliseconds
3632 * that the user is requesting the delayed ACK timer
3633 * be set to. Note that this value is defined in
3634 * the standard to be between 200 and 500 milliseconds.
3636 * Note: a value of zero will leave the value alone,
3637 * but disable SACK delay. A non-zero value will also
3638 * enable SACK delay.
3640 static int sctp_getsockopt_delayed_ack_time(struct sock *sk, int len,
3641 char __user *optval,
3644 struct sctp_assoc_value params;
3645 struct sctp_association *asoc = NULL;
3646 struct sctp_sock *sp = sctp_sk(sk);
3648 if (len != sizeof(struct sctp_assoc_value))
3651 if (copy_from_user(¶ms, optval, len))
3654 /* Get association, if assoc_id != 0 and the socket is a one
3655 * to many style socket, and an association was not found, then
3656 * the id was invalid.
3658 asoc = sctp_id2assoc(sk, params.assoc_id);
3659 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3663 /* Fetch association values. */
3664 if (asoc->param_flags & SPP_SACKDELAY_ENABLE)
3665 params.assoc_value = jiffies_to_msecs(
3668 params.assoc_value = 0;
3670 /* Fetch socket values. */
3671 if (sp->param_flags & SPP_SACKDELAY_ENABLE)
3672 params.assoc_value = sp->sackdelay;
3674 params.assoc_value = 0;
3677 if (copy_to_user(optval, ¶ms, len))
3680 if (put_user(len, optlen))
3686 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
3688 * Applications can specify protocol parameters for the default association
3689 * initialization. The option name argument to setsockopt() and getsockopt()
3692 * Setting initialization parameters is effective only on an unconnected
3693 * socket (for UDP-style sockets only future associations are effected
3694 * by the change). With TCP-style sockets, this option is inherited by
3695 * sockets derived from a listener socket.
3697 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
3699 if (len != sizeof(struct sctp_initmsg))
3701 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
3706 static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
3707 char __user *optval,
3711 struct sctp_association *asoc;
3712 struct list_head *pos;
3715 if (len != sizeof(sctp_assoc_t))
3718 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
3721 /* For UDP-style sockets, id specifies the association to query. */
3722 asoc = sctp_id2assoc(sk, id);
3726 list_for_each(pos, &asoc->peer.transport_addr_list) {
3734 * Old API for getting list of peer addresses. Does not work for 32-bit
3735 * programs running on a 64-bit kernel
3737 static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
3738 char __user *optval,
3741 struct sctp_association *asoc;
3742 struct list_head *pos;
3744 struct sctp_getaddrs_old getaddrs;
3745 struct sctp_transport *from;
3747 union sctp_addr temp;
3748 struct sctp_sock *sp = sctp_sk(sk);
3751 if (len != sizeof(struct sctp_getaddrs_old))
3754 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs_old)))
3757 if (getaddrs.addr_num <= 0) return -EINVAL;
3759 /* For UDP-style sockets, id specifies the association to query. */
3760 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
3764 to = (void __user *)getaddrs.addrs;
3765 list_for_each(pos, &asoc->peer.transport_addr_list) {
3766 from = list_entry(pos, struct sctp_transport, transports);
3767 memcpy(&temp, &from->ipaddr_h, sizeof(temp));
3768 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
3769 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
3770 temp.v4.sin_port = htons(temp.v4.sin_port);
3771 if (copy_to_user(to, &temp, addrlen))
3775 if (cnt >= getaddrs.addr_num) break;
3777 getaddrs.addr_num = cnt;
3778 if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs_old)))
3784 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
3785 char __user *optval, int __user *optlen)
3787 struct sctp_association *asoc;
3788 struct list_head *pos;
3790 struct sctp_getaddrs getaddrs;
3791 struct sctp_transport *from;
3793 union sctp_addr temp;
3794 struct sctp_sock *sp = sctp_sk(sk);
3799 if (len < sizeof(struct sctp_getaddrs))
3802 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
3805 /* For UDP-style sockets, id specifies the association to query. */
3806 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
3810 to = optval + offsetof(struct sctp_getaddrs,addrs);
3811 space_left = len - sizeof(struct sctp_getaddrs) -
3812 offsetof(struct sctp_getaddrs,addrs);
3814 list_for_each(pos, &asoc->peer.transport_addr_list) {
3815 from = list_entry(pos, struct sctp_transport, transports);
3816 memcpy(&temp, &from->ipaddr_h, sizeof(temp));
3817 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
3818 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
3819 if(space_left < addrlen)
3821 temp.v4.sin_port = htons(temp.v4.sin_port);
3822 if (copy_to_user(to, &temp, addrlen))
3826 space_left -= addrlen;
3829 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
3831 bytes_copied = ((char __user *)to) - optval;
3832 if (put_user(bytes_copied, optlen))
3838 static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
3839 char __user *optval,
3843 struct sctp_bind_addr *bp;
3844 struct sctp_association *asoc;
3845 struct list_head *pos;
3846 struct sctp_sockaddr_entry *addr;
3847 rwlock_t *addr_lock;
3848 unsigned long flags;
3851 if (len != sizeof(sctp_assoc_t))
3854 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
3858 * For UDP-style sockets, id specifies the association to query.
3859 * If the id field is set to the value '0' then the locally bound
3860 * addresses are returned without regard to any particular
3864 bp = &sctp_sk(sk)->ep->base.bind_addr;
3865 addr_lock = &sctp_sk(sk)->ep->base.addr_lock;
3867 asoc = sctp_id2assoc(sk, id);
3870 bp = &asoc->base.bind_addr;
3871 addr_lock = &asoc->base.addr_lock;
3874 sctp_read_lock(addr_lock);
3876 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
3877 * addresses from the global local address list.
3879 if (sctp_list_single_entry(&bp->address_list)) {
3880 addr = list_entry(bp->address_list.next,
3881 struct sctp_sockaddr_entry, list);
3882 if (sctp_is_any(&addr->a_h)) {
3883 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
3884 list_for_each(pos, &sctp_local_addr_list) {
3885 addr = list_entry(pos,
3886 struct sctp_sockaddr_entry,
3888 if ((PF_INET == sk->sk_family) &&
3889 (AF_INET6 == addr->a_h.sa.sa_family))
3893 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock,
3901 list_for_each(pos, &bp->address_list) {
3906 sctp_read_unlock(addr_lock);
3910 /* Helper function that copies local addresses to user and returns the number
3911 * of addresses copied.
3913 static int sctp_copy_laddrs_to_user_old(struct sock *sk, __u16 port, int max_addrs,
3916 struct list_head *pos;
3917 struct sctp_sockaddr_entry *addr;
3918 unsigned long flags;
3919 union sctp_addr temp;
3923 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
3924 list_for_each(pos, &sctp_local_addr_list) {
3925 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
3926 if ((PF_INET == sk->sk_family) &&
3927 (AF_INET6 == addr->a_h.sa.sa_family))
3929 memcpy(&temp, &addr->a_h, sizeof(temp));
3930 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3932 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
3933 temp.v4.sin_port = htons(port);
3934 if (copy_to_user(to, &temp, addrlen)) {
3935 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock,
3941 if (cnt >= max_addrs) break;
3943 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
3948 static int sctp_copy_laddrs_to_user(struct sock *sk, __u16 port,
3949 void __user **to, size_t space_left)
3951 struct list_head *pos;
3952 struct sctp_sockaddr_entry *addr;
3953 unsigned long flags;
3954 union sctp_addr temp;
3958 sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
3959 list_for_each(pos, &sctp_local_addr_list) {
3960 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
3961 if ((PF_INET == sk->sk_family) &&
3962 (AF_INET6 == addr->a_h.sa.sa_family))
3964 memcpy(&temp, &addr->a_h, sizeof(temp));
3965 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3967 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
3968 if(space_left<addrlen)
3970 temp.v4.sin_port = htons(port);
3971 if (copy_to_user(*to, &temp, addrlen)) {
3972 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock,
3978 space_left -= addrlen;
3980 sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
3985 /* Old API for getting list of local addresses. Does not work for 32-bit
3986 * programs running on a 64-bit kernel
3988 static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
3989 char __user *optval, int __user *optlen)
3991 struct sctp_bind_addr *bp;
3992 struct sctp_association *asoc;
3993 struct list_head *pos;
3995 struct sctp_getaddrs_old getaddrs;
3996 struct sctp_sockaddr_entry *addr;
3998 union sctp_addr temp;
3999 struct sctp_sock *sp = sctp_sk(sk);
4001 rwlock_t *addr_lock;
4004 if (len != sizeof(struct sctp_getaddrs_old))
4007 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs_old)))
4010 if (getaddrs.addr_num <= 0) return -EINVAL;
4012 * For UDP-style sockets, id specifies the association to query.
4013 * If the id field is set to the value '0' then the locally bound
4014 * addresses are returned without regard to any particular
4017 if (0 == getaddrs.assoc_id) {
4018 bp = &sctp_sk(sk)->ep->base.bind_addr;
4019 addr_lock = &sctp_sk(sk)->ep->base.addr_lock;
4021 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4024 bp = &asoc->base.bind_addr;
4025 addr_lock = &asoc->base.addr_lock;
4028 to = getaddrs.addrs;
4030 sctp_read_lock(addr_lock);
4032 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4033 * addresses from the global local address list.
4035 if (sctp_list_single_entry(&bp->address_list)) {
4036 addr = list_entry(bp->address_list.next,
4037 struct sctp_sockaddr_entry, list);
4038 if (sctp_is_any(&addr->a_h)) {
4039 cnt = sctp_copy_laddrs_to_user_old(sk, bp->port,
4050 list_for_each(pos, &bp->address_list) {
4051 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
4052 memcpy(&temp, &addr->a_h, sizeof(temp));
4053 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4054 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4055 temp.v4.sin_port = htons(temp.v4.sin_port);
4056 if (copy_to_user(to, &temp, addrlen)) {
4062 if (cnt >= getaddrs.addr_num) break;
4066 getaddrs.addr_num = cnt;
4067 if (copy_to_user(optval, &getaddrs, sizeof(struct sctp_getaddrs_old)))
4071 sctp_read_unlock(addr_lock);
4075 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4076 char __user *optval, int __user *optlen)
4078 struct sctp_bind_addr *bp;
4079 struct sctp_association *asoc;
4080 struct list_head *pos;
4082 struct sctp_getaddrs getaddrs;
4083 struct sctp_sockaddr_entry *addr;
4085 union sctp_addr temp;
4086 struct sctp_sock *sp = sctp_sk(sk);
4088 rwlock_t *addr_lock;
4093 if (len <= sizeof(struct sctp_getaddrs))
4096 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4100 * For UDP-style sockets, id specifies the association to query.
4101 * If the id field is set to the value '0' then the locally bound
4102 * addresses are returned without regard to any particular
4105 if (0 == getaddrs.assoc_id) {
4106 bp = &sctp_sk(sk)->ep->base.bind_addr;
4107 addr_lock = &sctp_sk(sk)->ep->base.addr_lock;
4109 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4112 bp = &asoc->base.bind_addr;
4113 addr_lock = &asoc->base.addr_lock;
4116 to = optval + offsetof(struct sctp_getaddrs,addrs);
4117 space_left = len - sizeof(struct sctp_getaddrs) -
4118 offsetof(struct sctp_getaddrs,addrs);
4120 sctp_read_lock(addr_lock);
4122 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4123 * addresses from the global local address list.
4125 if (sctp_list_single_entry(&bp->address_list)) {
4126 addr = list_entry(bp->address_list.next,
4127 struct sctp_sockaddr_entry, list);
4128 if (sctp_is_any(&addr->a_h)) {
4129 cnt = sctp_copy_laddrs_to_user(sk, bp->port,
4139 list_for_each(pos, &bp->address_list) {
4140 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
4141 memcpy(&temp, &addr->a_h, sizeof(temp));
4142 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4143 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4144 if(space_left < addrlen)
4145 return -ENOMEM; /*fixme: right error?*/
4146 temp.v4.sin_port = htons(temp.v4.sin_port);
4147 if (copy_to_user(to, &temp, addrlen)) {
4153 space_left -= addrlen;
4157 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4159 bytes_copied = ((char __user *)to) - optval;
4160 if (put_user(bytes_copied, optlen))
4164 sctp_read_unlock(addr_lock);
4168 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4170 * Requests that the local SCTP stack use the enclosed peer address as
4171 * the association primary. The enclosed address must be one of the
4172 * association peer's addresses.
4174 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4175 char __user *optval, int __user *optlen)
4177 struct sctp_prim prim;
4178 struct sctp_association *asoc;
4179 struct sctp_sock *sp = sctp_sk(sk);
4181 if (len != sizeof(struct sctp_prim))
4184 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
4187 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4191 if (!asoc->peer.primary_path)
4194 flip_to_n((union sctp_addr *)&prim.ssp_addr,
4195 &asoc->peer.primary_path->ipaddr_h);
4197 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4198 (union sctp_addr *)&prim.ssp_addr);
4200 if (copy_to_user(optval, &prim, sizeof(struct sctp_prim)))
4207 * 7.1.11 Set Adaption Layer Indicator (SCTP_ADAPTION_LAYER)
4209 * Requests that the local endpoint set the specified Adaption Layer
4210 * Indication parameter for all future INIT and INIT-ACK exchanges.
4212 static int sctp_getsockopt_adaption_layer(struct sock *sk, int len,
4213 char __user *optval, int __user *optlen)
4215 struct sctp_setadaption adaption;
4217 if (len != sizeof(struct sctp_setadaption))
4220 adaption.ssb_adaption_ind = sctp_sk(sk)->adaption_ind;
4221 if (copy_to_user(optval, &adaption, len))
4229 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4231 * Applications that wish to use the sendto() system call may wish to
4232 * specify a default set of parameters that would normally be supplied
4233 * through the inclusion of ancillary data. This socket option allows
4234 * such an application to set the default sctp_sndrcvinfo structure.
4237 * The application that wishes to use this socket option simply passes
4238 * in to this call the sctp_sndrcvinfo structure defined in Section
4239 * 5.2.2) The input parameters accepted by this call include
4240 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4241 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4242 * to this call if the caller is using the UDP model.
4244 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4246 static int sctp_getsockopt_default_send_param(struct sock *sk,
4247 int len, char __user *optval,
4250 struct sctp_sndrcvinfo info;
4251 struct sctp_association *asoc;
4252 struct sctp_sock *sp = sctp_sk(sk);
4254 if (len != sizeof(struct sctp_sndrcvinfo))
4256 if (copy_from_user(&info, optval, sizeof(struct sctp_sndrcvinfo)))
4259 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4260 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4264 info.sinfo_stream = asoc->default_stream;
4265 info.sinfo_flags = asoc->default_flags;
4266 info.sinfo_ppid = asoc->default_ppid;
4267 info.sinfo_context = asoc->default_context;
4268 info.sinfo_timetolive = asoc->default_timetolive;
4270 info.sinfo_stream = sp->default_stream;
4271 info.sinfo_flags = sp->default_flags;
4272 info.sinfo_ppid = sp->default_ppid;
4273 info.sinfo_context = sp->default_context;
4274 info.sinfo_timetolive = sp->default_timetolive;
4277 if (copy_to_user(optval, &info, sizeof(struct sctp_sndrcvinfo)))
4285 * 7.1.5 SCTP_NODELAY
4287 * Turn on/off any Nagle-like algorithm. This means that packets are
4288 * generally sent as soon as possible and no unnecessary delays are
4289 * introduced, at the cost of more packets in the network. Expects an
4290 * integer boolean flag.
4293 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4294 char __user *optval, int __user *optlen)
4298 if (len < sizeof(int))
4302 val = (sctp_sk(sk)->nodelay == 1);
4303 if (put_user(len, optlen))
4305 if (copy_to_user(optval, &val, len))
4312 * 7.1.1 SCTP_RTOINFO
4314 * The protocol parameters used to initialize and bound retransmission
4315 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4316 * and modify these parameters.
4317 * All parameters are time values, in milliseconds. A value of 0, when
4318 * modifying the parameters, indicates that the current value should not
4322 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4323 char __user *optval,
4324 int __user *optlen) {
4325 struct sctp_rtoinfo rtoinfo;
4326 struct sctp_association *asoc;
4328 if (len != sizeof (struct sctp_rtoinfo))
4331 if (copy_from_user(&rtoinfo, optval, sizeof (struct sctp_rtoinfo)))
4334 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4336 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4339 /* Values corresponding to the specific association. */
4341 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4342 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4343 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4345 /* Values corresponding to the endpoint. */
4346 struct sctp_sock *sp = sctp_sk(sk);
4348 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4349 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4350 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4353 if (put_user(len, optlen))
4356 if (copy_to_user(optval, &rtoinfo, len))
4364 * 7.1.2 SCTP_ASSOCINFO
4366 * This option is used to tune the the maximum retransmission attempts
4367 * of the association.
4368 * Returns an error if the new association retransmission value is
4369 * greater than the sum of the retransmission value of the peer.
4370 * See [SCTP] for more information.
4373 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4374 char __user *optval,
4378 struct sctp_assocparams assocparams;
4379 struct sctp_association *asoc;
4380 struct list_head *pos;
4383 if (len != sizeof (struct sctp_assocparams))
4386 if (copy_from_user(&assocparams, optval,
4387 sizeof (struct sctp_assocparams)))
4390 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4392 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4395 /* Values correspoinding to the specific association */
4397 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4398 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4399 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4400 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4402 (asoc->cookie_life.tv_usec
4405 list_for_each(pos, &asoc->peer.transport_addr_list) {
4409 assocparams.sasoc_number_peer_destinations = cnt;
4411 /* Values corresponding to the endpoint */
4412 struct sctp_sock *sp = sctp_sk(sk);
4414 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
4415 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
4416 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
4417 assocparams.sasoc_cookie_life =
4418 sp->assocparams.sasoc_cookie_life;
4419 assocparams.sasoc_number_peer_destinations =
4421 sasoc_number_peer_destinations;
4424 if (put_user(len, optlen))
4427 if (copy_to_user(optval, &assocparams, len))
4434 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4436 * This socket option is a boolean flag which turns on or off mapped V4
4437 * addresses. If this option is turned on and the socket is type
4438 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4439 * If this option is turned off, then no mapping will be done of V4
4440 * addresses and a user will receive both PF_INET6 and PF_INET type
4441 * addresses on the socket.
4443 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
4444 char __user *optval, int __user *optlen)
4447 struct sctp_sock *sp = sctp_sk(sk);
4449 if (len < sizeof(int))
4454 if (put_user(len, optlen))
4456 if (copy_to_user(optval, &val, len))
4463 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
4465 * This socket option specifies the maximum size to put in any outgoing
4466 * SCTP chunk. If a message is larger than this size it will be
4467 * fragmented by SCTP into the specified size. Note that the underlying
4468 * SCTP implementation may fragment into smaller sized chunks when the
4469 * PMTU of the underlying association is smaller than the value set by
4472 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
4473 char __user *optval, int __user *optlen)
4477 if (len < sizeof(int))
4482 val = sctp_sk(sk)->user_frag;
4483 if (put_user(len, optlen))
4485 if (copy_to_user(optval, &val, len))
4491 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
4492 char __user *optval, int __user *optlen)
4497 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
4500 /* I can hardly begin to describe how wrong this is. This is
4501 * so broken as to be worse than useless. The API draft
4502 * REALLY is NOT helpful here... I am not convinced that the
4503 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
4504 * are at all well-founded.
4506 if (level != SOL_SCTP) {
4507 struct sctp_af *af = sctp_sk(sk)->pf->af;
4509 retval = af->getsockopt(sk, level, optname, optval, optlen);
4513 if (get_user(len, optlen))
4520 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
4522 case SCTP_DISABLE_FRAGMENTS:
4523 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
4527 retval = sctp_getsockopt_events(sk, len, optval, optlen);
4529 case SCTP_AUTOCLOSE:
4530 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
4532 case SCTP_SOCKOPT_PEELOFF:
4533 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
4535 case SCTP_PEER_ADDR_PARAMS:
4536 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
4539 case SCTP_DELAYED_ACK_TIME:
4540 retval = sctp_getsockopt_delayed_ack_time(sk, len, optval,
4544 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
4546 case SCTP_GET_PEER_ADDRS_NUM_OLD:
4547 retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
4550 case SCTP_GET_LOCAL_ADDRS_NUM_OLD:
4551 retval = sctp_getsockopt_local_addrs_num_old(sk, len, optval,
4554 case SCTP_GET_PEER_ADDRS_OLD:
4555 retval = sctp_getsockopt_peer_addrs_old(sk, len, optval,
4558 case SCTP_GET_LOCAL_ADDRS_OLD:
4559 retval = sctp_getsockopt_local_addrs_old(sk, len, optval,
4562 case SCTP_GET_PEER_ADDRS:
4563 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
4566 case SCTP_GET_LOCAL_ADDRS:
4567 retval = sctp_getsockopt_local_addrs(sk, len, optval,
4570 case SCTP_DEFAULT_SEND_PARAM:
4571 retval = sctp_getsockopt_default_send_param(sk, len,
4574 case SCTP_PRIMARY_ADDR:
4575 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
4578 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
4581 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
4583 case SCTP_ASSOCINFO:
4584 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
4586 case SCTP_I_WANT_MAPPED_V4_ADDR:
4587 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
4590 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
4592 case SCTP_GET_PEER_ADDR_INFO:
4593 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
4596 case SCTP_ADAPTION_LAYER:
4597 retval = sctp_getsockopt_adaption_layer(sk, len, optval,
4601 retval = -ENOPROTOOPT;
4605 sctp_release_sock(sk);
4609 static void sctp_hash(struct sock *sk)
4614 static void sctp_unhash(struct sock *sk)
4619 /* Check if port is acceptable. Possibly find first available port.
4621 * The port hash table (contained in the 'global' SCTP protocol storage
4622 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
4623 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
4624 * list (the list number is the port number hashed out, so as you
4625 * would expect from a hash function, all the ports in a given list have
4626 * such a number that hashes out to the same list number; you were
4627 * expecting that, right?); so each list has a set of ports, with a
4628 * link to the socket (struct sock) that uses it, the port number and
4629 * a fastreuse flag (FIXME: NPI ipg).
4631 static struct sctp_bind_bucket *sctp_bucket_create(
4632 struct sctp_bind_hashbucket *head, unsigned short snum);
4634 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
4636 struct sctp_bind_hashbucket *head; /* hash list */
4637 struct sctp_bind_bucket *pp; /* hash list port iterator */
4638 unsigned short snum;
4641 snum = ntohs(addr->v4.sin_port);
4643 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
4644 sctp_local_bh_disable();
4647 /* Search for an available port.
4649 * 'sctp_port_rover' was the last port assigned, so
4650 * we start to search from 'sctp_port_rover +
4651 * 1'. What we do is first check if port 'rover' is
4652 * already in the hash table; if not, we use that; if
4653 * it is, we try next.
4655 int low = sysctl_local_port_range[0];
4656 int high = sysctl_local_port_range[1];
4657 int remaining = (high - low) + 1;
4661 sctp_spin_lock(&sctp_port_alloc_lock);
4662 rover = sctp_port_rover;
4665 if ((rover < low) || (rover > high))
4667 index = sctp_phashfn(rover);
4668 head = &sctp_port_hashtable[index];
4669 sctp_spin_lock(&head->lock);
4670 for (pp = head->chain; pp; pp = pp->next)
4671 if (pp->port == rover)
4675 sctp_spin_unlock(&head->lock);
4676 } while (--remaining > 0);
4677 sctp_port_rover = rover;
4678 sctp_spin_unlock(&sctp_port_alloc_lock);
4680 /* Exhausted local port range during search? */
4685 /* OK, here is the one we will use. HEAD (the port
4686 * hash table list entry) is non-NULL and we hold it's
4691 /* We are given an specific port number; we verify
4692 * that it is not being used. If it is used, we will
4693 * exahust the search in the hash list corresponding
4694 * to the port number (snum) - we detect that with the
4695 * port iterator, pp being NULL.
4697 head = &sctp_port_hashtable[sctp_phashfn(snum)];
4698 sctp_spin_lock(&head->lock);
4699 for (pp = head->chain; pp; pp = pp->next) {
4700 if (pp->port == snum)
4707 if (!hlist_empty(&pp->owner)) {
4708 /* We had a port hash table hit - there is an
4709 * available port (pp != NULL) and it is being
4710 * used by other socket (pp->owner not empty); that other
4711 * socket is going to be sk2.
4713 int reuse = sk->sk_reuse;
4715 struct hlist_node *node;
4717 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
4718 if (pp->fastreuse && sk->sk_reuse)
4721 /* Run through the list of sockets bound to the port
4722 * (pp->port) [via the pointers bind_next and
4723 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
4724 * we get the endpoint they describe and run through
4725 * the endpoint's list of IP (v4 or v6) addresses,
4726 * comparing each of the addresses with the address of
4727 * the socket sk. If we find a match, then that means
4728 * that this port/socket (sk) combination are already
4731 sk_for_each_bound(sk2, node, &pp->owner) {
4732 struct sctp_endpoint *ep2;
4733 ep2 = sctp_sk(sk2)->ep;
4735 if (reuse && sk2->sk_reuse)
4738 if (sctp_bind_addr_match(&ep2->base.bind_addr, addr,
4744 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
4747 /* If there was a hash table miss, create a new port. */
4749 if (!pp && !(pp = sctp_bucket_create(head, snum)))
4752 /* In either case (hit or miss), make sure fastreuse is 1 only
4753 * if sk->sk_reuse is too (that is, if the caller requested
4754 * SO_REUSEADDR on this socket -sk-).
4756 if (hlist_empty(&pp->owner))
4757 pp->fastreuse = sk->sk_reuse ? 1 : 0;
4758 else if (pp->fastreuse && !sk->sk_reuse)
4761 /* We are set, so fill up all the data in the hash table
4762 * entry, tie the socket list information with the rest of the
4763 * sockets FIXME: Blurry, NPI (ipg).
4766 inet_sk(sk)->num = snum;
4767 if (!sctp_sk(sk)->bind_hash) {
4768 sk_add_bind_node(sk, &pp->owner);
4769 sctp_sk(sk)->bind_hash = pp;
4774 sctp_spin_unlock(&head->lock);
4777 sctp_local_bh_enable();
4781 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
4782 * port is requested.
4784 static int sctp_get_port(struct sock *sk, unsigned short snum)
4787 union sctp_addr addr;
4788 struct sctp_af *af = sctp_sk(sk)->pf->af;
4790 /* Set up a dummy address struct from the sk. */
4791 af->from_sk(&addr, sk);
4792 addr.v4.sin_port = htons(snum);
4794 /* Note: sk->sk_num gets filled in if ephemeral port request. */
4795 ret = sctp_get_port_local(sk, &addr);
4797 return (ret ? 1 : 0);
4801 * 3.1.3 listen() - UDP Style Syntax
4803 * By default, new associations are not accepted for UDP style sockets.
4804 * An application uses listen() to mark a socket as being able to
4805 * accept new associations.
4807 SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
4809 struct sctp_sock *sp = sctp_sk(sk);
4810 struct sctp_endpoint *ep = sp->ep;
4812 /* Only UDP style sockets that are not peeled off are allowed to
4815 if (!sctp_style(sk, UDP))
4818 /* If backlog is zero, disable listening. */
4820 if (sctp_sstate(sk, CLOSED))
4823 sctp_unhash_endpoint(ep);
4824 sk->sk_state = SCTP_SS_CLOSED;
4827 /* Return if we are already listening. */
4828 if (sctp_sstate(sk, LISTENING))
4832 * If a bind() or sctp_bindx() is not called prior to a listen()
4833 * call that allows new associations to be accepted, the system
4834 * picks an ephemeral port and will choose an address set equivalent
4835 * to binding with a wildcard address.
4837 * This is not currently spelled out in the SCTP sockets
4838 * extensions draft, but follows the practice as seen in TCP
4841 if (!ep->base.bind_addr.port) {
4842 if (sctp_autobind(sk))
4845 sk->sk_state = SCTP_SS_LISTENING;
4846 sctp_hash_endpoint(ep);
4851 * 4.1.3 listen() - TCP Style Syntax
4853 * Applications uses listen() to ready the SCTP endpoint for accepting
4854 * inbound associations.
4856 SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
4858 struct sctp_sock *sp = sctp_sk(sk);
4859 struct sctp_endpoint *ep = sp->ep;
4861 /* If backlog is zero, disable listening. */
4863 if (sctp_sstate(sk, CLOSED))
4866 sctp_unhash_endpoint(ep);
4867 sk->sk_state = SCTP_SS_CLOSED;
4870 if (sctp_sstate(sk, LISTENING))
4874 * If a bind() or sctp_bindx() is not called prior to a listen()
4875 * call that allows new associations to be accepted, the system
4876 * picks an ephemeral port and will choose an address set equivalent
4877 * to binding with a wildcard address.
4879 * This is not currently spelled out in the SCTP sockets
4880 * extensions draft, but follows the practice as seen in TCP
4883 if (!ep->base.bind_addr.port) {
4884 if (sctp_autobind(sk))
4887 sk->sk_state = SCTP_SS_LISTENING;
4888 sk->sk_max_ack_backlog = backlog;
4889 sctp_hash_endpoint(ep);
4894 * Move a socket to LISTENING state.
4896 int sctp_inet_listen(struct socket *sock, int backlog)
4898 struct sock *sk = sock->sk;
4899 struct crypto_hash *tfm = NULL;
4902 if (unlikely(backlog < 0))
4907 if (sock->state != SS_UNCONNECTED)
4910 /* Allocate HMAC for generating cookie. */
4911 if (sctp_hmac_alg) {
4912 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
4919 switch (sock->type) {
4920 case SOCK_SEQPACKET:
4921 err = sctp_seqpacket_listen(sk, backlog);
4924 err = sctp_stream_listen(sk, backlog);
4932 /* Store away the transform reference. */
4933 sctp_sk(sk)->hmac = tfm;
4935 sctp_release_sock(sk);
4938 crypto_free_hash(tfm);
4943 * This function is done by modeling the current datagram_poll() and the
4944 * tcp_poll(). Note that, based on these implementations, we don't
4945 * lock the socket in this function, even though it seems that,
4946 * ideally, locking or some other mechanisms can be used to ensure
4947 * the integrity of the counters (sndbuf and wmem_alloc) used
4948 * in this place. We assume that we don't need locks either until proven
4951 * Another thing to note is that we include the Async I/O support
4952 * here, again, by modeling the current TCP/UDP code. We don't have
4953 * a good way to test with it yet.
4955 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
4957 struct sock *sk = sock->sk;
4958 struct sctp_sock *sp = sctp_sk(sk);
4961 poll_wait(file, sk->sk_sleep, wait);
4963 /* A TCP-style listening socket becomes readable when the accept queue
4966 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4967 return (!list_empty(&sp->ep->asocs)) ?
4968 (POLLIN | POLLRDNORM) : 0;
4972 /* Is there any exceptional events? */
4973 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
4975 if (sk->sk_shutdown & RCV_SHUTDOWN)
4977 if (sk->sk_shutdown == SHUTDOWN_MASK)
4980 /* Is it readable? Reconsider this code with TCP-style support. */
4981 if (!skb_queue_empty(&sk->sk_receive_queue) ||
4982 (sk->sk_shutdown & RCV_SHUTDOWN))
4983 mask |= POLLIN | POLLRDNORM;
4985 /* The association is either gone or not ready. */
4986 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
4989 /* Is it writable? */
4990 if (sctp_writeable(sk)) {
4991 mask |= POLLOUT | POLLWRNORM;
4993 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
4995 * Since the socket is not locked, the buffer
4996 * might be made available after the writeable check and
4997 * before the bit is set. This could cause a lost I/O
4998 * signal. tcp_poll() has a race breaker for this race
4999 * condition. Based on their implementation, we put
5000 * in the following code to cover it as well.
5002 if (sctp_writeable(sk))
5003 mask |= POLLOUT | POLLWRNORM;
5008 /********************************************************************
5009 * 2nd Level Abstractions
5010 ********************************************************************/
5012 static struct sctp_bind_bucket *sctp_bucket_create(
5013 struct sctp_bind_hashbucket *head, unsigned short snum)
5015 struct sctp_bind_bucket *pp;
5017 pp = kmem_cache_alloc(sctp_bucket_cachep, SLAB_ATOMIC);
5018 SCTP_DBG_OBJCNT_INC(bind_bucket);
5022 INIT_HLIST_HEAD(&pp->owner);
5023 if ((pp->next = head->chain) != NULL)
5024 pp->next->pprev = &pp->next;
5026 pp->pprev = &head->chain;
5031 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5032 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5034 if (pp && hlist_empty(&pp->owner)) {
5036 pp->next->pprev = pp->pprev;
5037 *(pp->pprev) = pp->next;
5038 kmem_cache_free(sctp_bucket_cachep, pp);
5039 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5043 /* Release this socket's reference to a local port. */
5044 static inline void __sctp_put_port(struct sock *sk)
5046 struct sctp_bind_hashbucket *head =
5047 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->num)];
5048 struct sctp_bind_bucket *pp;
5050 sctp_spin_lock(&head->lock);
5051 pp = sctp_sk(sk)->bind_hash;
5052 __sk_del_bind_node(sk);
5053 sctp_sk(sk)->bind_hash = NULL;
5054 inet_sk(sk)->num = 0;
5055 sctp_bucket_destroy(pp);
5056 sctp_spin_unlock(&head->lock);
5059 void sctp_put_port(struct sock *sk)
5061 sctp_local_bh_disable();
5062 __sctp_put_port(sk);
5063 sctp_local_bh_enable();
5067 * The system picks an ephemeral port and choose an address set equivalent
5068 * to binding with a wildcard address.
5069 * One of those addresses will be the primary address for the association.
5070 * This automatically enables the multihoming capability of SCTP.
5072 static int sctp_autobind(struct sock *sk)
5074 union sctp_addr autoaddr;
5076 unsigned short port;
5078 /* Initialize a local sockaddr structure to INADDR_ANY. */
5079 af = sctp_sk(sk)->pf->af;
5081 port = htons(inet_sk(sk)->num);
5082 af->inaddr_any(&autoaddr, port);
5084 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
5087 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5090 * 4.2 The cmsghdr Structure *
5092 * When ancillary data is sent or received, any number of ancillary data
5093 * objects can be specified by the msg_control and msg_controllen members of
5094 * the msghdr structure, because each object is preceded by
5095 * a cmsghdr structure defining the object's length (the cmsg_len member).
5096 * Historically Berkeley-derived implementations have passed only one object
5097 * at a time, but this API allows multiple objects to be
5098 * passed in a single call to sendmsg() or recvmsg(). The following example
5099 * shows two ancillary data objects in a control buffer.
5101 * |<--------------------------- msg_controllen -------------------------->|
5104 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5106 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5109 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5111 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5114 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5115 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5117 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5119 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5126 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
5127 sctp_cmsgs_t *cmsgs)
5129 struct cmsghdr *cmsg;
5131 for (cmsg = CMSG_FIRSTHDR(msg);
5133 cmsg = CMSG_NXTHDR((struct msghdr*)msg, cmsg)) {
5134 if (!CMSG_OK(msg, cmsg))
5137 /* Should we parse this header or ignore? */
5138 if (cmsg->cmsg_level != IPPROTO_SCTP)
5141 /* Strictly check lengths following example in SCM code. */
5142 switch (cmsg->cmsg_type) {
5144 /* SCTP Socket API Extension
5145 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5147 * This cmsghdr structure provides information for
5148 * initializing new SCTP associations with sendmsg().
5149 * The SCTP_INITMSG socket option uses this same data
5150 * structure. This structure is not used for
5153 * cmsg_level cmsg_type cmsg_data[]
5154 * ------------ ------------ ----------------------
5155 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5157 if (cmsg->cmsg_len !=
5158 CMSG_LEN(sizeof(struct sctp_initmsg)))
5160 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
5164 /* SCTP Socket API Extension
5165 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5167 * This cmsghdr structure specifies SCTP options for
5168 * sendmsg() and describes SCTP header information
5169 * about a received message through recvmsg().
5171 * cmsg_level cmsg_type cmsg_data[]
5172 * ------------ ------------ ----------------------
5173 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5175 if (cmsg->cmsg_len !=
5176 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
5180 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
5182 /* Minimally, validate the sinfo_flags. */
5183 if (cmsgs->info->sinfo_flags &
5184 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
5185 SCTP_ABORT | SCTP_EOF))
5197 * Wait for a packet..
5198 * Note: This function is the same function as in core/datagram.c
5199 * with a few modifications to make lksctp work.
5201 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
5206 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
5208 /* Socket errors? */
5209 error = sock_error(sk);
5213 if (!skb_queue_empty(&sk->sk_receive_queue))
5216 /* Socket shut down? */
5217 if (sk->sk_shutdown & RCV_SHUTDOWN)
5220 /* Sequenced packets can come disconnected. If so we report the
5225 /* Is there a good reason to think that we may receive some data? */
5226 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
5229 /* Handle signals. */
5230 if (signal_pending(current))
5233 /* Let another process have a go. Since we are going to sleep
5234 * anyway. Note: This may cause odd behaviors if the message
5235 * does not fit in the user's buffer, but this seems to be the
5236 * only way to honor MSG_DONTWAIT realistically.
5238 sctp_release_sock(sk);
5239 *timeo_p = schedule_timeout(*timeo_p);
5243 finish_wait(sk->sk_sleep, &wait);
5247 error = sock_intr_errno(*timeo_p);
5250 finish_wait(sk->sk_sleep, &wait);
5255 /* Receive a datagram.
5256 * Note: This is pretty much the same routine as in core/datagram.c
5257 * with a few changes to make lksctp work.
5259 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
5260 int noblock, int *err)
5263 struct sk_buff *skb;
5266 timeo = sock_rcvtimeo(sk, noblock);
5268 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
5269 timeo, MAX_SCHEDULE_TIMEOUT);
5272 /* Again only user level code calls this function,
5273 * so nothing interrupt level
5274 * will suddenly eat the receive_queue.
5276 * Look at current nfs client by the way...
5277 * However, this function was corrent in any case. 8)
5279 if (flags & MSG_PEEK) {
5280 spin_lock_bh(&sk->sk_receive_queue.lock);
5281 skb = skb_peek(&sk->sk_receive_queue);
5283 atomic_inc(&skb->users);
5284 spin_unlock_bh(&sk->sk_receive_queue.lock);
5286 skb = skb_dequeue(&sk->sk_receive_queue);
5292 /* Caller is allowed not to check sk->sk_err before calling. */
5293 error = sock_error(sk);
5297 if (sk->sk_shutdown & RCV_SHUTDOWN)
5300 /* User doesn't want to wait. */
5304 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
5313 /* If sndbuf has changed, wake up per association sndbuf waiters. */
5314 static void __sctp_write_space(struct sctp_association *asoc)
5316 struct sock *sk = asoc->base.sk;
5317 struct socket *sock = sk->sk_socket;
5319 if ((sctp_wspace(asoc) > 0) && sock) {
5320 if (waitqueue_active(&asoc->wait))
5321 wake_up_interruptible(&asoc->wait);
5323 if (sctp_writeable(sk)) {
5324 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
5325 wake_up_interruptible(sk->sk_sleep);
5327 /* Note that we try to include the Async I/O support
5328 * here by modeling from the current TCP/UDP code.
5329 * We have not tested with it yet.
5331 if (sock->fasync_list &&
5332 !(sk->sk_shutdown & SEND_SHUTDOWN))
5333 sock_wake_async(sock, 2, POLL_OUT);
5338 /* Do accounting for the sndbuf space.
5339 * Decrement the used sndbuf space of the corresponding association by the
5340 * data size which was just transmitted(freed).
5342 static void sctp_wfree(struct sk_buff *skb)
5344 struct sctp_association *asoc;
5345 struct sctp_chunk *chunk;
5348 /* Get the saved chunk pointer. */
5349 chunk = *((struct sctp_chunk **)(skb->cb));
5352 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
5353 sizeof(struct sk_buff) +
5354 sizeof(struct sctp_chunk);
5356 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
5359 __sctp_write_space(asoc);
5361 sctp_association_put(asoc);
5364 /* Do accounting for the receive space on the socket.
5365 * Accounting for the association is done in ulpevent.c
5366 * We set this as a destructor for the cloned data skbs so that
5367 * accounting is done at the correct time.
5369 void sctp_sock_rfree(struct sk_buff *skb)
5371 struct sock *sk = skb->sk;
5372 struct sctp_ulpevent *event = sctp_skb2event(skb);
5374 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
5378 /* Helper function to wait for space in the sndbuf. */
5379 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
5382 struct sock *sk = asoc->base.sk;
5384 long current_timeo = *timeo_p;
5387 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
5388 asoc, (long)(*timeo_p), msg_len);
5390 /* Increment the association's refcnt. */
5391 sctp_association_hold(asoc);
5393 /* Wait on the association specific sndbuf space. */
5395 prepare_to_wait_exclusive(&asoc->wait, &wait,
5396 TASK_INTERRUPTIBLE);
5399 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
5402 if (signal_pending(current))
5403 goto do_interrupted;
5404 if (msg_len <= sctp_wspace(asoc))
5407 /* Let another process have a go. Since we are going
5410 sctp_release_sock(sk);
5411 current_timeo = schedule_timeout(current_timeo);
5412 BUG_ON(sk != asoc->base.sk);
5415 *timeo_p = current_timeo;
5419 finish_wait(&asoc->wait, &wait);
5421 /* Release the association's refcnt. */
5422 sctp_association_put(asoc);
5431 err = sock_intr_errno(*timeo_p);
5439 /* If socket sndbuf has changed, wake up all per association waiters. */
5440 void sctp_write_space(struct sock *sk)
5442 struct sctp_association *asoc;
5443 struct list_head *pos;
5445 /* Wake up the tasks in each wait queue. */
5446 list_for_each(pos, &((sctp_sk(sk))->ep->asocs)) {
5447 asoc = list_entry(pos, struct sctp_association, asocs);
5448 __sctp_write_space(asoc);
5452 /* Is there any sndbuf space available on the socket?
5454 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
5455 * associations on the same socket. For a UDP-style socket with
5456 * multiple associations, it is possible for it to be "unwriteable"
5457 * prematurely. I assume that this is acceptable because
5458 * a premature "unwriteable" is better than an accidental "writeable" which
5459 * would cause an unwanted block under certain circumstances. For the 1-1
5460 * UDP-style sockets or TCP-style sockets, this code should work.
5463 static int sctp_writeable(struct sock *sk)
5467 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
5473 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
5474 * returns immediately with EINPROGRESS.
5476 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
5478 struct sock *sk = asoc->base.sk;
5480 long current_timeo = *timeo_p;
5483 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __FUNCTION__, asoc,
5486 /* Increment the association's refcnt. */
5487 sctp_association_hold(asoc);
5490 prepare_to_wait_exclusive(&asoc->wait, &wait,
5491 TASK_INTERRUPTIBLE);
5494 if (sk->sk_shutdown & RCV_SHUTDOWN)
5496 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
5499 if (signal_pending(current))
5500 goto do_interrupted;
5502 if (sctp_state(asoc, ESTABLISHED))
5505 /* Let another process have a go. Since we are going
5508 sctp_release_sock(sk);
5509 current_timeo = schedule_timeout(current_timeo);
5512 *timeo_p = current_timeo;
5516 finish_wait(&asoc->wait, &wait);
5518 /* Release the association's refcnt. */
5519 sctp_association_put(asoc);
5524 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
5527 err = -ECONNREFUSED;
5531 err = sock_intr_errno(*timeo_p);
5539 static int sctp_wait_for_accept(struct sock *sk, long timeo)
5541 struct sctp_endpoint *ep;
5545 ep = sctp_sk(sk)->ep;
5549 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
5550 TASK_INTERRUPTIBLE);
5552 if (list_empty(&ep->asocs)) {
5553 sctp_release_sock(sk);
5554 timeo = schedule_timeout(timeo);
5559 if (!sctp_sstate(sk, LISTENING))
5563 if (!list_empty(&ep->asocs))
5566 err = sock_intr_errno(timeo);
5567 if (signal_pending(current))
5575 finish_wait(sk->sk_sleep, &wait);
5580 void sctp_wait_for_close(struct sock *sk, long timeout)
5585 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
5586 if (list_empty(&sctp_sk(sk)->ep->asocs))
5588 sctp_release_sock(sk);
5589 timeout = schedule_timeout(timeout);
5591 } while (!signal_pending(current) && timeout);
5593 finish_wait(sk->sk_sleep, &wait);
5596 /* Populate the fields of the newsk from the oldsk and migrate the assoc
5597 * and its messages to the newsk.
5599 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
5600 struct sctp_association *assoc,
5601 sctp_socket_type_t type)
5603 struct sctp_sock *oldsp = sctp_sk(oldsk);
5604 struct sctp_sock *newsp = sctp_sk(newsk);
5605 struct sctp_bind_bucket *pp; /* hash list port iterator */
5606 struct sctp_endpoint *newep = newsp->ep;
5607 struct sk_buff *skb, *tmp;
5608 struct sctp_ulpevent *event;
5611 /* Migrate socket buffer sizes and all the socket level options to the
5614 newsk->sk_sndbuf = oldsk->sk_sndbuf;
5615 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
5616 /* Brute force copy old sctp opt. */
5617 inet_sk_copy_descendant(newsk, oldsk);
5619 /* Restore the ep value that was overwritten with the above structure
5625 /* Hook this new socket in to the bind_hash list. */
5626 pp = sctp_sk(oldsk)->bind_hash;
5627 sk_add_bind_node(newsk, &pp->owner);
5628 sctp_sk(newsk)->bind_hash = pp;
5629 inet_sk(newsk)->num = inet_sk(oldsk)->num;
5631 /* Copy the bind_addr list from the original endpoint to the new
5632 * endpoint so that we can handle restarts properly
5634 if (PF_INET6 == assoc->base.sk->sk_family)
5635 flags = SCTP_ADDR6_ALLOWED;
5636 if (assoc->peer.ipv4_address)
5637 flags |= SCTP_ADDR4_PEERSUPP;
5638 if (assoc->peer.ipv6_address)
5639 flags |= SCTP_ADDR6_PEERSUPP;
5640 sctp_bind_addr_copy(&newsp->ep->base.bind_addr,
5641 &oldsp->ep->base.bind_addr,
5642 SCTP_SCOPE_GLOBAL, GFP_KERNEL, flags);
5644 /* Move any messages in the old socket's receive queue that are for the
5645 * peeled off association to the new socket's receive queue.
5647 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
5648 event = sctp_skb2event(skb);
5649 if (event->asoc == assoc) {
5650 sctp_sock_rfree(skb);
5651 __skb_unlink(skb, &oldsk->sk_receive_queue);
5652 __skb_queue_tail(&newsk->sk_receive_queue, skb);
5653 sctp_skb_set_owner_r(skb, newsk);
5657 /* Clean up any messages pending delivery due to partial
5658 * delivery. Three cases:
5659 * 1) No partial deliver; no work.
5660 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
5661 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
5663 skb_queue_head_init(&newsp->pd_lobby);
5664 sctp_sk(newsk)->pd_mode = assoc->ulpq.pd_mode;
5666 if (sctp_sk(oldsk)->pd_mode) {
5667 struct sk_buff_head *queue;
5669 /* Decide which queue to move pd_lobby skbs to. */
5670 if (assoc->ulpq.pd_mode) {
5671 queue = &newsp->pd_lobby;
5673 queue = &newsk->sk_receive_queue;
5675 /* Walk through the pd_lobby, looking for skbs that
5676 * need moved to the new socket.
5678 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
5679 event = sctp_skb2event(skb);
5680 if (event->asoc == assoc) {
5681 sctp_sock_rfree(skb);
5682 __skb_unlink(skb, &oldsp->pd_lobby);
5683 __skb_queue_tail(queue, skb);
5684 sctp_skb_set_owner_r(skb, newsk);
5688 /* Clear up any skbs waiting for the partial
5689 * delivery to finish.
5691 if (assoc->ulpq.pd_mode)
5692 sctp_clear_pd(oldsk);
5696 /* Set the type of socket to indicate that it is peeled off from the
5697 * original UDP-style socket or created with the accept() call on a
5698 * TCP-style socket..
5702 /* Mark the new socket "in-use" by the user so that any packets
5703 * that may arrive on the association after we've moved it are
5704 * queued to the backlog. This prevents a potential race between
5705 * backlog processing on the old socket and new-packet processing
5706 * on the new socket.
5708 sctp_lock_sock(newsk);
5709 sctp_assoc_migrate(assoc, newsk);
5711 /* If the association on the newsk is already closed before accept()
5712 * is called, set RCV_SHUTDOWN flag.
5714 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
5715 newsk->sk_shutdown |= RCV_SHUTDOWN;
5717 newsk->sk_state = SCTP_SS_ESTABLISHED;
5718 sctp_release_sock(newsk);
5721 /* This proto struct describes the ULP interface for SCTP. */
5722 struct proto sctp_prot = {
5724 .owner = THIS_MODULE,
5725 .close = sctp_close,
5726 .connect = sctp_connect,
5727 .disconnect = sctp_disconnect,
5728 .accept = sctp_accept,
5729 .ioctl = sctp_ioctl,
5730 .init = sctp_init_sock,
5731 .destroy = sctp_destroy_sock,
5732 .shutdown = sctp_shutdown,
5733 .setsockopt = sctp_setsockopt,
5734 .getsockopt = sctp_getsockopt,
5735 .sendmsg = sctp_sendmsg,
5736 .recvmsg = sctp_recvmsg,
5738 .backlog_rcv = sctp_backlog_rcv,
5740 .unhash = sctp_unhash,
5741 .get_port = sctp_get_port,
5742 .obj_size = sizeof(struct sctp_sock),
5745 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5746 struct proto sctpv6_prot = {
5748 .owner = THIS_MODULE,
5749 .close = sctp_close,
5750 .connect = sctp_connect,
5751 .disconnect = sctp_disconnect,
5752 .accept = sctp_accept,
5753 .ioctl = sctp_ioctl,
5754 .init = sctp_init_sock,
5755 .destroy = sctp_destroy_sock,
5756 .shutdown = sctp_shutdown,
5757 .setsockopt = sctp_setsockopt,
5758 .getsockopt = sctp_getsockopt,
5759 .sendmsg = sctp_sendmsg,
5760 .recvmsg = sctp_recvmsg,
5762 .backlog_rcv = sctp_backlog_rcv,
5764 .unhash = sctp_unhash,
5765 .get_port = sctp_get_port,
5766 .obj_size = sizeof(struct sctp6_sock),
5768 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */