1 /* SCTP kernel 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 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 * This SCTP 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 * This SCTP 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 struct kmem_cache *sctp_bucket_cachep;
111 extern int sysctl_sctp_mem[3];
112 extern int sysctl_sctp_rmem[3];
113 extern int sysctl_sctp_wmem[3];
115 static int sctp_memory_pressure;
116 static atomic_t sctp_memory_allocated;
117 struct percpu_counter sctp_sockets_allocated;
119 static void sctp_enter_memory_pressure(struct sock *sk)
121 sctp_memory_pressure = 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association *asoc)
130 if (asoc->ep->sndbuf_policy)
131 amt = asoc->sndbuf_used;
133 amt = sk_wmem_alloc_get(asoc->base.sk);
135 if (amt >= asoc->base.sk->sk_sndbuf) {
136 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
139 amt = sk_stream_wspace(asoc->base.sk);
144 amt = asoc->base.sk->sk_sndbuf - amt;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
158 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
160 struct sctp_association *asoc = chunk->asoc;
161 struct sock *sk = asoc->base.sk;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc);
166 skb_set_owner_w(chunk->skb, sk);
168 chunk->skb->destructor = sctp_wfree;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
172 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
173 sizeof(struct sk_buff) +
174 sizeof(struct sctp_chunk);
176 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
177 sk->sk_wmem_queued += chunk->skb->truesize;
178 sk_mem_charge(sk, chunk->skb->truesize);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
187 /* Verify basic sockaddr. */
188 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
192 /* Is this a valid SCTP address? */
193 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
196 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
207 struct sctp_association *asoc = NULL;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk, UDP)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk, ESTABLISHED))
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk)->ep->asocs))
220 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
221 struct sctp_association, asocs);
225 /* Otherwise this is a UDP-style socket. */
226 if (!id || (id == (sctp_assoc_t)-1))
229 spin_lock_bh(&sctp_assocs_id_lock);
230 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
231 spin_unlock_bh(&sctp_assocs_id_lock);
233 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
243 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
244 struct sockaddr_storage *addr,
247 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
248 struct sctp_transport *transport;
249 union sctp_addr *laddr = (union sctp_addr *)addr;
251 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
258 id_asoc = sctp_id2assoc(sk, id);
259 if (id_asoc && (id_asoc != addr_asoc))
262 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
263 (union sctp_addr *)addr);
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk)->ep->base.bind_addr.port)
289 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
294 sctp_release_sock(sk);
299 static long sctp_get_port_local(struct sock *, union sctp_addr *);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
303 union sctp_addr *addr, int len)
307 /* Check minimum size. */
308 if (len < sizeof (struct sockaddr))
311 /* V4 mapped address are really of AF_INET family */
312 if (addr->sa.sa_family == AF_INET6 &&
313 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
314 if (!opt->pf->af_supported(AF_INET, opt))
317 /* Does this PF support this AF? */
318 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
322 /* If we get this far, af is valid. */
323 af = sctp_get_af_specific(addr->sa.sa_family);
325 if (len < af->sockaddr_len)
331 /* Bind a local address either to an endpoint or to an association. */
332 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
334 struct sctp_sock *sp = sctp_sk(sk);
335 struct sctp_endpoint *ep = sp->ep;
336 struct sctp_bind_addr *bp = &ep->base.bind_addr;
341 /* Common sockaddr verification. */
342 af = sctp_sockaddr_af(sp, addr, len);
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 snum = ntohs(addr->v4.sin_port);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
358 /* PF specific bind() address verification. */
359 if (!sp->pf->bind_verify(sp, addr))
360 return -EADDRNOTAVAIL;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
369 else if (snum != bp->port) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum, bp->port);
377 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
380 /* See if the address matches any of the addresses we may have
381 * already bound before checking against other endpoints.
383 if (sctp_bind_addr_match(bp, addr, sp))
386 /* Make sure we are allowed to bind here.
387 * The function sctp_get_port_local() does duplicate address
390 addr->v4.sin_port = htons(snum);
391 if ((ret = sctp_get_port_local(sk, addr))) {
395 /* Refresh ephemeral port. */
397 bp->port = inet_sk(sk)->inet_num;
399 /* Add the address to the bind address list.
400 * Use GFP_ATOMIC since BHs will be disabled.
402 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
404 /* Copy back into socket for getsockname() use. */
406 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
407 af->to_sk_saddr(addr, sk);
413 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
415 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
416 * at any one time. If a sender, after sending an ASCONF chunk, decides
417 * it needs to transfer another ASCONF Chunk, it MUST wait until the
418 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
419 * subsequent ASCONF. Note this restriction binds each side, so at any
420 * time two ASCONF may be in-transit on any given association (one sent
421 * from each endpoint).
423 static int sctp_send_asconf(struct sctp_association *asoc,
424 struct sctp_chunk *chunk)
428 /* If there is an outstanding ASCONF chunk, queue it for later
431 if (asoc->addip_last_asconf) {
432 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
436 /* Hold the chunk until an ASCONF_ACK is received. */
437 sctp_chunk_hold(chunk);
438 retval = sctp_primitive_ASCONF(asoc, chunk);
440 sctp_chunk_free(chunk);
442 asoc->addip_last_asconf = chunk;
448 /* Add a list of addresses as bind addresses to local endpoint or
451 * Basically run through each address specified in the addrs/addrcnt
452 * array/length pair, determine if it is IPv6 or IPv4 and call
453 * sctp_do_bind() on it.
455 * If any of them fails, then the operation will be reversed and the
456 * ones that were added will be removed.
458 * Only sctp_setsockopt_bindx() is supposed to call this function.
460 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
465 struct sockaddr *sa_addr;
468 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
472 for (cnt = 0; cnt < addrcnt; cnt++) {
473 /* The list may contain either IPv4 or IPv6 address;
474 * determine the address length for walking thru the list.
476 sa_addr = (struct sockaddr *)addr_buf;
477 af = sctp_get_af_specific(sa_addr->sa_family);
483 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
486 addr_buf += af->sockaddr_len;
490 /* Failed. Cleanup the ones that have been added */
492 sctp_bindx_rem(sk, addrs, cnt);
500 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
501 * associations that are part of the endpoint indicating that a list of local
502 * addresses are added to the endpoint.
504 * If any of the addresses is already in the bind address list of the
505 * association, we do not send the chunk for that association. But it will not
506 * affect other associations.
508 * Only sctp_setsockopt_bindx() is supposed to call this function.
510 static int sctp_send_asconf_add_ip(struct sock *sk,
511 struct sockaddr *addrs,
514 struct sctp_sock *sp;
515 struct sctp_endpoint *ep;
516 struct sctp_association *asoc;
517 struct sctp_bind_addr *bp;
518 struct sctp_chunk *chunk;
519 struct sctp_sockaddr_entry *laddr;
520 union sctp_addr *addr;
521 union sctp_addr saveaddr;
528 if (!sctp_addip_enable)
534 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
535 __func__, sk, addrs, addrcnt);
537 list_for_each_entry(asoc, &ep->asocs, asocs) {
539 if (!asoc->peer.asconf_capable)
542 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
545 if (!sctp_state(asoc, ESTABLISHED))
548 /* Check if any address in the packed array of addresses is
549 * in the bind address list of the association. If so,
550 * do not send the asconf chunk to its peer, but continue with
551 * other associations.
554 for (i = 0; i < addrcnt; i++) {
555 addr = (union sctp_addr *)addr_buf;
556 af = sctp_get_af_specific(addr->v4.sin_family);
562 if (sctp_assoc_lookup_laddr(asoc, addr))
565 addr_buf += af->sockaddr_len;
570 /* Use the first valid address in bind addr list of
571 * association as Address Parameter of ASCONF CHUNK.
573 bp = &asoc->base.bind_addr;
574 p = bp->address_list.next;
575 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
576 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
577 addrcnt, SCTP_PARAM_ADD_IP);
583 retval = sctp_send_asconf(asoc, chunk);
587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
591 for (i = 0; i < addrcnt; i++) {
592 addr = (union sctp_addr *)addr_buf;
593 af = sctp_get_af_specific(addr->v4.sin_family);
594 memcpy(&saveaddr, addr, af->sockaddr_len);
595 retval = sctp_add_bind_addr(bp, &saveaddr,
596 SCTP_ADDR_NEW, GFP_ATOMIC);
597 addr_buf += af->sockaddr_len;
605 /* Remove a list of addresses from bind addresses list. Do not remove the
608 * Basically run through each address specified in the addrs/addrcnt
609 * array/length pair, determine if it is IPv6 or IPv4 and call
610 * sctp_del_bind() on it.
612 * If any of them fails, then the operation will be reversed and the
613 * ones that were removed will be added back.
615 * At least one address has to be left; if only one address is
616 * available, the operation will return -EBUSY.
618 * Only sctp_setsockopt_bindx() is supposed to call this function.
620 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
622 struct sctp_sock *sp = sctp_sk(sk);
623 struct sctp_endpoint *ep = sp->ep;
625 struct sctp_bind_addr *bp = &ep->base.bind_addr;
628 union sctp_addr *sa_addr;
631 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
635 for (cnt = 0; cnt < addrcnt; cnt++) {
636 /* If the bind address list is empty or if there is only one
637 * bind address, there is nothing more to be removed (we need
638 * at least one address here).
640 if (list_empty(&bp->address_list) ||
641 (sctp_list_single_entry(&bp->address_list))) {
646 sa_addr = (union sctp_addr *)addr_buf;
647 af = sctp_get_af_specific(sa_addr->sa.sa_family);
653 if (!af->addr_valid(sa_addr, sp, NULL)) {
654 retval = -EADDRNOTAVAIL;
658 if (sa_addr->v4.sin_port != htons(bp->port)) {
663 /* FIXME - There is probably a need to check if sk->sk_saddr and
664 * sk->sk_rcv_addr are currently set to one of the addresses to
665 * be removed. This is something which needs to be looked into
666 * when we are fixing the outstanding issues with multi-homing
667 * socket routing and failover schemes. Refer to comments in
668 * sctp_do_bind(). -daisy
670 retval = sctp_del_bind_addr(bp, sa_addr);
672 addr_buf += af->sockaddr_len;
675 /* Failed. Add the ones that has been removed back */
677 sctp_bindx_add(sk, addrs, cnt);
685 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
686 * the associations that are part of the endpoint indicating that a list of
687 * local addresses are removed from the endpoint.
689 * If any of the addresses is already in the bind address list of the
690 * association, we do not send the chunk for that association. But it will not
691 * affect other associations.
693 * Only sctp_setsockopt_bindx() is supposed to call this function.
695 static int sctp_send_asconf_del_ip(struct sock *sk,
696 struct sockaddr *addrs,
699 struct sctp_sock *sp;
700 struct sctp_endpoint *ep;
701 struct sctp_association *asoc;
702 struct sctp_transport *transport;
703 struct sctp_bind_addr *bp;
704 struct sctp_chunk *chunk;
705 union sctp_addr *laddr;
708 struct sctp_sockaddr_entry *saddr;
712 if (!sctp_addip_enable)
718 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
719 __func__, sk, addrs, addrcnt);
721 list_for_each_entry(asoc, &ep->asocs, asocs) {
723 if (!asoc->peer.asconf_capable)
726 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
729 if (!sctp_state(asoc, ESTABLISHED))
732 /* Check if any address in the packed array of addresses is
733 * not present in the bind address list of the association.
734 * If so, do not send the asconf chunk to its peer, but
735 * continue with other associations.
738 for (i = 0; i < addrcnt; i++) {
739 laddr = (union sctp_addr *)addr_buf;
740 af = sctp_get_af_specific(laddr->v4.sin_family);
746 if (!sctp_assoc_lookup_laddr(asoc, laddr))
749 addr_buf += af->sockaddr_len;
754 /* Find one address in the association's bind address list
755 * that is not in the packed array of addresses. This is to
756 * make sure that we do not delete all the addresses in the
759 bp = &asoc->base.bind_addr;
760 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
765 /* We do not need RCU protection throughout this loop
766 * because this is done under a socket lock from the
769 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
776 /* Reset use_as_src flag for the addresses in the bind address
777 * list that are to be deleted.
780 for (i = 0; i < addrcnt; i++) {
781 laddr = (union sctp_addr *)addr_buf;
782 af = sctp_get_af_specific(laddr->v4.sin_family);
783 list_for_each_entry(saddr, &bp->address_list, list) {
784 if (sctp_cmp_addr_exact(&saddr->a, laddr))
785 saddr->state = SCTP_ADDR_DEL;
787 addr_buf += af->sockaddr_len;
790 /* Update the route and saddr entries for all the transports
791 * as some of the addresses in the bind address list are
792 * about to be deleted and cannot be used as source addresses.
794 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
796 dst_release(transport->dst);
797 sctp_transport_route(transport, NULL,
798 sctp_sk(asoc->base.sk));
801 retval = sctp_send_asconf(asoc, chunk);
807 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
810 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
813 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
814 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
817 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
818 * Section 3.1.2 for this usage.
820 * addrs is a pointer to an array of one or more socket addresses. Each
821 * address is contained in its appropriate structure (i.e. struct
822 * sockaddr_in or struct sockaddr_in6) the family of the address type
823 * must be used to distinguish the address length (note that this
824 * representation is termed a "packed array" of addresses). The caller
825 * specifies the number of addresses in the array with addrcnt.
827 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
828 * -1, and sets errno to the appropriate error code.
830 * For SCTP, the port given in each socket address must be the same, or
831 * sctp_bindx() will fail, setting errno to EINVAL.
833 * The flags parameter is formed from the bitwise OR of zero or more of
834 * the following currently defined flags:
836 * SCTP_BINDX_ADD_ADDR
838 * SCTP_BINDX_REM_ADDR
840 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
841 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
842 * addresses from the association. The two flags are mutually exclusive;
843 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
844 * not remove all addresses from an association; sctp_bindx() will
845 * reject such an attempt with EINVAL.
847 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
848 * additional addresses with an endpoint after calling bind(). Or use
849 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
850 * socket is associated with so that no new association accepted will be
851 * associated with those addresses. If the endpoint supports dynamic
852 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
853 * endpoint to send the appropriate message to the peer to change the
854 * peers address lists.
856 * Adding and removing addresses from a connected association is
857 * optional functionality. Implementations that do not support this
858 * functionality should return EOPNOTSUPP.
860 * Basically do nothing but copying the addresses from user to kernel
861 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
862 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
865 * We don't use copy_from_user() for optimization: we first do the
866 * sanity checks (buffer size -fast- and access check-healthy
867 * pointer); if all of those succeed, then we can alloc the memory
868 * (expensive operation) needed to copy the data to kernel. Then we do
869 * the copying without checking the user space area
870 * (__copy_from_user()).
872 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
875 * sk The sk of the socket
876 * addrs The pointer to the addresses in user land
877 * addrssize Size of the addrs buffer
878 * op Operation to perform (add or remove, see the flags of
881 * Returns 0 if ok, <0 errno code on error.
883 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
884 struct sockaddr __user *addrs,
885 int addrs_size, int op)
887 struct sockaddr *kaddrs;
891 struct sockaddr *sa_addr;
895 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
896 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
898 if (unlikely(addrs_size <= 0))
901 /* Check the user passed a healthy pointer. */
902 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
905 /* Alloc space for the address array in kernel memory. */
906 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
907 if (unlikely(!kaddrs))
910 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
915 /* Walk through the addrs buffer and count the number of addresses. */
917 while (walk_size < addrs_size) {
918 sa_addr = (struct sockaddr *)addr_buf;
919 af = sctp_get_af_specific(sa_addr->sa_family);
921 /* If the address family is not supported or if this address
922 * causes the address buffer to overflow return EINVAL.
924 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
929 addr_buf += af->sockaddr_len;
930 walk_size += af->sockaddr_len;
935 case SCTP_BINDX_ADD_ADDR:
936 err = sctp_bindx_add(sk, kaddrs, addrcnt);
939 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
942 case SCTP_BINDX_REM_ADDR:
943 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
946 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
960 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
962 * Common routine for handling connect() and sctp_connectx().
963 * Connect will come in with just a single address.
965 static int __sctp_connect(struct sock* sk,
966 struct sockaddr *kaddrs,
968 sctp_assoc_t *assoc_id)
970 struct sctp_sock *sp;
971 struct sctp_endpoint *ep;
972 struct sctp_association *asoc = NULL;
973 struct sctp_association *asoc2;
974 struct sctp_transport *transport;
982 union sctp_addr *sa_addr = NULL;
985 unsigned int f_flags = 0;
990 /* connect() cannot be done on a socket that is already in ESTABLISHED
991 * state - UDP-style peeled off socket or a TCP-style socket that
992 * is already connected.
993 * It cannot be done even on a TCP-style listening socket.
995 if (sctp_sstate(sk, ESTABLISHED) ||
996 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1001 /* Walk through the addrs buffer and count the number of addresses. */
1003 while (walk_size < addrs_size) {
1004 sa_addr = (union sctp_addr *)addr_buf;
1005 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1006 port = ntohs(sa_addr->v4.sin_port);
1008 /* If the address family is not supported or if this address
1009 * causes the address buffer to overflow return EINVAL.
1011 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1016 /* Save current address so we can work with it */
1017 memcpy(&to, sa_addr, af->sockaddr_len);
1019 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1023 /* Make sure the destination port is correctly set
1026 if (asoc && asoc->peer.port && asoc->peer.port != port)
1030 /* Check if there already is a matching association on the
1031 * endpoint (other than the one created here).
1033 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1034 if (asoc2 && asoc2 != asoc) {
1035 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1042 /* If we could not find a matching association on the endpoint,
1043 * make sure that there is no peeled-off association matching
1044 * the peer address even on another socket.
1046 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1047 err = -EADDRNOTAVAIL;
1052 /* If a bind() or sctp_bindx() is not called prior to
1053 * an sctp_connectx() call, the system picks an
1054 * ephemeral port and will choose an address set
1055 * equivalent to binding with a wildcard address.
1057 if (!ep->base.bind_addr.port) {
1058 if (sctp_autobind(sk)) {
1064 * If an unprivileged user inherits a 1-many
1065 * style socket with open associations on a
1066 * privileged port, it MAY be permitted to
1067 * accept new associations, but it SHOULD NOT
1068 * be permitted to open new associations.
1070 if (ep->base.bind_addr.port < PROT_SOCK &&
1071 !capable(CAP_NET_BIND_SERVICE)) {
1077 scope = sctp_scope(&to);
1078 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1084 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1092 /* Prime the peer's transport structures. */
1093 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1101 addr_buf += af->sockaddr_len;
1102 walk_size += af->sockaddr_len;
1105 /* In case the user of sctp_connectx() wants an association
1106 * id back, assign one now.
1109 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1114 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1119 /* Initialize sk's dport and daddr for getpeername() */
1120 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1121 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1122 af->to_sk_daddr(sa_addr, sk);
1125 /* in-kernel sockets don't generally have a file allocated to them
1126 * if all they do is call sock_create_kern().
1128 if (sk->sk_socket->file)
1129 f_flags = sk->sk_socket->file->f_flags;
1131 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1133 err = sctp_wait_for_connect(asoc, &timeo);
1134 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1135 *assoc_id = asoc->assoc_id;
1137 /* Don't free association on exit. */
1142 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1143 " kaddrs: %p err: %d\n",
1146 sctp_association_free(asoc);
1150 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1153 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1154 * sctp_assoc_t *asoc);
1156 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1157 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1158 * or IPv6 addresses.
1160 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1161 * Section 3.1.2 for this usage.
1163 * addrs is a pointer to an array of one or more socket addresses. Each
1164 * address is contained in its appropriate structure (i.e. struct
1165 * sockaddr_in or struct sockaddr_in6) the family of the address type
1166 * must be used to distengish the address length (note that this
1167 * representation is termed a "packed array" of addresses). The caller
1168 * specifies the number of addresses in the array with addrcnt.
1170 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1171 * the association id of the new association. On failure, sctp_connectx()
1172 * returns -1, and sets errno to the appropriate error code. The assoc_id
1173 * is not touched by the kernel.
1175 * For SCTP, the port given in each socket address must be the same, or
1176 * sctp_connectx() will fail, setting errno to EINVAL.
1178 * An application can use sctp_connectx to initiate an association with
1179 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1180 * allows a caller to specify multiple addresses at which a peer can be
1181 * reached. The way the SCTP stack uses the list of addresses to set up
1182 * the association is implementation dependant. This function only
1183 * specifies that the stack will try to make use of all the addresses in
1184 * the list when needed.
1186 * Note that the list of addresses passed in is only used for setting up
1187 * the association. It does not necessarily equal the set of addresses
1188 * the peer uses for the resulting association. If the caller wants to
1189 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1190 * retrieve them after the association has been set up.
1192 * Basically do nothing but copying the addresses from user to kernel
1193 * land and invoking either sctp_connectx(). This is used for tunneling
1194 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1196 * We don't use copy_from_user() for optimization: we first do the
1197 * sanity checks (buffer size -fast- and access check-healthy
1198 * pointer); if all of those succeed, then we can alloc the memory
1199 * (expensive operation) needed to copy the data to kernel. Then we do
1200 * the copying without checking the user space area
1201 * (__copy_from_user()).
1203 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1206 * sk The sk of the socket
1207 * addrs The pointer to the addresses in user land
1208 * addrssize Size of the addrs buffer
1210 * Returns >=0 if ok, <0 errno code on error.
1212 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1213 struct sockaddr __user *addrs,
1215 sctp_assoc_t *assoc_id)
1218 struct sockaddr *kaddrs;
1220 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1221 __func__, sk, addrs, addrs_size);
1223 if (unlikely(addrs_size <= 0))
1226 /* Check the user passed a healthy pointer. */
1227 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1230 /* Alloc space for the address array in kernel memory. */
1231 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1232 if (unlikely(!kaddrs))
1235 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1238 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1247 * This is an older interface. It's kept for backward compatibility
1248 * to the option that doesn't provide association id.
1250 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1251 struct sockaddr __user *addrs,
1254 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1258 * New interface for the API. The since the API is done with a socket
1259 * option, to make it simple we feed back the association id is as a return
1260 * indication to the call. Error is always negative and association id is
1263 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1264 struct sockaddr __user *addrs,
1267 sctp_assoc_t assoc_id = 0;
1270 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1279 * New (hopefully final) interface for the API.
1280 * We use the sctp_getaddrs_old structure so that use-space library
1281 * can avoid any unnecessary allocations. The only defferent part
1282 * is that we store the actual length of the address buffer into the
1283 * addrs_num structure member. That way we can re-use the existing
1286 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1287 char __user *optval,
1290 struct sctp_getaddrs_old param;
1291 sctp_assoc_t assoc_id = 0;
1294 if (len < sizeof(param))
1297 if (copy_from_user(¶m, optval, sizeof(param)))
1300 err = __sctp_setsockopt_connectx(sk,
1301 (struct sockaddr __user *)param.addrs,
1302 param.addr_num, &assoc_id);
1304 if (err == 0 || err == -EINPROGRESS) {
1305 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1307 if (put_user(sizeof(assoc_id), optlen))
1314 /* API 3.1.4 close() - UDP Style Syntax
1315 * Applications use close() to perform graceful shutdown (as described in
1316 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1317 * by a UDP-style socket.
1321 * ret = close(int sd);
1323 * sd - the socket descriptor of the associations to be closed.
1325 * To gracefully shutdown a specific association represented by the
1326 * UDP-style socket, an application should use the sendmsg() call,
1327 * passing no user data, but including the appropriate flag in the
1328 * ancillary data (see Section xxxx).
1330 * If sd in the close() call is a branched-off socket representing only
1331 * one association, the shutdown is performed on that association only.
1333 * 4.1.6 close() - TCP Style Syntax
1335 * Applications use close() to gracefully close down an association.
1339 * int close(int sd);
1341 * sd - the socket descriptor of the association to be closed.
1343 * After an application calls close() on a socket descriptor, no further
1344 * socket operations will succeed on that descriptor.
1346 * API 7.1.4 SO_LINGER
1348 * An application using the TCP-style socket can use this option to
1349 * perform the SCTP ABORT primitive. The linger option structure is:
1352 * int l_onoff; // option on/off
1353 * int l_linger; // linger time
1356 * To enable the option, set l_onoff to 1. If the l_linger value is set
1357 * to 0, calling close() is the same as the ABORT primitive. If the
1358 * value is set to a negative value, the setsockopt() call will return
1359 * an error. If the value is set to a positive value linger_time, the
1360 * close() can be blocked for at most linger_time ms. If the graceful
1361 * shutdown phase does not finish during this period, close() will
1362 * return but the graceful shutdown phase continues in the system.
1364 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1366 struct sctp_endpoint *ep;
1367 struct sctp_association *asoc;
1368 struct list_head *pos, *temp;
1370 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1373 sk->sk_shutdown = SHUTDOWN_MASK;
1374 sk->sk_state = SCTP_SS_CLOSING;
1376 ep = sctp_sk(sk)->ep;
1378 /* Walk all associations on an endpoint. */
1379 list_for_each_safe(pos, temp, &ep->asocs) {
1380 asoc = list_entry(pos, struct sctp_association, asocs);
1382 if (sctp_style(sk, TCP)) {
1383 /* A closed association can still be in the list if
1384 * it belongs to a TCP-style listening socket that is
1385 * not yet accepted. If so, free it. If not, send an
1386 * ABORT or SHUTDOWN based on the linger options.
1388 if (sctp_state(asoc, CLOSED)) {
1389 sctp_unhash_established(asoc);
1390 sctp_association_free(asoc);
1395 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1396 struct sctp_chunk *chunk;
1398 chunk = sctp_make_abort_user(asoc, NULL, 0);
1400 sctp_primitive_ABORT(asoc, chunk);
1402 sctp_primitive_SHUTDOWN(asoc, NULL);
1405 /* Clean up any skbs sitting on the receive queue. */
1406 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1407 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1409 /* On a TCP-style socket, block for at most linger_time if set. */
1410 if (sctp_style(sk, TCP) && timeout)
1411 sctp_wait_for_close(sk, timeout);
1413 /* This will run the backlog queue. */
1414 sctp_release_sock(sk);
1416 /* Supposedly, no process has access to the socket, but
1417 * the net layers still may.
1419 sctp_local_bh_disable();
1420 sctp_bh_lock_sock(sk);
1422 /* Hold the sock, since sk_common_release() will put sock_put()
1423 * and we have just a little more cleanup.
1426 sk_common_release(sk);
1428 sctp_bh_unlock_sock(sk);
1429 sctp_local_bh_enable();
1433 SCTP_DBG_OBJCNT_DEC(sock);
1436 /* Handle EPIPE error. */
1437 static int sctp_error(struct sock *sk, int flags, int err)
1440 err = sock_error(sk) ? : -EPIPE;
1441 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1442 send_sig(SIGPIPE, current, 0);
1446 /* API 3.1.3 sendmsg() - UDP Style Syntax
1448 * An application uses sendmsg() and recvmsg() calls to transmit data to
1449 * and receive data from its peer.
1451 * ssize_t sendmsg(int socket, const struct msghdr *message,
1454 * socket - the socket descriptor of the endpoint.
1455 * message - pointer to the msghdr structure which contains a single
1456 * user message and possibly some ancillary data.
1458 * See Section 5 for complete description of the data
1461 * flags - flags sent or received with the user message, see Section
1462 * 5 for complete description of the flags.
1464 * Note: This function could use a rewrite especially when explicit
1465 * connect support comes in.
1467 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1469 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1471 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1472 struct msghdr *msg, size_t msg_len)
1474 struct sctp_sock *sp;
1475 struct sctp_endpoint *ep;
1476 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1477 struct sctp_transport *transport, *chunk_tp;
1478 struct sctp_chunk *chunk;
1480 struct sockaddr *msg_name = NULL;
1481 struct sctp_sndrcvinfo default_sinfo = { 0 };
1482 struct sctp_sndrcvinfo *sinfo;
1483 struct sctp_initmsg *sinit;
1484 sctp_assoc_t associd = 0;
1485 sctp_cmsgs_t cmsgs = { NULL };
1489 __u16 sinfo_flags = 0;
1490 struct sctp_datamsg *datamsg;
1491 int msg_flags = msg->msg_flags;
1493 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1500 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1502 /* We cannot send a message over a TCP-style listening socket. */
1503 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1508 /* Parse out the SCTP CMSGs. */
1509 err = sctp_msghdr_parse(msg, &cmsgs);
1512 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1516 /* Fetch the destination address for this packet. This
1517 * address only selects the association--it is not necessarily
1518 * the address we will send to.
1519 * For a peeled-off socket, msg_name is ignored.
1521 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1522 int msg_namelen = msg->msg_namelen;
1524 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1529 if (msg_namelen > sizeof(to))
1530 msg_namelen = sizeof(to);
1531 memcpy(&to, msg->msg_name, msg_namelen);
1532 msg_name = msg->msg_name;
1538 /* Did the user specify SNDRCVINFO? */
1540 sinfo_flags = sinfo->sinfo_flags;
1541 associd = sinfo->sinfo_assoc_id;
1544 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1545 msg_len, sinfo_flags);
1547 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1548 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1553 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1554 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1555 * If SCTP_ABORT is set, the message length could be non zero with
1556 * the msg_iov set to the user abort reason.
1558 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1559 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1564 /* If SCTP_ADDR_OVER is set, there must be an address
1565 * specified in msg_name.
1567 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1574 SCTP_DEBUG_PRINTK("About to look up association.\n");
1578 /* If a msg_name has been specified, assume this is to be used. */
1580 /* Look for a matching association on the endpoint. */
1581 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1583 /* If we could not find a matching association on the
1584 * endpoint, make sure that it is not a TCP-style
1585 * socket that already has an association or there is
1586 * no peeled-off association on another socket.
1588 if ((sctp_style(sk, TCP) &&
1589 sctp_sstate(sk, ESTABLISHED)) ||
1590 sctp_endpoint_is_peeled_off(ep, &to)) {
1591 err = -EADDRNOTAVAIL;
1596 asoc = sctp_id2assoc(sk, associd);
1604 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1606 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1607 * socket that has an association in CLOSED state. This can
1608 * happen when an accepted socket has an association that is
1611 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1616 if (sinfo_flags & SCTP_EOF) {
1617 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1619 sctp_primitive_SHUTDOWN(asoc, NULL);
1623 if (sinfo_flags & SCTP_ABORT) {
1625 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1631 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1632 sctp_primitive_ABORT(asoc, chunk);
1638 /* Do we need to create the association? */
1640 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1642 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1647 /* Check for invalid stream against the stream counts,
1648 * either the default or the user specified stream counts.
1651 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1652 /* Check against the defaults. */
1653 if (sinfo->sinfo_stream >=
1654 sp->initmsg.sinit_num_ostreams) {
1659 /* Check against the requested. */
1660 if (sinfo->sinfo_stream >=
1661 sinit->sinit_num_ostreams) {
1669 * API 3.1.2 bind() - UDP Style Syntax
1670 * If a bind() or sctp_bindx() is not called prior to a
1671 * sendmsg() call that initiates a new association, the
1672 * system picks an ephemeral port and will choose an address
1673 * set equivalent to binding with a wildcard address.
1675 if (!ep->base.bind_addr.port) {
1676 if (sctp_autobind(sk)) {
1682 * If an unprivileged user inherits a one-to-many
1683 * style socket with open associations on a privileged
1684 * port, it MAY be permitted to accept new associations,
1685 * but it SHOULD NOT be permitted to open new
1688 if (ep->base.bind_addr.port < PROT_SOCK &&
1689 !capable(CAP_NET_BIND_SERVICE)) {
1695 scope = sctp_scope(&to);
1696 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1702 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1708 /* If the SCTP_INIT ancillary data is specified, set all
1709 * the association init values accordingly.
1712 if (sinit->sinit_num_ostreams) {
1713 asoc->c.sinit_num_ostreams =
1714 sinit->sinit_num_ostreams;
1716 if (sinit->sinit_max_instreams) {
1717 asoc->c.sinit_max_instreams =
1718 sinit->sinit_max_instreams;
1720 if (sinit->sinit_max_attempts) {
1721 asoc->max_init_attempts
1722 = sinit->sinit_max_attempts;
1724 if (sinit->sinit_max_init_timeo) {
1725 asoc->max_init_timeo =
1726 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1730 /* Prime the peer's transport structures. */
1731 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1738 /* ASSERT: we have a valid association at this point. */
1739 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1742 /* If the user didn't specify SNDRCVINFO, make up one with
1745 default_sinfo.sinfo_stream = asoc->default_stream;
1746 default_sinfo.sinfo_flags = asoc->default_flags;
1747 default_sinfo.sinfo_ppid = asoc->default_ppid;
1748 default_sinfo.sinfo_context = asoc->default_context;
1749 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1750 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1751 sinfo = &default_sinfo;
1754 /* API 7.1.7, the sndbuf size per association bounds the
1755 * maximum size of data that can be sent in a single send call.
1757 if (msg_len > sk->sk_sndbuf) {
1762 if (asoc->pmtu_pending)
1763 sctp_assoc_pending_pmtu(asoc);
1765 /* If fragmentation is disabled and the message length exceeds the
1766 * association fragmentation point, return EMSGSIZE. The I-D
1767 * does not specify what this error is, but this looks like
1770 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1776 /* Check for invalid stream. */
1777 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1783 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1784 if (!sctp_wspace(asoc)) {
1785 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1790 /* If an address is passed with the sendto/sendmsg call, it is used
1791 * to override the primary destination address in the TCP model, or
1792 * when SCTP_ADDR_OVER flag is set in the UDP model.
1794 if ((sctp_style(sk, TCP) && msg_name) ||
1795 (sinfo_flags & SCTP_ADDR_OVER)) {
1796 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1804 /* Auto-connect, if we aren't connected already. */
1805 if (sctp_state(asoc, CLOSED)) {
1806 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1809 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1812 /* Break the message into multiple chunks of maximum size. */
1813 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1819 /* Now send the (possibly) fragmented message. */
1820 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1821 sctp_chunk_hold(chunk);
1823 /* Do accounting for the write space. */
1824 sctp_set_owner_w(chunk);
1826 chunk->transport = chunk_tp;
1829 /* Send it to the lower layers. Note: all chunks
1830 * must either fail or succeed. The lower layer
1831 * works that way today. Keep it that way or this
1834 err = sctp_primitive_SEND(asoc, datamsg);
1835 /* Did the lower layer accept the chunk? */
1837 sctp_datamsg_free(datamsg);
1839 sctp_datamsg_put(datamsg);
1841 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1848 /* If we are already past ASSOCIATE, the lower
1849 * layers are responsible for association cleanup.
1855 sctp_association_free(asoc);
1857 sctp_release_sock(sk);
1860 return sctp_error(sk, msg_flags, err);
1867 err = sock_error(sk);
1877 /* This is an extended version of skb_pull() that removes the data from the
1878 * start of a skb even when data is spread across the list of skb's in the
1879 * frag_list. len specifies the total amount of data that needs to be removed.
1880 * when 'len' bytes could be removed from the skb, it returns 0.
1881 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1882 * could not be removed.
1884 static int sctp_skb_pull(struct sk_buff *skb, int len)
1886 struct sk_buff *list;
1887 int skb_len = skb_headlen(skb);
1890 if (len <= skb_len) {
1891 __skb_pull(skb, len);
1895 __skb_pull(skb, skb_len);
1897 skb_walk_frags(skb, list) {
1898 rlen = sctp_skb_pull(list, len);
1899 skb->len -= (len-rlen);
1900 skb->data_len -= (len-rlen);
1911 /* API 3.1.3 recvmsg() - UDP Style Syntax
1913 * ssize_t recvmsg(int socket, struct msghdr *message,
1916 * socket - the socket descriptor of the endpoint.
1917 * message - pointer to the msghdr structure which contains a single
1918 * user message and possibly some ancillary data.
1920 * See Section 5 for complete description of the data
1923 * flags - flags sent or received with the user message, see Section
1924 * 5 for complete description of the flags.
1926 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1928 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1929 struct msghdr *msg, size_t len, int noblock,
1930 int flags, int *addr_len)
1932 struct sctp_ulpevent *event = NULL;
1933 struct sctp_sock *sp = sctp_sk(sk);
1934 struct sk_buff *skb;
1939 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1940 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1941 "len", len, "knoblauch", noblock,
1942 "flags", flags, "addr_len", addr_len);
1946 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1951 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1955 /* Get the total length of the skb including any skb's in the
1964 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1966 event = sctp_skb2event(skb);
1971 sock_recv_ts_and_drops(msg, sk, skb);
1972 if (sctp_ulpevent_is_notification(event)) {
1973 msg->msg_flags |= MSG_NOTIFICATION;
1974 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1976 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1979 /* Check if we allow SCTP_SNDRCVINFO. */
1980 if (sp->subscribe.sctp_data_io_event)
1981 sctp_ulpevent_read_sndrcvinfo(event, msg);
1983 /* FIXME: we should be calling IP/IPv6 layers. */
1984 if (sk->sk_protinfo.af_inet.cmsg_flags)
1985 ip_cmsg_recv(msg, skb);
1990 /* If skb's length exceeds the user's buffer, update the skb and
1991 * push it back to the receive_queue so that the next call to
1992 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1994 if (skb_len > copied) {
1995 msg->msg_flags &= ~MSG_EOR;
1996 if (flags & MSG_PEEK)
1998 sctp_skb_pull(skb, copied);
1999 skb_queue_head(&sk->sk_receive_queue, skb);
2001 /* When only partial message is copied to the user, increase
2002 * rwnd by that amount. If all the data in the skb is read,
2003 * rwnd is updated when the event is freed.
2005 if (!sctp_ulpevent_is_notification(event))
2006 sctp_assoc_rwnd_increase(event->asoc, copied);
2008 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2009 (event->msg_flags & MSG_EOR))
2010 msg->msg_flags |= MSG_EOR;
2012 msg->msg_flags &= ~MSG_EOR;
2015 if (flags & MSG_PEEK) {
2016 /* Release the skb reference acquired after peeking the skb in
2017 * sctp_skb_recv_datagram().
2021 /* Free the event which includes releasing the reference to
2022 * the owner of the skb, freeing the skb and updating the
2025 sctp_ulpevent_free(event);
2028 sctp_release_sock(sk);
2032 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2034 * This option is a on/off flag. If enabled no SCTP message
2035 * fragmentation will be performed. Instead if a message being sent
2036 * exceeds the current PMTU size, the message will NOT be sent and
2037 * instead a error will be indicated to the user.
2039 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2040 char __user *optval,
2041 unsigned int optlen)
2045 if (optlen < sizeof(int))
2048 if (get_user(val, (int __user *)optval))
2051 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2056 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2057 unsigned int optlen)
2059 if (optlen > sizeof(struct sctp_event_subscribe))
2061 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2066 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2068 * This socket option is applicable to the UDP-style socket only. When
2069 * set it will cause associations that are idle for more than the
2070 * specified number of seconds to automatically close. An association
2071 * being idle is defined an association that has NOT sent or received
2072 * user data. The special value of '0' indicates that no automatic
2073 * close of any associations should be performed. The option expects an
2074 * integer defining the number of seconds of idle time before an
2075 * association is closed.
2077 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2078 unsigned int optlen)
2080 struct sctp_sock *sp = sctp_sk(sk);
2082 /* Applicable to UDP-style socket only */
2083 if (sctp_style(sk, TCP))
2085 if (optlen != sizeof(int))
2087 if (copy_from_user(&sp->autoclose, optval, optlen))
2093 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2095 * Applications can enable or disable heartbeats for any peer address of
2096 * an association, modify an address's heartbeat interval, force a
2097 * heartbeat to be sent immediately, and adjust the address's maximum
2098 * number of retransmissions sent before an address is considered
2099 * unreachable. The following structure is used to access and modify an
2100 * address's parameters:
2102 * struct sctp_paddrparams {
2103 * sctp_assoc_t spp_assoc_id;
2104 * struct sockaddr_storage spp_address;
2105 * uint32_t spp_hbinterval;
2106 * uint16_t spp_pathmaxrxt;
2107 * uint32_t spp_pathmtu;
2108 * uint32_t spp_sackdelay;
2109 * uint32_t spp_flags;
2112 * spp_assoc_id - (one-to-many style socket) This is filled in the
2113 * application, and identifies the association for
2115 * spp_address - This specifies which address is of interest.
2116 * spp_hbinterval - This contains the value of the heartbeat interval,
2117 * in milliseconds. If a value of zero
2118 * is present in this field then no changes are to
2119 * be made to this parameter.
2120 * spp_pathmaxrxt - This contains the maximum number of
2121 * retransmissions before this address shall be
2122 * considered unreachable. If a value of zero
2123 * is present in this field then no changes are to
2124 * be made to this parameter.
2125 * spp_pathmtu - When Path MTU discovery is disabled the value
2126 * specified here will be the "fixed" path mtu.
2127 * Note that if the spp_address field is empty
2128 * then all associations on this address will
2129 * have this fixed path mtu set upon them.
2131 * spp_sackdelay - When delayed sack is enabled, this value specifies
2132 * the number of milliseconds that sacks will be delayed
2133 * for. This value will apply to all addresses of an
2134 * association if the spp_address field is empty. Note
2135 * also, that if delayed sack is enabled and this
2136 * value is set to 0, no change is made to the last
2137 * recorded delayed sack timer value.
2139 * spp_flags - These flags are used to control various features
2140 * on an association. The flag field may contain
2141 * zero or more of the following options.
2143 * SPP_HB_ENABLE - Enable heartbeats on the
2144 * specified address. Note that if the address
2145 * field is empty all addresses for the association
2146 * have heartbeats enabled upon them.
2148 * SPP_HB_DISABLE - Disable heartbeats on the
2149 * speicifed address. Note that if the address
2150 * field is empty all addresses for the association
2151 * will have their heartbeats disabled. Note also
2152 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2153 * mutually exclusive, only one of these two should
2154 * be specified. Enabling both fields will have
2155 * undetermined results.
2157 * SPP_HB_DEMAND - Request a user initiated heartbeat
2158 * to be made immediately.
2160 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2161 * heartbeat delayis to be set to the value of 0
2164 * SPP_PMTUD_ENABLE - This field will enable PMTU
2165 * discovery upon the specified address. Note that
2166 * if the address feild is empty then all addresses
2167 * on the association are effected.
2169 * SPP_PMTUD_DISABLE - This field will disable PMTU
2170 * discovery upon the specified address. Note that
2171 * if the address feild is empty then all addresses
2172 * on the association are effected. Not also that
2173 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2174 * exclusive. Enabling both will have undetermined
2177 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2178 * on delayed sack. The time specified in spp_sackdelay
2179 * is used to specify the sack delay for this address. Note
2180 * that if spp_address is empty then all addresses will
2181 * enable delayed sack and take on the sack delay
2182 * value specified in spp_sackdelay.
2183 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2184 * off delayed sack. If the spp_address field is blank then
2185 * delayed sack is disabled for the entire association. Note
2186 * also that this field is mutually exclusive to
2187 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2190 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2191 struct sctp_transport *trans,
2192 struct sctp_association *asoc,
2193 struct sctp_sock *sp,
2196 int sackdelay_change)
2200 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2201 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2206 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2207 * this field is ignored. Note also that a value of zero indicates
2208 * the current setting should be left unchanged.
2210 if (params->spp_flags & SPP_HB_ENABLE) {
2212 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2213 * set. This lets us use 0 value when this flag
2216 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2217 params->spp_hbinterval = 0;
2219 if (params->spp_hbinterval ||
2220 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2223 msecs_to_jiffies(params->spp_hbinterval);
2226 msecs_to_jiffies(params->spp_hbinterval);
2228 sp->hbinterval = params->spp_hbinterval;
2235 trans->param_flags =
2236 (trans->param_flags & ~SPP_HB) | hb_change;
2239 (asoc->param_flags & ~SPP_HB) | hb_change;
2242 (sp->param_flags & ~SPP_HB) | hb_change;
2246 /* When Path MTU discovery is disabled the value specified here will
2247 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2248 * include the flag SPP_PMTUD_DISABLE for this field to have any
2251 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2253 trans->pathmtu = params->spp_pathmtu;
2254 sctp_assoc_sync_pmtu(asoc);
2256 asoc->pathmtu = params->spp_pathmtu;
2257 sctp_frag_point(asoc, params->spp_pathmtu);
2259 sp->pathmtu = params->spp_pathmtu;
2265 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2266 (params->spp_flags & SPP_PMTUD_ENABLE);
2267 trans->param_flags =
2268 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2270 sctp_transport_pmtu(trans);
2271 sctp_assoc_sync_pmtu(asoc);
2275 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2278 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2282 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2283 * value of this field is ignored. Note also that a value of zero
2284 * indicates the current setting should be left unchanged.
2286 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2289 msecs_to_jiffies(params->spp_sackdelay);
2292 msecs_to_jiffies(params->spp_sackdelay);
2294 sp->sackdelay = params->spp_sackdelay;
2298 if (sackdelay_change) {
2300 trans->param_flags =
2301 (trans->param_flags & ~SPP_SACKDELAY) |
2305 (asoc->param_flags & ~SPP_SACKDELAY) |
2309 (sp->param_flags & ~SPP_SACKDELAY) |
2314 /* Note that a value of zero indicates the current setting should be
2317 if (params->spp_pathmaxrxt) {
2319 trans->pathmaxrxt = params->spp_pathmaxrxt;
2321 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2323 sp->pathmaxrxt = params->spp_pathmaxrxt;
2330 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2331 char __user *optval,
2332 unsigned int optlen)
2334 struct sctp_paddrparams params;
2335 struct sctp_transport *trans = NULL;
2336 struct sctp_association *asoc = NULL;
2337 struct sctp_sock *sp = sctp_sk(sk);
2339 int hb_change, pmtud_change, sackdelay_change;
2341 if (optlen != sizeof(struct sctp_paddrparams))
2344 if (copy_from_user(¶ms, optval, optlen))
2347 /* Validate flags and value parameters. */
2348 hb_change = params.spp_flags & SPP_HB;
2349 pmtud_change = params.spp_flags & SPP_PMTUD;
2350 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2352 if (hb_change == SPP_HB ||
2353 pmtud_change == SPP_PMTUD ||
2354 sackdelay_change == SPP_SACKDELAY ||
2355 params.spp_sackdelay > 500 ||
2357 && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2360 /* If an address other than INADDR_ANY is specified, and
2361 * no transport is found, then the request is invalid.
2363 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2364 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2365 params.spp_assoc_id);
2370 /* Get association, if assoc_id != 0 and the socket is a one
2371 * to many style socket, and an association was not found, then
2372 * the id was invalid.
2374 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2375 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2378 /* Heartbeat demand can only be sent on a transport or
2379 * association, but not a socket.
2381 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2384 /* Process parameters. */
2385 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2386 hb_change, pmtud_change,
2392 /* If changes are for association, also apply parameters to each
2395 if (!trans && asoc) {
2396 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2398 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2399 hb_change, pmtud_change,
2408 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2410 * This option will effect the way delayed acks are performed. This
2411 * option allows you to get or set the delayed ack time, in
2412 * milliseconds. It also allows changing the delayed ack frequency.
2413 * Changing the frequency to 1 disables the delayed sack algorithm. If
2414 * the assoc_id is 0, then this sets or gets the endpoints default
2415 * values. If the assoc_id field is non-zero, then the set or get
2416 * effects the specified association for the one to many model (the
2417 * assoc_id field is ignored by the one to one model). Note that if
2418 * sack_delay or sack_freq are 0 when setting this option, then the
2419 * current values will remain unchanged.
2421 * struct sctp_sack_info {
2422 * sctp_assoc_t sack_assoc_id;
2423 * uint32_t sack_delay;
2424 * uint32_t sack_freq;
2427 * sack_assoc_id - This parameter, indicates which association the user
2428 * is performing an action upon. Note that if this field's value is
2429 * zero then the endpoints default value is changed (effecting future
2430 * associations only).
2432 * sack_delay - This parameter contains the number of milliseconds that
2433 * the user is requesting the delayed ACK timer be set to. Note that
2434 * this value is defined in the standard to be between 200 and 500
2437 * sack_freq - This parameter contains the number of packets that must
2438 * be received before a sack is sent without waiting for the delay
2439 * timer to expire. The default value for this is 2, setting this
2440 * value to 1 will disable the delayed sack algorithm.
2443 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2444 char __user *optval, unsigned int optlen)
2446 struct sctp_sack_info params;
2447 struct sctp_transport *trans = NULL;
2448 struct sctp_association *asoc = NULL;
2449 struct sctp_sock *sp = sctp_sk(sk);
2451 if (optlen == sizeof(struct sctp_sack_info)) {
2452 if (copy_from_user(¶ms, optval, optlen))
2455 if (params.sack_delay == 0 && params.sack_freq == 0)
2457 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2458 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
2459 "in delayed_ack socket option deprecated\n");
2460 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
2461 if (copy_from_user(¶ms, optval, optlen))
2464 if (params.sack_delay == 0)
2465 params.sack_freq = 1;
2467 params.sack_freq = 0;
2471 /* Validate value parameter. */
2472 if (params.sack_delay > 500)
2475 /* Get association, if sack_assoc_id != 0 and the socket is a one
2476 * to many style socket, and an association was not found, then
2477 * the id was invalid.
2479 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2480 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2483 if (params.sack_delay) {
2486 msecs_to_jiffies(params.sack_delay);
2488 (asoc->param_flags & ~SPP_SACKDELAY) |
2489 SPP_SACKDELAY_ENABLE;
2491 sp->sackdelay = params.sack_delay;
2493 (sp->param_flags & ~SPP_SACKDELAY) |
2494 SPP_SACKDELAY_ENABLE;
2498 if (params.sack_freq == 1) {
2501 (asoc->param_flags & ~SPP_SACKDELAY) |
2502 SPP_SACKDELAY_DISABLE;
2505 (sp->param_flags & ~SPP_SACKDELAY) |
2506 SPP_SACKDELAY_DISABLE;
2508 } else if (params.sack_freq > 1) {
2510 asoc->sackfreq = params.sack_freq;
2512 (asoc->param_flags & ~SPP_SACKDELAY) |
2513 SPP_SACKDELAY_ENABLE;
2515 sp->sackfreq = params.sack_freq;
2517 (sp->param_flags & ~SPP_SACKDELAY) |
2518 SPP_SACKDELAY_ENABLE;
2522 /* If change is for association, also apply to each transport. */
2524 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2526 if (params.sack_delay) {
2528 msecs_to_jiffies(params.sack_delay);
2529 trans->param_flags =
2530 (trans->param_flags & ~SPP_SACKDELAY) |
2531 SPP_SACKDELAY_ENABLE;
2533 if (params.sack_freq == 1) {
2534 trans->param_flags =
2535 (trans->param_flags & ~SPP_SACKDELAY) |
2536 SPP_SACKDELAY_DISABLE;
2537 } else if (params.sack_freq > 1) {
2538 trans->sackfreq = params.sack_freq;
2539 trans->param_flags =
2540 (trans->param_flags & ~SPP_SACKDELAY) |
2541 SPP_SACKDELAY_ENABLE;
2549 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2551 * Applications can specify protocol parameters for the default association
2552 * initialization. The option name argument to setsockopt() and getsockopt()
2555 * Setting initialization parameters is effective only on an unconnected
2556 * socket (for UDP-style sockets only future associations are effected
2557 * by the change). With TCP-style sockets, this option is inherited by
2558 * sockets derived from a listener socket.
2560 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2562 struct sctp_initmsg sinit;
2563 struct sctp_sock *sp = sctp_sk(sk);
2565 if (optlen != sizeof(struct sctp_initmsg))
2567 if (copy_from_user(&sinit, optval, optlen))
2570 if (sinit.sinit_num_ostreams)
2571 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2572 if (sinit.sinit_max_instreams)
2573 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2574 if (sinit.sinit_max_attempts)
2575 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2576 if (sinit.sinit_max_init_timeo)
2577 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2583 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2585 * Applications that wish to use the sendto() system call may wish to
2586 * specify a default set of parameters that would normally be supplied
2587 * through the inclusion of ancillary data. This socket option allows
2588 * such an application to set the default sctp_sndrcvinfo structure.
2589 * The application that wishes to use this socket option simply passes
2590 * in to this call the sctp_sndrcvinfo structure defined in Section
2591 * 5.2.2) The input parameters accepted by this call include
2592 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2593 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2594 * to this call if the caller is using the UDP model.
2596 static int sctp_setsockopt_default_send_param(struct sock *sk,
2597 char __user *optval,
2598 unsigned int optlen)
2600 struct sctp_sndrcvinfo info;
2601 struct sctp_association *asoc;
2602 struct sctp_sock *sp = sctp_sk(sk);
2604 if (optlen != sizeof(struct sctp_sndrcvinfo))
2606 if (copy_from_user(&info, optval, optlen))
2609 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2610 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2614 asoc->default_stream = info.sinfo_stream;
2615 asoc->default_flags = info.sinfo_flags;
2616 asoc->default_ppid = info.sinfo_ppid;
2617 asoc->default_context = info.sinfo_context;
2618 asoc->default_timetolive = info.sinfo_timetolive;
2620 sp->default_stream = info.sinfo_stream;
2621 sp->default_flags = info.sinfo_flags;
2622 sp->default_ppid = info.sinfo_ppid;
2623 sp->default_context = info.sinfo_context;
2624 sp->default_timetolive = info.sinfo_timetolive;
2630 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2632 * Requests that the local SCTP stack use the enclosed peer address as
2633 * the association primary. The enclosed address must be one of the
2634 * association peer's addresses.
2636 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2637 unsigned int optlen)
2639 struct sctp_prim prim;
2640 struct sctp_transport *trans;
2642 if (optlen != sizeof(struct sctp_prim))
2645 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2648 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2652 sctp_assoc_set_primary(trans->asoc, trans);
2658 * 7.1.5 SCTP_NODELAY
2660 * Turn on/off any Nagle-like algorithm. This means that packets are
2661 * generally sent as soon as possible and no unnecessary delays are
2662 * introduced, at the cost of more packets in the network. Expects an
2663 * integer boolean flag.
2665 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2666 unsigned int optlen)
2670 if (optlen < sizeof(int))
2672 if (get_user(val, (int __user *)optval))
2675 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2681 * 7.1.1 SCTP_RTOINFO
2683 * The protocol parameters used to initialize and bound retransmission
2684 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2685 * and modify these parameters.
2686 * All parameters are time values, in milliseconds. A value of 0, when
2687 * modifying the parameters, indicates that the current value should not
2691 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2693 struct sctp_rtoinfo rtoinfo;
2694 struct sctp_association *asoc;
2696 if (optlen != sizeof (struct sctp_rtoinfo))
2699 if (copy_from_user(&rtoinfo, optval, optlen))
2702 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2704 /* Set the values to the specific association */
2705 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2709 if (rtoinfo.srto_initial != 0)
2711 msecs_to_jiffies(rtoinfo.srto_initial);
2712 if (rtoinfo.srto_max != 0)
2713 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2714 if (rtoinfo.srto_min != 0)
2715 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2717 /* If there is no association or the association-id = 0
2718 * set the values to the endpoint.
2720 struct sctp_sock *sp = sctp_sk(sk);
2722 if (rtoinfo.srto_initial != 0)
2723 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2724 if (rtoinfo.srto_max != 0)
2725 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2726 if (rtoinfo.srto_min != 0)
2727 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2735 * 7.1.2 SCTP_ASSOCINFO
2737 * This option is used to tune the maximum retransmission attempts
2738 * of the association.
2739 * Returns an error if the new association retransmission value is
2740 * greater than the sum of the retransmission value of the peer.
2741 * See [SCTP] for more information.
2744 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2747 struct sctp_assocparams assocparams;
2748 struct sctp_association *asoc;
2750 if (optlen != sizeof(struct sctp_assocparams))
2752 if (copy_from_user(&assocparams, optval, optlen))
2755 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2757 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2760 /* Set the values to the specific association */
2762 if (assocparams.sasoc_asocmaxrxt != 0) {
2765 struct sctp_transport *peer_addr;
2767 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2769 path_sum += peer_addr->pathmaxrxt;
2773 /* Only validate asocmaxrxt if we have more than
2774 * one path/transport. We do this because path
2775 * retransmissions are only counted when we have more
2779 assocparams.sasoc_asocmaxrxt > path_sum)
2782 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2785 if (assocparams.sasoc_cookie_life != 0) {
2786 asoc->cookie_life.tv_sec =
2787 assocparams.sasoc_cookie_life / 1000;
2788 asoc->cookie_life.tv_usec =
2789 (assocparams.sasoc_cookie_life % 1000)
2793 /* Set the values to the endpoint */
2794 struct sctp_sock *sp = sctp_sk(sk);
2796 if (assocparams.sasoc_asocmaxrxt != 0)
2797 sp->assocparams.sasoc_asocmaxrxt =
2798 assocparams.sasoc_asocmaxrxt;
2799 if (assocparams.sasoc_cookie_life != 0)
2800 sp->assocparams.sasoc_cookie_life =
2801 assocparams.sasoc_cookie_life;
2807 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2809 * This socket option is a boolean flag which turns on or off mapped V4
2810 * addresses. If this option is turned on and the socket is type
2811 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2812 * If this option is turned off, then no mapping will be done of V4
2813 * addresses and a user will receive both PF_INET6 and PF_INET type
2814 * addresses on the socket.
2816 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2819 struct sctp_sock *sp = sctp_sk(sk);
2821 if (optlen < sizeof(int))
2823 if (get_user(val, (int __user *)optval))
2834 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2835 * This option will get or set the maximum size to put in any outgoing
2836 * SCTP DATA chunk. If a message is larger than this size it will be
2837 * fragmented by SCTP into the specified size. Note that the underlying
2838 * SCTP implementation may fragment into smaller sized chunks when the
2839 * PMTU of the underlying association is smaller than the value set by
2840 * the user. The default value for this option is '0' which indicates
2841 * the user is NOT limiting fragmentation and only the PMTU will effect
2842 * SCTP's choice of DATA chunk size. Note also that values set larger
2843 * than the maximum size of an IP datagram will effectively let SCTP
2844 * control fragmentation (i.e. the same as setting this option to 0).
2846 * The following structure is used to access and modify this parameter:
2848 * struct sctp_assoc_value {
2849 * sctp_assoc_t assoc_id;
2850 * uint32_t assoc_value;
2853 * assoc_id: This parameter is ignored for one-to-one style sockets.
2854 * For one-to-many style sockets this parameter indicates which
2855 * association the user is performing an action upon. Note that if
2856 * this field's value is zero then the endpoints default value is
2857 * changed (effecting future associations only).
2858 * assoc_value: This parameter specifies the maximum size in bytes.
2860 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2862 struct sctp_assoc_value params;
2863 struct sctp_association *asoc;
2864 struct sctp_sock *sp = sctp_sk(sk);
2867 if (optlen == sizeof(int)) {
2869 "SCTP: Use of int in maxseg socket option deprecated\n");
2871 "SCTP: Use struct sctp_assoc_value instead\n");
2872 if (copy_from_user(&val, optval, optlen))
2874 params.assoc_id = 0;
2875 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2876 if (copy_from_user(¶ms, optval, optlen))
2878 val = params.assoc_value;
2882 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2885 asoc = sctp_id2assoc(sk, params.assoc_id);
2886 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2891 val = asoc->pathmtu;
2892 val -= sp->pf->af->net_header_len;
2893 val -= sizeof(struct sctphdr) +
2894 sizeof(struct sctp_data_chunk);
2896 asoc->user_frag = val;
2897 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
2899 sp->user_frag = val;
2907 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2909 * Requests that the peer mark the enclosed address as the association
2910 * primary. The enclosed address must be one of the association's
2911 * locally bound addresses. The following structure is used to make a
2912 * set primary request:
2914 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2915 unsigned int optlen)
2917 struct sctp_sock *sp;
2918 struct sctp_endpoint *ep;
2919 struct sctp_association *asoc = NULL;
2920 struct sctp_setpeerprim prim;
2921 struct sctp_chunk *chunk;
2927 if (!sctp_addip_enable)
2930 if (optlen != sizeof(struct sctp_setpeerprim))
2933 if (copy_from_user(&prim, optval, optlen))
2936 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2940 if (!asoc->peer.asconf_capable)
2943 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2946 if (!sctp_state(asoc, ESTABLISHED))
2949 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2950 return -EADDRNOTAVAIL;
2952 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2953 chunk = sctp_make_asconf_set_prim(asoc,
2954 (union sctp_addr *)&prim.sspp_addr);
2958 err = sctp_send_asconf(asoc, chunk);
2960 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2965 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2966 unsigned int optlen)
2968 struct sctp_setadaptation adaptation;
2970 if (optlen != sizeof(struct sctp_setadaptation))
2972 if (copy_from_user(&adaptation, optval, optlen))
2975 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
2981 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2983 * The context field in the sctp_sndrcvinfo structure is normally only
2984 * used when a failed message is retrieved holding the value that was
2985 * sent down on the actual send call. This option allows the setting of
2986 * a default context on an association basis that will be received on
2987 * reading messages from the peer. This is especially helpful in the
2988 * one-2-many model for an application to keep some reference to an
2989 * internal state machine that is processing messages on the
2990 * association. Note that the setting of this value only effects
2991 * received messages from the peer and does not effect the value that is
2992 * saved with outbound messages.
2994 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
2995 unsigned int optlen)
2997 struct sctp_assoc_value params;
2998 struct sctp_sock *sp;
2999 struct sctp_association *asoc;
3001 if (optlen != sizeof(struct sctp_assoc_value))
3003 if (copy_from_user(¶ms, optval, optlen))
3008 if (params.assoc_id != 0) {
3009 asoc = sctp_id2assoc(sk, params.assoc_id);
3012 asoc->default_rcv_context = params.assoc_value;
3014 sp->default_rcv_context = params.assoc_value;
3021 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3023 * This options will at a minimum specify if the implementation is doing
3024 * fragmented interleave. Fragmented interleave, for a one to many
3025 * socket, is when subsequent calls to receive a message may return
3026 * parts of messages from different associations. Some implementations
3027 * may allow you to turn this value on or off. If so, when turned off,
3028 * no fragment interleave will occur (which will cause a head of line
3029 * blocking amongst multiple associations sharing the same one to many
3030 * socket). When this option is turned on, then each receive call may
3031 * come from a different association (thus the user must receive data
3032 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3033 * association each receive belongs to.
3035 * This option takes a boolean value. A non-zero value indicates that
3036 * fragmented interleave is on. A value of zero indicates that
3037 * fragmented interleave is off.
3039 * Note that it is important that an implementation that allows this
3040 * option to be turned on, have it off by default. Otherwise an unaware
3041 * application using the one to many model may become confused and act
3044 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3045 char __user *optval,
3046 unsigned int optlen)
3050 if (optlen != sizeof(int))
3052 if (get_user(val, (int __user *)optval))
3055 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3061 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3062 * (SCTP_PARTIAL_DELIVERY_POINT)
3064 * This option will set or get the SCTP partial delivery point. This
3065 * point is the size of a message where the partial delivery API will be
3066 * invoked to help free up rwnd space for the peer. Setting this to a
3067 * lower value will cause partial deliveries to happen more often. The
3068 * calls argument is an integer that sets or gets the partial delivery
3069 * point. Note also that the call will fail if the user attempts to set
3070 * this value larger than the socket receive buffer size.
3072 * Note that any single message having a length smaller than or equal to
3073 * the SCTP partial delivery point will be delivered in one single read
3074 * call as long as the user provided buffer is large enough to hold the
3077 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3078 char __user *optval,
3079 unsigned int optlen)
3083 if (optlen != sizeof(u32))
3085 if (get_user(val, (int __user *)optval))
3088 /* Note: We double the receive buffer from what the user sets
3089 * it to be, also initial rwnd is based on rcvbuf/2.
3091 if (val > (sk->sk_rcvbuf >> 1))
3094 sctp_sk(sk)->pd_point = val;
3096 return 0; /* is this the right error code? */
3100 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3102 * This option will allow a user to change the maximum burst of packets
3103 * that can be emitted by this association. Note that the default value
3104 * is 4, and some implementations may restrict this setting so that it
3105 * can only be lowered.
3107 * NOTE: This text doesn't seem right. Do this on a socket basis with
3108 * future associations inheriting the socket value.
3110 static int sctp_setsockopt_maxburst(struct sock *sk,
3111 char __user *optval,
3112 unsigned int optlen)
3114 struct sctp_assoc_value params;
3115 struct sctp_sock *sp;
3116 struct sctp_association *asoc;
3120 if (optlen == sizeof(int)) {
3122 "SCTP: Use of int in max_burst socket option deprecated\n");
3124 "SCTP: Use struct sctp_assoc_value instead\n");
3125 if (copy_from_user(&val, optval, optlen))
3127 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3128 if (copy_from_user(¶ms, optval, optlen))
3130 val = params.assoc_value;
3131 assoc_id = params.assoc_id;
3137 if (assoc_id != 0) {
3138 asoc = sctp_id2assoc(sk, assoc_id);
3141 asoc->max_burst = val;
3143 sp->max_burst = val;
3149 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3151 * This set option adds a chunk type that the user is requesting to be
3152 * received only in an authenticated way. Changes to the list of chunks
3153 * will only effect future associations on the socket.
3155 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3156 char __user *optval,
3157 unsigned int optlen)
3159 struct sctp_authchunk val;
3161 if (!sctp_auth_enable)
3164 if (optlen != sizeof(struct sctp_authchunk))
3166 if (copy_from_user(&val, optval, optlen))
3169 switch (val.sauth_chunk) {
3171 case SCTP_CID_INIT_ACK:
3172 case SCTP_CID_SHUTDOWN_COMPLETE:
3177 /* add this chunk id to the endpoint */
3178 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3182 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3184 * This option gets or sets the list of HMAC algorithms that the local
3185 * endpoint requires the peer to use.
3187 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3188 char __user *optval,
3189 unsigned int optlen)
3191 struct sctp_hmacalgo *hmacs;
3195 if (!sctp_auth_enable)
3198 if (optlen < sizeof(struct sctp_hmacalgo))
3201 hmacs = kmalloc(optlen, GFP_KERNEL);
3205 if (copy_from_user(hmacs, optval, optlen)) {
3210 idents = hmacs->shmac_num_idents;
3211 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3212 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3217 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3224 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3226 * This option will set a shared secret key which is used to build an
3227 * association shared key.
3229 static int sctp_setsockopt_auth_key(struct sock *sk,
3230 char __user *optval,
3231 unsigned int optlen)
3233 struct sctp_authkey *authkey;
3234 struct sctp_association *asoc;
3237 if (!sctp_auth_enable)
3240 if (optlen <= sizeof(struct sctp_authkey))
3243 authkey = kmalloc(optlen, GFP_KERNEL);
3247 if (copy_from_user(authkey, optval, optlen)) {
3252 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3257 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3258 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3263 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3270 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3272 * This option will get or set the active shared key to be used to build
3273 * the association shared key.
3275 static int sctp_setsockopt_active_key(struct sock *sk,
3276 char __user *optval,
3277 unsigned int optlen)
3279 struct sctp_authkeyid val;
3280 struct sctp_association *asoc;
3282 if (!sctp_auth_enable)
3285 if (optlen != sizeof(struct sctp_authkeyid))
3287 if (copy_from_user(&val, optval, optlen))
3290 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3291 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3294 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3295 val.scact_keynumber);
3299 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3301 * This set option will delete a shared secret key from use.
3303 static int sctp_setsockopt_del_key(struct sock *sk,
3304 char __user *optval,
3305 unsigned int optlen)
3307 struct sctp_authkeyid val;
3308 struct sctp_association *asoc;
3310 if (!sctp_auth_enable)
3313 if (optlen != sizeof(struct sctp_authkeyid))
3315 if (copy_from_user(&val, optval, optlen))
3318 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3319 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3322 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3323 val.scact_keynumber);
3328 /* API 6.2 setsockopt(), getsockopt()
3330 * Applications use setsockopt() and getsockopt() to set or retrieve
3331 * socket options. Socket options are used to change the default
3332 * behavior of sockets calls. They are described in Section 7.
3336 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3337 * int __user *optlen);
3338 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3341 * sd - the socket descript.
3342 * level - set to IPPROTO_SCTP for all SCTP options.
3343 * optname - the option name.
3344 * optval - the buffer to store the value of the option.
3345 * optlen - the size of the buffer.
3347 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3348 char __user *optval, unsigned int optlen)
3352 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3355 /* I can hardly begin to describe how wrong this is. This is
3356 * so broken as to be worse than useless. The API draft
3357 * REALLY is NOT helpful here... I am not convinced that the
3358 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3359 * are at all well-founded.
3361 if (level != SOL_SCTP) {
3362 struct sctp_af *af = sctp_sk(sk)->pf->af;
3363 retval = af->setsockopt(sk, level, optname, optval, optlen);
3370 case SCTP_SOCKOPT_BINDX_ADD:
3371 /* 'optlen' is the size of the addresses buffer. */
3372 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3373 optlen, SCTP_BINDX_ADD_ADDR);
3376 case SCTP_SOCKOPT_BINDX_REM:
3377 /* 'optlen' is the size of the addresses buffer. */
3378 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3379 optlen, SCTP_BINDX_REM_ADDR);
3382 case SCTP_SOCKOPT_CONNECTX_OLD:
3383 /* 'optlen' is the size of the addresses buffer. */
3384 retval = sctp_setsockopt_connectx_old(sk,
3385 (struct sockaddr __user *)optval,
3389 case SCTP_SOCKOPT_CONNECTX:
3390 /* 'optlen' is the size of the addresses buffer. */
3391 retval = sctp_setsockopt_connectx(sk,
3392 (struct sockaddr __user *)optval,
3396 case SCTP_DISABLE_FRAGMENTS:
3397 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3401 retval = sctp_setsockopt_events(sk, optval, optlen);
3404 case SCTP_AUTOCLOSE:
3405 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3408 case SCTP_PEER_ADDR_PARAMS:
3409 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3412 case SCTP_DELAYED_ACK:
3413 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3415 case SCTP_PARTIAL_DELIVERY_POINT:
3416 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3420 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3422 case SCTP_DEFAULT_SEND_PARAM:
3423 retval = sctp_setsockopt_default_send_param(sk, optval,
3426 case SCTP_PRIMARY_ADDR:
3427 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3429 case SCTP_SET_PEER_PRIMARY_ADDR:
3430 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3433 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3436 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3438 case SCTP_ASSOCINFO:
3439 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3441 case SCTP_I_WANT_MAPPED_V4_ADDR:
3442 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3445 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3447 case SCTP_ADAPTATION_LAYER:
3448 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3451 retval = sctp_setsockopt_context(sk, optval, optlen);
3453 case SCTP_FRAGMENT_INTERLEAVE:
3454 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3456 case SCTP_MAX_BURST:
3457 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3459 case SCTP_AUTH_CHUNK:
3460 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3462 case SCTP_HMAC_IDENT:
3463 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3466 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3468 case SCTP_AUTH_ACTIVE_KEY:
3469 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3471 case SCTP_AUTH_DELETE_KEY:
3472 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3475 retval = -ENOPROTOOPT;
3479 sctp_release_sock(sk);
3485 /* API 3.1.6 connect() - UDP Style Syntax
3487 * An application may use the connect() call in the UDP model to initiate an
3488 * association without sending data.
3492 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3494 * sd: the socket descriptor to have a new association added to.
3496 * nam: the address structure (either struct sockaddr_in or struct
3497 * sockaddr_in6 defined in RFC2553 [7]).
3499 * len: the size of the address.
3501 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3509 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3510 __func__, sk, addr, addr_len);
3512 /* Validate addr_len before calling common connect/connectx routine. */
3513 af = sctp_get_af_specific(addr->sa_family);
3514 if (!af || addr_len < af->sockaddr_len) {
3517 /* Pass correct addr len to common routine (so it knows there
3518 * is only one address being passed.
3520 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3523 sctp_release_sock(sk);
3527 /* FIXME: Write comments. */
3528 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3530 return -EOPNOTSUPP; /* STUB */
3533 /* 4.1.4 accept() - TCP Style Syntax
3535 * Applications use accept() call to remove an established SCTP
3536 * association from the accept queue of the endpoint. A new socket
3537 * descriptor will be returned from accept() to represent the newly
3538 * formed association.
3540 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3542 struct sctp_sock *sp;
3543 struct sctp_endpoint *ep;
3544 struct sock *newsk = NULL;
3545 struct sctp_association *asoc;
3554 if (!sctp_style(sk, TCP)) {
3555 error = -EOPNOTSUPP;
3559 if (!sctp_sstate(sk, LISTENING)) {
3564 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3566 error = sctp_wait_for_accept(sk, timeo);
3570 /* We treat the list of associations on the endpoint as the accept
3571 * queue and pick the first association on the list.
3573 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3575 newsk = sp->pf->create_accept_sk(sk, asoc);
3581 /* Populate the fields of the newsk from the oldsk and migrate the
3582 * asoc to the newsk.
3584 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3587 sctp_release_sock(sk);
3592 /* The SCTP ioctl handler. */
3593 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3595 return -ENOIOCTLCMD;
3598 /* This is the function which gets called during socket creation to
3599 * initialized the SCTP-specific portion of the sock.
3600 * The sock structure should already be zero-filled memory.
3602 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3604 struct sctp_endpoint *ep;
3605 struct sctp_sock *sp;
3607 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3611 /* Initialize the SCTP per socket area. */
3612 switch (sk->sk_type) {
3613 case SOCK_SEQPACKET:
3614 sp->type = SCTP_SOCKET_UDP;
3617 sp->type = SCTP_SOCKET_TCP;
3620 return -ESOCKTNOSUPPORT;
3623 /* Initialize default send parameters. These parameters can be
3624 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3626 sp->default_stream = 0;
3627 sp->default_ppid = 0;
3628 sp->default_flags = 0;
3629 sp->default_context = 0;
3630 sp->default_timetolive = 0;
3632 sp->default_rcv_context = 0;
3633 sp->max_burst = sctp_max_burst;
3635 /* Initialize default setup parameters. These parameters
3636 * can be modified with the SCTP_INITMSG socket option or
3637 * overridden by the SCTP_INIT CMSG.
3639 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3640 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3641 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3642 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3644 /* Initialize default RTO related parameters. These parameters can
3645 * be modified for with the SCTP_RTOINFO socket option.
3647 sp->rtoinfo.srto_initial = sctp_rto_initial;
3648 sp->rtoinfo.srto_max = sctp_rto_max;
3649 sp->rtoinfo.srto_min = sctp_rto_min;
3651 /* Initialize default association related parameters. These parameters
3652 * can be modified with the SCTP_ASSOCINFO socket option.
3654 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3655 sp->assocparams.sasoc_number_peer_destinations = 0;
3656 sp->assocparams.sasoc_peer_rwnd = 0;
3657 sp->assocparams.sasoc_local_rwnd = 0;
3658 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3660 /* Initialize default event subscriptions. By default, all the
3663 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3665 /* Default Peer Address Parameters. These defaults can
3666 * be modified via SCTP_PEER_ADDR_PARAMS
3668 sp->hbinterval = sctp_hb_interval;
3669 sp->pathmaxrxt = sctp_max_retrans_path;
3670 sp->pathmtu = 0; // allow default discovery
3671 sp->sackdelay = sctp_sack_timeout;
3673 sp->param_flags = SPP_HB_ENABLE |
3675 SPP_SACKDELAY_ENABLE;
3677 /* If enabled no SCTP message fragmentation will be performed.
3678 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3680 sp->disable_fragments = 0;
3682 /* Enable Nagle algorithm by default. */
3685 /* Enable by default. */
3688 /* Auto-close idle associations after the configured
3689 * number of seconds. A value of 0 disables this
3690 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3691 * for UDP-style sockets only.
3695 /* User specified fragmentation limit. */
3698 sp->adaptation_ind = 0;
3700 sp->pf = sctp_get_pf_specific(sk->sk_family);
3702 /* Control variables for partial data delivery. */
3703 atomic_set(&sp->pd_mode, 0);
3704 skb_queue_head_init(&sp->pd_lobby);
3705 sp->frag_interleave = 0;
3707 /* Create a per socket endpoint structure. Even if we
3708 * change the data structure relationships, this may still
3709 * be useful for storing pre-connect address information.
3711 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3718 SCTP_DBG_OBJCNT_INC(sock);
3719 percpu_counter_inc(&sctp_sockets_allocated);
3722 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3728 /* Cleanup any SCTP per socket resources. */
3729 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3731 struct sctp_endpoint *ep;
3733 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3735 /* Release our hold on the endpoint. */
3736 ep = sctp_sk(sk)->ep;
3737 sctp_endpoint_free(ep);
3738 percpu_counter_dec(&sctp_sockets_allocated);
3740 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3744 /* API 4.1.7 shutdown() - TCP Style Syntax
3745 * int shutdown(int socket, int how);
3747 * sd - the socket descriptor of the association to be closed.
3748 * how - Specifies the type of shutdown. The values are
3751 * Disables further receive operations. No SCTP
3752 * protocol action is taken.
3754 * Disables further send operations, and initiates
3755 * the SCTP shutdown sequence.
3757 * Disables further send and receive operations
3758 * and initiates the SCTP shutdown sequence.
3760 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3762 struct sctp_endpoint *ep;
3763 struct sctp_association *asoc;
3765 if (!sctp_style(sk, TCP))
3768 if (how & SEND_SHUTDOWN) {
3769 ep = sctp_sk(sk)->ep;
3770 if (!list_empty(&ep->asocs)) {
3771 asoc = list_entry(ep->asocs.next,
3772 struct sctp_association, asocs);
3773 sctp_primitive_SHUTDOWN(asoc, NULL);
3778 /* 7.2.1 Association Status (SCTP_STATUS)
3780 * Applications can retrieve current status information about an
3781 * association, including association state, peer receiver window size,
3782 * number of unacked data chunks, and number of data chunks pending
3783 * receipt. This information is read-only.
3785 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3786 char __user *optval,
3789 struct sctp_status status;
3790 struct sctp_association *asoc = NULL;
3791 struct sctp_transport *transport;
3792 sctp_assoc_t associd;
3795 if (len < sizeof(status)) {
3800 len = sizeof(status);
3801 if (copy_from_user(&status, optval, len)) {
3806 associd = status.sstat_assoc_id;
3807 asoc = sctp_id2assoc(sk, associd);
3813 transport = asoc->peer.primary_path;
3815 status.sstat_assoc_id = sctp_assoc2id(asoc);
3816 status.sstat_state = asoc->state;
3817 status.sstat_rwnd = asoc->peer.rwnd;
3818 status.sstat_unackdata = asoc->unack_data;
3820 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3821 status.sstat_instrms = asoc->c.sinit_max_instreams;
3822 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3823 status.sstat_fragmentation_point = asoc->frag_point;
3824 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3825 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3826 transport->af_specific->sockaddr_len);
3827 /* Map ipv4 address into v4-mapped-on-v6 address. */
3828 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3829 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3830 status.sstat_primary.spinfo_state = transport->state;
3831 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3832 status.sstat_primary.spinfo_srtt = transport->srtt;
3833 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3834 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3836 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3837 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3839 if (put_user(len, optlen)) {
3844 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3845 len, status.sstat_state, status.sstat_rwnd,
3846 status.sstat_assoc_id);
3848 if (copy_to_user(optval, &status, len)) {
3858 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3860 * Applications can retrieve information about a specific peer address
3861 * of an association, including its reachability state, congestion
3862 * window, and retransmission timer values. This information is
3865 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3866 char __user *optval,
3869 struct sctp_paddrinfo pinfo;
3870 struct sctp_transport *transport;
3873 if (len < sizeof(pinfo)) {
3878 len = sizeof(pinfo);
3879 if (copy_from_user(&pinfo, optval, len)) {
3884 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3885 pinfo.spinfo_assoc_id);
3889 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3890 pinfo.spinfo_state = transport->state;
3891 pinfo.spinfo_cwnd = transport->cwnd;
3892 pinfo.spinfo_srtt = transport->srtt;
3893 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3894 pinfo.spinfo_mtu = transport->pathmtu;
3896 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3897 pinfo.spinfo_state = SCTP_ACTIVE;
3899 if (put_user(len, optlen)) {
3904 if (copy_to_user(optval, &pinfo, len)) {
3913 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3915 * This option is a on/off flag. If enabled no SCTP message
3916 * fragmentation will be performed. Instead if a message being sent
3917 * exceeds the current PMTU size, the message will NOT be sent and
3918 * instead a error will be indicated to the user.
3920 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3921 char __user *optval, int __user *optlen)
3925 if (len < sizeof(int))
3929 val = (sctp_sk(sk)->disable_fragments == 1);
3930 if (put_user(len, optlen))
3932 if (copy_to_user(optval, &val, len))
3937 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3939 * This socket option is used to specify various notifications and
3940 * ancillary data the user wishes to receive.
3942 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3945 if (len < sizeof(struct sctp_event_subscribe))
3947 len = sizeof(struct sctp_event_subscribe);
3948 if (put_user(len, optlen))
3950 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3955 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3957 * This socket option is applicable to the UDP-style socket only. When
3958 * set it will cause associations that are idle for more than the
3959 * specified number of seconds to automatically close. An association
3960 * being idle is defined an association that has NOT sent or received
3961 * user data. The special value of '0' indicates that no automatic
3962 * close of any associations should be performed. The option expects an
3963 * integer defining the number of seconds of idle time before an
3964 * association is closed.
3966 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3968 /* Applicable to UDP-style socket only */
3969 if (sctp_style(sk, TCP))
3971 if (len < sizeof(int))
3974 if (put_user(len, optlen))
3976 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
3981 /* Helper routine to branch off an association to a new socket. */
3982 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3983 struct socket **sockp)
3985 struct sock *sk = asoc->base.sk;
3986 struct socket *sock;
3990 /* An association cannot be branched off from an already peeled-off
3991 * socket, nor is this supported for tcp style sockets.
3993 if (!sctp_style(sk, UDP))
3996 /* Create a new socket. */
3997 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4001 sctp_copy_sock(sock->sk, sk, asoc);
4003 /* Make peeled-off sockets more like 1-1 accepted sockets.
4004 * Set the daddr and initialize id to something more random
4006 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4007 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4009 /* Populate the fields of the newsk from the oldsk and migrate the
4010 * asoc to the newsk.
4012 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4019 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4021 sctp_peeloff_arg_t peeloff;
4022 struct socket *newsock;
4024 struct sctp_association *asoc;
4026 if (len < sizeof(sctp_peeloff_arg_t))
4028 len = sizeof(sctp_peeloff_arg_t);
4029 if (copy_from_user(&peeloff, optval, len))
4032 asoc = sctp_id2assoc(sk, peeloff.associd);
4038 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
4040 retval = sctp_do_peeloff(asoc, &newsock);
4044 /* Map the socket to an unused fd that can be returned to the user. */
4045 retval = sock_map_fd(newsock, 0);
4047 sock_release(newsock);
4051 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4052 __func__, sk, asoc, newsock->sk, retval);
4054 /* Return the fd mapped to the new socket. */
4055 peeloff.sd = retval;
4056 if (put_user(len, optlen))
4058 if (copy_to_user(optval, &peeloff, len))
4065 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4067 * Applications can enable or disable heartbeats for any peer address of
4068 * an association, modify an address's heartbeat interval, force a
4069 * heartbeat to be sent immediately, and adjust the address's maximum
4070 * number of retransmissions sent before an address is considered
4071 * unreachable. The following structure is used to access and modify an
4072 * address's parameters:
4074 * struct sctp_paddrparams {
4075 * sctp_assoc_t spp_assoc_id;
4076 * struct sockaddr_storage spp_address;
4077 * uint32_t spp_hbinterval;
4078 * uint16_t spp_pathmaxrxt;
4079 * uint32_t spp_pathmtu;
4080 * uint32_t spp_sackdelay;
4081 * uint32_t spp_flags;
4084 * spp_assoc_id - (one-to-many style socket) This is filled in the
4085 * application, and identifies the association for
4087 * spp_address - This specifies which address is of interest.
4088 * spp_hbinterval - This contains the value of the heartbeat interval,
4089 * in milliseconds. If a value of zero
4090 * is present in this field then no changes are to
4091 * be made to this parameter.
4092 * spp_pathmaxrxt - This contains the maximum number of
4093 * retransmissions before this address shall be
4094 * considered unreachable. If a value of zero
4095 * is present in this field then no changes are to
4096 * be made to this parameter.
4097 * spp_pathmtu - When Path MTU discovery is disabled the value
4098 * specified here will be the "fixed" path mtu.
4099 * Note that if the spp_address field is empty
4100 * then all associations on this address will
4101 * have this fixed path mtu set upon them.
4103 * spp_sackdelay - When delayed sack is enabled, this value specifies
4104 * the number of milliseconds that sacks will be delayed
4105 * for. This value will apply to all addresses of an
4106 * association if the spp_address field is empty. Note
4107 * also, that if delayed sack is enabled and this
4108 * value is set to 0, no change is made to the last
4109 * recorded delayed sack timer value.
4111 * spp_flags - These flags are used to control various features
4112 * on an association. The flag field may contain
4113 * zero or more of the following options.
4115 * SPP_HB_ENABLE - Enable heartbeats on the
4116 * specified address. Note that if the address
4117 * field is empty all addresses for the association
4118 * have heartbeats enabled upon them.
4120 * SPP_HB_DISABLE - Disable heartbeats on the
4121 * speicifed address. Note that if the address
4122 * field is empty all addresses for the association
4123 * will have their heartbeats disabled. Note also
4124 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4125 * mutually exclusive, only one of these two should
4126 * be specified. Enabling both fields will have
4127 * undetermined results.
4129 * SPP_HB_DEMAND - Request a user initiated heartbeat
4130 * to be made immediately.
4132 * SPP_PMTUD_ENABLE - This field will enable PMTU
4133 * discovery upon the specified address. Note that
4134 * if the address feild is empty then all addresses
4135 * on the association are effected.
4137 * SPP_PMTUD_DISABLE - This field will disable PMTU
4138 * discovery upon the specified address. Note that
4139 * if the address feild is empty then all addresses
4140 * on the association are effected. Not also that
4141 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4142 * exclusive. Enabling both will have undetermined
4145 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4146 * on delayed sack. The time specified in spp_sackdelay
4147 * is used to specify the sack delay for this address. Note
4148 * that if spp_address is empty then all addresses will
4149 * enable delayed sack and take on the sack delay
4150 * value specified in spp_sackdelay.
4151 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4152 * off delayed sack. If the spp_address field is blank then
4153 * delayed sack is disabled for the entire association. Note
4154 * also that this field is mutually exclusive to
4155 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4158 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4159 char __user *optval, int __user *optlen)
4161 struct sctp_paddrparams params;
4162 struct sctp_transport *trans = NULL;
4163 struct sctp_association *asoc = NULL;
4164 struct sctp_sock *sp = sctp_sk(sk);
4166 if (len < sizeof(struct sctp_paddrparams))
4168 len = sizeof(struct sctp_paddrparams);
4169 if (copy_from_user(¶ms, optval, len))
4172 /* If an address other than INADDR_ANY is specified, and
4173 * no transport is found, then the request is invalid.
4175 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4176 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4177 params.spp_assoc_id);
4179 SCTP_DEBUG_PRINTK("Failed no transport\n");
4184 /* Get association, if assoc_id != 0 and the socket is a one
4185 * to many style socket, and an association was not found, then
4186 * the id was invalid.
4188 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4189 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4190 SCTP_DEBUG_PRINTK("Failed no association\n");
4195 /* Fetch transport values. */
4196 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4197 params.spp_pathmtu = trans->pathmtu;
4198 params.spp_pathmaxrxt = trans->pathmaxrxt;
4199 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4201 /*draft-11 doesn't say what to return in spp_flags*/
4202 params.spp_flags = trans->param_flags;
4204 /* Fetch association values. */
4205 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4206 params.spp_pathmtu = asoc->pathmtu;
4207 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4208 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4210 /*draft-11 doesn't say what to return in spp_flags*/
4211 params.spp_flags = asoc->param_flags;
4213 /* Fetch socket values. */
4214 params.spp_hbinterval = sp->hbinterval;
4215 params.spp_pathmtu = sp->pathmtu;
4216 params.spp_sackdelay = sp->sackdelay;
4217 params.spp_pathmaxrxt = sp->pathmaxrxt;
4219 /*draft-11 doesn't say what to return in spp_flags*/
4220 params.spp_flags = sp->param_flags;
4223 if (copy_to_user(optval, ¶ms, len))
4226 if (put_user(len, optlen))
4233 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4235 * This option will effect the way delayed acks are performed. This
4236 * option allows you to get or set the delayed ack time, in
4237 * milliseconds. It also allows changing the delayed ack frequency.
4238 * Changing the frequency to 1 disables the delayed sack algorithm. If
4239 * the assoc_id is 0, then this sets or gets the endpoints default
4240 * values. If the assoc_id field is non-zero, then the set or get
4241 * effects the specified association for the one to many model (the
4242 * assoc_id field is ignored by the one to one model). Note that if
4243 * sack_delay or sack_freq are 0 when setting this option, then the
4244 * current values will remain unchanged.
4246 * struct sctp_sack_info {
4247 * sctp_assoc_t sack_assoc_id;
4248 * uint32_t sack_delay;
4249 * uint32_t sack_freq;
4252 * sack_assoc_id - This parameter, indicates which association the user
4253 * is performing an action upon. Note that if this field's value is
4254 * zero then the endpoints default value is changed (effecting future
4255 * associations only).
4257 * sack_delay - This parameter contains the number of milliseconds that
4258 * the user is requesting the delayed ACK timer be set to. Note that
4259 * this value is defined in the standard to be between 200 and 500
4262 * sack_freq - This parameter contains the number of packets that must
4263 * be received before a sack is sent without waiting for the delay
4264 * timer to expire. The default value for this is 2, setting this
4265 * value to 1 will disable the delayed sack algorithm.
4267 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4268 char __user *optval,
4271 struct sctp_sack_info params;
4272 struct sctp_association *asoc = NULL;
4273 struct sctp_sock *sp = sctp_sk(sk);
4275 if (len >= sizeof(struct sctp_sack_info)) {
4276 len = sizeof(struct sctp_sack_info);
4278 if (copy_from_user(¶ms, optval, len))
4280 } else if (len == sizeof(struct sctp_assoc_value)) {
4281 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
4282 "in delayed_ack socket option deprecated\n");
4283 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
4284 if (copy_from_user(¶ms, optval, len))
4289 /* Get association, if sack_assoc_id != 0 and the socket is a one
4290 * to many style socket, and an association was not found, then
4291 * the id was invalid.
4293 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4294 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4298 /* Fetch association values. */
4299 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4300 params.sack_delay = jiffies_to_msecs(
4302 params.sack_freq = asoc->sackfreq;
4305 params.sack_delay = 0;
4306 params.sack_freq = 1;
4309 /* Fetch socket values. */
4310 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4311 params.sack_delay = sp->sackdelay;
4312 params.sack_freq = sp->sackfreq;
4314 params.sack_delay = 0;
4315 params.sack_freq = 1;
4319 if (copy_to_user(optval, ¶ms, len))
4322 if (put_user(len, optlen))
4328 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4330 * Applications can specify protocol parameters for the default association
4331 * initialization. The option name argument to setsockopt() and getsockopt()
4334 * Setting initialization parameters is effective only on an unconnected
4335 * socket (for UDP-style sockets only future associations are effected
4336 * by the change). With TCP-style sockets, this option is inherited by
4337 * sockets derived from a listener socket.
4339 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4341 if (len < sizeof(struct sctp_initmsg))
4343 len = sizeof(struct sctp_initmsg);
4344 if (put_user(len, optlen))
4346 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4352 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4353 char __user *optval, int __user *optlen)
4355 struct sctp_association *asoc;
4357 struct sctp_getaddrs getaddrs;
4358 struct sctp_transport *from;
4360 union sctp_addr temp;
4361 struct sctp_sock *sp = sctp_sk(sk);
4366 if (len < sizeof(struct sctp_getaddrs))
4369 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4372 /* For UDP-style sockets, id specifies the association to query. */
4373 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4377 to = optval + offsetof(struct sctp_getaddrs,addrs);
4378 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4380 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4382 memcpy(&temp, &from->ipaddr, sizeof(temp));
4383 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4384 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4385 if (space_left < addrlen)
4387 if (copy_to_user(to, &temp, addrlen))
4391 space_left -= addrlen;
4394 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4396 bytes_copied = ((char __user *)to) - optval;
4397 if (put_user(bytes_copied, optlen))
4403 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4404 size_t space_left, int *bytes_copied)
4406 struct sctp_sockaddr_entry *addr;
4407 union sctp_addr temp;
4412 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4416 if ((PF_INET == sk->sk_family) &&
4417 (AF_INET6 == addr->a.sa.sa_family))
4419 if ((PF_INET6 == sk->sk_family) &&
4420 inet_v6_ipv6only(sk) &&
4421 (AF_INET == addr->a.sa.sa_family))
4423 memcpy(&temp, &addr->a, sizeof(temp));
4424 if (!temp.v4.sin_port)
4425 temp.v4.sin_port = htons(port);
4427 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4429 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4430 if (space_left < addrlen) {
4434 memcpy(to, &temp, addrlen);
4438 space_left -= addrlen;
4439 *bytes_copied += addrlen;
4447 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4448 char __user *optval, int __user *optlen)
4450 struct sctp_bind_addr *bp;
4451 struct sctp_association *asoc;
4453 struct sctp_getaddrs getaddrs;
4454 struct sctp_sockaddr_entry *addr;
4456 union sctp_addr temp;
4457 struct sctp_sock *sp = sctp_sk(sk);
4461 int bytes_copied = 0;
4465 if (len < sizeof(struct sctp_getaddrs))
4468 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4472 * For UDP-style sockets, id specifies the association to query.
4473 * If the id field is set to the value '0' then the locally bound
4474 * addresses are returned without regard to any particular
4477 if (0 == getaddrs.assoc_id) {
4478 bp = &sctp_sk(sk)->ep->base.bind_addr;
4480 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4483 bp = &asoc->base.bind_addr;
4486 to = optval + offsetof(struct sctp_getaddrs,addrs);
4487 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4489 addrs = kmalloc(space_left, GFP_KERNEL);
4493 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4494 * addresses from the global local address list.
4496 if (sctp_list_single_entry(&bp->address_list)) {
4497 addr = list_entry(bp->address_list.next,
4498 struct sctp_sockaddr_entry, list);
4499 if (sctp_is_any(sk, &addr->a)) {
4500 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4501 space_left, &bytes_copied);
4511 /* Protection on the bound address list is not needed since
4512 * in the socket option context we hold a socket lock and
4513 * thus the bound address list can't change.
4515 list_for_each_entry(addr, &bp->address_list, list) {
4516 memcpy(&temp, &addr->a, sizeof(temp));
4517 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4518 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4519 if (space_left < addrlen) {
4520 err = -ENOMEM; /*fixme: right error?*/
4523 memcpy(buf, &temp, addrlen);
4525 bytes_copied += addrlen;
4527 space_left -= addrlen;
4531 if (copy_to_user(to, addrs, bytes_copied)) {
4535 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4539 if (put_user(bytes_copied, optlen))
4546 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4548 * Requests that the local SCTP stack use the enclosed peer address as
4549 * the association primary. The enclosed address must be one of the
4550 * association peer's addresses.
4552 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4553 char __user *optval, int __user *optlen)
4555 struct sctp_prim prim;
4556 struct sctp_association *asoc;
4557 struct sctp_sock *sp = sctp_sk(sk);
4559 if (len < sizeof(struct sctp_prim))
4562 len = sizeof(struct sctp_prim);
4564 if (copy_from_user(&prim, optval, len))
4567 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4571 if (!asoc->peer.primary_path)
4574 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4575 asoc->peer.primary_path->af_specific->sockaddr_len);
4577 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4578 (union sctp_addr *)&prim.ssp_addr);
4580 if (put_user(len, optlen))
4582 if (copy_to_user(optval, &prim, len))
4589 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4591 * Requests that the local endpoint set the specified Adaptation Layer
4592 * Indication parameter for all future INIT and INIT-ACK exchanges.
4594 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4595 char __user *optval, int __user *optlen)
4597 struct sctp_setadaptation adaptation;
4599 if (len < sizeof(struct sctp_setadaptation))
4602 len = sizeof(struct sctp_setadaptation);
4604 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4606 if (put_user(len, optlen))
4608 if (copy_to_user(optval, &adaptation, len))
4616 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4618 * Applications that wish to use the sendto() system call may wish to
4619 * specify a default set of parameters that would normally be supplied
4620 * through the inclusion of ancillary data. This socket option allows
4621 * such an application to set the default sctp_sndrcvinfo structure.
4624 * The application that wishes to use this socket option simply passes
4625 * in to this call the sctp_sndrcvinfo structure defined in Section
4626 * 5.2.2) The input parameters accepted by this call include
4627 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4628 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4629 * to this call if the caller is using the UDP model.
4631 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4633 static int sctp_getsockopt_default_send_param(struct sock *sk,
4634 int len, char __user *optval,
4637 struct sctp_sndrcvinfo info;
4638 struct sctp_association *asoc;
4639 struct sctp_sock *sp = sctp_sk(sk);
4641 if (len < sizeof(struct sctp_sndrcvinfo))
4644 len = sizeof(struct sctp_sndrcvinfo);
4646 if (copy_from_user(&info, optval, len))
4649 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4650 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4654 info.sinfo_stream = asoc->default_stream;
4655 info.sinfo_flags = asoc->default_flags;
4656 info.sinfo_ppid = asoc->default_ppid;
4657 info.sinfo_context = asoc->default_context;
4658 info.sinfo_timetolive = asoc->default_timetolive;
4660 info.sinfo_stream = sp->default_stream;
4661 info.sinfo_flags = sp->default_flags;
4662 info.sinfo_ppid = sp->default_ppid;
4663 info.sinfo_context = sp->default_context;
4664 info.sinfo_timetolive = sp->default_timetolive;
4667 if (put_user(len, optlen))
4669 if (copy_to_user(optval, &info, len))
4677 * 7.1.5 SCTP_NODELAY
4679 * Turn on/off any Nagle-like algorithm. This means that packets are
4680 * generally sent as soon as possible and no unnecessary delays are
4681 * introduced, at the cost of more packets in the network. Expects an
4682 * integer boolean flag.
4685 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4686 char __user *optval, int __user *optlen)
4690 if (len < sizeof(int))
4694 val = (sctp_sk(sk)->nodelay == 1);
4695 if (put_user(len, optlen))
4697 if (copy_to_user(optval, &val, len))
4704 * 7.1.1 SCTP_RTOINFO
4706 * The protocol parameters used to initialize and bound retransmission
4707 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4708 * and modify these parameters.
4709 * All parameters are time values, in milliseconds. A value of 0, when
4710 * modifying the parameters, indicates that the current value should not
4714 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4715 char __user *optval,
4716 int __user *optlen) {
4717 struct sctp_rtoinfo rtoinfo;
4718 struct sctp_association *asoc;
4720 if (len < sizeof (struct sctp_rtoinfo))
4723 len = sizeof(struct sctp_rtoinfo);
4725 if (copy_from_user(&rtoinfo, optval, len))
4728 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4730 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4733 /* Values corresponding to the specific association. */
4735 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4736 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4737 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4739 /* Values corresponding to the endpoint. */
4740 struct sctp_sock *sp = sctp_sk(sk);
4742 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4743 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4744 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4747 if (put_user(len, optlen))
4750 if (copy_to_user(optval, &rtoinfo, len))
4758 * 7.1.2 SCTP_ASSOCINFO
4760 * This option is used to tune the maximum retransmission attempts
4761 * of the association.
4762 * Returns an error if the new association retransmission value is
4763 * greater than the sum of the retransmission value of the peer.
4764 * See [SCTP] for more information.
4767 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4768 char __user *optval,
4772 struct sctp_assocparams assocparams;
4773 struct sctp_association *asoc;
4774 struct list_head *pos;
4777 if (len < sizeof (struct sctp_assocparams))
4780 len = sizeof(struct sctp_assocparams);
4782 if (copy_from_user(&assocparams, optval, len))
4785 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4787 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4790 /* Values correspoinding to the specific association */
4792 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4793 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4794 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4795 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4797 (asoc->cookie_life.tv_usec
4800 list_for_each(pos, &asoc->peer.transport_addr_list) {
4804 assocparams.sasoc_number_peer_destinations = cnt;
4806 /* Values corresponding to the endpoint */
4807 struct sctp_sock *sp = sctp_sk(sk);
4809 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
4810 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
4811 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
4812 assocparams.sasoc_cookie_life =
4813 sp->assocparams.sasoc_cookie_life;
4814 assocparams.sasoc_number_peer_destinations =
4816 sasoc_number_peer_destinations;
4819 if (put_user(len, optlen))
4822 if (copy_to_user(optval, &assocparams, len))
4829 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4831 * This socket option is a boolean flag which turns on or off mapped V4
4832 * addresses. If this option is turned on and the socket is type
4833 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4834 * If this option is turned off, then no mapping will be done of V4
4835 * addresses and a user will receive both PF_INET6 and PF_INET type
4836 * addresses on the socket.
4838 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
4839 char __user *optval, int __user *optlen)
4842 struct sctp_sock *sp = sctp_sk(sk);
4844 if (len < sizeof(int))
4849 if (put_user(len, optlen))
4851 if (copy_to_user(optval, &val, len))
4858 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4859 * (chapter and verse is quoted at sctp_setsockopt_context())
4861 static int sctp_getsockopt_context(struct sock *sk, int len,
4862 char __user *optval, int __user *optlen)
4864 struct sctp_assoc_value params;
4865 struct sctp_sock *sp;
4866 struct sctp_association *asoc;
4868 if (len < sizeof(struct sctp_assoc_value))
4871 len = sizeof(struct sctp_assoc_value);
4873 if (copy_from_user(¶ms, optval, len))
4878 if (params.assoc_id != 0) {
4879 asoc = sctp_id2assoc(sk, params.assoc_id);
4882 params.assoc_value = asoc->default_rcv_context;
4884 params.assoc_value = sp->default_rcv_context;
4887 if (put_user(len, optlen))
4889 if (copy_to_user(optval, ¶ms, len))
4896 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4897 * This option will get or set the maximum size to put in any outgoing
4898 * SCTP DATA chunk. If a message is larger than this size it will be
4899 * fragmented by SCTP into the specified size. Note that the underlying
4900 * SCTP implementation may fragment into smaller sized chunks when the
4901 * PMTU of the underlying association is smaller than the value set by
4902 * the user. The default value for this option is '0' which indicates
4903 * the user is NOT limiting fragmentation and only the PMTU will effect
4904 * SCTP's choice of DATA chunk size. Note also that values set larger
4905 * than the maximum size of an IP datagram will effectively let SCTP
4906 * control fragmentation (i.e. the same as setting this option to 0).
4908 * The following structure is used to access and modify this parameter:
4910 * struct sctp_assoc_value {
4911 * sctp_assoc_t assoc_id;
4912 * uint32_t assoc_value;
4915 * assoc_id: This parameter is ignored for one-to-one style sockets.
4916 * For one-to-many style sockets this parameter indicates which
4917 * association the user is performing an action upon. Note that if
4918 * this field's value is zero then the endpoints default value is
4919 * changed (effecting future associations only).
4920 * assoc_value: This parameter specifies the maximum size in bytes.
4922 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
4923 char __user *optval, int __user *optlen)
4925 struct sctp_assoc_value params;
4926 struct sctp_association *asoc;
4928 if (len == sizeof(int)) {
4930 "SCTP: Use of int in maxseg socket option deprecated\n");
4932 "SCTP: Use struct sctp_assoc_value instead\n");
4933 params.assoc_id = 0;
4934 } else if (len >= sizeof(struct sctp_assoc_value)) {
4935 len = sizeof(struct sctp_assoc_value);
4936 if (copy_from_user(¶ms, optval, sizeof(params)))
4941 asoc = sctp_id2assoc(sk, params.assoc_id);
4942 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
4946 params.assoc_value = asoc->frag_point;
4948 params.assoc_value = sctp_sk(sk)->user_frag;
4950 if (put_user(len, optlen))
4952 if (len == sizeof(int)) {
4953 if (copy_to_user(optval, ¶ms.assoc_value, len))
4956 if (copy_to_user(optval, ¶ms, len))
4964 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4965 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4967 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
4968 char __user *optval, int __user *optlen)
4972 if (len < sizeof(int))
4977 val = sctp_sk(sk)->frag_interleave;
4978 if (put_user(len, optlen))
4980 if (copy_to_user(optval, &val, len))
4987 * 7.1.25. Set or Get the sctp partial delivery point
4988 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4990 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
4991 char __user *optval,
4996 if (len < sizeof(u32))
5001 val = sctp_sk(sk)->pd_point;
5002 if (put_user(len, optlen))
5004 if (copy_to_user(optval, &val, len))
5011 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5012 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5014 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5015 char __user *optval,
5018 struct sctp_assoc_value params;
5019 struct sctp_sock *sp;
5020 struct sctp_association *asoc;
5022 if (len == sizeof(int)) {
5024 "SCTP: Use of int in max_burst socket option deprecated\n");
5026 "SCTP: Use struct sctp_assoc_value instead\n");
5027 params.assoc_id = 0;
5028 } else if (len >= sizeof(struct sctp_assoc_value)) {
5029 len = sizeof(struct sctp_assoc_value);
5030 if (copy_from_user(¶ms, optval, len))
5037 if (params.assoc_id != 0) {
5038 asoc = sctp_id2assoc(sk, params.assoc_id);
5041 params.assoc_value = asoc->max_burst;
5043 params.assoc_value = sp->max_burst;
5045 if (len == sizeof(int)) {
5046 if (copy_to_user(optval, ¶ms.assoc_value, len))
5049 if (copy_to_user(optval, ¶ms, len))
5057 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5058 char __user *optval, int __user *optlen)
5060 struct sctp_hmacalgo __user *p = (void __user *)optval;
5061 struct sctp_hmac_algo_param *hmacs;
5065 if (!sctp_auth_enable)
5068 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5069 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5071 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5074 len = sizeof(struct sctp_hmacalgo) + data_len;
5075 num_idents = data_len / sizeof(u16);
5077 if (put_user(len, optlen))
5079 if (put_user(num_idents, &p->shmac_num_idents))
5081 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5086 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5087 char __user *optval, int __user *optlen)
5089 struct sctp_authkeyid val;
5090 struct sctp_association *asoc;
5092 if (!sctp_auth_enable)
5095 if (len < sizeof(struct sctp_authkeyid))
5097 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5100 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5101 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5105 val.scact_keynumber = asoc->active_key_id;
5107 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5109 len = sizeof(struct sctp_authkeyid);
5110 if (put_user(len, optlen))
5112 if (copy_to_user(optval, &val, len))
5118 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5119 char __user *optval, int __user *optlen)
5121 struct sctp_authchunks __user *p = (void __user *)optval;
5122 struct sctp_authchunks val;
5123 struct sctp_association *asoc;
5124 struct sctp_chunks_param *ch;
5128 if (!sctp_auth_enable)
5131 if (len < sizeof(struct sctp_authchunks))
5134 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5137 to = p->gauth_chunks;
5138 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5142 ch = asoc->peer.peer_chunks;
5146 /* See if the user provided enough room for all the data */
5147 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5148 if (len < num_chunks)
5151 if (copy_to_user(to, ch->chunks, num_chunks))
5154 len = sizeof(struct sctp_authchunks) + num_chunks;
5155 if (put_user(len, optlen)) return -EFAULT;
5156 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5161 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5162 char __user *optval, int __user *optlen)
5164 struct sctp_authchunks __user *p = (void __user *)optval;
5165 struct sctp_authchunks val;
5166 struct sctp_association *asoc;
5167 struct sctp_chunks_param *ch;
5171 if (!sctp_auth_enable)
5174 if (len < sizeof(struct sctp_authchunks))
5177 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5180 to = p->gauth_chunks;
5181 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5182 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5186 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5188 ch = sctp_sk(sk)->ep->auth_chunk_list;
5193 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5194 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5197 if (copy_to_user(to, ch->chunks, num_chunks))
5200 len = sizeof(struct sctp_authchunks) + num_chunks;
5201 if (put_user(len, optlen))
5203 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5210 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5211 * This option gets the current number of associations that are attached
5212 * to a one-to-many style socket. The option value is an uint32_t.
5214 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5215 char __user *optval, int __user *optlen)
5217 struct sctp_sock *sp = sctp_sk(sk);
5218 struct sctp_association *asoc;
5221 if (sctp_style(sk, TCP))
5224 if (len < sizeof(u32))
5229 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5233 if (put_user(len, optlen))
5235 if (copy_to_user(optval, &val, len))
5241 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5242 char __user *optval, int __user *optlen)
5247 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5250 /* I can hardly begin to describe how wrong this is. This is
5251 * so broken as to be worse than useless. The API draft
5252 * REALLY is NOT helpful here... I am not convinced that the
5253 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5254 * are at all well-founded.
5256 if (level != SOL_SCTP) {
5257 struct sctp_af *af = sctp_sk(sk)->pf->af;
5259 retval = af->getsockopt(sk, level, optname, optval, optlen);
5263 if (get_user(len, optlen))
5270 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5272 case SCTP_DISABLE_FRAGMENTS:
5273 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5277 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5279 case SCTP_AUTOCLOSE:
5280 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5282 case SCTP_SOCKOPT_PEELOFF:
5283 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5285 case SCTP_PEER_ADDR_PARAMS:
5286 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5289 case SCTP_DELAYED_ACK:
5290 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5294 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5296 case SCTP_GET_PEER_ADDRS:
5297 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5300 case SCTP_GET_LOCAL_ADDRS:
5301 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5304 case SCTP_SOCKOPT_CONNECTX3:
5305 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5307 case SCTP_DEFAULT_SEND_PARAM:
5308 retval = sctp_getsockopt_default_send_param(sk, len,
5311 case SCTP_PRIMARY_ADDR:
5312 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5315 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5318 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5320 case SCTP_ASSOCINFO:
5321 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5323 case SCTP_I_WANT_MAPPED_V4_ADDR:
5324 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5327 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5329 case SCTP_GET_PEER_ADDR_INFO:
5330 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5333 case SCTP_ADAPTATION_LAYER:
5334 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5338 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5340 case SCTP_FRAGMENT_INTERLEAVE:
5341 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5344 case SCTP_PARTIAL_DELIVERY_POINT:
5345 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5348 case SCTP_MAX_BURST:
5349 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5352 case SCTP_AUTH_CHUNK:
5353 case SCTP_AUTH_DELETE_KEY:
5354 retval = -EOPNOTSUPP;
5356 case SCTP_HMAC_IDENT:
5357 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5359 case SCTP_AUTH_ACTIVE_KEY:
5360 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5362 case SCTP_PEER_AUTH_CHUNKS:
5363 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5366 case SCTP_LOCAL_AUTH_CHUNKS:
5367 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5370 case SCTP_GET_ASSOC_NUMBER:
5371 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5374 retval = -ENOPROTOOPT;
5378 sctp_release_sock(sk);
5382 static void sctp_hash(struct sock *sk)
5387 static void sctp_unhash(struct sock *sk)
5392 /* Check if port is acceptable. Possibly find first available port.
5394 * The port hash table (contained in the 'global' SCTP protocol storage
5395 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5396 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5397 * list (the list number is the port number hashed out, so as you
5398 * would expect from a hash function, all the ports in a given list have
5399 * such a number that hashes out to the same list number; you were
5400 * expecting that, right?); so each list has a set of ports, with a
5401 * link to the socket (struct sock) that uses it, the port number and
5402 * a fastreuse flag (FIXME: NPI ipg).
5404 static struct sctp_bind_bucket *sctp_bucket_create(
5405 struct sctp_bind_hashbucket *head, unsigned short snum);
5407 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5409 struct sctp_bind_hashbucket *head; /* hash list */
5410 struct sctp_bind_bucket *pp; /* hash list port iterator */
5411 struct hlist_node *node;
5412 unsigned short snum;
5415 snum = ntohs(addr->v4.sin_port);
5417 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5418 sctp_local_bh_disable();
5421 /* Search for an available port. */
5422 int low, high, remaining, index;
5425 inet_get_local_port_range(&low, &high);
5426 remaining = (high - low) + 1;
5427 rover = net_random() % remaining + low;
5431 if ((rover < low) || (rover > high))
5433 index = sctp_phashfn(rover);
5434 head = &sctp_port_hashtable[index];
5435 sctp_spin_lock(&head->lock);
5436 sctp_for_each_hentry(pp, node, &head->chain)
5437 if (pp->port == rover)
5441 sctp_spin_unlock(&head->lock);
5442 } while (--remaining > 0);
5444 /* Exhausted local port range during search? */
5449 /* OK, here is the one we will use. HEAD (the port
5450 * hash table list entry) is non-NULL and we hold it's
5455 /* We are given an specific port number; we verify
5456 * that it is not being used. If it is used, we will
5457 * exahust the search in the hash list corresponding
5458 * to the port number (snum) - we detect that with the
5459 * port iterator, pp being NULL.
5461 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5462 sctp_spin_lock(&head->lock);
5463 sctp_for_each_hentry(pp, node, &head->chain) {
5464 if (pp->port == snum)
5471 if (!hlist_empty(&pp->owner)) {
5472 /* We had a port hash table hit - there is an
5473 * available port (pp != NULL) and it is being
5474 * used by other socket (pp->owner not empty); that other
5475 * socket is going to be sk2.
5477 int reuse = sk->sk_reuse;
5479 struct hlist_node *node;
5481 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5482 if (pp->fastreuse && sk->sk_reuse &&
5483 sk->sk_state != SCTP_SS_LISTENING)
5486 /* Run through the list of sockets bound to the port
5487 * (pp->port) [via the pointers bind_next and
5488 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5489 * we get the endpoint they describe and run through
5490 * the endpoint's list of IP (v4 or v6) addresses,
5491 * comparing each of the addresses with the address of
5492 * the socket sk. If we find a match, then that means
5493 * that this port/socket (sk) combination are already
5496 sk_for_each_bound(sk2, node, &pp->owner) {
5497 struct sctp_endpoint *ep2;
5498 ep2 = sctp_sk(sk2)->ep;
5501 (reuse && sk2->sk_reuse &&
5502 sk2->sk_state != SCTP_SS_LISTENING))
5505 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5506 sctp_sk(sk2), sctp_sk(sk))) {
5511 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5514 /* If there was a hash table miss, create a new port. */
5516 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5519 /* In either case (hit or miss), make sure fastreuse is 1 only
5520 * if sk->sk_reuse is too (that is, if the caller requested
5521 * SO_REUSEADDR on this socket -sk-).
5523 if (hlist_empty(&pp->owner)) {
5524 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5528 } else if (pp->fastreuse &&
5529 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5532 /* We are set, so fill up all the data in the hash table
5533 * entry, tie the socket list information with the rest of the
5534 * sockets FIXME: Blurry, NPI (ipg).
5537 if (!sctp_sk(sk)->bind_hash) {
5538 inet_sk(sk)->inet_num = snum;
5539 sk_add_bind_node(sk, &pp->owner);
5540 sctp_sk(sk)->bind_hash = pp;
5545 sctp_spin_unlock(&head->lock);
5548 sctp_local_bh_enable();
5552 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5553 * port is requested.
5555 static int sctp_get_port(struct sock *sk, unsigned short snum)
5558 union sctp_addr addr;
5559 struct sctp_af *af = sctp_sk(sk)->pf->af;
5561 /* Set up a dummy address struct from the sk. */
5562 af->from_sk(&addr, sk);
5563 addr.v4.sin_port = htons(snum);
5565 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5566 ret = sctp_get_port_local(sk, &addr);
5568 return (ret ? 1 : 0);
5572 * Move a socket to LISTENING state.
5574 SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
5576 struct sctp_sock *sp = sctp_sk(sk);
5577 struct sctp_endpoint *ep = sp->ep;
5578 struct crypto_hash *tfm = NULL;
5580 /* Allocate HMAC for generating cookie. */
5581 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5582 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5584 if (net_ratelimit()) {
5586 "SCTP: failed to load transform for %s: %ld\n",
5587 sctp_hmac_alg, PTR_ERR(tfm));
5591 sctp_sk(sk)->hmac = tfm;
5595 * If a bind() or sctp_bindx() is not called prior to a listen()
5596 * call that allows new associations to be accepted, the system
5597 * picks an ephemeral port and will choose an address set equivalent
5598 * to binding with a wildcard address.
5600 * This is not currently spelled out in the SCTP sockets
5601 * extensions draft, but follows the practice as seen in TCP
5605 sk->sk_state = SCTP_SS_LISTENING;
5606 if (!ep->base.bind_addr.port) {
5607 if (sctp_autobind(sk))
5610 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
5611 sk->sk_state = SCTP_SS_CLOSED;
5616 sk->sk_max_ack_backlog = backlog;
5617 sctp_hash_endpoint(ep);
5622 * 4.1.3 / 5.1.3 listen()
5624 * By default, new associations are not accepted for UDP style sockets.
5625 * An application uses listen() to mark a socket as being able to
5626 * accept new associations.
5628 * On TCP style sockets, applications use listen() to ready the SCTP
5629 * endpoint for accepting inbound associations.
5631 * On both types of endpoints a backlog of '0' disables listening.
5633 * Move a socket to LISTENING state.
5635 int sctp_inet_listen(struct socket *sock, int backlog)
5637 struct sock *sk = sock->sk;
5638 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5641 if (unlikely(backlog < 0))
5646 /* Peeled-off sockets are not allowed to listen(). */
5647 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
5650 if (sock->state != SS_UNCONNECTED)
5653 /* If backlog is zero, disable listening. */
5655 if (sctp_sstate(sk, CLOSED))
5659 sctp_unhash_endpoint(ep);
5660 sk->sk_state = SCTP_SS_CLOSED;
5662 sctp_sk(sk)->bind_hash->fastreuse = 1;
5666 /* If we are already listening, just update the backlog */
5667 if (sctp_sstate(sk, LISTENING))
5668 sk->sk_max_ack_backlog = backlog;
5670 err = sctp_listen_start(sk, backlog);
5677 sctp_release_sock(sk);
5682 * This function is done by modeling the current datagram_poll() and the
5683 * tcp_poll(). Note that, based on these implementations, we don't
5684 * lock the socket in this function, even though it seems that,
5685 * ideally, locking or some other mechanisms can be used to ensure
5686 * the integrity of the counters (sndbuf and wmem_alloc) used
5687 * in this place. We assume that we don't need locks either until proven
5690 * Another thing to note is that we include the Async I/O support
5691 * here, again, by modeling the current TCP/UDP code. We don't have
5692 * a good way to test with it yet.
5694 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5696 struct sock *sk = sock->sk;
5697 struct sctp_sock *sp = sctp_sk(sk);
5700 poll_wait(file, sk->sk_sleep, wait);
5702 /* A TCP-style listening socket becomes readable when the accept queue
5705 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5706 return (!list_empty(&sp->ep->asocs)) ?
5707 (POLLIN | POLLRDNORM) : 0;
5711 /* Is there any exceptional events? */
5712 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5714 if (sk->sk_shutdown & RCV_SHUTDOWN)
5716 if (sk->sk_shutdown == SHUTDOWN_MASK)
5719 /* Is it readable? Reconsider this code with TCP-style support. */
5720 if (!skb_queue_empty(&sk->sk_receive_queue) ||
5721 (sk->sk_shutdown & RCV_SHUTDOWN))
5722 mask |= POLLIN | POLLRDNORM;
5724 /* The association is either gone or not ready. */
5725 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5728 /* Is it writable? */
5729 if (sctp_writeable(sk)) {
5730 mask |= POLLOUT | POLLWRNORM;
5732 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5734 * Since the socket is not locked, the buffer
5735 * might be made available after the writeable check and
5736 * before the bit is set. This could cause a lost I/O
5737 * signal. tcp_poll() has a race breaker for this race
5738 * condition. Based on their implementation, we put
5739 * in the following code to cover it as well.
5741 if (sctp_writeable(sk))
5742 mask |= POLLOUT | POLLWRNORM;
5747 /********************************************************************
5748 * 2nd Level Abstractions
5749 ********************************************************************/
5751 static struct sctp_bind_bucket *sctp_bucket_create(
5752 struct sctp_bind_hashbucket *head, unsigned short snum)
5754 struct sctp_bind_bucket *pp;
5756 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
5758 SCTP_DBG_OBJCNT_INC(bind_bucket);
5761 INIT_HLIST_HEAD(&pp->owner);
5762 hlist_add_head(&pp->node, &head->chain);
5767 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5768 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5770 if (pp && hlist_empty(&pp->owner)) {
5771 __hlist_del(&pp->node);
5772 kmem_cache_free(sctp_bucket_cachep, pp);
5773 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5777 /* Release this socket's reference to a local port. */
5778 static inline void __sctp_put_port(struct sock *sk)
5780 struct sctp_bind_hashbucket *head =
5781 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)];
5782 struct sctp_bind_bucket *pp;
5784 sctp_spin_lock(&head->lock);
5785 pp = sctp_sk(sk)->bind_hash;
5786 __sk_del_bind_node(sk);
5787 sctp_sk(sk)->bind_hash = NULL;
5788 inet_sk(sk)->inet_num = 0;
5789 sctp_bucket_destroy(pp);
5790 sctp_spin_unlock(&head->lock);
5793 void sctp_put_port(struct sock *sk)
5795 sctp_local_bh_disable();
5796 __sctp_put_port(sk);
5797 sctp_local_bh_enable();
5801 * The system picks an ephemeral port and choose an address set equivalent
5802 * to binding with a wildcard address.
5803 * One of those addresses will be the primary address for the association.
5804 * This automatically enables the multihoming capability of SCTP.
5806 static int sctp_autobind(struct sock *sk)
5808 union sctp_addr autoaddr;
5812 /* Initialize a local sockaddr structure to INADDR_ANY. */
5813 af = sctp_sk(sk)->pf->af;
5815 port = htons(inet_sk(sk)->inet_num);
5816 af->inaddr_any(&autoaddr, port);
5818 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
5821 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5824 * 4.2 The cmsghdr Structure *
5826 * When ancillary data is sent or received, any number of ancillary data
5827 * objects can be specified by the msg_control and msg_controllen members of
5828 * the msghdr structure, because each object is preceded by
5829 * a cmsghdr structure defining the object's length (the cmsg_len member).
5830 * Historically Berkeley-derived implementations have passed only one object
5831 * at a time, but this API allows multiple objects to be
5832 * passed in a single call to sendmsg() or recvmsg(). The following example
5833 * shows two ancillary data objects in a control buffer.
5835 * |<--------------------------- msg_controllen -------------------------->|
5838 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5840 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5843 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5845 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5848 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5849 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5851 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5853 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5860 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
5861 sctp_cmsgs_t *cmsgs)
5863 struct cmsghdr *cmsg;
5864 struct msghdr *my_msg = (struct msghdr *)msg;
5866 for (cmsg = CMSG_FIRSTHDR(msg);
5868 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
5869 if (!CMSG_OK(my_msg, cmsg))
5872 /* Should we parse this header or ignore? */
5873 if (cmsg->cmsg_level != IPPROTO_SCTP)
5876 /* Strictly check lengths following example in SCM code. */
5877 switch (cmsg->cmsg_type) {
5879 /* SCTP Socket API Extension
5880 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5882 * This cmsghdr structure provides information for
5883 * initializing new SCTP associations with sendmsg().
5884 * The SCTP_INITMSG socket option uses this same data
5885 * structure. This structure is not used for
5888 * cmsg_level cmsg_type cmsg_data[]
5889 * ------------ ------------ ----------------------
5890 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5892 if (cmsg->cmsg_len !=
5893 CMSG_LEN(sizeof(struct sctp_initmsg)))
5895 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
5899 /* SCTP Socket API Extension
5900 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5902 * This cmsghdr structure specifies SCTP options for
5903 * sendmsg() and describes SCTP header information
5904 * about a received message through recvmsg().
5906 * cmsg_level cmsg_type cmsg_data[]
5907 * ------------ ------------ ----------------------
5908 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5910 if (cmsg->cmsg_len !=
5911 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
5915 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
5917 /* Minimally, validate the sinfo_flags. */
5918 if (cmsgs->info->sinfo_flags &
5919 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
5920 SCTP_ABORT | SCTP_EOF))
5932 * Wait for a packet..
5933 * Note: This function is the same function as in core/datagram.c
5934 * with a few modifications to make lksctp work.
5936 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
5941 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
5943 /* Socket errors? */
5944 error = sock_error(sk);
5948 if (!skb_queue_empty(&sk->sk_receive_queue))
5951 /* Socket shut down? */
5952 if (sk->sk_shutdown & RCV_SHUTDOWN)
5955 /* Sequenced packets can come disconnected. If so we report the
5960 /* Is there a good reason to think that we may receive some data? */
5961 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
5964 /* Handle signals. */
5965 if (signal_pending(current))
5968 /* Let another process have a go. Since we are going to sleep
5969 * anyway. Note: This may cause odd behaviors if the message
5970 * does not fit in the user's buffer, but this seems to be the
5971 * only way to honor MSG_DONTWAIT realistically.
5973 sctp_release_sock(sk);
5974 *timeo_p = schedule_timeout(*timeo_p);
5978 finish_wait(sk->sk_sleep, &wait);
5982 error = sock_intr_errno(*timeo_p);
5985 finish_wait(sk->sk_sleep, &wait);
5990 /* Receive a datagram.
5991 * Note: This is pretty much the same routine as in core/datagram.c
5992 * with a few changes to make lksctp work.
5994 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
5995 int noblock, int *err)
5998 struct sk_buff *skb;
6001 timeo = sock_rcvtimeo(sk, noblock);
6003 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6004 timeo, MAX_SCHEDULE_TIMEOUT);
6007 /* Again only user level code calls this function,
6008 * so nothing interrupt level
6009 * will suddenly eat the receive_queue.
6011 * Look at current nfs client by the way...
6012 * However, this function was corrent in any case. 8)
6014 if (flags & MSG_PEEK) {
6015 spin_lock_bh(&sk->sk_receive_queue.lock);
6016 skb = skb_peek(&sk->sk_receive_queue);
6018 atomic_inc(&skb->users);
6019 spin_unlock_bh(&sk->sk_receive_queue.lock);
6021 skb = skb_dequeue(&sk->sk_receive_queue);
6027 /* Caller is allowed not to check sk->sk_err before calling. */
6028 error = sock_error(sk);
6032 if (sk->sk_shutdown & RCV_SHUTDOWN)
6035 /* User doesn't want to wait. */
6039 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6048 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6049 static void __sctp_write_space(struct sctp_association *asoc)
6051 struct sock *sk = asoc->base.sk;
6052 struct socket *sock = sk->sk_socket;
6054 if ((sctp_wspace(asoc) > 0) && sock) {
6055 if (waitqueue_active(&asoc->wait))
6056 wake_up_interruptible(&asoc->wait);
6058 if (sctp_writeable(sk)) {
6059 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6060 wake_up_interruptible(sk->sk_sleep);
6062 /* Note that we try to include the Async I/O support
6063 * here by modeling from the current TCP/UDP code.
6064 * We have not tested with it yet.
6066 if (sock->fasync_list &&
6067 !(sk->sk_shutdown & SEND_SHUTDOWN))
6068 sock_wake_async(sock,
6069 SOCK_WAKE_SPACE, POLL_OUT);
6074 /* Do accounting for the sndbuf space.
6075 * Decrement the used sndbuf space of the corresponding association by the
6076 * data size which was just transmitted(freed).
6078 static void sctp_wfree(struct sk_buff *skb)
6080 struct sctp_association *asoc;
6081 struct sctp_chunk *chunk;
6084 /* Get the saved chunk pointer. */
6085 chunk = *((struct sctp_chunk **)(skb->cb));
6088 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6089 sizeof(struct sk_buff) +
6090 sizeof(struct sctp_chunk);
6092 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6095 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6097 sk->sk_wmem_queued -= skb->truesize;
6098 sk_mem_uncharge(sk, skb->truesize);
6101 __sctp_write_space(asoc);
6103 sctp_association_put(asoc);
6106 /* Do accounting for the receive space on the socket.
6107 * Accounting for the association is done in ulpevent.c
6108 * We set this as a destructor for the cloned data skbs so that
6109 * accounting is done at the correct time.
6111 void sctp_sock_rfree(struct sk_buff *skb)
6113 struct sock *sk = skb->sk;
6114 struct sctp_ulpevent *event = sctp_skb2event(skb);
6116 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6119 * Mimic the behavior of sock_rfree
6121 sk_mem_uncharge(sk, event->rmem_len);
6125 /* Helper function to wait for space in the sndbuf. */
6126 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6129 struct sock *sk = asoc->base.sk;
6131 long current_timeo = *timeo_p;
6134 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6135 asoc, (long)(*timeo_p), msg_len);
6137 /* Increment the association's refcnt. */
6138 sctp_association_hold(asoc);
6140 /* Wait on the association specific sndbuf space. */
6142 prepare_to_wait_exclusive(&asoc->wait, &wait,
6143 TASK_INTERRUPTIBLE);
6146 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6149 if (signal_pending(current))
6150 goto do_interrupted;
6151 if (msg_len <= sctp_wspace(asoc))
6154 /* Let another process have a go. Since we are going
6157 sctp_release_sock(sk);
6158 current_timeo = schedule_timeout(current_timeo);
6159 BUG_ON(sk != asoc->base.sk);
6162 *timeo_p = current_timeo;
6166 finish_wait(&asoc->wait, &wait);
6168 /* Release the association's refcnt. */
6169 sctp_association_put(asoc);
6178 err = sock_intr_errno(*timeo_p);
6186 /* If socket sndbuf has changed, wake up all per association waiters. */
6187 void sctp_write_space(struct sock *sk)
6189 struct sctp_association *asoc;
6191 /* Wake up the tasks in each wait queue. */
6192 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6193 __sctp_write_space(asoc);
6197 /* Is there any sndbuf space available on the socket?
6199 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6200 * associations on the same socket. For a UDP-style socket with
6201 * multiple associations, it is possible for it to be "unwriteable"
6202 * prematurely. I assume that this is acceptable because
6203 * a premature "unwriteable" is better than an accidental "writeable" which
6204 * would cause an unwanted block under certain circumstances. For the 1-1
6205 * UDP-style sockets or TCP-style sockets, this code should work.
6208 static int sctp_writeable(struct sock *sk)
6212 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
6218 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6219 * returns immediately with EINPROGRESS.
6221 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6223 struct sock *sk = asoc->base.sk;
6225 long current_timeo = *timeo_p;
6228 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6231 /* Increment the association's refcnt. */
6232 sctp_association_hold(asoc);
6235 prepare_to_wait_exclusive(&asoc->wait, &wait,
6236 TASK_INTERRUPTIBLE);
6239 if (sk->sk_shutdown & RCV_SHUTDOWN)
6241 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6244 if (signal_pending(current))
6245 goto do_interrupted;
6247 if (sctp_state(asoc, ESTABLISHED))
6250 /* Let another process have a go. Since we are going
6253 sctp_release_sock(sk);
6254 current_timeo = schedule_timeout(current_timeo);
6257 *timeo_p = current_timeo;
6261 finish_wait(&asoc->wait, &wait);
6263 /* Release the association's refcnt. */
6264 sctp_association_put(asoc);
6269 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6272 err = -ECONNREFUSED;
6276 err = sock_intr_errno(*timeo_p);
6284 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6286 struct sctp_endpoint *ep;
6290 ep = sctp_sk(sk)->ep;
6294 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
6295 TASK_INTERRUPTIBLE);
6297 if (list_empty(&ep->asocs)) {
6298 sctp_release_sock(sk);
6299 timeo = schedule_timeout(timeo);
6304 if (!sctp_sstate(sk, LISTENING))
6308 if (!list_empty(&ep->asocs))
6311 err = sock_intr_errno(timeo);
6312 if (signal_pending(current))
6320 finish_wait(sk->sk_sleep, &wait);
6325 static void sctp_wait_for_close(struct sock *sk, long timeout)
6330 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6331 if (list_empty(&sctp_sk(sk)->ep->asocs))
6333 sctp_release_sock(sk);
6334 timeout = schedule_timeout(timeout);
6336 } while (!signal_pending(current) && timeout);
6338 finish_wait(sk->sk_sleep, &wait);
6341 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6343 struct sk_buff *frag;
6348 /* Don't forget the fragments. */
6349 skb_walk_frags(skb, frag)
6350 sctp_skb_set_owner_r_frag(frag, sk);
6353 sctp_skb_set_owner_r(skb, sk);
6356 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6357 struct sctp_association *asoc)
6359 struct inet_sock *inet = inet_sk(sk);
6360 struct inet_sock *newinet = inet_sk(newsk);
6362 newsk->sk_type = sk->sk_type;
6363 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6364 newsk->sk_flags = sk->sk_flags;
6365 newsk->sk_no_check = sk->sk_no_check;
6366 newsk->sk_reuse = sk->sk_reuse;
6368 newsk->sk_shutdown = sk->sk_shutdown;
6369 newsk->sk_destruct = inet_sock_destruct;
6370 newsk->sk_family = sk->sk_family;
6371 newsk->sk_protocol = IPPROTO_SCTP;
6372 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6373 newsk->sk_sndbuf = sk->sk_sndbuf;
6374 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6375 newsk->sk_lingertime = sk->sk_lingertime;
6376 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6377 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6379 newinet = inet_sk(newsk);
6381 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6382 * getsockname() and getpeername()
6384 newinet->inet_sport = inet->inet_sport;
6385 newinet->inet_saddr = inet->inet_saddr;
6386 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6387 newinet->inet_dport = htons(asoc->peer.port);
6388 newinet->pmtudisc = inet->pmtudisc;
6389 newinet->inet_id = asoc->next_tsn ^ jiffies;
6391 newinet->uc_ttl = inet->uc_ttl;
6392 newinet->mc_loop = 1;
6393 newinet->mc_ttl = 1;
6394 newinet->mc_index = 0;
6395 newinet->mc_list = NULL;
6398 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6399 * and its messages to the newsk.
6401 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6402 struct sctp_association *assoc,
6403 sctp_socket_type_t type)
6405 struct sctp_sock *oldsp = sctp_sk(oldsk);
6406 struct sctp_sock *newsp = sctp_sk(newsk);
6407 struct sctp_bind_bucket *pp; /* hash list port iterator */
6408 struct sctp_endpoint *newep = newsp->ep;
6409 struct sk_buff *skb, *tmp;
6410 struct sctp_ulpevent *event;
6411 struct sctp_bind_hashbucket *head;
6413 /* Migrate socket buffer sizes and all the socket level options to the
6416 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6417 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6418 /* Brute force copy old sctp opt. */
6419 inet_sk_copy_descendant(newsk, oldsk);
6421 /* Restore the ep value that was overwritten with the above structure
6427 /* Hook this new socket in to the bind_hash list. */
6428 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)];
6429 sctp_local_bh_disable();
6430 sctp_spin_lock(&head->lock);
6431 pp = sctp_sk(oldsk)->bind_hash;
6432 sk_add_bind_node(newsk, &pp->owner);
6433 sctp_sk(newsk)->bind_hash = pp;
6434 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
6435 sctp_spin_unlock(&head->lock);
6436 sctp_local_bh_enable();
6438 /* Copy the bind_addr list from the original endpoint to the new
6439 * endpoint so that we can handle restarts properly
6441 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6442 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6444 /* Move any messages in the old socket's receive queue that are for the
6445 * peeled off association to the new socket's receive queue.
6447 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6448 event = sctp_skb2event(skb);
6449 if (event->asoc == assoc) {
6450 __skb_unlink(skb, &oldsk->sk_receive_queue);
6451 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6452 sctp_skb_set_owner_r_frag(skb, newsk);
6456 /* Clean up any messages pending delivery due to partial
6457 * delivery. Three cases:
6458 * 1) No partial deliver; no work.
6459 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6460 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6462 skb_queue_head_init(&newsp->pd_lobby);
6463 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6465 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6466 struct sk_buff_head *queue;
6468 /* Decide which queue to move pd_lobby skbs to. */
6469 if (assoc->ulpq.pd_mode) {
6470 queue = &newsp->pd_lobby;
6472 queue = &newsk->sk_receive_queue;
6474 /* Walk through the pd_lobby, looking for skbs that
6475 * need moved to the new socket.
6477 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6478 event = sctp_skb2event(skb);
6479 if (event->asoc == assoc) {
6480 __skb_unlink(skb, &oldsp->pd_lobby);
6481 __skb_queue_tail(queue, skb);
6482 sctp_skb_set_owner_r_frag(skb, newsk);
6486 /* Clear up any skbs waiting for the partial
6487 * delivery to finish.
6489 if (assoc->ulpq.pd_mode)
6490 sctp_clear_pd(oldsk, NULL);
6494 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
6495 sctp_skb_set_owner_r_frag(skb, newsk);
6497 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
6498 sctp_skb_set_owner_r_frag(skb, newsk);
6500 /* Set the type of socket to indicate that it is peeled off from the
6501 * original UDP-style socket or created with the accept() call on a
6502 * TCP-style socket..
6506 /* Mark the new socket "in-use" by the user so that any packets
6507 * that may arrive on the association after we've moved it are
6508 * queued to the backlog. This prevents a potential race between
6509 * backlog processing on the old socket and new-packet processing
6510 * on the new socket.
6512 * The caller has just allocated newsk so we can guarantee that other
6513 * paths won't try to lock it and then oldsk.
6515 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6516 sctp_assoc_migrate(assoc, newsk);
6518 /* If the association on the newsk is already closed before accept()
6519 * is called, set RCV_SHUTDOWN flag.
6521 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6522 newsk->sk_shutdown |= RCV_SHUTDOWN;
6524 newsk->sk_state = SCTP_SS_ESTABLISHED;
6525 sctp_release_sock(newsk);
6529 /* This proto struct describes the ULP interface for SCTP. */
6530 struct proto sctp_prot = {
6532 .owner = THIS_MODULE,
6533 .close = sctp_close,
6534 .connect = sctp_connect,
6535 .disconnect = sctp_disconnect,
6536 .accept = sctp_accept,
6537 .ioctl = sctp_ioctl,
6538 .init = sctp_init_sock,
6539 .destroy = sctp_destroy_sock,
6540 .shutdown = sctp_shutdown,
6541 .setsockopt = sctp_setsockopt,
6542 .getsockopt = sctp_getsockopt,
6543 .sendmsg = sctp_sendmsg,
6544 .recvmsg = sctp_recvmsg,
6546 .backlog_rcv = sctp_backlog_rcv,
6548 .unhash = sctp_unhash,
6549 .get_port = sctp_get_port,
6550 .obj_size = sizeof(struct sctp_sock),
6551 .sysctl_mem = sysctl_sctp_mem,
6552 .sysctl_rmem = sysctl_sctp_rmem,
6553 .sysctl_wmem = sysctl_sctp_wmem,
6554 .memory_pressure = &sctp_memory_pressure,
6555 .enter_memory_pressure = sctp_enter_memory_pressure,
6556 .memory_allocated = &sctp_memory_allocated,
6557 .sockets_allocated = &sctp_sockets_allocated,
6560 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6562 struct proto sctpv6_prot = {
6564 .owner = THIS_MODULE,
6565 .close = sctp_close,
6566 .connect = sctp_connect,
6567 .disconnect = sctp_disconnect,
6568 .accept = sctp_accept,
6569 .ioctl = sctp_ioctl,
6570 .init = sctp_init_sock,
6571 .destroy = sctp_destroy_sock,
6572 .shutdown = sctp_shutdown,
6573 .setsockopt = sctp_setsockopt,
6574 .getsockopt = sctp_getsockopt,
6575 .sendmsg = sctp_sendmsg,
6576 .recvmsg = sctp_recvmsg,
6578 .backlog_rcv = sctp_backlog_rcv,
6580 .unhash = sctp_unhash,
6581 .get_port = sctp_get_port,
6582 .obj_size = sizeof(struct sctp6_sock),
6583 .sysctl_mem = sysctl_sctp_mem,
6584 .sysctl_rmem = sysctl_sctp_rmem,
6585 .sysctl_wmem = sysctl_sctp_wmem,
6586 .memory_pressure = &sctp_memory_pressure,
6587 .enter_memory_pressure = sctp_enter_memory_pressure,
6588 .memory_allocated = &sctp_memory_allocated,
6589 .sockets_allocated = &sctp_sockets_allocated,
6591 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */