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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
62 #include <linux/types.h>
63 #include <linux/kernel.h>
64 #include <linux/wait.h>
65 #include <linux/time.h>
67 #include <linux/capability.h>
68 #include <linux/fcntl.h>
69 #include <linux/poll.h>
70 #include <linux/init.h>
71 #include <linux/crypto.h>
72 #include <linux/slab.h>
76 #include <net/route.h>
78 #include <net/inet_common.h>
80 #include <linux/socket.h> /* for sa_family_t */
82 #include <net/sctp/sctp.h>
83 #include <net/sctp/sm.h>
85 /* WARNING: Please do not remove the SCTP_STATIC attribute to
86 * any of the functions below as they are used to export functions
87 * used by a project regression testsuite.
90 /* Forward declarations for internal helper functions. */
91 static int sctp_writeable(struct sock *sk);
92 static void sctp_wfree(struct sk_buff *skb);
93 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
95 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
96 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
97 static int sctp_wait_for_accept(struct sock *sk, long timeo);
98 static void sctp_wait_for_close(struct sock *sk, long timeo);
99 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
100 union sctp_addr *addr, int len);
101 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
102 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
103 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
104 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
105 static int sctp_send_asconf(struct sctp_association *asoc,
106 struct sctp_chunk *chunk);
107 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
108 static int sctp_autobind(struct sock *sk);
109 static void sctp_sock_migrate(struct sock *, struct sock *,
110 struct sctp_association *, sctp_socket_type_t);
111 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
113 extern struct kmem_cache *sctp_bucket_cachep;
114 extern long sysctl_sctp_mem[3];
115 extern int sysctl_sctp_rmem[3];
116 extern int sysctl_sctp_wmem[3];
118 static int sctp_memory_pressure;
119 static atomic_long_t sctp_memory_allocated;
120 struct percpu_counter sctp_sockets_allocated;
122 static void sctp_enter_memory_pressure(struct sock *sk)
124 sctp_memory_pressure = 1;
128 /* Get the sndbuf space available at the time on the association. */
129 static inline int sctp_wspace(struct sctp_association *asoc)
133 if (asoc->ep->sndbuf_policy)
134 amt = asoc->sndbuf_used;
136 amt = sk_wmem_alloc_get(asoc->base.sk);
138 if (amt >= asoc->base.sk->sk_sndbuf) {
139 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
142 amt = sk_stream_wspace(asoc->base.sk);
147 amt = asoc->base.sk->sk_sndbuf - amt;
152 /* Increment the used sndbuf space count of the corresponding association by
153 * the size of the outgoing data chunk.
154 * Also, set the skb destructor for sndbuf accounting later.
156 * Since it is always 1-1 between chunk and skb, and also a new skb is always
157 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
158 * destructor in the data chunk skb for the purpose of the sndbuf space
161 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
163 struct sctp_association *asoc = chunk->asoc;
164 struct sock *sk = asoc->base.sk;
166 /* The sndbuf space is tracked per association. */
167 sctp_association_hold(asoc);
169 skb_set_owner_w(chunk->skb, sk);
171 chunk->skb->destructor = sctp_wfree;
172 /* Save the chunk pointer in skb for sctp_wfree to use later. */
173 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
175 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
176 sizeof(struct sk_buff) +
177 sizeof(struct sctp_chunk);
179 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
180 sk->sk_wmem_queued += chunk->skb->truesize;
181 sk_mem_charge(sk, chunk->skb->truesize);
184 /* Verify that this is a valid address. */
185 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
190 /* Verify basic sockaddr. */
191 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
195 /* Is this a valid SCTP address? */
196 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
199 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
205 /* Look up the association by its id. If this is not a UDP-style
206 * socket, the ID field is always ignored.
208 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
210 struct sctp_association *asoc = NULL;
212 /* If this is not a UDP-style socket, assoc id should be ignored. */
213 if (!sctp_style(sk, UDP)) {
214 /* Return NULL if the socket state is not ESTABLISHED. It
215 * could be a TCP-style listening socket or a socket which
216 * hasn't yet called connect() to establish an association.
218 if (!sctp_sstate(sk, ESTABLISHED))
221 /* Get the first and the only association from the list. */
222 if (!list_empty(&sctp_sk(sk)->ep->asocs))
223 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
224 struct sctp_association, asocs);
228 /* Otherwise this is a UDP-style socket. */
229 if (!id || (id == (sctp_assoc_t)-1))
232 spin_lock_bh(&sctp_assocs_id_lock);
233 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
234 spin_unlock_bh(&sctp_assocs_id_lock);
236 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
242 /* Look up the transport from an address and an assoc id. If both address and
243 * id are specified, the associations matching the address and the id should be
246 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
247 struct sockaddr_storage *addr,
250 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
251 struct sctp_transport *transport;
252 union sctp_addr *laddr = (union sctp_addr *)addr;
254 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
261 id_asoc = sctp_id2assoc(sk, id);
262 if (id_asoc && (id_asoc != addr_asoc))
265 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
266 (union sctp_addr *)addr);
271 /* API 3.1.2 bind() - UDP Style Syntax
272 * The syntax of bind() is,
274 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
276 * sd - the socket descriptor returned by socket().
277 * addr - the address structure (struct sockaddr_in or struct
278 * sockaddr_in6 [RFC 2553]),
279 * addr_len - the size of the address structure.
281 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
287 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
290 /* Disallow binding twice. */
291 if (!sctp_sk(sk)->ep->base.bind_addr.port)
292 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
297 sctp_release_sock(sk);
302 static long sctp_get_port_local(struct sock *, union sctp_addr *);
304 /* Verify this is a valid sockaddr. */
305 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
306 union sctp_addr *addr, int len)
310 /* Check minimum size. */
311 if (len < sizeof (struct sockaddr))
314 /* V4 mapped address are really of AF_INET family */
315 if (addr->sa.sa_family == AF_INET6 &&
316 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
317 if (!opt->pf->af_supported(AF_INET, opt))
320 /* Does this PF support this AF? */
321 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
325 /* If we get this far, af is valid. */
326 af = sctp_get_af_specific(addr->sa.sa_family);
328 if (len < af->sockaddr_len)
334 /* Bind a local address either to an endpoint or to an association. */
335 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
337 struct sctp_sock *sp = sctp_sk(sk);
338 struct sctp_endpoint *ep = sp->ep;
339 struct sctp_bind_addr *bp = &ep->base.bind_addr;
344 /* Common sockaddr verification. */
345 af = sctp_sockaddr_af(sp, addr, len);
347 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
352 snum = ntohs(addr->v4.sin_port);
354 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
355 ", port: %d, new port: %d, len: %d)\n",
361 /* PF specific bind() address verification. */
362 if (!sp->pf->bind_verify(sp, addr))
363 return -EADDRNOTAVAIL;
365 /* We must either be unbound, or bind to the same port.
366 * It's OK to allow 0 ports if we are already bound.
367 * We'll just inhert an already bound port in this case
372 else if (snum != bp->port) {
373 SCTP_DEBUG_PRINTK("sctp_do_bind:"
374 " New port %d does not match existing port "
375 "%d.\n", snum, bp->port);
380 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
383 /* See if the address matches any of the addresses we may have
384 * already bound before checking against other endpoints.
386 if (sctp_bind_addr_match(bp, addr, sp))
389 /* Make sure we are allowed to bind here.
390 * The function sctp_get_port_local() does duplicate address
393 addr->v4.sin_port = htons(snum);
394 if ((ret = sctp_get_port_local(sk, addr))) {
398 /* Refresh ephemeral port. */
400 bp->port = inet_sk(sk)->inet_num;
402 /* Add the address to the bind address list.
403 * Use GFP_ATOMIC since BHs will be disabled.
405 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
407 /* Copy back into socket for getsockname() use. */
409 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
410 af->to_sk_saddr(addr, sk);
416 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
418 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
419 * at any one time. If a sender, after sending an ASCONF chunk, decides
420 * it needs to transfer another ASCONF Chunk, it MUST wait until the
421 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
422 * subsequent ASCONF. Note this restriction binds each side, so at any
423 * time two ASCONF may be in-transit on any given association (one sent
424 * from each endpoint).
426 static int sctp_send_asconf(struct sctp_association *asoc,
427 struct sctp_chunk *chunk)
431 /* If there is an outstanding ASCONF chunk, queue it for later
434 if (asoc->addip_last_asconf) {
435 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
439 /* Hold the chunk until an ASCONF_ACK is received. */
440 sctp_chunk_hold(chunk);
441 retval = sctp_primitive_ASCONF(asoc, chunk);
443 sctp_chunk_free(chunk);
445 asoc->addip_last_asconf = chunk;
451 /* Add a list of addresses as bind addresses to local endpoint or
454 * Basically run through each address specified in the addrs/addrcnt
455 * array/length pair, determine if it is IPv6 or IPv4 and call
456 * sctp_do_bind() on it.
458 * If any of them fails, then the operation will be reversed and the
459 * ones that were added will be removed.
461 * Only sctp_setsockopt_bindx() is supposed to call this function.
463 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
468 struct sockaddr *sa_addr;
471 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
475 for (cnt = 0; cnt < addrcnt; cnt++) {
476 /* The list may contain either IPv4 or IPv6 address;
477 * determine the address length for walking thru the list.
479 sa_addr = (struct sockaddr *)addr_buf;
480 af = sctp_get_af_specific(sa_addr->sa_family);
486 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
489 addr_buf += af->sockaddr_len;
493 /* Failed. Cleanup the ones that have been added */
495 sctp_bindx_rem(sk, addrs, cnt);
503 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
504 * associations that are part of the endpoint indicating that a list of local
505 * addresses are added to the endpoint.
507 * If any of the addresses is already in the bind address list of the
508 * association, we do not send the chunk for that association. But it will not
509 * affect other associations.
511 * Only sctp_setsockopt_bindx() is supposed to call this function.
513 static int sctp_send_asconf_add_ip(struct sock *sk,
514 struct sockaddr *addrs,
517 struct sctp_sock *sp;
518 struct sctp_endpoint *ep;
519 struct sctp_association *asoc;
520 struct sctp_bind_addr *bp;
521 struct sctp_chunk *chunk;
522 struct sctp_sockaddr_entry *laddr;
523 union sctp_addr *addr;
524 union sctp_addr saveaddr;
531 if (!sctp_addip_enable)
537 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
538 __func__, sk, addrs, addrcnt);
540 list_for_each_entry(asoc, &ep->asocs, asocs) {
542 if (!asoc->peer.asconf_capable)
545 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
548 if (!sctp_state(asoc, ESTABLISHED))
551 /* Check if any address in the packed array of addresses is
552 * in the bind address list of the association. If so,
553 * do not send the asconf chunk to its peer, but continue with
554 * other associations.
557 for (i = 0; i < addrcnt; i++) {
558 addr = (union sctp_addr *)addr_buf;
559 af = sctp_get_af_specific(addr->v4.sin_family);
565 if (sctp_assoc_lookup_laddr(asoc, addr))
568 addr_buf += af->sockaddr_len;
573 /* Use the first valid address in bind addr list of
574 * association as Address Parameter of ASCONF CHUNK.
576 bp = &asoc->base.bind_addr;
577 p = bp->address_list.next;
578 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
579 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
580 addrcnt, SCTP_PARAM_ADD_IP);
586 retval = sctp_send_asconf(asoc, chunk);
590 /* Add the new addresses to the bind address list with
591 * use_as_src set to 0.
594 for (i = 0; i < addrcnt; i++) {
595 addr = (union sctp_addr *)addr_buf;
596 af = sctp_get_af_specific(addr->v4.sin_family);
597 memcpy(&saveaddr, addr, af->sockaddr_len);
598 retval = sctp_add_bind_addr(bp, &saveaddr,
599 SCTP_ADDR_NEW, GFP_ATOMIC);
600 addr_buf += af->sockaddr_len;
608 /* Remove a list of addresses from bind addresses list. Do not remove the
611 * Basically run through each address specified in the addrs/addrcnt
612 * array/length pair, determine if it is IPv6 or IPv4 and call
613 * sctp_del_bind() on it.
615 * If any of them fails, then the operation will be reversed and the
616 * ones that were removed will be added back.
618 * At least one address has to be left; if only one address is
619 * available, the operation will return -EBUSY.
621 * Only sctp_setsockopt_bindx() is supposed to call this function.
623 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
625 struct sctp_sock *sp = sctp_sk(sk);
626 struct sctp_endpoint *ep = sp->ep;
628 struct sctp_bind_addr *bp = &ep->base.bind_addr;
631 union sctp_addr *sa_addr;
634 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
638 for (cnt = 0; cnt < addrcnt; cnt++) {
639 /* If the bind address list is empty or if there is only one
640 * bind address, there is nothing more to be removed (we need
641 * at least one address here).
643 if (list_empty(&bp->address_list) ||
644 (sctp_list_single_entry(&bp->address_list))) {
649 sa_addr = (union sctp_addr *)addr_buf;
650 af = sctp_get_af_specific(sa_addr->sa.sa_family);
656 if (!af->addr_valid(sa_addr, sp, NULL)) {
657 retval = -EADDRNOTAVAIL;
661 if (sa_addr->v4.sin_port &&
662 sa_addr->v4.sin_port != htons(bp->port)) {
667 if (!sa_addr->v4.sin_port)
668 sa_addr->v4.sin_port = htons(bp->port);
670 /* FIXME - There is probably a need to check if sk->sk_saddr and
671 * sk->sk_rcv_addr are currently set to one of the addresses to
672 * be removed. This is something which needs to be looked into
673 * when we are fixing the outstanding issues with multi-homing
674 * socket routing and failover schemes. Refer to comments in
675 * sctp_do_bind(). -daisy
677 retval = sctp_del_bind_addr(bp, sa_addr);
679 addr_buf += af->sockaddr_len;
682 /* Failed. Add the ones that has been removed back */
684 sctp_bindx_add(sk, addrs, cnt);
692 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
693 * the associations that are part of the endpoint indicating that a list of
694 * local addresses are removed from the endpoint.
696 * If any of the addresses is already in the bind address list of the
697 * association, we do not send the chunk for that association. But it will not
698 * affect other associations.
700 * Only sctp_setsockopt_bindx() is supposed to call this function.
702 static int sctp_send_asconf_del_ip(struct sock *sk,
703 struct sockaddr *addrs,
706 struct sctp_sock *sp;
707 struct sctp_endpoint *ep;
708 struct sctp_association *asoc;
709 struct sctp_transport *transport;
710 struct sctp_bind_addr *bp;
711 struct sctp_chunk *chunk;
712 union sctp_addr *laddr;
715 struct sctp_sockaddr_entry *saddr;
719 if (!sctp_addip_enable)
725 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
726 __func__, sk, addrs, addrcnt);
728 list_for_each_entry(asoc, &ep->asocs, asocs) {
730 if (!asoc->peer.asconf_capable)
733 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
736 if (!sctp_state(asoc, ESTABLISHED))
739 /* Check if any address in the packed array of addresses is
740 * not present in the bind address list of the association.
741 * If so, do not send the asconf chunk to its peer, but
742 * continue with other associations.
745 for (i = 0; i < addrcnt; i++) {
746 laddr = (union sctp_addr *)addr_buf;
747 af = sctp_get_af_specific(laddr->v4.sin_family);
753 if (!sctp_assoc_lookup_laddr(asoc, laddr))
756 addr_buf += af->sockaddr_len;
761 /* Find one address in the association's bind address list
762 * that is not in the packed array of addresses. This is to
763 * make sure that we do not delete all the addresses in the
766 bp = &asoc->base.bind_addr;
767 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
772 /* We do not need RCU protection throughout this loop
773 * because this is done under a socket lock from the
776 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
783 /* Reset use_as_src flag for the addresses in the bind address
784 * list that are to be deleted.
787 for (i = 0; i < addrcnt; i++) {
788 laddr = (union sctp_addr *)addr_buf;
789 af = sctp_get_af_specific(laddr->v4.sin_family);
790 list_for_each_entry(saddr, &bp->address_list, list) {
791 if (sctp_cmp_addr_exact(&saddr->a, laddr))
792 saddr->state = SCTP_ADDR_DEL;
794 addr_buf += af->sockaddr_len;
797 /* Update the route and saddr entries for all the transports
798 * as some of the addresses in the bind address list are
799 * about to be deleted and cannot be used as source addresses.
801 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
803 dst_release(transport->dst);
804 sctp_transport_route(transport, NULL,
805 sctp_sk(asoc->base.sk));
808 retval = sctp_send_asconf(asoc, chunk);
814 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
817 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
820 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
821 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
824 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
825 * Section 3.1.2 for this usage.
827 * addrs is a pointer to an array of one or more socket addresses. Each
828 * address is contained in its appropriate structure (i.e. struct
829 * sockaddr_in or struct sockaddr_in6) the family of the address type
830 * must be used to distinguish the address length (note that this
831 * representation is termed a "packed array" of addresses). The caller
832 * specifies the number of addresses in the array with addrcnt.
834 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
835 * -1, and sets errno to the appropriate error code.
837 * For SCTP, the port given in each socket address must be the same, or
838 * sctp_bindx() will fail, setting errno to EINVAL.
840 * The flags parameter is formed from the bitwise OR of zero or more of
841 * the following currently defined flags:
843 * SCTP_BINDX_ADD_ADDR
845 * SCTP_BINDX_REM_ADDR
847 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
848 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
849 * addresses from the association. The two flags are mutually exclusive;
850 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
851 * not remove all addresses from an association; sctp_bindx() will
852 * reject such an attempt with EINVAL.
854 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
855 * additional addresses with an endpoint after calling bind(). Or use
856 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
857 * socket is associated with so that no new association accepted will be
858 * associated with those addresses. If the endpoint supports dynamic
859 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
860 * endpoint to send the appropriate message to the peer to change the
861 * peers address lists.
863 * Adding and removing addresses from a connected association is
864 * optional functionality. Implementations that do not support this
865 * functionality should return EOPNOTSUPP.
867 * Basically do nothing but copying the addresses from user to kernel
868 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
869 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
872 * We don't use copy_from_user() for optimization: we first do the
873 * sanity checks (buffer size -fast- and access check-healthy
874 * pointer); if all of those succeed, then we can alloc the memory
875 * (expensive operation) needed to copy the data to kernel. Then we do
876 * the copying without checking the user space area
877 * (__copy_from_user()).
879 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
882 * sk The sk of the socket
883 * addrs The pointer to the addresses in user land
884 * addrssize Size of the addrs buffer
885 * op Operation to perform (add or remove, see the flags of
888 * Returns 0 if ok, <0 errno code on error.
890 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
891 struct sockaddr __user *addrs,
892 int addrs_size, int op)
894 struct sockaddr *kaddrs;
898 struct sockaddr *sa_addr;
902 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
903 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
905 if (unlikely(addrs_size <= 0))
908 /* Check the user passed a healthy pointer. */
909 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
912 /* Alloc space for the address array in kernel memory. */
913 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
914 if (unlikely(!kaddrs))
917 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
922 /* Walk through the addrs buffer and count the number of addresses. */
924 while (walk_size < addrs_size) {
925 if (walk_size + sizeof(sa_family_t) > addrs_size) {
930 sa_addr = (struct sockaddr *)addr_buf;
931 af = sctp_get_af_specific(sa_addr->sa_family);
933 /* If the address family is not supported or if this address
934 * causes the address buffer to overflow return EINVAL.
936 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
941 addr_buf += af->sockaddr_len;
942 walk_size += af->sockaddr_len;
947 case SCTP_BINDX_ADD_ADDR:
948 err = sctp_bindx_add(sk, kaddrs, addrcnt);
951 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
954 case SCTP_BINDX_REM_ADDR:
955 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
958 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
972 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
974 * Common routine for handling connect() and sctp_connectx().
975 * Connect will come in with just a single address.
977 static int __sctp_connect(struct sock* sk,
978 struct sockaddr *kaddrs,
980 sctp_assoc_t *assoc_id)
982 struct sctp_sock *sp;
983 struct sctp_endpoint *ep;
984 struct sctp_association *asoc = NULL;
985 struct sctp_association *asoc2;
986 struct sctp_transport *transport;
994 union sctp_addr *sa_addr = NULL;
997 unsigned int f_flags = 0;
1002 /* connect() cannot be done on a socket that is already in ESTABLISHED
1003 * state - UDP-style peeled off socket or a TCP-style socket that
1004 * is already connected.
1005 * It cannot be done even on a TCP-style listening socket.
1007 if (sctp_sstate(sk, ESTABLISHED) ||
1008 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1013 /* Walk through the addrs buffer and count the number of addresses. */
1015 while (walk_size < addrs_size) {
1016 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1021 sa_addr = (union sctp_addr *)addr_buf;
1022 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1024 /* If the address family is not supported or if this address
1025 * causes the address buffer to overflow return EINVAL.
1027 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1032 port = ntohs(sa_addr->v4.sin_port);
1034 /* Save current address so we can work with it */
1035 memcpy(&to, sa_addr, af->sockaddr_len);
1037 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1041 /* Make sure the destination port is correctly set
1044 if (asoc && asoc->peer.port && asoc->peer.port != port)
1048 /* Check if there already is a matching association on the
1049 * endpoint (other than the one created here).
1051 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1052 if (asoc2 && asoc2 != asoc) {
1053 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1060 /* If we could not find a matching association on the endpoint,
1061 * make sure that there is no peeled-off association matching
1062 * the peer address even on another socket.
1064 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1065 err = -EADDRNOTAVAIL;
1070 /* If a bind() or sctp_bindx() is not called prior to
1071 * an sctp_connectx() call, the system picks an
1072 * ephemeral port and will choose an address set
1073 * equivalent to binding with a wildcard address.
1075 if (!ep->base.bind_addr.port) {
1076 if (sctp_autobind(sk)) {
1082 * If an unprivileged user inherits a 1-many
1083 * style socket with open associations on a
1084 * privileged port, it MAY be permitted to
1085 * accept new associations, but it SHOULD NOT
1086 * be permitted to open new associations.
1088 if (ep->base.bind_addr.port < PROT_SOCK &&
1089 !capable(CAP_NET_BIND_SERVICE)) {
1095 scope = sctp_scope(&to);
1096 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1102 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1110 /* Prime the peer's transport structures. */
1111 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1119 addr_buf += af->sockaddr_len;
1120 walk_size += af->sockaddr_len;
1123 /* In case the user of sctp_connectx() wants an association
1124 * id back, assign one now.
1127 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1132 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1137 /* Initialize sk's dport and daddr for getpeername() */
1138 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1139 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1140 af->to_sk_daddr(sa_addr, sk);
1143 /* in-kernel sockets don't generally have a file allocated to them
1144 * if all they do is call sock_create_kern().
1146 if (sk->sk_socket->file)
1147 f_flags = sk->sk_socket->file->f_flags;
1149 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1151 err = sctp_wait_for_connect(asoc, &timeo);
1152 if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1153 *assoc_id = asoc->assoc_id;
1155 /* Don't free association on exit. */
1160 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1161 " kaddrs: %p err: %d\n",
1164 sctp_association_free(asoc);
1168 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1171 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1172 * sctp_assoc_t *asoc);
1174 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1175 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1176 * or IPv6 addresses.
1178 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1179 * Section 3.1.2 for this usage.
1181 * addrs is a pointer to an array of one or more socket addresses. Each
1182 * address is contained in its appropriate structure (i.e. struct
1183 * sockaddr_in or struct sockaddr_in6) the family of the address type
1184 * must be used to distengish the address length (note that this
1185 * representation is termed a "packed array" of addresses). The caller
1186 * specifies the number of addresses in the array with addrcnt.
1188 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1189 * the association id of the new association. On failure, sctp_connectx()
1190 * returns -1, and sets errno to the appropriate error code. The assoc_id
1191 * is not touched by the kernel.
1193 * For SCTP, the port given in each socket address must be the same, or
1194 * sctp_connectx() will fail, setting errno to EINVAL.
1196 * An application can use sctp_connectx to initiate an association with
1197 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1198 * allows a caller to specify multiple addresses at which a peer can be
1199 * reached. The way the SCTP stack uses the list of addresses to set up
1200 * the association is implementation dependent. This function only
1201 * specifies that the stack will try to make use of all the addresses in
1202 * the list when needed.
1204 * Note that the list of addresses passed in is only used for setting up
1205 * the association. It does not necessarily equal the set of addresses
1206 * the peer uses for the resulting association. If the caller wants to
1207 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1208 * retrieve them after the association has been set up.
1210 * Basically do nothing but copying the addresses from user to kernel
1211 * land and invoking either sctp_connectx(). This is used for tunneling
1212 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1214 * We don't use copy_from_user() for optimization: we first do the
1215 * sanity checks (buffer size -fast- and access check-healthy
1216 * pointer); if all of those succeed, then we can alloc the memory
1217 * (expensive operation) needed to copy the data to kernel. Then we do
1218 * the copying without checking the user space area
1219 * (__copy_from_user()).
1221 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1224 * sk The sk of the socket
1225 * addrs The pointer to the addresses in user land
1226 * addrssize Size of the addrs buffer
1228 * Returns >=0 if ok, <0 errno code on error.
1230 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1231 struct sockaddr __user *addrs,
1233 sctp_assoc_t *assoc_id)
1236 struct sockaddr *kaddrs;
1238 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1239 __func__, sk, addrs, addrs_size);
1241 if (unlikely(addrs_size <= 0))
1244 /* Check the user passed a healthy pointer. */
1245 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1248 /* Alloc space for the address array in kernel memory. */
1249 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1250 if (unlikely(!kaddrs))
1253 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1256 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1265 * This is an older interface. It's kept for backward compatibility
1266 * to the option that doesn't provide association id.
1268 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1269 struct sockaddr __user *addrs,
1272 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1276 * New interface for the API. The since the API is done with a socket
1277 * option, to make it simple we feed back the association id is as a return
1278 * indication to the call. Error is always negative and association id is
1281 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1282 struct sockaddr __user *addrs,
1285 sctp_assoc_t assoc_id = 0;
1288 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1297 * New (hopefully final) interface for the API.
1298 * We use the sctp_getaddrs_old structure so that use-space library
1299 * can avoid any unnecessary allocations. The only defferent part
1300 * is that we store the actual length of the address buffer into the
1301 * addrs_num structure member. That way we can re-use the existing
1304 SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1305 char __user *optval,
1308 struct sctp_getaddrs_old param;
1309 sctp_assoc_t assoc_id = 0;
1312 if (len < sizeof(param))
1315 if (copy_from_user(¶m, optval, sizeof(param)))
1318 err = __sctp_setsockopt_connectx(sk,
1319 (struct sockaddr __user *)param.addrs,
1320 param.addr_num, &assoc_id);
1322 if (err == 0 || err == -EINPROGRESS) {
1323 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1325 if (put_user(sizeof(assoc_id), optlen))
1332 /* API 3.1.4 close() - UDP Style Syntax
1333 * Applications use close() to perform graceful shutdown (as described in
1334 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1335 * by a UDP-style socket.
1339 * ret = close(int sd);
1341 * sd - the socket descriptor of the associations to be closed.
1343 * To gracefully shutdown a specific association represented by the
1344 * UDP-style socket, an application should use the sendmsg() call,
1345 * passing no user data, but including the appropriate flag in the
1346 * ancillary data (see Section xxxx).
1348 * If sd in the close() call is a branched-off socket representing only
1349 * one association, the shutdown is performed on that association only.
1351 * 4.1.6 close() - TCP Style Syntax
1353 * Applications use close() to gracefully close down an association.
1357 * int close(int sd);
1359 * sd - the socket descriptor of the association to be closed.
1361 * After an application calls close() on a socket descriptor, no further
1362 * socket operations will succeed on that descriptor.
1364 * API 7.1.4 SO_LINGER
1366 * An application using the TCP-style socket can use this option to
1367 * perform the SCTP ABORT primitive. The linger option structure is:
1370 * int l_onoff; // option on/off
1371 * int l_linger; // linger time
1374 * To enable the option, set l_onoff to 1. If the l_linger value is set
1375 * to 0, calling close() is the same as the ABORT primitive. If the
1376 * value is set to a negative value, the setsockopt() call will return
1377 * an error. If the value is set to a positive value linger_time, the
1378 * close() can be blocked for at most linger_time ms. If the graceful
1379 * shutdown phase does not finish during this period, close() will
1380 * return but the graceful shutdown phase continues in the system.
1382 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1384 struct sctp_endpoint *ep;
1385 struct sctp_association *asoc;
1386 struct list_head *pos, *temp;
1388 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1391 sk->sk_shutdown = SHUTDOWN_MASK;
1392 sk->sk_state = SCTP_SS_CLOSING;
1394 ep = sctp_sk(sk)->ep;
1396 /* Walk all associations on an endpoint. */
1397 list_for_each_safe(pos, temp, &ep->asocs) {
1398 asoc = list_entry(pos, struct sctp_association, asocs);
1400 if (sctp_style(sk, TCP)) {
1401 /* A closed association can still be in the list if
1402 * it belongs to a TCP-style listening socket that is
1403 * not yet accepted. If so, free it. If not, send an
1404 * ABORT or SHUTDOWN based on the linger options.
1406 if (sctp_state(asoc, CLOSED)) {
1407 sctp_unhash_established(asoc);
1408 sctp_association_free(asoc);
1413 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1414 struct sctp_chunk *chunk;
1416 chunk = sctp_make_abort_user(asoc, NULL, 0);
1418 sctp_primitive_ABORT(asoc, chunk);
1420 sctp_primitive_SHUTDOWN(asoc, NULL);
1423 /* Clean up any skbs sitting on the receive queue. */
1424 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1425 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1427 /* On a TCP-style socket, block for at most linger_time if set. */
1428 if (sctp_style(sk, TCP) && timeout)
1429 sctp_wait_for_close(sk, timeout);
1431 /* This will run the backlog queue. */
1432 sctp_release_sock(sk);
1434 /* Supposedly, no process has access to the socket, but
1435 * the net layers still may.
1437 sctp_local_bh_disable();
1438 sctp_bh_lock_sock(sk);
1440 /* Hold the sock, since sk_common_release() will put sock_put()
1441 * and we have just a little more cleanup.
1444 sk_common_release(sk);
1446 sctp_bh_unlock_sock(sk);
1447 sctp_local_bh_enable();
1451 SCTP_DBG_OBJCNT_DEC(sock);
1454 /* Handle EPIPE error. */
1455 static int sctp_error(struct sock *sk, int flags, int err)
1458 err = sock_error(sk) ? : -EPIPE;
1459 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1460 send_sig(SIGPIPE, current, 0);
1464 /* API 3.1.3 sendmsg() - UDP Style Syntax
1466 * An application uses sendmsg() and recvmsg() calls to transmit data to
1467 * and receive data from its peer.
1469 * ssize_t sendmsg(int socket, const struct msghdr *message,
1472 * socket - the socket descriptor of the endpoint.
1473 * message - pointer to the msghdr structure which contains a single
1474 * user message and possibly some ancillary data.
1476 * See Section 5 for complete description of the data
1479 * flags - flags sent or received with the user message, see Section
1480 * 5 for complete description of the flags.
1482 * Note: This function could use a rewrite especially when explicit
1483 * connect support comes in.
1485 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1487 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1489 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1490 struct msghdr *msg, size_t msg_len)
1492 struct sctp_sock *sp;
1493 struct sctp_endpoint *ep;
1494 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1495 struct sctp_transport *transport, *chunk_tp;
1496 struct sctp_chunk *chunk;
1498 struct sockaddr *msg_name = NULL;
1499 struct sctp_sndrcvinfo default_sinfo;
1500 struct sctp_sndrcvinfo *sinfo;
1501 struct sctp_initmsg *sinit;
1502 sctp_assoc_t associd = 0;
1503 sctp_cmsgs_t cmsgs = { NULL };
1507 __u16 sinfo_flags = 0;
1508 struct sctp_datamsg *datamsg;
1509 int msg_flags = msg->msg_flags;
1511 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1518 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1520 /* We cannot send a message over a TCP-style listening socket. */
1521 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1526 /* Parse out the SCTP CMSGs. */
1527 err = sctp_msghdr_parse(msg, &cmsgs);
1530 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1534 /* Fetch the destination address for this packet. This
1535 * address only selects the association--it is not necessarily
1536 * the address we will send to.
1537 * For a peeled-off socket, msg_name is ignored.
1539 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1540 int msg_namelen = msg->msg_namelen;
1542 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1547 if (msg_namelen > sizeof(to))
1548 msg_namelen = sizeof(to);
1549 memcpy(&to, msg->msg_name, msg_namelen);
1550 msg_name = msg->msg_name;
1556 /* Did the user specify SNDRCVINFO? */
1558 sinfo_flags = sinfo->sinfo_flags;
1559 associd = sinfo->sinfo_assoc_id;
1562 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1563 msg_len, sinfo_flags);
1565 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1566 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1571 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1572 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1573 * If SCTP_ABORT is set, the message length could be non zero with
1574 * the msg_iov set to the user abort reason.
1576 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1577 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1582 /* If SCTP_ADDR_OVER is set, there must be an address
1583 * specified in msg_name.
1585 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1592 SCTP_DEBUG_PRINTK("About to look up association.\n");
1596 /* If a msg_name has been specified, assume this is to be used. */
1598 /* Look for a matching association on the endpoint. */
1599 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1601 /* If we could not find a matching association on the
1602 * endpoint, make sure that it is not a TCP-style
1603 * socket that already has an association or there is
1604 * no peeled-off association on another socket.
1606 if ((sctp_style(sk, TCP) &&
1607 sctp_sstate(sk, ESTABLISHED)) ||
1608 sctp_endpoint_is_peeled_off(ep, &to)) {
1609 err = -EADDRNOTAVAIL;
1614 asoc = sctp_id2assoc(sk, associd);
1622 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1624 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1625 * socket that has an association in CLOSED state. This can
1626 * happen when an accepted socket has an association that is
1629 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1634 if (sinfo_flags & SCTP_EOF) {
1635 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1637 sctp_primitive_SHUTDOWN(asoc, NULL);
1641 if (sinfo_flags & SCTP_ABORT) {
1643 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1649 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1650 sctp_primitive_ABORT(asoc, chunk);
1656 /* Do we need to create the association? */
1658 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1660 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1665 /* Check for invalid stream against the stream counts,
1666 * either the default or the user specified stream counts.
1669 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1670 /* Check against the defaults. */
1671 if (sinfo->sinfo_stream >=
1672 sp->initmsg.sinit_num_ostreams) {
1677 /* Check against the requested. */
1678 if (sinfo->sinfo_stream >=
1679 sinit->sinit_num_ostreams) {
1687 * API 3.1.2 bind() - UDP Style Syntax
1688 * If a bind() or sctp_bindx() is not called prior to a
1689 * sendmsg() call that initiates a new association, the
1690 * system picks an ephemeral port and will choose an address
1691 * set equivalent to binding with a wildcard address.
1693 if (!ep->base.bind_addr.port) {
1694 if (sctp_autobind(sk)) {
1700 * If an unprivileged user inherits a one-to-many
1701 * style socket with open associations on a privileged
1702 * port, it MAY be permitted to accept new associations,
1703 * but it SHOULD NOT be permitted to open new
1706 if (ep->base.bind_addr.port < PROT_SOCK &&
1707 !capable(CAP_NET_BIND_SERVICE)) {
1713 scope = sctp_scope(&to);
1714 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1720 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1726 /* If the SCTP_INIT ancillary data is specified, set all
1727 * the association init values accordingly.
1730 if (sinit->sinit_num_ostreams) {
1731 asoc->c.sinit_num_ostreams =
1732 sinit->sinit_num_ostreams;
1734 if (sinit->sinit_max_instreams) {
1735 asoc->c.sinit_max_instreams =
1736 sinit->sinit_max_instreams;
1738 if (sinit->sinit_max_attempts) {
1739 asoc->max_init_attempts
1740 = sinit->sinit_max_attempts;
1742 if (sinit->sinit_max_init_timeo) {
1743 asoc->max_init_timeo =
1744 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1748 /* Prime the peer's transport structures. */
1749 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1756 /* ASSERT: we have a valid association at this point. */
1757 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1760 /* If the user didn't specify SNDRCVINFO, make up one with
1763 memset(&default_sinfo, 0, sizeof(default_sinfo));
1764 default_sinfo.sinfo_stream = asoc->default_stream;
1765 default_sinfo.sinfo_flags = asoc->default_flags;
1766 default_sinfo.sinfo_ppid = asoc->default_ppid;
1767 default_sinfo.sinfo_context = asoc->default_context;
1768 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1769 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1770 sinfo = &default_sinfo;
1773 /* API 7.1.7, the sndbuf size per association bounds the
1774 * maximum size of data that can be sent in a single send call.
1776 if (msg_len > sk->sk_sndbuf) {
1781 if (asoc->pmtu_pending)
1782 sctp_assoc_pending_pmtu(asoc);
1784 /* If fragmentation is disabled and the message length exceeds the
1785 * association fragmentation point, return EMSGSIZE. The I-D
1786 * does not specify what this error is, but this looks like
1789 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1795 /* Check for invalid stream. */
1796 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1802 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1803 if (!sctp_wspace(asoc)) {
1804 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1809 /* If an address is passed with the sendto/sendmsg call, it is used
1810 * to override the primary destination address in the TCP model, or
1811 * when SCTP_ADDR_OVER flag is set in the UDP model.
1813 if ((sctp_style(sk, TCP) && msg_name) ||
1814 (sinfo_flags & SCTP_ADDR_OVER)) {
1815 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1823 /* Auto-connect, if we aren't connected already. */
1824 if (sctp_state(asoc, CLOSED)) {
1825 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1828 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1831 /* Break the message into multiple chunks of maximum size. */
1832 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1838 /* Now send the (possibly) fragmented message. */
1839 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1840 sctp_chunk_hold(chunk);
1842 /* Do accounting for the write space. */
1843 sctp_set_owner_w(chunk);
1845 chunk->transport = chunk_tp;
1848 /* Send it to the lower layers. Note: all chunks
1849 * must either fail or succeed. The lower layer
1850 * works that way today. Keep it that way or this
1853 err = sctp_primitive_SEND(asoc, datamsg);
1854 /* Did the lower layer accept the chunk? */
1856 sctp_datamsg_free(datamsg);
1858 sctp_datamsg_put(datamsg);
1860 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1867 /* If we are already past ASSOCIATE, the lower
1868 * layers are responsible for association cleanup.
1874 sctp_association_free(asoc);
1876 sctp_release_sock(sk);
1879 return sctp_error(sk, msg_flags, err);
1886 err = sock_error(sk);
1896 /* This is an extended version of skb_pull() that removes the data from the
1897 * start of a skb even when data is spread across the list of skb's in the
1898 * frag_list. len specifies the total amount of data that needs to be removed.
1899 * when 'len' bytes could be removed from the skb, it returns 0.
1900 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1901 * could not be removed.
1903 static int sctp_skb_pull(struct sk_buff *skb, int len)
1905 struct sk_buff *list;
1906 int skb_len = skb_headlen(skb);
1909 if (len <= skb_len) {
1910 __skb_pull(skb, len);
1914 __skb_pull(skb, skb_len);
1916 skb_walk_frags(skb, list) {
1917 rlen = sctp_skb_pull(list, len);
1918 skb->len -= (len-rlen);
1919 skb->data_len -= (len-rlen);
1930 /* API 3.1.3 recvmsg() - UDP Style Syntax
1932 * ssize_t recvmsg(int socket, struct msghdr *message,
1935 * socket - the socket descriptor of the endpoint.
1936 * message - pointer to the msghdr structure which contains a single
1937 * user message and possibly some ancillary data.
1939 * See Section 5 for complete description of the data
1942 * flags - flags sent or received with the user message, see Section
1943 * 5 for complete description of the flags.
1945 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1947 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1948 struct msghdr *msg, size_t len, int noblock,
1949 int flags, int *addr_len)
1951 struct sctp_ulpevent *event = NULL;
1952 struct sctp_sock *sp = sctp_sk(sk);
1953 struct sk_buff *skb;
1958 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1959 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1960 "len", len, "knoblauch", noblock,
1961 "flags", flags, "addr_len", addr_len);
1965 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1970 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1974 /* Get the total length of the skb including any skb's in the
1983 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1985 event = sctp_skb2event(skb);
1990 sock_recv_ts_and_drops(msg, sk, skb);
1991 if (sctp_ulpevent_is_notification(event)) {
1992 msg->msg_flags |= MSG_NOTIFICATION;
1993 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1995 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1998 /* Check if we allow SCTP_SNDRCVINFO. */
1999 if (sp->subscribe.sctp_data_io_event)
2000 sctp_ulpevent_read_sndrcvinfo(event, msg);
2002 /* FIXME: we should be calling IP/IPv6 layers. */
2003 if (sk->sk_protinfo.af_inet.cmsg_flags)
2004 ip_cmsg_recv(msg, skb);
2009 /* If skb's length exceeds the user's buffer, update the skb and
2010 * push it back to the receive_queue so that the next call to
2011 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2013 if (skb_len > copied) {
2014 msg->msg_flags &= ~MSG_EOR;
2015 if (flags & MSG_PEEK)
2017 sctp_skb_pull(skb, copied);
2018 skb_queue_head(&sk->sk_receive_queue, skb);
2020 /* When only partial message is copied to the user, increase
2021 * rwnd by that amount. If all the data in the skb is read,
2022 * rwnd is updated when the event is freed.
2024 if (!sctp_ulpevent_is_notification(event))
2025 sctp_assoc_rwnd_increase(event->asoc, copied);
2027 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2028 (event->msg_flags & MSG_EOR))
2029 msg->msg_flags |= MSG_EOR;
2031 msg->msg_flags &= ~MSG_EOR;
2034 if (flags & MSG_PEEK) {
2035 /* Release the skb reference acquired after peeking the skb in
2036 * sctp_skb_recv_datagram().
2040 /* Free the event which includes releasing the reference to
2041 * the owner of the skb, freeing the skb and updating the
2044 sctp_ulpevent_free(event);
2047 sctp_release_sock(sk);
2051 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2053 * This option is a on/off flag. If enabled no SCTP message
2054 * fragmentation will be performed. Instead if a message being sent
2055 * exceeds the current PMTU size, the message will NOT be sent and
2056 * instead a error will be indicated to the user.
2058 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2059 char __user *optval,
2060 unsigned int optlen)
2064 if (optlen < sizeof(int))
2067 if (get_user(val, (int __user *)optval))
2070 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2075 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2076 unsigned int optlen)
2078 if (optlen > sizeof(struct sctp_event_subscribe))
2080 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2085 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2087 * This socket option is applicable to the UDP-style socket only. When
2088 * set it will cause associations that are idle for more than the
2089 * specified number of seconds to automatically close. An association
2090 * being idle is defined an association that has NOT sent or received
2091 * user data. The special value of '0' indicates that no automatic
2092 * close of any associations should be performed. The option expects an
2093 * integer defining the number of seconds of idle time before an
2094 * association is closed.
2096 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2097 unsigned int optlen)
2099 struct sctp_sock *sp = sctp_sk(sk);
2101 /* Applicable to UDP-style socket only */
2102 if (sctp_style(sk, TCP))
2104 if (optlen != sizeof(int))
2106 if (copy_from_user(&sp->autoclose, optval, optlen))
2108 /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
2109 sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ);
2114 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2116 * Applications can enable or disable heartbeats for any peer address of
2117 * an association, modify an address's heartbeat interval, force a
2118 * heartbeat to be sent immediately, and adjust the address's maximum
2119 * number of retransmissions sent before an address is considered
2120 * unreachable. The following structure is used to access and modify an
2121 * address's parameters:
2123 * struct sctp_paddrparams {
2124 * sctp_assoc_t spp_assoc_id;
2125 * struct sockaddr_storage spp_address;
2126 * uint32_t spp_hbinterval;
2127 * uint16_t spp_pathmaxrxt;
2128 * uint32_t spp_pathmtu;
2129 * uint32_t spp_sackdelay;
2130 * uint32_t spp_flags;
2133 * spp_assoc_id - (one-to-many style socket) This is filled in the
2134 * application, and identifies the association for
2136 * spp_address - This specifies which address is of interest.
2137 * spp_hbinterval - This contains the value of the heartbeat interval,
2138 * in milliseconds. If a value of zero
2139 * is present in this field then no changes are to
2140 * be made to this parameter.
2141 * spp_pathmaxrxt - This contains the maximum number of
2142 * retransmissions before this address shall be
2143 * considered unreachable. If a value of zero
2144 * is present in this field then no changes are to
2145 * be made to this parameter.
2146 * spp_pathmtu - When Path MTU discovery is disabled the value
2147 * specified here will be the "fixed" path mtu.
2148 * Note that if the spp_address field is empty
2149 * then all associations on this address will
2150 * have this fixed path mtu set upon them.
2152 * spp_sackdelay - When delayed sack is enabled, this value specifies
2153 * the number of milliseconds that sacks will be delayed
2154 * for. This value will apply to all addresses of an
2155 * association if the spp_address field is empty. Note
2156 * also, that if delayed sack is enabled and this
2157 * value is set to 0, no change is made to the last
2158 * recorded delayed sack timer value.
2160 * spp_flags - These flags are used to control various features
2161 * on an association. The flag field may contain
2162 * zero or more of the following options.
2164 * SPP_HB_ENABLE - Enable heartbeats on the
2165 * specified address. Note that if the address
2166 * field is empty all addresses for the association
2167 * have heartbeats enabled upon them.
2169 * SPP_HB_DISABLE - Disable heartbeats on the
2170 * speicifed address. Note that if the address
2171 * field is empty all addresses for the association
2172 * will have their heartbeats disabled. Note also
2173 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2174 * mutually exclusive, only one of these two should
2175 * be specified. Enabling both fields will have
2176 * undetermined results.
2178 * SPP_HB_DEMAND - Request a user initiated heartbeat
2179 * to be made immediately.
2181 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2182 * heartbeat delayis to be set to the value of 0
2185 * SPP_PMTUD_ENABLE - This field will enable PMTU
2186 * discovery upon the specified address. Note that
2187 * if the address feild is empty then all addresses
2188 * on the association are effected.
2190 * SPP_PMTUD_DISABLE - This field will disable PMTU
2191 * discovery upon the specified address. Note that
2192 * if the address feild is empty then all addresses
2193 * on the association are effected. Not also that
2194 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2195 * exclusive. Enabling both will have undetermined
2198 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2199 * on delayed sack. The time specified in spp_sackdelay
2200 * is used to specify the sack delay for this address. Note
2201 * that if spp_address is empty then all addresses will
2202 * enable delayed sack and take on the sack delay
2203 * value specified in spp_sackdelay.
2204 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2205 * off delayed sack. If the spp_address field is blank then
2206 * delayed sack is disabled for the entire association. Note
2207 * also that this field is mutually exclusive to
2208 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2211 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2212 struct sctp_transport *trans,
2213 struct sctp_association *asoc,
2214 struct sctp_sock *sp,
2217 int sackdelay_change)
2221 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2222 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2227 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2228 * this field is ignored. Note also that a value of zero indicates
2229 * the current setting should be left unchanged.
2231 if (params->spp_flags & SPP_HB_ENABLE) {
2233 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2234 * set. This lets us use 0 value when this flag
2237 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2238 params->spp_hbinterval = 0;
2240 if (params->spp_hbinterval ||
2241 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2244 msecs_to_jiffies(params->spp_hbinterval);
2247 msecs_to_jiffies(params->spp_hbinterval);
2249 sp->hbinterval = params->spp_hbinterval;
2256 trans->param_flags =
2257 (trans->param_flags & ~SPP_HB) | hb_change;
2260 (asoc->param_flags & ~SPP_HB) | hb_change;
2263 (sp->param_flags & ~SPP_HB) | hb_change;
2267 /* When Path MTU discovery is disabled the value specified here will
2268 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2269 * include the flag SPP_PMTUD_DISABLE for this field to have any
2272 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2274 trans->pathmtu = params->spp_pathmtu;
2275 sctp_assoc_sync_pmtu(asoc);
2277 asoc->pathmtu = params->spp_pathmtu;
2278 sctp_frag_point(asoc, params->spp_pathmtu);
2280 sp->pathmtu = params->spp_pathmtu;
2286 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2287 (params->spp_flags & SPP_PMTUD_ENABLE);
2288 trans->param_flags =
2289 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2291 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2292 sctp_assoc_sync_pmtu(asoc);
2296 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2299 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2303 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2304 * value of this field is ignored. Note also that a value of zero
2305 * indicates the current setting should be left unchanged.
2307 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2310 msecs_to_jiffies(params->spp_sackdelay);
2313 msecs_to_jiffies(params->spp_sackdelay);
2315 sp->sackdelay = params->spp_sackdelay;
2319 if (sackdelay_change) {
2321 trans->param_flags =
2322 (trans->param_flags & ~SPP_SACKDELAY) |
2326 (asoc->param_flags & ~SPP_SACKDELAY) |
2330 (sp->param_flags & ~SPP_SACKDELAY) |
2335 /* Note that a value of zero indicates the current setting should be
2338 if (params->spp_pathmaxrxt) {
2340 trans->pathmaxrxt = params->spp_pathmaxrxt;
2342 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2344 sp->pathmaxrxt = params->spp_pathmaxrxt;
2351 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2352 char __user *optval,
2353 unsigned int optlen)
2355 struct sctp_paddrparams params;
2356 struct sctp_transport *trans = NULL;
2357 struct sctp_association *asoc = NULL;
2358 struct sctp_sock *sp = sctp_sk(sk);
2360 int hb_change, pmtud_change, sackdelay_change;
2362 if (optlen != sizeof(struct sctp_paddrparams))
2365 if (copy_from_user(¶ms, optval, optlen))
2368 /* Validate flags and value parameters. */
2369 hb_change = params.spp_flags & SPP_HB;
2370 pmtud_change = params.spp_flags & SPP_PMTUD;
2371 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2373 if (hb_change == SPP_HB ||
2374 pmtud_change == SPP_PMTUD ||
2375 sackdelay_change == SPP_SACKDELAY ||
2376 params.spp_sackdelay > 500 ||
2377 (params.spp_pathmtu &&
2378 params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2381 /* If an address other than INADDR_ANY is specified, and
2382 * no transport is found, then the request is invalid.
2384 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
2385 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
2386 params.spp_assoc_id);
2391 /* Get association, if assoc_id != 0 and the socket is a one
2392 * to many style socket, and an association was not found, then
2393 * the id was invalid.
2395 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2396 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2399 /* Heartbeat demand can only be sent on a transport or
2400 * association, but not a socket.
2402 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2405 /* Process parameters. */
2406 error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2407 hb_change, pmtud_change,
2413 /* If changes are for association, also apply parameters to each
2416 if (!trans && asoc) {
2417 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2419 sctp_apply_peer_addr_params(¶ms, trans, asoc, sp,
2420 hb_change, pmtud_change,
2429 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2431 * This option will effect the way delayed acks are performed. This
2432 * option allows you to get or set the delayed ack time, in
2433 * milliseconds. It also allows changing the delayed ack frequency.
2434 * Changing the frequency to 1 disables the delayed sack algorithm. If
2435 * the assoc_id is 0, then this sets or gets the endpoints default
2436 * values. If the assoc_id field is non-zero, then the set or get
2437 * effects the specified association for the one to many model (the
2438 * assoc_id field is ignored by the one to one model). Note that if
2439 * sack_delay or sack_freq are 0 when setting this option, then the
2440 * current values will remain unchanged.
2442 * struct sctp_sack_info {
2443 * sctp_assoc_t sack_assoc_id;
2444 * uint32_t sack_delay;
2445 * uint32_t sack_freq;
2448 * sack_assoc_id - This parameter, indicates which association the user
2449 * is performing an action upon. Note that if this field's value is
2450 * zero then the endpoints default value is changed (effecting future
2451 * associations only).
2453 * sack_delay - This parameter contains the number of milliseconds that
2454 * the user is requesting the delayed ACK timer be set to. Note that
2455 * this value is defined in the standard to be between 200 and 500
2458 * sack_freq - This parameter contains the number of packets that must
2459 * be received before a sack is sent without waiting for the delay
2460 * timer to expire. The default value for this is 2, setting this
2461 * value to 1 will disable the delayed sack algorithm.
2464 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2465 char __user *optval, unsigned int optlen)
2467 struct sctp_sack_info params;
2468 struct sctp_transport *trans = NULL;
2469 struct sctp_association *asoc = NULL;
2470 struct sctp_sock *sp = sctp_sk(sk);
2472 if (optlen == sizeof(struct sctp_sack_info)) {
2473 if (copy_from_user(¶ms, optval, optlen))
2476 if (params.sack_delay == 0 && params.sack_freq == 0)
2478 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2479 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2480 pr_warn("Use struct sctp_sack_info instead\n");
2481 if (copy_from_user(¶ms, optval, optlen))
2484 if (params.sack_delay == 0)
2485 params.sack_freq = 1;
2487 params.sack_freq = 0;
2491 /* Validate value parameter. */
2492 if (params.sack_delay > 500)
2495 /* Get association, if sack_assoc_id != 0 and the socket is a one
2496 * to many style socket, and an association was not found, then
2497 * the id was invalid.
2499 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2500 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2503 if (params.sack_delay) {
2506 msecs_to_jiffies(params.sack_delay);
2508 (asoc->param_flags & ~SPP_SACKDELAY) |
2509 SPP_SACKDELAY_ENABLE;
2511 sp->sackdelay = params.sack_delay;
2513 (sp->param_flags & ~SPP_SACKDELAY) |
2514 SPP_SACKDELAY_ENABLE;
2518 if (params.sack_freq == 1) {
2521 (asoc->param_flags & ~SPP_SACKDELAY) |
2522 SPP_SACKDELAY_DISABLE;
2525 (sp->param_flags & ~SPP_SACKDELAY) |
2526 SPP_SACKDELAY_DISABLE;
2528 } else if (params.sack_freq > 1) {
2530 asoc->sackfreq = params.sack_freq;
2532 (asoc->param_flags & ~SPP_SACKDELAY) |
2533 SPP_SACKDELAY_ENABLE;
2535 sp->sackfreq = params.sack_freq;
2537 (sp->param_flags & ~SPP_SACKDELAY) |
2538 SPP_SACKDELAY_ENABLE;
2542 /* If change is for association, also apply to each transport. */
2544 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2546 if (params.sack_delay) {
2548 msecs_to_jiffies(params.sack_delay);
2549 trans->param_flags =
2550 (trans->param_flags & ~SPP_SACKDELAY) |
2551 SPP_SACKDELAY_ENABLE;
2553 if (params.sack_freq == 1) {
2554 trans->param_flags =
2555 (trans->param_flags & ~SPP_SACKDELAY) |
2556 SPP_SACKDELAY_DISABLE;
2557 } else if (params.sack_freq > 1) {
2558 trans->sackfreq = params.sack_freq;
2559 trans->param_flags =
2560 (trans->param_flags & ~SPP_SACKDELAY) |
2561 SPP_SACKDELAY_ENABLE;
2569 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2571 * Applications can specify protocol parameters for the default association
2572 * initialization. The option name argument to setsockopt() and getsockopt()
2575 * Setting initialization parameters is effective only on an unconnected
2576 * socket (for UDP-style sockets only future associations are effected
2577 * by the change). With TCP-style sockets, this option is inherited by
2578 * sockets derived from a listener socket.
2580 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2582 struct sctp_initmsg sinit;
2583 struct sctp_sock *sp = sctp_sk(sk);
2585 if (optlen != sizeof(struct sctp_initmsg))
2587 if (copy_from_user(&sinit, optval, optlen))
2590 if (sinit.sinit_num_ostreams)
2591 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2592 if (sinit.sinit_max_instreams)
2593 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2594 if (sinit.sinit_max_attempts)
2595 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2596 if (sinit.sinit_max_init_timeo)
2597 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2603 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2605 * Applications that wish to use the sendto() system call may wish to
2606 * specify a default set of parameters that would normally be supplied
2607 * through the inclusion of ancillary data. This socket option allows
2608 * such an application to set the default sctp_sndrcvinfo structure.
2609 * The application that wishes to use this socket option simply passes
2610 * in to this call the sctp_sndrcvinfo structure defined in Section
2611 * 5.2.2) The input parameters accepted by this call include
2612 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2613 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2614 * to this call if the caller is using the UDP model.
2616 static int sctp_setsockopt_default_send_param(struct sock *sk,
2617 char __user *optval,
2618 unsigned int optlen)
2620 struct sctp_sndrcvinfo info;
2621 struct sctp_association *asoc;
2622 struct sctp_sock *sp = sctp_sk(sk);
2624 if (optlen != sizeof(struct sctp_sndrcvinfo))
2626 if (copy_from_user(&info, optval, optlen))
2629 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2630 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2634 asoc->default_stream = info.sinfo_stream;
2635 asoc->default_flags = info.sinfo_flags;
2636 asoc->default_ppid = info.sinfo_ppid;
2637 asoc->default_context = info.sinfo_context;
2638 asoc->default_timetolive = info.sinfo_timetolive;
2640 sp->default_stream = info.sinfo_stream;
2641 sp->default_flags = info.sinfo_flags;
2642 sp->default_ppid = info.sinfo_ppid;
2643 sp->default_context = info.sinfo_context;
2644 sp->default_timetolive = info.sinfo_timetolive;
2650 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2652 * Requests that the local SCTP stack use the enclosed peer address as
2653 * the association primary. The enclosed address must be one of the
2654 * association peer's addresses.
2656 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2657 unsigned int optlen)
2659 struct sctp_prim prim;
2660 struct sctp_transport *trans;
2662 if (optlen != sizeof(struct sctp_prim))
2665 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2668 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2672 sctp_assoc_set_primary(trans->asoc, trans);
2678 * 7.1.5 SCTP_NODELAY
2680 * Turn on/off any Nagle-like algorithm. This means that packets are
2681 * generally sent as soon as possible and no unnecessary delays are
2682 * introduced, at the cost of more packets in the network. Expects an
2683 * integer boolean flag.
2685 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2686 unsigned int optlen)
2690 if (optlen < sizeof(int))
2692 if (get_user(val, (int __user *)optval))
2695 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2701 * 7.1.1 SCTP_RTOINFO
2703 * The protocol parameters used to initialize and bound retransmission
2704 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2705 * and modify these parameters.
2706 * All parameters are time values, in milliseconds. A value of 0, when
2707 * modifying the parameters, indicates that the current value should not
2711 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2713 struct sctp_rtoinfo rtoinfo;
2714 struct sctp_association *asoc;
2716 if (optlen != sizeof (struct sctp_rtoinfo))
2719 if (copy_from_user(&rtoinfo, optval, optlen))
2722 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2724 /* Set the values to the specific association */
2725 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2729 if (rtoinfo.srto_initial != 0)
2731 msecs_to_jiffies(rtoinfo.srto_initial);
2732 if (rtoinfo.srto_max != 0)
2733 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2734 if (rtoinfo.srto_min != 0)
2735 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2737 /* If there is no association or the association-id = 0
2738 * set the values to the endpoint.
2740 struct sctp_sock *sp = sctp_sk(sk);
2742 if (rtoinfo.srto_initial != 0)
2743 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2744 if (rtoinfo.srto_max != 0)
2745 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2746 if (rtoinfo.srto_min != 0)
2747 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2755 * 7.1.2 SCTP_ASSOCINFO
2757 * This option is used to tune the maximum retransmission attempts
2758 * of the association.
2759 * Returns an error if the new association retransmission value is
2760 * greater than the sum of the retransmission value of the peer.
2761 * See [SCTP] for more information.
2764 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2767 struct sctp_assocparams assocparams;
2768 struct sctp_association *asoc;
2770 if (optlen != sizeof(struct sctp_assocparams))
2772 if (copy_from_user(&assocparams, optval, optlen))
2775 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2777 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2780 /* Set the values to the specific association */
2782 if (assocparams.sasoc_asocmaxrxt != 0) {
2785 struct sctp_transport *peer_addr;
2787 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2789 path_sum += peer_addr->pathmaxrxt;
2793 /* Only validate asocmaxrxt if we have more than
2794 * one path/transport. We do this because path
2795 * retransmissions are only counted when we have more
2799 assocparams.sasoc_asocmaxrxt > path_sum)
2802 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2805 if (assocparams.sasoc_cookie_life != 0) {
2806 asoc->cookie_life.tv_sec =
2807 assocparams.sasoc_cookie_life / 1000;
2808 asoc->cookie_life.tv_usec =
2809 (assocparams.sasoc_cookie_life % 1000)
2813 /* Set the values to the endpoint */
2814 struct sctp_sock *sp = sctp_sk(sk);
2816 if (assocparams.sasoc_asocmaxrxt != 0)
2817 sp->assocparams.sasoc_asocmaxrxt =
2818 assocparams.sasoc_asocmaxrxt;
2819 if (assocparams.sasoc_cookie_life != 0)
2820 sp->assocparams.sasoc_cookie_life =
2821 assocparams.sasoc_cookie_life;
2827 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2829 * This socket option is a boolean flag which turns on or off mapped V4
2830 * addresses. If this option is turned on and the socket is type
2831 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2832 * If this option is turned off, then no mapping will be done of V4
2833 * addresses and a user will receive both PF_INET6 and PF_INET type
2834 * addresses on the socket.
2836 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2839 struct sctp_sock *sp = sctp_sk(sk);
2841 if (optlen < sizeof(int))
2843 if (get_user(val, (int __user *)optval))
2854 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2855 * This option will get or set the maximum size to put in any outgoing
2856 * SCTP DATA chunk. If a message is larger than this size it will be
2857 * fragmented by SCTP into the specified size. Note that the underlying
2858 * SCTP implementation may fragment into smaller sized chunks when the
2859 * PMTU of the underlying association is smaller than the value set by
2860 * the user. The default value for this option is '0' which indicates
2861 * the user is NOT limiting fragmentation and only the PMTU will effect
2862 * SCTP's choice of DATA chunk size. Note also that values set larger
2863 * than the maximum size of an IP datagram will effectively let SCTP
2864 * control fragmentation (i.e. the same as setting this option to 0).
2866 * The following structure is used to access and modify this parameter:
2868 * struct sctp_assoc_value {
2869 * sctp_assoc_t assoc_id;
2870 * uint32_t assoc_value;
2873 * assoc_id: This parameter is ignored for one-to-one style sockets.
2874 * For one-to-many style sockets this parameter indicates which
2875 * association the user is performing an action upon. Note that if
2876 * this field's value is zero then the endpoints default value is
2877 * changed (effecting future associations only).
2878 * assoc_value: This parameter specifies the maximum size in bytes.
2880 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2882 struct sctp_assoc_value params;
2883 struct sctp_association *asoc;
2884 struct sctp_sock *sp = sctp_sk(sk);
2887 if (optlen == sizeof(int)) {
2888 pr_warn("Use of int in maxseg socket option deprecated\n");
2889 pr_warn("Use struct sctp_assoc_value instead\n");
2890 if (copy_from_user(&val, optval, optlen))
2892 params.assoc_id = 0;
2893 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2894 if (copy_from_user(¶ms, optval, optlen))
2896 val = params.assoc_value;
2900 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2903 asoc = sctp_id2assoc(sk, params.assoc_id);
2904 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2909 val = asoc->pathmtu;
2910 val -= sp->pf->af->net_header_len;
2911 val -= sizeof(struct sctphdr) +
2912 sizeof(struct sctp_data_chunk);
2914 asoc->user_frag = val;
2915 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
2917 sp->user_frag = val;
2925 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2927 * Requests that the peer mark the enclosed address as the association
2928 * primary. The enclosed address must be one of the association's
2929 * locally bound addresses. The following structure is used to make a
2930 * set primary request:
2932 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2933 unsigned int optlen)
2935 struct sctp_sock *sp;
2936 struct sctp_association *asoc = NULL;
2937 struct sctp_setpeerprim prim;
2938 struct sctp_chunk *chunk;
2944 if (!sctp_addip_enable)
2947 if (optlen != sizeof(struct sctp_setpeerprim))
2950 if (copy_from_user(&prim, optval, optlen))
2953 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2957 if (!asoc->peer.asconf_capable)
2960 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2963 if (!sctp_state(asoc, ESTABLISHED))
2966 af = sctp_get_af_specific(prim.sspp_addr.ss_family);
2970 if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
2971 return -EADDRNOTAVAIL;
2973 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2974 return -EADDRNOTAVAIL;
2976 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2977 chunk = sctp_make_asconf_set_prim(asoc,
2978 (union sctp_addr *)&prim.sspp_addr);
2982 err = sctp_send_asconf(asoc, chunk);
2984 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2989 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2990 unsigned int optlen)
2992 struct sctp_setadaptation adaptation;
2994 if (optlen != sizeof(struct sctp_setadaptation))
2996 if (copy_from_user(&adaptation, optval, optlen))
2999 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3005 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3007 * The context field in the sctp_sndrcvinfo structure is normally only
3008 * used when a failed message is retrieved holding the value that was
3009 * sent down on the actual send call. This option allows the setting of
3010 * a default context on an association basis that will be received on
3011 * reading messages from the peer. This is especially helpful in the
3012 * one-2-many model for an application to keep some reference to an
3013 * internal state machine that is processing messages on the
3014 * association. Note that the setting of this value only effects
3015 * received messages from the peer and does not effect the value that is
3016 * saved with outbound messages.
3018 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3019 unsigned int optlen)
3021 struct sctp_assoc_value params;
3022 struct sctp_sock *sp;
3023 struct sctp_association *asoc;
3025 if (optlen != sizeof(struct sctp_assoc_value))
3027 if (copy_from_user(¶ms, optval, optlen))
3032 if (params.assoc_id != 0) {
3033 asoc = sctp_id2assoc(sk, params.assoc_id);
3036 asoc->default_rcv_context = params.assoc_value;
3038 sp->default_rcv_context = params.assoc_value;
3045 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3047 * This options will at a minimum specify if the implementation is doing
3048 * fragmented interleave. Fragmented interleave, for a one to many
3049 * socket, is when subsequent calls to receive a message may return
3050 * parts of messages from different associations. Some implementations
3051 * may allow you to turn this value on or off. If so, when turned off,
3052 * no fragment interleave will occur (which will cause a head of line
3053 * blocking amongst multiple associations sharing the same one to many
3054 * socket). When this option is turned on, then each receive call may
3055 * come from a different association (thus the user must receive data
3056 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3057 * association each receive belongs to.
3059 * This option takes a boolean value. A non-zero value indicates that
3060 * fragmented interleave is on. A value of zero indicates that
3061 * fragmented interleave is off.
3063 * Note that it is important that an implementation that allows this
3064 * option to be turned on, have it off by default. Otherwise an unaware
3065 * application using the one to many model may become confused and act
3068 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3069 char __user *optval,
3070 unsigned int optlen)
3074 if (optlen != sizeof(int))
3076 if (get_user(val, (int __user *)optval))
3079 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3085 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3086 * (SCTP_PARTIAL_DELIVERY_POINT)
3088 * This option will set or get the SCTP partial delivery point. This
3089 * point is the size of a message where the partial delivery API will be
3090 * invoked to help free up rwnd space for the peer. Setting this to a
3091 * lower value will cause partial deliveries to happen more often. The
3092 * calls argument is an integer that sets or gets the partial delivery
3093 * point. Note also that the call will fail if the user attempts to set
3094 * this value larger than the socket receive buffer size.
3096 * Note that any single message having a length smaller than or equal to
3097 * the SCTP partial delivery point will be delivered in one single read
3098 * call as long as the user provided buffer is large enough to hold the
3101 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3102 char __user *optval,
3103 unsigned int optlen)
3107 if (optlen != sizeof(u32))
3109 if (get_user(val, (int __user *)optval))
3112 /* Note: We double the receive buffer from what the user sets
3113 * it to be, also initial rwnd is based on rcvbuf/2.
3115 if (val > (sk->sk_rcvbuf >> 1))
3118 sctp_sk(sk)->pd_point = val;
3120 return 0; /* is this the right error code? */
3124 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3126 * This option will allow a user to change the maximum burst of packets
3127 * that can be emitted by this association. Note that the default value
3128 * is 4, and some implementations may restrict this setting so that it
3129 * can only be lowered.
3131 * NOTE: This text doesn't seem right. Do this on a socket basis with
3132 * future associations inheriting the socket value.
3134 static int sctp_setsockopt_maxburst(struct sock *sk,
3135 char __user *optval,
3136 unsigned int optlen)
3138 struct sctp_assoc_value params;
3139 struct sctp_sock *sp;
3140 struct sctp_association *asoc;
3144 if (optlen == sizeof(int)) {
3145 pr_warn("Use of int in max_burst socket option deprecated\n");
3146 pr_warn("Use struct sctp_assoc_value instead\n");
3147 if (copy_from_user(&val, optval, optlen))
3149 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3150 if (copy_from_user(¶ms, optval, optlen))
3152 val = params.assoc_value;
3153 assoc_id = params.assoc_id;
3159 if (assoc_id != 0) {
3160 asoc = sctp_id2assoc(sk, assoc_id);
3163 asoc->max_burst = val;
3165 sp->max_burst = val;
3171 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3173 * This set option adds a chunk type that the user is requesting to be
3174 * received only in an authenticated way. Changes to the list of chunks
3175 * will only effect future associations on the socket.
3177 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3178 char __user *optval,
3179 unsigned int optlen)
3181 struct sctp_authchunk val;
3183 if (!sctp_auth_enable)
3186 if (optlen != sizeof(struct sctp_authchunk))
3188 if (copy_from_user(&val, optval, optlen))
3191 switch (val.sauth_chunk) {
3193 case SCTP_CID_INIT_ACK:
3194 case SCTP_CID_SHUTDOWN_COMPLETE:
3199 /* add this chunk id to the endpoint */
3200 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3204 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3206 * This option gets or sets the list of HMAC algorithms that the local
3207 * endpoint requires the peer to use.
3209 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3210 char __user *optval,
3211 unsigned int optlen)
3213 struct sctp_hmacalgo *hmacs;
3217 if (!sctp_auth_enable)
3220 if (optlen < sizeof(struct sctp_hmacalgo))
3223 hmacs= memdup_user(optval, optlen);
3225 return PTR_ERR(hmacs);
3227 idents = hmacs->shmac_num_idents;
3228 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3229 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3234 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3241 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3243 * This option will set a shared secret key which is used to build an
3244 * association shared key.
3246 static int sctp_setsockopt_auth_key(struct sock *sk,
3247 char __user *optval,
3248 unsigned int optlen)
3250 struct sctp_authkey *authkey;
3251 struct sctp_association *asoc;
3254 if (!sctp_auth_enable)
3257 if (optlen <= sizeof(struct sctp_authkey))
3260 authkey= memdup_user(optval, optlen);
3261 if (IS_ERR(authkey))
3262 return PTR_ERR(authkey);
3264 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3269 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3270 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3275 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3282 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3284 * This option will get or set the active shared key to be used to build
3285 * the association shared key.
3287 static int sctp_setsockopt_active_key(struct sock *sk,
3288 char __user *optval,
3289 unsigned int optlen)
3291 struct sctp_authkeyid val;
3292 struct sctp_association *asoc;
3294 if (!sctp_auth_enable)
3297 if (optlen != sizeof(struct sctp_authkeyid))
3299 if (copy_from_user(&val, optval, optlen))
3302 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3303 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3306 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3307 val.scact_keynumber);
3311 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3313 * This set option will delete a shared secret key from use.
3315 static int sctp_setsockopt_del_key(struct sock *sk,
3316 char __user *optval,
3317 unsigned int optlen)
3319 struct sctp_authkeyid val;
3320 struct sctp_association *asoc;
3322 if (!sctp_auth_enable)
3325 if (optlen != sizeof(struct sctp_authkeyid))
3327 if (copy_from_user(&val, optval, optlen))
3330 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3331 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3334 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3335 val.scact_keynumber);
3340 /* API 6.2 setsockopt(), getsockopt()
3342 * Applications use setsockopt() and getsockopt() to set or retrieve
3343 * socket options. Socket options are used to change the default
3344 * behavior of sockets calls. They are described in Section 7.
3348 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3349 * int __user *optlen);
3350 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3353 * sd - the socket descript.
3354 * level - set to IPPROTO_SCTP for all SCTP options.
3355 * optname - the option name.
3356 * optval - the buffer to store the value of the option.
3357 * optlen - the size of the buffer.
3359 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3360 char __user *optval, unsigned int optlen)
3364 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3367 /* I can hardly begin to describe how wrong this is. This is
3368 * so broken as to be worse than useless. The API draft
3369 * REALLY is NOT helpful here... I am not convinced that the
3370 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3371 * are at all well-founded.
3373 if (level != SOL_SCTP) {
3374 struct sctp_af *af = sctp_sk(sk)->pf->af;
3375 retval = af->setsockopt(sk, level, optname, optval, optlen);
3382 case SCTP_SOCKOPT_BINDX_ADD:
3383 /* 'optlen' is the size of the addresses buffer. */
3384 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3385 optlen, SCTP_BINDX_ADD_ADDR);
3388 case SCTP_SOCKOPT_BINDX_REM:
3389 /* 'optlen' is the size of the addresses buffer. */
3390 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3391 optlen, SCTP_BINDX_REM_ADDR);
3394 case SCTP_SOCKOPT_CONNECTX_OLD:
3395 /* 'optlen' is the size of the addresses buffer. */
3396 retval = sctp_setsockopt_connectx_old(sk,
3397 (struct sockaddr __user *)optval,
3401 case SCTP_SOCKOPT_CONNECTX:
3402 /* 'optlen' is the size of the addresses buffer. */
3403 retval = sctp_setsockopt_connectx(sk,
3404 (struct sockaddr __user *)optval,
3408 case SCTP_DISABLE_FRAGMENTS:
3409 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3413 retval = sctp_setsockopt_events(sk, optval, optlen);
3416 case SCTP_AUTOCLOSE:
3417 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3420 case SCTP_PEER_ADDR_PARAMS:
3421 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3424 case SCTP_DELAYED_SACK:
3425 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3427 case SCTP_PARTIAL_DELIVERY_POINT:
3428 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3432 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3434 case SCTP_DEFAULT_SEND_PARAM:
3435 retval = sctp_setsockopt_default_send_param(sk, optval,
3438 case SCTP_PRIMARY_ADDR:
3439 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3441 case SCTP_SET_PEER_PRIMARY_ADDR:
3442 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3445 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3448 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3450 case SCTP_ASSOCINFO:
3451 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3453 case SCTP_I_WANT_MAPPED_V4_ADDR:
3454 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3457 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3459 case SCTP_ADAPTATION_LAYER:
3460 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3463 retval = sctp_setsockopt_context(sk, optval, optlen);
3465 case SCTP_FRAGMENT_INTERLEAVE:
3466 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3468 case SCTP_MAX_BURST:
3469 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3471 case SCTP_AUTH_CHUNK:
3472 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3474 case SCTP_HMAC_IDENT:
3475 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3478 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3480 case SCTP_AUTH_ACTIVE_KEY:
3481 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3483 case SCTP_AUTH_DELETE_KEY:
3484 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3487 retval = -ENOPROTOOPT;
3491 sctp_release_sock(sk);
3497 /* API 3.1.6 connect() - UDP Style Syntax
3499 * An application may use the connect() call in the UDP model to initiate an
3500 * association without sending data.
3504 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3506 * sd: the socket descriptor to have a new association added to.
3508 * nam: the address structure (either struct sockaddr_in or struct
3509 * sockaddr_in6 defined in RFC2553 [7]).
3511 * len: the size of the address.
3513 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3521 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3522 __func__, sk, addr, addr_len);
3524 /* Validate addr_len before calling common connect/connectx routine. */
3525 af = sctp_get_af_specific(addr->sa_family);
3526 if (!af || addr_len < af->sockaddr_len) {
3529 /* Pass correct addr len to common routine (so it knows there
3530 * is only one address being passed.
3532 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3535 sctp_release_sock(sk);
3539 /* FIXME: Write comments. */
3540 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3542 return -EOPNOTSUPP; /* STUB */
3545 /* 4.1.4 accept() - TCP Style Syntax
3547 * Applications use accept() call to remove an established SCTP
3548 * association from the accept queue of the endpoint. A new socket
3549 * descriptor will be returned from accept() to represent the newly
3550 * formed association.
3552 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3554 struct sctp_sock *sp;
3555 struct sctp_endpoint *ep;
3556 struct sock *newsk = NULL;
3557 struct sctp_association *asoc;
3566 if (!sctp_style(sk, TCP)) {
3567 error = -EOPNOTSUPP;
3571 if (!sctp_sstate(sk, LISTENING)) {
3576 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3578 error = sctp_wait_for_accept(sk, timeo);
3582 /* We treat the list of associations on the endpoint as the accept
3583 * queue and pick the first association on the list.
3585 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3587 newsk = sp->pf->create_accept_sk(sk, asoc);
3593 /* Populate the fields of the newsk from the oldsk and migrate the
3594 * asoc to the newsk.
3596 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3599 sctp_release_sock(sk);
3604 /* The SCTP ioctl handler. */
3605 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3612 * SEQPACKET-style sockets in LISTENING state are valid, for
3613 * SCTP, so only discard TCP-style sockets in LISTENING state.
3615 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3620 struct sk_buff *skb;
3621 unsigned int amount = 0;
3623 skb = skb_peek(&sk->sk_receive_queue);
3626 * We will only return the amount of this packet since
3627 * that is all that will be read.
3631 rc = put_user(amount, (int __user *)arg);
3639 sctp_release_sock(sk);
3643 /* This is the function which gets called during socket creation to
3644 * initialized the SCTP-specific portion of the sock.
3645 * The sock structure should already be zero-filled memory.
3647 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3649 struct sctp_endpoint *ep;
3650 struct sctp_sock *sp;
3652 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3656 /* Initialize the SCTP per socket area. */
3657 switch (sk->sk_type) {
3658 case SOCK_SEQPACKET:
3659 sp->type = SCTP_SOCKET_UDP;
3662 sp->type = SCTP_SOCKET_TCP;
3665 return -ESOCKTNOSUPPORT;
3668 /* Initialize default send parameters. These parameters can be
3669 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3671 sp->default_stream = 0;
3672 sp->default_ppid = 0;
3673 sp->default_flags = 0;
3674 sp->default_context = 0;
3675 sp->default_timetolive = 0;
3677 sp->default_rcv_context = 0;
3678 sp->max_burst = sctp_max_burst;
3680 /* Initialize default setup parameters. These parameters
3681 * can be modified with the SCTP_INITMSG socket option or
3682 * overridden by the SCTP_INIT CMSG.
3684 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3685 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3686 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3687 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3689 /* Initialize default RTO related parameters. These parameters can
3690 * be modified for with the SCTP_RTOINFO socket option.
3692 sp->rtoinfo.srto_initial = sctp_rto_initial;
3693 sp->rtoinfo.srto_max = sctp_rto_max;
3694 sp->rtoinfo.srto_min = sctp_rto_min;
3696 /* Initialize default association related parameters. These parameters
3697 * can be modified with the SCTP_ASSOCINFO socket option.
3699 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3700 sp->assocparams.sasoc_number_peer_destinations = 0;
3701 sp->assocparams.sasoc_peer_rwnd = 0;
3702 sp->assocparams.sasoc_local_rwnd = 0;
3703 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3705 /* Initialize default event subscriptions. By default, all the
3708 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3710 /* Default Peer Address Parameters. These defaults can
3711 * be modified via SCTP_PEER_ADDR_PARAMS
3713 sp->hbinterval = sctp_hb_interval;
3714 sp->pathmaxrxt = sctp_max_retrans_path;
3715 sp->pathmtu = 0; // allow default discovery
3716 sp->sackdelay = sctp_sack_timeout;
3718 sp->param_flags = SPP_HB_ENABLE |
3720 SPP_SACKDELAY_ENABLE;
3722 /* If enabled no SCTP message fragmentation will be performed.
3723 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3725 sp->disable_fragments = 0;
3727 /* Enable Nagle algorithm by default. */
3730 /* Enable by default. */
3733 /* Auto-close idle associations after the configured
3734 * number of seconds. A value of 0 disables this
3735 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3736 * for UDP-style sockets only.
3740 /* User specified fragmentation limit. */
3743 sp->adaptation_ind = 0;
3745 sp->pf = sctp_get_pf_specific(sk->sk_family);
3747 /* Control variables for partial data delivery. */
3748 atomic_set(&sp->pd_mode, 0);
3749 skb_queue_head_init(&sp->pd_lobby);
3750 sp->frag_interleave = 0;
3752 /* Create a per socket endpoint structure. Even if we
3753 * change the data structure relationships, this may still
3754 * be useful for storing pre-connect address information.
3756 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3763 SCTP_DBG_OBJCNT_INC(sock);
3766 percpu_counter_inc(&sctp_sockets_allocated);
3767 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3773 /* Cleanup any SCTP per socket resources. */
3774 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3776 struct sctp_endpoint *ep;
3778 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3780 /* Release our hold on the endpoint. */
3781 ep = sctp_sk(sk)->ep;
3782 sctp_endpoint_free(ep);
3784 percpu_counter_dec(&sctp_sockets_allocated);
3785 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3789 /* API 4.1.7 shutdown() - TCP Style Syntax
3790 * int shutdown(int socket, int how);
3792 * sd - the socket descriptor of the association to be closed.
3793 * how - Specifies the type of shutdown. The values are
3796 * Disables further receive operations. No SCTP
3797 * protocol action is taken.
3799 * Disables further send operations, and initiates
3800 * the SCTP shutdown sequence.
3802 * Disables further send and receive operations
3803 * and initiates the SCTP shutdown sequence.
3805 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3807 struct sctp_endpoint *ep;
3808 struct sctp_association *asoc;
3810 if (!sctp_style(sk, TCP))
3813 if (how & SEND_SHUTDOWN) {
3814 ep = sctp_sk(sk)->ep;
3815 if (!list_empty(&ep->asocs)) {
3816 asoc = list_entry(ep->asocs.next,
3817 struct sctp_association, asocs);
3818 sctp_primitive_SHUTDOWN(asoc, NULL);
3823 /* 7.2.1 Association Status (SCTP_STATUS)
3825 * Applications can retrieve current status information about an
3826 * association, including association state, peer receiver window size,
3827 * number of unacked data chunks, and number of data chunks pending
3828 * receipt. This information is read-only.
3830 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3831 char __user *optval,
3834 struct sctp_status status;
3835 struct sctp_association *asoc = NULL;
3836 struct sctp_transport *transport;
3837 sctp_assoc_t associd;
3840 if (len < sizeof(status)) {
3845 len = sizeof(status);
3846 if (copy_from_user(&status, optval, len)) {
3851 associd = status.sstat_assoc_id;
3852 asoc = sctp_id2assoc(sk, associd);
3858 transport = asoc->peer.primary_path;
3860 status.sstat_assoc_id = sctp_assoc2id(asoc);
3861 status.sstat_state = asoc->state;
3862 status.sstat_rwnd = asoc->peer.rwnd;
3863 status.sstat_unackdata = asoc->unack_data;
3865 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3866 status.sstat_instrms = asoc->c.sinit_max_instreams;
3867 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3868 status.sstat_fragmentation_point = asoc->frag_point;
3869 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3870 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3871 transport->af_specific->sockaddr_len);
3872 /* Map ipv4 address into v4-mapped-on-v6 address. */
3873 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3874 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3875 status.sstat_primary.spinfo_state = transport->state;
3876 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3877 status.sstat_primary.spinfo_srtt = transport->srtt;
3878 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3879 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3881 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3882 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3884 if (put_user(len, optlen)) {
3889 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3890 len, status.sstat_state, status.sstat_rwnd,
3891 status.sstat_assoc_id);
3893 if (copy_to_user(optval, &status, len)) {
3903 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3905 * Applications can retrieve information about a specific peer address
3906 * of an association, including its reachability state, congestion
3907 * window, and retransmission timer values. This information is
3910 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3911 char __user *optval,
3914 struct sctp_paddrinfo pinfo;
3915 struct sctp_transport *transport;
3918 if (len < sizeof(pinfo)) {
3923 len = sizeof(pinfo);
3924 if (copy_from_user(&pinfo, optval, len)) {
3929 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3930 pinfo.spinfo_assoc_id);
3934 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3935 pinfo.spinfo_state = transport->state;
3936 pinfo.spinfo_cwnd = transport->cwnd;
3937 pinfo.spinfo_srtt = transport->srtt;
3938 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3939 pinfo.spinfo_mtu = transport->pathmtu;
3941 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3942 pinfo.spinfo_state = SCTP_ACTIVE;
3944 if (put_user(len, optlen)) {
3949 if (copy_to_user(optval, &pinfo, len)) {
3958 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3960 * This option is a on/off flag. If enabled no SCTP message
3961 * fragmentation will be performed. Instead if a message being sent
3962 * exceeds the current PMTU size, the message will NOT be sent and
3963 * instead a error will be indicated to the user.
3965 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3966 char __user *optval, int __user *optlen)
3970 if (len < sizeof(int))
3974 val = (sctp_sk(sk)->disable_fragments == 1);
3975 if (put_user(len, optlen))
3977 if (copy_to_user(optval, &val, len))
3982 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3984 * This socket option is used to specify various notifications and
3985 * ancillary data the user wishes to receive.
3987 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3990 if (len < sizeof(struct sctp_event_subscribe))
3992 len = sizeof(struct sctp_event_subscribe);
3993 if (put_user(len, optlen))
3995 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4000 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4002 * This socket option is applicable to the UDP-style socket only. When
4003 * set it will cause associations that are idle for more than the
4004 * specified number of seconds to automatically close. An association
4005 * being idle is defined an association that has NOT sent or received
4006 * user data. The special value of '0' indicates that no automatic
4007 * close of any associations should be performed. The option expects an
4008 * integer defining the number of seconds of idle time before an
4009 * association is closed.
4011 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4013 /* Applicable to UDP-style socket only */
4014 if (sctp_style(sk, TCP))
4016 if (len < sizeof(int))
4019 if (put_user(len, optlen))
4021 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4026 /* Helper routine to branch off an association to a new socket. */
4027 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
4028 struct socket **sockp)
4030 struct sock *sk = asoc->base.sk;
4031 struct socket *sock;
4035 /* An association cannot be branched off from an already peeled-off
4036 * socket, nor is this supported for tcp style sockets.
4038 if (!sctp_style(sk, UDP))
4041 /* Create a new socket. */
4042 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4046 sctp_copy_sock(sock->sk, sk, asoc);
4048 /* Make peeled-off sockets more like 1-1 accepted sockets.
4049 * Set the daddr and initialize id to something more random
4051 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4052 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4054 /* Populate the fields of the newsk from the oldsk and migrate the
4055 * asoc to the newsk.
4057 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4064 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4066 sctp_peeloff_arg_t peeloff;
4067 struct socket *newsock;
4069 struct sctp_association *asoc;
4071 if (len < sizeof(sctp_peeloff_arg_t))
4073 len = sizeof(sctp_peeloff_arg_t);
4074 if (copy_from_user(&peeloff, optval, len))
4077 asoc = sctp_id2assoc(sk, peeloff.associd);
4083 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
4085 retval = sctp_do_peeloff(asoc, &newsock);
4089 /* Map the socket to an unused fd that can be returned to the user. */
4090 retval = sock_map_fd(newsock, 0);
4092 sock_release(newsock);
4096 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4097 __func__, sk, asoc, newsock->sk, retval);
4099 /* Return the fd mapped to the new socket. */
4100 peeloff.sd = retval;
4101 if (put_user(len, optlen))
4103 if (copy_to_user(optval, &peeloff, len))
4110 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4112 * Applications can enable or disable heartbeats for any peer address of
4113 * an association, modify an address's heartbeat interval, force a
4114 * heartbeat to be sent immediately, and adjust the address's maximum
4115 * number of retransmissions sent before an address is considered
4116 * unreachable. The following structure is used to access and modify an
4117 * address's parameters:
4119 * struct sctp_paddrparams {
4120 * sctp_assoc_t spp_assoc_id;
4121 * struct sockaddr_storage spp_address;
4122 * uint32_t spp_hbinterval;
4123 * uint16_t spp_pathmaxrxt;
4124 * uint32_t spp_pathmtu;
4125 * uint32_t spp_sackdelay;
4126 * uint32_t spp_flags;
4129 * spp_assoc_id - (one-to-many style socket) This is filled in the
4130 * application, and identifies the association for
4132 * spp_address - This specifies which address is of interest.
4133 * spp_hbinterval - This contains the value of the heartbeat interval,
4134 * in milliseconds. If a value of zero
4135 * is present in this field then no changes are to
4136 * be made to this parameter.
4137 * spp_pathmaxrxt - This contains the maximum number of
4138 * retransmissions before this address shall be
4139 * considered unreachable. If a value of zero
4140 * is present in this field then no changes are to
4141 * be made to this parameter.
4142 * spp_pathmtu - When Path MTU discovery is disabled the value
4143 * specified here will be the "fixed" path mtu.
4144 * Note that if the spp_address field is empty
4145 * then all associations on this address will
4146 * have this fixed path mtu set upon them.
4148 * spp_sackdelay - When delayed sack is enabled, this value specifies
4149 * the number of milliseconds that sacks will be delayed
4150 * for. This value will apply to all addresses of an
4151 * association if the spp_address field is empty. Note
4152 * also, that if delayed sack is enabled and this
4153 * value is set to 0, no change is made to the last
4154 * recorded delayed sack timer value.
4156 * spp_flags - These flags are used to control various features
4157 * on an association. The flag field may contain
4158 * zero or more of the following options.
4160 * SPP_HB_ENABLE - Enable heartbeats on the
4161 * specified address. Note that if the address
4162 * field is empty all addresses for the association
4163 * have heartbeats enabled upon them.
4165 * SPP_HB_DISABLE - Disable heartbeats on the
4166 * speicifed address. Note that if the address
4167 * field is empty all addresses for the association
4168 * will have their heartbeats disabled. Note also
4169 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4170 * mutually exclusive, only one of these two should
4171 * be specified. Enabling both fields will have
4172 * undetermined results.
4174 * SPP_HB_DEMAND - Request a user initiated heartbeat
4175 * to be made immediately.
4177 * SPP_PMTUD_ENABLE - This field will enable PMTU
4178 * discovery upon the specified address. Note that
4179 * if the address feild is empty then all addresses
4180 * on the association are effected.
4182 * SPP_PMTUD_DISABLE - This field will disable PMTU
4183 * discovery upon the specified address. Note that
4184 * if the address feild is empty then all addresses
4185 * on the association are effected. Not also that
4186 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4187 * exclusive. Enabling both will have undetermined
4190 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4191 * on delayed sack. The time specified in spp_sackdelay
4192 * is used to specify the sack delay for this address. Note
4193 * that if spp_address is empty then all addresses will
4194 * enable delayed sack and take on the sack delay
4195 * value specified in spp_sackdelay.
4196 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4197 * off delayed sack. If the spp_address field is blank then
4198 * delayed sack is disabled for the entire association. Note
4199 * also that this field is mutually exclusive to
4200 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4203 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4204 char __user *optval, int __user *optlen)
4206 struct sctp_paddrparams params;
4207 struct sctp_transport *trans = NULL;
4208 struct sctp_association *asoc = NULL;
4209 struct sctp_sock *sp = sctp_sk(sk);
4211 if (len < sizeof(struct sctp_paddrparams))
4213 len = sizeof(struct sctp_paddrparams);
4214 if (copy_from_user(¶ms, optval, len))
4217 /* If an address other than INADDR_ANY is specified, and
4218 * no transport is found, then the request is invalid.
4220 if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) {
4221 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
4222 params.spp_assoc_id);
4224 SCTP_DEBUG_PRINTK("Failed no transport\n");
4229 /* Get association, if assoc_id != 0 and the socket is a one
4230 * to many style socket, and an association was not found, then
4231 * the id was invalid.
4233 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4234 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4235 SCTP_DEBUG_PRINTK("Failed no association\n");
4240 /* Fetch transport values. */
4241 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4242 params.spp_pathmtu = trans->pathmtu;
4243 params.spp_pathmaxrxt = trans->pathmaxrxt;
4244 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4246 /*draft-11 doesn't say what to return in spp_flags*/
4247 params.spp_flags = trans->param_flags;
4249 /* Fetch association values. */
4250 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4251 params.spp_pathmtu = asoc->pathmtu;
4252 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4253 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4255 /*draft-11 doesn't say what to return in spp_flags*/
4256 params.spp_flags = asoc->param_flags;
4258 /* Fetch socket values. */
4259 params.spp_hbinterval = sp->hbinterval;
4260 params.spp_pathmtu = sp->pathmtu;
4261 params.spp_sackdelay = sp->sackdelay;
4262 params.spp_pathmaxrxt = sp->pathmaxrxt;
4264 /*draft-11 doesn't say what to return in spp_flags*/
4265 params.spp_flags = sp->param_flags;
4268 if (copy_to_user(optval, ¶ms, len))
4271 if (put_user(len, optlen))
4278 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4280 * This option will effect the way delayed acks are performed. This
4281 * option allows you to get or set the delayed ack time, in
4282 * milliseconds. It also allows changing the delayed ack frequency.
4283 * Changing the frequency to 1 disables the delayed sack algorithm. If
4284 * the assoc_id is 0, then this sets or gets the endpoints default
4285 * values. If the assoc_id field is non-zero, then the set or get
4286 * effects the specified association for the one to many model (the
4287 * assoc_id field is ignored by the one to one model). Note that if
4288 * sack_delay or sack_freq are 0 when setting this option, then the
4289 * current values will remain unchanged.
4291 * struct sctp_sack_info {
4292 * sctp_assoc_t sack_assoc_id;
4293 * uint32_t sack_delay;
4294 * uint32_t sack_freq;
4297 * sack_assoc_id - This parameter, indicates which association the user
4298 * is performing an action upon. Note that if this field's value is
4299 * zero then the endpoints default value is changed (effecting future
4300 * associations only).
4302 * sack_delay - This parameter contains the number of milliseconds that
4303 * the user is requesting the delayed ACK timer be set to. Note that
4304 * this value is defined in the standard to be between 200 and 500
4307 * sack_freq - This parameter contains the number of packets that must
4308 * be received before a sack is sent without waiting for the delay
4309 * timer to expire. The default value for this is 2, setting this
4310 * value to 1 will disable the delayed sack algorithm.
4312 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4313 char __user *optval,
4316 struct sctp_sack_info params;
4317 struct sctp_association *asoc = NULL;
4318 struct sctp_sock *sp = sctp_sk(sk);
4320 if (len >= sizeof(struct sctp_sack_info)) {
4321 len = sizeof(struct sctp_sack_info);
4323 if (copy_from_user(¶ms, optval, len))
4325 } else if (len == sizeof(struct sctp_assoc_value)) {
4326 pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4327 pr_warn("Use struct sctp_sack_info instead\n");
4328 if (copy_from_user(¶ms, optval, len))
4333 /* Get association, if sack_assoc_id != 0 and the socket is a one
4334 * to many style socket, and an association was not found, then
4335 * the id was invalid.
4337 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4338 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4342 /* Fetch association values. */
4343 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4344 params.sack_delay = jiffies_to_msecs(
4346 params.sack_freq = asoc->sackfreq;
4349 params.sack_delay = 0;
4350 params.sack_freq = 1;
4353 /* Fetch socket values. */
4354 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4355 params.sack_delay = sp->sackdelay;
4356 params.sack_freq = sp->sackfreq;
4358 params.sack_delay = 0;
4359 params.sack_freq = 1;
4363 if (copy_to_user(optval, ¶ms, len))
4366 if (put_user(len, optlen))
4372 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4374 * Applications can specify protocol parameters for the default association
4375 * initialization. The option name argument to setsockopt() and getsockopt()
4378 * Setting initialization parameters is effective only on an unconnected
4379 * socket (for UDP-style sockets only future associations are effected
4380 * by the change). With TCP-style sockets, this option is inherited by
4381 * sockets derived from a listener socket.
4383 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4385 if (len < sizeof(struct sctp_initmsg))
4387 len = sizeof(struct sctp_initmsg);
4388 if (put_user(len, optlen))
4390 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4396 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4397 char __user *optval, int __user *optlen)
4399 struct sctp_association *asoc;
4401 struct sctp_getaddrs getaddrs;
4402 struct sctp_transport *from;
4404 union sctp_addr temp;
4405 struct sctp_sock *sp = sctp_sk(sk);
4410 if (len < sizeof(struct sctp_getaddrs))
4413 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4416 /* For UDP-style sockets, id specifies the association to query. */
4417 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4421 to = optval + offsetof(struct sctp_getaddrs,addrs);
4422 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4424 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4426 memcpy(&temp, &from->ipaddr, sizeof(temp));
4427 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4428 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4429 if (space_left < addrlen)
4431 if (copy_to_user(to, &temp, addrlen))
4435 space_left -= addrlen;
4438 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4440 bytes_copied = ((char __user *)to) - optval;
4441 if (put_user(bytes_copied, optlen))
4447 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4448 size_t space_left, int *bytes_copied)
4450 struct sctp_sockaddr_entry *addr;
4451 union sctp_addr temp;
4456 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4460 if ((PF_INET == sk->sk_family) &&
4461 (AF_INET6 == addr->a.sa.sa_family))
4463 if ((PF_INET6 == sk->sk_family) &&
4464 inet_v6_ipv6only(sk) &&
4465 (AF_INET == addr->a.sa.sa_family))
4467 memcpy(&temp, &addr->a, sizeof(temp));
4468 if (!temp.v4.sin_port)
4469 temp.v4.sin_port = htons(port);
4471 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4473 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4474 if (space_left < addrlen) {
4478 memcpy(to, &temp, addrlen);
4482 space_left -= addrlen;
4483 *bytes_copied += addrlen;
4491 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4492 char __user *optval, int __user *optlen)
4494 struct sctp_bind_addr *bp;
4495 struct sctp_association *asoc;
4497 struct sctp_getaddrs getaddrs;
4498 struct sctp_sockaddr_entry *addr;
4500 union sctp_addr temp;
4501 struct sctp_sock *sp = sctp_sk(sk);
4505 int bytes_copied = 0;
4509 if (len < sizeof(struct sctp_getaddrs))
4512 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4516 * For UDP-style sockets, id specifies the association to query.
4517 * If the id field is set to the value '0' then the locally bound
4518 * addresses are returned without regard to any particular
4521 if (0 == getaddrs.assoc_id) {
4522 bp = &sctp_sk(sk)->ep->base.bind_addr;
4524 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4527 bp = &asoc->base.bind_addr;
4530 to = optval + offsetof(struct sctp_getaddrs,addrs);
4531 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4533 addrs = kmalloc(space_left, GFP_KERNEL);
4537 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4538 * addresses from the global local address list.
4540 if (sctp_list_single_entry(&bp->address_list)) {
4541 addr = list_entry(bp->address_list.next,
4542 struct sctp_sockaddr_entry, list);
4543 if (sctp_is_any(sk, &addr->a)) {
4544 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4545 space_left, &bytes_copied);
4555 /* Protection on the bound address list is not needed since
4556 * in the socket option context we hold a socket lock and
4557 * thus the bound address list can't change.
4559 list_for_each_entry(addr, &bp->address_list, list) {
4560 memcpy(&temp, &addr->a, sizeof(temp));
4561 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4562 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4563 if (space_left < addrlen) {
4564 err = -ENOMEM; /*fixme: right error?*/
4567 memcpy(buf, &temp, addrlen);
4569 bytes_copied += addrlen;
4571 space_left -= addrlen;
4575 if (copy_to_user(to, addrs, bytes_copied)) {
4579 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4583 if (put_user(bytes_copied, optlen))
4590 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4592 * Requests that the local SCTP stack use the enclosed peer address as
4593 * the association primary. The enclosed address must be one of the
4594 * association peer's addresses.
4596 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4597 char __user *optval, int __user *optlen)
4599 struct sctp_prim prim;
4600 struct sctp_association *asoc;
4601 struct sctp_sock *sp = sctp_sk(sk);
4603 if (len < sizeof(struct sctp_prim))
4606 len = sizeof(struct sctp_prim);
4608 if (copy_from_user(&prim, optval, len))
4611 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4615 if (!asoc->peer.primary_path)
4618 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4619 asoc->peer.primary_path->af_specific->sockaddr_len);
4621 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4622 (union sctp_addr *)&prim.ssp_addr);
4624 if (put_user(len, optlen))
4626 if (copy_to_user(optval, &prim, len))
4633 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4635 * Requests that the local endpoint set the specified Adaptation Layer
4636 * Indication parameter for all future INIT and INIT-ACK exchanges.
4638 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4639 char __user *optval, int __user *optlen)
4641 struct sctp_setadaptation adaptation;
4643 if (len < sizeof(struct sctp_setadaptation))
4646 len = sizeof(struct sctp_setadaptation);
4648 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4650 if (put_user(len, optlen))
4652 if (copy_to_user(optval, &adaptation, len))
4660 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4662 * Applications that wish to use the sendto() system call may wish to
4663 * specify a default set of parameters that would normally be supplied
4664 * through the inclusion of ancillary data. This socket option allows
4665 * such an application to set the default sctp_sndrcvinfo structure.
4668 * The application that wishes to use this socket option simply passes
4669 * in to this call the sctp_sndrcvinfo structure defined in Section
4670 * 5.2.2) The input parameters accepted by this call include
4671 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4672 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4673 * to this call if the caller is using the UDP model.
4675 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4677 static int sctp_getsockopt_default_send_param(struct sock *sk,
4678 int len, char __user *optval,
4681 struct sctp_sndrcvinfo info;
4682 struct sctp_association *asoc;
4683 struct sctp_sock *sp = sctp_sk(sk);
4685 if (len < sizeof(struct sctp_sndrcvinfo))
4688 len = sizeof(struct sctp_sndrcvinfo);
4690 if (copy_from_user(&info, optval, len))
4693 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4694 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4698 info.sinfo_stream = asoc->default_stream;
4699 info.sinfo_flags = asoc->default_flags;
4700 info.sinfo_ppid = asoc->default_ppid;
4701 info.sinfo_context = asoc->default_context;
4702 info.sinfo_timetolive = asoc->default_timetolive;
4704 info.sinfo_stream = sp->default_stream;
4705 info.sinfo_flags = sp->default_flags;
4706 info.sinfo_ppid = sp->default_ppid;
4707 info.sinfo_context = sp->default_context;
4708 info.sinfo_timetolive = sp->default_timetolive;
4711 if (put_user(len, optlen))
4713 if (copy_to_user(optval, &info, len))
4721 * 7.1.5 SCTP_NODELAY
4723 * Turn on/off any Nagle-like algorithm. This means that packets are
4724 * generally sent as soon as possible and no unnecessary delays are
4725 * introduced, at the cost of more packets in the network. Expects an
4726 * integer boolean flag.
4729 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4730 char __user *optval, int __user *optlen)
4734 if (len < sizeof(int))
4738 val = (sctp_sk(sk)->nodelay == 1);
4739 if (put_user(len, optlen))
4741 if (copy_to_user(optval, &val, len))
4748 * 7.1.1 SCTP_RTOINFO
4750 * The protocol parameters used to initialize and bound retransmission
4751 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4752 * and modify these parameters.
4753 * All parameters are time values, in milliseconds. A value of 0, when
4754 * modifying the parameters, indicates that the current value should not
4758 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4759 char __user *optval,
4760 int __user *optlen) {
4761 struct sctp_rtoinfo rtoinfo;
4762 struct sctp_association *asoc;
4764 if (len < sizeof (struct sctp_rtoinfo))
4767 len = sizeof(struct sctp_rtoinfo);
4769 if (copy_from_user(&rtoinfo, optval, len))
4772 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4774 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4777 /* Values corresponding to the specific association. */
4779 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
4780 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
4781 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
4783 /* Values corresponding to the endpoint. */
4784 struct sctp_sock *sp = sctp_sk(sk);
4786 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
4787 rtoinfo.srto_max = sp->rtoinfo.srto_max;
4788 rtoinfo.srto_min = sp->rtoinfo.srto_min;
4791 if (put_user(len, optlen))
4794 if (copy_to_user(optval, &rtoinfo, len))
4802 * 7.1.2 SCTP_ASSOCINFO
4804 * This option is used to tune the maximum retransmission attempts
4805 * of the association.
4806 * Returns an error if the new association retransmission value is
4807 * greater than the sum of the retransmission value of the peer.
4808 * See [SCTP] for more information.
4811 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
4812 char __user *optval,
4816 struct sctp_assocparams assocparams;
4817 struct sctp_association *asoc;
4818 struct list_head *pos;
4821 if (len < sizeof (struct sctp_assocparams))
4824 len = sizeof(struct sctp_assocparams);
4826 if (copy_from_user(&assocparams, optval, len))
4829 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
4831 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
4834 /* Values correspoinding to the specific association */
4836 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
4837 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
4838 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
4839 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
4841 (asoc->cookie_life.tv_usec
4844 list_for_each(pos, &asoc->peer.transport_addr_list) {
4848 assocparams.sasoc_number_peer_destinations = cnt;
4850 /* Values corresponding to the endpoint */
4851 struct sctp_sock *sp = sctp_sk(sk);
4853 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
4854 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
4855 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
4856 assocparams.sasoc_cookie_life =
4857 sp->assocparams.sasoc_cookie_life;
4858 assocparams.sasoc_number_peer_destinations =
4860 sasoc_number_peer_destinations;
4863 if (put_user(len, optlen))
4866 if (copy_to_user(optval, &assocparams, len))
4873 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
4875 * This socket option is a boolean flag which turns on or off mapped V4
4876 * addresses. If this option is turned on and the socket is type
4877 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
4878 * If this option is turned off, then no mapping will be done of V4
4879 * addresses and a user will receive both PF_INET6 and PF_INET type
4880 * addresses on the socket.
4882 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
4883 char __user *optval, int __user *optlen)
4886 struct sctp_sock *sp = sctp_sk(sk);
4888 if (len < sizeof(int))
4893 if (put_user(len, optlen))
4895 if (copy_to_user(optval, &val, len))
4902 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
4903 * (chapter and verse is quoted at sctp_setsockopt_context())
4905 static int sctp_getsockopt_context(struct sock *sk, int len,
4906 char __user *optval, int __user *optlen)
4908 struct sctp_assoc_value params;
4909 struct sctp_sock *sp;
4910 struct sctp_association *asoc;
4912 if (len < sizeof(struct sctp_assoc_value))
4915 len = sizeof(struct sctp_assoc_value);
4917 if (copy_from_user(¶ms, optval, len))
4922 if (params.assoc_id != 0) {
4923 asoc = sctp_id2assoc(sk, params.assoc_id);
4926 params.assoc_value = asoc->default_rcv_context;
4928 params.assoc_value = sp->default_rcv_context;
4931 if (put_user(len, optlen))
4933 if (copy_to_user(optval, ¶ms, len))
4940 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
4941 * This option will get or set the maximum size to put in any outgoing
4942 * SCTP DATA chunk. If a message is larger than this size it will be
4943 * fragmented by SCTP into the specified size. Note that the underlying
4944 * SCTP implementation may fragment into smaller sized chunks when the
4945 * PMTU of the underlying association is smaller than the value set by
4946 * the user. The default value for this option is '0' which indicates
4947 * the user is NOT limiting fragmentation and only the PMTU will effect
4948 * SCTP's choice of DATA chunk size. Note also that values set larger
4949 * than the maximum size of an IP datagram will effectively let SCTP
4950 * control fragmentation (i.e. the same as setting this option to 0).
4952 * The following structure is used to access and modify this parameter:
4954 * struct sctp_assoc_value {
4955 * sctp_assoc_t assoc_id;
4956 * uint32_t assoc_value;
4959 * assoc_id: This parameter is ignored for one-to-one style sockets.
4960 * For one-to-many style sockets this parameter indicates which
4961 * association the user is performing an action upon. Note that if
4962 * this field's value is zero then the endpoints default value is
4963 * changed (effecting future associations only).
4964 * assoc_value: This parameter specifies the maximum size in bytes.
4966 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
4967 char __user *optval, int __user *optlen)
4969 struct sctp_assoc_value params;
4970 struct sctp_association *asoc;
4972 if (len == sizeof(int)) {
4973 pr_warn("Use of int in maxseg socket option deprecated\n");
4974 pr_warn("Use struct sctp_assoc_value instead\n");
4975 params.assoc_id = 0;
4976 } else if (len >= sizeof(struct sctp_assoc_value)) {
4977 len = sizeof(struct sctp_assoc_value);
4978 if (copy_from_user(¶ms, optval, sizeof(params)))
4983 asoc = sctp_id2assoc(sk, params.assoc_id);
4984 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
4988 params.assoc_value = asoc->frag_point;
4990 params.assoc_value = sctp_sk(sk)->user_frag;
4992 if (put_user(len, optlen))
4994 if (len == sizeof(int)) {
4995 if (copy_to_user(optval, ¶ms.assoc_value, len))
4998 if (copy_to_user(optval, ¶ms, len))
5006 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5007 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5009 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5010 char __user *optval, int __user *optlen)
5014 if (len < sizeof(int))
5019 val = sctp_sk(sk)->frag_interleave;
5020 if (put_user(len, optlen))
5022 if (copy_to_user(optval, &val, len))
5029 * 7.1.25. Set or Get the sctp partial delivery point
5030 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5032 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5033 char __user *optval,
5038 if (len < sizeof(u32))
5043 val = sctp_sk(sk)->pd_point;
5044 if (put_user(len, optlen))
5046 if (copy_to_user(optval, &val, len))
5053 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5054 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5056 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5057 char __user *optval,
5060 struct sctp_assoc_value params;
5061 struct sctp_sock *sp;
5062 struct sctp_association *asoc;
5064 if (len == sizeof(int)) {
5065 pr_warn("Use of int in max_burst socket option deprecated\n");
5066 pr_warn("Use struct sctp_assoc_value instead\n");
5067 params.assoc_id = 0;
5068 } else if (len >= sizeof(struct sctp_assoc_value)) {
5069 len = sizeof(struct sctp_assoc_value);
5070 if (copy_from_user(¶ms, optval, len))
5077 if (params.assoc_id != 0) {
5078 asoc = sctp_id2assoc(sk, params.assoc_id);
5081 params.assoc_value = asoc->max_burst;
5083 params.assoc_value = sp->max_burst;
5085 if (len == sizeof(int)) {
5086 if (copy_to_user(optval, ¶ms.assoc_value, len))
5089 if (copy_to_user(optval, ¶ms, len))
5097 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5098 char __user *optval, int __user *optlen)
5100 struct sctp_hmacalgo __user *p = (void __user *)optval;
5101 struct sctp_hmac_algo_param *hmacs;
5105 if (!sctp_auth_enable)
5108 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5109 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5111 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5114 len = sizeof(struct sctp_hmacalgo) + data_len;
5115 num_idents = data_len / sizeof(u16);
5117 if (put_user(len, optlen))
5119 if (put_user(num_idents, &p->shmac_num_idents))
5121 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5126 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5127 char __user *optval, int __user *optlen)
5129 struct sctp_authkeyid val;
5130 struct sctp_association *asoc;
5132 if (!sctp_auth_enable)
5135 if (len < sizeof(struct sctp_authkeyid))
5137 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5140 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5141 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5145 val.scact_keynumber = asoc->active_key_id;
5147 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5149 len = sizeof(struct sctp_authkeyid);
5150 if (put_user(len, optlen))
5152 if (copy_to_user(optval, &val, len))
5158 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5159 char __user *optval, int __user *optlen)
5161 struct sctp_authchunks __user *p = (void __user *)optval;
5162 struct sctp_authchunks val;
5163 struct sctp_association *asoc;
5164 struct sctp_chunks_param *ch;
5168 if (!sctp_auth_enable)
5171 if (len < sizeof(struct sctp_authchunks))
5174 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5177 to = p->gauth_chunks;
5178 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5182 ch = asoc->peer.peer_chunks;
5186 /* See if the user provided enough room for all the data */
5187 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5188 if (len < num_chunks)
5191 if (copy_to_user(to, ch->chunks, num_chunks))
5194 len = sizeof(struct sctp_authchunks) + num_chunks;
5195 if (put_user(len, optlen)) return -EFAULT;
5196 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5201 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5202 char __user *optval, int __user *optlen)
5204 struct sctp_authchunks __user *p = (void __user *)optval;
5205 struct sctp_authchunks val;
5206 struct sctp_association *asoc;
5207 struct sctp_chunks_param *ch;
5211 if (!sctp_auth_enable)
5214 if (len < sizeof(struct sctp_authchunks))
5217 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5220 to = p->gauth_chunks;
5221 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5222 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5226 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5228 ch = sctp_sk(sk)->ep->auth_chunk_list;
5233 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5234 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5237 if (copy_to_user(to, ch->chunks, num_chunks))
5240 len = sizeof(struct sctp_authchunks) + num_chunks;
5241 if (put_user(len, optlen))
5243 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5250 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5251 * This option gets the current number of associations that are attached
5252 * to a one-to-many style socket. The option value is an uint32_t.
5254 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5255 char __user *optval, int __user *optlen)
5257 struct sctp_sock *sp = sctp_sk(sk);
5258 struct sctp_association *asoc;
5261 if (sctp_style(sk, TCP))
5264 if (len < sizeof(u32))
5269 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5273 if (put_user(len, optlen))
5275 if (copy_to_user(optval, &val, len))
5282 * 8.2.6. Get the Current Identifiers of Associations
5283 * (SCTP_GET_ASSOC_ID_LIST)
5285 * This option gets the current list of SCTP association identifiers of
5286 * the SCTP associations handled by a one-to-many style socket.
5288 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5289 char __user *optval, int __user *optlen)
5291 struct sctp_sock *sp = sctp_sk(sk);
5292 struct sctp_association *asoc;
5293 struct sctp_assoc_ids *ids;
5296 if (sctp_style(sk, TCP))
5299 if (len < sizeof(struct sctp_assoc_ids))
5302 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5306 if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5309 len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5311 ids = kmalloc(len, GFP_KERNEL);
5315 ids->gaids_number_of_ids = num;
5317 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5318 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5321 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5330 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5331 char __user *optval, int __user *optlen)
5336 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5339 /* I can hardly begin to describe how wrong this is. This is
5340 * so broken as to be worse than useless. The API draft
5341 * REALLY is NOT helpful here... I am not convinced that the
5342 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5343 * are at all well-founded.
5345 if (level != SOL_SCTP) {
5346 struct sctp_af *af = sctp_sk(sk)->pf->af;
5348 retval = af->getsockopt(sk, level, optname, optval, optlen);
5352 if (get_user(len, optlen))
5359 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5361 case SCTP_DISABLE_FRAGMENTS:
5362 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5366 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5368 case SCTP_AUTOCLOSE:
5369 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5371 case SCTP_SOCKOPT_PEELOFF:
5372 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5374 case SCTP_PEER_ADDR_PARAMS:
5375 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5378 case SCTP_DELAYED_SACK:
5379 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5383 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5385 case SCTP_GET_PEER_ADDRS:
5386 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5389 case SCTP_GET_LOCAL_ADDRS:
5390 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5393 case SCTP_SOCKOPT_CONNECTX3:
5394 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
5396 case SCTP_DEFAULT_SEND_PARAM:
5397 retval = sctp_getsockopt_default_send_param(sk, len,
5400 case SCTP_PRIMARY_ADDR:
5401 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5404 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5407 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5409 case SCTP_ASSOCINFO:
5410 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5412 case SCTP_I_WANT_MAPPED_V4_ADDR:
5413 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5416 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5418 case SCTP_GET_PEER_ADDR_INFO:
5419 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5422 case SCTP_ADAPTATION_LAYER:
5423 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5427 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5429 case SCTP_FRAGMENT_INTERLEAVE:
5430 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5433 case SCTP_PARTIAL_DELIVERY_POINT:
5434 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5437 case SCTP_MAX_BURST:
5438 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5441 case SCTP_AUTH_CHUNK:
5442 case SCTP_AUTH_DELETE_KEY:
5443 retval = -EOPNOTSUPP;
5445 case SCTP_HMAC_IDENT:
5446 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5448 case SCTP_AUTH_ACTIVE_KEY:
5449 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5451 case SCTP_PEER_AUTH_CHUNKS:
5452 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5455 case SCTP_LOCAL_AUTH_CHUNKS:
5456 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5459 case SCTP_GET_ASSOC_NUMBER:
5460 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5462 case SCTP_GET_ASSOC_ID_LIST:
5463 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
5466 retval = -ENOPROTOOPT;
5470 sctp_release_sock(sk);
5474 static void sctp_hash(struct sock *sk)
5479 static void sctp_unhash(struct sock *sk)
5484 /* Check if port is acceptable. Possibly find first available port.
5486 * The port hash table (contained in the 'global' SCTP protocol storage
5487 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5488 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5489 * list (the list number is the port number hashed out, so as you
5490 * would expect from a hash function, all the ports in a given list have
5491 * such a number that hashes out to the same list number; you were
5492 * expecting that, right?); so each list has a set of ports, with a
5493 * link to the socket (struct sock) that uses it, the port number and
5494 * a fastreuse flag (FIXME: NPI ipg).
5496 static struct sctp_bind_bucket *sctp_bucket_create(
5497 struct sctp_bind_hashbucket *head, unsigned short snum);
5499 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5501 struct sctp_bind_hashbucket *head; /* hash list */
5502 struct sctp_bind_bucket *pp; /* hash list port iterator */
5503 struct hlist_node *node;
5504 unsigned short snum;
5507 snum = ntohs(addr->v4.sin_port);
5509 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5510 sctp_local_bh_disable();
5513 /* Search for an available port. */
5514 int low, high, remaining, index;
5517 inet_get_local_port_range(&low, &high);
5518 remaining = (high - low) + 1;
5519 rover = net_random() % remaining + low;
5523 if ((rover < low) || (rover > high))
5525 if (inet_is_reserved_local_port(rover))
5527 index = sctp_phashfn(rover);
5528 head = &sctp_port_hashtable[index];
5529 sctp_spin_lock(&head->lock);
5530 sctp_for_each_hentry(pp, node, &head->chain)
5531 if (pp->port == rover)
5535 sctp_spin_unlock(&head->lock);
5536 } while (--remaining > 0);
5538 /* Exhausted local port range during search? */
5543 /* OK, here is the one we will use. HEAD (the port
5544 * hash table list entry) is non-NULL and we hold it's
5549 /* We are given an specific port number; we verify
5550 * that it is not being used. If it is used, we will
5551 * exahust the search in the hash list corresponding
5552 * to the port number (snum) - we detect that with the
5553 * port iterator, pp being NULL.
5555 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5556 sctp_spin_lock(&head->lock);
5557 sctp_for_each_hentry(pp, node, &head->chain) {
5558 if (pp->port == snum)
5565 if (!hlist_empty(&pp->owner)) {
5566 /* We had a port hash table hit - there is an
5567 * available port (pp != NULL) and it is being
5568 * used by other socket (pp->owner not empty); that other
5569 * socket is going to be sk2.
5571 int reuse = sk->sk_reuse;
5574 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5575 if (pp->fastreuse && sk->sk_reuse &&
5576 sk->sk_state != SCTP_SS_LISTENING)
5579 /* Run through the list of sockets bound to the port
5580 * (pp->port) [via the pointers bind_next and
5581 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5582 * we get the endpoint they describe and run through
5583 * the endpoint's list of IP (v4 or v6) addresses,
5584 * comparing each of the addresses with the address of
5585 * the socket sk. If we find a match, then that means
5586 * that this port/socket (sk) combination are already
5589 sk_for_each_bound(sk2, node, &pp->owner) {
5590 struct sctp_endpoint *ep2;
5591 ep2 = sctp_sk(sk2)->ep;
5594 (reuse && sk2->sk_reuse &&
5595 sk2->sk_state != SCTP_SS_LISTENING))
5598 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5599 sctp_sk(sk2), sctp_sk(sk))) {
5604 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5607 /* If there was a hash table miss, create a new port. */
5609 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5612 /* In either case (hit or miss), make sure fastreuse is 1 only
5613 * if sk->sk_reuse is too (that is, if the caller requested
5614 * SO_REUSEADDR on this socket -sk-).
5616 if (hlist_empty(&pp->owner)) {
5617 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5621 } else if (pp->fastreuse &&
5622 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5625 /* We are set, so fill up all the data in the hash table
5626 * entry, tie the socket list information with the rest of the
5627 * sockets FIXME: Blurry, NPI (ipg).
5630 if (!sctp_sk(sk)->bind_hash) {
5631 inet_sk(sk)->inet_num = snum;
5632 sk_add_bind_node(sk, &pp->owner);
5633 sctp_sk(sk)->bind_hash = pp;
5638 sctp_spin_unlock(&head->lock);
5641 sctp_local_bh_enable();
5645 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5646 * port is requested.
5648 static int sctp_get_port(struct sock *sk, unsigned short snum)
5651 union sctp_addr addr;
5652 struct sctp_af *af = sctp_sk(sk)->pf->af;
5654 /* Set up a dummy address struct from the sk. */
5655 af->from_sk(&addr, sk);
5656 addr.v4.sin_port = htons(snum);
5658 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5659 ret = sctp_get_port_local(sk, &addr);
5665 * Move a socket to LISTENING state.
5667 SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog)
5669 struct sctp_sock *sp = sctp_sk(sk);
5670 struct sctp_endpoint *ep = sp->ep;
5671 struct crypto_hash *tfm = NULL;
5673 /* Allocate HMAC for generating cookie. */
5674 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5675 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5677 if (net_ratelimit()) {
5678 pr_info("failed to load transform for %s: %ld\n",
5679 sctp_hmac_alg, PTR_ERR(tfm));
5683 sctp_sk(sk)->hmac = tfm;
5687 * If a bind() or sctp_bindx() is not called prior to a listen()
5688 * call that allows new associations to be accepted, the system
5689 * picks an ephemeral port and will choose an address set equivalent
5690 * to binding with a wildcard address.
5692 * This is not currently spelled out in the SCTP sockets
5693 * extensions draft, but follows the practice as seen in TCP
5697 sk->sk_state = SCTP_SS_LISTENING;
5698 if (!ep->base.bind_addr.port) {
5699 if (sctp_autobind(sk))
5702 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
5703 sk->sk_state = SCTP_SS_CLOSED;
5708 sk->sk_max_ack_backlog = backlog;
5709 sctp_hash_endpoint(ep);
5714 * 4.1.3 / 5.1.3 listen()
5716 * By default, new associations are not accepted for UDP style sockets.
5717 * An application uses listen() to mark a socket as being able to
5718 * accept new associations.
5720 * On TCP style sockets, applications use listen() to ready the SCTP
5721 * endpoint for accepting inbound associations.
5723 * On both types of endpoints a backlog of '0' disables listening.
5725 * Move a socket to LISTENING state.
5727 int sctp_inet_listen(struct socket *sock, int backlog)
5729 struct sock *sk = sock->sk;
5730 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5733 if (unlikely(backlog < 0))
5738 /* Peeled-off sockets are not allowed to listen(). */
5739 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
5742 if (sock->state != SS_UNCONNECTED)
5745 /* If backlog is zero, disable listening. */
5747 if (sctp_sstate(sk, CLOSED))
5751 sctp_unhash_endpoint(ep);
5752 sk->sk_state = SCTP_SS_CLOSED;
5754 sctp_sk(sk)->bind_hash->fastreuse = 1;
5758 /* If we are already listening, just update the backlog */
5759 if (sctp_sstate(sk, LISTENING))
5760 sk->sk_max_ack_backlog = backlog;
5762 err = sctp_listen_start(sk, backlog);
5769 sctp_release_sock(sk);
5774 * This function is done by modeling the current datagram_poll() and the
5775 * tcp_poll(). Note that, based on these implementations, we don't
5776 * lock the socket in this function, even though it seems that,
5777 * ideally, locking or some other mechanisms can be used to ensure
5778 * the integrity of the counters (sndbuf and wmem_alloc) used
5779 * in this place. We assume that we don't need locks either until proven
5782 * Another thing to note is that we include the Async I/O support
5783 * here, again, by modeling the current TCP/UDP code. We don't have
5784 * a good way to test with it yet.
5786 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
5788 struct sock *sk = sock->sk;
5789 struct sctp_sock *sp = sctp_sk(sk);
5792 poll_wait(file, sk_sleep(sk), wait);
5794 /* A TCP-style listening socket becomes readable when the accept queue
5797 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
5798 return (!list_empty(&sp->ep->asocs)) ?
5799 (POLLIN | POLLRDNORM) : 0;
5803 /* Is there any exceptional events? */
5804 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
5806 if (sk->sk_shutdown & RCV_SHUTDOWN)
5807 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
5808 if (sk->sk_shutdown == SHUTDOWN_MASK)
5811 /* Is it readable? Reconsider this code with TCP-style support. */
5812 if (!skb_queue_empty(&sk->sk_receive_queue))
5813 mask |= POLLIN | POLLRDNORM;
5815 /* The association is either gone or not ready. */
5816 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
5819 /* Is it writable? */
5820 if (sctp_writeable(sk)) {
5821 mask |= POLLOUT | POLLWRNORM;
5823 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
5825 * Since the socket is not locked, the buffer
5826 * might be made available after the writeable check and
5827 * before the bit is set. This could cause a lost I/O
5828 * signal. tcp_poll() has a race breaker for this race
5829 * condition. Based on their implementation, we put
5830 * in the following code to cover it as well.
5832 if (sctp_writeable(sk))
5833 mask |= POLLOUT | POLLWRNORM;
5838 /********************************************************************
5839 * 2nd Level Abstractions
5840 ********************************************************************/
5842 static struct sctp_bind_bucket *sctp_bucket_create(
5843 struct sctp_bind_hashbucket *head, unsigned short snum)
5845 struct sctp_bind_bucket *pp;
5847 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
5849 SCTP_DBG_OBJCNT_INC(bind_bucket);
5852 INIT_HLIST_HEAD(&pp->owner);
5853 hlist_add_head(&pp->node, &head->chain);
5858 /* Caller must hold hashbucket lock for this tb with local BH disabled */
5859 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
5861 if (pp && hlist_empty(&pp->owner)) {
5862 __hlist_del(&pp->node);
5863 kmem_cache_free(sctp_bucket_cachep, pp);
5864 SCTP_DBG_OBJCNT_DEC(bind_bucket);
5868 /* Release this socket's reference to a local port. */
5869 static inline void __sctp_put_port(struct sock *sk)
5871 struct sctp_bind_hashbucket *head =
5872 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)];
5873 struct sctp_bind_bucket *pp;
5875 sctp_spin_lock(&head->lock);
5876 pp = sctp_sk(sk)->bind_hash;
5877 __sk_del_bind_node(sk);
5878 sctp_sk(sk)->bind_hash = NULL;
5879 inet_sk(sk)->inet_num = 0;
5880 sctp_bucket_destroy(pp);
5881 sctp_spin_unlock(&head->lock);
5884 void sctp_put_port(struct sock *sk)
5886 sctp_local_bh_disable();
5887 __sctp_put_port(sk);
5888 sctp_local_bh_enable();
5892 * The system picks an ephemeral port and choose an address set equivalent
5893 * to binding with a wildcard address.
5894 * One of those addresses will be the primary address for the association.
5895 * This automatically enables the multihoming capability of SCTP.
5897 static int sctp_autobind(struct sock *sk)
5899 union sctp_addr autoaddr;
5903 /* Initialize a local sockaddr structure to INADDR_ANY. */
5904 af = sctp_sk(sk)->pf->af;
5906 port = htons(inet_sk(sk)->inet_num);
5907 af->inaddr_any(&autoaddr, port);
5909 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
5912 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
5915 * 4.2 The cmsghdr Structure *
5917 * When ancillary data is sent or received, any number of ancillary data
5918 * objects can be specified by the msg_control and msg_controllen members of
5919 * the msghdr structure, because each object is preceded by
5920 * a cmsghdr structure defining the object's length (the cmsg_len member).
5921 * Historically Berkeley-derived implementations have passed only one object
5922 * at a time, but this API allows multiple objects to be
5923 * passed in a single call to sendmsg() or recvmsg(). The following example
5924 * shows two ancillary data objects in a control buffer.
5926 * |<--------------------------- msg_controllen -------------------------->|
5929 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
5931 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
5934 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
5936 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
5939 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5940 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
5942 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
5944 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
5951 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
5952 sctp_cmsgs_t *cmsgs)
5954 struct cmsghdr *cmsg;
5955 struct msghdr *my_msg = (struct msghdr *)msg;
5957 for (cmsg = CMSG_FIRSTHDR(msg);
5959 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
5960 if (!CMSG_OK(my_msg, cmsg))
5963 /* Should we parse this header or ignore? */
5964 if (cmsg->cmsg_level != IPPROTO_SCTP)
5967 /* Strictly check lengths following example in SCM code. */
5968 switch (cmsg->cmsg_type) {
5970 /* SCTP Socket API Extension
5971 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
5973 * This cmsghdr structure provides information for
5974 * initializing new SCTP associations with sendmsg().
5975 * The SCTP_INITMSG socket option uses this same data
5976 * structure. This structure is not used for
5979 * cmsg_level cmsg_type cmsg_data[]
5980 * ------------ ------------ ----------------------
5981 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
5983 if (cmsg->cmsg_len !=
5984 CMSG_LEN(sizeof(struct sctp_initmsg)))
5986 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
5990 /* SCTP Socket API Extension
5991 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
5993 * This cmsghdr structure specifies SCTP options for
5994 * sendmsg() and describes SCTP header information
5995 * about a received message through recvmsg().
5997 * cmsg_level cmsg_type cmsg_data[]
5998 * ------------ ------------ ----------------------
5999 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6001 if (cmsg->cmsg_len !=
6002 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6006 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6008 /* Minimally, validate the sinfo_flags. */
6009 if (cmsgs->info->sinfo_flags &
6010 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6011 SCTP_ABORT | SCTP_EOF))
6023 * Wait for a packet..
6024 * Note: This function is the same function as in core/datagram.c
6025 * with a few modifications to make lksctp work.
6027 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6032 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6034 /* Socket errors? */
6035 error = sock_error(sk);
6039 if (!skb_queue_empty(&sk->sk_receive_queue))
6042 /* Socket shut down? */
6043 if (sk->sk_shutdown & RCV_SHUTDOWN)
6046 /* Sequenced packets can come disconnected. If so we report the
6051 /* Is there a good reason to think that we may receive some data? */
6052 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6055 /* Handle signals. */
6056 if (signal_pending(current))
6059 /* Let another process have a go. Since we are going to sleep
6060 * anyway. Note: This may cause odd behaviors if the message
6061 * does not fit in the user's buffer, but this seems to be the
6062 * only way to honor MSG_DONTWAIT realistically.
6064 sctp_release_sock(sk);
6065 *timeo_p = schedule_timeout(*timeo_p);
6069 finish_wait(sk_sleep(sk), &wait);
6073 error = sock_intr_errno(*timeo_p);
6076 finish_wait(sk_sleep(sk), &wait);
6081 /* Receive a datagram.
6082 * Note: This is pretty much the same routine as in core/datagram.c
6083 * with a few changes to make lksctp work.
6085 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6086 int noblock, int *err)
6089 struct sk_buff *skb;
6092 timeo = sock_rcvtimeo(sk, noblock);
6094 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6095 timeo, MAX_SCHEDULE_TIMEOUT);
6098 /* Again only user level code calls this function,
6099 * so nothing interrupt level
6100 * will suddenly eat the receive_queue.
6102 * Look at current nfs client by the way...
6103 * However, this function was correct in any case. 8)
6105 if (flags & MSG_PEEK) {
6106 spin_lock_bh(&sk->sk_receive_queue.lock);
6107 skb = skb_peek(&sk->sk_receive_queue);
6109 atomic_inc(&skb->users);
6110 spin_unlock_bh(&sk->sk_receive_queue.lock);
6112 skb = skb_dequeue(&sk->sk_receive_queue);
6118 /* Caller is allowed not to check sk->sk_err before calling. */
6119 error = sock_error(sk);
6123 if (sk->sk_shutdown & RCV_SHUTDOWN)
6126 /* User doesn't want to wait. */
6130 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6139 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6140 static void __sctp_write_space(struct sctp_association *asoc)
6142 struct sock *sk = asoc->base.sk;
6143 struct socket *sock = sk->sk_socket;
6145 if ((sctp_wspace(asoc) > 0) && sock) {
6146 if (waitqueue_active(&asoc->wait))
6147 wake_up_interruptible(&asoc->wait);
6149 if (sctp_writeable(sk)) {
6150 wait_queue_head_t *wq = sk_sleep(sk);
6152 if (wq && waitqueue_active(wq))
6153 wake_up_interruptible(wq);
6155 /* Note that we try to include the Async I/O support
6156 * here by modeling from the current TCP/UDP code.
6157 * We have not tested with it yet.
6159 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
6160 sock_wake_async(sock,
6161 SOCK_WAKE_SPACE, POLL_OUT);
6166 /* Do accounting for the sndbuf space.
6167 * Decrement the used sndbuf space of the corresponding association by the
6168 * data size which was just transmitted(freed).
6170 static void sctp_wfree(struct sk_buff *skb)
6172 struct sctp_association *asoc;
6173 struct sctp_chunk *chunk;
6176 /* Get the saved chunk pointer. */
6177 chunk = *((struct sctp_chunk **)(skb->cb));
6180 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6181 sizeof(struct sk_buff) +
6182 sizeof(struct sctp_chunk);
6184 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6187 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6189 sk->sk_wmem_queued -= skb->truesize;
6190 sk_mem_uncharge(sk, skb->truesize);
6193 __sctp_write_space(asoc);
6195 sctp_association_put(asoc);
6198 /* Do accounting for the receive space on the socket.
6199 * Accounting for the association is done in ulpevent.c
6200 * We set this as a destructor for the cloned data skbs so that
6201 * accounting is done at the correct time.
6203 void sctp_sock_rfree(struct sk_buff *skb)
6205 struct sock *sk = skb->sk;
6206 struct sctp_ulpevent *event = sctp_skb2event(skb);
6208 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6211 * Mimic the behavior of sock_rfree
6213 sk_mem_uncharge(sk, event->rmem_len);
6217 /* Helper function to wait for space in the sndbuf. */
6218 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6221 struct sock *sk = asoc->base.sk;
6223 long current_timeo = *timeo_p;
6226 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6227 asoc, (long)(*timeo_p), msg_len);
6229 /* Increment the association's refcnt. */
6230 sctp_association_hold(asoc);
6232 /* Wait on the association specific sndbuf space. */
6234 prepare_to_wait_exclusive(&asoc->wait, &wait,
6235 TASK_INTERRUPTIBLE);
6238 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6241 if (signal_pending(current))
6242 goto do_interrupted;
6243 if (msg_len <= sctp_wspace(asoc))
6246 /* Let another process have a go. Since we are going
6249 sctp_release_sock(sk);
6250 current_timeo = schedule_timeout(current_timeo);
6251 BUG_ON(sk != asoc->base.sk);
6254 *timeo_p = current_timeo;
6258 finish_wait(&asoc->wait, &wait);
6260 /* Release the association's refcnt. */
6261 sctp_association_put(asoc);
6270 err = sock_intr_errno(*timeo_p);
6278 void sctp_data_ready(struct sock *sk, int len)
6280 struct socket_wq *wq;
6283 wq = rcu_dereference(sk->sk_wq);
6284 if (wq_has_sleeper(wq))
6285 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
6286 POLLRDNORM | POLLRDBAND);
6287 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
6291 /* If socket sndbuf has changed, wake up all per association waiters. */
6292 void sctp_write_space(struct sock *sk)
6294 struct sctp_association *asoc;
6296 /* Wake up the tasks in each wait queue. */
6297 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6298 __sctp_write_space(asoc);
6302 /* Is there any sndbuf space available on the socket?
6304 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6305 * associations on the same socket. For a UDP-style socket with
6306 * multiple associations, it is possible for it to be "unwriteable"
6307 * prematurely. I assume that this is acceptable because
6308 * a premature "unwriteable" is better than an accidental "writeable" which
6309 * would cause an unwanted block under certain circumstances. For the 1-1
6310 * UDP-style sockets or TCP-style sockets, this code should work.
6313 static int sctp_writeable(struct sock *sk)
6317 amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
6323 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6324 * returns immediately with EINPROGRESS.
6326 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6328 struct sock *sk = asoc->base.sk;
6330 long current_timeo = *timeo_p;
6333 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6336 /* Increment the association's refcnt. */
6337 sctp_association_hold(asoc);
6340 prepare_to_wait_exclusive(&asoc->wait, &wait,
6341 TASK_INTERRUPTIBLE);
6344 if (sk->sk_shutdown & RCV_SHUTDOWN)
6346 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6349 if (signal_pending(current))
6350 goto do_interrupted;
6352 if (sctp_state(asoc, ESTABLISHED))
6355 /* Let another process have a go. Since we are going
6358 sctp_release_sock(sk);
6359 current_timeo = schedule_timeout(current_timeo);
6362 *timeo_p = current_timeo;
6366 finish_wait(&asoc->wait, &wait);
6368 /* Release the association's refcnt. */
6369 sctp_association_put(asoc);
6374 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6377 err = -ECONNREFUSED;
6381 err = sock_intr_errno(*timeo_p);
6389 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6391 struct sctp_endpoint *ep;
6395 ep = sctp_sk(sk)->ep;
6399 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
6400 TASK_INTERRUPTIBLE);
6402 if (list_empty(&ep->asocs)) {
6403 sctp_release_sock(sk);
6404 timeo = schedule_timeout(timeo);
6409 if (!sctp_sstate(sk, LISTENING))
6413 if (!list_empty(&ep->asocs))
6416 err = sock_intr_errno(timeo);
6417 if (signal_pending(current))
6425 finish_wait(sk_sleep(sk), &wait);
6430 static void sctp_wait_for_close(struct sock *sk, long timeout)
6435 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
6436 if (list_empty(&sctp_sk(sk)->ep->asocs))
6438 sctp_release_sock(sk);
6439 timeout = schedule_timeout(timeout);
6441 } while (!signal_pending(current) && timeout);
6443 finish_wait(sk_sleep(sk), &wait);
6446 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6448 struct sk_buff *frag;
6453 /* Don't forget the fragments. */
6454 skb_walk_frags(skb, frag)
6455 sctp_skb_set_owner_r_frag(frag, sk);
6458 sctp_skb_set_owner_r(skb, sk);
6461 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
6462 struct sctp_association *asoc)
6464 struct inet_sock *inet = inet_sk(sk);
6465 struct inet_sock *newinet;
6467 newsk->sk_type = sk->sk_type;
6468 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
6469 newsk->sk_flags = sk->sk_flags;
6470 newsk->sk_no_check = sk->sk_no_check;
6471 newsk->sk_reuse = sk->sk_reuse;
6473 newsk->sk_shutdown = sk->sk_shutdown;
6474 newsk->sk_destruct = inet_sock_destruct;
6475 newsk->sk_family = sk->sk_family;
6476 newsk->sk_protocol = IPPROTO_SCTP;
6477 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
6478 newsk->sk_sndbuf = sk->sk_sndbuf;
6479 newsk->sk_rcvbuf = sk->sk_rcvbuf;
6480 newsk->sk_lingertime = sk->sk_lingertime;
6481 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
6482 newsk->sk_sndtimeo = sk->sk_sndtimeo;
6484 newinet = inet_sk(newsk);
6486 /* Initialize sk's sport, dport, rcv_saddr and daddr for
6487 * getsockname() and getpeername()
6489 newinet->inet_sport = inet->inet_sport;
6490 newinet->inet_saddr = inet->inet_saddr;
6491 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
6492 newinet->inet_dport = htons(asoc->peer.port);
6493 newinet->pmtudisc = inet->pmtudisc;
6494 newinet->inet_id = asoc->next_tsn ^ jiffies;
6496 newinet->uc_ttl = inet->uc_ttl;
6497 newinet->mc_loop = 1;
6498 newinet->mc_ttl = 1;
6499 newinet->mc_index = 0;
6500 newinet->mc_list = NULL;
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)->inet_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)->inet_num = inet_sk(oldsk)->inet_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 __skb_unlink(skb, &oldsk->sk_receive_queue);
6556 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6557 sctp_skb_set_owner_r_frag(skb, newsk);
6561 /* Clean up any messages pending delivery due to partial
6562 * delivery. Three cases:
6563 * 1) No partial deliver; no work.
6564 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6565 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6567 skb_queue_head_init(&newsp->pd_lobby);
6568 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6570 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6571 struct sk_buff_head *queue;
6573 /* Decide which queue to move pd_lobby skbs to. */
6574 if (assoc->ulpq.pd_mode) {
6575 queue = &newsp->pd_lobby;
6577 queue = &newsk->sk_receive_queue;
6579 /* Walk through the pd_lobby, looking for skbs that
6580 * need moved to the new socket.
6582 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6583 event = sctp_skb2event(skb);
6584 if (event->asoc == assoc) {
6585 __skb_unlink(skb, &oldsp->pd_lobby);
6586 __skb_queue_tail(queue, skb);
6587 sctp_skb_set_owner_r_frag(skb, newsk);
6591 /* Clear up any skbs waiting for the partial
6592 * delivery to finish.
6594 if (assoc->ulpq.pd_mode)
6595 sctp_clear_pd(oldsk, NULL);
6599 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp)
6600 sctp_skb_set_owner_r_frag(skb, newsk);
6602 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp)
6603 sctp_skb_set_owner_r_frag(skb, newsk);
6605 /* Set the type of socket to indicate that it is peeled off from the
6606 * original UDP-style socket or created with the accept() call on a
6607 * TCP-style socket..
6611 /* Mark the new socket "in-use" by the user so that any packets
6612 * that may arrive on the association after we've moved it are
6613 * queued to the backlog. This prevents a potential race between
6614 * backlog processing on the old socket and new-packet processing
6615 * on the new socket.
6617 * The caller has just allocated newsk so we can guarantee that other
6618 * paths won't try to lock it and then oldsk.
6620 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6621 sctp_assoc_migrate(assoc, newsk);
6623 /* If the association on the newsk is already closed before accept()
6624 * is called, set RCV_SHUTDOWN flag.
6626 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6627 newsk->sk_shutdown |= RCV_SHUTDOWN;
6629 newsk->sk_state = SCTP_SS_ESTABLISHED;
6630 sctp_release_sock(newsk);
6634 /* This proto struct describes the ULP interface for SCTP. */
6635 struct proto sctp_prot = {
6637 .owner = THIS_MODULE,
6638 .close = sctp_close,
6639 .connect = sctp_connect,
6640 .disconnect = sctp_disconnect,
6641 .accept = sctp_accept,
6642 .ioctl = sctp_ioctl,
6643 .init = sctp_init_sock,
6644 .destroy = sctp_destroy_sock,
6645 .shutdown = sctp_shutdown,
6646 .setsockopt = sctp_setsockopt,
6647 .getsockopt = sctp_getsockopt,
6648 .sendmsg = sctp_sendmsg,
6649 .recvmsg = sctp_recvmsg,
6651 .backlog_rcv = sctp_backlog_rcv,
6653 .unhash = sctp_unhash,
6654 .get_port = sctp_get_port,
6655 .obj_size = sizeof(struct sctp_sock),
6656 .sysctl_mem = sysctl_sctp_mem,
6657 .sysctl_rmem = sysctl_sctp_rmem,
6658 .sysctl_wmem = sysctl_sctp_wmem,
6659 .memory_pressure = &sctp_memory_pressure,
6660 .enter_memory_pressure = sctp_enter_memory_pressure,
6661 .memory_allocated = &sctp_memory_allocated,
6662 .sockets_allocated = &sctp_sockets_allocated,
6665 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6667 struct proto sctpv6_prot = {
6669 .owner = THIS_MODULE,
6670 .close = sctp_close,
6671 .connect = sctp_connect,
6672 .disconnect = sctp_disconnect,
6673 .accept = sctp_accept,
6674 .ioctl = sctp_ioctl,
6675 .init = sctp_init_sock,
6676 .destroy = sctp_destroy_sock,
6677 .shutdown = sctp_shutdown,
6678 .setsockopt = sctp_setsockopt,
6679 .getsockopt = sctp_getsockopt,
6680 .sendmsg = sctp_sendmsg,
6681 .recvmsg = sctp_recvmsg,
6683 .backlog_rcv = sctp_backlog_rcv,
6685 .unhash = sctp_unhash,
6686 .get_port = sctp_get_port,
6687 .obj_size = sizeof(struct sctp6_sock),
6688 .sysctl_mem = sysctl_sctp_mem,
6689 .sysctl_rmem = sysctl_sctp_rmem,
6690 .sysctl_wmem = sysctl_sctp_wmem,
6691 .memory_pressure = &sctp_memory_pressure,
6692 .enter_memory_pressure = sctp_enter_memory_pressure,
6693 .memory_allocated = &sctp_memory_allocated,
6694 .sockets_allocated = &sctp_sockets_allocated,
6696 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */