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
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock *sk);
89 static void sctp_wfree(struct sk_buff *skb);
90 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
92 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
93 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
94 static int sctp_wait_for_accept(struct sock *sk, long timeo);
95 static void sctp_wait_for_close(struct sock *sk, long timeo);
96 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
97 union sctp_addr *addr, int len);
98 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
99 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
102 static int sctp_send_asconf(struct sctp_association *asoc,
103 struct sctp_chunk *chunk);
104 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
105 static int sctp_autobind(struct sock *sk);
106 static void sctp_sock_migrate(struct sock *, struct sock *,
107 struct sctp_association *, sctp_socket_type_t);
108 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
110 extern struct kmem_cache *sctp_bucket_cachep;
111 extern int sysctl_sctp_mem[3];
112 extern int sysctl_sctp_rmem[3];
113 extern int sysctl_sctp_wmem[3];
115 static int sctp_memory_pressure;
116 static atomic_t sctp_memory_allocated;
117 struct percpu_counter sctp_sockets_allocated;
119 static void sctp_enter_memory_pressure(struct sock *sk)
121 sctp_memory_pressure = 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association *asoc)
130 if (asoc->ep->sndbuf_policy)
131 amt = asoc->sndbuf_used;
133 amt = sk_wmem_alloc_get(asoc->base.sk);
135 if (amt >= asoc->base.sk->sk_sndbuf) {
136 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
139 amt = sk_stream_wspace(asoc->base.sk);
144 amt = asoc->base.sk->sk_sndbuf - amt;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
158 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
160 struct sctp_association *asoc = chunk->asoc;
161 struct sock *sk = asoc->base.sk;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc);
166 skb_set_owner_w(chunk->skb, sk);
168 chunk->skb->destructor = sctp_wfree;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
172 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
173 sizeof(struct sk_buff) +
174 sizeof(struct sctp_chunk);
176 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
177 sk->sk_wmem_queued += chunk->skb->truesize;
178 sk_mem_charge(sk, chunk->skb->truesize);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
187 /* Verify basic sockaddr. */
188 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
192 /* Is this a valid SCTP address? */
193 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
196 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
207 struct sctp_association *asoc = NULL;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk, UDP)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk, ESTABLISHED))
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk)->ep->asocs))
220 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
221 struct sctp_association, asocs);
225 /* Otherwise this is a UDP-style socket. */
226 if (!id || (id == (sctp_assoc_t)-1))
229 spin_lock_bh(&sctp_assocs_id_lock);
230 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
231 spin_unlock_bh(&sctp_assocs_id_lock);
233 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
243 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
244 struct sockaddr_storage *addr,
247 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
248 struct sctp_transport *transport;
249 union sctp_addr *laddr = (union sctp_addr *)addr;
251 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
258 id_asoc = sctp_id2assoc(sk, id);
259 if (id_asoc && (id_asoc != addr_asoc))
262 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
263 (union sctp_addr *)addr);
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk)->ep->base.bind_addr.port)
289 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
294 sctp_release_sock(sk);
299 static long sctp_get_port_local(struct sock *, union sctp_addr *);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
303 union sctp_addr *addr, int len)
307 /* Check minimum size. */
308 if (len < sizeof (struct sockaddr))
311 /* V4 mapped address are really of AF_INET family */
312 if (addr->sa.sa_family == AF_INET6 &&
313 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
314 if (!opt->pf->af_supported(AF_INET, opt))
317 /* Does this PF support this AF? */
318 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
322 /* If we get this far, af is valid. */
323 af = sctp_get_af_specific(addr->sa.sa_family);
325 if (len < af->sockaddr_len)
331 /* Bind a local address either to an endpoint or to an association. */
332 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
334 struct sctp_sock *sp = sctp_sk(sk);
335 struct sctp_endpoint *ep = sp->ep;
336 struct sctp_bind_addr *bp = &ep->base.bind_addr;
341 /* Common sockaddr verification. */
342 af = sctp_sockaddr_af(sp, addr, len);
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 snum = ntohs(addr->v4.sin_port);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
358 /* PF specific bind() address verification. */
359 if (!sp->pf->bind_verify(sp, addr))
360 return -EADDRNOTAVAIL;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
369 else if (snum != bp->port) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum, bp->port);
377 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
380 /* See if the address matches any of the addresses we may have
381 * already bound before checking against other endpoints.
383 if (sctp_bind_addr_match(bp, addr, sp))
386 /* Make sure we are allowed to bind here.
387 * The function sctp_get_port_local() does duplicate address
390 addr->v4.sin_port = htons(snum);
391 if ((ret = sctp_get_port_local(sk, addr))) {
395 /* Refresh ephemeral port. */
397 bp->port = inet_sk(sk)->inet_num;
399 /* Add the address to the bind address list.
400 * Use GFP_ATOMIC since BHs will be disabled.
402 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
404 /* Copy back into socket for getsockname() use. */
406 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
407 af->to_sk_saddr(addr, sk);
413 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
415 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
416 * at any one time. If a sender, after sending an ASCONF chunk, decides
417 * it needs to transfer another ASCONF Chunk, it MUST wait until the
418 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
419 * subsequent ASCONF. Note this restriction binds each side, so at any
420 * time two ASCONF may be in-transit on any given association (one sent
421 * from each endpoint).
423 static int sctp_send_asconf(struct sctp_association *asoc,
424 struct sctp_chunk *chunk)
428 /* If there is an outstanding ASCONF chunk, queue it for later
431 if (asoc->addip_last_asconf) {
432 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
436 /* Hold the chunk until an ASCONF_ACK is received. */
437 sctp_chunk_hold(chunk);
438 retval = sctp_primitive_ASCONF(asoc, chunk);
440 sctp_chunk_free(chunk);
442 asoc->addip_last_asconf = chunk;
448 /* Add a list of addresses as bind addresses to local endpoint or
451 * Basically run through each address specified in the addrs/addrcnt
452 * array/length pair, determine if it is IPv6 or IPv4 and call
453 * sctp_do_bind() on it.
455 * If any of them fails, then the operation will be reversed and the
456 * ones that were added will be removed.
458 * Only sctp_setsockopt_bindx() is supposed to call this function.
460 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
465 struct sockaddr *sa_addr;
468 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
472 for (cnt = 0; cnt < addrcnt; cnt++) {
473 /* The list may contain either IPv4 or IPv6 address;
474 * determine the address length for walking thru the list.
476 sa_addr = (struct sockaddr *)addr_buf;
477 af = sctp_get_af_specific(sa_addr->sa_family);
483 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
486 addr_buf += af->sockaddr_len;
490 /* Failed. Cleanup the ones that have been added */
492 sctp_bindx_rem(sk, addrs, cnt);
500 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
501 * associations that are part of the endpoint indicating that a list of local
502 * addresses are added to the endpoint.
504 * If any of the addresses is already in the bind address list of the
505 * association, we do not send the chunk for that association. But it will not
506 * affect other associations.
508 * Only sctp_setsockopt_bindx() is supposed to call this function.
510 static int sctp_send_asconf_add_ip(struct sock *sk,
511 struct sockaddr *addrs,
514 struct sctp_sock *sp;
515 struct sctp_endpoint *ep;
516 struct sctp_association *asoc;
517 struct sctp_bind_addr *bp;
518 struct sctp_chunk *chunk;
519 struct sctp_sockaddr_entry *laddr;
520 union sctp_addr *addr;
521 union sctp_addr saveaddr;
528 if (!sctp_addip_enable)
534 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
535 __func__, sk, addrs, addrcnt);
537 list_for_each_entry(asoc, &ep->asocs, asocs) {
539 if (!asoc->peer.asconf_capable)
542 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
545 if (!sctp_state(asoc, ESTABLISHED))
548 /* Check if any address in the packed array of addresses is
549 * in the bind address list of the association. If so,
550 * do not send the asconf chunk to its peer, but continue with
551 * other associations.
554 for (i = 0; i < addrcnt; i++) {
555 addr = (union sctp_addr *)addr_buf;
556 af = sctp_get_af_specific(addr->v4.sin_family);
562 if (sctp_assoc_lookup_laddr(asoc, addr))
565 addr_buf += af->sockaddr_len;
570 /* Use the first valid address in bind addr list of
571 * association as Address Parameter of ASCONF CHUNK.
573 bp = &asoc->base.bind_addr;
574 p = bp->address_list.next;
575 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
576 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
577 addrcnt, SCTP_PARAM_ADD_IP);
583 retval = sctp_send_asconf(asoc, chunk);
587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
591 for (i = 0; i < addrcnt; i++) {
592 addr = (union sctp_addr *)addr_buf;
593 af = sctp_get_af_specific(addr->v4.sin_family);
594 memcpy(&saveaddr, addr, af->sockaddr_len);
595 retval = sctp_add_bind_addr(bp, &saveaddr,
596 SCTP_ADDR_NEW, GFP_ATOMIC);
597 addr_buf += af->sockaddr_len;
605 /* Remove a list of addresses from bind addresses list. Do not remove the
608 * Basically run through each address specified in the addrs/addrcnt
609 * array/length pair, determine if it is IPv6 or IPv4 and call
610 * sctp_del_bind() on it.
612 * If any of them fails, then the operation will be reversed and the
613 * ones that were removed will be added back.
615 * At least one address has to be left; if only one address is
616 * available, the operation will return -EBUSY.
618 * Only sctp_setsockopt_bindx() is supposed to call this function.
620 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
622 struct sctp_sock *sp = sctp_sk(sk);
623 struct sctp_endpoint *ep = sp->ep;
625 struct sctp_bind_addr *bp = &ep->base.bind_addr;
628 union sctp_addr *sa_addr;
631 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
635 for (cnt = 0; cnt < addrcnt; cnt++) {
636 /* If the bind address list is empty or if there is only one
637 * bind address, there is nothing more to be removed (we need
638 * at least one address here).
640 if (list_empty(&bp->address_list) ||
641 (sctp_list_single_entry(&bp->address_list))) {
646 sa_addr = (union sctp_addr *)addr_buf;
647 af = sctp_get_af_specific(sa_addr->sa.sa_family);
653 if (!af->addr_valid(sa_addr, sp, NULL)) {
654 retval = -EADDRNOTAVAIL;
658 if (sa_addr->v4.sin_port != htons(bp->port)) {
663 /* FIXME - There is probably a need to check if sk->sk_saddr and
664 * sk->sk_rcv_addr are currently set to one of the addresses to
665 * be removed. This is something which needs to be looked into
666 * when we are fixing the outstanding issues with multi-homing
667 * socket routing and failover schemes. Refer to comments in
668 * sctp_do_bind(). -daisy
670 retval = sctp_del_bind_addr(bp, sa_addr);
672 addr_buf += af->sockaddr_len;
675 /* Failed. Add the ones that has been removed back */
677 sctp_bindx_add(sk, addrs, cnt);
685 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
686 * the associations that are part of the endpoint indicating that a list of
687 * local addresses are removed from the endpoint.
689 * If any of the addresses is already in the bind address list of the
690 * association, we do not send the chunk for that association. But it will not
691 * affect other associations.
693 * Only sctp_setsockopt_bindx() is supposed to call this function.
695 static int sctp_send_asconf_del_ip(struct sock *sk,
696 struct sockaddr *addrs,
699 struct sctp_sock *sp;
700 struct sctp_endpoint *ep;
701 struct sctp_association *asoc;
702 struct sctp_transport *transport;
703 struct sctp_bind_addr *bp;
704 struct sctp_chunk *chunk;
705 union sctp_addr *laddr;
708 struct sctp_sockaddr_entry *saddr;
712 if (!sctp_addip_enable)
718 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
719 __func__, sk, addrs, addrcnt);
721 list_for_each_entry(asoc, &ep->asocs, asocs) {
723 if (!asoc->peer.asconf_capable)
726 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
729 if (!sctp_state(asoc, ESTABLISHED))
732 /* Check if any address in the packed array of addresses is
733 * not present in the bind address list of the association.
734 * If so, do not send the asconf chunk to its peer, but
735 * continue with other associations.
738 for (i = 0; i < addrcnt; i++) {
739 laddr = (union sctp_addr *)addr_buf;
740 af = sctp_get_af_specific(laddr->v4.sin_family);
746 if (!sctp_assoc_lookup_laddr(asoc, laddr))
749 addr_buf += af->sockaddr_len;
754 /* Find one address in the association's bind address list
755 * that is not in the packed array of addresses. This is to
756 * make sure that we do not delete all the addresses in the
759 bp = &asoc->base.bind_addr;
760 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
765 /* We do not need RCU protection throughout this loop
766 * because this is done under a socket lock from the
769 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
776 /* Reset use_as_src flag for the addresses in the bind address
777 * list that are to be deleted.
780 for (i = 0; i < addrcnt; i++) {
781 laddr = (union sctp_addr *)addr_buf;
782 af = sctp_get_af_specific(laddr->v4.sin_family);
783 list_for_each_entry(saddr, &bp->address_list, list) {
784 if (sctp_cmp_addr_exact(&saddr->a, laddr))
785 saddr->state = SCTP_ADDR_DEL;
787 addr_buf += af->sockaddr_len;
790 /* Update the route and saddr entries for all the transports
791 * as some of the addresses in the bind address list are
792 * about to be deleted and cannot be used as source addresses.
794 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
796 dst_release(transport->dst);
797 sctp_transport_route(transport, NULL,
798 sctp_sk(asoc->base.sk));
801 retval = sctp_send_asconf(asoc, chunk);
807 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
810 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
813 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
814 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
817 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
818 * Section 3.1.2 for this usage.
820 * addrs is a pointer to an array of one or more socket addresses. Each
821 * address is contained in its appropriate structure (i.e. struct
822 * sockaddr_in or struct sockaddr_in6) the family of the address type
823 * must be used to distinguish the address length (note that this
824 * representation is termed a "packed array" of addresses). The caller
825 * specifies the number of addresses in the array with addrcnt.
827 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
828 * -1, and sets errno to the appropriate error code.
830 * For SCTP, the port given in each socket address must be the same, or
831 * sctp_bindx() will fail, setting errno to EINVAL.
833 * The flags parameter is formed from the bitwise OR of zero or more of
834 * the following currently defined flags:
836 * SCTP_BINDX_ADD_ADDR
838 * SCTP_BINDX_REM_ADDR
840 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
841 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
842 * addresses from the association. The two flags are mutually exclusive;
843 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
844 * not remove all addresses from an association; sctp_bindx() will
845 * reject such an attempt with EINVAL.
847 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
848 * additional addresses with an endpoint after calling bind(). Or use
849 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
850 * socket is associated with so that no new association accepted will be
851 * associated with those addresses. If the endpoint supports dynamic
852 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
853 * endpoint to send the appropriate message to the peer to change the
854 * peers address lists.
856 * Adding and removing addresses from a connected association is
857 * optional functionality. Implementations that do not support this
858 * functionality should return EOPNOTSUPP.
860 * Basically do nothing but copying the addresses from user to kernel
861 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
862 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
865 * We don't use copy_from_user() for optimization: we first do the
866 * sanity checks (buffer size -fast- and access check-healthy
867 * pointer); if all of those succeed, then we can alloc the memory
868 * (expensive operation) needed to copy the data to kernel. Then we do
869 * the copying without checking the user space area
870 * (__copy_from_user()).
872 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
875 * sk The sk of the socket
876 * addrs The pointer to the addresses in user land
877 * addrssize Size of the addrs buffer
878 * op Operation to perform (add or remove, see the flags of
881 * Returns 0 if ok, <0 errno code on error.
883 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
884 struct sockaddr __user *addrs,
885 int addrs_size, int op)
887 struct sockaddr *kaddrs;
891 struct sockaddr *sa_addr;
895 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
896 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
898 if (unlikely(addrs_size <= 0))
901 /* Check the user passed a healthy pointer. */
902 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
905 /* Alloc space for the address array in kernel memory. */
906 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
907 if (unlikely(!kaddrs))
910 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
915 /* Walk through the addrs buffer and count the number of addresses. */
917 while (walk_size < addrs_size) {
918 sa_addr = (struct sockaddr *)addr_buf;
919 af = sctp_get_af_specific(sa_addr->sa_family);
921 /* If the address family is not supported or if this address
922 * causes the address buffer to overflow return EINVAL.
924 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
929 addr_buf += af->sockaddr_len;
930 walk_size += af->sockaddr_len;
935 case SCTP_BINDX_ADD_ADDR:
936 err = sctp_bindx_add(sk, kaddrs, addrcnt);
939 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
942 case SCTP_BINDX_REM_ADDR:
943 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
946 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
960 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
962 * Common routine for handling connect() and sctp_connectx().
963 * Connect will come in with just a single address.
965 static int __sctp_connect(struct sock* sk,
966 struct sockaddr *kaddrs,
968 sctp_assoc_t *assoc_id)
970 struct sctp_sock *sp;
971 struct sctp_endpoint *ep;
972 struct sctp_association *asoc = NULL;
973 struct sctp_association *asoc2;
974 struct sctp_transport *transport;
982 union sctp_addr *sa_addr = NULL;
985 unsigned int f_flags = 0;
990 /* connect() cannot be done on a socket that is already in ESTABLISHED
991 * state - UDP-style peeled off socket or a TCP-style socket that
992 * is already connected.
993 * It cannot be done even on a TCP-style listening socket.
995 if (sctp_sstate(sk, ESTABLISHED) ||
996 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1001 /* Walk through the addrs buffer and count the number of addresses. */
1003 while (walk_size < addrs_size) {
1004 sa_addr = (union sctp_addr *)addr_buf;
1005 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1006 port = ntohs(sa_addr->v4.sin_port);
1008 /* If the address family is not supported or if this address
1009 * causes the address buffer to overflow return EINVAL.
1011 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1016 /* Save current address so we can work with it */
1017 memcpy(&to, sa_addr, af->sockaddr_len);
1019 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1023 /* Make sure the destination port is correctly set
1026 if (asoc && asoc->peer.port && asoc->peer.port != port)
1030 /* Check if there already is a matching association on the
1031 * endpoint (other than the one created here).
1033 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1034 if (asoc2 && asoc2 != asoc) {
1035 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1042 /* If we could not find a matching association on the endpoint,
1043 * make sure that there is no peeled-off association matching
1044 * the peer address even on another socket.
1046 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1047 err = -EADDRNOTAVAIL;
1052 /* If a bind() or sctp_bindx() is not called prior to
1053 * an sctp_connectx() call, the system picks an
1054 * ephemeral port and will choose an address set
1055 * equivalent to binding with a wildcard address.
1057 if (!ep->base.bind_addr.port) {
1058 if (sctp_autobind(sk)) {
1064 * If an unprivileged user inherits a 1-many
1065 * style socket with open associations on a
1066 * privileged port, it MAY be permitted to
1067 * accept new associations, but it SHOULD NOT
1068 * be permitted to open new associations.
1070 if (ep->base.bind_addr.port < PROT_SOCK &&
1071 !capable(CAP_NET_BIND_SERVICE)) {
1077 scope = sctp_scope(&to);
1078 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1084 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1092 /* Prime the peer's transport structures. */
1093 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1101 addr_buf += af->sockaddr_len;
1102 walk_size += af->sockaddr_len;
1105 /* In case the user of sctp_connectx() wants an association
1106 * id back, assign one now.
1109 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1114 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1119 /* Initialize sk's dport and daddr for getpeername() */
1120 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1121 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1122 af->to_sk_daddr(sa_addr, sk);
1125 /* in-kernel sockets don't generally have a file allocated to them
1126 * if all they do is call sock_create_kern().
1128 if (sk->sk_socket->file)
1129 f_flags = sk->sk_socket->file->f_flags;
1131 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1133 err = sctp_wait_for_connect(asoc, &timeo);
1134 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1135 *assoc_id = asoc->assoc_id;
1137 /* Don't free association on exit. */
1142 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1143 " kaddrs: %p err: %d\n",
1146 sctp_association_free(asoc);
1150 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1153 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1154 * sctp_assoc_t *asoc);
1156 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1157 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1158 * or IPv6 addresses.
1160 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1161 * Section 3.1.2 for this usage.
1163 * addrs is a pointer to an array of one or more socket addresses. Each
1164 * address is contained in its appropriate structure (i.e. struct
1165 * sockaddr_in or struct sockaddr_in6) the family of the address type
1166 * must be used to distengish the address length (note that this
1167 * representation is termed a "packed array" of addresses). The caller
1168 * specifies the number of addresses in the array with addrcnt.
1170 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1171 * the association id of the new association. On failure, sctp_connectx()
1172 * returns -1, and sets errno to the appropriate error code. The assoc_id
1173 * is not touched by the kernel.
1175 * For SCTP, the port given in each socket address must be the same, or
1176 * sctp_connectx() will fail, setting errno to EINVAL.
1178 * An application can use sctp_connectx to initiate an association with
1179 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1180 * allows a caller to specify multiple addresses at which a peer can be
1181 * reached. The way the SCTP stack uses the list of addresses to set up
1182 * the association is implementation dependant. This function only
1183 * specifies that the stack will try to make use of all the addresses in
1184 * the list when needed.
1186 * Note that the list of addresses passed in is only used for setting up
1187 * the association. It does not necessarily equal the set of addresses
1188 * the peer uses for the resulting association. If the caller wants to
1189 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1190 * retrieve them after the association has been set up.
1192 * Basically do nothing but copying the addresses from user to kernel
1193 * land and invoking either sctp_connectx(). This is used for tunneling
1194 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1196 * We don't use copy_from_user() for optimization: we first do the
1197 * sanity checks (buffer size -fast- and access check-healthy
1198 * pointer); if all of those succeed, then we can alloc the memory
1199 * (expensive operation) needed to copy the data to kernel. Then we do
1200 * the copying without checking the user space area
1201 * (__copy_from_user()).
1203 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1206 * sk The sk of the socket
1207 * addrs The pointer to the addresses in user land
1208 * addrssize Size of the addrs buffer
1210 * Returns >=0 if ok, <0 errno code on error.
1212 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1213 struct sockaddr __user *addrs,
1215 sctp_assoc_t *assoc_id)
1218 struct sockaddr *kaddrs;
1220 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1221 __func__, sk, addrs, addrs_size);
1223 if (unlikely(addrs_size <= 0))
1226 /* Check the user passed a healthy pointer. */
1227 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1230 /* Alloc space for the address array in kernel memory. */
1231 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1232 if (unlikely(!kaddrs))
1235 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1238 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1247 * This is an older interface. It's kept for backward compatibility
1248 * to the option that doesn't provide association id.
1250 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1251 struct sockaddr __user *addrs,
1254 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1258 * New interface for the API. The since the API is done with a socket
1259 * option, to make it simple we feed back the association id is as a return
1260 * indication to the call. Error is always negative and association id is
1263 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1264 struct sockaddr __user *addrs,
1267 sctp_assoc_t assoc_id = 0;
1270 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1279 * New (hopefully final) interface for the API.
1280 * We use the sctp_getaddrs_old structure so that use-space library
1281 * can avoid any unnecessary allocations. The only defferent part
1282 * is that we store the actual length of the address buffer into the
1283 * addrs_num structure member. That way we can re-use the existing
1286 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1287 char __user *optval,
1290 struct sctp_getaddrs_old param;
1291 sctp_assoc_t assoc_id = 0;
1294 if (len < sizeof(param))
1297 if (copy_from_user(¶m, optval, sizeof(param)))
1300 err = __sctp_setsockopt_connectx(sk,
1301 (struct sockaddr __user *)param.addrs,
1302 param.addr_num, &assoc_id);
1304 if (err == 0 || err == -EINPROGRESS) {
1305 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1307 if (put_user(sizeof(assoc_id), optlen))
1314 /* API 3.1.4 close() - UDP Style Syntax
1315 * Applications use close() to perform graceful shutdown (as described in
1316 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1317 * by a UDP-style socket.
1321 * ret = close(int sd);
1323 * sd - the socket descriptor of the associations to be closed.
1325 * To gracefully shutdown a specific association represented by the
1326 * UDP-style socket, an application should use the sendmsg() call,
1327 * passing no user data, but including the appropriate flag in the
1328 * ancillary data (see Section xxxx).
1330 * If sd in the close() call is a branched-off socket representing only
1331 * one association, the shutdown is performed on that association only.
1333 * 4.1.6 close() - TCP Style Syntax
1335 * Applications use close() to gracefully close down an association.
1339 * int close(int sd);
1341 * sd - the socket descriptor of the association to be closed.
1343 * After an application calls close() on a socket descriptor, no further
1344 * socket operations will succeed on that descriptor.
1346 * API 7.1.4 SO_LINGER
1348 * An application using the TCP-style socket can use this option to
1349 * perform the SCTP ABORT primitive. The linger option structure is:
1352 * int l_onoff; // option on/off
1353 * int l_linger; // linger time
1356 * To enable the option, set l_onoff to 1. If the l_linger value is set
1357 * to 0, calling close() is the same as the ABORT primitive. If the
1358 * value is set to a negative value, the setsockopt() call will return
1359 * an error. If the value is set to a positive value linger_time, the
1360 * close() can be blocked for at most linger_time ms. If the graceful
1361 * shutdown phase does not finish during this period, close() will
1362 * return but the graceful shutdown phase continues in the system.
1364 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1366 struct sctp_endpoint *ep;
1367 struct sctp_association *asoc;
1368 struct list_head *pos, *temp;
1370 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1373 sk->sk_shutdown = SHUTDOWN_MASK;
1374 sk->sk_state = SCTP_SS_CLOSING;
1376 ep = sctp_sk(sk)->ep;
1378 /* Walk all associations on an endpoint. */
1379 list_for_each_safe(pos, temp, &ep->asocs) {
1380 asoc = list_entry(pos, struct sctp_association, asocs);
1382 if (sctp_style(sk, TCP)) {
1383 /* A closed association can still be in the list if
1384 * it belongs to a TCP-style listening socket that is
1385 * not yet accepted. If so, free it. If not, send an
1386 * ABORT or SHUTDOWN based on the linger options.
1388 if (sctp_state(asoc, CLOSED)) {
1389 sctp_unhash_established(asoc);
1390 sctp_association_free(asoc);
1395 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1396 struct sctp_chunk *chunk;
1398 chunk = sctp_make_abort_user(asoc, NULL, 0);
1400 sctp_primitive_ABORT(asoc, chunk);
1402 sctp_primitive_SHUTDOWN(asoc, NULL);
1405 /* Clean up any skbs sitting on the receive queue. */
1406 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1407 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1409 /* On a TCP-style socket, block for at most linger_time if set. */
1410 if (sctp_style(sk, TCP) && timeout)
1411 sctp_wait_for_close(sk, timeout);
1413 /* This will run the backlog queue. */
1414 sctp_release_sock(sk);
1416 /* Supposedly, no process has access to the socket, but
1417 * the net layers still may.
1419 sctp_local_bh_disable();
1420 sctp_bh_lock_sock(sk);
1422 /* Hold the sock, since sk_common_release() will put sock_put()
1423 * and we have just a little more cleanup.
1426 sk_common_release(sk);
1428 sctp_bh_unlock_sock(sk);
1429 sctp_local_bh_enable();
1433 SCTP_DBG_OBJCNT_DEC(sock);
1436 /* Handle EPIPE error. */
1437 static int sctp_error(struct sock *sk, int flags, int err)
1440 err = sock_error(sk) ? : -EPIPE;
1441 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1442 send_sig(SIGPIPE, current, 0);
1446 /* API 3.1.3 sendmsg() - UDP Style Syntax
1448 * An application uses sendmsg() and recvmsg() calls to transmit data to
1449 * and receive data from its peer.
1451 * ssize_t sendmsg(int socket, const struct msghdr *message,
1454 * socket - the socket descriptor of the endpoint.
1455 * message - pointer to the msghdr structure which contains a single
1456 * user message and possibly some ancillary data.
1458 * See Section 5 for complete description of the data
1461 * flags - flags sent or received with the user message, see Section
1462 * 5 for complete description of the flags.
1464 * Note: This function could use a rewrite especially when explicit
1465 * connect support comes in.
1467 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1469 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1471 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1472 struct msghdr *msg, size_t msg_len)
1474 struct sctp_sock *sp;
1475 struct sctp_endpoint *ep;
1476 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1477 struct sctp_transport *transport, *chunk_tp;
1478 struct sctp_chunk *chunk;
1480 struct sockaddr *msg_name = NULL;
1481 struct sctp_sndrcvinfo default_sinfo = { 0 };
1482 struct sctp_sndrcvinfo *sinfo;
1483 struct sctp_initmsg *sinit;
1484 sctp_assoc_t associd = 0;
1485 sctp_cmsgs_t cmsgs = { NULL };
1489 __u16 sinfo_flags = 0;
1490 struct sctp_datamsg *datamsg;
1491 int msg_flags = msg->msg_flags;
1493 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1500 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1502 /* We cannot send a message over a TCP-style listening socket. */
1503 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1508 /* Parse out the SCTP CMSGs. */
1509 err = sctp_msghdr_parse(msg, &cmsgs);
1512 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1516 /* Fetch the destination address for this packet. This
1517 * address only selects the association--it is not necessarily
1518 * the address we will send to.
1519 * For a peeled-off socket, msg_name is ignored.
1521 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1522 int msg_namelen = msg->msg_namelen;
1524 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1529 if (msg_namelen > sizeof(to))
1530 msg_namelen = sizeof(to);
1531 memcpy(&to, msg->msg_name, msg_namelen);
1532 msg_name = msg->msg_name;
1538 /* Did the user specify SNDRCVINFO? */
1540 sinfo_flags = sinfo->sinfo_flags;
1541 associd = sinfo->sinfo_assoc_id;
1544 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1545 msg_len, sinfo_flags);
1547 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1548 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1553 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1554 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1555 * If SCTP_ABORT is set, the message length could be non zero with
1556 * the msg_iov set to the user abort reason.
1558 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1559 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1564 /* If SCTP_ADDR_OVER is set, there must be an address
1565 * specified in msg_name.
1567 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1574 SCTP_DEBUG_PRINTK("About to look up association.\n");
1578 /* If a msg_name has been specified, assume this is to be used. */
1580 /* Look for a matching association on the endpoint. */
1581 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1583 /* If we could not find a matching association on the
1584 * endpoint, make sure that it is not a TCP-style
1585 * socket that already has an association or there is
1586 * no peeled-off association on another socket.
1588 if ((sctp_style(sk, TCP) &&
1589 sctp_sstate(sk, ESTABLISHED)) ||
1590 sctp_endpoint_is_peeled_off(ep, &to)) {
1591 err = -EADDRNOTAVAIL;
1596 asoc = sctp_id2assoc(sk, associd);
1604 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1606 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1607 * socket that has an association in CLOSED state. This can
1608 * happen when an accepted socket has an association that is
1611 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1616 if (sinfo_flags & SCTP_EOF) {
1617 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1619 sctp_primitive_SHUTDOWN(asoc, NULL);
1623 if (sinfo_flags & SCTP_ABORT) {
1625 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1631 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1632 sctp_primitive_ABORT(asoc, chunk);
1638 /* Do we need to create the association? */
1640 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1642 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1647 /* Check for invalid stream against the stream counts,
1648 * either the default or the user specified stream counts.
1651 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1652 /* Check against the defaults. */
1653 if (sinfo->sinfo_stream >=
1654 sp->initmsg.sinit_num_ostreams) {
1659 /* Check against the requested. */
1660 if (sinfo->sinfo_stream >=
1661 sinit->sinit_num_ostreams) {
1669 * API 3.1.2 bind() - UDP Style Syntax
1670 * If a bind() or sctp_bindx() is not called prior to a
1671 * sendmsg() call that initiates a new association, the
1672 * system picks an ephemeral port and will choose an address
1673 * set equivalent to binding with a wildcard address.
1675 if (!ep->base.bind_addr.port) {
1676 if (sctp_autobind(sk)) {
1682 * If an unprivileged user inherits a one-to-many
1683 * style socket with open associations on a privileged
1684 * port, it MAY be permitted to accept new associations,
1685 * but it SHOULD NOT be permitted to open new
1688 if (ep->base.bind_addr.port < PROT_SOCK &&
1689 !capable(CAP_NET_BIND_SERVICE)) {
1695 scope = sctp_scope(&to);
1696 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1702 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1708 /* If the SCTP_INIT ancillary data is specified, set all
1709 * the association init values accordingly.
1712 if (sinit->sinit_num_ostreams) {
1713 asoc->c.sinit_num_ostreams =
1714 sinit->sinit_num_ostreams;
1716 if (sinit->sinit_max_instreams) {
1717 asoc->c.sinit_max_instreams =
1718 sinit->sinit_max_instreams;
1720 if (sinit->sinit_max_attempts) {
1721 asoc->max_init_attempts
1722 = sinit->sinit_max_attempts;
1724 if (sinit->sinit_max_init_timeo) {
1725 asoc->max_init_timeo =
1726 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1730 /* Prime the peer's transport structures. */
1731 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1738 /* ASSERT: we have a valid association at this point. */
1739 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1742 /* If the user didn't specify SNDRCVINFO, make up one with
1745 default_sinfo.sinfo_stream = asoc->default_stream;
1746 default_sinfo.sinfo_flags = asoc->default_flags;
1747 default_sinfo.sinfo_ppid = asoc->default_ppid;
1748 default_sinfo.sinfo_context = asoc->default_context;
1749 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1750 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1751 sinfo = &default_sinfo;
1754 /* API 7.1.7, the sndbuf size per association bounds the
1755 * maximum size of data that can be sent in a single send call.
1757 if (msg_len > sk->sk_sndbuf) {
1762 if (asoc->pmtu_pending)
1763 sctp_assoc_pending_pmtu(asoc);
1765 /* If fragmentation is disabled and the message length exceeds the
1766 * association fragmentation point, return EMSGSIZE. The I-D
1767 * does not specify what this error is, but this looks like
1770 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1776 /* Check for invalid stream. */
1777 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1783 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1784 if (!sctp_wspace(asoc)) {
1785 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1790 /* If an address is passed with the sendto/sendmsg call, it is used
1791 * to override the primary destination address in the TCP model, or
1792 * when SCTP_ADDR_OVER flag is set in the UDP model.
1794 if ((sctp_style(sk, TCP) && msg_name) ||
1795 (sinfo_flags & SCTP_ADDR_OVER)) {
1796 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1804 /* Auto-connect, if we aren't connected already. */
1805 if (sctp_state(asoc, CLOSED)) {
1806 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1809 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1812 /* Break the message into multiple chunks of maximum size. */
1813 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1819 /* Now send the (possibly) fragmented message. */
1820 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1821 sctp_chunk_hold(chunk);
1823 /* Do accounting for the write space. */
1824 sctp_set_owner_w(chunk);
1826 chunk->transport = chunk_tp;
1829 /* Send it to the lower layers. Note: all chunks
1830 * must either fail or succeed. The lower layer
1831 * works that way today. Keep it that way or this
1834 err = sctp_primitive_SEND(asoc, datamsg);
1835 /* Did the lower layer accept the chunk? */
1837 sctp_datamsg_free(datamsg);
1839 sctp_datamsg_put(datamsg);
1841 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1848 /* If we are already past ASSOCIATE, the lower
1849 * layers are responsible for association cleanup.
1855 sctp_association_free(asoc);
1857 sctp_release_sock(sk);
1860 return sctp_error(sk, msg_flags, err);
1867 err = sock_error(sk);
1877 /* This is an extended version of skb_pull() that removes the data from the
1878 * start of a skb even when data is spread across the list of skb's in the
1879 * frag_list. len specifies the total amount of data that needs to be removed.
1880 * when 'len' bytes could be removed from the skb, it returns 0.
1881 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1882 * could not be removed.
1884 static int sctp_skb_pull(struct sk_buff *skb, int len)
1886 struct sk_buff *list;
1887 int skb_len = skb_headlen(skb);
1890 if (len <= skb_len) {
1891 __skb_pull(skb, len);
1895 __skb_pull(skb, skb_len);
1897 skb_walk_frags(skb, list) {
1898 rlen = sctp_skb_pull(list, len);
1899 skb->len -= (len-rlen);
1900 skb->data_len -= (len-rlen);
1911 /* API 3.1.3 recvmsg() - UDP Style Syntax
1913 * ssize_t recvmsg(int socket, struct msghdr *message,
1916 * socket - the socket descriptor of the endpoint.
1917 * message - pointer to the msghdr structure which contains a single
1918 * user message and possibly some ancillary data.
1920 * See Section 5 for complete description of the data
1923 * flags - flags sent or received with the user message, see Section
1924 * 5 for complete description of the flags.
1926 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1928 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1929 struct msghdr *msg, size_t len, int noblock,
1930 int flags, int *addr_len)
1932 struct sctp_ulpevent *event = NULL;
1933 struct sctp_sock *sp = sctp_sk(sk);
1934 struct sk_buff *skb;
1939 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1940 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1941 "len", len, "knoblauch", noblock,
1942 "flags", flags, "addr_len", addr_len);
1946 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1951 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1955 /* Get the total length of the skb including any skb's in the
1964 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1966 event = sctp_skb2event(skb);
1971 sock_recv_ts_and_drops(msg, sk, skb);
1972 if (sctp_ulpevent_is_notification(event)) {
1973 msg->msg_flags |= MSG_NOTIFICATION;
1974 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1976 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1979 /* Check if we allow SCTP_SNDRCVINFO. */
1980 if (sp->subscribe.sctp_data_io_event)
1981 sctp_ulpevent_read_sndrcvinfo(event, msg);
1983 /* FIXME: we should be calling IP/IPv6 layers. */
1984 if (sk->sk_protinfo.af_inet.cmsg_flags)
1985 ip_cmsg_recv(msg, skb);
1990 /* If skb's length exceeds the user's buffer, update the skb and
1991 * push it back to the receive_queue so that the next call to
1992 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1994 if (skb_len > copied) {
1995 msg->msg_flags &= ~MSG_EOR;
1996 if (flags & MSG_PEEK)
1998 sctp_skb_pull(skb, copied);
1999 skb_queue_head(&sk->sk_receive_queue, skb);
2001 /* When only partial message is copied to the user, increase
2002 * rwnd by that amount. If all the data in the skb is read,
2003 * rwnd is updated when the event is freed.
2005 if (!sctp_ulpevent_is_notification(event))
2006 sctp_assoc_rwnd_increase(event->asoc, copied);
2008 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2009 (event->msg_flags & MSG_EOR))
2010 msg->msg_flags |= MSG_EOR;
2012 msg->msg_flags &= ~MSG_EOR;
2015 if (flags & MSG_PEEK) {
2016 /* Release the skb reference acquired after peeking the skb in
2017 * sctp_skb_recv_datagram().
2021 /* Free the event which includes releasing the reference to
2022 * the owner of the skb, freeing the skb and updating the
2025 sctp_ulpevent_free(event);
2028 sctp_release_sock(sk);
2032 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2034 * This option is a on/off flag. If enabled no SCTP message
2035 * fragmentation will be performed. Instead if a message being sent
2036 * exceeds the current PMTU size, the message will NOT be sent and
2037 * instead a error will be indicated to the user.
2039 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2040 char __user *optval,
2041 unsigned int optlen)
2045 if (optlen < sizeof(int))
2048 if (get_user(val, (int __user *)optval))
2051 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2056 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2057 unsigned int optlen)
2059 if (optlen > sizeof(struct sctp_event_subscribe))
2061 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2066 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2068 * This socket option is applicable to the UDP-style socket only. When
2069 * set it will cause associations that are idle for more than the
2070 * specified number of seconds to automatically close. An association
2071 * being idle is defined an association that has NOT sent or received
2072 * user data. The special value of '0' indicates that no automatic
2073 * close of any associations should be performed. The option expects an
2074 * integer defining the number of seconds of idle time before an
2075 * association is closed.
2077 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2078 unsigned int optlen)
2080 struct sctp_sock *sp = sctp_sk(sk);
2082 /* Applicable to UDP-style socket only */
2083 if (sctp_style(sk, TCP))
2085 if (optlen != sizeof(int))
2087 if (copy_from_user(&sp->autoclose, optval, optlen))
2089 /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
2090 sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ);
2095 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2097 * Applications can enable or disable heartbeats for any peer address of
2098 * an association, modify an address's heartbeat interval, force a
2099 * heartbeat to be sent immediately, and adjust the address's maximum
2100 * number of retransmissions sent before an address is considered
2101 * unreachable. The following structure is used to access and modify an
2102 * address's parameters:
2104 * struct sctp_paddrparams {
2105 * sctp_assoc_t spp_assoc_id;
2106 * struct sockaddr_storage spp_address;
2107 * uint32_t spp_hbinterval;
2108 * uint16_t spp_pathmaxrxt;
2109 * uint32_t spp_pathmtu;
2110 * uint32_t spp_sackdelay;
2111 * uint32_t spp_flags;
2114 * spp_assoc_id - (one-to-many style socket) This is filled in the
2115 * application, and identifies the association for
2117 * spp_address - This specifies which address is of interest.
2118 * spp_hbinterval - This contains the value of the heartbeat interval,
2119 * in milliseconds. If a value of zero
2120 * is present in this field then no changes are to
2121 * be made to this parameter.
2122 * spp_pathmaxrxt - This contains the maximum number of
2123 * retransmissions before this address shall be
2124 * considered unreachable. If a value of zero
2125 * is present in this field then no changes are to
2126 * be made to this parameter.
2127 * spp_pathmtu - When Path MTU discovery is disabled the value
2128 * specified here will be the "fixed" path mtu.
2129 * Note that if the spp_address field is empty
2130 * then all associations on this address will
2131 * have this fixed path mtu set upon them.
2133 * spp_sackdelay - When delayed sack is enabled, this value specifies
2134 * the number of milliseconds that sacks will be delayed
2135 * for. This value will apply to all addresses of an
2136 * association if the spp_address field is empty. Note
2137 * also, that if delayed sack is enabled and this
2138 * value is set to 0, no change is made to the last
2139 * recorded delayed sack timer value.
2141 * spp_flags - These flags are used to control various features
2142 * on an association. The flag field may contain
2143 * zero or more of the following options.
2145 * SPP_HB_ENABLE - Enable heartbeats on the
2146 * specified address. Note that if the address
2147 * field is empty all addresses for the association
2148 * have heartbeats enabled upon them.
2150 * SPP_HB_DISABLE - Disable heartbeats on the
2151 * speicifed address. Note that if the address
2152 * field is empty all addresses for the association
2153 * will have their heartbeats disabled. Note also
2154 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2155 * mutually exclusive, only one of these two should
2156 * be specified. Enabling both fields will have
2157 * undetermined results.
2159 * SPP_HB_DEMAND - Request a user initiated heartbeat
2160 * to be made immediately.
2162 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2163 * heartbeat delayis to be set to the value of 0
2166 * SPP_PMTUD_ENABLE - This field will enable PMTU
2167 * discovery upon the specified address. Note that
2168 * if the address feild is empty then all addresses
2169 * on the association are effected.
2171 * SPP_PMTUD_DISABLE - This field will disable PMTU
2172 * discovery upon the specified address. Note that
2173 * if the address feild is empty then all addresses
2174 * on the association are effected. Not also that
2175 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2176 * exclusive. Enabling both will have undetermined
2179 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2180 * on delayed sack. The time specified in spp_sackdelay
2181 * is used to specify the sack delay for this address. Note
2182 * that if spp_address is empty then all addresses will
2183 * enable delayed sack and take on the sack delay
2184 * value specified in spp_sackdelay.
2185 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2186 * off delayed sack. If the spp_address field is blank then
2187 * delayed sack is disabled for the entire association. Note
2188 * also that this field is mutually exclusive to
2189 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2192 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2193 struct sctp_transport *trans,
2194 struct sctp_association *asoc,
2195 struct sctp_sock *sp,
2198 int sackdelay_change)
2202 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2203 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2208 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2209 * this field is ignored. Note also that a value of zero indicates
2210 * the current setting should be left unchanged.
2212 if (params->spp_flags & SPP_HB_ENABLE) {
2214 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2215 * set. This lets us use 0 value when this flag
2218 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2219 params->spp_hbinterval = 0;
2221 if (params->spp_hbinterval ||
2222 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2225 msecs_to_jiffies(params->spp_hbinterval);
2228 msecs_to_jiffies(params->spp_hbinterval);
2230 sp->hbinterval = params->spp_hbinterval;
2237 trans->param_flags =
2238 (trans->param_flags & ~SPP_HB) | hb_change;
2241 (asoc->param_flags & ~SPP_HB) | hb_change;
2244 (sp->param_flags & ~SPP_HB) | hb_change;
2248 /* When Path MTU discovery is disabled the value specified here will
2249 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2250 * include the flag SPP_PMTUD_DISABLE for this field to have any
2253 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2255 trans->pathmtu = params->spp_pathmtu;
2256 sctp_assoc_sync_pmtu(asoc);
2258 asoc->pathmtu = params->spp_pathmtu;
2259 sctp_frag_point(asoc, params->spp_pathmtu);
2261 sp->pathmtu = params->spp_pathmtu;
2267 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2268 (params->spp_flags & SPP_PMTUD_ENABLE);
2269 trans->param_flags =
2270 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2272 sctp_transport_pmtu(trans);
2273 sctp_assoc_sync_pmtu(asoc);
2277 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2280 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2284 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2285 * value of this field is ignored. Note also that a value of zero
2286 * indicates the current setting should be left unchanged.
2288 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2291 msecs_to_jiffies(params->spp_sackdelay);
2294 msecs_to_jiffies(params->spp_sackdelay);
2296 sp->sackdelay = params->spp_sackdelay;
2300 if (sackdelay_change) {
2302 trans->param_flags =
2303 (trans->param_flags & ~SPP_SACKDELAY) |
2307 (asoc->param_flags & ~SPP_SACKDELAY) |
2311 (sp->param_flags & ~SPP_SACKDELAY) |
2316 /* Note that a value of zero indicates the current setting should be
2319 if (params->spp_pathmaxrxt) {
2321 trans->pathmaxrxt = params->spp_pathmaxrxt;
2323 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2325 sp->pathmaxrxt = params->spp_pathmaxrxt;
2332 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2333 char __user *optval,
2334 unsigned int optlen)
2336 struct sctp_paddrparams params;
2337 struct sctp_transport *trans = NULL;
2338 struct sctp_association *asoc = NULL;
2339 struct sctp_sock *sp = sctp_sk(sk);
2341 int hb_change, pmtud_change, sackdelay_change;
2343 if (optlen != sizeof(struct sctp_paddrparams))
2346 if (copy_from_user(¶ms, optval, optlen))
2349 /* Validate flags and value parameters. */
2350 hb_change = params.spp_flags & SPP_HB;
2351 pmtud_change = params.spp_flags & SPP_PMTUD;
2352 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2354 if (hb_change == SPP_HB ||
2355 pmtud_change == SPP_PMTUD ||
2356 sackdelay_change == SPP_SACKDELAY ||
2357 params.spp_sackdelay > 500 ||
2358 (params.spp_pathmtu &&
2359 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2362 /* If an address other than INADDR_ANY is specified, and
2363 * no transport is found, then the request is invalid.
2365 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2366 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2367 params.spp_assoc_id);
2372 /* Get association, if assoc_id != 0 and the socket is a one
2373 * to many style socket, and an association was not found, then
2374 * the id was invalid.
2376 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2377 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2380 /* Heartbeat demand can only be sent on a transport or
2381 * association, but not a socket.
2383 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2386 /* Process parameters. */
2387 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2388 hb_change, pmtud_change,
2394 /* If changes are for association, also apply parameters to each
2397 if (!trans && asoc) {
2398 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2400 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2401 hb_change, pmtud_change,
2410 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2412 * This option will effect the way delayed acks are performed. This
2413 * option allows you to get or set the delayed ack time, in
2414 * milliseconds. It also allows changing the delayed ack frequency.
2415 * Changing the frequency to 1 disables the delayed sack algorithm. If
2416 * the assoc_id is 0, then this sets or gets the endpoints default
2417 * values. If the assoc_id field is non-zero, then the set or get
2418 * effects the specified association for the one to many model (the
2419 * assoc_id field is ignored by the one to one model). Note that if
2420 * sack_delay or sack_freq are 0 when setting this option, then the
2421 * current values will remain unchanged.
2423 * struct sctp_sack_info {
2424 * sctp_assoc_t sack_assoc_id;
2425 * uint32_t sack_delay;
2426 * uint32_t sack_freq;
2429 * sack_assoc_id - This parameter, indicates which association the user
2430 * is performing an action upon. Note that if this field's value is
2431 * zero then the endpoints default value is changed (effecting future
2432 * associations only).
2434 * sack_delay - This parameter contains the number of milliseconds that
2435 * the user is requesting the delayed ACK timer be set to. Note that
2436 * this value is defined in the standard to be between 200 and 500
2439 * sack_freq - This parameter contains the number of packets that must
2440 * be received before a sack is sent without waiting for the delay
2441 * timer to expire. The default value for this is 2, setting this
2442 * value to 1 will disable the delayed sack algorithm.
2445 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2446 char __user *optval, unsigned int optlen)
2448 struct sctp_sack_info params;
2449 struct sctp_transport *trans = NULL;
2450 struct sctp_association *asoc = NULL;
2451 struct sctp_sock *sp = sctp_sk(sk);
2453 if (optlen == sizeof(struct sctp_sack_info)) {
2454 if (copy_from_user(¶ms, optval, optlen))
2457 if (params.sack_delay == 0 && params.sack_freq == 0)
2459 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2460 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
2461 "in delayed_ack socket option deprecated\n");
2462 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
2463 if (copy_from_user(¶ms, optval, optlen))
2466 if (params.sack_delay == 0)
2467 params.sack_freq = 1;
2469 params.sack_freq = 0;
2473 /* Validate value parameter. */
2474 if (params.sack_delay > 500)
2477 /* Get association, if sack_assoc_id != 0 and the socket is a one
2478 * to many style socket, and an association was not found, then
2479 * the id was invalid.
2481 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2482 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2485 if (params.sack_delay) {
2488 msecs_to_jiffies(params.sack_delay);
2490 (asoc->param_flags & ~SPP_SACKDELAY) |
2491 SPP_SACKDELAY_ENABLE;
2493 sp->sackdelay = params.sack_delay;
2495 (sp->param_flags & ~SPP_SACKDELAY) |
2496 SPP_SACKDELAY_ENABLE;
2500 if (params.sack_freq == 1) {
2503 (asoc->param_flags & ~SPP_SACKDELAY) |
2504 SPP_SACKDELAY_DISABLE;
2507 (sp->param_flags & ~SPP_SACKDELAY) |
2508 SPP_SACKDELAY_DISABLE;
2510 } else if (params.sack_freq > 1) {
2512 asoc->sackfreq = params.sack_freq;
2514 (asoc->param_flags & ~SPP_SACKDELAY) |
2515 SPP_SACKDELAY_ENABLE;
2517 sp->sackfreq = params.sack_freq;
2519 (sp->param_flags & ~SPP_SACKDELAY) |
2520 SPP_SACKDELAY_ENABLE;
2524 /* If change is for association, also apply to each transport. */
2526 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2528 if (params.sack_delay) {
2530 msecs_to_jiffies(params.sack_delay);
2531 trans->param_flags =
2532 (trans->param_flags & ~SPP_SACKDELAY) |
2533 SPP_SACKDELAY_ENABLE;
2535 if (params.sack_freq == 1) {
2536 trans->param_flags =
2537 (trans->param_flags & ~SPP_SACKDELAY) |
2538 SPP_SACKDELAY_DISABLE;
2539 } else if (params.sack_freq > 1) {
2540 trans->sackfreq = params.sack_freq;
2541 trans->param_flags =
2542 (trans->param_flags & ~SPP_SACKDELAY) |
2543 SPP_SACKDELAY_ENABLE;
2551 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2553 * Applications can specify protocol parameters for the default association
2554 * initialization. The option name argument to setsockopt() and getsockopt()
2557 * Setting initialization parameters is effective only on an unconnected
2558 * socket (for UDP-style sockets only future associations are effected
2559 * by the change). With TCP-style sockets, this option is inherited by
2560 * sockets derived from a listener socket.
2562 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2564 struct sctp_initmsg sinit;
2565 struct sctp_sock *sp = sctp_sk(sk);
2567 if (optlen != sizeof(struct sctp_initmsg))
2569 if (copy_from_user(&sinit, optval, optlen))
2572 if (sinit.sinit_num_ostreams)
2573 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2574 if (sinit.sinit_max_instreams)
2575 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2576 if (sinit.sinit_max_attempts)
2577 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2578 if (sinit.sinit_max_init_timeo)
2579 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2585 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2587 * Applications that wish to use the sendto() system call may wish to
2588 * specify a default set of parameters that would normally be supplied
2589 * through the inclusion of ancillary data. This socket option allows
2590 * such an application to set the default sctp_sndrcvinfo structure.
2591 * The application that wishes to use this socket option simply passes
2592 * in to this call the sctp_sndrcvinfo structure defined in Section
2593 * 5.2.2) The input parameters accepted by this call include
2594 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2595 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2596 * to this call if the caller is using the UDP model.
2598 static int sctp_setsockopt_default_send_param(struct sock *sk,
2599 char __user *optval,
2600 unsigned int optlen)
2602 struct sctp_sndrcvinfo info;
2603 struct sctp_association *asoc;
2604 struct sctp_sock *sp = sctp_sk(sk);
2606 if (optlen != sizeof(struct sctp_sndrcvinfo))
2608 if (copy_from_user(&info, optval, optlen))
2611 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2612 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2616 asoc->default_stream = info.sinfo_stream;
2617 asoc->default_flags = info.sinfo_flags;
2618 asoc->default_ppid = info.sinfo_ppid;
2619 asoc->default_context = info.sinfo_context;
2620 asoc->default_timetolive = info.sinfo_timetolive;
2622 sp->default_stream = info.sinfo_stream;
2623 sp->default_flags = info.sinfo_flags;
2624 sp->default_ppid = info.sinfo_ppid;
2625 sp->default_context = info.sinfo_context;
2626 sp->default_timetolive = info.sinfo_timetolive;
2632 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2634 * Requests that the local SCTP stack use the enclosed peer address as
2635 * the association primary. The enclosed address must be one of the
2636 * association peer's addresses.
2638 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2639 unsigned int optlen)
2641 struct sctp_prim prim;
2642 struct sctp_transport *trans;
2644 if (optlen != sizeof(struct sctp_prim))
2647 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2650 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2654 sctp_assoc_set_primary(trans->asoc, trans);
2660 * 7.1.5 SCTP_NODELAY
2662 * Turn on/off any Nagle-like algorithm. This means that packets are
2663 * generally sent as soon as possible and no unnecessary delays are
2664 * introduced, at the cost of more packets in the network. Expects an
2665 * integer boolean flag.
2667 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2668 unsigned int optlen)
2672 if (optlen < sizeof(int))
2674 if (get_user(val, (int __user *)optval))
2677 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2683 * 7.1.1 SCTP_RTOINFO
2685 * The protocol parameters used to initialize and bound retransmission
2686 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2687 * and modify these parameters.
2688 * All parameters are time values, in milliseconds. A value of 0, when
2689 * modifying the parameters, indicates that the current value should not
2693 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2695 struct sctp_rtoinfo rtoinfo;
2696 struct sctp_association *asoc;
2698 if (optlen != sizeof (struct sctp_rtoinfo))
2701 if (copy_from_user(&rtoinfo, optval, optlen))
2704 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2706 /* Set the values to the specific association */
2707 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2711 if (rtoinfo.srto_initial != 0)
2713 msecs_to_jiffies(rtoinfo.srto_initial);
2714 if (rtoinfo.srto_max != 0)
2715 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2716 if (rtoinfo.srto_min != 0)
2717 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2719 /* If there is no association or the association-id = 0
2720 * set the values to the endpoint.
2722 struct sctp_sock *sp = sctp_sk(sk);
2724 if (rtoinfo.srto_initial != 0)
2725 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2726 if (rtoinfo.srto_max != 0)
2727 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2728 if (rtoinfo.srto_min != 0)
2729 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2737 * 7.1.2 SCTP_ASSOCINFO
2739 * This option is used to tune the maximum retransmission attempts
2740 * of the association.
2741 * Returns an error if the new association retransmission value is
2742 * greater than the sum of the retransmission value of the peer.
2743 * See [SCTP] for more information.
2746 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2749 struct sctp_assocparams assocparams;
2750 struct sctp_association *asoc;
2752 if (optlen != sizeof(struct sctp_assocparams))
2754 if (copy_from_user(&assocparams, optval, optlen))
2757 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2759 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2762 /* Set the values to the specific association */
2764 if (assocparams.sasoc_asocmaxrxt != 0) {
2767 struct sctp_transport *peer_addr;
2769 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2771 path_sum += peer_addr->pathmaxrxt;
2775 /* Only validate asocmaxrxt if we have more than
2776 * one path/transport. We do this because path
2777 * retransmissions are only counted when we have more
2781 assocparams.sasoc_asocmaxrxt > path_sum)
2784 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2787 if (assocparams.sasoc_cookie_life != 0) {
2788 asoc->cookie_life.tv_sec =
2789 assocparams.sasoc_cookie_life / 1000;
2790 asoc->cookie_life.tv_usec =
2791 (assocparams.sasoc_cookie_life % 1000)
2795 /* Set the values to the endpoint */
2796 struct sctp_sock *sp = sctp_sk(sk);
2798 if (assocparams.sasoc_asocmaxrxt != 0)
2799 sp->assocparams.sasoc_asocmaxrxt =
2800 assocparams.sasoc_asocmaxrxt;
2801 if (assocparams.sasoc_cookie_life != 0)
2802 sp->assocparams.sasoc_cookie_life =
2803 assocparams.sasoc_cookie_life;
2809 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2811 * This socket option is a boolean flag which turns on or off mapped V4
2812 * addresses. If this option is turned on and the socket is type
2813 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2814 * If this option is turned off, then no mapping will be done of V4
2815 * addresses and a user will receive both PF_INET6 and PF_INET type
2816 * addresses on the socket.
2818 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2821 struct sctp_sock *sp = sctp_sk(sk);
2823 if (optlen < sizeof(int))
2825 if (get_user(val, (int __user *)optval))
2836 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2837 * This option will get or set the maximum size to put in any outgoing
2838 * SCTP DATA chunk. If a message is larger than this size it will be
2839 * fragmented by SCTP into the specified size. Note that the underlying
2840 * SCTP implementation may fragment into smaller sized chunks when the
2841 * PMTU of the underlying association is smaller than the value set by
2842 * the user. The default value for this option is '0' which indicates
2843 * the user is NOT limiting fragmentation and only the PMTU will effect
2844 * SCTP's choice of DATA chunk size. Note also that values set larger
2845 * than the maximum size of an IP datagram will effectively let SCTP
2846 * control fragmentation (i.e. the same as setting this option to 0).
2848 * The following structure is used to access and modify this parameter:
2850 * struct sctp_assoc_value {
2851 * sctp_assoc_t assoc_id;
2852 * uint32_t assoc_value;
2855 * assoc_id: This parameter is ignored for one-to-one style sockets.
2856 * For one-to-many style sockets this parameter indicates which
2857 * association the user is performing an action upon. Note that if
2858 * this field's value is zero then the endpoints default value is
2859 * changed (effecting future associations only).
2860 * assoc_value: This parameter specifies the maximum size in bytes.
2862 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2864 struct sctp_assoc_value params;
2865 struct sctp_association *asoc;
2866 struct sctp_sock *sp = sctp_sk(sk);
2869 if (optlen == sizeof(int)) {
2871 "SCTP: Use of int in maxseg socket option deprecated\n");
2873 "SCTP: Use struct sctp_assoc_value instead\n");
2874 if (copy_from_user(&val, optval, optlen))
2876 params.assoc_id = 0;
2877 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2878 if (copy_from_user(¶ms, optval, optlen))
2880 val = params.assoc_value;
2884 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2887 asoc = sctp_id2assoc(sk, params.assoc_id);
2888 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2893 val = asoc->pathmtu;
2894 val -= sp->pf->af->net_header_len;
2895 val -= sizeof(struct sctphdr) +
2896 sizeof(struct sctp_data_chunk);
2898 asoc->user_frag = val;
2899 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
2901 sp->user_frag = val;
2909 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2911 * Requests that the peer mark the enclosed address as the association
2912 * primary. The enclosed address must be one of the association's
2913 * locally bound addresses. The following structure is used to make a
2914 * set primary request:
2916 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2917 unsigned int optlen)
2919 struct sctp_sock *sp;
2920 struct sctp_endpoint *ep;
2921 struct sctp_association *asoc = NULL;
2922 struct sctp_setpeerprim prim;
2923 struct sctp_chunk *chunk;
2929 if (!sctp_addip_enable)
2932 if (optlen != sizeof(struct sctp_setpeerprim))
2935 if (copy_from_user(&prim, optval, optlen))
2938 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2942 if (!asoc->peer.asconf_capable)
2945 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2948 if (!sctp_state(asoc, ESTABLISHED))
2951 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2952 return -EADDRNOTAVAIL;
2954 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2955 chunk = sctp_make_asconf_set_prim(asoc,
2956 (union sctp_addr *)&prim.sspp_addr);
2960 err = sctp_send_asconf(asoc, chunk);
2962 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2967 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2968 unsigned int optlen)
2970 struct sctp_setadaptation adaptation;
2972 if (optlen != sizeof(struct sctp_setadaptation))
2974 if (copy_from_user(&adaptation, optval, optlen))
2977 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
2983 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2985 * The context field in the sctp_sndrcvinfo structure is normally only
2986 * used when a failed message is retrieved holding the value that was
2987 * sent down on the actual send call. This option allows the setting of
2988 * a default context on an association basis that will be received on
2989 * reading messages from the peer. This is especially helpful in the
2990 * one-2-many model for an application to keep some reference to an
2991 * internal state machine that is processing messages on the
2992 * association. Note that the setting of this value only effects
2993 * received messages from the peer and does not effect the value that is
2994 * saved with outbound messages.
2996 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
2997 unsigned int optlen)
2999 struct sctp_assoc_value params;
3000 struct sctp_sock *sp;
3001 struct sctp_association *asoc;
3003 if (optlen != sizeof(struct sctp_assoc_value))
3005 if (copy_from_user(¶ms, optval, optlen))
3010 if (params.assoc_id != 0) {
3011 asoc = sctp_id2assoc(sk, params.assoc_id);
3014 asoc->default_rcv_context = params.assoc_value;
3016 sp->default_rcv_context = params.assoc_value;
3023 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3025 * This options will at a minimum specify if the implementation is doing
3026 * fragmented interleave. Fragmented interleave, for a one to many
3027 * socket, is when subsequent calls to receive a message may return
3028 * parts of messages from different associations. Some implementations
3029 * may allow you to turn this value on or off. If so, when turned off,
3030 * no fragment interleave will occur (which will cause a head of line
3031 * blocking amongst multiple associations sharing the same one to many
3032 * socket). When this option is turned on, then each receive call may
3033 * come from a different association (thus the user must receive data
3034 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3035 * association each receive belongs to.
3037 * This option takes a boolean value. A non-zero value indicates that
3038 * fragmented interleave is on. A value of zero indicates that
3039 * fragmented interleave is off.
3041 * Note that it is important that an implementation that allows this
3042 * option to be turned on, have it off by default. Otherwise an unaware
3043 * application using the one to many model may become confused and act
3046 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3047 char __user *optval,
3048 unsigned int optlen)
3052 if (optlen != sizeof(int))
3054 if (get_user(val, (int __user *)optval))
3057 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3063 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3064 * (SCTP_PARTIAL_DELIVERY_POINT)
3066 * This option will set or get the SCTP partial delivery point. This
3067 * point is the size of a message where the partial delivery API will be
3068 * invoked to help free up rwnd space for the peer. Setting this to a
3069 * lower value will cause partial deliveries to happen more often. The
3070 * calls argument is an integer that sets or gets the partial delivery
3071 * point. Note also that the call will fail if the user attempts to set
3072 * this value larger than the socket receive buffer size.
3074 * Note that any single message having a length smaller than or equal to
3075 * the SCTP partial delivery point will be delivered in one single read
3076 * call as long as the user provided buffer is large enough to hold the
3079 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3080 char __user *optval,
3081 unsigned int optlen)
3085 if (optlen != sizeof(u32))
3087 if (get_user(val, (int __user *)optval))
3090 /* Note: We double the receive buffer from what the user sets
3091 * it to be, also initial rwnd is based on rcvbuf/2.
3093 if (val > (sk->sk_rcvbuf >> 1))
3096 sctp_sk(sk)->pd_point = val;
3098 return 0; /* is this the right error code? */
3102 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3104 * This option will allow a user to change the maximum burst of packets
3105 * that can be emitted by this association. Note that the default value
3106 * is 4, and some implementations may restrict this setting so that it
3107 * can only be lowered.
3109 * NOTE: This text doesn't seem right. Do this on a socket basis with
3110 * future associations inheriting the socket value.
3112 static int sctp_setsockopt_maxburst(struct sock *sk,
3113 char __user *optval,
3114 unsigned int optlen)
3116 struct sctp_assoc_value params;
3117 struct sctp_sock *sp;
3118 struct sctp_association *asoc;
3122 if (optlen == sizeof(int)) {
3124 "SCTP: Use of int in max_burst socket option deprecated\n");
3126 "SCTP: Use struct sctp_assoc_value instead\n");
3127 if (copy_from_user(&val, optval, optlen))
3129 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3130 if (copy_from_user(¶ms, optval, optlen))
3132 val = params.assoc_value;
3133 assoc_id = params.assoc_id;
3139 if (assoc_id != 0) {
3140 asoc = sctp_id2assoc(sk, assoc_id);
3143 asoc->max_burst = val;
3145 sp->max_burst = val;
3151 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3153 * This set option adds a chunk type that the user is requesting to be
3154 * received only in an authenticated way. Changes to the list of chunks
3155 * will only effect future associations on the socket.
3157 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3158 char __user *optval,
3159 unsigned int optlen)
3161 struct sctp_authchunk val;
3163 if (!sctp_auth_enable)
3166 if (optlen != sizeof(struct sctp_authchunk))
3168 if (copy_from_user(&val, optval, optlen))
3171 switch (val.sauth_chunk) {
3173 case SCTP_CID_INIT_ACK:
3174 case SCTP_CID_SHUTDOWN_COMPLETE:
3179 /* add this chunk id to the endpoint */
3180 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3184 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3186 * This option gets or sets the list of HMAC algorithms that the local
3187 * endpoint requires the peer to use.
3189 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3190 char __user *optval,
3191 unsigned int optlen)
3193 struct sctp_hmacalgo *hmacs;
3197 if (!sctp_auth_enable)
3200 if (optlen < sizeof(struct sctp_hmacalgo))
3203 hmacs = kmalloc(optlen, GFP_KERNEL);
3207 if (copy_from_user(hmacs, optval, optlen)) {
3212 idents = hmacs->shmac_num_idents;
3213 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3214 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3219 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3226 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3228 * This option will set a shared secret key which is used to build an
3229 * association shared key.
3231 static int sctp_setsockopt_auth_key(struct sock *sk,
3232 char __user *optval,
3233 unsigned int optlen)
3235 struct sctp_authkey *authkey;
3236 struct sctp_association *asoc;
3239 if (!sctp_auth_enable)
3242 if (optlen <= sizeof(struct sctp_authkey))
3245 authkey = kmalloc(optlen, GFP_KERNEL);
3249 if (copy_from_user(authkey, optval, optlen)) {
3254 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3259 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3260 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3265 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3272 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3274 * This option will get or set the active shared key to be used to build
3275 * the association shared key.
3277 static int sctp_setsockopt_active_key(struct sock *sk,
3278 char __user *optval,
3279 unsigned int optlen)
3281 struct sctp_authkeyid val;
3282 struct sctp_association *asoc;
3284 if (!sctp_auth_enable)
3287 if (optlen != sizeof(struct sctp_authkeyid))
3289 if (copy_from_user(&val, optval, optlen))
3292 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3293 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3296 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3297 val.scact_keynumber);
3301 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3303 * This set option will delete a shared secret key from use.
3305 static int sctp_setsockopt_del_key(struct sock *sk,
3306 char __user *optval,
3307 unsigned int optlen)
3309 struct sctp_authkeyid val;
3310 struct sctp_association *asoc;
3312 if (!sctp_auth_enable)
3315 if (optlen != sizeof(struct sctp_authkeyid))
3317 if (copy_from_user(&val, optval, optlen))
3320 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3321 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3324 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3325 val.scact_keynumber);
3330 /* API 6.2 setsockopt(), getsockopt()
3332 * Applications use setsockopt() and getsockopt() to set or retrieve
3333 * socket options. Socket options are used to change the default
3334 * behavior of sockets calls. They are described in Section 7.
3338 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3339 * int __user *optlen);
3340 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3343 * sd - the socket descript.
3344 * level - set to IPPROTO_SCTP for all SCTP options.
3345 * optname - the option name.
3346 * optval - the buffer to store the value of the option.
3347 * optlen - the size of the buffer.
3349 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3350 char __user *optval, unsigned int optlen)
3354 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3357 /* I can hardly begin to describe how wrong this is. This is
3358 * so broken as to be worse than useless. The API draft
3359 * REALLY is NOT helpful here... I am not convinced that the
3360 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3361 * are at all well-founded.
3363 if (level != SOL_SCTP) {
3364 struct sctp_af *af = sctp_sk(sk)->pf->af;
3365 retval = af->setsockopt(sk, level, optname, optval, optlen);
3372 case SCTP_SOCKOPT_BINDX_ADD:
3373 /* 'optlen' is the size of the addresses buffer. */
3374 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3375 optlen, SCTP_BINDX_ADD_ADDR);
3378 case SCTP_SOCKOPT_BINDX_REM:
3379 /* 'optlen' is the size of the addresses buffer. */
3380 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3381 optlen, SCTP_BINDX_REM_ADDR);
3384 case SCTP_SOCKOPT_CONNECTX_OLD:
3385 /* 'optlen' is the size of the addresses buffer. */
3386 retval = sctp_setsockopt_connectx_old(sk,
3387 (struct sockaddr __user *)optval,
3391 case SCTP_SOCKOPT_CONNECTX:
3392 /* 'optlen' is the size of the addresses buffer. */
3393 retval = sctp_setsockopt_connectx(sk,
3394 (struct sockaddr __user *)optval,
3398 case SCTP_DISABLE_FRAGMENTS:
3399 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3403 retval = sctp_setsockopt_events(sk, optval, optlen);
3406 case SCTP_AUTOCLOSE:
3407 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3410 case SCTP_PEER_ADDR_PARAMS:
3411 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3414 case SCTP_DELAYED_ACK:
3415 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3417 case SCTP_PARTIAL_DELIVERY_POINT:
3418 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3422 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3424 case SCTP_DEFAULT_SEND_PARAM:
3425 retval = sctp_setsockopt_default_send_param(sk, optval,
3428 case SCTP_PRIMARY_ADDR:
3429 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3431 case SCTP_SET_PEER_PRIMARY_ADDR:
3432 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3435 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3438 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3440 case SCTP_ASSOCINFO:
3441 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3443 case SCTP_I_WANT_MAPPED_V4_ADDR:
3444 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3447 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3449 case SCTP_ADAPTATION_LAYER:
3450 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3453 retval = sctp_setsockopt_context(sk, optval, optlen);
3455 case SCTP_FRAGMENT_INTERLEAVE:
3456 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3458 case SCTP_MAX_BURST:
3459 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3461 case SCTP_AUTH_CHUNK:
3462 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3464 case SCTP_HMAC_IDENT:
3465 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3468 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3470 case SCTP_AUTH_ACTIVE_KEY:
3471 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3473 case SCTP_AUTH_DELETE_KEY:
3474 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3477 retval = -ENOPROTOOPT;
3481 sctp_release_sock(sk);
3487 /* API 3.1.6 connect() - UDP Style Syntax
3489 * An application may use the connect() call in the UDP model to initiate an
3490 * association without sending data.
3494 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3496 * sd: the socket descriptor to have a new association added to.
3498 * nam: the address structure (either struct sockaddr_in or struct
3499 * sockaddr_in6 defined in RFC2553 [7]).
3501 * len: the size of the address.
3503 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3511 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3512 __func__, sk, addr, addr_len);
3514 /* Validate addr_len before calling common connect/connectx routine. */
3515 af = sctp_get_af_specific(addr->sa_family);
3516 if (!af || addr_len < af->sockaddr_len) {
3519 /* Pass correct addr len to common routine (so it knows there
3520 * is only one address being passed.
3522 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3525 sctp_release_sock(sk);
3529 /* FIXME: Write comments. */
3530 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3532 return -EOPNOTSUPP; /* STUB */
3535 /* 4.1.4 accept() - TCP Style Syntax
3537 * Applications use accept() call to remove an established SCTP
3538 * association from the accept queue of the endpoint. A new socket
3539 * descriptor will be returned from accept() to represent the newly
3540 * formed association.
3542 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3544 struct sctp_sock *sp;
3545 struct sctp_endpoint *ep;
3546 struct sock *newsk = NULL;
3547 struct sctp_association *asoc;
3556 if (!sctp_style(sk, TCP)) {
3557 error = -EOPNOTSUPP;
3561 if (!sctp_sstate(sk, LISTENING)) {
3566 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3568 error = sctp_wait_for_accept(sk, timeo);
3572 /* We treat the list of associations on the endpoint as the accept
3573 * queue and pick the first association on the list.
3575 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3577 newsk = sp->pf->create_accept_sk(sk, asoc);
3583 /* Populate the fields of the newsk from the oldsk and migrate the
3584 * asoc to the newsk.
3586 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3589 sctp_release_sock(sk);
3594 /* The SCTP ioctl handler. */
3595 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3597 return -ENOIOCTLCMD;
3600 /* This is the function which gets called during socket creation to
3601 * initialized the SCTP-specific portion of the sock.
3602 * The sock structure should already be zero-filled memory.
3604 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3606 struct sctp_endpoint *ep;
3607 struct sctp_sock *sp;
3609 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3613 /* Initialize the SCTP per socket area. */
3614 switch (sk->sk_type) {
3615 case SOCK_SEQPACKET:
3616 sp->type = SCTP_SOCKET_UDP;
3619 sp->type = SCTP_SOCKET_TCP;
3622 return -ESOCKTNOSUPPORT;
3625 /* Initialize default send parameters. These parameters can be
3626 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3628 sp->default_stream = 0;
3629 sp->default_ppid = 0;
3630 sp->default_flags = 0;
3631 sp->default_context = 0;
3632 sp->default_timetolive = 0;
3634 sp->default_rcv_context = 0;
3635 sp->max_burst = sctp_max_burst;
3637 /* Initialize default setup parameters. These parameters
3638 * can be modified with the SCTP_INITMSG socket option or
3639 * overridden by the SCTP_INIT CMSG.
3641 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3642 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3643 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3644 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3646 /* Initialize default RTO related parameters. These parameters can
3647 * be modified for with the SCTP_RTOINFO socket option.
3649 sp->rtoinfo.srto_initial = sctp_rto_initial;
3650 sp->rtoinfo.srto_max = sctp_rto_max;
3651 sp->rtoinfo.srto_min = sctp_rto_min;
3653 /* Initialize default association related parameters. These parameters
3654 * can be modified with the SCTP_ASSOCINFO socket option.
3656 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3657 sp->assocparams.sasoc_number_peer_destinations = 0;
3658 sp->assocparams.sasoc_peer_rwnd = 0;
3659 sp->assocparams.sasoc_local_rwnd = 0;
3660 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3662 /* Initialize default event subscriptions. By default, all the
3665 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3667 /* Default Peer Address Parameters. These defaults can
3668 * be modified via SCTP_PEER_ADDR_PARAMS
3670 sp->hbinterval = sctp_hb_interval;
3671 sp->pathmaxrxt = sctp_max_retrans_path;
3672 sp->pathmtu = 0; // allow default discovery
3673 sp->sackdelay = sctp_sack_timeout;
3675 sp->param_flags = SPP_HB_ENABLE |
3677 SPP_SACKDELAY_ENABLE;
3679 /* If enabled no SCTP message fragmentation will be performed.
3680 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3682 sp->disable_fragments = 0;
3684 /* Enable Nagle algorithm by default. */
3687 /* Enable by default. */
3690 /* Auto-close idle associations after the configured
3691 * number of seconds. A value of 0 disables this
3692 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3693 * for UDP-style sockets only.
3697 /* User specified fragmentation limit. */
3700 sp->adaptation_ind = 0;
3702 sp->pf = sctp_get_pf_specific(sk->sk_family);
3704 /* Control variables for partial data delivery. */
3705 atomic_set(&sp->pd_mode, 0);
3706 skb_queue_head_init(&sp->pd_lobby);
3707 sp->frag_interleave = 0;
3709 /* Create a per socket endpoint structure. Even if we
3710 * change the data structure relationships, this may still
3711 * be useful for storing pre-connect address information.
3713 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3720 SCTP_DBG_OBJCNT_INC(sock);
3721 percpu_counter_inc(&sctp_sockets_allocated);
3724 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3730 /* Cleanup any SCTP per socket resources. */
3731 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3733 struct sctp_endpoint *ep;
3735 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3737 /* Release our hold on the endpoint. */
3738 ep = sctp_sk(sk)->ep;
3739 sctp_endpoint_free(ep);
3740 percpu_counter_dec(&sctp_sockets_allocated);
3742 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3746 /* API 4.1.7 shutdown() - TCP Style Syntax
3747 * int shutdown(int socket, int how);
3749 * sd - the socket descriptor of the association to be closed.
3750 * how - Specifies the type of shutdown. The values are
3753 * Disables further receive operations. No SCTP
3754 * protocol action is taken.
3756 * Disables further send operations, and initiates
3757 * the SCTP shutdown sequence.
3759 * Disables further send and receive operations
3760 * and initiates the SCTP shutdown sequence.
3762 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3764 struct sctp_endpoint *ep;
3765 struct sctp_association *asoc;
3767 if (!sctp_style(sk, TCP))
3770 if (how & SEND_SHUTDOWN) {
3771 ep = sctp_sk(sk)->ep;
3772 if (!list_empty(&ep->asocs)) {
3773 asoc = list_entry(ep->asocs.next,
3774 struct sctp_association, asocs);
3775 sctp_primitive_SHUTDOWN(asoc, NULL);
3780 /* 7.2.1 Association Status (SCTP_STATUS)
3782 * Applications can retrieve current status information about an
3783 * association, including association state, peer receiver window size,
3784 * number of unacked data chunks, and number of data chunks pending
3785 * receipt. This information is read-only.
3787 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3788 char __user *optval,
3791 struct sctp_status status;
3792 struct sctp_association *asoc = NULL;
3793 struct sctp_transport *transport;
3794 sctp_assoc_t associd;
3797 if (len < sizeof(status)) {
3802 len = sizeof(status);
3803 if (copy_from_user(&status, optval, len)) {
3808 associd = status.sstat_assoc_id;
3809 asoc = sctp_id2assoc(sk, associd);
3815 transport = asoc->peer.primary_path;
3817 status.sstat_assoc_id = sctp_assoc2id(asoc);
3818 status.sstat_state = asoc->state;
3819 status.sstat_rwnd = asoc->peer.rwnd;
3820 status.sstat_unackdata = asoc->unack_data;
3822 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3823 status.sstat_instrms = asoc->c.sinit_max_instreams;
3824 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3825 status.sstat_fragmentation_point = asoc->frag_point;
3826 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3827 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3828 transport->af_specific->sockaddr_len);
3829 /* Map ipv4 address into v4-mapped-on-v6 address. */
3830 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3831 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3832 status.sstat_primary.spinfo_state = transport->state;
3833 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3834 status.sstat_primary.spinfo_srtt = transport->srtt;
3835 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3836 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3838 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3839 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3841 if (put_user(len, optlen)) {
3846 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3847 len, status.sstat_state, status.sstat_rwnd,
3848 status.sstat_assoc_id);
3850 if (copy_to_user(optval, &status, len)) {
3860 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3862 * Applications can retrieve information about a specific peer address
3863 * of an association, including its reachability state, congestion
3864 * window, and retransmission timer values. This information is
3867 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3868 char __user *optval,
3871 struct sctp_paddrinfo pinfo;
3872 struct sctp_transport *transport;
3875 if (len < sizeof(pinfo)) {
3880 len = sizeof(pinfo);
3881 if (copy_from_user(&pinfo, optval, len)) {
3886 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3887 pinfo.spinfo_assoc_id);
3891 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3892 pinfo.spinfo_state = transport->state;
3893 pinfo.spinfo_cwnd = transport->cwnd;
3894 pinfo.spinfo_srtt = transport->srtt;
3895 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3896 pinfo.spinfo_mtu = transport->pathmtu;
3898 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3899 pinfo.spinfo_state = SCTP_ACTIVE;
3901 if (put_user(len, optlen)) {
3906 if (copy_to_user(optval, &pinfo, len)) {
3915 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3917 * This option is a on/off flag. If enabled no SCTP message
3918 * fragmentation will be performed. Instead if a message being sent
3919 * exceeds the current PMTU size, the message will NOT be sent and
3920 * instead a error will be indicated to the user.
3922 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3923 char __user *optval, int __user *optlen)
3927 if (len < sizeof(int))
3931 val = (sctp_sk(sk)->disable_fragments == 1);
3932 if (put_user(len, optlen))
3934 if (copy_to_user(optval, &val, len))
3939 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3941 * This socket option is used to specify various notifications and
3942 * ancillary data the user wishes to receive.
3944 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3947 if (len < sizeof(struct sctp_event_subscribe))
3949 len = sizeof(struct sctp_event_subscribe);
3950 if (put_user(len, optlen))
3952 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3957 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3959 * This socket option is applicable to the UDP-style socket only. When
3960 * set it will cause associations that are idle for more than the
3961 * specified number of seconds to automatically close. An association
3962 * being idle is defined an association that has NOT sent or received
3963 * user data. The special value of '0' indicates that no automatic
3964 * close of any associations should be performed. The option expects an
3965 * integer defining the number of seconds of idle time before an
3966 * association is closed.
3968 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3970 /* Applicable to UDP-style socket only */
3971 if (sctp_style(sk, TCP))
3973 if (len < sizeof(int))
3976 if (put_user(len, optlen))
3978 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
3983 /* Helper routine to branch off an association to a new socket. */
3984 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3985 struct socket **sockp)
3987 struct sock *sk = asoc->base.sk;
3988 struct socket *sock;
3992 /* An association cannot be branched off from an already peeled-off
3993 * socket, nor is this supported for tcp style sockets.
3995 if (!sctp_style(sk, UDP))
3998 /* Create a new socket. */
3999 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4003 sctp_copy_sock(sock->sk, sk, asoc);
4005 /* Make peeled-off sockets more like 1-1 accepted sockets.
4006 * Set the daddr and initialize id to something more random
4008 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4009 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4011 /* Populate the fields of the newsk from the oldsk and migrate the
4012 * asoc to the newsk.
4014 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4021 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4023 sctp_peeloff_arg_t peeloff;
4024 struct socket *newsock;
4026 struct sctp_association *asoc;
4028 if (len < sizeof(sctp_peeloff_arg_t))
4030 len = sizeof(sctp_peeloff_arg_t);
4031 if (copy_from_user(&peeloff, optval, len))
4034 asoc = sctp_id2assoc(sk, peeloff.associd);
4040 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
4042 retval = sctp_do_peeloff(asoc, &newsock);
4046 /* Map the socket to an unused fd that can be returned to the user. */
4047 retval = sock_map_fd(newsock, 0);
4049 sock_release(newsock);
4053 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4054 __func__, sk, asoc, newsock->sk, retval);
4056 /* Return the fd mapped to the new socket. */
4057 peeloff.sd = retval;
4058 if (put_user(len, optlen))
4060 if (copy_to_user(optval, &peeloff, len))
4067 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4069 * Applications can enable or disable heartbeats for any peer address of
4070 * an association, modify an address's heartbeat interval, force a
4071 * heartbeat to be sent immediately, and adjust the address's maximum
4072 * number of retransmissions sent before an address is considered
4073 * unreachable. The following structure is used to access and modify an
4074 * address's parameters:
4076 * struct sctp_paddrparams {
4077 * sctp_assoc_t spp_assoc_id;
4078 * struct sockaddr_storage spp_address;
4079 * uint32_t spp_hbinterval;
4080 * uint16_t spp_pathmaxrxt;
4081 * uint32_t spp_pathmtu;
4082 * uint32_t spp_sackdelay;
4083 * uint32_t spp_flags;
4086 * spp_assoc_id - (one-to-many style socket) This is filled in the
4087 * application, and identifies the association for
4089 * spp_address - This specifies which address is of interest.
4090 * spp_hbinterval - This contains the value of the heartbeat interval,
4091 * in milliseconds. If a value of zero
4092 * is present in this field then no changes are to
4093 * be made to this parameter.
4094 * spp_pathmaxrxt - This contains the maximum number of
4095 * retransmissions before this address shall be
4096 * considered unreachable. If a value of zero
4097 * is present in this field then no changes are to
4098 * be made to this parameter.
4099 * spp_pathmtu - When Path MTU discovery is disabled the value
4100 * specified here will be the "fixed" path mtu.
4101 * Note that if the spp_address field is empty
4102 * then all associations on this address will
4103 * have this fixed path mtu set upon them.
4105 * spp_sackdelay - When delayed sack is enabled, this value specifies
4106 * the number of milliseconds that sacks will be delayed
4107 * for. This value will apply to all addresses of an
4108 * association if the spp_address field is empty. Note
4109 * also, that if delayed sack is enabled and this
4110 * value is set to 0, no change is made to the last
4111 * recorded delayed sack timer value.
4113 * spp_flags - These flags are used to control various features
4114 * on an association. The flag field may contain
4115 * zero or more of the following options.
4117 * SPP_HB_ENABLE - Enable heartbeats on the
4118 * specified address. Note that if the address
4119 * field is empty all addresses for the association
4120 * have heartbeats enabled upon them.
4122 * SPP_HB_DISABLE - Disable heartbeats on the
4123 * speicifed address. Note that if the address
4124 * field is empty all addresses for the association
4125 * will have their heartbeats disabled. Note also
4126 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4127 * mutually exclusive, only one of these two should
4128 * be specified. Enabling both fields will have
4129 * undetermined results.
4131 * SPP_HB_DEMAND - Request a user initiated heartbeat
4132 * to be made immediately.
4134 * SPP_PMTUD_ENABLE - This field will enable PMTU
4135 * discovery upon the specified address. Note that
4136 * if the address feild is empty then all addresses
4137 * on the association are effected.
4139 * SPP_PMTUD_DISABLE - This field will disable PMTU
4140 * discovery upon the specified address. Note that
4141 * if the address feild is empty then all addresses
4142 * on the association are effected. Not also that
4143 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4144 * exclusive. Enabling both will have undetermined
4147 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4148 * on delayed sack. The time specified in spp_sackdelay
4149 * is used to specify the sack delay for this address. Note
4150 * that if spp_address is empty then all addresses will
4151 * enable delayed sack and take on the sack delay
4152 * value specified in spp_sackdelay.
4153 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4154 * off delayed sack. If the spp_address field is blank then
4155 * delayed sack is disabled for the entire association. Note
4156 * also that this field is mutually exclusive to
4157 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4160 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4161 char __user *optval, int __user *optlen)
4163 struct sctp_paddrparams params;
4164 struct sctp_transport *trans = NULL;
4165 struct sctp_association *asoc = NULL;
4166 struct sctp_sock *sp = sctp_sk(sk);
4168 if (len < sizeof(struct sctp_paddrparams))
4170 len = sizeof(struct sctp_paddrparams);
4171 if (copy_from_user(¶ms, optval, len))
4174 /* If an address other than INADDR_ANY is specified, and
4175 * no transport is found, then the request is invalid.
4177 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4178 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4179 params.spp_assoc_id);
4181 SCTP_DEBUG_PRINTK("Failed no transport\n");
4186 /* Get association, if assoc_id != 0 and the socket is a one
4187 * to many style socket, and an association was not found, then
4188 * the id was invalid.
4190 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4191 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4192 SCTP_DEBUG_PRINTK("Failed no association\n");
4197 /* Fetch transport values. */
4198 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4199 params.spp_pathmtu = trans->pathmtu;
4200 params.spp_pathmaxrxt = trans->pathmaxrxt;
4201 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4203 /*draft-11 doesn't say what to return in spp_flags*/
4204 params.spp_flags = trans->param_flags;
4206 /* Fetch association values. */
4207 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4208 params.spp_pathmtu = asoc->pathmtu;
4209 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4210 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4212 /*draft-11 doesn't say what to return in spp_flags*/
4213 params.spp_flags = asoc->param_flags;
4215 /* Fetch socket values. */
4216 params.spp_hbinterval = sp->hbinterval;
4217 params.spp_pathmtu = sp->pathmtu;
4218 params.spp_sackdelay = sp->sackdelay;
4219 params.spp_pathmaxrxt = sp->pathmaxrxt;
4221 /*draft-11 doesn't say what to return in spp_flags*/
4222 params.spp_flags = sp->param_flags;
4225 if (copy_to_user(optval, ¶ms, len))
4228 if (put_user(len, optlen))
4235 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4237 * This option will effect the way delayed acks are performed. This
4238 * option allows you to get or set the delayed ack time, in
4239 * milliseconds. It also allows changing the delayed ack frequency.
4240 * Changing the frequency to 1 disables the delayed sack algorithm. If
4241 * the assoc_id is 0, then this sets or gets the endpoints default
4242 * values. If the assoc_id field is non-zero, then the set or get
4243 * effects the specified association for the one to many model (the
4244 * assoc_id field is ignored by the one to one model). Note that if
4245 * sack_delay or sack_freq are 0 when setting this option, then the
4246 * current values will remain unchanged.
4248 * struct sctp_sack_info {
4249 * sctp_assoc_t sack_assoc_id;
4250 * uint32_t sack_delay;
4251 * uint32_t sack_freq;
4254 * sack_assoc_id - This parameter, indicates which association the user
4255 * is performing an action upon. Note that if this field's value is
4256 * zero then the endpoints default value is changed (effecting future
4257 * associations only).
4259 * sack_delay - This parameter contains the number of milliseconds that
4260 * the user is requesting the delayed ACK timer be set to. Note that
4261 * this value is defined in the standard to be between 200 and 500
4264 * sack_freq - This parameter contains the number of packets that must
4265 * be received before a sack is sent without waiting for the delay
4266 * timer to expire. The default value for this is 2, setting this
4267 * value to 1 will disable the delayed sack algorithm.
4269 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4270 char __user *optval,
4273 struct sctp_sack_info params;
4274 struct sctp_association *asoc = NULL;
4275 struct sctp_sock *sp = sctp_sk(sk);
4277 if (len >= sizeof(struct sctp_sack_info)) {
4278 len = sizeof(struct sctp_sack_info);
4280 if (copy_from_user(¶ms, optval, len))
4282 } else if (len == sizeof(struct sctp_assoc_value)) {
4283 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
4284 "in delayed_ack socket option deprecated\n");
4285 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
4286 if (copy_from_user(¶ms, optval, len))
4291 /* Get association, if sack_assoc_id != 0 and the socket is a one
4292 * to many style socket, and an association was not found, then
4293 * the id was invalid.
4295 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4296 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4300 /* Fetch association values. */
4301 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4302 params.sack_delay = jiffies_to_msecs(
4304 params.sack_freq = asoc->sackfreq;
4307 params.sack_delay = 0;
4308 params.sack_freq = 1;
4311 /* Fetch socket values. */
4312 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4313 params.sack_delay = sp->sackdelay;
4314 params.sack_freq = sp->sackfreq;
4316 params.sack_delay = 0;
4317 params.sack_freq = 1;
4321 if (copy_to_user(optval, ¶ms, len))
4324 if (put_user(len, optlen))
4330 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4332 * Applications can specify protocol parameters for the default association
4333 * initialization. The option name argument to setsockopt() and getsockopt()
4336 * Setting initialization parameters is effective only on an unconnected
4337 * socket (for UDP-style sockets only future associations are effected
4338 * by the change). With TCP-style sockets, this option is inherited by
4339 * sockets derived from a listener socket.
4341 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4343 if (len < sizeof(struct sctp_initmsg))
4345 len = sizeof(struct sctp_initmsg);
4346 if (put_user(len, optlen))
4348 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4354 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4355 char __user *optval, int __user *optlen)
4357 struct sctp_association *asoc;
4359 struct sctp_getaddrs getaddrs;
4360 struct sctp_transport *from;
4362 union sctp_addr temp;
4363 struct sctp_sock *sp = sctp_sk(sk);
4368 if (len < sizeof(struct sctp_getaddrs))
4371 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4374 /* For UDP-style sockets, id specifies the association to query. */
4375 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4379 to = optval + offsetof(struct sctp_getaddrs,addrs);
4380 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4382 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4384 memcpy(&temp, &from->ipaddr, sizeof(temp));
4385 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4386 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4387 if (space_left < addrlen)
4389 if (copy_to_user(to, &temp, addrlen))
4393 space_left -= addrlen;
4396 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4398 bytes_copied = ((char __user *)to) - optval;
4399 if (put_user(bytes_copied, optlen))
4405 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4406 size_t space_left, int *bytes_copied)
4408 struct sctp_sockaddr_entry *addr;
4409 union sctp_addr temp;
4414 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4418 if ((PF_INET == sk->sk_family) &&
4419 (AF_INET6 == addr->a.sa.sa_family))
4421 if ((PF_INET6 == sk->sk_family) &&
4422 inet_v6_ipv6only(sk) &&
4423 (AF_INET == addr->a.sa.sa_family))
4425 memcpy(&temp, &addr->a, sizeof(temp));
4426 if (!temp.v4.sin_port)
4427 temp.v4.sin_port = htons(port);
4429 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4431 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4432 if (space_left < addrlen) {
4436 memcpy(to, &temp, addrlen);
4440 space_left -= addrlen;
4441 *bytes_copied += addrlen;
4449 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4450 char __user *optval, int __user *optlen)
4452 struct sctp_bind_addr *bp;
4453 struct sctp_association *asoc;
4455 struct sctp_getaddrs getaddrs;
4456 struct sctp_sockaddr_entry *addr;
4458 union sctp_addr temp;
4459 struct sctp_sock *sp = sctp_sk(sk);
4463 int bytes_copied = 0;
4467 if (len < sizeof(struct sctp_getaddrs))
4470 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4474 * For UDP-style sockets, id specifies the association to query.
4475 * If the id field is set to the value '0' then the locally bound
4476 * addresses are returned without regard to any particular
4479 if (0 == getaddrs.assoc_id) {
4480 bp = &sctp_sk(sk)->ep->base.bind_addr;
4482 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4485 bp = &asoc->base.bind_addr;
4488 to = optval + offsetof(struct sctp_getaddrs,addrs);
4489 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4491 addrs = kmalloc(space_left, GFP_KERNEL);
4495 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4496 * addresses from the global local address list.
4498 if (sctp_list_single_entry(&bp->address_list)) {
4499 addr = list_entry(bp->address_list.next,
4500 struct sctp_sockaddr_entry, list);
4501 if (sctp_is_any(sk, &addr->a)) {
4502 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4503 space_left, &bytes_copied);
4513 /* Protection on the bound address list is not needed since
4514 * in the socket option context we hold a socket lock and
4515 * thus the bound address list can't change.
4517 list_for_each_entry(addr, &bp->address_list, list) {
4518 memcpy(&temp, &addr->a, sizeof(temp));
4519 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4520 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4521 if (space_left < addrlen) {
4522 err = -ENOMEM; /*fixme: right error?*/
4525 memcpy(buf, &temp, addrlen);
4527 bytes_copied += addrlen;
4529 space_left -= addrlen;
4533 if (copy_to_user(to, addrs, bytes_copied)) {
4537 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4541 if (put_user(bytes_copied, optlen))
4548 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4550 * Requests that the local SCTP stack use the enclosed peer address as
4551 * the association primary. The enclosed address must be one of the
4552 * association peer's addresses.
4554 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4555 char __user *optval, int __user *optlen)
4557 struct sctp_prim prim;
4558 struct sctp_association *asoc;
4559 struct sctp_sock *sp = sctp_sk(sk);
4561 if (len < sizeof(struct sctp_prim))
4564 len = sizeof(struct sctp_prim);
4566 if (copy_from_user(&prim, optval, len))
4569 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4573 if (!asoc->peer.primary_path)
4576 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4577 asoc->peer.primary_path->af_specific->sockaddr_len);
4579 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4580 (union sctp_addr *)&prim.ssp_addr);
4582 if (put_user(len, optlen))
4584 if (copy_to_user(optval, &prim, len))
4591 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4593 * Requests that the local endpoint set the specified Adaptation Layer
4594 * Indication parameter for all future INIT and INIT-ACK exchanges.
4596 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4597 char __user *optval, int __user *optlen)
4599 struct sctp_setadaptation adaptation;
4601 if (len < sizeof(struct sctp_setadaptation))
4604 len = sizeof(struct sctp_setadaptation);
4606 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4608 if (put_user(len, optlen))
4610 if (copy_to_user(optval, &adaptation, len))
4618 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4620 * Applications that wish to use the sendto() system call may wish to
4621 * specify a default set of parameters that would normally be supplied
4622 * through the inclusion of ancillary data. This socket option allows
4623 * such an application to set the default sctp_sndrcvinfo structure.
4626 * The application that wishes to use this socket option simply passes
4627 * in to this call the sctp_sndrcvinfo structure defined in Section
4628 * 5.2.2) The input parameters accepted by this call include
4629 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4630 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4631 * to this call if the caller is using the UDP model.
4633 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4635 static int sctp_getsockopt_default_send_param(struct sock *sk,
4636 int len, char __user *optval,
4639 struct sctp_sndrcvinfo info;
4640 struct sctp_association *asoc;
4641 struct sctp_sock *sp = sctp_sk(sk);
4643 if (len < sizeof(struct sctp_sndrcvinfo))
4646 len = sizeof(struct sctp_sndrcvinfo);
4648 if (copy_from_user(&info, optval, len))
4651 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4652 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4656 info.sinfo_stream = asoc->default_stream;
4657 info.sinfo_flags = asoc->default_flags;
4658 info.sinfo_ppid = asoc->default_ppid;
4659 info.sinfo_context = asoc->default_context;
4660 info.sinfo_timetolive = asoc->default_timetolive;
4662 info.sinfo_stream = sp->default_stream;
4663 info.sinfo_flags = sp->default_flags;
4664 info.sinfo_ppid = sp->default_ppid;
4665 info.sinfo_context = sp->default_context;
4666 info.sinfo_timetolive = sp->default_timetolive;
4669 if (put_user(len, optlen))
4671 if (copy_to_user(optval, &info, len))
4679 * 7.1.5 SCTP_NODELAY
4681 * Turn on/off any Nagle-like algorithm. This means that packets are
4682 * generally sent as soon as possible and no unnecessary delays are
4683 * introduced, at the cost of more packets in the network. Expects an
4684 * integer boolean flag.
4687 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4688 char __user *optval, int __user *optlen)
4692 if (len < sizeof(int))
4696 val = (sctp_sk(sk)->nodelay == 1);
4697 if (put_user(len, optlen))
4699 if (copy_to_user(optval, &val, len))
4706 * 7.1.1 SCTP_RTOINFO
4708 * The protocol parameters used to initialize and bound retransmission
4709 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4710 * and modify these parameters.
4711 * All parameters are time values, in milliseconds. A value of 0, when
4712 * modifying the parameters, indicates that the current value should not
4716 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4717 char __user *optval,
4718 int __user *optlen) {
4719 struct sctp_rtoinfo rtoinfo;
4720 struct sctp_association *asoc;
4722 if (len < sizeof (struct sctp_rtoinfo))
4725 len = sizeof(struct sctp_rtoinfo);
4727 if (copy_from_user(&rtoinfo, optval, len))
4730 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4732 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4735 /* Values corresponding to the specific association. */
4737 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4738 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4739 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4741 /* Values corresponding to the endpoint. */
4742 struct sctp_sock *sp = sctp_sk(sk);
4744 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4745 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4746 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4749 if (put_user(len, optlen))
4752 if (copy_to_user(optval, &rtoinfo, len))
4760 * 7.1.2 SCTP_ASSOCINFO
4762 * This option is used to tune the maximum retransmission attempts
4763 * of the association.
4764 * Returns an error if the new association retransmission value is
4765 * greater than the sum of the retransmission value of the peer.
4766 * See [SCTP] for more information.
4769 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4770 char __user *optval,
4774 struct sctp_assocparams assocparams;
4775 struct sctp_association *asoc;
4776 struct list_head *pos;
4779 if (len < sizeof (struct sctp_assocparams))
4782 len = sizeof(struct sctp_assocparams);
4784 if (copy_from_user(&assocparams, optval, len))
4787 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4789 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4792 /* Values correspoinding to the specific association */
4794 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4795 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4796 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4797 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4799 (asoc->cookie_life.tv_usec
4802 list_for_each(pos, &asoc->peer.transport_addr_list) {
4806 assocparams.sasoc_number_peer_destinations = cnt;
4808 /* Values corresponding to the endpoint */
4809 struct sctp_sock *sp = sctp_sk(sk);
4811 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
4812 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
4813 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
4814 assocparams.sasoc_cookie_life =
4815 sp->assocparams.sasoc_cookie_life;
4816 assocparams.sasoc_number_peer_destinations =
4818 sasoc_number_peer_destinations;
4821 if (put_user(len, optlen))
4824 if (copy_to_user(optval, &assocparams, len))
4831 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4833 * This socket option is a boolean flag which turns on or off mapped V4
4834 * addresses. If this option is turned on and the socket is type
4835 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4836 * If this option is turned off, then no mapping will be done of V4
4837 * addresses and a user will receive both PF_INET6 and PF_INET type
4838 * addresses on the socket.
4840 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
4841 char __user *optval, int __user *optlen)
4844 struct sctp_sock *sp = sctp_sk(sk);
4846 if (len < sizeof(int))
4851 if (put_user(len, optlen))
4853 if (copy_to_user(optval, &val, len))
4860 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4861 * (chapter and verse is quoted at sctp_setsockopt_context())
4863 static int sctp_getsockopt_context(struct sock *sk, int len,
4864 char __user *optval, int __user *optlen)
4866 struct sctp_assoc_value params;
4867 struct sctp_sock *sp;
4868 struct sctp_association *asoc;
4870 if (len < sizeof(struct sctp_assoc_value))
4873 len = sizeof(struct sctp_assoc_value);
4875 if (copy_from_user(¶ms, optval, len))
4880 if (params.assoc_id != 0) {
4881 asoc = sctp_id2assoc(sk, params.assoc_id);
4884 params.assoc_value = asoc->default_rcv_context;
4886 params.assoc_value = sp->default_rcv_context;
4889 if (put_user(len, optlen))
4891 if (copy_to_user(optval, ¶ms, len))
4898 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4899 * This option will get or set the maximum size to put in any outgoing
4900 * SCTP DATA chunk. If a message is larger than this size it will be
4901 * fragmented by SCTP into the specified size. Note that the underlying
4902 * SCTP implementation may fragment into smaller sized chunks when the
4903 * PMTU of the underlying association is smaller than the value set by
4904 * the user. The default value for this option is '0' which indicates
4905 * the user is NOT limiting fragmentation and only the PMTU will effect
4906 * SCTP's choice of DATA chunk size. Note also that values set larger
4907 * than the maximum size of an IP datagram will effectively let SCTP
4908 * control fragmentation (i.e. the same as setting this option to 0).
4910 * The following structure is used to access and modify this parameter:
4912 * struct sctp_assoc_value {
4913 * sctp_assoc_t assoc_id;
4914 * uint32_t assoc_value;
4917 * assoc_id: This parameter is ignored for one-to-one style sockets.
4918 * For one-to-many style sockets this parameter indicates which
4919 * association the user is performing an action upon. Note that if
4920 * this field's value is zero then the endpoints default value is
4921 * changed (effecting future associations only).
4922 * assoc_value: This parameter specifies the maximum size in bytes.
4924 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
4925 char __user *optval, int __user *optlen)
4927 struct sctp_assoc_value params;
4928 struct sctp_association *asoc;
4930 if (len == sizeof(int)) {
4932 "SCTP: Use of int in maxseg socket option deprecated\n");
4934 "SCTP: Use struct sctp_assoc_value instead\n");
4935 params.assoc_id = 0;
4936 } else if (len >= sizeof(struct sctp_assoc_value)) {
4937 len = sizeof(struct sctp_assoc_value);
4938 if (copy_from_user(¶ms, optval, sizeof(params)))
4943 asoc = sctp_id2assoc(sk, params.assoc_id);
4944 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
4948 params.assoc_value = asoc->frag_point;
4950 params.assoc_value = sctp_sk(sk)->user_frag;
4952 if (put_user(len, optlen))
4954 if (len == sizeof(int)) {
4955 if (copy_to_user(optval, ¶ms.assoc_value, len))
4958 if (copy_to_user(optval, ¶ms, len))
4966 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
4967 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
4969 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
4970 char __user *optval, int __user *optlen)
4974 if (len < sizeof(int))
4979 val = sctp_sk(sk)->frag_interleave;
4980 if (put_user(len, optlen))
4982 if (copy_to_user(optval, &val, len))
4989 * 7.1.25. Set or Get the sctp partial delivery point
4990 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
4992 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
4993 char __user *optval,
4998 if (len < sizeof(u32))
5003 val = sctp_sk(sk)->pd_point;
5004 if (put_user(len, optlen))
5006 if (copy_to_user(optval, &val, len))
5013 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5014 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5016 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5017 char __user *optval,
5020 struct sctp_assoc_value params;
5021 struct sctp_sock *sp;
5022 struct sctp_association *asoc;
5024 if (len == sizeof(int)) {
5026 "SCTP: Use of int in max_burst socket option deprecated\n");
5028 "SCTP: Use struct sctp_assoc_value instead\n");
5029 params.assoc_id = 0;
5030 } else if (len >= sizeof(struct sctp_assoc_value)) {
5031 len = sizeof(struct sctp_assoc_value);
5032 if (copy_from_user(¶ms, optval, len))
5039 if (params.assoc_id != 0) {
5040 asoc = sctp_id2assoc(sk, params.assoc_id);
5043 params.assoc_value = asoc->max_burst;
5045 params.assoc_value = sp->max_burst;
5047 if (len == sizeof(int)) {
5048 if (copy_to_user(optval, ¶ms.assoc_value, len))
5051 if (copy_to_user(optval, ¶ms, len))
5059 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5060 char __user *optval, int __user *optlen)
5062 struct sctp_hmacalgo __user *p = (void __user *)optval;
5063 struct sctp_hmac_algo_param *hmacs;
5067 if (!sctp_auth_enable)
5070 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5071 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5073 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5076 len = sizeof(struct sctp_hmacalgo) + data_len;
5077 num_idents = data_len / sizeof(u16);
5079 if (put_user(len, optlen))
5081 if (put_user(num_idents, &p->shmac_num_idents))
5083 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5088 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5089 char __user *optval, int __user *optlen)
5091 struct sctp_authkeyid val;
5092 struct sctp_association *asoc;
5094 if (!sctp_auth_enable)
5097 if (len < sizeof(struct sctp_authkeyid))
5099 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5102 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5103 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5107 val.scact_keynumber = asoc->active_key_id;
5109 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5111 len = sizeof(struct sctp_authkeyid);
5112 if (put_user(len, optlen))
5114 if (copy_to_user(optval, &val, len))
5120 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5121 char __user *optval, int __user *optlen)
5123 struct sctp_authchunks __user *p = (void __user *)optval;
5124 struct sctp_authchunks val;
5125 struct sctp_association *asoc;
5126 struct sctp_chunks_param *ch;
5130 if (!sctp_auth_enable)
5133 if (len < sizeof(struct sctp_authchunks))
5136 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5139 to = p->gauth_chunks;
5140 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5144 ch = asoc->peer.peer_chunks;
5148 /* See if the user provided enough room for all the data */
5149 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5150 if (len < num_chunks)
5153 if (copy_to_user(to, ch->chunks, num_chunks))
5156 len = sizeof(struct sctp_authchunks) + num_chunks;
5157 if (put_user(len, optlen)) return -EFAULT;
5158 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5163 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5164 char __user *optval, int __user *optlen)
5166 struct sctp_authchunks __user *p = (void __user *)optval;
5167 struct sctp_authchunks val;
5168 struct sctp_association *asoc;
5169 struct sctp_chunks_param *ch;
5173 if (!sctp_auth_enable)
5176 if (len < sizeof(struct sctp_authchunks))
5179 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5182 to = p->gauth_chunks;
5183 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5184 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5188 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5190 ch = sctp_sk(sk)->ep->auth_chunk_list;
5195 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5196 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5199 if (copy_to_user(to, ch->chunks, num_chunks))
5202 len = sizeof(struct sctp_authchunks) + num_chunks;
5203 if (put_user(len, optlen))
5205 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5212 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5213 * This option gets the current number of associations that are attached
5214 * to a one-to-many style socket. The option value is an uint32_t.
5216 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5217 char __user *optval, int __user *optlen)
5219 struct sctp_sock *sp = sctp_sk(sk);
5220 struct sctp_association *asoc;
5223 if (sctp_style(sk, TCP))
5226 if (len < sizeof(u32))
5231 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5235 if (put_user(len, optlen))
5237 if (copy_to_user(optval, &val, len))
5243 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5244 char __user *optval, int __user *optlen)
5249 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5252 /* I can hardly begin to describe how wrong this is. This is
5253 * so broken as to be worse than useless. The API draft
5254 * REALLY is NOT helpful here... I am not convinced that the
5255 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5256 * are at all well-founded.
5258 if (level != SOL_SCTP) {
5259 struct sctp_af *af = sctp_sk(sk)->pf->af;
5261 retval = af->getsockopt(sk, level, optname, optval, optlen);
5265 if (get_user(len, optlen))
5272 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5274 case SCTP_DISABLE_FRAGMENTS:
5275 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5279 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5281 case SCTP_AUTOCLOSE:
5282 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5284 case SCTP_SOCKOPT_PEELOFF:
5285 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5287 case SCTP_PEER_ADDR_PARAMS:
5288 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5291 case SCTP_DELAYED_ACK:
5292 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5296 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5298 case SCTP_GET_PEER_ADDRS:
5299 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5302 case SCTP_GET_LOCAL_ADDRS:
5303 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5306 case SCTP_SOCKOPT_CONNECTX3:
5307 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5309 case SCTP_DEFAULT_SEND_PARAM:
5310 retval = sctp_getsockopt_default_send_param(sk, len,
5313 case SCTP_PRIMARY_ADDR:
5314 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5317 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5320 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5322 case SCTP_ASSOCINFO:
5323 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5325 case SCTP_I_WANT_MAPPED_V4_ADDR:
5326 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5329 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5331 case SCTP_GET_PEER_ADDR_INFO:
5332 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5335 case SCTP_ADAPTATION_LAYER:
5336 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5340 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5342 case SCTP_FRAGMENT_INTERLEAVE:
5343 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5346 case SCTP_PARTIAL_DELIVERY_POINT:
5347 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5350 case SCTP_MAX_BURST:
5351 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5354 case SCTP_AUTH_CHUNK:
5355 case SCTP_AUTH_DELETE_KEY:
5356 retval = -EOPNOTSUPP;
5358 case SCTP_HMAC_IDENT:
5359 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5361 case SCTP_AUTH_ACTIVE_KEY:
5362 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5364 case SCTP_PEER_AUTH_CHUNKS:
5365 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5368 case SCTP_LOCAL_AUTH_CHUNKS:
5369 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5372 case SCTP_GET_ASSOC_NUMBER:
5373 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5376 retval = -ENOPROTOOPT;
5380 sctp_release_sock(sk);
5384 static void sctp_hash(struct sock *sk)
5389 static void sctp_unhash(struct sock *sk)
5394 /* Check if port is acceptable. Possibly find first available port.
5396 * The port hash table (contained in the 'global' SCTP protocol storage
5397 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5398 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5399 * list (the list number is the port number hashed out, so as you
5400 * would expect from a hash function, all the ports in a given list have
5401 * such a number that hashes out to the same list number; you were
5402 * expecting that, right?); so each list has a set of ports, with a
5403 * link to the socket (struct sock) that uses it, the port number and
5404 * a fastreuse flag (FIXME: NPI ipg).
5406 static struct sctp_bind_bucket *sctp_bucket_create(
5407 struct sctp_bind_hashbucket *head, unsigned short snum);
5409 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5411 struct sctp_bind_hashbucket *head; /* hash list */
5412 struct sctp_bind_bucket *pp; /* hash list port iterator */
5413 struct hlist_node *node;
5414 unsigned short snum;
5417 snum = ntohs(addr->v4.sin_port);
5419 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5420 sctp_local_bh_disable();
5423 /* Search for an available port. */
5424 int low, high, remaining, index;
5427 inet_get_local_port_range(&low, &high);
5428 remaining = (high - low) + 1;
5429 rover = net_random() % remaining + low;
5433 if ((rover < low) || (rover > high))
5435 index = sctp_phashfn(rover);
5436 head = &sctp_port_hashtable[index];
5437 sctp_spin_lock(&head->lock);
5438 sctp_for_each_hentry(pp, node, &head->chain)
5439 if (pp->port == rover)
5443 sctp_spin_unlock(&head->lock);
5444 } while (--remaining > 0);
5446 /* Exhausted local port range during search? */
5451 /* OK, here is the one we will use. HEAD (the port
5452 * hash table list entry) is non-NULL and we hold it's
5457 /* We are given an specific port number; we verify
5458 * that it is not being used. If it is used, we will
5459 * exahust the search in the hash list corresponding
5460 * to the port number (snum) - we detect that with the
5461 * port iterator, pp being NULL.
5463 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5464 sctp_spin_lock(&head->lock);
5465 sctp_for_each_hentry(pp, node, &head->chain) {
5466 if (pp->port == snum)
5473 if (!hlist_empty(&pp->owner)) {
5474 /* We had a port hash table hit - there is an
5475 * available port (pp != NULL) and it is being
5476 * used by other socket (pp->owner not empty); that other
5477 * socket is going to be sk2.
5479 int reuse = sk->sk_reuse;
5481 struct hlist_node *node;
5483 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5484 if (pp->fastreuse && sk->sk_reuse &&
5485 sk->sk_state != SCTP_SS_LISTENING)
5488 /* Run through the list of sockets bound to the port
5489 * (pp->port) [via the pointers bind_next and
5490 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5491 * we get the endpoint they describe and run through
5492 * the endpoint's list of IP (v4 or v6) addresses,
5493 * comparing each of the addresses with the address of
5494 * the socket sk. If we find a match, then that means
5495 * that this port/socket (sk) combination are already
5498 sk_for_each_bound(sk2, node, &pp->owner) {
5499 struct sctp_endpoint *ep2;
5500 ep2 = sctp_sk(sk2)->ep;
5503 (reuse && sk2->sk_reuse &&
5504 sk2->sk_state != SCTP_SS_LISTENING))
5507 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5508 sctp_sk(sk2), sctp_sk(sk))) {
5513 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5516 /* If there was a hash table miss, create a new port. */
5518 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5521 /* In either case (hit or miss), make sure fastreuse is 1 only
5522 * if sk->sk_reuse is too (that is, if the caller requested
5523 * SO_REUSEADDR on this socket -sk-).
5525 if (hlist_empty(&pp->owner)) {
5526 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5530 } else if (pp->fastreuse &&
5531 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5534 /* We are set, so fill up all the data in the hash table
5535 * entry, tie the socket list information with the rest of the
5536 * sockets FIXME: Blurry, NPI (ipg).
5539 if (!sctp_sk(sk)->bind_hash) {
5540 inet_sk(sk)->inet_num = snum;
5541 sk_add_bind_node(sk, &pp->owner);
5542 sctp_sk(sk)->bind_hash = pp;
5547 sctp_spin_unlock(&head->lock);
5550 sctp_local_bh_enable();
5554 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5555 * port is requested.
5557 static int sctp_get_port(struct sock *sk, unsigned short snum)
5560 union sctp_addr addr;
5561 struct sctp_af *af = sctp_sk(sk)->pf->af;
5563 /* Set up a dummy address struct from the sk. */
5564 af->from_sk(&addr, sk);
5565 addr.v4.sin_port = htons(snum);
5567 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5568 ret = sctp_get_port_local(sk, &addr);
5570 return (ret ? 1 : 0);
5574 * Move a socket to LISTENING state.
5576 SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
5578 struct sctp_sock *sp = sctp_sk(sk);
5579 struct sctp_endpoint *ep = sp->ep;
5580 struct crypto_hash *tfm = NULL;
5582 /* Allocate HMAC for generating cookie. */
5583 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5584 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5586 if (net_ratelimit()) {
5588 "SCTP: failed to load transform for %s: %ld\n",
5589 sctp_hmac_alg, PTR_ERR(tfm));
5593 sctp_sk(sk)->hmac = tfm;
5597 * If a bind() or sctp_bindx() is not called prior to a listen()
5598 * call that allows new associations to be accepted, the system
5599 * picks an ephemeral port and will choose an address set equivalent
5600 * to binding with a wildcard address.
5602 * This is not currently spelled out in the SCTP sockets
5603 * extensions draft, but follows the practice as seen in TCP
5607 sk->sk_state = SCTP_SS_LISTENING;
5608 if (!ep->base.bind_addr.port) {
5609 if (sctp_autobind(sk))
5612 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
5613 sk->sk_state = SCTP_SS_CLOSED;
5618 sk->sk_max_ack_backlog = backlog;
5619 sctp_hash_endpoint(ep);
5624 * 4.1.3 / 5.1.3 listen()
5626 * By default, new associations are not accepted for UDP style sockets.
5627 * An application uses listen() to mark a socket as being able to
5628 * accept new associations.
5630 * On TCP style sockets, applications use listen() to ready the SCTP
5631 * endpoint for accepting inbound associations.
5633 * On both types of endpoints a backlog of '0' disables listening.
5635 * Move a socket to LISTENING state.
5637 int sctp_inet_listen(struct socket *sock, int backlog)
5639 struct sock *sk = sock->sk;
5640 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5643 if (unlikely(backlog < 0))
5648 /* Peeled-off sockets are not allowed to listen(). */
5649 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
5652 if (sock->state != SS_UNCONNECTED)
5655 /* If backlog is zero, disable listening. */
5657 if (sctp_sstate(sk, CLOSED))
5661 sctp_unhash_endpoint(ep);
5662 sk->sk_state = SCTP_SS_CLOSED;
5664 sctp_sk(sk)->bind_hash->fastreuse = 1;
5668 /* If we are already listening, just update the backlog */
5669 if (sctp_sstate(sk, LISTENING))
5670 sk->sk_max_ack_backlog = backlog;
5672 err = sctp_listen_start(sk, backlog);
5679 sctp_release_sock(sk);
5684 * This function is done by modeling the current datagram_poll() and the
5685 * tcp_poll(). Note that, based on these implementations, we don't
5686 * lock the socket in this function, even though it seems that,
5687 * ideally, locking or some other mechanisms can be used to ensure
5688 * the integrity of the counters (sndbuf and wmem_alloc) used
5689 * in this place. We assume that we don't need locks either until proven
5692 * Another thing to note is that we include the Async I/O support
5693 * here, again, by modeling the current TCP/UDP code. We don't have
5694 * a good way to test with it yet.
5696 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5698 struct sock *sk = sock->sk;
5699 struct sctp_sock *sp = sctp_sk(sk);
5702 poll_wait(file, sk->sk_sleep, wait);
5704 /* A TCP-style listening socket becomes readable when the accept queue
5707 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5708 return (!list_empty(&sp->ep->asocs)) ?
5709 (POLLIN | POLLRDNORM) : 0;
5713 /* Is there any exceptional events? */
5714 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5716 if (sk->sk_shutdown & RCV_SHUTDOWN)
5718 if (sk->sk_shutdown == SHUTDOWN_MASK)
5721 /* Is it readable? Reconsider this code with TCP-style support. */
5722 if (!skb_queue_empty(&sk->sk_receive_queue) ||
5723 (sk->sk_shutdown & RCV_SHUTDOWN))
5724 mask |= POLLIN | POLLRDNORM;
5726 /* The association is either gone or not ready. */
5727 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5730 /* Is it writable? */
5731 if (sctp_writeable(sk)) {
5732 mask |= POLLOUT | POLLWRNORM;
5734 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5736 * Since the socket is not locked, the buffer
5737 * might be made available after the writeable check and
5738 * before the bit is set. This could cause a lost I/O
5739 * signal. tcp_poll() has a race breaker for this race
5740 * condition. Based on their implementation, we put
5741 * in the following code to cover it as well.
5743 if (sctp_writeable(sk))
5744 mask |= POLLOUT | POLLWRNORM;
5749 /********************************************************************
5750 * 2nd Level Abstractions
5751 ********************************************************************/
5753 static struct sctp_bind_bucket *sctp_bucket_create(
5754 struct sctp_bind_hashbucket *head, unsigned short snum)
5756 struct sctp_bind_bucket *pp;
5758 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
5760 SCTP_DBG_OBJCNT_INC(bind_bucket);
5763 INIT_HLIST_HEAD(&pp->owner);
5764 hlist_add_head(&pp->node, &head->chain);
5769 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5770 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5772 if (pp && hlist_empty(&pp->owner)) {
5773 __hlist_del(&pp->node);
5774 kmem_cache_free(sctp_bucket_cachep, pp);
5775 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5779 /* Release this socket's reference to a local port. */
5780 static inline void __sctp_put_port(struct sock *sk)
5782 struct sctp_bind_hashbucket *head =
5783 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)];
5784 struct sctp_bind_bucket *pp;
5786 sctp_spin_lock(&head->lock);
5787 pp = sctp_sk(sk)->bind_hash;
5788 __sk_del_bind_node(sk);
5789 sctp_sk(sk)->bind_hash = NULL;
5790 inet_sk(sk)->inet_num = 0;
5791 sctp_bucket_destroy(pp);
5792 sctp_spin_unlock(&head->lock);
5795 void sctp_put_port(struct sock *sk)
5797 sctp_local_bh_disable();
5798 __sctp_put_port(sk);
5799 sctp_local_bh_enable();
5803 * The system picks an ephemeral port and choose an address set equivalent
5804 * to binding with a wildcard address.
5805 * One of those addresses will be the primary address for the association.
5806 * This automatically enables the multihoming capability of SCTP.
5808 static int sctp_autobind(struct sock *sk)
5810 union sctp_addr autoaddr;
5814 /* Initialize a local sockaddr structure to INADDR_ANY. */
5815 af = sctp_sk(sk)->pf->af;
5817 port = htons(inet_sk(sk)->inet_num);
5818 af->inaddr_any(&autoaddr, port);
5820 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
5823 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5826 * 4.2 The cmsghdr Structure *
5828 * When ancillary data is sent or received, any number of ancillary data
5829 * objects can be specified by the msg_control and msg_controllen members of
5830 * the msghdr structure, because each object is preceded by
5831 * a cmsghdr structure defining the object's length (the cmsg_len member).
5832 * Historically Berkeley-derived implementations have passed only one object
5833 * at a time, but this API allows multiple objects to be
5834 * passed in a single call to sendmsg() or recvmsg(). The following example
5835 * shows two ancillary data objects in a control buffer.
5837 * |<--------------------------- msg_controllen -------------------------->|
5840 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5842 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5845 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5847 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5850 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5851 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5853 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5855 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5862 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
5863 sctp_cmsgs_t *cmsgs)
5865 struct cmsghdr *cmsg;
5866 struct msghdr *my_msg = (struct msghdr *)msg;
5868 for (cmsg = CMSG_FIRSTHDR(msg);
5870 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
5871 if (!CMSG_OK(my_msg, cmsg))
5874 /* Should we parse this header or ignore? */
5875 if (cmsg->cmsg_level != IPPROTO_SCTP)
5878 /* Strictly check lengths following example in SCM code. */
5879 switch (cmsg->cmsg_type) {
5881 /* SCTP Socket API Extension
5882 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5884 * This cmsghdr structure provides information for
5885 * initializing new SCTP associations with sendmsg().
5886 * The SCTP_INITMSG socket option uses this same data
5887 * structure. This structure is not used for
5890 * cmsg_level cmsg_type cmsg_data[]
5891 * ------------ ------------ ----------------------
5892 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5894 if (cmsg->cmsg_len !=
5895 CMSG_LEN(sizeof(struct sctp_initmsg)))
5897 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
5901 /* SCTP Socket API Extension
5902 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5904 * This cmsghdr structure specifies SCTP options for
5905 * sendmsg() and describes SCTP header information
5906 * about a received message through recvmsg().
5908 * cmsg_level cmsg_type cmsg_data[]
5909 * ------------ ------------ ----------------------
5910 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
5912 if (cmsg->cmsg_len !=
5913 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
5917 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
5919 /* Minimally, validate the sinfo_flags. */
5920 if (cmsgs->info->sinfo_flags &
5921 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
5922 SCTP_ABORT | SCTP_EOF))
5934 * Wait for a packet..
5935 * Note: This function is the same function as in core/datagram.c
5936 * with a few modifications to make lksctp work.
5938 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
5943 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
5945 /* Socket errors? */
5946 error = sock_error(sk);
5950 if (!skb_queue_empty(&sk->sk_receive_queue))
5953 /* Socket shut down? */
5954 if (sk->sk_shutdown & RCV_SHUTDOWN)
5957 /* Sequenced packets can come disconnected. If so we report the
5962 /* Is there a good reason to think that we may receive some data? */
5963 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
5966 /* Handle signals. */
5967 if (signal_pending(current))
5970 /* Let another process have a go. Since we are going to sleep
5971 * anyway. Note: This may cause odd behaviors if the message
5972 * does not fit in the user's buffer, but this seems to be the
5973 * only way to honor MSG_DONTWAIT realistically.
5975 sctp_release_sock(sk);
5976 *timeo_p = schedule_timeout(*timeo_p);
5980 finish_wait(sk->sk_sleep, &wait);
5984 error = sock_intr_errno(*timeo_p);
5987 finish_wait(sk->sk_sleep, &wait);
5992 /* Receive a datagram.
5993 * Note: This is pretty much the same routine as in core/datagram.c
5994 * with a few changes to make lksctp work.
5996 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
5997 int noblock, int *err)
6000 struct sk_buff *skb;
6003 timeo = sock_rcvtimeo(sk, noblock);
6005 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6006 timeo, MAX_SCHEDULE_TIMEOUT);
6009 /* Again only user level code calls this function,
6010 * so nothing interrupt level
6011 * will suddenly eat the receive_queue.
6013 * Look at current nfs client by the way...
6014 * However, this function was corrent in any case. 8)
6016 if (flags & MSG_PEEK) {
6017 spin_lock_bh(&sk->sk_receive_queue.lock);
6018 skb = skb_peek(&sk->sk_receive_queue);
6020 atomic_inc(&skb->users);
6021 spin_unlock_bh(&sk->sk_receive_queue.lock);
6023 skb = skb_dequeue(&sk->sk_receive_queue);
6029 /* Caller is allowed not to check sk->sk_err before calling. */
6030 error = sock_error(sk);
6034 if (sk->sk_shutdown & RCV_SHUTDOWN)
6037 /* User doesn't want to wait. */
6041 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6050 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6051 static void __sctp_write_space(struct sctp_association *asoc)
6053 struct sock *sk = asoc->base.sk;
6054 struct socket *sock = sk->sk_socket;
6056 if ((sctp_wspace(asoc) > 0) && sock) {
6057 if (waitqueue_active(&asoc->wait))
6058 wake_up_interruptible(&asoc->wait);
6060 if (sctp_writeable(sk)) {
6061 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6062 wake_up_interruptible(sk->sk_sleep);
6064 /* Note that we try to include the Async I/O support
6065 * here by modeling from the current TCP/UDP code.
6066 * We have not tested with it yet.
6068 if (sock->fasync_list &&
6069 !(sk->sk_shutdown & SEND_SHUTDOWN))
6070 sock_wake_async(sock,
6071 SOCK_WAKE_SPACE, POLL_OUT);
6076 /* Do accounting for the sndbuf space.
6077 * Decrement the used sndbuf space of the corresponding association by the
6078 * data size which was just transmitted(freed).
6080 static void sctp_wfree(struct sk_buff *skb)
6082 struct sctp_association *asoc;
6083 struct sctp_chunk *chunk;
6086 /* Get the saved chunk pointer. */
6087 chunk = *((struct sctp_chunk **)(skb->cb));
6090 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6091 sizeof(struct sk_buff) +
6092 sizeof(struct sctp_chunk);
6094 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6097 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6099 sk->sk_wmem_queued -= skb->truesize;
6100 sk_mem_uncharge(sk, skb->truesize);
6103 __sctp_write_space(asoc);
6105 sctp_association_put(asoc);
6108 /* Do accounting for the receive space on the socket.
6109 * Accounting for the association is done in ulpevent.c
6110 * We set this as a destructor for the cloned data skbs so that
6111 * accounting is done at the correct time.
6113 void sctp_sock_rfree(struct sk_buff *skb)
6115 struct sock *sk = skb->sk;
6116 struct sctp_ulpevent *event = sctp_skb2event(skb);
6118 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6121 * Mimic the behavior of sock_rfree
6123 sk_mem_uncharge(sk, event->rmem_len);
6127 /* Helper function to wait for space in the sndbuf. */
6128 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6131 struct sock *sk = asoc->base.sk;
6133 long current_timeo = *timeo_p;
6136 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6137 asoc, (long)(*timeo_p), msg_len);
6139 /* Increment the association's refcnt. */
6140 sctp_association_hold(asoc);
6142 /* Wait on the association specific sndbuf space. */
6144 prepare_to_wait_exclusive(&asoc->wait, &wait,
6145 TASK_INTERRUPTIBLE);
6148 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6151 if (signal_pending(current))
6152 goto do_interrupted;
6153 if (msg_len <= sctp_wspace(asoc))
6156 /* Let another process have a go. Since we are going
6159 sctp_release_sock(sk);
6160 current_timeo = schedule_timeout(current_timeo);
6161 BUG_ON(sk != asoc->base.sk);
6164 *timeo_p = current_timeo;
6168 finish_wait(&asoc->wait, &wait);
6170 /* Release the association's refcnt. */
6171 sctp_association_put(asoc);
6180 err = sock_intr_errno(*timeo_p);
6188 /* If socket sndbuf has changed, wake up all per association waiters. */
6189 void sctp_write_space(struct sock *sk)
6191 struct sctp_association *asoc;
6193 /* Wake up the tasks in each wait queue. */
6194 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6195 __sctp_write_space(asoc);
6199 /* Is there any sndbuf space available on the socket?
6201 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6202 * associations on the same socket. For a UDP-style socket with
6203 * multiple associations, it is possible for it to be "unwriteable"
6204 * prematurely. I assume that this is acceptable because
6205 * a premature "unwriteable" is better than an accidental "writeable" which
6206 * would cause an unwanted block under certain circumstances. For the 1-1
6207 * UDP-style sockets or TCP-style sockets, this code should work.
6210 static int sctp_writeable(struct sock *sk)
6214 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
6220 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6221 * returns immediately with EINPROGRESS.
6223 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6225 struct sock *sk = asoc->base.sk;
6227 long current_timeo = *timeo_p;
6230 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6233 /* Increment the association's refcnt. */
6234 sctp_association_hold(asoc);
6237 prepare_to_wait_exclusive(&asoc->wait, &wait,
6238 TASK_INTERRUPTIBLE);
6241 if (sk->sk_shutdown & RCV_SHUTDOWN)
6243 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6246 if (signal_pending(current))
6247 goto do_interrupted;
6249 if (sctp_state(asoc, ESTABLISHED))
6252 /* Let another process have a go. Since we are going
6255 sctp_release_sock(sk);
6256 current_timeo = schedule_timeout(current_timeo);
6259 *timeo_p = current_timeo;
6263 finish_wait(&asoc->wait, &wait);
6265 /* Release the association's refcnt. */
6266 sctp_association_put(asoc);
6271 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6274 err = -ECONNREFUSED;
6278 err = sock_intr_errno(*timeo_p);
6286 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6288 struct sctp_endpoint *ep;
6292 ep = sctp_sk(sk)->ep;
6296 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
6297 TASK_INTERRUPTIBLE);
6299 if (list_empty(&ep->asocs)) {
6300 sctp_release_sock(sk);
6301 timeo = schedule_timeout(timeo);
6306 if (!sctp_sstate(sk, LISTENING))
6310 if (!list_empty(&ep->asocs))
6313 err = sock_intr_errno(timeo);
6314 if (signal_pending(current))
6322 finish_wait(sk->sk_sleep, &wait);
6327 static void sctp_wait_for_close(struct sock *sk, long timeout)
6332 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6333 if (list_empty(&sctp_sk(sk)->ep->asocs))
6335 sctp_release_sock(sk);
6336 timeout = schedule_timeout(timeout);
6338 } while (!signal_pending(current) && timeout);
6340 finish_wait(sk->sk_sleep, &wait);
6343 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6345 struct sk_buff *frag;
6350 /* Don't forget the fragments. */
6351 skb_walk_frags(skb, frag)
6352 sctp_skb_set_owner_r_frag(frag, sk);
6355 sctp_skb_set_owner_r(skb, sk);
6358 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6359 struct sctp_association *asoc)
6361 struct inet_sock *inet = inet_sk(sk);
6362 struct inet_sock *newinet;
6364 newsk->sk_type = sk->sk_type;
6365 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6366 newsk->sk_flags = sk->sk_flags;
6367 newsk->sk_no_check = sk->sk_no_check;
6368 newsk->sk_reuse = sk->sk_reuse;
6370 newsk->sk_shutdown = sk->sk_shutdown;
6371 newsk->sk_destruct = inet_sock_destruct;
6372 newsk->sk_family = sk->sk_family;
6373 newsk->sk_protocol = IPPROTO_SCTP;
6374 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6375 newsk->sk_sndbuf = sk->sk_sndbuf;
6376 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6377 newsk->sk_lingertime = sk->sk_lingertime;
6378 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6379 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6381 newinet = inet_sk(newsk);
6383 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6384 * getsockname() and getpeername()
6386 newinet->inet_sport = inet->inet_sport;
6387 newinet->inet_saddr = inet->inet_saddr;
6388 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6389 newinet->inet_dport = htons(asoc->peer.port);
6390 newinet->pmtudisc = inet->pmtudisc;
6391 newinet->inet_id = asoc->next_tsn ^ jiffies;
6393 newinet->uc_ttl = inet->uc_ttl;
6394 newinet->mc_loop = 1;
6395 newinet->mc_ttl = 1;
6396 newinet->mc_index = 0;
6397 newinet->mc_list = NULL;
6400 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6401 * and its messages to the newsk.
6403 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6404 struct sctp_association *assoc,
6405 sctp_socket_type_t type)
6407 struct sctp_sock *oldsp = sctp_sk(oldsk);
6408 struct sctp_sock *newsp = sctp_sk(newsk);
6409 struct sctp_bind_bucket *pp; /* hash list port iterator */
6410 struct sctp_endpoint *newep = newsp->ep;
6411 struct sk_buff *skb, *tmp;
6412 struct sctp_ulpevent *event;
6413 struct sctp_bind_hashbucket *head;
6415 /* Migrate socket buffer sizes and all the socket level options to the
6418 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6419 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6420 /* Brute force copy old sctp opt. */
6421 inet_sk_copy_descendant(newsk, oldsk);
6423 /* Restore the ep value that was overwritten with the above structure
6429 /* Hook this new socket in to the bind_hash list. */
6430 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)];
6431 sctp_local_bh_disable();
6432 sctp_spin_lock(&head->lock);
6433 pp = sctp_sk(oldsk)->bind_hash;
6434 sk_add_bind_node(newsk, &pp->owner);
6435 sctp_sk(newsk)->bind_hash = pp;
6436 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
6437 sctp_spin_unlock(&head->lock);
6438 sctp_local_bh_enable();
6440 /* Copy the bind_addr list from the original endpoint to the new
6441 * endpoint so that we can handle restarts properly
6443 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6444 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6446 /* Move any messages in the old socket's receive queue that are for the
6447 * peeled off association to the new socket's receive queue.
6449 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6450 event = sctp_skb2event(skb);
6451 if (event->asoc == assoc) {
6452 __skb_unlink(skb, &oldsk->sk_receive_queue);
6453 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6454 sctp_skb_set_owner_r_frag(skb, newsk);
6458 /* Clean up any messages pending delivery due to partial
6459 * delivery. Three cases:
6460 * 1) No partial deliver; no work.
6461 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6462 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6464 skb_queue_head_init(&newsp->pd_lobby);
6465 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6467 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6468 struct sk_buff_head *queue;
6470 /* Decide which queue to move pd_lobby skbs to. */
6471 if (assoc->ulpq.pd_mode) {
6472 queue = &newsp->pd_lobby;
6474 queue = &newsk->sk_receive_queue;
6476 /* Walk through the pd_lobby, looking for skbs that
6477 * need moved to the new socket.
6479 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6480 event = sctp_skb2event(skb);
6481 if (event->asoc == assoc) {
6482 __skb_unlink(skb, &oldsp->pd_lobby);
6483 __skb_queue_tail(queue, skb);
6484 sctp_skb_set_owner_r_frag(skb, newsk);
6488 /* Clear up any skbs waiting for the partial
6489 * delivery to finish.
6491 if (assoc->ulpq.pd_mode)
6492 sctp_clear_pd(oldsk, NULL);
6496 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
6497 sctp_skb_set_owner_r_frag(skb, newsk);
6499 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
6500 sctp_skb_set_owner_r_frag(skb, newsk);
6502 /* Set the type of socket to indicate that it is peeled off from the
6503 * original UDP-style socket or created with the accept() call on a
6504 * TCP-style socket..
6508 /* Mark the new socket "in-use" by the user so that any packets
6509 * that may arrive on the association after we've moved it are
6510 * queued to the backlog. This prevents a potential race between
6511 * backlog processing on the old socket and new-packet processing
6512 * on the new socket.
6514 * The caller has just allocated newsk so we can guarantee that other
6515 * paths won't try to lock it and then oldsk.
6517 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6518 sctp_assoc_migrate(assoc, newsk);
6520 /* If the association on the newsk is already closed before accept()
6521 * is called, set RCV_SHUTDOWN flag.
6523 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6524 newsk->sk_shutdown |= RCV_SHUTDOWN;
6526 newsk->sk_state = SCTP_SS_ESTABLISHED;
6527 sctp_release_sock(newsk);
6531 /* This proto struct describes the ULP interface for SCTP. */
6532 struct proto sctp_prot = {
6534 .owner = THIS_MODULE,
6535 .close = sctp_close,
6536 .connect = sctp_connect,
6537 .disconnect = sctp_disconnect,
6538 .accept = sctp_accept,
6539 .ioctl = sctp_ioctl,
6540 .init = sctp_init_sock,
6541 .destroy = sctp_destroy_sock,
6542 .shutdown = sctp_shutdown,
6543 .setsockopt = sctp_setsockopt,
6544 .getsockopt = sctp_getsockopt,
6545 .sendmsg = sctp_sendmsg,
6546 .recvmsg = sctp_recvmsg,
6548 .backlog_rcv = sctp_backlog_rcv,
6550 .unhash = sctp_unhash,
6551 .get_port = sctp_get_port,
6552 .obj_size = sizeof(struct sctp_sock),
6553 .sysctl_mem = sysctl_sctp_mem,
6554 .sysctl_rmem = sysctl_sctp_rmem,
6555 .sysctl_wmem = sysctl_sctp_wmem,
6556 .memory_pressure = &sctp_memory_pressure,
6557 .enter_memory_pressure = sctp_enter_memory_pressure,
6558 .memory_allocated = &sctp_memory_allocated,
6559 .sockets_allocated = &sctp_sockets_allocated,
6562 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6564 struct proto sctpv6_prot = {
6566 .owner = THIS_MODULE,
6567 .close = sctp_close,
6568 .connect = sctp_connect,
6569 .disconnect = sctp_disconnect,
6570 .accept = sctp_accept,
6571 .ioctl = sctp_ioctl,
6572 .init = sctp_init_sock,
6573 .destroy = sctp_destroy_sock,
6574 .shutdown = sctp_shutdown,
6575 .setsockopt = sctp_setsockopt,
6576 .getsockopt = sctp_getsockopt,
6577 .sendmsg = sctp_sendmsg,
6578 .recvmsg = sctp_recvmsg,
6580 .backlog_rcv = sctp_backlog_rcv,
6582 .unhash = sctp_unhash,
6583 .get_port = sctp_get_port,
6584 .obj_size = sizeof(struct sctp6_sock),
6585 .sysctl_mem = sysctl_sctp_mem,
6586 .sysctl_rmem = sysctl_sctp_rmem,
6587 .sysctl_wmem = sysctl_sctp_wmem,
6588 .memory_pressure = &sctp_memory_pressure,
6589 .enter_memory_pressure = sctp_enter_memory_pressure,
6590 .memory_allocated = &sctp_memory_allocated,
6591 .sockets_allocated = &sctp_sockets_allocated,
6593 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */