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TOMOYO Linux Cross Reference
Linux/net/sctp/socket.c

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  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
  8  *
  9  * This file is part of the SCTP kernel implementation
 10  *
 11  * These functions interface with the sockets layer to implement the
 12  * SCTP Extensions for the Sockets API.
 13  *
 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.
 17  *
 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.
 23  *
 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.
 29  *
 30  * You should have received a copy of the GNU General Public License
 31  * along with GNU CC; see the file COPYING.  If not, see
 32  * <http://www.gnu.org/licenses/>.
 33  *
 34  * Please send any bug reports or fixes you make to the
 35  * email address(es):
 36  *    lksctp developers <linux-sctp@vger.kernel.org>
 37  *
 38  * Written or modified by:
 39  *    La Monte H.P. Yarroll <piggy@acm.org>
 40  *    Narasimha Budihal     <narsi@refcode.org>
 41  *    Karl Knutson          <karl@athena.chicago.il.us>
 42  *    Jon Grimm             <jgrimm@us.ibm.com>
 43  *    Xingang Guo           <xingang.guo@intel.com>
 44  *    Daisy Chang           <daisyc@us.ibm.com>
 45  *    Sridhar Samudrala     <samudrala@us.ibm.com>
 46  *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
 47  *    Ardelle Fan           <ardelle.fan@intel.com>
 48  *    Ryan Layer            <rmlayer@us.ibm.com>
 49  *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
 50  *    Kevin Gao             <kevin.gao@intel.com>
 51  */
 52 
 53 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 54 
 55 #include <crypto/hash.h>
 56 #include <linux/types.h>
 57 #include <linux/kernel.h>
 58 #include <linux/wait.h>
 59 #include <linux/time.h>
 60 #include <linux/sched/signal.h>
 61 #include <linux/ip.h>
 62 #include <linux/capability.h>
 63 #include <linux/fcntl.h>
 64 #include <linux/poll.h>
 65 #include <linux/init.h>
 66 #include <linux/slab.h>
 67 #include <linux/file.h>
 68 #include <linux/compat.h>
 69 #include <linux/rhashtable.h>
 70 
 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>
 76 #include <net/busy_poll.h>
 77 
 78 #include <linux/socket.h> /* for sa_family_t */
 79 #include <linux/export.h>
 80 #include <net/sock.h>
 81 #include <net/sctp/sctp.h>
 82 #include <net/sctp/sm.h>
 83 #include <net/sctp/stream_sched.h>
 84 
 85 /* Forward declarations for internal helper functions. */
 86 static bool sctp_writeable(struct sock *sk);
 87 static void sctp_wfree(struct sk_buff *skb);
 88 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
 89                                 size_t msg_len);
 90 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
 91 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
 92 static int sctp_wait_for_accept(struct sock *sk, long timeo);
 93 static void sctp_wait_for_close(struct sock *sk, long timeo);
 94 static void sctp_destruct_sock(struct sock *sk);
 95 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 96                                         union sctp_addr *addr, int len);
 97 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
 98 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
 99 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf(struct sctp_association *asoc,
102                             struct sctp_chunk *chunk);
103 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
104 static int sctp_autobind(struct sock *sk);
105 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
106                              struct sctp_association *assoc,
107                              enum sctp_socket_type type);
108 
109 static unsigned long sctp_memory_pressure;
110 static atomic_long_t sctp_memory_allocated;
111 struct percpu_counter sctp_sockets_allocated;
112 
113 static void sctp_enter_memory_pressure(struct sock *sk)
114 {
115         sctp_memory_pressure = 1;
116 }
117 
118 
119 /* Get the sndbuf space available at the time on the association.  */
120 static inline int sctp_wspace(struct sctp_association *asoc)
121 {
122         struct sock *sk = asoc->base.sk;
123 
124         return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
125                                        : sk_stream_wspace(sk);
126 }
127 
128 /* Increment the used sndbuf space count of the corresponding association by
129  * the size of the outgoing data chunk.
130  * Also, set the skb destructor for sndbuf accounting later.
131  *
132  * Since it is always 1-1 between chunk and skb, and also a new skb is always
133  * allocated for chunk bundling in sctp_packet_transmit(), we can use the
134  * destructor in the data chunk skb for the purpose of the sndbuf space
135  * tracking.
136  */
137 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
138 {
139         struct sctp_association *asoc = chunk->asoc;
140         struct sock *sk = asoc->base.sk;
141 
142         /* The sndbuf space is tracked per association.  */
143         sctp_association_hold(asoc);
144 
145         if (chunk->shkey)
146                 sctp_auth_shkey_hold(chunk->shkey);
147 
148         skb_set_owner_w(chunk->skb, sk);
149 
150         chunk->skb->destructor = sctp_wfree;
151         /* Save the chunk pointer in skb for sctp_wfree to use later.  */
152         skb_shinfo(chunk->skb)->destructor_arg = chunk;
153 
154         refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
155         asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
156         sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
157         sk_mem_charge(sk, chunk->skb->truesize);
158 }
159 
160 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
161 {
162         skb_orphan(chunk->skb);
163 }
164 
165 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
166                                        void (*cb)(struct sctp_chunk *))
167 
168 {
169         struct sctp_outq *q = &asoc->outqueue;
170         struct sctp_transport *t;
171         struct sctp_chunk *chunk;
172 
173         list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174                 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
175                         cb(chunk);
176 
177         list_for_each_entry(chunk, &q->retransmit, transmitted_list)
178                 cb(chunk);
179 
180         list_for_each_entry(chunk, &q->sacked, transmitted_list)
181                 cb(chunk);
182 
183         list_for_each_entry(chunk, &q->abandoned, transmitted_list)
184                 cb(chunk);
185 
186         list_for_each_entry(chunk, &q->out_chunk_list, list)
187                 cb(chunk);
188 }
189 
190 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
191                                  void (*cb)(struct sk_buff *, struct sock *))
192 
193 {
194         struct sk_buff *skb, *tmp;
195 
196         sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
197                 cb(skb, sk);
198 
199         sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
200                 cb(skb, sk);
201 
202         sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
203                 cb(skb, sk);
204 }
205 
206 /* Verify that this is a valid address. */
207 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
208                                    int len)
209 {
210         struct sctp_af *af;
211 
212         /* Verify basic sockaddr. */
213         af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
214         if (!af)
215                 return -EINVAL;
216 
217         /* Is this a valid SCTP address?  */
218         if (!af->addr_valid(addr, sctp_sk(sk), NULL))
219                 return -EINVAL;
220 
221         if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
222                 return -EINVAL;
223 
224         return 0;
225 }
226 
227 /* Look up the association by its id.  If this is not a UDP-style
228  * socket, the ID field is always ignored.
229  */
230 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
231 {
232         struct sctp_association *asoc = NULL;
233 
234         /* If this is not a UDP-style socket, assoc id should be ignored. */
235         if (!sctp_style(sk, UDP)) {
236                 /* Return NULL if the socket state is not ESTABLISHED. It
237                  * could be a TCP-style listening socket or a socket which
238                  * hasn't yet called connect() to establish an association.
239                  */
240                 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
241                         return NULL;
242 
243                 /* Get the first and the only association from the list. */
244                 if (!list_empty(&sctp_sk(sk)->ep->asocs))
245                         asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
246                                           struct sctp_association, asocs);
247                 return asoc;
248         }
249 
250         /* Otherwise this is a UDP-style socket. */
251         if (id <= SCTP_ALL_ASSOC)
252                 return NULL;
253 
254         spin_lock_bh(&sctp_assocs_id_lock);
255         asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
256         if (asoc && (asoc->base.sk != sk || asoc->base.dead))
257                 asoc = NULL;
258         spin_unlock_bh(&sctp_assocs_id_lock);
259 
260         return asoc;
261 }
262 
263 /* Look up the transport from an address and an assoc id. If both address and
264  * id are specified, the associations matching the address and the id should be
265  * the same.
266  */
267 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
268                                               struct sockaddr_storage *addr,
269                                               sctp_assoc_t id)
270 {
271         struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
272         struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
273         union sctp_addr *laddr = (union sctp_addr *)addr;
274         struct sctp_transport *transport;
275 
276         if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
277                 return NULL;
278 
279         addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
280                                                laddr,
281                                                &transport);
282 
283         if (!addr_asoc)
284                 return NULL;
285 
286         id_asoc = sctp_id2assoc(sk, id);
287         if (id_asoc && (id_asoc != addr_asoc))
288                 return NULL;
289 
290         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
291                                                 (union sctp_addr *)addr);
292 
293         return transport;
294 }
295 
296 /* API 3.1.2 bind() - UDP Style Syntax
297  * The syntax of bind() is,
298  *
299  *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
300  *
301  *   sd      - the socket descriptor returned by socket().
302  *   addr    - the address structure (struct sockaddr_in or struct
303  *             sockaddr_in6 [RFC 2553]),
304  *   addr_len - the size of the address structure.
305  */
306 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
307 {
308         int retval = 0;
309 
310         lock_sock(sk);
311 
312         pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
313                  addr, addr_len);
314 
315         /* Disallow binding twice. */
316         if (!sctp_sk(sk)->ep->base.bind_addr.port)
317                 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
318                                       addr_len);
319         else
320                 retval = -EINVAL;
321 
322         release_sock(sk);
323 
324         return retval;
325 }
326 
327 static long sctp_get_port_local(struct sock *, union sctp_addr *);
328 
329 /* Verify this is a valid sockaddr. */
330 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
331                                         union sctp_addr *addr, int len)
332 {
333         struct sctp_af *af;
334 
335         /* Check minimum size.  */
336         if (len < sizeof (struct sockaddr))
337                 return NULL;
338 
339         if (!opt->pf->af_supported(addr->sa.sa_family, opt))
340                 return NULL;
341 
342         if (addr->sa.sa_family == AF_INET6) {
343                 if (len < SIN6_LEN_RFC2133)
344                         return NULL;
345                 /* V4 mapped address are really of AF_INET family */
346                 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
347                     !opt->pf->af_supported(AF_INET, opt))
348                         return NULL;
349         }
350 
351         /* If we get this far, af is valid. */
352         af = sctp_get_af_specific(addr->sa.sa_family);
353 
354         if (len < af->sockaddr_len)
355                 return NULL;
356 
357         return af;
358 }
359 
360 /* Bind a local address either to an endpoint or to an association.  */
361 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
362 {
363         struct net *net = sock_net(sk);
364         struct sctp_sock *sp = sctp_sk(sk);
365         struct sctp_endpoint *ep = sp->ep;
366         struct sctp_bind_addr *bp = &ep->base.bind_addr;
367         struct sctp_af *af;
368         unsigned short snum;
369         int ret = 0;
370 
371         /* Common sockaddr verification. */
372         af = sctp_sockaddr_af(sp, addr, len);
373         if (!af) {
374                 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
375                          __func__, sk, addr, len);
376                 return -EINVAL;
377         }
378 
379         snum = ntohs(addr->v4.sin_port);
380 
381         pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
382                  __func__, sk, &addr->sa, bp->port, snum, len);
383 
384         /* PF specific bind() address verification. */
385         if (!sp->pf->bind_verify(sp, addr))
386                 return -EADDRNOTAVAIL;
387 
388         /* We must either be unbound, or bind to the same port.
389          * It's OK to allow 0 ports if we are already bound.
390          * We'll just inhert an already bound port in this case
391          */
392         if (bp->port) {
393                 if (!snum)
394                         snum = bp->port;
395                 else if (snum != bp->port) {
396                         pr_debug("%s: new port %d doesn't match existing port "
397                                  "%d\n", __func__, snum, bp->port);
398                         return -EINVAL;
399                 }
400         }
401 
402         if (snum && snum < inet_prot_sock(net) &&
403             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
404                 return -EACCES;
405 
406         /* See if the address matches any of the addresses we may have
407          * already bound before checking against other endpoints.
408          */
409         if (sctp_bind_addr_match(bp, addr, sp))
410                 return -EINVAL;
411 
412         /* Make sure we are allowed to bind here.
413          * The function sctp_get_port_local() does duplicate address
414          * detection.
415          */
416         addr->v4.sin_port = htons(snum);
417         if ((ret = sctp_get_port_local(sk, addr))) {
418                 return -EADDRINUSE;
419         }
420 
421         /* Refresh ephemeral port.  */
422         if (!bp->port)
423                 bp->port = inet_sk(sk)->inet_num;
424 
425         /* Add the address to the bind address list.
426          * Use GFP_ATOMIC since BHs will be disabled.
427          */
428         ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
429                                  SCTP_ADDR_SRC, GFP_ATOMIC);
430 
431         /* Copy back into socket for getsockname() use. */
432         if (!ret) {
433                 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
434                 sp->pf->to_sk_saddr(addr, sk);
435         }
436 
437         return ret;
438 }
439 
440  /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
441  *
442  * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
443  * at any one time.  If a sender, after sending an ASCONF chunk, decides
444  * it needs to transfer another ASCONF Chunk, it MUST wait until the
445  * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
446  * subsequent ASCONF. Note this restriction binds each side, so at any
447  * time two ASCONF may be in-transit on any given association (one sent
448  * from each endpoint).
449  */
450 static int sctp_send_asconf(struct sctp_association *asoc,
451                             struct sctp_chunk *chunk)
452 {
453         struct net      *net = sock_net(asoc->base.sk);
454         int             retval = 0;
455 
456         /* If there is an outstanding ASCONF chunk, queue it for later
457          * transmission.
458          */
459         if (asoc->addip_last_asconf) {
460                 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
461                 goto out;
462         }
463 
464         /* Hold the chunk until an ASCONF_ACK is received. */
465         sctp_chunk_hold(chunk);
466         retval = sctp_primitive_ASCONF(net, asoc, chunk);
467         if (retval)
468                 sctp_chunk_free(chunk);
469         else
470                 asoc->addip_last_asconf = chunk;
471 
472 out:
473         return retval;
474 }
475 
476 /* Add a list of addresses as bind addresses to local endpoint or
477  * association.
478  *
479  * Basically run through each address specified in the addrs/addrcnt
480  * array/length pair, determine if it is IPv6 or IPv4 and call
481  * sctp_do_bind() on it.
482  *
483  * If any of them fails, then the operation will be reversed and the
484  * ones that were added will be removed.
485  *
486  * Only sctp_setsockopt_bindx() is supposed to call this function.
487  */
488 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
489 {
490         int cnt;
491         int retval = 0;
492         void *addr_buf;
493         struct sockaddr *sa_addr;
494         struct sctp_af *af;
495 
496         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
497                  addrs, addrcnt);
498 
499         addr_buf = addrs;
500         for (cnt = 0; cnt < addrcnt; cnt++) {
501                 /* The list may contain either IPv4 or IPv6 address;
502                  * determine the address length for walking thru the list.
503                  */
504                 sa_addr = addr_buf;
505                 af = sctp_get_af_specific(sa_addr->sa_family);
506                 if (!af) {
507                         retval = -EINVAL;
508                         goto err_bindx_add;
509                 }
510 
511                 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
512                                       af->sockaddr_len);
513 
514                 addr_buf += af->sockaddr_len;
515 
516 err_bindx_add:
517                 if (retval < 0) {
518                         /* Failed. Cleanup the ones that have been added */
519                         if (cnt > 0)
520                                 sctp_bindx_rem(sk, addrs, cnt);
521                         return retval;
522                 }
523         }
524 
525         return retval;
526 }
527 
528 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
529  * associations that are part of the endpoint indicating that a list of local
530  * addresses are added to the endpoint.
531  *
532  * If any of the addresses is already in the bind address list of the
533  * association, we do not send the chunk for that association.  But it will not
534  * affect other associations.
535  *
536  * Only sctp_setsockopt_bindx() is supposed to call this function.
537  */
538 static int sctp_send_asconf_add_ip(struct sock          *sk,
539                                    struct sockaddr      *addrs,
540                                    int                  addrcnt)
541 {
542         struct net *net = sock_net(sk);
543         struct sctp_sock                *sp;
544         struct sctp_endpoint            *ep;
545         struct sctp_association         *asoc;
546         struct sctp_bind_addr           *bp;
547         struct sctp_chunk               *chunk;
548         struct sctp_sockaddr_entry      *laddr;
549         union sctp_addr                 *addr;
550         union sctp_addr                 saveaddr;
551         void                            *addr_buf;
552         struct sctp_af                  *af;
553         struct list_head                *p;
554         int                             i;
555         int                             retval = 0;
556 
557         if (!net->sctp.addip_enable)
558                 return retval;
559 
560         sp = sctp_sk(sk);
561         ep = sp->ep;
562 
563         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
564                  __func__, sk, addrs, addrcnt);
565 
566         list_for_each_entry(asoc, &ep->asocs, asocs) {
567                 if (!asoc->peer.asconf_capable)
568                         continue;
569 
570                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
571                         continue;
572 
573                 if (!sctp_state(asoc, ESTABLISHED))
574                         continue;
575 
576                 /* Check if any address in the packed array of addresses is
577                  * in the bind address list of the association. If so,
578                  * do not send the asconf chunk to its peer, but continue with
579                  * other associations.
580                  */
581                 addr_buf = addrs;
582                 for (i = 0; i < addrcnt; i++) {
583                         addr = addr_buf;
584                         af = sctp_get_af_specific(addr->v4.sin_family);
585                         if (!af) {
586                                 retval = -EINVAL;
587                                 goto out;
588                         }
589 
590                         if (sctp_assoc_lookup_laddr(asoc, addr))
591                                 break;
592 
593                         addr_buf += af->sockaddr_len;
594                 }
595                 if (i < addrcnt)
596                         continue;
597 
598                 /* Use the first valid address in bind addr list of
599                  * association as Address Parameter of ASCONF CHUNK.
600                  */
601                 bp = &asoc->base.bind_addr;
602                 p = bp->address_list.next;
603                 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
604                 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
605                                                    addrcnt, SCTP_PARAM_ADD_IP);
606                 if (!chunk) {
607                         retval = -ENOMEM;
608                         goto out;
609                 }
610 
611                 /* Add the new addresses to the bind address list with
612                  * use_as_src set to 0.
613                  */
614                 addr_buf = addrs;
615                 for (i = 0; i < addrcnt; i++) {
616                         addr = addr_buf;
617                         af = sctp_get_af_specific(addr->v4.sin_family);
618                         memcpy(&saveaddr, addr, af->sockaddr_len);
619                         retval = sctp_add_bind_addr(bp, &saveaddr,
620                                                     sizeof(saveaddr),
621                                                     SCTP_ADDR_NEW, GFP_ATOMIC);
622                         addr_buf += af->sockaddr_len;
623                 }
624                 if (asoc->src_out_of_asoc_ok) {
625                         struct sctp_transport *trans;
626 
627                         list_for_each_entry(trans,
628                             &asoc->peer.transport_addr_list, transports) {
629                                 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
630                                     2*asoc->pathmtu, 4380));
631                                 trans->ssthresh = asoc->peer.i.a_rwnd;
632                                 trans->rto = asoc->rto_initial;
633                                 sctp_max_rto(asoc, trans);
634                                 trans->rtt = trans->srtt = trans->rttvar = 0;
635                                 /* Clear the source and route cache */
636                                 sctp_transport_route(trans, NULL,
637                                                      sctp_sk(asoc->base.sk));
638                         }
639                 }
640                 retval = sctp_send_asconf(asoc, chunk);
641         }
642 
643 out:
644         return retval;
645 }
646 
647 /* Remove a list of addresses from bind addresses list.  Do not remove the
648  * last address.
649  *
650  * Basically run through each address specified in the addrs/addrcnt
651  * array/length pair, determine if it is IPv6 or IPv4 and call
652  * sctp_del_bind() on it.
653  *
654  * If any of them fails, then the operation will be reversed and the
655  * ones that were removed will be added back.
656  *
657  * At least one address has to be left; if only one address is
658  * available, the operation will return -EBUSY.
659  *
660  * Only sctp_setsockopt_bindx() is supposed to call this function.
661  */
662 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
663 {
664         struct sctp_sock *sp = sctp_sk(sk);
665         struct sctp_endpoint *ep = sp->ep;
666         int cnt;
667         struct sctp_bind_addr *bp = &ep->base.bind_addr;
668         int retval = 0;
669         void *addr_buf;
670         union sctp_addr *sa_addr;
671         struct sctp_af *af;
672 
673         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
674                  __func__, sk, addrs, addrcnt);
675 
676         addr_buf = addrs;
677         for (cnt = 0; cnt < addrcnt; cnt++) {
678                 /* If the bind address list is empty or if there is only one
679                  * bind address, there is nothing more to be removed (we need
680                  * at least one address here).
681                  */
682                 if (list_empty(&bp->address_list) ||
683                     (sctp_list_single_entry(&bp->address_list))) {
684                         retval = -EBUSY;
685                         goto err_bindx_rem;
686                 }
687 
688                 sa_addr = addr_buf;
689                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
690                 if (!af) {
691                         retval = -EINVAL;
692                         goto err_bindx_rem;
693                 }
694 
695                 if (!af->addr_valid(sa_addr, sp, NULL)) {
696                         retval = -EADDRNOTAVAIL;
697                         goto err_bindx_rem;
698                 }
699 
700                 if (sa_addr->v4.sin_port &&
701                     sa_addr->v4.sin_port != htons(bp->port)) {
702                         retval = -EINVAL;
703                         goto err_bindx_rem;
704                 }
705 
706                 if (!sa_addr->v4.sin_port)
707                         sa_addr->v4.sin_port = htons(bp->port);
708 
709                 /* FIXME - There is probably a need to check if sk->sk_saddr and
710                  * sk->sk_rcv_addr are currently set to one of the addresses to
711                  * be removed. This is something which needs to be looked into
712                  * when we are fixing the outstanding issues with multi-homing
713                  * socket routing and failover schemes. Refer to comments in
714                  * sctp_do_bind(). -daisy
715                  */
716                 retval = sctp_del_bind_addr(bp, sa_addr);
717 
718                 addr_buf += af->sockaddr_len;
719 err_bindx_rem:
720                 if (retval < 0) {
721                         /* Failed. Add the ones that has been removed back */
722                         if (cnt > 0)
723                                 sctp_bindx_add(sk, addrs, cnt);
724                         return retval;
725                 }
726         }
727 
728         return retval;
729 }
730 
731 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
732  * the associations that are part of the endpoint indicating that a list of
733  * local addresses are removed from the endpoint.
734  *
735  * If any of the addresses is already in the bind address list of the
736  * association, we do not send the chunk for that association.  But it will not
737  * affect other associations.
738  *
739  * Only sctp_setsockopt_bindx() is supposed to call this function.
740  */
741 static int sctp_send_asconf_del_ip(struct sock          *sk,
742                                    struct sockaddr      *addrs,
743                                    int                  addrcnt)
744 {
745         struct net *net = sock_net(sk);
746         struct sctp_sock        *sp;
747         struct sctp_endpoint    *ep;
748         struct sctp_association *asoc;
749         struct sctp_transport   *transport;
750         struct sctp_bind_addr   *bp;
751         struct sctp_chunk       *chunk;
752         union sctp_addr         *laddr;
753         void                    *addr_buf;
754         struct sctp_af          *af;
755         struct sctp_sockaddr_entry *saddr;
756         int                     i;
757         int                     retval = 0;
758         int                     stored = 0;
759 
760         chunk = NULL;
761         if (!net->sctp.addip_enable)
762                 return retval;
763 
764         sp = sctp_sk(sk);
765         ep = sp->ep;
766 
767         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
768                  __func__, sk, addrs, addrcnt);
769 
770         list_for_each_entry(asoc, &ep->asocs, asocs) {
771 
772                 if (!asoc->peer.asconf_capable)
773                         continue;
774 
775                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776                         continue;
777 
778                 if (!sctp_state(asoc, ESTABLISHED))
779                         continue;
780 
781                 /* Check if any address in the packed array of addresses is
782                  * not present in the bind address list of the association.
783                  * If so, do not send the asconf chunk to its peer, but
784                  * continue with other associations.
785                  */
786                 addr_buf = addrs;
787                 for (i = 0; i < addrcnt; i++) {
788                         laddr = addr_buf;
789                         af = sctp_get_af_specific(laddr->v4.sin_family);
790                         if (!af) {
791                                 retval = -EINVAL;
792                                 goto out;
793                         }
794 
795                         if (!sctp_assoc_lookup_laddr(asoc, laddr))
796                                 break;
797 
798                         addr_buf += af->sockaddr_len;
799                 }
800                 if (i < addrcnt)
801                         continue;
802 
803                 /* Find one address in the association's bind address list
804                  * that is not in the packed array of addresses. This is to
805                  * make sure that we do not delete all the addresses in the
806                  * association.
807                  */
808                 bp = &asoc->base.bind_addr;
809                 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
810                                                addrcnt, sp);
811                 if ((laddr == NULL) && (addrcnt == 1)) {
812                         if (asoc->asconf_addr_del_pending)
813                                 continue;
814                         asoc->asconf_addr_del_pending =
815                             kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
816                         if (asoc->asconf_addr_del_pending == NULL) {
817                                 retval = -ENOMEM;
818                                 goto out;
819                         }
820                         asoc->asconf_addr_del_pending->sa.sa_family =
821                                     addrs->sa_family;
822                         asoc->asconf_addr_del_pending->v4.sin_port =
823                                     htons(bp->port);
824                         if (addrs->sa_family == AF_INET) {
825                                 struct sockaddr_in *sin;
826 
827                                 sin = (struct sockaddr_in *)addrs;
828                                 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
829                         } else if (addrs->sa_family == AF_INET6) {
830                                 struct sockaddr_in6 *sin6;
831 
832                                 sin6 = (struct sockaddr_in6 *)addrs;
833                                 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834                         }
835 
836                         pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
837                                  __func__, asoc, &asoc->asconf_addr_del_pending->sa,
838                                  asoc->asconf_addr_del_pending);
839 
840                         asoc->src_out_of_asoc_ok = 1;
841                         stored = 1;
842                         goto skip_mkasconf;
843                 }
844 
845                 if (laddr == NULL)
846                         return -EINVAL;
847 
848                 /* We do not need RCU protection throughout this loop
849                  * because this is done under a socket lock from the
850                  * setsockopt call.
851                  */
852                 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
853                                                    SCTP_PARAM_DEL_IP);
854                 if (!chunk) {
855                         retval = -ENOMEM;
856                         goto out;
857                 }
858 
859 skip_mkasconf:
860                 /* Reset use_as_src flag for the addresses in the bind address
861                  * list that are to be deleted.
862                  */
863                 addr_buf = addrs;
864                 for (i = 0; i < addrcnt; i++) {
865                         laddr = addr_buf;
866                         af = sctp_get_af_specific(laddr->v4.sin_family);
867                         list_for_each_entry(saddr, &bp->address_list, list) {
868                                 if (sctp_cmp_addr_exact(&saddr->a, laddr))
869                                         saddr->state = SCTP_ADDR_DEL;
870                         }
871                         addr_buf += af->sockaddr_len;
872                 }
873 
874                 /* Update the route and saddr entries for all the transports
875                  * as some of the addresses in the bind address list are
876                  * about to be deleted and cannot be used as source addresses.
877                  */
878                 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
879                                         transports) {
880                         sctp_transport_route(transport, NULL,
881                                              sctp_sk(asoc->base.sk));
882                 }
883 
884                 if (stored)
885                         /* We don't need to transmit ASCONF */
886                         continue;
887                 retval = sctp_send_asconf(asoc, chunk);
888         }
889 out:
890         return retval;
891 }
892 
893 /* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
894 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
895 {
896         struct sock *sk = sctp_opt2sk(sp);
897         union sctp_addr *addr;
898         struct sctp_af *af;
899 
900         /* It is safe to write port space in caller. */
901         addr = &addrw->a;
902         addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
903         af = sctp_get_af_specific(addr->sa.sa_family);
904         if (!af)
905                 return -EINVAL;
906         if (sctp_verify_addr(sk, addr, af->sockaddr_len))
907                 return -EINVAL;
908 
909         if (addrw->state == SCTP_ADDR_NEW)
910                 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
911         else
912                 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
913 }
914 
915 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
916  *
917  * API 8.1
918  * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
919  *                int flags);
920  *
921  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
922  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
923  * or IPv6 addresses.
924  *
925  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
926  * Section 3.1.2 for this usage.
927  *
928  * addrs is a pointer to an array of one or more socket addresses. Each
929  * address is contained in its appropriate structure (i.e. struct
930  * sockaddr_in or struct sockaddr_in6) the family of the address type
931  * must be used to distinguish the address length (note that this
932  * representation is termed a "packed array" of addresses). The caller
933  * specifies the number of addresses in the array with addrcnt.
934  *
935  * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
936  * -1, and sets errno to the appropriate error code.
937  *
938  * For SCTP, the port given in each socket address must be the same, or
939  * sctp_bindx() will fail, setting errno to EINVAL.
940  *
941  * The flags parameter is formed from the bitwise OR of zero or more of
942  * the following currently defined flags:
943  *
944  * SCTP_BINDX_ADD_ADDR
945  *
946  * SCTP_BINDX_REM_ADDR
947  *
948  * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
949  * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
950  * addresses from the association. The two flags are mutually exclusive;
951  * if both are given, sctp_bindx() will fail with EINVAL. A caller may
952  * not remove all addresses from an association; sctp_bindx() will
953  * reject such an attempt with EINVAL.
954  *
955  * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
956  * additional addresses with an endpoint after calling bind().  Or use
957  * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
958  * socket is associated with so that no new association accepted will be
959  * associated with those addresses. If the endpoint supports dynamic
960  * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
961  * endpoint to send the appropriate message to the peer to change the
962  * peers address lists.
963  *
964  * Adding and removing addresses from a connected association is
965  * optional functionality. Implementations that do not support this
966  * functionality should return EOPNOTSUPP.
967  *
968  * Basically do nothing but copying the addresses from user to kernel
969  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
970  * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
971  * from userspace.
972  *
973  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
974  * it.
975  *
976  * sk        The sk of the socket
977  * addrs     The pointer to the addresses in user land
978  * addrssize Size of the addrs buffer
979  * op        Operation to perform (add or remove, see the flags of
980  *           sctp_bindx)
981  *
982  * Returns 0 if ok, <0 errno code on error.
983  */
984 static int sctp_setsockopt_bindx(struct sock *sk,
985                                  struct sockaddr __user *addrs,
986                                  int addrs_size, int op)
987 {
988         struct sockaddr *kaddrs;
989         int err;
990         int addrcnt = 0;
991         int walk_size = 0;
992         struct sockaddr *sa_addr;
993         void *addr_buf;
994         struct sctp_af *af;
995 
996         pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
997                  __func__, sk, addrs, addrs_size, op);
998 
999         if (unlikely(addrs_size <= 0))
1000                 return -EINVAL;
1001 
1002         kaddrs = memdup_user(addrs, addrs_size);
1003         if (unlikely(IS_ERR(kaddrs)))
1004                 return PTR_ERR(kaddrs);
1005 
1006         /* Walk through the addrs buffer and count the number of addresses. */
1007         addr_buf = kaddrs;
1008         while (walk_size < addrs_size) {
1009                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1010                         kfree(kaddrs);
1011                         return -EINVAL;
1012                 }
1013 
1014                 sa_addr = addr_buf;
1015                 af = sctp_get_af_specific(sa_addr->sa_family);
1016 
1017                 /* If the address family is not supported or if this address
1018                  * causes the address buffer to overflow return EINVAL.
1019                  */
1020                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1021                         kfree(kaddrs);
1022                         return -EINVAL;
1023                 }
1024                 addrcnt++;
1025                 addr_buf += af->sockaddr_len;
1026                 walk_size += af->sockaddr_len;
1027         }
1028 
1029         /* Do the work. */
1030         switch (op) {
1031         case SCTP_BINDX_ADD_ADDR:
1032                 /* Allow security module to validate bindx addresses. */
1033                 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1034                                                  (struct sockaddr *)kaddrs,
1035                                                  addrs_size);
1036                 if (err)
1037                         goto out;
1038                 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1039                 if (err)
1040                         goto out;
1041                 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1042                 break;
1043 
1044         case SCTP_BINDX_REM_ADDR:
1045                 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1046                 if (err)
1047                         goto out;
1048                 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1049                 break;
1050 
1051         default:
1052                 err = -EINVAL;
1053                 break;
1054         }
1055 
1056 out:
1057         kfree(kaddrs);
1058 
1059         return err;
1060 }
1061 
1062 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1063  *
1064  * Common routine for handling connect() and sctp_connectx().
1065  * Connect will come in with just a single address.
1066  */
1067 static int __sctp_connect(struct sock *sk,
1068                           struct sockaddr *kaddrs,
1069                           int addrs_size, int flags,
1070                           sctp_assoc_t *assoc_id)
1071 {
1072         struct net *net = sock_net(sk);
1073         struct sctp_sock *sp;
1074         struct sctp_endpoint *ep;
1075         struct sctp_association *asoc = NULL;
1076         struct sctp_association *asoc2;
1077         struct sctp_transport *transport;
1078         union sctp_addr to;
1079         enum sctp_scope scope;
1080         long timeo;
1081         int err = 0;
1082         int addrcnt = 0;
1083         int walk_size = 0;
1084         union sctp_addr *sa_addr = NULL;
1085         void *addr_buf;
1086         unsigned short port;
1087 
1088         sp = sctp_sk(sk);
1089         ep = sp->ep;
1090 
1091         /* connect() cannot be done on a socket that is already in ESTABLISHED
1092          * state - UDP-style peeled off socket or a TCP-style socket that
1093          * is already connected.
1094          * It cannot be done even on a TCP-style listening socket.
1095          */
1096         if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1097             (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1098                 err = -EISCONN;
1099                 goto out_free;
1100         }
1101 
1102         /* Walk through the addrs buffer and count the number of addresses. */
1103         addr_buf = kaddrs;
1104         while (walk_size < addrs_size) {
1105                 struct sctp_af *af;
1106 
1107                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1108                         err = -EINVAL;
1109                         goto out_free;
1110                 }
1111 
1112                 sa_addr = addr_buf;
1113                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1114 
1115                 /* If the address family is not supported or if this address
1116                  * causes the address buffer to overflow return EINVAL.
1117                  */
1118                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1119                         err = -EINVAL;
1120                         goto out_free;
1121                 }
1122 
1123                 port = ntohs(sa_addr->v4.sin_port);
1124 
1125                 /* Save current address so we can work with it */
1126                 memcpy(&to, sa_addr, af->sockaddr_len);
1127 
1128                 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1129                 if (err)
1130                         goto out_free;
1131 
1132                 /* Make sure the destination port is correctly set
1133                  * in all addresses.
1134                  */
1135                 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1136                         err = -EINVAL;
1137                         goto out_free;
1138                 }
1139 
1140                 /* Check if there already is a matching association on the
1141                  * endpoint (other than the one created here).
1142                  */
1143                 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1144                 if (asoc2 && asoc2 != asoc) {
1145                         if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1146                                 err = -EISCONN;
1147                         else
1148                                 err = -EALREADY;
1149                         goto out_free;
1150                 }
1151 
1152                 /* If we could not find a matching association on the endpoint,
1153                  * make sure that there is no peeled-off association matching
1154                  * the peer address even on another socket.
1155                  */
1156                 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1157                         err = -EADDRNOTAVAIL;
1158                         goto out_free;
1159                 }
1160 
1161                 if (!asoc) {
1162                         /* If a bind() or sctp_bindx() is not called prior to
1163                          * an sctp_connectx() call, the system picks an
1164                          * ephemeral port and will choose an address set
1165                          * equivalent to binding with a wildcard address.
1166                          */
1167                         if (!ep->base.bind_addr.port) {
1168                                 if (sctp_autobind(sk)) {
1169                                         err = -EAGAIN;
1170                                         goto out_free;
1171                                 }
1172                         } else {
1173                                 /*
1174                                  * If an unprivileged user inherits a 1-many
1175                                  * style socket with open associations on a
1176                                  * privileged port, it MAY be permitted to
1177                                  * accept new associations, but it SHOULD NOT
1178                                  * be permitted to open new associations.
1179                                  */
1180                                 if (ep->base.bind_addr.port <
1181                                     inet_prot_sock(net) &&
1182                                     !ns_capable(net->user_ns,
1183                                     CAP_NET_BIND_SERVICE)) {
1184                                         err = -EACCES;
1185                                         goto out_free;
1186                                 }
1187                         }
1188 
1189                         scope = sctp_scope(&to);
1190                         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1191                         if (!asoc) {
1192                                 err = -ENOMEM;
1193                                 goto out_free;
1194                         }
1195 
1196                         err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1197                                                               GFP_KERNEL);
1198                         if (err < 0) {
1199                                 goto out_free;
1200                         }
1201 
1202                 }
1203 
1204                 /* Prime the peer's transport structures.  */
1205                 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1206                                                 SCTP_UNKNOWN);
1207                 if (!transport) {
1208                         err = -ENOMEM;
1209                         goto out_free;
1210                 }
1211 
1212                 addrcnt++;
1213                 addr_buf += af->sockaddr_len;
1214                 walk_size += af->sockaddr_len;
1215         }
1216 
1217         /* In case the user of sctp_connectx() wants an association
1218          * id back, assign one now.
1219          */
1220         if (assoc_id) {
1221                 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1222                 if (err < 0)
1223                         goto out_free;
1224         }
1225 
1226         err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1227         if (err < 0) {
1228                 goto out_free;
1229         }
1230 
1231         /* Initialize sk's dport and daddr for getpeername() */
1232         inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1233         sp->pf->to_sk_daddr(sa_addr, sk);
1234         sk->sk_err = 0;
1235 
1236         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1237 
1238         if (assoc_id)
1239                 *assoc_id = asoc->assoc_id;
1240 
1241         err = sctp_wait_for_connect(asoc, &timeo);
1242         /* Note: the asoc may be freed after the return of
1243          * sctp_wait_for_connect.
1244          */
1245 
1246         /* Don't free association on exit. */
1247         asoc = NULL;
1248 
1249 out_free:
1250         pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251                  __func__, asoc, kaddrs, err);
1252 
1253         if (asoc) {
1254                 /* sctp_primitive_ASSOCIATE may have added this association
1255                  * To the hash table, try to unhash it, just in case, its a noop
1256                  * if it wasn't hashed so we're safe
1257                  */
1258                 sctp_association_free(asoc);
1259         }
1260         return err;
1261 }
1262 
1263 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1264  *
1265  * API 8.9
1266  * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1267  *                      sctp_assoc_t *asoc);
1268  *
1269  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1270  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1271  * or IPv6 addresses.
1272  *
1273  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1274  * Section 3.1.2 for this usage.
1275  *
1276  * addrs is a pointer to an array of one or more socket addresses. Each
1277  * address is contained in its appropriate structure (i.e. struct
1278  * sockaddr_in or struct sockaddr_in6) the family of the address type
1279  * must be used to distengish the address length (note that this
1280  * representation is termed a "packed array" of addresses). The caller
1281  * specifies the number of addresses in the array with addrcnt.
1282  *
1283  * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1284  * the association id of the new association.  On failure, sctp_connectx()
1285  * returns -1, and sets errno to the appropriate error code.  The assoc_id
1286  * is not touched by the kernel.
1287  *
1288  * For SCTP, the port given in each socket address must be the same, or
1289  * sctp_connectx() will fail, setting errno to EINVAL.
1290  *
1291  * An application can use sctp_connectx to initiate an association with
1292  * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1293  * allows a caller to specify multiple addresses at which a peer can be
1294  * reached.  The way the SCTP stack uses the list of addresses to set up
1295  * the association is implementation dependent.  This function only
1296  * specifies that the stack will try to make use of all the addresses in
1297  * the list when needed.
1298  *
1299  * Note that the list of addresses passed in is only used for setting up
1300  * the association.  It does not necessarily equal the set of addresses
1301  * the peer uses for the resulting association.  If the caller wants to
1302  * find out the set of peer addresses, it must use sctp_getpaddrs() to
1303  * retrieve them after the association has been set up.
1304  *
1305  * Basically do nothing but copying the addresses from user to kernel
1306  * land and invoking either sctp_connectx(). This is used for tunneling
1307  * the sctp_connectx() request through sctp_setsockopt() from userspace.
1308  *
1309  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1310  * it.
1311  *
1312  * sk        The sk of the socket
1313  * addrs     The pointer to the addresses in user land
1314  * addrssize Size of the addrs buffer
1315  *
1316  * Returns >=0 if ok, <0 errno code on error.
1317  */
1318 static int __sctp_setsockopt_connectx(struct sock *sk,
1319                                       struct sockaddr __user *addrs,
1320                                       int addrs_size,
1321                                       sctp_assoc_t *assoc_id)
1322 {
1323         struct sockaddr *kaddrs;
1324         int err = 0, flags = 0;
1325 
1326         pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1327                  __func__, sk, addrs, addrs_size);
1328 
1329         if (unlikely(addrs_size <= 0))
1330                 return -EINVAL;
1331 
1332         kaddrs = memdup_user(addrs, addrs_size);
1333         if (unlikely(IS_ERR(kaddrs)))
1334                 return PTR_ERR(kaddrs);
1335 
1336         /* Allow security module to validate connectx addresses. */
1337         err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1338                                          (struct sockaddr *)kaddrs,
1339                                           addrs_size);
1340         if (err)
1341                 goto out_free;
1342 
1343         /* in-kernel sockets don't generally have a file allocated to them
1344          * if all they do is call sock_create_kern().
1345          */
1346         if (sk->sk_socket->file)
1347                 flags = sk->sk_socket->file->f_flags;
1348 
1349         err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1350 
1351 out_free:
1352         kfree(kaddrs);
1353 
1354         return err;
1355 }
1356 
1357 /*
1358  * This is an older interface.  It's kept for backward compatibility
1359  * to the option that doesn't provide association id.
1360  */
1361 static int sctp_setsockopt_connectx_old(struct sock *sk,
1362                                         struct sockaddr __user *addrs,
1363                                         int addrs_size)
1364 {
1365         return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1366 }
1367 
1368 /*
1369  * New interface for the API.  The since the API is done with a socket
1370  * option, to make it simple we feed back the association id is as a return
1371  * indication to the call.  Error is always negative and association id is
1372  * always positive.
1373  */
1374 static int sctp_setsockopt_connectx(struct sock *sk,
1375                                     struct sockaddr __user *addrs,
1376                                     int addrs_size)
1377 {
1378         sctp_assoc_t assoc_id = 0;
1379         int err = 0;
1380 
1381         err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1382 
1383         if (err)
1384                 return err;
1385         else
1386                 return assoc_id;
1387 }
1388 
1389 /*
1390  * New (hopefully final) interface for the API.
1391  * We use the sctp_getaddrs_old structure so that use-space library
1392  * can avoid any unnecessary allocations. The only different part
1393  * is that we store the actual length of the address buffer into the
1394  * addrs_num structure member. That way we can re-use the existing
1395  * code.
1396  */
1397 #ifdef CONFIG_COMPAT
1398 struct compat_sctp_getaddrs_old {
1399         sctp_assoc_t    assoc_id;
1400         s32             addr_num;
1401         compat_uptr_t   addrs;          /* struct sockaddr * */
1402 };
1403 #endif
1404 
1405 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1406                                      char __user *optval,
1407                                      int __user *optlen)
1408 {
1409         struct sctp_getaddrs_old param;
1410         sctp_assoc_t assoc_id = 0;
1411         int err = 0;
1412 
1413 #ifdef CONFIG_COMPAT
1414         if (in_compat_syscall()) {
1415                 struct compat_sctp_getaddrs_old param32;
1416 
1417                 if (len < sizeof(param32))
1418                         return -EINVAL;
1419                 if (copy_from_user(&param32, optval, sizeof(param32)))
1420                         return -EFAULT;
1421 
1422                 param.assoc_id = param32.assoc_id;
1423                 param.addr_num = param32.addr_num;
1424                 param.addrs = compat_ptr(param32.addrs);
1425         } else
1426 #endif
1427         {
1428                 if (len < sizeof(param))
1429                         return -EINVAL;
1430                 if (copy_from_user(&param, optval, sizeof(param)))
1431                         return -EFAULT;
1432         }
1433 
1434         err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1435                                          param.addrs, param.addr_num,
1436                                          &assoc_id);
1437         if (err == 0 || err == -EINPROGRESS) {
1438                 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1439                         return -EFAULT;
1440                 if (put_user(sizeof(assoc_id), optlen))
1441                         return -EFAULT;
1442         }
1443 
1444         return err;
1445 }
1446 
1447 /* API 3.1.4 close() - UDP Style Syntax
1448  * Applications use close() to perform graceful shutdown (as described in
1449  * Section 10.1 of [SCTP]) on ALL the associations currently represented
1450  * by a UDP-style socket.
1451  *
1452  * The syntax is
1453  *
1454  *   ret = close(int sd);
1455  *
1456  *   sd      - the socket descriptor of the associations to be closed.
1457  *
1458  * To gracefully shutdown a specific association represented by the
1459  * UDP-style socket, an application should use the sendmsg() call,
1460  * passing no user data, but including the appropriate flag in the
1461  * ancillary data (see Section xxxx).
1462  *
1463  * If sd in the close() call is a branched-off socket representing only
1464  * one association, the shutdown is performed on that association only.
1465  *
1466  * 4.1.6 close() - TCP Style Syntax
1467  *
1468  * Applications use close() to gracefully close down an association.
1469  *
1470  * The syntax is:
1471  *
1472  *    int close(int sd);
1473  *
1474  *      sd      - the socket descriptor of the association to be closed.
1475  *
1476  * After an application calls close() on a socket descriptor, no further
1477  * socket operations will succeed on that descriptor.
1478  *
1479  * API 7.1.4 SO_LINGER
1480  *
1481  * An application using the TCP-style socket can use this option to
1482  * perform the SCTP ABORT primitive.  The linger option structure is:
1483  *
1484  *  struct  linger {
1485  *     int     l_onoff;                // option on/off
1486  *     int     l_linger;               // linger time
1487  * };
1488  *
1489  * To enable the option, set l_onoff to 1.  If the l_linger value is set
1490  * to 0, calling close() is the same as the ABORT primitive.  If the
1491  * value is set to a negative value, the setsockopt() call will return
1492  * an error.  If the value is set to a positive value linger_time, the
1493  * close() can be blocked for at most linger_time ms.  If the graceful
1494  * shutdown phase does not finish during this period, close() will
1495  * return but the graceful shutdown phase continues in the system.
1496  */
1497 static void sctp_close(struct sock *sk, long timeout)
1498 {
1499         struct net *net = sock_net(sk);
1500         struct sctp_endpoint *ep;
1501         struct sctp_association *asoc;
1502         struct list_head *pos, *temp;
1503         unsigned int data_was_unread;
1504 
1505         pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1506 
1507         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1508         sk->sk_shutdown = SHUTDOWN_MASK;
1509         inet_sk_set_state(sk, SCTP_SS_CLOSING);
1510 
1511         ep = sctp_sk(sk)->ep;
1512 
1513         /* Clean up any skbs sitting on the receive queue.  */
1514         data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1515         data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1516 
1517         /* Walk all associations on an endpoint.  */
1518         list_for_each_safe(pos, temp, &ep->asocs) {
1519                 asoc = list_entry(pos, struct sctp_association, asocs);
1520 
1521                 if (sctp_style(sk, TCP)) {
1522                         /* A closed association can still be in the list if
1523                          * it belongs to a TCP-style listening socket that is
1524                          * not yet accepted. If so, free it. If not, send an
1525                          * ABORT or SHUTDOWN based on the linger options.
1526                          */
1527                         if (sctp_state(asoc, CLOSED)) {
1528                                 sctp_association_free(asoc);
1529                                 continue;
1530                         }
1531                 }
1532 
1533                 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1534                     !skb_queue_empty(&asoc->ulpq.reasm) ||
1535                     !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1536                     (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1537                         struct sctp_chunk *chunk;
1538 
1539                         chunk = sctp_make_abort_user(asoc, NULL, 0);
1540                         sctp_primitive_ABORT(net, asoc, chunk);
1541                 } else
1542                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
1543         }
1544 
1545         /* On a TCP-style socket, block for at most linger_time if set. */
1546         if (sctp_style(sk, TCP) && timeout)
1547                 sctp_wait_for_close(sk, timeout);
1548 
1549         /* This will run the backlog queue.  */
1550         release_sock(sk);
1551 
1552         /* Supposedly, no process has access to the socket, but
1553          * the net layers still may.
1554          * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1555          * held and that should be grabbed before socket lock.
1556          */
1557         spin_lock_bh(&net->sctp.addr_wq_lock);
1558         bh_lock_sock_nested(sk);
1559 
1560         /* Hold the sock, since sk_common_release() will put sock_put()
1561          * and we have just a little more cleanup.
1562          */
1563         sock_hold(sk);
1564         sk_common_release(sk);
1565 
1566         bh_unlock_sock(sk);
1567         spin_unlock_bh(&net->sctp.addr_wq_lock);
1568 
1569         sock_put(sk);
1570 
1571         SCTP_DBG_OBJCNT_DEC(sock);
1572 }
1573 
1574 /* Handle EPIPE error. */
1575 static int sctp_error(struct sock *sk, int flags, int err)
1576 {
1577         if (err == -EPIPE)
1578                 err = sock_error(sk) ? : -EPIPE;
1579         if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1580                 send_sig(SIGPIPE, current, 0);
1581         return err;
1582 }
1583 
1584 /* API 3.1.3 sendmsg() - UDP Style Syntax
1585  *
1586  * An application uses sendmsg() and recvmsg() calls to transmit data to
1587  * and receive data from its peer.
1588  *
1589  *  ssize_t sendmsg(int socket, const struct msghdr *message,
1590  *                  int flags);
1591  *
1592  *  socket  - the socket descriptor of the endpoint.
1593  *  message - pointer to the msghdr structure which contains a single
1594  *            user message and possibly some ancillary data.
1595  *
1596  *            See Section 5 for complete description of the data
1597  *            structures.
1598  *
1599  *  flags   - flags sent or received with the user message, see Section
1600  *            5 for complete description of the flags.
1601  *
1602  * Note:  This function could use a rewrite especially when explicit
1603  * connect support comes in.
1604  */
1605 /* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1606 
1607 static int sctp_msghdr_parse(const struct msghdr *msg,
1608                              struct sctp_cmsgs *cmsgs);
1609 
1610 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1611                               struct sctp_sndrcvinfo *srinfo,
1612                               const struct msghdr *msg, size_t msg_len)
1613 {
1614         __u16 sflags;
1615         int err;
1616 
1617         if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1618                 return -EPIPE;
1619 
1620         if (msg_len > sk->sk_sndbuf)
1621                 return -EMSGSIZE;
1622 
1623         memset(cmsgs, 0, sizeof(*cmsgs));
1624         err = sctp_msghdr_parse(msg, cmsgs);
1625         if (err) {
1626                 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1627                 return err;
1628         }
1629 
1630         memset(srinfo, 0, sizeof(*srinfo));
1631         if (cmsgs->srinfo) {
1632                 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1633                 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1634                 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1635                 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1636                 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1637                 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1638         }
1639 
1640         if (cmsgs->sinfo) {
1641                 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1642                 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1643                 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1644                 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1645                 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1646         }
1647 
1648         if (cmsgs->prinfo) {
1649                 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1650                 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1651                                    cmsgs->prinfo->pr_policy);
1652         }
1653 
1654         sflags = srinfo->sinfo_flags;
1655         if (!sflags && msg_len)
1656                 return 0;
1657 
1658         if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1659                 return -EINVAL;
1660 
1661         if (((sflags & SCTP_EOF) && msg_len > 0) ||
1662             (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1663                 return -EINVAL;
1664 
1665         if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1666                 return -EINVAL;
1667 
1668         return 0;
1669 }
1670 
1671 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1672                                  struct sctp_cmsgs *cmsgs,
1673                                  union sctp_addr *daddr,
1674                                  struct sctp_transport **tp)
1675 {
1676         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1677         struct net *net = sock_net(sk);
1678         struct sctp_association *asoc;
1679         enum sctp_scope scope;
1680         struct cmsghdr *cmsg;
1681         __be32 flowinfo = 0;
1682         struct sctp_af *af;
1683         int err;
1684 
1685         *tp = NULL;
1686 
1687         if (sflags & (SCTP_EOF | SCTP_ABORT))
1688                 return -EINVAL;
1689 
1690         if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1691                                     sctp_sstate(sk, CLOSING)))
1692                 return -EADDRNOTAVAIL;
1693 
1694         if (sctp_endpoint_is_peeled_off(ep, daddr))
1695                 return -EADDRNOTAVAIL;
1696 
1697         if (!ep->base.bind_addr.port) {
1698                 if (sctp_autobind(sk))
1699                         return -EAGAIN;
1700         } else {
1701                 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1702                     !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1703                         return -EACCES;
1704         }
1705 
1706         scope = sctp_scope(daddr);
1707 
1708         /* Label connection socket for first association 1-to-many
1709          * style for client sequence socket()->sendmsg(). This
1710          * needs to be done before sctp_assoc_add_peer() as that will
1711          * set up the initial packet that needs to account for any
1712          * security ip options (CIPSO/CALIPSO) added to the packet.
1713          */
1714         af = sctp_get_af_specific(daddr->sa.sa_family);
1715         if (!af)
1716                 return -EINVAL;
1717         err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1718                                          (struct sockaddr *)daddr,
1719                                          af->sockaddr_len);
1720         if (err < 0)
1721                 return err;
1722 
1723         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1724         if (!asoc)
1725                 return -ENOMEM;
1726 
1727         if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1728                 err = -ENOMEM;
1729                 goto free;
1730         }
1731 
1732         if (cmsgs->init) {
1733                 struct sctp_initmsg *init = cmsgs->init;
1734 
1735                 if (init->sinit_num_ostreams) {
1736                         __u16 outcnt = init->sinit_num_ostreams;
1737 
1738                         asoc->c.sinit_num_ostreams = outcnt;
1739                         /* outcnt has been changed, need to re-init stream */
1740                         err = sctp_stream_init(&asoc->stream, outcnt, 0,
1741                                                GFP_KERNEL);
1742                         if (err)
1743                                 goto free;
1744                 }
1745 
1746                 if (init->sinit_max_instreams)
1747                         asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1748 
1749                 if (init->sinit_max_attempts)
1750                         asoc->max_init_attempts = init->sinit_max_attempts;
1751 
1752                 if (init->sinit_max_init_timeo)
1753                         asoc->max_init_timeo =
1754                                 msecs_to_jiffies(init->sinit_max_init_timeo);
1755         }
1756 
1757         *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1758         if (!*tp) {
1759                 err = -ENOMEM;
1760                 goto free;
1761         }
1762 
1763         if (!cmsgs->addrs_msg)
1764                 return 0;
1765 
1766         if (daddr->sa.sa_family == AF_INET6)
1767                 flowinfo = daddr->v6.sin6_flowinfo;
1768 
1769         /* sendv addr list parse */
1770         for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1771                 struct sctp_transport *transport;
1772                 struct sctp_association *old;
1773                 union sctp_addr _daddr;
1774                 int dlen;
1775 
1776                 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1777                     (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1778                      cmsg->cmsg_type != SCTP_DSTADDRV6))
1779                         continue;
1780 
1781                 daddr = &_daddr;
1782                 memset(daddr, 0, sizeof(*daddr));
1783                 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1784                 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1785                         if (dlen < sizeof(struct in_addr)) {
1786                                 err = -EINVAL;
1787                                 goto free;
1788                         }
1789 
1790                         dlen = sizeof(struct in_addr);
1791                         daddr->v4.sin_family = AF_INET;
1792                         daddr->v4.sin_port = htons(asoc->peer.port);
1793                         memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1794                 } else {
1795                         if (dlen < sizeof(struct in6_addr)) {
1796                                 err = -EINVAL;
1797                                 goto free;
1798                         }
1799 
1800                         dlen = sizeof(struct in6_addr);
1801                         daddr->v6.sin6_flowinfo = flowinfo;
1802                         daddr->v6.sin6_family = AF_INET6;
1803                         daddr->v6.sin6_port = htons(asoc->peer.port);
1804                         memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1805                 }
1806                 err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
1807                 if (err)
1808                         goto free;
1809 
1810                 old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1811                 if (old && old != asoc) {
1812                         if (old->state >= SCTP_STATE_ESTABLISHED)
1813                                 err = -EISCONN;
1814                         else
1815                                 err = -EALREADY;
1816                         goto free;
1817                 }
1818 
1819                 if (sctp_endpoint_is_peeled_off(ep, daddr)) {
1820                         err = -EADDRNOTAVAIL;
1821                         goto free;
1822                 }
1823 
1824                 transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
1825                                                 SCTP_UNKNOWN);
1826                 if (!transport) {
1827                         err = -ENOMEM;
1828                         goto free;
1829                 }
1830         }
1831 
1832         return 0;
1833 
1834 free:
1835         sctp_association_free(asoc);
1836         return err;
1837 }
1838 
1839 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1840                                      __u16 sflags, struct msghdr *msg,
1841                                      size_t msg_len)
1842 {
1843         struct sock *sk = asoc->base.sk;
1844         struct net *net = sock_net(sk);
1845 
1846         if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1847                 return -EPIPE;
1848 
1849         if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1850             !sctp_state(asoc, ESTABLISHED))
1851                 return 0;
1852 
1853         if (sflags & SCTP_EOF) {
1854                 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1855                 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1856 
1857                 return 0;
1858         }
1859 
1860         if (sflags & SCTP_ABORT) {
1861                 struct sctp_chunk *chunk;
1862 
1863                 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1864                 if (!chunk)
1865                         return -ENOMEM;
1866 
1867                 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1868                 sctp_primitive_ABORT(net, asoc, chunk);
1869                 iov_iter_revert(&msg->msg_iter, msg_len);
1870 
1871                 return 0;
1872         }
1873 
1874         return 1;
1875 }
1876 
1877 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1878                                 struct msghdr *msg, size_t msg_len,
1879                                 struct sctp_transport *transport,
1880                                 struct sctp_sndrcvinfo *sinfo)
1881 {
1882         struct sock *sk = asoc->base.sk;
1883         struct sctp_sock *sp = sctp_sk(sk);
1884         struct net *net = sock_net(sk);
1885         struct sctp_datamsg *datamsg;
1886         bool wait_connect = false;
1887         struct sctp_chunk *chunk;
1888         long timeo;
1889         int err;
1890 
1891         if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1892                 err = -EINVAL;
1893                 goto err;
1894         }
1895 
1896         if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1897                 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1898                 if (err)
1899                         goto err;
1900         }
1901 
1902         if (sp->disable_fragments && msg_len > asoc->frag_point) {
1903                 err = -EMSGSIZE;
1904                 goto err;
1905         }
1906 
1907         if (asoc->pmtu_pending) {
1908                 if (sp->param_flags & SPP_PMTUD_ENABLE)
1909                         sctp_assoc_sync_pmtu(asoc);
1910                 asoc->pmtu_pending = 0;
1911         }
1912 
1913         if (sctp_wspace(asoc) < (int)msg_len)
1914                 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1915 
1916         if (sctp_wspace(asoc) <= 0) {
1917                 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1918                 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1919                 if (err)
1920                         goto err;
1921         }
1922 
1923         if (sctp_state(asoc, CLOSED)) {
1924                 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1925                 if (err)
1926                         goto err;
1927 
1928                 if (sp->strm_interleave) {
1929                         timeo = sock_sndtimeo(sk, 0);
1930                         err = sctp_wait_for_connect(asoc, &timeo);
1931                         if (err) {
1932                                 err = -ESRCH;
1933                                 goto err;
1934                         }
1935                 } else {
1936                         wait_connect = true;
1937                 }
1938 
1939                 pr_debug("%s: we associated primitively\n", __func__);
1940         }
1941 
1942         datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1943         if (IS_ERR(datamsg)) {
1944                 err = PTR_ERR(datamsg);
1945                 goto err;
1946         }
1947 
1948         asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1949 
1950         list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1951                 sctp_chunk_hold(chunk);
1952                 sctp_set_owner_w(chunk);
1953                 chunk->transport = transport;
1954         }
1955 
1956         err = sctp_primitive_SEND(net, asoc, datamsg);
1957         if (err) {
1958                 sctp_datamsg_free(datamsg);
1959                 goto err;
1960         }
1961 
1962         pr_debug("%s: we sent primitively\n", __func__);
1963 
1964         sctp_datamsg_put(datamsg);
1965 
1966         if (unlikely(wait_connect)) {
1967                 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1968                 sctp_wait_for_connect(asoc, &timeo);
1969         }
1970 
1971         err = msg_len;
1972 
1973 err:
1974         return err;
1975 }
1976 
1977 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1978                                                const struct msghdr *msg,
1979                                                struct sctp_cmsgs *cmsgs)
1980 {
1981         union sctp_addr *daddr = NULL;
1982         int err;
1983 
1984         if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1985                 int len = msg->msg_namelen;
1986 
1987                 if (len > sizeof(*daddr))
1988                         len = sizeof(*daddr);
1989 
1990                 daddr = (union sctp_addr *)msg->msg_name;
1991 
1992                 err = sctp_verify_addr(sk, daddr, len);
1993                 if (err)
1994                         return ERR_PTR(err);
1995         }
1996 
1997         return daddr;
1998 }
1999 
2000 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2001                                       struct sctp_sndrcvinfo *sinfo,
2002                                       struct sctp_cmsgs *cmsgs)
2003 {
2004         if (!cmsgs->srinfo && !cmsgs->sinfo) {
2005                 sinfo->sinfo_stream = asoc->default_stream;
2006                 sinfo->sinfo_ppid = asoc->default_ppid;
2007                 sinfo->sinfo_context = asoc->default_context;
2008                 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2009 
2010                 if (!cmsgs->prinfo)
2011                         sinfo->sinfo_flags = asoc->default_flags;
2012         }
2013 
2014         if (!cmsgs->srinfo && !cmsgs->prinfo)
2015                 sinfo->sinfo_timetolive = asoc->default_timetolive;
2016 
2017         if (cmsgs->authinfo) {
2018                 /* Reuse sinfo_tsn to indicate that authinfo was set and
2019                  * sinfo_ssn to save the keyid on tx path.
2020                  */
2021                 sinfo->sinfo_tsn = 1;
2022                 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2023         }
2024 }
2025 
2026 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2027 {
2028         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2029         struct sctp_transport *transport = NULL;
2030         struct sctp_sndrcvinfo _sinfo, *sinfo;
2031         struct sctp_association *asoc, *tmp;
2032         struct sctp_cmsgs cmsgs;
2033         union sctp_addr *daddr;
2034         bool new = false;
2035         __u16 sflags;
2036         int err;
2037 
2038         /* Parse and get snd_info */
2039         err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2040         if (err)
2041                 goto out;
2042 
2043         sinfo  = &_sinfo;
2044         sflags = sinfo->sinfo_flags;
2045 
2046         /* Get daddr from msg */
2047         daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2048         if (IS_ERR(daddr)) {
2049                 err = PTR_ERR(daddr);
2050                 goto out;
2051         }
2052 
2053         lock_sock(sk);
2054 
2055         /* SCTP_SENDALL process */
2056         if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2057                 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
2058                         err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2059                                                         msg_len);
2060                         if (err == 0)
2061                                 continue;
2062                         if (err < 0)
2063                                 goto out_unlock;
2064 
2065                         sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2066 
2067                         err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2068                                                    NULL, sinfo);
2069                         if (err < 0)
2070                                 goto out_unlock;
2071 
2072                         iov_iter_revert(&msg->msg_iter, err);
2073                 }
2074 
2075                 goto out_unlock;
2076         }
2077 
2078         /* Get and check or create asoc */
2079         if (daddr) {
2080                 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2081                 if (asoc) {
2082                         err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2083                                                         msg_len);
2084                         if (err <= 0)
2085                                 goto out_unlock;
2086                 } else {
2087                         err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2088                                                     &transport);
2089                         if (err)
2090                                 goto out_unlock;
2091 
2092                         asoc = transport->asoc;
2093                         new = true;
2094                 }
2095 
2096                 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2097                         transport = NULL;
2098         } else {
2099                 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2100                 if (!asoc) {
2101                         err = -EPIPE;
2102                         goto out_unlock;
2103                 }
2104 
2105                 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2106                 if (err <= 0)
2107                         goto out_unlock;
2108         }
2109 
2110         /* Update snd_info with the asoc */
2111         sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2112 
2113         /* Send msg to the asoc */
2114         err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2115         if (err < 0 && err != -ESRCH && new)
2116                 sctp_association_free(asoc);
2117 
2118 out_unlock:
2119         release_sock(sk);
2120 out:
2121         return sctp_error(sk, msg->msg_flags, err);
2122 }
2123 
2124 /* This is an extended version of skb_pull() that removes the data from the
2125  * start of a skb even when data is spread across the list of skb's in the
2126  * frag_list. len specifies the total amount of data that needs to be removed.
2127  * when 'len' bytes could be removed from the skb, it returns 0.
2128  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2129  * could not be removed.
2130  */
2131 static int sctp_skb_pull(struct sk_buff *skb, int len)
2132 {
2133         struct sk_buff *list;
2134         int skb_len = skb_headlen(skb);
2135         int rlen;
2136 
2137         if (len <= skb_len) {
2138                 __skb_pull(skb, len);
2139                 return 0;
2140         }
2141         len -= skb_len;
2142         __skb_pull(skb, skb_len);
2143 
2144         skb_walk_frags(skb, list) {
2145                 rlen = sctp_skb_pull(list, len);
2146                 skb->len -= (len-rlen);
2147                 skb->data_len -= (len-rlen);
2148 
2149                 if (!rlen)
2150                         return 0;
2151 
2152                 len = rlen;
2153         }
2154 
2155         return len;
2156 }
2157 
2158 /* API 3.1.3  recvmsg() - UDP Style Syntax
2159  *
2160  *  ssize_t recvmsg(int socket, struct msghdr *message,
2161  *                    int flags);
2162  *
2163  *  socket  - the socket descriptor of the endpoint.
2164  *  message - pointer to the msghdr structure which contains a single
2165  *            user message and possibly some ancillary data.
2166  *
2167  *            See Section 5 for complete description of the data
2168  *            structures.
2169  *
2170  *  flags   - flags sent or received with the user message, see Section
2171  *            5 for complete description of the flags.
2172  */
2173 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2174                         int noblock, int flags, int *addr_len)
2175 {
2176         struct sctp_ulpevent *event = NULL;
2177         struct sctp_sock *sp = sctp_sk(sk);
2178         struct sk_buff *skb, *head_skb;
2179         int copied;
2180         int err = 0;
2181         int skb_len;
2182 
2183         pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2184                  "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2185                  addr_len);
2186 
2187         lock_sock(sk);
2188 
2189         if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2190             !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2191                 err = -ENOTCONN;
2192                 goto out;
2193         }
2194 
2195         skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2196         if (!skb)
2197                 goto out;
2198 
2199         /* Get the total length of the skb including any skb's in the
2200          * frag_list.
2201          */
2202         skb_len = skb->len;
2203 
2204         copied = skb_len;
2205         if (copied > len)
2206                 copied = len;
2207 
2208         err = skb_copy_datagram_msg(skb, 0, msg, copied);
2209 
2210         event = sctp_skb2event(skb);
2211 
2212         if (err)
2213                 goto out_free;
2214 
2215         if (event->chunk && event->chunk->head_skb)
2216                 head_skb = event->chunk->head_skb;
2217         else
2218                 head_skb = skb;
2219         sock_recv_ts_and_drops(msg, sk, head_skb);
2220         if (sctp_ulpevent_is_notification(event)) {
2221                 msg->msg_flags |= MSG_NOTIFICATION;
2222                 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2223         } else {
2224                 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2225         }
2226 
2227         /* Check if we allow SCTP_NXTINFO. */
2228         if (sp->recvnxtinfo)
2229                 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2230         /* Check if we allow SCTP_RCVINFO. */
2231         if (sp->recvrcvinfo)
2232                 sctp_ulpevent_read_rcvinfo(event, msg);
2233         /* Check if we allow SCTP_SNDRCVINFO. */
2234         if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2235                 sctp_ulpevent_read_sndrcvinfo(event, msg);
2236 
2237         err = copied;
2238 
2239         /* If skb's length exceeds the user's buffer, update the skb and
2240          * push it back to the receive_queue so that the next call to
2241          * recvmsg() will return the remaining data. Don't set MSG_EOR.
2242          */
2243         if (skb_len > copied) {
2244                 msg->msg_flags &= ~MSG_EOR;
2245                 if (flags & MSG_PEEK)
2246                         goto out_free;
2247                 sctp_skb_pull(skb, copied);
2248                 skb_queue_head(&sk->sk_receive_queue, skb);
2249 
2250                 /* When only partial message is copied to the user, increase
2251                  * rwnd by that amount. If all the data in the skb is read,
2252                  * rwnd is updated when the event is freed.
2253                  */
2254                 if (!sctp_ulpevent_is_notification(event))
2255                         sctp_assoc_rwnd_increase(event->asoc, copied);
2256                 goto out;
2257         } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2258                    (event->msg_flags & MSG_EOR))
2259                 msg->msg_flags |= MSG_EOR;
2260         else
2261                 msg->msg_flags &= ~MSG_EOR;
2262 
2263 out_free:
2264         if (flags & MSG_PEEK) {
2265                 /* Release the skb reference acquired after peeking the skb in
2266                  * sctp_skb_recv_datagram().
2267                  */
2268                 kfree_skb(skb);
2269         } else {
2270                 /* Free the event which includes releasing the reference to
2271                  * the owner of the skb, freeing the skb and updating the
2272                  * rwnd.
2273                  */
2274                 sctp_ulpevent_free(event);
2275         }
2276 out:
2277         release_sock(sk);
2278         return err;
2279 }
2280 
2281 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2282  *
2283  * This option is a on/off flag.  If enabled no SCTP message
2284  * fragmentation will be performed.  Instead if a message being sent
2285  * exceeds the current PMTU size, the message will NOT be sent and
2286  * instead a error will be indicated to the user.
2287  */
2288 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2289                                              char __user *optval,
2290                                              unsigned int optlen)
2291 {
2292         int val;
2293 
2294         if (optlen < sizeof(int))
2295                 return -EINVAL;
2296 
2297         if (get_user(val, (int __user *)optval))
2298                 return -EFAULT;
2299 
2300         sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2301 
2302         return 0;
2303 }
2304 
2305 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2306                                   unsigned int optlen)
2307 {
2308         struct sctp_event_subscribe subscribe;
2309         __u8 *sn_type = (__u8 *)&subscribe;
2310         struct sctp_sock *sp = sctp_sk(sk);
2311         struct sctp_association *asoc;
2312         int i;
2313 
2314         if (optlen > sizeof(struct sctp_event_subscribe))
2315                 return -EINVAL;
2316 
2317         if (copy_from_user(&subscribe, optval, optlen))
2318                 return -EFAULT;
2319 
2320         for (i = 0; i < optlen; i++)
2321                 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2322                                        sn_type[i]);
2323 
2324         list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2325                 asoc->subscribe = sctp_sk(sk)->subscribe;
2326 
2327         /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2328          * if there is no data to be sent or retransmit, the stack will
2329          * immediately send up this notification.
2330          */
2331         if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2332                 struct sctp_ulpevent *event;
2333 
2334                 asoc = sctp_id2assoc(sk, 0);
2335                 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2336                         event = sctp_ulpevent_make_sender_dry_event(asoc,
2337                                         GFP_USER | __GFP_NOWARN);
2338                         if (!event)
2339                                 return -ENOMEM;
2340 
2341                         asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2342                 }
2343         }
2344 
2345         return 0;
2346 }
2347 
2348 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2349  *
2350  * This socket option is applicable to the UDP-style socket only.  When
2351  * set it will cause associations that are idle for more than the
2352  * specified number of seconds to automatically close.  An association
2353  * being idle is defined an association that has NOT sent or received
2354  * user data.  The special value of '' indicates that no automatic
2355  * close of any associations should be performed.  The option expects an
2356  * integer defining the number of seconds of idle time before an
2357  * association is closed.
2358  */
2359 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2360                                      unsigned int optlen)
2361 {
2362         struct sctp_sock *sp = sctp_sk(sk);
2363         struct net *net = sock_net(sk);
2364 
2365         /* Applicable to UDP-style socket only */
2366         if (sctp_style(sk, TCP))
2367                 return -EOPNOTSUPP;
2368         if (optlen != sizeof(int))
2369                 return -EINVAL;
2370         if (copy_from_user(&sp->autoclose, optval, optlen))
2371                 return -EFAULT;
2372 
2373         if (sp->autoclose > net->sctp.max_autoclose)
2374                 sp->autoclose = net->sctp.max_autoclose;
2375 
2376         return 0;
2377 }
2378 
2379 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2380  *
2381  * Applications can enable or disable heartbeats for any peer address of
2382  * an association, modify an address's heartbeat interval, force a
2383  * heartbeat to be sent immediately, and adjust the address's maximum
2384  * number of retransmissions sent before an address is considered
2385  * unreachable.  The following structure is used to access and modify an
2386  * address's parameters:
2387  *
2388  *  struct sctp_paddrparams {
2389  *     sctp_assoc_t            spp_assoc_id;
2390  *     struct sockaddr_storage spp_address;
2391  *     uint32_t                spp_hbinterval;
2392  *     uint16_t                spp_pathmaxrxt;
2393  *     uint32_t                spp_pathmtu;
2394  *     uint32_t                spp_sackdelay;
2395  *     uint32_t                spp_flags;
2396  *     uint32_t                spp_ipv6_flowlabel;
2397  *     uint8_t                 spp_dscp;
2398  * };
2399  *
2400  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2401  *                     application, and identifies the association for
2402  *                     this query.
2403  *   spp_address     - This specifies which address is of interest.
2404  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2405  *                     in milliseconds.  If a  value of zero
2406  *                     is present in this field then no changes are to
2407  *                     be made to this parameter.
2408  *   spp_pathmaxrxt  - This contains the maximum number of
2409  *                     retransmissions before this address shall be
2410  *                     considered unreachable. If a  value of zero
2411  *                     is present in this field then no changes are to
2412  *                     be made to this parameter.
2413  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2414  *                     specified here will be the "fixed" path mtu.
2415  *                     Note that if the spp_address field is empty
2416  *                     then all associations on this address will
2417  *                     have this fixed path mtu set upon them.
2418  *
2419  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2420  *                     the number of milliseconds that sacks will be delayed
2421  *                     for. This value will apply to all addresses of an
2422  *                     association if the spp_address field is empty. Note
2423  *                     also, that if delayed sack is enabled and this
2424  *                     value is set to 0, no change is made to the last
2425  *                     recorded delayed sack timer value.
2426  *
2427  *   spp_flags       - These flags are used to control various features
2428  *                     on an association. The flag field may contain
2429  *                     zero or more of the following options.
2430  *
2431  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2432  *                     specified address. Note that if the address
2433  *                     field is empty all addresses for the association
2434  *                     have heartbeats enabled upon them.
2435  *
2436  *                     SPP_HB_DISABLE - Disable heartbeats on the
2437  *                     speicifed address. Note that if the address
2438  *                     field is empty all addresses for the association
2439  *                     will have their heartbeats disabled. Note also
2440  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2441  *                     mutually exclusive, only one of these two should
2442  *                     be specified. Enabling both fields will have
2443  *                     undetermined results.
2444  *
2445  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2446  *                     to be made immediately.
2447  *
2448  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2449  *                     heartbeat delayis to be set to the value of 0
2450  *                     milliseconds.
2451  *
2452  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2453  *                     discovery upon the specified address. Note that
2454  *                     if the address feild is empty then all addresses
2455  *                     on the association are effected.
2456  *
2457  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2458  *                     discovery upon the specified address. Note that
2459  *                     if the address feild is empty then all addresses
2460  *                     on the association are effected. Not also that
2461  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2462  *                     exclusive. Enabling both will have undetermined
2463  *                     results.
2464  *
2465  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2466  *                     on delayed sack. The time specified in spp_sackdelay
2467  *                     is used to specify the sack delay for this address. Note
2468  *                     that if spp_address is empty then all addresses will
2469  *                     enable delayed sack and take on the sack delay
2470  *                     value specified in spp_sackdelay.
2471  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2472  *                     off delayed sack. If the spp_address field is blank then
2473  *                     delayed sack is disabled for the entire association. Note
2474  *                     also that this field is mutually exclusive to
2475  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2476  *                     results.
2477  *
2478  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
2479  *                     setting of the IPV6 flow label value.  The value is
2480  *                     contained in the spp_ipv6_flowlabel field.
2481  *                     Upon retrieval, this flag will be set to indicate that
2482  *                     the spp_ipv6_flowlabel field has a valid value returned.
2483  *                     If a specific destination address is set (in the
2484  *                     spp_address field), then the value returned is that of
2485  *                     the address.  If just an association is specified (and
2486  *                     no address), then the association's default flow label
2487  *                     is returned.  If neither an association nor a destination
2488  *                     is specified, then the socket's default flow label is
2489  *                     returned.  For non-IPv6 sockets, this flag will be left
2490  *                     cleared.
2491  *
2492  *                     SPP_DSCP:  Setting this flag enables the setting of the
2493  *                     Differentiated Services Code Point (DSCP) value
2494  *                     associated with either the association or a specific
2495  *                     address.  The value is obtained in the spp_dscp field.
2496  *                     Upon retrieval, this flag will be set to indicate that
2497  *                     the spp_dscp field has a valid value returned.  If a
2498  *                     specific destination address is set when called (in the
2499  *                     spp_address field), then that specific destination
2500  *                     address's DSCP value is returned.  If just an association
2501  *                     is specified, then the association's default DSCP is
2502  *                     returned.  If neither an association nor a destination is
2503  *                     specified, then the socket's default DSCP is returned.
2504  *
2505  *   spp_ipv6_flowlabel
2506  *                   - This field is used in conjunction with the
2507  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2508  *                     The 20 least significant bits are used for the flow
2509  *                     label.  This setting has precedence over any IPv6-layer
2510  *                     setting.
2511  *
2512  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
2513  *                     and contains the DSCP.  The 6 most significant bits are
2514  *                     used for the DSCP.  This setting has precedence over any
2515  *                     IPv4- or IPv6- layer setting.
2516  */
2517 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2518                                        struct sctp_transport   *trans,
2519                                        struct sctp_association *asoc,
2520                                        struct sctp_sock        *sp,
2521                                        int                      hb_change,
2522                                        int                      pmtud_change,
2523                                        int                      sackdelay_change)
2524 {
2525         int error;
2526 
2527         if (params->spp_flags & SPP_HB_DEMAND && trans) {
2528                 struct net *net = sock_net(trans->asoc->base.sk);
2529 
2530                 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2531                 if (error)
2532                         return error;
2533         }
2534 
2535         /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2536          * this field is ignored.  Note also that a value of zero indicates
2537          * the current setting should be left unchanged.
2538          */
2539         if (params->spp_flags & SPP_HB_ENABLE) {
2540 
2541                 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2542                  * set.  This lets us use 0 value when this flag
2543                  * is set.
2544                  */
2545                 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2546                         params->spp_hbinterval = 0;
2547 
2548                 if (params->spp_hbinterval ||
2549                     (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2550                         if (trans) {
2551                                 trans->hbinterval =
2552                                     msecs_to_jiffies(params->spp_hbinterval);
2553                         } else if (asoc) {
2554                                 asoc->hbinterval =
2555                                     msecs_to_jiffies(params->spp_hbinterval);
2556                         } else {
2557                                 sp->hbinterval = params->spp_hbinterval;
2558                         }
2559                 }
2560         }
2561 
2562         if (hb_change) {
2563                 if (trans) {
2564                         trans->param_flags =
2565                                 (trans->param_flags & ~SPP_HB) | hb_change;
2566                 } else if (asoc) {
2567                         asoc->param_flags =
2568                                 (asoc->param_flags & ~SPP_HB) | hb_change;
2569                 } else {
2570                         sp->param_flags =
2571                                 (sp->param_flags & ~SPP_HB) | hb_change;
2572                 }
2573         }
2574 
2575         /* When Path MTU discovery is disabled the value specified here will
2576          * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2577          * include the flag SPP_PMTUD_DISABLE for this field to have any
2578          * effect).
2579          */
2580         if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2581                 if (trans) {
2582                         trans->pathmtu = params->spp_pathmtu;
2583                         sctp_assoc_sync_pmtu(asoc);
2584                 } else if (asoc) {
2585                         sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2586                 } else {
2587                         sp->pathmtu = params->spp_pathmtu;
2588                 }
2589         }
2590 
2591         if (pmtud_change) {
2592                 if (trans) {
2593                         int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2594                                 (params->spp_flags & SPP_PMTUD_ENABLE);
2595                         trans->param_flags =
2596                                 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2597                         if (update) {
2598                                 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2599                                 sctp_assoc_sync_pmtu(asoc);
2600                         }
2601                 } else if (asoc) {
2602                         asoc->param_flags =
2603                                 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2604                 } else {
2605                         sp->param_flags =
2606                                 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2607                 }
2608         }
2609 
2610         /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2611          * value of this field is ignored.  Note also that a value of zero
2612          * indicates the current setting should be left unchanged.
2613          */
2614         if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2615                 if (trans) {
2616                         trans->sackdelay =
2617                                 msecs_to_jiffies(params->spp_sackdelay);
2618                 } else if (asoc) {
2619                         asoc->sackdelay =
2620                                 msecs_to_jiffies(params->spp_sackdelay);
2621                 } else {
2622                         sp->sackdelay = params->spp_sackdelay;
2623                 }
2624         }
2625 
2626         if (sackdelay_change) {
2627                 if (trans) {
2628                         trans->param_flags =
2629                                 (trans->param_flags & ~SPP_SACKDELAY) |
2630                                 sackdelay_change;
2631                 } else if (asoc) {
2632                         asoc->param_flags =
2633                                 (asoc->param_flags & ~SPP_SACKDELAY) |
2634                                 sackdelay_change;
2635                 } else {
2636                         sp->param_flags =
2637                                 (sp->param_flags & ~SPP_SACKDELAY) |
2638                                 sackdelay_change;
2639                 }
2640         }
2641 
2642         /* Note that a value of zero indicates the current setting should be
2643            left unchanged.
2644          */
2645         if (params->spp_pathmaxrxt) {
2646                 if (trans) {
2647                         trans->pathmaxrxt = params->spp_pathmaxrxt;
2648                 } else if (asoc) {
2649                         asoc->pathmaxrxt = params->spp_pathmaxrxt;
2650                 } else {
2651                         sp->pathmaxrxt = params->spp_pathmaxrxt;
2652                 }
2653         }
2654 
2655         if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2656                 if (trans) {
2657                         if (trans->ipaddr.sa.sa_family == AF_INET6) {
2658                                 trans->flowlabel = params->spp_ipv6_flowlabel &
2659                                                    SCTP_FLOWLABEL_VAL_MASK;
2660                                 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2661                         }
2662                 } else if (asoc) {
2663                         struct sctp_transport *t;
2664 
2665                         list_for_each_entry(t, &asoc->peer.transport_addr_list,
2666                                             transports) {
2667                                 if (t->ipaddr.sa.sa_family != AF_INET6)
2668                                         continue;
2669                                 t->flowlabel = params->spp_ipv6_flowlabel &
2670                                                SCTP_FLOWLABEL_VAL_MASK;
2671                                 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2672                         }
2673                         asoc->flowlabel = params->spp_ipv6_flowlabel &
2674                                           SCTP_FLOWLABEL_VAL_MASK;
2675                         asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2676                 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2677                         sp->flowlabel = params->spp_ipv6_flowlabel &
2678                                         SCTP_FLOWLABEL_VAL_MASK;
2679                         sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2680                 }
2681         }
2682 
2683         if (params->spp_flags & SPP_DSCP) {
2684                 if (trans) {
2685                         trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2686                         trans->dscp |= SCTP_DSCP_SET_MASK;
2687                 } else if (asoc) {
2688                         struct sctp_transport *t;
2689 
2690                         list_for_each_entry(t, &asoc->peer.transport_addr_list,
2691                                             transports) {
2692                                 t->dscp = params->spp_dscp &
2693                                           SCTP_DSCP_VAL_MASK;
2694                                 t->dscp |= SCTP_DSCP_SET_MASK;
2695                         }
2696                         asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2697                         asoc->dscp |= SCTP_DSCP_SET_MASK;
2698                 } else {
2699                         sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2700                         sp->dscp |= SCTP_DSCP_SET_MASK;
2701                 }
2702         }
2703 
2704         return 0;
2705 }
2706 
2707 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2708                                             char __user *optval,
2709                                             unsigned int optlen)
2710 {
2711         struct sctp_paddrparams  params;
2712         struct sctp_transport   *trans = NULL;
2713         struct sctp_association *asoc = NULL;
2714         struct sctp_sock        *sp = sctp_sk(sk);
2715         int error;
2716         int hb_change, pmtud_change, sackdelay_change;
2717 
2718         if (optlen == sizeof(params)) {
2719                 if (copy_from_user(&params, optval, optlen))
2720                         return -EFAULT;
2721         } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2722                                             spp_ipv6_flowlabel), 4)) {
2723                 if (copy_from_user(&params, optval, optlen))
2724                         return -EFAULT;
2725                 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2726                         return -EINVAL;
2727         } else {
2728                 return -EINVAL;
2729         }
2730 
2731         /* Validate flags and value parameters. */
2732         hb_change        = params.spp_flags & SPP_HB;
2733         pmtud_change     = params.spp_flags & SPP_PMTUD;
2734         sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2735 
2736         if (hb_change        == SPP_HB ||
2737             pmtud_change     == SPP_PMTUD ||
2738             sackdelay_change == SPP_SACKDELAY ||
2739             params.spp_sackdelay > 500 ||
2740             (params.spp_pathmtu &&
2741              params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2742                 return -EINVAL;
2743 
2744         /* If an address other than INADDR_ANY is specified, and
2745          * no transport is found, then the request is invalid.
2746          */
2747         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2748                 trans = sctp_addr_id2transport(sk, &params.spp_address,
2749                                                params.spp_assoc_id);
2750                 if (!trans)
2751                         return -EINVAL;
2752         }
2753 
2754         /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2755          * socket is a one to many style socket, and an association
2756          * was not found, then the id was invalid.
2757          */
2758         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2759         if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
2760             sctp_style(sk, UDP))
2761                 return -EINVAL;
2762 
2763         /* Heartbeat demand can only be sent on a transport or
2764          * association, but not a socket.
2765          */
2766         if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2767                 return -EINVAL;
2768 
2769         /* Process parameters. */
2770         error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2771                                             hb_change, pmtud_change,
2772                                             sackdelay_change);
2773 
2774         if (error)
2775                 return error;
2776 
2777         /* If changes are for association, also apply parameters to each
2778          * transport.
2779          */
2780         if (!trans && asoc) {
2781                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2782                                 transports) {
2783                         sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2784                                                     hb_change, pmtud_change,
2785                                                     sackdelay_change);
2786                 }
2787         }
2788 
2789         return 0;
2790 }
2791 
2792 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2793 {
2794         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2795 }
2796 
2797 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2798 {
2799         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2800 }
2801 
2802 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2803                                         struct sctp_association *asoc)
2804 {
2805         struct sctp_transport *trans;
2806 
2807         if (params->sack_delay) {
2808                 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2809                 asoc->param_flags =
2810                         sctp_spp_sackdelay_enable(asoc->param_flags);
2811         }
2812         if (params->sack_freq == 1) {
2813                 asoc->param_flags =
2814                         sctp_spp_sackdelay_disable(asoc->param_flags);
2815         } else if (params->sack_freq > 1) {
2816                 asoc->sackfreq = params->sack_freq;
2817                 asoc->param_flags =
2818                         sctp_spp_sackdelay_enable(asoc->param_flags);
2819         }
2820 
2821         list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2822                             transports) {
2823                 if (params->sack_delay) {
2824                         trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2825                         trans->param_flags =
2826                                 sctp_spp_sackdelay_enable(trans->param_flags);
2827                 }
2828                 if (params->sack_freq == 1) {
2829                         trans->param_flags =
2830                                 sctp_spp_sackdelay_disable(trans->param_flags);
2831                 } else if (params->sack_freq > 1) {
2832                         trans->sackfreq = params->sack_freq;
2833                         trans->param_flags =
2834                                 sctp_spp_sackdelay_enable(trans->param_flags);
2835                 }
2836         }
2837 }
2838 
2839 /*
2840  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2841  *
2842  * This option will effect the way delayed acks are performed.  This
2843  * option allows you to get or set the delayed ack time, in
2844  * milliseconds.  It also allows changing the delayed ack frequency.
2845  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2846  * the assoc_id is 0, then this sets or gets the endpoints default
2847  * values.  If the assoc_id field is non-zero, then the set or get
2848  * effects the specified association for the one to many model (the
2849  * assoc_id field is ignored by the one to one model).  Note that if
2850  * sack_delay or sack_freq are 0 when setting this option, then the
2851  * current values will remain unchanged.
2852  *
2853  * struct sctp_sack_info {
2854  *     sctp_assoc_t            sack_assoc_id;
2855  *     uint32_t                sack_delay;
2856  *     uint32_t                sack_freq;
2857  * };
2858  *
2859  * sack_assoc_id -  This parameter, indicates which association the user
2860  *    is performing an action upon.  Note that if this field's value is
2861  *    zero then the endpoints default value is changed (effecting future
2862  *    associations only).
2863  *
2864  * sack_delay -  This parameter contains the number of milliseconds that
2865  *    the user is requesting the delayed ACK timer be set to.  Note that
2866  *    this value is defined in the standard to be between 200 and 500
2867  *    milliseconds.
2868  *
2869  * sack_freq -  This parameter contains the number of packets that must
2870  *    be received before a sack is sent without waiting for the delay
2871  *    timer to expire.  The default value for this is 2, setting this
2872  *    value to 1 will disable the delayed sack algorithm.
2873  */
2874 
2875 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2876                                        char __user *optval, unsigned int optlen)
2877 {
2878         struct sctp_sock *sp = sctp_sk(sk);
2879         struct sctp_association *asoc;
2880         struct sctp_sack_info params;
2881 
2882         if (optlen == sizeof(struct sctp_sack_info)) {
2883                 if (copy_from_user(&params, optval, optlen))
2884                         return -EFAULT;
2885 
2886                 if (params.sack_delay == 0 && params.sack_freq == 0)
2887                         return 0;
2888         } else if (optlen == sizeof(struct sctp_assoc_value)) {
2889                 pr_warn_ratelimited(DEPRECATED
2890                                     "%s (pid %d) "
2891                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2892                                     "Use struct sctp_sack_info instead\n",
2893                                     current->comm, task_pid_nr(current));
2894                 if (copy_from_user(&params, optval, optlen))
2895                         return -EFAULT;
2896 
2897                 if (params.sack_delay == 0)
2898                         params.sack_freq = 1;
2899                 else
2900                         params.sack_freq = 0;
2901         } else
2902                 return -EINVAL;
2903 
2904         /* Validate value parameter. */
2905         if (params.sack_delay > 500)
2906                 return -EINVAL;
2907 
2908         /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2909          * socket is a one to many style socket, and an association
2910          * was not found, then the id was invalid.
2911          */
2912         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2913         if (!asoc && params.sack_assoc_id > SCTP_ALL_ASSOC &&
2914             sctp_style(sk, UDP))
2915                 return -EINVAL;
2916 
2917         if (asoc) {
2918                 sctp_apply_asoc_delayed_ack(&params, asoc);
2919 
2920                 return 0;
2921         }
2922 
2923         if (sctp_style(sk, TCP))
2924                 params.sack_assoc_id = SCTP_FUTURE_ASSOC;
2925 
2926         if (params.sack_assoc_id == SCTP_FUTURE_ASSOC ||
2927             params.sack_assoc_id == SCTP_ALL_ASSOC) {
2928                 if (params.sack_delay) {
2929                         sp->sackdelay = params.sack_delay;
2930                         sp->param_flags =
2931                                 sctp_spp_sackdelay_enable(sp->param_flags);
2932                 }
2933                 if (params.sack_freq == 1) {
2934                         sp->param_flags =
2935                                 sctp_spp_sackdelay_disable(sp->param_flags);
2936                 } else if (params.sack_freq > 1) {
2937                         sp->sackfreq = params.sack_freq;
2938                         sp->param_flags =
2939                                 sctp_spp_sackdelay_enable(sp->param_flags);
2940                 }
2941         }
2942 
2943         if (params.sack_assoc_id == SCTP_CURRENT_ASSOC ||
2944             params.sack_assoc_id == SCTP_ALL_ASSOC)
2945                 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2946                         sctp_apply_asoc_delayed_ack(&params, asoc);
2947 
2948         return 0;
2949 }
2950 
2951 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2952  *
2953  * Applications can specify protocol parameters for the default association
2954  * initialization.  The option name argument to setsockopt() and getsockopt()
2955  * is SCTP_INITMSG.
2956  *
2957  * Setting initialization parameters is effective only on an unconnected
2958  * socket (for UDP-style sockets only future associations are effected
2959  * by the change).  With TCP-style sockets, this option is inherited by
2960  * sockets derived from a listener socket.
2961  */
2962 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2963 {
2964         struct sctp_initmsg sinit;
2965         struct sctp_sock *sp = sctp_sk(sk);
2966 
2967         if (optlen != sizeof(struct sctp_initmsg))
2968                 return -EINVAL;
2969         if (copy_from_user(&sinit, optval, optlen))
2970                 return -EFAULT;
2971 
2972         if (sinit.sinit_num_ostreams)
2973                 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2974         if (sinit.sinit_max_instreams)
2975                 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2976         if (sinit.sinit_max_attempts)
2977                 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2978         if (sinit.sinit_max_init_timeo)
2979                 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2980 
2981         return 0;
2982 }
2983 
2984 /*
2985  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2986  *
2987  *   Applications that wish to use the sendto() system call may wish to
2988  *   specify a default set of parameters that would normally be supplied
2989  *   through the inclusion of ancillary data.  This socket option allows
2990  *   such an application to set the default sctp_sndrcvinfo structure.
2991  *   The application that wishes to use this socket option simply passes
2992  *   in to this call the sctp_sndrcvinfo structure defined in Section
2993  *   5.2.2) The input parameters accepted by this call include
2994  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2995  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2996  *   to this call if the caller is using the UDP model.
2997  */
2998 static int sctp_setsockopt_default_send_param(struct sock *sk,
2999                                               char __user *optval,
3000                                               unsigned int optlen)
3001 {
3002         struct sctp_sock *sp = sctp_sk(sk);
3003         struct sctp_association *asoc;
3004         struct sctp_sndrcvinfo info;
3005 
3006         if (optlen != sizeof(info))
3007                 return -EINVAL;
3008         if (copy_from_user(&info, optval, optlen))
3009                 return -EFAULT;
3010         if (info.sinfo_flags &
3011             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3012               SCTP_ABORT | SCTP_EOF))
3013                 return -EINVAL;
3014 
3015         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
3016         if (!asoc && info.sinfo_assoc_id > SCTP_ALL_ASSOC &&
3017             sctp_style(sk, UDP))
3018                 return -EINVAL;
3019 
3020         if (asoc) {
3021                 asoc->default_stream = info.sinfo_stream;
3022                 asoc->default_flags = info.sinfo_flags;
3023                 asoc->default_ppid = info.sinfo_ppid;
3024                 asoc->default_context = info.sinfo_context;
3025                 asoc->default_timetolive = info.sinfo_timetolive;
3026 
3027                 return 0;
3028         }
3029 
3030         if (sctp_style(sk, TCP))
3031                 info.sinfo_assoc_id = SCTP_FUTURE_ASSOC;
3032 
3033         if (info.sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
3034             info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3035                 sp->default_stream = info.sinfo_stream;
3036                 sp->default_flags = info.sinfo_flags;
3037                 sp->default_ppid = info.sinfo_ppid;
3038                 sp->default_context = info.sinfo_context;
3039                 sp->default_timetolive = info.sinfo_timetolive;
3040         }
3041 
3042         if (info.sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
3043             info.sinfo_assoc_id == SCTP_ALL_ASSOC) {
3044                 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3045                         asoc->default_stream = info.sinfo_stream;
3046                         asoc->default_flags = info.sinfo_flags;
3047                         asoc->default_ppid = info.sinfo_ppid;
3048                         asoc->default_context = info.sinfo_context;
3049                         asoc->default_timetolive = info.sinfo_timetolive;
3050                 }
3051         }
3052 
3053         return 0;
3054 }
3055 
3056 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
3057  * (SCTP_DEFAULT_SNDINFO)
3058  */
3059 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
3060                                            char __user *optval,
3061                                            unsigned int optlen)
3062 {
3063         struct sctp_sock *sp = sctp_sk(sk);
3064         struct sctp_association *asoc;
3065         struct sctp_sndinfo info;
3066 
3067         if (optlen != sizeof(info))
3068                 return -EINVAL;
3069         if (copy_from_user(&info, optval, optlen))
3070                 return -EFAULT;
3071         if (info.snd_flags &
3072             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3073               SCTP_ABORT | SCTP_EOF))
3074                 return -EINVAL;
3075 
3076         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
3077         if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC &&
3078             sctp_style(sk, UDP))
3079                 return -EINVAL;
3080 
3081         if (asoc) {
3082                 asoc->default_stream = info.snd_sid;
3083                 asoc->default_flags = info.snd_flags;
3084                 asoc->default_ppid = info.snd_ppid;
3085                 asoc->default_context = info.snd_context;
3086 
3087                 return 0;
3088         }
3089 
3090         if (sctp_style(sk, TCP))
3091                 info.snd_assoc_id = SCTP_FUTURE_ASSOC;
3092 
3093         if (info.snd_assoc_id == SCTP_FUTURE_ASSOC ||
3094             info.snd_assoc_id == SCTP_ALL_ASSOC) {
3095                 sp->default_stream = info.snd_sid;
3096                 sp->default_flags = info.snd_flags;
3097                 sp->default_ppid = info.snd_ppid;
3098                 sp->default_context = info.snd_context;
3099         }
3100 
3101         if (info.snd_assoc_id == SCTP_CURRENT_ASSOC ||
3102             info.snd_assoc_id == SCTP_ALL_ASSOC) {
3103                 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3104                         asoc->default_stream = info.snd_sid;
3105                         asoc->default_flags = info.snd_flags;
3106                         asoc->default_ppid = info.snd_ppid;
3107                         asoc->default_context = info.snd_context;
3108                 }
3109         }
3110 
3111         return 0;
3112 }
3113 
3114 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3115  *
3116  * Requests that the local SCTP stack use the enclosed peer address as
3117  * the association primary.  The enclosed address must be one of the
3118  * association peer's addresses.
3119  */
3120 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3121                                         unsigned int optlen)
3122 {
3123         struct sctp_prim prim;
3124         struct sctp_transport *trans;
3125         struct sctp_af *af;
3126         int err;
3127 
3128         if (optlen != sizeof(struct sctp_prim))
3129                 return -EINVAL;
3130 
3131         if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3132                 return -EFAULT;
3133 
3134         /* Allow security module to validate address but need address len. */
3135         af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3136         if (!af)
3137                 return -EINVAL;
3138 
3139         err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3140                                          (struct sockaddr *)&prim.ssp_addr,
3141                                          af->sockaddr_len);
3142         if (err)
3143                 return err;
3144 
3145         trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3146         if (!trans)
3147                 return -EINVAL;
3148 
3149         sctp_assoc_set_primary(trans->asoc, trans);
3150 
3151         return 0;
3152 }
3153 
3154 /*
3155  * 7.1.5 SCTP_NODELAY
3156  *
3157  * Turn on/off any Nagle-like algorithm.  This means that packets are
3158  * generally sent as soon as possible and no unnecessary delays are
3159  * introduced, at the cost of more packets in the network.  Expects an
3160  *  integer boolean flag.
3161  */
3162 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3163                                    unsigned int optlen)
3164 {
3165         int val;
3166 
3167         if (optlen < sizeof(int))
3168                 return -EINVAL;
3169         if (get_user(val, (int __user *)optval))
3170                 return -EFAULT;
3171 
3172         sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3173         return 0;
3174 }
3175 
3176 /*
3177  *
3178  * 7.1.1 SCTP_RTOINFO
3179  *
3180  * The protocol parameters used to initialize and bound retransmission
3181  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3182  * and modify these parameters.
3183  * All parameters are time values, in milliseconds.  A value of 0, when
3184  * modifying the parameters, indicates that the current value should not
3185  * be changed.
3186  *
3187  */
3188 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3189 {
3190         struct sctp_rtoinfo rtoinfo;
3191         struct sctp_association *asoc;
3192         unsigned long rto_min, rto_max;
3193         struct sctp_sock *sp = sctp_sk(sk);
3194 
3195         if (optlen != sizeof (struct sctp_rtoinfo))
3196                 return -EINVAL;
3197 
3198         if (copy_from_user(&rtoinfo, optval, optlen))
3199                 return -EFAULT;
3200 
3201         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3202 
3203         /* Set the values to the specific association */
3204         if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
3205             sctp_style(sk, UDP))
3206                 return -EINVAL;
3207 
3208         rto_max = rtoinfo.srto_max;
3209         rto_min = rtoinfo.srto_min;
3210 
3211         if (rto_max)
3212                 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3213         else
3214                 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3215 
3216         if (rto_min)
3217                 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3218         else
3219                 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3220 
3221         if (rto_min > rto_max)
3222                 return -EINVAL;
3223 
3224         if (asoc) {
3225                 if (rtoinfo.srto_initial != 0)
3226                         asoc->rto_initial =
3227                                 msecs_to_jiffies(rtoinfo.srto_initial);
3228                 asoc->rto_max = rto_max;
3229                 asoc->rto_min = rto_min;
3230         } else {
3231                 /* If there is no association or the association-id = 0
3232                  * set the values to the endpoint.
3233                  */
3234                 if (rtoinfo.srto_initial != 0)
3235                         sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3236                 sp->rtoinfo.srto_max = rto_max;
3237                 sp->rtoinfo.srto_min = rto_min;
3238         }
3239 
3240         return 0;
3241 }
3242 
3243 /*
3244  *
3245  * 7.1.2 SCTP_ASSOCINFO
3246  *
3247  * This option is used to tune the maximum retransmission attempts
3248  * of the association.
3249  * Returns an error if the new association retransmission value is
3250  * greater than the sum of the retransmission value  of the peer.
3251  * See [SCTP] for more information.
3252  *
3253  */
3254 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3255 {
3256 
3257         struct sctp_assocparams assocparams;
3258         struct sctp_association *asoc;
3259 
3260         if (optlen != sizeof(struct sctp_assocparams))
3261                 return -EINVAL;
3262         if (copy_from_user(&assocparams, optval, optlen))
3263                 return -EFAULT;
3264 
3265         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3266 
3267         if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3268             sctp_style(sk, UDP))
3269                 return -EINVAL;
3270 
3271         /* Set the values to the specific association */
3272         if (asoc) {
3273                 if (assocparams.sasoc_asocmaxrxt != 0) {
3274                         __u32 path_sum = 0;
3275                         int   paths = 0;
3276                         struct sctp_transport *peer_addr;
3277 
3278                         list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3279                                         transports) {
3280                                 path_sum += peer_addr->pathmaxrxt;
3281                                 paths++;
3282                         }
3283 
3284                         /* Only validate asocmaxrxt if we have more than
3285                          * one path/transport.  We do this because path
3286                          * retransmissions are only counted when we have more
3287                          * then one path.
3288                          */
3289                         if (paths > 1 &&
3290                             assocparams.sasoc_asocmaxrxt > path_sum)
3291                                 return -EINVAL;
3292 
3293                         asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3294                 }
3295 
3296                 if (assocparams.sasoc_cookie_life != 0)
3297                         asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3298         } else {
3299                 /* Set the values to the endpoint */
3300                 struct sctp_sock *sp = sctp_sk(sk);
3301 
3302                 if (assocparams.sasoc_asocmaxrxt != 0)
3303                         sp->assocparams.sasoc_asocmaxrxt =
3304                                                 assocparams.sasoc_asocmaxrxt;
3305                 if (assocparams.sasoc_cookie_life != 0)
3306                         sp->assocparams.sasoc_cookie_life =
3307                                                 assocparams.sasoc_cookie_life;
3308         }
3309         return 0;
3310 }
3311 
3312 /*
3313  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3314  *
3315  * This socket option is a boolean flag which turns on or off mapped V4
3316  * addresses.  If this option is turned on and the socket is type
3317  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3318  * If this option is turned off, then no mapping will be done of V4
3319  * addresses and a user will receive both PF_INET6 and PF_INET type
3320  * addresses on the socket.
3321  */
3322 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3323 {
3324         int val;
3325         struct sctp_sock *sp = sctp_sk(sk);
3326 
3327         if (optlen < sizeof(int))
3328                 return -EINVAL;
3329         if (get_user(val, (int __user *)optval))
3330                 return -EFAULT;
3331         if (val)
3332                 sp->v4mapped = 1;
3333         else
3334                 sp->v4mapped = 0;
3335 
3336         return 0;
3337 }
3338 
3339 /*
3340  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3341  * This option will get or set the maximum size to put in any outgoing
3342  * SCTP DATA chunk.  If a message is larger than this size it will be
3343  * fragmented by SCTP into the specified size.  Note that the underlying
3344  * SCTP implementation may fragment into smaller sized chunks when the
3345  * PMTU of the underlying association is smaller than the value set by
3346  * the user.  The default value for this option is '' which indicates
3347  * the user is NOT limiting fragmentation and only the PMTU will effect
3348  * SCTP's choice of DATA chunk size.  Note also that values set larger
3349  * than the maximum size of an IP datagram will effectively let SCTP
3350  * control fragmentation (i.e. the same as setting this option to 0).
3351  *
3352  * The following structure is used to access and modify this parameter:
3353  *
3354  * struct sctp_assoc_value {
3355  *   sctp_assoc_t assoc_id;
3356  *   uint32_t assoc_value;
3357  * };
3358  *
3359  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3360  *    For one-to-many style sockets this parameter indicates which
3361  *    association the user is performing an action upon.  Note that if
3362  *    this field's value is zero then the endpoints default value is
3363  *    changed (effecting future associations only).
3364  * assoc_value:  This parameter specifies the maximum size in bytes.
3365  */
3366 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3367 {
3368         struct sctp_sock *sp = sctp_sk(sk);
3369         struct sctp_assoc_value params;
3370         struct sctp_association *asoc;
3371         int val;
3372 
3373         if (optlen == sizeof(int)) {
3374                 pr_warn_ratelimited(DEPRECATED
3375                                     "%s (pid %d) "
3376                                     "Use of int in maxseg socket option.\n"
3377                                     "Use struct sctp_assoc_value instead\n",
3378                                     current->comm, task_pid_nr(current));
3379                 if (copy_from_user(&val, optval, optlen))
3380                         return -EFAULT;
3381                 params.assoc_id = SCTP_FUTURE_ASSOC;
3382         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3383                 if (copy_from_user(&params, optval, optlen))
3384                         return -EFAULT;
3385                 val = params.assoc_value;
3386         } else {
3387                 return -EINVAL;
3388         }
3389 
3390         asoc = sctp_id2assoc(sk, params.assoc_id);
3391         if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
3392             sctp_style(sk, UDP))
3393                 return -EINVAL;
3394 
3395         if (val) {
3396                 int min_len, max_len;
3397                 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3398                                  sizeof(struct sctp_data_chunk);
3399 
3400                 min_len = sctp_min_frag_point(sp, datasize);
3401                 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3402 
3403                 if (val < min_len || val > max_len)
3404                         return -EINVAL;
3405         }
3406 
3407         if (asoc) {
3408                 asoc->user_frag = val;
3409                 sctp_assoc_update_frag_point(asoc);
3410         } else {
3411                 sp->user_frag = val;
3412         }
3413 
3414         return 0;
3415 }
3416 
3417 
3418 /*
3419  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3420  *
3421  *   Requests that the peer mark the enclosed address as the association
3422  *   primary. The enclosed address must be one of the association's
3423  *   locally bound addresses. The following structure is used to make a
3424  *   set primary request:
3425  */
3426 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3427                                              unsigned int optlen)
3428 {
3429         struct net *net = sock_net(sk);
3430         struct sctp_sock        *sp;
3431         struct sctp_association *asoc = NULL;
3432         struct sctp_setpeerprim prim;
3433         struct sctp_chunk       *chunk;
3434         struct sctp_af          *af;
3435         int                     err;
3436 
3437         sp = sctp_sk(sk);
3438 
3439         if (!net->sctp.addip_enable)
3440                 return -EPERM;
3441 
3442         if (optlen != sizeof(struct sctp_setpeerprim))
3443                 return -EINVAL;
3444 
3445         if (copy_from_user(&prim, optval, optlen))
3446                 return -EFAULT;
3447 
3448         asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3449         if (!asoc)
3450                 return -EINVAL;
3451 
3452         if (!asoc->peer.asconf_capable)
3453                 return -EPERM;
3454 
3455         if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3456                 return -EPERM;
3457 
3458         if (!sctp_state(asoc, ESTABLISHED))
3459                 return -ENOTCONN;
3460 
3461         af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3462         if (!af)
3463                 return -EINVAL;
3464 
3465         if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3466                 return -EADDRNOTAVAIL;
3467 
3468         if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3469                 return -EADDRNOTAVAIL;
3470 
3471         /* Allow security module to validate address. */
3472         err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3473                                          (struct sockaddr *)&prim.sspp_addr,
3474                                          af->sockaddr_len);
3475         if (err)
3476                 return err;
3477 
3478         /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3479         chunk = sctp_make_asconf_set_prim(asoc,
3480                                           (union sctp_addr *)&prim.sspp_addr);
3481         if (!chunk)
3482                 return -ENOMEM;
3483 
3484         err = sctp_send_asconf(asoc, chunk);
3485 
3486         pr_debug("%s: we set peer primary addr primitively\n", __func__);
3487 
3488         return err;
3489 }
3490 
3491 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3492                                             unsigned int optlen)
3493 {
3494         struct sctp_setadaptation adaptation;
3495 
3496         if (optlen != sizeof(struct sctp_setadaptation))
3497                 return -EINVAL;
3498         if (copy_from_user(&adaptation, optval, optlen))
3499                 return -EFAULT;
3500 
3501         sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3502 
3503         return 0;
3504 }
3505 
3506 /*
3507  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3508  *
3509  * The context field in the sctp_sndrcvinfo structure is normally only
3510  * used when a failed message is retrieved holding the value that was
3511  * sent down on the actual send call.  This option allows the setting of
3512  * a default context on an association basis that will be received on
3513  * reading messages from the peer.  This is especially helpful in the
3514  * one-2-many model for an application to keep some reference to an
3515  * internal state machine that is processing messages on the
3516  * association.  Note that the setting of this value only effects
3517  * received messages from the peer and does not effect the value that is
3518  * saved with outbound messages.
3519  */
3520 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3521                                    unsigned int optlen)
3522 {
3523         struct sctp_sock *sp = sctp_sk(sk);
3524         struct sctp_assoc_value params;
3525         struct sctp_association *asoc;
3526 
3527         if (optlen != sizeof(struct sctp_assoc_value))
3528                 return -EINVAL;
3529         if (copy_from_user(&params, optval, optlen))
3530                 return -EFAULT;
3531 
3532         asoc = sctp_id2assoc(sk, params.assoc_id);
3533         if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3534             sctp_style(sk, UDP))
3535                 return -EINVAL;
3536 
3537         if (asoc) {
3538                 asoc->default_rcv_context = params.assoc_value;
3539 
3540                 return 0;
3541         }
3542 
3543         if (sctp_style(sk, TCP))
3544                 params.assoc_id = SCTP_FUTURE_ASSOC;
3545 
3546         if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3547             params.assoc_id == SCTP_ALL_ASSOC)
3548                 sp->default_rcv_context = params.assoc_value;
3549 
3550         if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3551             params.assoc_id == SCTP_ALL_ASSOC)
3552                 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3553                         asoc->default_rcv_context = params.assoc_value;
3554 
3555         return 0;
3556 }
3557 
3558 /*
3559  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3560  *
3561  * This options will at a minimum specify if the implementation is doing
3562  * fragmented interleave.  Fragmented interleave, for a one to many
3563  * socket, is when subsequent calls to receive a message may return
3564  * parts of messages from different associations.  Some implementations
3565  * may allow you to turn this value on or off.  If so, when turned off,
3566  * no fragment interleave will occur (which will cause a head of line
3567  * blocking amongst multiple associations sharing the same one to many
3568  * socket).  When this option is turned on, then each receive call may
3569  * come from a different association (thus the user must receive data
3570  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3571  * association each receive belongs to.
3572  *
3573  * This option takes a boolean value.  A non-zero value indicates that
3574  * fragmented interleave is on.  A value of zero indicates that
3575  * fragmented interleave is off.
3576  *
3577  * Note that it is important that an implementation that allows this
3578  * option to be turned on, have it off by default.  Otherwise an unaware
3579  * application using the one to many model may become confused and act
3580  * incorrectly.
3581  */
3582 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3583                                                char __user *optval,
3584                                                unsigned int optlen)
3585 {
3586         int val;
3587 
3588         if (optlen != sizeof(int))
3589                 return -EINVAL;
3590         if (get_user(val, (int __user *)optval))
3591                 return -EFAULT;
3592 
3593         sctp_sk(sk)->frag_interleave = !!val;
3594 
3595         if (!sctp_sk(sk)->frag_interleave)
3596                 sctp_sk(sk)->strm_interleave = 0;
3597 
3598         return 0;
3599 }
3600 
3601 /*
3602  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3603  *       (SCTP_PARTIAL_DELIVERY_POINT)
3604  *
3605  * This option will set or get the SCTP partial delivery point.  This
3606  * point is the size of a message where the partial delivery API will be
3607  * invoked to help free up rwnd space for the peer.  Setting this to a
3608  * lower value will cause partial deliveries to happen more often.  The
3609  * calls argument is an integer that sets or gets the partial delivery
3610  * point.  Note also that the call will fail if the user attempts to set
3611  * this value larger than the socket receive buffer size.
3612  *
3613  * Note that any single message having a length smaller than or equal to
3614  * the SCTP partial delivery point will be delivered in one single read
3615  * call as long as the user provided buffer is large enough to hold the
3616  * message.
3617  */
3618 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3619                                                   char __user *optval,
3620                                                   unsigned int optlen)
3621 {
3622         u32 val;
3623 
3624         if (optlen != sizeof(u32))
3625                 return -EINVAL;
3626         if (get_user(val, (int __user *)optval))
3627                 return -EFAULT;
3628 
3629         /* Note: We double the receive buffer from what the user sets
3630          * it to be, also initial rwnd is based on rcvbuf/2.
3631          */
3632         if (val > (sk->sk_rcvbuf >> 1))
3633                 return -EINVAL;
3634 
3635         sctp_sk(sk)->pd_point = val;
3636 
3637         return 0; /* is this the right error code? */
3638 }
3639 
3640 /*
3641  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3642  *
3643  * This option will allow a user to change the maximum burst of packets
3644  * that can be emitted by this association.  Note that the default value
3645  * is 4, and some implementations may restrict this setting so that it
3646  * can only be lowered.
3647  *
3648  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3649  * future associations inheriting the socket value.
3650  */
3651 static int sctp_setsockopt_maxburst(struct sock *sk,
3652                                     char __user *optval,
3653                                     unsigned int optlen)
3654 {
3655         struct sctp_sock *sp = sctp_sk(sk);
3656         struct sctp_assoc_value params;
3657         struct sctp_association *asoc;
3658 
3659         if (optlen == sizeof(int)) {
3660                 pr_warn_ratelimited(DEPRECATED
3661                                     "%s (pid %d) "
3662                                     "Use of int in max_burst socket option deprecated.\n"
3663                                     "Use struct sctp_assoc_value instead\n",
3664                                     current->comm, task_pid_nr(current));
3665                 if (copy_from_user(&params.assoc_value, optval, optlen))
3666                         return -EFAULT;
3667                 params.assoc_id = SCTP_FUTURE_ASSOC;
3668         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3669                 if (copy_from_user(&params, optval, optlen))
3670                         return -EFAULT;
3671         } else
3672                 return -EINVAL;
3673 
3674         asoc = sctp_id2assoc(sk, params.assoc_id);
3675         if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
3676             sctp_style(sk, UDP))
3677                 return -EINVAL;
3678 
3679         if (asoc) {
3680                 asoc->max_burst = params.assoc_value;
3681 
3682                 return 0;
3683         }
3684 
3685         if (sctp_style(sk, TCP))
3686                 params.assoc_id = SCTP_FUTURE_ASSOC;
3687 
3688         if (params.assoc_id == SCTP_FUTURE_ASSOC ||
3689             params.assoc_id == SCTP_ALL_ASSOC)
3690                 sp->max_burst = params.assoc_value;
3691 
3692         if (params.assoc_id == SCTP_CURRENT_ASSOC ||
3693             params.assoc_id == SCTP_ALL_ASSOC)
3694                 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3695                         asoc->max_burst = params.assoc_value;
3696 
3697         return 0;
3698 }
3699 
3700 /*
3701  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3702  *
3703  * This set option adds a chunk type that the user is requesting to be
3704  * received only in an authenticated way.  Changes to the list of chunks
3705  * will only effect future associations on the socket.
3706  */
3707 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3708                                       char __user *optval,
3709                                       unsigned int optlen)
3710 {
3711         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3712         struct sctp_authchunk val;
3713 
3714         if (!ep->auth_enable)
3715                 return -EACCES;
3716 
3717         if (optlen != sizeof(struct sctp_authchunk))
3718                 return -EINVAL;
3719         if (copy_from_user(&val, optval, optlen))
3720                 return -EFAULT;
3721 
3722         switch (val.sauth_chunk) {
3723         case SCTP_CID_INIT:
3724         case SCTP_CID_INIT_ACK:
3725         case SCTP_CID_SHUTDOWN_COMPLETE:
3726         case SCTP_CID_AUTH:
3727                 return -EINVAL;
3728         }
3729 
3730         /* add this chunk id to the endpoint */
3731         return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3732 }
3733 
3734 /*
3735  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3736  *
3737  * This option gets or sets the list of HMAC algorithms that the local
3738  * endpoint requires the peer to use.
3739  */
3740 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3741                                       char __user *optval,
3742                                       unsigned int optlen)
3743 {
3744         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3745         struct sctp_hmacalgo *hmacs;
3746         u32 idents;
3747         int err;
3748 
3749         if (!ep->auth_enable)
3750                 return -EACCES;
3751 
3752         if (optlen < sizeof(struct sctp_hmacalgo))
3753                 return -EINVAL;
3754         optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3755                                              SCTP_AUTH_NUM_HMACS * sizeof(u16));
3756 
3757         hmacs = memdup_user(optval, optlen);
3758         if (IS_ERR(hmacs))
3759                 return PTR_ERR(hmacs);
3760 
3761         idents = hmacs->shmac_num_idents;
3762         if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3763             (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3764                 err = -EINVAL;
3765                 goto out;
3766         }
3767 
3768         err = sctp_auth_ep_set_hmacs(ep, hmacs);
3769 out:
3770         kfree(hmacs);
3771         return err;
3772 }
3773 
3774 /*
3775  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3776  *
3777  * This option will set a shared secret key which is used to build an
3778  * association shared key.
3779  */
3780 static int sctp_setsockopt_auth_key(struct sock *sk,
3781                                     char __user *optval,
3782                                     unsigned int optlen)
3783 {
3784         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3785         struct sctp_authkey *authkey;
3786         struct sctp_association *asoc;
3787         int ret = -EINVAL;
3788 
3789         if (!ep->auth_enable)
3790                 return -EACCES;
3791 
3792         if (optlen <= sizeof(struct sctp_authkey))
3793                 return -EINVAL;
3794         /* authkey->sca_keylength is u16, so optlen can't be bigger than
3795          * this.
3796          */
3797         optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3798 
3799         authkey = memdup_user(optval, optlen);
3800         if (IS_ERR(authkey))
3801                 return PTR_ERR(authkey);
3802 
3803         if (authkey->sca_keylength > optlen - sizeof(*authkey))
3804                 goto out;
3805 
3806         asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3807         if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3808             sctp_style(sk, UDP))
3809                 goto out;
3810 
3811         if (asoc) {
3812                 ret = sctp_auth_set_key(ep, asoc, authkey);
3813                 goto out;
3814         }
3815 
3816         if (sctp_style(sk, TCP))
3817                 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3818 
3819         if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3820             authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3821                 ret = sctp_auth_set_key(ep, asoc, authkey);
3822                 if (ret)
3823                         goto out;
3824         }
3825 
3826         ret = 0;
3827 
3828         if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3829             authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3830                 list_for_each_entry(asoc, &ep->asocs, asocs) {
3831                         int res = sctp_auth_set_key(ep, asoc, authkey);
3832 
3833                         if (res && !ret)
3834                                 ret = res;
3835                 }
3836         }
3837 
3838 out:
3839         kzfree(authkey);
3840         return ret;
3841 }
3842 
3843 /*
3844  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3845  *
3846  * This option will get or set the active shared key to be used to build
3847  * the association shared key.
3848  */
3849 static int sctp_setsockopt_active_key(struct sock *sk,
3850                                       char __user *optval,
3851                                       unsigned int optlen)
3852 {
3853         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3854         struct sctp_association *asoc;
3855         struct sctp_authkeyid val;
3856         int ret = 0;
3857 
3858         if (!ep->auth_enable)
3859                 return -EACCES;
3860 
3861         if (optlen != sizeof(struct sctp_authkeyid))
3862                 return -EINVAL;
3863         if (copy_from_user(&val, optval, optlen))
3864                 return -EFAULT;
3865 
3866         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3867         if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3868             sctp_style(sk, UDP))
3869                 return -EINVAL;
3870 
3871         if (asoc)
3872                 return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3873 
3874         if (sctp_style(sk, TCP))
3875                 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3876 
3877         if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3878             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3879                 ret = sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3880                 if (ret)
3881                         return ret;
3882         }
3883 
3884         if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3885             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3886                 list_for_each_entry(asoc, &ep->asocs, asocs) {
3887                         int res = sctp_auth_set_active_key(ep, asoc,
3888                                                            val.scact_keynumber);
3889 
3890                         if (res && !ret)
3891                                 ret = res;
3892                 }
3893         }
3894 
3895         return ret;
3896 }
3897 
3898 /*
3899  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3900  *
3901  * This set option will delete a shared secret key from use.
3902  */
3903 static int sctp_setsockopt_del_key(struct sock *sk,
3904                                    char __user *optval,
3905                                    unsigned int optlen)
3906 {
3907         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3908         struct sctp_association *asoc;
3909         struct sctp_authkeyid val;
3910         int ret = 0;
3911 
3912         if (!ep->auth_enable)
3913                 return -EACCES;
3914 
3915         if (optlen != sizeof(struct sctp_authkeyid))
3916                 return -EINVAL;
3917         if (copy_from_user(&val, optval, optlen))
3918                 return -EFAULT;
3919 
3920         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3921         if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3922             sctp_style(sk, UDP))
3923                 return -EINVAL;
3924 
3925         if (asoc)
3926                 return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3927 
3928         if (sctp_style(sk, TCP))
3929                 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3930 
3931         if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3932             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3933                 ret = sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3934                 if (ret)
3935                         return ret;
3936         }
3937 
3938         if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3939             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3940                 list_for_each_entry(asoc, &ep->asocs, asocs) {
3941                         int res = sctp_auth_del_key_id(ep, asoc,
3942                                                        val.scact_keynumber);
3943 
3944                         if (res && !ret)
3945                                 ret = res;
3946                 }
3947         }
3948 
3949         return ret;
3950 }
3951 
3952 /*
3953  * 8.3.4  Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3954  *
3955  * This set option will deactivate a shared secret key.
3956  */
3957 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3958                                           unsigned int optlen)
3959 {
3960         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3961         struct sctp_association *asoc;
3962         struct sctp_authkeyid val;
3963         int ret = 0;
3964 
3965         if (!ep->auth_enable)
3966                 return -EACCES;
3967 
3968         if (optlen != sizeof(struct sctp_authkeyid))
3969                 return -EINVAL;
3970         if (copy_from_user(&val, optval, optlen))
3971                 return -EFAULT;
3972 
3973         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3974         if (!asoc && val.scact_assoc_id > SCTP_ALL_ASSOC &&
3975             sctp_style(sk, UDP))
3976                 return -EINVAL;
3977 
3978         if (asoc)
3979                 return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3980 
3981         if (sctp_style(sk, TCP))
3982                 val.scact_assoc_id = SCTP_FUTURE_ASSOC;
3983 
3984         if (val.scact_assoc_id == SCTP_FUTURE_ASSOC ||
3985             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3986                 ret = sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3987                 if (ret)
3988                         return ret;
3989         }
3990 
3991         if (val.scact_assoc_id == SCTP_CURRENT_ASSOC ||
3992             val.scact_assoc_id == SCTP_ALL_ASSOC) {
3993                 list_for_each_entry(asoc, &ep->asocs, asocs) {
3994                         int res = sctp_auth_deact_key_id(ep, asoc,
3995                                                          val.scact_keynumber);
3996 
3997                         if (res && !ret)
3998                                 ret = res;
3999                 }
4000         }
4001 
4002         return ret;
4003 }
4004 
4005 /*
4006  * 8.1.23 SCTP_AUTO_ASCONF
4007  *
4008  * This option will enable or disable the use of the automatic generation of
4009  * ASCONF chunks to add and delete addresses to an existing association.  Note
4010  * that this option has two caveats namely: a) it only affects sockets that
4011  * are bound to all addresses available to the SCTP stack, and b) the system
4012  * administrator may have an overriding control that turns the ASCONF feature
4013  * off no matter what setting the socket option may have.
4014  * This option expects an integer boolean flag, where a non-zero value turns on
4015  * the option, and a zero value turns off the option.
4016  * Note. In this implementation, socket operation overrides default parameter
4017  * being set by sysctl as well as FreeBSD implementation
4018  */
4019 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
4020                                         unsigned int optlen)
4021 {
4022         int val;
4023         struct sctp_sock *sp = sctp_sk(sk);
4024 
4025         if (optlen < sizeof(int))
4026                 return -EINVAL;
4027         if (get_user(val, (int __user *)optval))
4028                 return -EFAULT;
4029         if (!sctp_is_ep_boundall(sk) && val)
4030                 return -EINVAL;
4031         if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
4032                 return 0;
4033 
4034         spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
4035         if (val == 0 && sp->do_auto_asconf) {
4036                 list_del(&sp->auto_asconf_list);
4037                 sp->do_auto_asconf = 0;
4038         } else if (val && !sp->do_auto_asconf) {
4039                 list_add_tail(&sp->auto_asconf_list,
4040                     &sock_net(sk)->sctp.auto_asconf_splist);
4041                 sp->do_auto_asconf = 1;
4042         }
4043         spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
4044         return 0;
4045 }
4046 
4047 /*
4048  * SCTP_PEER_ADDR_THLDS
4049  *
4050  * This option allows us to alter the partially failed threshold for one or all
4051  * transports in an association.  See Section 6.1 of:
4052  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
4053  */
4054 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
4055                                             char __user *optval,
4056                                             unsigned int optlen)
4057 {
4058         struct sctp_paddrthlds val;
4059         struct sctp_transport *trans;
4060         struct sctp_association *asoc;
4061 
4062         if (optlen < sizeof(struct sctp_paddrthlds))
4063                 return -EINVAL;
4064         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
4065                            sizeof(struct sctp_paddrthlds)))
4066                 return -EFAULT;
4067 
4068         if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
4069                 trans = sctp_addr_id2transport(sk, &val.spt_address,
4070                                                val.spt_assoc_id);
4071                 if (!trans)
4072                         return -ENOENT;
4073 
4074                 if (val.spt_pathmaxrxt)
4075                         trans->pathmaxrxt = val.spt_pathmaxrxt;
4076                 trans->pf_retrans = val.spt_pathpfthld;
4077 
4078                 return 0;
4079         }
4080 
4081         asoc = sctp_id2assoc(sk, val.spt_assoc_id);
4082         if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
4083             sctp_style(sk, UDP))
4084                 return -EINVAL;
4085 
4086         if (asoc) {
4087                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
4088                                     transports) {
4089                         if (val.spt_pathmaxrxt)
4090                                 trans->pathmaxrxt = val.spt_pathmaxrxt;
4091                         trans->pf_retrans = val.spt_pathpfthld;
4092                 }
4093 
4094                 if (val.spt_pathmaxrxt)
4095                         asoc->pathmaxrxt = val.spt_pathmaxrxt;
4096                 asoc->pf_retrans = val.spt_pathpfthld;
4097         } else {
4098                 struct sctp_sock *sp = sctp_sk(sk);
4099 
4100                 if (val.spt_pathmaxrxt)
4101                         sp->pathmaxrxt = val.spt_pathmaxrxt;
4102                 sp->pf_retrans = val.spt_pathpfthld;
4103         }
4104 
4105         return 0;
4106 }
4107 
4108 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
4109                                        char __user *optval,
4110                                        unsigned int optlen)
4111 {
4112         int val;
4113 
4114         if (optlen < sizeof(int))
4115                 return -EINVAL;
4116         if (get_user(val, (int __user *) optval))
4117                 return -EFAULT;
4118 
4119         sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
4120 
4121         return 0;
4122 }
4123 
4124 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
4125                                        char __user *optval,
4126                                        unsigned int optlen)
4127 {
4128         int val;
4129 
4130         if (optlen < sizeof(int))
4131                 return -EINVAL;
4132         if (get_user(val, (int __user *) optval))
4133                 return -EFAULT;
4134 
4135         sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
4136 
4137         return 0;
4138 }
4139 
4140 static int sctp_setsockopt_pr_supported(struct sock *sk,
4141                                         char __user *optval,
4142                                         unsigned int optlen)
4143 {
4144         struct sctp_assoc_value params;
4145         struct sctp_association *asoc;
4146 
4147         if (optlen != sizeof(params))
4148                 return -EINVAL;
4149 
4150         if (copy_from_user(&params, optval, optlen))
4151                 return -EFAULT;
4152 
4153         asoc = sctp_id2assoc(sk, params.assoc_id);
4154         if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4155             sctp_style(sk, UDP))
4156                 return -EINVAL;
4157 
4158         sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
4159 
4160         return 0;
4161 }
4162 
4163 static int sctp_setsockopt_default_prinfo(struct sock *sk,
4164                                           char __user *optval,
4165                                           unsigned int optlen)
4166 {
4167         struct sctp_sock *sp = sctp_sk(sk);
4168         struct sctp_default_prinfo info;
4169         struct sctp_association *asoc;
4170         int retval = -EINVAL;
4171 
4172         if (optlen != sizeof(info))
4173                 goto out;
4174 
4175         if (copy_from_user(&info, optval, sizeof(info))) {
4176                 retval = -EFAULT;
4177                 goto out;
4178         }
4179 
4180         if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
4181                 goto out;
4182 
4183         if (info.pr_policy == SCTP_PR_SCTP_NONE)
4184                 info.pr_value = 0;
4185 
4186         asoc = sctp_id2assoc(sk, info.pr_assoc_id);
4187         if (!asoc && info.pr_assoc_id > SCTP_ALL_ASSOC &&
4188             sctp_style(sk, UDP))
4189                 goto out;
4190 
4191         retval = 0;
4192 
4193         if (asoc) {
4194                 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4195                 asoc->default_timetolive = info.pr_value;
4196                 goto out;
4197         }
4198 
4199         if (sctp_style(sk, TCP))
4200                 info.pr_assoc_id = SCTP_FUTURE_ASSOC;
4201 
4202         if (info.pr_assoc_id == SCTP_FUTURE_ASSOC ||
4203             info.pr_assoc_id == SCTP_ALL_ASSOC) {
4204                 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
4205                 sp->default_timetolive = info.pr_value;
4206         }
4207 
4208         if (info.pr_assoc_id == SCTP_CURRENT_ASSOC ||
4209             info.pr_assoc_id == SCTP_ALL_ASSOC) {
4210                 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4211                         SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
4212                         asoc->default_timetolive = info.pr_value;
4213                 }
4214         }
4215 
4216 out:
4217         return retval;
4218 }
4219 
4220 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4221                                               char __user *optval,
4222                                               unsigned int optlen)
4223 {
4224         struct sctp_assoc_value params;
4225         struct sctp_association *asoc;
4226         int retval = -EINVAL;
4227 
4228         if (optlen != sizeof(params))
4229                 goto out;
4230 
4231         if (copy_from_user(&params, optval, optlen)) {
4232                 retval = -EFAULT;
4233                 goto out;
4234         }
4235 
4236         asoc = sctp_id2assoc(sk, params.assoc_id);
4237         if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4238             sctp_style(sk, UDP))
4239                 goto out;
4240 
4241         if (asoc)
4242                 asoc->reconf_enable = !!params.assoc_value;
4243         else
4244                 sctp_sk(sk)->ep->reconf_enable = !!params.assoc_value;
4245 
4246         retval = 0;
4247 
4248 out:
4249         return retval;
4250 }
4251 
4252 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4253                                            char __user *optval,
4254                                            unsigned int optlen)
4255 {
4256         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4257         struct sctp_assoc_value params;
4258         struct sctp_association *asoc;
4259         int retval = -EINVAL;
4260 
4261         if (optlen != sizeof(params))
4262                 goto out;
4263 
4264         if (copy_from_user(&params, optval, optlen)) {
4265                 retval = -EFAULT;
4266                 goto out;
4267         }
4268 
4269         if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4270                 goto out;
4271 
4272         asoc = sctp_id2assoc(sk, params.assoc_id);
4273         if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4274             sctp_style(sk, UDP))
4275                 goto out;
4276 
4277         retval = 0;
4278 
4279         if (asoc) {
4280                 asoc->strreset_enable = params.assoc_value;
4281                 goto out;
4282         }
4283 
4284         if (sctp_style(sk, TCP))
4285                 params.assoc_id = SCTP_FUTURE_ASSOC;
4286 
4287         if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4288             params.assoc_id == SCTP_ALL_ASSOC)
4289                 ep->strreset_enable = params.assoc_value;
4290 
4291         if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4292             params.assoc_id == SCTP_ALL_ASSOC)
4293                 list_for_each_entry(asoc, &ep->asocs, asocs)
4294                         asoc->strreset_enable = params.assoc_value;
4295 
4296 out:
4297         return retval;
4298 }
4299 
4300 static int sctp_setsockopt_reset_streams(struct sock *sk,
4301                                          char __user *optval,
4302                                          unsigned int optlen)
4303 {
4304         struct sctp_reset_streams *params;
4305         struct sctp_association *asoc;
4306         int retval = -EINVAL;
4307 
4308         if (optlen < sizeof(*params))
4309                 return -EINVAL;
4310         /* srs_number_streams is u16, so optlen can't be bigger than this. */
4311         optlen = min_t(unsigned int, optlen, USHRT_MAX +
4312                                              sizeof(__u16) * sizeof(*params));
4313 
4314         params = memdup_user(optval, optlen);
4315         if (IS_ERR(params))
4316                 return PTR_ERR(params);
4317 
4318         if (params->srs_number_streams * sizeof(__u16) >
4319             optlen - sizeof(*params))
4320                 goto out;
4321 
4322         asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4323         if (!asoc)
4324                 goto out;
4325 
4326         retval = sctp_send_reset_streams(asoc, params);
4327 
4328 out:
4329         kfree(params);
4330         return retval;
4331 }
4332 
4333 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4334                                        char __user *optval,
4335                                        unsigned int optlen)
4336 {
4337         struct sctp_association *asoc;
4338         sctp_assoc_t associd;
4339         int retval = -EINVAL;
4340 
4341         if (optlen != sizeof(associd))
4342                 goto out;
4343 
4344         if (copy_from_user(&associd, optval, optlen)) {
4345                 retval = -EFAULT;
4346                 goto out;
4347         }
4348 
4349         asoc = sctp_id2assoc(sk, associd);
4350         if (!asoc)
4351                 goto out;
4352 
4353         retval = sctp_send_reset_assoc(asoc);
4354 
4355 out:
4356         return retval;
4357 }
4358 
4359 static int sctp_setsockopt_add_streams(struct sock *sk,
4360                                        char __user *optval,
4361                                        unsigned int optlen)
4362 {
4363         struct sctp_association *asoc;
4364         struct sctp_add_streams params;
4365         int retval = -EINVAL;
4366 
4367         if (optlen != sizeof(params))
4368                 goto out;
4369 
4370         if (copy_from_user(&params, optval, optlen)) {
4371                 retval = -EFAULT;
4372                 goto out;
4373         }
4374 
4375         asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4376         if (!asoc)
4377                 goto out;
4378 
4379         retval = sctp_send_add_streams(asoc, &params);
4380 
4381 out:
4382         return retval;
4383 }
4384 
4385 static int sctp_setsockopt_scheduler(struct sock *sk,
4386                                      char __user *optval,
4387                                      unsigned int optlen)
4388 {
4389         struct sctp_sock *sp = sctp_sk(sk);
4390         struct sctp_association *asoc;
4391         struct sctp_assoc_value params;
4392         int retval = 0;
4393 
4394         if (optlen < sizeof(params))
4395                 return -EINVAL;
4396 
4397         optlen = sizeof(params);
4398         if (copy_from_user(&params, optval, optlen))
4399                 return -EFAULT;
4400 
4401         if (params.assoc_value > SCTP_SS_MAX)
4402                 return -EINVAL;
4403 
4404         asoc = sctp_id2assoc(sk, params.assoc_id);
4405         if (!asoc && params.assoc_id > SCTP_ALL_ASSOC &&
4406             sctp_style(sk, UDP))
4407                 return -EINVAL;
4408 
4409         if (asoc)
4410                 return sctp_sched_set_sched(asoc, params.assoc_value);
4411 
4412         if (sctp_style(sk, TCP))
4413                 params.assoc_id = SCTP_FUTURE_ASSOC;
4414 
4415         if (params.assoc_id == SCTP_FUTURE_ASSOC ||
4416             params.assoc_id == SCTP_ALL_ASSOC)
4417                 sp->default_ss = params.assoc_value;
4418 
4419         if (params.assoc_id == SCTP_CURRENT_ASSOC ||
4420             params.assoc_id == SCTP_ALL_ASSOC) {
4421                 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4422                         int ret = sctp_sched_set_sched(asoc,
4423                                                        params.assoc_value);
4424 
4425                         if (ret && !retval)
4426                                 retval = ret;
4427                 }
4428         }
4429 
4430         return retval;
4431 }
4432 
4433 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4434                                            char __user *optval,
4435                                            unsigned int optlen)
4436 {
4437         struct sctp_stream_value params;
4438         struct sctp_association *asoc;
4439         int retval = -EINVAL;
4440 
4441         if (optlen < sizeof(params))
4442                 goto out;
4443 
4444         optlen = sizeof(params);
4445         if (copy_from_user(&params, optval, optlen)) {
4446                 retval = -EFAULT;
4447                 goto out;
4448         }
4449 
4450         asoc = sctp_id2assoc(sk, params.assoc_id);
4451         if (!asoc && params.assoc_id != SCTP_CURRENT_ASSOC &&
4452             sctp_style(sk, UDP))
4453                 goto out;
4454 
4455         if (asoc) {
4456                 retval = sctp_sched_set_value(asoc, params.stream_id,
4457                                               params.stream_value, GFP_KERNEL);
4458                 goto out;
4459         }
4460 
4461         retval = 0;
4462 
4463         list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4464                 int ret = sctp_sched_set_value(asoc, params.stream_id,
4465                                                params.stream_value, GFP_KERNEL);
4466                 if (ret && !retval) /* try to return the 1st error. */
4467                         retval = ret;
4468         }
4469 
4470 out:
4471         return retval;
4472 }
4473 
4474 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4475                                                   char __user *optval,
4476                                                   unsigned int optlen)
4477 {
4478         struct sctp_sock *sp = sctp_sk(sk);
4479         struct sctp_assoc_value params;
4480         struct sctp_association *asoc;
4481         int retval = -EINVAL;
4482 
4483         if (optlen < sizeof(params))
4484                 goto out;
4485 
4486         optlen = sizeof(params);
4487         if (copy_from_user(&params, optval, optlen)) {
4488                 retval = -EFAULT;
4489                 goto out;
4490         }
4491 
4492         asoc = sctp_id2assoc(sk, params.assoc_id);
4493         if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
4494             sctp_style(sk, UDP))
4495                 goto out;
4496 
4497         if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4498                 retval = -EPERM;
4499                 goto out;
4500         }
4501 
4502         sp->strm_interleave = !!params.assoc_value;
4503 
4504         retval = 0;
4505 
4506 out:
4507         return retval;
4508 }
4509 
4510 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4511                                       unsigned int optlen)
4512 {
4513         int val;
4514 
4515         if (!sctp_style(sk, TCP))
4516                 return -EOPNOTSUPP;
4517 
4518         if (sctp_sk(sk)->ep->base.bind_addr.port)
4519                 return -EFAULT;
4520 
4521         if (optlen < sizeof(int))
4522                 return -EINVAL;
4523 
4524         if (get_user(val, (int __user *)optval))
4525                 return -EFAULT;
4526 
4527         sctp_sk(sk)->reuse = !!val;
4528 
4529         return 0;
4530 }
4531 
4532 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4533                                         struct sctp_association *asoc)
4534 {
4535         struct sctp_ulpevent *event;
4536 
4537         sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4538 
4539         if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4540                 if (sctp_outq_is_empty(&asoc->outqueue)) {
4541                         event = sctp_ulpevent_make_sender_dry_event(asoc,
4542                                         GFP_USER | __GFP_NOWARN);
4543                         if (!event)
4544                                 return -ENOMEM;
4545 
4546                         asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4547                 }
4548         }
4549 
4550         return 0;
4551 }
4552 
4553 static int sctp_setsockopt_event(struct sock *sk, char __user *optval,
4554                                  unsigned int optlen)
4555 {
4556         struct sctp_sock *sp = sctp_sk(sk);
4557         struct sctp_association *asoc;
4558         struct sctp_event param;
4559         int retval = 0;
4560 
4561         if (optlen < sizeof(param))
4562                 return -EINVAL;
4563 
4564         optlen = sizeof(param);
4565         if (copy_from_user(&param, optval, optlen))
4566                 return -EFAULT;
4567 
4568         if (param.se_type < SCTP_SN_TYPE_BASE ||
4569             param.se_type > SCTP_SN_TYPE_MAX)
4570                 return -EINVAL;
4571 
4572         asoc = sctp_id2assoc(sk, param.se_assoc_id);
4573         if (!asoc && param.se_assoc_id > SCTP_ALL_ASSOC &&
4574             sctp_style(sk, UDP))
4575                 return -EINVAL;
4576 
4577         if (asoc)
4578                 return sctp_assoc_ulpevent_type_set(&param, asoc);
4579 
4580         if (sctp_style(sk, TCP))
4581                 param.se_assoc_id = SCTP_FUTURE_ASSOC;
4582 
4583         if (param.se_assoc_id == SCTP_FUTURE_ASSOC ||
4584             param.se_assoc_id == SCTP_ALL_ASSOC)
4585                 sctp_ulpevent_type_set(&sp->subscribe,
4586                                        param.se_type, param.se_on);
4587 
4588         if (param.se_assoc_id == SCTP_CURRENT_ASSOC ||
4589             param.se_assoc_id == SCTP_ALL_ASSOC) {
4590                 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4591                         int ret = sctp_assoc_ulpevent_type_set(&param, asoc);
4592 
4593                         if (ret && !retval)
4594                                 retval = ret;
4595                 }
4596         }
4597 
4598         return retval;
4599 }
4600 
4601 /* API 6.2 setsockopt(), getsockopt()
4602  *
4603  * Applications use setsockopt() and getsockopt() to set or retrieve
4604  * socket options.  Socket options are used to change the default
4605  * behavior of sockets calls.  They are described in Section 7.
4606  *
4607  * The syntax is:
4608  *
4609  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
4610  *                    int __user *optlen);
4611  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4612  *                    int optlen);
4613  *
4614  *   sd      - the socket descript.
4615  *   level   - set to IPPROTO_SCTP for all SCTP options.
4616  *   optname - the option name.
4617  *   optval  - the buffer to store the value of the option.
4618  *   optlen  - the size of the buffer.
4619  */
4620 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4621                            char __user *optval, unsigned int optlen)
4622 {
4623         int retval = 0;
4624 
4625         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4626 
4627         /* I can hardly begin to describe how wrong this is.  This is
4628          * so broken as to be worse than useless.  The API draft
4629          * REALLY is NOT helpful here...  I am not convinced that the
4630          * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4631          * are at all well-founded.
4632          */
4633         if (level != SOL_SCTP) {
4634                 struct sctp_af *af = sctp_sk(sk)->pf->af;
4635                 retval = af->setsockopt(sk, level, optname, optval, optlen);
4636                 goto out_nounlock;
4637         }
4638 
4639         lock_sock(sk);
4640 
4641         switch (optname) {
4642         case SCTP_SOCKOPT_BINDX_ADD:
4643                 /* 'optlen' is the size of the addresses buffer. */
4644                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4645                                                optlen, SCTP_BINDX_ADD_ADDR);
4646                 break;
4647 
4648         case SCTP_SOCKOPT_BINDX_REM:
4649                 /* 'optlen' is the size of the addresses buffer. */
4650                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4651                                                optlen, SCTP_BINDX_REM_ADDR);
4652                 break;
4653 
4654         case SCTP_SOCKOPT_CONNECTX_OLD:
4655                 /* 'optlen' is the size of the addresses buffer. */
4656                 retval = sctp_setsockopt_connectx_old(sk,
4657                                             (struct sockaddr __user *)optval,
4658                                             optlen);
4659                 break;
4660 
4661         case SCTP_SOCKOPT_CONNECTX:
4662                 /* 'optlen' is the size of the addresses buffer. */
4663                 retval = sctp_setsockopt_connectx(sk,
4664                                             (struct sockaddr __user *)optval,
4665                                             optlen);
4666                 break;
4667 
4668         case SCTP_DISABLE_FRAGMENTS:
4669                 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4670                 break;
4671 
4672         case SCTP_EVENTS:
4673                 retval = sctp_setsockopt_events(sk, optval, optlen);
4674                 break;
4675 
4676         case SCTP_AUTOCLOSE:
4677                 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4678                 break;
4679 
4680         case SCTP_PEER_ADDR_PARAMS:
4681                 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4682                 break;
4683 
4684         case SCTP_DELAYED_SACK:
4685                 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4686                 break;
4687         case SCTP_PARTIAL_DELIVERY_POINT:
4688                 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4689                 break;
4690 
4691         case SCTP_INITMSG:
4692                 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4693                 break;
4694         case SCTP_DEFAULT_SEND_PARAM:
4695                 retval = sctp_setsockopt_default_send_param(sk, optval,
4696                                                             optlen);
4697                 break;
4698         case SCTP_DEFAULT_SNDINFO:
4699                 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4700                 break;
4701         case SCTP_PRIMARY_ADDR:
4702                 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4703                 break;
4704         case SCTP_SET_PEER_PRIMARY_ADDR:
4705                 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4706                 break;
4707         case SCTP_NODELAY:
4708                 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4709                 break;
4710         case SCTP_RTOINFO:
4711                 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4712                 break;
4713         case SCTP_ASSOCINFO:
4714                 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4715                 break;
4716         case SCTP_I_WANT_MAPPED_V4_ADDR:
4717                 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4718                 break;
4719         case SCTP_MAXSEG:
4720                 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4721                 break;
4722         case SCTP_ADAPTATION_LAYER:
4723                 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4724                 break;
4725         case SCTP_CONTEXT:
4726                 retval = sctp_setsockopt_context(sk, optval, optlen);
4727                 break;
4728         case SCTP_FRAGMENT_INTERLEAVE:
4729                 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4730                 break;
4731         case SCTP_MAX_BURST:
4732                 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4733                 break;
4734         case SCTP_AUTH_CHUNK:
4735                 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4736                 break;
4737         case SCTP_HMAC_IDENT:
4738                 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4739                 break;
4740         case SCTP_AUTH_KEY:
4741                 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4742                 break;
4743         case SCTP_AUTH_ACTIVE_KEY:
4744                 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4745                 break;
4746         case SCTP_AUTH_DELETE_KEY:
4747                 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4748                 break;
4749         case SCTP_AUTH_DEACTIVATE_KEY:
4750                 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4751                 break;
4752         case SCTP_AUTO_ASCONF:
4753                 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4754                 break;
4755         case SCTP_PEER_ADDR_THLDS:
4756                 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4757                 break;
4758         case SCTP_RECVRCVINFO:
4759                 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4760                 break;
4761         case SCTP_RECVNXTINFO:
4762                 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4763                 break;
4764         case SCTP_PR_SUPPORTED:
4765                 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4766                 break;
4767         case SCTP_DEFAULT_PRINFO:
4768                 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4769                 break;
4770         case SCTP_RECONFIG_SUPPORTED:
4771                 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4772                 break;
4773         case SCTP_ENABLE_STREAM_RESET:
4774                 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4775                 break;
4776         case SCTP_RESET_STREAMS:
4777                 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4778                 break;
4779         case SCTP_RESET_ASSOC:
4780                 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4781                 break;
4782         case SCTP_ADD_STREAMS:
4783                 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4784                 break;
4785         case SCTP_STREAM_SCHEDULER:
4786                 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4787                 break;
4788         case SCTP_STREAM_SCHEDULER_VALUE:
4789                 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4790                 break;
4791         case SCTP_INTERLEAVING_SUPPORTED:
4792                 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4793                                                                 optlen);
4794                 break;
4795         case SCTP_REUSE_PORT:
4796                 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4797                 break;
4798         case SCTP_EVENT:
4799                 retval = sctp_setsockopt_event(sk, optval, optlen);
4800                 break;
4801         default:
4802                 retval = -ENOPROTOOPT;
4803                 break;
4804         }
4805 
4806         release_sock(sk);
4807 
4808 out_nounlock:
4809         return retval;
4810 }
4811 
4812 /* API 3.1.6 connect() - UDP Style Syntax
4813  *
4814  * An application may use the connect() call in the UDP model to initiate an
4815  * association without sending data.
4816  *
4817  * The syntax is:
4818  *
4819  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4820  *
4821  * sd: the socket descriptor to have a new association added to.
4822  *
4823  * nam: the address structure (either struct sockaddr_in or struct
4824  *    sockaddr_in6 defined in RFC2553 [7]).
4825  *
4826  * len: the size of the address.
4827  */
4828 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4829                         int addr_len, int flags)
4830 {
4831         struct sctp_af *af;
4832         int err = -EINVAL;
4833 
4834         lock_sock(sk);
4835         pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4836                  addr, addr_len);
4837 
4838         /* Validate addr_len before calling common connect/connectx routine. */
4839         af = sctp_get_af_specific(addr->sa_family);
4840         if (af && addr_len >= af->sockaddr_len)
4841                 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4842 
4843         release_sock(sk);
4844         return err;
4845 }
4846 
4847 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4848                       int addr_len, int flags)
4849 {
4850         if (addr_len < sizeof(uaddr->sa_family))
4851                 return -EINVAL;
4852 
4853         if (uaddr->sa_family == AF_UNSPEC)
4854                 return -EOPNOTSUPP;
4855 
4856         return sctp_connect(sock->sk, uaddr, addr_len, flags);
4857 }
4858 
4859 /* FIXME: Write comments. */
4860 static int sctp_disconnect(struct sock *sk, int flags)
4861 {
4862         return -EOPNOTSUPP; /* STUB */
4863 }
4864 
4865 /* 4.1.4 accept() - TCP Style Syntax
4866  *
4867  * Applications use accept() call to remove an established SCTP
4868  * association from the accept queue of the endpoint.  A new socket
4869  * descriptor will be returned from accept() to represent the newly
4870  * formed association.
4871  */
4872 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4873 {
4874         struct sctp_sock *sp;
4875         struct sctp_endpoint *ep;
4876         struct sock *newsk = NULL;
4877         struct sctp_association *asoc;
4878         long timeo;
4879         int error = 0;
4880 
4881         lock_sock(sk);
4882 
4883         sp = sctp_sk(sk);
4884         ep = sp->ep;
4885 
4886         if (!sctp_style(sk, TCP)) {
4887                 error = -EOPNOTSUPP;
4888                 goto out;
4889         }
4890 
4891         if (!sctp_sstate(sk, LISTENING)) {
4892                 error = -EINVAL;
4893                 goto out;
4894         }
4895 
4896         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4897 
4898         error = sctp_wait_for_accept(sk, timeo);
4899         if (error)
4900                 goto out;
4901 
4902         /* We treat the list of associations on the endpoint as the accept
4903          * queue and pick the first association on the list.
4904          */
4905         asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4906 
4907         newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4908         if (!newsk) {
4909                 error = -ENOMEM;
4910                 goto out;
4911         }
4912 
4913         /* Populate the fields of the newsk from the oldsk and migrate the
4914          * asoc to the newsk.
4915          */
4916         error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4917         if (error) {
4918                 sk_common_release(newsk);
4919                 newsk = NULL;
4920         }
4921 
4922 out:
4923         release_sock(sk);
4924         *err = error;
4925         return newsk;
4926 }
4927 
4928 /* The SCTP ioctl handler. */
4929 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4930 {
4931         int rc = -ENOTCONN;
4932 
4933         lock_sock(sk);
4934 
4935         /*
4936          * SEQPACKET-style sockets in LISTENING state are valid, for
4937          * SCTP, so only discard TCP-style sockets in LISTENING state.
4938          */
4939         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4940                 goto out;
4941 
4942         switch (cmd) {
4943         case SIOCINQ: {
4944                 struct sk_buff *skb;
4945                 unsigned int amount = 0;
4946 
4947                 skb = skb_peek(&sk->sk_receive_queue);
4948                 if (skb != NULL) {
4949                         /*
4950                          * We will only return the amount of this packet since
4951                          * that is all that will be read.
4952                          */
4953                         amount = skb->len;
4954                 }
4955                 rc = put_user(amount, (int __user *)arg);
4956                 break;
4957         }
4958         default:
4959                 rc = -ENOIOCTLCMD;
4960                 break;
4961         }
4962 out:
4963         release_sock(sk);
4964         return rc;
4965 }
4966 
4967 /* This is the function which gets called during socket creation to
4968  * initialized the SCTP-specific portion of the sock.
4969  * The sock structure should already be zero-filled memory.
4970  */
4971 static int sctp_init_sock(struct sock *sk)
4972 {
4973         struct net *net = sock_net(sk);
4974         struct sctp_sock *sp;
4975 
4976         pr_debug("%s: sk:%p\n", __func__, sk);
4977 
4978         sp = sctp_sk(sk);
4979 
4980         /* Initialize the SCTP per socket area.  */
4981         switch (sk->sk_type) {
4982         case SOCK_SEQPACKET:
4983                 sp->type = SCTP_SOCKET_UDP;
4984                 break;
4985         case SOCK_STREAM:
4986                 sp->type = SCTP_SOCKET_TCP;
4987                 break;
4988         default:
4989                 return -ESOCKTNOSUPPORT;
4990         }
4991 
4992         sk->sk_gso_type = SKB_GSO_SCTP;
4993 
4994         /* Initialize default send parameters. These parameters can be
4995          * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4996          */
4997         sp->default_stream = 0;
4998         sp->default_ppid = 0;
4999         sp->default_flags = 0;
5000         sp->default_context = 0;
5001         sp->default_timetolive = 0;
5002 
5003         sp->default_rcv_context = 0;
5004         sp->max_burst = net->sctp.max_burst;
5005 
5006         sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
5007 
5008         /* Initialize default setup parameters. These parameters
5009          * can be modified with the SCTP_INITMSG socket option or
5010          * overridden by the SCTP_INIT CMSG.
5011          */
5012         sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
5013         sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
5014         sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
5015         sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
5016 
5017         /* Initialize default RTO related parameters.  These parameters can
5018          * be modified for with the SCTP_RTOINFO socket option.
5019          */
5020         sp->rtoinfo.srto_initial = net->sctp.rto_initial;
5021         sp->rtoinfo.srto_max     = net->sctp.rto_max;
5022         sp->rtoinfo.srto_min     = net->sctp.rto_min;
5023 
5024         /* Initialize default association related parameters. These parameters
5025          * can be modified with the SCTP_ASSOCINFO socket option.
5026          */
5027         sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5028         sp->assocparams.sasoc_number_peer_destinations = 0;
5029         sp->assocparams.sasoc_peer_rwnd = 0;
5030         sp->assocparams.sasoc_local_rwnd = 0;
5031         sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5032 
5033         /* Initialize default event subscriptions. By default, all the
5034          * options are off.
5035          */
5036         sp->subscribe = 0;
5037 
5038         /* Default Peer Address Parameters.  These defaults can
5039          * be modified via SCTP_PEER_ADDR_PARAMS
5040          */
5041         sp->hbinterval  = net->sctp.hb_interval;
5042         sp->pathmaxrxt  = net->sctp.max_retrans_path;
5043         sp->pf_retrans  = net->sctp.pf_retrans;
5044         sp->pathmtu     = 0; /* allow default discovery */
5045         sp->sackdelay   = net->sctp.sack_timeout;
5046         sp->sackfreq    = 2;
5047         sp->param_flags = SPP_HB_ENABLE |
5048                           SPP_PMTUD_ENABLE |
5049                           SPP_SACKDELAY_ENABLE;
5050         sp->default_ss = SCTP_SS_DEFAULT;
5051 
5052         /* If enabled no SCTP message fragmentation will be performed.
5053          * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5054          */
5055         sp->disable_fragments = 0;
5056 
5057         /* Enable Nagle algorithm by default.  */
5058         sp->nodelay           = 0;
5059 
5060         sp->recvrcvinfo = 0;
5061         sp->recvnxtinfo = 0;
5062 
5063         /* Enable by default. */
5064         sp->v4mapped          = 1;
5065 
5066         /* Auto-close idle associations after the configured
5067          * number of seconds.  A value of 0 disables this
5068          * feature.  Configure through the SCTP_AUTOCLOSE socket option,
5069          * for UDP-style sockets only.
5070          */
5071         sp->autoclose         = 0;
5072 
5073         /* User specified fragmentation limit. */
5074         sp->user_frag         = 0;
5075 
5076         sp->adaptation_ind = 0;
5077 
5078         sp->pf = sctp_get_pf_specific(sk->sk_family);
5079 
5080         /* Control variables for partial data delivery. */
5081         atomic_set(&sp->pd_mode, 0);
5082         skb_queue_head_init(&sp->pd_lobby);
5083         sp->frag_interleave = 0;
5084 
5085         /* Create a per socket endpoint structure.  Even if we
5086          * change the data structure relationships, this may still
5087          * be useful for storing pre-connect address information.
5088          */
5089         sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5090         if (!sp->ep)
5091                 return -ENOMEM;
5092 
5093         sp->hmac = NULL;
5094 
5095         sk->sk_destruct = sctp_destruct_sock;
5096 
5097         SCTP_DBG_OBJCNT_INC(sock);
5098 
5099         local_bh_disable();
5100         sk_sockets_allocated_inc(sk);
5101         sock_prot_inuse_add(net, sk->sk_prot, 1);
5102 
5103         /* Nothing can fail after this block, otherwise
5104          * sctp_destroy_sock() will be called without addr_wq_lock held
5105          */
5106         if (net->sctp.default_auto_asconf) {
5107                 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
5108                 list_add_tail(&sp->auto_asconf_list,
5109                     &net->sctp.auto_asconf_splist);
5110                 sp->do_auto_asconf = 1;
5111                 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
5112         } else {
5113                 sp->do_auto_asconf = 0;
5114         }
5115 
5116         local_bh_enable();
5117 
5118         return 0;
5119 }
5120 
5121 /* Cleanup any SCTP per socket resources. Must be called with
5122  * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5123  */
5124 static void sctp_destroy_sock(struct sock *sk)
5125 {
5126         struct sctp_sock *sp;
5127 
5128         pr_debug("%s: sk:%p\n", __func__, sk);
5129 
5130         /* Release our hold on the endpoint. */
5131         sp = sctp_sk(sk);
5132         /* This could happen during socket init, thus we bail out
5133          * early, since the rest of the below is not setup either.
5134          */
5135         if (sp->ep == NULL)
5136                 return;
5137 
5138         if (sp->do_auto_asconf) {
5139                 sp->do_auto_asconf = 0;
5140                 list_del(&sp->auto_asconf_list);
5141         }
5142         sctp_endpoint_free(sp->ep);
5143         local_bh_disable();
5144         sk_sockets_allocated_dec(sk);
5145         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5146         local_bh_enable();
5147 }
5148 
5149 /* Triggered when there are no references on the socket anymore */
5150 static void sctp_destruct_sock(struct sock *sk)
5151 {
5152         struct sctp_sock *sp = sctp_sk(sk);
5153 
5154         /* Free up the HMAC transform. */
5155         crypto_free_shash(sp->hmac);
5156 
5157         inet_sock_destruct(sk);
5158 }
5159 
5160 /* API 4.1.7 shutdown() - TCP Style Syntax
5161  *     int shutdown(int socket, int how);
5162  *
5163  *     sd      - the socket descriptor of the association to be closed.
5164  *     how     - Specifies the type of shutdown.  The  values  are
5165  *               as follows:
5166  *               SHUT_RD
5167  *                     Disables further receive operations. No SCTP
5168  *                     protocol action is taken.
5169  *               SHUT_WR
5170  *                     Disables further send operations, and initiates
5171  *                     the SCTP shutdown sequence.
5172  *               SHUT_RDWR
5173  *                     Disables further send  and  receive  operations
5174  *                     and initiates the SCTP shutdown sequence.
5175  */
5176 static void sctp_shutdown(struct sock *sk, int how)
5177 {
5178         struct net *net = sock_net(sk);
5179         struct sctp_endpoint *ep;
5180 
5181         if (!sctp_style(sk, TCP))
5182                 return;
5183 
5184         ep = sctp_sk(sk)->ep;
5185         if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5186                 struct sctp_association *asoc;
5187 
5188                 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5189                 asoc = list_entry(ep->asocs.next,
5190                                   struct sctp_association, asocs);
5191                 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5192         }
5193 }
5194 
5195 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5196                        struct sctp_info *info)
5197 {
5198         struct sctp_transport *prim;
5199         struct list_head *pos;
5200         int mask;
5201 
5202         memset(info, 0, sizeof(*info));
5203         if (!asoc) {
5204                 struct sctp_sock *sp = sctp_sk(sk);
5205 
5206                 info->sctpi_s_autoclose = sp->autoclose;
5207                 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5208                 info->sctpi_s_pd_point = sp->pd_point;
5209                 info->sctpi_s_nodelay = sp->nodelay;
5210                 info->sctpi_s_disable_fragments = sp->disable_fragments;
5211                 info->sctpi_s_v4mapped = sp->v4mapped;
5212                 info->sctpi_s_frag_interleave = sp->frag_interleave;
5213                 info->sctpi_s_type = sp->type;
5214 
5215                 return 0;
5216         }
5217 
5218         info->sctpi_tag = asoc->c.my_vtag;
5219         info->sctpi_state = asoc->state;
5220         info->sctpi_rwnd = asoc->a_rwnd;
5221         info->sctpi_unackdata = asoc->unack_data;
5222         info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5223         info->sctpi_instrms = asoc->stream.incnt;
5224         info->sctpi_outstrms = asoc->stream.outcnt;
5225         list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5226                 info->sctpi_inqueue++;
5227         list_for_each(pos, &asoc->outqueue.out_chunk_list)
5228                 info->sctpi_outqueue++;
5229         info->sctpi_overall_error = asoc->overall_error_count;
5230         info->sctpi_max_burst = asoc->max_burst;
5231         info->sctpi_maxseg = asoc->frag_point;
5232         info->sctpi_peer_rwnd = asoc->peer.rwnd;
5233         info->sctpi_peer_tag = asoc->c.peer_vtag;
5234 
5235         mask = asoc->peer.ecn_capable << 1;
5236         mask = (mask | asoc->peer.ipv4_address) << 1;
5237         mask = (mask | asoc->peer.ipv6_address) << 1;
5238         mask = (mask | asoc->peer.hostname_address) << 1;
5239         mask = (mask | asoc->peer.asconf_capable) << 1;
5240         mask = (mask | asoc->peer.prsctp_capable) << 1;
5241         mask = (mask | asoc->peer.auth_capable);
5242         info->sctpi_peer_capable = mask;
5243         mask = asoc->peer.sack_needed << 1;
5244         mask = (mask | asoc->peer.sack_generation) << 1;
5245         mask = (mask | asoc->peer.zero_window_announced);
5246         info->sctpi_peer_sack = mask;
5247 
5248         info->sctpi_isacks = asoc->stats.isacks;
5249         info->sctpi_osacks = asoc->stats.osacks;
5250         info->sctpi_opackets = asoc->stats.opackets;
5251         info->sctpi_ipackets = asoc->stats.ipackets;
5252         info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5253         info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5254         info->sctpi_idupchunks = asoc->stats.idupchunks;
5255         info->sctpi_gapcnt = asoc->stats.gapcnt;
5256         info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5257         info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5258         info->sctpi_oodchunks = asoc->stats.oodchunks;
5259         info->sctpi_iodchunks = asoc->stats.iodchunks;
5260         info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5261         info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5262 
5263         prim = asoc->peer.primary_path;
5264         memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5265         info->sctpi_p_state = prim->state;
5266         info->sctpi_p_cwnd = prim->cwnd;
5267         info->sctpi_p_srtt = prim->srtt;
5268         info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5269         info->sctpi_p_hbinterval = prim->hbinterval;
5270         info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5271         info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5272         info->sctpi_p_ssthresh = prim->ssthresh;
5273         info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5274         info->sctpi_p_flight_size = prim->flight_size;
5275         info->sctpi_p_error = prim->error_count;
5276 
5277         return 0;
5278 }
5279 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5280 
5281 /* use callback to avoid exporting the core structure */
5282 void sctp_transport_walk_start(struct rhashtable_iter *iter)
5283 {
5284         rhltable_walk_enter(&sctp_transport_hashtable, iter);
5285 
5286         rhashtable_walk_start(iter);
5287 }
5288 
5289 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
5290 {
5291         rhashtable_walk_stop(iter);
5292         rhashtable_walk_exit(iter);
5293 }
5294 
5295 struct sctp_transport *sctp_transport_get_next(struct net *net,
5296                                                struct rhashtable_iter *iter)
5297 {
5298         struct sctp_transport *t;
5299 
5300         t = rhashtable_walk_next(iter);
5301         for (; t; t = rhashtable_walk_next(iter)) {
5302                 if (IS_ERR(t)) {
5303                         if (PTR_ERR(t) == -EAGAIN)
5304                                 continue;
5305                         break;
5306                 }
5307 
5308                 if (!sctp_transport_hold(t))
5309                         continue;
5310 
5311                 if (net_eq(sock_net(t->asoc->base.sk), net) &&
5312                     t->asoc->peer.primary_path == t)
5313                         break;
5314 
5315                 sctp_transport_put(t);
5316         }
5317 
5318         return t;
5319 }
5320 
5321 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5322                                               struct rhashtable_iter *iter,
5323                                               int pos)
5324 {
5325         struct sctp_transport *t;
5326 
5327         if (!pos)
5328                 return SEQ_START_TOKEN;
5329 
5330         while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5331                 if (!--pos)
5332                         break;
5333                 sctp_transport_put(t);
5334         }
5335 
5336         return t;
5337 }
5338 
5339 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5340                            void *p) {
5341         int err = 0;
5342         int hash = 0;
5343         struct sctp_ep_common *epb;
5344         struct sctp_hashbucket *head;
5345 
5346         for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5347              hash++, head++) {
5348                 read_lock_bh(&head->lock);
5349                 sctp_for_each_hentry(epb, &head->chain) {
5350                         err = cb(sctp_ep(epb), p);
5351                         if (err)
5352                                 break;
5353                 }
5354                 read_unlock_bh(&head->lock);
5355         }
5356 
5357         return err;
5358 }
5359 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5360 
5361 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5362                                   struct net *net,
5363                                   const union sctp_addr *laddr,
5364                                   const union sctp_addr *paddr, void *p)
5365 {
5366         struct sctp_transport *transport;
5367         int err;
5368 
5369         rcu_read_lock();
5370         transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5371         rcu_read_unlock();
5372         if (!transport)
5373                 return -ENOENT;
5374 
5375         err = cb(transport, p);
5376         sctp_transport_put(transport);
5377 
5378         return err;
5379 }
5380 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5381 
5382 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5383                             int (*cb_done)(struct sctp_transport *, void *),
5384                             struct net *net, int *pos, void *p) {
5385         struct rhashtable_iter hti;
5386         struct sctp_transport *tsp;
5387         int ret;
5388 
5389 again:
5390         ret = 0;
5391         sctp_transport_walk_start(&hti);
5392 
5393         tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5394         for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5395                 ret = cb(tsp, p);
5396                 if (ret)
5397                         break;
5398                 (*pos)++;
5399                 sctp_transport_put(tsp);
5400         }
5401         sctp_transport_walk_stop(&hti);
5402 
5403         if (ret) {
5404                 if (cb_done && !cb_done(tsp, p)) {
5405                         (*pos)++;
5406                         sctp_transport_put(tsp);
5407                         goto again;
5408                 }
5409                 sctp_transport_put(tsp);
5410         }
5411 
5412         return ret;
5413 }
5414 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5415 
5416 /* 7.2.1 Association Status (SCTP_STATUS)
5417 
5418  * Applications can retrieve current status information about an
5419  * association, including association state, peer receiver window size,
5420  * number of unacked data chunks, and number of data chunks pending
5421  * receipt.  This information is read-only.
5422  */
5423 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5424                                        char __user *optval,
5425                                        int __user *optlen)
5426 {
5427         struct sctp_status status;
5428         struct sctp_association *asoc = NULL;
5429         struct sctp_transport *transport;
5430         sctp_assoc_t associd;
5431         int retval = 0;
5432 
5433         if (len < sizeof(status)) {
5434                 retval = -EINVAL;
5435                 goto out;
5436         }
5437 
5438         len = sizeof(status);
5439         if (copy_from_user(&status, optval, len)) {
5440                 retval = -EFAULT;
5441                 goto out;
5442         }
5443 
5444         associd = status.sstat_assoc_id;
5445         asoc = sctp_id2assoc(sk, associd);
5446         if (!asoc) {
5447                 retval = -EINVAL;
5448                 goto out;
5449         }
5450 
5451         transport = asoc->peer.primary_path;
5452 
5453         status.sstat_assoc_id = sctp_assoc2id(asoc);
5454         status.sstat_state = sctp_assoc_to_state(asoc);
5455         status.sstat_rwnd =  asoc->peer.rwnd;
5456         status.sstat_unackdata = asoc->unack_data;
5457 
5458         status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5459         status.sstat_instrms = asoc->stream.incnt;
5460         status.sstat_outstrms = asoc->stream.outcnt;
5461         status.sstat_fragmentation_point = asoc->frag_point;
5462         status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5463         memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5464                         transport->af_specific->sockaddr_len);
5465         /* Map ipv4 address into v4-mapped-on-v6 address.  */
5466         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5467                 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5468         status.sstat_primary.spinfo_state = transport->state;
5469         status.sstat_primary.spinfo_cwnd = transport->cwnd;
5470         status.sstat_primary.spinfo_srtt = transport->srtt;
5471         status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5472         status.sstat_primary.spinfo_mtu = transport->pathmtu;
5473 
5474         if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5475                 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5476 
5477         if (put_user(len, optlen)) {
5478                 retval = -EFAULT;
5479                 goto out;
5480         }
5481 
5482         pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5483                  __func__, len, status.sstat_state, status.sstat_rwnd,
5484                  status.sstat_assoc_id);
5485 
5486         if (copy_to_user(optval, &status, len)) {
5487                 retval = -EFAULT;
5488                 goto out;
5489         }
5490 
5491 out:
5492         return retval;
5493 }
5494 
5495 
5496 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5497  *
5498  * Applications can retrieve information about a specific peer address
5499  * of an association, including its reachability state, congestion
5500  * window, and retransmission timer values.  This information is
5501  * read-only.
5502  */
5503 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5504                                           char __user *optval,
5505                                           int __user *optlen)
5506 {
5507         struct sctp_paddrinfo pinfo;
5508         struct sctp_transport *transport;
5509         int retval = 0;
5510 
5511         if (len < sizeof(pinfo)) {
5512                 retval = -EINVAL;
5513                 goto out;
5514         }
5515 
5516         len = sizeof(pinfo);
5517         if (copy_from_user(&pinfo, optval, len)) {
5518                 retval = -EFAULT;
5519                 goto out;
5520         }
5521 
5522         transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5523                                            pinfo.spinfo_assoc_id);
5524         if (!transport)
5525                 return -EINVAL;
5526 
5527         pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5528         pinfo.spinfo_state = transport->state;
5529         pinfo.spinfo_cwnd = transport->cwnd;
5530         pinfo.spinfo_srtt = transport->srtt;
5531         pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5532         pinfo.spinfo_mtu = transport->pathmtu;
5533 
5534         if (pinfo.spinfo_state == SCTP_UNKNOWN)
5535                 pinfo.spinfo_state = SCTP_ACTIVE;
5536 
5537         if (put_user(len, optlen)) {
5538                 retval = -EFAULT;
5539                 goto out;
5540         }
5541 
5542         if (copy_to_user(optval, &pinfo, len)) {
5543                 retval = -EFAULT;
5544                 goto out;
5545         }
5546 
5547 out:
5548         return retval;
5549 }
5550 
5551 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5552  *
5553  * This option is a on/off flag.  If enabled no SCTP message
5554  * fragmentation will be performed.  Instead if a message being sent
5555  * exceeds the current PMTU size, the message will NOT be sent and
5556  * instead a error will be indicated to the user.
5557  */
5558 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5559                                         char __user *optval, int __user *optlen)
5560 {
5561         int val;
5562 
5563         if (len < sizeof(int))
5564                 return -EINVAL;
5565 
5566         len = sizeof(int);
5567         val = (sctp_sk(sk)->disable_fragments == 1);
5568         if (put_user(len, optlen))
5569                 return -EFAULT;
5570         if (copy_to_user(optval, &val, len))
5571                 return -EFAULT;
5572         return 0;
5573 }
5574 
5575 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5576  *
5577  * This socket option is used to specify various notifications and
5578  * ancillary data the user wishes to receive.
5579  */
5580 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5581                                   int __user *optlen)
5582 {
5583         struct sctp_event_subscribe subscribe;
5584         __u8 *sn_type = (__u8 *)&subscribe;
5585         int i;
5586 
5587         if (len == 0)
5588                 return -EINVAL;
5589         if (len > sizeof(struct sctp_event_subscribe))
5590                 len = sizeof(struct sctp_event_subscribe);
5591         if (put_user(len, optlen))
5592                 return -EFAULT;
5593 
5594         for (i = 0; i < len; i++)
5595                 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5596                                                         SCTP_SN_TYPE_BASE + i);
5597 
5598         if (copy_to_user(optval, &subscribe, len))
5599                 return -EFAULT;
5600 
5601         return 0;
5602 }
5603 
5604 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5605  *
5606  * This socket option is applicable to the UDP-style socket only.  When
5607  * set it will cause associations that are idle for more than the
5608  * specified number of seconds to automatically close.  An association
5609  * being idle is defined an association that has NOT sent or received
5610  * user data.  The special value of '' indicates that no automatic
5611  * close of any associations should be performed.  The option expects an
5612  * integer defining the number of seconds of idle time before an
5613  * association is closed.
5614  */
5615 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5616 {
5617         /* Applicable to UDP-style socket only */
5618         if (sctp_style(sk, TCP))
5619                 return -EOPNOTSUPP;
5620         if (len < sizeof(int))
5621                 return -EINVAL;
5622         len = sizeof(int);
5623         if (put_user(len, optlen))
5624                 return -EFAULT;
5625         if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5626                 return -EFAULT;
5627         return 0;
5628 }
5629 
5630 /* Helper routine to branch off an association to a new socket.  */
5631 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5632 {
5633         struct sctp_association *asoc = sctp_id2assoc(sk, id);
5634         struct sctp_sock *sp = sctp_sk(sk);
5635         struct socket *sock;
5636         int err = 0;
5637 
5638         /* Do not peel off from one netns to another one. */
5639         if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5640                 return -EINVAL;
5641 
5642         if (!asoc)
5643                 return -EINVAL;
5644 
5645         /* An association cannot be branched off from an already peeled-off
5646          * socket, nor is this supported for tcp style sockets.
5647          */
5648         if (!sctp_style(sk, UDP))
5649                 return -EINVAL;
5650 
5651         /* Create a new socket.  */
5652         err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5653         if (err < 0)
5654                 return err;
5655 
5656         sctp_copy_sock(sock->sk, sk, asoc);
5657 
5658         /* Make peeled-off sockets more like 1-1 accepted sockets.
5659          * Set the daddr and initialize id to something more random and also
5660          * copy over any ip options.
5661          */
5662         sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5663         sp->pf->copy_ip_options(sk, sock->sk);
5664 
5665         /* Populate the fields of the newsk from the oldsk and migrate the
5666          * asoc to the newsk.
5667          */
5668         err = sctp_sock_migrate(sk, sock->sk, asoc,
5669                                 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5670         if (err) {
5671                 sock_release(sock);
5672                 sock = NULL;
5673         }
5674 
5675         *sockp = sock;
5676 
5677         return err;
5678 }
5679 EXPORT_SYMBOL(sctp_do_peeloff);
5680 
5681 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5682                                           struct file **newfile, unsigned flags)
5683 {
5684         struct socket *newsock;
5685         int retval;
5686 
5687         retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5688         if (retval < 0)
5689                 goto out;
5690 
5691         /* Map the socket to an unused fd that can be returned to the user.  */
5692         retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5693         if (retval < 0) {
5694                 sock_release(newsock);
5695                 goto out;
5696         }
5697 
5698         *newfile = sock_alloc_file(newsock, 0, NULL);
5699         if (IS_ERR(*newfile)) {
5700                 put_unused_fd(retval);
5701                 retval = PTR_ERR(*newfile);
5702                 *newfile = NULL;
5703                 return retval;
5704         }
5705 
5706         pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5707                  retval);
5708 
5709         peeloff->sd = retval;
5710 
5711         if (flags & SOCK_NONBLOCK)
5712                 (*newfile)->f_flags |= O_NONBLOCK;
5713 out:
5714         return retval;
5715 }
5716 
5717 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5718 {
5719         sctp_peeloff_arg_t peeloff;
5720         struct file *newfile = NULL;
5721         int retval = 0;
5722 
5723         if (len < sizeof(sctp_peeloff_arg_t))
5724                 return -EINVAL;
5725         len = sizeof(sctp_peeloff_arg_t);
5726         if (copy_from_user(&peeloff, optval, len))
5727                 return -EFAULT;
5728 
5729         retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5730         if (retval < 0)
5731                 goto out;
5732 
5733         /* Return the fd mapped to the new socket.  */
5734         if (put_user(len, optlen)) {
5735                 fput(newfile);
5736                 put_unused_fd(retval);
5737                 return -EFAULT;
5738         }
5739 
5740         if (copy_to_user(optval, &peeloff, len)) {
5741                 fput(newfile);
5742                 put_unused_fd(retval);
5743                 return -EFAULT;
5744         }
5745         fd_install(retval, newfile);
5746 out:
5747         return retval;
5748 }
5749 
5750 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5751                                          char __user *optval, int __user *optlen)
5752 {
5753         sctp_peeloff_flags_arg_t peeloff;
5754         struct file *newfile = NULL;
5755         int retval = 0;
5756 
5757         if (len < sizeof(sctp_peeloff_flags_arg_t))
5758                 return -EINVAL;
5759         len = sizeof(sctp_peeloff_flags_arg_t);
5760         if (copy_from_user(&peeloff, optval, len))
5761                 return -EFAULT;
5762 
5763         retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5764                                                 &newfile, peeloff.flags);
5765         if (retval < 0)
5766                 goto out;
5767 
5768         /* Return the fd mapped to the new socket.  */
5769         if (put_user(len, optlen)) {
5770                 fput(newfile);
5771                 put_unused_fd(retval);
5772                 return -EFAULT;
5773         }
5774 
5775         if (copy_to_user(optval, &peeloff, len)) {
5776                 fput(newfile);
5777                 put_unused_fd(retval);
5778                 return -EFAULT;
5779         }
5780         fd_install(retval, newfile);
5781 out:
5782         return retval;
5783 }
5784 
5785 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5786  *
5787  * Applications can enable or disable heartbeats for any peer address of
5788  * an association, modify an address's heartbeat interval, force a
5789  * heartbeat to be sent immediately, and adjust the address's maximum
5790  * number of retransmissions sent before an address is considered
5791  * unreachable.  The following structure is used to access and modify an
5792  * address's parameters:
5793  *
5794  *  struct sctp_paddrparams {
5795  *     sctp_assoc_t            spp_assoc_id;
5796  *     struct sockaddr_storage spp_address;
5797  *     uint32_t                spp_hbinterval;
5798  *     uint16_t                spp_pathmaxrxt;
5799  *     uint32_t                spp_pathmtu;
5800  *     uint32_t                spp_sackdelay;
5801  *     uint32_t                spp_flags;
5802  * };
5803  *
5804  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
5805  *                     application, and identifies the association for
5806  *                     this query.
5807  *   spp_address     - This specifies which address is of interest.
5808  *   spp_hbinterval  - This contains the value of the heartbeat interval,
5809  *                     in milliseconds.  If a  value of zero
5810  *                     is present in this field then no changes are to
5811  *                     be made to this parameter.
5812  *   spp_pathmaxrxt  - This contains the maximum number of
5813  *                     retransmissions before this address shall be
5814  *                     considered unreachable. If a  value of zero
5815  *                     is present in this field then no changes are to
5816  *                     be made to this parameter.
5817  *   spp_pathmtu     - When Path MTU discovery is disabled the value
5818  *                     specified here will be the "fixed" path mtu.
5819  *                     Note that if the spp_address field is empty
5820  *                     then all associations on this address will
5821  *                     have this fixed path mtu set upon them.
5822  *
5823  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
5824  *                     the number of milliseconds that sacks will be delayed
5825  *                     for. This value will apply to all addresses of an
5826  *                     association if the spp_address field is empty. Note
5827  *                     also, that if delayed sack is enabled and this
5828  *                     value is set to 0, no change is made to the last
5829  *                     recorded delayed sack timer value.
5830  *
5831  *   spp_flags       - These flags are used to control various features
5832  *                     on an association. The flag field may contain
5833  *                     zero or more of the following options.
5834  *
5835  *                     SPP_HB_ENABLE  - Enable heartbeats on the
5836  *                     specified address. Note that if the address
5837  *                     field is empty all addresses for the association
5838  *                     have heartbeats enabled upon them.
5839  *
5840  *                     SPP_HB_DISABLE - Disable heartbeats on the
5841  *                     speicifed address. Note that if the address
5842  *                     field is empty all addresses for the association
5843  *                     will have their heartbeats disabled. Note also
5844  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
5845  *                     mutually exclusive, only one of these two should
5846  *                     be specified. Enabling both fields will have
5847  *                     undetermined results.
5848  *
5849  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
5850  *                     to be made immediately.
5851  *
5852  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
5853  *                     discovery upon the specified address. Note that
5854  *                     if the address feild is empty then all addresses
5855  *                     on the association are effected.
5856  *
5857  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
5858  *                     discovery upon the specified address. Note that
5859  *                     if the address feild is empty then all addresses
5860  *                     on the association are effected. Not also that
5861  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5862  *                     exclusive. Enabling both will have undetermined
5863  *                     results.
5864  *
5865  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
5866  *                     on delayed sack. The time specified in spp_sackdelay
5867  *                     is used to specify the sack delay for this address. Note
5868  *                     that if spp_address is empty then all addresses will
5869  *                     enable delayed sack and take on the sack delay
5870  *                     value specified in spp_sackdelay.
5871  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
5872  *                     off delayed sack. If the spp_address field is blank then
5873  *                     delayed sack is disabled for the entire association. Note
5874  *                     also that this field is mutually exclusive to
5875  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
5876  *                     results.
5877  *
5878  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
5879  *                     setting of the IPV6 flow label value.  The value is
5880  *                     contained in the spp_ipv6_flowlabel field.
5881  *                     Upon retrieval, this flag will be set to indicate that
5882  *                     the spp_ipv6_flowlabel field has a valid value returned.
5883  *                     If a specific destination address is set (in the
5884  *                     spp_address field), then the value returned is that of
5885  *                     the address.  If just an association is specified (and
5886  *                     no address), then the association's default flow label
5887  *                     is returned.  If neither an association nor a destination
5888  *                     is specified, then the socket's default flow label is
5889  *                     returned.  For non-IPv6 sockets, this flag will be left
5890  *                     cleared.
5891  *
5892  *                     SPP_DSCP:  Setting this flag enables the setting of the
5893  *                     Differentiated Services Code Point (DSCP) value
5894  *                     associated with either the association or a specific
5895  *                     address.  The value is obtained in the spp_dscp field.
5896  *                     Upon retrieval, this flag will be set to indicate that
5897  *                     the spp_dscp field has a valid value returned.  If a
5898  *                     specific destination address is set when called (in the
5899  *                     spp_address field), then that specific destination
5900  *                     address's DSCP value is returned.  If just an association
5901  *                     is specified, then the association's default DSCP is
5902  *                     returned.  If neither an association nor a destination is
5903  *                     specified, then the socket's default DSCP is returned.
5904  *
5905  *   spp_ipv6_flowlabel
5906  *                   - This field is used in conjunction with the
5907  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5908  *                     The 20 least significant bits are used for the flow
5909  *                     label.  This setting has precedence over any IPv6-layer
5910  *                     setting.
5911  *
5912  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
5913  *                     and contains the DSCP.  The 6 most significant bits are
5914  *                     used for the DSCP.  This setting has precedence over any
5915  *                     IPv4- or IPv6- layer setting.
5916  */
5917 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5918                                             char __user *optval, int __user *optlen)
5919 {
5920         struct sctp_paddrparams  params;
5921         struct sctp_transport   *trans = NULL;
5922         struct sctp_association *asoc = NULL;
5923         struct sctp_sock        *sp = sctp_sk(sk);
5924 
5925         if (len >= sizeof(params))
5926                 len = sizeof(params);
5927         else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5928                                        spp_ipv6_flowlabel), 4))
5929                 len = ALIGN(offsetof(struct sctp_paddrparams,
5930                                      spp_ipv6_flowlabel), 4);
5931         else
5932                 return -EINVAL;
5933 
5934         if (copy_from_user(&params, optval, len))
5935                 return -EFAULT;
5936 
5937         /* If an address other than INADDR_ANY is specified, and
5938          * no transport is found, then the request is invalid.
5939          */
5940         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5941                 trans = sctp_addr_id2transport(sk, &params.spp_address,
5942                                                params.spp_assoc_id);
5943                 if (!trans) {
5944                         pr_debug("%s: failed no transport\n", __func__);
5945                         return -EINVAL;
5946                 }
5947         }
5948 
5949         /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5950          * socket is a one to many style socket, and an association
5951          * was not found, then the id was invalid.
5952          */
5953         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5954         if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5955             sctp_style(sk, UDP)) {
5956                 pr_debug("%s: failed no association\n", __func__);
5957                 return -EINVAL;
5958         }
5959 
5960         if (trans) {
5961                 /* Fetch transport values. */
5962                 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5963                 params.spp_pathmtu    = trans->pathmtu;
5964                 params.spp_pathmaxrxt = trans->pathmaxrxt;
5965                 params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
5966 
5967                 /*draft-11 doesn't say what to return in spp_flags*/
5968                 params.spp_flags      = trans->param_flags;
5969                 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5970                         params.spp_ipv6_flowlabel = trans->flowlabel &
5971                                                     SCTP_FLOWLABEL_VAL_MASK;
5972                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
5973                 }
5974                 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5975                         params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5976                         params.spp_flags |= SPP_DSCP;
5977                 }
5978         } else if (asoc) {
5979                 /* Fetch association values. */
5980                 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5981                 params.spp_pathmtu    = asoc->pathmtu;
5982                 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5983                 params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
5984 
5985                 /*draft-11 doesn't say what to return in spp_flags*/
5986                 params.spp_flags      = asoc->param_flags;
5987                 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5988                         params.spp_ipv6_flowlabel = asoc->flowlabel &
5989                                                     SCTP_FLOWLABEL_VAL_MASK;
5990                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
5991                 }
5992                 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5993                         params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5994                         params.spp_flags |= SPP_DSCP;
5995                 }
5996         } else {
5997                 /* Fetch socket values. */
5998                 params.spp_hbinterval = sp->hbinterval;
5999                 params.spp_pathmtu    = sp->pathmtu;
6000                 params.spp_sackdelay  = sp->sackdelay;
6001                 params.spp_pathmaxrxt = sp->pathmaxrxt;
6002 
6003                 /*draft-11 doesn't say what to return in spp_flags*/
6004                 params.spp_flags      = sp->param_flags;
6005                 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
6006                         params.spp_ipv6_flowlabel = sp->flowlabel &
6007                                                     SCTP_FLOWLABEL_VAL_MASK;
6008                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
6009                 }
6010                 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6011                         params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6012                         params.spp_flags |= SPP_DSCP;
6013                 }
6014         }
6015 
6016         if (copy_to_user(optval, &params, len))
6017                 return -EFAULT;
6018 
6019         if (put_user(len, optlen))
6020                 return -EFAULT;
6021 
6022         return 0;
6023 }
6024 
6025 /*
6026  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
6027  *
6028  * This option will effect the way delayed acks are performed.  This
6029  * option allows you to get or set the delayed ack time, in
6030  * milliseconds.  It also allows changing the delayed ack frequency.
6031  * Changing the frequency to 1 disables the delayed sack algorithm.  If
6032  * the assoc_id is 0, then this sets or gets the endpoints default
6033  * values.  If the assoc_id field is non-zero, then the set or get
6034  * effects the specified association for the one to many model (the
6035  * assoc_id field is ignored by the one to one model).  Note that if
6036  * sack_delay or sack_freq are 0 when setting this option, then the
6037  * current values will remain unchanged.
6038  *
6039  * struct sctp_sack_info {
6040  *     sctp_assoc_t            sack_assoc_id;
6041  *     uint32_t                sack_delay;
6042  *     uint32_t                sack_freq;
6043  * };
6044  *
6045  * sack_assoc_id -  This parameter, indicates which association the user
6046  *    is performing an action upon.  Note that if this field's value is
6047  *    zero then the endpoints default value is changed (effecting future
6048  *    associations only).
6049  *
6050  * sack_delay -  This parameter contains the number of milliseconds that
6051  *    the user is requesting the delayed ACK timer be set to.  Note that
6052  *    this value is defined in the standard to be between 200 and 500
6053  *    milliseconds.
6054  *
6055  * sack_freq -  This parameter contains the number of packets that must
6056  *    be received before a sack is sent without waiting for the delay
6057  *    timer to expire.  The default value for this is 2, setting this
6058  *    value to 1 will disable the delayed sack algorithm.
6059  */
6060 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6061                                             char __user *optval,
6062                                             int __user *optlen)
6063 {
6064         struct sctp_sack_info    params;
6065         struct sctp_association *asoc = NULL;
6066         struct sctp_sock        *sp = sctp_sk(sk);
6067 
6068         if (len >= sizeof(struct sctp_sack_info)) {
6069                 len = sizeof(struct sctp_sack_info);
6070 
6071                 if (copy_from_user(&params, optval, len))
6072                         return -EFAULT;
6073         } else if (len == sizeof(struct sctp_assoc_value)) {
6074                 pr_warn_ratelimited(DEPRECATED
6075                                     "%s (pid %d) "
6076                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6077                                     "Use struct sctp_sack_info instead\n",
6078                                     current->comm, task_pid_nr(current));
6079                 if (copy_from_user(&params, optval, len))
6080                         return -EFAULT;
6081         } else
6082                 return -EINVAL;
6083 
6084         /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6085          * socket is a one to many style socket, and an association
6086          * was not found, then the id was invalid.
6087          */
6088         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6089         if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6090             sctp_style(sk, UDP))
6091                 return -EINVAL;
6092 
6093         if (asoc) {
6094                 /* Fetch association values. */
6095                 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6096                         params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6097                         params.sack_freq = asoc->sackfreq;
6098 
6099                 } else {
6100                         params.sack_delay = 0;
6101                         params.sack_freq = 1;
6102                 }
6103         } else {
6104                 /* Fetch socket values. */
6105                 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6106                         params.sack_delay  = sp->sackdelay;
6107                         params.sack_freq = sp->sackfreq;
6108                 } else {
6109                         params.sack_delay  = 0;
6110                         params.sack_freq = 1;
6111                 }
6112         }
6113 
6114         if (copy_to_user(optval, &params, len))
6115                 return -EFAULT;
6116 
6117         if (put_user(len, optlen))
6118                 return -EFAULT;
6119 
6120         return 0;
6121 }
6122 
6123 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6124  *
6125  * Applications can specify protocol parameters for the default association
6126  * initialization.  The option name argument to setsockopt() and getsockopt()
6127  * is SCTP_INITMSG.
6128  *
6129  * Setting initialization parameters is effective only on an unconnected
6130  * socket (for UDP-style sockets only future associations are effected
6131  * by the change).  With TCP-style sockets, this option is inherited by
6132  * sockets derived from a listener socket.
6133  */
6134 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6135 {
6136         if (len < sizeof(struct sctp_initmsg))
6137                 return -EINVAL;
6138         len = sizeof(struct sctp_initmsg);
6139         if (put_user(len, optlen))
6140                 return -EFAULT;
6141         if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6142                 return -EFAULT;
6143         return 0;
6144 }
6145 
6146 
6147 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6148                                       char __user *optval, int __user *optlen)
6149 {
6150         struct sctp_association *asoc;
6151         int cnt = 0;
6152         struct sctp_getaddrs getaddrs;
6153         struct sctp_transport *from;
6154         void __user *to;
6155         union sctp_addr temp;
6156         struct sctp_sock *sp = sctp_sk(sk);
6157         int addrlen;
6158         size_t space_left;
6159         int bytes_copied;
6160 
6161         if (len < sizeof(struct sctp_getaddrs))
6162                 return -EINVAL;
6163 
6164         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6165                 return -EFAULT;
6166 
6167         /* For UDP-style sockets, id specifies the association to query.  */
6168         asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6169         if (!asoc)
6170                 return -EINVAL;
6171 
6172         to = optval + offsetof(struct sctp_getaddrs, addrs);
6173         space_left = len - offsetof(struct sctp_getaddrs, addrs);
6174 
6175         list_for_each_entry(from, &asoc->peer.transport_addr_list,
6176                                 transports) {
6177                 memcpy(&temp, &from->ipaddr, sizeof(temp));
6178                 addrlen = sctp_get_pf_specific(sk->sk_family)
6179                               ->addr_to_user(sp, &temp);
6180                 if (space_left < addrlen)
6181                         return -ENOMEM;
6182                 if (copy_to_user(to, &temp, addrlen))
6183                         return -EFAULT;
6184                 to += addrlen;
6185                 cnt++;
6186                 space_left -= addrlen;
6187         }
6188 
6189         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6190                 return -EFAULT;
6191         bytes_copied = ((char __user *)to) - optval;
6192         if (put_user(bytes_copied, optlen))
6193                 return -EFAULT;
6194 
6195         return 0;
6196 }
6197 
6198 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6199                             size_t space_left, int *bytes_copied)
6200 {
6201         struct sctp_sockaddr_entry *addr;
6202         union sctp_addr temp;
6203         int cnt = 0;
6204         int addrlen;
6205         struct net *net = sock_net(sk);
6206 
6207         rcu_read_lock();
6208         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6209                 if (!addr->valid)
6210                         continue;
6211 
6212                 if ((PF_INET == sk->sk_family) &&
6213                     (AF_INET6 == addr->a.sa.sa_family))
6214                         continue;
6215                 if ((PF_INET6 == sk->sk_family) &&
6216                     inet_v6_ipv6only(sk) &&
6217                     (AF_INET == addr->a.sa.sa_family))
6218                         continue;
6219                 memcpy(&temp, &addr->a, sizeof(temp));
6220                 if (!temp.v4.sin_port)
6221                         temp.v4.sin_port = htons(port);
6222 
6223                 addrlen = sctp_get_pf_specific(sk->sk_family)
6224                               ->addr_to_user(sctp_sk(sk), &temp);
6225 
6226                 if (space_left < addrlen) {
6227                         cnt =  -ENOMEM;
6228                         break;
6229                 }
6230                 memcpy(to, &temp, addrlen);
6231 
6232                 to += addrlen;
6233                 cnt++;
6234                 space_left -= addrlen;
6235                 *bytes_copied += addrlen;
6236         }
6237         rcu_read_unlock();
6238 
6239         return cnt;
6240 }
6241 
6242 
6243 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6244                                        char __user *optval, int __user *optlen)
6245 {
6246         struct sctp_bind_addr *bp;
6247         struct sctp_association *asoc;
6248         int cnt = 0;
6249         struct sctp_getaddrs getaddrs;
6250         struct sctp_sockaddr_entry *addr;
6251         void __user *to;
6252         union sctp_addr temp;
6253         struct sctp_sock *sp = sctp_sk(sk);
6254         int addrlen;
6255         int err = 0;
6256         size_t space_left;
6257         int bytes_copied = 0;
6258         void *addrs;
6259         void *buf;
6260 
6261         if (len < sizeof(struct sctp_getaddrs))
6262                 return -EINVAL;
6263 
6264         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6265                 return -EFAULT;
6266 
6267         /*
6268          *  For UDP-style sockets, id specifies the association to query.
6269          *  If the id field is set to the value '' then the locally bound
6270          *  addresses are returned without regard to any particular
6271          *  association.
6272          */
6273         if (0 == getaddrs.assoc_id) {
6274                 bp = &sctp_sk(sk)->ep->base.bind_addr;
6275         } else {
6276                 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6277                 if (!asoc)
6278                         return -EINVAL;
6279                 bp = &asoc->base.bind_addr;
6280         }
6281 
6282         to = optval + offsetof(struct sctp_getaddrs, addrs);
6283         space_left = len - offsetof(struct sctp_getaddrs, addrs);
6284 
6285         addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6286         if (!addrs)
6287                 return -ENOMEM;
6288 
6289         /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6290          * addresses from the global local address list.
6291          */
6292         if (sctp_list_single_entry(&bp->address_list)) {
6293                 addr = list_entry(bp->address_list.next,
6294                                   struct sctp_sockaddr_entry, list);
6295                 if (sctp_is_any(sk, &addr->a)) {
6296                         cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6297                                                 space_left, &bytes_copied);
6298                         if (cnt < 0) {
6299                                 err = cnt;
6300                                 goto out;
6301                         }
6302                         goto copy_getaddrs;
6303                 }
6304         }
6305 
6306         buf = addrs;
6307         /* Protection on the bound address list is not needed since
6308          * in the socket option context we hold a socket lock and
6309          * thus the bound address list can't change.
6310          */
6311         list_for_each_entry(addr, &bp->address_list, list) {
6312                 memcpy(&temp, &addr->a, sizeof(temp));
6313                 addrlen = sctp_get_pf_specific(sk->sk_family)
6314                               ->addr_to_user(sp, &temp);
6315                 if (space_left < addrlen) {
6316                         err =  -ENOMEM; /*fixme: right error?*/
6317                         goto out;
6318                 }
6319                 memcpy(buf, &temp, addrlen);
6320                 buf += addrlen;
6321                 bytes_copied += addrlen;
6322                 cnt++;
6323                 space_left -= addrlen;
6324         }
6325 
6326 copy_getaddrs:
6327         if (copy_to_user(to, addrs, bytes_copied)) {
6328                 err = -EFAULT;
6329                 goto out;
6330         }
6331         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6332                 err = -EFAULT;
6333                 goto out;
6334         }
6335         /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6336          * but we can't change it anymore.
6337          */
6338         if (put_user(bytes_copied, optlen))
6339                 err = -EFAULT;
6340 out:
6341         kfree(addrs);
6342         return err;
6343 }
6344 
6345 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6346  *
6347  * Requests that the local SCTP stack use the enclosed peer address as
6348  * the association primary.  The enclosed address must be one of the
6349  * association peer's addresses.
6350  */
6351 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6352                                         char __user *optval, int __user *optlen)
6353 {
6354         struct sctp_prim prim;
6355         struct sctp_association *asoc;
6356         struct sctp_sock *sp = sctp_sk(sk);
6357 
6358         if (len < sizeof(struct sctp_prim))
6359                 return -EINVAL;
6360 
6361         len = sizeof(struct sctp_prim);
6362 
6363         if (copy_from_user(&prim, optval, len))
6364                 return -EFAULT;
6365 
6366         asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6367         if (!asoc)
6368                 return -EINVAL;
6369 
6370         if (!asoc->peer.primary_path)
6371                 return -ENOTCONN;
6372 
6373         memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6374                 asoc->peer.primary_path->af_specific->sockaddr_len);
6375 
6376         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6377                         (union sctp_addr *)&prim.ssp_addr);
6378 
6379         if (put_user(len, optlen))
6380                 return -EFAULT;
6381         if (copy_to_user(optval, &prim, len))
6382                 return -EFAULT;
6383 
6384         return 0;
6385 }
6386 
6387 /*
6388  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6389  *
6390  * Requests that the local endpoint set the specified Adaptation Layer
6391  * Indication parameter for all future INIT and INIT-ACK exchanges.
6392  */
6393 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6394                                   char __user *optval, int __user *optlen)
6395 {
6396         struct sctp_setadaptation adaptation;
6397 
6398         if (len < sizeof(struct sctp_setadaptation))
6399                 return -EINVAL;
6400 
6401         len = sizeof(struct sctp_setadaptation);
6402 
6403         adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6404 
6405         if (put_user(len, optlen))
6406                 return -EFAULT;
6407         if (copy_to_user(optval, &adaptation, len))
6408                 return -EFAULT;
6409 
6410         return 0;
6411 }
6412 
6413 /*
6414  *
6415  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6416  *
6417  *   Applications that wish to use the sendto() system call may wish to
6418  *   specify a default set of parameters that would normally be supplied
6419  *   through the inclusion of ancillary data.  This socket option allows
6420  *   such an application to set the default sctp_sndrcvinfo structure.
6421 
6422 
6423  *   The application that wishes to use this socket option simply passes
6424  *   in to this call the sctp_sndrcvinfo structure defined in Section
6425  *   5.2.2) The input parameters accepted by this call include
6426  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6427  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
6428  *   to this call if the caller is using the UDP model.
6429  *
6430  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
6431  */
6432 static int sctp_getsockopt_default_send_param(struct sock *sk,
6433                                         int