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 = atomic_read(&asoc->base.sk->sk_wmem_alloc);
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)->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)->sport = htons(inet_sk(sk)->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);
1085 /* Prime the peer's transport structures. */
1086 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1094 addr_buf += af->sockaddr_len;
1095 walk_size += af->sockaddr_len;
1098 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1103 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1108 /* Initialize sk's dport and daddr for getpeername() */
1109 inet_sk(sk)->dport = htons(asoc->peer.port);
1110 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1111 af->to_sk_daddr(sa_addr, sk);
1114 /* in-kernel sockets don't generally have a file allocated to them
1115 * if all they do is call sock_create_kern().
1117 if (sk->sk_socket->file)
1118 f_flags = sk->sk_socket->file->f_flags;
1120 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1122 err = sctp_wait_for_connect(asoc, &timeo);
1123 if (!err && assoc_id)
1124 *assoc_id = asoc->assoc_id;
1126 /* Don't free association on exit. */
1131 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1132 " kaddrs: %p err: %d\n",
1135 sctp_association_free(asoc);
1139 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1142 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1143 * sctp_assoc_t *asoc);
1145 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1146 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1147 * or IPv6 addresses.
1149 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1150 * Section 3.1.2 for this usage.
1152 * addrs is a pointer to an array of one or more socket addresses. Each
1153 * address is contained in its appropriate structure (i.e. struct
1154 * sockaddr_in or struct sockaddr_in6) the family of the address type
1155 * must be used to distengish the address length (note that this
1156 * representation is termed a "packed array" of addresses). The caller
1157 * specifies the number of addresses in the array with addrcnt.
1159 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1160 * the association id of the new association. On failure, sctp_connectx()
1161 * returns -1, and sets errno to the appropriate error code. The assoc_id
1162 * is not touched by the kernel.
1164 * For SCTP, the port given in each socket address must be the same, or
1165 * sctp_connectx() will fail, setting errno to EINVAL.
1167 * An application can use sctp_connectx to initiate an association with
1168 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1169 * allows a caller to specify multiple addresses at which a peer can be
1170 * reached. The way the SCTP stack uses the list of addresses to set up
1171 * the association is implementation dependant. This function only
1172 * specifies that the stack will try to make use of all the addresses in
1173 * the list when needed.
1175 * Note that the list of addresses passed in is only used for setting up
1176 * the association. It does not necessarily equal the set of addresses
1177 * the peer uses for the resulting association. If the caller wants to
1178 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1179 * retrieve them after the association has been set up.
1181 * Basically do nothing but copying the addresses from user to kernel
1182 * land and invoking either sctp_connectx(). This is used for tunneling
1183 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1185 * We don't use copy_from_user() for optimization: we first do the
1186 * sanity checks (buffer size -fast- and access check-healthy
1187 * pointer); if all of those succeed, then we can alloc the memory
1188 * (expensive operation) needed to copy the data to kernel. Then we do
1189 * the copying without checking the user space area
1190 * (__copy_from_user()).
1192 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1195 * sk The sk of the socket
1196 * addrs The pointer to the addresses in user land
1197 * addrssize Size of the addrs buffer
1199 * Returns >=0 if ok, <0 errno code on error.
1201 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1202 struct sockaddr __user *addrs,
1204 sctp_assoc_t *assoc_id)
1207 struct sockaddr *kaddrs;
1209 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1210 __func__, sk, addrs, addrs_size);
1212 if (unlikely(addrs_size <= 0))
1215 /* Check the user passed a healthy pointer. */
1216 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1219 /* Alloc space for the address array in kernel memory. */
1220 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1221 if (unlikely(!kaddrs))
1224 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1227 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1236 * This is an older interface. It's kept for backward compatibility
1237 * to the option that doesn't provide association id.
1239 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1240 struct sockaddr __user *addrs,
1243 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1247 * New interface for the API. The since the API is done with a socket
1248 * option, to make it simple we feed back the association id is as a return
1249 * indication to the call. Error is always negative and association id is
1252 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1253 struct sockaddr __user *addrs,
1256 sctp_assoc_t assoc_id = 0;
1259 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1267 /* API 3.1.4 close() - UDP Style Syntax
1268 * Applications use close() to perform graceful shutdown (as described in
1269 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1270 * by a UDP-style socket.
1274 * ret = close(int sd);
1276 * sd - the socket descriptor of the associations to be closed.
1278 * To gracefully shutdown a specific association represented by the
1279 * UDP-style socket, an application should use the sendmsg() call,
1280 * passing no user data, but including the appropriate flag in the
1281 * ancillary data (see Section xxxx).
1283 * If sd in the close() call is a branched-off socket representing only
1284 * one association, the shutdown is performed on that association only.
1286 * 4.1.6 close() - TCP Style Syntax
1288 * Applications use close() to gracefully close down an association.
1292 * int close(int sd);
1294 * sd - the socket descriptor of the association to be closed.
1296 * After an application calls close() on a socket descriptor, no further
1297 * socket operations will succeed on that descriptor.
1299 * API 7.1.4 SO_LINGER
1301 * An application using the TCP-style socket can use this option to
1302 * perform the SCTP ABORT primitive. The linger option structure is:
1305 * int l_onoff; // option on/off
1306 * int l_linger; // linger time
1309 * To enable the option, set l_onoff to 1. If the l_linger value is set
1310 * to 0, calling close() is the same as the ABORT primitive. If the
1311 * value is set to a negative value, the setsockopt() call will return
1312 * an error. If the value is set to a positive value linger_time, the
1313 * close() can be blocked for at most linger_time ms. If the graceful
1314 * shutdown phase does not finish during this period, close() will
1315 * return but the graceful shutdown phase continues in the system.
1317 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1319 struct sctp_endpoint *ep;
1320 struct sctp_association *asoc;
1321 struct list_head *pos, *temp;
1323 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1326 sk->sk_shutdown = SHUTDOWN_MASK;
1328 ep = sctp_sk(sk)->ep;
1330 /* Walk all associations on an endpoint. */
1331 list_for_each_safe(pos, temp, &ep->asocs) {
1332 asoc = list_entry(pos, struct sctp_association, asocs);
1334 if (sctp_style(sk, TCP)) {
1335 /* A closed association can still be in the list if
1336 * it belongs to a TCP-style listening socket that is
1337 * not yet accepted. If so, free it. If not, send an
1338 * ABORT or SHUTDOWN based on the linger options.
1340 if (sctp_state(asoc, CLOSED)) {
1341 sctp_unhash_established(asoc);
1342 sctp_association_free(asoc);
1347 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1348 struct sctp_chunk *chunk;
1350 chunk = sctp_make_abort_user(asoc, NULL, 0);
1352 sctp_primitive_ABORT(asoc, chunk);
1354 sctp_primitive_SHUTDOWN(asoc, NULL);
1357 /* Clean up any skbs sitting on the receive queue. */
1358 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1359 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1361 /* On a TCP-style socket, block for at most linger_time if set. */
1362 if (sctp_style(sk, TCP) && timeout)
1363 sctp_wait_for_close(sk, timeout);
1365 /* This will run the backlog queue. */
1366 sctp_release_sock(sk);
1368 /* Supposedly, no process has access to the socket, but
1369 * the net layers still may.
1371 sctp_local_bh_disable();
1372 sctp_bh_lock_sock(sk);
1374 /* Hold the sock, since sk_common_release() will put sock_put()
1375 * and we have just a little more cleanup.
1378 sk_common_release(sk);
1380 sctp_bh_unlock_sock(sk);
1381 sctp_local_bh_enable();
1385 SCTP_DBG_OBJCNT_DEC(sock);
1388 /* Handle EPIPE error. */
1389 static int sctp_error(struct sock *sk, int flags, int err)
1392 err = sock_error(sk) ? : -EPIPE;
1393 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1394 send_sig(SIGPIPE, current, 0);
1398 /* API 3.1.3 sendmsg() - UDP Style Syntax
1400 * An application uses sendmsg() and recvmsg() calls to transmit data to
1401 * and receive data from its peer.
1403 * ssize_t sendmsg(int socket, const struct msghdr *message,
1406 * socket - the socket descriptor of the endpoint.
1407 * message - pointer to the msghdr structure which contains a single
1408 * user message and possibly some ancillary data.
1410 * See Section 5 for complete description of the data
1413 * flags - flags sent or received with the user message, see Section
1414 * 5 for complete description of the flags.
1416 * Note: This function could use a rewrite especially when explicit
1417 * connect support comes in.
1419 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1421 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1423 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1424 struct msghdr *msg, size_t msg_len)
1426 struct sctp_sock *sp;
1427 struct sctp_endpoint *ep;
1428 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1429 struct sctp_transport *transport, *chunk_tp;
1430 struct sctp_chunk *chunk;
1432 struct sockaddr *msg_name = NULL;
1433 struct sctp_sndrcvinfo default_sinfo = { 0 };
1434 struct sctp_sndrcvinfo *sinfo;
1435 struct sctp_initmsg *sinit;
1436 sctp_assoc_t associd = 0;
1437 sctp_cmsgs_t cmsgs = { NULL };
1441 __u16 sinfo_flags = 0;
1442 struct sctp_datamsg *datamsg;
1443 int msg_flags = msg->msg_flags;
1445 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1452 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1454 /* We cannot send a message over a TCP-style listening socket. */
1455 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1460 /* Parse out the SCTP CMSGs. */
1461 err = sctp_msghdr_parse(msg, &cmsgs);
1464 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1468 /* Fetch the destination address for this packet. This
1469 * address only selects the association--it is not necessarily
1470 * the address we will send to.
1471 * For a peeled-off socket, msg_name is ignored.
1473 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1474 int msg_namelen = msg->msg_namelen;
1476 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1481 if (msg_namelen > sizeof(to))
1482 msg_namelen = sizeof(to);
1483 memcpy(&to, msg->msg_name, msg_namelen);
1484 msg_name = msg->msg_name;
1490 /* Did the user specify SNDRCVINFO? */
1492 sinfo_flags = sinfo->sinfo_flags;
1493 associd = sinfo->sinfo_assoc_id;
1496 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1497 msg_len, sinfo_flags);
1499 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1500 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1505 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1506 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1507 * If SCTP_ABORT is set, the message length could be non zero with
1508 * the msg_iov set to the user abort reason.
1510 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1511 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1516 /* If SCTP_ADDR_OVER is set, there must be an address
1517 * specified in msg_name.
1519 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1526 SCTP_DEBUG_PRINTK("About to look up association.\n");
1530 /* If a msg_name has been specified, assume this is to be used. */
1532 /* Look for a matching association on the endpoint. */
1533 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1535 /* If we could not find a matching association on the
1536 * endpoint, make sure that it is not a TCP-style
1537 * socket that already has an association or there is
1538 * no peeled-off association on another socket.
1540 if ((sctp_style(sk, TCP) &&
1541 sctp_sstate(sk, ESTABLISHED)) ||
1542 sctp_endpoint_is_peeled_off(ep, &to)) {
1543 err = -EADDRNOTAVAIL;
1548 asoc = sctp_id2assoc(sk, associd);
1556 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1558 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1559 * socket that has an association in CLOSED state. This can
1560 * happen when an accepted socket has an association that is
1563 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1568 if (sinfo_flags & SCTP_EOF) {
1569 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1571 sctp_primitive_SHUTDOWN(asoc, NULL);
1575 if (sinfo_flags & SCTP_ABORT) {
1577 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1583 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1584 sctp_primitive_ABORT(asoc, chunk);
1590 /* Do we need to create the association? */
1592 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1594 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1599 /* Check for invalid stream against the stream counts,
1600 * either the default or the user specified stream counts.
1603 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1604 /* Check against the defaults. */
1605 if (sinfo->sinfo_stream >=
1606 sp->initmsg.sinit_num_ostreams) {
1611 /* Check against the requested. */
1612 if (sinfo->sinfo_stream >=
1613 sinit->sinit_num_ostreams) {
1621 * API 3.1.2 bind() - UDP Style Syntax
1622 * If a bind() or sctp_bindx() is not called prior to a
1623 * sendmsg() call that initiates a new association, the
1624 * system picks an ephemeral port and will choose an address
1625 * set equivalent to binding with a wildcard address.
1627 if (!ep->base.bind_addr.port) {
1628 if (sctp_autobind(sk)) {
1634 * If an unprivileged user inherits a one-to-many
1635 * style socket with open associations on a privileged
1636 * port, it MAY be permitted to accept new associations,
1637 * but it SHOULD NOT be permitted to open new
1640 if (ep->base.bind_addr.port < PROT_SOCK &&
1641 !capable(CAP_NET_BIND_SERVICE)) {
1647 scope = sctp_scope(&to);
1648 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1655 /* If the SCTP_INIT ancillary data is specified, set all
1656 * the association init values accordingly.
1659 if (sinit->sinit_num_ostreams) {
1660 asoc->c.sinit_num_ostreams =
1661 sinit->sinit_num_ostreams;
1663 if (sinit->sinit_max_instreams) {
1664 asoc->c.sinit_max_instreams =
1665 sinit->sinit_max_instreams;
1667 if (sinit->sinit_max_attempts) {
1668 asoc->max_init_attempts
1669 = sinit->sinit_max_attempts;
1671 if (sinit->sinit_max_init_timeo) {
1672 asoc->max_init_timeo =
1673 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1677 /* Prime the peer's transport structures. */
1678 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1683 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1690 /* ASSERT: we have a valid association at this point. */
1691 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1694 /* If the user didn't specify SNDRCVINFO, make up one with
1697 default_sinfo.sinfo_stream = asoc->default_stream;
1698 default_sinfo.sinfo_flags = asoc->default_flags;
1699 default_sinfo.sinfo_ppid = asoc->default_ppid;
1700 default_sinfo.sinfo_context = asoc->default_context;
1701 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1702 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1703 sinfo = &default_sinfo;
1706 /* API 7.1.7, the sndbuf size per association bounds the
1707 * maximum size of data that can be sent in a single send call.
1709 if (msg_len > sk->sk_sndbuf) {
1714 if (asoc->pmtu_pending)
1715 sctp_assoc_pending_pmtu(asoc);
1717 /* If fragmentation is disabled and the message length exceeds the
1718 * association fragmentation point, return EMSGSIZE. The I-D
1719 * does not specify what this error is, but this looks like
1722 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1728 /* Check for invalid stream. */
1729 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1735 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1736 if (!sctp_wspace(asoc)) {
1737 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1742 /* If an address is passed with the sendto/sendmsg call, it is used
1743 * to override the primary destination address in the TCP model, or
1744 * when SCTP_ADDR_OVER flag is set in the UDP model.
1746 if ((sctp_style(sk, TCP) && msg_name) ||
1747 (sinfo_flags & SCTP_ADDR_OVER)) {
1748 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1756 /* Auto-connect, if we aren't connected already. */
1757 if (sctp_state(asoc, CLOSED)) {
1758 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1761 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1764 /* Break the message into multiple chunks of maximum size. */
1765 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1771 /* Now send the (possibly) fragmented message. */
1772 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1773 sctp_chunk_hold(chunk);
1775 /* Do accounting for the write space. */
1776 sctp_set_owner_w(chunk);
1778 chunk->transport = chunk_tp;
1780 /* Send it to the lower layers. Note: all chunks
1781 * must either fail or succeed. The lower layer
1782 * works that way today. Keep it that way or this
1785 err = sctp_primitive_SEND(asoc, chunk);
1786 /* Did the lower layer accept the chunk? */
1788 sctp_chunk_free(chunk);
1789 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1792 sctp_datamsg_put(datamsg);
1798 /* If we are already past ASSOCIATE, the lower
1799 * layers are responsible for association cleanup.
1805 sctp_association_free(asoc);
1807 sctp_release_sock(sk);
1810 return sctp_error(sk, msg_flags, err);
1817 err = sock_error(sk);
1827 /* This is an extended version of skb_pull() that removes the data from the
1828 * start of a skb even when data is spread across the list of skb's in the
1829 * frag_list. len specifies the total amount of data that needs to be removed.
1830 * when 'len' bytes could be removed from the skb, it returns 0.
1831 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1832 * could not be removed.
1834 static int sctp_skb_pull(struct sk_buff *skb, int len)
1836 struct sk_buff *list;
1837 int skb_len = skb_headlen(skb);
1840 if (len <= skb_len) {
1841 __skb_pull(skb, len);
1845 __skb_pull(skb, skb_len);
1847 for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
1848 rlen = sctp_skb_pull(list, len);
1849 skb->len -= (len-rlen);
1850 skb->data_len -= (len-rlen);
1861 /* API 3.1.3 recvmsg() - UDP Style Syntax
1863 * ssize_t recvmsg(int socket, struct msghdr *message,
1866 * socket - the socket descriptor of the endpoint.
1867 * message - pointer to the msghdr structure which contains a single
1868 * user message and possibly some ancillary data.
1870 * See Section 5 for complete description of the data
1873 * flags - flags sent or received with the user message, see Section
1874 * 5 for complete description of the flags.
1876 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1878 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1879 struct msghdr *msg, size_t len, int noblock,
1880 int flags, int *addr_len)
1882 struct sctp_ulpevent *event = NULL;
1883 struct sctp_sock *sp = sctp_sk(sk);
1884 struct sk_buff *skb;
1889 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1890 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1891 "len", len, "knoblauch", noblock,
1892 "flags", flags, "addr_len", addr_len);
1896 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1901 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1905 /* Get the total length of the skb including any skb's in the
1914 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1916 event = sctp_skb2event(skb);
1921 sock_recv_timestamp(msg, sk, skb);
1922 if (sctp_ulpevent_is_notification(event)) {
1923 msg->msg_flags |= MSG_NOTIFICATION;
1924 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1926 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1929 /* Check if we allow SCTP_SNDRCVINFO. */
1930 if (sp->subscribe.sctp_data_io_event)
1931 sctp_ulpevent_read_sndrcvinfo(event, msg);
1933 /* FIXME: we should be calling IP/IPv6 layers. */
1934 if (sk->sk_protinfo.af_inet.cmsg_flags)
1935 ip_cmsg_recv(msg, skb);
1940 /* If skb's length exceeds the user's buffer, update the skb and
1941 * push it back to the receive_queue so that the next call to
1942 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1944 if (skb_len > copied) {
1945 msg->msg_flags &= ~MSG_EOR;
1946 if (flags & MSG_PEEK)
1948 sctp_skb_pull(skb, copied);
1949 skb_queue_head(&sk->sk_receive_queue, skb);
1951 /* When only partial message is copied to the user, increase
1952 * rwnd by that amount. If all the data in the skb is read,
1953 * rwnd is updated when the event is freed.
1955 if (!sctp_ulpevent_is_notification(event))
1956 sctp_assoc_rwnd_increase(event->asoc, copied);
1958 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
1959 (event->msg_flags & MSG_EOR))
1960 msg->msg_flags |= MSG_EOR;
1962 msg->msg_flags &= ~MSG_EOR;
1965 if (flags & MSG_PEEK) {
1966 /* Release the skb reference acquired after peeking the skb in
1967 * sctp_skb_recv_datagram().
1971 /* Free the event which includes releasing the reference to
1972 * the owner of the skb, freeing the skb and updating the
1975 sctp_ulpevent_free(event);
1978 sctp_release_sock(sk);
1982 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1984 * This option is a on/off flag. If enabled no SCTP message
1985 * fragmentation will be performed. Instead if a message being sent
1986 * exceeds the current PMTU size, the message will NOT be sent and
1987 * instead a error will be indicated to the user.
1989 static int sctp_setsockopt_disable_fragments(struct sock *sk,
1990 char __user *optval, int optlen)
1994 if (optlen < sizeof(int))
1997 if (get_user(val, (int __user *)optval))
2000 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2005 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2008 if (optlen > sizeof(struct sctp_event_subscribe))
2010 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2015 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2017 * This socket option is applicable to the UDP-style socket only. When
2018 * set it will cause associations that are idle for more than the
2019 * specified number of seconds to automatically close. An association
2020 * being idle is defined an association that has NOT sent or received
2021 * user data. The special value of '0' indicates that no automatic
2022 * close of any associations should be performed. The option expects an
2023 * integer defining the number of seconds of idle time before an
2024 * association is closed.
2026 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2029 struct sctp_sock *sp = sctp_sk(sk);
2031 /* Applicable to UDP-style socket only */
2032 if (sctp_style(sk, TCP))
2034 if (optlen != sizeof(int))
2036 if (copy_from_user(&sp->autoclose, optval, optlen))
2042 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2044 * Applications can enable or disable heartbeats for any peer address of
2045 * an association, modify an address's heartbeat interval, force a
2046 * heartbeat to be sent immediately, and adjust the address's maximum
2047 * number of retransmissions sent before an address is considered
2048 * unreachable. The following structure is used to access and modify an
2049 * address's parameters:
2051 * struct sctp_paddrparams {
2052 * sctp_assoc_t spp_assoc_id;
2053 * struct sockaddr_storage spp_address;
2054 * uint32_t spp_hbinterval;
2055 * uint16_t spp_pathmaxrxt;
2056 * uint32_t spp_pathmtu;
2057 * uint32_t spp_sackdelay;
2058 * uint32_t spp_flags;
2061 * spp_assoc_id - (one-to-many style socket) This is filled in the
2062 * application, and identifies the association for
2064 * spp_address - This specifies which address is of interest.
2065 * spp_hbinterval - This contains the value of the heartbeat interval,
2066 * in milliseconds. If a value of zero
2067 * is present in this field then no changes are to
2068 * be made to this parameter.
2069 * spp_pathmaxrxt - This contains the maximum number of
2070 * retransmissions before this address shall be
2071 * considered unreachable. If a value of zero
2072 * is present in this field then no changes are to
2073 * be made to this parameter.
2074 * spp_pathmtu - When Path MTU discovery is disabled the value
2075 * specified here will be the "fixed" path mtu.
2076 * Note that if the spp_address field is empty
2077 * then all associations on this address will
2078 * have this fixed path mtu set upon them.
2080 * spp_sackdelay - When delayed sack is enabled, this value specifies
2081 * the number of milliseconds that sacks will be delayed
2082 * for. This value will apply to all addresses of an
2083 * association if the spp_address field is empty. Note
2084 * also, that if delayed sack is enabled and this
2085 * value is set to 0, no change is made to the last
2086 * recorded delayed sack timer value.
2088 * spp_flags - These flags are used to control various features
2089 * on an association. The flag field may contain
2090 * zero or more of the following options.
2092 * SPP_HB_ENABLE - Enable heartbeats on the
2093 * specified address. Note that if the address
2094 * field is empty all addresses for the association
2095 * have heartbeats enabled upon them.
2097 * SPP_HB_DISABLE - Disable heartbeats on the
2098 * speicifed address. Note that if the address
2099 * field is empty all addresses for the association
2100 * will have their heartbeats disabled. Note also
2101 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2102 * mutually exclusive, only one of these two should
2103 * be specified. Enabling both fields will have
2104 * undetermined results.
2106 * SPP_HB_DEMAND - Request a user initiated heartbeat
2107 * to be made immediately.
2109 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2110 * heartbeat delayis to be set to the value of 0
2113 * SPP_PMTUD_ENABLE - This field will enable PMTU
2114 * discovery upon the specified address. Note that
2115 * if the address feild is empty then all addresses
2116 * on the association are effected.
2118 * SPP_PMTUD_DISABLE - This field will disable PMTU
2119 * discovery upon the specified address. Note that
2120 * if the address feild is empty then all addresses
2121 * on the association are effected. Not also that
2122 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2123 * exclusive. Enabling both will have undetermined
2126 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2127 * on delayed sack. The time specified in spp_sackdelay
2128 * is used to specify the sack delay for this address. Note
2129 * that if spp_address is empty then all addresses will
2130 * enable delayed sack and take on the sack delay
2131 * value specified in spp_sackdelay.
2132 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2133 * off delayed sack. If the spp_address field is blank then
2134 * delayed sack is disabled for the entire association. Note
2135 * also that this field is mutually exclusive to
2136 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2139 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2140 struct sctp_transport *trans,
2141 struct sctp_association *asoc,
2142 struct sctp_sock *sp,
2145 int sackdelay_change)
2149 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2150 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2155 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2156 * this field is ignored. Note also that a value of zero indicates
2157 * the current setting should be left unchanged.
2159 if (params->spp_flags & SPP_HB_ENABLE) {
2161 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2162 * set. This lets us use 0 value when this flag
2165 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2166 params->spp_hbinterval = 0;
2168 if (params->spp_hbinterval ||
2169 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2172 msecs_to_jiffies(params->spp_hbinterval);
2175 msecs_to_jiffies(params->spp_hbinterval);
2177 sp->hbinterval = params->spp_hbinterval;
2184 trans->param_flags =
2185 (trans->param_flags & ~SPP_HB) | hb_change;
2188 (asoc->param_flags & ~SPP_HB) | hb_change;
2191 (sp->param_flags & ~SPP_HB) | hb_change;
2195 /* When Path MTU discovery is disabled the value specified here will
2196 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2197 * include the flag SPP_PMTUD_DISABLE for this field to have any
2200 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2202 trans->pathmtu = params->spp_pathmtu;
2203 sctp_assoc_sync_pmtu(asoc);
2205 asoc->pathmtu = params->spp_pathmtu;
2206 sctp_frag_point(sp, params->spp_pathmtu);
2208 sp->pathmtu = params->spp_pathmtu;
2214 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2215 (params->spp_flags & SPP_PMTUD_ENABLE);
2216 trans->param_flags =
2217 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2219 sctp_transport_pmtu(trans);
2220 sctp_assoc_sync_pmtu(asoc);
2224 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2227 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2231 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2232 * value of this field is ignored. Note also that a value of zero
2233 * indicates the current setting should be left unchanged.
2235 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2238 msecs_to_jiffies(params->spp_sackdelay);
2241 msecs_to_jiffies(params->spp_sackdelay);
2243 sp->sackdelay = params->spp_sackdelay;
2247 if (sackdelay_change) {
2249 trans->param_flags =
2250 (trans->param_flags & ~SPP_SACKDELAY) |
2254 (asoc->param_flags & ~SPP_SACKDELAY) |
2258 (sp->param_flags & ~SPP_SACKDELAY) |
2263 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2264 * of this field is ignored. Note also that a value of zero
2265 * indicates the current setting should be left unchanged.
2267 if ((params->spp_flags & SPP_PMTUD_ENABLE) && params->spp_pathmaxrxt) {
2269 trans->pathmaxrxt = params->spp_pathmaxrxt;
2271 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2273 sp->pathmaxrxt = params->spp_pathmaxrxt;
2280 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2281 char __user *optval, int optlen)
2283 struct sctp_paddrparams params;
2284 struct sctp_transport *trans = NULL;
2285 struct sctp_association *asoc = NULL;
2286 struct sctp_sock *sp = sctp_sk(sk);
2288 int hb_change, pmtud_change, sackdelay_change;
2290 if (optlen != sizeof(struct sctp_paddrparams))
2293 if (copy_from_user(¶ms, optval, optlen))
2296 /* Validate flags and value parameters. */
2297 hb_change = params.spp_flags & SPP_HB;
2298 pmtud_change = params.spp_flags & SPP_PMTUD;
2299 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2301 if (hb_change == SPP_HB ||
2302 pmtud_change == SPP_PMTUD ||
2303 sackdelay_change == SPP_SACKDELAY ||
2304 params.spp_sackdelay > 500 ||
2306 && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2309 /* If an address other than INADDR_ANY is specified, and
2310 * no transport is found, then the request is invalid.
2312 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2313 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2314 params.spp_assoc_id);
2319 /* Get association, if assoc_id != 0 and the socket is a one
2320 * to many style socket, and an association was not found, then
2321 * the id was invalid.
2323 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2324 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2327 /* Heartbeat demand can only be sent on a transport or
2328 * association, but not a socket.
2330 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2333 /* Process parameters. */
2334 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2335 hb_change, pmtud_change,
2341 /* If changes are for association, also apply parameters to each
2344 if (!trans && asoc) {
2345 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2347 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2348 hb_change, pmtud_change,
2357 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2359 * This option will effect the way delayed acks are performed. This
2360 * option allows you to get or set the delayed ack time, in
2361 * milliseconds. It also allows changing the delayed ack frequency.
2362 * Changing the frequency to 1 disables the delayed sack algorithm. If
2363 * the assoc_id is 0, then this sets or gets the endpoints default
2364 * values. If the assoc_id field is non-zero, then the set or get
2365 * effects the specified association for the one to many model (the
2366 * assoc_id field is ignored by the one to one model). Note that if
2367 * sack_delay or sack_freq are 0 when setting this option, then the
2368 * current values will remain unchanged.
2370 * struct sctp_sack_info {
2371 * sctp_assoc_t sack_assoc_id;
2372 * uint32_t sack_delay;
2373 * uint32_t sack_freq;
2376 * sack_assoc_id - This parameter, indicates which association the user
2377 * is performing an action upon. Note that if this field's value is
2378 * zero then the endpoints default value is changed (effecting future
2379 * associations only).
2381 * sack_delay - This parameter contains the number of milliseconds that
2382 * the user is requesting the delayed ACK timer be set to. Note that
2383 * this value is defined in the standard to be between 200 and 500
2386 * sack_freq - This parameter contains the number of packets that must
2387 * be received before a sack is sent without waiting for the delay
2388 * timer to expire. The default value for this is 2, setting this
2389 * value to 1 will disable the delayed sack algorithm.
2392 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2393 char __user *optval, int optlen)
2395 struct sctp_sack_info params;
2396 struct sctp_transport *trans = NULL;
2397 struct sctp_association *asoc = NULL;
2398 struct sctp_sock *sp = sctp_sk(sk);
2400 if (optlen == sizeof(struct sctp_sack_info)) {
2401 if (copy_from_user(¶ms, optval, optlen))
2404 if (params.sack_delay == 0 && params.sack_freq == 0)
2406 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2407 printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
2408 "in delayed_ack socket option deprecated\n");
2409 printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
2410 if (copy_from_user(¶ms, optval, optlen))
2413 if (params.sack_delay == 0)
2414 params.sack_freq = 1;
2416 params.sack_freq = 0;
2420 /* Validate value parameter. */
2421 if (params.sack_delay > 500)
2424 /* Get association, if sack_assoc_id != 0 and the socket is a one
2425 * to many style socket, and an association was not found, then
2426 * the id was invalid.
2428 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2429 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2432 if (params.sack_delay) {
2435 msecs_to_jiffies(params.sack_delay);
2437 (asoc->param_flags & ~SPP_SACKDELAY) |
2438 SPP_SACKDELAY_ENABLE;
2440 sp->sackdelay = params.sack_delay;
2442 (sp->param_flags & ~SPP_SACKDELAY) |
2443 SPP_SACKDELAY_ENABLE;
2447 if (params.sack_freq == 1) {
2450 (asoc->param_flags & ~SPP_SACKDELAY) |
2451 SPP_SACKDELAY_DISABLE;
2454 (sp->param_flags & ~SPP_SACKDELAY) |
2455 SPP_SACKDELAY_DISABLE;
2457 } else if (params.sack_freq > 1) {
2459 asoc->sackfreq = params.sack_freq;
2461 (asoc->param_flags & ~SPP_SACKDELAY) |
2462 SPP_SACKDELAY_ENABLE;
2464 sp->sackfreq = params.sack_freq;
2466 (sp->param_flags & ~SPP_SACKDELAY) |
2467 SPP_SACKDELAY_ENABLE;
2471 /* If change is for association, also apply to each transport. */
2473 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2475 if (params.sack_delay) {
2477 msecs_to_jiffies(params.sack_delay);
2478 trans->param_flags =
2479 (trans->param_flags & ~SPP_SACKDELAY) |
2480 SPP_SACKDELAY_ENABLE;
2482 if (params.sack_freq == 1) {
2483 trans->param_flags =
2484 (trans->param_flags & ~SPP_SACKDELAY) |
2485 SPP_SACKDELAY_DISABLE;
2486 } else if (params.sack_freq > 1) {
2487 trans->sackfreq = params.sack_freq;
2488 trans->param_flags =
2489 (trans->param_flags & ~SPP_SACKDELAY) |
2490 SPP_SACKDELAY_ENABLE;
2498 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2500 * Applications can specify protocol parameters for the default association
2501 * initialization. The option name argument to setsockopt() and getsockopt()
2504 * Setting initialization parameters is effective only on an unconnected
2505 * socket (for UDP-style sockets only future associations are effected
2506 * by the change). With TCP-style sockets, this option is inherited by
2507 * sockets derived from a listener socket.
2509 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, int optlen)
2511 struct sctp_initmsg sinit;
2512 struct sctp_sock *sp = sctp_sk(sk);
2514 if (optlen != sizeof(struct sctp_initmsg))
2516 if (copy_from_user(&sinit, optval, optlen))
2519 if (sinit.sinit_num_ostreams)
2520 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2521 if (sinit.sinit_max_instreams)
2522 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2523 if (sinit.sinit_max_attempts)
2524 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2525 if (sinit.sinit_max_init_timeo)
2526 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2532 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2534 * Applications that wish to use the sendto() system call may wish to
2535 * specify a default set of parameters that would normally be supplied
2536 * through the inclusion of ancillary data. This socket option allows
2537 * such an application to set the default sctp_sndrcvinfo structure.
2538 * The application that wishes to use this socket option simply passes
2539 * in to this call the sctp_sndrcvinfo structure defined in Section
2540 * 5.2.2) The input parameters accepted by this call include
2541 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2542 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2543 * to this call if the caller is using the UDP model.
2545 static int sctp_setsockopt_default_send_param(struct sock *sk,
2546 char __user *optval, int optlen)
2548 struct sctp_sndrcvinfo info;
2549 struct sctp_association *asoc;
2550 struct sctp_sock *sp = sctp_sk(sk);
2552 if (optlen != sizeof(struct sctp_sndrcvinfo))
2554 if (copy_from_user(&info, optval, optlen))
2557 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2558 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2562 asoc->default_stream = info.sinfo_stream;
2563 asoc->default_flags = info.sinfo_flags;
2564 asoc->default_ppid = info.sinfo_ppid;
2565 asoc->default_context = info.sinfo_context;
2566 asoc->default_timetolive = info.sinfo_timetolive;
2568 sp->default_stream = info.sinfo_stream;
2569 sp->default_flags = info.sinfo_flags;
2570 sp->default_ppid = info.sinfo_ppid;
2571 sp->default_context = info.sinfo_context;
2572 sp->default_timetolive = info.sinfo_timetolive;
2578 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2580 * Requests that the local SCTP stack use the enclosed peer address as
2581 * the association primary. The enclosed address must be one of the
2582 * association peer's addresses.
2584 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2587 struct sctp_prim prim;
2588 struct sctp_transport *trans;
2590 if (optlen != sizeof(struct sctp_prim))
2593 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2596 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2600 sctp_assoc_set_primary(trans->asoc, trans);
2606 * 7.1.5 SCTP_NODELAY
2608 * Turn on/off any Nagle-like algorithm. This means that packets are
2609 * generally sent as soon as possible and no unnecessary delays are
2610 * introduced, at the cost of more packets in the network. Expects an
2611 * integer boolean flag.
2613 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2618 if (optlen < sizeof(int))
2620 if (get_user(val, (int __user *)optval))
2623 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2629 * 7.1.1 SCTP_RTOINFO
2631 * The protocol parameters used to initialize and bound retransmission
2632 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2633 * and modify these parameters.
2634 * All parameters are time values, in milliseconds. A value of 0, when
2635 * modifying the parameters, indicates that the current value should not
2639 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, int optlen) {
2640 struct sctp_rtoinfo rtoinfo;
2641 struct sctp_association *asoc;
2643 if (optlen != sizeof (struct sctp_rtoinfo))
2646 if (copy_from_user(&rtoinfo, optval, optlen))
2649 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2651 /* Set the values to the specific association */
2652 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2656 if (rtoinfo.srto_initial != 0)
2658 msecs_to_jiffies(rtoinfo.srto_initial);
2659 if (rtoinfo.srto_max != 0)
2660 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2661 if (rtoinfo.srto_min != 0)
2662 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2664 /* If there is no association or the association-id = 0
2665 * set the values to the endpoint.
2667 struct sctp_sock *sp = sctp_sk(sk);
2669 if (rtoinfo.srto_initial != 0)
2670 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2671 if (rtoinfo.srto_max != 0)
2672 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2673 if (rtoinfo.srto_min != 0)
2674 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2682 * 7.1.2 SCTP_ASSOCINFO
2684 * This option is used to tune the maximum retransmission attempts
2685 * of the association.
2686 * Returns an error if the new association retransmission value is
2687 * greater than the sum of the retransmission value of the peer.
2688 * See [SCTP] for more information.
2691 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int optlen)
2694 struct sctp_assocparams assocparams;
2695 struct sctp_association *asoc;
2697 if (optlen != sizeof(struct sctp_assocparams))
2699 if (copy_from_user(&assocparams, optval, optlen))
2702 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2704 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2707 /* Set the values to the specific association */
2709 if (assocparams.sasoc_asocmaxrxt != 0) {
2712 struct sctp_transport *peer_addr;
2714 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2716 path_sum += peer_addr->pathmaxrxt;
2720 /* Only validate asocmaxrxt if we have more then
2721 * one path/transport. We do this because path
2722 * retransmissions are only counted when we have more
2726 assocparams.sasoc_asocmaxrxt > path_sum)
2729 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2732 if (assocparams.sasoc_cookie_life != 0) {
2733 asoc->cookie_life.tv_sec =
2734 assocparams.sasoc_cookie_life / 1000;
2735 asoc->cookie_life.tv_usec =
2736 (assocparams.sasoc_cookie_life % 1000)
2740 /* Set the values to the endpoint */
2741 struct sctp_sock *sp = sctp_sk(sk);
2743 if (assocparams.sasoc_asocmaxrxt != 0)
2744 sp->assocparams.sasoc_asocmaxrxt =
2745 assocparams.sasoc_asocmaxrxt;
2746 if (assocparams.sasoc_cookie_life != 0)
2747 sp->assocparams.sasoc_cookie_life =
2748 assocparams.sasoc_cookie_life;
2754 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2756 * This socket option is a boolean flag which turns on or off mapped V4
2757 * addresses. If this option is turned on and the socket is type
2758 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2759 * If this option is turned off, then no mapping will be done of V4
2760 * addresses and a user will receive both PF_INET6 and PF_INET type
2761 * addresses on the socket.
2763 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, int optlen)
2766 struct sctp_sock *sp = sctp_sk(sk);
2768 if (optlen < sizeof(int))
2770 if (get_user(val, (int __user *)optval))
2781 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2783 * This socket option specifies the maximum size to put in any outgoing
2784 * SCTP chunk. If a message is larger than this size it will be
2785 * fragmented by SCTP into the specified size. Note that the underlying
2786 * SCTP implementation may fragment into smaller sized chunks when the
2787 * PMTU of the underlying association is smaller than the value set by
2790 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optlen)
2792 struct sctp_association *asoc;
2793 struct sctp_sock *sp = sctp_sk(sk);
2796 if (optlen < sizeof(int))
2798 if (get_user(val, (int __user *)optval))
2800 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2802 sp->user_frag = val;
2804 /* Update the frag_point of the existing associations. */
2805 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
2806 asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
2814 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2816 * Requests that the peer mark the enclosed address as the association
2817 * primary. The enclosed address must be one of the association's
2818 * locally bound addresses. The following structure is used to make a
2819 * set primary request:
2821 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2824 struct sctp_sock *sp;
2825 struct sctp_endpoint *ep;
2826 struct sctp_association *asoc = NULL;
2827 struct sctp_setpeerprim prim;
2828 struct sctp_chunk *chunk;
2834 if (!sctp_addip_enable)
2837 if (optlen != sizeof(struct sctp_setpeerprim))
2840 if (copy_from_user(&prim, optval, optlen))
2843 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2847 if (!asoc->peer.asconf_capable)
2850 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2853 if (!sctp_state(asoc, ESTABLISHED))
2856 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2857 return -EADDRNOTAVAIL;
2859 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2860 chunk = sctp_make_asconf_set_prim(asoc,
2861 (union sctp_addr *)&prim.sspp_addr);
2865 err = sctp_send_asconf(asoc, chunk);
2867 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2872 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2875 struct sctp_setadaptation adaptation;
2877 if (optlen != sizeof(struct sctp_setadaptation))
2879 if (copy_from_user(&adaptation, optval, optlen))
2882 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
2888 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2890 * The context field in the sctp_sndrcvinfo structure is normally only
2891 * used when a failed message is retrieved holding the value that was
2892 * sent down on the actual send call. This option allows the setting of
2893 * a default context on an association basis that will be received on
2894 * reading messages from the peer. This is especially helpful in the
2895 * one-2-many model for an application to keep some reference to an
2896 * internal state machine that is processing messages on the
2897 * association. Note that the setting of this value only effects
2898 * received messages from the peer and does not effect the value that is
2899 * saved with outbound messages.
2901 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
2904 struct sctp_assoc_value params;
2905 struct sctp_sock *sp;
2906 struct sctp_association *asoc;
2908 if (optlen != sizeof(struct sctp_assoc_value))
2910 if (copy_from_user(¶ms, optval, optlen))
2915 if (params.assoc_id != 0) {
2916 asoc = sctp_id2assoc(sk, params.assoc_id);
2919 asoc->default_rcv_context = params.assoc_value;
2921 sp->default_rcv_context = params.assoc_value;
2928 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2930 * This options will at a minimum specify if the implementation is doing
2931 * fragmented interleave. Fragmented interleave, for a one to many
2932 * socket, is when subsequent calls to receive a message may return
2933 * parts of messages from different associations. Some implementations
2934 * may allow you to turn this value on or off. If so, when turned off,
2935 * no fragment interleave will occur (which will cause a head of line
2936 * blocking amongst multiple associations sharing the same one to many
2937 * socket). When this option is turned on, then each receive call may
2938 * come from a different association (thus the user must receive data
2939 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2940 * association each receive belongs to.
2942 * This option takes a boolean value. A non-zero value indicates that
2943 * fragmented interleave is on. A value of zero indicates that
2944 * fragmented interleave is off.
2946 * Note that it is important that an implementation that allows this
2947 * option to be turned on, have it off by default. Otherwise an unaware
2948 * application using the one to many model may become confused and act
2951 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
2952 char __user *optval,
2957 if (optlen != sizeof(int))
2959 if (get_user(val, (int __user *)optval))
2962 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
2968 * 7.1.25. Set or Get the sctp partial delivery point
2969 * (SCTP_PARTIAL_DELIVERY_POINT)
2970 * This option will set or get the SCTP partial delivery point. This
2971 * point is the size of a message where the partial delivery API will be
2972 * invoked to help free up rwnd space for the peer. Setting this to a
2973 * lower value will cause partial delivery's to happen more often. The
2974 * calls argument is an integer that sets or gets the partial delivery
2977 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
2978 char __user *optval,
2983 if (optlen != sizeof(u32))
2985 if (get_user(val, (int __user *)optval))
2988 sctp_sk(sk)->pd_point = val;
2990 return 0; /* is this the right error code? */
2994 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2996 * This option will allow a user to change the maximum burst of packets
2997 * that can be emitted by this association. Note that the default value
2998 * is 4, and some implementations may restrict this setting so that it
2999 * can only be lowered.
3001 * NOTE: This text doesn't seem right. Do this on a socket basis with
3002 * future associations inheriting the socket value.
3004 static int sctp_setsockopt_maxburst(struct sock *sk,
3005 char __user *optval,
3008 struct sctp_assoc_value params;
3009 struct sctp_sock *sp;
3010 struct sctp_association *asoc;
3014 if (optlen < sizeof(int))
3017 if (optlen == sizeof(int)) {
3019 "SCTP: Use of int in max_burst socket option deprecated\n");
3021 "SCTP: Use struct sctp_assoc_value instead\n");
3022 if (copy_from_user(&val, optval, optlen))
3024 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3025 if (copy_from_user(¶ms, optval, optlen))
3027 val = params.assoc_value;
3028 assoc_id = params.assoc_id;
3034 if (assoc_id != 0) {
3035 asoc = sctp_id2assoc(sk, assoc_id);
3038 asoc->max_burst = val;
3040 sp->max_burst = val;
3046 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3048 * This set option adds a chunk type that the user is requesting to be
3049 * received only in an authenticated way. Changes to the list of chunks
3050 * will only effect future associations on the socket.
3052 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3053 char __user *optval,
3056 struct sctp_authchunk val;
3058 if (!sctp_auth_enable)
3061 if (optlen != sizeof(struct sctp_authchunk))
3063 if (copy_from_user(&val, optval, optlen))
3066 switch (val.sauth_chunk) {
3068 case SCTP_CID_INIT_ACK:
3069 case SCTP_CID_SHUTDOWN_COMPLETE:
3074 /* add this chunk id to the endpoint */
3075 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3079 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3081 * This option gets or sets the list of HMAC algorithms that the local
3082 * endpoint requires the peer to use.
3084 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3085 char __user *optval,
3088 struct sctp_hmacalgo *hmacs;
3092 if (!sctp_auth_enable)
3095 if (optlen < sizeof(struct sctp_hmacalgo))
3098 hmacs = kmalloc(optlen, GFP_KERNEL);
3102 if (copy_from_user(hmacs, optval, optlen)) {
3107 idents = hmacs->shmac_num_idents;
3108 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3109 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3114 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3121 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3123 * This option will set a shared secret key which is used to build an
3124 * association shared key.
3126 static int sctp_setsockopt_auth_key(struct sock *sk,
3127 char __user *optval,
3130 struct sctp_authkey *authkey;
3131 struct sctp_association *asoc;
3134 if (!sctp_auth_enable)
3137 if (optlen <= sizeof(struct sctp_authkey))
3140 authkey = kmalloc(optlen, GFP_KERNEL);
3144 if (copy_from_user(authkey, optval, optlen)) {
3149 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3154 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3155 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3160 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3167 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3169 * This option will get or set the active shared key to be used to build
3170 * the association shared key.
3172 static int sctp_setsockopt_active_key(struct sock *sk,
3173 char __user *optval,
3176 struct sctp_authkeyid val;
3177 struct sctp_association *asoc;
3179 if (!sctp_auth_enable)
3182 if (optlen != sizeof(struct sctp_authkeyid))
3184 if (copy_from_user(&val, optval, optlen))
3187 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3188 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3191 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3192 val.scact_keynumber);
3196 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3198 * This set option will delete a shared secret key from use.
3200 static int sctp_setsockopt_del_key(struct sock *sk,
3201 char __user *optval,
3204 struct sctp_authkeyid val;
3205 struct sctp_association *asoc;
3207 if (!sctp_auth_enable)
3210 if (optlen != sizeof(struct sctp_authkeyid))
3212 if (copy_from_user(&val, optval, optlen))
3215 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3216 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3219 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3220 val.scact_keynumber);
3225 /* API 6.2 setsockopt(), getsockopt()
3227 * Applications use setsockopt() and getsockopt() to set or retrieve
3228 * socket options. Socket options are used to change the default
3229 * behavior of sockets calls. They are described in Section 7.
3233 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3234 * int __user *optlen);
3235 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3238 * sd - the socket descript.
3239 * level - set to IPPROTO_SCTP for all SCTP options.
3240 * optname - the option name.
3241 * optval - the buffer to store the value of the option.
3242 * optlen - the size of the buffer.
3244 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3245 char __user *optval, int optlen)
3249 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3252 /* I can hardly begin to describe how wrong this is. This is
3253 * so broken as to be worse than useless. The API draft
3254 * REALLY is NOT helpful here... I am not convinced that the
3255 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3256 * are at all well-founded.
3258 if (level != SOL_SCTP) {
3259 struct sctp_af *af = sctp_sk(sk)->pf->af;
3260 retval = af->setsockopt(sk, level, optname, optval, optlen);
3267 case SCTP_SOCKOPT_BINDX_ADD:
3268 /* 'optlen' is the size of the addresses buffer. */
3269 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3270 optlen, SCTP_BINDX_ADD_ADDR);
3273 case SCTP_SOCKOPT_BINDX_REM:
3274 /* 'optlen' is the size of the addresses buffer. */
3275 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3276 optlen, SCTP_BINDX_REM_ADDR);
3279 case SCTP_SOCKOPT_CONNECTX_OLD:
3280 /* 'optlen' is the size of the addresses buffer. */
3281 retval = sctp_setsockopt_connectx_old(sk,
3282 (struct sockaddr __user *)optval,
3286 case SCTP_SOCKOPT_CONNECTX:
3287 /* 'optlen' is the size of the addresses buffer. */
3288 retval = sctp_setsockopt_connectx(sk,
3289 (struct sockaddr __user *)optval,
3293 case SCTP_DISABLE_FRAGMENTS:
3294 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3298 retval = sctp_setsockopt_events(sk, optval, optlen);
3301 case SCTP_AUTOCLOSE:
3302 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3305 case SCTP_PEER_ADDR_PARAMS:
3306 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3309 case SCTP_DELAYED_ACK:
3310 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3312 case SCTP_PARTIAL_DELIVERY_POINT:
3313 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3317 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3319 case SCTP_DEFAULT_SEND_PARAM:
3320 retval = sctp_setsockopt_default_send_param(sk, optval,
3323 case SCTP_PRIMARY_ADDR:
3324 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3326 case SCTP_SET_PEER_PRIMARY_ADDR:
3327 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3330 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3333 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3335 case SCTP_ASSOCINFO:
3336 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3338 case SCTP_I_WANT_MAPPED_V4_ADDR:
3339 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3342 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3344 case SCTP_ADAPTATION_LAYER:
3345 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3348 retval = sctp_setsockopt_context(sk, optval, optlen);
3350 case SCTP_FRAGMENT_INTERLEAVE:
3351 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3353 case SCTP_MAX_BURST:
3354 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3356 case SCTP_AUTH_CHUNK:
3357 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3359 case SCTP_HMAC_IDENT:
3360 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3363 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3365 case SCTP_AUTH_ACTIVE_KEY:
3366 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3368 case SCTP_AUTH_DELETE_KEY:
3369 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3372 retval = -ENOPROTOOPT;
3376 sctp_release_sock(sk);
3382 /* API 3.1.6 connect() - UDP Style Syntax
3384 * An application may use the connect() call in the UDP model to initiate an
3385 * association without sending data.
3389 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3391 * sd: the socket descriptor to have a new association added to.
3393 * nam: the address structure (either struct sockaddr_in or struct
3394 * sockaddr_in6 defined in RFC2553 [7]).
3396 * len: the size of the address.
3398 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3406 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3407 __func__, sk, addr, addr_len);
3409 /* Validate addr_len before calling common connect/connectx routine. */
3410 af = sctp_get_af_specific(addr->sa_family);
3411 if (!af || addr_len < af->sockaddr_len) {
3414 /* Pass correct addr len to common routine (so it knows there
3415 * is only one address being passed.
3417 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3420 sctp_release_sock(sk);
3424 /* FIXME: Write comments. */
3425 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3427 return -EOPNOTSUPP; /* STUB */
3430 /* 4.1.4 accept() - TCP Style Syntax
3432 * Applications use accept() call to remove an established SCTP
3433 * association from the accept queue of the endpoint. A new socket
3434 * descriptor will be returned from accept() to represent the newly
3435 * formed association.
3437 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3439 struct sctp_sock *sp;
3440 struct sctp_endpoint *ep;
3441 struct sock *newsk = NULL;
3442 struct sctp_association *asoc;
3451 if (!sctp_style(sk, TCP)) {
3452 error = -EOPNOTSUPP;
3456 if (!sctp_sstate(sk, LISTENING)) {
3461 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3463 error = sctp_wait_for_accept(sk, timeo);
3467 /* We treat the list of associations on the endpoint as the accept
3468 * queue and pick the first association on the list.
3470 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3472 newsk = sp->pf->create_accept_sk(sk, asoc);
3478 /* Populate the fields of the newsk from the oldsk and migrate the
3479 * asoc to the newsk.
3481 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3484 sctp_release_sock(sk);
3489 /* The SCTP ioctl handler. */
3490 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3492 return -ENOIOCTLCMD;
3495 /* This is the function which gets called during socket creation to
3496 * initialized the SCTP-specific portion of the sock.
3497 * The sock structure should already be zero-filled memory.
3499 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3501 struct sctp_endpoint *ep;
3502 struct sctp_sock *sp;
3504 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3508 /* Initialize the SCTP per socket area. */
3509 switch (sk->sk_type) {
3510 case SOCK_SEQPACKET:
3511 sp->type = SCTP_SOCKET_UDP;
3514 sp->type = SCTP_SOCKET_TCP;
3517 return -ESOCKTNOSUPPORT;
3520 /* Initialize default send parameters. These parameters can be
3521 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3523 sp->default_stream = 0;
3524 sp->default_ppid = 0;
3525 sp->default_flags = 0;
3526 sp->default_context = 0;
3527 sp->default_timetolive = 0;
3529 sp->default_rcv_context = 0;
3530 sp->max_burst = sctp_max_burst;
3532 /* Initialize default setup parameters. These parameters
3533 * can be modified with the SCTP_INITMSG socket option or
3534 * overridden by the SCTP_INIT CMSG.
3536 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3537 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3538 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3539 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3541 /* Initialize default RTO related parameters. These parameters can
3542 * be modified for with the SCTP_RTOINFO socket option.
3544 sp->rtoinfo.srto_initial = sctp_rto_initial;
3545 sp->rtoinfo.srto_max = sctp_rto_max;
3546 sp->rtoinfo.srto_min = sctp_rto_min;
3548 /* Initialize default association related parameters. These parameters
3549 * can be modified with the SCTP_ASSOCINFO socket option.
3551 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3552 sp->assocparams.sasoc_number_peer_destinations = 0;
3553 sp->assocparams.sasoc_peer_rwnd = 0;
3554 sp->assocparams.sasoc_local_rwnd = 0;
3555 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3557 /* Initialize default event subscriptions. By default, all the
3560 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3562 /* Default Peer Address Parameters. These defaults can
3563 * be modified via SCTP_PEER_ADDR_PARAMS
3565 sp->hbinterval = sctp_hb_interval;
3566 sp->pathmaxrxt = sctp_max_retrans_path;
3567 sp->pathmtu = 0; // allow default discovery
3568 sp->sackdelay = sctp_sack_timeout;
3570 sp->param_flags = SPP_HB_ENABLE |
3572 SPP_SACKDELAY_ENABLE;
3574 /* If enabled no SCTP message fragmentation will be performed.
3575 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3577 sp->disable_fragments = 0;
3579 /* Enable Nagle algorithm by default. */
3582 /* Enable by default. */
3585 /* Auto-close idle associations after the configured
3586 * number of seconds. A value of 0 disables this
3587 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3588 * for UDP-style sockets only.
3592 /* User specified fragmentation limit. */
3595 sp->adaptation_ind = 0;
3597 sp->pf = sctp_get_pf_specific(sk->sk_family);
3599 /* Control variables for partial data delivery. */
3600 atomic_set(&sp->pd_mode, 0);
3601 skb_queue_head_init(&sp->pd_lobby);
3602 sp->frag_interleave = 0;
3604 /* Create a per socket endpoint structure. Even if we
3605 * change the data structure relationships, this may still
3606 * be useful for storing pre-connect address information.
3608 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3615 SCTP_DBG_OBJCNT_INC(sock);
3616 percpu_counter_inc(&sctp_sockets_allocated);
3619 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3625 /* Cleanup any SCTP per socket resources. */
3626 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3628 struct sctp_endpoint *ep;
3630 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3632 /* Release our hold on the endpoint. */
3633 ep = sctp_sk(sk)->ep;
3634 sctp_endpoint_free(ep);
3635 percpu_counter_dec(&sctp_sockets_allocated);
3637 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3641 /* API 4.1.7 shutdown() - TCP Style Syntax
3642 * int shutdown(int socket, int how);
3644 * sd - the socket descriptor of the association to be closed.
3645 * how - Specifies the type of shutdown. The values are
3648 * Disables further receive operations. No SCTP
3649 * protocol action is taken.
3651 * Disables further send operations, and initiates
3652 * the SCTP shutdown sequence.
3654 * Disables further send and receive operations
3655 * and initiates the SCTP shutdown sequence.
3657 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3659 struct sctp_endpoint *ep;
3660 struct sctp_association *asoc;
3662 if (!sctp_style(sk, TCP))
3665 if (how & SEND_SHUTDOWN) {
3666 ep = sctp_sk(sk)->ep;
3667 if (!list_empty(&ep->asocs)) {
3668 asoc = list_entry(ep->asocs.next,
3669 struct sctp_association, asocs);
3670 sctp_primitive_SHUTDOWN(asoc, NULL);
3675 /* 7.2.1 Association Status (SCTP_STATUS)
3677 * Applications can retrieve current status information about an
3678 * association, including association state, peer receiver window size,
3679 * number of unacked data chunks, and number of data chunks pending
3680 * receipt. This information is read-only.
3682 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3683 char __user *optval,
3686 struct sctp_status status;
3687 struct sctp_association *asoc = NULL;
3688 struct sctp_transport *transport;
3689 sctp_assoc_t associd;
3692 if (len < sizeof(status)) {
3697 len = sizeof(status);
3698 if (copy_from_user(&status, optval, len)) {
3703 associd = status.sstat_assoc_id;
3704 asoc = sctp_id2assoc(sk, associd);
3710 transport = asoc->peer.primary_path;
3712 status.sstat_assoc_id = sctp_assoc2id(asoc);
3713 status.sstat_state = asoc->state;
3714 status.sstat_rwnd = asoc->peer.rwnd;
3715 status.sstat_unackdata = asoc->unack_data;
3717 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3718 status.sstat_instrms = asoc->c.sinit_max_instreams;
3719 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3720 status.sstat_fragmentation_point = asoc->frag_point;
3721 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3722 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3723 transport->af_specific->sockaddr_len);
3724 /* Map ipv4 address into v4-mapped-on-v6 address. */
3725 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3726 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3727 status.sstat_primary.spinfo_state = transport->state;
3728 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3729 status.sstat_primary.spinfo_srtt = transport->srtt;
3730 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3731 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3733 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3734 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3736 if (put_user(len, optlen)) {
3741 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3742 len, status.sstat_state, status.sstat_rwnd,
3743 status.sstat_assoc_id);
3745 if (copy_to_user(optval, &status, len)) {
3755 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3757 * Applications can retrieve information about a specific peer address
3758 * of an association, including its reachability state, congestion
3759 * window, and retransmission timer values. This information is
3762 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3763 char __user *optval,
3766 struct sctp_paddrinfo pinfo;
3767 struct sctp_transport *transport;
3770 if (len < sizeof(pinfo)) {
3775 len = sizeof(pinfo);
3776 if (copy_from_user(&pinfo, optval, len)) {
3781 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3782 pinfo.spinfo_assoc_id);
3786 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3787 pinfo.spinfo_state = transport->state;
3788 pinfo.spinfo_cwnd = transport->cwnd;
3789 pinfo.spinfo_srtt = transport->srtt;
3790 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3791 pinfo.spinfo_mtu = transport->pathmtu;
3793 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3794 pinfo.spinfo_state = SCTP_ACTIVE;
3796 if (put_user(len, optlen)) {
3801 if (copy_to_user(optval, &pinfo, len)) {
3810 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3812 * This option is a on/off flag. If enabled no SCTP message
3813 * fragmentation will be performed. Instead if a message being sent
3814 * exceeds the current PMTU size, the message will NOT be sent and
3815 * instead a error will be indicated to the user.
3817 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3818 char __user *optval, int __user *optlen)
3822 if (len < sizeof(int))
3826 val = (sctp_sk(sk)->disable_fragments == 1);
3827 if (put_user(len, optlen))
3829 if (copy_to_user(optval, &val, len))
3834 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3836 * This socket option is used to specify various notifications and
3837 * ancillary data the user wishes to receive.
3839 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3842 if (len < sizeof(struct sctp_event_subscribe))
3844 len = sizeof(struct sctp_event_subscribe);
3845 if (put_user(len, optlen))
3847 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3852 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3854 * This socket option is applicable to the UDP-style socket only. When
3855 * set it will cause associations that are idle for more than the
3856 * specified number of seconds to automatically close. An association
3857 * being idle is defined an association that has NOT sent or received
3858 * user data. The special value of '0' indicates that no automatic
3859 * close of any associations should be performed. The option expects an
3860 * integer defining the number of seconds of idle time before an
3861 * association is closed.
3863 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3865 /* Applicable to UDP-style socket only */
3866 if (sctp_style(sk, TCP))
3868 if (len < sizeof(int))
3871 if (put_user(len, optlen))
3873 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
3878 /* Helper routine to branch off an association to a new socket. */
3879 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3880 struct socket **sockp)
3882 struct sock *sk = asoc->base.sk;
3883 struct socket *sock;
3884 struct inet_sock *inetsk;
3888 /* An association cannot be branched off from an already peeled-off
3889 * socket, nor is this supported for tcp style sockets.
3891 if (!sctp_style(sk, UDP))
3894 /* Create a new socket. */
3895 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
3899 /* Populate the fields of the newsk from the oldsk and migrate the
3900 * asoc to the newsk.
3902 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
3904 /* Make peeled-off sockets more like 1-1 accepted sockets.
3905 * Set the daddr and initialize id to something more random
3907 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
3908 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
3909 inetsk = inet_sk(sock->sk);
3910 inetsk->id = asoc->next_tsn ^ jiffies;
3917 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
3919 sctp_peeloff_arg_t peeloff;
3920 struct socket *newsock;
3922 struct sctp_association *asoc;
3924 if (len < sizeof(sctp_peeloff_arg_t))
3926 len = sizeof(sctp_peeloff_arg_t);
3927 if (copy_from_user(&peeloff, optval, len))
3930 asoc = sctp_id2assoc(sk, peeloff.associd);
3936 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
3938 retval = sctp_do_peeloff(asoc, &newsock);
3942 /* Map the socket to an unused fd that can be returned to the user. */
3943 retval = sock_map_fd(newsock, 0);
3945 sock_release(newsock);
3949 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3950 __func__, sk, asoc, newsock->sk, retval);
3952 /* Return the fd mapped to the new socket. */
3953 peeloff.sd = retval;
3954 if (put_user(len, optlen))
3956 if (copy_to_user(optval, &peeloff, len))
3963 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3965 * Applications can enable or disable heartbeats for any peer address of
3966 * an association, modify an address's heartbeat interval, force a
3967 * heartbeat to be sent immediately, and adjust the address's maximum
3968 * number of retransmissions sent before an address is considered
3969 * unreachable. The following structure is used to access and modify an
3970 * address's parameters:
3972 * struct sctp_paddrparams {
3973 * sctp_assoc_t spp_assoc_id;
3974 * struct sockaddr_storage spp_address;
3975 * uint32_t spp_hbinterval;
3976 * uint16_t spp_pathmaxrxt;
3977 * uint32_t spp_pathmtu;
3978 * uint32_t spp_sackdelay;
3979 * uint32_t spp_flags;
3982 * spp_assoc_id - (one-to-many style socket) This is filled in the
3983 * application, and identifies the association for
3985 * spp_address - This specifies which address is of interest.
3986 * spp_hbinterval - This contains the value of the heartbeat interval,
3987 * in milliseconds. If a value of zero
3988 * is present in this field then no changes are to
3989 * be made to this parameter.
3990 * spp_pathmaxrxt - This contains the maximum number of
3991 * retransmissions before this address shall be
3992 * considered unreachable. If a value of zero
3993 * is present in this field then no changes are to
3994 * be made to this parameter.
3995 * spp_pathmtu - When Path MTU discovery is disabled the value
3996 * specified here will be the "fixed" path mtu.
3997 * Note that if the spp_address field is empty
3998 * then all associations on this address will
3999 * have this fixed path mtu set upon them.
4001 * spp_sackdelay - When delayed sack is enabled, this value specifies
4002 * the number of milliseconds that sacks will be delayed
4003 * for. This value will apply to all addresses of an
4004 * association if the spp_address field is empty. Note
4005 * also, that if delayed sack is enabled and this
4006 * value is set to 0, no change is made to the last
4007 * recorded delayed sack timer value.
4009 * spp_flags - These flags are used to control various features
4010 * on an association. The flag field may contain
4011 * zero or more of the following options.
4013 * SPP_HB_ENABLE - Enable heartbeats on the
4014 * specified address. Note that if the address
4015 * field is empty all addresses for the association
4016 * have heartbeats enabled upon them.
4018 * SPP_HB_DISABLE - Disable heartbeats on the
4019 * speicifed address. Note that if the address
4020 * field is empty all addresses for the association
4021 * will have their heartbeats disabled. Note also
4022 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4023 * mutually exclusive, only one of these two should
4024 * be specified. Enabling both fields will have
4025 * undetermined results.
4027 * SPP_HB_DEMAND - Request a user initiated heartbeat
4028 * to be made immediately.
4030 * SPP_PMTUD_ENABLE - This field will enable PMTU
4031 * discovery upon the specified address. Note that
4032 * if the address feild is empty then all addresses
4033 * on the association are effected.
4035 * SPP_PMTUD_DISABLE - This field will disable PMTU
4036 * discovery upon the specified address. Note that
4037 * if the address feild is empty then all addresses
4038 * on the association are effected. Not also that
4039 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4040 * exclusive. Enabling both will have undetermined
4043 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4044 * on delayed sack. The time specified in spp_sackdelay
4045 * is used to specify the sack delay for this address. Note
4046 * that if spp_address is empty then all addresses will
4047 * enable delayed sack and take on the sack delay
4048 * value specified in spp_sackdelay.
4049 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4050 * off delayed sack. If the spp_address field is blank then
4051 * delayed sack is disabled for the entire association. Note
4052 * also that this field is mutually exclusive to
4053 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4056 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4057 char __user *optval, int __user *optlen)
4059 struct sctp_paddrparams params;
4060 struct sctp_transport *trans = NULL;
4061 struct sctp_association *asoc = NULL;
4062 struct sctp_sock *sp = sctp_sk(sk);
4064 if (len < sizeof(struct sctp_paddrparams))
4066 len = sizeof(struct sctp_paddrparams);
4067 if (copy_from_user(¶ms, optval, len))
4070 /* If an address other than INADDR_ANY is specified, and
4071 * no transport is found, then the request is invalid.
4073 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4074 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4075 params.spp_assoc_id);
4077 SCTP_DEBUG_PRINTK("Failed no transport\n");
4082 /* Get association, if assoc_id != 0 and the socket is a one
4083 * to many style socket, and an association was not found, then
4084 * the id was invalid.
4086 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4087 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4088 SCTP_DEBUG_PRINTK("Failed no association\n");
4093 /* Fetch transport values. */
4094 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4095 params.spp_pathmtu = trans->pathmtu;
4096 params.spp_pathmaxrxt = trans->pathmaxrxt;
4097 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4099 /*draft-11 doesn't say what to return in spp_flags*/
4100 params.spp_flags = trans->param_flags;
4102 /* Fetch association values. */
4103 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4104 params.spp_pathmtu = asoc->pathmtu;
4105 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4106 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4108 /*draft-11 doesn't say what to return in spp_flags*/
4109 params.spp_flags = asoc->param_flags;
4111 /* Fetch socket values. */
4112 params.spp_hbinterval = sp->hbinterval;
4113 params.spp_pathmtu = sp->pathmtu;
4114 params.spp_sackdelay = sp->sackdelay;
4115 params.spp_pathmaxrxt = sp->pathmaxrxt;
4117 /*draft-11 doesn't say what to return in spp_flags*/
4118 params.spp_flags = sp->param_flags;
4121 if (copy_to_user(optval, ¶ms, len))
4124 if (put_user(len, optlen))
4131 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4133 * This option will effect the way delayed acks are performed. This
4134 * option allows you to get or set the delayed ack time, in
4135 * milliseconds. It also allows changing the delayed ack frequency.
4136 * Changing the frequency to 1 disables the delayed sack algorithm. If
4137 * the assoc_id is 0, then this sets or gets the endpoints default
4138 * values. If the assoc_id field is non-zero, then the set or get
4139 * effects the specified association for the one to many model (the
4140 * assoc_id field is ignored by the one to one model). Note that if
4141 * sack_delay or sack_freq are 0 when setting this option, then the
4142 * current values will remain unchanged.
4144 * struct sctp_sack_info {
4145 * sctp_assoc_t sack_assoc_id;
4146 * uint32_t sack_delay;
4147 * uint32_t sack_freq;
4150 * sack_assoc_id - This parameter, indicates which association the user
4151 * is performing an action upon. Note that if this field's value is
4152 * zero then the endpoints default value is changed (effecting future
4153 * associations only).
4155 * sack_delay - This parameter contains the number of milliseconds that
4156 * the user is requesting the delayed ACK timer be set to. Note that
4157 * this value is defined in the standard to be between 200 and 500
4160 * sack_freq - This parameter contains the number of packets that must
4161 * be received before a sack is sent without waiting for the delay
4162 * timer to expire. The default value for this is 2, setting this
4163 * value to 1 will disable the delayed sack algorithm.
4165 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4166 char __user *optval,
4169 struct sctp_sack_info params;
4170 struct sctp_association *asoc = NULL;
4171 struct sctp_sock *sp = sctp_sk(sk);
4173 if (len >= sizeof(struct sctp_sack_info)) {
4174 len = sizeof(struct sctp_sack_info);
4176 if (copy_from_user(¶ms, optval, len))
4178 } else if (len == sizeof(struct sctp_assoc_value)) {
4179 printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
4180 "in delayed_ack socket option deprecated\n");
4181 printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
4182 if (copy_from_user(¶ms, optval, len))
4187 /* Get association, if sack_assoc_id != 0 and the socket is a one
4188 * to many style socket, and an association was not found, then
4189 * the id was invalid.
4191 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4192 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4196 /* Fetch association values. */
4197 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4198 params.sack_delay = jiffies_to_msecs(
4200 params.sack_freq = asoc->sackfreq;
4203 params.sack_delay = 0;
4204 params.sack_freq = 1;
4207 /* Fetch socket values. */
4208 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4209 params.sack_delay = sp->sackdelay;
4210 params.sack_freq = sp->sackfreq;
4212 params.sack_delay = 0;
4213 params.sack_freq = 1;
4217 if (copy_to_user(optval, ¶ms, len))
4220 if (put_user(len, optlen))
4226 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4228 * Applications can specify protocol parameters for the default association
4229 * initialization. The option name argument to setsockopt() and getsockopt()
4232 * Setting initialization parameters is effective only on an unconnected
4233 * socket (for UDP-style sockets only future associations are effected
4234 * by the change). With TCP-style sockets, this option is inherited by
4235 * sockets derived from a listener socket.
4237 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4239 if (len < sizeof(struct sctp_initmsg))
4241 len = sizeof(struct sctp_initmsg);
4242 if (put_user(len, optlen))
4244 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4249 static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
4250 char __user *optval,
4254 struct sctp_association *asoc;
4255 struct list_head *pos;
4258 if (len < sizeof(sctp_assoc_t))
4261 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4264 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_NUM_OLD "
4265 "socket option deprecated\n");
4266 /* For UDP-style sockets, id specifies the association to query. */
4267 asoc = sctp_id2assoc(sk, id);
4271 list_for_each(pos, &asoc->peer.transport_addr_list) {
4279 * Old API for getting list of peer addresses. Does not work for 32-bit
4280 * programs running on a 64-bit kernel
4282 static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
4283 char __user *optval,
4286 struct sctp_association *asoc;
4288 struct sctp_getaddrs_old getaddrs;
4289 struct sctp_transport *from;
4291 union sctp_addr temp;
4292 struct sctp_sock *sp = sctp_sk(sk);
4295 if (len < sizeof(struct sctp_getaddrs_old))
4298 len = sizeof(struct sctp_getaddrs_old);
4300 if (copy_from_user(&getaddrs, optval, len))
4303 if (getaddrs.addr_num <= 0) return -EINVAL;
4305 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_OLD "
4306 "socket option deprecated\n");
4308 /* For UDP-style sockets, id specifies the association to query. */
4309 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4313 to = (void __user *)getaddrs.addrs;
4314 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4316 memcpy(&temp, &from->ipaddr, sizeof(temp));
4317 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4318 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4319 if (copy_to_user(to, &temp, addrlen))
4323 if (cnt >= getaddrs.addr_num) break;
4325 getaddrs.addr_num = cnt;
4326 if (put_user(len, optlen))
4328 if (copy_to_user(optval, &getaddrs, len))
4334 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4335 char __user *optval, int __user *optlen)
4337 struct sctp_association *asoc;
4339 struct sctp_getaddrs getaddrs;
4340 struct sctp_transport *from;
4342 union sctp_addr temp;
4343 struct sctp_sock *sp = sctp_sk(sk);
4348 if (len < sizeof(struct sctp_getaddrs))
4351 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4354 /* For UDP-style sockets, id specifies the association to query. */
4355 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4359 to = optval + offsetof(struct sctp_getaddrs,addrs);
4360 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4362 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4364 memcpy(&temp, &from->ipaddr, sizeof(temp));
4365 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4366 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4367 if (space_left < addrlen)
4369 if (copy_to_user(to, &temp, addrlen))
4373 space_left -= addrlen;
4376 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4378 bytes_copied = ((char __user *)to) - optval;
4379 if (put_user(bytes_copied, optlen))
4385 static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
4386 char __user *optval,
4390 struct sctp_bind_addr *bp;
4391 struct sctp_association *asoc;
4392 struct sctp_sockaddr_entry *addr;
4395 if (len < sizeof(sctp_assoc_t))
4398 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4401 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_NUM_OLD "
4402 "socket option deprecated\n");
4405 * For UDP-style sockets, id specifies the association to query.
4406 * If the id field is set to the value '0' then the locally bound
4407 * addresses are returned without regard to any particular
4411 bp = &sctp_sk(sk)->ep->base.bind_addr;
4413 asoc = sctp_id2assoc(sk, id);
4416 bp = &asoc->base.bind_addr;
4419 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4420 * addresses from the global local address list.
4422 if (sctp_list_single_entry(&bp->address_list)) {
4423 addr = list_entry(bp->address_list.next,
4424 struct sctp_sockaddr_entry, list);
4425 if (sctp_is_any(sk, &addr->a)) {
4427 list_for_each_entry_rcu(addr,
4428 &sctp_local_addr_list, list) {
4432 if ((PF_INET == sk->sk_family) &&
4433 (AF_INET6 == addr->a.sa.sa_family))
4436 if ((PF_INET6 == sk->sk_family) &&
4437 inet_v6_ipv6only(sk) &&
4438 (AF_INET == addr->a.sa.sa_family))
4450 /* Protection on the bound address list is not needed,
4451 * since in the socket option context we hold the socket lock,
4452 * so there is no way that the bound address list can change.
4454 list_for_each_entry(addr, &bp->address_list, list) {
4461 /* Helper function that copies local addresses to user and returns the number
4462 * of addresses copied.
4464 static int sctp_copy_laddrs_old(struct sock *sk, __u16 port,
4465 int max_addrs, void *to,
4468 struct sctp_sockaddr_entry *addr;
4469 union sctp_addr temp;
4474 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4478 if ((PF_INET == sk->sk_family) &&
4479 (AF_INET6 == addr->a.sa.sa_family))
4481 if ((PF_INET6 == sk->sk_family) &&
4482 inet_v6_ipv6only(sk) &&
4483 (AF_INET == addr->a.sa.sa_family))
4485 memcpy(&temp, &addr->a, sizeof(temp));
4486 if (!temp.v4.sin_port)
4487 temp.v4.sin_port = htons(port);
4489 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4491 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4492 memcpy(to, &temp, addrlen);
4495 *bytes_copied += addrlen;
4497 if (cnt >= max_addrs) break;
4504 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4505 size_t space_left, int *bytes_copied)
4507 struct sctp_sockaddr_entry *addr;
4508 union sctp_addr temp;
4513 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4517 if ((PF_INET == sk->sk_family) &&
4518 (AF_INET6 == addr->a.sa.sa_family))
4520 if ((PF_INET6 == sk->sk_family) &&
4521 inet_v6_ipv6only(sk) &&
4522 (AF_INET == addr->a.sa.sa_family))
4524 memcpy(&temp, &addr->a, sizeof(temp));
4525 if (!temp.v4.sin_port)
4526 temp.v4.sin_port = htons(port);
4528 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4530 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4531 if (space_left < addrlen) {
4535 memcpy(to, &temp, addrlen);
4539 space_left -= addrlen;
4540 *bytes_copied += addrlen;
4547 /* Old API for getting list of local addresses. Does not work for 32-bit
4548 * programs running on a 64-bit kernel
4550 static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
4551 char __user *optval, int __user *optlen)
4553 struct sctp_bind_addr *bp;
4554 struct sctp_association *asoc;
4556 struct sctp_getaddrs_old getaddrs;
4557 struct sctp_sockaddr_entry *addr;
4559 union sctp_addr temp;
4560 struct sctp_sock *sp = sctp_sk(sk);
4565 int bytes_copied = 0;
4567 if (len < sizeof(struct sctp_getaddrs_old))
4570 len = sizeof(struct sctp_getaddrs_old);
4571 if (copy_from_user(&getaddrs, optval, len))
4574 if (getaddrs.addr_num <= 0 ||
4575 getaddrs.addr_num >= (INT_MAX / sizeof(union sctp_addr)))
4578 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_OLD "
4579 "socket option deprecated\n");
4582 * For UDP-style sockets, id specifies the association to query.
4583 * If the id field is set to the value '0' then the locally bound
4584 * addresses are returned without regard to any particular
4587 if (0 == getaddrs.assoc_id) {
4588 bp = &sctp_sk(sk)->ep->base.bind_addr;
4590 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4593 bp = &asoc->base.bind_addr;
4596 to = getaddrs.addrs;
4598 /* Allocate space for a local instance of packed array to hold all
4599 * the data. We store addresses here first and then put write them
4600 * to the user in one shot.
4602 addrs = kmalloc(sizeof(union sctp_addr) * getaddrs.addr_num,
4607 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4608 * addresses from the global local address list.
4610 if (sctp_list_single_entry(&bp->address_list)) {
4611 addr = list_entry(bp->address_list.next,
4612 struct sctp_sockaddr_entry, list);
4613 if (sctp_is_any(sk, &addr->a)) {
4614 cnt = sctp_copy_laddrs_old(sk, bp->port,
4616 addrs, &bytes_copied);
4622 /* Protection on the bound address list is not needed since
4623 * in the socket option context we hold a socket lock and
4624 * thus the bound address list can't change.
4626 list_for_each_entry(addr, &bp->address_list, list) {
4627 memcpy(&temp, &addr->a, sizeof(temp));
4628 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4629 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4630 memcpy(buf, &temp, addrlen);
4632 bytes_copied += addrlen;
4634 if (cnt >= getaddrs.addr_num) break;
4638 /* copy the entire address list into the user provided space */
4639 if (copy_to_user(to, addrs, bytes_copied)) {
4644 /* copy the leading structure back to user */
4645 getaddrs.addr_num = cnt;
4646 if (copy_to_user(optval, &getaddrs, len))
4654 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4655 char __user *optval, int __user *optlen)
4657 struct sctp_bind_addr *bp;
4658 struct sctp_association *asoc;
4660 struct sctp_getaddrs getaddrs;
4661 struct sctp_sockaddr_entry *addr;
4663 union sctp_addr temp;
4664 struct sctp_sock *sp = sctp_sk(sk);
4668 int bytes_copied = 0;
4672 if (len < sizeof(struct sctp_getaddrs))
4675 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4679 * For UDP-style sockets, id specifies the association to query.
4680 * If the id field is set to the value '0' then the locally bound
4681 * addresses are returned without regard to any particular
4684 if (0 == getaddrs.assoc_id) {
4685 bp = &sctp_sk(sk)->ep->base.bind_addr;
4687 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4690 bp = &asoc->base.bind_addr;
4693 to = optval + offsetof(struct sctp_getaddrs,addrs);
4694 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4696 addrs = kmalloc(space_left, GFP_KERNEL);
4700 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4701 * addresses from the global local address list.
4703 if (sctp_list_single_entry(&bp->address_list)) {
4704 addr = list_entry(bp->address_list.next,
4705 struct sctp_sockaddr_entry, list);
4706 if (sctp_is_any(sk, &addr->a)) {
4707 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4708 space_left, &bytes_copied);
4718 /* Protection on the bound address list is not needed since
4719 * in the socket option context we hold a socket lock and
4720 * thus the bound address list can't change.
4722 list_for_each_entry(addr, &bp->address_list, list) {
4723 memcpy(&temp, &addr->a, sizeof(temp));
4724 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4725 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4726 if (space_left < addrlen) {
4727 err = -ENOMEM; /*fixme: right error?*/
4730 memcpy(buf, &temp, addrlen);
4732 bytes_copied += addrlen;
4734 space_left -= addrlen;
4738 if (copy_to_user(to, addrs, bytes_copied)) {
4742 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4746 if (put_user(bytes_copied, optlen))
4753 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4755 * Requests that the local SCTP stack use the enclosed peer address as
4756 * the association primary. The enclosed address must be one of the
4757 * association peer's addresses.
4759 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4760 char __user *optval, int __user *optlen)
4762 struct sctp_prim prim;
4763 struct sctp_association *asoc;
4764 struct sctp_sock *sp = sctp_sk(sk);
4766 if (len < sizeof(struct sctp_prim))
4769 len = sizeof(struct sctp_prim);
4771 if (copy_from_user(&prim, optval, len))
4774 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4778 if (!asoc->peer.primary_path)
4781 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4782 asoc->peer.primary_path->af_specific->sockaddr_len);
4784 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4785 (union sctp_addr *)&prim.ssp_addr);
4787 if (put_user(len, optlen))
4789 if (copy_to_user(optval, &prim, len))
4796 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4798 * Requests that the local endpoint set the specified Adaptation Layer
4799 * Indication parameter for all future INIT and INIT-ACK exchanges.
4801 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4802 char __user *optval, int __user *optlen)
4804 struct sctp_setadaptation adaptation;
4806 if (len < sizeof(struct sctp_setadaptation))
4809 len = sizeof(struct sctp_setadaptation);
4811 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4813 if (put_user(len, optlen))
4815 if (copy_to_user(optval, &adaptation, len))
4823 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4825 * Applications that wish to use the sendto() system call may wish to
4826 * specify a default set of parameters that would normally be supplied
4827 * through the inclusion of ancillary data. This socket option allows
4828 * such an application to set the default sctp_sndrcvinfo structure.
4831 * The application that wishes to use this socket option simply passes
4832 * in to this call the sctp_sndrcvinfo structure defined in Section
4833 * 5.2.2) The input parameters accepted by this call include
4834 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4835 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4836 * to this call if the caller is using the UDP model.
4838 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4840 static int sctp_getsockopt_default_send_param(struct sock *sk,
4841 int len, char __user *optval,
4844 struct sctp_sndrcvinfo info;
4845 struct sctp_association *asoc;
4846 struct sctp_sock *sp = sctp_sk(sk);
4848 if (len < sizeof(struct sctp_sndrcvinfo))
4851 len = sizeof(struct sctp_sndrcvinfo);
4853 if (copy_from_user(&info, optval, len))
4856 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4857 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4861 info.sinfo_stream = asoc->default_stream;
4862 info.sinfo_flags = asoc->default_flags;
4863 info.sinfo_ppid = asoc->default_ppid;
4864 info.sinfo_context = asoc->default_context;
4865 info.sinfo_timetolive = asoc->default_timetolive;
4867 info.sinfo_stream = sp->default_stream;
4868 info.sinfo_flags = sp->default_flags;
4869 info.sinfo_ppid = sp->default_ppid;
4870 info.sinfo_context = sp->default_context;
4871 info.sinfo_timetolive = sp->default_timetolive;
4874 if (put_user(len, optlen))
4876 if (copy_to_user(optval, &info, len))
4884 * 7.1.5 SCTP_NODELAY
4886 * Turn on/off any Nagle-like algorithm. This means that packets are
4887 * generally sent as soon as possible and no unnecessary delays are
4888 * introduced, at the cost of more packets in the network. Expects an
4889 * integer boolean flag.
4892 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4893 char __user *optval, int __user *optlen)
4897 if (len < sizeof(int))
4901 val = (sctp_sk(sk)->nodelay == 1);
4902 if (put_user(len, optlen))
4904 if (copy_to_user(optval, &val, len))
4911 * 7.1.1 SCTP_RTOINFO
4913 * The protocol parameters used to initialize and bound retransmission
4914 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4915 * and modify these parameters.
4916 * All parameters are time values, in milliseconds. A value of 0, when
4917 * modifying the parameters, indicates that the current value should not
4921 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4922 char __user *optval,
4923 int __user *optlen) {
4924 struct sctp_rtoinfo rtoinfo;
4925 struct sctp_association *asoc;
4927 if (len < sizeof (struct sctp_rtoinfo))
4930 len = sizeof(struct sctp_rtoinfo);
4932 if (copy_from_user(&rtoinfo, optval, len))
4935 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4937 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4940 /* Values corresponding to the specific association. */
4942 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4943 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4944 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4946 /* Values corresponding to the endpoint. */
4947 struct sctp_sock *sp = sctp_sk(sk);
4949 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4950 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4951 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4954 if (put_user(len, optlen))
4957 if (copy_to_user(optval, &rtoinfo, len))
4965 * 7.1.2 SCTP_ASSOCINFO
4967 * This option is used to tune the maximum retransmission attempts
4968 * of the association.
4969 * Returns an error if the new association retransmission value is
4970 * greater than the sum of the retransmission value of the peer.
4971 * See [SCTP] for more information.
4974 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4975 char __user *optval,
4979 struct sctp_assocparams assocparams;
4980 struct sctp_association *asoc;
4981 struct list_head *pos;
4984 if (len < sizeof (struct sctp_assocparams))
4987 len = sizeof(struct sctp_assocparams);
4989 if (copy_from_user(&assocparams, optval, len))
4992 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4994 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4997 /* Values correspoinding to the specific association */
4999 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5000 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5001 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5002 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5004 (asoc->cookie_life.tv_usec
5007 list_for_each(pos, &asoc->peer.transport_addr_list) {
5011 assocparams.sasoc_number_peer_destinations = cnt;
5013 /* Values corresponding to the endpoint */
5014 struct sctp_sock *sp = sctp_sk(sk);
5016 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5017 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5018 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5019 assocparams.sasoc_cookie_life =
5020 sp->assocparams.sasoc_cookie_life;
5021 assocparams.sasoc_number_peer_destinations =
5023 sasoc_number_peer_destinations;
5026 if (put_user(len, optlen))
5029 if (copy_to_user(optval, &assocparams, len))
5036 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5038 * This socket option is a boolean flag which turns on or off mapped V4
5039 * addresses. If this option is turned on and the socket is type
5040 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5041 * If this option is turned off, then no mapping will be done of V4
5042 * addresses and a user will receive both PF_INET6 and PF_INET type
5043 * addresses on the socket.
5045 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5046 char __user *optval, int __user *optlen)
5049 struct sctp_sock *sp = sctp_sk(sk);
5051 if (len < sizeof(int))
5056 if (put_user(len, optlen))
5058 if (copy_to_user(optval, &val, len))
5065 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5066 * (chapter and verse is quoted at sctp_setsockopt_context())
5068 static int sctp_getsockopt_context(struct sock *sk, int len,
5069 char __user *optval, int __user *optlen)
5071 struct sctp_assoc_value params;
5072 struct sctp_sock *sp;
5073 struct sctp_association *asoc;
5075 if (len < sizeof(struct sctp_assoc_value))
5078 len = sizeof(struct sctp_assoc_value);
5080 if (copy_from_user(¶ms, optval, len))
5085 if (params.assoc_id != 0) {
5086 asoc = sctp_id2assoc(sk, params.assoc_id);
5089 params.assoc_value = asoc->default_rcv_context;
5091 params.assoc_value = sp->default_rcv_context;
5094 if (put_user(len, optlen))
5096 if (copy_to_user(optval, ¶ms, len))
5103 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
5105 * This socket option specifies the maximum size to put in any outgoing
5106 * SCTP chunk. If a message is larger than this size it will be
5107 * fragmented by SCTP into the specified size. Note that the underlying
5108 * SCTP implementation may fragment into smaller sized chunks when the
5109 * PMTU of the underlying association is smaller than the value set by
5112 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5113 char __user *optval, int __user *optlen)
5117 if (len < sizeof(int))
5122 val = sctp_sk(sk)->user_frag;
5123 if (put_user(len, optlen))
5125 if (copy_to_user(optval, &val, len))
5132 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5133 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5135 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5136 char __user *optval, int __user *optlen)
5140 if (len < sizeof(int))
5145 val = sctp_sk(sk)->frag_interleave;
5146 if (put_user(len, optlen))
5148 if (copy_to_user(optval, &val, len))
5155 * 7.1.25. Set or Get the sctp partial delivery point
5156 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5158 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5159 char __user *optval,
5164 if (len < sizeof(u32))
5169 val = sctp_sk(sk)->pd_point;
5170 if (put_user(len, optlen))
5172 if (copy_to_user(optval, &val, len))
5179 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5180 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5182 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5183 char __user *optval,
5186 struct sctp_assoc_value params;
5187 struct sctp_sock *sp;
5188 struct sctp_association *asoc;
5190 if (len < sizeof(int))
5193 if (len == sizeof(int)) {
5195 "SCTP: Use of int in max_burst socket option deprecated\n");
5197 "SCTP: Use struct sctp_assoc_value instead\n");
5198 params.assoc_id = 0;
5199 } else if (len == sizeof (struct sctp_assoc_value)) {
5200 if (copy_from_user(¶ms, optval, len))
5207 if (params.assoc_id != 0) {
5208 asoc = sctp_id2assoc(sk, params.assoc_id);
5211 params.assoc_value = asoc->max_burst;
5213 params.assoc_value = sp->max_burst;
5215 if (len == sizeof(int)) {
5216 if (copy_to_user(optval, ¶ms.assoc_value, len))
5219 if (copy_to_user(optval, ¶ms, len))
5227 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5228 char __user *optval, int __user *optlen)
5230 struct sctp_hmacalgo __user *p = (void __user *)optval;
5231 struct sctp_hmac_algo_param *hmacs;
5235 if (!sctp_auth_enable)
5238 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5239 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5241 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5244 len = sizeof(struct sctp_hmacalgo) + data_len;
5245 num_idents = data_len / sizeof(u16);
5247 if (put_user(len, optlen))
5249 if (put_user(num_idents, &p->shmac_num_idents))
5251 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5256 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5257 char __user *optval, int __user *optlen)
5259 struct sctp_authkeyid val;
5260 struct sctp_association *asoc;
5262 if (!sctp_auth_enable)
5265 if (len < sizeof(struct sctp_authkeyid))
5267 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5270 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5271 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5275 val.scact_keynumber = asoc->active_key_id;
5277 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5279 len = sizeof(struct sctp_authkeyid);
5280 if (put_user(len, optlen))
5282 if (copy_to_user(optval, &val, len))
5288 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5289 char __user *optval, int __user *optlen)
5291 struct sctp_authchunks __user *p = (void __user *)optval;
5292 struct sctp_authchunks val;
5293 struct sctp_association *asoc;
5294 struct sctp_chunks_param *ch;
5298 if (!sctp_auth_enable)
5301 if (len < sizeof(struct sctp_authchunks))
5304 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5307 to = p->gauth_chunks;
5308 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5312 ch = asoc->peer.peer_chunks;
5316 /* See if the user provided enough room for all the data */
5317 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5318 if (len < num_chunks)
5321 if (copy_to_user(to, ch->chunks, num_chunks))
5324 len = sizeof(struct sctp_authchunks) + num_chunks;
5325 if (put_user(len, optlen)) return -EFAULT;
5326 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5331 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5332 char __user *optval, int __user *optlen)
5334 struct sctp_authchunks __user *p = (void __user *)optval;
5335 struct sctp_authchunks val;
5336 struct sctp_association *asoc;
5337 struct sctp_chunks_param *ch;
5341 if (!sctp_auth_enable)
5344 if (len < sizeof(struct sctp_authchunks))
5347 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5350 to = p->gauth_chunks;
5351 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5352 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5356 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5358 ch = sctp_sk(sk)->ep->auth_chunk_list;
5363 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5364 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5367 if (copy_to_user(to, ch->chunks, num_chunks))
5370 len = sizeof(struct sctp_authchunks) + num_chunks;
5371 if (put_user(len, optlen))
5373 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5379 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5380 char __user *optval, int __user *optlen)
5385 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5388 /* I can hardly begin to describe how wrong this is. This is
5389 * so broken as to be worse than useless. The API draft
5390 * REALLY is NOT helpful here... I am not convinced that the
5391 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5392 * are at all well-founded.
5394 if (level != SOL_SCTP) {
5395 struct sctp_af *af = sctp_sk(sk)->pf->af;
5397 retval = af->getsockopt(sk, level, optname, optval, optlen);
5401 if (get_user(len, optlen))
5408 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5410 case SCTP_DISABLE_FRAGMENTS:
5411 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5415 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5417 case SCTP_AUTOCLOSE:
5418 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5420 case SCTP_SOCKOPT_PEELOFF:
5421 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5423 case SCTP_PEER_ADDR_PARAMS:
5424 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5427 case SCTP_DELAYED_ACK:
5428 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5432 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5434 case SCTP_GET_PEER_ADDRS_NUM_OLD:
5435 retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
5438 case SCTP_GET_LOCAL_ADDRS_NUM_OLD:
5439 retval = sctp_getsockopt_local_addrs_num_old(sk, len, optval,
5442 case SCTP_GET_PEER_ADDRS_OLD:
5443 retval = sctp_getsockopt_peer_addrs_old(sk, len, optval,
5446 case SCTP_GET_LOCAL_ADDRS_OLD:
5447 retval = sctp_getsockopt_local_addrs_old(sk, len, optval,
5450 case SCTP_GET_PEER_ADDRS:
5451 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5454 case SCTP_GET_LOCAL_ADDRS:
5455 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5458 case SCTP_DEFAULT_SEND_PARAM:
5459 retval = sctp_getsockopt_default_send_param(sk, len,
5462 case SCTP_PRIMARY_ADDR:
5463 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5466 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5469 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5471 case SCTP_ASSOCINFO:
5472 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5474 case SCTP_I_WANT_MAPPED_V4_ADDR:
5475 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5478 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5480 case SCTP_GET_PEER_ADDR_INFO:
5481 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5484 case SCTP_ADAPTATION_LAYER:
5485 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5489 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5491 case SCTP_FRAGMENT_INTERLEAVE:
5492 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5495 case SCTP_PARTIAL_DELIVERY_POINT:
5496 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5499 case SCTP_MAX_BURST:
5500 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5503 case SCTP_AUTH_CHUNK:
5504 case SCTP_AUTH_DELETE_KEY:
5505 retval = -EOPNOTSUPP;
5507 case SCTP_HMAC_IDENT:
5508 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5510 case SCTP_AUTH_ACTIVE_KEY:
5511 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5513 case SCTP_PEER_AUTH_CHUNKS:
5514 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5517 case SCTP_LOCAL_AUTH_CHUNKS:
5518 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5522 retval = -ENOPROTOOPT;
5526 sctp_release_sock(sk);
5530 static void sctp_hash(struct sock *sk)
5535 static void sctp_unhash(struct sock *sk)
5540 /* Check if port is acceptable. Possibly find first available port.
5542 * The port hash table (contained in the 'global' SCTP protocol storage
5543 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5544 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5545 * list (the list number is the port number hashed out, so as you
5546 * would expect from a hash function, all the ports in a given list have
5547 * such a number that hashes out to the same list number; you were
5548 * expecting that, right?); so each list has a set of ports, with a
5549 * link to the socket (struct sock) that uses it, the port number and
5550 * a fastreuse flag (FIXME: NPI ipg).
5552 static struct sctp_bind_bucket *sctp_bucket_create(
5553 struct sctp_bind_hashbucket *head, unsigned short snum);
5555 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5557 struct sctp_bind_hashbucket *head; /* hash list */
5558 struct sctp_bind_bucket *pp; /* hash list port iterator */
5559 struct hlist_node *node;
5560 unsigned short snum;
5563 snum = ntohs(addr->v4.sin_port);
5565 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5566 sctp_local_bh_disable();
5569 /* Search for an available port. */
5570 int low, high, remaining, index;
5573 inet_get_local_port_range(&low, &high);
5574 remaining = (high - low) + 1;
5575 rover = net_random() % remaining + low;
5579 if ((rover < low) || (rover > high))
5581 index = sctp_phashfn(rover);
5582 head = &sctp_port_hashtable[index];
5583 sctp_spin_lock(&head->lock);
5584 sctp_for_each_hentry(pp, node, &head->chain)
5585 if (pp->port == rover)
5589 sctp_spin_unlock(&head->lock);
5590 } while (--remaining > 0);
5592 /* Exhausted local port range during search? */
5597 /* OK, here is the one we will use. HEAD (the port
5598 * hash table list entry) is non-NULL and we hold it's
5603 /* We are given an specific port number; we verify
5604 * that it is not being used. If it is used, we will
5605 * exahust the search in the hash list corresponding
5606 * to the port number (snum) - we detect that with the
5607 * port iterator, pp being NULL.
5609 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5610 sctp_spin_lock(&head->lock);
5611 sctp_for_each_hentry(pp, node, &head->chain) {
5612 if (pp->port == snum)
5619 if (!hlist_empty(&pp->owner)) {
5620 /* We had a port hash table hit - there is an
5621 * available port (pp != NULL) and it is being
5622 * used by other socket (pp->owner not empty); that other
5623 * socket is going to be sk2.
5625 int reuse = sk->sk_reuse;
5627 struct hlist_node *node;
5629 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5630 if (pp->fastreuse && sk->sk_reuse &&
5631 sk->sk_state != SCTP_SS_LISTENING)
5634 /* Run through the list of sockets bound to the port
5635 * (pp->port) [via the pointers bind_next and
5636 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5637 * we get the endpoint they describe and run through
5638 * the endpoint's list of IP (v4 or v6) addresses,
5639 * comparing each of the addresses with the address of
5640 * the socket sk. If we find a match, then that means
5641 * that this port/socket (sk) combination are already
5644 sk_for_each_bound(sk2, node, &pp->owner) {
5645 struct sctp_endpoint *ep2;
5646 ep2 = sctp_sk(sk2)->ep;
5649 (reuse && sk2->sk_reuse &&
5650 sk2->sk_state != SCTP_SS_LISTENING))
5653 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5654 sctp_sk(sk2), sctp_sk(sk))) {
5659 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5662 /* If there was a hash table miss, create a new port. */
5664 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5667 /* In either case (hit or miss), make sure fastreuse is 1 only
5668 * if sk->sk_reuse is too (that is, if the caller requested
5669 * SO_REUSEADDR on this socket -sk-).
5671 if (hlist_empty(&pp->owner)) {
5672 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5676 } else if (pp->fastreuse &&
5677 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5680 /* We are set, so fill up all the data in the hash table
5681 * entry, tie the socket list information with the rest of the
5682 * sockets FIXME: Blurry, NPI (ipg).
5685 if (!sctp_sk(sk)->bind_hash) {
5686 inet_sk(sk)->num = snum;
5687 sk_add_bind_node(sk, &pp->owner);
5688 sctp_sk(sk)->bind_hash = pp;
5693 sctp_spin_unlock(&head->lock);
5696 sctp_local_bh_enable();
5700 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5701 * port is requested.
5703 static int sctp_get_port(struct sock *sk, unsigned short snum)
5706 union sctp_addr addr;
5707 struct sctp_af *af = sctp_sk(sk)->pf->af;
5709 /* Set up a dummy address struct from the sk. */
5710 af->from_sk(&addr, sk);
5711 addr.v4.sin_port = htons(snum);
5713 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5714 ret = sctp_get_port_local(sk, &addr);
5716 return (ret ? 1 : 0);
5720 * 3.1.3 listen() - UDP Style Syntax
5722 * By default, new associations are not accepted for UDP style sockets.
5723 * An application uses listen() to mark a socket as being able to
5724 * accept new associations.
5726 SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
5728 struct sctp_sock *sp = sctp_sk(sk);
5729 struct sctp_endpoint *ep = sp->ep;
5731 /* Only UDP style sockets that are not peeled off are allowed to
5734 if (!sctp_style(sk, UDP))
5737 /* If backlog is zero, disable listening. */
5739 if (sctp_sstate(sk, CLOSED))
5742 sctp_unhash_endpoint(ep);
5743 sk->sk_state = SCTP_SS_CLOSED;
5747 /* Return if we are already listening. */
5748 if (sctp_sstate(sk, LISTENING))
5752 * If a bind() or sctp_bindx() is not called prior to a listen()
5753 * call that allows new associations to be accepted, the system
5754 * picks an ephemeral port and will choose an address set equivalent
5755 * to binding with a wildcard address.
5757 * This is not currently spelled out in the SCTP sockets
5758 * extensions draft, but follows the practice as seen in TCP
5761 * Additionally, turn off fastreuse flag since we are not listening
5763 sk->sk_state = SCTP_SS_LISTENING;
5764 if (!ep->base.bind_addr.port) {
5765 if (sctp_autobind(sk))
5768 if (sctp_get_port(sk, inet_sk(sk)->num)) {
5769 sk->sk_state = SCTP_SS_CLOSED;
5772 sctp_sk(sk)->bind_hash->fastreuse = 0;
5775 sctp_hash_endpoint(ep);
5780 * 4.1.3 listen() - TCP Style Syntax
5782 * Applications uses listen() to ready the SCTP endpoint for accepting
5783 * inbound associations.
5785 SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
5787 struct sctp_sock *sp = sctp_sk(sk);
5788 struct sctp_endpoint *ep = sp->ep;
5790 /* If backlog is zero, disable listening. */
5792 if (sctp_sstate(sk, CLOSED))
5795 sctp_unhash_endpoint(ep);
5796 sk->sk_state = SCTP_SS_CLOSED;
5800 if (sctp_sstate(sk, LISTENING))
5804 * If a bind() or sctp_bindx() is not called prior to a listen()
5805 * call that allows new associations to be accepted, the system
5806 * picks an ephemeral port and will choose an address set equivalent
5807 * to binding with a wildcard address.
5809 * This is not currently spelled out in the SCTP sockets
5810 * extensions draft, but follows the practice as seen in TCP
5813 sk->sk_state = SCTP_SS_LISTENING;
5814 if (!ep->base.bind_addr.port) {
5815 if (sctp_autobind(sk))
5818 sctp_sk(sk)->bind_hash->fastreuse = 0;
5820 sk->sk_max_ack_backlog = backlog;
5821 sctp_hash_endpoint(ep);
5826 * Move a socket to LISTENING state.
5828 int sctp_inet_listen(struct socket *sock, int backlog)
5830 struct sock *sk = sock->sk;
5831 struct crypto_hash *tfm = NULL;
5834 if (unlikely(backlog < 0))
5839 if (sock->state != SS_UNCONNECTED)
5842 /* Allocate HMAC for generating cookie. */
5843 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5844 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5846 if (net_ratelimit()) {
5848 "SCTP: failed to load transform for %s: %ld\n",
5849 sctp_hmac_alg, PTR_ERR(tfm));
5856 switch (sock->type) {
5857 case SOCK_SEQPACKET:
5858 err = sctp_seqpacket_listen(sk, backlog);
5861 err = sctp_stream_listen(sk, backlog);
5870 /* Store away the transform reference. */
5871 if (!sctp_sk(sk)->hmac)
5872 sctp_sk(sk)->hmac = tfm;
5874 sctp_release_sock(sk);
5877 crypto_free_hash(tfm);
5882 * This function is done by modeling the current datagram_poll() and the
5883 * tcp_poll(). Note that, based on these implementations, we don't
5884 * lock the socket in this function, even though it seems that,
5885 * ideally, locking or some other mechanisms can be used to ensure
5886 * the integrity of the counters (sndbuf and wmem_alloc) used
5887 * in this place. We assume that we don't need locks either until proven
5890 * Another thing to note is that we include the Async I/O support
5891 * here, again, by modeling the current TCP/UDP code. We don't have
5892 * a good way to test with it yet.
5894 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5896 struct sock *sk = sock->sk;
5897 struct sctp_sock *sp = sctp_sk(sk);
5900 poll_wait(file, sk->sk_sleep, wait);
5902 /* A TCP-style listening socket becomes readable when the accept queue
5905 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5906 return (!list_empty(&sp->ep->asocs)) ?
5907 (POLLIN | POLLRDNORM) : 0;
5911 /* Is there any exceptional events? */
5912 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5914 if (sk->sk_shutdown & RCV_SHUTDOWN)
5916 if (sk->sk_shutdown == SHUTDOWN_MASK)
5919 /* Is it readable? Reconsider this code with TCP-style support. */
5920 if (!skb_queue_empty(&sk->sk_receive_queue) ||
5921 (sk->sk_shutdown & RCV_SHUTDOWN))
5922 mask |= POLLIN | POLLRDNORM;
5924 /* The association is either gone or not ready. */
5925 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5928 /* Is it writable? */
5929 if (sctp_writeable(sk)) {
5930 mask |= POLLOUT | POLLWRNORM;
5932 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5934 * Since the socket is not locked, the buffer
5935 * might be made available after the writeable check and
5936 * before the bit is set. This could cause a lost I/O
5937 * signal. tcp_poll() has a race breaker for this race
5938 * condition. Based on their implementation, we put
5939 * in the following code to cover it as well.
5941 if (sctp_writeable(sk))
5942 mask |= POLLOUT | POLLWRNORM;
5947 /********************************************************************
5948 * 2nd Level Abstractions
5949 ********************************************************************/
5951 static struct sctp_bind_bucket *sctp_bucket_create(
5952 struct sctp_bind_hashbucket *head, unsigned short snum)
5954 struct sctp_bind_bucket *pp;
5956 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
5958 SCTP_DBG_OBJCNT_INC(bind_bucket);
5961 INIT_HLIST_HEAD(&pp->owner);
5962 hlist_add_head(&pp->node, &head->chain);
5967 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5968 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5970 if (pp && hlist_empty(&pp->owner)) {
5971 __hlist_del(&pp->node);
5972 kmem_cache_free(sctp_bucket_cachep, pp);
5973 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5977 /* Release this socket's reference to a local port. */
5978 static inline void __sctp_put_port(struct sock *sk)
5980 struct sctp_bind_hashbucket *head =
5981 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->num)];
5982 struct sctp_bind_bucket *pp;
5984 sctp_spin_lock(&head->lock);
5985 pp = sctp_sk(sk)->bind_hash;
5986 __sk_del_bind_node(sk);
5987 sctp_sk(sk)->bind_hash = NULL;
5988 inet_sk(sk)->num = 0;
5989 sctp_bucket_destroy(pp);
5990 sctp_spin_unlock(&head->lock);
5993 void sctp_put_port(struct sock *sk)
5995 sctp_local_bh_disable();
5996 __sctp_put_port(sk);
5997 sctp_local_bh_enable();
6001 * The system picks an ephemeral port and choose an address set equivalent
6002 * to binding with a wildcard address.
6003 * One of those addresses will be the primary address for the association.
6004 * This automatically enables the multihoming capability of SCTP.
6006 static int sctp_autobind(struct sock *sk)
6008 union sctp_addr autoaddr;
6012 /* Initialize a local sockaddr structure to INADDR_ANY. */
6013 af = sctp_sk(sk)->pf->af;
6015 port = htons(inet_sk(sk)->num);
6016 af->inaddr_any(&autoaddr, port);
6018 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6021 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6024 * 4.2 The cmsghdr Structure *
6026 * When ancillary data is sent or received, any number of ancillary data
6027 * objects can be specified by the msg_control and msg_controllen members of
6028 * the msghdr structure, because each object is preceded by
6029 * a cmsghdr structure defining the object's length (the cmsg_len member).
6030 * Historically Berkeley-derived implementations have passed only one object
6031 * at a time, but this API allows multiple objects to be
6032 * passed in a single call to sendmsg() or recvmsg(). The following example
6033 * shows two ancillary data objects in a control buffer.
6035 * |<--------------------------- msg_controllen -------------------------->|
6038 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6040 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6043 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6045 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6048 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6049 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6051 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6053 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6060 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6061 sctp_cmsgs_t *cmsgs)
6063 struct cmsghdr *cmsg;
6064 struct msghdr *my_msg = (struct msghdr *)msg;
6066 for (cmsg = CMSG_FIRSTHDR(msg);
6068 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6069 if (!CMSG_OK(my_msg, cmsg))
6072 /* Should we parse this header or ignore? */
6073 if (cmsg->cmsg_level != IPPROTO_SCTP)
6076 /* Strictly check lengths following example in SCM code. */
6077 switch (cmsg->cmsg_type) {
6079 /* SCTP Socket API Extension
6080 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6082 * This cmsghdr structure provides information for
6083 * initializing new SCTP associations with sendmsg().
6084 * The SCTP_INITMSG socket option uses this same data
6085 * structure. This structure is not used for
6088 * cmsg_level cmsg_type cmsg_data[]
6089 * ------------ ------------ ----------------------
6090 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6092 if (cmsg->cmsg_len !=
6093 CMSG_LEN(sizeof(struct sctp_initmsg)))
6095 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6099 /* SCTP Socket API Extension
6100 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6102 * This cmsghdr structure specifies SCTP options for
6103 * sendmsg() and describes SCTP header information
6104 * about a received message through recvmsg().
6106 * cmsg_level cmsg_type cmsg_data[]
6107 * ------------ ------------ ----------------------
6108 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6110 if (cmsg->cmsg_len !=
6111 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6115 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6117 /* Minimally, validate the sinfo_flags. */
6118 if (cmsgs->info->sinfo_flags &
6119 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6120 SCTP_ABORT | SCTP_EOF))
6132 * Wait for a packet..
6133 * Note: This function is the same function as in core/datagram.c
6134 * with a few modifications to make lksctp work.
6136 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6141 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6143 /* Socket errors? */
6144 error = sock_error(sk);
6148 if (!skb_queue_empty(&sk->sk_receive_queue))
6151 /* Socket shut down? */
6152 if (sk->sk_shutdown & RCV_SHUTDOWN)
6155 /* Sequenced packets can come disconnected. If so we report the
6160 /* Is there a good reason to think that we may receive some data? */
6161 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6164 /* Handle signals. */
6165 if (signal_pending(current))
6168 /* Let another process have a go. Since we are going to sleep
6169 * anyway. Note: This may cause odd behaviors if the message
6170 * does not fit in the user's buffer, but this seems to be the
6171 * only way to honor MSG_DONTWAIT realistically.
6173 sctp_release_sock(sk);
6174 *timeo_p = schedule_timeout(*timeo_p);
6178 finish_wait(sk->sk_sleep, &wait);
6182 error = sock_intr_errno(*timeo_p);
6185 finish_wait(sk->sk_sleep, &wait);
6190 /* Receive a datagram.
6191 * Note: This is pretty much the same routine as in core/datagram.c
6192 * with a few changes to make lksctp work.
6194 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6195 int noblock, int *err)
6198 struct sk_buff *skb;
6201 timeo = sock_rcvtimeo(sk, noblock);
6203 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6204 timeo, MAX_SCHEDULE_TIMEOUT);
6207 /* Again only user level code calls this function,
6208 * so nothing interrupt level
6209 * will suddenly eat the receive_queue.
6211 * Look at current nfs client by the way...
6212 * However, this function was corrent in any case. 8)
6214 if (flags & MSG_PEEK) {
6215 spin_lock_bh(&sk->sk_receive_queue.lock);
6216 skb = skb_peek(&sk->sk_receive_queue);
6218 atomic_inc(&skb->users);
6219 spin_unlock_bh(&sk->sk_receive_queue.lock);
6221 skb = skb_dequeue(&sk->sk_receive_queue);
6227 /* Caller is allowed not to check sk->sk_err before calling. */
6228 error = sock_error(sk);
6232 if (sk->sk_shutdown & RCV_SHUTDOWN)
6235 /* User doesn't want to wait. */
6239 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6248 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6249 static void __sctp_write_space(struct sctp_association *asoc)
6251 struct sock *sk = asoc->base.sk;
6252 struct socket *sock = sk->sk_socket;
6254 if ((sctp_wspace(asoc) > 0) && sock) {
6255 if (waitqueue_active(&asoc->wait))
6256 wake_up_interruptible(&asoc->wait);
6258 if (sctp_writeable(sk)) {
6259 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6260 wake_up_interruptible(sk->sk_sleep);
6262 /* Note that we try to include the Async I/O support
6263 * here by modeling from the current TCP/UDP code.
6264 * We have not tested with it yet.
6266 if (sock->fasync_list &&
6267 !(sk->sk_shutdown & SEND_SHUTDOWN))
6268 sock_wake_async(sock,
6269 SOCK_WAKE_SPACE, POLL_OUT);
6274 /* Do accounting for the sndbuf space.
6275 * Decrement the used sndbuf space of the corresponding association by the
6276 * data size which was just transmitted(freed).
6278 static void sctp_wfree(struct sk_buff *skb)
6280 struct sctp_association *asoc;
6281 struct sctp_chunk *chunk;
6284 /* Get the saved chunk pointer. */
6285 chunk = *((struct sctp_chunk **)(skb->cb));
6288 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6289 sizeof(struct sk_buff) +
6290 sizeof(struct sctp_chunk);
6292 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6295 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6297 sk->sk_wmem_queued -= skb->truesize;
6298 sk_mem_uncharge(sk, skb->truesize);
6301 __sctp_write_space(asoc);
6303 sctp_association_put(asoc);
6306 /* Do accounting for the receive space on the socket.
6307 * Accounting for the association is done in ulpevent.c
6308 * We set this as a destructor for the cloned data skbs so that
6309 * accounting is done at the correct time.
6311 void sctp_sock_rfree(struct sk_buff *skb)
6313 struct sock *sk = skb->sk;
6314 struct sctp_ulpevent *event = sctp_skb2event(skb);
6316 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6319 * Mimic the behavior of sock_rfree
6321 sk_mem_uncharge(sk, event->rmem_len);
6325 /* Helper function to wait for space in the sndbuf. */
6326 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6329 struct sock *sk = asoc->base.sk;
6331 long current_timeo = *timeo_p;
6334 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6335 asoc, (long)(*timeo_p), msg_len);
6337 /* Increment the association's refcnt. */
6338 sctp_association_hold(asoc);
6340 /* Wait on the association specific sndbuf space. */
6342 prepare_to_wait_exclusive(&asoc->wait, &wait,
6343 TASK_INTERRUPTIBLE);
6346 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6349 if (signal_pending(current))
6350 goto do_interrupted;
6351 if (msg_len <= sctp_wspace(asoc))
6354 /* Let another process have a go. Since we are going
6357 sctp_release_sock(sk);
6358 current_timeo = schedule_timeout(current_timeo);
6359 BUG_ON(sk != asoc->base.sk);
6362 *timeo_p = current_timeo;
6366 finish_wait(&asoc->wait, &wait);
6368 /* Release the association's refcnt. */
6369 sctp_association_put(asoc);
6378 err = sock_intr_errno(*timeo_p);
6386 /* If socket sndbuf has changed, wake up all per association waiters. */
6387 void sctp_write_space(struct sock *sk)
6389 struct sctp_association *asoc;
6391 /* Wake up the tasks in each wait queue. */
6392 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6393 __sctp_write_space(asoc);
6397 /* Is there any sndbuf space available on the socket?
6399 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6400 * associations on the same socket. For a UDP-style socket with
6401 * multiple associations, it is possible for it to be "unwriteable"
6402 * prematurely. I assume that this is acceptable because
6403 * a premature "unwriteable" is better than an accidental "writeable" which
6404 * would cause an unwanted block under certain circumstances. For the 1-1
6405 * UDP-style sockets or TCP-style sockets, this code should work.
6408 static int sctp_writeable(struct sock *sk)
6412 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
6418 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6419 * returns immediately with EINPROGRESS.
6421 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6423 struct sock *sk = asoc->base.sk;
6425 long current_timeo = *timeo_p;
6428 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6431 /* Increment the association's refcnt. */
6432 sctp_association_hold(asoc);
6435 prepare_to_wait_exclusive(&asoc->wait, &wait,
6436 TASK_INTERRUPTIBLE);
6439 if (sk->sk_shutdown & RCV_SHUTDOWN)
6441 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6444 if (signal_pending(current))
6445 goto do_interrupted;
6447 if (sctp_state(asoc, ESTABLISHED))
6450 /* Let another process have a go. Since we are going
6453 sctp_release_sock(sk);
6454 current_timeo = schedule_timeout(current_timeo);
6457 *timeo_p = current_timeo;
6461 finish_wait(&asoc->wait, &wait);
6463 /* Release the association's refcnt. */
6464 sctp_association_put(asoc);
6469 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6472 err = -ECONNREFUSED;
6476 err = sock_intr_errno(*timeo_p);
6484 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6486 struct sctp_endpoint *ep;
6490 ep = sctp_sk(sk)->ep;
6494 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
6495 TASK_INTERRUPTIBLE);
6497 if (list_empty(&ep->asocs)) {
6498 sctp_release_sock(sk);
6499 timeo = schedule_timeout(timeo);
6504 if (!sctp_sstate(sk, LISTENING))
6508 if (!list_empty(&ep->asocs))
6511 err = sock_intr_errno(timeo);
6512 if (signal_pending(current))
6520 finish_wait(sk->sk_sleep, &wait);
6525 static void sctp_wait_for_close(struct sock *sk, long timeout)
6530 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6531 if (list_empty(&sctp_sk(sk)->ep->asocs))
6533 sctp_release_sock(sk);
6534 timeout = schedule_timeout(timeout);
6536 } while (!signal_pending(current) && timeout);
6538 finish_wait(sk->sk_sleep, &wait);
6541 static void sctp_sock_rfree_frag(struct sk_buff *skb)
6543 struct sk_buff *frag;
6548 /* Don't forget the fragments. */
6549 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6550 sctp_sock_rfree_frag(frag);
6553 sctp_sock_rfree(skb);
6556 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6558 struct sk_buff *frag;
6563 /* Don't forget the fragments. */
6564 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6565 sctp_skb_set_owner_r_frag(frag, sk);
6568 sctp_skb_set_owner_r(skb, sk);
6571 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6572 * and its messages to the newsk.
6574 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6575 struct sctp_association *assoc,
6576 sctp_socket_type_t type)
6578 struct sctp_sock *oldsp = sctp_sk(oldsk);
6579 struct sctp_sock *newsp = sctp_sk(newsk);
6580 struct sctp_bind_bucket *pp; /* hash list port iterator */
6581 struct sctp_endpoint *newep = newsp->ep;
6582 struct sk_buff *skb, *tmp;
6583 struct sctp_ulpevent *event;
6584 struct sctp_bind_hashbucket *head;
6586 /* Migrate socket buffer sizes and all the socket level options to the
6589 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6590 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6591 /* Brute force copy old sctp opt. */
6592 inet_sk_copy_descendant(newsk, oldsk);
6594 /* Restore the ep value that was overwritten with the above structure
6600 /* Hook this new socket in to the bind_hash list. */
6601 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->num)];
6602 sctp_local_bh_disable();
6603 sctp_spin_lock(&head->lock);
6604 pp = sctp_sk(oldsk)->bind_hash;
6605 sk_add_bind_node(newsk, &pp->owner);
6606 sctp_sk(newsk)->bind_hash = pp;
6607 inet_sk(newsk)->num = inet_sk(oldsk)->num;
6608 sctp_spin_unlock(&head->lock);
6609 sctp_local_bh_enable();
6611 /* Copy the bind_addr list from the original endpoint to the new
6612 * endpoint so that we can handle restarts properly
6614 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6615 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6617 /* Move any messages in the old socket's receive queue that are for the
6618 * peeled off association to the new socket's receive queue.
6620 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6621 event = sctp_skb2event(skb);
6622 if (event->asoc == assoc) {
6623 sctp_sock_rfree_frag(skb);
6624 __skb_unlink(skb, &oldsk->sk_receive_queue);
6625 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6626 sctp_skb_set_owner_r_frag(skb, newsk);
6630 /* Clean up any messages pending delivery due to partial
6631 * delivery. Three cases:
6632 * 1) No partial deliver; no work.
6633 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6634 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6636 skb_queue_head_init(&newsp->pd_lobby);
6637 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6639 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6640 struct sk_buff_head *queue;
6642 /* Decide which queue to move pd_lobby skbs to. */
6643 if (assoc->ulpq.pd_mode) {
6644 queue = &newsp->pd_lobby;
6646 queue = &newsk->sk_receive_queue;
6648 /* Walk through the pd_lobby, looking for skbs that
6649 * need moved to the new socket.
6651 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6652 event = sctp_skb2event(skb);
6653 if (event->asoc == assoc) {
6654 sctp_sock_rfree_frag(skb);
6655 __skb_unlink(skb, &oldsp->pd_lobby);
6656 __skb_queue_tail(queue, skb);
6657 sctp_skb_set_owner_r_frag(skb, newsk);
6661 /* Clear up any skbs waiting for the partial
6662 * delivery to finish.
6664 if (assoc->ulpq.pd_mode)
6665 sctp_clear_pd(oldsk, NULL);
6669 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp) {
6670 sctp_sock_rfree_frag(skb);
6671 sctp_skb_set_owner_r_frag(skb, newsk);
6674 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp) {
6675 sctp_sock_rfree_frag(skb);
6676 sctp_skb_set_owner_r_frag(skb, newsk);
6679 /* Set the type of socket to indicate that it is peeled off from the
6680 * original UDP-style socket or created with the accept() call on a
6681 * TCP-style socket..
6685 /* Mark the new socket "in-use" by the user so that any packets
6686 * that may arrive on the association after we've moved it are
6687 * queued to the backlog. This prevents a potential race between
6688 * backlog processing on the old socket and new-packet processing
6689 * on the new socket.
6691 * The caller has just allocated newsk so we can guarantee that other
6692 * paths won't try to lock it and then oldsk.
6694 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6695 sctp_assoc_migrate(assoc, newsk);
6697 /* If the association on the newsk is already closed before accept()
6698 * is called, set RCV_SHUTDOWN flag.
6700 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6701 newsk->sk_shutdown |= RCV_SHUTDOWN;
6703 newsk->sk_state = SCTP_SS_ESTABLISHED;
6704 sctp_release_sock(newsk);
6708 /* This proto struct describes the ULP interface for SCTP. */
6709 struct proto sctp_prot = {
6711 .owner = THIS_MODULE,
6712 .close = sctp_close,
6713 .connect = sctp_connect,
6714 .disconnect = sctp_disconnect,
6715 .accept = sctp_accept,
6716 .ioctl = sctp_ioctl,
6717 .init = sctp_init_sock,
6718 .destroy = sctp_destroy_sock,
6719 .shutdown = sctp_shutdown,
6720 .setsockopt = sctp_setsockopt,
6721 .getsockopt = sctp_getsockopt,
6722 .sendmsg = sctp_sendmsg,
6723 .recvmsg = sctp_recvmsg,
6725 .backlog_rcv = sctp_backlog_rcv,
6727 .unhash = sctp_unhash,
6728 .get_port = sctp_get_port,
6729 .obj_size = sizeof(struct sctp_sock),
6730 .sysctl_mem = sysctl_sctp_mem,
6731 .sysctl_rmem = sysctl_sctp_rmem,
6732 .sysctl_wmem = sysctl_sctp_wmem,
6733 .memory_pressure = &sctp_memory_pressure,
6734 .enter_memory_pressure = sctp_enter_memory_pressure,
6735 .memory_allocated = &sctp_memory_allocated,
6736 .sockets_allocated = &sctp_sockets_allocated,
6739 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6741 struct proto sctpv6_prot = {
6743 .owner = THIS_MODULE,
6744 .close = sctp_close,
6745 .connect = sctp_connect,
6746 .disconnect = sctp_disconnect,
6747 .accept = sctp_accept,
6748 .ioctl = sctp_ioctl,
6749 .init = sctp_init_sock,
6750 .destroy = sctp_destroy_sock,
6751 .shutdown = sctp_shutdown,
6752 .setsockopt = sctp_setsockopt,
6753 .getsockopt = sctp_getsockopt,
6754 .sendmsg = sctp_sendmsg,
6755 .recvmsg = sctp_recvmsg,
6757 .backlog_rcv = sctp_backlog_rcv,
6759 .unhash = sctp_unhash,
6760 .get_port = sctp_get_port,
6761 .obj_size = sizeof(struct sctp6_sock),
6762 .sysctl_mem = sysctl_sctp_mem,
6763 .sysctl_rmem = sysctl_sctp_rmem,
6764 .sysctl_wmem = sysctl_sctp_wmem,
6765 .memory_pressure = &sctp_memory_pressure,
6766 .enter_memory_pressure = sctp_enter_memory_pressure,
6767 .memory_allocated = &sctp_memory_allocated,
6768 .sockets_allocated = &sctp_sockets_allocated,
6770 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */