x86: smp.h move cpu_initialized_mask and cpu_initialized declartion to cpumask.h
[linux-2.6/x86.git] / net / sctp / socket.c
blobff0a8f88de04bd275f3b16b921ed88d846407ca4
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)
22 * any later version.
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
36 * email address(es):
37 * lksctp developers <lksctp-developers@lists.sourceforge.net>
39 * Or submit a bug report through the following website:
40 * http://www.sf.net/projects/lksctp
42 * Written or modified by:
43 * La Monte H.P. Yarroll <piggy@acm.org>
44 * Narasimha Budihal <narsi@refcode.org>
45 * Karl Knutson <karl@athena.chicago.il.us>
46 * Jon Grimm <jgrimm@us.ibm.com>
47 * Xingang Guo <xingang.guo@intel.com>
48 * Daisy Chang <daisyc@us.ibm.com>
49 * Sridhar Samudrala <samudrala@us.ibm.com>
50 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
51 * Ardelle Fan <ardelle.fan@intel.com>
52 * Ryan Layer <rmlayer@us.ibm.com>
53 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
54 * Kevin Gao <kevin.gao@intel.com>
56 * Any bugs reported given to us we will try to fix... any fixes shared will
57 * be incorporated into the next SCTP release.
60 #include <linux/types.h>
61 #include <linux/kernel.h>
62 #include <linux/wait.h>
63 #include <linux/time.h>
64 #include <linux/ip.h>
65 #include <linux/capability.h>
66 #include <linux/fcntl.h>
67 #include <linux/poll.h>
68 #include <linux/init.h>
69 #include <linux/crypto.h>
71 #include <net/ip.h>
72 #include <net/icmp.h>
73 #include <net/route.h>
74 #include <net/ipv6.h>
75 #include <net/inet_common.h>
77 #include <linux/socket.h> /* for sa_family_t */
78 #include <net/sock.h>
79 #include <net/sctp/sctp.h>
80 #include <net/sctp/sm.h>
82 /* WARNING: Please do not remove the SCTP_STATIC attribute to
83 * any of the functions below as they are used to export functions
84 * used by a project regression testsuite.
87 /* Forward declarations for internal helper functions. */
88 static int sctp_writeable(struct sock *sk);
89 static void sctp_wfree(struct sk_buff *skb);
90 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
91 size_t msg_len);
92 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
93 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
94 static int sctp_wait_for_accept(struct sock *sk, long timeo);
95 static void sctp_wait_for_close(struct sock *sk, long timeo);
96 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
97 union sctp_addr *addr, int len);
98 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
99 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
102 static int sctp_send_asconf(struct sctp_association *asoc,
103 struct sctp_chunk *chunk);
104 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
105 static int sctp_autobind(struct sock *sk);
106 static void sctp_sock_migrate(struct sock *, struct sock *,
107 struct sctp_association *, sctp_socket_type_t);
108 static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
110 extern struct kmem_cache *sctp_bucket_cachep;
111 extern int sysctl_sctp_mem[3];
112 extern int sysctl_sctp_rmem[3];
113 extern int sysctl_sctp_wmem[3];
115 static int sctp_memory_pressure;
116 static atomic_t sctp_memory_allocated;
117 struct percpu_counter sctp_sockets_allocated;
119 static void sctp_enter_memory_pressure(struct sock *sk)
121 sctp_memory_pressure = 1;
125 /* Get the sndbuf space available at the time on the association. */
126 static inline int sctp_wspace(struct sctp_association *asoc)
128 int amt;
130 if (asoc->ep->sndbuf_policy)
131 amt = asoc->sndbuf_used;
132 else
133 amt = atomic_read(&asoc->base.sk->sk_wmem_alloc);
135 if (amt >= asoc->base.sk->sk_sndbuf) {
136 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
137 amt = 0;
138 else {
139 amt = sk_stream_wspace(asoc->base.sk);
140 if (amt < 0)
141 amt = 0;
143 } else {
144 amt = asoc->base.sk->sk_sndbuf - amt;
146 return amt;
149 /* Increment the used sndbuf space count of the corresponding association by
150 * the size of the outgoing data chunk.
151 * Also, set the skb destructor for sndbuf accounting later.
153 * Since it is always 1-1 between chunk and skb, and also a new skb is always
154 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
155 * destructor in the data chunk skb for the purpose of the sndbuf space
156 * tracking.
158 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
160 struct sctp_association *asoc = chunk->asoc;
161 struct sock *sk = asoc->base.sk;
163 /* The sndbuf space is tracked per association. */
164 sctp_association_hold(asoc);
166 skb_set_owner_w(chunk->skb, sk);
168 chunk->skb->destructor = sctp_wfree;
169 /* Save the chunk pointer in skb for sctp_wfree to use later. */
170 *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
172 asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
173 sizeof(struct sk_buff) +
174 sizeof(struct sctp_chunk);
176 atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
177 sk->sk_wmem_queued += chunk->skb->truesize;
178 sk_mem_charge(sk, chunk->skb->truesize);
181 /* Verify that this is a valid address. */
182 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
183 int len)
185 struct sctp_af *af;
187 /* Verify basic sockaddr. */
188 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
189 if (!af)
190 return -EINVAL;
192 /* Is this a valid SCTP address? */
193 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
194 return -EINVAL;
196 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
197 return -EINVAL;
199 return 0;
202 /* Look up the association by its id. If this is not a UDP-style
203 * socket, the ID field is always ignored.
205 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
207 struct sctp_association *asoc = NULL;
209 /* If this is not a UDP-style socket, assoc id should be ignored. */
210 if (!sctp_style(sk, UDP)) {
211 /* Return NULL if the socket state is not ESTABLISHED. It
212 * could be a TCP-style listening socket or a socket which
213 * hasn't yet called connect() to establish an association.
215 if (!sctp_sstate(sk, ESTABLISHED))
216 return NULL;
218 /* Get the first and the only association from the list. */
219 if (!list_empty(&sctp_sk(sk)->ep->asocs))
220 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
221 struct sctp_association, asocs);
222 return asoc;
225 /* Otherwise this is a UDP-style socket. */
226 if (!id || (id == (sctp_assoc_t)-1))
227 return NULL;
229 spin_lock_bh(&sctp_assocs_id_lock);
230 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
231 spin_unlock_bh(&sctp_assocs_id_lock);
233 if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
234 return NULL;
236 return asoc;
239 /* Look up the transport from an address and an assoc id. If both address and
240 * id are specified, the associations matching the address and the id should be
241 * the same.
243 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
244 struct sockaddr_storage *addr,
245 sctp_assoc_t id)
247 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
248 struct sctp_transport *transport;
249 union sctp_addr *laddr = (union sctp_addr *)addr;
251 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
252 laddr,
253 &transport);
255 if (!addr_asoc)
256 return NULL;
258 id_asoc = sctp_id2assoc(sk, id);
259 if (id_asoc && (id_asoc != addr_asoc))
260 return NULL;
262 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
263 (union sctp_addr *)addr);
265 return transport;
268 /* API 3.1.2 bind() - UDP Style Syntax
269 * The syntax of bind() is,
271 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
273 * sd - the socket descriptor returned by socket().
274 * addr - the address structure (struct sockaddr_in or struct
275 * sockaddr_in6 [RFC 2553]),
276 * addr_len - the size of the address structure.
278 SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
280 int retval = 0;
282 sctp_lock_sock(sk);
284 SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
285 sk, addr, addr_len);
287 /* Disallow binding twice. */
288 if (!sctp_sk(sk)->ep->base.bind_addr.port)
289 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
290 addr_len);
291 else
292 retval = -EINVAL;
294 sctp_release_sock(sk);
296 return retval;
299 static long sctp_get_port_local(struct sock *, union sctp_addr *);
301 /* Verify this is a valid sockaddr. */
302 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
303 union sctp_addr *addr, int len)
305 struct sctp_af *af;
307 /* Check minimum size. */
308 if (len < sizeof (struct sockaddr))
309 return NULL;
311 /* V4 mapped address are really of AF_INET family */
312 if (addr->sa.sa_family == AF_INET6 &&
313 ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
314 if (!opt->pf->af_supported(AF_INET, opt))
315 return NULL;
316 } else {
317 /* Does this PF support this AF? */
318 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
319 return NULL;
322 /* If we get this far, af is valid. */
323 af = sctp_get_af_specific(addr->sa.sa_family);
325 if (len < af->sockaddr_len)
326 return NULL;
328 return af;
331 /* Bind a local address either to an endpoint or to an association. */
332 SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
334 struct sctp_sock *sp = sctp_sk(sk);
335 struct sctp_endpoint *ep = sp->ep;
336 struct sctp_bind_addr *bp = &ep->base.bind_addr;
337 struct sctp_af *af;
338 unsigned short snum;
339 int ret = 0;
341 /* Common sockaddr verification. */
342 af = sctp_sockaddr_af(sp, addr, len);
343 if (!af) {
344 SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
345 sk, addr, len);
346 return -EINVAL;
349 snum = ntohs(addr->v4.sin_port);
351 SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
352 ", port: %d, new port: %d, len: %d)\n",
354 addr,
355 bp->port, snum,
356 len);
358 /* PF specific bind() address verification. */
359 if (!sp->pf->bind_verify(sp, addr))
360 return -EADDRNOTAVAIL;
362 /* We must either be unbound, or bind to the same port.
363 * It's OK to allow 0 ports if we are already bound.
364 * We'll just inhert an already bound port in this case
366 if (bp->port) {
367 if (!snum)
368 snum = bp->port;
369 else if (snum != bp->port) {
370 SCTP_DEBUG_PRINTK("sctp_do_bind:"
371 " New port %d does not match existing port "
372 "%d.\n", snum, bp->port);
373 return -EINVAL;
377 if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
378 return -EACCES;
380 /* See if the address matches any of the addresses we may have
381 * already bound before checking against other endpoints.
383 if (sctp_bind_addr_match(bp, addr, sp))
384 return -EINVAL;
386 /* Make sure we are allowed to bind here.
387 * The function sctp_get_port_local() does duplicate address
388 * detection.
390 addr->v4.sin_port = htons(snum);
391 if ((ret = sctp_get_port_local(sk, addr))) {
392 return -EADDRINUSE;
395 /* Refresh ephemeral port. */
396 if (!bp->port)
397 bp->port = inet_sk(sk)->num;
399 /* Add the address to the bind address list.
400 * Use GFP_ATOMIC since BHs will be disabled.
402 ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
404 /* Copy back into socket for getsockname() use. */
405 if (!ret) {
406 inet_sk(sk)->sport = htons(inet_sk(sk)->num);
407 af->to_sk_saddr(addr, sk);
410 return ret;
413 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
415 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
416 * at any one time. If a sender, after sending an ASCONF chunk, decides
417 * it needs to transfer another ASCONF Chunk, it MUST wait until the
418 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
419 * subsequent ASCONF. Note this restriction binds each side, so at any
420 * time two ASCONF may be in-transit on any given association (one sent
421 * from each endpoint).
423 static int sctp_send_asconf(struct sctp_association *asoc,
424 struct sctp_chunk *chunk)
426 int retval = 0;
428 /* If there is an outstanding ASCONF chunk, queue it for later
429 * transmission.
431 if (asoc->addip_last_asconf) {
432 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
433 goto out;
436 /* Hold the chunk until an ASCONF_ACK is received. */
437 sctp_chunk_hold(chunk);
438 retval = sctp_primitive_ASCONF(asoc, chunk);
439 if (retval)
440 sctp_chunk_free(chunk);
441 else
442 asoc->addip_last_asconf = chunk;
444 out:
445 return retval;
448 /* Add a list of addresses as bind addresses to local endpoint or
449 * association.
451 * Basically run through each address specified in the addrs/addrcnt
452 * array/length pair, determine if it is IPv6 or IPv4 and call
453 * sctp_do_bind() on it.
455 * If any of them fails, then the operation will be reversed and the
456 * ones that were added will be removed.
458 * Only sctp_setsockopt_bindx() is supposed to call this function.
460 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
462 int cnt;
463 int retval = 0;
464 void *addr_buf;
465 struct sockaddr *sa_addr;
466 struct sctp_af *af;
468 SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
469 sk, addrs, addrcnt);
471 addr_buf = addrs;
472 for (cnt = 0; cnt < addrcnt; cnt++) {
473 /* The list may contain either IPv4 or IPv6 address;
474 * determine the address length for walking thru the list.
476 sa_addr = (struct sockaddr *)addr_buf;
477 af = sctp_get_af_specific(sa_addr->sa_family);
478 if (!af) {
479 retval = -EINVAL;
480 goto err_bindx_add;
483 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
484 af->sockaddr_len);
486 addr_buf += af->sockaddr_len;
488 err_bindx_add:
489 if (retval < 0) {
490 /* Failed. Cleanup the ones that have been added */
491 if (cnt > 0)
492 sctp_bindx_rem(sk, addrs, cnt);
493 return retval;
497 return retval;
500 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
501 * associations that are part of the endpoint indicating that a list of local
502 * addresses are added to the endpoint.
504 * If any of the addresses is already in the bind address list of the
505 * association, we do not send the chunk for that association. But it will not
506 * affect other associations.
508 * Only sctp_setsockopt_bindx() is supposed to call this function.
510 static int sctp_send_asconf_add_ip(struct sock *sk,
511 struct sockaddr *addrs,
512 int addrcnt)
514 struct sctp_sock *sp;
515 struct sctp_endpoint *ep;
516 struct sctp_association *asoc;
517 struct sctp_bind_addr *bp;
518 struct sctp_chunk *chunk;
519 struct sctp_sockaddr_entry *laddr;
520 union sctp_addr *addr;
521 union sctp_addr saveaddr;
522 void *addr_buf;
523 struct sctp_af *af;
524 struct list_head *p;
525 int i;
526 int retval = 0;
528 if (!sctp_addip_enable)
529 return retval;
531 sp = sctp_sk(sk);
532 ep = sp->ep;
534 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
535 __func__, sk, addrs, addrcnt);
537 list_for_each_entry(asoc, &ep->asocs, asocs) {
539 if (!asoc->peer.asconf_capable)
540 continue;
542 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
543 continue;
545 if (!sctp_state(asoc, ESTABLISHED))
546 continue;
548 /* Check if any address in the packed array of addresses is
549 * in the bind address list of the association. If so,
550 * do not send the asconf chunk to its peer, but continue with
551 * other associations.
553 addr_buf = addrs;
554 for (i = 0; i < addrcnt; i++) {
555 addr = (union sctp_addr *)addr_buf;
556 af = sctp_get_af_specific(addr->v4.sin_family);
557 if (!af) {
558 retval = -EINVAL;
559 goto out;
562 if (sctp_assoc_lookup_laddr(asoc, addr))
563 break;
565 addr_buf += af->sockaddr_len;
567 if (i < addrcnt)
568 continue;
570 /* Use the first valid address in bind addr list of
571 * association as Address Parameter of ASCONF CHUNK.
573 bp = &asoc->base.bind_addr;
574 p = bp->address_list.next;
575 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
576 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
577 addrcnt, SCTP_PARAM_ADD_IP);
578 if (!chunk) {
579 retval = -ENOMEM;
580 goto out;
583 retval = sctp_send_asconf(asoc, chunk);
584 if (retval)
585 goto out;
587 /* Add the new addresses to the bind address list with
588 * use_as_src set to 0.
590 addr_buf = addrs;
591 for (i = 0; i < addrcnt; i++) {
592 addr = (union sctp_addr *)addr_buf;
593 af = sctp_get_af_specific(addr->v4.sin_family);
594 memcpy(&saveaddr, addr, af->sockaddr_len);
595 retval = sctp_add_bind_addr(bp, &saveaddr,
596 SCTP_ADDR_NEW, GFP_ATOMIC);
597 addr_buf += af->sockaddr_len;
601 out:
602 return retval;
605 /* Remove a list of addresses from bind addresses list. Do not remove the
606 * last address.
608 * Basically run through each address specified in the addrs/addrcnt
609 * array/length pair, determine if it is IPv6 or IPv4 and call
610 * sctp_del_bind() on it.
612 * If any of them fails, then the operation will be reversed and the
613 * ones that were removed will be added back.
615 * At least one address has to be left; if only one address is
616 * available, the operation will return -EBUSY.
618 * Only sctp_setsockopt_bindx() is supposed to call this function.
620 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
622 struct sctp_sock *sp = sctp_sk(sk);
623 struct sctp_endpoint *ep = sp->ep;
624 int cnt;
625 struct sctp_bind_addr *bp = &ep->base.bind_addr;
626 int retval = 0;
627 void *addr_buf;
628 union sctp_addr *sa_addr;
629 struct sctp_af *af;
631 SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
632 sk, addrs, addrcnt);
634 addr_buf = addrs;
635 for (cnt = 0; cnt < addrcnt; cnt++) {
636 /* If the bind address list is empty or if there is only one
637 * bind address, there is nothing more to be removed (we need
638 * at least one address here).
640 if (list_empty(&bp->address_list) ||
641 (sctp_list_single_entry(&bp->address_list))) {
642 retval = -EBUSY;
643 goto err_bindx_rem;
646 sa_addr = (union sctp_addr *)addr_buf;
647 af = sctp_get_af_specific(sa_addr->sa.sa_family);
648 if (!af) {
649 retval = -EINVAL;
650 goto err_bindx_rem;
653 if (!af->addr_valid(sa_addr, sp, NULL)) {
654 retval = -EADDRNOTAVAIL;
655 goto err_bindx_rem;
658 if (sa_addr->v4.sin_port != htons(bp->port)) {
659 retval = -EINVAL;
660 goto err_bindx_rem;
663 /* FIXME - There is probably a need to check if sk->sk_saddr and
664 * sk->sk_rcv_addr are currently set to one of the addresses to
665 * be removed. This is something which needs to be looked into
666 * when we are fixing the outstanding issues with multi-homing
667 * socket routing and failover schemes. Refer to comments in
668 * sctp_do_bind(). -daisy
670 retval = sctp_del_bind_addr(bp, sa_addr);
672 addr_buf += af->sockaddr_len;
673 err_bindx_rem:
674 if (retval < 0) {
675 /* Failed. Add the ones that has been removed back */
676 if (cnt > 0)
677 sctp_bindx_add(sk, addrs, cnt);
678 return retval;
682 return retval;
685 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
686 * the associations that are part of the endpoint indicating that a list of
687 * local addresses are removed from the endpoint.
689 * If any of the addresses is already in the bind address list of the
690 * association, we do not send the chunk for that association. But it will not
691 * affect other associations.
693 * Only sctp_setsockopt_bindx() is supposed to call this function.
695 static int sctp_send_asconf_del_ip(struct sock *sk,
696 struct sockaddr *addrs,
697 int addrcnt)
699 struct sctp_sock *sp;
700 struct sctp_endpoint *ep;
701 struct sctp_association *asoc;
702 struct sctp_transport *transport;
703 struct sctp_bind_addr *bp;
704 struct sctp_chunk *chunk;
705 union sctp_addr *laddr;
706 void *addr_buf;
707 struct sctp_af *af;
708 struct sctp_sockaddr_entry *saddr;
709 int i;
710 int retval = 0;
712 if (!sctp_addip_enable)
713 return retval;
715 sp = sctp_sk(sk);
716 ep = sp->ep;
718 SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
719 __func__, sk, addrs, addrcnt);
721 list_for_each_entry(asoc, &ep->asocs, asocs) {
723 if (!asoc->peer.asconf_capable)
724 continue;
726 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
727 continue;
729 if (!sctp_state(asoc, ESTABLISHED))
730 continue;
732 /* Check if any address in the packed array of addresses is
733 * not present in the bind address list of the association.
734 * If so, do not send the asconf chunk to its peer, but
735 * continue with other associations.
737 addr_buf = addrs;
738 for (i = 0; i < addrcnt; i++) {
739 laddr = (union sctp_addr *)addr_buf;
740 af = sctp_get_af_specific(laddr->v4.sin_family);
741 if (!af) {
742 retval = -EINVAL;
743 goto out;
746 if (!sctp_assoc_lookup_laddr(asoc, laddr))
747 break;
749 addr_buf += af->sockaddr_len;
751 if (i < addrcnt)
752 continue;
754 /* Find one address in the association's bind address list
755 * that is not in the packed array of addresses. This is to
756 * make sure that we do not delete all the addresses in the
757 * association.
759 bp = &asoc->base.bind_addr;
760 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
761 addrcnt, sp);
762 if (!laddr)
763 continue;
765 /* We do not need RCU protection throughout this loop
766 * because this is done under a socket lock from the
767 * setsockopt call.
769 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
770 SCTP_PARAM_DEL_IP);
771 if (!chunk) {
772 retval = -ENOMEM;
773 goto out;
776 /* Reset use_as_src flag for the addresses in the bind address
777 * list that are to be deleted.
779 addr_buf = addrs;
780 for (i = 0; i < addrcnt; i++) {
781 laddr = (union sctp_addr *)addr_buf;
782 af = sctp_get_af_specific(laddr->v4.sin_family);
783 list_for_each_entry(saddr, &bp->address_list, list) {
784 if (sctp_cmp_addr_exact(&saddr->a, laddr))
785 saddr->state = SCTP_ADDR_DEL;
787 addr_buf += af->sockaddr_len;
790 /* Update the route and saddr entries for all the transports
791 * as some of the addresses in the bind address list are
792 * about to be deleted and cannot be used as source addresses.
794 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
795 transports) {
796 dst_release(transport->dst);
797 sctp_transport_route(transport, NULL,
798 sctp_sk(asoc->base.sk));
801 retval = sctp_send_asconf(asoc, chunk);
803 out:
804 return retval;
807 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
809 * API 8.1
810 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
811 * int flags);
813 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
814 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
815 * or IPv6 addresses.
817 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
818 * Section 3.1.2 for this usage.
820 * addrs is a pointer to an array of one or more socket addresses. Each
821 * address is contained in its appropriate structure (i.e. struct
822 * sockaddr_in or struct sockaddr_in6) the family of the address type
823 * must be used to distinguish the address length (note that this
824 * representation is termed a "packed array" of addresses). The caller
825 * specifies the number of addresses in the array with addrcnt.
827 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
828 * -1, and sets errno to the appropriate error code.
830 * For SCTP, the port given in each socket address must be the same, or
831 * sctp_bindx() will fail, setting errno to EINVAL.
833 * The flags parameter is formed from the bitwise OR of zero or more of
834 * the following currently defined flags:
836 * SCTP_BINDX_ADD_ADDR
838 * SCTP_BINDX_REM_ADDR
840 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
841 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
842 * addresses from the association. The two flags are mutually exclusive;
843 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
844 * not remove all addresses from an association; sctp_bindx() will
845 * reject such an attempt with EINVAL.
847 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
848 * additional addresses with an endpoint after calling bind(). Or use
849 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
850 * socket is associated with so that no new association accepted will be
851 * associated with those addresses. If the endpoint supports dynamic
852 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
853 * endpoint to send the appropriate message to the peer to change the
854 * peers address lists.
856 * Adding and removing addresses from a connected association is
857 * optional functionality. Implementations that do not support this
858 * functionality should return EOPNOTSUPP.
860 * Basically do nothing but copying the addresses from user to kernel
861 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
862 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
863 * from userspace.
865 * We don't use copy_from_user() for optimization: we first do the
866 * sanity checks (buffer size -fast- and access check-healthy
867 * pointer); if all of those succeed, then we can alloc the memory
868 * (expensive operation) needed to copy the data to kernel. Then we do
869 * the copying without checking the user space area
870 * (__copy_from_user()).
872 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
873 * it.
875 * sk The sk of the socket
876 * addrs The pointer to the addresses in user land
877 * addrssize Size of the addrs buffer
878 * op Operation to perform (add or remove, see the flags of
879 * sctp_bindx)
881 * Returns 0 if ok, <0 errno code on error.
883 SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
884 struct sockaddr __user *addrs,
885 int addrs_size, int op)
887 struct sockaddr *kaddrs;
888 int err;
889 int addrcnt = 0;
890 int walk_size = 0;
891 struct sockaddr *sa_addr;
892 void *addr_buf;
893 struct sctp_af *af;
895 SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p"
896 " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
898 if (unlikely(addrs_size <= 0))
899 return -EINVAL;
901 /* Check the user passed a healthy pointer. */
902 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
903 return -EFAULT;
905 /* Alloc space for the address array in kernel memory. */
906 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
907 if (unlikely(!kaddrs))
908 return -ENOMEM;
910 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
911 kfree(kaddrs);
912 return -EFAULT;
915 /* Walk through the addrs buffer and count the number of addresses. */
916 addr_buf = kaddrs;
917 while (walk_size < addrs_size) {
918 sa_addr = (struct sockaddr *)addr_buf;
919 af = sctp_get_af_specific(sa_addr->sa_family);
921 /* If the address family is not supported or if this address
922 * causes the address buffer to overflow return EINVAL.
924 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
925 kfree(kaddrs);
926 return -EINVAL;
928 addrcnt++;
929 addr_buf += af->sockaddr_len;
930 walk_size += af->sockaddr_len;
933 /* Do the work. */
934 switch (op) {
935 case SCTP_BINDX_ADD_ADDR:
936 err = sctp_bindx_add(sk, kaddrs, addrcnt);
937 if (err)
938 goto out;
939 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
940 break;
942 case SCTP_BINDX_REM_ADDR:
943 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
944 if (err)
945 goto out;
946 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
947 break;
949 default:
950 err = -EINVAL;
951 break;
954 out:
955 kfree(kaddrs);
957 return err;
960 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
962 * Common routine for handling connect() and sctp_connectx().
963 * Connect will come in with just a single address.
965 static int __sctp_connect(struct sock* sk,
966 struct sockaddr *kaddrs,
967 int addrs_size,
968 sctp_assoc_t *assoc_id)
970 struct sctp_sock *sp;
971 struct sctp_endpoint *ep;
972 struct sctp_association *asoc = NULL;
973 struct sctp_association *asoc2;
974 struct sctp_transport *transport;
975 union sctp_addr to;
976 struct sctp_af *af;
977 sctp_scope_t scope;
978 long timeo;
979 int err = 0;
980 int addrcnt = 0;
981 int walk_size = 0;
982 union sctp_addr *sa_addr = NULL;
983 void *addr_buf;
984 unsigned short port;
985 unsigned int f_flags = 0;
987 sp = sctp_sk(sk);
988 ep = sp->ep;
990 /* connect() cannot be done on a socket that is already in ESTABLISHED
991 * state - UDP-style peeled off socket or a TCP-style socket that
992 * is already connected.
993 * It cannot be done even on a TCP-style listening socket.
995 if (sctp_sstate(sk, ESTABLISHED) ||
996 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
997 err = -EISCONN;
998 goto out_free;
1001 /* Walk through the addrs buffer and count the number of addresses. */
1002 addr_buf = kaddrs;
1003 while (walk_size < addrs_size) {
1004 sa_addr = (union sctp_addr *)addr_buf;
1005 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1006 port = ntohs(sa_addr->v4.sin_port);
1008 /* If the address family is not supported or if this address
1009 * causes the address buffer to overflow return EINVAL.
1011 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1012 err = -EINVAL;
1013 goto out_free;
1016 /* Save current address so we can work with it */
1017 memcpy(&to, sa_addr, af->sockaddr_len);
1019 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1020 if (err)
1021 goto out_free;
1023 /* Make sure the destination port is correctly set
1024 * in all addresses.
1026 if (asoc && asoc->peer.port && asoc->peer.port != port)
1027 goto out_free;
1030 /* Check if there already is a matching association on the
1031 * endpoint (other than the one created here).
1033 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1034 if (asoc2 && asoc2 != asoc) {
1035 if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1036 err = -EISCONN;
1037 else
1038 err = -EALREADY;
1039 goto out_free;
1042 /* If we could not find a matching association on the endpoint,
1043 * make sure that there is no peeled-off association matching
1044 * the peer address even on another socket.
1046 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1047 err = -EADDRNOTAVAIL;
1048 goto out_free;
1051 if (!asoc) {
1052 /* If a bind() or sctp_bindx() is not called prior to
1053 * an sctp_connectx() call, the system picks an
1054 * ephemeral port and will choose an address set
1055 * equivalent to binding with a wildcard address.
1057 if (!ep->base.bind_addr.port) {
1058 if (sctp_autobind(sk)) {
1059 err = -EAGAIN;
1060 goto out_free;
1062 } else {
1064 * If an unprivileged user inherits a 1-many
1065 * style socket with open associations on a
1066 * privileged port, it MAY be permitted to
1067 * accept new associations, but it SHOULD NOT
1068 * be permitted to open new associations.
1070 if (ep->base.bind_addr.port < PROT_SOCK &&
1071 !capable(CAP_NET_BIND_SERVICE)) {
1072 err = -EACCES;
1073 goto out_free;
1077 scope = sctp_scope(&to);
1078 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1079 if (!asoc) {
1080 err = -ENOMEM;
1081 goto out_free;
1085 /* Prime the peer's transport structures. */
1086 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1087 SCTP_UNKNOWN);
1088 if (!transport) {
1089 err = -ENOMEM;
1090 goto out_free;
1093 addrcnt++;
1094 addr_buf += af->sockaddr_len;
1095 walk_size += af->sockaddr_len;
1098 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1099 if (err < 0) {
1100 goto out_free;
1103 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1104 if (err < 0) {
1105 goto out_free;
1108 /* Initialize sk's dport and daddr for getpeername() */
1109 inet_sk(sk)->dport = htons(asoc->peer.port);
1110 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1111 af->to_sk_daddr(sa_addr, sk);
1112 sk->sk_err = 0;
1114 /* in-kernel sockets don't generally have a file allocated to them
1115 * if all they do is call sock_create_kern().
1117 if (sk->sk_socket->file)
1118 f_flags = sk->sk_socket->file->f_flags;
1120 timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1122 err = sctp_wait_for_connect(asoc, &timeo);
1123 if (!err && assoc_id)
1124 *assoc_id = asoc->assoc_id;
1126 /* Don't free association on exit. */
1127 asoc = NULL;
1129 out_free:
1131 SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1132 " kaddrs: %p err: %d\n",
1133 asoc, kaddrs, err);
1134 if (asoc)
1135 sctp_association_free(asoc);
1136 return err;
1139 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1141 * API 8.9
1142 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1143 * sctp_assoc_t *asoc);
1145 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1146 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1147 * or IPv6 addresses.
1149 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1150 * Section 3.1.2 for this usage.
1152 * addrs is a pointer to an array of one or more socket addresses. Each
1153 * address is contained in its appropriate structure (i.e. struct
1154 * sockaddr_in or struct sockaddr_in6) the family of the address type
1155 * must be used to distengish the address length (note that this
1156 * representation is termed a "packed array" of addresses). The caller
1157 * specifies the number of addresses in the array with addrcnt.
1159 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1160 * the association id of the new association. On failure, sctp_connectx()
1161 * returns -1, and sets errno to the appropriate error code. The assoc_id
1162 * is not touched by the kernel.
1164 * For SCTP, the port given in each socket address must be the same, or
1165 * sctp_connectx() will fail, setting errno to EINVAL.
1167 * An application can use sctp_connectx to initiate an association with
1168 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1169 * allows a caller to specify multiple addresses at which a peer can be
1170 * reached. The way the SCTP stack uses the list of addresses to set up
1171 * the association is implementation dependant. This function only
1172 * specifies that the stack will try to make use of all the addresses in
1173 * the list when needed.
1175 * Note that the list of addresses passed in is only used for setting up
1176 * the association. It does not necessarily equal the set of addresses
1177 * the peer uses for the resulting association. If the caller wants to
1178 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1179 * retrieve them after the association has been set up.
1181 * Basically do nothing but copying the addresses from user to kernel
1182 * land and invoking either sctp_connectx(). This is used for tunneling
1183 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1185 * We don't use copy_from_user() for optimization: we first do the
1186 * sanity checks (buffer size -fast- and access check-healthy
1187 * pointer); if all of those succeed, then we can alloc the memory
1188 * (expensive operation) needed to copy the data to kernel. Then we do
1189 * the copying without checking the user space area
1190 * (__copy_from_user()).
1192 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1193 * it.
1195 * sk The sk of the socket
1196 * addrs The pointer to the addresses in user land
1197 * addrssize Size of the addrs buffer
1199 * Returns >=0 if ok, <0 errno code on error.
1201 SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1202 struct sockaddr __user *addrs,
1203 int addrs_size,
1204 sctp_assoc_t *assoc_id)
1206 int err = 0;
1207 struct sockaddr *kaddrs;
1209 SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1210 __func__, sk, addrs, addrs_size);
1212 if (unlikely(addrs_size <= 0))
1213 return -EINVAL;
1215 /* Check the user passed a healthy pointer. */
1216 if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1217 return -EFAULT;
1219 /* Alloc space for the address array in kernel memory. */
1220 kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1221 if (unlikely(!kaddrs))
1222 return -ENOMEM;
1224 if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1225 err = -EFAULT;
1226 } else {
1227 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1230 kfree(kaddrs);
1232 return err;
1236 * This is an older interface. It's kept for backward compatibility
1237 * to the option that doesn't provide association id.
1239 SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1240 struct sockaddr __user *addrs,
1241 int addrs_size)
1243 return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1247 * New interface for the API. The since the API is done with a socket
1248 * option, to make it simple we feed back the association id is as a return
1249 * indication to the call. Error is always negative and association id is
1250 * always positive.
1252 SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1253 struct sockaddr __user *addrs,
1254 int addrs_size)
1256 sctp_assoc_t assoc_id = 0;
1257 int err = 0;
1259 err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1261 if (err)
1262 return err;
1263 else
1264 return assoc_id;
1267 /* API 3.1.4 close() - UDP Style Syntax
1268 * Applications use close() to perform graceful shutdown (as described in
1269 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1270 * by a UDP-style socket.
1272 * The syntax is
1274 * ret = close(int sd);
1276 * sd - the socket descriptor of the associations to be closed.
1278 * To gracefully shutdown a specific association represented by the
1279 * UDP-style socket, an application should use the sendmsg() call,
1280 * passing no user data, but including the appropriate flag in the
1281 * ancillary data (see Section xxxx).
1283 * If sd in the close() call is a branched-off socket representing only
1284 * one association, the shutdown is performed on that association only.
1286 * 4.1.6 close() - TCP Style Syntax
1288 * Applications use close() to gracefully close down an association.
1290 * The syntax is:
1292 * int close(int sd);
1294 * sd - the socket descriptor of the association to be closed.
1296 * After an application calls close() on a socket descriptor, no further
1297 * socket operations will succeed on that descriptor.
1299 * API 7.1.4 SO_LINGER
1301 * An application using the TCP-style socket can use this option to
1302 * perform the SCTP ABORT primitive. The linger option structure is:
1304 * struct linger {
1305 * int l_onoff; // option on/off
1306 * int l_linger; // linger time
1307 * };
1309 * To enable the option, set l_onoff to 1. If the l_linger value is set
1310 * to 0, calling close() is the same as the ABORT primitive. If the
1311 * value is set to a negative value, the setsockopt() call will return
1312 * an error. If the value is set to a positive value linger_time, the
1313 * close() can be blocked for at most linger_time ms. If the graceful
1314 * shutdown phase does not finish during this period, close() will
1315 * return but the graceful shutdown phase continues in the system.
1317 SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1319 struct sctp_endpoint *ep;
1320 struct sctp_association *asoc;
1321 struct list_head *pos, *temp;
1323 SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1325 sctp_lock_sock(sk);
1326 sk->sk_shutdown = SHUTDOWN_MASK;
1328 ep = sctp_sk(sk)->ep;
1330 /* Walk all associations on an endpoint. */
1331 list_for_each_safe(pos, temp, &ep->asocs) {
1332 asoc = list_entry(pos, struct sctp_association, asocs);
1334 if (sctp_style(sk, TCP)) {
1335 /* A closed association can still be in the list if
1336 * it belongs to a TCP-style listening socket that is
1337 * not yet accepted. If so, free it. If not, send an
1338 * ABORT or SHUTDOWN based on the linger options.
1340 if (sctp_state(asoc, CLOSED)) {
1341 sctp_unhash_established(asoc);
1342 sctp_association_free(asoc);
1343 continue;
1347 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
1348 struct sctp_chunk *chunk;
1350 chunk = sctp_make_abort_user(asoc, NULL, 0);
1351 if (chunk)
1352 sctp_primitive_ABORT(asoc, chunk);
1353 } else
1354 sctp_primitive_SHUTDOWN(asoc, NULL);
1357 /* Clean up any skbs sitting on the receive queue. */
1358 sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1359 sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1361 /* On a TCP-style socket, block for at most linger_time if set. */
1362 if (sctp_style(sk, TCP) && timeout)
1363 sctp_wait_for_close(sk, timeout);
1365 /* This will run the backlog queue. */
1366 sctp_release_sock(sk);
1368 /* Supposedly, no process has access to the socket, but
1369 * the net layers still may.
1371 sctp_local_bh_disable();
1372 sctp_bh_lock_sock(sk);
1374 /* Hold the sock, since sk_common_release() will put sock_put()
1375 * and we have just a little more cleanup.
1377 sock_hold(sk);
1378 sk_common_release(sk);
1380 sctp_bh_unlock_sock(sk);
1381 sctp_local_bh_enable();
1383 sock_put(sk);
1385 SCTP_DBG_OBJCNT_DEC(sock);
1388 /* Handle EPIPE error. */
1389 static int sctp_error(struct sock *sk, int flags, int err)
1391 if (err == -EPIPE)
1392 err = sock_error(sk) ? : -EPIPE;
1393 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1394 send_sig(SIGPIPE, current, 0);
1395 return err;
1398 /* API 3.1.3 sendmsg() - UDP Style Syntax
1400 * An application uses sendmsg() and recvmsg() calls to transmit data to
1401 * and receive data from its peer.
1403 * ssize_t sendmsg(int socket, const struct msghdr *message,
1404 * int flags);
1406 * socket - the socket descriptor of the endpoint.
1407 * message - pointer to the msghdr structure which contains a single
1408 * user message and possibly some ancillary data.
1410 * See Section 5 for complete description of the data
1411 * structures.
1413 * flags - flags sent or received with the user message, see Section
1414 * 5 for complete description of the flags.
1416 * Note: This function could use a rewrite especially when explicit
1417 * connect support comes in.
1419 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1421 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1423 SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1424 struct msghdr *msg, size_t msg_len)
1426 struct sctp_sock *sp;
1427 struct sctp_endpoint *ep;
1428 struct sctp_association *new_asoc=NULL, *asoc=NULL;
1429 struct sctp_transport *transport, *chunk_tp;
1430 struct sctp_chunk *chunk;
1431 union sctp_addr to;
1432 struct sockaddr *msg_name = NULL;
1433 struct sctp_sndrcvinfo default_sinfo = { 0 };
1434 struct sctp_sndrcvinfo *sinfo;
1435 struct sctp_initmsg *sinit;
1436 sctp_assoc_t associd = 0;
1437 sctp_cmsgs_t cmsgs = { NULL };
1438 int err;
1439 sctp_scope_t scope;
1440 long timeo;
1441 __u16 sinfo_flags = 0;
1442 struct sctp_datamsg *datamsg;
1443 int msg_flags = msg->msg_flags;
1445 SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1446 sk, msg, msg_len);
1448 err = 0;
1449 sp = sctp_sk(sk);
1450 ep = sp->ep;
1452 SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1454 /* We cannot send a message over a TCP-style listening socket. */
1455 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1456 err = -EPIPE;
1457 goto out_nounlock;
1460 /* Parse out the SCTP CMSGs. */
1461 err = sctp_msghdr_parse(msg, &cmsgs);
1463 if (err) {
1464 SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1465 goto out_nounlock;
1468 /* Fetch the destination address for this packet. This
1469 * address only selects the association--it is not necessarily
1470 * the address we will send to.
1471 * For a peeled-off socket, msg_name is ignored.
1473 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1474 int msg_namelen = msg->msg_namelen;
1476 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1477 msg_namelen);
1478 if (err)
1479 return err;
1481 if (msg_namelen > sizeof(to))
1482 msg_namelen = sizeof(to);
1483 memcpy(&to, msg->msg_name, msg_namelen);
1484 msg_name = msg->msg_name;
1487 sinfo = cmsgs.info;
1488 sinit = cmsgs.init;
1490 /* Did the user specify SNDRCVINFO? */
1491 if (sinfo) {
1492 sinfo_flags = sinfo->sinfo_flags;
1493 associd = sinfo->sinfo_assoc_id;
1496 SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1497 msg_len, sinfo_flags);
1499 /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1500 if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1501 err = -EINVAL;
1502 goto out_nounlock;
1505 /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1506 * length messages when SCTP_EOF|SCTP_ABORT is not set.
1507 * If SCTP_ABORT is set, the message length could be non zero with
1508 * the msg_iov set to the user abort reason.
1510 if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1511 (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1512 err = -EINVAL;
1513 goto out_nounlock;
1516 /* If SCTP_ADDR_OVER is set, there must be an address
1517 * specified in msg_name.
1519 if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1520 err = -EINVAL;
1521 goto out_nounlock;
1524 transport = NULL;
1526 SCTP_DEBUG_PRINTK("About to look up association.\n");
1528 sctp_lock_sock(sk);
1530 /* If a msg_name has been specified, assume this is to be used. */
1531 if (msg_name) {
1532 /* Look for a matching association on the endpoint. */
1533 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1534 if (!asoc) {
1535 /* If we could not find a matching association on the
1536 * endpoint, make sure that it is not a TCP-style
1537 * socket that already has an association or there is
1538 * no peeled-off association on another socket.
1540 if ((sctp_style(sk, TCP) &&
1541 sctp_sstate(sk, ESTABLISHED)) ||
1542 sctp_endpoint_is_peeled_off(ep, &to)) {
1543 err = -EADDRNOTAVAIL;
1544 goto out_unlock;
1547 } else {
1548 asoc = sctp_id2assoc(sk, associd);
1549 if (!asoc) {
1550 err = -EPIPE;
1551 goto out_unlock;
1555 if (asoc) {
1556 SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1558 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1559 * socket that has an association in CLOSED state. This can
1560 * happen when an accepted socket has an association that is
1561 * already CLOSED.
1563 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1564 err = -EPIPE;
1565 goto out_unlock;
1568 if (sinfo_flags & SCTP_EOF) {
1569 SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1570 asoc);
1571 sctp_primitive_SHUTDOWN(asoc, NULL);
1572 err = 0;
1573 goto out_unlock;
1575 if (sinfo_flags & SCTP_ABORT) {
1577 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1578 if (!chunk) {
1579 err = -ENOMEM;
1580 goto out_unlock;
1583 SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1584 sctp_primitive_ABORT(asoc, chunk);
1585 err = 0;
1586 goto out_unlock;
1590 /* Do we need to create the association? */
1591 if (!asoc) {
1592 SCTP_DEBUG_PRINTK("There is no association yet.\n");
1594 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1595 err = -EINVAL;
1596 goto out_unlock;
1599 /* Check for invalid stream against the stream counts,
1600 * either the default or the user specified stream counts.
1602 if (sinfo) {
1603 if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1604 /* Check against the defaults. */
1605 if (sinfo->sinfo_stream >=
1606 sp->initmsg.sinit_num_ostreams) {
1607 err = -EINVAL;
1608 goto out_unlock;
1610 } else {
1611 /* Check against the requested. */
1612 if (sinfo->sinfo_stream >=
1613 sinit->sinit_num_ostreams) {
1614 err = -EINVAL;
1615 goto out_unlock;
1621 * API 3.1.2 bind() - UDP Style Syntax
1622 * If a bind() or sctp_bindx() is not called prior to a
1623 * sendmsg() call that initiates a new association, the
1624 * system picks an ephemeral port and will choose an address
1625 * set equivalent to binding with a wildcard address.
1627 if (!ep->base.bind_addr.port) {
1628 if (sctp_autobind(sk)) {
1629 err = -EAGAIN;
1630 goto out_unlock;
1632 } else {
1634 * If an unprivileged user inherits a one-to-many
1635 * style socket with open associations on a privileged
1636 * port, it MAY be permitted to accept new associations,
1637 * but it SHOULD NOT be permitted to open new
1638 * associations.
1640 if (ep->base.bind_addr.port < PROT_SOCK &&
1641 !capable(CAP_NET_BIND_SERVICE)) {
1642 err = -EACCES;
1643 goto out_unlock;
1647 scope = sctp_scope(&to);
1648 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1649 if (!new_asoc) {
1650 err = -ENOMEM;
1651 goto out_unlock;
1653 asoc = new_asoc;
1655 /* If the SCTP_INIT ancillary data is specified, set all
1656 * the association init values accordingly.
1658 if (sinit) {
1659 if (sinit->sinit_num_ostreams) {
1660 asoc->c.sinit_num_ostreams =
1661 sinit->sinit_num_ostreams;
1663 if (sinit->sinit_max_instreams) {
1664 asoc->c.sinit_max_instreams =
1665 sinit->sinit_max_instreams;
1667 if (sinit->sinit_max_attempts) {
1668 asoc->max_init_attempts
1669 = sinit->sinit_max_attempts;
1671 if (sinit->sinit_max_init_timeo) {
1672 asoc->max_init_timeo =
1673 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1677 /* Prime the peer's transport structures. */
1678 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1679 if (!transport) {
1680 err = -ENOMEM;
1681 goto out_free;
1683 err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
1684 if (err < 0) {
1685 err = -ENOMEM;
1686 goto out_free;
1690 /* ASSERT: we have a valid association at this point. */
1691 SCTP_DEBUG_PRINTK("We have a valid association.\n");
1693 if (!sinfo) {
1694 /* If the user didn't specify SNDRCVINFO, make up one with
1695 * some defaults.
1697 default_sinfo.sinfo_stream = asoc->default_stream;
1698 default_sinfo.sinfo_flags = asoc->default_flags;
1699 default_sinfo.sinfo_ppid = asoc->default_ppid;
1700 default_sinfo.sinfo_context = asoc->default_context;
1701 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1702 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1703 sinfo = &default_sinfo;
1706 /* API 7.1.7, the sndbuf size per association bounds the
1707 * maximum size of data that can be sent in a single send call.
1709 if (msg_len > sk->sk_sndbuf) {
1710 err = -EMSGSIZE;
1711 goto out_free;
1714 if (asoc->pmtu_pending)
1715 sctp_assoc_pending_pmtu(asoc);
1717 /* If fragmentation is disabled and the message length exceeds the
1718 * association fragmentation point, return EMSGSIZE. The I-D
1719 * does not specify what this error is, but this looks like
1720 * a great fit.
1722 if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1723 err = -EMSGSIZE;
1724 goto out_free;
1727 if (sinfo) {
1728 /* Check for invalid stream. */
1729 if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1730 err = -EINVAL;
1731 goto out_free;
1735 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1736 if (!sctp_wspace(asoc)) {
1737 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1738 if (err)
1739 goto out_free;
1742 /* If an address is passed with the sendto/sendmsg call, it is used
1743 * to override the primary destination address in the TCP model, or
1744 * when SCTP_ADDR_OVER flag is set in the UDP model.
1746 if ((sctp_style(sk, TCP) && msg_name) ||
1747 (sinfo_flags & SCTP_ADDR_OVER)) {
1748 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1749 if (!chunk_tp) {
1750 err = -EINVAL;
1751 goto out_free;
1753 } else
1754 chunk_tp = NULL;
1756 /* Auto-connect, if we aren't connected already. */
1757 if (sctp_state(asoc, CLOSED)) {
1758 err = sctp_primitive_ASSOCIATE(asoc, NULL);
1759 if (err < 0)
1760 goto out_free;
1761 SCTP_DEBUG_PRINTK("We associated primitively.\n");
1764 /* Break the message into multiple chunks of maximum size. */
1765 datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1766 if (!datamsg) {
1767 err = -ENOMEM;
1768 goto out_free;
1771 /* Now send the (possibly) fragmented message. */
1772 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1773 sctp_chunk_hold(chunk);
1775 /* Do accounting for the write space. */
1776 sctp_set_owner_w(chunk);
1778 chunk->transport = chunk_tp;
1780 /* Send it to the lower layers. Note: all chunks
1781 * must either fail or succeed. The lower layer
1782 * works that way today. Keep it that way or this
1783 * breaks.
1785 err = sctp_primitive_SEND(asoc, chunk);
1786 /* Did the lower layer accept the chunk? */
1787 if (err)
1788 sctp_chunk_free(chunk);
1789 SCTP_DEBUG_PRINTK("We sent primitively.\n");
1792 sctp_datamsg_put(datamsg);
1793 if (err)
1794 goto out_free;
1795 else
1796 err = msg_len;
1798 /* If we are already past ASSOCIATE, the lower
1799 * layers are responsible for association cleanup.
1801 goto out_unlock;
1803 out_free:
1804 if (new_asoc)
1805 sctp_association_free(asoc);
1806 out_unlock:
1807 sctp_release_sock(sk);
1809 out_nounlock:
1810 return sctp_error(sk, msg_flags, err);
1812 #if 0
1813 do_sock_err:
1814 if (msg_len)
1815 err = msg_len;
1816 else
1817 err = sock_error(sk);
1818 goto out;
1820 do_interrupted:
1821 if (msg_len)
1822 err = msg_len;
1823 goto out;
1824 #endif /* 0 */
1827 /* This is an extended version of skb_pull() that removes the data from the
1828 * start of a skb even when data is spread across the list of skb's in the
1829 * frag_list. len specifies the total amount of data that needs to be removed.
1830 * when 'len' bytes could be removed from the skb, it returns 0.
1831 * If 'len' exceeds the total skb length, it returns the no. of bytes that
1832 * could not be removed.
1834 static int sctp_skb_pull(struct sk_buff *skb, int len)
1836 struct sk_buff *list;
1837 int skb_len = skb_headlen(skb);
1838 int rlen;
1840 if (len <= skb_len) {
1841 __skb_pull(skb, len);
1842 return 0;
1844 len -= skb_len;
1845 __skb_pull(skb, skb_len);
1847 for (list = skb_shinfo(skb)->frag_list; list; list = list->next) {
1848 rlen = sctp_skb_pull(list, len);
1849 skb->len -= (len-rlen);
1850 skb->data_len -= (len-rlen);
1852 if (!rlen)
1853 return 0;
1855 len = rlen;
1858 return len;
1861 /* API 3.1.3 recvmsg() - UDP Style Syntax
1863 * ssize_t recvmsg(int socket, struct msghdr *message,
1864 * int flags);
1866 * socket - the socket descriptor of the endpoint.
1867 * message - pointer to the msghdr structure which contains a single
1868 * user message and possibly some ancillary data.
1870 * See Section 5 for complete description of the data
1871 * structures.
1873 * flags - flags sent or received with the user message, see Section
1874 * 5 for complete description of the flags.
1876 static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
1878 SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
1879 struct msghdr *msg, size_t len, int noblock,
1880 int flags, int *addr_len)
1882 struct sctp_ulpevent *event = NULL;
1883 struct sctp_sock *sp = sctp_sk(sk);
1884 struct sk_buff *skb;
1885 int copied;
1886 int err = 0;
1887 int skb_len;
1889 SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
1890 "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
1891 "len", len, "knoblauch", noblock,
1892 "flags", flags, "addr_len", addr_len);
1894 sctp_lock_sock(sk);
1896 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
1897 err = -ENOTCONN;
1898 goto out;
1901 skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
1902 if (!skb)
1903 goto out;
1905 /* Get the total length of the skb including any skb's in the
1906 * frag_list.
1908 skb_len = skb->len;
1910 copied = skb_len;
1911 if (copied > len)
1912 copied = len;
1914 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1916 event = sctp_skb2event(skb);
1918 if (err)
1919 goto out_free;
1921 sock_recv_timestamp(msg, sk, skb);
1922 if (sctp_ulpevent_is_notification(event)) {
1923 msg->msg_flags |= MSG_NOTIFICATION;
1924 sp->pf->event_msgname(event, msg->msg_name, addr_len);
1925 } else {
1926 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
1929 /* Check if we allow SCTP_SNDRCVINFO. */
1930 if (sp->subscribe.sctp_data_io_event)
1931 sctp_ulpevent_read_sndrcvinfo(event, msg);
1932 #if 0
1933 /* FIXME: we should be calling IP/IPv6 layers. */
1934 if (sk->sk_protinfo.af_inet.cmsg_flags)
1935 ip_cmsg_recv(msg, skb);
1936 #endif
1938 err = copied;
1940 /* If skb's length exceeds the user's buffer, update the skb and
1941 * push it back to the receive_queue so that the next call to
1942 * recvmsg() will return the remaining data. Don't set MSG_EOR.
1944 if (skb_len > copied) {
1945 msg->msg_flags &= ~MSG_EOR;
1946 if (flags & MSG_PEEK)
1947 goto out_free;
1948 sctp_skb_pull(skb, copied);
1949 skb_queue_head(&sk->sk_receive_queue, skb);
1951 /* When only partial message is copied to the user, increase
1952 * rwnd by that amount. If all the data in the skb is read,
1953 * rwnd is updated when the event is freed.
1955 if (!sctp_ulpevent_is_notification(event))
1956 sctp_assoc_rwnd_increase(event->asoc, copied);
1957 goto out;
1958 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
1959 (event->msg_flags & MSG_EOR))
1960 msg->msg_flags |= MSG_EOR;
1961 else
1962 msg->msg_flags &= ~MSG_EOR;
1964 out_free:
1965 if (flags & MSG_PEEK) {
1966 /* Release the skb reference acquired after peeking the skb in
1967 * sctp_skb_recv_datagram().
1969 kfree_skb(skb);
1970 } else {
1971 /* Free the event which includes releasing the reference to
1972 * the owner of the skb, freeing the skb and updating the
1973 * rwnd.
1975 sctp_ulpevent_free(event);
1977 out:
1978 sctp_release_sock(sk);
1979 return err;
1982 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
1984 * This option is a on/off flag. If enabled no SCTP message
1985 * fragmentation will be performed. Instead if a message being sent
1986 * exceeds the current PMTU size, the message will NOT be sent and
1987 * instead a error will be indicated to the user.
1989 static int sctp_setsockopt_disable_fragments(struct sock *sk,
1990 char __user *optval, int optlen)
1992 int val;
1994 if (optlen < sizeof(int))
1995 return -EINVAL;
1997 if (get_user(val, (int __user *)optval))
1998 return -EFAULT;
2000 sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2002 return 0;
2005 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2006 int optlen)
2008 if (optlen > sizeof(struct sctp_event_subscribe))
2009 return -EINVAL;
2010 if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2011 return -EFAULT;
2012 return 0;
2015 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2017 * This socket option is applicable to the UDP-style socket only. When
2018 * set it will cause associations that are idle for more than the
2019 * specified number of seconds to automatically close. An association
2020 * being idle is defined an association that has NOT sent or received
2021 * user data. The special value of '0' indicates that no automatic
2022 * close of any associations should be performed. The option expects an
2023 * integer defining the number of seconds of idle time before an
2024 * association is closed.
2026 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2027 int optlen)
2029 struct sctp_sock *sp = sctp_sk(sk);
2031 /* Applicable to UDP-style socket only */
2032 if (sctp_style(sk, TCP))
2033 return -EOPNOTSUPP;
2034 if (optlen != sizeof(int))
2035 return -EINVAL;
2036 if (copy_from_user(&sp->autoclose, optval, optlen))
2037 return -EFAULT;
2039 return 0;
2042 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2044 * Applications can enable or disable heartbeats for any peer address of
2045 * an association, modify an address's heartbeat interval, force a
2046 * heartbeat to be sent immediately, and adjust the address's maximum
2047 * number of retransmissions sent before an address is considered
2048 * unreachable. The following structure is used to access and modify an
2049 * address's parameters:
2051 * struct sctp_paddrparams {
2052 * sctp_assoc_t spp_assoc_id;
2053 * struct sockaddr_storage spp_address;
2054 * uint32_t spp_hbinterval;
2055 * uint16_t spp_pathmaxrxt;
2056 * uint32_t spp_pathmtu;
2057 * uint32_t spp_sackdelay;
2058 * uint32_t spp_flags;
2059 * };
2061 * spp_assoc_id - (one-to-many style socket) This is filled in the
2062 * application, and identifies the association for
2063 * this query.
2064 * spp_address - This specifies which address is of interest.
2065 * spp_hbinterval - This contains the value of the heartbeat interval,
2066 * in milliseconds. If a value of zero
2067 * is present in this field then no changes are to
2068 * be made to this parameter.
2069 * spp_pathmaxrxt - This contains the maximum number of
2070 * retransmissions before this address shall be
2071 * considered unreachable. If a value of zero
2072 * is present in this field then no changes are to
2073 * be made to this parameter.
2074 * spp_pathmtu - When Path MTU discovery is disabled the value
2075 * specified here will be the "fixed" path mtu.
2076 * Note that if the spp_address field is empty
2077 * then all associations on this address will
2078 * have this fixed path mtu set upon them.
2080 * spp_sackdelay - When delayed sack is enabled, this value specifies
2081 * the number of milliseconds that sacks will be delayed
2082 * for. This value will apply to all addresses of an
2083 * association if the spp_address field is empty. Note
2084 * also, that if delayed sack is enabled and this
2085 * value is set to 0, no change is made to the last
2086 * recorded delayed sack timer value.
2088 * spp_flags - These flags are used to control various features
2089 * on an association. The flag field may contain
2090 * zero or more of the following options.
2092 * SPP_HB_ENABLE - Enable heartbeats on the
2093 * specified address. Note that if the address
2094 * field is empty all addresses for the association
2095 * have heartbeats enabled upon them.
2097 * SPP_HB_DISABLE - Disable heartbeats on the
2098 * speicifed address. Note that if the address
2099 * field is empty all addresses for the association
2100 * will have their heartbeats disabled. Note also
2101 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2102 * mutually exclusive, only one of these two should
2103 * be specified. Enabling both fields will have
2104 * undetermined results.
2106 * SPP_HB_DEMAND - Request a user initiated heartbeat
2107 * to be made immediately.
2109 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2110 * heartbeat delayis to be set to the value of 0
2111 * milliseconds.
2113 * SPP_PMTUD_ENABLE - This field will enable PMTU
2114 * discovery upon the specified address. Note that
2115 * if the address feild is empty then all addresses
2116 * on the association are effected.
2118 * SPP_PMTUD_DISABLE - This field will disable PMTU
2119 * discovery upon the specified address. Note that
2120 * if the address feild is empty then all addresses
2121 * on the association are effected. Not also that
2122 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2123 * exclusive. Enabling both will have undetermined
2124 * results.
2126 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2127 * on delayed sack. The time specified in spp_sackdelay
2128 * is used to specify the sack delay for this address. Note
2129 * that if spp_address is empty then all addresses will
2130 * enable delayed sack and take on the sack delay
2131 * value specified in spp_sackdelay.
2132 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2133 * off delayed sack. If the spp_address field is blank then
2134 * delayed sack is disabled for the entire association. Note
2135 * also that this field is mutually exclusive to
2136 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2137 * results.
2139 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2140 struct sctp_transport *trans,
2141 struct sctp_association *asoc,
2142 struct sctp_sock *sp,
2143 int hb_change,
2144 int pmtud_change,
2145 int sackdelay_change)
2147 int error;
2149 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2150 error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans);
2151 if (error)
2152 return error;
2155 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2156 * this field is ignored. Note also that a value of zero indicates
2157 * the current setting should be left unchanged.
2159 if (params->spp_flags & SPP_HB_ENABLE) {
2161 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2162 * set. This lets us use 0 value when this flag
2163 * is set.
2165 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2166 params->spp_hbinterval = 0;
2168 if (params->spp_hbinterval ||
2169 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2170 if (trans) {
2171 trans->hbinterval =
2172 msecs_to_jiffies(params->spp_hbinterval);
2173 } else if (asoc) {
2174 asoc->hbinterval =
2175 msecs_to_jiffies(params->spp_hbinterval);
2176 } else {
2177 sp->hbinterval = params->spp_hbinterval;
2182 if (hb_change) {
2183 if (trans) {
2184 trans->param_flags =
2185 (trans->param_flags & ~SPP_HB) | hb_change;
2186 } else if (asoc) {
2187 asoc->param_flags =
2188 (asoc->param_flags & ~SPP_HB) | hb_change;
2189 } else {
2190 sp->param_flags =
2191 (sp->param_flags & ~SPP_HB) | hb_change;
2195 /* When Path MTU discovery is disabled the value specified here will
2196 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2197 * include the flag SPP_PMTUD_DISABLE for this field to have any
2198 * effect).
2200 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2201 if (trans) {
2202 trans->pathmtu = params->spp_pathmtu;
2203 sctp_assoc_sync_pmtu(asoc);
2204 } else if (asoc) {
2205 asoc->pathmtu = params->spp_pathmtu;
2206 sctp_frag_point(sp, params->spp_pathmtu);
2207 } else {
2208 sp->pathmtu = params->spp_pathmtu;
2212 if (pmtud_change) {
2213 if (trans) {
2214 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2215 (params->spp_flags & SPP_PMTUD_ENABLE);
2216 trans->param_flags =
2217 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2218 if (update) {
2219 sctp_transport_pmtu(trans);
2220 sctp_assoc_sync_pmtu(asoc);
2222 } else if (asoc) {
2223 asoc->param_flags =
2224 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2225 } else {
2226 sp->param_flags =
2227 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2231 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2232 * value of this field is ignored. Note also that a value of zero
2233 * indicates the current setting should be left unchanged.
2235 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2236 if (trans) {
2237 trans->sackdelay =
2238 msecs_to_jiffies(params->spp_sackdelay);
2239 } else if (asoc) {
2240 asoc->sackdelay =
2241 msecs_to_jiffies(params->spp_sackdelay);
2242 } else {
2243 sp->sackdelay = params->spp_sackdelay;
2247 if (sackdelay_change) {
2248 if (trans) {
2249 trans->param_flags =
2250 (trans->param_flags & ~SPP_SACKDELAY) |
2251 sackdelay_change;
2252 } else if (asoc) {
2253 asoc->param_flags =
2254 (asoc->param_flags & ~SPP_SACKDELAY) |
2255 sackdelay_change;
2256 } else {
2257 sp->param_flags =
2258 (sp->param_flags & ~SPP_SACKDELAY) |
2259 sackdelay_change;
2263 /* Note that unless the spp_flag is set to SPP_PMTUD_ENABLE the value
2264 * of this field is ignored. Note also that a value of zero
2265 * indicates the current setting should be left unchanged.
2267 if ((params->spp_flags & SPP_PMTUD_ENABLE) && params->spp_pathmaxrxt) {
2268 if (trans) {
2269 trans->pathmaxrxt = params->spp_pathmaxrxt;
2270 } else if (asoc) {
2271 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2272 } else {
2273 sp->pathmaxrxt = params->spp_pathmaxrxt;
2277 return 0;
2280 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2281 char __user *optval, int optlen)
2283 struct sctp_paddrparams params;
2284 struct sctp_transport *trans = NULL;
2285 struct sctp_association *asoc = NULL;
2286 struct sctp_sock *sp = sctp_sk(sk);
2287 int error;
2288 int hb_change, pmtud_change, sackdelay_change;
2290 if (optlen != sizeof(struct sctp_paddrparams))
2291 return - EINVAL;
2293 if (copy_from_user(&params, optval, optlen))
2294 return -EFAULT;
2296 /* Validate flags and value parameters. */
2297 hb_change = params.spp_flags & SPP_HB;
2298 pmtud_change = params.spp_flags & SPP_PMTUD;
2299 sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2301 if (hb_change == SPP_HB ||
2302 pmtud_change == SPP_PMTUD ||
2303 sackdelay_change == SPP_SACKDELAY ||
2304 params.spp_sackdelay > 500 ||
2305 (params.spp_pathmtu
2306 && params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2307 return -EINVAL;
2309 /* If an address other than INADDR_ANY is specified, and
2310 * no transport is found, then the request is invalid.
2312 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
2313 trans = sctp_addr_id2transport(sk, &params.spp_address,
2314 params.spp_assoc_id);
2315 if (!trans)
2316 return -EINVAL;
2319 /* Get association, if assoc_id != 0 and the socket is a one
2320 * to many style socket, and an association was not found, then
2321 * the id was invalid.
2323 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2324 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2325 return -EINVAL;
2327 /* Heartbeat demand can only be sent on a transport or
2328 * association, but not a socket.
2330 if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2331 return -EINVAL;
2333 /* Process parameters. */
2334 error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2335 hb_change, pmtud_change,
2336 sackdelay_change);
2338 if (error)
2339 return error;
2341 /* If changes are for association, also apply parameters to each
2342 * transport.
2344 if (!trans && asoc) {
2345 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2346 transports) {
2347 sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2348 hb_change, pmtud_change,
2349 sackdelay_change);
2353 return 0;
2357 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2359 * This option will effect the way delayed acks are performed. This
2360 * option allows you to get or set the delayed ack time, in
2361 * milliseconds. It also allows changing the delayed ack frequency.
2362 * Changing the frequency to 1 disables the delayed sack algorithm. If
2363 * the assoc_id is 0, then this sets or gets the endpoints default
2364 * values. If the assoc_id field is non-zero, then the set or get
2365 * effects the specified association for the one to many model (the
2366 * assoc_id field is ignored by the one to one model). Note that if
2367 * sack_delay or sack_freq are 0 when setting this option, then the
2368 * current values will remain unchanged.
2370 * struct sctp_sack_info {
2371 * sctp_assoc_t sack_assoc_id;
2372 * uint32_t sack_delay;
2373 * uint32_t sack_freq;
2374 * };
2376 * sack_assoc_id - This parameter, indicates which association the user
2377 * is performing an action upon. Note that if this field's value is
2378 * zero then the endpoints default value is changed (effecting future
2379 * associations only).
2381 * sack_delay - This parameter contains the number of milliseconds that
2382 * the user is requesting the delayed ACK timer be set to. Note that
2383 * this value is defined in the standard to be between 200 and 500
2384 * milliseconds.
2386 * sack_freq - This parameter contains the number of packets that must
2387 * be received before a sack is sent without waiting for the delay
2388 * timer to expire. The default value for this is 2, setting this
2389 * value to 1 will disable the delayed sack algorithm.
2392 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2393 char __user *optval, int optlen)
2395 struct sctp_sack_info params;
2396 struct sctp_transport *trans = NULL;
2397 struct sctp_association *asoc = NULL;
2398 struct sctp_sock *sp = sctp_sk(sk);
2400 if (optlen == sizeof(struct sctp_sack_info)) {
2401 if (copy_from_user(&params, optval, optlen))
2402 return -EFAULT;
2404 if (params.sack_delay == 0 && params.sack_freq == 0)
2405 return 0;
2406 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2407 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
2408 "in delayed_ack socket option deprecated\n");
2409 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
2410 if (copy_from_user(&params, optval, optlen))
2411 return -EFAULT;
2413 if (params.sack_delay == 0)
2414 params.sack_freq = 1;
2415 else
2416 params.sack_freq = 0;
2417 } else
2418 return - EINVAL;
2420 /* Validate value parameter. */
2421 if (params.sack_delay > 500)
2422 return -EINVAL;
2424 /* Get association, if sack_assoc_id != 0 and the socket is a one
2425 * to many style socket, and an association was not found, then
2426 * the id was invalid.
2428 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2429 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2430 return -EINVAL;
2432 if (params.sack_delay) {
2433 if (asoc) {
2434 asoc->sackdelay =
2435 msecs_to_jiffies(params.sack_delay);
2436 asoc->param_flags =
2437 (asoc->param_flags & ~SPP_SACKDELAY) |
2438 SPP_SACKDELAY_ENABLE;
2439 } else {
2440 sp->sackdelay = params.sack_delay;
2441 sp->param_flags =
2442 (sp->param_flags & ~SPP_SACKDELAY) |
2443 SPP_SACKDELAY_ENABLE;
2447 if (params.sack_freq == 1) {
2448 if (asoc) {
2449 asoc->param_flags =
2450 (asoc->param_flags & ~SPP_SACKDELAY) |
2451 SPP_SACKDELAY_DISABLE;
2452 } else {
2453 sp->param_flags =
2454 (sp->param_flags & ~SPP_SACKDELAY) |
2455 SPP_SACKDELAY_DISABLE;
2457 } else if (params.sack_freq > 1) {
2458 if (asoc) {
2459 asoc->sackfreq = params.sack_freq;
2460 asoc->param_flags =
2461 (asoc->param_flags & ~SPP_SACKDELAY) |
2462 SPP_SACKDELAY_ENABLE;
2463 } else {
2464 sp->sackfreq = params.sack_freq;
2465 sp->param_flags =
2466 (sp->param_flags & ~SPP_SACKDELAY) |
2467 SPP_SACKDELAY_ENABLE;
2471 /* If change is for association, also apply to each transport. */
2472 if (asoc) {
2473 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2474 transports) {
2475 if (params.sack_delay) {
2476 trans->sackdelay =
2477 msecs_to_jiffies(params.sack_delay);
2478 trans->param_flags =
2479 (trans->param_flags & ~SPP_SACKDELAY) |
2480 SPP_SACKDELAY_ENABLE;
2482 if (params.sack_freq == 1) {
2483 trans->param_flags =
2484 (trans->param_flags & ~SPP_SACKDELAY) |
2485 SPP_SACKDELAY_DISABLE;
2486 } else if (params.sack_freq > 1) {
2487 trans->sackfreq = params.sack_freq;
2488 trans->param_flags =
2489 (trans->param_flags & ~SPP_SACKDELAY) |
2490 SPP_SACKDELAY_ENABLE;
2495 return 0;
2498 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2500 * Applications can specify protocol parameters for the default association
2501 * initialization. The option name argument to setsockopt() and getsockopt()
2502 * is SCTP_INITMSG.
2504 * Setting initialization parameters is effective only on an unconnected
2505 * socket (for UDP-style sockets only future associations are effected
2506 * by the change). With TCP-style sockets, this option is inherited by
2507 * sockets derived from a listener socket.
2509 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, int optlen)
2511 struct sctp_initmsg sinit;
2512 struct sctp_sock *sp = sctp_sk(sk);
2514 if (optlen != sizeof(struct sctp_initmsg))
2515 return -EINVAL;
2516 if (copy_from_user(&sinit, optval, optlen))
2517 return -EFAULT;
2519 if (sinit.sinit_num_ostreams)
2520 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2521 if (sinit.sinit_max_instreams)
2522 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2523 if (sinit.sinit_max_attempts)
2524 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2525 if (sinit.sinit_max_init_timeo)
2526 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2528 return 0;
2532 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2534 * Applications that wish to use the sendto() system call may wish to
2535 * specify a default set of parameters that would normally be supplied
2536 * through the inclusion of ancillary data. This socket option allows
2537 * such an application to set the default sctp_sndrcvinfo structure.
2538 * The application that wishes to use this socket option simply passes
2539 * in to this call the sctp_sndrcvinfo structure defined in Section
2540 * 5.2.2) The input parameters accepted by this call include
2541 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2542 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2543 * to this call if the caller is using the UDP model.
2545 static int sctp_setsockopt_default_send_param(struct sock *sk,
2546 char __user *optval, int optlen)
2548 struct sctp_sndrcvinfo info;
2549 struct sctp_association *asoc;
2550 struct sctp_sock *sp = sctp_sk(sk);
2552 if (optlen != sizeof(struct sctp_sndrcvinfo))
2553 return -EINVAL;
2554 if (copy_from_user(&info, optval, optlen))
2555 return -EFAULT;
2557 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2558 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2559 return -EINVAL;
2561 if (asoc) {
2562 asoc->default_stream = info.sinfo_stream;
2563 asoc->default_flags = info.sinfo_flags;
2564 asoc->default_ppid = info.sinfo_ppid;
2565 asoc->default_context = info.sinfo_context;
2566 asoc->default_timetolive = info.sinfo_timetolive;
2567 } else {
2568 sp->default_stream = info.sinfo_stream;
2569 sp->default_flags = info.sinfo_flags;
2570 sp->default_ppid = info.sinfo_ppid;
2571 sp->default_context = info.sinfo_context;
2572 sp->default_timetolive = info.sinfo_timetolive;
2575 return 0;
2578 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2580 * Requests that the local SCTP stack use the enclosed peer address as
2581 * the association primary. The enclosed address must be one of the
2582 * association peer's addresses.
2584 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2585 int optlen)
2587 struct sctp_prim prim;
2588 struct sctp_transport *trans;
2590 if (optlen != sizeof(struct sctp_prim))
2591 return -EINVAL;
2593 if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2594 return -EFAULT;
2596 trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2597 if (!trans)
2598 return -EINVAL;
2600 sctp_assoc_set_primary(trans->asoc, trans);
2602 return 0;
2606 * 7.1.5 SCTP_NODELAY
2608 * Turn on/off any Nagle-like algorithm. This means that packets are
2609 * generally sent as soon as possible and no unnecessary delays are
2610 * introduced, at the cost of more packets in the network. Expects an
2611 * integer boolean flag.
2613 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2614 int optlen)
2616 int val;
2618 if (optlen < sizeof(int))
2619 return -EINVAL;
2620 if (get_user(val, (int __user *)optval))
2621 return -EFAULT;
2623 sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2624 return 0;
2629 * 7.1.1 SCTP_RTOINFO
2631 * The protocol parameters used to initialize and bound retransmission
2632 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2633 * and modify these parameters.
2634 * All parameters are time values, in milliseconds. A value of 0, when
2635 * modifying the parameters, indicates that the current value should not
2636 * be changed.
2639 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, int optlen) {
2640 struct sctp_rtoinfo rtoinfo;
2641 struct sctp_association *asoc;
2643 if (optlen != sizeof (struct sctp_rtoinfo))
2644 return -EINVAL;
2646 if (copy_from_user(&rtoinfo, optval, optlen))
2647 return -EFAULT;
2649 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2651 /* Set the values to the specific association */
2652 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2653 return -EINVAL;
2655 if (asoc) {
2656 if (rtoinfo.srto_initial != 0)
2657 asoc->rto_initial =
2658 msecs_to_jiffies(rtoinfo.srto_initial);
2659 if (rtoinfo.srto_max != 0)
2660 asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2661 if (rtoinfo.srto_min != 0)
2662 asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2663 } else {
2664 /* If there is no association or the association-id = 0
2665 * set the values to the endpoint.
2667 struct sctp_sock *sp = sctp_sk(sk);
2669 if (rtoinfo.srto_initial != 0)
2670 sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2671 if (rtoinfo.srto_max != 0)
2672 sp->rtoinfo.srto_max = rtoinfo.srto_max;
2673 if (rtoinfo.srto_min != 0)
2674 sp->rtoinfo.srto_min = rtoinfo.srto_min;
2677 return 0;
2682 * 7.1.2 SCTP_ASSOCINFO
2684 * This option is used to tune the maximum retransmission attempts
2685 * of the association.
2686 * Returns an error if the new association retransmission value is
2687 * greater than the sum of the retransmission value of the peer.
2688 * See [SCTP] for more information.
2691 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int optlen)
2694 struct sctp_assocparams assocparams;
2695 struct sctp_association *asoc;
2697 if (optlen != sizeof(struct sctp_assocparams))
2698 return -EINVAL;
2699 if (copy_from_user(&assocparams, optval, optlen))
2700 return -EFAULT;
2702 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2704 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2705 return -EINVAL;
2707 /* Set the values to the specific association */
2708 if (asoc) {
2709 if (assocparams.sasoc_asocmaxrxt != 0) {
2710 __u32 path_sum = 0;
2711 int paths = 0;
2712 struct sctp_transport *peer_addr;
2714 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2715 transports) {
2716 path_sum += peer_addr->pathmaxrxt;
2717 paths++;
2720 /* Only validate asocmaxrxt if we have more than
2721 * one path/transport. We do this because path
2722 * retransmissions are only counted when we have more
2723 * then one path.
2725 if (paths > 1 &&
2726 assocparams.sasoc_asocmaxrxt > path_sum)
2727 return -EINVAL;
2729 asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2732 if (assocparams.sasoc_cookie_life != 0) {
2733 asoc->cookie_life.tv_sec =
2734 assocparams.sasoc_cookie_life / 1000;
2735 asoc->cookie_life.tv_usec =
2736 (assocparams.sasoc_cookie_life % 1000)
2737 * 1000;
2739 } else {
2740 /* Set the values to the endpoint */
2741 struct sctp_sock *sp = sctp_sk(sk);
2743 if (assocparams.sasoc_asocmaxrxt != 0)
2744 sp->assocparams.sasoc_asocmaxrxt =
2745 assocparams.sasoc_asocmaxrxt;
2746 if (assocparams.sasoc_cookie_life != 0)
2747 sp->assocparams.sasoc_cookie_life =
2748 assocparams.sasoc_cookie_life;
2750 return 0;
2754 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2756 * This socket option is a boolean flag which turns on or off mapped V4
2757 * addresses. If this option is turned on and the socket is type
2758 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2759 * If this option is turned off, then no mapping will be done of V4
2760 * addresses and a user will receive both PF_INET6 and PF_INET type
2761 * addresses on the socket.
2763 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, int optlen)
2765 int val;
2766 struct sctp_sock *sp = sctp_sk(sk);
2768 if (optlen < sizeof(int))
2769 return -EINVAL;
2770 if (get_user(val, (int __user *)optval))
2771 return -EFAULT;
2772 if (val)
2773 sp->v4mapped = 1;
2774 else
2775 sp->v4mapped = 0;
2777 return 0;
2781 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2782 * This option will get or set the maximum size to put in any outgoing
2783 * SCTP DATA chunk. If a message is larger than this size it will be
2784 * fragmented by SCTP into the specified size. Note that the underlying
2785 * SCTP implementation may fragment into smaller sized chunks when the
2786 * PMTU of the underlying association is smaller than the value set by
2787 * the user. The default value for this option is '0' which indicates
2788 * the user is NOT limiting fragmentation and only the PMTU will effect
2789 * SCTP's choice of DATA chunk size. Note also that values set larger
2790 * than the maximum size of an IP datagram will effectively let SCTP
2791 * control fragmentation (i.e. the same as setting this option to 0).
2793 * The following structure is used to access and modify this parameter:
2795 * struct sctp_assoc_value {
2796 * sctp_assoc_t assoc_id;
2797 * uint32_t assoc_value;
2798 * };
2800 * assoc_id: This parameter is ignored for one-to-one style sockets.
2801 * For one-to-many style sockets this parameter indicates which
2802 * association the user is performing an action upon. Note that if
2803 * this field's value is zero then the endpoints default value is
2804 * changed (effecting future associations only).
2805 * assoc_value: This parameter specifies the maximum size in bytes.
2807 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, int optlen)
2809 struct sctp_assoc_value params;
2810 struct sctp_association *asoc;
2811 struct sctp_sock *sp = sctp_sk(sk);
2812 int val;
2814 if (optlen == sizeof(int)) {
2815 printk(KERN_WARNING
2816 "SCTP: Use of int in maxseg socket option deprecated\n");
2817 printk(KERN_WARNING
2818 "SCTP: Use struct sctp_assoc_value instead\n");
2819 if (copy_from_user(&val, optval, optlen))
2820 return -EFAULT;
2821 params.assoc_id = 0;
2822 } else if (optlen == sizeof(struct sctp_assoc_value)) {
2823 if (copy_from_user(&params, optval, optlen))
2824 return -EFAULT;
2825 val = params.assoc_value;
2826 } else
2827 return -EINVAL;
2829 if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
2830 return -EINVAL;
2832 asoc = sctp_id2assoc(sk, params.assoc_id);
2833 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
2834 return -EINVAL;
2836 if (asoc) {
2837 if (val == 0) {
2838 val = asoc->pathmtu;
2839 val -= sp->pf->af->net_header_len;
2840 val -= sizeof(struct sctphdr) +
2841 sizeof(struct sctp_data_chunk);
2844 asoc->frag_point = val;
2845 } else {
2846 sp->user_frag = val;
2848 /* Update the frag_point of the existing associations. */
2849 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
2850 asoc->frag_point = sctp_frag_point(sp, asoc->pathmtu);
2854 return 0;
2859 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
2861 * Requests that the peer mark the enclosed address as the association
2862 * primary. The enclosed address must be one of the association's
2863 * locally bound addresses. The following structure is used to make a
2864 * set primary request:
2866 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
2867 int optlen)
2869 struct sctp_sock *sp;
2870 struct sctp_endpoint *ep;
2871 struct sctp_association *asoc = NULL;
2872 struct sctp_setpeerprim prim;
2873 struct sctp_chunk *chunk;
2874 int err;
2876 sp = sctp_sk(sk);
2877 ep = sp->ep;
2879 if (!sctp_addip_enable)
2880 return -EPERM;
2882 if (optlen != sizeof(struct sctp_setpeerprim))
2883 return -EINVAL;
2885 if (copy_from_user(&prim, optval, optlen))
2886 return -EFAULT;
2888 asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
2889 if (!asoc)
2890 return -EINVAL;
2892 if (!asoc->peer.asconf_capable)
2893 return -EPERM;
2895 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
2896 return -EPERM;
2898 if (!sctp_state(asoc, ESTABLISHED))
2899 return -ENOTCONN;
2901 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
2902 return -EADDRNOTAVAIL;
2904 /* Create an ASCONF chunk with SET_PRIMARY parameter */
2905 chunk = sctp_make_asconf_set_prim(asoc,
2906 (union sctp_addr *)&prim.sspp_addr);
2907 if (!chunk)
2908 return -ENOMEM;
2910 err = sctp_send_asconf(asoc, chunk);
2912 SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
2914 return err;
2917 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
2918 int optlen)
2920 struct sctp_setadaptation adaptation;
2922 if (optlen != sizeof(struct sctp_setadaptation))
2923 return -EINVAL;
2924 if (copy_from_user(&adaptation, optval, optlen))
2925 return -EFAULT;
2927 sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
2929 return 0;
2933 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
2935 * The context field in the sctp_sndrcvinfo structure is normally only
2936 * used when a failed message is retrieved holding the value that was
2937 * sent down on the actual send call. This option allows the setting of
2938 * a default context on an association basis that will be received on
2939 * reading messages from the peer. This is especially helpful in the
2940 * one-2-many model for an application to keep some reference to an
2941 * internal state machine that is processing messages on the
2942 * association. Note that the setting of this value only effects
2943 * received messages from the peer and does not effect the value that is
2944 * saved with outbound messages.
2946 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
2947 int optlen)
2949 struct sctp_assoc_value params;
2950 struct sctp_sock *sp;
2951 struct sctp_association *asoc;
2953 if (optlen != sizeof(struct sctp_assoc_value))
2954 return -EINVAL;
2955 if (copy_from_user(&params, optval, optlen))
2956 return -EFAULT;
2958 sp = sctp_sk(sk);
2960 if (params.assoc_id != 0) {
2961 asoc = sctp_id2assoc(sk, params.assoc_id);
2962 if (!asoc)
2963 return -EINVAL;
2964 asoc->default_rcv_context = params.assoc_value;
2965 } else {
2966 sp->default_rcv_context = params.assoc_value;
2969 return 0;
2973 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
2975 * This options will at a minimum specify if the implementation is doing
2976 * fragmented interleave. Fragmented interleave, for a one to many
2977 * socket, is when subsequent calls to receive a message may return
2978 * parts of messages from different associations. Some implementations
2979 * may allow you to turn this value on or off. If so, when turned off,
2980 * no fragment interleave will occur (which will cause a head of line
2981 * blocking amongst multiple associations sharing the same one to many
2982 * socket). When this option is turned on, then each receive call may
2983 * come from a different association (thus the user must receive data
2984 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
2985 * association each receive belongs to.
2987 * This option takes a boolean value. A non-zero value indicates that
2988 * fragmented interleave is on. A value of zero indicates that
2989 * fragmented interleave is off.
2991 * Note that it is important that an implementation that allows this
2992 * option to be turned on, have it off by default. Otherwise an unaware
2993 * application using the one to many model may become confused and act
2994 * incorrectly.
2996 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
2997 char __user *optval,
2998 int optlen)
3000 int val;
3002 if (optlen != sizeof(int))
3003 return -EINVAL;
3004 if (get_user(val, (int __user *)optval))
3005 return -EFAULT;
3007 sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3009 return 0;
3013 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3014 * (SCTP_PARTIAL_DELIVERY_POINT)
3016 * This option will set or get the SCTP partial delivery point. This
3017 * point is the size of a message where the partial delivery API will be
3018 * invoked to help free up rwnd space for the peer. Setting this to a
3019 * lower value will cause partial deliveries to happen more often. The
3020 * calls argument is an integer that sets or gets the partial delivery
3021 * point. Note also that the call will fail if the user attempts to set
3022 * this value larger than the socket receive buffer size.
3024 * Note that any single message having a length smaller than or equal to
3025 * the SCTP partial delivery point will be delivered in one single read
3026 * call as long as the user provided buffer is large enough to hold the
3027 * message.
3029 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3030 char __user *optval,
3031 int optlen)
3033 u32 val;
3035 if (optlen != sizeof(u32))
3036 return -EINVAL;
3037 if (get_user(val, (int __user *)optval))
3038 return -EFAULT;
3040 /* Note: We double the receive buffer from what the user sets
3041 * it to be, also initial rwnd is based on rcvbuf/2.
3043 if (val > (sk->sk_rcvbuf >> 1))
3044 return -EINVAL;
3046 sctp_sk(sk)->pd_point = val;
3048 return 0; /* is this the right error code? */
3052 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3054 * This option will allow a user to change the maximum burst of packets
3055 * that can be emitted by this association. Note that the default value
3056 * is 4, and some implementations may restrict this setting so that it
3057 * can only be lowered.
3059 * NOTE: This text doesn't seem right. Do this on a socket basis with
3060 * future associations inheriting the socket value.
3062 static int sctp_setsockopt_maxburst(struct sock *sk,
3063 char __user *optval,
3064 int optlen)
3066 struct sctp_assoc_value params;
3067 struct sctp_sock *sp;
3068 struct sctp_association *asoc;
3069 int val;
3070 int assoc_id = 0;
3072 if (optlen < sizeof(int))
3073 return -EINVAL;
3075 if (optlen == sizeof(int)) {
3076 printk(KERN_WARNING
3077 "SCTP: Use of int in max_burst socket option deprecated\n");
3078 printk(KERN_WARNING
3079 "SCTP: Use struct sctp_assoc_value instead\n");
3080 if (copy_from_user(&val, optval, optlen))
3081 return -EFAULT;
3082 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3083 if (copy_from_user(&params, optval, optlen))
3084 return -EFAULT;
3085 val = params.assoc_value;
3086 assoc_id = params.assoc_id;
3087 } else
3088 return -EINVAL;
3090 sp = sctp_sk(sk);
3092 if (assoc_id != 0) {
3093 asoc = sctp_id2assoc(sk, assoc_id);
3094 if (!asoc)
3095 return -EINVAL;
3096 asoc->max_burst = val;
3097 } else
3098 sp->max_burst = val;
3100 return 0;
3104 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3106 * This set option adds a chunk type that the user is requesting to be
3107 * received only in an authenticated way. Changes to the list of chunks
3108 * will only effect future associations on the socket.
3110 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3111 char __user *optval,
3112 int optlen)
3114 struct sctp_authchunk val;
3116 if (!sctp_auth_enable)
3117 return -EACCES;
3119 if (optlen != sizeof(struct sctp_authchunk))
3120 return -EINVAL;
3121 if (copy_from_user(&val, optval, optlen))
3122 return -EFAULT;
3124 switch (val.sauth_chunk) {
3125 case SCTP_CID_INIT:
3126 case SCTP_CID_INIT_ACK:
3127 case SCTP_CID_SHUTDOWN_COMPLETE:
3128 case SCTP_CID_AUTH:
3129 return -EINVAL;
3132 /* add this chunk id to the endpoint */
3133 return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3137 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3139 * This option gets or sets the list of HMAC algorithms that the local
3140 * endpoint requires the peer to use.
3142 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3143 char __user *optval,
3144 int optlen)
3146 struct sctp_hmacalgo *hmacs;
3147 u32 idents;
3148 int err;
3150 if (!sctp_auth_enable)
3151 return -EACCES;
3153 if (optlen < sizeof(struct sctp_hmacalgo))
3154 return -EINVAL;
3156 hmacs = kmalloc(optlen, GFP_KERNEL);
3157 if (!hmacs)
3158 return -ENOMEM;
3160 if (copy_from_user(hmacs, optval, optlen)) {
3161 err = -EFAULT;
3162 goto out;
3165 idents = hmacs->shmac_num_idents;
3166 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3167 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3168 err = -EINVAL;
3169 goto out;
3172 err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3173 out:
3174 kfree(hmacs);
3175 return err;
3179 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3181 * This option will set a shared secret key which is used to build an
3182 * association shared key.
3184 static int sctp_setsockopt_auth_key(struct sock *sk,
3185 char __user *optval,
3186 int optlen)
3188 struct sctp_authkey *authkey;
3189 struct sctp_association *asoc;
3190 int ret;
3192 if (!sctp_auth_enable)
3193 return -EACCES;
3195 if (optlen <= sizeof(struct sctp_authkey))
3196 return -EINVAL;
3198 authkey = kmalloc(optlen, GFP_KERNEL);
3199 if (!authkey)
3200 return -ENOMEM;
3202 if (copy_from_user(authkey, optval, optlen)) {
3203 ret = -EFAULT;
3204 goto out;
3207 if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3208 ret = -EINVAL;
3209 goto out;
3212 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3213 if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3214 ret = -EINVAL;
3215 goto out;
3218 ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3219 out:
3220 kfree(authkey);
3221 return ret;
3225 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3227 * This option will get or set the active shared key to be used to build
3228 * the association shared key.
3230 static int sctp_setsockopt_active_key(struct sock *sk,
3231 char __user *optval,
3232 int optlen)
3234 struct sctp_authkeyid val;
3235 struct sctp_association *asoc;
3237 if (!sctp_auth_enable)
3238 return -EACCES;
3240 if (optlen != sizeof(struct sctp_authkeyid))
3241 return -EINVAL;
3242 if (copy_from_user(&val, optval, optlen))
3243 return -EFAULT;
3245 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3246 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3247 return -EINVAL;
3249 return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3250 val.scact_keynumber);
3254 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3256 * This set option will delete a shared secret key from use.
3258 static int sctp_setsockopt_del_key(struct sock *sk,
3259 char __user *optval,
3260 int optlen)
3262 struct sctp_authkeyid val;
3263 struct sctp_association *asoc;
3265 if (!sctp_auth_enable)
3266 return -EACCES;
3268 if (optlen != sizeof(struct sctp_authkeyid))
3269 return -EINVAL;
3270 if (copy_from_user(&val, optval, optlen))
3271 return -EFAULT;
3273 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3274 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3275 return -EINVAL;
3277 return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3278 val.scact_keynumber);
3283 /* API 6.2 setsockopt(), getsockopt()
3285 * Applications use setsockopt() and getsockopt() to set or retrieve
3286 * socket options. Socket options are used to change the default
3287 * behavior of sockets calls. They are described in Section 7.
3289 * The syntax is:
3291 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
3292 * int __user *optlen);
3293 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3294 * int optlen);
3296 * sd - the socket descript.
3297 * level - set to IPPROTO_SCTP for all SCTP options.
3298 * optname - the option name.
3299 * optval - the buffer to store the value of the option.
3300 * optlen - the size of the buffer.
3302 SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3303 char __user *optval, int optlen)
3305 int retval = 0;
3307 SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3308 sk, optname);
3310 /* I can hardly begin to describe how wrong this is. This is
3311 * so broken as to be worse than useless. The API draft
3312 * REALLY is NOT helpful here... I am not convinced that the
3313 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3314 * are at all well-founded.
3316 if (level != SOL_SCTP) {
3317 struct sctp_af *af = sctp_sk(sk)->pf->af;
3318 retval = af->setsockopt(sk, level, optname, optval, optlen);
3319 goto out_nounlock;
3322 sctp_lock_sock(sk);
3324 switch (optname) {
3325 case SCTP_SOCKOPT_BINDX_ADD:
3326 /* 'optlen' is the size of the addresses buffer. */
3327 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3328 optlen, SCTP_BINDX_ADD_ADDR);
3329 break;
3331 case SCTP_SOCKOPT_BINDX_REM:
3332 /* 'optlen' is the size of the addresses buffer. */
3333 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3334 optlen, SCTP_BINDX_REM_ADDR);
3335 break;
3337 case SCTP_SOCKOPT_CONNECTX_OLD:
3338 /* 'optlen' is the size of the addresses buffer. */
3339 retval = sctp_setsockopt_connectx_old(sk,
3340 (struct sockaddr __user *)optval,
3341 optlen);
3342 break;
3344 case SCTP_SOCKOPT_CONNECTX:
3345 /* 'optlen' is the size of the addresses buffer. */
3346 retval = sctp_setsockopt_connectx(sk,
3347 (struct sockaddr __user *)optval,
3348 optlen);
3349 break;
3351 case SCTP_DISABLE_FRAGMENTS:
3352 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3353 break;
3355 case SCTP_EVENTS:
3356 retval = sctp_setsockopt_events(sk, optval, optlen);
3357 break;
3359 case SCTP_AUTOCLOSE:
3360 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3361 break;
3363 case SCTP_PEER_ADDR_PARAMS:
3364 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3365 break;
3367 case SCTP_DELAYED_ACK:
3368 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3369 break;
3370 case SCTP_PARTIAL_DELIVERY_POINT:
3371 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3372 break;
3374 case SCTP_INITMSG:
3375 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3376 break;
3377 case SCTP_DEFAULT_SEND_PARAM:
3378 retval = sctp_setsockopt_default_send_param(sk, optval,
3379 optlen);
3380 break;
3381 case SCTP_PRIMARY_ADDR:
3382 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3383 break;
3384 case SCTP_SET_PEER_PRIMARY_ADDR:
3385 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3386 break;
3387 case SCTP_NODELAY:
3388 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3389 break;
3390 case SCTP_RTOINFO:
3391 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3392 break;
3393 case SCTP_ASSOCINFO:
3394 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3395 break;
3396 case SCTP_I_WANT_MAPPED_V4_ADDR:
3397 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3398 break;
3399 case SCTP_MAXSEG:
3400 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3401 break;
3402 case SCTP_ADAPTATION_LAYER:
3403 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3404 break;
3405 case SCTP_CONTEXT:
3406 retval = sctp_setsockopt_context(sk, optval, optlen);
3407 break;
3408 case SCTP_FRAGMENT_INTERLEAVE:
3409 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3410 break;
3411 case SCTP_MAX_BURST:
3412 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3413 break;
3414 case SCTP_AUTH_CHUNK:
3415 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3416 break;
3417 case SCTP_HMAC_IDENT:
3418 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3419 break;
3420 case SCTP_AUTH_KEY:
3421 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3422 break;
3423 case SCTP_AUTH_ACTIVE_KEY:
3424 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3425 break;
3426 case SCTP_AUTH_DELETE_KEY:
3427 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3428 break;
3429 default:
3430 retval = -ENOPROTOOPT;
3431 break;
3434 sctp_release_sock(sk);
3436 out_nounlock:
3437 return retval;
3440 /* API 3.1.6 connect() - UDP Style Syntax
3442 * An application may use the connect() call in the UDP model to initiate an
3443 * association without sending data.
3445 * The syntax is:
3447 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3449 * sd: the socket descriptor to have a new association added to.
3451 * nam: the address structure (either struct sockaddr_in or struct
3452 * sockaddr_in6 defined in RFC2553 [7]).
3454 * len: the size of the address.
3456 SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3457 int addr_len)
3459 int err = 0;
3460 struct sctp_af *af;
3462 sctp_lock_sock(sk);
3464 SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3465 __func__, sk, addr, addr_len);
3467 /* Validate addr_len before calling common connect/connectx routine. */
3468 af = sctp_get_af_specific(addr->sa_family);
3469 if (!af || addr_len < af->sockaddr_len) {
3470 err = -EINVAL;
3471 } else {
3472 /* Pass correct addr len to common routine (so it knows there
3473 * is only one address being passed.
3475 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3478 sctp_release_sock(sk);
3479 return err;
3482 /* FIXME: Write comments. */
3483 SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3485 return -EOPNOTSUPP; /* STUB */
3488 /* 4.1.4 accept() - TCP Style Syntax
3490 * Applications use accept() call to remove an established SCTP
3491 * association from the accept queue of the endpoint. A new socket
3492 * descriptor will be returned from accept() to represent the newly
3493 * formed association.
3495 SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3497 struct sctp_sock *sp;
3498 struct sctp_endpoint *ep;
3499 struct sock *newsk = NULL;
3500 struct sctp_association *asoc;
3501 long timeo;
3502 int error = 0;
3504 sctp_lock_sock(sk);
3506 sp = sctp_sk(sk);
3507 ep = sp->ep;
3509 if (!sctp_style(sk, TCP)) {
3510 error = -EOPNOTSUPP;
3511 goto out;
3514 if (!sctp_sstate(sk, LISTENING)) {
3515 error = -EINVAL;
3516 goto out;
3519 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3521 error = sctp_wait_for_accept(sk, timeo);
3522 if (error)
3523 goto out;
3525 /* We treat the list of associations on the endpoint as the accept
3526 * queue and pick the first association on the list.
3528 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3530 newsk = sp->pf->create_accept_sk(sk, asoc);
3531 if (!newsk) {
3532 error = -ENOMEM;
3533 goto out;
3536 /* Populate the fields of the newsk from the oldsk and migrate the
3537 * asoc to the newsk.
3539 sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3541 out:
3542 sctp_release_sock(sk);
3543 *err = error;
3544 return newsk;
3547 /* The SCTP ioctl handler. */
3548 SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3550 return -ENOIOCTLCMD;
3553 /* This is the function which gets called during socket creation to
3554 * initialized the SCTP-specific portion of the sock.
3555 * The sock structure should already be zero-filled memory.
3557 SCTP_STATIC int sctp_init_sock(struct sock *sk)
3559 struct sctp_endpoint *ep;
3560 struct sctp_sock *sp;
3562 SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3564 sp = sctp_sk(sk);
3566 /* Initialize the SCTP per socket area. */
3567 switch (sk->sk_type) {
3568 case SOCK_SEQPACKET:
3569 sp->type = SCTP_SOCKET_UDP;
3570 break;
3571 case SOCK_STREAM:
3572 sp->type = SCTP_SOCKET_TCP;
3573 break;
3574 default:
3575 return -ESOCKTNOSUPPORT;
3578 /* Initialize default send parameters. These parameters can be
3579 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3581 sp->default_stream = 0;
3582 sp->default_ppid = 0;
3583 sp->default_flags = 0;
3584 sp->default_context = 0;
3585 sp->default_timetolive = 0;
3587 sp->default_rcv_context = 0;
3588 sp->max_burst = sctp_max_burst;
3590 /* Initialize default setup parameters. These parameters
3591 * can be modified with the SCTP_INITMSG socket option or
3592 * overridden by the SCTP_INIT CMSG.
3594 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
3595 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
3596 sp->initmsg.sinit_max_attempts = sctp_max_retrans_init;
3597 sp->initmsg.sinit_max_init_timeo = sctp_rto_max;
3599 /* Initialize default RTO related parameters. These parameters can
3600 * be modified for with the SCTP_RTOINFO socket option.
3602 sp->rtoinfo.srto_initial = sctp_rto_initial;
3603 sp->rtoinfo.srto_max = sctp_rto_max;
3604 sp->rtoinfo.srto_min = sctp_rto_min;
3606 /* Initialize default association related parameters. These parameters
3607 * can be modified with the SCTP_ASSOCINFO socket option.
3609 sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association;
3610 sp->assocparams.sasoc_number_peer_destinations = 0;
3611 sp->assocparams.sasoc_peer_rwnd = 0;
3612 sp->assocparams.sasoc_local_rwnd = 0;
3613 sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life;
3615 /* Initialize default event subscriptions. By default, all the
3616 * options are off.
3618 memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3620 /* Default Peer Address Parameters. These defaults can
3621 * be modified via SCTP_PEER_ADDR_PARAMS
3623 sp->hbinterval = sctp_hb_interval;
3624 sp->pathmaxrxt = sctp_max_retrans_path;
3625 sp->pathmtu = 0; // allow default discovery
3626 sp->sackdelay = sctp_sack_timeout;
3627 sp->sackfreq = 2;
3628 sp->param_flags = SPP_HB_ENABLE |
3629 SPP_PMTUD_ENABLE |
3630 SPP_SACKDELAY_ENABLE;
3632 /* If enabled no SCTP message fragmentation will be performed.
3633 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3635 sp->disable_fragments = 0;
3637 /* Enable Nagle algorithm by default. */
3638 sp->nodelay = 0;
3640 /* Enable by default. */
3641 sp->v4mapped = 1;
3643 /* Auto-close idle associations after the configured
3644 * number of seconds. A value of 0 disables this
3645 * feature. Configure through the SCTP_AUTOCLOSE socket option,
3646 * for UDP-style sockets only.
3648 sp->autoclose = 0;
3650 /* User specified fragmentation limit. */
3651 sp->user_frag = 0;
3653 sp->adaptation_ind = 0;
3655 sp->pf = sctp_get_pf_specific(sk->sk_family);
3657 /* Control variables for partial data delivery. */
3658 atomic_set(&sp->pd_mode, 0);
3659 skb_queue_head_init(&sp->pd_lobby);
3660 sp->frag_interleave = 0;
3662 /* Create a per socket endpoint structure. Even if we
3663 * change the data structure relationships, this may still
3664 * be useful for storing pre-connect address information.
3666 ep = sctp_endpoint_new(sk, GFP_KERNEL);
3667 if (!ep)
3668 return -ENOMEM;
3670 sp->ep = ep;
3671 sp->hmac = NULL;
3673 SCTP_DBG_OBJCNT_INC(sock);
3674 percpu_counter_inc(&sctp_sockets_allocated);
3676 local_bh_disable();
3677 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
3678 local_bh_enable();
3680 return 0;
3683 /* Cleanup any SCTP per socket resources. */
3684 SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3686 struct sctp_endpoint *ep;
3688 SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3690 /* Release our hold on the endpoint. */
3691 ep = sctp_sk(sk)->ep;
3692 sctp_endpoint_free(ep);
3693 percpu_counter_dec(&sctp_sockets_allocated);
3694 local_bh_disable();
3695 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
3696 local_bh_enable();
3699 /* API 4.1.7 shutdown() - TCP Style Syntax
3700 * int shutdown(int socket, int how);
3702 * sd - the socket descriptor of the association to be closed.
3703 * how - Specifies the type of shutdown. The values are
3704 * as follows:
3705 * SHUT_RD
3706 * Disables further receive operations. No SCTP
3707 * protocol action is taken.
3708 * SHUT_WR
3709 * Disables further send operations, and initiates
3710 * the SCTP shutdown sequence.
3711 * SHUT_RDWR
3712 * Disables further send and receive operations
3713 * and initiates the SCTP shutdown sequence.
3715 SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
3717 struct sctp_endpoint *ep;
3718 struct sctp_association *asoc;
3720 if (!sctp_style(sk, TCP))
3721 return;
3723 if (how & SEND_SHUTDOWN) {
3724 ep = sctp_sk(sk)->ep;
3725 if (!list_empty(&ep->asocs)) {
3726 asoc = list_entry(ep->asocs.next,
3727 struct sctp_association, asocs);
3728 sctp_primitive_SHUTDOWN(asoc, NULL);
3733 /* 7.2.1 Association Status (SCTP_STATUS)
3735 * Applications can retrieve current status information about an
3736 * association, including association state, peer receiver window size,
3737 * number of unacked data chunks, and number of data chunks pending
3738 * receipt. This information is read-only.
3740 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
3741 char __user *optval,
3742 int __user *optlen)
3744 struct sctp_status status;
3745 struct sctp_association *asoc = NULL;
3746 struct sctp_transport *transport;
3747 sctp_assoc_t associd;
3748 int retval = 0;
3750 if (len < sizeof(status)) {
3751 retval = -EINVAL;
3752 goto out;
3755 len = sizeof(status);
3756 if (copy_from_user(&status, optval, len)) {
3757 retval = -EFAULT;
3758 goto out;
3761 associd = status.sstat_assoc_id;
3762 asoc = sctp_id2assoc(sk, associd);
3763 if (!asoc) {
3764 retval = -EINVAL;
3765 goto out;
3768 transport = asoc->peer.primary_path;
3770 status.sstat_assoc_id = sctp_assoc2id(asoc);
3771 status.sstat_state = asoc->state;
3772 status.sstat_rwnd = asoc->peer.rwnd;
3773 status.sstat_unackdata = asoc->unack_data;
3775 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
3776 status.sstat_instrms = asoc->c.sinit_max_instreams;
3777 status.sstat_outstrms = asoc->c.sinit_num_ostreams;
3778 status.sstat_fragmentation_point = asoc->frag_point;
3779 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3780 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
3781 transport->af_specific->sockaddr_len);
3782 /* Map ipv4 address into v4-mapped-on-v6 address. */
3783 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
3784 (union sctp_addr *)&status.sstat_primary.spinfo_address);
3785 status.sstat_primary.spinfo_state = transport->state;
3786 status.sstat_primary.spinfo_cwnd = transport->cwnd;
3787 status.sstat_primary.spinfo_srtt = transport->srtt;
3788 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
3789 status.sstat_primary.spinfo_mtu = transport->pathmtu;
3791 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
3792 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
3794 if (put_user(len, optlen)) {
3795 retval = -EFAULT;
3796 goto out;
3799 SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
3800 len, status.sstat_state, status.sstat_rwnd,
3801 status.sstat_assoc_id);
3803 if (copy_to_user(optval, &status, len)) {
3804 retval = -EFAULT;
3805 goto out;
3808 out:
3809 return (retval);
3813 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
3815 * Applications can retrieve information about a specific peer address
3816 * of an association, including its reachability state, congestion
3817 * window, and retransmission timer values. This information is
3818 * read-only.
3820 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
3821 char __user *optval,
3822 int __user *optlen)
3824 struct sctp_paddrinfo pinfo;
3825 struct sctp_transport *transport;
3826 int retval = 0;
3828 if (len < sizeof(pinfo)) {
3829 retval = -EINVAL;
3830 goto out;
3833 len = sizeof(pinfo);
3834 if (copy_from_user(&pinfo, optval, len)) {
3835 retval = -EFAULT;
3836 goto out;
3839 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
3840 pinfo.spinfo_assoc_id);
3841 if (!transport)
3842 return -EINVAL;
3844 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
3845 pinfo.spinfo_state = transport->state;
3846 pinfo.spinfo_cwnd = transport->cwnd;
3847 pinfo.spinfo_srtt = transport->srtt;
3848 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
3849 pinfo.spinfo_mtu = transport->pathmtu;
3851 if (pinfo.spinfo_state == SCTP_UNKNOWN)
3852 pinfo.spinfo_state = SCTP_ACTIVE;
3854 if (put_user(len, optlen)) {
3855 retval = -EFAULT;
3856 goto out;
3859 if (copy_to_user(optval, &pinfo, len)) {
3860 retval = -EFAULT;
3861 goto out;
3864 out:
3865 return (retval);
3868 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
3870 * This option is a on/off flag. If enabled no SCTP message
3871 * fragmentation will be performed. Instead if a message being sent
3872 * exceeds the current PMTU size, the message will NOT be sent and
3873 * instead a error will be indicated to the user.
3875 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
3876 char __user *optval, int __user *optlen)
3878 int val;
3880 if (len < sizeof(int))
3881 return -EINVAL;
3883 len = sizeof(int);
3884 val = (sctp_sk(sk)->disable_fragments == 1);
3885 if (put_user(len, optlen))
3886 return -EFAULT;
3887 if (copy_to_user(optval, &val, len))
3888 return -EFAULT;
3889 return 0;
3892 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
3894 * This socket option is used to specify various notifications and
3895 * ancillary data the user wishes to receive.
3897 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
3898 int __user *optlen)
3900 if (len < sizeof(struct sctp_event_subscribe))
3901 return -EINVAL;
3902 len = sizeof(struct sctp_event_subscribe);
3903 if (put_user(len, optlen))
3904 return -EFAULT;
3905 if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
3906 return -EFAULT;
3907 return 0;
3910 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
3912 * This socket option is applicable to the UDP-style socket only. When
3913 * set it will cause associations that are idle for more than the
3914 * specified number of seconds to automatically close. An association
3915 * being idle is defined an association that has NOT sent or received
3916 * user data. The special value of '0' indicates that no automatic
3917 * close of any associations should be performed. The option expects an
3918 * integer defining the number of seconds of idle time before an
3919 * association is closed.
3921 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
3923 /* Applicable to UDP-style socket only */
3924 if (sctp_style(sk, TCP))
3925 return -EOPNOTSUPP;
3926 if (len < sizeof(int))
3927 return -EINVAL;
3928 len = sizeof(int);
3929 if (put_user(len, optlen))
3930 return -EFAULT;
3931 if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
3932 return -EFAULT;
3933 return 0;
3936 /* Helper routine to branch off an association to a new socket. */
3937 SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc,
3938 struct socket **sockp)
3940 struct sock *sk = asoc->base.sk;
3941 struct socket *sock;
3942 struct inet_sock *inetsk;
3943 struct sctp_af *af;
3944 int err = 0;
3946 /* An association cannot be branched off from an already peeled-off
3947 * socket, nor is this supported for tcp style sockets.
3949 if (!sctp_style(sk, UDP))
3950 return -EINVAL;
3952 /* Create a new socket. */
3953 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
3954 if (err < 0)
3955 return err;
3957 /* Populate the fields of the newsk from the oldsk and migrate the
3958 * asoc to the newsk.
3960 sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
3962 /* Make peeled-off sockets more like 1-1 accepted sockets.
3963 * Set the daddr and initialize id to something more random
3965 af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
3966 af->to_sk_daddr(&asoc->peer.primary_addr, sk);
3967 inetsk = inet_sk(sock->sk);
3968 inetsk->id = asoc->next_tsn ^ jiffies;
3970 *sockp = sock;
3972 return err;
3975 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
3977 sctp_peeloff_arg_t peeloff;
3978 struct socket *newsock;
3979 int retval = 0;
3980 struct sctp_association *asoc;
3982 if (len < sizeof(sctp_peeloff_arg_t))
3983 return -EINVAL;
3984 len = sizeof(sctp_peeloff_arg_t);
3985 if (copy_from_user(&peeloff, optval, len))
3986 return -EFAULT;
3988 asoc = sctp_id2assoc(sk, peeloff.associd);
3989 if (!asoc) {
3990 retval = -EINVAL;
3991 goto out;
3994 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc);
3996 retval = sctp_do_peeloff(asoc, &newsock);
3997 if (retval < 0)
3998 goto out;
4000 /* Map the socket to an unused fd that can be returned to the user. */
4001 retval = sock_map_fd(newsock, 0);
4002 if (retval < 0) {
4003 sock_release(newsock);
4004 goto out;
4007 SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n",
4008 __func__, sk, asoc, newsock->sk, retval);
4010 /* Return the fd mapped to the new socket. */
4011 peeloff.sd = retval;
4012 if (put_user(len, optlen))
4013 return -EFAULT;
4014 if (copy_to_user(optval, &peeloff, len))
4015 retval = -EFAULT;
4017 out:
4018 return retval;
4021 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4023 * Applications can enable or disable heartbeats for any peer address of
4024 * an association, modify an address's heartbeat interval, force a
4025 * heartbeat to be sent immediately, and adjust the address's maximum
4026 * number of retransmissions sent before an address is considered
4027 * unreachable. The following structure is used to access and modify an
4028 * address's parameters:
4030 * struct sctp_paddrparams {
4031 * sctp_assoc_t spp_assoc_id;
4032 * struct sockaddr_storage spp_address;
4033 * uint32_t spp_hbinterval;
4034 * uint16_t spp_pathmaxrxt;
4035 * uint32_t spp_pathmtu;
4036 * uint32_t spp_sackdelay;
4037 * uint32_t spp_flags;
4038 * };
4040 * spp_assoc_id - (one-to-many style socket) This is filled in the
4041 * application, and identifies the association for
4042 * this query.
4043 * spp_address - This specifies which address is of interest.
4044 * spp_hbinterval - This contains the value of the heartbeat interval,
4045 * in milliseconds. If a value of zero
4046 * is present in this field then no changes are to
4047 * be made to this parameter.
4048 * spp_pathmaxrxt - This contains the maximum number of
4049 * retransmissions before this address shall be
4050 * considered unreachable. If a value of zero
4051 * is present in this field then no changes are to
4052 * be made to this parameter.
4053 * spp_pathmtu - When Path MTU discovery is disabled the value
4054 * specified here will be the "fixed" path mtu.
4055 * Note that if the spp_address field is empty
4056 * then all associations on this address will
4057 * have this fixed path mtu set upon them.
4059 * spp_sackdelay - When delayed sack is enabled, this value specifies
4060 * the number of milliseconds that sacks will be delayed
4061 * for. This value will apply to all addresses of an
4062 * association if the spp_address field is empty. Note
4063 * also, that if delayed sack is enabled and this
4064 * value is set to 0, no change is made to the last
4065 * recorded delayed sack timer value.
4067 * spp_flags - These flags are used to control various features
4068 * on an association. The flag field may contain
4069 * zero or more of the following options.
4071 * SPP_HB_ENABLE - Enable heartbeats on the
4072 * specified address. Note that if the address
4073 * field is empty all addresses for the association
4074 * have heartbeats enabled upon them.
4076 * SPP_HB_DISABLE - Disable heartbeats on the
4077 * speicifed address. Note that if the address
4078 * field is empty all addresses for the association
4079 * will have their heartbeats disabled. Note also
4080 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
4081 * mutually exclusive, only one of these two should
4082 * be specified. Enabling both fields will have
4083 * undetermined results.
4085 * SPP_HB_DEMAND - Request a user initiated heartbeat
4086 * to be made immediately.
4088 * SPP_PMTUD_ENABLE - This field will enable PMTU
4089 * discovery upon the specified address. Note that
4090 * if the address feild is empty then all addresses
4091 * on the association are effected.
4093 * SPP_PMTUD_DISABLE - This field will disable PMTU
4094 * discovery upon the specified address. Note that
4095 * if the address feild is empty then all addresses
4096 * on the association are effected. Not also that
4097 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4098 * exclusive. Enabling both will have undetermined
4099 * results.
4101 * SPP_SACKDELAY_ENABLE - Setting this flag turns
4102 * on delayed sack. The time specified in spp_sackdelay
4103 * is used to specify the sack delay for this address. Note
4104 * that if spp_address is empty then all addresses will
4105 * enable delayed sack and take on the sack delay
4106 * value specified in spp_sackdelay.
4107 * SPP_SACKDELAY_DISABLE - Setting this flag turns
4108 * off delayed sack. If the spp_address field is blank then
4109 * delayed sack is disabled for the entire association. Note
4110 * also that this field is mutually exclusive to
4111 * SPP_SACKDELAY_ENABLE, setting both will have undefined
4112 * results.
4114 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4115 char __user *optval, int __user *optlen)
4117 struct sctp_paddrparams params;
4118 struct sctp_transport *trans = NULL;
4119 struct sctp_association *asoc = NULL;
4120 struct sctp_sock *sp = sctp_sk(sk);
4122 if (len < sizeof(struct sctp_paddrparams))
4123 return -EINVAL;
4124 len = sizeof(struct sctp_paddrparams);
4125 if (copy_from_user(&params, optval, len))
4126 return -EFAULT;
4128 /* If an address other than INADDR_ANY is specified, and
4129 * no transport is found, then the request is invalid.
4131 if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
4132 trans = sctp_addr_id2transport(sk, &params.spp_address,
4133 params.spp_assoc_id);
4134 if (!trans) {
4135 SCTP_DEBUG_PRINTK("Failed no transport\n");
4136 return -EINVAL;
4140 /* Get association, if assoc_id != 0 and the socket is a one
4141 * to many style socket, and an association was not found, then
4142 * the id was invalid.
4144 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4145 if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4146 SCTP_DEBUG_PRINTK("Failed no association\n");
4147 return -EINVAL;
4150 if (trans) {
4151 /* Fetch transport values. */
4152 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4153 params.spp_pathmtu = trans->pathmtu;
4154 params.spp_pathmaxrxt = trans->pathmaxrxt;
4155 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
4157 /*draft-11 doesn't say what to return in spp_flags*/
4158 params.spp_flags = trans->param_flags;
4159 } else if (asoc) {
4160 /* Fetch association values. */
4161 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4162 params.spp_pathmtu = asoc->pathmtu;
4163 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4164 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
4166 /*draft-11 doesn't say what to return in spp_flags*/
4167 params.spp_flags = asoc->param_flags;
4168 } else {
4169 /* Fetch socket values. */
4170 params.spp_hbinterval = sp->hbinterval;
4171 params.spp_pathmtu = sp->pathmtu;
4172 params.spp_sackdelay = sp->sackdelay;
4173 params.spp_pathmaxrxt = sp->pathmaxrxt;
4175 /*draft-11 doesn't say what to return in spp_flags*/
4176 params.spp_flags = sp->param_flags;
4179 if (copy_to_user(optval, &params, len))
4180 return -EFAULT;
4182 if (put_user(len, optlen))
4183 return -EFAULT;
4185 return 0;
4189 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
4191 * This option will effect the way delayed acks are performed. This
4192 * option allows you to get or set the delayed ack time, in
4193 * milliseconds. It also allows changing the delayed ack frequency.
4194 * Changing the frequency to 1 disables the delayed sack algorithm. If
4195 * the assoc_id is 0, then this sets or gets the endpoints default
4196 * values. If the assoc_id field is non-zero, then the set or get
4197 * effects the specified association for the one to many model (the
4198 * assoc_id field is ignored by the one to one model). Note that if
4199 * sack_delay or sack_freq are 0 when setting this option, then the
4200 * current values will remain unchanged.
4202 * struct sctp_sack_info {
4203 * sctp_assoc_t sack_assoc_id;
4204 * uint32_t sack_delay;
4205 * uint32_t sack_freq;
4206 * };
4208 * sack_assoc_id - This parameter, indicates which association the user
4209 * is performing an action upon. Note that if this field's value is
4210 * zero then the endpoints default value is changed (effecting future
4211 * associations only).
4213 * sack_delay - This parameter contains the number of milliseconds that
4214 * the user is requesting the delayed ACK timer be set to. Note that
4215 * this value is defined in the standard to be between 200 and 500
4216 * milliseconds.
4218 * sack_freq - This parameter contains the number of packets that must
4219 * be received before a sack is sent without waiting for the delay
4220 * timer to expire. The default value for this is 2, setting this
4221 * value to 1 will disable the delayed sack algorithm.
4223 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4224 char __user *optval,
4225 int __user *optlen)
4227 struct sctp_sack_info params;
4228 struct sctp_association *asoc = NULL;
4229 struct sctp_sock *sp = sctp_sk(sk);
4231 if (len >= sizeof(struct sctp_sack_info)) {
4232 len = sizeof(struct sctp_sack_info);
4234 if (copy_from_user(&params, optval, len))
4235 return -EFAULT;
4236 } else if (len == sizeof(struct sctp_assoc_value)) {
4237 printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value "
4238 "in delayed_ack socket option deprecated\n");
4239 printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n");
4240 if (copy_from_user(&params, optval, len))
4241 return -EFAULT;
4242 } else
4243 return - EINVAL;
4245 /* Get association, if sack_assoc_id != 0 and the socket is a one
4246 * to many style socket, and an association was not found, then
4247 * the id was invalid.
4249 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4250 if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4251 return -EINVAL;
4253 if (asoc) {
4254 /* Fetch association values. */
4255 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4256 params.sack_delay = jiffies_to_msecs(
4257 asoc->sackdelay);
4258 params.sack_freq = asoc->sackfreq;
4260 } else {
4261 params.sack_delay = 0;
4262 params.sack_freq = 1;
4264 } else {
4265 /* Fetch socket values. */
4266 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4267 params.sack_delay = sp->sackdelay;
4268 params.sack_freq = sp->sackfreq;
4269 } else {
4270 params.sack_delay = 0;
4271 params.sack_freq = 1;
4275 if (copy_to_user(optval, &params, len))
4276 return -EFAULT;
4278 if (put_user(len, optlen))
4279 return -EFAULT;
4281 return 0;
4284 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4286 * Applications can specify protocol parameters for the default association
4287 * initialization. The option name argument to setsockopt() and getsockopt()
4288 * is SCTP_INITMSG.
4290 * Setting initialization parameters is effective only on an unconnected
4291 * socket (for UDP-style sockets only future associations are effected
4292 * by the change). With TCP-style sockets, this option is inherited by
4293 * sockets derived from a listener socket.
4295 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4297 if (len < sizeof(struct sctp_initmsg))
4298 return -EINVAL;
4299 len = sizeof(struct sctp_initmsg);
4300 if (put_user(len, optlen))
4301 return -EFAULT;
4302 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4303 return -EFAULT;
4304 return 0;
4307 static int sctp_getsockopt_peer_addrs_num_old(struct sock *sk, int len,
4308 char __user *optval,
4309 int __user *optlen)
4311 sctp_assoc_t id;
4312 struct sctp_association *asoc;
4313 struct list_head *pos;
4314 int cnt = 0;
4316 if (len < sizeof(sctp_assoc_t))
4317 return -EINVAL;
4319 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4320 return -EFAULT;
4322 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_NUM_OLD "
4323 "socket option deprecated\n");
4324 /* For UDP-style sockets, id specifies the association to query. */
4325 asoc = sctp_id2assoc(sk, id);
4326 if (!asoc)
4327 return -EINVAL;
4329 list_for_each(pos, &asoc->peer.transport_addr_list) {
4330 cnt ++;
4333 return cnt;
4337 * Old API for getting list of peer addresses. Does not work for 32-bit
4338 * programs running on a 64-bit kernel
4340 static int sctp_getsockopt_peer_addrs_old(struct sock *sk, int len,
4341 char __user *optval,
4342 int __user *optlen)
4344 struct sctp_association *asoc;
4345 int cnt = 0;
4346 struct sctp_getaddrs_old getaddrs;
4347 struct sctp_transport *from;
4348 void __user *to;
4349 union sctp_addr temp;
4350 struct sctp_sock *sp = sctp_sk(sk);
4351 int addrlen;
4353 if (len < sizeof(struct sctp_getaddrs_old))
4354 return -EINVAL;
4356 len = sizeof(struct sctp_getaddrs_old);
4358 if (copy_from_user(&getaddrs, optval, len))
4359 return -EFAULT;
4361 if (getaddrs.addr_num <= 0) return -EINVAL;
4363 printk(KERN_WARNING "SCTP: Use of SCTP_GET_PEER_ADDRS_OLD "
4364 "socket option deprecated\n");
4366 /* For UDP-style sockets, id specifies the association to query. */
4367 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4368 if (!asoc)
4369 return -EINVAL;
4371 to = (void __user *)getaddrs.addrs;
4372 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4373 transports) {
4374 memcpy(&temp, &from->ipaddr, sizeof(temp));
4375 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4376 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4377 if (copy_to_user(to, &temp, addrlen))
4378 return -EFAULT;
4379 to += addrlen ;
4380 cnt ++;
4381 if (cnt >= getaddrs.addr_num) break;
4383 getaddrs.addr_num = cnt;
4384 if (put_user(len, optlen))
4385 return -EFAULT;
4386 if (copy_to_user(optval, &getaddrs, len))
4387 return -EFAULT;
4389 return 0;
4392 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4393 char __user *optval, int __user *optlen)
4395 struct sctp_association *asoc;
4396 int cnt = 0;
4397 struct sctp_getaddrs getaddrs;
4398 struct sctp_transport *from;
4399 void __user *to;
4400 union sctp_addr temp;
4401 struct sctp_sock *sp = sctp_sk(sk);
4402 int addrlen;
4403 size_t space_left;
4404 int bytes_copied;
4406 if (len < sizeof(struct sctp_getaddrs))
4407 return -EINVAL;
4409 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4410 return -EFAULT;
4412 /* For UDP-style sockets, id specifies the association to query. */
4413 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4414 if (!asoc)
4415 return -EINVAL;
4417 to = optval + offsetof(struct sctp_getaddrs,addrs);
4418 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4420 list_for_each_entry(from, &asoc->peer.transport_addr_list,
4421 transports) {
4422 memcpy(&temp, &from->ipaddr, sizeof(temp));
4423 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4424 addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len;
4425 if (space_left < addrlen)
4426 return -ENOMEM;
4427 if (copy_to_user(to, &temp, addrlen))
4428 return -EFAULT;
4429 to += addrlen;
4430 cnt++;
4431 space_left -= addrlen;
4434 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4435 return -EFAULT;
4436 bytes_copied = ((char __user *)to) - optval;
4437 if (put_user(bytes_copied, optlen))
4438 return -EFAULT;
4440 return 0;
4443 static int sctp_getsockopt_local_addrs_num_old(struct sock *sk, int len,
4444 char __user *optval,
4445 int __user *optlen)
4447 sctp_assoc_t id;
4448 struct sctp_bind_addr *bp;
4449 struct sctp_association *asoc;
4450 struct sctp_sockaddr_entry *addr;
4451 int cnt = 0;
4453 if (len < sizeof(sctp_assoc_t))
4454 return -EINVAL;
4456 if (copy_from_user(&id, optval, sizeof(sctp_assoc_t)))
4457 return -EFAULT;
4459 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_NUM_OLD "
4460 "socket option deprecated\n");
4463 * For UDP-style sockets, id specifies the association to query.
4464 * If the id field is set to the value '0' then the locally bound
4465 * addresses are returned without regard to any particular
4466 * association.
4468 if (0 == id) {
4469 bp = &sctp_sk(sk)->ep->base.bind_addr;
4470 } else {
4471 asoc = sctp_id2assoc(sk, id);
4472 if (!asoc)
4473 return -EINVAL;
4474 bp = &asoc->base.bind_addr;
4477 /* If the endpoint is bound to 0.0.0.0 or ::0, count the valid
4478 * addresses from the global local address list.
4480 if (sctp_list_single_entry(&bp->address_list)) {
4481 addr = list_entry(bp->address_list.next,
4482 struct sctp_sockaddr_entry, list);
4483 if (sctp_is_any(sk, &addr->a)) {
4484 rcu_read_lock();
4485 list_for_each_entry_rcu(addr,
4486 &sctp_local_addr_list, list) {
4487 if (!addr->valid)
4488 continue;
4490 if ((PF_INET == sk->sk_family) &&
4491 (AF_INET6 == addr->a.sa.sa_family))
4492 continue;
4494 if ((PF_INET6 == sk->sk_family) &&
4495 inet_v6_ipv6only(sk) &&
4496 (AF_INET == addr->a.sa.sa_family))
4497 continue;
4499 cnt++;
4501 rcu_read_unlock();
4502 } else {
4503 cnt = 1;
4505 goto done;
4508 /* Protection on the bound address list is not needed,
4509 * since in the socket option context we hold the socket lock,
4510 * so there is no way that the bound address list can change.
4512 list_for_each_entry(addr, &bp->address_list, list) {
4513 cnt ++;
4515 done:
4516 return cnt;
4519 /* Helper function that copies local addresses to user and returns the number
4520 * of addresses copied.
4522 static int sctp_copy_laddrs_old(struct sock *sk, __u16 port,
4523 int max_addrs, void *to,
4524 int *bytes_copied)
4526 struct sctp_sockaddr_entry *addr;
4527 union sctp_addr temp;
4528 int cnt = 0;
4529 int addrlen;
4531 rcu_read_lock();
4532 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4533 if (!addr->valid)
4534 continue;
4536 if ((PF_INET == sk->sk_family) &&
4537 (AF_INET6 == addr->a.sa.sa_family))
4538 continue;
4539 if ((PF_INET6 == sk->sk_family) &&
4540 inet_v6_ipv6only(sk) &&
4541 (AF_INET == addr->a.sa.sa_family))
4542 continue;
4543 memcpy(&temp, &addr->a, sizeof(temp));
4544 if (!temp.v4.sin_port)
4545 temp.v4.sin_port = htons(port);
4547 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4548 &temp);
4549 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4550 memcpy(to, &temp, addrlen);
4552 to += addrlen;
4553 *bytes_copied += addrlen;
4554 cnt ++;
4555 if (cnt >= max_addrs) break;
4557 rcu_read_unlock();
4559 return cnt;
4562 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4563 size_t space_left, int *bytes_copied)
4565 struct sctp_sockaddr_entry *addr;
4566 union sctp_addr temp;
4567 int cnt = 0;
4568 int addrlen;
4570 rcu_read_lock();
4571 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
4572 if (!addr->valid)
4573 continue;
4575 if ((PF_INET == sk->sk_family) &&
4576 (AF_INET6 == addr->a.sa.sa_family))
4577 continue;
4578 if ((PF_INET6 == sk->sk_family) &&
4579 inet_v6_ipv6only(sk) &&
4580 (AF_INET == addr->a.sa.sa_family))
4581 continue;
4582 memcpy(&temp, &addr->a, sizeof(temp));
4583 if (!temp.v4.sin_port)
4584 temp.v4.sin_port = htons(port);
4586 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4587 &temp);
4588 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4589 if (space_left < addrlen) {
4590 cnt = -ENOMEM;
4591 break;
4593 memcpy(to, &temp, addrlen);
4595 to += addrlen;
4596 cnt ++;
4597 space_left -= addrlen;
4598 *bytes_copied += addrlen;
4600 rcu_read_unlock();
4602 return cnt;
4605 /* Old API for getting list of local addresses. Does not work for 32-bit
4606 * programs running on a 64-bit kernel
4608 static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
4609 char __user *optval, int __user *optlen)
4611 struct sctp_bind_addr *bp;
4612 struct sctp_association *asoc;
4613 int cnt = 0;
4614 struct sctp_getaddrs_old getaddrs;
4615 struct sctp_sockaddr_entry *addr;
4616 void __user *to;
4617 union sctp_addr temp;
4618 struct sctp_sock *sp = sctp_sk(sk);
4619 int addrlen;
4620 int err = 0;
4621 void *addrs;
4622 void *buf;
4623 int bytes_copied = 0;
4625 if (len < sizeof(struct sctp_getaddrs_old))
4626 return -EINVAL;
4628 len = sizeof(struct sctp_getaddrs_old);
4629 if (copy_from_user(&getaddrs, optval, len))
4630 return -EFAULT;
4632 if (getaddrs.addr_num <= 0 ||
4633 getaddrs.addr_num >= (INT_MAX / sizeof(union sctp_addr)))
4634 return -EINVAL;
4636 printk(KERN_WARNING "SCTP: Use of SCTP_GET_LOCAL_ADDRS_OLD "
4637 "socket option deprecated\n");
4640 * For UDP-style sockets, id specifies the association to query.
4641 * If the id field is set to the value '0' then the locally bound
4642 * addresses are returned without regard to any particular
4643 * association.
4645 if (0 == getaddrs.assoc_id) {
4646 bp = &sctp_sk(sk)->ep->base.bind_addr;
4647 } else {
4648 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4649 if (!asoc)
4650 return -EINVAL;
4651 bp = &asoc->base.bind_addr;
4654 to = getaddrs.addrs;
4656 /* Allocate space for a local instance of packed array to hold all
4657 * the data. We store addresses here first and then put write them
4658 * to the user in one shot.
4660 addrs = kmalloc(sizeof(union sctp_addr) * getaddrs.addr_num,
4661 GFP_KERNEL);
4662 if (!addrs)
4663 return -ENOMEM;
4665 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4666 * addresses from the global local address list.
4668 if (sctp_list_single_entry(&bp->address_list)) {
4669 addr = list_entry(bp->address_list.next,
4670 struct sctp_sockaddr_entry, list);
4671 if (sctp_is_any(sk, &addr->a)) {
4672 cnt = sctp_copy_laddrs_old(sk, bp->port,
4673 getaddrs.addr_num,
4674 addrs, &bytes_copied);
4675 goto copy_getaddrs;
4679 buf = addrs;
4680 /* Protection on the bound address list is not needed since
4681 * in the socket option context we hold a socket lock and
4682 * thus the bound address list can't change.
4684 list_for_each_entry(addr, &bp->address_list, list) {
4685 memcpy(&temp, &addr->a, sizeof(temp));
4686 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4687 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4688 memcpy(buf, &temp, addrlen);
4689 buf += addrlen;
4690 bytes_copied += addrlen;
4691 cnt ++;
4692 if (cnt >= getaddrs.addr_num) break;
4695 copy_getaddrs:
4696 /* copy the entire address list into the user provided space */
4697 if (copy_to_user(to, addrs, bytes_copied)) {
4698 err = -EFAULT;
4699 goto error;
4702 /* copy the leading structure back to user */
4703 getaddrs.addr_num = cnt;
4704 if (copy_to_user(optval, &getaddrs, len))
4705 err = -EFAULT;
4707 error:
4708 kfree(addrs);
4709 return err;
4712 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4713 char __user *optval, int __user *optlen)
4715 struct sctp_bind_addr *bp;
4716 struct sctp_association *asoc;
4717 int cnt = 0;
4718 struct sctp_getaddrs getaddrs;
4719 struct sctp_sockaddr_entry *addr;
4720 void __user *to;
4721 union sctp_addr temp;
4722 struct sctp_sock *sp = sctp_sk(sk);
4723 int addrlen;
4724 int err = 0;
4725 size_t space_left;
4726 int bytes_copied = 0;
4727 void *addrs;
4728 void *buf;
4730 if (len < sizeof(struct sctp_getaddrs))
4731 return -EINVAL;
4733 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4734 return -EFAULT;
4737 * For UDP-style sockets, id specifies the association to query.
4738 * If the id field is set to the value '0' then the locally bound
4739 * addresses are returned without regard to any particular
4740 * association.
4742 if (0 == getaddrs.assoc_id) {
4743 bp = &sctp_sk(sk)->ep->base.bind_addr;
4744 } else {
4745 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4746 if (!asoc)
4747 return -EINVAL;
4748 bp = &asoc->base.bind_addr;
4751 to = optval + offsetof(struct sctp_getaddrs,addrs);
4752 space_left = len - offsetof(struct sctp_getaddrs,addrs);
4754 addrs = kmalloc(space_left, GFP_KERNEL);
4755 if (!addrs)
4756 return -ENOMEM;
4758 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4759 * addresses from the global local address list.
4761 if (sctp_list_single_entry(&bp->address_list)) {
4762 addr = list_entry(bp->address_list.next,
4763 struct sctp_sockaddr_entry, list);
4764 if (sctp_is_any(sk, &addr->a)) {
4765 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4766 space_left, &bytes_copied);
4767 if (cnt < 0) {
4768 err = cnt;
4769 goto out;
4771 goto copy_getaddrs;
4775 buf = addrs;
4776 /* Protection on the bound address list is not needed since
4777 * in the socket option context we hold a socket lock and
4778 * thus the bound address list can't change.
4780 list_for_each_entry(addr, &bp->address_list, list) {
4781 memcpy(&temp, &addr->a, sizeof(temp));
4782 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4783 addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4784 if (space_left < addrlen) {
4785 err = -ENOMEM; /*fixme: right error?*/
4786 goto out;
4788 memcpy(buf, &temp, addrlen);
4789 buf += addrlen;
4790 bytes_copied += addrlen;
4791 cnt ++;
4792 space_left -= addrlen;
4795 copy_getaddrs:
4796 if (copy_to_user(to, addrs, bytes_copied)) {
4797 err = -EFAULT;
4798 goto out;
4800 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4801 err = -EFAULT;
4802 goto out;
4804 if (put_user(bytes_copied, optlen))
4805 err = -EFAULT;
4806 out:
4807 kfree(addrs);
4808 return err;
4811 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4813 * Requests that the local SCTP stack use the enclosed peer address as
4814 * the association primary. The enclosed address must be one of the
4815 * association peer's addresses.
4817 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4818 char __user *optval, int __user *optlen)
4820 struct sctp_prim prim;
4821 struct sctp_association *asoc;
4822 struct sctp_sock *sp = sctp_sk(sk);
4824 if (len < sizeof(struct sctp_prim))
4825 return -EINVAL;
4827 len = sizeof(struct sctp_prim);
4829 if (copy_from_user(&prim, optval, len))
4830 return -EFAULT;
4832 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4833 if (!asoc)
4834 return -EINVAL;
4836 if (!asoc->peer.primary_path)
4837 return -ENOTCONN;
4839 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4840 asoc->peer.primary_path->af_specific->sockaddr_len);
4842 sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4843 (union sctp_addr *)&prim.ssp_addr);
4845 if (put_user(len, optlen))
4846 return -EFAULT;
4847 if (copy_to_user(optval, &prim, len))
4848 return -EFAULT;
4850 return 0;
4854 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4856 * Requests that the local endpoint set the specified Adaptation Layer
4857 * Indication parameter for all future INIT and INIT-ACK exchanges.
4859 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4860 char __user *optval, int __user *optlen)
4862 struct sctp_setadaptation adaptation;
4864 if (len < sizeof(struct sctp_setadaptation))
4865 return -EINVAL;
4867 len = sizeof(struct sctp_setadaptation);
4869 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4871 if (put_user(len, optlen))
4872 return -EFAULT;
4873 if (copy_to_user(optval, &adaptation, len))
4874 return -EFAULT;
4876 return 0;
4881 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4883 * Applications that wish to use the sendto() system call may wish to
4884 * specify a default set of parameters that would normally be supplied
4885 * through the inclusion of ancillary data. This socket option allows
4886 * such an application to set the default sctp_sndrcvinfo structure.
4889 * The application that wishes to use this socket option simply passes
4890 * in to this call the sctp_sndrcvinfo structure defined in Section
4891 * 5.2.2) The input parameters accepted by this call include
4892 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4893 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
4894 * to this call if the caller is using the UDP model.
4896 * For getsockopt, it get the default sctp_sndrcvinfo structure.
4898 static int sctp_getsockopt_default_send_param(struct sock *sk,
4899 int len, char __user *optval,
4900 int __user *optlen)
4902 struct sctp_sndrcvinfo info;
4903 struct sctp_association *asoc;
4904 struct sctp_sock *sp = sctp_sk(sk);
4906 if (len < sizeof(struct sctp_sndrcvinfo))
4907 return -EINVAL;
4909 len = sizeof(struct sctp_sndrcvinfo);
4911 if (copy_from_user(&info, optval, len))
4912 return -EFAULT;
4914 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4915 if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4916 return -EINVAL;
4918 if (asoc) {
4919 info.sinfo_stream = asoc->default_stream;
4920 info.sinfo_flags = asoc->default_flags;
4921 info.sinfo_ppid = asoc->default_ppid;
4922 info.sinfo_context = asoc->default_context;
4923 info.sinfo_timetolive = asoc->default_timetolive;
4924 } else {
4925 info.sinfo_stream = sp->default_stream;
4926 info.sinfo_flags = sp->default_flags;
4927 info.sinfo_ppid = sp->default_ppid;
4928 info.sinfo_context = sp->default_context;
4929 info.sinfo_timetolive = sp->default_timetolive;
4932 if (put_user(len, optlen))
4933 return -EFAULT;
4934 if (copy_to_user(optval, &info, len))
4935 return -EFAULT;
4937 return 0;
4942 * 7.1.5 SCTP_NODELAY
4944 * Turn on/off any Nagle-like algorithm. This means that packets are
4945 * generally sent as soon as possible and no unnecessary delays are
4946 * introduced, at the cost of more packets in the network. Expects an
4947 * integer boolean flag.
4950 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4951 char __user *optval, int __user *optlen)
4953 int val;
4955 if (len < sizeof(int))
4956 return -EINVAL;
4958 len = sizeof(int);
4959 val = (sctp_sk(sk)->nodelay == 1);
4960 if (put_user(len, optlen))
4961 return -EFAULT;
4962 if (copy_to_user(optval, &val, len))
4963 return -EFAULT;
4964 return 0;
4969 * 7.1.1 SCTP_RTOINFO
4971 * The protocol parameters used to initialize and bound retransmission
4972 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4973 * and modify these parameters.
4974 * All parameters are time values, in milliseconds. A value of 0, when
4975 * modifying the parameters, indicates that the current value should not
4976 * be changed.
4979 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4980 char __user *optval,
4981 int __user *optlen) {
4982 struct sctp_rtoinfo rtoinfo;
4983 struct sctp_association *asoc;
4985 if (len < sizeof (struct sctp_rtoinfo))
4986 return -EINVAL;
4988 len = sizeof(struct sctp_rtoinfo);
4990 if (copy_from_user(&rtoinfo, optval, len))
4991 return -EFAULT;
4993 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
4995 if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
4996 return -EINVAL;
4998 /* Values corresponding to the specific association. */
4999 if (asoc) {
5000 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5001 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5002 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5003 } else {
5004 /* Values corresponding to the endpoint. */
5005 struct sctp_sock *sp = sctp_sk(sk);
5007 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5008 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5009 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5012 if (put_user(len, optlen))
5013 return -EFAULT;
5015 if (copy_to_user(optval, &rtoinfo, len))
5016 return -EFAULT;
5018 return 0;
5023 * 7.1.2 SCTP_ASSOCINFO
5025 * This option is used to tune the maximum retransmission attempts
5026 * of the association.
5027 * Returns an error if the new association retransmission value is
5028 * greater than the sum of the retransmission value of the peer.
5029 * See [SCTP] for more information.
5032 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5033 char __user *optval,
5034 int __user *optlen)
5037 struct sctp_assocparams assocparams;
5038 struct sctp_association *asoc;
5039 struct list_head *pos;
5040 int cnt = 0;
5042 if (len < sizeof (struct sctp_assocparams))
5043 return -EINVAL;
5045 len = sizeof(struct sctp_assocparams);
5047 if (copy_from_user(&assocparams, optval, len))
5048 return -EFAULT;
5050 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5052 if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5053 return -EINVAL;
5055 /* Values correspoinding to the specific association */
5056 if (asoc) {
5057 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5058 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5059 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5060 assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5061 * 1000) +
5062 (asoc->cookie_life.tv_usec
5063 / 1000);
5065 list_for_each(pos, &asoc->peer.transport_addr_list) {
5066 cnt ++;
5069 assocparams.sasoc_number_peer_destinations = cnt;
5070 } else {
5071 /* Values corresponding to the endpoint */
5072 struct sctp_sock *sp = sctp_sk(sk);
5074 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5075 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5076 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5077 assocparams.sasoc_cookie_life =
5078 sp->assocparams.sasoc_cookie_life;
5079 assocparams.sasoc_number_peer_destinations =
5080 sp->assocparams.
5081 sasoc_number_peer_destinations;
5084 if (put_user(len, optlen))
5085 return -EFAULT;
5087 if (copy_to_user(optval, &assocparams, len))
5088 return -EFAULT;
5090 return 0;
5094 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5096 * This socket option is a boolean flag which turns on or off mapped V4
5097 * addresses. If this option is turned on and the socket is type
5098 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5099 * If this option is turned off, then no mapping will be done of V4
5100 * addresses and a user will receive both PF_INET6 and PF_INET type
5101 * addresses on the socket.
5103 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5104 char __user *optval, int __user *optlen)
5106 int val;
5107 struct sctp_sock *sp = sctp_sk(sk);
5109 if (len < sizeof(int))
5110 return -EINVAL;
5112 len = sizeof(int);
5113 val = sp->v4mapped;
5114 if (put_user(len, optlen))
5115 return -EFAULT;
5116 if (copy_to_user(optval, &val, len))
5117 return -EFAULT;
5119 return 0;
5123 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
5124 * (chapter and verse is quoted at sctp_setsockopt_context())
5126 static int sctp_getsockopt_context(struct sock *sk, int len,
5127 char __user *optval, int __user *optlen)
5129 struct sctp_assoc_value params;
5130 struct sctp_sock *sp;
5131 struct sctp_association *asoc;
5133 if (len < sizeof(struct sctp_assoc_value))
5134 return -EINVAL;
5136 len = sizeof(struct sctp_assoc_value);
5138 if (copy_from_user(&params, optval, len))
5139 return -EFAULT;
5141 sp = sctp_sk(sk);
5143 if (params.assoc_id != 0) {
5144 asoc = sctp_id2assoc(sk, params.assoc_id);
5145 if (!asoc)
5146 return -EINVAL;
5147 params.assoc_value = asoc->default_rcv_context;
5148 } else {
5149 params.assoc_value = sp->default_rcv_context;
5152 if (put_user(len, optlen))
5153 return -EFAULT;
5154 if (copy_to_user(optval, &params, len))
5155 return -EFAULT;
5157 return 0;
5161 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5162 * This option will get or set the maximum size to put in any outgoing
5163 * SCTP DATA chunk. If a message is larger than this size it will be
5164 * fragmented by SCTP into the specified size. Note that the underlying
5165 * SCTP implementation may fragment into smaller sized chunks when the
5166 * PMTU of the underlying association is smaller than the value set by
5167 * the user. The default value for this option is '0' which indicates
5168 * the user is NOT limiting fragmentation and only the PMTU will effect
5169 * SCTP's choice of DATA chunk size. Note also that values set larger
5170 * than the maximum size of an IP datagram will effectively let SCTP
5171 * control fragmentation (i.e. the same as setting this option to 0).
5173 * The following structure is used to access and modify this parameter:
5175 * struct sctp_assoc_value {
5176 * sctp_assoc_t assoc_id;
5177 * uint32_t assoc_value;
5178 * };
5180 * assoc_id: This parameter is ignored for one-to-one style sockets.
5181 * For one-to-many style sockets this parameter indicates which
5182 * association the user is performing an action upon. Note that if
5183 * this field's value is zero then the endpoints default value is
5184 * changed (effecting future associations only).
5185 * assoc_value: This parameter specifies the maximum size in bytes.
5187 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5188 char __user *optval, int __user *optlen)
5190 struct sctp_assoc_value params;
5191 struct sctp_association *asoc;
5193 if (len == sizeof(int)) {
5194 printk(KERN_WARNING
5195 "SCTP: Use of int in maxseg socket option deprecated\n");
5196 printk(KERN_WARNING
5197 "SCTP: Use struct sctp_assoc_value instead\n");
5198 params.assoc_id = 0;
5199 } else if (len >= sizeof(struct sctp_assoc_value)) {
5200 len = sizeof(struct sctp_assoc_value);
5201 if (copy_from_user(&params, optval, sizeof(params)))
5202 return -EFAULT;
5203 } else
5204 return -EINVAL;
5206 asoc = sctp_id2assoc(sk, params.assoc_id);
5207 if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5208 return -EINVAL;
5210 if (asoc)
5211 params.assoc_value = asoc->frag_point;
5212 else
5213 params.assoc_value = sctp_sk(sk)->user_frag;
5215 if (put_user(len, optlen))
5216 return -EFAULT;
5217 if (len == sizeof(int)) {
5218 if (copy_to_user(optval, &params.assoc_value, len))
5219 return -EFAULT;
5220 } else {
5221 if (copy_to_user(optval, &params, len))
5222 return -EFAULT;
5225 return 0;
5229 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5230 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5232 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5233 char __user *optval, int __user *optlen)
5235 int val;
5237 if (len < sizeof(int))
5238 return -EINVAL;
5240 len = sizeof(int);
5242 val = sctp_sk(sk)->frag_interleave;
5243 if (put_user(len, optlen))
5244 return -EFAULT;
5245 if (copy_to_user(optval, &val, len))
5246 return -EFAULT;
5248 return 0;
5252 * 7.1.25. Set or Get the sctp partial delivery point
5253 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5255 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5256 char __user *optval,
5257 int __user *optlen)
5259 u32 val;
5261 if (len < sizeof(u32))
5262 return -EINVAL;
5264 len = sizeof(u32);
5266 val = sctp_sk(sk)->pd_point;
5267 if (put_user(len, optlen))
5268 return -EFAULT;
5269 if (copy_to_user(optval, &val, len))
5270 return -EFAULT;
5272 return -ENOTSUPP;
5276 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
5277 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5279 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5280 char __user *optval,
5281 int __user *optlen)
5283 struct sctp_assoc_value params;
5284 struct sctp_sock *sp;
5285 struct sctp_association *asoc;
5287 if (len < sizeof(int))
5288 return -EINVAL;
5290 if (len == sizeof(int)) {
5291 printk(KERN_WARNING
5292 "SCTP: Use of int in max_burst socket option deprecated\n");
5293 printk(KERN_WARNING
5294 "SCTP: Use struct sctp_assoc_value instead\n");
5295 params.assoc_id = 0;
5296 } else if (len == sizeof (struct sctp_assoc_value)) {
5297 if (copy_from_user(&params, optval, len))
5298 return -EFAULT;
5299 } else
5300 return -EINVAL;
5302 sp = sctp_sk(sk);
5304 if (params.assoc_id != 0) {
5305 asoc = sctp_id2assoc(sk, params.assoc_id);
5306 if (!asoc)
5307 return -EINVAL;
5308 params.assoc_value = asoc->max_burst;
5309 } else
5310 params.assoc_value = sp->max_burst;
5312 if (len == sizeof(int)) {
5313 if (copy_to_user(optval, &params.assoc_value, len))
5314 return -EFAULT;
5315 } else {
5316 if (copy_to_user(optval, &params, len))
5317 return -EFAULT;
5320 return 0;
5324 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5325 char __user *optval, int __user *optlen)
5327 struct sctp_hmacalgo __user *p = (void __user *)optval;
5328 struct sctp_hmac_algo_param *hmacs;
5329 __u16 data_len = 0;
5330 u32 num_idents;
5332 if (!sctp_auth_enable)
5333 return -EACCES;
5335 hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5336 data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5338 if (len < sizeof(struct sctp_hmacalgo) + data_len)
5339 return -EINVAL;
5341 len = sizeof(struct sctp_hmacalgo) + data_len;
5342 num_idents = data_len / sizeof(u16);
5344 if (put_user(len, optlen))
5345 return -EFAULT;
5346 if (put_user(num_idents, &p->shmac_num_idents))
5347 return -EFAULT;
5348 if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5349 return -EFAULT;
5350 return 0;
5353 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5354 char __user *optval, int __user *optlen)
5356 struct sctp_authkeyid val;
5357 struct sctp_association *asoc;
5359 if (!sctp_auth_enable)
5360 return -EACCES;
5362 if (len < sizeof(struct sctp_authkeyid))
5363 return -EINVAL;
5364 if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5365 return -EFAULT;
5367 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5368 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5369 return -EINVAL;
5371 if (asoc)
5372 val.scact_keynumber = asoc->active_key_id;
5373 else
5374 val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5376 len = sizeof(struct sctp_authkeyid);
5377 if (put_user(len, optlen))
5378 return -EFAULT;
5379 if (copy_to_user(optval, &val, len))
5380 return -EFAULT;
5382 return 0;
5385 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5386 char __user *optval, int __user *optlen)
5388 struct sctp_authchunks __user *p = (void __user *)optval;
5389 struct sctp_authchunks val;
5390 struct sctp_association *asoc;
5391 struct sctp_chunks_param *ch;
5392 u32 num_chunks = 0;
5393 char __user *to;
5395 if (!sctp_auth_enable)
5396 return -EACCES;
5398 if (len < sizeof(struct sctp_authchunks))
5399 return -EINVAL;
5401 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5402 return -EFAULT;
5404 to = p->gauth_chunks;
5405 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5406 if (!asoc)
5407 return -EINVAL;
5409 ch = asoc->peer.peer_chunks;
5410 if (!ch)
5411 goto num;
5413 /* See if the user provided enough room for all the data */
5414 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5415 if (len < num_chunks)
5416 return -EINVAL;
5418 if (copy_to_user(to, ch->chunks, num_chunks))
5419 return -EFAULT;
5420 num:
5421 len = sizeof(struct sctp_authchunks) + num_chunks;
5422 if (put_user(len, optlen)) return -EFAULT;
5423 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5424 return -EFAULT;
5425 return 0;
5428 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5429 char __user *optval, int __user *optlen)
5431 struct sctp_authchunks __user *p = (void __user *)optval;
5432 struct sctp_authchunks val;
5433 struct sctp_association *asoc;
5434 struct sctp_chunks_param *ch;
5435 u32 num_chunks = 0;
5436 char __user *to;
5438 if (!sctp_auth_enable)
5439 return -EACCES;
5441 if (len < sizeof(struct sctp_authchunks))
5442 return -EINVAL;
5444 if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5445 return -EFAULT;
5447 to = p->gauth_chunks;
5448 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5449 if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5450 return -EINVAL;
5452 if (asoc)
5453 ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5454 else
5455 ch = sctp_sk(sk)->ep->auth_chunk_list;
5457 if (!ch)
5458 goto num;
5460 num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5461 if (len < sizeof(struct sctp_authchunks) + num_chunks)
5462 return -EINVAL;
5464 if (copy_to_user(to, ch->chunks, num_chunks))
5465 return -EFAULT;
5466 num:
5467 len = sizeof(struct sctp_authchunks) + num_chunks;
5468 if (put_user(len, optlen))
5469 return -EFAULT;
5470 if (put_user(num_chunks, &p->gauth_number_of_chunks))
5471 return -EFAULT;
5473 return 0;
5477 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5478 * This option gets the current number of associations that are attached
5479 * to a one-to-many style socket. The option value is an uint32_t.
5481 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5482 char __user *optval, int __user *optlen)
5484 struct sctp_sock *sp = sctp_sk(sk);
5485 struct sctp_association *asoc;
5486 u32 val = 0;
5488 if (sctp_style(sk, TCP))
5489 return -EOPNOTSUPP;
5491 if (len < sizeof(u32))
5492 return -EINVAL;
5494 len = sizeof(u32);
5496 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5497 val++;
5500 if (put_user(len, optlen))
5501 return -EFAULT;
5502 if (copy_to_user(optval, &val, len))
5503 return -EFAULT;
5505 return 0;
5508 SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
5509 char __user *optval, int __user *optlen)
5511 int retval = 0;
5512 int len;
5514 SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
5515 sk, optname);
5517 /* I can hardly begin to describe how wrong this is. This is
5518 * so broken as to be worse than useless. The API draft
5519 * REALLY is NOT helpful here... I am not convinced that the
5520 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5521 * are at all well-founded.
5523 if (level != SOL_SCTP) {
5524 struct sctp_af *af = sctp_sk(sk)->pf->af;
5526 retval = af->getsockopt(sk, level, optname, optval, optlen);
5527 return retval;
5530 if (get_user(len, optlen))
5531 return -EFAULT;
5533 sctp_lock_sock(sk);
5535 switch (optname) {
5536 case SCTP_STATUS:
5537 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5538 break;
5539 case SCTP_DISABLE_FRAGMENTS:
5540 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5541 optlen);
5542 break;
5543 case SCTP_EVENTS:
5544 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5545 break;
5546 case SCTP_AUTOCLOSE:
5547 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5548 break;
5549 case SCTP_SOCKOPT_PEELOFF:
5550 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5551 break;
5552 case SCTP_PEER_ADDR_PARAMS:
5553 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5554 optlen);
5555 break;
5556 case SCTP_DELAYED_ACK:
5557 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5558 optlen);
5559 break;
5560 case SCTP_INITMSG:
5561 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
5562 break;
5563 case SCTP_GET_PEER_ADDRS_NUM_OLD:
5564 retval = sctp_getsockopt_peer_addrs_num_old(sk, len, optval,
5565 optlen);
5566 break;
5567 case SCTP_GET_LOCAL_ADDRS_NUM_OLD:
5568 retval = sctp_getsockopt_local_addrs_num_old(sk, len, optval,
5569 optlen);
5570 break;
5571 case SCTP_GET_PEER_ADDRS_OLD:
5572 retval = sctp_getsockopt_peer_addrs_old(sk, len, optval,
5573 optlen);
5574 break;
5575 case SCTP_GET_LOCAL_ADDRS_OLD:
5576 retval = sctp_getsockopt_local_addrs_old(sk, len, optval,
5577 optlen);
5578 break;
5579 case SCTP_GET_PEER_ADDRS:
5580 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
5581 optlen);
5582 break;
5583 case SCTP_GET_LOCAL_ADDRS:
5584 retval = sctp_getsockopt_local_addrs(sk, len, optval,
5585 optlen);
5586 break;
5587 case SCTP_DEFAULT_SEND_PARAM:
5588 retval = sctp_getsockopt_default_send_param(sk, len,
5589 optval, optlen);
5590 break;
5591 case SCTP_PRIMARY_ADDR:
5592 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
5593 break;
5594 case SCTP_NODELAY:
5595 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
5596 break;
5597 case SCTP_RTOINFO:
5598 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
5599 break;
5600 case SCTP_ASSOCINFO:
5601 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
5602 break;
5603 case SCTP_I_WANT_MAPPED_V4_ADDR:
5604 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
5605 break;
5606 case SCTP_MAXSEG:
5607 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
5608 break;
5609 case SCTP_GET_PEER_ADDR_INFO:
5610 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
5611 optlen);
5612 break;
5613 case SCTP_ADAPTATION_LAYER:
5614 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
5615 optlen);
5616 break;
5617 case SCTP_CONTEXT:
5618 retval = sctp_getsockopt_context(sk, len, optval, optlen);
5619 break;
5620 case SCTP_FRAGMENT_INTERLEAVE:
5621 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
5622 optlen);
5623 break;
5624 case SCTP_PARTIAL_DELIVERY_POINT:
5625 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
5626 optlen);
5627 break;
5628 case SCTP_MAX_BURST:
5629 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
5630 break;
5631 case SCTP_AUTH_KEY:
5632 case SCTP_AUTH_CHUNK:
5633 case SCTP_AUTH_DELETE_KEY:
5634 retval = -EOPNOTSUPP;
5635 break;
5636 case SCTP_HMAC_IDENT:
5637 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
5638 break;
5639 case SCTP_AUTH_ACTIVE_KEY:
5640 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
5641 break;
5642 case SCTP_PEER_AUTH_CHUNKS:
5643 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
5644 optlen);
5645 break;
5646 case SCTP_LOCAL_AUTH_CHUNKS:
5647 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
5648 optlen);
5649 break;
5650 case SCTP_GET_ASSOC_NUMBER:
5651 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
5652 break;
5653 default:
5654 retval = -ENOPROTOOPT;
5655 break;
5658 sctp_release_sock(sk);
5659 return retval;
5662 static void sctp_hash(struct sock *sk)
5664 /* STUB */
5667 static void sctp_unhash(struct sock *sk)
5669 /* STUB */
5672 /* Check if port is acceptable. Possibly find first available port.
5674 * The port hash table (contained in the 'global' SCTP protocol storage
5675 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
5676 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
5677 * list (the list number is the port number hashed out, so as you
5678 * would expect from a hash function, all the ports in a given list have
5679 * such a number that hashes out to the same list number; you were
5680 * expecting that, right?); so each list has a set of ports, with a
5681 * link to the socket (struct sock) that uses it, the port number and
5682 * a fastreuse flag (FIXME: NPI ipg).
5684 static struct sctp_bind_bucket *sctp_bucket_create(
5685 struct sctp_bind_hashbucket *head, unsigned short snum);
5687 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
5689 struct sctp_bind_hashbucket *head; /* hash list */
5690 struct sctp_bind_bucket *pp; /* hash list port iterator */
5691 struct hlist_node *node;
5692 unsigned short snum;
5693 int ret;
5695 snum = ntohs(addr->v4.sin_port);
5697 SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum);
5698 sctp_local_bh_disable();
5700 if (snum == 0) {
5701 /* Search for an available port. */
5702 int low, high, remaining, index;
5703 unsigned int rover;
5705 inet_get_local_port_range(&low, &high);
5706 remaining = (high - low) + 1;
5707 rover = net_random() % remaining + low;
5709 do {
5710 rover++;
5711 if ((rover < low) || (rover > high))
5712 rover = low;
5713 index = sctp_phashfn(rover);
5714 head = &sctp_port_hashtable[index];
5715 sctp_spin_lock(&head->lock);
5716 sctp_for_each_hentry(pp, node, &head->chain)
5717 if (pp->port == rover)
5718 goto next;
5719 break;
5720 next:
5721 sctp_spin_unlock(&head->lock);
5722 } while (--remaining > 0);
5724 /* Exhausted local port range during search? */
5725 ret = 1;
5726 if (remaining <= 0)
5727 goto fail;
5729 /* OK, here is the one we will use. HEAD (the port
5730 * hash table list entry) is non-NULL and we hold it's
5731 * mutex.
5733 snum = rover;
5734 } else {
5735 /* We are given an specific port number; we verify
5736 * that it is not being used. If it is used, we will
5737 * exahust the search in the hash list corresponding
5738 * to the port number (snum) - we detect that with the
5739 * port iterator, pp being NULL.
5741 head = &sctp_port_hashtable[sctp_phashfn(snum)];
5742 sctp_spin_lock(&head->lock);
5743 sctp_for_each_hentry(pp, node, &head->chain) {
5744 if (pp->port == snum)
5745 goto pp_found;
5748 pp = NULL;
5749 goto pp_not_found;
5750 pp_found:
5751 if (!hlist_empty(&pp->owner)) {
5752 /* We had a port hash table hit - there is an
5753 * available port (pp != NULL) and it is being
5754 * used by other socket (pp->owner not empty); that other
5755 * socket is going to be sk2.
5757 int reuse = sk->sk_reuse;
5758 struct sock *sk2;
5759 struct hlist_node *node;
5761 SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
5762 if (pp->fastreuse && sk->sk_reuse &&
5763 sk->sk_state != SCTP_SS_LISTENING)
5764 goto success;
5766 /* Run through the list of sockets bound to the port
5767 * (pp->port) [via the pointers bind_next and
5768 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
5769 * we get the endpoint they describe and run through
5770 * the endpoint's list of IP (v4 or v6) addresses,
5771 * comparing each of the addresses with the address of
5772 * the socket sk. If we find a match, then that means
5773 * that this port/socket (sk) combination are already
5774 * in an endpoint.
5776 sk_for_each_bound(sk2, node, &pp->owner) {
5777 struct sctp_endpoint *ep2;
5778 ep2 = sctp_sk(sk2)->ep;
5780 if (sk == sk2 ||
5781 (reuse && sk2->sk_reuse &&
5782 sk2->sk_state != SCTP_SS_LISTENING))
5783 continue;
5785 if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
5786 sctp_sk(sk2), sctp_sk(sk))) {
5787 ret = (long)sk2;
5788 goto fail_unlock;
5791 SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n");
5793 pp_not_found:
5794 /* If there was a hash table miss, create a new port. */
5795 ret = 1;
5796 if (!pp && !(pp = sctp_bucket_create(head, snum)))
5797 goto fail_unlock;
5799 /* In either case (hit or miss), make sure fastreuse is 1 only
5800 * if sk->sk_reuse is too (that is, if the caller requested
5801 * SO_REUSEADDR on this socket -sk-).
5803 if (hlist_empty(&pp->owner)) {
5804 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
5805 pp->fastreuse = 1;
5806 else
5807 pp->fastreuse = 0;
5808 } else if (pp->fastreuse &&
5809 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
5810 pp->fastreuse = 0;
5812 /* We are set, so fill up all the data in the hash table
5813 * entry, tie the socket list information with the rest of the
5814 * sockets FIXME: Blurry, NPI (ipg).
5816 success:
5817 if (!sctp_sk(sk)->bind_hash) {
5818 inet_sk(sk)->num = snum;
5819 sk_add_bind_node(sk, &pp->owner);
5820 sctp_sk(sk)->bind_hash = pp;
5822 ret = 0;
5824 fail_unlock:
5825 sctp_spin_unlock(&head->lock);
5827 fail:
5828 sctp_local_bh_enable();
5829 return ret;
5832 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
5833 * port is requested.
5835 static int sctp_get_port(struct sock *sk, unsigned short snum)
5837 long ret;
5838 union sctp_addr addr;
5839 struct sctp_af *af = sctp_sk(sk)->pf->af;
5841 /* Set up a dummy address struct from the sk. */
5842 af->from_sk(&addr, sk);
5843 addr.v4.sin_port = htons(snum);
5845 /* Note: sk->sk_num gets filled in if ephemeral port request. */
5846 ret = sctp_get_port_local(sk, &addr);
5848 return (ret ? 1 : 0);
5852 * 3.1.3 listen() - UDP Style Syntax
5854 * By default, new associations are not accepted for UDP style sockets.
5855 * An application uses listen() to mark a socket as being able to
5856 * accept new associations.
5858 SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
5860 struct sctp_sock *sp = sctp_sk(sk);
5861 struct sctp_endpoint *ep = sp->ep;
5863 /* Only UDP style sockets that are not peeled off are allowed to
5864 * listen().
5866 if (!sctp_style(sk, UDP))
5867 return -EINVAL;
5869 /* If backlog is zero, disable listening. */
5870 if (!backlog) {
5871 if (sctp_sstate(sk, CLOSED))
5872 return 0;
5874 sctp_unhash_endpoint(ep);
5875 sk->sk_state = SCTP_SS_CLOSED;
5876 return 0;
5879 /* Return if we are already listening. */
5880 if (sctp_sstate(sk, LISTENING))
5881 return 0;
5884 * If a bind() or sctp_bindx() is not called prior to a listen()
5885 * call that allows new associations to be accepted, the system
5886 * picks an ephemeral port and will choose an address set equivalent
5887 * to binding with a wildcard address.
5889 * This is not currently spelled out in the SCTP sockets
5890 * extensions draft, but follows the practice as seen in TCP
5891 * sockets.
5893 * Additionally, turn off fastreuse flag since we are not listening
5895 sk->sk_state = SCTP_SS_LISTENING;
5896 if (!ep->base.bind_addr.port) {
5897 if (sctp_autobind(sk))
5898 return -EAGAIN;
5899 } else {
5900 if (sctp_get_port(sk, inet_sk(sk)->num)) {
5901 sk->sk_state = SCTP_SS_CLOSED;
5902 return -EADDRINUSE;
5904 sctp_sk(sk)->bind_hash->fastreuse = 0;
5907 sctp_hash_endpoint(ep);
5908 return 0;
5912 * 4.1.3 listen() - TCP Style Syntax
5914 * Applications uses listen() to ready the SCTP endpoint for accepting
5915 * inbound associations.
5917 SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
5919 struct sctp_sock *sp = sctp_sk(sk);
5920 struct sctp_endpoint *ep = sp->ep;
5922 /* If backlog is zero, disable listening. */
5923 if (!backlog) {
5924 if (sctp_sstate(sk, CLOSED))
5925 return 0;
5927 sctp_unhash_endpoint(ep);
5928 sk->sk_state = SCTP_SS_CLOSED;
5929 return 0;
5932 if (sctp_sstate(sk, LISTENING))
5933 return 0;
5936 * If a bind() or sctp_bindx() is not called prior to a listen()
5937 * call that allows new associations to be accepted, the system
5938 * picks an ephemeral port and will choose an address set equivalent
5939 * to binding with a wildcard address.
5941 * This is not currently spelled out in the SCTP sockets
5942 * extensions draft, but follows the practice as seen in TCP
5943 * sockets.
5945 sk->sk_state = SCTP_SS_LISTENING;
5946 if (!ep->base.bind_addr.port) {
5947 if (sctp_autobind(sk))
5948 return -EAGAIN;
5949 } else
5950 sctp_sk(sk)->bind_hash->fastreuse = 0;
5952 sk->sk_max_ack_backlog = backlog;
5953 sctp_hash_endpoint(ep);
5954 return 0;
5958 * Move a socket to LISTENING state.
5960 int sctp_inet_listen(struct socket *sock, int backlog)
5962 struct sock *sk = sock->sk;
5963 struct crypto_hash *tfm = NULL;
5964 int err = -EINVAL;
5966 if (unlikely(backlog < 0))
5967 goto out;
5969 sctp_lock_sock(sk);
5971 if (sock->state != SS_UNCONNECTED)
5972 goto out;
5974 /* Allocate HMAC for generating cookie. */
5975 if (!sctp_sk(sk)->hmac && sctp_hmac_alg) {
5976 tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC);
5977 if (IS_ERR(tfm)) {
5978 if (net_ratelimit()) {
5979 printk(KERN_INFO
5980 "SCTP: failed to load transform for %s: %ld\n",
5981 sctp_hmac_alg, PTR_ERR(tfm));
5983 err = -ENOSYS;
5984 goto out;
5988 switch (sock->type) {
5989 case SOCK_SEQPACKET:
5990 err = sctp_seqpacket_listen(sk, backlog);
5991 break;
5992 case SOCK_STREAM:
5993 err = sctp_stream_listen(sk, backlog);
5994 break;
5995 default:
5996 break;
5999 if (err)
6000 goto cleanup;
6002 /* Store away the transform reference. */
6003 if (!sctp_sk(sk)->hmac)
6004 sctp_sk(sk)->hmac = tfm;
6005 out:
6006 sctp_release_sock(sk);
6007 return err;
6008 cleanup:
6009 crypto_free_hash(tfm);
6010 goto out;
6014 * This function is done by modeling the current datagram_poll() and the
6015 * tcp_poll(). Note that, based on these implementations, we don't
6016 * lock the socket in this function, even though it seems that,
6017 * ideally, locking or some other mechanisms can be used to ensure
6018 * the integrity of the counters (sndbuf and wmem_alloc) used
6019 * in this place. We assume that we don't need locks either until proven
6020 * otherwise.
6022 * Another thing to note is that we include the Async I/O support
6023 * here, again, by modeling the current TCP/UDP code. We don't have
6024 * a good way to test with it yet.
6026 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6028 struct sock *sk = sock->sk;
6029 struct sctp_sock *sp = sctp_sk(sk);
6030 unsigned int mask;
6032 poll_wait(file, sk->sk_sleep, wait);
6034 /* A TCP-style listening socket becomes readable when the accept queue
6035 * is not empty.
6037 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6038 return (!list_empty(&sp->ep->asocs)) ?
6039 (POLLIN | POLLRDNORM) : 0;
6041 mask = 0;
6043 /* Is there any exceptional events? */
6044 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6045 mask |= POLLERR;
6046 if (sk->sk_shutdown & RCV_SHUTDOWN)
6047 mask |= POLLRDHUP;
6048 if (sk->sk_shutdown == SHUTDOWN_MASK)
6049 mask |= POLLHUP;
6051 /* Is it readable? Reconsider this code with TCP-style support. */
6052 if (!skb_queue_empty(&sk->sk_receive_queue) ||
6053 (sk->sk_shutdown & RCV_SHUTDOWN))
6054 mask |= POLLIN | POLLRDNORM;
6056 /* The association is either gone or not ready. */
6057 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6058 return mask;
6060 /* Is it writable? */
6061 if (sctp_writeable(sk)) {
6062 mask |= POLLOUT | POLLWRNORM;
6063 } else {
6064 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6066 * Since the socket is not locked, the buffer
6067 * might be made available after the writeable check and
6068 * before the bit is set. This could cause a lost I/O
6069 * signal. tcp_poll() has a race breaker for this race
6070 * condition. Based on their implementation, we put
6071 * in the following code to cover it as well.
6073 if (sctp_writeable(sk))
6074 mask |= POLLOUT | POLLWRNORM;
6076 return mask;
6079 /********************************************************************
6080 * 2nd Level Abstractions
6081 ********************************************************************/
6083 static struct sctp_bind_bucket *sctp_bucket_create(
6084 struct sctp_bind_hashbucket *head, unsigned short snum)
6086 struct sctp_bind_bucket *pp;
6088 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6089 if (pp) {
6090 SCTP_DBG_OBJCNT_INC(bind_bucket);
6091 pp->port = snum;
6092 pp->fastreuse = 0;
6093 INIT_HLIST_HEAD(&pp->owner);
6094 hlist_add_head(&pp->node, &head->chain);
6096 return pp;
6099 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6100 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6102 if (pp && hlist_empty(&pp->owner)) {
6103 __hlist_del(&pp->node);
6104 kmem_cache_free(sctp_bucket_cachep, pp);
6105 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6109 /* Release this socket's reference to a local port. */
6110 static inline void __sctp_put_port(struct sock *sk)
6112 struct sctp_bind_hashbucket *head =
6113 &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->num)];
6114 struct sctp_bind_bucket *pp;
6116 sctp_spin_lock(&head->lock);
6117 pp = sctp_sk(sk)->bind_hash;
6118 __sk_del_bind_node(sk);
6119 sctp_sk(sk)->bind_hash = NULL;
6120 inet_sk(sk)->num = 0;
6121 sctp_bucket_destroy(pp);
6122 sctp_spin_unlock(&head->lock);
6125 void sctp_put_port(struct sock *sk)
6127 sctp_local_bh_disable();
6128 __sctp_put_port(sk);
6129 sctp_local_bh_enable();
6133 * The system picks an ephemeral port and choose an address set equivalent
6134 * to binding with a wildcard address.
6135 * One of those addresses will be the primary address for the association.
6136 * This automatically enables the multihoming capability of SCTP.
6138 static int sctp_autobind(struct sock *sk)
6140 union sctp_addr autoaddr;
6141 struct sctp_af *af;
6142 __be16 port;
6144 /* Initialize a local sockaddr structure to INADDR_ANY. */
6145 af = sctp_sk(sk)->pf->af;
6147 port = htons(inet_sk(sk)->num);
6148 af->inaddr_any(&autoaddr, port);
6150 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6153 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
6155 * From RFC 2292
6156 * 4.2 The cmsghdr Structure *
6158 * When ancillary data is sent or received, any number of ancillary data
6159 * objects can be specified by the msg_control and msg_controllen members of
6160 * the msghdr structure, because each object is preceded by
6161 * a cmsghdr structure defining the object's length (the cmsg_len member).
6162 * Historically Berkeley-derived implementations have passed only one object
6163 * at a time, but this API allows multiple objects to be
6164 * passed in a single call to sendmsg() or recvmsg(). The following example
6165 * shows two ancillary data objects in a control buffer.
6167 * |<--------------------------- msg_controllen -------------------------->|
6168 * | |
6170 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
6172 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6173 * | | |
6175 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
6177 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
6178 * | | | | |
6180 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6181 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
6183 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
6185 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6189 * msg_control
6190 * points here
6192 SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
6193 sctp_cmsgs_t *cmsgs)
6195 struct cmsghdr *cmsg;
6196 struct msghdr *my_msg = (struct msghdr *)msg;
6198 for (cmsg = CMSG_FIRSTHDR(msg);
6199 cmsg != NULL;
6200 cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
6201 if (!CMSG_OK(my_msg, cmsg))
6202 return -EINVAL;
6204 /* Should we parse this header or ignore? */
6205 if (cmsg->cmsg_level != IPPROTO_SCTP)
6206 continue;
6208 /* Strictly check lengths following example in SCM code. */
6209 switch (cmsg->cmsg_type) {
6210 case SCTP_INIT:
6211 /* SCTP Socket API Extension
6212 * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
6214 * This cmsghdr structure provides information for
6215 * initializing new SCTP associations with sendmsg().
6216 * The SCTP_INITMSG socket option uses this same data
6217 * structure. This structure is not used for
6218 * recvmsg().
6220 * cmsg_level cmsg_type cmsg_data[]
6221 * ------------ ------------ ----------------------
6222 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
6224 if (cmsg->cmsg_len !=
6225 CMSG_LEN(sizeof(struct sctp_initmsg)))
6226 return -EINVAL;
6227 cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
6228 break;
6230 case SCTP_SNDRCV:
6231 /* SCTP Socket API Extension
6232 * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
6234 * This cmsghdr structure specifies SCTP options for
6235 * sendmsg() and describes SCTP header information
6236 * about a received message through recvmsg().
6238 * cmsg_level cmsg_type cmsg_data[]
6239 * ------------ ------------ ----------------------
6240 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
6242 if (cmsg->cmsg_len !=
6243 CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
6244 return -EINVAL;
6246 cmsgs->info =
6247 (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
6249 /* Minimally, validate the sinfo_flags. */
6250 if (cmsgs->info->sinfo_flags &
6251 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
6252 SCTP_ABORT | SCTP_EOF))
6253 return -EINVAL;
6254 break;
6256 default:
6257 return -EINVAL;
6260 return 0;
6264 * Wait for a packet..
6265 * Note: This function is the same function as in core/datagram.c
6266 * with a few modifications to make lksctp work.
6268 static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p)
6270 int error;
6271 DEFINE_WAIT(wait);
6273 prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6275 /* Socket errors? */
6276 error = sock_error(sk);
6277 if (error)
6278 goto out;
6280 if (!skb_queue_empty(&sk->sk_receive_queue))
6281 goto ready;
6283 /* Socket shut down? */
6284 if (sk->sk_shutdown & RCV_SHUTDOWN)
6285 goto out;
6287 /* Sequenced packets can come disconnected. If so we report the
6288 * problem.
6290 error = -ENOTCONN;
6292 /* Is there a good reason to think that we may receive some data? */
6293 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
6294 goto out;
6296 /* Handle signals. */
6297 if (signal_pending(current))
6298 goto interrupted;
6300 /* Let another process have a go. Since we are going to sleep
6301 * anyway. Note: This may cause odd behaviors if the message
6302 * does not fit in the user's buffer, but this seems to be the
6303 * only way to honor MSG_DONTWAIT realistically.
6305 sctp_release_sock(sk);
6306 *timeo_p = schedule_timeout(*timeo_p);
6307 sctp_lock_sock(sk);
6309 ready:
6310 finish_wait(sk->sk_sleep, &wait);
6311 return 0;
6313 interrupted:
6314 error = sock_intr_errno(*timeo_p);
6316 out:
6317 finish_wait(sk->sk_sleep, &wait);
6318 *err = error;
6319 return error;
6322 /* Receive a datagram.
6323 * Note: This is pretty much the same routine as in core/datagram.c
6324 * with a few changes to make lksctp work.
6326 static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
6327 int noblock, int *err)
6329 int error;
6330 struct sk_buff *skb;
6331 long timeo;
6333 timeo = sock_rcvtimeo(sk, noblock);
6335 SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n",
6336 timeo, MAX_SCHEDULE_TIMEOUT);
6338 do {
6339 /* Again only user level code calls this function,
6340 * so nothing interrupt level
6341 * will suddenly eat the receive_queue.
6343 * Look at current nfs client by the way...
6344 * However, this function was corrent in any case. 8)
6346 if (flags & MSG_PEEK) {
6347 spin_lock_bh(&sk->sk_receive_queue.lock);
6348 skb = skb_peek(&sk->sk_receive_queue);
6349 if (skb)
6350 atomic_inc(&skb->users);
6351 spin_unlock_bh(&sk->sk_receive_queue.lock);
6352 } else {
6353 skb = skb_dequeue(&sk->sk_receive_queue);
6356 if (skb)
6357 return skb;
6359 /* Caller is allowed not to check sk->sk_err before calling. */
6360 error = sock_error(sk);
6361 if (error)
6362 goto no_packet;
6364 if (sk->sk_shutdown & RCV_SHUTDOWN)
6365 break;
6367 /* User doesn't want to wait. */
6368 error = -EAGAIN;
6369 if (!timeo)
6370 goto no_packet;
6371 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
6373 return NULL;
6375 no_packet:
6376 *err = error;
6377 return NULL;
6380 /* If sndbuf has changed, wake up per association sndbuf waiters. */
6381 static void __sctp_write_space(struct sctp_association *asoc)
6383 struct sock *sk = asoc->base.sk;
6384 struct socket *sock = sk->sk_socket;
6386 if ((sctp_wspace(asoc) > 0) && sock) {
6387 if (waitqueue_active(&asoc->wait))
6388 wake_up_interruptible(&asoc->wait);
6390 if (sctp_writeable(sk)) {
6391 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
6392 wake_up_interruptible(sk->sk_sleep);
6394 /* Note that we try to include the Async I/O support
6395 * here by modeling from the current TCP/UDP code.
6396 * We have not tested with it yet.
6398 if (sock->fasync_list &&
6399 !(sk->sk_shutdown & SEND_SHUTDOWN))
6400 sock_wake_async(sock,
6401 SOCK_WAKE_SPACE, POLL_OUT);
6406 /* Do accounting for the sndbuf space.
6407 * Decrement the used sndbuf space of the corresponding association by the
6408 * data size which was just transmitted(freed).
6410 static void sctp_wfree(struct sk_buff *skb)
6412 struct sctp_association *asoc;
6413 struct sctp_chunk *chunk;
6414 struct sock *sk;
6416 /* Get the saved chunk pointer. */
6417 chunk = *((struct sctp_chunk **)(skb->cb));
6418 asoc = chunk->asoc;
6419 sk = asoc->base.sk;
6420 asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
6421 sizeof(struct sk_buff) +
6422 sizeof(struct sctp_chunk);
6424 atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
6427 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
6429 sk->sk_wmem_queued -= skb->truesize;
6430 sk_mem_uncharge(sk, skb->truesize);
6432 sock_wfree(skb);
6433 __sctp_write_space(asoc);
6435 sctp_association_put(asoc);
6438 /* Do accounting for the receive space on the socket.
6439 * Accounting for the association is done in ulpevent.c
6440 * We set this as a destructor for the cloned data skbs so that
6441 * accounting is done at the correct time.
6443 void sctp_sock_rfree(struct sk_buff *skb)
6445 struct sock *sk = skb->sk;
6446 struct sctp_ulpevent *event = sctp_skb2event(skb);
6448 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
6451 * Mimic the behavior of sock_rfree
6453 sk_mem_uncharge(sk, event->rmem_len);
6457 /* Helper function to wait for space in the sndbuf. */
6458 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
6459 size_t msg_len)
6461 struct sock *sk = asoc->base.sk;
6462 int err = 0;
6463 long current_timeo = *timeo_p;
6464 DEFINE_WAIT(wait);
6466 SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n",
6467 asoc, (long)(*timeo_p), msg_len);
6469 /* Increment the association's refcnt. */
6470 sctp_association_hold(asoc);
6472 /* Wait on the association specific sndbuf space. */
6473 for (;;) {
6474 prepare_to_wait_exclusive(&asoc->wait, &wait,
6475 TASK_INTERRUPTIBLE);
6476 if (!*timeo_p)
6477 goto do_nonblock;
6478 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6479 asoc->base.dead)
6480 goto do_error;
6481 if (signal_pending(current))
6482 goto do_interrupted;
6483 if (msg_len <= sctp_wspace(asoc))
6484 break;
6486 /* Let another process have a go. Since we are going
6487 * to sleep anyway.
6489 sctp_release_sock(sk);
6490 current_timeo = schedule_timeout(current_timeo);
6491 BUG_ON(sk != asoc->base.sk);
6492 sctp_lock_sock(sk);
6494 *timeo_p = current_timeo;
6497 out:
6498 finish_wait(&asoc->wait, &wait);
6500 /* Release the association's refcnt. */
6501 sctp_association_put(asoc);
6503 return err;
6505 do_error:
6506 err = -EPIPE;
6507 goto out;
6509 do_interrupted:
6510 err = sock_intr_errno(*timeo_p);
6511 goto out;
6513 do_nonblock:
6514 err = -EAGAIN;
6515 goto out;
6518 /* If socket sndbuf has changed, wake up all per association waiters. */
6519 void sctp_write_space(struct sock *sk)
6521 struct sctp_association *asoc;
6523 /* Wake up the tasks in each wait queue. */
6524 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
6525 __sctp_write_space(asoc);
6529 /* Is there any sndbuf space available on the socket?
6531 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
6532 * associations on the same socket. For a UDP-style socket with
6533 * multiple associations, it is possible for it to be "unwriteable"
6534 * prematurely. I assume that this is acceptable because
6535 * a premature "unwriteable" is better than an accidental "writeable" which
6536 * would cause an unwanted block under certain circumstances. For the 1-1
6537 * UDP-style sockets or TCP-style sockets, this code should work.
6538 * - Daisy
6540 static int sctp_writeable(struct sock *sk)
6542 int amt = 0;
6544 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
6545 if (amt < 0)
6546 amt = 0;
6547 return amt;
6550 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
6551 * returns immediately with EINPROGRESS.
6553 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
6555 struct sock *sk = asoc->base.sk;
6556 int err = 0;
6557 long current_timeo = *timeo_p;
6558 DEFINE_WAIT(wait);
6560 SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc,
6561 (long)(*timeo_p));
6563 /* Increment the association's refcnt. */
6564 sctp_association_hold(asoc);
6566 for (;;) {
6567 prepare_to_wait_exclusive(&asoc->wait, &wait,
6568 TASK_INTERRUPTIBLE);
6569 if (!*timeo_p)
6570 goto do_nonblock;
6571 if (sk->sk_shutdown & RCV_SHUTDOWN)
6572 break;
6573 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
6574 asoc->base.dead)
6575 goto do_error;
6576 if (signal_pending(current))
6577 goto do_interrupted;
6579 if (sctp_state(asoc, ESTABLISHED))
6580 break;
6582 /* Let another process have a go. Since we are going
6583 * to sleep anyway.
6585 sctp_release_sock(sk);
6586 current_timeo = schedule_timeout(current_timeo);
6587 sctp_lock_sock(sk);
6589 *timeo_p = current_timeo;
6592 out:
6593 finish_wait(&asoc->wait, &wait);
6595 /* Release the association's refcnt. */
6596 sctp_association_put(asoc);
6598 return err;
6600 do_error:
6601 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
6602 err = -ETIMEDOUT;
6603 else
6604 err = -ECONNREFUSED;
6605 goto out;
6607 do_interrupted:
6608 err = sock_intr_errno(*timeo_p);
6609 goto out;
6611 do_nonblock:
6612 err = -EINPROGRESS;
6613 goto out;
6616 static int sctp_wait_for_accept(struct sock *sk, long timeo)
6618 struct sctp_endpoint *ep;
6619 int err = 0;
6620 DEFINE_WAIT(wait);
6622 ep = sctp_sk(sk)->ep;
6625 for (;;) {
6626 prepare_to_wait_exclusive(sk->sk_sleep, &wait,
6627 TASK_INTERRUPTIBLE);
6629 if (list_empty(&ep->asocs)) {
6630 sctp_release_sock(sk);
6631 timeo = schedule_timeout(timeo);
6632 sctp_lock_sock(sk);
6635 err = -EINVAL;
6636 if (!sctp_sstate(sk, LISTENING))
6637 break;
6639 err = 0;
6640 if (!list_empty(&ep->asocs))
6641 break;
6643 err = sock_intr_errno(timeo);
6644 if (signal_pending(current))
6645 break;
6647 err = -EAGAIN;
6648 if (!timeo)
6649 break;
6652 finish_wait(sk->sk_sleep, &wait);
6654 return err;
6657 static void sctp_wait_for_close(struct sock *sk, long timeout)
6659 DEFINE_WAIT(wait);
6661 do {
6662 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
6663 if (list_empty(&sctp_sk(sk)->ep->asocs))
6664 break;
6665 sctp_release_sock(sk);
6666 timeout = schedule_timeout(timeout);
6667 sctp_lock_sock(sk);
6668 } while (!signal_pending(current) && timeout);
6670 finish_wait(sk->sk_sleep, &wait);
6673 static void sctp_sock_rfree_frag(struct sk_buff *skb)
6675 struct sk_buff *frag;
6677 if (!skb->data_len)
6678 goto done;
6680 /* Don't forget the fragments. */
6681 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6682 sctp_sock_rfree_frag(frag);
6684 done:
6685 sctp_sock_rfree(skb);
6688 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
6690 struct sk_buff *frag;
6692 if (!skb->data_len)
6693 goto done;
6695 /* Don't forget the fragments. */
6696 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next)
6697 sctp_skb_set_owner_r_frag(frag, sk);
6699 done:
6700 sctp_skb_set_owner_r(skb, sk);
6703 /* Populate the fields of the newsk from the oldsk and migrate the assoc
6704 * and its messages to the newsk.
6706 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
6707 struct sctp_association *assoc,
6708 sctp_socket_type_t type)
6710 struct sctp_sock *oldsp = sctp_sk(oldsk);
6711 struct sctp_sock *newsp = sctp_sk(newsk);
6712 struct sctp_bind_bucket *pp; /* hash list port iterator */
6713 struct sctp_endpoint *newep = newsp->ep;
6714 struct sk_buff *skb, *tmp;
6715 struct sctp_ulpevent *event;
6716 struct sctp_bind_hashbucket *head;
6718 /* Migrate socket buffer sizes and all the socket level options to the
6719 * new socket.
6721 newsk->sk_sndbuf = oldsk->sk_sndbuf;
6722 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
6723 /* Brute force copy old sctp opt. */
6724 inet_sk_copy_descendant(newsk, oldsk);
6726 /* Restore the ep value that was overwritten with the above structure
6727 * copy.
6729 newsp->ep = newep;
6730 newsp->hmac = NULL;
6732 /* Hook this new socket in to the bind_hash list. */
6733 head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->num)];
6734 sctp_local_bh_disable();
6735 sctp_spin_lock(&head->lock);
6736 pp = sctp_sk(oldsk)->bind_hash;
6737 sk_add_bind_node(newsk, &pp->owner);
6738 sctp_sk(newsk)->bind_hash = pp;
6739 inet_sk(newsk)->num = inet_sk(oldsk)->num;
6740 sctp_spin_unlock(&head->lock);
6741 sctp_local_bh_enable();
6743 /* Copy the bind_addr list from the original endpoint to the new
6744 * endpoint so that we can handle restarts properly
6746 sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
6747 &oldsp->ep->base.bind_addr, GFP_KERNEL);
6749 /* Move any messages in the old socket's receive queue that are for the
6750 * peeled off association to the new socket's receive queue.
6752 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
6753 event = sctp_skb2event(skb);
6754 if (event->asoc == assoc) {
6755 sctp_sock_rfree_frag(skb);
6756 __skb_unlink(skb, &oldsk->sk_receive_queue);
6757 __skb_queue_tail(&newsk->sk_receive_queue, skb);
6758 sctp_skb_set_owner_r_frag(skb, newsk);
6762 /* Clean up any messages pending delivery due to partial
6763 * delivery. Three cases:
6764 * 1) No partial deliver; no work.
6765 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
6766 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
6768 skb_queue_head_init(&newsp->pd_lobby);
6769 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
6771 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
6772 struct sk_buff_head *queue;
6774 /* Decide which queue to move pd_lobby skbs to. */
6775 if (assoc->ulpq.pd_mode) {
6776 queue = &newsp->pd_lobby;
6777 } else
6778 queue = &newsk->sk_receive_queue;
6780 /* Walk through the pd_lobby, looking for skbs that
6781 * need moved to the new socket.
6783 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
6784 event = sctp_skb2event(skb);
6785 if (event->asoc == assoc) {
6786 sctp_sock_rfree_frag(skb);
6787 __skb_unlink(skb, &oldsp->pd_lobby);
6788 __skb_queue_tail(queue, skb);
6789 sctp_skb_set_owner_r_frag(skb, newsk);
6793 /* Clear up any skbs waiting for the partial
6794 * delivery to finish.
6796 if (assoc->ulpq.pd_mode)
6797 sctp_clear_pd(oldsk, NULL);
6801 sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp) {
6802 sctp_sock_rfree_frag(skb);
6803 sctp_skb_set_owner_r_frag(skb, newsk);
6806 sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp) {
6807 sctp_sock_rfree_frag(skb);
6808 sctp_skb_set_owner_r_frag(skb, newsk);
6811 /* Set the type of socket to indicate that it is peeled off from the
6812 * original UDP-style socket or created with the accept() call on a
6813 * TCP-style socket..
6815 newsp->type = type;
6817 /* Mark the new socket "in-use" by the user so that any packets
6818 * that may arrive on the association after we've moved it are
6819 * queued to the backlog. This prevents a potential race between
6820 * backlog processing on the old socket and new-packet processing
6821 * on the new socket.
6823 * The caller has just allocated newsk so we can guarantee that other
6824 * paths won't try to lock it and then oldsk.
6826 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
6827 sctp_assoc_migrate(assoc, newsk);
6829 /* If the association on the newsk is already closed before accept()
6830 * is called, set RCV_SHUTDOWN flag.
6832 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
6833 newsk->sk_shutdown |= RCV_SHUTDOWN;
6835 newsk->sk_state = SCTP_SS_ESTABLISHED;
6836 sctp_release_sock(newsk);
6840 /* This proto struct describes the ULP interface for SCTP. */
6841 struct proto sctp_prot = {
6842 .name = "SCTP",
6843 .owner = THIS_MODULE,
6844 .close = sctp_close,
6845 .connect = sctp_connect,
6846 .disconnect = sctp_disconnect,
6847 .accept = sctp_accept,
6848 .ioctl = sctp_ioctl,
6849 .init = sctp_init_sock,
6850 .destroy = sctp_destroy_sock,
6851 .shutdown = sctp_shutdown,
6852 .setsockopt = sctp_setsockopt,
6853 .getsockopt = sctp_getsockopt,
6854 .sendmsg = sctp_sendmsg,
6855 .recvmsg = sctp_recvmsg,
6856 .bind = sctp_bind,
6857 .backlog_rcv = sctp_backlog_rcv,
6858 .hash = sctp_hash,
6859 .unhash = sctp_unhash,
6860 .get_port = sctp_get_port,
6861 .obj_size = sizeof(struct sctp_sock),
6862 .sysctl_mem = sysctl_sctp_mem,
6863 .sysctl_rmem = sysctl_sctp_rmem,
6864 .sysctl_wmem = sysctl_sctp_wmem,
6865 .memory_pressure = &sctp_memory_pressure,
6866 .enter_memory_pressure = sctp_enter_memory_pressure,
6867 .memory_allocated = &sctp_memory_allocated,
6868 .sockets_allocated = &sctp_sockets_allocated,
6871 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
6873 struct proto sctpv6_prot = {
6874 .name = "SCTPv6",
6875 .owner = THIS_MODULE,
6876 .close = sctp_close,
6877 .connect = sctp_connect,
6878 .disconnect = sctp_disconnect,
6879 .accept = sctp_accept,
6880 .ioctl = sctp_ioctl,
6881 .init = sctp_init_sock,
6882 .destroy = sctp_destroy_sock,
6883 .shutdown = sctp_shutdown,
6884 .setsockopt = sctp_setsockopt,
6885 .getsockopt = sctp_getsockopt,
6886 .sendmsg = sctp_sendmsg,
6887 .recvmsg = sctp_recvmsg,
6888 .bind = sctp_bind,
6889 .backlog_rcv = sctp_backlog_rcv,
6890 .hash = sctp_hash,
6891 .unhash = sctp_unhash,
6892 .get_port = sctp_get_port,
6893 .obj_size = sizeof(struct sctp6_sock),
6894 .sysctl_mem = sysctl_sctp_mem,
6895 .sysctl_rmem = sysctl_sctp_rmem,
6896 .sysctl_wmem = sysctl_sctp_wmem,
6897 .memory_pressure = &sctp_memory_pressure,
6898 .enter_memory_pressure = sctp_enter_memory_pressure,
6899 .memory_allocated = &sctp_memory_allocated,
6900 .sockets_allocated = &sctp_sockets_allocated,
6902 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */