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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 <linux/types.h>
 56 #include <linux/kernel.h>
 57 #include <linux/wait.h>
 58 #include <linux/time.h>
 59 #include <linux/ip.h>
 60 #include <linux/capability.h>
 61 #include <linux/fcntl.h>
 62 #include <linux/poll.h>
 63 #include <linux/init.h>
 64 #include <linux/crypto.h>
 65 #include <linux/slab.h>
 66 #include <linux/file.h>
 67 #include <linux/compat.h>
 68 
 69 #include <net/ip.h>
 70 #include <net/icmp.h>
 71 #include <net/route.h>
 72 #include <net/ipv6.h>
 73 #include <net/inet_common.h>
 74 #include <net/busy_poll.h>
 75 
 76 #include <linux/socket.h> /* for sa_family_t */
 77 #include <linux/export.h>
 78 #include <net/sock.h>
 79 #include <net/sctp/sctp.h>
 80 #include <net/sctp/sm.h>
 81 
 82 /* Forward declarations for internal helper functions. */
 83 static int sctp_writeable(struct sock *sk);
 84 static void sctp_wfree(struct sk_buff *skb);
 85 static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
 86                                 size_t msg_len);
 87 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
 88 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
 89 static int sctp_wait_for_accept(struct sock *sk, long timeo);
 90 static void sctp_wait_for_close(struct sock *sk, long timeo);
 91 static void sctp_destruct_sock(struct sock *sk);
 92 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 93                                         union sctp_addr *addr, int len);
 94 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
 95 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
 96 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
 97 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
 98 static int sctp_send_asconf(struct sctp_association *asoc,
 99                             struct sctp_chunk *chunk);
100 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
101 static int sctp_autobind(struct sock *sk);
102 static void sctp_sock_migrate(struct sock *, struct sock *,
103                               struct sctp_association *, sctp_socket_type_t);
104 
105 extern struct kmem_cache *sctp_bucket_cachep;
106 extern long sysctl_sctp_mem[3];
107 extern int sysctl_sctp_rmem[3];
108 extern int sysctl_sctp_wmem[3];
109 
110 static int sctp_memory_pressure;
111 static atomic_long_t sctp_memory_allocated;
112 struct percpu_counter sctp_sockets_allocated;
113 
114 static void sctp_enter_memory_pressure(struct sock *sk)
115 {
116         sctp_memory_pressure = 1;
117 }
118 
119 
120 /* Get the sndbuf space available at the time on the association.  */
121 static inline int sctp_wspace(struct sctp_association *asoc)
122 {
123         int amt;
124 
125         if (asoc->ep->sndbuf_policy)
126                 amt = asoc->sndbuf_used;
127         else
128                 amt = sk_wmem_alloc_get(asoc->base.sk);
129 
130         if (amt >= asoc->base.sk->sk_sndbuf) {
131                 if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
132                         amt = 0;
133                 else {
134                         amt = sk_stream_wspace(asoc->base.sk);
135                         if (amt < 0)
136                                 amt = 0;
137                 }
138         } else {
139                 amt = asoc->base.sk->sk_sndbuf - amt;
140         }
141         return amt;
142 }
143 
144 /* Increment the used sndbuf space count of the corresponding association by
145  * the size of the outgoing data chunk.
146  * Also, set the skb destructor for sndbuf accounting later.
147  *
148  * Since it is always 1-1 between chunk and skb, and also a new skb is always
149  * allocated for chunk bundling in sctp_packet_transmit(), we can use the
150  * destructor in the data chunk skb for the purpose of the sndbuf space
151  * tracking.
152  */
153 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
154 {
155         struct sctp_association *asoc = chunk->asoc;
156         struct sock *sk = asoc->base.sk;
157 
158         /* The sndbuf space is tracked per association.  */
159         sctp_association_hold(asoc);
160 
161         skb_set_owner_w(chunk->skb, sk);
162 
163         chunk->skb->destructor = sctp_wfree;
164         /* Save the chunk pointer in skb for sctp_wfree to use later.  */
165         skb_shinfo(chunk->skb)->destructor_arg = chunk;
166 
167         asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
168                                 sizeof(struct sk_buff) +
169                                 sizeof(struct sctp_chunk);
170 
171         atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
172         sk->sk_wmem_queued += chunk->skb->truesize;
173         sk_mem_charge(sk, chunk->skb->truesize);
174 }
175 
176 /* Verify that this is a valid address. */
177 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
178                                    int len)
179 {
180         struct sctp_af *af;
181 
182         /* Verify basic sockaddr. */
183         af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
184         if (!af)
185                 return -EINVAL;
186 
187         /* Is this a valid SCTP address?  */
188         if (!af->addr_valid(addr, sctp_sk(sk), NULL))
189                 return -EINVAL;
190 
191         if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
192                 return -EINVAL;
193 
194         return 0;
195 }
196 
197 /* Look up the association by its id.  If this is not a UDP-style
198  * socket, the ID field is always ignored.
199  */
200 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
201 {
202         struct sctp_association *asoc = NULL;
203 
204         /* If this is not a UDP-style socket, assoc id should be ignored. */
205         if (!sctp_style(sk, UDP)) {
206                 /* Return NULL if the socket state is not ESTABLISHED. It
207                  * could be a TCP-style listening socket or a socket which
208                  * hasn't yet called connect() to establish an association.
209                  */
210                 if (!sctp_sstate(sk, ESTABLISHED))
211                         return NULL;
212 
213                 /* Get the first and the only association from the list. */
214                 if (!list_empty(&sctp_sk(sk)->ep->asocs))
215                         asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
216                                           struct sctp_association, asocs);
217                 return asoc;
218         }
219 
220         /* Otherwise this is a UDP-style socket. */
221         if (!id || (id == (sctp_assoc_t)-1))
222                 return NULL;
223 
224         spin_lock_bh(&sctp_assocs_id_lock);
225         asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
226         spin_unlock_bh(&sctp_assocs_id_lock);
227 
228         if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
229                 return NULL;
230 
231         return asoc;
232 }
233 
234 /* Look up the transport from an address and an assoc id. If both address and
235  * id are specified, the associations matching the address and the id should be
236  * the same.
237  */
238 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
239                                               struct sockaddr_storage *addr,
240                                               sctp_assoc_t id)
241 {
242         struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
243         struct sctp_transport *transport;
244         union sctp_addr *laddr = (union sctp_addr *)addr;
245 
246         addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
247                                                laddr,
248                                                &transport);
249 
250         if (!addr_asoc)
251                 return NULL;
252 
253         id_asoc = sctp_id2assoc(sk, id);
254         if (id_asoc && (id_asoc != addr_asoc))
255                 return NULL;
256 
257         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
258                                                 (union sctp_addr *)addr);
259 
260         return transport;
261 }
262 
263 /* API 3.1.2 bind() - UDP Style Syntax
264  * The syntax of bind() is,
265  *
266  *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
267  *
268  *   sd      - the socket descriptor returned by socket().
269  *   addr    - the address structure (struct sockaddr_in or struct
270  *             sockaddr_in6 [RFC 2553]),
271  *   addr_len - the size of the address structure.
272  */
273 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
274 {
275         int retval = 0;
276 
277         lock_sock(sk);
278 
279         pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
280                  addr, addr_len);
281 
282         /* Disallow binding twice. */
283         if (!sctp_sk(sk)->ep->base.bind_addr.port)
284                 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
285                                       addr_len);
286         else
287                 retval = -EINVAL;
288 
289         release_sock(sk);
290 
291         return retval;
292 }
293 
294 static long sctp_get_port_local(struct sock *, union sctp_addr *);
295 
296 /* Verify this is a valid sockaddr. */
297 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
298                                         union sctp_addr *addr, int len)
299 {
300         struct sctp_af *af;
301 
302         /* Check minimum size.  */
303         if (len < sizeof (struct sockaddr))
304                 return NULL;
305 
306         /* V4 mapped address are really of AF_INET family */
307         if (addr->sa.sa_family == AF_INET6 &&
308             ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
309                 if (!opt->pf->af_supported(AF_INET, opt))
310                         return NULL;
311         } else {
312                 /* Does this PF support this AF? */
313                 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
314                         return NULL;
315         }
316 
317         /* If we get this far, af is valid. */
318         af = sctp_get_af_specific(addr->sa.sa_family);
319 
320         if (len < af->sockaddr_len)
321                 return NULL;
322 
323         return af;
324 }
325 
326 /* Bind a local address either to an endpoint or to an association.  */
327 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
328 {
329         struct net *net = sock_net(sk);
330         struct sctp_sock *sp = sctp_sk(sk);
331         struct sctp_endpoint *ep = sp->ep;
332         struct sctp_bind_addr *bp = &ep->base.bind_addr;
333         struct sctp_af *af;
334         unsigned short snum;
335         int ret = 0;
336 
337         /* Common sockaddr verification. */
338         af = sctp_sockaddr_af(sp, addr, len);
339         if (!af) {
340                 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
341                          __func__, sk, addr, len);
342                 return -EINVAL;
343         }
344 
345         snum = ntohs(addr->v4.sin_port);
346 
347         pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
348                  __func__, sk, &addr->sa, bp->port, snum, len);
349 
350         /* PF specific bind() address verification. */
351         if (!sp->pf->bind_verify(sp, addr))
352                 return -EADDRNOTAVAIL;
353 
354         /* We must either be unbound, or bind to the same port.
355          * It's OK to allow 0 ports if we are already bound.
356          * We'll just inhert an already bound port in this case
357          */
358         if (bp->port) {
359                 if (!snum)
360                         snum = bp->port;
361                 else if (snum != bp->port) {
362                         pr_debug("%s: new port %d doesn't match existing port "
363                                  "%d\n", __func__, snum, bp->port);
364                         return -EINVAL;
365                 }
366         }
367 
368         if (snum && snum < PROT_SOCK &&
369             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
370                 return -EACCES;
371 
372         /* See if the address matches any of the addresses we may have
373          * already bound before checking against other endpoints.
374          */
375         if (sctp_bind_addr_match(bp, addr, sp))
376                 return -EINVAL;
377 
378         /* Make sure we are allowed to bind here.
379          * The function sctp_get_port_local() does duplicate address
380          * detection.
381          */
382         addr->v4.sin_port = htons(snum);
383         if ((ret = sctp_get_port_local(sk, addr))) {
384                 return -EADDRINUSE;
385         }
386 
387         /* Refresh ephemeral port.  */
388         if (!bp->port)
389                 bp->port = inet_sk(sk)->inet_num;
390 
391         /* Add the address to the bind address list.
392          * Use GFP_ATOMIC since BHs will be disabled.
393          */
394         ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
395 
396         /* Copy back into socket for getsockname() use. */
397         if (!ret) {
398                 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
399                 sp->pf->to_sk_saddr(addr, sk);
400         }
401 
402         return ret;
403 }
404 
405  /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
406  *
407  * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
408  * at any one time.  If a sender, after sending an ASCONF chunk, decides
409  * it needs to transfer another ASCONF Chunk, it MUST wait until the
410  * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
411  * subsequent ASCONF. Note this restriction binds each side, so at any
412  * time two ASCONF may be in-transit on any given association (one sent
413  * from each endpoint).
414  */
415 static int sctp_send_asconf(struct sctp_association *asoc,
416                             struct sctp_chunk *chunk)
417 {
418         struct net      *net = sock_net(asoc->base.sk);
419         int             retval = 0;
420 
421         /* If there is an outstanding ASCONF chunk, queue it for later
422          * transmission.
423          */
424         if (asoc->addip_last_asconf) {
425                 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
426                 goto out;
427         }
428 
429         /* Hold the chunk until an ASCONF_ACK is received. */
430         sctp_chunk_hold(chunk);
431         retval = sctp_primitive_ASCONF(net, asoc, chunk);
432         if (retval)
433                 sctp_chunk_free(chunk);
434         else
435                 asoc->addip_last_asconf = chunk;
436 
437 out:
438         return retval;
439 }
440 
441 /* Add a list of addresses as bind addresses to local endpoint or
442  * association.
443  *
444  * Basically run through each address specified in the addrs/addrcnt
445  * array/length pair, determine if it is IPv6 or IPv4 and call
446  * sctp_do_bind() on it.
447  *
448  * If any of them fails, then the operation will be reversed and the
449  * ones that were added will be removed.
450  *
451  * Only sctp_setsockopt_bindx() is supposed to call this function.
452  */
453 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
454 {
455         int cnt;
456         int retval = 0;
457         void *addr_buf;
458         struct sockaddr *sa_addr;
459         struct sctp_af *af;
460 
461         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
462                  addrs, addrcnt);
463 
464         addr_buf = addrs;
465         for (cnt = 0; cnt < addrcnt; cnt++) {
466                 /* The list may contain either IPv4 or IPv6 address;
467                  * determine the address length for walking thru the list.
468                  */
469                 sa_addr = addr_buf;
470                 af = sctp_get_af_specific(sa_addr->sa_family);
471                 if (!af) {
472                         retval = -EINVAL;
473                         goto err_bindx_add;
474                 }
475 
476                 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
477                                       af->sockaddr_len);
478 
479                 addr_buf += af->sockaddr_len;
480 
481 err_bindx_add:
482                 if (retval < 0) {
483                         /* Failed. Cleanup the ones that have been added */
484                         if (cnt > 0)
485                                 sctp_bindx_rem(sk, addrs, cnt);
486                         return retval;
487                 }
488         }
489 
490         return retval;
491 }
492 
493 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
494  * associations that are part of the endpoint indicating that a list of local
495  * addresses are added to the endpoint.
496  *
497  * If any of the addresses is already in the bind address list of the
498  * association, we do not send the chunk for that association.  But it will not
499  * affect other associations.
500  *
501  * Only sctp_setsockopt_bindx() is supposed to call this function.
502  */
503 static int sctp_send_asconf_add_ip(struct sock          *sk,
504                                    struct sockaddr      *addrs,
505                                    int                  addrcnt)
506 {
507         struct net *net = sock_net(sk);
508         struct sctp_sock                *sp;
509         struct sctp_endpoint            *ep;
510         struct sctp_association         *asoc;
511         struct sctp_bind_addr           *bp;
512         struct sctp_chunk               *chunk;
513         struct sctp_sockaddr_entry      *laddr;
514         union sctp_addr                 *addr;
515         union sctp_addr                 saveaddr;
516         void                            *addr_buf;
517         struct sctp_af                  *af;
518         struct list_head                *p;
519         int                             i;
520         int                             retval = 0;
521 
522         if (!net->sctp.addip_enable)
523                 return retval;
524 
525         sp = sctp_sk(sk);
526         ep = sp->ep;
527 
528         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
529                  __func__, sk, addrs, addrcnt);
530 
531         list_for_each_entry(asoc, &ep->asocs, asocs) {
532                 if (!asoc->peer.asconf_capable)
533                         continue;
534 
535                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
536                         continue;
537 
538                 if (!sctp_state(asoc, ESTABLISHED))
539                         continue;
540 
541                 /* Check if any address in the packed array of addresses is
542                  * in the bind address list of the association. If so,
543                  * do not send the asconf chunk to its peer, but continue with
544                  * other associations.
545                  */
546                 addr_buf = addrs;
547                 for (i = 0; i < addrcnt; i++) {
548                         addr = addr_buf;
549                         af = sctp_get_af_specific(addr->v4.sin_family);
550                         if (!af) {
551                                 retval = -EINVAL;
552                                 goto out;
553                         }
554 
555                         if (sctp_assoc_lookup_laddr(asoc, addr))
556                                 break;
557 
558                         addr_buf += af->sockaddr_len;
559                 }
560                 if (i < addrcnt)
561                         continue;
562 
563                 /* Use the first valid address in bind addr list of
564                  * association as Address Parameter of ASCONF CHUNK.
565                  */
566                 bp = &asoc->base.bind_addr;
567                 p = bp->address_list.next;
568                 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
569                 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
570                                                    addrcnt, SCTP_PARAM_ADD_IP);
571                 if (!chunk) {
572                         retval = -ENOMEM;
573                         goto out;
574                 }
575 
576                 /* Add the new addresses to the bind address list with
577                  * use_as_src set to 0.
578                  */
579                 addr_buf = addrs;
580                 for (i = 0; i < addrcnt; i++) {
581                         addr = addr_buf;
582                         af = sctp_get_af_specific(addr->v4.sin_family);
583                         memcpy(&saveaddr, addr, af->sockaddr_len);
584                         retval = sctp_add_bind_addr(bp, &saveaddr,
585                                                     SCTP_ADDR_NEW, GFP_ATOMIC);
586                         addr_buf += af->sockaddr_len;
587                 }
588                 if (asoc->src_out_of_asoc_ok) {
589                         struct sctp_transport *trans;
590 
591                         list_for_each_entry(trans,
592                             &asoc->peer.transport_addr_list, transports) {
593                                 /* Clear the source and route cache */
594                                 dst_release(trans->dst);
595                                 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
596                                     2*asoc->pathmtu, 4380));
597                                 trans->ssthresh = asoc->peer.i.a_rwnd;
598                                 trans->rto = asoc->rto_initial;
599                                 sctp_max_rto(asoc, trans);
600                                 trans->rtt = trans->srtt = trans->rttvar = 0;
601                                 sctp_transport_route(trans, NULL,
602                                     sctp_sk(asoc->base.sk));
603                         }
604                 }
605                 retval = sctp_send_asconf(asoc, chunk);
606         }
607 
608 out:
609         return retval;
610 }
611 
612 /* Remove a list of addresses from bind addresses list.  Do not remove the
613  * last address.
614  *
615  * Basically run through each address specified in the addrs/addrcnt
616  * array/length pair, determine if it is IPv6 or IPv4 and call
617  * sctp_del_bind() on it.
618  *
619  * If any of them fails, then the operation will be reversed and the
620  * ones that were removed will be added back.
621  *
622  * At least one address has to be left; if only one address is
623  * available, the operation will return -EBUSY.
624  *
625  * Only sctp_setsockopt_bindx() is supposed to call this function.
626  */
627 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
628 {
629         struct sctp_sock *sp = sctp_sk(sk);
630         struct sctp_endpoint *ep = sp->ep;
631         int cnt;
632         struct sctp_bind_addr *bp = &ep->base.bind_addr;
633         int retval = 0;
634         void *addr_buf;
635         union sctp_addr *sa_addr;
636         struct sctp_af *af;
637 
638         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
639                  __func__, sk, addrs, addrcnt);
640 
641         addr_buf = addrs;
642         for (cnt = 0; cnt < addrcnt; cnt++) {
643                 /* If the bind address list is empty or if there is only one
644                  * bind address, there is nothing more to be removed (we need
645                  * at least one address here).
646                  */
647                 if (list_empty(&bp->address_list) ||
648                     (sctp_list_single_entry(&bp->address_list))) {
649                         retval = -EBUSY;
650                         goto err_bindx_rem;
651                 }
652 
653                 sa_addr = addr_buf;
654                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
655                 if (!af) {
656                         retval = -EINVAL;
657                         goto err_bindx_rem;
658                 }
659 
660                 if (!af->addr_valid(sa_addr, sp, NULL)) {
661                         retval = -EADDRNOTAVAIL;
662                         goto err_bindx_rem;
663                 }
664 
665                 if (sa_addr->v4.sin_port &&
666                     sa_addr->v4.sin_port != htons(bp->port)) {
667                         retval = -EINVAL;
668                         goto err_bindx_rem;
669                 }
670 
671                 if (!sa_addr->v4.sin_port)
672                         sa_addr->v4.sin_port = htons(bp->port);
673 
674                 /* FIXME - There is probably a need to check if sk->sk_saddr and
675                  * sk->sk_rcv_addr are currently set to one of the addresses to
676                  * be removed. This is something which needs to be looked into
677                  * when we are fixing the outstanding issues with multi-homing
678                  * socket routing and failover schemes. Refer to comments in
679                  * sctp_do_bind(). -daisy
680                  */
681                 retval = sctp_del_bind_addr(bp, sa_addr);
682 
683                 addr_buf += af->sockaddr_len;
684 err_bindx_rem:
685                 if (retval < 0) {
686                         /* Failed. Add the ones that has been removed back */
687                         if (cnt > 0)
688                                 sctp_bindx_add(sk, addrs, cnt);
689                         return retval;
690                 }
691         }
692 
693         return retval;
694 }
695 
696 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
697  * the associations that are part of the endpoint indicating that a list of
698  * local addresses are removed from the endpoint.
699  *
700  * If any of the addresses is already in the bind address list of the
701  * association, we do not send the chunk for that association.  But it will not
702  * affect other associations.
703  *
704  * Only sctp_setsockopt_bindx() is supposed to call this function.
705  */
706 static int sctp_send_asconf_del_ip(struct sock          *sk,
707                                    struct sockaddr      *addrs,
708                                    int                  addrcnt)
709 {
710         struct net *net = sock_net(sk);
711         struct sctp_sock        *sp;
712         struct sctp_endpoint    *ep;
713         struct sctp_association *asoc;
714         struct sctp_transport   *transport;
715         struct sctp_bind_addr   *bp;
716         struct sctp_chunk       *chunk;
717         union sctp_addr         *laddr;
718         void                    *addr_buf;
719         struct sctp_af          *af;
720         struct sctp_sockaddr_entry *saddr;
721         int                     i;
722         int                     retval = 0;
723         int                     stored = 0;
724 
725         chunk = NULL;
726         if (!net->sctp.addip_enable)
727                 return retval;
728 
729         sp = sctp_sk(sk);
730         ep = sp->ep;
731 
732         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
733                  __func__, sk, addrs, addrcnt);
734 
735         list_for_each_entry(asoc, &ep->asocs, asocs) {
736 
737                 if (!asoc->peer.asconf_capable)
738                         continue;
739 
740                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
741                         continue;
742 
743                 if (!sctp_state(asoc, ESTABLISHED))
744                         continue;
745 
746                 /* Check if any address in the packed array of addresses is
747                  * not present in the bind address list of the association.
748                  * If so, do not send the asconf chunk to its peer, but
749                  * continue with other associations.
750                  */
751                 addr_buf = addrs;
752                 for (i = 0; i < addrcnt; i++) {
753                         laddr = addr_buf;
754                         af = sctp_get_af_specific(laddr->v4.sin_family);
755                         if (!af) {
756                                 retval = -EINVAL;
757                                 goto out;
758                         }
759 
760                         if (!sctp_assoc_lookup_laddr(asoc, laddr))
761                                 break;
762 
763                         addr_buf += af->sockaddr_len;
764                 }
765                 if (i < addrcnt)
766                         continue;
767 
768                 /* Find one address in the association's bind address list
769                  * that is not in the packed array of addresses. This is to
770                  * make sure that we do not delete all the addresses in the
771                  * association.
772                  */
773                 bp = &asoc->base.bind_addr;
774                 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
775                                                addrcnt, sp);
776                 if ((laddr == NULL) && (addrcnt == 1)) {
777                         if (asoc->asconf_addr_del_pending)
778                                 continue;
779                         asoc->asconf_addr_del_pending =
780                             kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
781                         if (asoc->asconf_addr_del_pending == NULL) {
782                                 retval = -ENOMEM;
783                                 goto out;
784                         }
785                         asoc->asconf_addr_del_pending->sa.sa_family =
786                                     addrs->sa_family;
787                         asoc->asconf_addr_del_pending->v4.sin_port =
788                                     htons(bp->port);
789                         if (addrs->sa_family == AF_INET) {
790                                 struct sockaddr_in *sin;
791 
792                                 sin = (struct sockaddr_in *)addrs;
793                                 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
794                         } else if (addrs->sa_family == AF_INET6) {
795                                 struct sockaddr_in6 *sin6;
796 
797                                 sin6 = (struct sockaddr_in6 *)addrs;
798                                 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
799                         }
800 
801                         pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
802                                  __func__, asoc, &asoc->asconf_addr_del_pending->sa,
803                                  asoc->asconf_addr_del_pending);
804 
805                         asoc->src_out_of_asoc_ok = 1;
806                         stored = 1;
807                         goto skip_mkasconf;
808                 }
809 
810                 if (laddr == NULL)
811                         return -EINVAL;
812 
813                 /* We do not need RCU protection throughout this loop
814                  * because this is done under a socket lock from the
815                  * setsockopt call.
816                  */
817                 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
818                                                    SCTP_PARAM_DEL_IP);
819                 if (!chunk) {
820                         retval = -ENOMEM;
821                         goto out;
822                 }
823 
824 skip_mkasconf:
825                 /* Reset use_as_src flag for the addresses in the bind address
826                  * list that are to be deleted.
827                  */
828                 addr_buf = addrs;
829                 for (i = 0; i < addrcnt; i++) {
830                         laddr = addr_buf;
831                         af = sctp_get_af_specific(laddr->v4.sin_family);
832                         list_for_each_entry(saddr, &bp->address_list, list) {
833                                 if (sctp_cmp_addr_exact(&saddr->a, laddr))
834                                         saddr->state = SCTP_ADDR_DEL;
835                         }
836                         addr_buf += af->sockaddr_len;
837                 }
838 
839                 /* Update the route and saddr entries for all the transports
840                  * as some of the addresses in the bind address list are
841                  * about to be deleted and cannot be used as source addresses.
842                  */
843                 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
844                                         transports) {
845                         dst_release(transport->dst);
846                         sctp_transport_route(transport, NULL,
847                                              sctp_sk(asoc->base.sk));
848                 }
849 
850                 if (stored)
851                         /* We don't need to transmit ASCONF */
852                         continue;
853                 retval = sctp_send_asconf(asoc, chunk);
854         }
855 out:
856         return retval;
857 }
858 
859 /* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
860 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
861 {
862         struct sock *sk = sctp_opt2sk(sp);
863         union sctp_addr *addr;
864         struct sctp_af *af;
865 
866         /* It is safe to write port space in caller. */
867         addr = &addrw->a;
868         addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
869         af = sctp_get_af_specific(addr->sa.sa_family);
870         if (!af)
871                 return -EINVAL;
872         if (sctp_verify_addr(sk, addr, af->sockaddr_len))
873                 return -EINVAL;
874 
875         if (addrw->state == SCTP_ADDR_NEW)
876                 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
877         else
878                 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
879 }
880 
881 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
882  *
883  * API 8.1
884  * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
885  *                int flags);
886  *
887  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
888  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
889  * or IPv6 addresses.
890  *
891  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
892  * Section 3.1.2 for this usage.
893  *
894  * addrs is a pointer to an array of one or more socket addresses. Each
895  * address is contained in its appropriate structure (i.e. struct
896  * sockaddr_in or struct sockaddr_in6) the family of the address type
897  * must be used to distinguish the address length (note that this
898  * representation is termed a "packed array" of addresses). The caller
899  * specifies the number of addresses in the array with addrcnt.
900  *
901  * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
902  * -1, and sets errno to the appropriate error code.
903  *
904  * For SCTP, the port given in each socket address must be the same, or
905  * sctp_bindx() will fail, setting errno to EINVAL.
906  *
907  * The flags parameter is formed from the bitwise OR of zero or more of
908  * the following currently defined flags:
909  *
910  * SCTP_BINDX_ADD_ADDR
911  *
912  * SCTP_BINDX_REM_ADDR
913  *
914  * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
915  * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
916  * addresses from the association. The two flags are mutually exclusive;
917  * if both are given, sctp_bindx() will fail with EINVAL. A caller may
918  * not remove all addresses from an association; sctp_bindx() will
919  * reject such an attempt with EINVAL.
920  *
921  * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
922  * additional addresses with an endpoint after calling bind().  Or use
923  * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
924  * socket is associated with so that no new association accepted will be
925  * associated with those addresses. If the endpoint supports dynamic
926  * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
927  * endpoint to send the appropriate message to the peer to change the
928  * peers address lists.
929  *
930  * Adding and removing addresses from a connected association is
931  * optional functionality. Implementations that do not support this
932  * functionality should return EOPNOTSUPP.
933  *
934  * Basically do nothing but copying the addresses from user to kernel
935  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
936  * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
937  * from userspace.
938  *
939  * We don't use copy_from_user() for optimization: we first do the
940  * sanity checks (buffer size -fast- and access check-healthy
941  * pointer); if all of those succeed, then we can alloc the memory
942  * (expensive operation) needed to copy the data to kernel. Then we do
943  * the copying without checking the user space area
944  * (__copy_from_user()).
945  *
946  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
947  * it.
948  *
949  * sk        The sk of the socket
950  * addrs     The pointer to the addresses in user land
951  * addrssize Size of the addrs buffer
952  * op        Operation to perform (add or remove, see the flags of
953  *           sctp_bindx)
954  *
955  * Returns 0 if ok, <0 errno code on error.
956  */
957 static int sctp_setsockopt_bindx(struct sock *sk,
958                                  struct sockaddr __user *addrs,
959                                  int addrs_size, int op)
960 {
961         struct sockaddr *kaddrs;
962         int err;
963         int addrcnt = 0;
964         int walk_size = 0;
965         struct sockaddr *sa_addr;
966         void *addr_buf;
967         struct sctp_af *af;
968 
969         pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
970                  __func__, sk, addrs, addrs_size, op);
971 
972         if (unlikely(addrs_size <= 0))
973                 return -EINVAL;
974 
975         /* Check the user passed a healthy pointer.  */
976         if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
977                 return -EFAULT;
978 
979         /* Alloc space for the address array in kernel memory.  */
980         kaddrs = kmalloc(addrs_size, GFP_KERNEL);
981         if (unlikely(!kaddrs))
982                 return -ENOMEM;
983 
984         if (__copy_from_user(kaddrs, addrs, addrs_size)) {
985                 kfree(kaddrs);
986                 return -EFAULT;
987         }
988 
989         /* Walk through the addrs buffer and count the number of addresses. */
990         addr_buf = kaddrs;
991         while (walk_size < addrs_size) {
992                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
993                         kfree(kaddrs);
994                         return -EINVAL;
995                 }
996 
997                 sa_addr = addr_buf;
998                 af = sctp_get_af_specific(sa_addr->sa_family);
999 
1000                 /* If the address family is not supported or if this address
1001                  * causes the address buffer to overflow return EINVAL.
1002                  */
1003                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1004                         kfree(kaddrs);
1005                         return -EINVAL;
1006                 }
1007                 addrcnt++;
1008                 addr_buf += af->sockaddr_len;
1009                 walk_size += af->sockaddr_len;
1010         }
1011 
1012         /* Do the work. */
1013         switch (op) {
1014         case SCTP_BINDX_ADD_ADDR:
1015                 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1016                 if (err)
1017                         goto out;
1018                 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1019                 break;
1020 
1021         case SCTP_BINDX_REM_ADDR:
1022                 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1023                 if (err)
1024                         goto out;
1025                 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1026                 break;
1027 
1028         default:
1029                 err = -EINVAL;
1030                 break;
1031         }
1032 
1033 out:
1034         kfree(kaddrs);
1035 
1036         return err;
1037 }
1038 
1039 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1040  *
1041  * Common routine for handling connect() and sctp_connectx().
1042  * Connect will come in with just a single address.
1043  */
1044 static int __sctp_connect(struct sock *sk,
1045                           struct sockaddr *kaddrs,
1046                           int addrs_size,
1047                           sctp_assoc_t *assoc_id)
1048 {
1049         struct net *net = sock_net(sk);
1050         struct sctp_sock *sp;
1051         struct sctp_endpoint *ep;
1052         struct sctp_association *asoc = NULL;
1053         struct sctp_association *asoc2;
1054         struct sctp_transport *transport;
1055         union sctp_addr to;
1056         sctp_scope_t scope;
1057         long timeo;
1058         int err = 0;
1059         int addrcnt = 0;
1060         int walk_size = 0;
1061         union sctp_addr *sa_addr = NULL;
1062         void *addr_buf;
1063         unsigned short port;
1064         unsigned int f_flags = 0;
1065 
1066         sp = sctp_sk(sk);
1067         ep = sp->ep;
1068 
1069         /* connect() cannot be done on a socket that is already in ESTABLISHED
1070          * state - UDP-style peeled off socket or a TCP-style socket that
1071          * is already connected.
1072          * It cannot be done even on a TCP-style listening socket.
1073          */
1074         if (sctp_sstate(sk, ESTABLISHED) ||
1075             (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1076                 err = -EISCONN;
1077                 goto out_free;
1078         }
1079 
1080         /* Walk through the addrs buffer and count the number of addresses. */
1081         addr_buf = kaddrs;
1082         while (walk_size < addrs_size) {
1083                 struct sctp_af *af;
1084 
1085                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1086                         err = -EINVAL;
1087                         goto out_free;
1088                 }
1089 
1090                 sa_addr = addr_buf;
1091                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1092 
1093                 /* If the address family is not supported or if this address
1094                  * causes the address buffer to overflow return EINVAL.
1095                  */
1096                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1097                         err = -EINVAL;
1098                         goto out_free;
1099                 }
1100 
1101                 port = ntohs(sa_addr->v4.sin_port);
1102 
1103                 /* Save current address so we can work with it */
1104                 memcpy(&to, sa_addr, af->sockaddr_len);
1105 
1106                 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1107                 if (err)
1108                         goto out_free;
1109 
1110                 /* Make sure the destination port is correctly set
1111                  * in all addresses.
1112                  */
1113                 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1114                         err = -EINVAL;
1115                         goto out_free;
1116                 }
1117 
1118                 /* Check if there already is a matching association on the
1119                  * endpoint (other than the one created here).
1120                  */
1121                 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1122                 if (asoc2 && asoc2 != asoc) {
1123                         if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1124                                 err = -EISCONN;
1125                         else
1126                                 err = -EALREADY;
1127                         goto out_free;
1128                 }
1129 
1130                 /* If we could not find a matching association on the endpoint,
1131                  * make sure that there is no peeled-off association matching
1132                  * the peer address even on another socket.
1133                  */
1134                 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1135                         err = -EADDRNOTAVAIL;
1136                         goto out_free;
1137                 }
1138 
1139                 if (!asoc) {
1140                         /* If a bind() or sctp_bindx() is not called prior to
1141                          * an sctp_connectx() call, the system picks an
1142                          * ephemeral port and will choose an address set
1143                          * equivalent to binding with a wildcard address.
1144                          */
1145                         if (!ep->base.bind_addr.port) {
1146                                 if (sctp_autobind(sk)) {
1147                                         err = -EAGAIN;
1148                                         goto out_free;
1149                                 }
1150                         } else {
1151                                 /*
1152                                  * If an unprivileged user inherits a 1-many
1153                                  * style socket with open associations on a
1154                                  * privileged port, it MAY be permitted to
1155                                  * accept new associations, but it SHOULD NOT
1156                                  * be permitted to open new associations.
1157                                  */
1158                                 if (ep->base.bind_addr.port < PROT_SOCK &&
1159                                     !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1160                                         err = -EACCES;
1161                                         goto out_free;
1162                                 }
1163                         }
1164 
1165                         scope = sctp_scope(&to);
1166                         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1167                         if (!asoc) {
1168                                 err = -ENOMEM;
1169                                 goto out_free;
1170                         }
1171 
1172                         err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1173                                                               GFP_KERNEL);
1174                         if (err < 0) {
1175                                 goto out_free;
1176                         }
1177 
1178                 }
1179 
1180                 /* Prime the peer's transport structures.  */
1181                 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1182                                                 SCTP_UNKNOWN);
1183                 if (!transport) {
1184                         err = -ENOMEM;
1185                         goto out_free;
1186                 }
1187 
1188                 addrcnt++;
1189                 addr_buf += af->sockaddr_len;
1190                 walk_size += af->sockaddr_len;
1191         }
1192 
1193         /* In case the user of sctp_connectx() wants an association
1194          * id back, assign one now.
1195          */
1196         if (assoc_id) {
1197                 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1198                 if (err < 0)
1199                         goto out_free;
1200         }
1201 
1202         err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1203         if (err < 0) {
1204                 goto out_free;
1205         }
1206 
1207         /* Initialize sk's dport and daddr for getpeername() */
1208         inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1209         sp->pf->to_sk_daddr(sa_addr, sk);
1210         sk->sk_err = 0;
1211 
1212         /* in-kernel sockets don't generally have a file allocated to them
1213          * if all they do is call sock_create_kern().
1214          */
1215         if (sk->sk_socket->file)
1216                 f_flags = sk->sk_socket->file->f_flags;
1217 
1218         timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1219 
1220         err = sctp_wait_for_connect(asoc, &timeo);
1221         if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1222                 *assoc_id = asoc->assoc_id;
1223 
1224         /* Don't free association on exit. */
1225         asoc = NULL;
1226 
1227 out_free:
1228         pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1229                  __func__, asoc, kaddrs, err);
1230 
1231         if (asoc) {
1232                 /* sctp_primitive_ASSOCIATE may have added this association
1233                  * To the hash table, try to unhash it, just in case, its a noop
1234                  * if it wasn't hashed so we're safe
1235                  */
1236                 sctp_unhash_established(asoc);
1237                 sctp_association_free(asoc);
1238         }
1239         return err;
1240 }
1241 
1242 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1243  *
1244  * API 8.9
1245  * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1246  *                      sctp_assoc_t *asoc);
1247  *
1248  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1249  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1250  * or IPv6 addresses.
1251  *
1252  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1253  * Section 3.1.2 for this usage.
1254  *
1255  * addrs is a pointer to an array of one or more socket addresses. Each
1256  * address is contained in its appropriate structure (i.e. struct
1257  * sockaddr_in or struct sockaddr_in6) the family of the address type
1258  * must be used to distengish the address length (note that this
1259  * representation is termed a "packed array" of addresses). The caller
1260  * specifies the number of addresses in the array with addrcnt.
1261  *
1262  * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1263  * the association id of the new association.  On failure, sctp_connectx()
1264  * returns -1, and sets errno to the appropriate error code.  The assoc_id
1265  * is not touched by the kernel.
1266  *
1267  * For SCTP, the port given in each socket address must be the same, or
1268  * sctp_connectx() will fail, setting errno to EINVAL.
1269  *
1270  * An application can use sctp_connectx to initiate an association with
1271  * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1272  * allows a caller to specify multiple addresses at which a peer can be
1273  * reached.  The way the SCTP stack uses the list of addresses to set up
1274  * the association is implementation dependent.  This function only
1275  * specifies that the stack will try to make use of all the addresses in
1276  * the list when needed.
1277  *
1278  * Note that the list of addresses passed in is only used for setting up
1279  * the association.  It does not necessarily equal the set of addresses
1280  * the peer uses for the resulting association.  If the caller wants to
1281  * find out the set of peer addresses, it must use sctp_getpaddrs() to
1282  * retrieve them after the association has been set up.
1283  *
1284  * Basically do nothing but copying the addresses from user to kernel
1285  * land and invoking either sctp_connectx(). This is used for tunneling
1286  * the sctp_connectx() request through sctp_setsockopt() from userspace.
1287  *
1288  * We don't use copy_from_user() for optimization: we first do the
1289  * sanity checks (buffer size -fast- and access check-healthy
1290  * pointer); if all of those succeed, then we can alloc the memory
1291  * (expensive operation) needed to copy the data to kernel. Then we do
1292  * the copying without checking the user space area
1293  * (__copy_from_user()).
1294  *
1295  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1296  * it.
1297  *
1298  * sk        The sk of the socket
1299  * addrs     The pointer to the addresses in user land
1300  * addrssize Size of the addrs buffer
1301  *
1302  * Returns >=0 if ok, <0 errno code on error.
1303  */
1304 static int __sctp_setsockopt_connectx(struct sock *sk,
1305                                       struct sockaddr __user *addrs,
1306                                       int addrs_size,
1307                                       sctp_assoc_t *assoc_id)
1308 {
1309         int err = 0;
1310         struct sockaddr *kaddrs;
1311 
1312         pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1313                  __func__, sk, addrs, addrs_size);
1314 
1315         if (unlikely(addrs_size <= 0))
1316                 return -EINVAL;
1317 
1318         /* Check the user passed a healthy pointer.  */
1319         if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1320                 return -EFAULT;
1321 
1322         /* Alloc space for the address array in kernel memory.  */
1323         kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1324         if (unlikely(!kaddrs))
1325                 return -ENOMEM;
1326 
1327         if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1328                 err = -EFAULT;
1329         } else {
1330                 err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1331         }
1332 
1333         kfree(kaddrs);
1334 
1335         return err;
1336 }
1337 
1338 /*
1339  * This is an older interface.  It's kept for backward compatibility
1340  * to the option that doesn't provide association id.
1341  */
1342 static int sctp_setsockopt_connectx_old(struct sock *sk,
1343                                         struct sockaddr __user *addrs,
1344                                         int addrs_size)
1345 {
1346         return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1347 }
1348 
1349 /*
1350  * New interface for the API.  The since the API is done with a socket
1351  * option, to make it simple we feed back the association id is as a return
1352  * indication to the call.  Error is always negative and association id is
1353  * always positive.
1354  */
1355 static int sctp_setsockopt_connectx(struct sock *sk,
1356                                     struct sockaddr __user *addrs,
1357                                     int addrs_size)
1358 {
1359         sctp_assoc_t assoc_id = 0;
1360         int err = 0;
1361 
1362         err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1363 
1364         if (err)
1365                 return err;
1366         else
1367                 return assoc_id;
1368 }
1369 
1370 /*
1371  * New (hopefully final) interface for the API.
1372  * We use the sctp_getaddrs_old structure so that use-space library
1373  * can avoid any unnecessary allocations. The only different part
1374  * is that we store the actual length of the address buffer into the
1375  * addrs_num structure member. That way we can re-use the existing
1376  * code.
1377  */
1378 #ifdef CONFIG_COMPAT
1379 struct compat_sctp_getaddrs_old {
1380         sctp_assoc_t    assoc_id;
1381         s32             addr_num;
1382         compat_uptr_t   addrs;          /* struct sockaddr * */
1383 };
1384 #endif
1385 
1386 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1387                                      char __user *optval,
1388                                      int __user *optlen)
1389 {
1390         struct sctp_getaddrs_old param;
1391         sctp_assoc_t assoc_id = 0;
1392         int err = 0;
1393 
1394 #ifdef CONFIG_COMPAT
1395         if (is_compat_task()) {
1396                 struct compat_sctp_getaddrs_old param32;
1397 
1398                 if (len < sizeof(param32))
1399                         return -EINVAL;
1400                 if (copy_from_user(&param32, optval, sizeof(param32)))
1401                         return -EFAULT;
1402 
1403                 param.assoc_id = param32.assoc_id;
1404                 param.addr_num = param32.addr_num;
1405                 param.addrs = compat_ptr(param32.addrs);
1406         } else
1407 #endif
1408         {
1409                 if (len < sizeof(param))
1410                         return -EINVAL;
1411                 if (copy_from_user(&param, optval, sizeof(param)))
1412                         return -EFAULT;
1413         }
1414 
1415         err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1416                                          param.addrs, param.addr_num,
1417                                          &assoc_id);
1418         if (err == 0 || err == -EINPROGRESS) {
1419                 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1420                         return -EFAULT;
1421                 if (put_user(sizeof(assoc_id), optlen))
1422                         return -EFAULT;
1423         }
1424 
1425         return err;
1426 }
1427 
1428 /* API 3.1.4 close() - UDP Style Syntax
1429  * Applications use close() to perform graceful shutdown (as described in
1430  * Section 10.1 of [SCTP]) on ALL the associations currently represented
1431  * by a UDP-style socket.
1432  *
1433  * The syntax is
1434  *
1435  *   ret = close(int sd);
1436  *
1437  *   sd      - the socket descriptor of the associations to be closed.
1438  *
1439  * To gracefully shutdown a specific association represented by the
1440  * UDP-style socket, an application should use the sendmsg() call,
1441  * passing no user data, but including the appropriate flag in the
1442  * ancillary data (see Section xxxx).
1443  *
1444  * If sd in the close() call is a branched-off socket representing only
1445  * one association, the shutdown is performed on that association only.
1446  *
1447  * 4.1.6 close() - TCP Style Syntax
1448  *
1449  * Applications use close() to gracefully close down an association.
1450  *
1451  * The syntax is:
1452  *
1453  *    int close(int sd);
1454  *
1455  *      sd      - the socket descriptor of the association to be closed.
1456  *
1457  * After an application calls close() on a socket descriptor, no further
1458  * socket operations will succeed on that descriptor.
1459  *
1460  * API 7.1.4 SO_LINGER
1461  *
1462  * An application using the TCP-style socket can use this option to
1463  * perform the SCTP ABORT primitive.  The linger option structure is:
1464  *
1465  *  struct  linger {
1466  *     int     l_onoff;                // option on/off
1467  *     int     l_linger;               // linger time
1468  * };
1469  *
1470  * To enable the option, set l_onoff to 1.  If the l_linger value is set
1471  * to 0, calling close() is the same as the ABORT primitive.  If the
1472  * value is set to a negative value, the setsockopt() call will return
1473  * an error.  If the value is set to a positive value linger_time, the
1474  * close() can be blocked for at most linger_time ms.  If the graceful
1475  * shutdown phase does not finish during this period, close() will
1476  * return but the graceful shutdown phase continues in the system.
1477  */
1478 static void sctp_close(struct sock *sk, long timeout)
1479 {
1480         struct net *net = sock_net(sk);
1481         struct sctp_endpoint *ep;
1482         struct sctp_association *asoc;
1483         struct list_head *pos, *temp;
1484         unsigned int data_was_unread;
1485 
1486         pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1487 
1488         lock_sock(sk);
1489         sk->sk_shutdown = SHUTDOWN_MASK;
1490         sk->sk_state = SCTP_SS_CLOSING;
1491 
1492         ep = sctp_sk(sk)->ep;
1493 
1494         /* Clean up any skbs sitting on the receive queue.  */
1495         data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1496         data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1497 
1498         /* Walk all associations on an endpoint.  */
1499         list_for_each_safe(pos, temp, &ep->asocs) {
1500                 asoc = list_entry(pos, struct sctp_association, asocs);
1501 
1502                 if (sctp_style(sk, TCP)) {
1503                         /* A closed association can still be in the list if
1504                          * it belongs to a TCP-style listening socket that is
1505                          * not yet accepted. If so, free it. If not, send an
1506                          * ABORT or SHUTDOWN based on the linger options.
1507                          */
1508                         if (sctp_state(asoc, CLOSED)) {
1509                                 sctp_unhash_established(asoc);
1510                                 sctp_association_free(asoc);
1511                                 continue;
1512                         }
1513                 }
1514 
1515                 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1516                     !skb_queue_empty(&asoc->ulpq.reasm) ||
1517                     (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1518                         struct sctp_chunk *chunk;
1519 
1520                         chunk = sctp_make_abort_user(asoc, NULL, 0);
1521                         if (chunk)
1522                                 sctp_primitive_ABORT(net, asoc, chunk);
1523                 } else
1524                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
1525         }
1526 
1527         /* On a TCP-style socket, block for at most linger_time if set. */
1528         if (sctp_style(sk, TCP) && timeout)
1529                 sctp_wait_for_close(sk, timeout);
1530 
1531         /* This will run the backlog queue.  */
1532         release_sock(sk);
1533 
1534         /* Supposedly, no process has access to the socket, but
1535          * the net layers still may.
1536          */
1537         local_bh_disable();
1538         bh_lock_sock(sk);
1539 
1540         /* Hold the sock, since sk_common_release() will put sock_put()
1541          * and we have just a little more cleanup.
1542          */
1543         sock_hold(sk);
1544         sk_common_release(sk);
1545 
1546         bh_unlock_sock(sk);
1547         local_bh_enable();
1548 
1549         sock_put(sk);
1550 
1551         SCTP_DBG_OBJCNT_DEC(sock);
1552 }
1553 
1554 /* Handle EPIPE error. */
1555 static int sctp_error(struct sock *sk, int flags, int err)
1556 {
1557         if (err == -EPIPE)
1558                 err = sock_error(sk) ? : -EPIPE;
1559         if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1560                 send_sig(SIGPIPE, current, 0);
1561         return err;
1562 }
1563 
1564 /* API 3.1.3 sendmsg() - UDP Style Syntax
1565  *
1566  * An application uses sendmsg() and recvmsg() calls to transmit data to
1567  * and receive data from its peer.
1568  *
1569  *  ssize_t sendmsg(int socket, const struct msghdr *message,
1570  *                  int flags);
1571  *
1572  *  socket  - the socket descriptor of the endpoint.
1573  *  message - pointer to the msghdr structure which contains a single
1574  *            user message and possibly some ancillary data.
1575  *
1576  *            See Section 5 for complete description of the data
1577  *            structures.
1578  *
1579  *  flags   - flags sent or received with the user message, see Section
1580  *            5 for complete description of the flags.
1581  *
1582  * Note:  This function could use a rewrite especially when explicit
1583  * connect support comes in.
1584  */
1585 /* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1586 
1587 static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1588 
1589 static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1590                         struct msghdr *msg, size_t msg_len)
1591 {
1592         struct net *net = sock_net(sk);
1593         struct sctp_sock *sp;
1594         struct sctp_endpoint *ep;
1595         struct sctp_association *new_asoc = NULL, *asoc = NULL;
1596         struct sctp_transport *transport, *chunk_tp;
1597         struct sctp_chunk *chunk;
1598         union sctp_addr to;
1599         struct sockaddr *msg_name = NULL;
1600         struct sctp_sndrcvinfo default_sinfo;
1601         struct sctp_sndrcvinfo *sinfo;
1602         struct sctp_initmsg *sinit;
1603         sctp_assoc_t associd = 0;
1604         sctp_cmsgs_t cmsgs = { NULL };
1605         sctp_scope_t scope;
1606         bool fill_sinfo_ttl = false, wait_connect = false;
1607         struct sctp_datamsg *datamsg;
1608         int msg_flags = msg->msg_flags;
1609         __u16 sinfo_flags = 0;
1610         long timeo;
1611         int err;
1612 
1613         err = 0;
1614         sp = sctp_sk(sk);
1615         ep = sp->ep;
1616 
1617         pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk,
1618                  msg, msg_len, ep);
1619 
1620         /* We cannot send a message over a TCP-style listening socket. */
1621         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1622                 err = -EPIPE;
1623                 goto out_nounlock;
1624         }
1625 
1626         /* Parse out the SCTP CMSGs.  */
1627         err = sctp_msghdr_parse(msg, &cmsgs);
1628         if (err) {
1629                 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1630                 goto out_nounlock;
1631         }
1632 
1633         /* Fetch the destination address for this packet.  This
1634          * address only selects the association--it is not necessarily
1635          * the address we will send to.
1636          * For a peeled-off socket, msg_name is ignored.
1637          */
1638         if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1639                 int msg_namelen = msg->msg_namelen;
1640 
1641                 err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1642                                        msg_namelen);
1643                 if (err)
1644                         return err;
1645 
1646                 if (msg_namelen > sizeof(to))
1647                         msg_namelen = sizeof(to);
1648                 memcpy(&to, msg->msg_name, msg_namelen);
1649                 msg_name = msg->msg_name;
1650         }
1651 
1652         sinit = cmsgs.init;
1653         if (cmsgs.sinfo != NULL) {
1654                 memset(&default_sinfo, 0, sizeof(default_sinfo));
1655                 default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
1656                 default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
1657                 default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
1658                 default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
1659                 default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
1660 
1661                 sinfo = &default_sinfo;
1662                 fill_sinfo_ttl = true;
1663         } else {
1664                 sinfo = cmsgs.srinfo;
1665         }
1666         /* Did the user specify SNDINFO/SNDRCVINFO? */
1667         if (sinfo) {
1668                 sinfo_flags = sinfo->sinfo_flags;
1669                 associd = sinfo->sinfo_assoc_id;
1670         }
1671 
1672         pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__,
1673                  msg_len, sinfo_flags);
1674 
1675         /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1676         if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1677                 err = -EINVAL;
1678                 goto out_nounlock;
1679         }
1680 
1681         /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1682          * length messages when SCTP_EOF|SCTP_ABORT is not set.
1683          * If SCTP_ABORT is set, the message length could be non zero with
1684          * the msg_iov set to the user abort reason.
1685          */
1686         if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1687             (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1688                 err = -EINVAL;
1689                 goto out_nounlock;
1690         }
1691 
1692         /* If SCTP_ADDR_OVER is set, there must be an address
1693          * specified in msg_name.
1694          */
1695         if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1696                 err = -EINVAL;
1697                 goto out_nounlock;
1698         }
1699 
1700         transport = NULL;
1701 
1702         pr_debug("%s: about to look up association\n", __func__);
1703 
1704         lock_sock(sk);
1705 
1706         /* If a msg_name has been specified, assume this is to be used.  */
1707         if (msg_name) {
1708                 /* Look for a matching association on the endpoint. */
1709                 asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1710                 if (!asoc) {
1711                         /* If we could not find a matching association on the
1712                          * endpoint, make sure that it is not a TCP-style
1713                          * socket that already has an association or there is
1714                          * no peeled-off association on another socket.
1715                          */
1716                         if ((sctp_style(sk, TCP) &&
1717                              sctp_sstate(sk, ESTABLISHED)) ||
1718                             sctp_endpoint_is_peeled_off(ep, &to)) {
1719                                 err = -EADDRNOTAVAIL;
1720                                 goto out_unlock;
1721                         }
1722                 }
1723         } else {
1724                 asoc = sctp_id2assoc(sk, associd);
1725                 if (!asoc) {
1726                         err = -EPIPE;
1727                         goto out_unlock;
1728                 }
1729         }
1730 
1731         if (asoc) {
1732                 pr_debug("%s: just looked up association:%p\n", __func__, asoc);
1733 
1734                 /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1735                  * socket that has an association in CLOSED state. This can
1736                  * happen when an accepted socket has an association that is
1737                  * already CLOSED.
1738                  */
1739                 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1740                         err = -EPIPE;
1741                         goto out_unlock;
1742                 }
1743 
1744                 if (sinfo_flags & SCTP_EOF) {
1745                         pr_debug("%s: shutting down association:%p\n",
1746                                  __func__, asoc);
1747 
1748                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
1749                         err = 0;
1750                         goto out_unlock;
1751                 }
1752                 if (sinfo_flags & SCTP_ABORT) {
1753 
1754                         chunk = sctp_make_abort_user(asoc, msg, msg_len);
1755                         if (!chunk) {
1756                                 err = -ENOMEM;
1757                                 goto out_unlock;
1758                         }
1759 
1760                         pr_debug("%s: aborting association:%p\n",
1761                                  __func__, asoc);
1762 
1763                         sctp_primitive_ABORT(net, asoc, chunk);
1764                         err = 0;
1765                         goto out_unlock;
1766                 }
1767         }
1768 
1769         /* Do we need to create the association?  */
1770         if (!asoc) {
1771                 pr_debug("%s: there is no association yet\n", __func__);
1772 
1773                 if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1774                         err = -EINVAL;
1775                         goto out_unlock;
1776                 }
1777 
1778                 /* Check for invalid stream against the stream counts,
1779                  * either the default or the user specified stream counts.
1780                  */
1781                 if (sinfo) {
1782                         if (!sinit || !sinit->sinit_num_ostreams) {
1783                                 /* Check against the defaults. */
1784                                 if (sinfo->sinfo_stream >=
1785                                     sp->initmsg.sinit_num_ostreams) {
1786                                         err = -EINVAL;
1787                                         goto out_unlock;
1788                                 }
1789                         } else {
1790                                 /* Check against the requested.  */
1791                                 if (sinfo->sinfo_stream >=
1792                                     sinit->sinit_num_ostreams) {
1793                                         err = -EINVAL;
1794                                         goto out_unlock;
1795                                 }
1796                         }
1797                 }
1798 
1799                 /*
1800                  * API 3.1.2 bind() - UDP Style Syntax
1801                  * If a bind() or sctp_bindx() is not called prior to a
1802                  * sendmsg() call that initiates a new association, the
1803                  * system picks an ephemeral port and will choose an address
1804                  * set equivalent to binding with a wildcard address.
1805                  */
1806                 if (!ep->base.bind_addr.port) {
1807                         if (sctp_autobind(sk)) {
1808                                 err = -EAGAIN;
1809                                 goto out_unlock;
1810                         }
1811                 } else {
1812                         /*
1813                          * If an unprivileged user inherits a one-to-many
1814                          * style socket with open associations on a privileged
1815                          * port, it MAY be permitted to accept new associations,
1816                          * but it SHOULD NOT be permitted to open new
1817                          * associations.
1818                          */
1819                         if (ep->base.bind_addr.port < PROT_SOCK &&
1820                             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1821                                 err = -EACCES;
1822                                 goto out_unlock;
1823                         }
1824                 }
1825 
1826                 scope = sctp_scope(&to);
1827                 new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1828                 if (!new_asoc) {
1829                         err = -ENOMEM;
1830                         goto out_unlock;
1831                 }
1832                 asoc = new_asoc;
1833                 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1834                 if (err < 0) {
1835                         err = -ENOMEM;
1836                         goto out_free;
1837                 }
1838 
1839                 /* If the SCTP_INIT ancillary data is specified, set all
1840                  * the association init values accordingly.
1841                  */
1842                 if (sinit) {
1843                         if (sinit->sinit_num_ostreams) {
1844                                 asoc->c.sinit_num_ostreams =
1845                                         sinit->sinit_num_ostreams;
1846                         }
1847                         if (sinit->sinit_max_instreams) {
1848                                 asoc->c.sinit_max_instreams =
1849                                         sinit->sinit_max_instreams;
1850                         }
1851                         if (sinit->sinit_max_attempts) {
1852                                 asoc->max_init_attempts
1853                                         = sinit->sinit_max_attempts;
1854                         }
1855                         if (sinit->sinit_max_init_timeo) {
1856                                 asoc->max_init_timeo =
1857                                  msecs_to_jiffies(sinit->sinit_max_init_timeo);
1858                         }
1859                 }
1860 
1861                 /* Prime the peer's transport structures.  */
1862                 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1863                 if (!transport) {
1864                         err = -ENOMEM;
1865                         goto out_free;
1866                 }
1867         }
1868 
1869         /* ASSERT: we have a valid association at this point.  */
1870         pr_debug("%s: we have a valid association\n", __func__);
1871 
1872         if (!sinfo) {
1873                 /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
1874                  * one with some defaults.
1875                  */
1876                 memset(&default_sinfo, 0, sizeof(default_sinfo));
1877                 default_sinfo.sinfo_stream = asoc->default_stream;
1878                 default_sinfo.sinfo_flags = asoc->default_flags;
1879                 default_sinfo.sinfo_ppid = asoc->default_ppid;
1880                 default_sinfo.sinfo_context = asoc->default_context;
1881                 default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1882                 default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1883 
1884                 sinfo = &default_sinfo;
1885         } else if (fill_sinfo_ttl) {
1886                 /* In case SNDINFO was specified, we still need to fill
1887                  * it with a default ttl from the assoc here.
1888                  */
1889                 sinfo->sinfo_timetolive = asoc->default_timetolive;
1890         }
1891 
1892         /* API 7.1.7, the sndbuf size per association bounds the
1893          * maximum size of data that can be sent in a single send call.
1894          */
1895         if (msg_len > sk->sk_sndbuf) {
1896                 err = -EMSGSIZE;
1897                 goto out_free;
1898         }
1899 
1900         if (asoc->pmtu_pending)
1901                 sctp_assoc_pending_pmtu(sk, asoc);
1902 
1903         /* If fragmentation is disabled and the message length exceeds the
1904          * association fragmentation point, return EMSGSIZE.  The I-D
1905          * does not specify what this error is, but this looks like
1906          * a great fit.
1907          */
1908         if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1909                 err = -EMSGSIZE;
1910                 goto out_free;
1911         }
1912 
1913         /* Check for invalid stream. */
1914         if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1915                 err = -EINVAL;
1916                 goto out_free;
1917         }
1918 
1919         timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1920         if (!sctp_wspace(asoc)) {
1921                 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1922                 if (err)
1923                         goto out_free;
1924         }
1925 
1926         /* If an address is passed with the sendto/sendmsg call, it is used
1927          * to override the primary destination address in the TCP model, or
1928          * when SCTP_ADDR_OVER flag is set in the UDP model.
1929          */
1930         if ((sctp_style(sk, TCP) && msg_name) ||
1931             (sinfo_flags & SCTP_ADDR_OVER)) {
1932                 chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1933                 if (!chunk_tp) {
1934                         err = -EINVAL;
1935                         goto out_free;
1936                 }
1937         } else
1938                 chunk_tp = NULL;
1939 
1940         /* Auto-connect, if we aren't connected already. */
1941         if (sctp_state(asoc, CLOSED)) {
1942                 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1943                 if (err < 0)
1944                         goto out_free;
1945 
1946                 wait_connect = true;
1947                 pr_debug("%s: we associated primitively\n", __func__);
1948         }
1949 
1950         /* Break the message into multiple chunks of maximum size. */
1951         datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1952         if (IS_ERR(datamsg)) {
1953                 err = PTR_ERR(datamsg);
1954                 goto out_free;
1955         }
1956 
1957         /* Now send the (possibly) fragmented message. */
1958         list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1959                 sctp_chunk_hold(chunk);
1960 
1961                 /* Do accounting for the write space.  */
1962                 sctp_set_owner_w(chunk);
1963 
1964                 chunk->transport = chunk_tp;
1965         }
1966 
1967         /* Send it to the lower layers.  Note:  all chunks
1968          * must either fail or succeed.   The lower layer
1969          * works that way today.  Keep it that way or this
1970          * breaks.
1971          */
1972         err = sctp_primitive_SEND(net, asoc, datamsg);
1973         /* Did the lower layer accept the chunk? */
1974         if (err) {
1975                 sctp_datamsg_free(datamsg);
1976                 goto out_free;
1977         }
1978 
1979         pr_debug("%s: we sent primitively\n", __func__);
1980 
1981         sctp_datamsg_put(datamsg);
1982         err = msg_len;
1983 
1984         if (unlikely(wait_connect)) {
1985                 timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
1986                 sctp_wait_for_connect(asoc, &timeo);
1987         }
1988 
1989         /* If we are already past ASSOCIATE, the lower
1990          * layers are responsible for association cleanup.
1991          */
1992         goto out_unlock;
1993 
1994 out_free:
1995         if (new_asoc) {
1996                 sctp_unhash_established(asoc);
1997                 sctp_association_free(asoc);
1998         }
1999 out_unlock:
2000         release_sock(sk);
2001 
2002 out_nounlock:
2003         return sctp_error(sk, msg_flags, err);
2004 
2005 #if 0
2006 do_sock_err:
2007         if (msg_len)
2008                 err = msg_len;
2009         else
2010                 err = sock_error(sk);
2011         goto out;
2012 
2013 do_interrupted:
2014         if (msg_len)
2015                 err = msg_len;
2016         goto out;
2017 #endif /* 0 */
2018 }
2019 
2020 /* This is an extended version of skb_pull() that removes the data from the
2021  * start of a skb even when data is spread across the list of skb's in the
2022  * frag_list. len specifies the total amount of data that needs to be removed.
2023  * when 'len' bytes could be removed from the skb, it returns 0.
2024  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2025  * could not be removed.
2026  */
2027 static int sctp_skb_pull(struct sk_buff *skb, int len)
2028 {
2029         struct sk_buff *list;
2030         int skb_len = skb_headlen(skb);
2031         int rlen;
2032 
2033         if (len <= skb_len) {
2034                 __skb_pull(skb, len);
2035                 return 0;
2036         }
2037         len -= skb_len;
2038         __skb_pull(skb, skb_len);
2039 
2040         skb_walk_frags(skb, list) {
2041                 rlen = sctp_skb_pull(list, len);
2042                 skb->len -= (len-rlen);
2043                 skb->data_len -= (len-rlen);
2044 
2045                 if (!rlen)
2046                         return 0;
2047 
2048                 len = rlen;
2049         }
2050 
2051         return len;
2052 }
2053 
2054 /* API 3.1.3  recvmsg() - UDP Style Syntax
2055  *
2056  *  ssize_t recvmsg(int socket, struct msghdr *message,
2057  *                    int flags);
2058  *
2059  *  socket  - the socket descriptor of the endpoint.
2060  *  message - pointer to the msghdr structure which contains a single
2061  *            user message and possibly some ancillary data.
2062  *
2063  *            See Section 5 for complete description of the data
2064  *            structures.
2065  *
2066  *  flags   - flags sent or received with the user message, see Section
2067  *            5 for complete description of the flags.
2068  */
2069 static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2070                         struct msghdr *msg, size_t len, int noblock,
2071                         int flags, int *addr_len)
2072 {
2073         struct sctp_ulpevent *event = NULL;
2074         struct sctp_sock *sp = sctp_sk(sk);
2075         struct sk_buff *skb;
2076         int copied;
2077         int err = 0;
2078         int skb_len;
2079 
2080         pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2081                  "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2082                  addr_len);
2083 
2084         lock_sock(sk);
2085 
2086         if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2087                 err = -ENOTCONN;
2088                 goto out;
2089         }
2090 
2091         skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2092         if (!skb)
2093                 goto out;
2094 
2095         /* Get the total length of the skb including any skb's in the
2096          * frag_list.
2097          */
2098         skb_len = skb->len;
2099 
2100         copied = skb_len;
2101         if (copied > len)
2102                 copied = len;
2103 
2104         err = skb_copy_datagram_msg(skb, 0, msg, copied);
2105 
2106         event = sctp_skb2event(skb);
2107 
2108         if (err)
2109                 goto out_free;
2110 
2111         sock_recv_ts_and_drops(msg, sk, skb);
2112         if (sctp_ulpevent_is_notification(event)) {
2113                 msg->msg_flags |= MSG_NOTIFICATION;
2114                 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2115         } else {
2116                 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2117         }
2118 
2119         /* Check if we allow SCTP_NXTINFO. */
2120         if (sp->recvnxtinfo)
2121                 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2122         /* Check if we allow SCTP_RCVINFO. */
2123         if (sp->recvrcvinfo)
2124                 sctp_ulpevent_read_rcvinfo(event, msg);
2125         /* Check if we allow SCTP_SNDRCVINFO. */
2126         if (sp->subscribe.sctp_data_io_event)
2127                 sctp_ulpevent_read_sndrcvinfo(event, msg);
2128 
2129 #if 0
2130         /* FIXME: we should be calling IP/IPv6 layers.  */
2131         if (sk->sk_protinfo.af_inet.cmsg_flags)
2132                 ip_cmsg_recv(msg, skb);
2133 #endif
2134 
2135         err = copied;
2136 
2137         /* If skb's length exceeds the user's buffer, update the skb and
2138          * push it back to the receive_queue so that the next call to
2139          * recvmsg() will return the remaining data. Don't set MSG_EOR.
2140          */
2141         if (skb_len > copied) {
2142                 msg->msg_flags &= ~MSG_EOR;
2143                 if (flags & MSG_PEEK)
2144                         goto out_free;
2145                 sctp_skb_pull(skb, copied);
2146                 skb_queue_head(&sk->sk_receive_queue, skb);
2147 
2148                 /* When only partial message is copied to the user, increase
2149                  * rwnd by that amount. If all the data in the skb is read,
2150                  * rwnd is updated when the event is freed.
2151                  */
2152                 if (!sctp_ulpevent_is_notification(event))
2153                         sctp_assoc_rwnd_increase(event->asoc, copied);
2154                 goto out;
2155         } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2156                    (event->msg_flags & MSG_EOR))
2157                 msg->msg_flags |= MSG_EOR;
2158         else
2159                 msg->msg_flags &= ~MSG_EOR;
2160 
2161 out_free:
2162         if (flags & MSG_PEEK) {
2163                 /* Release the skb reference acquired after peeking the skb in
2164                  * sctp_skb_recv_datagram().
2165                  */
2166                 kfree_skb(skb);
2167         } else {
2168                 /* Free the event which includes releasing the reference to
2169                  * the owner of the skb, freeing the skb and updating the
2170                  * rwnd.
2171                  */
2172                 sctp_ulpevent_free(event);
2173         }
2174 out:
2175         release_sock(sk);
2176         return err;
2177 }
2178 
2179 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2180  *
2181  * This option is a on/off flag.  If enabled no SCTP message
2182  * fragmentation will be performed.  Instead if a message being sent
2183  * exceeds the current PMTU size, the message will NOT be sent and
2184  * instead a error will be indicated to the user.
2185  */
2186 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2187                                              char __user *optval,
2188                                              unsigned int optlen)
2189 {
2190         int val;
2191 
2192         if (optlen < sizeof(int))
2193                 return -EINVAL;
2194 
2195         if (get_user(val, (int __user *)optval))
2196                 return -EFAULT;
2197 
2198         sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2199 
2200         return 0;
2201 }
2202 
2203 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2204                                   unsigned int optlen)
2205 {
2206         struct sctp_association *asoc;
2207         struct sctp_ulpevent *event;
2208 
2209         if (optlen > sizeof(struct sctp_event_subscribe))
2210                 return -EINVAL;
2211         if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2212                 return -EFAULT;
2213 
2214         if (sctp_sk(sk)->subscribe.sctp_data_io_event)
2215                 pr_warn_ratelimited(DEPRECATED "%s (pid %d) "
2216                                     "Requested SCTP_SNDRCVINFO event.\n"
2217                                     "Use SCTP_RCVINFO through SCTP_RECVRCVINFO option instead.\n",
2218                                     current->comm, task_pid_nr(current));
2219 
2220         /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2221          * if there is no data to be sent or retransmit, the stack will
2222          * immediately send up this notification.
2223          */
2224         if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2225                                        &sctp_sk(sk)->subscribe)) {
2226                 asoc = sctp_id2assoc(sk, 0);
2227 
2228                 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2229                         event = sctp_ulpevent_make_sender_dry_event(asoc,
2230                                         GFP_ATOMIC);
2231                         if (!event)
2232                                 return -ENOMEM;
2233 
2234                         sctp_ulpq_tail_event(&asoc->ulpq, event);
2235                 }
2236         }
2237 
2238         return 0;
2239 }
2240 
2241 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2242  *
2243  * This socket option is applicable to the UDP-style socket only.  When
2244  * set it will cause associations that are idle for more than the
2245  * specified number of seconds to automatically close.  An association
2246  * being idle is defined an association that has NOT sent or received
2247  * user data.  The special value of '' indicates that no automatic
2248  * close of any associations should be performed.  The option expects an
2249  * integer defining the number of seconds of idle time before an
2250  * association is closed.
2251  */
2252 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2253                                      unsigned int optlen)
2254 {
2255         struct sctp_sock *sp = sctp_sk(sk);
2256         struct net *net = sock_net(sk);
2257 
2258         /* Applicable to UDP-style socket only */
2259         if (sctp_style(sk, TCP))
2260                 return -EOPNOTSUPP;
2261         if (optlen != sizeof(int))
2262                 return -EINVAL;
2263         if (copy_from_user(&sp->autoclose, optval, optlen))
2264                 return -EFAULT;
2265 
2266         if (sp->autoclose > net->sctp.max_autoclose)
2267                 sp->autoclose = net->sctp.max_autoclose;
2268 
2269         return 0;
2270 }
2271 
2272 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2273  *
2274  * Applications can enable or disable heartbeats for any peer address of
2275  * an association, modify an address's heartbeat interval, force a
2276  * heartbeat to be sent immediately, and adjust the address's maximum
2277  * number of retransmissions sent before an address is considered
2278  * unreachable.  The following structure is used to access and modify an
2279  * address's parameters:
2280  *
2281  *  struct sctp_paddrparams {
2282  *     sctp_assoc_t            spp_assoc_id;
2283  *     struct sockaddr_storage spp_address;
2284  *     uint32_t                spp_hbinterval;
2285  *     uint16_t                spp_pathmaxrxt;
2286  *     uint32_t                spp_pathmtu;
2287  *     uint32_t                spp_sackdelay;
2288  *     uint32_t                spp_flags;
2289  * };
2290  *
2291  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2292  *                     application, and identifies the association for
2293  *                     this query.
2294  *   spp_address     - This specifies which address is of interest.
2295  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2296  *                     in milliseconds.  If a  value of zero
2297  *                     is present in this field then no changes are to
2298  *                     be made to this parameter.
2299  *   spp_pathmaxrxt  - This contains the maximum number of
2300  *                     retransmissions before this address shall be
2301  *                     considered unreachable. If a  value of zero
2302  *                     is present in this field then no changes are to
2303  *                     be made to this parameter.
2304  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2305  *                     specified here will be the "fixed" path mtu.
2306  *                     Note that if the spp_address field is empty
2307  *                     then all associations on this address will
2308  *                     have this fixed path mtu set upon them.
2309  *
2310  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2311  *                     the number of milliseconds that sacks will be delayed
2312  *                     for. This value will apply to all addresses of an
2313  *                     association if the spp_address field is empty. Note
2314  *                     also, that if delayed sack is enabled and this
2315  *                     value is set to 0, no change is made to the last
2316  *                     recorded delayed sack timer value.
2317  *
2318  *   spp_flags       - These flags are used to control various features
2319  *                     on an association. The flag field may contain
2320  *                     zero or more of the following options.
2321  *
2322  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2323  *                     specified address. Note that if the address
2324  *                     field is empty all addresses for the association
2325  *                     have heartbeats enabled upon them.
2326  *
2327  *                     SPP_HB_DISABLE - Disable heartbeats on the
2328  *                     speicifed address. Note that if the address
2329  *                     field is empty all addresses for the association
2330  *                     will have their heartbeats disabled. Note also
2331  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2332  *                     mutually exclusive, only one of these two should
2333  *                     be specified. Enabling both fields will have
2334  *                     undetermined results.
2335  *
2336  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2337  *                     to be made immediately.
2338  *
2339  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2340  *                     heartbeat delayis to be set to the value of 0
2341  *                     milliseconds.
2342  *
2343  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2344  *                     discovery upon the specified address. Note that
2345  *                     if the address feild is empty then all addresses
2346  *                     on the association are effected.
2347  *
2348  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2349  *                     discovery upon the specified address. Note that
2350  *                     if the address feild is empty then all addresses
2351  *                     on the association are effected. Not also that
2352  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2353  *                     exclusive. Enabling both will have undetermined
2354  *                     results.
2355  *
2356  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2357  *                     on delayed sack. The time specified in spp_sackdelay
2358  *                     is used to specify the sack delay for this address. Note
2359  *                     that if spp_address is empty then all addresses will
2360  *                     enable delayed sack and take on the sack delay
2361  *                     value specified in spp_sackdelay.
2362  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2363  *                     off delayed sack. If the spp_address field is blank then
2364  *                     delayed sack is disabled for the entire association. Note
2365  *                     also that this field is mutually exclusive to
2366  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2367  *                     results.
2368  */
2369 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2370                                        struct sctp_transport   *trans,
2371                                        struct sctp_association *asoc,
2372                                        struct sctp_sock        *sp,
2373                                        int                      hb_change,
2374                                        int                      pmtud_change,
2375                                        int                      sackdelay_change)
2376 {
2377         int error;
2378 
2379         if (params->spp_flags & SPP_HB_DEMAND && trans) {
2380                 struct net *net = sock_net(trans->asoc->base.sk);
2381 
2382                 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2383                 if (error)
2384                         return error;
2385         }
2386 
2387         /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2388          * this field is ignored.  Note also that a value of zero indicates
2389          * the current setting should be left unchanged.
2390          */
2391         if (params->spp_flags & SPP_HB_ENABLE) {
2392 
2393                 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2394                  * set.  This lets us use 0 value when this flag
2395                  * is set.
2396                  */
2397                 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2398                         params->spp_hbinterval = 0;
2399 
2400                 if (params->spp_hbinterval ||
2401                     (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2402                         if (trans) {
2403                                 trans->hbinterval =
2404                                     msecs_to_jiffies(params->spp_hbinterval);
2405                         } else if (asoc) {
2406                                 asoc->hbinterval =
2407                                     msecs_to_jiffies(params->spp_hbinterval);
2408                         } else {
2409                                 sp->hbinterval = params->spp_hbinterval;
2410                         }
2411                 }
2412         }
2413 
2414         if (hb_change) {
2415                 if (trans) {
2416                         trans->param_flags =
2417                                 (trans->param_flags & ~SPP_HB) | hb_change;
2418                 } else if (asoc) {
2419                         asoc->param_flags =
2420                                 (asoc->param_flags & ~SPP_HB) | hb_change;
2421                 } else {
2422                         sp->param_flags =
2423                                 (sp->param_flags & ~SPP_HB) | hb_change;
2424                 }
2425         }
2426 
2427         /* When Path MTU discovery is disabled the value specified here will
2428          * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2429          * include the flag SPP_PMTUD_DISABLE for this field to have any
2430          * effect).
2431          */
2432         if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2433                 if (trans) {
2434                         trans->pathmtu = params->spp_pathmtu;
2435                         sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2436                 } else if (asoc) {
2437                         asoc->pathmtu = params->spp_pathmtu;
2438                         sctp_frag_point(asoc, params->spp_pathmtu);
2439                 } else {
2440                         sp->pathmtu = params->spp_pathmtu;
2441                 }
2442         }
2443 
2444         if (pmtud_change) {
2445                 if (trans) {
2446                         int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2447                                 (params->spp_flags & SPP_PMTUD_ENABLE);
2448                         trans->param_flags =
2449                                 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2450                         if (update) {
2451                                 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2452                                 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2453                         }
2454                 } else if (asoc) {
2455                         asoc->param_flags =
2456                                 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2457                 } else {
2458                         sp->param_flags =
2459                                 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2460                 }
2461         }
2462 
2463         /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2464          * value of this field is ignored.  Note also that a value of zero
2465          * indicates the current setting should be left unchanged.
2466          */
2467         if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2468                 if (trans) {
2469                         trans->sackdelay =
2470                                 msecs_to_jiffies(params->spp_sackdelay);
2471                 } else if (asoc) {
2472                         asoc->sackdelay =
2473                                 msecs_to_jiffies(params->spp_sackdelay);
2474                 } else {
2475                         sp->sackdelay = params->spp_sackdelay;
2476                 }
2477         }
2478 
2479         if (sackdelay_change) {
2480                 if (trans) {
2481                         trans->param_flags =
2482                                 (trans->param_flags & ~SPP_SACKDELAY) |
2483                                 sackdelay_change;
2484                 } else if (asoc) {
2485                         asoc->param_flags =
2486                                 (asoc->param_flags & ~SPP_SACKDELAY) |
2487                                 sackdelay_change;
2488                 } else {
2489                         sp->param_flags =
2490                                 (sp->param_flags & ~SPP_SACKDELAY) |
2491                                 sackdelay_change;
2492                 }
2493         }
2494 
2495         /* Note that a value of zero indicates the current setting should be
2496            left unchanged.
2497          */
2498         if (params->spp_pathmaxrxt) {
2499                 if (trans) {
2500                         trans->pathmaxrxt = params->spp_pathmaxrxt;
2501                 } else if (asoc) {
2502                         asoc->pathmaxrxt = params->spp_pathmaxrxt;
2503                 } else {
2504                         sp->pathmaxrxt = params->spp_pathmaxrxt;
2505                 }
2506         }
2507 
2508         return 0;
2509 }
2510 
2511 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2512                                             char __user *optval,
2513                                             unsigned int optlen)
2514 {
2515         struct sctp_paddrparams  params;
2516         struct sctp_transport   *trans = NULL;
2517         struct sctp_association *asoc = NULL;
2518         struct sctp_sock        *sp = sctp_sk(sk);
2519         int error;
2520         int hb_change, pmtud_change, sackdelay_change;
2521 
2522         if (optlen != sizeof(struct sctp_paddrparams))
2523                 return -EINVAL;
2524 
2525         if (copy_from_user(&params, optval, optlen))
2526                 return -EFAULT;
2527 
2528         /* Validate flags and value parameters. */
2529         hb_change        = params.spp_flags & SPP_HB;
2530         pmtud_change     = params.spp_flags & SPP_PMTUD;
2531         sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2532 
2533         if (hb_change        == SPP_HB ||
2534             pmtud_change     == SPP_PMTUD ||
2535             sackdelay_change == SPP_SACKDELAY ||
2536             params.spp_sackdelay > 500 ||
2537             (params.spp_pathmtu &&
2538              params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2539                 return -EINVAL;
2540 
2541         /* If an address other than INADDR_ANY is specified, and
2542          * no transport is found, then the request is invalid.
2543          */
2544         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2545                 trans = sctp_addr_id2transport(sk, &params.spp_address,
2546                                                params.spp_assoc_id);
2547                 if (!trans)
2548                         return -EINVAL;
2549         }
2550 
2551         /* Get association, if assoc_id != 0 and the socket is a one
2552          * to many style socket, and an association was not found, then
2553          * the id was invalid.
2554          */
2555         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2556         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2557                 return -EINVAL;
2558 
2559         /* Heartbeat demand can only be sent on a transport or
2560          * association, but not a socket.
2561          */
2562         if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2563                 return -EINVAL;
2564 
2565         /* Process parameters. */
2566         error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2567                                             hb_change, pmtud_change,
2568                                             sackdelay_change);
2569 
2570         if (error)
2571                 return error;
2572 
2573         /* If changes are for association, also apply parameters to each
2574          * transport.
2575          */
2576         if (!trans && asoc) {
2577                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2578                                 transports) {
2579                         sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2580                                                     hb_change, pmtud_change,
2581                                                     sackdelay_change);
2582                 }
2583         }
2584 
2585         return 0;
2586 }
2587 
2588 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2589 {
2590         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2591 }
2592 
2593 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2594 {
2595         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2596 }
2597 
2598 /*
2599  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2600  *
2601  * This option will effect the way delayed acks are performed.  This
2602  * option allows you to get or set the delayed ack time, in
2603  * milliseconds.  It also allows changing the delayed ack frequency.
2604  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2605  * the assoc_id is 0, then this sets or gets the endpoints default
2606  * values.  If the assoc_id field is non-zero, then the set or get
2607  * effects the specified association for the one to many model (the
2608  * assoc_id field is ignored by the one to one model).  Note that if
2609  * sack_delay or sack_freq are 0 when setting this option, then the
2610  * current values will remain unchanged.
2611  *
2612  * struct sctp_sack_info {
2613  *     sctp_assoc_t            sack_assoc_id;
2614  *     uint32_t                sack_delay;
2615  *     uint32_t                sack_freq;
2616  * };
2617  *
2618  * sack_assoc_id -  This parameter, indicates which association the user
2619  *    is performing an action upon.  Note that if this field's value is
2620  *    zero then the endpoints default value is changed (effecting future
2621  *    associations only).
2622  *
2623  * sack_delay -  This parameter contains the number of milliseconds that
2624  *    the user is requesting the delayed ACK timer be set to.  Note that
2625  *    this value is defined in the standard to be between 200 and 500
2626  *    milliseconds.
2627  *
2628  * sack_freq -  This parameter contains the number of packets that must
2629  *    be received before a sack is sent without waiting for the delay
2630  *    timer to expire.  The default value for this is 2, setting this
2631  *    value to 1 will disable the delayed sack algorithm.
2632  */
2633 
2634 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2635                                        char __user *optval, unsigned int optlen)
2636 {
2637         struct sctp_sack_info    params;
2638         struct sctp_transport   *trans = NULL;
2639         struct sctp_association *asoc = NULL;
2640         struct sctp_sock        *sp = sctp_sk(sk);
2641 
2642         if (optlen == sizeof(struct sctp_sack_info)) {
2643                 if (copy_from_user(&params, optval, optlen))
2644                         return -EFAULT;
2645 
2646                 if (params.sack_delay == 0 && params.sack_freq == 0)
2647                         return 0;
2648         } else if (optlen == sizeof(struct sctp_assoc_value)) {
2649                 pr_warn_ratelimited(DEPRECATED
2650                                     "%s (pid %d) "
2651                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2652                                     "Use struct sctp_sack_info instead\n",
2653                                     current->comm, task_pid_nr(current));
2654                 if (copy_from_user(&params, optval, optlen))
2655                         return -EFAULT;
2656 
2657                 if (params.sack_delay == 0)
2658                         params.sack_freq = 1;
2659                 else
2660                         params.sack_freq = 0;
2661         } else
2662                 return -EINVAL;
2663 
2664         /* Validate value parameter. */
2665         if (params.sack_delay > 500)
2666                 return -EINVAL;
2667 
2668         /* Get association, if sack_assoc_id != 0 and the socket is a one
2669          * to many style socket, and an association was not found, then
2670          * the id was invalid.
2671          */
2672         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2673         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2674                 return -EINVAL;
2675 
2676         if (params.sack_delay) {
2677                 if (asoc) {
2678                         asoc->sackdelay =
2679                                 msecs_to_jiffies(params.sack_delay);
2680                         asoc->param_flags =
2681                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2682                 } else {
2683                         sp->sackdelay = params.sack_delay;
2684                         sp->param_flags =
2685                                 sctp_spp_sackdelay_enable(sp->param_flags);
2686                 }
2687         }
2688 
2689         if (params.sack_freq == 1) {
2690                 if (asoc) {
2691                         asoc->param_flags =
2692                                 sctp_spp_sackdelay_disable(asoc->param_flags);
2693                 } else {
2694                         sp->param_flags =
2695                                 sctp_spp_sackdelay_disable(sp->param_flags);
2696                 }
2697         } else if (params.sack_freq > 1) {
2698                 if (asoc) {
2699                         asoc->sackfreq = params.sack_freq;
2700                         asoc->param_flags =
2701                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2702                 } else {
2703                         sp->sackfreq = params.sack_freq;
2704                         sp->param_flags =
2705                                 sctp_spp_sackdelay_enable(sp->param_flags);
2706                 }
2707         }
2708 
2709         /* If change is for association, also apply to each transport. */
2710         if (asoc) {
2711                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2712                                 transports) {
2713                         if (params.sack_delay) {
2714                                 trans->sackdelay =
2715                                         msecs_to_jiffies(params.sack_delay);
2716                                 trans->param_flags =
2717                                         sctp_spp_sackdelay_enable(trans->param_flags);
2718                         }
2719                         if (params.sack_freq == 1) {
2720                                 trans->param_flags =
2721                                         sctp_spp_sackdelay_disable(trans->param_flags);
2722                         } else if (params.sack_freq > 1) {
2723                                 trans->sackfreq = params.sack_freq;
2724                                 trans->param_flags =
2725                                         sctp_spp_sackdelay_enable(trans->param_flags);
2726                         }
2727                 }
2728         }
2729 
2730         return 0;
2731 }
2732 
2733 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2734  *
2735  * Applications can specify protocol parameters for the default association
2736  * initialization.  The option name argument to setsockopt() and getsockopt()
2737  * is SCTP_INITMSG.
2738  *
2739  * Setting initialization parameters is effective only on an unconnected
2740  * socket (for UDP-style sockets only future associations are effected
2741  * by the change).  With TCP-style sockets, this option is inherited by
2742  * sockets derived from a listener socket.
2743  */
2744 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2745 {
2746         struct sctp_initmsg sinit;
2747         struct sctp_sock *sp = sctp_sk(sk);
2748 
2749         if (optlen != sizeof(struct sctp_initmsg))
2750                 return -EINVAL;
2751         if (copy_from_user(&sinit, optval, optlen))
2752                 return -EFAULT;
2753 
2754         if (sinit.sinit_num_ostreams)
2755                 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2756         if (sinit.sinit_max_instreams)
2757                 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2758         if (sinit.sinit_max_attempts)
2759                 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2760         if (sinit.sinit_max_init_timeo)
2761                 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2762 
2763         return 0;
2764 }
2765 
2766 /*
2767  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2768  *
2769  *   Applications that wish to use the sendto() system call may wish to
2770  *   specify a default set of parameters that would normally be supplied
2771  *   through the inclusion of ancillary data.  This socket option allows
2772  *   such an application to set the default sctp_sndrcvinfo structure.
2773  *   The application that wishes to use this socket option simply passes
2774  *   in to this call the sctp_sndrcvinfo structure defined in Section
2775  *   5.2.2) The input parameters accepted by this call include
2776  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2777  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2778  *   to this call if the caller is using the UDP model.
2779  */
2780 static int sctp_setsockopt_default_send_param(struct sock *sk,
2781                                               char __user *optval,
2782                                               unsigned int optlen)
2783 {
2784         struct sctp_sock *sp = sctp_sk(sk);
2785         struct sctp_association *asoc;
2786         struct sctp_sndrcvinfo info;
2787 
2788         if (optlen != sizeof(info))
2789                 return -EINVAL;
2790         if (copy_from_user(&info, optval, optlen))
2791                 return -EFAULT;
2792         if (info.sinfo_flags &
2793             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2794               SCTP_ABORT | SCTP_EOF))
2795                 return -EINVAL;
2796 
2797         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2798         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2799                 return -EINVAL;
2800         if (asoc) {
2801                 asoc->default_stream = info.sinfo_stream;
2802                 asoc->default_flags = info.sinfo_flags;
2803                 asoc->default_ppid = info.sinfo_ppid;
2804                 asoc->default_context = info.sinfo_context;
2805                 asoc->default_timetolive = info.sinfo_timetolive;
2806         } else {
2807                 sp->default_stream = info.sinfo_stream;
2808                 sp->default_flags = info.sinfo_flags;
2809                 sp->default_ppid = info.sinfo_ppid;
2810                 sp->default_context = info.sinfo_context;
2811                 sp->default_timetolive = info.sinfo_timetolive;
2812         }
2813 
2814         return 0;
2815 }
2816 
2817 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2818  * (SCTP_DEFAULT_SNDINFO)
2819  */
2820 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2821                                            char __user *optval,
2822                                            unsigned int optlen)
2823 {
2824         struct sctp_sock *sp = sctp_sk(sk);
2825         struct sctp_association *asoc;
2826         struct sctp_sndinfo info;
2827 
2828         if (optlen != sizeof(info))
2829                 return -EINVAL;
2830         if (copy_from_user(&info, optval, optlen))
2831                 return -EFAULT;
2832         if (info.snd_flags &
2833             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2834               SCTP_ABORT | SCTP_EOF))
2835                 return -EINVAL;
2836 
2837         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2838         if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2839                 return -EINVAL;
2840         if (asoc) {
2841                 asoc->default_stream = info.snd_sid;
2842                 asoc->default_flags = info.snd_flags;
2843                 asoc->default_ppid = info.snd_ppid;
2844                 asoc->default_context = info.snd_context;
2845         } else {
2846                 sp->default_stream = info.snd_sid;
2847                 sp->default_flags = info.snd_flags;
2848                 sp->default_ppid = info.snd_ppid;
2849                 sp->default_context = info.snd_context;
2850         }
2851 
2852         return 0;
2853 }
2854 
2855 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2856  *
2857  * Requests that the local SCTP stack use the enclosed peer address as
2858  * the association primary.  The enclosed address must be one of the
2859  * association peer's addresses.
2860  */
2861 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2862                                         unsigned int optlen)
2863 {
2864         struct sctp_prim prim;
2865         struct sctp_transport *trans;
2866 
2867         if (optlen != sizeof(struct sctp_prim))
2868                 return -EINVAL;
2869 
2870         if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2871                 return -EFAULT;
2872 
2873         trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2874         if (!trans)
2875                 return -EINVAL;
2876 
2877         sctp_assoc_set_primary(trans->asoc, trans);
2878 
2879         return 0;
2880 }
2881 
2882 /*
2883  * 7.1.5 SCTP_NODELAY
2884  *
2885  * Turn on/off any Nagle-like algorithm.  This means that packets are
2886  * generally sent as soon as possible and no unnecessary delays are
2887  * introduced, at the cost of more packets in the network.  Expects an
2888  *  integer boolean flag.
2889  */
2890 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2891                                    unsigned int optlen)
2892 {
2893         int val;
2894 
2895         if (optlen < sizeof(int))
2896                 return -EINVAL;
2897         if (get_user(val, (int __user *)optval))
2898                 return -EFAULT;
2899 
2900         sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2901         return 0;
2902 }
2903 
2904 /*
2905  *
2906  * 7.1.1 SCTP_RTOINFO
2907  *
2908  * The protocol parameters used to initialize and bound retransmission
2909  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2910  * and modify these parameters.
2911  * All parameters are time values, in milliseconds.  A value of 0, when
2912  * modifying the parameters, indicates that the current value should not
2913  * be changed.
2914  *
2915  */
2916 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2917 {
2918         struct sctp_rtoinfo rtoinfo;
2919         struct sctp_association *asoc;
2920         unsigned long rto_min, rto_max;
2921         struct sctp_sock *sp = sctp_sk(sk);
2922 
2923         if (optlen != sizeof (struct sctp_rtoinfo))
2924                 return -EINVAL;
2925 
2926         if (copy_from_user(&rtoinfo, optval, optlen))
2927                 return -EFAULT;
2928 
2929         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2930 
2931         /* Set the values to the specific association */
2932         if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2933                 return -EINVAL;
2934 
2935         rto_max = rtoinfo.srto_max;
2936         rto_min = rtoinfo.srto_min;
2937 
2938         if (rto_max)
2939                 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2940         else
2941                 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2942 
2943         if (rto_min)
2944                 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2945         else
2946                 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2947 
2948         if (rto_min > rto_max)
2949                 return -EINVAL;
2950 
2951         if (asoc) {
2952                 if (rtoinfo.srto_initial != 0)
2953                         asoc->rto_initial =
2954                                 msecs_to_jiffies(rtoinfo.srto_initial);
2955                 asoc->rto_max = rto_max;
2956                 asoc->rto_min = rto_min;
2957         } else {
2958                 /* If there is no association or the association-id = 0
2959                  * set the values to the endpoint.
2960                  */
2961                 if (rtoinfo.srto_initial != 0)
2962                         sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2963                 sp->rtoinfo.srto_max = rto_max;
2964                 sp->rtoinfo.srto_min = rto_min;
2965         }
2966 
2967         return 0;
2968 }
2969 
2970 /*
2971  *
2972  * 7.1.2 SCTP_ASSOCINFO
2973  *
2974  * This option is used to tune the maximum retransmission attempts
2975  * of the association.
2976  * Returns an error if the new association retransmission value is
2977  * greater than the sum of the retransmission value  of the peer.
2978  * See [SCTP] for more information.
2979  *
2980  */
2981 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2982 {
2983 
2984         struct sctp_assocparams assocparams;
2985         struct sctp_association *asoc;
2986 
2987         if (optlen != sizeof(struct sctp_assocparams))
2988                 return -EINVAL;
2989         if (copy_from_user(&assocparams, optval, optlen))
2990                 return -EFAULT;
2991 
2992         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2993 
2994         if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2995                 return -EINVAL;
2996 
2997         /* Set the values to the specific association */
2998         if (asoc) {
2999                 if (assocparams.sasoc_asocmaxrxt != 0) {
3000                         __u32 path_sum = 0;
3001                         int   paths = 0;
3002                         struct sctp_transport *peer_addr;
3003 
3004                         list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3005                                         transports) {
3006                                 path_sum += peer_addr->pathmaxrxt;
3007                                 paths++;
3008                         }
3009 
3010                         /* Only validate asocmaxrxt if we have more than
3011                          * one path/transport.  We do this because path
3012                          * retransmissions are only counted when we have more
3013                          * then one path.
3014                          */
3015                         if (paths > 1 &&
3016                             assocparams.sasoc_asocmaxrxt > path_sum)
3017                                 return -EINVAL;
3018 
3019                         asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3020                 }
3021 
3022                 if (assocparams.sasoc_cookie_life != 0)
3023                         asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3024         } else {
3025                 /* Set the values to the endpoint */
3026                 struct sctp_sock *sp = sctp_sk(sk);
3027 
3028                 if (assocparams.sasoc_asocmaxrxt != 0)
3029                         sp->assocparams.sasoc_asocmaxrxt =
3030                                                 assocparams.sasoc_asocmaxrxt;
3031                 if (assocparams.sasoc_cookie_life != 0)
3032                         sp->assocparams.sasoc_cookie_life =
3033                                                 assocparams.sasoc_cookie_life;
3034         }
3035         return 0;
3036 }
3037 
3038 /*
3039  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3040  *
3041  * This socket option is a boolean flag which turns on or off mapped V4
3042  * addresses.  If this option is turned on and the socket is type
3043  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3044  * If this option is turned off, then no mapping will be done of V4
3045  * addresses and a user will receive both PF_INET6 and PF_INET type
3046  * addresses on the socket.
3047  */
3048 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3049 {
3050         int val;
3051         struct sctp_sock *sp = sctp_sk(sk);
3052 
3053         if (optlen < sizeof(int))
3054                 return -EINVAL;
3055         if (get_user(val, (int __user *)optval))
3056                 return -EFAULT;
3057         if (val)
3058                 sp->v4mapped = 1;
3059         else
3060                 sp->v4mapped = 0;
3061 
3062         return 0;
3063 }
3064 
3065 /*
3066  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3067  * This option will get or set the maximum size to put in any outgoing
3068  * SCTP DATA chunk.  If a message is larger than this size it will be
3069  * fragmented by SCTP into the specified size.  Note that the underlying
3070  * SCTP implementation may fragment into smaller sized chunks when the
3071  * PMTU of the underlying association is smaller than the value set by
3072  * the user.  The default value for this option is '' which indicates
3073  * the user is NOT limiting fragmentation and only the PMTU will effect
3074  * SCTP's choice of DATA chunk size.  Note also that values set larger
3075  * than the maximum size of an IP datagram will effectively let SCTP
3076  * control fragmentation (i.e. the same as setting this option to 0).
3077  *
3078  * The following structure is used to access and modify this parameter:
3079  *
3080  * struct sctp_assoc_value {
3081  *   sctp_assoc_t assoc_id;
3082  *   uint32_t assoc_value;
3083  * };
3084  *
3085  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3086  *    For one-to-many style sockets this parameter indicates which
3087  *    association the user is performing an action upon.  Note that if
3088  *    this field's value is zero then the endpoints default value is
3089  *    changed (effecting future associations only).
3090  * assoc_value:  This parameter specifies the maximum size in bytes.
3091  */
3092 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3093 {
3094         struct sctp_assoc_value params;
3095         struct sctp_association *asoc;
3096         struct sctp_sock *sp = sctp_sk(sk);
3097         int val;
3098 
3099         if (optlen == sizeof(int)) {
3100                 pr_warn_ratelimited(DEPRECATED
3101                                     "%s (pid %d) "
3102                                     "Use of int in maxseg socket option.\n"
3103                                     "Use struct sctp_assoc_value instead\n",
3104                                     current->comm, task_pid_nr(current));
3105                 if (copy_from_user(&val, optval, optlen))
3106                         return -EFAULT;
3107                 params.assoc_id = 0;
3108         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3109                 if (copy_from_user(&params, optval, optlen))
3110                         return -EFAULT;
3111                 val = params.assoc_value;
3112         } else
3113                 return -EINVAL;
3114 
3115         if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3116                 return -EINVAL;
3117 
3118         asoc = sctp_id2assoc(sk, params.assoc_id);
3119         if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3120                 return -EINVAL;
3121 
3122         if (asoc) {
3123                 if (val == 0) {
3124                         val = asoc->pathmtu;
3125                         val -= sp->pf->af->net_header_len;
3126                         val -= sizeof(struct sctphdr) +
3127                                         sizeof(struct sctp_data_chunk);
3128                 }
3129                 asoc->user_frag = val;
3130                 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3131         } else {
3132                 sp->user_frag = val;
3133         }
3134 
3135         return 0;
3136 }
3137 
3138 
3139 /*
3140  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3141  *
3142  *   Requests that the peer mark the enclosed address as the association
3143  *   primary. The enclosed address must be one of the association's
3144  *   locally bound addresses. The following structure is used to make a
3145  *   set primary request:
3146  */
3147 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3148                                              unsigned int optlen)
3149 {
3150         struct net *net = sock_net(sk);
3151         struct sctp_sock        *sp;
3152         struct sctp_association *asoc = NULL;
3153         struct sctp_setpeerprim prim;
3154         struct sctp_chunk       *chunk;
3155         struct sctp_af          *af;
3156         int                     err;
3157 
3158         sp = sctp_sk(sk);
3159 
3160         if (!net->sctp.addip_enable)
3161                 return -EPERM;
3162 
3163         if (optlen != sizeof(struct sctp_setpeerprim))
3164                 return -EINVAL;
3165 
3166         if (copy_from_user(&prim, optval, optlen))
3167                 return -EFAULT;
3168 
3169         asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3170         if (!asoc)
3171                 return -EINVAL;
3172 
3173         if (!asoc->peer.asconf_capable)
3174                 return -EPERM;
3175 
3176         if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3177                 return -EPERM;
3178 
3179         if (!sctp_state(asoc, ESTABLISHED))
3180                 return -ENOTCONN;
3181 
3182         af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3183         if (!af)
3184                 return -EINVAL;
3185 
3186         if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3187                 return -EADDRNOTAVAIL;
3188 
3189         if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3190                 return -EADDRNOTAVAIL;
3191 
3192         /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3193         chunk = sctp_make_asconf_set_prim(asoc,
3194                                           (union sctp_addr *)&prim.sspp_addr);
3195         if (!chunk)
3196                 return -ENOMEM;
3197 
3198         err = sctp_send_asconf(asoc, chunk);
3199 
3200         pr_debug("%s: we set peer primary addr primitively\n", __func__);
3201 
3202         return err;
3203 }
3204 
3205 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3206                                             unsigned int optlen)
3207 {
3208         struct sctp_setadaptation adaptation;
3209 
3210         if (optlen != sizeof(struct sctp_setadaptation))
3211                 return -EINVAL;
3212         if (copy_from_user(&adaptation, optval, optlen))
3213                 return -EFAULT;
3214 
3215         sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3216 
3217         return 0;
3218 }
3219 
3220 /*
3221  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3222  *
3223  * The context field in the sctp_sndrcvinfo structure is normally only
3224  * used when a failed message is retrieved holding the value that was
3225  * sent down on the actual send call.  This option allows the setting of
3226  * a default context on an association basis that will be received on
3227  * reading messages from the peer.  This is especially helpful in the
3228  * one-2-many model for an application to keep some reference to an
3229  * internal state machine that is processing messages on the
3230  * association.  Note that the setting of this value only effects
3231  * received messages from the peer and does not effect the value that is
3232  * saved with outbound messages.
3233  */
3234 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3235                                    unsigned int optlen)
3236 {
3237         struct sctp_assoc_value params;
3238         struct sctp_sock *sp;
3239         struct sctp_association *asoc;
3240 
3241         if (optlen != sizeof(struct sctp_assoc_value))
3242                 return -EINVAL;
3243         if (copy_from_user(&params, optval, optlen))
3244                 return -EFAULT;
3245 
3246         sp = sctp_sk(sk);
3247 
3248         if (params.assoc_id != 0) {
3249                 asoc = sctp_id2assoc(sk, params.assoc_id);
3250                 if (!asoc)
3251                         return -EINVAL;
3252                 asoc->default_rcv_context = params.assoc_value;
3253         } else {
3254                 sp->default_rcv_context = params.assoc_value;
3255         }
3256 
3257         return 0;
3258 }
3259 
3260 /*
3261  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3262  *
3263  * This options will at a minimum specify if the implementation is doing
3264  * fragmented interleave.  Fragmented interleave, for a one to many
3265  * socket, is when subsequent calls to receive a message may return
3266  * parts of messages from different associations.  Some implementations
3267  * may allow you to turn this value on or off.  If so, when turned off,
3268  * no fragment interleave will occur (which will cause a head of line
3269  * blocking amongst multiple associations sharing the same one to many
3270  * socket).  When this option is turned on, then each receive call may
3271  * come from a different association (thus the user must receive data
3272  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3273  * association each receive belongs to.
3274  *
3275  * This option takes a boolean value.  A non-zero value indicates that
3276  * fragmented interleave is on.  A value of zero indicates that
3277  * fragmented interleave is off.
3278  *
3279  * Note that it is important that an implementation that allows this
3280  * option to be turned on, have it off by default.  Otherwise an unaware
3281  * application using the one to many model may become confused and act
3282  * incorrectly.
3283  */
3284 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3285                                                char __user *optval,
3286                                                unsigned int optlen)
3287 {
3288         int val;
3289 
3290         if (optlen != sizeof(int))
3291                 return -EINVAL;
3292         if (get_user(val, (int __user *)optval))
3293                 return -EFAULT;
3294 
3295         sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3296 
3297         return 0;
3298 }
3299 
3300 /*
3301  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3302  *       (SCTP_PARTIAL_DELIVERY_POINT)
3303  *
3304  * This option will set or get the SCTP partial delivery point.  This
3305  * point is the size of a message where the partial delivery API will be
3306  * invoked to help free up rwnd space for the peer.  Setting this to a
3307  * lower value will cause partial deliveries to happen more often.  The
3308  * calls argument is an integer that sets or gets the partial delivery
3309  * point.  Note also that the call will fail if the user attempts to set
3310  * this value larger than the socket receive buffer size.
3311  *
3312  * Note that any single message having a length smaller than or equal to
3313  * the SCTP partial delivery point will be delivered in one single read
3314  * call as long as the user provided buffer is large enough to hold the
3315  * message.
3316  */
3317 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3318                                                   char __user *optval,
3319                                                   unsigned int optlen)
3320 {
3321         u32 val;
3322 
3323         if (optlen != sizeof(u32))
3324                 return -EINVAL;
3325         if (get_user(val, (int __user *)optval))
3326                 return -EFAULT;
3327 
3328         /* Note: We double the receive buffer from what the user sets
3329          * it to be, also initial rwnd is based on rcvbuf/2.
3330          */
3331         if (val > (sk->sk_rcvbuf >> 1))
3332                 return -EINVAL;
3333 
3334         sctp_sk(sk)->pd_point = val;
3335 
3336         return 0; /* is this the right error code? */
3337 }
3338 
3339 /*
3340  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3341  *
3342  * This option will allow a user to change the maximum burst of packets
3343  * that can be emitted by this association.  Note that the default value
3344  * is 4, and some implementations may restrict this setting so that it
3345  * can only be lowered.
3346  *
3347  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3348  * future associations inheriting the socket value.
3349  */
3350 static int sctp_setsockopt_maxburst(struct sock *sk,
3351                                     char __user *optval,
3352                                     unsigned int optlen)
3353 {
3354         struct sctp_assoc_value params;
3355         struct sctp_sock *sp;
3356         struct sctp_association *asoc;
3357         int val;
3358         int assoc_id = 0;
3359 
3360         if (optlen == sizeof(int)) {
3361                 pr_warn_ratelimited(DEPRECATED
3362                                     "%s (pid %d) "
3363                                     "Use of int in max_burst socket option deprecated.\n"
3364                                     "Use struct sctp_assoc_value instead\n",
3365                                     current->comm, task_pid_nr(current));
3366                 if (copy_from_user(&val, optval, optlen))
3367                         return -EFAULT;
3368         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3369                 if (copy_from_user(&params, optval, optlen))
3370                         return -EFAULT;
3371                 val = params.assoc_value;
3372                 assoc_id = params.assoc_id;
3373         } else
3374                 return -EINVAL;
3375 
3376         sp = sctp_sk(sk);
3377 
3378         if (assoc_id != 0) {
3379                 asoc = sctp_id2assoc(sk, assoc_id);
3380                 if (!asoc)
3381                         return -EINVAL;
3382                 asoc->max_burst = val;
3383         } else
3384                 sp->max_burst = val;
3385 
3386         return 0;
3387 }
3388 
3389 /*
3390  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3391  *
3392  * This set option adds a chunk type that the user is requesting to be
3393  * received only in an authenticated way.  Changes to the list of chunks
3394  * will only effect future associations on the socket.
3395  */
3396 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3397                                       char __user *optval,
3398                                       unsigned int optlen)
3399 {
3400         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3401         struct sctp_authchunk val;
3402 
3403         if (!ep->auth_enable)
3404                 return -EACCES;
3405 
3406         if (optlen != sizeof(struct sctp_authchunk))
3407                 return -EINVAL;
3408         if (copy_from_user(&val, optval, optlen))
3409                 return -EFAULT;
3410 
3411         switch (val.sauth_chunk) {
3412         case SCTP_CID_INIT:
3413         case SCTP_CID_INIT_ACK:
3414         case SCTP_CID_SHUTDOWN_COMPLETE:
3415         case SCTP_CID_AUTH:
3416                 return -EINVAL;
3417         }
3418 
3419         /* add this chunk id to the endpoint */
3420         return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3421 }
3422 
3423 /*
3424  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3425  *
3426  * This option gets or sets the list of HMAC algorithms that the local
3427  * endpoint requires the peer to use.
3428  */
3429 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3430                                       char __user *optval,
3431                                       unsigned int optlen)
3432 {
3433         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3434         struct sctp_hmacalgo *hmacs;
3435         u32 idents;
3436         int err;
3437 
3438         if (!ep->auth_enable)
3439                 return -EACCES;
3440 
3441         if (optlen < sizeof(struct sctp_hmacalgo))
3442                 return -EINVAL;
3443 
3444         hmacs = memdup_user(optval, optlen);
3445         if (IS_ERR(hmacs))
3446                 return PTR_ERR(hmacs);
3447 
3448         idents = hmacs->shmac_num_idents;
3449         if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3450             (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3451                 err = -EINVAL;
3452                 goto out;
3453         }
3454 
3455         err = sctp_auth_ep_set_hmacs(ep, hmacs);
3456 out:
3457         kfree(hmacs);
3458         return err;
3459 }
3460 
3461 /*
3462  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3463  *
3464  * This option will set a shared secret key which is used to build an
3465  * association shared key.
3466  */
3467 static int sctp_setsockopt_auth_key(struct sock *sk,
3468                                     char __user *optval,
3469                                     unsigned int optlen)
3470 {
3471         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3472         struct sctp_authkey *authkey;
3473         struct sctp_association *asoc;
3474         int ret;
3475 
3476         if (!ep->auth_enable)
3477                 return -EACCES;
3478 
3479         if (optlen <= sizeof(struct sctp_authkey))
3480                 return -EINVAL;
3481 
3482         authkey = memdup_user(optval, optlen);
3483         if (IS_ERR(authkey))
3484                 return PTR_ERR(authkey);
3485 
3486         if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3487                 ret = -EINVAL;
3488                 goto out;
3489         }
3490 
3491         asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3492         if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3493                 ret = -EINVAL;
3494                 goto out;
3495         }
3496 
3497         ret = sctp_auth_set_key(ep, asoc, authkey);
3498 out:
3499         kzfree(authkey);
3500         return ret;
3501 }
3502 
3503 /*
3504  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3505  *
3506  * This option will get or set the active shared key to be used to build
3507  * the association shared key.
3508  */
3509 static int sctp_setsockopt_active_key(struct sock *sk,
3510                                       char __user *optval,
3511                                       unsigned int optlen)
3512 {
3513         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3514         struct sctp_authkeyid val;
3515         struct sctp_association *asoc;
3516 
3517         if (!ep->auth_enable)
3518                 return -EACCES;
3519 
3520         if (optlen != sizeof(struct sctp_authkeyid))
3521                 return -EINVAL;
3522         if (copy_from_user(&val, optval, optlen))
3523                 return -EFAULT;
3524 
3525         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3526         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3527                 return -EINVAL;
3528 
3529         return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3530 }
3531 
3532 /*
3533  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3534  *
3535  * This set option will delete a shared secret key from use.
3536  */
3537 static int sctp_setsockopt_del_key(struct sock *sk,
3538                                    char __user *optval,
3539                                    unsigned int optlen)
3540 {
3541         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3542         struct sctp_authkeyid val;
3543         struct sctp_association *asoc;
3544 
3545         if (!ep->auth_enable)
3546                 return -EACCES;
3547 
3548         if (optlen != sizeof(struct sctp_authkeyid))
3549                 return -EINVAL;
3550         if (copy_from_user(&val, optval, optlen))
3551                 return -EFAULT;
3552 
3553         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3554         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3555                 return -EINVAL;
3556 
3557         return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3558 
3559 }
3560 
3561 /*
3562  * 8.1.23 SCTP_AUTO_ASCONF
3563  *
3564  * This option will enable or disable the use of the automatic generation of
3565  * ASCONF chunks to add and delete addresses to an existing association.  Note
3566  * that this option has two caveats namely: a) it only affects sockets that
3567  * are bound to all addresses available to the SCTP stack, and b) the system
3568  * administrator may have an overriding control that turns the ASCONF feature
3569  * off no matter what setting the socket option may have.
3570  * This option expects an integer boolean flag, where a non-zero value turns on
3571  * the option, and a zero value turns off the option.
3572  * Note. In this implementation, socket operation overrides default parameter
3573  * being set by sysctl as well as FreeBSD implementation
3574  */
3575 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3576                                         unsigned int optlen)
3577 {
3578         int val;
3579         struct sctp_sock *sp = sctp_sk(sk);
3580 
3581         if (optlen < sizeof(int))
3582                 return -EINVAL;
3583         if (get_user(val, (int __user *)optval))
3584                 return -EFAULT;
3585         if (!sctp_is_ep_boundall(sk) && val)
3586                 return -EINVAL;
3587         if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3588                 return 0;
3589 
3590         if (val == 0 && sp->do_auto_asconf) {
3591                 list_del(&sp->auto_asconf_list);
3592                 sp->do_auto_asconf = 0;
3593         } else if (val && !sp->do_auto_asconf) {
3594                 list_add_tail(&sp->auto_asconf_list,
3595                     &sock_net(sk)->sctp.auto_asconf_splist);
3596                 sp->do_auto_asconf = 1;
3597         }
3598         return 0;
3599 }
3600 
3601 /*
3602  * SCTP_PEER_ADDR_THLDS
3603  *
3604  * This option allows us to alter the partially failed threshold for one or all
3605  * transports in an association.  See Section 6.1 of:
3606  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3607  */
3608 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3609                                             char __user *optval,
3610                                             unsigned int optlen)
3611 {
3612         struct sctp_paddrthlds val;
3613         struct sctp_transport *trans;
3614         struct sctp_association *asoc;
3615 
3616         if (optlen < sizeof(struct sctp_paddrthlds))
3617                 return -EINVAL;
3618         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3619                            sizeof(struct sctp_paddrthlds)))
3620                 return -EFAULT;
3621 
3622 
3623         if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3624                 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3625                 if (!asoc)
3626                         return -ENOENT;
3627                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3628                                     transports) {
3629                         if (val.spt_pathmaxrxt)
3630                                 trans->pathmaxrxt = val.spt_pathmaxrxt;
3631                         trans->pf_retrans = val.spt_pathpfthld;
3632                 }
3633 
3634                 if (val.spt_pathmaxrxt)
3635                         asoc->pathmaxrxt = val.spt_pathmaxrxt;
3636                 asoc->pf_retrans = val.spt_pathpfthld;
3637         } else {
3638                 trans = sctp_addr_id2transport(sk, &val.spt_address,
3639                                                val.spt_assoc_id);
3640                 if (!trans)
3641                         return -ENOENT;
3642 
3643                 if (val.spt_pathmaxrxt)
3644                         trans->pathmaxrxt = val.spt_pathmaxrxt;
3645                 trans->pf_retrans = val.spt_pathpfthld;
3646         }
3647 
3648         return 0;
3649 }
3650 
3651 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3652                                        char __user *optval,
3653                                        unsigned int optlen)
3654 {
3655         int val;
3656 
3657         if (optlen < sizeof(int))
3658                 return -EINVAL;
3659         if (get_user(val, (int __user *) optval))
3660                 return -EFAULT;
3661 
3662         sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3663 
3664         return 0;
3665 }
3666 
3667 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3668                                        char __user *optval,
3669                                        unsigned int optlen)
3670 {
3671         int val;
3672 
3673         if (optlen < sizeof(int))
3674                 return -EINVAL;
3675         if (get_user(val, (int __user *) optval))
3676                 return -EFAULT;
3677 
3678         sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3679 
3680         return 0;
3681 }
3682 
3683 /* API 6.2 setsockopt(), getsockopt()
3684  *
3685  * Applications use setsockopt() and getsockopt() to set or retrieve
3686  * socket options.  Socket options are used to change the default
3687  * behavior of sockets calls.  They are described in Section 7.
3688  *
3689  * The syntax is:
3690  *
3691  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
3692  *                    int __user *optlen);
3693  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3694  *                    int optlen);
3695  *
3696  *   sd      - the socket descript.
3697  *   level   - set to IPPROTO_SCTP for all SCTP options.
3698  *   optname - the option name.
3699  *   optval  - the buffer to store the value of the option.
3700  *   optlen  - the size of the buffer.
3701  */
3702 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3703                            char __user *optval, unsigned int optlen)
3704 {
3705         int retval = 0;
3706 
3707         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3708 
3709         /* I can hardly begin to describe how wrong this is.  This is
3710          * so broken as to be worse than useless.  The API draft
3711          * REALLY is NOT helpful here...  I am not convinced that the
3712          * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3713          * are at all well-founded.
3714          */
3715         if (level != SOL_SCTP) {
3716                 struct sctp_af *af = sctp_sk(sk)->pf->af;
3717                 retval = af->setsockopt(sk, level, optname, optval, optlen);
3718                 goto out_nounlock;
3719         }
3720 
3721         lock_sock(sk);
3722 
3723         switch (optname) {
3724         case SCTP_SOCKOPT_BINDX_ADD:
3725                 /* 'optlen' is the size of the addresses buffer. */
3726                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3727                                                optlen, SCTP_BINDX_ADD_ADDR);
3728                 break;
3729 
3730         case SCTP_SOCKOPT_BINDX_REM:
3731                 /* 'optlen' is the size of the addresses buffer. */
3732                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3733                                                optlen, SCTP_BINDX_REM_ADDR);
3734                 break;
3735 
3736         case SCTP_SOCKOPT_CONNECTX_OLD:
3737                 /* 'optlen' is the size of the addresses buffer. */
3738                 retval = sctp_setsockopt_connectx_old(sk,
3739                                             (struct sockaddr __user *)optval,
3740                                             optlen);
3741                 break;
3742 
3743         case SCTP_SOCKOPT_CONNECTX:
3744                 /* 'optlen' is the size of the addresses buffer. */
3745                 retval = sctp_setsockopt_connectx(sk,
3746                                             (struct sockaddr __user *)optval,
3747                                             optlen);
3748                 break;
3749 
3750         case SCTP_DISABLE_FRAGMENTS:
3751                 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3752                 break;
3753 
3754         case SCTP_EVENTS:
3755                 retval = sctp_setsockopt_events(sk, optval, optlen);
3756                 break;
3757 
3758         case SCTP_AUTOCLOSE:
3759                 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3760                 break;
3761 
3762         case SCTP_PEER_ADDR_PARAMS:
3763                 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3764                 break;
3765 
3766         case SCTP_DELAYED_SACK:
3767                 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3768                 break;
3769         case SCTP_PARTIAL_DELIVERY_POINT:
3770                 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3771                 break;
3772 
3773         case SCTP_INITMSG:
3774                 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3775                 break;
3776         case SCTP_DEFAULT_SEND_PARAM:
3777                 retval = sctp_setsockopt_default_send_param(sk, optval,
3778                                                             optlen);
3779                 break;
3780         case SCTP_DEFAULT_SNDINFO:
3781                 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3782                 break;
3783         case SCTP_PRIMARY_ADDR:
3784                 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3785                 break;
3786         case SCTP_SET_PEER_PRIMARY_ADDR:
3787                 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3788                 break;
3789         case SCTP_NODELAY:
3790                 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3791                 break;
3792         case SCTP_RTOINFO:
3793                 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3794                 break;
3795         case SCTP_ASSOCINFO:
3796                 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3797                 break;
3798         case SCTP_I_WANT_MAPPED_V4_ADDR:
3799                 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3800                 break;
3801         case SCTP_MAXSEG:
3802                 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3803                 break;
3804         case SCTP_ADAPTATION_LAYER:
3805                 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3806                 break;
3807         case SCTP_CONTEXT:
3808                 retval = sctp_setsockopt_context(sk, optval, optlen);
3809                 break;
3810         case SCTP_FRAGMENT_INTERLEAVE:
3811                 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3812                 break;
3813         case SCTP_MAX_BURST:
3814                 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3815                 break;
3816         case SCTP_AUTH_CHUNK:
3817                 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3818                 break;
3819         case SCTP_HMAC_IDENT:
3820                 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3821                 break;
3822         case SCTP_AUTH_KEY:
3823                 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3824                 break;
3825         case SCTP_AUTH_ACTIVE_KEY:
3826                 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3827                 break;
3828         case SCTP_AUTH_DELETE_KEY:
3829                 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3830                 break;
3831         case SCTP_AUTO_ASCONF:
3832                 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3833                 break;
3834         case SCTP_PEER_ADDR_THLDS:
3835                 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3836                 break;
3837         case SCTP_RECVRCVINFO:
3838                 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3839                 break;
3840         case SCTP_RECVNXTINFO:
3841                 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3842                 break;
3843         default:
3844                 retval = -ENOPROTOOPT;
3845                 break;
3846         }
3847 
3848         release_sock(sk);
3849 
3850 out_nounlock:
3851         return retval;
3852 }
3853 
3854 /* API 3.1.6 connect() - UDP Style Syntax
3855  *
3856  * An application may use the connect() call in the UDP model to initiate an
3857  * association without sending data.
3858  *
3859  * The syntax is:
3860  *
3861  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3862  *
3863  * sd: the socket descriptor to have a new association added to.
3864  *
3865  * nam: the address structure (either struct sockaddr_in or struct
3866  *    sockaddr_in6 defined in RFC2553 [7]).
3867  *
3868  * len: the size of the address.
3869  */
3870 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3871                         int addr_len)
3872 {
3873         int err = 0;
3874         struct sctp_af *af;
3875 
3876         lock_sock(sk);
3877 
3878         pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3879                  addr, addr_len);
3880 
3881         /* Validate addr_len before calling common connect/connectx routine. */
3882         af = sctp_get_af_specific(addr->sa_family);
3883         if (!af || addr_len < af->sockaddr_len) {
3884                 err = -EINVAL;
3885         } else {
3886                 /* Pass correct addr len to common routine (so it knows there
3887                  * is only one address being passed.
3888                  */
3889                 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3890         }
3891 
3892         release_sock(sk);
3893         return err;
3894 }
3895 
3896 /* FIXME: Write comments. */
3897 static int sctp_disconnect(struct sock *sk, int flags)
3898 {
3899         return -EOPNOTSUPP; /* STUB */
3900 }
3901 
3902 /* 4.1.4 accept() - TCP Style Syntax
3903  *
3904  * Applications use accept() call to remove an established SCTP
3905  * association from the accept queue of the endpoint.  A new socket
3906  * descriptor will be returned from accept() to represent the newly
3907  * formed association.
3908  */
3909 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3910 {
3911         struct sctp_sock *sp;
3912         struct sctp_endpoint *ep;
3913         struct sock *newsk = NULL;
3914         struct sctp_association *asoc;
3915         long timeo;
3916         int error = 0;
3917 
3918         lock_sock(sk);
3919 
3920         sp = sctp_sk(sk);
3921         ep = sp->ep;
3922 
3923         if (!sctp_style(sk, TCP)) {
3924                 error = -EOPNOTSUPP;
3925                 goto out;
3926         }
3927 
3928         if (!sctp_sstate(sk, LISTENING)) {
3929                 error = -EINVAL;
3930                 goto out;
3931         }
3932 
3933         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3934 
3935         error = sctp_wait_for_accept(sk, timeo);
3936         if (error)
3937                 goto out;
3938 
3939         /* We treat the list of associations on the endpoint as the accept
3940          * queue and pick the first association on the list.
3941          */
3942         asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3943 
3944         newsk = sp->pf->create_accept_sk(sk, asoc);
3945         if (!newsk) {
3946                 error = -ENOMEM;
3947                 goto out;
3948         }
3949 
3950         /* Populate the fields of the newsk from the oldsk and migrate the
3951          * asoc to the newsk.
3952          */
3953         sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3954 
3955 out:
3956         release_sock(sk);
3957         *err = error;
3958         return newsk;
3959 }
3960 
3961 /* The SCTP ioctl handler. */
3962 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3963 {
3964         int rc = -ENOTCONN;
3965 
3966         lock_sock(sk);
3967 
3968         /*
3969          * SEQPACKET-style sockets in LISTENING state are valid, for
3970          * SCTP, so only discard TCP-style sockets in LISTENING state.
3971          */
3972         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3973                 goto out;
3974 
3975         switch (cmd) {
3976         case SIOCINQ: {
3977                 struct sk_buff *skb;
3978                 unsigned int amount = 0;
3979 
3980                 skb = skb_peek(&sk->sk_receive_queue);
3981                 if (skb != NULL) {
3982                         /*
3983                          * We will only return the amount of this packet since
3984                          * that is all that will be read.
3985                          */
3986                         amount = skb->len;
3987                 }
3988                 rc = put_user(amount, (int __user *)arg);
3989                 break;
3990         }
3991         default:
3992                 rc = -ENOIOCTLCMD;
3993                 break;
3994         }
3995 out:
3996         release_sock(sk);
3997         return rc;
3998 }
3999 
4000 /* This is the function which gets called during socket creation to
4001  * initialized the SCTP-specific portion of the sock.
4002  * The sock structure should already be zero-filled memory.
4003  */
4004 static int sctp_init_sock(struct sock *sk)
4005 {
4006         struct net *net = sock_net(sk);
4007         struct sctp_sock *sp;
4008 
4009         pr_debug("%s: sk:%p\n", __func__, sk);
4010 
4011         sp = sctp_sk(sk);
4012 
4013         /* Initialize the SCTP per socket area.  */
4014         switch (sk->sk_type) {
4015         case SOCK_SEQPACKET:
4016                 sp->type = SCTP_SOCKET_UDP;
4017                 break;
4018         case SOCK_STREAM:
4019                 sp->type = SCTP_SOCKET_TCP;
4020                 break;
4021         default:
4022                 return -ESOCKTNOSUPPORT;
4023         }
4024 
4025         /* Initialize default send parameters. These parameters can be
4026          * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4027          */
4028         sp->default_stream = 0;
4029         sp->default_ppid = 0;
4030         sp->default_flags = 0;
4031         sp->default_context = 0;
4032         sp->default_timetolive = 0;
4033 
4034         sp->default_rcv_context = 0;
4035         sp->max_burst = net->sctp.max_burst;
4036 
4037         sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4038 
4039         /* Initialize default setup parameters. These parameters
4040          * can be modified with the SCTP_INITMSG socket option or
4041          * overridden by the SCTP_INIT CMSG.
4042          */
4043         sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
4044         sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4045         sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
4046         sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4047 
4048         /* Initialize default RTO related parameters.  These parameters can
4049          * be modified for with the SCTP_RTOINFO socket option.
4050          */
4051         sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4052         sp->rtoinfo.srto_max     = net->sctp.rto_max;
4053         sp->rtoinfo.srto_min     = net->sctp.rto_min;
4054 
4055         /* Initialize default association related parameters. These parameters
4056          * can be modified with the SCTP_ASSOCINFO socket option.
4057          */
4058         sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4059         sp->assocparams.sasoc_number_peer_destinations = 0;
4060         sp->assocparams.sasoc_peer_rwnd = 0;
4061         sp->assocparams.sasoc_local_rwnd = 0;
4062         sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4063 
4064         /* Initialize default event subscriptions. By default, all the
4065          * options are off.
4066          */
4067         memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4068 
4069         /* Default Peer Address Parameters.  These defaults can
4070          * be modified via SCTP_PEER_ADDR_PARAMS
4071          */
4072         sp->hbinterval  = net->sctp.hb_interval;
4073         sp->pathmaxrxt  = net->sctp.max_retrans_path;
4074         sp->pathmtu     = 0; /* allow default discovery */
4075         sp->sackdelay   = net->sctp.sack_timeout;
4076         sp->sackfreq    = 2;
4077         sp->param_flags = SPP_HB_ENABLE |
4078                           SPP_PMTUD_ENABLE |
4079                           SPP_SACKDELAY_ENABLE;
4080 
4081         /* If enabled no SCTP message fragmentation will be performed.
4082          * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4083          */
4084         sp->disable_fragments = 0;
4085 
4086         /* Enable Nagle algorithm by default.  */
4087         sp->nodelay           = 0;
4088 
4089         sp->recvrcvinfo = 0;
4090         sp->recvnxtinfo = 0;
4091 
4092         /* Enable by default. */
4093         sp->v4mapped          = 1;
4094 
4095         /* Auto-close idle associations after the configured
4096          * number of seconds.  A value of 0 disables this
4097          * feature.  Configure through the SCTP_AUTOCLOSE socket option,
4098          * for UDP-style sockets only.
4099          */
4100         sp->autoclose         = 0;
4101 
4102         /* User specified fragmentation limit. */
4103         sp->user_frag         = 0;
4104 
4105         sp->adaptation_ind = 0;
4106 
4107         sp->pf = sctp_get_pf_specific(sk->sk_family);
4108 
4109         /* Control variables for partial data delivery. */
4110         atomic_set(&sp->pd_mode, 0);
4111         skb_queue_head_init(&sp->pd_lobby);
4112         sp->frag_interleave = 0;
4113 
4114         /* Create a per socket endpoint structure.  Even if we
4115          * change the data structure relationships, this may still
4116          * be useful for storing pre-connect address information.
4117          */
4118         sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4119         if (!sp->ep)
4120                 return -ENOMEM;
4121 
4122         sp->hmac = NULL;
4123 
4124         sk->sk_destruct = sctp_destruct_sock;
4125 
4126         SCTP_DBG_OBJCNT_INC(sock);
4127 
4128         local_bh_disable();
4129         percpu_counter_inc(&sctp_sockets_allocated);
4130         sock_prot_inuse_add(net, sk->sk_prot, 1);
4131         if (net->sctp.default_auto_asconf) {
4132                 list_add_tail(&sp->auto_asconf_list,
4133                     &net->sctp.auto_asconf_splist);
4134                 sp->do_auto_asconf = 1;
4135         } else
4136                 sp->do_auto_asconf = 0;
4137         local_bh_enable();
4138 
4139         return 0;
4140 }
4141 
4142 /* Cleanup any SCTP per socket resources.  */
4143 static void sctp_destroy_sock(struct sock *sk)
4144 {
4145         struct sctp_sock *sp;
4146 
4147         pr_debug("%s: sk:%p\n", __func__, sk);
4148 
4149         /* Release our hold on the endpoint. */
4150         sp = sctp_sk(sk);
4151         /* This could happen during socket init, thus we bail out
4152          * early, since the rest of the below is not setup either.
4153          */
4154         if (sp->ep == NULL)
4155                 return;
4156 
4157         if (sp->do_auto_asconf) {
4158                 sp->do_auto_asconf = 0;
4159                 list_del(&sp->auto_asconf_list);
4160         }
4161         sctp_endpoint_free(sp->ep);
4162         local_bh_disable();
4163         percpu_counter_dec(&sctp_sockets_allocated);
4164         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4165         local_bh_enable();
4166 }
4167 
4168 /* Triggered when there are no references on the socket anymore */
4169 static void sctp_destruct_sock(struct sock *sk)
4170 {
4171         struct sctp_sock *sp = sctp_sk(sk);
4172 
4173         /* Free up the HMAC transform. */
4174         crypto_free_hash(sp->hmac);
4175 
4176         inet_sock_destruct(sk);
4177 }
4178 
4179 /* API 4.1.7 shutdown() - TCP Style Syntax
4180  *     int shutdown(int socket, int how);
4181  *
4182  *     sd      - the socket descriptor of the association to be closed.
4183  *     how     - Specifies the type of shutdown.  The  values  are
4184  *               as follows:
4185  *               SHUT_RD
4186  *                     Disables further receive operations. No SCTP
4187  *                     protocol action is taken.
4188  *               SHUT_WR
4189  *                     Disables further send operations, and initiates
4190  *                     the SCTP shutdown sequence.
4191  *               SHUT_RDWR
4192  *                     Disables further send  and  receive  operations
4193  *                     and initiates the SCTP shutdown sequence.
4194  */
4195 static void sctp_shutdown(struct sock *sk, int how)
4196 {
4197         struct net *net = sock_net(sk);
4198         struct sctp_endpoint *ep;
4199         struct sctp_association *asoc;
4200 
4201         if (!sctp_style(sk, TCP))
4202                 return;
4203 
4204         if (how & SEND_SHUTDOWN) {
4205                 ep = sctp_sk(sk)->ep;
4206                 if (!list_empty(&ep->asocs)) {
4207                         asoc = list_entry(ep->asocs.next,
4208                                           struct sctp_association, asocs);
4209                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
4210                 }
4211         }
4212 }
4213 
4214 /* 7.2.1 Association Status (SCTP_STATUS)
4215 
4216  * Applications can retrieve current status information about an
4217  * association, including association state, peer receiver window size,
4218  * number of unacked data chunks, and number of data chunks pending
4219  * receipt.  This information is read-only.
4220  */
4221 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4222                                        char __user *optval,
4223                                        int __user *optlen)
4224 {
4225         struct sctp_status status;
4226         struct sctp_association *asoc = NULL;
4227         struct sctp_transport *transport;
4228         sctp_assoc_t associd;
4229         int retval = 0;
4230 
4231         if (len < sizeof(status)) {
4232                 retval = -EINVAL;
4233                 goto out;
4234         }
4235 
4236         len = sizeof(status);
4237         if (copy_from_user(&status, optval, len)) {
4238                 retval = -EFAULT;
4239                 goto out;
4240         }
4241 
4242         associd = status.sstat_assoc_id;
4243         asoc = sctp_id2assoc(sk, associd);
4244         if (!asoc) {
4245                 retval = -EINVAL;
4246                 goto out;
4247         }
4248 
4249         transport = asoc->peer.primary_path;
4250 
4251         status.sstat_assoc_id = sctp_assoc2id(asoc);
4252         status.sstat_state = sctp_assoc_to_state(asoc);
4253         status.sstat_rwnd =  asoc->peer.rwnd;
4254         status.sstat_unackdata = asoc->unack_data;
4255 
4256         status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4257         status.sstat_instrms = asoc->c.sinit_max_instreams;
4258         status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4259         status.sstat_fragmentation_point = asoc->frag_point;
4260         status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4261         memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4262                         transport->af_specific->sockaddr_len);
4263         /* Map ipv4 address into v4-mapped-on-v6 address.  */
4264         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4265                 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4266         status.sstat_primary.spinfo_state = transport->state;
4267         status.sstat_primary.spinfo_cwnd = transport->cwnd;
4268         status.sstat_primary.spinfo_srtt = transport->srtt;
4269         status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4270         status.sstat_primary.spinfo_mtu = transport->pathmtu;
4271 
4272         if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4273                 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4274 
4275         if (put_user(len, optlen)) {
4276                 retval = -EFAULT;
4277                 goto out;
4278         }
4279 
4280         pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4281                  __func__, len, status.sstat_state, status.sstat_rwnd,
4282                  status.sstat_assoc_id);
4283 
4284         if (copy_to_user(optval, &status, len)) {
4285                 retval = -EFAULT;
4286                 goto out;
4287         }
4288 
4289 out:
4290         return retval;
4291 }
4292 
4293 
4294 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4295  *
4296  * Applications can retrieve information about a specific peer address
4297  * of an association, including its reachability state, congestion
4298  * window, and retransmission timer values.  This information is
4299  * read-only.
4300  */
4301 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4302                                           char __user *optval,
4303                                           int __user *optlen)
4304 {
4305         struct sctp_paddrinfo pinfo;
4306         struct sctp_transport *transport;
4307         int retval = 0;
4308 
4309         if (len < sizeof(pinfo)) {
4310                 retval = -EINVAL;
4311                 goto out;
4312         }
4313 
4314         len = sizeof(pinfo);
4315         if (copy_from_user(&pinfo, optval, len)) {
4316                 retval = -EFAULT;
4317                 goto out;
4318         }
4319 
4320         transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4321                                            pinfo.spinfo_assoc_id);
4322         if (!transport)
4323                 return -EINVAL;
4324 
4325         pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4326         pinfo.spinfo_state = transport->state;
4327         pinfo.spinfo_cwnd = transport->cwnd;
4328         pinfo.spinfo_srtt = transport->srtt;
4329         pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4330         pinfo.spinfo_mtu = transport->pathmtu;
4331 
4332         if (pinfo.spinfo_state == SCTP_UNKNOWN)
4333                 pinfo.spinfo_state = SCTP_ACTIVE;
4334 
4335         if (put_user(len, optlen)) {
4336                 retval = -EFAULT;
4337                 goto out;
4338         }
4339 
4340         if (copy_to_user(optval, &pinfo, len)) {
4341                 retval = -EFAULT;
4342                 goto out;
4343         }
4344 
4345 out:
4346         return retval;
4347 }
4348 
4349 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4350  *
4351  * This option is a on/off flag.  If enabled no SCTP message
4352  * fragmentation will be performed.  Instead if a message being sent
4353  * exceeds the current PMTU size, the message will NOT be sent and
4354  * instead a error will be indicated to the user.
4355  */
4356 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4357                                         char __user *optval, int __user *optlen)
4358 {
4359         int val;
4360 
4361         if (len < sizeof(int))
4362                 return -EINVAL;
4363 
4364         len = sizeof(int);
4365         val = (sctp_sk(sk)->disable_fragments == 1);
4366         if (put_user(len, optlen))
4367                 return -EFAULT;
4368         if (copy_to_user(optval, &val, len))
4369                 return -EFAULT;
4370         return 0;
4371 }
4372 
4373 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4374  *
4375  * This socket option is used to specify various notifications and
4376  * ancillary data the user wishes to receive.
4377  */
4378 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4379                                   int __user *optlen)
4380 {
4381         if (len <= 0)
4382                 return -EINVAL;
4383         if (len > sizeof(struct sctp_event_subscribe))
4384                 len = sizeof(struct sctp_event_subscribe);
4385         if (put_user(len, optlen))
4386                 return -EFAULT;
4387         if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4388                 return -EFAULT;
4389         return 0;
4390 }
4391 
4392 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4393  *
4394  * This socket option is applicable to the UDP-style socket only.  When
4395  * set it will cause associations that are idle for more than the
4396  * specified number of seconds to automatically close.  An association
4397  * being idle is defined an association that has NOT sent or received
4398  * user data.  The special value of '' indicates that no automatic
4399  * close of any associations should be performed.  The option expects an
4400  * integer defining the number of seconds of idle time before an
4401  * association is closed.
4402  */
4403 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4404 {
4405         /* Applicable to UDP-style socket only */
4406         if (sctp_style(sk, TCP))
4407                 return -EOPNOTSUPP;
4408         if (len < sizeof(int))
4409                 return -EINVAL;
4410         len = sizeof(int);
4411         if (put_user(len, optlen))
4412                 return -EFAULT;
4413         if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4414                 return -EFAULT;
4415         return 0;
4416 }
4417 
4418 /* Helper routine to branch off an association to a new socket.  */
4419 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4420 {
4421         struct sctp_association *asoc = sctp_id2assoc(sk, id);
4422         struct sctp_sock *sp = sctp_sk(sk);
4423         struct socket *sock;
4424         int err = 0;
4425 
4426         if (!asoc)
4427                 return -EINVAL;
4428 
4429         /* An association cannot be branched off from an already peeled-off
4430          * socket, nor is this supported for tcp style sockets.
4431          */
4432         if (!sctp_style(sk, UDP))
4433                 return -EINVAL;
4434 
4435         /* Create a new socket.  */
4436         err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4437         if (err < 0)
4438                 return err;
4439 
4440         sctp_copy_sock(sock->sk, sk, asoc);
4441 
4442         /* Make peeled-off sockets more like 1-1 accepted sockets.
4443          * Set the daddr and initialize id to something more random
4444          */
4445         sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4446 
4447         /* Populate the fields of the newsk from the oldsk and migrate the
4448          * asoc to the newsk.
4449          */
4450         sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4451 
4452         *sockp = sock;
4453 
4454         return err;
4455 }
4456 EXPORT_SYMBOL(sctp_do_peeloff);
4457 
4458 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4459 {
4460         sctp_peeloff_arg_t peeloff;
4461         struct socket *newsock;
4462         struct file *newfile;
4463         int retval = 0;
4464 
4465         if (len < sizeof(sctp_peeloff_arg_t))
4466                 return -EINVAL;
4467         len = sizeof(sctp_peeloff_arg_t);
4468         if (copy_from_user(&peeloff, optval, len))
4469                 return -EFAULT;
4470 
4471         retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4472         if (retval < 0)
4473                 goto out;
4474 
4475         /* Map the socket to an unused fd that can be returned to the user.  */
4476         retval = get_unused_fd_flags(0);
4477         if (retval < 0) {
4478                 sock_release(newsock);
4479                 goto out;
4480         }
4481 
4482         newfile = sock_alloc_file(newsock, 0, NULL);
4483         if (unlikely(IS_ERR(newfile))) {
4484                 put_unused_fd(retval);
4485                 sock_release(newsock);
4486                 return PTR_ERR(newfile);
4487         }
4488 
4489         pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4490                  retval);
4491 
4492         /* Return the fd mapped to the new socket.  */
4493         if (put_user(len, optlen)) {
4494                 fput(newfile);
4495                 put_unused_fd(retval);
4496                 return -EFAULT;
4497         }
4498         peeloff.sd = retval;
4499         if (copy_to_user(optval, &peeloff, len)) {
4500                 fput(newfile);
4501                 put_unused_fd(retval);
4502                 return -EFAULT;
4503         }
4504         fd_install(retval, newfile);
4505 out:
4506         return retval;
4507 }
4508 
4509 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4510  *
4511  * Applications can enable or disable heartbeats for any peer address of
4512  * an association, modify an address's heartbeat interval, force a
4513  * heartbeat to be sent immediately, and adjust the address's maximum
4514  * number of retransmissions sent before an address is considered
4515  * unreachable.  The following structure is used to access and modify an
4516  * address's parameters:
4517  *
4518  *  struct sctp_paddrparams {
4519  *     sctp_assoc_t            spp_assoc_id;
4520  *     struct sockaddr_storage spp_address;
4521  *     uint32_t                spp_hbinterval;
4522  *     uint16_t                spp_pathmaxrxt;
4523  *     uint32_t                spp_pathmtu;
4524  *     uint32_t                spp_sackdelay;
4525  *     uint32_t                spp_flags;
4526  * };
4527  *
4528  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
4529  *                     application, and identifies the association for
4530  *                     this query.
4531  *   spp_address     - This specifies which address is of interest.
4532  *   spp_hbinterval  - This contains the value of the heartbeat interval,
4533  *                     in milliseconds.  If a  value of zero
4534  *                     is present in this field then no changes are to
4535  *                     be made to this parameter.
4536  *   spp_pathmaxrxt  - This contains the maximum number of
4537  *                     retransmissions before this address shall be
4538  *                     considered unreachable. If a  value of zero
4539  *                     is present in this field then no changes are to
4540  *                     be made to this parameter.
4541  *   spp_pathmtu     - When Path MTU discovery is disabled the value
4542  *                     specified here will be the "fixed" path mtu.
4543  *                     Note that if the spp_address field is empty
4544  *                     then all associations on this address will
4545  *                     have this fixed path mtu set upon them.
4546  *
4547  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
4548  *                     the number of milliseconds that sacks will be delayed
4549  *                     for. This value will apply to all addresses of an
4550  *                     association if the spp_address field is empty. Note
4551  *                     also, that if delayed sack is enabled and this
4552  *                     value is set to 0, no change is made to the last
4553  *                     recorded delayed sack timer value.
4554  *
4555  *   spp_flags       - These flags are used to control various features
4556  *                     on an association. The flag field may contain
4557  *                     zero or more of the following options.
4558  *
4559  *                     SPP_HB_ENABLE  - Enable heartbeats on the
4560  *                     specified address. Note that if the address
4561  *                     field is empty all addresses for the association
4562  *                     have heartbeats enabled upon them.
4563  *
4564  *                     SPP_HB_DISABLE - Disable heartbeats on the
4565  *                     speicifed address. Note that if the address
4566  *                     field is empty all addresses for the association
4567  *                     will have their heartbeats disabled. Note also
4568  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
4569  *                     mutually exclusive, only one of these two should
4570  *                     be specified. Enabling both fields will have
4571  *                     undetermined results.
4572  *
4573  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
4574  *                     to be made immediately.
4575  *
4576  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
4577  *                     discovery upon the specified address. Note that
4578  *                     if the address feild is empty then all addresses
4579  *                     on the association are effected.
4580  *
4581  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
4582  *                     discovery upon the specified address. Note that
4583  *                     if the address feild is empty then all addresses
4584  *                     on the association are effected. Not also that
4585  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4586  *                     exclusive. Enabling both will have undetermined
4587  *                     results.
4588  *
4589  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
4590  *                     on delayed sack. The time specified in spp_sackdelay
4591  *                     is used to specify the sack delay for this address. Note
4592  *                     that if spp_address is empty then all addresses will
4593  *                     enable delayed sack and take on the sack delay
4594  *                     value specified in spp_sackdelay.
4595  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
4596  *                     off delayed sack. If the spp_address field is blank then
4597  *                     delayed sack is disabled for the entire association. Note
4598  *                     also that this field is mutually exclusive to
4599  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
4600  *                     results.
4601  */
4602 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4603                                             char __user *optval, int __user *optlen)
4604 {
4605         struct sctp_paddrparams  params;
4606         struct sctp_transport   *trans = NULL;
4607         struct sctp_association *asoc = NULL;
4608         struct sctp_sock        *sp = sctp_sk(sk);
4609 
4610         if (len < sizeof(struct sctp_paddrparams))
4611                 return -EINVAL;
4612         len = sizeof(struct sctp_paddrparams);
4613         if (copy_from_user(&params, optval, len))
4614                 return -EFAULT;
4615 
4616         /* If an address other than INADDR_ANY is specified, and
4617          * no transport is found, then the request is invalid.
4618          */
4619         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
4620                 trans = sctp_addr_id2transport(sk, &params.spp_address,
4621                                                params.spp_assoc_id);
4622                 if (!trans) {
4623                         pr_debug("%s: failed no transport\n", __func__);
4624                         return -EINVAL;
4625                 }
4626         }
4627 
4628         /* Get association, if assoc_id != 0 and the socket is a one
4629          * to many style socket, and an association was not found, then
4630          * the id was invalid.
4631          */
4632         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4633         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4634                 pr_debug("%s: failed no association\n", __func__);
4635                 return -EINVAL;
4636         }
4637 
4638         if (trans) {
4639                 /* Fetch transport values. */
4640                 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4641                 params.spp_pathmtu    = trans->pathmtu;
4642                 params.spp_pathmaxrxt = trans->pathmaxrxt;
4643                 params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
4644 
4645                 /*draft-11 doesn't say what to return in spp_flags*/
4646                 params.spp_flags      = trans->param_flags;
4647         } else if (asoc) {
4648                 /* Fetch association values. */
4649                 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4650                 params.spp_pathmtu    = asoc->pathmtu;
4651                 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4652                 params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
4653 
4654                 /*draft-11 doesn't say what to return in spp_flags*/
4655                 params.spp_flags      = asoc->param_flags;
4656         } else {
4657                 /* Fetch socket values. */
4658                 params.spp_hbinterval = sp->hbinterval;
4659                 params.spp_pathmtu    = sp->pathmtu;
4660                 params.spp_sackdelay  = sp->sackdelay;
4661                 params.spp_pathmaxrxt = sp->pathmaxrxt;
4662 
4663                 /*draft-11 doesn't say what to return in spp_flags*/
4664                 params.spp_flags      = sp->param_flags;
4665         }
4666 
4667         if (copy_to_user(optval, &params, len))
4668                 return -EFAULT;
4669 
4670         if (put_user(len, optlen))
4671                 return -EFAULT;
4672 
4673         return 0;
4674 }
4675 
4676 /*
4677  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
4678  *
4679  * This option will effect the way delayed acks are performed.  This
4680  * option allows you to get or set the delayed ack time, in
4681  * milliseconds.  It also allows changing the delayed ack frequency.
4682  * Changing the frequency to 1 disables the delayed sack algorithm.  If
4683  * the assoc_id is 0, then this sets or gets the endpoints default
4684  * values.  If the assoc_id field is non-zero, then the set or get
4685  * effects the specified association for the one to many model (the
4686  * assoc_id field is ignored by the one to one model).  Note that if
4687  * sack_delay or sack_freq are 0 when setting this option, then the
4688  * current values will remain unchanged.
4689  *
4690  * struct sctp_sack_info {
4691  *     sctp_assoc_t            sack_assoc_id;
4692  *     uint32_t                sack_delay;
4693  *     uint32_t                sack_freq;
4694  * };
4695  *
4696  * sack_assoc_id -  This parameter, indicates which association the user
4697  *    is performing an action upon.  Note that if this field's value is
4698  *    zero then the endpoints default value is changed (effecting future
4699  *    associations only).
4700  *
4701  * sack_delay -  This parameter contains the number of milliseconds that
4702  *    the user is requesting the delayed ACK timer be set to.  Note that
4703  *    this value is defined in the standard to be between 200 and 500
4704  *    milliseconds.
4705  *
4706  * sack_freq -  This parameter contains the number of packets that must
4707  *    be received before a sack is sent without waiting for the delay
4708  *    timer to expire.  The default value for this is 2, setting this
4709  *    value to 1 will disable the delayed sack algorithm.
4710  */
4711 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4712                                             char __user *optval,
4713                                             int __user *optlen)
4714 {
4715         struct sctp_sack_info    params;
4716         struct sctp_association *asoc = NULL;
4717         struct sctp_sock        *sp = sctp_sk(sk);
4718 
4719         if (len >= sizeof(struct sctp_sack_info)) {
4720                 len = sizeof(struct sctp_sack_info);
4721 
4722                 if (copy_from_user(&params, optval, len))
4723                         return -EFAULT;
4724         } else if (len == sizeof(struct sctp_assoc_value)) {
4725                 pr_warn_ratelimited(DEPRECATED
4726                                     "%s (pid %d) "
4727                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4728                                     "Use struct sctp_sack_info instead\n",
4729                                     current->comm, task_pid_nr(current));
4730                 if (copy_from_user(&params, optval, len))
4731                         return -EFAULT;
4732         } else
4733                 return -EINVAL;
4734 
4735         /* Get association, if sack_assoc_id != 0 and the socket is a one
4736          * to many style socket, and an association was not found, then
4737          * the id was invalid.
4738          */
4739         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4740         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4741                 return -EINVAL;
4742 
4743         if (asoc) {
4744                 /* Fetch association values. */
4745                 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4746                         params.sack_delay = jiffies_to_msecs(
4747                                 asoc->sackdelay);
4748                         params.sack_freq = asoc->sackfreq;
4749 
4750                 } else {
4751                         params.sack_delay = 0;
4752                         params.sack_freq = 1;
4753                 }
4754         } else {
4755                 /* Fetch socket values. */
4756                 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4757                         params.sack_delay  = sp->sackdelay;
4758                         params.sack_freq = sp->sackfreq;
4759                 } else {
4760                         params.sack_delay  = 0;
4761                         params.sack_freq = 1;
4762                 }
4763         }
4764 
4765         if (copy_to_user(optval, &params, len))
4766                 return -EFAULT;
4767 
4768         if (put_user(len, optlen))
4769                 return -EFAULT;
4770 
4771         return 0;
4772 }
4773 
4774 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4775  *
4776  * Applications can specify protocol parameters for the default association
4777  * initialization.  The option name argument to setsockopt() and getsockopt()
4778  * is SCTP_INITMSG.
4779  *
4780  * Setting initialization parameters is effective only on an unconnected
4781  * socket (for UDP-style sockets only future associations are effected
4782  * by the change).  With TCP-style sockets, this option is inherited by
4783  * sockets derived from a listener socket.
4784  */
4785 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4786 {
4787         if (len < sizeof(struct sctp_initmsg))
4788                 return -EINVAL;
4789         len = sizeof(struct sctp_initmsg);
4790         if (put_user(len, optlen))
4791                 return -EFAULT;
4792         if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4793                 return -EFAULT;
4794         return 0;
4795 }
4796 
4797 
4798 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4799                                       char __user *optval, int __user *optlen)
4800 {
4801         struct sctp_association *asoc;
4802         int cnt = 0;
4803         struct sctp_getaddrs getaddrs;
4804         struct sctp_transport *from;
4805         void __user *to;
4806         union sctp_addr temp;
4807         struct sctp_sock *sp = sctp_sk(sk);
4808         int addrlen;
4809         size_t space_left;
4810         int bytes_copied;
4811 
4812         if (len < sizeof(struct sctp_getaddrs))
4813                 return -EINVAL;
4814 
4815         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4816                 return -EFAULT;
4817 
4818         /* For UDP-style sockets, id specifies the association to query.  */
4819         asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4820         if (!asoc)
4821                 return -EINVAL;
4822 
4823         to = optval + offsetof(struct sctp_getaddrs, addrs);
4824         space_left = len - offsetof(struct sctp_getaddrs, addrs);
4825 
4826         list_for_each_entry(from, &asoc->peer.transport_addr_list,
4827                                 transports) {
4828                 memcpy(&temp, &from->ipaddr, sizeof(temp));
4829                 addrlen = sctp_get_pf_specific(sk->sk_family)
4830                               ->addr_to_user(sp, &temp);
4831                 if (space_left < addrlen)
4832                         return -ENOMEM;
4833                 if (copy_to_user(to, &temp, addrlen))
4834                         return -EFAULT;
4835                 to += addrlen;
4836                 cnt++;
4837                 space_left -= addrlen;
4838         }
4839 
4840         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4841                 return -EFAULT;
4842         bytes_copied = ((char __user *)to) - optval;
4843         if (put_user(bytes_copied, optlen))
4844                 return -EFAULT;
4845 
4846         return 0;
4847 }
4848 
4849 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4850                             size_t space_left, int *bytes_copied)
4851 {
4852         struct sctp_sockaddr_entry *addr;
4853         union sctp_addr temp;
4854         int cnt = 0;
4855         int addrlen;
4856         struct net *net = sock_net(sk);
4857 
4858         rcu_read_lock();
4859         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4860                 if (!addr->valid)
4861                         continue;
4862 
4863                 if ((PF_INET == sk->sk_family) &&
4864                     (AF_INET6 == addr->a.sa.sa_family))
4865                         continue;
4866                 if ((PF_INET6 == sk->sk_family) &&
4867                     inet_v6_ipv6only(sk) &&
4868                     (AF_INET == addr->a.sa.sa_family))
4869                         continue;
4870                 memcpy(&temp, &addr->a, sizeof(temp));
4871                 if (!temp.v4.sin_port)
4872                         temp.v4.sin_port = htons(port);
4873 
4874                 addrlen = sctp_get_pf_specific(sk->sk_family)
4875                               ->addr_to_user(sctp_sk(sk), &temp);
4876 
4877                 if (space_left < addrlen) {
4878                         cnt =  -ENOMEM;
4879                         break;
4880                 }
4881                 memcpy(to, &temp, addrlen);
4882 
4883                 to += addrlen;
4884                 cnt++;
4885                 space_left -= addrlen;
4886                 *bytes_copied += addrlen;
4887         }
4888         rcu_read_unlock();
4889 
4890         return cnt;
4891 }
4892 
4893 
4894 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4895                                        char __user *optval, int __user *optlen)
4896 {
4897         struct sctp_bind_addr *bp;
4898         struct sctp_association *asoc;
4899         int cnt = 0;
4900         struct sctp_getaddrs getaddrs;
4901         struct sctp_sockaddr_entry *addr;
4902         void __user *to;
4903         union sctp_addr temp;
4904         struct sctp_sock *sp = sctp_sk(sk);
4905         int addrlen;
4906         int err = 0;
4907         size_t space_left;
4908         int bytes_copied = 0;
4909         void *addrs;
4910         void *buf;
4911 
4912         if (len < sizeof(struct sctp_getaddrs))
4913                 return -EINVAL;
4914 
4915         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4916                 return -EFAULT;
4917 
4918         /*
4919          *  For UDP-style sockets, id specifies the association to query.
4920          *  If the id field is set to the value '' then the locally bound
4921          *  addresses are returned without regard to any particular
4922          *  association.
4923          */
4924         if (0 == getaddrs.assoc_id) {
4925                 bp = &sctp_sk(sk)->ep->base.bind_addr;
4926         } else {
4927                 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4928                 if (!asoc)
4929                         return -EINVAL;
4930                 bp = &asoc->base.bind_addr;
4931         }
4932 
4933         to = optval + offsetof(struct sctp_getaddrs, addrs);
4934         space_left = len - offsetof(struct sctp_getaddrs, addrs);
4935 
4936         addrs = kmalloc(space_left, GFP_KERNEL);
4937         if (!addrs)
4938                 return -ENOMEM;
4939 
4940         /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4941          * addresses from the global local address list.
4942          */
4943         if (sctp_list_single_entry(&bp->address_list)) {
4944                 addr = list_entry(bp->address_list.next,
4945                                   struct sctp_sockaddr_entry, list);
4946                 if (sctp_is_any(sk, &addr->a)) {
4947                         cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4948                                                 space_left, &bytes_copied);
4949                         if (cnt < 0) {
4950                                 err = cnt;
4951                                 goto out;
4952                         }
4953                         goto copy_getaddrs;
4954                 }
4955         }
4956 
4957         buf = addrs;
4958         /* Protection on the bound address list is not needed since
4959          * in the socket option context we hold a socket lock and
4960          * thus the bound address list can't change.
4961          */
4962         list_for_each_entry(addr, &bp->address_list, list) {
4963                 memcpy(&temp, &addr->a, sizeof(temp));
4964                 addrlen = sctp_get_pf_specific(sk->sk_family)
4965                               ->addr_to_user(sp, &temp);
4966                 if (space_left < addrlen) {
4967                         err =  -ENOMEM; /*fixme: right error?*/
4968                         goto out;
4969                 }
4970                 memcpy(buf, &temp, addrlen);
4971                 buf += addrlen;
4972                 bytes_copied += addrlen;
4973                 cnt++;
4974                 space_left -= addrlen;
4975         }
4976 
4977 copy_getaddrs:
4978         if (copy_to_user(to, addrs, bytes_copied)) {
4979                 err = -EFAULT;
4980                 goto out;
4981         }
4982         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4983                 err = -EFAULT;
4984                 goto out;
4985         }
4986         if (put_user(bytes_copied, optlen))
4987                 err = -EFAULT;
4988 out:
4989         kfree(addrs);
4990         return err;
4991 }
4992 
4993 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4994  *
4995  * Requests that the local SCTP stack use the enclosed peer address as
4996  * the association primary.  The enclosed address must be one of the
4997  * association peer's addresses.
4998  */
4999 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
5000                                         char __user *optval, int __user *optlen)
5001 {
5002         struct sctp_prim prim;
5003         struct sctp_association *asoc;
5004         struct sctp_sock *sp = sctp_sk(sk);
5005 
5006         if (len < sizeof(struct sctp_prim))
5007                 return -EINVAL;
5008 
5009         len = sizeof(struct sctp_prim);
5010 
5011         if (copy_from_user(&prim, optval, len))
5012                 return -EFAULT;
5013 
5014         asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5015         if (!asoc)
5016                 return -EINVAL;
5017 
5018         if (!asoc->peer.primary_path)
5019                 return -ENOTCONN;
5020 
5021         memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5022                 asoc->peer.primary_path->af_specific->sockaddr_len);
5023 
5024         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5025                         (union sctp_addr *)&prim.ssp_addr);
5026 
5027         if (put_user(len, optlen))
5028                 return -EFAULT;
5029         if (copy_to_user(optval, &prim, len))
5030                 return -EFAULT;
5031 
5032         return 0;
5033 }
5034 
5035 /*
5036  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5037  *
5038  * Requests that the local endpoint set the specified Adaptation Layer
5039  * Indication parameter for all future INIT and INIT-ACK exchanges.
5040  */
5041 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5042                                   char __user *optval, int __user *optlen)
5043 {
5044         struct sctp_setadaptation adaptation;
5045 
5046         if (len < sizeof(struct sctp_setadaptation))
5047                 return -EINVAL;
5048 
5049         len = sizeof(struct sctp_setadaptation);
5050 
5051         adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5052 
5053         if (put_user(len, optlen))
5054                 return -EFAULT;
5055         if (copy_to_user(optval, &adaptation, len))
5056                 return -EFAULT;
5057 
5058         return 0;
5059 }
5060 
5061 /*
5062  *
5063  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5064  *
5065  *   Applications that wish to use the sendto() system call may wish to
5066  *   specify a default set of parameters that would normally be supplied
5067  *   through the inclusion of ancillary data.  This socket option allows
5068  *   such an application to set the default sctp_sndrcvinfo structure.
5069 
5070 
5071  *   The application that wishes to use this socket option simply passes
5072  *   in to this call the sctp_sndrcvinfo structure defined in Section
5073  *   5.2.2) The input parameters accepted by this call include
5074  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5075  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
5076  *   to this call if the caller is using the UDP model.
5077  *
5078  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
5079  */
5080 static int sctp_getsockopt_default_send_param(struct sock *sk,
5081                                         int len, char __user *optval,
5082                                         int __user *optlen)
5083 {
5084         struct sctp_sock *sp = sctp_sk(sk);
5085         struct sctp_association *asoc;
5086         struct sctp_sndrcvinfo info;
5087 
5088         if (len < sizeof(info))
5089                 return -EINVAL;
5090 
5091         len = sizeof(info);
5092 
5093         if (copy_from_user(&info, optval, len))
5094                 return -EFAULT;
5095 
5096         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5097         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5098                 return -EINVAL;
5099         if (asoc) {
5100                 info.sinfo_stream = asoc->default_stream;
5101                 info.sinfo_flags = asoc->default_flags;
5102                 info.sinfo_ppid = asoc->default_ppid;
5103                 info.sinfo_context = asoc->default_context;
5104                 info.sinfo_timetolive = asoc->default_timetolive;
5105         } else {
5106                 info.sinfo_stream = sp->default_stream;
5107                 info.sinfo_flags = sp->default_flags;
5108                 info.sinfo_ppid = sp->default_ppid;
5109                 info.sinfo_context = sp->default_context;
5110                 info.sinfo_timetolive = sp->default_timetolive;
5111         }
5112 
5113         if (put_user(len, optlen))
5114                 return -EFAULT;
5115         if (copy_to_user(optval, &info, len))
5116                 return -EFAULT;
5117 
5118         return 0;
5119 }
5120 
5121 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5122  * (SCTP_DEFAULT_SNDINFO)
5123  */
5124 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5125                                            char __user *optval,
5126                                            int __user *optlen)
5127 {
5128         struct sctp_sock *sp = sctp_sk(sk);
5129         struct sctp_association *asoc;
5130         struct sctp_sndinfo info;
5131 
5132         if (len < sizeof(info))
5133                 return -EINVAL;
5134 
5135         len = sizeof(info);
5136 
5137         if (copy_from_user(&info, optval, len))
5138                 return -EFAULT;
5139 
5140         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5141         if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5142                 return -EINVAL;
5143         if (asoc) {
5144                 info.snd_sid = asoc->default_stream;
5145                 info.snd_flags = asoc->default_flags;
5146                 info.snd_ppid = asoc->default_ppid;
5147                 info.snd_context = asoc->default_context;
5148         } else {
5149                 info.snd_sid = sp->default_stream;
5150                 info.snd_flags = sp->default_flags;
5151                 info.snd_ppid = sp->default_ppid;
5152                 info.snd_context = sp->default_context;
5153         }
5154 
5155         if (put_user(len, optlen))
5156                 return -EFAULT;
5157         if (copy_to_user(optval, &info, len))
5158                 return -EFAULT;
5159 
5160         return 0;
5161 }
5162 
5163 /*
5164  *
5165  * 7.1.5 SCTP_NODELAY
5166  *
5167  * Turn on/off any Nagle-like algorithm.  This means that packets are
5168  * generally sent as soon as possible and no unnecessary delays are
5169  * introduced, at the cost of more packets in the network.  Expects an
5170  * integer boolean flag.
5171  */
5172 
5173 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5174                                    char __user *optval, int __user *optlen)
5175 {
5176         int val;
5177 
5178         if (len < sizeof(int))
5179                 return -EINVAL;
5180 
5181         len = sizeof(int);
5182         val = (sctp_sk(sk)->nodelay == 1);
5183         if (put_user(len, optlen))
5184                 return -EFAULT;
5185         if (copy_to_user(optval, &val, len))
5186                 return -EFAULT;
5187         return 0;
5188 }
5189 
5190 /*
5191  *
5192  * 7.1.1 SCTP_RTOINFO
5193  *
5194  * The protocol parameters used to initialize and bound retransmission
5195  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5196  * and modify these parameters.
5197  * All parameters are time values, in milliseconds.  A value of 0, when
5198  * modifying the parameters, indicates that the current value should not
5199  * be changed.
5200  *
5201  */
5202 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5203                                 char __user *optval,
5204                                 int __user *optlen) {
5205         struct sctp_rtoinfo rtoinfo;
5206         struct sctp_association *asoc;
5207 
5208         if (len < sizeof (struct sctp_rtoinfo))
5209                 return -EINVAL;
5210 
5211         len = sizeof(struct sctp_rtoinfo);
5212 
5213         if (copy_from_user(&rtoinfo, optval, len))
5214                 return -EFAULT;
5215 
5216         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5217 
5218         if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5219                 return -EINVAL;
5220 
5221         /* Values corresponding to the specific association. */
5222         if (asoc) {
5223                 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5224                 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5225                 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5226         } else {
5227                 /* Values corresponding to the endpoint. */
5228                 struct sctp_sock *sp = sctp_sk(sk);
5229 
5230                 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5231                 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5232                 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5233         }
5234 
5235         if (put_user(len, optlen))
5236                 return -EFAULT;
5237 
5238         if (copy_to_user(optval, &rtoinfo, len))
5239                 return -EFAULT;
5240 
5241         return 0;
5242 }
5243 
5244 /*
5245  *
5246  * 7.1.2 SCTP_ASSOCINFO
5247  *
5248  * This option is used to tune the maximum retransmission attempts
5249  * of the association.
5250  * Returns an error if the new association retransmission value is
5251  * greater than the sum of the retransmission value  of the peer.
5252  * See [SCTP] for more information.
5253  *
5254  */
5255 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5256                                      char __user *optval,
5257                                      int __user *optlen)
5258 {
5259 
5260         struct sctp_assocparams assocparams;
5261         struct sctp_association *asoc;
5262         struct list_head *pos;
5263         int cnt = 0;
5264 
5265         if (len < sizeof (struct sctp_assocparams))
5266                 return -EINVAL;
5267 
5268         len = sizeof(struct sctp_assocparams);
5269 
5270         if (copy_from_user(&assocparams, optval, len))
5271                 return -EFAULT;
5272 
5273         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5274 
5275         if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5276                 return -EINVAL;
5277 
5278         /* Values correspoinding to the specific association */
5279         if (asoc) {
5280                 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5281                 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5282                 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5283                 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5284 
5285                 list_for_each(pos, &asoc->peer.transport_addr_list) {
5286                         cnt++;
5287                 }
5288 
5289                 assocparams.sasoc_number_peer_destinations = cnt;
5290         } else {
5291                 /* Values corresponding to the endpoint */
5292                 struct sctp_sock *sp = sctp_sk(sk);
5293 
5294                 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5295                 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5296                 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5297                 assocparams.sasoc_cookie_life =
5298                                         sp->assocparams.sasoc_cookie_life;
5299                 assocparams.sasoc_number_peer_destinations =
5300                                         sp->assocparams.
5301                                         sasoc_number_peer_destinations;
5302         }
5303 
5304         if (put_user(len, optlen))
5305                 return -EFAULT;
5306 
5307         if (copy_to_user(optval, &assocparams, len))
5308                 return -EFAULT;
5309 
5310         return 0;
5311 }
5312 
5313 /*
5314  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5315  *
5316  * This socket option is a boolean flag which turns on or off mapped V4
5317  * addresses.  If this option is turned on and the socket is type
5318  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5319  * If this option is turned off, then no mapping will be done of V4
5320  * addresses and a user will receive both PF_INET6 and PF_INET type
5321  * addresses on the socket.
5322  */
5323 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5324                                     char __user *optval, int __user *optlen)
5325 {
5326         int val;
5327         struct sctp_sock *sp = sctp_sk(sk);
5328 
5329         if (len < sizeof(int))
5330                 return -EINVAL;
5331 
5332         len = sizeof(int);
5333         val = sp->v4mapped;
5334         if (put_user(len, optlen))
5335                 return -EFAULT;
5336         if (copy_to_user(optval, &val, len))
5337                 return -EFAULT;
5338 
5339         return 0;
5340 }
5341 
5342 /*
5343  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
5344  * (chapter and verse is quoted at sctp_setsockopt_context())
5345  */
5346 static int sctp_getsockopt_context(struct sock *sk, int len,
5347                                    char __user *optval, int __user *optlen)
5348 {
5349         struct sctp_assoc_value params;
5350         struct sctp_sock *sp;
5351         struct sctp_association *asoc;
5352 
5353         if (len < sizeof(struct sctp_assoc_value))
5354                 return -EINVAL;
5355 
5356         len = sizeof(struct sctp_assoc_value);
5357 
5358         if (copy_from_user(&params, optval, len))
5359                 return -EFAULT;
5360 
5361         sp = sctp_sk(sk);
5362 
5363         if (params.assoc_id != 0) {
5364                 asoc = sctp_id2assoc(sk, params.assoc_id);
5365                 if (!asoc)
5366                         return -EINVAL;
5367                 params.assoc_value = asoc->default_rcv_context;
5368         } else {
5369                 params.assoc_value = sp->default_rcv_context;
5370         }
5371 
5372         if (put_user(len, optlen))
5373                 return -EFAULT;
5374         if (copy_to_user(optval, &params, len))
5375                 return -EFAULT;
5376 
5377         return 0;
5378 }
5379 
5380 /*
5381  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5382  * This option will get or set the maximum size to put in any outgoing
5383  * SCTP DATA chunk.  If a message is larger than this size it will be
5384  * fragmented by SCTP into the specified size.  Note that the underlying
5385  * SCTP implementation may fragment into smaller sized chunks when the
5386  * PMTU of the underlying association is smaller than the value set by
5387  * the user.  The default value for this option is '' which indicates
5388  * the user is NOT limiting fragmentation and only the PMTU will effect
5389  * SCTP's choice of DATA chunk size.  Note also that values set larger
5390  * than the maximum size of an IP datagram will effectively let SCTP
5391  * control fragmentation (i.e. the same as setting this option to 0).
5392  *
5393  * The following structure is used to access and modify this parameter:
5394  *
5395  * struct sctp_assoc_value {
5396  *   sctp_assoc_t assoc_id;
5397  *   uint32_t assoc_value;
5398  * };
5399  *
5400  * assoc_id:  This parameter is ignored for one-to-one style sockets.
5401  *    For one-to-many style sockets this parameter indicates which
5402  *    association the user is performing an action upon.  Note that if
5403  *    this field's value is zero then the endpoints default value is
5404  *    changed (effecting future associations only).
5405  * assoc_value:  This parameter specifies the maximum size in bytes.
5406  */
5407 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5408                                   char __user *optval, int __user *optlen)
5409 {
5410         struct sctp_assoc_value params;
5411         struct sctp_association *asoc;
5412 
5413         if (len == sizeof(int)) {
5414                 pr_warn_ratelimited(DEPRECATED
5415                                     "%s (pid %d) "
5416                                     "Use of int in maxseg socket option.\n"
5417                                     "Use struct sctp_assoc_value instead\n",
5418                                     current->comm, task_pid_nr(current));
5419                 params.assoc_id = 0;
5420         } else if (len >= sizeof(struct sctp_assoc_value)) {
5421                 len = sizeof(struct sctp_assoc_value);
5422                 if (copy_from_user(&params, optval, sizeof(params)))
5423                         return -EFAULT;
5424         } else
5425                 return -EINVAL;
5426 
5427         asoc = sctp_id2assoc(sk, params.assoc_id);
5428         if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5429                 return -EINVAL;
5430 
5431         if (asoc)
5432                 params.assoc_value = asoc->frag_point;
5433         else
5434                 params.assoc_value = sctp_sk(sk)->user_frag;
5435 
5436         if (put_user(len, optlen))
5437                 return -EFAULT;
5438         if (len == sizeof(int)) {
5439                 if (copy_to_user(optval, &params.assoc_value, len))
5440                         return -EFAULT;
5441         } else {
5442                 if (copy_to_user(optval, &params, len))
5443                         return -EFAULT;
5444         }
5445 
5446         return 0;
5447 }
5448 
5449 /*
5450  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5451  * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5452  */
5453 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5454                                                char __user *optval, int __user *optlen)
5455 {
5456         int val;
5457 
5458         if (len < sizeof(int))
5459                 return -EINVAL;
5460 
5461         len = sizeof(int);
5462 
5463         val = sctp_sk(sk)->frag_interleave;
5464         if (put_user(len, optlen))
5465                 return -EFAULT;
5466         if (copy_to_user(optval, &val, len))
5467                 return -EFAULT;
5468 
5469         return 0;
5470 }
5471 
5472 /*
5473  * 7.1.25.  Set or Get the sctp partial delivery point
5474  * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5475  */
5476 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5477                                                   char __user *optval,
5478                                                   int __user *optlen)
5479 {
5480         u32 val;
5481 
5482         if (len < sizeof(u32))
5483                 return -EINVAL;
5484 
5485         len = sizeof(u32);
5486 
5487         val = sctp_sk(sk)->pd_point;
5488         if (put_user(len, optlen))
5489                 return -EFAULT;
5490         if (copy_to_user(optval, &val, len))
5491                 return -EFAULT;
5492 
5493         return 0;
5494 }
5495 
5496 /*
5497  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
5498  * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5499  */
5500 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5501                                     char __user *optval,
5502                                     int __user *optlen)
5503 {
5504         struct sctp_assoc_value params;
5505         struct sctp_sock *sp;
5506         struct sctp_association *asoc;
5507 
5508         if (len == sizeof(int)) {
5509                 pr_warn_ratelimited(DEPRECATED
5510                                     "%s (pid %d) "
5511                                     "Use of int in max_burst socket option.\n"
5512                                     "Use struct sctp_assoc_value instead\n",
5513                                     current->comm, task_pid_nr(current));
5514                 params.assoc_id = 0;
5515         } else if (len >= sizeof(struct sctp_assoc_value)) {
5516                 len = sizeof(struct sctp_assoc_value);
5517                 if (copy_from_user(&params, optval, len))
5518                         return -EFAULT;
5519         } else
5520                 return -EINVAL;
5521 
5522         sp = sctp_sk(sk);
5523 
5524         if (params.assoc_id != 0) {
5525                 asoc = sctp_id2assoc(sk, params.assoc_id);
5526                 if (!asoc)
5527                         return -EINVAL;
5528                 params.assoc_value = asoc->max_burst;
5529         } else
5530                 params.assoc_value = sp->max_burst;
5531 
5532         if (len == sizeof(int)) {
5533                 if (copy_to_user(optval, &params.assoc_value, len))
5534                         return -EFAULT;
5535         } else {
5536                 if (copy_to_user(optval, &params, len))
5537                         return -EFAULT;
5538         }
5539 
5540         return 0;
5541 
5542 }
5543 
5544 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5545                                     char __user *optval, int __user *optlen)
5546 {
5547         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5548         struct sctp_hmacalgo  __user *p = (void __user *)optval;
5549         struct sctp_hmac_algo_param *hmacs;
5550         __u16 data_len = 0;
5551         u32 num_idents;
5552 
5553         if (!ep->auth_enable)
5554                 return -EACCES;
5555 
5556         hmacs = ep->auth_hmacs_list;
5557         data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5558 
5559         if (len < sizeof(struct sctp_hmacalgo) + data_len)
5560                 return -EINVAL;
5561 
5562         len = sizeof(struct sctp_hmacalgo) + data_len;
5563         num_idents = data_len / sizeof(u16);
5564 
5565         if (put_user(len, optlen))
5566                 return -EFAULT;
5567         if (put_user(num_idents, &p->shmac_num_idents))
5568                 return -EFAULT;
5569         if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5570                 return -EFAULT;
5571         return 0;
5572 }
5573 
5574 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5575                                     char __user *optval, int __user *optlen)
5576 {
5577         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5578         struct sctp_authkeyid val;
5579         struct sctp_association *asoc;
5580 
5581         if (!ep->auth_enable)
5582                 return -EACCES;
5583 
5584         if (len < sizeof(struct sctp_authkeyid))
5585                 return -EINVAL;
5586         if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5587                 return -EFAULT;
5588 
5589         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5590         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5591                 return -EINVAL;
5592 
5593         if (asoc)
5594                 val.scact_keynumber = asoc->active_key_id;
5595         else
5596                 val.scact_keynumber = ep->active_key_id;
5597 
5598         len = sizeof(struct sctp_authkeyid);
5599         if (put_user(len, optlen))
5600                 return -EFAULT;
5601         if (copy_to_user(optval, &val, len))
5602                 return -EFAULT;
5603 
5604         return 0;
5605 }
5606 
5607 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5608                                     char __user *optval, int __user *optlen)
5609 {
5610         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5611         struct sctp_authchunks __user *p = (void __user *)optval;
5612         struct sctp_authchunks val;
5613         struct sctp_association *asoc;
5614         struct sctp_chunks_param *ch;
5615         u32    num_chunks = 0;
5616         char __user *to;
5617 
5618         if (!ep->auth_enable)
5619                 return -EACCES;
5620 
5621         if (len < sizeof(struct sctp_authchunks))
5622                 return -EINVAL;
5623 
5624         if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5625                 return -EFAULT;
5626 
5627         to = p->gauth_chunks;
5628         asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5629         if (!asoc)
5630                 return -EINVAL;
5631 
5632         ch = asoc->peer.peer_chunks;
5633         if (!ch)
5634                 goto num;
5635 
5636         /* See if the user provided enough room for all the data */
5637         num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5638         if (len < num_chunks)
5639                 return -EINVAL;
5640 
5641         if (copy_to_user(to, ch->chunks, num_chunks))
5642                 return -EFAULT;
5643 num:
5644         len = sizeof(struct sctp_authchunks) + num_chunks;
5645         if (put_user(len, optlen))
5646                 return -EFAULT;
5647         if (put_user(num_chunks, &p->gauth_number_of_chunks))
5648                 return -EFAULT;
5649         return 0;
5650 }
5651 
5652 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5653                                     char __user *optval, int __user *optlen)
5654 {
5655         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5656         struct sctp_authchunks __user *p = (void __user *)optval;
5657         struct sctp_authchunks val;
5658         struct sctp_association *asoc;
5659         struct sctp_chunks_param *ch;
5660         u32    num_chunks = 0;
5661         char __user *to;
5662 
5663         if (!ep->auth_enable)
5664                 return -EACCES;
5665 
5666         if (len < sizeof(struct sctp_authchunks))
5667                 return -EINVAL;
5668 
5669         if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5670                 return -EFAULT;
5671 
5672         to = p->gauth_chunks;
5673         asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5674         if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5675                 return -EINVAL;
5676 
5677         if (asoc)
5678                 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5679         else
5680                 ch = ep->auth_chunk_list;
5681 
5682         if (!ch)
5683                 goto num;
5684 
5685         num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5686         if (len < sizeof(struct sctp_authchunks) + num_chunks)
5687                 return -EINVAL;
5688 
5689         if (copy_to_user(to, ch->chunks, num_chunks))
5690                 return -EFAULT;
5691 num:
5692         len = sizeof(struct sctp_authchunks) + num_chunks;
5693         if (put_user(len, optlen))
5694                 return -EFAULT;
5695         if (put_user(num_chunks, &p->gauth_number_of_chunks))
5696                 return -EFAULT;
5697 
5698         return 0;
5699 }
5700 
5701 /*
5702  * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5703  * This option gets the current number of associations that are attached
5704  * to a one-to-many style socket.  The option value is an uint32_t.
5705  */
5706 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5707                                     char __user *optval, int __user *optlen)
5708 {
5709         struct sctp_sock *sp = sctp_sk(sk);
5710         struct sctp_association *asoc;
5711         u32 val = 0;
5712 
5713         if (sctp_style(sk, TCP))
5714                 return -EOPNOTSUPP;
5715 
5716         if (len < sizeof(u32))
5717                 return -EINVAL;
5718 
5719         len = sizeof(u32);
5720 
5721         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5722                 val++;
5723         }
5724 
5725         if (put_user(len, optlen))
5726                 return -EFAULT;
5727         if (copy_to_user(optval, &val, len))
5728                 return -EFAULT;
5729 
5730         return 0;
5731 }
5732 
5733 /*
5734  * 8.1.23 SCTP_AUTO_ASCONF
5735  * See the corresponding setsockopt entry as description
5736  */
5737 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5738                                    char __user *optval, int __user *optlen)
5739 {
5740         int val = 0;
5741 
5742         if (len < sizeof(int))
5743                 return -EINVAL;
5744 
5745         len = sizeof(int);
5746         if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5747                 val = 1;
5748         if (put_user(len, optlen))
5749                 return -EFAULT;
5750         if (copy_to_user(optval, &val, len))
5751                 return -EFAULT;
5752         return 0;
5753 }
5754 
5755 /*
5756  * 8.2.6. Get the Current Identifiers of Associations
5757  *        (SCTP_GET_ASSOC_ID_LIST)
5758  *
5759  * This option gets the current list of SCTP association identifiers of
5760  * the SCTP associations handled by a one-to-many style socket.
5761  */
5762 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5763                                     char __user *optval, int __user *optlen)
5764 {
5765         struct sctp_sock *sp = sctp_sk(sk);
5766         struct sctp_association *asoc;
5767         struct sctp_assoc_ids *ids;
5768         u32 num = 0;
5769 
5770         if (sctp_style(sk, TCP))
5771                 return -EOPNOTSUPP;
5772 
5773         if (len < sizeof(struct sctp_assoc_ids))
5774                 return -EINVAL;
5775 
5776         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5777                 num++;
5778         }
5779 
5780         if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5781                 return -EINVAL;
5782 
5783         len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5784 
5785         ids = kmalloc(len, GFP_KERNEL);
5786         if (unlikely(!ids))
5787                 return -ENOMEM;
5788 
5789         ids->gaids_number_of_ids = num;
5790         num = 0;
5791         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5792                 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5793         }
5794 
5795         if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5796                 kfree(ids);
5797                 return -EFAULT;
5798         }
5799 
5800         kfree(ids);
5801         return 0;
5802 }
5803 
5804 /*
5805  * SCTP_PEER_ADDR_THLDS
5806  *
5807  * This option allows us to fetch the partially failed threshold for one or all
5808  * transports in an association.  See Section 6.1 of:
5809  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5810  */
5811 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5812                                             char __user *optval,
5813                                             int len,
5814                                             int __user *optlen)
5815 {
5816         struct sctp_paddrthlds val;
5817         struct sctp_transport *trans;
5818         struct sctp_association *asoc;
5819 
5820         if (len < sizeof(struct sctp_paddrthlds))
5821                 return -EINVAL;
5822         len = sizeof(struct sctp_paddrthlds);
5823         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5824                 return -EFAULT;
5825 
5826         if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5827                 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5828                 if (!asoc)
5829                         return -ENOENT;
5830 
5831                 val.spt_pathpfthld = asoc->pf_retrans;
5832                 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5833         } else {
5834                 trans = sctp_addr_id2transport(sk, &val.spt_address,
5835                                                val.spt_assoc_id);
5836                 if (!trans)
5837                         return -ENOENT;
5838 
5839                 val.spt_pathmaxrxt = trans->pathmaxrxt;
5840                 val.spt_pathpfthld = trans->pf_retrans;
5841         }
5842 
5843         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5844                 return -EFAULT;
5845 
5846         return 0;
5847 }
5848 
5849 /*
5850  * SCTP_GET_ASSOC_STATS
5851  *
5852  * This option retrieves local per endpoint statistics. It is modeled
5853  * after OpenSolaris' implementation
5854  */
5855 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5856                                        char __user *optval,
5857                                        int __user *optlen)
5858 {
5859         struct sctp_assoc_stats sas;
5860         struct sctp_association *asoc = NULL;
5861 
5862         /* User must provide at least the assoc id */
5863         if (len < sizeof(sctp_assoc_t))
5864                 return -EINVAL;
5865 
5866         /* Allow the struct to grow and fill in as much as possible */
5867         len = min_t(size_t, len, sizeof(sas));
5868 
5869         if (copy_from_user(&sas, optval, len))
5870                 return -EFAULT;
5871 
5872         asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5873         if (!asoc)
5874                 return -EINVAL;
5875 
5876         sas.sas_rtxchunks = asoc->stats.rtxchunks;
5877         sas.sas_gapcnt = asoc->stats.gapcnt;
5878         sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5879         sas.sas_osacks = asoc->stats.osacks;
5880         sas.sas_isacks = asoc->stats.isacks;
5881         sas.sas_octrlchunks = asoc->stats.octrlchunks;
5882         sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5883         sas.sas_oodchunks = asoc->stats.oodchunks;
5884         sas.sas_iodchunks = asoc->stats.iodchunks;
5885         sas.sas_ouodchunks = asoc->stats.ouodchunks;
5886         sas.sas_iuodchunks = asoc->stats.iuodchunks;
5887         sas.sas_idupchunks = asoc->stats.idupchunks;
5888         sas.sas_opackets = asoc->stats.opackets;
5889         sas.sas_ipackets = asoc->stats.ipackets;
5890 
5891         /* New high max rto observed, will return 0 if not a single
5892          * RTO update took place. obs_rto_ipaddr will be bogus
5893          * in such a case
5894          */
5895         sas.sas_maxrto = asoc->stats.max_obs_rto;
5896         memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5897                 sizeof(struct sockaddr_storage));
5898 
5899         /* Mark beginning of a new observation period */
5900         asoc->stats.max_obs_rto = asoc->rto_min;
5901 
5902         if (put_user(len, optlen))
5903                 return -EFAULT;
5904 
5905         pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5906 
5907         if (copy_to_user(optval, &sas, len))
5908                 return -EFAULT;
5909 
5910         return 0;
5911 }
5912 
5913 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5914                                        char __user *optval,
5915                                        int __user *optlen)
5916 {
5917         int val = 0;
5918 
5919         if (len < sizeof(int))
5920                 return -EINVAL;
5921 
5922         len = sizeof(int);
5923         if (sctp_sk(sk)->recvrcvinfo)
5924                 val = 1;
5925         if (put_user(len, optlen))
5926                 return -EFAULT;
5927         if (copy_to_user(optval, &val, len))
5928                 return -EFAULT;
5929 
5930         return 0;
5931 }
5932 
5933 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5934                                        char __user *optval,
5935                                        int __user *optlen)
5936 {
5937         int val = 0;
5938 
5939         if (len < sizeof(int))
5940                 return -EINVAL;
5941 
5942         len = sizeof(int);
5943         if (sctp_sk(sk)->recvnxtinfo)
5944                 val = 1;
5945         if (put_user(len, optlen))
5946                 return -EFAULT;
5947         if (copy_to_user(optval, &val, len))
5948                 return -EFAULT;
5949 
5950         return 0;
5951 }
5952 
5953 static int sctp_getsockopt(struct sock *sk, int level, int optname,
5954                            char __user *optval, int __user *optlen)
5955 {
5956         int retval = 0;
5957         int len;
5958 
5959         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
5960 
5961         /* I can hardly begin to describe how wrong this is.  This is
5962          * so broken as to be worse than useless.  The API draft
5963          * REALLY is NOT helpful here...  I am not convinced that the
5964          * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5965          * are at all well-founded.
5966          */
5967         if (level != SOL_SCTP) {
5968                 struct sctp_af *af = sctp_sk(sk)->pf->af;
5969 
5970                 retval = af->getsockopt(sk, level, optname, optval, optlen);
5971                 return retval;
5972         }
5973 
5974         if (get_user(len, optlen))
5975                 return -EFAULT;
5976 
5977         lock_sock(sk);
5978 
5979         switch (optname) {
5980         case SCTP_STATUS:
5981                 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5982                 break;
5983         case SCTP_DISABLE_FRAGMENTS:
5984                 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5985                                                            optlen);
5986                 break;
5987         case SCTP_EVENTS:
5988                 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5989                 break;
5990         case SCTP_AUTOCLOSE:
5991                 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5992                 break;
5993         case SCTP_SOCKOPT_PEELOFF:
5994                 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5995                 break;
5996         case SCTP_PEER_ADDR_PARAMS:
5997                 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5998                                                           optlen);
5999                 break;
6000         case SCTP_DELAYED_SACK:
6001                 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
6002                                                           optlen);
6003                 break;
6004         case SCTP_INITMSG:
6005                 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6006                 break;
6007         case SCTP_GET_PEER_ADDRS:
6008                 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6009                                                     optlen);
6010                 break;
6011         case SCTP_GET_LOCAL_ADDRS:
6012                 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6013                                                      optlen);
6014                 break;
6015         case SCTP_SOCKOPT_CONNECTX3:
6016                 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6017                 break;
6018         case SCTP_DEFAULT_SEND_PARAM:
6019                 retval = sctp_getsockopt_default_send_param(sk, len,
6020                                                             optval, optlen);
6021                 break;
6022         case SCTP_DEFAULT_SNDINFO:
6023                 retval = sctp_getsockopt_default_sndinfo(sk, len,
6024                                                          optval, optlen);
6025                 break;
6026         case SCTP_PRIMARY_ADDR:
6027                 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6028                 break;
6029         case SCTP_NODELAY:
6030                 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6031                 break;
6032         case SCTP_RTOINFO:
6033                 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6034                 break;
6035         case SCTP_ASSOCINFO:
6036                 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6037                 break;
6038         case SCTP_I_WANT_MAPPED_V4_ADDR:
6039                 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6040                 break;
6041         case SCTP_MAXSEG:
6042                 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6043                 break;
6044         case SCTP_GET_PEER_ADDR_INFO:
6045                 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6046                                                         optlen);
6047                 break;
6048         case SCTP_ADAPTATION_LAYER:
6049                 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6050                                                         optlen);
6051                 break;
6052         case SCTP_CONTEXT:
6053                 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6054                 break;
6055         case SCTP_FRAGMENT_INTERLEAVE:
6056                 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6057                                                              optlen);
6058                 break;
6059         case SCTP_PARTIAL_DELIVERY_POINT:
6060                 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6061                                                                 optlen);
6062                 break;
6063         case SCTP_MAX_BURST:
6064                 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6065                 break;
6066         case SCTP_AUTH_KEY:
6067         case SCTP_AUTH_CHUNK:
6068         case SCTP_AUTH_DELETE_KEY:
6069                 retval = -EOPNOTSUPP;
6070                 break;
6071         case SCTP_HMAC_IDENT:
6072                 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6073                 break;
6074         case SCTP_AUTH_ACTIVE_KEY:
6075                 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6076                 break;
6077         case SCTP_PEER_AUTH_CHUNKS:
6078                 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6079                                                         optlen);
6080                 break;
6081         case SCTP_LOCAL_AUTH_CHUNKS:
6082                 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6083                                                         optlen);
6084                 break;
6085         case SCTP_GET_ASSOC_NUMBER:
6086                 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6087                 break;
6088         case SCTP_GET_ASSOC_ID_LIST:
6089                 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6090                 break;
6091         case SCTP_AUTO_ASCONF:
6092                 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6093                 break;
6094         case SCTP_PEER_ADDR_THLDS:
6095                 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6096                 break;
6097         case SCTP_GET_ASSOC_STATS:
6098                 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6099                 break;
6100         case SCTP_RECVRCVINFO:
6101                 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6102                 break;
6103         case SCTP_RECVNXTINFO:
6104                 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6105                 break;
6106         default:
6107                 retval = -ENOPROTOOPT;
6108                 break;
6109         }
6110 
6111         release_sock(sk);
6112         return retval;
6113 }
6114 
6115 static void sctp_hash(struct sock *sk)
6116 {
6117         /* STUB */
6118 }
6119 
6120 static void sctp_unhash(struct sock *sk)
6121 {
6122         /* STUB */
6123 }
6124 
6125 /* Check if port is acceptable.  Possibly find first available port.
6126  *
6127  * The port hash table (contained in the 'global' SCTP protocol storage
6128  * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6129  * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6130  * list (the list number is the port number hashed out, so as you
6131  * would expect from a hash function, all the ports in a given list have
6132  * such a number that hashes out to the same list number; you were
6133  * expecting that, right?); so each list has a set of ports, with a
6134  * link to the socket (struct sock) that uses it, the port number and
6135  * a fastreuse flag (FIXME: NPI ipg).
6136  */
6137 static struct sctp_bind_bucket *sctp_bucket_create(
6138         struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6139 
6140 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6141 {
6142         struct sctp_bind_hashbucket *head; /* hash list */
6143         struct sctp_bind_bucket *pp;
6144         unsigned short snum;
6145         int ret;
6146 
6147         snum = ntohs(addr->v4.sin_port);
6148 
6149         pr_debug("%s: begins, snum:%d\n", __func__, snum);
6150 
6151         local_bh_disable();
6152 
6153         if (snum == 0) {
6154                 /* Search for an available port. */
6155                 int low, high, remaining, index;
6156                 unsigned int rover;
6157                 struct net *net = sock_net(sk);
6158 
6159                 inet_get_local_port_range(net, &low, &high);
6160                 remaining = (high - low) + 1;
6161                 rover = prandom_u32() % remaining + low;
6162 
6163                 do {
6164                         rover++;
6165                         if ((rover < low) || (rover > high))
6166                                 rover = low;
6167                         if (inet_is_local_reserved_port(net, rover))
6168                                 continue;
6169                         index = sctp_phashfn(sock_net(sk), rover);
6170                         head = &sctp_port_hashtable[index];
6171                         spin_lock(&head->lock);
6172                         sctp_for_each_hentry(pp, &head->chain)
6173                                 if ((pp->port == rover) &&
6174                                     net_eq(sock_net(sk), pp->net))
6175                                         goto next;
6176                         break;
6177                 next:
6178                         spin_unlock(&head->lock);
6179                 } while (--remaining > 0);
6180 
6181                 /* Exhausted local port range during search? */
6182                 ret = 1;
6183                 if (remaining <= 0)
6184                         goto fail;
6185 
6186                 /* OK, here is the one we will use.  HEAD (the port
6187                  * hash table list entry) is non-NULL and we hold it's
6188                  * mutex.
6189                  */
6190                 snum = rover;
6191         } else {
6192                 /* We are given an specific port number; we verify
6193                  * that it is not being used. If it is used, we will
6194                  * exahust the search in the hash list corresponding
6195                  * to the port number (snum) - we detect that with the
6196                  * port iterator, pp being NULL.
6197                  */
6198                 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6199                 spin_lock(&head->lock);
6200                 sctp_for_each_hentry(pp, &head->chain) {
6201                         if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6202                                 goto pp_found;
6203                 }
6204         }
6205         pp = NULL;
6206         goto pp_not_found;
6207 pp_found:
6208         if (!hlist_empty(&pp->owner)) {
6209                 /* We had a port hash table hit - there is an
6210                  * available port (pp != NULL) and it is being
6211                  * used by other socket (pp->owner not empty); that other
6212                  * socket is going to be sk2.
6213                  */
6214                 int reuse = sk->sk_reuse;
6215                 struct sock *sk2;
6216 
6217                 pr_debug("%s: found a possible match\n", __func__);
6218 
6219                 if (pp->fastreuse && sk->sk_reuse &&
6220                         sk->sk_state != SCTP_SS_LISTENING)
6221                         goto success;
6222 
6223                 /* Run through the list of sockets bound to the port
6224                  * (pp->port) [via the pointers bind_next and
6225                  * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6226                  * we get the endpoint they describe and run through
6227                  * the endpoint's list of IP (v4 or v6) addresses,
6228                  * comparing each of the addresses with the address of
6229                  * the socket sk. If we find a match, then that means
6230                  * that this port/socket (sk) combination are already
6231                  * in an endpoint.
6232                  */
6233                 sk_for_each_bound(sk2, &pp->owner) {
6234                         struct sctp_endpoint *ep2;
6235                         ep2 = sctp_sk(sk2)->ep;
6236 
6237                         if (sk == sk2 ||
6238                             (reuse && sk2->sk_reuse &&
6239                              sk2->sk_state != SCTP_SS_LISTENING))
6240                                 continue;
6241 
6242                         if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6243                                                  sctp_sk(sk2), sctp_sk(sk))) {
6244                                 ret = (long)sk2;
6245                                 goto fail_unlock;
6246                         }
6247                 }
6248 
6249                 pr_debug("%s: found a match\n", __func__);
6250         }
6251 pp_not_found:
6252         /* If there was a hash table miss, create a new port.  */
6253         ret = 1;
6254         if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6255                 goto fail_unlock;
6256 
6257         /* In either case (hit or miss), make sure fastreuse is 1 only
6258          * if sk->sk_reuse is too (that is, if the caller requested
6259          * SO_REUSEADDR on this socket -sk-).
6260          */
6261         if (hlist_empty(&pp->owner)) {
6262                 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6263                         pp->fastreuse = 1;
6264                 else
6265                         pp->fastreuse = 0;
6266         } else if (pp->fastreuse &&
6267                 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6268                 pp->fastreuse = 0;
6269 
6270         /* We are set, so fill up all the data in the hash table
6271          * entry, tie the socket list information with the rest of the
6272          * sockets FIXME: Blurry, NPI (ipg).
6273          */
6274 success:
6275         if (!sctp_sk(sk)->bind_hash) {
6276                 inet_sk(sk)->inet_num = snum;
6277                 sk_add_bind_node(sk, &pp->owner);
6278                 sctp_sk(sk)->bind_hash = pp;
6279         }
6280         ret = 0;
6281 
6282 fail_unlock:
6283         spin_unlock(&head->lock);
6284 
6285 fail:
6286         local_bh_enable();
6287         return ret;
6288 }
6289 
6290 /* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
6291  * port is requested.
6292  */
6293 static int sctp_get_port(struct sock *sk, unsigned short snum)
6294 {
6295         union sctp_addr addr;
6296         struct sctp_af *af = sctp_sk(sk)->pf->af;
6297 
6298         /* Set up a dummy address struct from the sk. */
6299         af->from_sk(&addr, sk);
6300         addr.v4.sin_port = htons(snum);
6301 
6302         /* Note: sk->sk_num gets filled in if ephemeral port request. */
6303         return !!sctp_get_port_local(sk, &addr);
6304 }
6305 
6306 /*
6307  *  Move a socket to LISTENING state.
6308  */
6309 static int sctp_listen_start(struct sock *sk, int backlog)
6310 {
6311         struct sctp_sock *sp = sctp_sk(sk);
6312         struct sctp_endpoint *ep = sp->ep;
6313         struct crypto_hash *tfm = NULL;
6314         char alg[32];
6315 
6316         /* Allocate HMAC for generating cookie. */
6317         if (!sp->hmac && sp->sctp_hmac_alg) {
6318                 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6319                 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6320                 if (IS_ERR(tfm)) {
6321                         net_info_ratelimited("failed to load transform for %s: %ld\n",
6322                                              sp->sctp_hmac_alg, PTR_ERR(tfm));
6323                         return -ENOSYS;
6324                 }
6325                 sctp_sk(sk)->hmac = tfm;
6326         }
6327 
6328         /*
6329          * If a bind() or sctp_bindx() is not called prior to a listen()
6330          * call that allows new associations to be accepted, the system
6331          * picks an ephemeral port and will choose an address set equivalent
6332          * to binding with a wildcard address.
6333          *
6334          * This is not currently spelled out in the SCTP sockets
6335          * extensions draft, but follows the practice as seen in TCP
6336          * sockets.
6337          *
6338          */
6339         sk->sk_state = SCTP_SS_LISTENING;
6340         if (!ep->base.bind_addr.port) {
6341                 if (sctp_autobind(sk))
6342                         return -EAGAIN;
6343         } else {
6344                 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6345                         sk->sk_state = SCTP_SS_CLOSED;
6346                         return -EADDRINUSE;
6347                 }
6348         }
6349 
6350         sk->sk_max_ack_backlog = backlog;
6351         sctp_hash_endpoint(ep);
6352         return 0;
6353 }
6354 
6355 /*
6356  * 4.1.3 / 5.1.3 listen()
6357  *
6358  *   By default, new associations are not accepted for UDP style sockets.
6359  *   An application uses listen() to mark a socket as being able to
6360  *   accept new associations.
6361  *
6362  *   On TCP style sockets, applications use listen() to ready the SCTP
6363  *   endpoint for accepting inbound associations.
6364  *
6365  *   On both types of endpoints a backlog of '' disables listening.
6366  *
6367  *  Move a socket to LISTENING state.
6368  */
6369 int sctp_inet_listen(struct socket *sock, int backlog)
6370 {
6371         struct sock *sk = sock->sk;
6372         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6373         int err = -EINVAL;
6374 
6375         if (unlikely(backlog < 0))
6376                 return err;
6377 
6378         lock_sock(sk);
6379 
6380         /* Peeled-off sockets are not allowed to listen().  */
6381         if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6382                 goto out;
6383 
6384         if (sock->state != SS_UNCONNECTED)
6385                 goto out;
6386 
6387         /* If backlog is zero, disable listening. */
6388         if (!backlog) {
6389                 if (sctp_sstate(sk, CLOSED))
6390                         goto out;
6391 
6392                 err = 0;
6393                 sctp_unhash_endpoint(ep);
6394                 sk->sk_state = SCTP_SS_CLOSED;
6395                 if (sk->sk_reuse)
6396                         sctp_sk(sk)->bind_hash->fastreuse = 1;
6397                 goto out;
6398         }
6399 
6400         /* If we are already listening, just update the backlog */
6401         if (sctp_sstate(sk, LISTENING))
6402                 sk->sk_max_ack_backlog = backlog;
6403         else {
6404                 err = sctp_listen_start(sk, backlog);
6405                 if (err)
6406                         goto out;
6407         }
6408 
6409         err = 0;
6410 out:
6411         release_sock(sk);
6412         return err;
6413 }
6414 
6415 /*
6416  * This function is done by modeling the current datagram_poll() and the
6417  * tcp_poll().  Note that, based on these implementations, we don't
6418  * lock the socket in this function, even though it seems that,
6419  * ideally, locking or some other mechanisms can be used to ensure
6420  * the integrity of the counters (sndbuf and wmem_alloc) used
6421  * in this place.  We assume that we don't need locks either until proven
6422  * otherwise.
6423  *
6424  * Another thing to note is that we include the Async I/O support
6425  * here, again, by modeling the current TCP/UDP code.  We don't have
6426  * a good way to test with it yet.
6427  */
6428 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6429 {
6430         struct sock *sk = sock->sk;
6431         struct sctp_sock *sp = sctp_sk(sk);
6432         unsigned int mask;
6433 
6434         poll_wait(file, sk_sleep(sk), wait);
6435 
6436         /* A TCP-style listening socket becomes readable when the accept queue
6437          * is not empty.
6438          */
6439         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6440                 return (!list_empty(&sp->ep->asocs)) ?
6441                         (POLLIN | POLLRDNORM) : 0;
6442 
6443         mask = 0;
6444 
6445         /* Is there any exceptional events?  */
6446         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6447                 mask |= POLLERR |
6448                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6449         if (sk->sk_shutdown & RCV_SHUTDOWN)
6450                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6451         if (sk->sk_shutdown == SHUTDOWN_MASK)
6452                 mask |= POLLHUP;
6453 
6454         /* Is it readable?  Reconsider this code with TCP-style support.  */
6455         if (!skb_queue_empty(&sk->sk_receive_queue))
6456                 mask |= POLLIN | POLLRDNORM;
6457 
6458         /* The association is either gone or not ready.  */
6459         if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6460                 return mask;
6461 
6462         /* Is it writable?  */
6463         if (sctp_writeable(sk)) {
6464                 mask |= POLLOUT | POLLWRNORM;
6465         } else {
6466                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6467                 /*
6468                  * Since the socket is not locked, the buffer
6469                  * might be made available after the writeable check and
6470                  * before the bit is set.  This could cause a lost I/O
6471                  * signal.  tcp_poll() has a race breaker for this race
6472                  * condition.  Based on their implementation, we put
6473                  * in the following code to cover it as well.
6474                  */
6475                 if (sctp_writeable(sk))
6476                         mask |= POLLOUT | POLLWRNORM;
6477         }
6478         return mask;
6479 }
6480 
6481 /********************************************************************
6482  * 2nd Level Abstractions
6483  ********************************************************************/
6484 
6485 static struct sctp_bind_bucket *sctp_bucket_create(
6486         struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6487 {
6488         struct sctp_bind_bucket *pp;
6489 
6490         pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6491         if (pp) {
6492                 SCTP_DBG_OBJCNT_INC(bind_bucket);
6493                 pp->port = snum;
6494                 pp->fastreuse = 0;
6495                 INIT_HLIST_HEAD(&pp->owner);
6496                 pp->net = net;
6497                 hlist_add_head(&pp->node, &head->chain);
6498         }
6499         return pp;
6500 }
6501 
6502 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6503 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6504 {
6505         if (pp && hlist_empty(&pp->owner)) {
6506                 __hlist_del(&pp->node);
6507                 kmem_cache_free(sctp_bucket_cachep, pp);
6508                 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6509         }
6510 }
6511 
6512 /* Release this socket's reference to a local port.  */
6513 static inline void __sctp_put_port(struct sock *sk)
6514 {
6515         struct sctp_bind_hashbucket *head =
6516                 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6517                                                   inet_sk(sk)->inet_num)];
6518         struct sctp_bind_bucket *pp;
6519 
6520         spin_lock(&head->lock);
6521         pp = sctp_sk(sk)->bind_hash;
6522         __sk_del_bind_node(sk);
6523         sctp_sk(sk)->bind_hash = NULL;
6524         inet_sk(sk)->inet_num = 0;
6525         sctp_bucket_destroy(pp);
6526         spin_unlock(&head->lock);
6527 }
6528 
6529 void sctp_put_port(struct sock *sk)
6530 {
6531         local_bh_disable();
6532         __sctp_put_port(sk);
6533         local_bh_enable();
6534 }
6535 
6536 /*
6537  * The system picks an ephemeral port and choose an address set equivalent
6538  * to binding with a wildcard address.
6539  * One of those addresses will be the primary address for the association.
6540  * This automatically enables the multihoming capability of SCTP.
6541  */
6542 static int sctp_autobind(struct sock *sk)
6543 {
6544         union sctp_addr autoaddr;
6545         struct sctp_af *af;
6546         __be16 port;
6547 
6548         /* Initialize a local sockaddr structure to INADDR_ANY. */
6549         af = sctp_sk(sk)->pf->af;
6550 
6551         port = htons(inet_sk(sk)->inet_num);
6552         af->inaddr_any(&autoaddr, port);
6553 
6554         return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
6555 }
6556 
6557 /* Parse out IPPROTO_SCTP CMSG headers.  Perform only minimal validation.
6558  *
6559  * From RFC 2292
6560  * 4.2 The cmsghdr Structure *
6561  *
6562  * When ancillary data is sent or received, any number of ancillary data
6563  * objects can be specified by the msg_control and msg_controllen members of
6564  * the msghdr structure, because each object is preceded by
6565  * a cmsghdr structure defining the object's length (the cmsg_len member).
6566  * Historically Berkeley-derived implementations have passed only one object
6567  * at a time, but this API allows multiple objects to be
6568  * passed in a single call to sendmsg() or recvmsg(). The following example
6569  * shows two ancillary data objects in a control buffer.
6570  *
6571  *   |<--------------------------- msg_controllen -------------------------->|
6572  *   |                                                                       |
6573  *
6574  *   |<----- ancillary data object ----->|<----- ancillary data object ----->|
6575  *
6576  *   |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
6577  *   |                                   |                                   |
6578  *
6579  *   |<---------- cmsg_len ---------->|  |<--------- cmsg_len ----------->|  |
6580  *
6581  *   |<--------- CMSG_LEN() --------->|  |<-------- CMSG_LEN() ---------->|  |
6582  *   |                                |  |                                |  |
6583  *
6584  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6585  *   |cmsg_|cmsg_|cmsg_|XX|           |XX|cmsg_|cmsg_|cmsg_|XX|           |XX|
6586  *
6587  *   |len  |level|type |XX|cmsg_data[]|XX|len  |level|type |XX|cmsg_data[]|XX|
6588  *
6589  *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
6590  *    ^
6591  *    |
6592  *
6593  * msg_control
6594  * points here
6595  */
6596 static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
6597 {
6598         struct cmsghdr *cmsg;
6599         struct msghdr *my_msg = (struct msghdr *)msg;
6600 
6601         for_each_cmsghdr(cmsg, my_msg) {
6602                 if (!CMSG_OK(my_msg, cmsg))
6603                         return -EINVAL;
6604 
6605                 /* Should we