1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2003 Intel Corp.
6 * Copyright (c) 2001-2002 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
9 * This file is part of the SCTP kernel implementation
11 * These functions interface with the sockets layer to implement the
12 * SCTP Extensions for the Sockets API.
14 * Note that the descriptions from the specification are USER level
15 * functions--this file is the functions which populate the struct proto
16 * for SCTP which is the BOTTOM of the sockets interface.
18 * This SCTP implementation is free software;
19 * you can redistribute it and/or modify it under the terms of
20 * the GNU General Public License as published by
21 * the Free Software Foundation; either version 2, or (at your option)
24 * This SCTP implementation is distributed in the hope that it
25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
26 * ************************
27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
28 * See the GNU General Public License for more details.
30 * You should have received a copy of the GNU General Public License
31 * along with GNU CC; see the file COPYING. If not, write to
32 * the Free Software Foundation, 59 Temple Place - Suite 330,
33 * Boston, MA 02111-1307, USA.
35 * Please send any bug reports or fixes you make to the
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
73 #include <net/route.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock *sk);
89 static void sctp_wfree(struct sk_buff *skb);
90 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
92 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
93 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
94 static int sctp_wait_for_accept(struct sock *sk, long timeo);
95 static void sctp_wait_for_close(struct sock *sk, long timeo);
96 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
97 union sctp_addr *addr, int len);
98 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
99 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
102 static int sctp_send_asconf(struct sctp_association *asoc,
103 struct sctp_chunk *chunk);
104 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
105 static int sctp_autobind(struct sock *sk);
106 static void sctp_sock_migrate(struct sock *, struct sock *,
107 struct sctp_association *, sctp_socket_type_t);
108 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
110 extern struct kmem_cache *sctp_bucket_cachep;
111 extern int sysctl_sctp_mem[3];
112 extern int sysctl_sctp_rmem[3];
113 extern int sysctl_sctp_wmem[3];
115 static int sctp_memory_pressure;
116 static atomic_t sctp_memory_allocated;
117 static atomic_t sctp_sockets_allocated;
119 static void sctp_enter_memory_pressure(struct sock *sk)
121 sctp_memory_pressure = 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association *asoc)
130 if (asoc->ep->sndbuf_policy)
131 amt = asoc->sndbuf_used;
133 amt = atomic_read(&asoc->base.sk->sk_wmem_alloc);
135 if (amt >= asoc->base.sk->sk_sndbuf) {
136 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
139 amt = sk_stream_wspace(asoc->base.sk);
144 amt = asoc->base.sk->sk_sndbuf - amt;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
158 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
160 struct sctp_association *asoc = chunk->asoc;
161 struct sock *sk = asoc->base.sk;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc);
166 skb_set_owner_w(chunk->skb, sk);
168 chunk->skb->destructor = sctp_wfree;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
172 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
173 sizeof(struct sk_buff) +
174 sizeof(struct sctp_chunk);
176 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
177 sk->sk_wmem_queued += chunk->skb->truesize;
178 sk_mem_charge(sk, chunk->skb->truesize);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
187 /* Verify basic sockaddr. */
188 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
192 /* Is this a valid SCTP address? */
193 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
196 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
207 struct sctp_association *asoc = NULL;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk, UDP)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk, ESTABLISHED))
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk)->ep->asocs))
220 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
221 struct sctp_association, asocs);
225 /* Otherwise this is a UDP-style socket. */
226 if (!id || (id == (sctp_assoc_t)-1))
229 spin_lock_bh(&sctp_assocs_id_lock);
230 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
231 spin_unlock_bh(&sctp_assocs_id_lock);
233 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
243 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
244 struct sockaddr_storage *addr,
247 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
248 struct sctp_transport *transport;
249 union sctp_addr *laddr = (union sctp_addr *)addr;
251 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
258 id_asoc = sctp_id2assoc(sk, id);
259 if (id_asoc && (id_asoc != addr_asoc))
262 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
263 (union sctp_addr *)addr);
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk)->ep->base.bind_addr.port)
289 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
294 sctp_release_sock(sk);
299 static long sctp_get_port_local(struct sock *, union sctp_addr *);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
303 union sctp_addr *addr, int len)
307 /* Check minimum size. */
308 if (len < sizeof (struct sockaddr))
311 /* V4 mapped address are really of AF_INET family */
312 if (addr->sa.sa_family == AF_INET6 &&
313 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
314 if (!opt->pf->af_supported(AF_INET, opt))
317 /* Does this PF support this AF? */
318 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
322 /* If we get this far, af is valid. */
323 af = sctp_get_af_specific(addr->sa.sa_family);
325 if (len < af->sockaddr_len)
331 /* Bind a local address either to an endpoint or to an association. */
332 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
334 struct sctp_sock *sp = sctp_sk(sk);
335 struct sctp_endpoint *ep = sp->ep;
336 struct sctp_bind_addr *bp = &ep->base.bind_addr;
341 /* Common sockaddr verification. */
342 af = sctp_sockaddr_af(sp, addr, len);
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
349 snum = ntohs(addr->v4.sin_port);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
358 /* PF specific bind() address verification. */
359 if (!sp->pf->bind_verify(sp, addr))
360 return -EADDRNOTAVAIL;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
369 else if (snum != bp->port) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum, bp->port);
377 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
380 /* Make sure we are allowed to bind here.
381 * The function sctp_get_port_local() does duplicate address
384 addr->v4.sin_port = htons(snum);
385 if ((ret = sctp_get_port_local(sk, addr))) {
386 if (ret == (long) sk) {
387 /* This endpoint has a conflicting address. */
394 /* Refresh ephemeral port. */
396 bp->port = inet_sk(sk)->num;
398 /* Add the address to the bind address list.
399 * Use GFP_ATOMIC since BHs will be disabled.
401 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
403 /* Copy back into socket for getsockname() use. */
405 inet_sk(sk)->sport = htons(inet_sk(sk)->num);
406 af->to_sk_saddr(addr, sk);
412 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
414 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
415 * at any one time. If a sender, after sending an ASCONF chunk, decides
416 * it needs to transfer another ASCONF Chunk, it MUST wait until the
417 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
418 * subsequent ASCONF. Note this restriction binds each side, so at any
419 * time two ASCONF may be in-transit on any given association (one sent
420 * from each endpoint).
422 static int sctp_send_asconf(struct sctp_association *asoc,
423 struct sctp_chunk *chunk)
427 /* If there is an outstanding ASCONF chunk, queue it for later
430 if (asoc->addip_last_asconf) {
431 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
435 /* Hold the chunk until an ASCONF_ACK is received. */
436 sctp_chunk_hold(chunk);
437 retval = sctp_primitive_ASCONF(asoc, chunk);
439 sctp_chunk_free(chunk);
441 asoc->addip_last_asconf = chunk;
447 /* Add a list of addresses as bind addresses to local endpoint or
450 * Basically run through each address specified in the addrs/addrcnt
451 * array/length pair, determine if it is IPv6 or IPv4 and call
452 * sctp_do_bind() on it.
454 * If any of them fails, then the operation will be reversed and the
455 * ones that were added will be removed.
457 * Only sctp_setsockopt_bindx() is supposed to call this function.
459 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
464 struct sockaddr *sa_addr;
467 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
471 for (cnt = 0; cnt < addrcnt; cnt++) {
472 /* The list may contain either IPv4 or IPv6 address;
473 * determine the address length for walking thru the list.
475 sa_addr = (struct sockaddr *)addr_buf;
476 af = sctp_get_af_specific(sa_addr->sa_family);
482 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
485 addr_buf += af->sockaddr_len;
489 /* Failed. Cleanup the ones that have been added */
491 sctp_bindx_rem(sk, addrs, cnt);
499 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
500 * associations that are part of the endpoint indicating that a list of local
501 * addresses are added to the endpoint.
503 * If any of the addresses is already in the bind address list of the
504 * association, we do not send the chunk for that association. But it will not
505 * affect other associations.
507 * Only sctp_setsockopt_bindx() is supposed to call this function.
509 static int sctp_send_asconf_add_ip(struct sock *sk,
510 struct sockaddr *addrs,
513 struct sctp_sock *sp;
514 struct sctp_endpoint *ep;
515 struct sctp_association *asoc;
516 struct sctp_bind_addr *bp;
517 struct sctp_chunk *chunk;
518 struct sctp_sockaddr_entry *laddr;
519 union sctp_addr *addr;
520 union sctp_addr saveaddr;
527 if (!sctp_addip_enable)
533 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
534 __func__, sk, addrs, addrcnt);
536 list_for_each_entry(asoc, &ep->asocs, asocs) {
538 if (!asoc->peer.asconf_capable)
541 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
544 if (!sctp_state(asoc, ESTABLISHED))
547 /* Check if any address in the packed array of addresses is
548 * in the bind address list of the association. If so,
549 * do not send the asconf chunk to its peer, but continue with
550 * other associations.
553 for (i = 0; i < addrcnt; i++) {
554 addr = (union sctp_addr *)addr_buf;
555 af = sctp_get_af_specific(addr->v4.sin_family);
561 if (sctp_assoc_lookup_laddr(asoc, addr))
564 addr_buf += af->sockaddr_len;
569 /* Use the first valid address in bind addr list of
570 * association as Address Parameter of ASCONF CHUNK.
572 bp = &asoc->base.bind_addr;
573 p = bp->address_list.next;
574 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
575 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
576 addrcnt, SCTP_PARAM_ADD_IP);
582 retval = sctp_send_asconf(asoc, chunk);
586 /* Add the new addresses to the bind address list with
587 * use_as_src set to 0.
590 for (i = 0; i < addrcnt; i++) {
591 addr = (union sctp_addr *)addr_buf;
592 af = sctp_get_af_specific(addr->v4.sin_family);
593 memcpy(&saveaddr, addr, af->sockaddr_len);
594 retval = sctp_add_bind_addr(bp, &saveaddr,
595 SCTP_ADDR_NEW, GFP_ATOMIC);
596 addr_buf += af->sockaddr_len;
604 /* Remove a list of addresses from bind addresses list. Do not remove the
607 * Basically run through each address specified in the addrs/addrcnt
608 * array/length pair, determine if it is IPv6 or IPv4 and call
609 * sctp_del_bind() on it.
611 * If any of them fails, then the operation will be reversed and the
612 * ones that were removed will be added back.
614 * At least one address has to be left; if only one address is
615 * available, the operation will return -EBUSY.
617 * Only sctp_setsockopt_bindx() is supposed to call this function.
619 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
621 struct sctp_sock *sp = sctp_sk(sk);
622 struct sctp_endpoint *ep = sp->ep;
624 struct sctp_bind_addr *bp = &ep->base.bind_addr;
627 union sctp_addr *sa_addr;
630 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
634 for (cnt = 0; cnt < addrcnt; cnt++) {
635 /* If the bind address list is empty or if there is only one
636 * bind address, there is nothing more to be removed (we need
637 * at least one address here).
639 if (list_empty(&bp->address_list) ||
640 (sctp_list_single_entry(&bp->address_list))) {
645 sa_addr = (union sctp_addr *)addr_buf;
646 af = sctp_get_af_specific(sa_addr->sa.sa_family);
652 if (!af->addr_valid(sa_addr, sp, NULL)) {
653 retval = -EADDRNOTAVAIL;
657 if (sa_addr->v4.sin_port != htons(bp->port)) {
662 /* FIXME - There is probably a need to check if sk->sk_saddr and
663 * sk->sk_rcv_addr are currently set to one of the addresses to
664 * be removed. This is something which needs to be looked into
665 * when we are fixing the outstanding issues with multi-homing
666 * socket routing and failover schemes. Refer to comments in
667 * sctp_do_bind(). -daisy
669 retval = sctp_del_bind_addr(bp, sa_addr);
671 addr_buf += af->sockaddr_len;
674 /* Failed. Add the ones that has been removed back */
676 sctp_bindx_add(sk, addrs, cnt);
684 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
685 * the associations that are part of the endpoint indicating that a list of
686 * local addresses are removed from the endpoint.
688 * If any of the addresses is already in the bind address list of the
689 * association, we do not send the chunk for that association. But it will not
690 * affect other associations.
692 * Only sctp_setsockopt_bindx() is supposed to call this function.
694 static int sctp_send_asconf_del_ip(struct sock *sk,
695 struct sockaddr *addrs,
698 struct sctp_sock *sp;
699 struct sctp_endpoint *ep;
700 struct sctp_association *asoc;
701 struct sctp_transport *transport;
702 struct sctp_bind_addr *bp;
703 struct sctp_chunk *chunk;
704 union sctp_addr *laddr;
707 struct sctp_sockaddr_entry *saddr;
711 if (!sctp_addip_enable)
717 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
718 __func__, sk, addrs, addrcnt);
720 list_for_each_entry(asoc, &ep->asocs, asocs) {
722 if (!asoc->peer.asconf_capable)
725 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
728 if (!sctp_state(asoc, ESTABLISHED))
731 /* Check if any address in the packed array of addresses is
732 * not present in the bind address list of the association.
733 * If so, do not send the asconf chunk to its peer, but
734 * continue with other associations.
737 for (i = 0; i < addrcnt; i++) {
738 laddr = (union sctp_addr *)addr_buf;
739 af = sctp_get_af_specific(laddr->v4.sin_family);
745 if (!sctp_assoc_lookup_laddr(asoc, laddr))
748 addr_buf += af->sockaddr_len;
753 /* Find one address in the association's bind address list
754 * that is not in the packed array of addresses. This is to
755 * make sure that we do not delete all the addresses in the
758 bp = &asoc->base.bind_addr;
759 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
764 /* We do not need RCU protection throughout this loop
765 * because this is done under a socket lock from the
768 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
775 /* Reset use_as_src flag for the addresses in the bind address
776 * list that are to be deleted.
779 for (i = 0; i < addrcnt; i++) {
780 laddr = (union sctp_addr *)addr_buf;
781 af = sctp_get_af_specific(laddr->v4.sin_family);
782 list_for_each_entry(saddr, &bp->address_list, list) {
783 if (sctp_cmp_addr_exact(&saddr->a, laddr))
784 saddr->state = SCTP_ADDR_DEL;
786 addr_buf += af->sockaddr_len;
789 /* Update the route and saddr entries for all the transports
790 * as some of the addresses in the bind address list are
791 * about to be deleted and cannot be used as source addresses.
793 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
795 dst_release(transport->dst);
796 sctp_transport_route(transport, NULL,
797 sctp_sk(asoc->base.sk));
800 retval = sctp_send_asconf(asoc, chunk);
806 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
809 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
812 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
813 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
816 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
817 * Section 3.1.2 for this usage.
819 * addrs is a pointer to an array of one or more socket addresses. Each
820 * address is contained in its appropriate structure (i.e. struct
821 * sockaddr_in or struct sockaddr_in6) the family of the address type
822 * must be used to distinguish the address length (note that this
823 * representation is termed a "packed array" of addresses). The caller
824 * specifies the number of addresses in the array with addrcnt.
826 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
827 * -1, and sets errno to the appropriate error code.
829 * For SCTP, the port given in each socket address must be the same, or
830 * sctp_bindx() will fail, setting errno to EINVAL.
832 * The flags parameter is formed from the bitwise OR of zero or more of
833 * the following currently defined flags:
835 * SCTP_BINDX_ADD_ADDR
837 * SCTP_BINDX_REM_ADDR
839 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
840 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
841 * addresses from the association. The two flags are mutually exclusive;
842 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
843 * not remove all addresses from an association; sctp_bindx() will
844 * reject such an attempt with EINVAL.
846 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
847 * additional addresses with an endpoint after calling bind(). Or use
848 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
849 * socket is associated with so that no new association accepted will be
850 * associated with those addresses. If the endpoint supports dynamic
851 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
852 * endpoint to send the appropriate message to the peer to change the
853 * peers address lists.
855 * Adding and removing addresses from a connected association is
856 * optional functionality. Implementations that do not support this
857 * functionality should return EOPNOTSUPP.
859 * Basically do nothing but copying the addresses from user to kernel
860 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
861 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
864 * We don't use copy_from_user() for optimization: we first do the
865 * sanity checks (buffer size -fast- and access check-healthy
866 * pointer); if all of those succeed, then we can alloc the memory
867 * (expensive operation) needed to copy the data to kernel. Then we do
868 * the copying without checking the user space area
869 * (__copy_from_user()).
871 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
874 * sk The sk of the socket
875 * addrs The pointer to the addresses in user land
876 * addrssize Size of the addrs buffer
877 * op Operation to perform (add or remove, see the flags of
880 * Returns 0 if ok, <0 errno code on error.
882 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
883 struct sockaddr __user *addrs,
884 int addrs_size, int op)
886 struct sockaddr *kaddrs;
890 struct sockaddr *sa_addr;
894 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
895 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
897 if (unlikely(addrs_size <= 0))
900 /* Check the user passed a healthy pointer. */
901 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
904 /* Alloc space for the address array in kernel memory. */
905 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
906 if (unlikely(!kaddrs))
909 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
914 /* Walk through the addrs buffer and count the number of addresses. */
916 while (walk_size < addrs_size) {
917 sa_addr = (struct sockaddr *)addr_buf;
918 af = sctp_get_af_specific(sa_addr->sa_family);
920 /* If the address family is not supported or if this address
921 * causes the address buffer to overflow return EINVAL.
923 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
928 addr_buf += af->sockaddr_len;
929 walk_size += af->sockaddr_len;
934 case SCTP_BINDX_ADD_ADDR:
935 err = sctp_bindx_add(sk, kaddrs, addrcnt);
938 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
941 case SCTP_BINDX_REM_ADDR:
942 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
945 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
959 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
961 * Common routine for handling connect() and sctp_connectx().
962 * Connect will come in with just a single address.
964 static int __sctp_connect(struct sock* sk,
965 struct sockaddr *kaddrs,
967 sctp_assoc_t *assoc_id)
969 struct sctp_sock *sp;
970 struct sctp_endpoint *ep;
971 struct sctp_association *asoc = NULL;
972 struct sctp_association *asoc2;
973 struct sctp_transport *transport;
981 union sctp_addr *sa_addr = NULL;
984 unsigned int f_flags = 0;
989 /* connect() cannot be done on a socket that is already in ESTABLISHED
990 * state - UDP-style peeled off socket or a TCP-style socket that
991 * is already connected.
992 * It cannot be done even on a TCP-style listening socket.
994 if (sctp_sstate(sk, ESTABLISHED) ||
995 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1000 /* Walk through the addrs buffer and count the number of addresses. */
1002 while (walk_size < addrs_size) {
1003 sa_addr = (union sctp_addr *)addr_buf;
1004 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1005 port = ntohs(sa_addr->v4.sin_port);
1007 /* If the address family is not supported or if this address
1008 * causes the address buffer to overflow return EINVAL.
1010 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1015 /* Save current address so we can work with it */
1016 memcpy(&to, sa_addr, af->sockaddr_len);
1018 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1022 /* Make sure the destination port is correctly set
1025 if (asoc && asoc->peer.port && asoc->peer.port != port)
1029 /* Check if there already is a matching association on the
1030 * endpoint (other than the one created here).
1032 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1033 if (asoc2 && asoc2 != asoc) {
1034 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1041 /* If we could not find a matching association on the endpoint,
1042 * make sure that there is no peeled-off association matching
1043 * the peer address even on another socket.
1045 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1046 err = -EADDRNOTAVAIL;
1051 /* If a bind() or sctp_bindx() is not called prior to
1052 * an sctp_connectx() call, the system picks an
1053 * ephemeral port and will choose an address set
1054 * equivalent to binding with a wildcard address.
1056 if (!ep->base.bind_addr.port) {
1057 if (sctp_autobind(sk)) {
1063 * If an unprivileged user inherits a 1-many
1064 * style socket with open associations on a
1065 * privileged port, it MAY be permitted to
1066 * accept new associations, but it SHOULD NOT
1067 * be permitted to open new associations.
1069 if (ep->base.bind_addr.port < PROT_SOCK &&
1070 !capable(CAP_NET_BIND_SERVICE)) {
1076 scope = sctp_scope(&to);
1077 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1084 /* Prime the peer's transport structures. */
1085 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1093 addr_buf += af->sockaddr_len;
1094 walk_size += af->sockaddr_len;
1097 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1102 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1107 /* Initialize sk's dport and daddr for getpeername() */
1108 inet_sk(sk)->dport = htons(asoc->peer.port);
1109 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1110 af->to_sk_daddr(sa_addr, sk);
1113 /* in-kernel sockets don't generally have a file allocated to them
1114 * if all they do is call sock_create_kern().
1116 if (sk->sk_socket->file)
1117 f_flags = sk->sk_socket->file->f_flags;
1119 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1121 err = sctp_wait_for_connect(asoc, &timeo);
1122 if (!err && assoc_id)
1123 *assoc_id = asoc->assoc_id;
1125 /* Don't free association on exit. */
1130 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1131 " kaddrs: %p err: %d\n",
1134 sctp_association_free(asoc);
1138 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1141 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1142 * sctp_assoc_t *asoc);
1144 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1145 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1146 * or IPv6 addresses.
1148 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1149 * Section 3.1.2 for this usage.
1151 * addrs is a pointer to an array of one or more socket addresses. Each
1152 * address is contained in its appropriate structure (i.e. struct
1153 * sockaddr_in or struct sockaddr_in6) the family of the address type
1154 * must be used to distengish the address length (note that this
1155 * representation is termed a "packed array" of addresses). The caller
1156 * specifies the number of addresses in the array with addrcnt.
1158 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1159 * the association id of the new association. On failure, sctp_connectx()
1160 * returns -1, and sets errno to the appropriate error code. The assoc_id
1161 * is not touched by the kernel.
1163 * For SCTP, the port given in each socket address must be the same, or
1164 * sctp_connectx() will fail, setting errno to EINVAL.
1166 * An application can use sctp_connectx to initiate an association with
1167 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1168 * allows a caller to specify multiple addresses at which a peer can be
1169 * reached. The way the SCTP stack uses the list of addresses to set up
1170 * the association is implementation dependant. This function only
1171 * specifies that the stack will try to make use of all the addresses in
1172 * the list when needed.
1174 * Note that the list of addresses passed in is only used for setting up
1175 * the association. It does not necessarily equal the set of addresses
1176 * the peer uses for the resulting association. If the caller wants to
1177 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1178 * retrieve them after the association has been set up.
1180 * Basically do nothing but copying the addresses from user to kernel
1181 * land and invoking either sctp_connectx(). This is used for tunneling
1182 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1184 * We don't use copy_from_user() for optimization: we first do the
1185 * sanity checks (buffer size -fast- and access check-healthy
1186 * pointer); if all of those succeed, then we can alloc the memory
1187 * (expensive operation) needed to copy the data to kernel. Then we do
1188 * the copying without checking the user space area
1189 * (__copy_from_user()).
1191 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1194 * sk The sk of the socket
1195 * addrs The pointer to the addresses in user land
1196 * addrssize Size of the addrs buffer
1198 * Returns >=0 if ok, <0 errno code on error.
1200 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1201 struct sockaddr __user *addrs,
1203 sctp_assoc_t *assoc_id)
1206 struct sockaddr *kaddrs;
1208 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1209 __func__, sk, addrs, addrs_size);
1211 if (unlikely(addrs_size <= 0))
1214 /* Check the user passed a healthy pointer. */
1215 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1218 /* Alloc space for the address array in kernel memory. */
1219 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1220 if (unlikely(!kaddrs))
1223 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1226 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1235 * This is an older interface. It's kept for backward compatibility
1236 * to the option that doesn't provide association id.
1238 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1239 struct sockaddr __user *addrs,
1242 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1246 * New interface for the API. The since the API is done with a socket
1247 * option, to make it simple we feed back the association id is as a return
1248 * indication to the call. Error is always negative and association id is
1251 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1252 struct sockaddr __user *addrs,
1255 sctp_assoc_t assoc_id = 0;
1258 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1266 /* API 3.1.4 close() - UDP Style Syntax
1267 * Applications use close() to perform graceful shutdown (as described in
1268 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1269 * by a UDP-style socket.
1273 * ret = close(int sd);
1275 * sd - the socket descriptor of the associations to be closed.
1277 * To gracefully shutdown a specific association represented by the
1278 * UDP-style socket, an application should use the sendmsg() call,
1279 * passing no user data, but including the appropriate flag in the
1280 * ancillary data (see Section xxxx).
1282 * If sd in the close() call is a branched-off socket representing only
1283 * one association, the shutdown is performed on that association only.
1285 * 4.1.6 close() - TCP Style Syntax
1287 * Applications use close() to gracefully close down an association.
1291 * int close(int sd);
1293 * sd - the socket descriptor of the association to be closed.
1295 * After an application calls close() on a socket descriptor, no further
1296 * socket operations will succeed on that descriptor.
1298 * API 7.1.4 SO_LINGER
1300 * An application using the TCP-style socket can use this option to
1301 * perform the SCTP ABORT primitive. The linger option structure is:
1304 * int l_onoff; // option on/off
1305 * int l_linger; // linger time
1308 * To enable the option, set l_onoff to 1. If the l_linger value is set
1309 * to 0, calling close() is the same as the ABORT primitive. If the
1310 * value is set to a negative value, the setsockopt() call will return
1311 * an error. If the value is set to a positive value linger_time, the
1312 * close() can be blocked for at most linger_time ms. If the graceful
1313 * shutdown phase does not finish during this period, close() will
1314 * return but the graceful shutdown phase continues in the system.
1316 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1318 struct sctp_endpoint *ep;
1319 struct sctp_association *asoc;
1320 struct list_head *pos, *temp;
1322 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1325 sk->sk_shutdown = SHUTDOWN_MASK;
1327 ep = sctp_sk(sk)->ep;
1329 /* Walk all associations on an endpoint. */
1330 list_for_each_safe(pos, temp, &ep->asocs) {
1331 asoc = list_entry(pos, struct sctp_association, asocs);
1333 if (sctp_style(sk, TCP)) {
1334 /* A closed association can still be in the list if
1335 * it belongs to a TCP-style listening socket that is
1336 * not yet accepted. If so, free it. If not, send an
1337 * ABORT or SHUTDOWN based on the linger options.
1339 if (sctp_state(asoc, CLOSED)) {
1340 sctp_unhash_established(asoc);
1341 sctp_association_free(asoc);
1346 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1347 struct sctp_chunk *chunk;
1349 chunk = sctp_make_abort_user(asoc, NULL, 0);
1351 sctp_primitive_ABORT(asoc, chunk);
1353 sctp_primitive_SHUTDOWN(asoc, NULL);
1356 /* Clean up any skbs sitting on the receive queue. */
1357 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1358 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1360 /* On a TCP-style socket, block for at most linger_time if set. */
1361 if (sctp_style(sk, TCP) && timeout)
1362 sctp_wait_for_close(sk, timeout);
1364 /* This will run the backlog queue. */
1365 sctp_release_sock(sk);
1367 /* Supposedly, no process has access to the socket, but
1368 * the net layers still may.
1370 sctp_local_bh_disable();
1371 sctp_bh_lock_sock(sk);
1373 /* Hold the sock, since sk_common_release() will put sock_put()
1374 * and we have just a little more cleanup.
1377 sk_common_release(sk);
1379 sctp_bh_unlock_sock(sk);
1380 sctp_local_bh_enable();
1384 SCTP_DBG_OBJCNT_DEC(sock);
1387 /* Handle EPIPE error. */
1388 static int sctp_error(struct sock *sk, int flags, int err)
1391 err = sock_error(sk) ? : -EPIPE;
1392 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1393 send_sig(SIGPIPE, current, 0);
1397 /* API 3.1.3 sendmsg() - UDP Style Syntax
1399 * An application uses sendmsg() and recvmsg() calls to transmit data to
1400 * and receive data from its peer.
1402 * ssize_t sendmsg(int socket, const struct msghdr *message,
1405 * socket - the socket descriptor of the endpoint.
1406 * message - pointer to the msghdr structure which contains a single
1407 * user message and possibly some ancillary data.
1409 * See Section 5 for complete description of the data
1412 * flags - flags sent or received with the user message, see Section
1413 * 5 for complete description of the flags.
1415 * Note: This function could use a rewrite especially when explicit
1416 * connect support comes in.
1418 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1420 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1422 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1423 struct msghdr *msg, size_t msg_len)
1425 struct sctp_sock *sp;
1426 struct sctp_endpoint *ep;
1427 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1428 struct sctp_transport *transport, *chunk_tp;
1429 struct sctp_chunk *chunk;
1431 struct sockaddr *msg_name = NULL;
1432 struct sctp_sndrcvinfo default_sinfo = { 0 };
1433 struct sctp_sndrcvinfo *sinfo;
1434 struct sctp_initmsg *sinit;
1435 sctp_assoc_t associd = 0;
1436 sctp_cmsgs_t cmsgs = { NULL };
1440 __u16 sinfo_flags = 0;
1441 struct sctp_datamsg *datamsg;
1442 int msg_flags = msg->msg_flags;
1444 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1451 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1453 /* We cannot send a message over a TCP-style listening socket. */
1454 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1459 /* Parse out the SCTP CMSGs. */
1460 err = sctp_msghdr_parse(msg, &cmsgs);
1463 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1467 /* Fetch the destination address for this packet. This
1468 * address only selects the association--it is not necessarily
1469 * the address we will send to.
1470 * For a peeled-off socket, msg_name is ignored.
1472 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1473 int msg_namelen = msg->msg_namelen;
1475 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1480 if (msg_namelen > sizeof(to))
1481 msg_namelen = sizeof(to);
1482 memcpy(&to, msg->msg_name, msg_namelen);
1483 msg_name = msg->msg_name;
1489 /* Did the user specify SNDRCVINFO? */
1491 sinfo_flags = sinfo->sinfo_flags;
1492 associd = sinfo->sinfo_assoc_id;
1495 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1496 msg_len, sinfo_flags);
1498 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1499 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1504 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1505 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1506 * If SCTP_ABORT is set, the message length could be non zero with
1507 * the msg_iov set to the user abort reason.
1509 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1510 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1515 /* If SCTP_ADDR_OVER is set, there must be an address
1516 * specified in msg_name.
1518 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1525 SCTP_DEBUG_PRINTK("About to look up association.\n");
1529 /* If a msg_name has been specified, assume this is to be used. */
1531 /* Look for a matching association on the endpoint. */
1532 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1534 /* If we could not find a matching association on the
1535 * endpoint, make sure that it is not a TCP-style
1536 * socket that already has an association or there is
1537 * no peeled-off association on another socket.
1539 if ((sctp_style(sk, TCP) &&
1540 sctp_sstate(sk, ESTABLISHED)) ||
1541 sctp_endpoint_is_peeled_off(ep, &to)) {
1542 err = -EADDRNOTAVAIL;
1547 asoc = sctp_id2assoc(sk, associd);
1555 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1557 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1558 * socket that has an association in CLOSED state. This can
1559 * happen when an accepted socket has an association that is
1562 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1567 if (sinfo_flags & SCTP_EOF) {
1568 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1570 sctp_primitive_SHUTDOWN(asoc, NULL);
1574 if (sinfo_flags & SCTP_ABORT) {
1576 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1582 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1583 sctp_primitive_ABORT(asoc, chunk);
1589 /* Do we need to create the association? */
1591 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1593 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1598 /* Check for invalid stream against the stream counts,
1599 * either the default or the user specified stream counts.
1602 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1603 /* Check against the defaults. */
1604 if (sinfo->sinfo_stream >=
1605 sp->initmsg.sinit_num_ostreams) {
1610 /* Check against the requested. */
1611 if (sinfo->sinfo_stream >=
1612 sinit->sinit_num_ostreams) {
1620 * API 3.1.2 bind() - UDP Style Syntax
1621 * If a bind() or sctp_bindx() is not called prior to a
1622 * sendmsg() call that initiates a new association, the
1623 * system picks an ephemeral port and will choose an address
1624 * set equivalent to binding with a wildcard address.
1626 if (!ep->base.bind_addr.port) {
1627 if (sctp_autobind(sk)) {
1633 * If an unprivileged user inherits a one-to-many
1634 * style socket with open associations on a privileged
1635 * port, it MAY be permitted to accept new associations,
1636 * but it SHOULD NOT be permitted to open new
1639 if (ep->base.bind_addr.port < PROT_SOCK &&
1640 !capable(CAP_NET_BIND_SERVICE)) {
1646 scope = sctp_scope(&to);
1647 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1654 /* If the SCTP_INIT ancillary data is specified, set all
1655 * the association init values accordingly.
1658 if (sinit->sinit_num_ostreams) {
1659 asoc->c.sinit_num_ostreams =
1660 sinit->sinit_num_ostreams;
1662 if (sinit->sinit_max_instreams) {
1663 asoc->c.sinit_max_instreams =
1664 sinit->sinit_max_instreams;
1666 if (sinit->sinit_max_attempts) {
1667 asoc->max_init_attempts
1668 = sinit->sinit_max_attempts;
1670 if (sinit->sinit_max_init_timeo) {
1671 asoc->max_init_timeo =
1672 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1676 /* Prime the peer's transport structures. */
1677 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1682 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1689 /* ASSERT: we have a valid association at this point. */
1690 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1693 /* If the user didn't specify SNDRCVINFO, make up one with
1696 default_sinfo.sinfo_stream = asoc->default_stream;
1697 default_sinfo.sinfo_flags = asoc->default_flags;
1698 default_sinfo.sinfo_ppid = asoc->default_ppid;
1699 default_sinfo.sinfo_context = asoc->default_context;
1700 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1701 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1702 sinfo = &default_sinfo;
1705 /* API 7.1.7, the sndbuf size per association bounds the
1706 * maximum size of data that can be sent in a single send call.
1708 if (msg_len > sk->sk_sndbuf) {
1713 if (asoc->pmtu_pending)
1714 sctp_assoc_pending_pmtu(asoc);
1716 /* If fragmentation is disabled and the message length exceeds the
1717 * association fragmentation point, return EMSGSIZE. The I-D
1718 * does not specify what this error is, but this looks like
1721 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1727 /* Check for invalid stream. */
1728 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1734 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1735 if (!sctp_wspace(asoc)) {
1736 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1741 /* If an address is passed with the sendto/sendmsg call, it is used
1742 * to override the primary destination address in the TCP model, or
1743 * when SCTP_ADDR_OVER flag is set in the UDP model.
1745 if ((sctp_style(sk, TCP) && msg_name) ||
1746 (sinfo_flags & SCTP_ADDR_OVER)) {
1747 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1755 /* Auto-connect, if we aren't connected already. */
1756 if (sctp_state(asoc, CLOSED)) {
1757 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1760 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1763 /* Break the message into multiple chunks of maximum size. */
1764 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1770 /* Now send the (possibly) fragmented message. */
1771 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1772 sctp_chunk_hold(chunk);
1774 /* Do accounting for the write space. */
1775 sctp_set_owner_w(chunk);
1777 chunk->transport = chunk_tp;
1779 /* Send it to the lower layers. Note: all chunks
1780 * must either fail or succeed. The lower layer
1781 * works that way today. Keep it that way or this
1784 err = sctp_primitive_SEND(asoc, chunk);
1785 /* Did the lower layer accept the chunk? */
1787 sctp_chunk_free(chunk);
1788 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1791 sctp_datamsg_put(datamsg);
1797 /* If we are already past ASSOCIATE, the lower
1798 * layers are responsible for association cleanup.
1804 sctp_association_free(asoc);
1806 sctp_release_sock(sk);
1809 return sctp_error(sk, msg_flags, err);
1816 err = sock_error(sk);
1826 /* This is an extended version of skb_pull() that removes the data from the
1827 * start of a skb even when data is spread across the list of skb's in the
1828 * frag_list. len specifies the total amount of data that needs to be removed.
1829 * when 'len' bytes could be removed from the skb, it returns 0.
1830 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1831 * could not be removed.
1833 static int sctp_skb_pull(struct sk_buff *skb, int len)
1835 struct sk_buff *list;
1836 int skb_len = skb_headlen(skb);
1839 if (len <= skb_len) {
1840 __skb_pull(skb, len);
1844 __skb_pull(skb, skb_len);
1846 for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
1847 rlen = sctp_skb_pull(list, len);
1848 skb->len -= (len-rlen);
1849 skb->data_len -= (len-rlen);
1860 /* API 3.1.3 recvmsg() - UDP Style Syntax
1862 * ssize_t recvmsg(int socket, struct msghdr *message,
1865 * socket - the socket descriptor of the endpoint.
1866 * message - pointer to the msghdr structure which contains a single
1867 * user message and possibly some ancillary data.
1869 * See Section 5 for complete description of the data
1872 * flags - flags sent or received with the user message, see Section
1873 * 5 for complete description of the flags.
1875 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1877 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1878 struct msghdr *msg, size_t len, int noblock,
1879 int flags, int *addr_len)
1881 struct sctp_ulpevent *event = NULL;
1882 struct sctp_sock *sp = sctp_sk(sk);
1883 struct sk_buff *skb;
1888 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1889 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1890 "len", len, "knoblauch", noblock,
1891 "flags", flags, "addr_len", addr_len);
1895 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1900 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1904 /* Get the total length of the skb including any skb's in the
1913 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1915 event = sctp_skb2event(skb);
1920 sock_recv_timestamp(msg, sk, skb);
1921 if (sctp_ulpevent_is_notification(event)) {
1922 msg->msg_flags |= MSG_NOTIFICATION;
1923 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1925 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1928 /* Check if we allow SCTP_SNDRCVINFO. */
1929 if (sp->subscribe.sctp_data_io_event)
1930 sctp_ulpevent_read_sndrcvinfo(event, msg);
1932 /* FIXME: we should be calling IP/IPv6 layers. */
1933 if (sk->sk_protinfo.af_inet.cmsg_flags)
1934 ip_cmsg_recv(msg, skb);
1939 /* If skb's length exceeds the user's buffer, update the skb and
1940 * push it back to the receive_queue so that the next call to
1941 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1943 if (skb_len > copied) {
1944 msg->msg_flags &= ~MSG_EOR;
1945 if (flags & MSG_PEEK)
1947 sctp_skb_pull(skb, copied);
1948 skb_queue_head(&sk->sk_receive_queue, skb);
1950 /* When only partial message is copied to the user, increase
1951 * rwnd by that amount. If all the data in the skb is read,
1952 * rwnd is updated when the event is freed.
1954 if (!sctp_ulpevent_is_notification(event))
1955 sctp_assoc_rwnd_increase(event->asoc, copied);
1957 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
1958 (event->msg_flags & MSG_EOR))
1959 msg->msg_flags |= MSG_EOR;
1961 msg->msg_flags &= ~MSG_EOR;
1964 if (flags & MSG_PEEK) {
1965 /* Release the skb reference acquired after peeking the skb in
1966 * sctp_skb_recv_datagram().
1970 /* Free the event which includes releasing the reference to
1971 * the owner of the skb, freeing the skb and updating the
1974 sctp_ulpevent_free(event);
1977 sctp_release_sock(sk);
1981 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1983 * This option is a on/off flag. If enabled no SCTP message
1984 * fragmentation will be performed. Instead if a message being sent
1985 * exceeds the current PMTU size, the message will NOT be sent and
1986 * instead a error will be indicated to the user.
1988 static int sctp_setsockopt_disable_fragments(struct sock *sk,
1989 char __user *optval, int optlen)
1993 if (optlen < sizeof(int))
1996 if (get_user(val, (int __user *)optval))
1999 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2004 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2007 if (optlen > sizeof(struct sctp_event_subscribe))
2009 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2014 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2016 * This socket option is applicable to the UDP-style socket only. When
2017 * set it will cause associations that are idle for more than the
2018 * specified number of seconds to automatically close. An association
2019 * being idle is defined an association that has NOT sent or received
2020 * user data. The special value of '0' indicates that no automatic
2021 * close of any associations should be performed. The option expects an
2022 * integer defining the number of seconds of idle time before an
2023 * association is closed.
2025 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2028 struct sctp_sock *sp = sctp_sk(sk);
2030 /* Applicable to UDP-style socket only */
2031 if (sctp_style(sk, TCP))
2033 if (optlen != sizeof(int))
2035 if (copy_from_user(&sp->autoclose, optval, optlen))
2041 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2043 * Applications can enable or disable heartbeats for any peer address of
2044 * an association, modify an address's heartbeat interval, force a
2045 * heartbeat to be sent immediately, and adjust the address's maximum
2046 * number of retransmissions sent before an address is considered
2047 * unreachable. The following structure is used to access and modify an
2048 * address's parameters:
2050 * struct sctp_paddrparams {
2051 * sctp_assoc_t spp_assoc_id;
2052 * struct sockaddr_storage spp_address;
2053 * uint32_t spp_hbinterval;
2054 * uint16_t spp_pathmaxrxt;
2055 * uint32_t spp_pathmtu;
2056 * uint32_t spp_sackdelay;
2057 * uint32_t spp_flags;
2060 * spp_assoc_id - (one-to-many style socket) This is filled in the
2061 * application, and identifies the association for
2063 * spp_address - This specifies which address is of interest.
2064 * spp_hbinterval - This contains the value of the heartbeat interval,
2065 * in milliseconds. If a value of zero
2066 * is present in this field then no changes are to
2067 * be made to this parameter.
2068 * spp_pathmaxrxt - This contains the maximum number of
2069 * retransmissions before this address shall be
2070 * considered unreachable. If a value of zero
2071 * is present in this field then no changes are to
2072 * be made to this parameter.
2073 * spp_pathmtu - When Path MTU discovery is disabled the value
2074 * specified here will be the "fixed" path mtu.
2075 * Note that if the spp_address field is empty
2076 * then all associations on this address will
2077 * have this fixed path mtu set upon them.
2079 * spp_sackdelay - When delayed sack is enabled, this value specifies
2080 * the number of milliseconds that sacks will be delayed
2081 * for. This value will apply to all addresses of an
2082 * association if the spp_address field is empty. Note
2083 * also, that if delayed sack is enabled and this
2084 * value is set to 0, no change is made to the last
2085 * recorded delayed sack timer value.
2087 * spp_flags - These flags are used to control various features
2088 * on an association. The flag field may contain
2089 * zero or more of the following options.
2091 * SPP_HB_ENABLE - Enable heartbeats on the
2092 * specified address. Note that if the address
2093 * field is empty all addresses for the association
2094 * have heartbeats enabled upon them.
2096 * SPP_HB_DISABLE - Disable heartbeats on the
2097 * speicifed address. Note that if the address
2098 * field is empty all addresses for the association
2099 * will have their heartbeats disabled. Note also
2100 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2101 * mutually exclusive, only one of these two should
2102 * be specified. Enabling both fields will have
2103 * undetermined results.
2105 * SPP_HB_DEMAND - Request a user initiated heartbeat
2106 * to be made immediately.
2108 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2109 * heartbeat delayis to be set to the value of 0
2112 * SPP_PMTUD_ENABLE - This field will enable PMTU
2113 * discovery upon the specified address. Note that
2114 * if the address feild is empty then all addresses
2115 * on the association are effected.
2117 * SPP_PMTUD_DISABLE - This field will disable PMTU
2118 * discovery upon the specified address. Note that
2119 * if the address feild is empty then all addresses
2120 * on the association are effected. Not also that
2121 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2122 * exclusive. Enabling both will have undetermined
2125 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2126 * on delayed sack. The time specified in spp_sackdelay
2127 * is used to specify the sack delay for this address. Note
2128 * that if spp_address is empty then all addresses will
2129 * enable delayed sack and take on the sack delay
2130 * value specified in spp_sackdelay.
2131 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2132 * off delayed sack. If the spp_address field is blank then
2133 * delayed sack is disabled for the entire association. Note
2134 * also that this field is mutually exclusive to
2135 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2138 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2139 struct sctp_transport *trans,
2140 struct sctp_association *asoc,
2141 struct sctp_sock *sp,
2144 int sackdelay_change)
2148 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2149 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2154 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2155 * this field is ignored. Note also that a value of zero indicates
2156 * the current setting should be left unchanged.
2158 if (params->spp_flags & SPP_HB_ENABLE) {
2160 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2161 * set. This lets us use 0 value when this flag
2164 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2165 params->spp_hbinterval = 0;
2167 if (params->spp_hbinterval ||
2168 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2171 msecs_to_jiffies(params->spp_hbinterval);
2174 msecs_to_jiffies(params->spp_hbinterval);
2176 sp->hbinterval = params->spp_hbinterval;
2183 trans->param_flags =
2184 (trans->param_flags & ~SPP_HB) | hb_change;
2187 (asoc->param_flags & ~SPP_HB) | hb_change;
2190 (sp->param_flags & ~SPP_HB) | hb_change;
2194 /* When Path MTU discovery is disabled the value specified here will
2195 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2196 * include the flag SPP_PMTUD_DISABLE for this field to have any
2199 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2201 trans->pathmtu = params->spp_pathmtu;
2202 sctp_assoc_sync_pmtu(asoc);
2204 asoc->pathmtu = params->spp_pathmtu;
2205 sctp_frag_point(sp, params->spp_pathmtu);
2207 sp->pathmtu = params->spp_pathmtu;
2213 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2214 (params->spp_flags & SPP_PMTUD_ENABLE);
2215 trans->param_flags =
2216 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2218 sctp_transport_pmtu(trans);
2219 sctp_assoc_sync_pmtu(asoc);
2223 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2226 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2230 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2231 * value of this field is ignored. Note also that a value of zero
2232 * indicates the current setting should be left unchanged.
2234 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2237 msecs_to_jiffies(params->spp_sackdelay);
2240 msecs_to_jiffies(params->spp_sackdelay);
2242 sp->sackdelay = params->spp_sackdelay;
2246 if (sackdelay_change) {
2248 trans->param_flags =
2249 (trans->param_flags & ~SPP_SACKDELAY) |
2253 (asoc->param_flags & ~SPP_SACKDELAY) |
2257 (sp->param_flags & ~SPP_SACKDELAY) |
2262 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2263 * of this field is ignored. Note also that a value of zero
2264 * indicates the current setting should be left unchanged.
2266 if ((params->spp_flags & SPP_PMTUD_ENABLE) && params->spp_pathmaxrxt) {
2268 trans->pathmaxrxt = params->spp_pathmaxrxt;
2270 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2272 sp->pathmaxrxt = params->spp_pathmaxrxt;
2279 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2280 char __user *optval, int optlen)
2282 struct sctp_paddrparams params;
2283 struct sctp_transport *trans = NULL;
2284 struct sctp_association *asoc = NULL;
2285 struct sctp_sock *sp = sctp_sk(sk);
2287 int hb_change, pmtud_change, sackdelay_change;
2289 if (optlen != sizeof(struct sctp_paddrparams))
2292 if (copy_from_user(¶ms, optval, optlen))
2295 /* Validate flags and value parameters. */
2296 hb_change = params.spp_flags & SPP_HB;
2297 pmtud_change = params.spp_flags & SPP_PMTUD;
2298 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2300 if (hb_change == SPP_HB ||
2301 pmtud_change == SPP_PMTUD ||
2302 sackdelay_change == SPP_SACKDELAY ||
2303 params.spp_sackdelay > 500 ||
2305 && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2308 /* If an address other than INADDR_ANY is specified, and
2309 * no transport is found, then the request is invalid.
2311 if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
2312 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2313 params.spp_assoc_id);
2318 /* Get association, if assoc_id != 0 and the socket is a one
2319 * to many style socket, and an association was not found, then
2320 * the id was invalid.
2322 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2323 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2326 /* Heartbeat demand can only be sent on a transport or
2327 * association, but not a socket.
2329 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2332 /* Process parameters. */
2333 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2334 hb_change, pmtud_change,
2340 /* If changes are for association, also apply parameters to each
2343 if (!trans && asoc) {
2344 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2346 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2347 hb_change, pmtud_change,
2356 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2358 * This option will effect the way delayed acks are performed. This
2359 * option allows you to get or set the delayed ack time, in
2360 * milliseconds. It also allows changing the delayed ack frequency.
2361 * Changing the frequency to 1 disables the delayed sack algorithm. If
2362 * the assoc_id is 0, then this sets or gets the endpoints default
2363 * values. If the assoc_id field is non-zero, then the set or get
2364 * effects the specified association for the one to many model (the
2365 * assoc_id field is ignored by the one to one model). Note that if
2366 * sack_delay or sack_freq are 0 when setting this option, then the
2367 * current values will remain unchanged.
2369 * struct sctp_sack_info {
2370 * sctp_assoc_t sack_assoc_id;
2371 * uint32_t sack_delay;
2372 * uint32_t sack_freq;
2375 * sack_assoc_id - This parameter, indicates which association the user
2376 * is performing an action upon. Note that if this field's value is
2377 * zero then the endpoints default value is changed (effecting future
2378 * associations only).
2380 * sack_delay - This parameter contains the number of milliseconds that
2381 * the user is requesting the delayed ACK timer be set to. Note that
2382 * this value is defined in the standard to be between 200 and 500
2385 * sack_freq - This parameter contains the number of packets that must
2386 * be received before a sack is sent without waiting for the delay
2387 * timer to expire. The default value for this is 2, setting this
2388 * value to 1 will disable the delayed sack algorithm.
2391 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2392 char __user *optval, int optlen)
2394 struct sctp_sack_info params;
2395 struct sctp_transport *trans = NULL;
2396 struct sctp_association *asoc = NULL;
2397 struct sctp_sock *sp = sctp_sk(sk);
2399 if (optlen == sizeof(struct sctp_sack_info)) {
2400 if (copy_from_user(¶ms, optval, optlen))
2403 if (params.sack_delay == 0 && params.sack_freq == 0)
2405 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2406 printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
2407 "in delayed_ack socket option deprecated\n");
2408 printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
2409 if (copy_from_user(¶ms, optval, optlen))
2412 if (params.sack_delay == 0)
2413 params.sack_freq = 1;
2415 params.sack_freq = 0;
2419 /* Validate value parameter. */
2420 if (params.sack_delay > 500)
2423 /* Get association, if sack_assoc_id != 0 and the socket is a one
2424 * to many style socket, and an association was not found, then
2425 * the id was invalid.
2427 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2428 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2431 if (params.sack_delay) {
2434 msecs_to_jiffies(params.sack_delay);
2436 (asoc->param_flags & ~SPP_SACKDELAY) |
2437 SPP_SACKDELAY_ENABLE;
2439 sp->sackdelay = params.sack_delay;
2441 (sp->param_flags & ~SPP_SACKDELAY) |
2442 SPP_SACKDELAY_ENABLE;
2446 if (params.sack_freq == 1) {
2449 (asoc->param_flags & ~SPP_SACKDELAY) |
2450 SPP_SACKDELAY_DISABLE;
2453 (sp->param_flags & ~SPP_SACKDELAY) |
2454 SPP_SACKDELAY_DISABLE;
2456 } else if (params.sack_freq > 1) {
2458 asoc->sackfreq = params.sack_freq;
2460 (asoc->param_flags & ~SPP_SACKDELAY) |
2461 SPP_SACKDELAY_ENABLE;
2463 sp->sackfreq = params.sack_freq;
2465 (sp->param_flags & ~SPP_SACKDELAY) |
2466 SPP_SACKDELAY_ENABLE;
2470 /* If change is for association, also apply to each transport. */
2472 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2474 if (params.sack_delay) {
2476 msecs_to_jiffies(params.sack_delay);
2477 trans->param_flags =
2478 (trans->param_flags & ~SPP_SACKDELAY) |
2479 SPP_SACKDELAY_ENABLE;
2481 if (params.sack_freq == 1) {
2482 trans->param_flags =
2483 (trans->param_flags & ~SPP_SACKDELAY) |
2484 SPP_SACKDELAY_DISABLE;
2485 } else if (params.sack_freq > 1) {
2486 trans->sackfreq = params.sack_freq;
2487 trans->param_flags =
2488 (trans->param_flags & ~SPP_SACKDELAY) |
2489 SPP_SACKDELAY_ENABLE;
2497 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2499 * Applications can specify protocol parameters for the default association
2500 * initialization. The option name argument to setsockopt() and getsockopt()
2503 * Setting initialization parameters is effective only on an unconnected
2504 * socket (for UDP-style sockets only future associations are effected
2505 * by the change). With TCP-style sockets, this option is inherited by
2506 * sockets derived from a listener socket.
2508 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, int optlen)
2510 struct sctp_initmsg sinit;
2511 struct sctp_sock *sp = sctp_sk(sk);
2513 if (optlen != sizeof(struct sctp_initmsg))
2515 if (copy_from_user(&sinit, optval, optlen))
2518 if (sinit.sinit_num_ostreams)
2519 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2520 if (sinit.sinit_max_instreams)
2521 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2522 if (sinit.sinit_max_attempts)
2523 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2524 if (sinit.sinit_max_init_timeo)
2525 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2531 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2533 * Applications that wish to use the sendto() system call may wish to
2534 * specify a default set of parameters that would normally be supplied
2535 * through the inclusion of ancillary data. This socket option allows
2536 * such an application to set the default sctp_sndrcvinfo structure.
2537 * The application that wishes to use this socket option simply passes
2538 * in to this call the sctp_sndrcvinfo structure defined in Section
2539 * 5.2.2) The input parameters accepted by this call include
2540 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2541 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2542 * to this call if the caller is using the UDP model.
2544 static int sctp_setsockopt_default_send_param(struct sock *sk,
2545 char __user *optval, int optlen)
2547 struct sctp_sndrcvinfo info;
2548 struct sctp_association *asoc;
2549 struct sctp_sock *sp = sctp_sk(sk);
2551 if (optlen != sizeof(struct sctp_sndrcvinfo))
2553 if (copy_from_user(&info, optval, optlen))
2556 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2557 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2561 asoc->default_stream = info.sinfo_stream;
2562 asoc->default_flags = info.sinfo_flags;
2563 asoc->default_ppid = info.sinfo_ppid;
2564 asoc->default_context = info.sinfo_context;
2565 asoc->default_timetolive = info.sinfo_timetolive;
2567 sp->default_stream = info.sinfo_stream;
2568 sp->default_flags = info.sinfo_flags;
2569 sp->default_ppid = info.sinfo_ppid;
2570 sp->default_context = info.sinfo_context;
2571 sp->default_timetolive = info.sinfo_timetolive;
2577 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2579 * Requests that the local SCTP stack use the enclosed peer address as
2580 * the association primary. The enclosed address must be one of the
2581 * association peer's addresses.
2583 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2586 struct sctp_prim prim;
2587 struct sctp_transport *trans;
2589 if (optlen != sizeof(struct sctp_prim))
2592 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2595 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2599 sctp_assoc_set_primary(trans->asoc, trans);
2605 * 7.1.5 SCTP_NODELAY
2607 * Turn on/off any Nagle-like algorithm. This means that packets are
2608 * generally sent as soon as possible and no unnecessary delays are
2609 * introduced, at the cost of more packets in the network. Expects an
2610 * integer boolean flag.
2612 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2617 if (optlen < sizeof(int))
2619 if (get_user(val, (int __user *)optval))
2622 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2628 * 7.1.1 SCTP_RTOINFO
2630 * The protocol parameters used to initialize and bound retransmission
2631 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2632 * and modify these parameters.
2633 * All parameters are time values, in milliseconds. A value of 0, when
2634 * modifying the parameters, indicates that the current value should not
2638 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, int optlen) {
2639 struct sctp_rtoinfo rtoinfo;
2640 struct sctp_association *asoc;
2642 if (optlen != sizeof (struct sctp_rtoinfo))
2645 if (copy_from_user(&rtoinfo, optval, optlen))
2648 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2650 /* Set the values to the specific association */
2651 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2655 if (rtoinfo.srto_initial != 0)
2657 msecs_to_jiffies(rtoinfo.srto_initial);
2658 if (rtoinfo.srto_max != 0)
2659 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2660 if (rtoinfo.srto_min != 0)
2661 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2663 /* If there is no association or the association-id = 0
2664 * set the values to the endpoint.
2666 struct sctp_sock *sp = sctp_sk(sk);
2668 if (rtoinfo.srto_initial != 0)
2669 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2670 if (rtoinfo.srto_max != 0)
2671 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2672 if (rtoinfo.srto_min != 0)
2673 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2681 * 7.1.2 SCTP_ASSOCINFO
2683 * This option is used to tune the maximum retransmission attempts
2684 * of the association.
2685 * Returns an error if the new association retransmission value is
2686 * greater than the sum of the retransmission value of the peer.
2687 * See [SCTP] for more information.
2690 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int optlen)
2693 struct sctp_assocparams assocparams;
2694 struct sctp_association *asoc;
2696 if (optlen != sizeof(struct sctp_assocparams))
2698 if (copy_from_user(&assocparams, optval, optlen))
2701 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2703 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2706 /* Set the values to the specific association */
2708 if (assocparams.sasoc_asocmaxrxt != 0) {
2711 struct sctp_transport *peer_addr;
2713 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2715 path_sum += peer_addr->pathmaxrxt;
2719 /* Only validate asocmaxrxt if we have more then
2720 * one path/transport. We do this because path
2721 * retransmissions are only counted when we have more
2725 assocparams.sasoc_asocmaxrxt > path_sum)
2728 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2731 if (assocparams.sasoc_cookie_life != 0) {
2732 asoc->cookie_life.tv_sec =
2733 assocparams.sasoc_cookie_life / 1000;
2734 asoc->cookie_life.tv_usec =
2735 (assocparams.sasoc_cookie_life % 1000)
2739 /* Set the values to the endpoint */
2740 struct sctp_sock *sp = sctp_sk(sk);
2742 if (assocparams.sasoc_asocmaxrxt != 0)
2743 sp->assocparams.sasoc_asocmaxrxt =
2744 assocparams.sasoc_asocmaxrxt;
2745 if (assocparams.sasoc_cookie_life != 0)
2746 sp->assocparams.sasoc_cookie_life =
2747 assocparams.sasoc_cookie_life;
2753 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2755 * This socket option is a boolean flag which turns on or off mapped V4
2756 * addresses. If this option is turned on and the socket is type
2757 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2758 * If this option is turned off, then no mapping will be done of V4
2759 * addresses and a user will receive both PF_INET6 and PF_INET type
2760 * addresses on the socket.
2762 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, int optlen)
2765 struct sctp_sock *sp = sctp_sk(sk);
2767 if (optlen < sizeof(int))
2769 if (get_user(val, (int __user *)optval))
2780 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
2782 * This socket option specifies the maximum size to put in any outgoing
2783 * SCTP chunk. If a message is larger than this size it will be
2784 * fragmented by SCTP into the specified size. Note that the underlying
2785 * SCTP implementation may fragment into smaller sized chunks when the
2786 * PMTU of the underlying association is smaller than the value set by
2789 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optlen)
2791 struct sctp_association *asoc;
2792 struct sctp_sock *sp = sctp_sk(sk);
2795 if (optlen < sizeof(int))
2797 if (get_user(val, (int __user *)optval))
2799 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2801 sp->user_frag = val;
2803 /* Update the frag_point of the existing associations. */
2804 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
2805 asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
2813 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2815 * Requests that the peer mark the enclosed address as the association
2816 * primary. The enclosed address must be one of the association's
2817 * locally bound addresses. The following structure is used to make a
2818 * set primary request:
2820 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2823 struct sctp_sock *sp;
2824 struct sctp_endpoint *ep;
2825 struct sctp_association *asoc = NULL;
2826 struct sctp_setpeerprim prim;
2827 struct sctp_chunk *chunk;
2833 if (!sctp_addip_enable)
2836 if (optlen != sizeof(struct sctp_setpeerprim))
2839 if (copy_from_user(&prim, optval, optlen))
2842 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2846 if (!asoc->peer.asconf_capable)
2849 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2852 if (!sctp_state(asoc, ESTABLISHED))
2855 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2856 return -EADDRNOTAVAIL;
2858 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2859 chunk = sctp_make_asconf_set_prim(asoc,
2860 (union sctp_addr *)&prim.sspp_addr);
2864 err = sctp_send_asconf(asoc, chunk);
2866 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2871 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2874 struct sctp_setadaptation adaptation;
2876 if (optlen != sizeof(struct sctp_setadaptation))
2878 if (copy_from_user(&adaptation, optval, optlen))
2881 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
2887 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2889 * The context field in the sctp_sndrcvinfo structure is normally only
2890 * used when a failed message is retrieved holding the value that was
2891 * sent down on the actual send call. This option allows the setting of
2892 * a default context on an association basis that will be received on
2893 * reading messages from the peer. This is especially helpful in the
2894 * one-2-many model for an application to keep some reference to an
2895 * internal state machine that is processing messages on the
2896 * association. Note that the setting of this value only effects
2897 * received messages from the peer and does not effect the value that is
2898 * saved with outbound messages.
2900 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
2903 struct sctp_assoc_value params;
2904 struct sctp_sock *sp;
2905 struct sctp_association *asoc;
2907 if (optlen != sizeof(struct sctp_assoc_value))
2909 if (copy_from_user(¶ms, optval, optlen))
2914 if (params.assoc_id != 0) {
2915 asoc = sctp_id2assoc(sk, params.assoc_id);
2918 asoc->default_rcv_context = params.assoc_value;
2920 sp->default_rcv_context = params.assoc_value;
2927 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2929 * This options will at a minimum specify if the implementation is doing
2930 * fragmented interleave. Fragmented interleave, for a one to many
2931 * socket, is when subsequent calls to receive a message may return
2932 * parts of messages from different associations. Some implementations
2933 * may allow you to turn this value on or off. If so, when turned off,
2934 * no fragment interleave will occur (which will cause a head of line
2935 * blocking amongst multiple associations sharing the same one to many
2936 * socket). When this option is turned on, then each receive call may
2937 * come from a different association (thus the user must receive data
2938 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2939 * association each receive belongs to.
2941 * This option takes a boolean value. A non-zero value indicates that
2942 * fragmented interleave is on. A value of zero indicates that
2943 * fragmented interleave is off.
2945 * Note that it is important that an implementation that allows this
2946 * option to be turned on, have it off by default. Otherwise an unaware
2947 * application using the one to many model may become confused and act
2950 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
2951 char __user *optval,
2956 if (optlen != sizeof(int))
2958 if (get_user(val, (int __user *)optval))
2961 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
2967 * 7.1.25. Set or Get the sctp partial delivery point
2968 * (SCTP_PARTIAL_DELIVERY_POINT)
2969 * This option will set or get the SCTP partial delivery point. This
2970 * point is the size of a message where the partial delivery API will be
2971 * invoked to help free up rwnd space for the peer. Setting this to a
2972 * lower value will cause partial delivery's to happen more often. The
2973 * calls argument is an integer that sets or gets the partial delivery
2976 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
2977 char __user *optval,
2982 if (optlen != sizeof(u32))
2984 if (get_user(val, (int __user *)optval))
2987 sctp_sk(sk)->pd_point = val;
2989 return 0; /* is this the right error code? */
2993 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
2995 * This option will allow a user to change the maximum burst of packets
2996 * that can be emitted by this association. Note that the default value
2997 * is 4, and some implementations may restrict this setting so that it
2998 * can only be lowered.
3000 * NOTE: This text doesn't seem right. Do this on a socket basis with
3001 * future associations inheriting the socket value.
3003 static int sctp_setsockopt_maxburst(struct sock *sk,
3004 char __user *optval,
3007 struct sctp_assoc_value params;
3008 struct sctp_sock *sp;
3009 struct sctp_association *asoc;
3013 if (optlen < sizeof(int))
3016 if (optlen == sizeof(int)) {
3018 "SCTP: Use of int in max_burst socket option deprecated\n");
3020 "SCTP: Use struct sctp_assoc_value instead\n");
3021 if (copy_from_user(&val, optval, optlen))
3023 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3024 if (copy_from_user(¶ms, optval, optlen))
3026 val = params.assoc_value;
3027 assoc_id = params.assoc_id;
3033 if (assoc_id != 0) {
3034 asoc = sctp_id2assoc(sk, assoc_id);
3037 asoc->max_burst = val;
3039 sp->max_burst = val;
3045 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3047 * This set option adds a chunk type that the user is requesting to be
3048 * received only in an authenticated way. Changes to the list of chunks
3049 * will only effect future associations on the socket.
3051 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3052 char __user *optval,
3055 struct sctp_authchunk val;
3057 if (optlen != sizeof(struct sctp_authchunk))
3059 if (copy_from_user(&val, optval, optlen))
3062 switch (val.sauth_chunk) {
3064 case SCTP_CID_INIT_ACK:
3065 case SCTP_CID_SHUTDOWN_COMPLETE:
3070 /* add this chunk id to the endpoint */
3071 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3075 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3077 * This option gets or sets the list of HMAC algorithms that the local
3078 * endpoint requires the peer to use.
3080 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3081 char __user *optval,
3084 struct sctp_hmacalgo *hmacs;
3087 if (optlen < sizeof(struct sctp_hmacalgo))
3090 hmacs = kmalloc(optlen, GFP_KERNEL);
3094 if (copy_from_user(hmacs, optval, optlen)) {
3099 if (hmacs->shmac_num_idents == 0 ||
3100 hmacs->shmac_num_idents > SCTP_AUTH_NUM_HMACS) {
3105 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3112 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3114 * This option will set a shared secret key which is used to build an
3115 * association shared key.
3117 static int sctp_setsockopt_auth_key(struct sock *sk,
3118 char __user *optval,
3121 struct sctp_authkey *authkey;
3122 struct sctp_association *asoc;
3125 if (optlen <= sizeof(struct sctp_authkey))
3128 authkey = kmalloc(optlen, GFP_KERNEL);
3132 if (copy_from_user(authkey, optval, optlen)) {
3137 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3138 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3143 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3150 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3152 * This option will get or set the active shared key to be used to build
3153 * the association shared key.
3155 static int sctp_setsockopt_active_key(struct sock *sk,
3156 char __user *optval,
3159 struct sctp_authkeyid val;
3160 struct sctp_association *asoc;
3162 if (optlen != sizeof(struct sctp_authkeyid))
3164 if (copy_from_user(&val, optval, optlen))
3167 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3168 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3171 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3172 val.scact_keynumber);
3176 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3178 * This set option will delete a shared secret key from use.
3180 static int sctp_setsockopt_del_key(struct sock *sk,
3181 char __user *optval,
3184 struct sctp_authkeyid val;
3185 struct sctp_association *asoc;
3187 if (optlen != sizeof(struct sctp_authkeyid))
3189 if (copy_from_user(&val, optval, optlen))
3192 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3193 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3196 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3197 val.scact_keynumber);
3202 /* API 6.2 setsockopt(), getsockopt()
3204 * Applications use setsockopt() and getsockopt() to set or retrieve
3205 * socket options. Socket options are used to change the default
3206 * behavior of sockets calls. They are described in Section 7.
3210 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3211 * int __user *optlen);
3212 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3215 * sd - the socket descript.
3216 * level - set to IPPROTO_SCTP for all SCTP options.
3217 * optname - the option name.
3218 * optval - the buffer to store the value of the option.
3219 * optlen - the size of the buffer.
3221 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3222 char __user *optval, int optlen)
3226 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3229 /* I can hardly begin to describe how wrong this is. This is
3230 * so broken as to be worse than useless. The API draft
3231 * REALLY is NOT helpful here... I am not convinced that the
3232 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3233 * are at all well-founded.
3235 if (level != SOL_SCTP) {
3236 struct sctp_af *af = sctp_sk(sk)->pf->af;
3237 retval = af->setsockopt(sk, level, optname, optval, optlen);
3244 case SCTP_SOCKOPT_BINDX_ADD:
3245 /* 'optlen' is the size of the addresses buffer. */
3246 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3247 optlen, SCTP_BINDX_ADD_ADDR);
3250 case SCTP_SOCKOPT_BINDX_REM:
3251 /* 'optlen' is the size of the addresses buffer. */
3252 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3253 optlen, SCTP_BINDX_REM_ADDR);
3256 case SCTP_SOCKOPT_CONNECTX_OLD:
3257 /* 'optlen' is the size of the addresses buffer. */
3258 retval = sctp_setsockopt_connectx_old(sk,
3259 (struct sockaddr __user *)optval,
3263 case SCTP_SOCKOPT_CONNECTX:
3264 /* 'optlen' is the size of the addresses buffer. */
3265 retval = sctp_setsockopt_connectx(sk,
3266 (struct sockaddr __user *)optval,
3270 case SCTP_DISABLE_FRAGMENTS:
3271 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3275 retval = sctp_setsockopt_events(sk, optval, optlen);
3278 case SCTP_AUTOCLOSE:
3279 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3282 case SCTP_PEER_ADDR_PARAMS:
3283 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3286 case SCTP_DELAYED_ACK:
3287 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3289 case SCTP_PARTIAL_DELIVERY_POINT:
3290 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3294 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3296 case SCTP_DEFAULT_SEND_PARAM:
3297 retval = sctp_setsockopt_default_send_param(sk, optval,
3300 case SCTP_PRIMARY_ADDR:
3301 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3303 case SCTP_SET_PEER_PRIMARY_ADDR:
3304 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3307 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3310 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3312 case SCTP_ASSOCINFO:
3313 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3315 case SCTP_I_WANT_MAPPED_V4_ADDR:
3316 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3319 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3321 case SCTP_ADAPTATION_LAYER:
3322 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3325 retval = sctp_setsockopt_context(sk, optval, optlen);
3327 case SCTP_FRAGMENT_INTERLEAVE:
3328 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3330 case SCTP_MAX_BURST:
3331 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3333 case SCTP_AUTH_CHUNK:
3334 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3336 case SCTP_HMAC_IDENT:
3337 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3340 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3342 case SCTP_AUTH_ACTIVE_KEY:
3343 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3345 case SCTP_AUTH_DELETE_KEY:
3346 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3349 retval = -ENOPROTOOPT;
3353 sctp_release_sock(sk);
3359 /* API 3.1.6 connect() - UDP Style Syntax
3361 * An application may use the connect() call in the UDP model to initiate an
3362 * association without sending data.
3366 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3368 * sd: the socket descriptor to have a new association added to.
3370 * nam: the address structure (either struct sockaddr_in or struct
3371 * sockaddr_in6 defined in RFC2553 [7]).
3373 * len: the size of the address.
3375 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3383 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3384 __func__, sk, addr, addr_len);
3386 /* Validate addr_len before calling common connect/connectx routine. */
3387 af = sctp_get_af_specific(addr->sa_family);
3388 if (!af || addr_len < af->sockaddr_len) {
3391 /* Pass correct addr len to common routine (so it knows there
3392 * is only one address being passed.
3394 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3397 sctp_release_sock(sk);
3401 /* FIXME: Write comments. */
3402 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3404 return -EOPNOTSUPP; /* STUB */
3407 /* 4.1.4 accept() - TCP Style Syntax
3409 * Applications use accept() call to remove an established SCTP
3410 * association from the accept queue of the endpoint. A new socket
3411 * descriptor will be returned from accept() to represent the newly
3412 * formed association.
3414 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3416 struct sctp_sock *sp;
3417 struct sctp_endpoint *ep;
3418 struct sock *newsk = NULL;
3419 struct sctp_association *asoc;
3428 if (!sctp_style(sk, TCP)) {
3429 error = -EOPNOTSUPP;
3433 if (!sctp_sstate(sk, LISTENING)) {
3438 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3440 error = sctp_wait_for_accept(sk, timeo);
3444 /* We treat the list of associations on the endpoint as the accept
3445 * queue and pick the first association on the list.
3447 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3449 newsk = sp->pf->create_accept_sk(sk, asoc);
3455 /* Populate the fields of the newsk from the oldsk and migrate the
3456 * asoc to the newsk.
3458 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3461 sctp_release_sock(sk);
3466 /* The SCTP ioctl handler. */
3467 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3469 return -ENOIOCTLCMD;
3472 /* This is the function which gets called during socket creation to
3473 * initialized the SCTP-specific portion of the sock.
3474 * The sock structure should already be zero-filled memory.
3476 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3478 struct sctp_endpoint *ep;
3479 struct sctp_sock *sp;
3481 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3485 /* Initialize the SCTP per socket area. */
3486 switch (sk->sk_type) {
3487 case SOCK_SEQPACKET:
3488 sp->type = SCTP_SOCKET_UDP;
3491 sp->type = SCTP_SOCKET_TCP;
3494 return -ESOCKTNOSUPPORT;
3497 /* Initialize default send parameters. These parameters can be
3498 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3500 sp->default_stream = 0;
3501 sp->default_ppid = 0;
3502 sp->default_flags = 0;
3503 sp->default_context = 0;
3504 sp->default_timetolive = 0;
3506 sp->default_rcv_context = 0;
3507 sp->max_burst = sctp_max_burst;
3509 /* Initialize default setup parameters. These parameters
3510 * can be modified with the SCTP_INITMSG socket option or
3511 * overridden by the SCTP_INIT CMSG.
3513 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3514 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3515 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3516 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3518 /* Initialize default RTO related parameters. These parameters can
3519 * be modified for with the SCTP_RTOINFO socket option.
3521 sp->rtoinfo.srto_initial = sctp_rto_initial;
3522 sp->rtoinfo.srto_max = sctp_rto_max;
3523 sp->rtoinfo.srto_min = sctp_rto_min;
3525 /* Initialize default association related parameters. These parameters
3526 * can be modified with the SCTP_ASSOCINFO socket option.
3528 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3529 sp->assocparams.sasoc_number_peer_destinations = 0;
3530 sp->assocparams.sasoc_peer_rwnd = 0;
3531 sp->assocparams.sasoc_local_rwnd = 0;
3532 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3534 /* Initialize default event subscriptions. By default, all the
3537 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3539 /* Default Peer Address Parameters. These defaults can
3540 * be modified via SCTP_PEER_ADDR_PARAMS
3542 sp->hbinterval = sctp_hb_interval;
3543 sp->pathmaxrxt = sctp_max_retrans_path;
3544 sp->pathmtu = 0; // allow default discovery
3545 sp->sackdelay = sctp_sack_timeout;
3547 sp->param_flags = SPP_HB_ENABLE |
3549 SPP_SACKDELAY_ENABLE;
3551 /* If enabled no SCTP message fragmentation will be performed.
3552 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3554 sp->disable_fragments = 0;
3556 /* Enable Nagle algorithm by default. */
3559 /* Enable by default. */
3562 /* Auto-close idle associations after the configured
3563 * number of seconds. A value of 0 disables this
3564 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3565 * for UDP-style sockets only.
3569 /* User specified fragmentation limit. */
3572 sp->adaptation_ind = 0;
3574 sp->pf = sctp_get_pf_specific(sk->sk_family);
3576 /* Control variables for partial data delivery. */
3577 atomic_set(&sp->pd_mode, 0);
3578 skb_queue_head_init(&sp->pd_lobby);
3579 sp->frag_interleave = 0;
3581 /* Create a per socket endpoint structure. Even if we
3582 * change the data structure relationships, this may still
3583 * be useful for storing pre-connect address information.
3585 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3592 SCTP_DBG_OBJCNT_INC(sock);
3593 atomic_inc(&sctp_sockets_allocated);
3597 /* Cleanup any SCTP per socket resources. */
3598 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3600 struct sctp_endpoint *ep;
3602 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3604 /* Release our hold on the endpoint. */
3605 ep = sctp_sk(sk)->ep;
3606 sctp_endpoint_free(ep);
3607 atomic_dec(&sctp_sockets_allocated);
3610 /* API 4.1.7 shutdown() - TCP Style Syntax
3611 * int shutdown(int socket, int how);
3613 * sd - the socket descriptor of the association to be closed.
3614 * how - Specifies the type of shutdown. The values are
3617 * Disables further receive operations. No SCTP
3618 * protocol action is taken.
3620 * Disables further send operations, and initiates
3621 * the SCTP shutdown sequence.
3623 * Disables further send and receive operations
3624 * and initiates the SCTP shutdown sequence.
3626 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3628 struct sctp_endpoint *ep;
3629 struct sctp_association *asoc;
3631 if (!sctp_style(sk, TCP))
3634 if (how & SEND_SHUTDOWN) {
3635 ep = sctp_sk(sk)->ep;
3636 if (!list_empty(&ep->asocs)) {
3637 asoc = list_entry(ep->asocs.next,
3638 struct sctp_association, asocs);
3639 sctp_primitive_SHUTDOWN(asoc, NULL);
3644 /* 7.2.1 Association Status (SCTP_STATUS)
3646 * Applications can retrieve current status information about an
3647 * association, including association state, peer receiver window size,
3648 * number of unacked data chunks, and number of data chunks pending
3649 * receipt. This information is read-only.
3651 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3652 char __user *optval,
3655 struct sctp_status status;
3656 struct sctp_association *asoc = NULL;
3657 struct sctp_transport *transport;
3658 sctp_assoc_t associd;
3661 if (len < sizeof(status)) {
3666 len = sizeof(status);
3667 if (copy_from_user(&status, optval, len)) {
3672 associd = status.sstat_assoc_id;
3673 asoc = sctp_id2assoc(sk, associd);
3679 transport = asoc->peer.primary_path;
3681 status.sstat_assoc_id = sctp_assoc2id(asoc);
3682 status.sstat_state = asoc->state;
3683 status.sstat_rwnd = asoc->peer.rwnd;
3684 status.sstat_unackdata = asoc->unack_data;
3686 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3687 status.sstat_instrms = asoc->c.sinit_max_instreams;
3688 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3689 status.sstat_fragmentation_point = asoc->frag_point;
3690 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3691 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3692 transport->af_specific->sockaddr_len);
3693 /* Map ipv4 address into v4-mapped-on-v6 address. */
3694 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3695 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3696 status.sstat_primary.spinfo_state = transport->state;
3697 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3698 status.sstat_primary.spinfo_srtt = transport->srtt;
3699 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3700 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3702 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3703 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3705 if (put_user(len, optlen)) {
3710 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3711 len, status.sstat_state, status.sstat_rwnd,
3712 status.sstat_assoc_id);
3714 if (copy_to_user(optval, &status, len)) {
3724 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3726 * Applications can retrieve information about a specific peer address
3727 * of an association, including its reachability state, congestion
3728 * window, and retransmission timer values. This information is
3731 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3732 char __user *optval,
3735 struct sctp_paddrinfo pinfo;
3736 struct sctp_transport *transport;
3739 if (len < sizeof(pinfo)) {
3744 len = sizeof(pinfo);
3745 if (copy_from_user(&pinfo, optval, len)) {
3750 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3751 pinfo.spinfo_assoc_id);
3755 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3756 pinfo.spinfo_state = transport->state;
3757 pinfo.spinfo_cwnd = transport->cwnd;
3758 pinfo.spinfo_srtt = transport->srtt;
3759 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3760 pinfo.spinfo_mtu = transport->pathmtu;
3762 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3763 pinfo.spinfo_state = SCTP_ACTIVE;
3765 if (put_user(len, optlen)) {
3770 if (copy_to_user(optval, &pinfo, len)) {
3779 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3781 * This option is a on/off flag. If enabled no SCTP message
3782 * fragmentation will be performed. Instead if a message being sent
3783 * exceeds the current PMTU size, the message will NOT be sent and
3784 * instead a error will be indicated to the user.
3786 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3787 char __user *optval, int __user *optlen)
3791 if (len < sizeof(int))
3795 val = (sctp_sk(sk)->disable_fragments == 1);
3796 if (put_user(len, optlen))
3798 if (copy_to_user(optval, &val, len))
3803 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3805 * This socket option is used to specify various notifications and
3806 * ancillary data the user wishes to receive.
3808 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3811 if (len < sizeof(struct sctp_event_subscribe))
3813 len = sizeof(struct sctp_event_subscribe);
3814 if (put_user(len, optlen))
3816 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3821 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3823 * This socket option is applicable to the UDP-style socket only. When
3824 * set it will cause associations that are idle for more than the
3825 * specified number of seconds to automatically close. An association
3826 * being idle is defined an association that has NOT sent or received
3827 * user data. The special value of '0' indicates that no automatic
3828 * close of any associations should be performed. The option expects an
3829 * integer defining the number of seconds of idle time before an
3830 * association is closed.
3832 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3834 /* Applicable to UDP-style socket only */
3835 if (sctp_style(sk, TCP))
3837 if (len < sizeof(int))
3840 if (put_user(len, optlen))
3842 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
3847 /* Helper routine to branch off an association to a new socket. */
3848 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3849 struct socket **sockp)
3851 struct sock *sk = asoc->base.sk;
3852 struct socket *sock;
3853 struct inet_sock *inetsk;
3857 /* An association cannot be branched off from an already peeled-off
3858 * socket, nor is this supported for tcp style sockets.
3860 if (!sctp_style(sk, UDP))
3863 /* Create a new socket. */
3864 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
3868 /* Populate the fields of the newsk from the oldsk and migrate the
3869 * asoc to the newsk.
3871 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
3873 /* Make peeled-off sockets more like 1-1 accepted sockets.
3874 * Set the daddr and initialize id to something more random
3876 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
3877 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
3878 inetsk = inet_sk(sock->sk);
3879 inetsk->id = asoc->next_tsn ^ jiffies;
3886 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
3888 sctp_peeloff_arg_t peeloff;
3889 struct socket *newsock;
3891 struct sctp_association *asoc;
3893 if (len < sizeof(sctp_peeloff_arg_t))
3895 len = sizeof(sctp_peeloff_arg_t);
3896 if (copy_from_user(&peeloff, optval, len))
3899 asoc = sctp_id2assoc(sk, peeloff.associd);
3905 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
3907 retval = sctp_do_peeloff(asoc, &newsock);
3911 /* Map the socket to an unused fd that can be returned to the user. */
3912 retval = sock_map_fd(newsock);
3914 sock_release(newsock);
3918 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
3919 __func__, sk, asoc, newsock->sk, retval);
3921 /* Return the fd mapped to the new socket. */
3922 peeloff.sd = retval;
3923 if (put_user(len, optlen))
3925 if (copy_to_user(optval, &peeloff, len))
3932 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
3934 * Applications can enable or disable heartbeats for any peer address of
3935 * an association, modify an address's heartbeat interval, force a
3936 * heartbeat to be sent immediately, and adjust the address's maximum
3937 * number of retransmissions sent before an address is considered
3938 * unreachable. The following structure is used to access and modify an
3939 * address's parameters:
3941 * struct sctp_paddrparams {
3942 * sctp_assoc_t spp_assoc_id;
3943 * struct sockaddr_storage spp_address;
3944 * uint32_t spp_hbinterval;
3945 * uint16_t spp_pathmaxrxt;
3946 * uint32_t spp_pathmtu;
3947 * uint32_t spp_sackdelay;
3948 * uint32_t spp_flags;
3951 * spp_assoc_id - (one-to-many style socket) This is filled in the
3952 * application, and identifies the association for
3954 * spp_address - This specifies which address is of interest.
3955 * spp_hbinterval - This contains the value of the heartbeat interval,
3956 * in milliseconds. If a value of zero
3957 * is present in this field then no changes are to
3958 * be made to this parameter.
3959 * spp_pathmaxrxt - This contains the maximum number of
3960 * retransmissions before this address shall be
3961 * considered unreachable. If a value of zero
3962 * is present in this field then no changes are to
3963 * be made to this parameter.
3964 * spp_pathmtu - When Path MTU discovery is disabled the value
3965 * specified here will be the "fixed" path mtu.
3966 * Note that if the spp_address field is empty
3967 * then all associations on this address will
3968 * have this fixed path mtu set upon them.
3970 * spp_sackdelay - When delayed sack is enabled, this value specifies
3971 * the number of milliseconds that sacks will be delayed
3972 * for. This value will apply to all addresses of an
3973 * association if the spp_address field is empty. Note
3974 * also, that if delayed sack is enabled and this
3975 * value is set to 0, no change is made to the last
3976 * recorded delayed sack timer value.
3978 * spp_flags - These flags are used to control various features
3979 * on an association. The flag field may contain
3980 * zero or more of the following options.
3982 * SPP_HB_ENABLE - Enable heartbeats on the
3983 * specified address. Note that if the address
3984 * field is empty all addresses for the association
3985 * have heartbeats enabled upon them.
3987 * SPP_HB_DISABLE - Disable heartbeats on the
3988 * speicifed address. Note that if the address
3989 * field is empty all addresses for the association
3990 * will have their heartbeats disabled. Note also
3991 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
3992 * mutually exclusive, only one of these two should
3993 * be specified. Enabling both fields will have
3994 * undetermined results.
3996 * SPP_HB_DEMAND - Request a user initiated heartbeat
3997 * to be made immediately.
3999 * SPP_PMTUD_ENABLE - This field will enable PMTU
4000 * discovery upon the specified address. Note that
4001 * if the address feild is empty then all addresses
4002 * on the association are effected.
4004 * SPP_PMTUD_DISABLE - This field will disable PMTU
4005 * discovery upon the specified address. Note that
4006 * if the address feild is empty then all addresses
4007 * on the association are effected. Not also that
4008 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4009 * exclusive. Enabling both will have undetermined
4012 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4013 * on delayed sack. The time specified in spp_sackdelay
4014 * is used to specify the sack delay for this address. Note
4015 * that if spp_address is empty then all addresses will
4016 * enable delayed sack and take on the sack delay
4017 * value specified in spp_sackdelay.
4018 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4019 * off delayed sack. If the spp_address field is blank then
4020 * delayed sack is disabled for the entire association. Note
4021 * also that this field is mutually exclusive to
4022 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4025 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4026 char __user *optval, int __user *optlen)
4028 struct sctp_paddrparams params;
4029 struct sctp_transport *trans = NULL;
4030 struct sctp_association *asoc = NULL;
4031 struct sctp_sock *sp = sctp_sk(sk);
4033 if (len < sizeof(struct sctp_paddrparams))
4035 len = sizeof(struct sctp_paddrparams);
4036 if (copy_from_user(¶ms, optval, len))
4039 /* If an address other than INADDR_ANY is specified, and
4040 * no transport is found, then the request is invalid.
4042 if (!sctp_is_any(( union sctp_addr *)¶ms.spp_address)) {
4043 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4044 params.spp_assoc_id);
4046 SCTP_DEBUG_PRINTK("Failed no transport\n");
4051 /* Get association, if assoc_id != 0 and the socket is a one
4052 * to many style socket, and an association was not found, then
4053 * the id was invalid.
4055 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4056 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4057 SCTP_DEBUG_PRINTK("Failed no association\n");
4062 /* Fetch transport values. */
4063 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4064 params.spp_pathmtu = trans->pathmtu;
4065 params.spp_pathmaxrxt = trans->pathmaxrxt;
4066 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4068 /*draft-11 doesn't say what to return in spp_flags*/
4069 params.spp_flags = trans->param_flags;
4071 /* Fetch association values. */
4072 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4073 params.spp_pathmtu = asoc->pathmtu;
4074 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4075 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4077 /*draft-11 doesn't say what to return in spp_flags*/
4078 params.spp_flags = asoc->param_flags;
4080 /* Fetch socket values. */
4081 params.spp_hbinterval = sp->hbinterval;
4082 params.spp_pathmtu = sp->pathmtu;
4083 params.spp_sackdelay = sp->sackdelay;
4084 params.spp_pathmaxrxt = sp->pathmaxrxt;
4086 /*draft-11 doesn't say what to return in spp_flags*/
4087 params.spp_flags = sp->param_flags;
4090 if (copy_to_user(optval, ¶ms, len))
4093 if (put_user(len, optlen))
4100 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4102 * This option will effect the way delayed acks are performed. This
4103 * option allows you to get or set the delayed ack time, in
4104 * milliseconds. It also allows changing the delayed ack frequency.
4105 * Changing the frequency to 1 disables the delayed sack algorithm. If
4106 * the assoc_id is 0, then this sets or gets the endpoints default
4107 * values. If the assoc_id field is non-zero, then the set or get
4108 * effects the specified association for the one to many model (the
4109 * assoc_id field is ignored by the one to one model). Note that if
4110 * sack_delay or sack_freq are 0 when setting this option, then the
4111 * current values will remain unchanged.
4113 * struct sctp_sack_info {
4114 * sctp_assoc_t sack_assoc_id;
4115 * uint32_t sack_delay;
4116 * uint32_t sack_freq;
4119 * sack_assoc_id - This parameter, indicates which association the user
4120 * is performing an action upon. Note that if this field's value is
4121 * zero then the endpoints default value is changed (effecting future
4122 * associations only).
4124 * sack_delay - This parameter contains the number of milliseconds that
4125 * the user is requesting the delayed ACK timer be set to. Note that
4126 * this value is defined in the standard to be between 200 and 500
4129 * sack_freq - This parameter contains the number of packets that must
4130 * be received before a sack is sent without waiting for the delay
4131 * timer to expire. The default value for this is 2, setting this
4132 * value to 1 will disable the delayed sack algorithm.
4134 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4135 char __user *optval,
4138 struct sctp_sack_info params;
4139 struct sctp_association *asoc = NULL;
4140 struct sctp_sock *sp = sctp_sk(sk);
4142 if (len >= sizeof(struct sctp_sack_info)) {
4143 len = sizeof(struct sctp_sack_info);
4145 if (copy_from_user(¶ms, optval, len))
4147 } else if (len == sizeof(struct sctp_assoc_value)) {
4148 printk(KERN_WARNING "SCTP: Use of struct sctp_sack_info "
4149 "in delayed_ack socket option deprecated\n");
4150 printk(KERN_WARNING "SCTP: struct sctp_sack_info instead\n");
4151 if (copy_from_user(¶ms, optval, len))
4156 /* Get association, if sack_assoc_id != 0 and the socket is a one
4157 * to many style socket, and an association was not found, then
4158 * the id was invalid.
4160 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4161 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4165 /* Fetch association values. */
4166 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4167 params.sack_delay = jiffies_to_msecs(
4169 params.sack_freq = asoc->sackfreq;
4172 params.sack_delay = 0;
4173 params.sack_freq = 1;
4176 /* Fetch socket values. */
4177 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4178 params.sack_delay = sp->sackdelay;
4179 params.sack_freq = sp->sackfreq;
4181 params.sack_delay = 0;
4182 params.sack_freq = 1;
4186 if (copy_to_user(optval, ¶ms, len))
4189 if (put_user(len, optlen))
4195 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4197 * Applications can specify protocol parameters for the default association
4198 * initialization. The option name argument to setsockopt() and getsockopt()
4201 * Setting initialization parameters is effective only on an unconnected
4202 * socket (for UDP-style sockets only future associations are effected
4203 * by the change). With TCP-style sockets, this option is inherited by
4204 * sockets derived from a listener socket.
4206 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4208 if (len < sizeof(struct sctp_initmsg))
4210 len = sizeof(struct sctp_initmsg);
4211 if (put_user(len, optlen))
4213 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4218 static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
4219 char __user *optval,
4223 struct sctp_association *asoc;
4224 struct list_head *pos;
4227 if (len < sizeof(sctp_assoc_t))
4230 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4233 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_NUM_OLD "
4234 "socket option deprecated\n");
4235 /* For UDP-style sockets, id specifies the association to query. */
4236 asoc = sctp_id2assoc(sk, id);
4240 list_for_each(pos, &asoc->peer.transport_addr_list) {
4248 * Old API for getting list of peer addresses. Does not work for 32-bit
4249 * programs running on a 64-bit kernel
4251 static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
4252 char __user *optval,
4255 struct sctp_association *asoc;
4257 struct sctp_getaddrs_old getaddrs;
4258 struct sctp_transport *from;
4260 union sctp_addr temp;
4261 struct sctp_sock *sp = sctp_sk(sk);
4264 if (len < sizeof(struct sctp_getaddrs_old))
4267 len = sizeof(struct sctp_getaddrs_old);
4269 if (copy_from_user(&getaddrs, optval, len))
4272 if (getaddrs.addr_num <= 0) return -EINVAL;
4274 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_OLD "
4275 "socket option deprecated\n");
4277 /* For UDP-style sockets, id specifies the association to query. */
4278 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4282 to = (void __user *)getaddrs.addrs;
4283 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4285 memcpy(&temp, &from->ipaddr, sizeof(temp));
4286 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4287 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4288 if (copy_to_user(to, &temp, addrlen))
4292 if (cnt >= getaddrs.addr_num) break;
4294 getaddrs.addr_num = cnt;
4295 if (put_user(len, optlen))
4297 if (copy_to_user(optval, &getaddrs, len))
4303 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4304 char __user *optval, int __user *optlen)
4306 struct sctp_association *asoc;
4308 struct sctp_getaddrs getaddrs;
4309 struct sctp_transport *from;
4311 union sctp_addr temp;
4312 struct sctp_sock *sp = sctp_sk(sk);
4317 if (len < sizeof(struct sctp_getaddrs))
4320 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4323 /* For UDP-style sockets, id specifies the association to query. */
4324 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4328 to = optval + offsetof(struct sctp_getaddrs,addrs);
4329 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4331 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4333 memcpy(&temp, &from->ipaddr, sizeof(temp));
4334 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4335 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4336 if (space_left < addrlen)
4338 if (copy_to_user(to, &temp, addrlen))
4342 space_left -= addrlen;
4345 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4347 bytes_copied = ((char __user *)to) - optval;
4348 if (put_user(bytes_copied, optlen))
4354 static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
4355 char __user *optval,
4359 struct sctp_bind_addr *bp;
4360 struct sctp_association *asoc;
4361 struct sctp_sockaddr_entry *addr;
4364 if (len < sizeof(sctp_assoc_t))
4367 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4370 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_NUM_OLD "
4371 "socket option deprecated\n");
4374 * For UDP-style sockets, id specifies the association to query.
4375 * If the id field is set to the value '0' then the locally bound
4376 * addresses are returned without regard to any particular
4380 bp = &sctp_sk(sk)->ep->base.bind_addr;
4382 asoc = sctp_id2assoc(sk, id);
4385 bp = &asoc->base.bind_addr;
4388 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4389 * addresses from the global local address list.
4391 if (sctp_list_single_entry(&bp->address_list)) {
4392 addr = list_entry(bp->address_list.next,
4393 struct sctp_sockaddr_entry, list);
4394 if (sctp_is_any(&addr->a)) {
4396 list_for_each_entry_rcu(addr,
4397 &sctp_local_addr_list, list) {
4401 if ((PF_INET == sk->sk_family) &&
4402 (AF_INET6 == addr->a.sa.sa_family))
4405 if ((PF_INET6 == sk->sk_family) &&
4406 inet_v6_ipv6only(sk) &&
4407 (AF_INET == addr->a.sa.sa_family))
4419 /* Protection on the bound address list is not needed,
4420 * since in the socket option context we hold the socket lock,
4421 * so there is no way that the bound address list can change.
4423 list_for_each_entry(addr, &bp->address_list, list) {
4430 /* Helper function that copies local addresses to user and returns the number
4431 * of addresses copied.
4433 static int sctp_copy_laddrs_old(struct sock *sk, __u16 port,
4434 int max_addrs, void *to,
4437 struct sctp_sockaddr_entry *addr;
4438 union sctp_addr temp;
4443 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4447 if ((PF_INET == sk->sk_family) &&
4448 (AF_INET6 == addr->a.sa.sa_family))
4450 if ((PF_INET6 == sk->sk_family) &&
4451 inet_v6_ipv6only(sk) &&
4452 (AF_INET == addr->a.sa.sa_family))
4454 memcpy(&temp, &addr->a, sizeof(temp));
4455 if (!temp.v4.sin_port)
4456 temp.v4.sin_port = htons(port);
4458 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4460 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4461 memcpy(to, &temp, addrlen);
4464 *bytes_copied += addrlen;
4466 if (cnt >= max_addrs) break;
4473 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4474 size_t space_left, int *bytes_copied)
4476 struct sctp_sockaddr_entry *addr;
4477 union sctp_addr temp;
4482 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4486 if ((PF_INET == sk->sk_family) &&
4487 (AF_INET6 == addr->a.sa.sa_family))
4489 if ((PF_INET6 == sk->sk_family) &&
4490 inet_v6_ipv6only(sk) &&
4491 (AF_INET == addr->a.sa.sa_family))
4493 memcpy(&temp, &addr->a, sizeof(temp));
4494 if (!temp.v4.sin_port)
4495 temp.v4.sin_port = htons(port);
4497 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4499 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4500 if (space_left < addrlen) {
4504 memcpy(to, &temp, addrlen);
4508 space_left -= addrlen;
4509 *bytes_copied += addrlen;
4516 /* Old API for getting list of local addresses. Does not work for 32-bit
4517 * programs running on a 64-bit kernel
4519 static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
4520 char __user *optval, int __user *optlen)
4522 struct sctp_bind_addr *bp;
4523 struct sctp_association *asoc;
4525 struct sctp_getaddrs_old getaddrs;
4526 struct sctp_sockaddr_entry *addr;
4528 union sctp_addr temp;
4529 struct sctp_sock *sp = sctp_sk(sk);
4534 int bytes_copied = 0;
4536 if (len < sizeof(struct sctp_getaddrs_old))
4539 len = sizeof(struct sctp_getaddrs_old);
4540 if (copy_from_user(&getaddrs, optval, len))
4543 if (getaddrs.addr_num <= 0 ||
4544 getaddrs.addr_num >= (INT_MAX / sizeof(union sctp_addr)))
4547 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_OLD "
4548 "socket option deprecated\n");
4551 * For UDP-style sockets, id specifies the association to query.
4552 * If the id field is set to the value '0' then the locally bound
4553 * addresses are returned without regard to any particular
4556 if (0 == getaddrs.assoc_id) {
4557 bp = &sctp_sk(sk)->ep->base.bind_addr;
4559 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4562 bp = &asoc->base.bind_addr;
4565 to = getaddrs.addrs;
4567 /* Allocate space for a local instance of packed array to hold all
4568 * the data. We store addresses here first and then put write them
4569 * to the user in one shot.
4571 addrs = kmalloc(sizeof(union sctp_addr) * getaddrs.addr_num,
4576 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4577 * addresses from the global local address list.
4579 if (sctp_list_single_entry(&bp->address_list)) {
4580 addr = list_entry(bp->address_list.next,
4581 struct sctp_sockaddr_entry, list);
4582 if (sctp_is_any(&addr->a)) {
4583 cnt = sctp_copy_laddrs_old(sk, bp->port,
4585 addrs, &bytes_copied);
4591 /* Protection on the bound address list is not needed since
4592 * in the socket option context we hold a socket lock and
4593 * thus the bound address list can't change.
4595 list_for_each_entry(addr, &bp->address_list, list) {
4596 memcpy(&temp, &addr->a, sizeof(temp));
4597 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4598 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4599 memcpy(buf, &temp, addrlen);
4601 bytes_copied += addrlen;
4603 if (cnt >= getaddrs.addr_num) break;
4607 /* copy the entire address list into the user provided space */
4608 if (copy_to_user(to, addrs, bytes_copied)) {
4613 /* copy the leading structure back to user */
4614 getaddrs.addr_num = cnt;
4615 if (copy_to_user(optval, &getaddrs, len))
4623 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4624 char __user *optval, int __user *optlen)
4626 struct sctp_bind_addr *bp;
4627 struct sctp_association *asoc;
4629 struct sctp_getaddrs getaddrs;
4630 struct sctp_sockaddr_entry *addr;
4632 union sctp_addr temp;
4633 struct sctp_sock *sp = sctp_sk(sk);
4637 int bytes_copied = 0;
4641 if (len < sizeof(struct sctp_getaddrs))
4644 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4648 * For UDP-style sockets, id specifies the association to query.
4649 * If the id field is set to the value '0' then the locally bound
4650 * addresses are returned without regard to any particular
4653 if (0 == getaddrs.assoc_id) {
4654 bp = &sctp_sk(sk)->ep->base.bind_addr;
4656 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4659 bp = &asoc->base.bind_addr;
4662 to = optval + offsetof(struct sctp_getaddrs,addrs);
4663 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4665 addrs = kmalloc(space_left, GFP_KERNEL);
4669 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4670 * addresses from the global local address list.
4672 if (sctp_list_single_entry(&bp->address_list)) {
4673 addr = list_entry(bp->address_list.next,
4674 struct sctp_sockaddr_entry, list);
4675 if (sctp_is_any(&addr->a)) {
4676 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4677 space_left, &bytes_copied);
4687 /* Protection on the bound address list is not needed since
4688 * in the socket option context we hold a socket lock and
4689 * thus the bound address list can't change.
4691 list_for_each_entry(addr, &bp->address_list, list) {
4692 memcpy(&temp, &addr->a, sizeof(temp));
4693 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4694 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4695 if (space_left < addrlen) {
4696 err = -ENOMEM; /*fixme: right error?*/
4699 memcpy(buf, &temp, addrlen);
4701 bytes_copied += addrlen;
4703 space_left -= addrlen;
4707 if (copy_to_user(to, addrs, bytes_copied)) {
4711 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4715 if (put_user(bytes_copied, optlen))
4722 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4724 * Requests that the local SCTP stack use the enclosed peer address as
4725 * the association primary. The enclosed address must be one of the
4726 * association peer's addresses.
4728 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4729 char __user *optval, int __user *optlen)
4731 struct sctp_prim prim;
4732 struct sctp_association *asoc;
4733 struct sctp_sock *sp = sctp_sk(sk);
4735 if (len < sizeof(struct sctp_prim))
4738 len = sizeof(struct sctp_prim);
4740 if (copy_from_user(&prim, optval, len))
4743 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4747 if (!asoc->peer.primary_path)
4750 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4751 asoc->peer.primary_path->af_specific->sockaddr_len);
4753 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4754 (union sctp_addr *)&prim.ssp_addr);
4756 if (put_user(len, optlen))
4758 if (copy_to_user(optval, &prim, len))
4765 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4767 * Requests that the local endpoint set the specified Adaptation Layer
4768 * Indication parameter for all future INIT and INIT-ACK exchanges.
4770 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4771 char __user *optval, int __user *optlen)
4773 struct sctp_setadaptation adaptation;
4775 if (len < sizeof(struct sctp_setadaptation))
4778 len = sizeof(struct sctp_setadaptation);
4780 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4782 if (put_user(len, optlen))
4784 if (copy_to_user(optval, &adaptation, len))
4792 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4794 * Applications that wish to use the sendto() system call may wish to
4795 * specify a default set of parameters that would normally be supplied
4796 * through the inclusion of ancillary data. This socket option allows
4797 * such an application to set the default sctp_sndrcvinfo structure.
4800 * The application that wishes to use this socket option simply passes
4801 * in to this call the sctp_sndrcvinfo structure defined in Section
4802 * 5.2.2) The input parameters accepted by this call include
4803 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4804 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4805 * to this call if the caller is using the UDP model.
4807 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4809 static int sctp_getsockopt_default_send_param(struct sock *sk,
4810 int len, char __user *optval,
4813 struct sctp_sndrcvinfo info;
4814 struct sctp_association *asoc;
4815 struct sctp_sock *sp = sctp_sk(sk);
4817 if (len < sizeof(struct sctp_sndrcvinfo))
4820 len = sizeof(struct sctp_sndrcvinfo);
4822 if (copy_from_user(&info, optval, len))
4825 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4826 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4830 info.sinfo_stream = asoc->default_stream;
4831 info.sinfo_flags = asoc->default_flags;
4832 info.sinfo_ppid = asoc->default_ppid;
4833 info.sinfo_context = asoc->default_context;
4834 info.sinfo_timetolive = asoc->default_timetolive;
4836 info.sinfo_stream = sp->default_stream;
4837 info.sinfo_flags = sp->default_flags;
4838 info.sinfo_ppid = sp->default_ppid;
4839 info.sinfo_context = sp->default_context;
4840 info.sinfo_timetolive = sp->default_timetolive;
4843 if (put_user(len, optlen))
4845 if (copy_to_user(optval, &info, len))
4853 * 7.1.5 SCTP_NODELAY
4855 * Turn on/off any Nagle-like algorithm. This means that packets are
4856 * generally sent as soon as possible and no unnecessary delays are
4857 * introduced, at the cost of more packets in the network. Expects an
4858 * integer boolean flag.
4861 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4862 char __user *optval, int __user *optlen)
4866 if (len < sizeof(int))
4870 val = (sctp_sk(sk)->nodelay == 1);
4871 if (put_user(len, optlen))
4873 if (copy_to_user(optval, &val, len))
4880 * 7.1.1 SCTP_RTOINFO
4882 * The protocol parameters used to initialize and bound retransmission
4883 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4884 * and modify these parameters.
4885 * All parameters are time values, in milliseconds. A value of 0, when
4886 * modifying the parameters, indicates that the current value should not
4890 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4891 char __user *optval,
4892 int __user *optlen) {
4893 struct sctp_rtoinfo rtoinfo;
4894 struct sctp_association *asoc;
4896 if (len < sizeof (struct sctp_rtoinfo))
4899 len = sizeof(struct sctp_rtoinfo);
4901 if (copy_from_user(&rtoinfo, optval, len))
4904 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4906 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4909 /* Values corresponding to the specific association. */
4911 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4912 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4913 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4915 /* Values corresponding to the endpoint. */
4916 struct sctp_sock *sp = sctp_sk(sk);
4918 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4919 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4920 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4923 if (put_user(len, optlen))
4926 if (copy_to_user(optval, &rtoinfo, len))
4934 * 7.1.2 SCTP_ASSOCINFO
4936 * This option is used to tune the maximum retransmission attempts
4937 * of the association.
4938 * Returns an error if the new association retransmission value is
4939 * greater than the sum of the retransmission value of the peer.
4940 * See [SCTP] for more information.
4943 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4944 char __user *optval,
4948 struct sctp_assocparams assocparams;
4949 struct sctp_association *asoc;
4950 struct list_head *pos;
4953 if (len < sizeof (struct sctp_assocparams))
4956 len = sizeof(struct sctp_assocparams);
4958 if (copy_from_user(&assocparams, optval, len))
4961 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4963 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4966 /* Values correspoinding to the specific association */
4968 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4969 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4970 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4971 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4973 (asoc->cookie_life.tv_usec
4976 list_for_each(pos, &asoc->peer.transport_addr_list) {
4980 assocparams.sasoc_number_peer_destinations = cnt;
4982 /* Values corresponding to the endpoint */
4983 struct sctp_sock *sp = sctp_sk(sk);
4985 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
4986 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
4987 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
4988 assocparams.sasoc_cookie_life =
4989 sp->assocparams.sasoc_cookie_life;
4990 assocparams.sasoc_number_peer_destinations =
4992 sasoc_number_peer_destinations;
4995 if (put_user(len, optlen))
4998 if (copy_to_user(optval, &assocparams, len))
5005 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5007 * This socket option is a boolean flag which turns on or off mapped V4
5008 * addresses. If this option is turned on and the socket is type
5009 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5010 * If this option is turned off, then no mapping will be done of V4
5011 * addresses and a user will receive both PF_INET6 and PF_INET type
5012 * addresses on the socket.
5014 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5015 char __user *optval, int __user *optlen)
5018 struct sctp_sock *sp = sctp_sk(sk);
5020 if (len < sizeof(int))
5025 if (put_user(len, optlen))
5027 if (copy_to_user(optval, &val, len))
5034 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5035 * (chapter and verse is quoted at sctp_setsockopt_context())
5037 static int sctp_getsockopt_context(struct sock *sk, int len,
5038 char __user *optval, int __user *optlen)
5040 struct sctp_assoc_value params;
5041 struct sctp_sock *sp;
5042 struct sctp_association *asoc;
5044 if (len < sizeof(struct sctp_assoc_value))
5047 len = sizeof(struct sctp_assoc_value);
5049 if (copy_from_user(¶ms, optval, len))
5054 if (params.assoc_id != 0) {
5055 asoc = sctp_id2assoc(sk, params.assoc_id);
5058 params.assoc_value = asoc->default_rcv_context;
5060 params.assoc_value = sp->default_rcv_context;
5063 if (put_user(len, optlen))
5065 if (copy_to_user(optval, ¶ms, len))
5072 * 7.1.17 Set the maximum fragrmentation size (SCTP_MAXSEG)
5074 * This socket option specifies the maximum size to put in any outgoing
5075 * SCTP chunk. If a message is larger than this size it will be
5076 * fragmented by SCTP into the specified size. Note that the underlying
5077 * SCTP implementation may fragment into smaller sized chunks when the
5078 * PMTU of the underlying association is smaller than the value set by
5081 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5082 char __user *optval, int __user *optlen)
5086 if (len < sizeof(int))
5091 val = sctp_sk(sk)->user_frag;
5092 if (put_user(len, optlen))
5094 if (copy_to_user(optval, &val, len))
5101 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5102 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5104 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5105 char __user *optval, int __user *optlen)
5109 if (len < sizeof(int))
5114 val = sctp_sk(sk)->frag_interleave;
5115 if (put_user(len, optlen))
5117 if (copy_to_user(optval, &val, len))
5124 * 7.1.25. Set or Get the sctp partial delivery point
5125 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5127 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5128 char __user *optval,
5133 if (len < sizeof(u32))
5138 val = sctp_sk(sk)->pd_point;
5139 if (put_user(len, optlen))
5141 if (copy_to_user(optval, &val, len))
5148 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5149 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5151 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5152 char __user *optval,
5155 struct sctp_assoc_value params;
5156 struct sctp_sock *sp;
5157 struct sctp_association *asoc;
5159 if (len < sizeof(int))
5162 if (len == sizeof(int)) {
5164 "SCTP: Use of int in max_burst socket option deprecated\n");
5166 "SCTP: Use struct sctp_assoc_value instead\n");
5167 params.assoc_id = 0;
5168 } else if (len == sizeof (struct sctp_assoc_value)) {
5169 if (copy_from_user(¶ms, optval, len))
5176 if (params.assoc_id != 0) {
5177 asoc = sctp_id2assoc(sk, params.assoc_id);
5180 params.assoc_value = asoc->max_burst;
5182 params.assoc_value = sp->max_burst;
5184 if (len == sizeof(int)) {
5185 if (copy_to_user(optval, ¶ms.assoc_value, len))
5188 if (copy_to_user(optval, ¶ms, len))
5196 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5197 char __user *optval, int __user *optlen)
5199 struct sctp_hmac_algo_param *hmacs;
5202 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5203 param_len = ntohs(hmacs->param_hdr.length);
5205 if (len < param_len)
5207 if (put_user(len, optlen))
5209 if (copy_to_user(optval, hmacs->hmac_ids, len))
5215 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5216 char __user *optval, int __user *optlen)
5218 struct sctp_authkeyid val;
5219 struct sctp_association *asoc;
5221 if (len < sizeof(struct sctp_authkeyid))
5223 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5226 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5227 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5231 val.scact_keynumber = asoc->active_key_id;
5233 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5238 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5239 char __user *optval, int __user *optlen)
5241 struct sctp_authchunks __user *p = (void __user *)optval;
5242 struct sctp_authchunks val;
5243 struct sctp_association *asoc;
5244 struct sctp_chunks_param *ch;
5248 if (len <= sizeof(struct sctp_authchunks))
5251 if (copy_from_user(&val, p, sizeof(struct sctp_authchunks)))
5254 to = p->gauth_chunks;
5255 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5259 ch = asoc->peer.peer_chunks;
5261 /* See if the user provided enough room for all the data */
5262 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5263 if (len < num_chunks)
5267 if (put_user(len, optlen))
5269 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5271 if (copy_to_user(to, ch->chunks, len))
5277 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5278 char __user *optval, int __user *optlen)
5280 struct sctp_authchunks __user *p = (void __user *)optval;
5281 struct sctp_authchunks val;
5282 struct sctp_association *asoc;
5283 struct sctp_chunks_param *ch;
5287 if (len <= sizeof(struct sctp_authchunks))
5290 if (copy_from_user(&val, p, sizeof(struct sctp_authchunks)))
5293 to = p->gauth_chunks;
5294 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5295 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5299 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5301 ch = sctp_sk(sk)->ep->auth_chunk_list;
5303 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5304 if (len < num_chunks)
5308 if (put_user(len, optlen))
5310 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5312 if (copy_to_user(to, ch->chunks, len))
5318 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5319 char __user *optval, int __user *optlen)
5324 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5327 /* I can hardly begin to describe how wrong this is. This is
5328 * so broken as to be worse than useless. The API draft
5329 * REALLY is NOT helpful here... I am not convinced that the
5330 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5331 * are at all well-founded.
5333 if (level != SOL_SCTP) {
5334 struct sctp_af *af = sctp_sk(sk)->pf->af;
5336 retval = af->getsockopt(sk, level, optname, optval, optlen);
5340 if (get_user(len, optlen))
5347 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5349 case SCTP_DISABLE_FRAGMENTS:
5350 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5354 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5356 case SCTP_AUTOCLOSE:
5357 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5359 case SCTP_SOCKOPT_PEELOFF:
5360 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5362 case SCTP_PEER_ADDR_PARAMS:
5363 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5366 case SCTP_DELAYED_ACK:
5367 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5371 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5373 case SCTP_GET_PEER_ADDRS_NUM_OLD:
5374 retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
5377 case SCTP_GET_LOCAL_ADDRS_NUM_OLD:
5378 retval = sctp_getsockopt_local_addrs_num_old(sk, len, optval,
5381 case SCTP_GET_PEER_ADDRS_OLD:
5382 retval = sctp_getsockopt_peer_addrs_old(sk, len, optval,
5385 case SCTP_GET_LOCAL_ADDRS_OLD:
5386 retval = sctp_getsockopt_local_addrs_old(sk, len, optval,
5389 case SCTP_GET_PEER_ADDRS:
5390 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5393 case SCTP_GET_LOCAL_ADDRS:
5394 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5397 case SCTP_DEFAULT_SEND_PARAM:
5398 retval = sctp_getsockopt_default_send_param(sk, len,
5401 case SCTP_PRIMARY_ADDR:
5402 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5405 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5408 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5410 case SCTP_ASSOCINFO:
5411 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5413 case SCTP_I_WANT_MAPPED_V4_ADDR:
5414 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5417 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5419 case SCTP_GET_PEER_ADDR_INFO:
5420 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5423 case SCTP_ADAPTATION_LAYER:
5424 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5428 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5430 case SCTP_FRAGMENT_INTERLEAVE:
5431 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5434 case SCTP_PARTIAL_DELIVERY_POINT:
5435 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5438 case SCTP_MAX_BURST:
5439 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5442 case SCTP_AUTH_CHUNK:
5443 case SCTP_AUTH_DELETE_KEY:
5444 retval = -EOPNOTSUPP;
5446 case SCTP_HMAC_IDENT:
5447 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5449 case SCTP_AUTH_ACTIVE_KEY:
5450 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5452 case SCTP_PEER_AUTH_CHUNKS:
5453 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5456 case SCTP_LOCAL_AUTH_CHUNKS:
5457 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5461 retval = -ENOPROTOOPT;
5465 sctp_release_sock(sk);
5469 static void sctp_hash(struct sock *sk)
5474 static void sctp_unhash(struct sock *sk)
5479 /* Check if port is acceptable. Possibly find first available port.
5481 * The port hash table (contained in the 'global' SCTP protocol storage
5482 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5483 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5484 * list (the list number is the port number hashed out, so as you
5485 * would expect from a hash function, all the ports in a given list have
5486 * such a number that hashes out to the same list number; you were
5487 * expecting that, right?); so each list has a set of ports, with a
5488 * link to the socket (struct sock) that uses it, the port number and
5489 * a fastreuse flag (FIXME: NPI ipg).
5491 static struct sctp_bind_bucket *sctp_bucket_create(
5492 struct sctp_bind_hashbucket *head, unsigned short snum);
5494 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5496 struct sctp_bind_hashbucket *head; /* hash list */
5497 struct sctp_bind_bucket *pp; /* hash list port iterator */
5498 struct hlist_node *node;
5499 unsigned short snum;
5502 snum = ntohs(addr->v4.sin_port);
5504 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5505 sctp_local_bh_disable();
5508 /* Search for an available port. */
5509 int low, high, remaining, index;
5512 inet_get_local_port_range(&low, &high);
5513 remaining = (high - low) + 1;
5514 rover = net_random() % remaining + low;
5518 if ((rover < low) || (rover > high))
5520 index = sctp_phashfn(rover);
5521 head = &sctp_port_hashtable[index];
5522 sctp_spin_lock(&head->lock);
5523 sctp_for_each_hentry(pp, node, &head->chain)
5524 if (pp->port == rover)
5528 sctp_spin_unlock(&head->lock);
5529 } while (--remaining > 0);
5531 /* Exhausted local port range during search? */
5536 /* OK, here is the one we will use. HEAD (the port
5537 * hash table list entry) is non-NULL and we hold it's
5542 /* We are given an specific port number; we verify
5543 * that it is not being used. If it is used, we will
5544 * exahust the search in the hash list corresponding
5545 * to the port number (snum) - we detect that with the
5546 * port iterator, pp being NULL.
5548 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5549 sctp_spin_lock(&head->lock);
5550 sctp_for_each_hentry(pp, node, &head->chain) {
5551 if (pp->port == snum)
5558 if (!hlist_empty(&pp->owner)) {
5559 /* We had a port hash table hit - there is an
5560 * available port (pp != NULL) and it is being
5561 * used by other socket (pp->owner not empty); that other
5562 * socket is going to be sk2.
5564 int reuse = sk->sk_reuse;
5566 struct hlist_node *node;
5568 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5569 if (pp->fastreuse && sk->sk_reuse &&
5570 sk->sk_state != SCTP_SS_LISTENING)
5573 /* Run through the list of sockets bound to the port
5574 * (pp->port) [via the pointers bind_next and
5575 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5576 * we get the endpoint they describe and run through
5577 * the endpoint's list of IP (v4 or v6) addresses,
5578 * comparing each of the addresses with the address of
5579 * the socket sk. If we find a match, then that means
5580 * that this port/socket (sk) combination are already
5583 sk_for_each_bound(sk2, node, &pp->owner) {
5584 struct sctp_endpoint *ep2;
5585 ep2 = sctp_sk(sk2)->ep;
5587 if (reuse && sk2->sk_reuse &&
5588 sk2->sk_state != SCTP_SS_LISTENING)
5591 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5592 sctp_sk(sk2), sctp_sk(sk))) {
5597 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5600 /* If there was a hash table miss, create a new port. */
5602 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5605 /* In either case (hit or miss), make sure fastreuse is 1 only
5606 * if sk->sk_reuse is too (that is, if the caller requested
5607 * SO_REUSEADDR on this socket -sk-).
5609 if (hlist_empty(&pp->owner)) {
5610 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5614 } else if (pp->fastreuse &&
5615 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5618 /* We are set, so fill up all the data in the hash table
5619 * entry, tie the socket list information with the rest of the
5620 * sockets FIXME: Blurry, NPI (ipg).
5623 if (!sctp_sk(sk)->bind_hash) {
5624 inet_sk(sk)->num = snum;
5625 sk_add_bind_node(sk, &pp->owner);
5626 sctp_sk(sk)->bind_hash = pp;
5631 sctp_spin_unlock(&head->lock);
5634 sctp_local_bh_enable();
5638 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5639 * port is requested.
5641 static int sctp_get_port(struct sock *sk, unsigned short snum)
5644 union sctp_addr addr;
5645 struct sctp_af *af = sctp_sk(sk)->pf->af;
5647 /* Set up a dummy address struct from the sk. */
5648 af->from_sk(&addr, sk);
5649 addr.v4.sin_port = htons(snum);
5651 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5652 ret = sctp_get_port_local(sk, &addr);
5654 return (ret ? 1 : 0);
5658 * 3.1.3 listen() - UDP Style Syntax
5660 * By default, new associations are not accepted for UDP style sockets.
5661 * An application uses listen() to mark a socket as being able to
5662 * accept new associations.
5664 SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
5666 struct sctp_sock *sp = sctp_sk(sk);
5667 struct sctp_endpoint *ep = sp->ep;
5669 /* Only UDP style sockets that are not peeled off are allowed to
5672 if (!sctp_style(sk, UDP))
5675 /* If backlog is zero, disable listening. */
5677 if (sctp_sstate(sk, CLOSED))
5680 sctp_unhash_endpoint(ep);
5681 sk->sk_state = SCTP_SS_CLOSED;
5685 /* Return if we are already listening. */
5686 if (sctp_sstate(sk, LISTENING))
5690 * If a bind() or sctp_bindx() is not called prior to a listen()
5691 * call that allows new associations to be accepted, the system
5692 * picks an ephemeral port and will choose an address set equivalent
5693 * to binding with a wildcard address.
5695 * This is not currently spelled out in the SCTP sockets
5696 * extensions draft, but follows the practice as seen in TCP
5699 * Additionally, turn off fastreuse flag since we are not listening
5701 sk->sk_state = SCTP_SS_LISTENING;
5702 if (!ep->base.bind_addr.port) {
5703 if (sctp_autobind(sk))
5706 sctp_sk(sk)->bind_hash->fastreuse = 0;
5708 sctp_hash_endpoint(ep);
5713 * 4.1.3 listen() - TCP Style Syntax
5715 * Applications uses listen() to ready the SCTP endpoint for accepting
5716 * inbound associations.
5718 SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
5720 struct sctp_sock *sp = sctp_sk(sk);
5721 struct sctp_endpoint *ep = sp->ep;
5723 /* If backlog is zero, disable listening. */
5725 if (sctp_sstate(sk, CLOSED))
5728 sctp_unhash_endpoint(ep);
5729 sk->sk_state = SCTP_SS_CLOSED;
5733 if (sctp_sstate(sk, LISTENING))
5737 * If a bind() or sctp_bindx() is not called prior to a listen()
5738 * call that allows new associations to be accepted, the system
5739 * picks an ephemeral port and will choose an address set equivalent
5740 * to binding with a wildcard address.
5742 * This is not currently spelled out in the SCTP sockets
5743 * extensions draft, but follows the practice as seen in TCP
5746 sk->sk_state = SCTP_SS_LISTENING;
5747 if (!ep->base.bind_addr.port) {
5748 if (sctp_autobind(sk))
5751 sctp_sk(sk)->bind_hash->fastreuse = 0;
5753 sk->sk_max_ack_backlog = backlog;
5754 sctp_hash_endpoint(ep);
5759 * Move a socket to LISTENING state.
5761 int sctp_inet_listen(struct socket *sock, int backlog)
5763 struct sock *sk = sock->sk;
5764 struct crypto_hash *tfm = NULL;
5767 if (unlikely(backlog < 0))
5772 if (sock->state != SS_UNCONNECTED)
5775 /* Allocate HMAC for generating cookie. */
5776 if (sctp_hmac_alg) {
5777 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5779 if (net_ratelimit()) {
5781 "SCTP: failed to load transform for %s: %ld\n",
5782 sctp_hmac_alg, PTR_ERR(tfm));
5789 switch (sock->type) {
5790 case SOCK_SEQPACKET:
5791 err = sctp_seqpacket_listen(sk, backlog);
5794 err = sctp_stream_listen(sk, backlog);
5803 /* Store away the transform reference. */
5804 sctp_sk(sk)->hmac = tfm;
5806 sctp_release_sock(sk);
5809 crypto_free_hash(tfm);
5814 * This function is done by modeling the current datagram_poll() and the
5815 * tcp_poll(). Note that, based on these implementations, we don't
5816 * lock the socket in this function, even though it seems that,
5817 * ideally, locking or some other mechanisms can be used to ensure
5818 * the integrity of the counters (sndbuf and wmem_alloc) used
5819 * in this place. We assume that we don't need locks either until proven
5822 * Another thing to note is that we include the Async I/O support
5823 * here, again, by modeling the current TCP/UDP code. We don't have
5824 * a good way to test with it yet.
5826 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5828 struct sock *sk = sock->sk;
5829 struct sctp_sock *sp = sctp_sk(sk);
5832 poll_wait(file, sk->sk_sleep, wait);
5834 /* A TCP-style listening socket becomes readable when the accept queue
5837 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5838 return (!list_empty(&sp->ep->asocs)) ?
5839 (POLLIN | POLLRDNORM) : 0;
5843 /* Is there any exceptional events? */
5844 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5846 if (sk->sk_shutdown & RCV_SHUTDOWN)
5848 if (sk->sk_shutdown == SHUTDOWN_MASK)
5851 /* Is it readable? Reconsider this code with TCP-style support. */
5852 if (!skb_queue_empty(&sk->sk_receive_queue) ||
5853 (sk->sk_shutdown & RCV_SHUTDOWN))
5854 mask |= POLLIN | POLLRDNORM;
5856 /* The association is either gone or not ready. */
5857 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5860 /* Is it writable? */
5861 if (sctp_writeable(sk)) {
5862 mask |= POLLOUT | POLLWRNORM;
5864 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5866 * Since the socket is not locked, the buffer
5867 * might be made available after the writeable check and
5868 * before the bit is set. This could cause a lost I/O
5869 * signal. tcp_poll() has a race breaker for this race
5870 * condition. Based on their implementation, we put
5871 * in the following code to cover it as well.
5873 if (sctp_writeable(sk))
5874 mask |= POLLOUT | POLLWRNORM;
5879 /********************************************************************
5880 * 2nd Level Abstractions
5881 ********************************************************************/
5883 static struct sctp_bind_bucket *sctp_bucket_create(
5884 struct sctp_bind_hashbucket *head, unsigned short snum)
5886 struct sctp_bind_bucket *pp;
5888 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
5890 SCTP_DBG_OBJCNT_INC(bind_bucket);
5893 INIT_HLIST_HEAD(&pp->owner);
5894 hlist_add_head(&pp->node, &head->chain);
5899 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5900 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5902 if (pp && hlist_empty(&pp->owner)) {
5903 __hlist_del(&pp->node);
5904 kmem_cache_free(sctp_bucket_cachep, pp);
5905 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5909 /* Release this socket's reference to a local port. */
5910 static inline void __sctp_put_port(struct sock *sk)
5912 struct sctp_bind_hashbucket *head =
5913 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->num)];
5914 struct sctp_bind_bucket *pp;
5916 sctp_spin_lock(&head->lock);
5917 pp = sctp_sk(sk)->bind_hash;
5918 __sk_del_bind_node(sk);
5919 sctp_sk(sk)->bind_hash = NULL;
5920 inet_sk(sk)->num = 0;
5921 sctp_bucket_destroy(pp);
5922 sctp_spin_unlock(&head->lock);
5925 void sctp_put_port(struct sock *sk)
5927 sctp_local_bh_disable();
5928 __sctp_put_port(sk);
5929 sctp_local_bh_enable();
5933 * The system picks an ephemeral port and choose an address set equivalent
5934 * to binding with a wildcard address.
5935 * One of those addresses will be the primary address for the association.
5936 * This automatically enables the multihoming capability of SCTP.
5938 static int sctp_autobind(struct sock *sk)
5940 union sctp_addr autoaddr;
5944 /* Initialize a local sockaddr structure to INADDR_ANY. */
5945 af = sctp_sk(sk)->pf->af;
5947 port = htons(inet_sk(sk)->num);
5948 af->inaddr_any(&autoaddr, port);
5950 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
5953 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5956 * 4.2 The cmsghdr Structure *
5958 * When ancillary data is sent or received, any number of ancillary data
5959 * objects can be specified by the msg_control and msg_controllen members of
5960 * the msghdr structure, because each object is preceded by
5961 * a cmsghdr structure defining the object's length (the cmsg_len member).
5962 * Historically Berkeley-derived implementations have passed only one object
5963 * at a time, but this API allows multiple objects to be
5964 * passed in a single call to sendmsg() or recvmsg(). The following example
5965 * shows two ancillary data objects in a control buffer.
5967 * |<--------------------------- msg_controllen -------------------------->|
5970 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5972 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5975 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5977 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5980 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5981 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5983 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5985 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5992 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
5993 sctp_cmsgs_t *cmsgs)
5995 struct cmsghdr *cmsg;
5996 struct msghdr *my_msg = (struct msghdr *)msg;
5998 for (cmsg = CMSG_FIRSTHDR(msg);
6000 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6001 if (!CMSG_OK(my_msg, cmsg))
6004 /* Should we parse this header or ignore? */
6005 if (cmsg->cmsg_level != IPPROTO_SCTP)
6008 /* Strictly check lengths following example in SCM code. */
6009 switch (cmsg->cmsg_type) {
6011 /* SCTP Socket API Extension
6012 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6014 * This cmsghdr structure provides information for
6015 * initializing new SCTP associations with sendmsg().
6016 * The SCTP_INITMSG socket option uses this same data
6017 * structure. This structure is not used for
6020 * cmsg_level cmsg_type cmsg_data[]
6021 * ------------ ------------ ----------------------
6022 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6024 if (cmsg->cmsg_len !=
6025 CMSG_LEN(sizeof(struct sctp_initmsg)))
6027 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6031 /* SCTP Socket API Extension
6032 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6034 * This cmsghdr structure specifies SCTP options for
6035 * sendmsg() and describes SCTP header information
6036 * about a received message through recvmsg().
6038 * cmsg_level cmsg_type cmsg_data[]
6039 * ------------ ------------ ----------------------
6040 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6042 if (cmsg->cmsg_len !=
6043 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6047 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6049 /* Minimally, validate the sinfo_flags. */
6050 if (cmsgs->info->sinfo_flags &
6051 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6052 SCTP_ABORT | SCTP_EOF))
6064 * Wait for a packet..
6065 * Note: This function is the same function as in core/datagram.c
6066 * with a few modifications to make lksctp work.
6068 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6073 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6075 /* Socket errors? */
6076 error = sock_error(sk);
6080 if (!skb_queue_empty(&sk->sk_receive_queue))
6083 /* Socket shut down? */
6084 if (sk->sk_shutdown & RCV_SHUTDOWN)
6087 /* Sequenced packets can come disconnected. If so we report the
6092 /* Is there a good reason to think that we may receive some data? */
6093 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6096 /* Handle signals. */
6097 if (signal_pending(current))
6100 /* Let another process have a go. Since we are going to sleep
6101 * anyway. Note: This may cause odd behaviors if the message
6102 * does not fit in the user's buffer, but this seems to be the
6103 * only way to honor MSG_DONTWAIT realistically.
6105 sctp_release_sock(sk);
6106 *timeo_p = schedule_timeout(*timeo_p);
6110 finish_wait(sk->sk_sleep, &wait);
6114 error = sock_intr_errno(*timeo_p);
6117 finish_wait(sk->sk_sleep, &wait);
6122 /* Receive a datagram.
6123 * Note: This is pretty much the same routine as in core/datagram.c
6124 * with a few changes to make lksctp work.
6126 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6127 int noblock, int *err)
6130 struct sk_buff *skb;
6133 timeo = sock_rcvtimeo(sk, noblock);
6135 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6136 timeo, MAX_SCHEDULE_TIMEOUT);
6139 /* Again only user level code calls this function,
6140 * so nothing interrupt level
6141 * will suddenly eat the receive_queue.
6143 * Look at current nfs client by the way...
6144 * However, this function was corrent in any case. 8)
6146 if (flags & MSG_PEEK) {
6147 spin_lock_bh(&sk->sk_receive_queue.lock);
6148 skb = skb_peek(&sk->sk_receive_queue);
6150 atomic_inc(&skb->users);
6151 spin_unlock_bh(&sk->sk_receive_queue.lock);
6153 skb = skb_dequeue(&sk->sk_receive_queue);
6159 /* Caller is allowed not to check sk->sk_err before calling. */
6160 error = sock_error(sk);
6164 if (sk->sk_shutdown & RCV_SHUTDOWN)
6167 /* User doesn't want to wait. */
6171 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6180 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6181 static void __sctp_write_space(struct sctp_association *asoc)
6183 struct sock *sk = asoc->base.sk;
6184 struct socket *sock = sk->sk_socket;
6186 if ((sctp_wspace(asoc) > 0) && sock) {
6187 if (waitqueue_active(&asoc->wait))
6188 wake_up_interruptible(&asoc->wait);
6190 if (sctp_writeable(sk)) {
6191 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6192 wake_up_interruptible(sk->sk_sleep);
6194 /* Note that we try to include the Async I/O support
6195 * here by modeling from the current TCP/UDP code.
6196 * We have not tested with it yet.
6198 if (sock->fasync_list &&
6199 !(sk->sk_shutdown & SEND_SHUTDOWN))
6200 sock_wake_async(sock,
6201 SOCK_WAKE_SPACE, POLL_OUT);
6206 /* Do accounting for the sndbuf space.
6207 * Decrement the used sndbuf space of the corresponding association by the
6208 * data size which was just transmitted(freed).
6210 static void sctp_wfree(struct sk_buff *skb)
6212 struct sctp_association *asoc;
6213 struct sctp_chunk *chunk;
6216 /* Get the saved chunk pointer. */
6217 chunk = *((struct sctp_chunk **)(skb->cb));
6220 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6221 sizeof(struct sk_buff) +
6222 sizeof(struct sctp_chunk);
6224 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6227 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6229 sk->sk_wmem_queued -= skb->truesize;
6230 sk_mem_uncharge(sk, skb->truesize);
6233 __sctp_write_space(asoc);
6235 sctp_association_put(asoc);
6238 /* Do accounting for the receive space on the socket.
6239 * Accounting for the association is done in ulpevent.c
6240 * We set this as a destructor for the cloned data skbs so that
6241 * accounting is done at the correct time.
6243 void sctp_sock_rfree(struct sk_buff *skb)
6245 struct sock *sk = skb->sk;
6246 struct sctp_ulpevent *event = sctp_skb2event(skb);
6248 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6251 * Mimic the behavior of sock_rfree
6253 sk_mem_uncharge(sk, event->rmem_len);
6257 /* Helper function to wait for space in the sndbuf. */
6258 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6261 struct sock *sk = asoc->base.sk;
6263 long current_timeo = *timeo_p;
6266 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6267 asoc, (long)(*timeo_p), msg_len);
6269 /* Increment the association's refcnt. */
6270 sctp_association_hold(asoc);
6272 /* Wait on the association specific sndbuf space. */
6274 prepare_to_wait_exclusive(&asoc->wait, &wait,
6275 TASK_INTERRUPTIBLE);
6278 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6281 if (signal_pending(current))
6282 goto do_interrupted;
6283 if (msg_len <= sctp_wspace(asoc))
6286 /* Let another process have a go. Since we are going
6289 sctp_release_sock(sk);
6290 current_timeo = schedule_timeout(current_timeo);
6291 BUG_ON(sk != asoc->base.sk);
6294 *timeo_p = current_timeo;
6298 finish_wait(&asoc->wait, &wait);
6300 /* Release the association's refcnt. */
6301 sctp_association_put(asoc);
6310 err = sock_intr_errno(*timeo_p);
6318 /* If socket sndbuf has changed, wake up all per association waiters. */
6319 void sctp_write_space(struct sock *sk)
6321 struct sctp_association *asoc;
6323 /* Wake up the tasks in each wait queue. */
6324 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6325 __sctp_write_space(asoc);
6329 /* Is there any sndbuf space available on the socket?
6331 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6332 * associations on the same socket. For a UDP-style socket with
6333 * multiple associations, it is possible for it to be "unwriteable"
6334 * prematurely. I assume that this is acceptable because
6335 * a premature "unwriteable" is better than an accidental "writeable" which
6336 * would cause an unwanted block under certain circumstances. For the 1-1
6337 * UDP-style sockets or TCP-style sockets, this code should work.
6340 static int sctp_writeable(struct sock *sk)
6344 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
6350 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6351 * returns immediately with EINPROGRESS.
6353 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6355 struct sock *sk = asoc->base.sk;
6357 long current_timeo = *timeo_p;
6360 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6363 /* Increment the association's refcnt. */
6364 sctp_association_hold(asoc);
6367 prepare_to_wait_exclusive(&asoc->wait, &wait,
6368 TASK_INTERRUPTIBLE);
6371 if (sk->sk_shutdown & RCV_SHUTDOWN)
6373 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6376 if (signal_pending(current))
6377 goto do_interrupted;
6379 if (sctp_state(asoc, ESTABLISHED))
6382 /* Let another process have a go. Since we are going
6385 sctp_release_sock(sk);
6386 current_timeo = schedule_timeout(current_timeo);
6389 *timeo_p = current_timeo;
6393 finish_wait(&asoc->wait, &wait);
6395 /* Release the association's refcnt. */
6396 sctp_association_put(asoc);
6401 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6404 err = -ECONNREFUSED;
6408 err = sock_intr_errno(*timeo_p);
6416 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6418 struct sctp_endpoint *ep;
6422 ep = sctp_sk(sk)->ep;
6426 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
6427 TASK_INTERRUPTIBLE);
6429 if (list_empty(&ep->asocs)) {
6430 sctp_release_sock(sk);
6431 timeo = schedule_timeout(timeo);
6436 if (!sctp_sstate(sk, LISTENING))
6440 if (!list_empty(&ep->asocs))
6443 err = sock_intr_errno(timeo);
6444 if (signal_pending(current))
6452 finish_wait(sk->sk_sleep, &wait);
6457 static void sctp_wait_for_close(struct sock *sk, long timeout)
6462 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6463 if (list_empty(&sctp_sk(sk)->ep->asocs))
6465 sctp_release_sock(sk);
6466 timeout = schedule_timeout(timeout);
6468 } while (!signal_pending(current) && timeout);
6470 finish_wait(sk->sk_sleep, &wait);
6473 static void sctp_sock_rfree_frag(struct sk_buff *skb)
6475 struct sk_buff *frag;
6480 /* Don't forget the fragments. */
6481 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6482 sctp_sock_rfree_frag(frag);
6485 sctp_sock_rfree(skb);
6488 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6490 struct sk_buff *frag;
6495 /* Don't forget the fragments. */
6496 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6497 sctp_skb_set_owner_r_frag(frag, sk);
6500 sctp_skb_set_owner_r(skb, sk);
6503 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6504 * and its messages to the newsk.
6506 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6507 struct sctp_association *assoc,
6508 sctp_socket_type_t type)
6510 struct sctp_sock *oldsp = sctp_sk(oldsk);
6511 struct sctp_sock *newsp = sctp_sk(newsk);
6512 struct sctp_bind_bucket *pp; /* hash list port iterator */
6513 struct sctp_endpoint *newep = newsp->ep;
6514 struct sk_buff *skb, *tmp;
6515 struct sctp_ulpevent *event;
6516 struct sctp_bind_hashbucket *head;
6518 /* Migrate socket buffer sizes and all the socket level options to the
6521 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6522 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6523 /* Brute force copy old sctp opt. */
6524 inet_sk_copy_descendant(newsk, oldsk);
6526 /* Restore the ep value that was overwritten with the above structure
6532 /* Hook this new socket in to the bind_hash list. */
6533 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->num)];
6534 sctp_local_bh_disable();
6535 sctp_spin_lock(&head->lock);
6536 pp = sctp_sk(oldsk)->bind_hash;
6537 sk_add_bind_node(newsk, &pp->owner);
6538 sctp_sk(newsk)->bind_hash = pp;
6539 inet_sk(newsk)->num = inet_sk(oldsk)->num;
6540 sctp_spin_unlock(&head->lock);
6541 sctp_local_bh_enable();
6543 /* Copy the bind_addr list from the original endpoint to the new
6544 * endpoint so that we can handle restarts properly
6546 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6547 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6549 /* Move any messages in the old socket's receive queue that are for the
6550 * peeled off association to the new socket's receive queue.
6552 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6553 event = sctp_skb2event(skb);
6554 if (event->asoc == assoc) {
6555 sctp_sock_rfree_frag(skb);
6556 __skb_unlink(skb, &oldsk->sk_receive_queue);
6557 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6558 sctp_skb_set_owner_r_frag(skb, newsk);
6562 /* Clean up any messages pending delivery due to partial
6563 * delivery. Three cases:
6564 * 1) No partial deliver; no work.
6565 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6566 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6568 skb_queue_head_init(&newsp->pd_lobby);
6569 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6571 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6572 struct sk_buff_head *queue;
6574 /* Decide which queue to move pd_lobby skbs to. */
6575 if (assoc->ulpq.pd_mode) {
6576 queue = &newsp->pd_lobby;
6578 queue = &newsk->sk_receive_queue;
6580 /* Walk through the pd_lobby, looking for skbs that
6581 * need moved to the new socket.
6583 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6584 event = sctp_skb2event(skb);
6585 if (event->asoc == assoc) {
6586 sctp_sock_rfree_frag(skb);
6587 __skb_unlink(skb, &oldsp->pd_lobby);
6588 __skb_queue_tail(queue, skb);
6589 sctp_skb_set_owner_r_frag(skb, newsk);
6593 /* Clear up any skbs waiting for the partial
6594 * delivery to finish.
6596 if (assoc->ulpq.pd_mode)
6597 sctp_clear_pd(oldsk, NULL);
6601 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp) {
6602 sctp_sock_rfree_frag(skb);
6603 sctp_skb_set_owner_r_frag(skb, newsk);
6606 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp) {
6607 sctp_sock_rfree_frag(skb);
6608 sctp_skb_set_owner_r_frag(skb, newsk);
6611 /* Set the type of socket to indicate that it is peeled off from the
6612 * original UDP-style socket or created with the accept() call on a
6613 * TCP-style socket..
6617 /* Mark the new socket "in-use" by the user so that any packets
6618 * that may arrive on the association after we've moved it are
6619 * queued to the backlog. This prevents a potential race between
6620 * backlog processing on the old socket and new-packet processing
6621 * on the new socket.
6623 * The caller has just allocated newsk so we can guarantee that other
6624 * paths won't try to lock it and then oldsk.
6626 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6627 sctp_assoc_migrate(assoc, newsk);
6629 /* If the association on the newsk is already closed before accept()
6630 * is called, set RCV_SHUTDOWN flag.
6632 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6633 newsk->sk_shutdown |= RCV_SHUTDOWN;
6635 newsk->sk_state = SCTP_SS_ESTABLISHED;
6636 sctp_release_sock(newsk);
6640 /* This proto struct describes the ULP interface for SCTP. */
6641 struct proto sctp_prot = {
6643 .owner = THIS_MODULE,
6644 .close = sctp_close,
6645 .connect = sctp_connect,
6646 .disconnect = sctp_disconnect,
6647 .accept = sctp_accept,
6648 .ioctl = sctp_ioctl,
6649 .init = sctp_init_sock,
6650 .destroy = sctp_destroy_sock,
6651 .shutdown = sctp_shutdown,
6652 .setsockopt = sctp_setsockopt,
6653 .getsockopt = sctp_getsockopt,
6654 .sendmsg = sctp_sendmsg,
6655 .recvmsg = sctp_recvmsg,
6657 .backlog_rcv = sctp_backlog_rcv,
6659 .unhash = sctp_unhash,
6660 .get_port = sctp_get_port,
6661 .obj_size = sizeof(struct sctp_sock),
6662 .sysctl_mem = sysctl_sctp_mem,
6663 .sysctl_rmem = sysctl_sctp_rmem,
6664 .sysctl_wmem = sysctl_sctp_wmem,
6665 .memory_pressure = &sctp_memory_pressure,
6666 .enter_memory_pressure = sctp_enter_memory_pressure,
6667 .memory_allocated = &sctp_memory_allocated,
6668 .sockets_allocated = &sctp_sockets_allocated,
6671 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6673 struct proto sctpv6_prot = {
6675 .owner = THIS_MODULE,
6676 .close = sctp_close,
6677 .connect = sctp_connect,
6678 .disconnect = sctp_disconnect,
6679 .accept = sctp_accept,
6680 .ioctl = sctp_ioctl,
6681 .init = sctp_init_sock,
6682 .destroy = sctp_destroy_sock,
6683 .shutdown = sctp_shutdown,
6684 .setsockopt = sctp_setsockopt,
6685 .getsockopt = sctp_getsockopt,
6686 .sendmsg = sctp_sendmsg,
6687 .recvmsg = sctp_recvmsg,
6689 .backlog_rcv = sctp_backlog_rcv,
6691 .unhash = sctp_unhash,
6692 .get_port = sctp_get_port,
6693 .obj_size = sizeof(struct sctp6_sock),
6694 .sysctl_mem = sysctl_sctp_mem,
6695 .sysctl_rmem = sysctl_sctp_rmem,
6696 .sysctl_wmem = sysctl_sctp_wmem,
6697 .memory_pressure = &sctp_memory_pressure,
6698 .enter_memory_pressure = sctp_enter_memory_pressure,
6699 .memory_allocated = &sctp_memory_allocated,
6700 .sockets_allocated = &sctp_sockets_allocated,
6702 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */