~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         *((struct sctp_chunk **)(chunk->skb->cb)) = 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;
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                 pr_debug("%s: we associated primitively\n", __func__);
1947         }
1948 
1949         /* Break the message into multiple chunks of maximum size. */
1950         datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1951         if (IS_ERR(datamsg)) {
1952                 err = PTR_ERR(datamsg);
1953                 goto out_free;
1954         }
1955 
1956         /* Now send the (possibly) fragmented message. */
1957         list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1958                 sctp_chunk_hold(chunk);
1959 
1960                 /* Do accounting for the write space.  */
1961                 sctp_set_owner_w(chunk);
1962 
1963                 chunk->transport = chunk_tp;
1964         }
1965 
1966         /* Send it to the lower layers.  Note:  all chunks
1967          * must either fail or succeed.   The lower layer
1968          * works that way today.  Keep it that way or this
1969          * breaks.
1970          */
1971         err = sctp_primitive_SEND(net, asoc, datamsg);
1972         /* Did the lower layer accept the chunk? */
1973         if (err) {
1974                 sctp_datamsg_free(datamsg);
1975                 goto out_free;
1976         }
1977 
1978         pr_debug("%s: we sent primitively\n", __func__);
1979 
1980         sctp_datamsg_put(datamsg);
1981         err = msg_len;
1982 
1983         /* If we are already past ASSOCIATE, the lower
1984          * layers are responsible for association cleanup.
1985          */
1986         goto out_unlock;
1987 
1988 out_free:
1989         if (new_asoc) {
1990                 sctp_unhash_established(asoc);
1991                 sctp_association_free(asoc);
1992         }
1993 out_unlock:
1994         release_sock(sk);
1995 
1996 out_nounlock:
1997         return sctp_error(sk, msg_flags, err);
1998 
1999 #if 0
2000 do_sock_err:
2001         if (msg_len)
2002                 err = msg_len;
2003         else
2004                 err = sock_error(sk);
2005         goto out;
2006 
2007 do_interrupted:
2008         if (msg_len)
2009                 err = msg_len;
2010         goto out;
2011 #endif /* 0 */
2012 }
2013 
2014 /* This is an extended version of skb_pull() that removes the data from the
2015  * start of a skb even when data is spread across the list of skb's in the
2016  * frag_list. len specifies the total amount of data that needs to be removed.
2017  * when 'len' bytes could be removed from the skb, it returns 0.
2018  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2019  * could not be removed.
2020  */
2021 static int sctp_skb_pull(struct sk_buff *skb, int len)
2022 {
2023         struct sk_buff *list;
2024         int skb_len = skb_headlen(skb);
2025         int rlen;
2026 
2027         if (len <= skb_len) {
2028                 __skb_pull(skb, len);
2029                 return 0;
2030         }
2031         len -= skb_len;
2032         __skb_pull(skb, skb_len);
2033 
2034         skb_walk_frags(skb, list) {
2035                 rlen = sctp_skb_pull(list, len);
2036                 skb->len -= (len-rlen);
2037                 skb->data_len -= (len-rlen);
2038 
2039                 if (!rlen)
2040                         return 0;
2041 
2042                 len = rlen;
2043         }
2044 
2045         return len;
2046 }
2047 
2048 /* API 3.1.3  recvmsg() - UDP Style Syntax
2049  *
2050  *  ssize_t recvmsg(int socket, struct msghdr *message,
2051  *                    int flags);
2052  *
2053  *  socket  - the socket descriptor of the endpoint.
2054  *  message - pointer to the msghdr structure which contains a single
2055  *            user message and possibly some ancillary data.
2056  *
2057  *            See Section 5 for complete description of the data
2058  *            structures.
2059  *
2060  *  flags   - flags sent or received with the user message, see Section
2061  *            5 for complete description of the flags.
2062  */
2063 static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2064                         struct msghdr *msg, size_t len, int noblock,
2065                         int flags, int *addr_len)
2066 {
2067         struct sctp_ulpevent *event = NULL;
2068         struct sctp_sock *sp = sctp_sk(sk);
2069         struct sk_buff *skb;
2070         int copied;
2071         int err = 0;
2072         int skb_len;
2073 
2074         pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2075                  "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2076                  addr_len);
2077 
2078         lock_sock(sk);
2079 
2080         if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2081                 err = -ENOTCONN;
2082                 goto out;
2083         }
2084 
2085         skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2086         if (!skb)
2087                 goto out;
2088 
2089         /* Get the total length of the skb including any skb's in the
2090          * frag_list.
2091          */
2092         skb_len = skb->len;
2093 
2094         copied = skb_len;
2095         if (copied > len)
2096                 copied = len;
2097 
2098         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2099 
2100         event = sctp_skb2event(skb);
2101 
2102         if (err)
2103                 goto out_free;
2104 
2105         sock_recv_ts_and_drops(msg, sk, skb);
2106         if (sctp_ulpevent_is_notification(event)) {
2107                 msg->msg_flags |= MSG_NOTIFICATION;
2108                 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2109         } else {
2110                 sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2111         }
2112 
2113         /* Check if we allow SCTP_NXTINFO. */
2114         if (sp->recvnxtinfo)
2115                 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2116         /* Check if we allow SCTP_RCVINFO. */
2117         if (sp->recvrcvinfo)
2118                 sctp_ulpevent_read_rcvinfo(event, msg);
2119         /* Check if we allow SCTP_SNDRCVINFO. */
2120         if (sp->subscribe.sctp_data_io_event)
2121                 sctp_ulpevent_read_sndrcvinfo(event, msg);
2122 
2123 #if 0
2124         /* FIXME: we should be calling IP/IPv6 layers.  */
2125         if (sk->sk_protinfo.af_inet.cmsg_flags)
2126                 ip_cmsg_recv(msg, skb);
2127 #endif
2128 
2129         err = copied;
2130 
2131         /* If skb's length exceeds the user's buffer, update the skb and
2132          * push it back to the receive_queue so that the next call to
2133          * recvmsg() will return the remaining data. Don't set MSG_EOR.
2134          */
2135         if (skb_len > copied) {
2136                 msg->msg_flags &= ~MSG_EOR;
2137                 if (flags & MSG_PEEK)
2138                         goto out_free;
2139                 sctp_skb_pull(skb, copied);
2140                 skb_queue_head(&sk->sk_receive_queue, skb);
2141 
2142                 /* When only partial message is copied to the user, increase
2143                  * rwnd by that amount. If all the data in the skb is read,
2144                  * rwnd is updated when the event is freed.
2145                  */
2146                 if (!sctp_ulpevent_is_notification(event))
2147                         sctp_assoc_rwnd_increase(event->asoc, copied);
2148                 goto out;
2149         } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2150                    (event->msg_flags & MSG_EOR))
2151                 msg->msg_flags |= MSG_EOR;
2152         else
2153                 msg->msg_flags &= ~MSG_EOR;
2154 
2155 out_free:
2156         if (flags & MSG_PEEK) {
2157                 /* Release the skb reference acquired after peeking the skb in
2158                  * sctp_skb_recv_datagram().
2159                  */
2160                 kfree_skb(skb);
2161         } else {
2162                 /* Free the event which includes releasing the reference to
2163                  * the owner of the skb, freeing the skb and updating the
2164                  * rwnd.
2165                  */
2166                 sctp_ulpevent_free(event);
2167         }
2168 out:
2169         release_sock(sk);
2170         return err;
2171 }
2172 
2173 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2174  *
2175  * This option is a on/off flag.  If enabled no SCTP message
2176  * fragmentation will be performed.  Instead if a message being sent
2177  * exceeds the current PMTU size, the message will NOT be sent and
2178  * instead a error will be indicated to the user.
2179  */
2180 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2181                                              char __user *optval,
2182                                              unsigned int optlen)
2183 {
2184         int val;
2185 
2186         if (optlen < sizeof(int))
2187                 return -EINVAL;
2188 
2189         if (get_user(val, (int __user *)optval))
2190                 return -EFAULT;
2191 
2192         sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2193 
2194         return 0;
2195 }
2196 
2197 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2198                                   unsigned int optlen)
2199 {
2200         struct sctp_association *asoc;
2201         struct sctp_ulpevent *event;
2202 
2203         if (optlen > sizeof(struct sctp_event_subscribe))
2204                 return -EINVAL;
2205         if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2206                 return -EFAULT;
2207 
2208         if (sctp_sk(sk)->subscribe.sctp_data_io_event)
2209                 pr_warn_ratelimited(DEPRECATED "%s (pid %d) "
2210                                     "Requested SCTP_SNDRCVINFO event.\n"
2211                                     "Use SCTP_RCVINFO through SCTP_RECVRCVINFO option instead.\n",
2212                                     current->comm, task_pid_nr(current));
2213 
2214         /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2215          * if there is no data to be sent or retransmit, the stack will
2216          * immediately send up this notification.
2217          */
2218         if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2219                                        &sctp_sk(sk)->subscribe)) {
2220                 asoc = sctp_id2assoc(sk, 0);
2221 
2222                 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2223                         event = sctp_ulpevent_make_sender_dry_event(asoc,
2224                                         GFP_ATOMIC);
2225                         if (!event)
2226                                 return -ENOMEM;
2227 
2228                         sctp_ulpq_tail_event(&asoc->ulpq, event);
2229                 }
2230         }
2231 
2232         return 0;
2233 }
2234 
2235 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2236  *
2237  * This socket option is applicable to the UDP-style socket only.  When
2238  * set it will cause associations that are idle for more than the
2239  * specified number of seconds to automatically close.  An association
2240  * being idle is defined an association that has NOT sent or received
2241  * user data.  The special value of '' indicates that no automatic
2242  * close of any associations should be performed.  The option expects an
2243  * integer defining the number of seconds of idle time before an
2244  * association is closed.
2245  */
2246 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2247                                      unsigned int optlen)
2248 {
2249         struct sctp_sock *sp = sctp_sk(sk);
2250         struct net *net = sock_net(sk);
2251 
2252         /* Applicable to UDP-style socket only */
2253         if (sctp_style(sk, TCP))
2254                 return -EOPNOTSUPP;
2255         if (optlen != sizeof(int))
2256                 return -EINVAL;
2257         if (copy_from_user(&sp->autoclose, optval, optlen))
2258                 return -EFAULT;
2259 
2260         if (sp->autoclose > net->sctp.max_autoclose)
2261                 sp->autoclose = net->sctp.max_autoclose;
2262 
2263         return 0;
2264 }
2265 
2266 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2267  *
2268  * Applications can enable or disable heartbeats for any peer address of
2269  * an association, modify an address's heartbeat interval, force a
2270  * heartbeat to be sent immediately, and adjust the address's maximum
2271  * number of retransmissions sent before an address is considered
2272  * unreachable.  The following structure is used to access and modify an
2273  * address's parameters:
2274  *
2275  *  struct sctp_paddrparams {
2276  *     sctp_assoc_t            spp_assoc_id;
2277  *     struct sockaddr_storage spp_address;
2278  *     uint32_t                spp_hbinterval;
2279  *     uint16_t                spp_pathmaxrxt;
2280  *     uint32_t                spp_pathmtu;
2281  *     uint32_t                spp_sackdelay;
2282  *     uint32_t                spp_flags;
2283  * };
2284  *
2285  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2286  *                     application, and identifies the association for
2287  *                     this query.
2288  *   spp_address     - This specifies which address is of interest.
2289  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2290  *                     in milliseconds.  If a  value of zero
2291  *                     is present in this field then no changes are to
2292  *                     be made to this parameter.
2293  *   spp_pathmaxrxt  - This contains the maximum number of
2294  *                     retransmissions before this address shall be
2295  *                     considered unreachable. If a  value of zero
2296  *                     is present in this field then no changes are to
2297  *                     be made to this parameter.
2298  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2299  *                     specified here will be the "fixed" path mtu.
2300  *                     Note that if the spp_address field is empty
2301  *                     then all associations on this address will
2302  *                     have this fixed path mtu set upon them.
2303  *
2304  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2305  *                     the number of milliseconds that sacks will be delayed
2306  *                     for. This value will apply to all addresses of an
2307  *                     association if the spp_address field is empty. Note
2308  *                     also, that if delayed sack is enabled and this
2309  *                     value is set to 0, no change is made to the last
2310  *                     recorded delayed sack timer value.
2311  *
2312  *   spp_flags       - These flags are used to control various features
2313  *                     on an association. The flag field may contain
2314  *                     zero or more of the following options.
2315  *
2316  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2317  *                     specified address. Note that if the address
2318  *                     field is empty all addresses for the association
2319  *                     have heartbeats enabled upon them.
2320  *
2321  *                     SPP_HB_DISABLE - Disable heartbeats on the
2322  *                     speicifed address. Note that if the address
2323  *                     field is empty all addresses for the association
2324  *                     will have their heartbeats disabled. Note also
2325  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2326  *                     mutually exclusive, only one of these two should
2327  *                     be specified. Enabling both fields will have
2328  *                     undetermined results.
2329  *
2330  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2331  *                     to be made immediately.
2332  *
2333  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2334  *                     heartbeat delayis to be set to the value of 0
2335  *                     milliseconds.
2336  *
2337  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2338  *                     discovery upon the specified address. Note that
2339  *                     if the address feild is empty then all addresses
2340  *                     on the association are effected.
2341  *
2342  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2343  *                     discovery upon the specified address. Note that
2344  *                     if the address feild is empty then all addresses
2345  *                     on the association are effected. Not also that
2346  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2347  *                     exclusive. Enabling both will have undetermined
2348  *                     results.
2349  *
2350  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2351  *                     on delayed sack. The time specified in spp_sackdelay
2352  *                     is used to specify the sack delay for this address. Note
2353  *                     that if spp_address is empty then all addresses will
2354  *                     enable delayed sack and take on the sack delay
2355  *                     value specified in spp_sackdelay.
2356  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2357  *                     off delayed sack. If the spp_address field is blank then
2358  *                     delayed sack is disabled for the entire association. Note
2359  *                     also that this field is mutually exclusive to
2360  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2361  *                     results.
2362  */
2363 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2364                                        struct sctp_transport   *trans,
2365                                        struct sctp_association *asoc,
2366                                        struct sctp_sock        *sp,
2367                                        int                      hb_change,
2368                                        int                      pmtud_change,
2369                                        int                      sackdelay_change)
2370 {
2371         int error;
2372 
2373         if (params->spp_flags & SPP_HB_DEMAND && trans) {
2374                 struct net *net = sock_net(trans->asoc->base.sk);
2375 
2376                 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2377                 if (error)
2378                         return error;
2379         }
2380 
2381         /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2382          * this field is ignored.  Note also that a value of zero indicates
2383          * the current setting should be left unchanged.
2384          */
2385         if (params->spp_flags & SPP_HB_ENABLE) {
2386 
2387                 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2388                  * set.  This lets us use 0 value when this flag
2389                  * is set.
2390                  */
2391                 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2392                         params->spp_hbinterval = 0;
2393 
2394                 if (params->spp_hbinterval ||
2395                     (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2396                         if (trans) {
2397                                 trans->hbinterval =
2398                                     msecs_to_jiffies(params->spp_hbinterval);
2399                         } else if (asoc) {
2400                                 asoc->hbinterval =
2401                                     msecs_to_jiffies(params->spp_hbinterval);
2402                         } else {
2403                                 sp->hbinterval = params->spp_hbinterval;
2404                         }
2405                 }
2406         }
2407 
2408         if (hb_change) {
2409                 if (trans) {
2410                         trans->param_flags =
2411                                 (trans->param_flags & ~SPP_HB) | hb_change;
2412                 } else if (asoc) {
2413                         asoc->param_flags =
2414                                 (asoc->param_flags & ~SPP_HB) | hb_change;
2415                 } else {
2416                         sp->param_flags =
2417                                 (sp->param_flags & ~SPP_HB) | hb_change;
2418                 }
2419         }
2420 
2421         /* When Path MTU discovery is disabled the value specified here will
2422          * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2423          * include the flag SPP_PMTUD_DISABLE for this field to have any
2424          * effect).
2425          */
2426         if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2427                 if (trans) {
2428                         trans->pathmtu = params->spp_pathmtu;
2429                         sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2430                 } else if (asoc) {
2431                         asoc->pathmtu = params->spp_pathmtu;
2432                         sctp_frag_point(asoc, params->spp_pathmtu);
2433                 } else {
2434                         sp->pathmtu = params->spp_pathmtu;
2435                 }
2436         }
2437 
2438         if (pmtud_change) {
2439                 if (trans) {
2440                         int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2441                                 (params->spp_flags & SPP_PMTUD_ENABLE);
2442                         trans->param_flags =
2443                                 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2444                         if (update) {
2445                                 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2446                                 sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2447                         }
2448                 } else if (asoc) {
2449                         asoc->param_flags =
2450                                 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2451                 } else {
2452                         sp->param_flags =
2453                                 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2454                 }
2455         }
2456 
2457         /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2458          * value of this field is ignored.  Note also that a value of zero
2459          * indicates the current setting should be left unchanged.
2460          */
2461         if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2462                 if (trans) {
2463                         trans->sackdelay =
2464                                 msecs_to_jiffies(params->spp_sackdelay);
2465                 } else if (asoc) {
2466                         asoc->sackdelay =
2467                                 msecs_to_jiffies(params->spp_sackdelay);
2468                 } else {
2469                         sp->sackdelay = params->spp_sackdelay;
2470                 }
2471         }
2472 
2473         if (sackdelay_change) {
2474                 if (trans) {
2475                         trans->param_flags =
2476                                 (trans->param_flags & ~SPP_SACKDELAY) |
2477                                 sackdelay_change;
2478                 } else if (asoc) {
2479                         asoc->param_flags =
2480                                 (asoc->param_flags & ~SPP_SACKDELAY) |
2481                                 sackdelay_change;
2482                 } else {
2483                         sp->param_flags =
2484                                 (sp->param_flags & ~SPP_SACKDELAY) |
2485                                 sackdelay_change;
2486                 }
2487         }
2488 
2489         /* Note that a value of zero indicates the current setting should be
2490            left unchanged.
2491          */
2492         if (params->spp_pathmaxrxt) {
2493                 if (trans) {
2494                         trans->pathmaxrxt = params->spp_pathmaxrxt;
2495                 } else if (asoc) {
2496                         asoc->pathmaxrxt = params->spp_pathmaxrxt;
2497                 } else {
2498                         sp->pathmaxrxt = params->spp_pathmaxrxt;
2499                 }
2500         }
2501 
2502         return 0;
2503 }
2504 
2505 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2506                                             char __user *optval,
2507                                             unsigned int optlen)
2508 {
2509         struct sctp_paddrparams  params;
2510         struct sctp_transport   *trans = NULL;
2511         struct sctp_association *asoc = NULL;
2512         struct sctp_sock        *sp = sctp_sk(sk);
2513         int error;
2514         int hb_change, pmtud_change, sackdelay_change;
2515 
2516         if (optlen != sizeof(struct sctp_paddrparams))
2517                 return -EINVAL;
2518 
2519         if (copy_from_user(&params, optval, optlen))
2520                 return -EFAULT;
2521 
2522         /* Validate flags and value parameters. */
2523         hb_change        = params.spp_flags & SPP_HB;
2524         pmtud_change     = params.spp_flags & SPP_PMTUD;
2525         sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2526 
2527         if (hb_change        == SPP_HB ||
2528             pmtud_change     == SPP_PMTUD ||
2529             sackdelay_change == SPP_SACKDELAY ||
2530             params.spp_sackdelay > 500 ||
2531             (params.spp_pathmtu &&
2532              params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2533                 return -EINVAL;
2534 
2535         /* If an address other than INADDR_ANY is specified, and
2536          * no transport is found, then the request is invalid.
2537          */
2538         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2539                 trans = sctp_addr_id2transport(sk, &params.spp_address,
2540                                                params.spp_assoc_id);
2541                 if (!trans)
2542                         return -EINVAL;
2543         }
2544 
2545         /* Get association, if assoc_id != 0 and the socket is a one
2546          * to many style socket, and an association was not found, then
2547          * the id was invalid.
2548          */
2549         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2550         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2551                 return -EINVAL;
2552 
2553         /* Heartbeat demand can only be sent on a transport or
2554          * association, but not a socket.
2555          */
2556         if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2557                 return -EINVAL;
2558 
2559         /* Process parameters. */
2560         error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2561                                             hb_change, pmtud_change,
2562                                             sackdelay_change);
2563 
2564         if (error)
2565                 return error;
2566 
2567         /* If changes are for association, also apply parameters to each
2568          * transport.
2569          */
2570         if (!trans && asoc) {
2571                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2572                                 transports) {
2573                         sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2574                                                     hb_change, pmtud_change,
2575                                                     sackdelay_change);
2576                 }
2577         }
2578 
2579         return 0;
2580 }
2581 
2582 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2583 {
2584         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2585 }
2586 
2587 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2588 {
2589         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2590 }
2591 
2592 /*
2593  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2594  *
2595  * This option will effect the way delayed acks are performed.  This
2596  * option allows you to get or set the delayed ack time, in
2597  * milliseconds.  It also allows changing the delayed ack frequency.
2598  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2599  * the assoc_id is 0, then this sets or gets the endpoints default
2600  * values.  If the assoc_id field is non-zero, then the set or get
2601  * effects the specified association for the one to many model (the
2602  * assoc_id field is ignored by the one to one model).  Note that if
2603  * sack_delay or sack_freq are 0 when setting this option, then the
2604  * current values will remain unchanged.
2605  *
2606  * struct sctp_sack_info {
2607  *     sctp_assoc_t            sack_assoc_id;
2608  *     uint32_t                sack_delay;
2609  *     uint32_t                sack_freq;
2610  * };
2611  *
2612  * sack_assoc_id -  This parameter, indicates which association the user
2613  *    is performing an action upon.  Note that if this field's value is
2614  *    zero then the endpoints default value is changed (effecting future
2615  *    associations only).
2616  *
2617  * sack_delay -  This parameter contains the number of milliseconds that
2618  *    the user is requesting the delayed ACK timer be set to.  Note that
2619  *    this value is defined in the standard to be between 200 and 500
2620  *    milliseconds.
2621  *
2622  * sack_freq -  This parameter contains the number of packets that must
2623  *    be received before a sack is sent without waiting for the delay
2624  *    timer to expire.  The default value for this is 2, setting this
2625  *    value to 1 will disable the delayed sack algorithm.
2626  */
2627 
2628 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2629                                        char __user *optval, unsigned int optlen)
2630 {
2631         struct sctp_sack_info    params;
2632         struct sctp_transport   *trans = NULL;
2633         struct sctp_association *asoc = NULL;
2634         struct sctp_sock        *sp = sctp_sk(sk);
2635 
2636         if (optlen == sizeof(struct sctp_sack_info)) {
2637                 if (copy_from_user(&params, optval, optlen))
2638                         return -EFAULT;
2639 
2640                 if (params.sack_delay == 0 && params.sack_freq == 0)
2641                         return 0;
2642         } else if (optlen == sizeof(struct sctp_assoc_value)) {
2643                 pr_warn_ratelimited(DEPRECATED
2644                                     "%s (pid %d) "
2645                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2646                                     "Use struct sctp_sack_info instead\n",
2647                                     current->comm, task_pid_nr(current));
2648                 if (copy_from_user(&params, optval, optlen))
2649                         return -EFAULT;
2650 
2651                 if (params.sack_delay == 0)
2652                         params.sack_freq = 1;
2653                 else
2654                         params.sack_freq = 0;
2655         } else
2656                 return -EINVAL;
2657 
2658         /* Validate value parameter. */
2659         if (params.sack_delay > 500)
2660                 return -EINVAL;
2661 
2662         /* Get association, if sack_assoc_id != 0 and the socket is a one
2663          * to many style socket, and an association was not found, then
2664          * the id was invalid.
2665          */
2666         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2667         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2668                 return -EINVAL;
2669 
2670         if (params.sack_delay) {
2671                 if (asoc) {
2672                         asoc->sackdelay =
2673                                 msecs_to_jiffies(params.sack_delay);
2674                         asoc->param_flags =
2675                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2676                 } else {
2677                         sp->sackdelay = params.sack_delay;
2678                         sp->param_flags =
2679                                 sctp_spp_sackdelay_enable(sp->param_flags);
2680                 }
2681         }
2682 
2683         if (params.sack_freq == 1) {
2684                 if (asoc) {
2685                         asoc->param_flags =
2686                                 sctp_spp_sackdelay_disable(asoc->param_flags);
2687                 } else {
2688                         sp->param_flags =
2689                                 sctp_spp_sackdelay_disable(sp->param_flags);
2690                 }
2691         } else if (params.sack_freq > 1) {
2692                 if (asoc) {
2693                         asoc->sackfreq = params.sack_freq;
2694                         asoc->param_flags =
2695                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2696                 } else {
2697                         sp->sackfreq = params.sack_freq;
2698                         sp->param_flags =
2699                                 sctp_spp_sackdelay_enable(sp->param_flags);
2700                 }
2701         }
2702 
2703         /* If change is for association, also apply to each transport. */
2704         if (asoc) {
2705                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2706                                 transports) {
2707                         if (params.sack_delay) {
2708                                 trans->sackdelay =
2709                                         msecs_to_jiffies(params.sack_delay);
2710                                 trans->param_flags =
2711                                         sctp_spp_sackdelay_enable(trans->param_flags);
2712                         }
2713                         if (params.sack_freq == 1) {
2714                                 trans->param_flags =
2715                                         sctp_spp_sackdelay_disable(trans->param_flags);
2716                         } else if (params.sack_freq > 1) {
2717                                 trans->sackfreq = params.sack_freq;
2718                                 trans->param_flags =
2719                                         sctp_spp_sackdelay_enable(trans->param_flags);
2720                         }
2721                 }
2722         }
2723 
2724         return 0;
2725 }
2726 
2727 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2728  *
2729  * Applications can specify protocol parameters for the default association
2730  * initialization.  The option name argument to setsockopt() and getsockopt()
2731  * is SCTP_INITMSG.
2732  *
2733  * Setting initialization parameters is effective only on an unconnected
2734  * socket (for UDP-style sockets only future associations are effected
2735  * by the change).  With TCP-style sockets, this option is inherited by
2736  * sockets derived from a listener socket.
2737  */
2738 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2739 {
2740         struct sctp_initmsg sinit;
2741         struct sctp_sock *sp = sctp_sk(sk);
2742 
2743         if (optlen != sizeof(struct sctp_initmsg))
2744                 return -EINVAL;
2745         if (copy_from_user(&sinit, optval, optlen))
2746                 return -EFAULT;
2747 
2748         if (sinit.sinit_num_ostreams)
2749                 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2750         if (sinit.sinit_max_instreams)
2751                 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2752         if (sinit.sinit_max_attempts)
2753                 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2754         if (sinit.sinit_max_init_timeo)
2755                 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2756 
2757         return 0;
2758 }
2759 
2760 /*
2761  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2762  *
2763  *   Applications that wish to use the sendto() system call may wish to
2764  *   specify a default set of parameters that would normally be supplied
2765  *   through the inclusion of ancillary data.  This socket option allows
2766  *   such an application to set the default sctp_sndrcvinfo structure.
2767  *   The application that wishes to use this socket option simply passes
2768  *   in to this call the sctp_sndrcvinfo structure defined in Section
2769  *   5.2.2) The input parameters accepted by this call include
2770  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2771  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2772  *   to this call if the caller is using the UDP model.
2773  */
2774 static int sctp_setsockopt_default_send_param(struct sock *sk,
2775                                               char __user *optval,
2776                                               unsigned int optlen)
2777 {
2778         struct sctp_sock *sp = sctp_sk(sk);
2779         struct sctp_association *asoc;
2780         struct sctp_sndrcvinfo info;
2781 
2782         if (optlen != sizeof(info))
2783                 return -EINVAL;
2784         if (copy_from_user(&info, optval, optlen))
2785                 return -EFAULT;
2786         if (info.sinfo_flags &
2787             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2788               SCTP_ABORT | SCTP_EOF))
2789                 return -EINVAL;
2790 
2791         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2792         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2793                 return -EINVAL;
2794         if (asoc) {
2795                 asoc->default_stream = info.sinfo_stream;
2796                 asoc->default_flags = info.sinfo_flags;
2797                 asoc->default_ppid = info.sinfo_ppid;
2798                 asoc->default_context = info.sinfo_context;
2799                 asoc->default_timetolive = info.sinfo_timetolive;
2800         } else {
2801                 sp->default_stream = info.sinfo_stream;
2802                 sp->default_flags = info.sinfo_flags;
2803                 sp->default_ppid = info.sinfo_ppid;
2804                 sp->default_context = info.sinfo_context;
2805                 sp->default_timetolive = info.sinfo_timetolive;
2806         }
2807 
2808         return 0;
2809 }
2810 
2811 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2812  * (SCTP_DEFAULT_SNDINFO)
2813  */
2814 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2815                                            char __user *optval,
2816                                            unsigned int optlen)
2817 {
2818         struct sctp_sock *sp = sctp_sk(sk);
2819         struct sctp_association *asoc;
2820         struct sctp_sndinfo info;
2821 
2822         if (optlen != sizeof(info))
2823                 return -EINVAL;
2824         if (copy_from_user(&info, optval, optlen))
2825                 return -EFAULT;
2826         if (info.snd_flags &
2827             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2828               SCTP_ABORT | SCTP_EOF))
2829                 return -EINVAL;
2830 
2831         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
2832         if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
2833                 return -EINVAL;
2834         if (asoc) {
2835                 asoc->default_stream = info.snd_sid;
2836                 asoc->default_flags = info.snd_flags;
2837                 asoc->default_ppid = info.snd_ppid;
2838                 asoc->default_context = info.snd_context;
2839         } else {
2840                 sp->default_stream = info.snd_sid;
2841                 sp->default_flags = info.snd_flags;
2842                 sp->default_ppid = info.snd_ppid;
2843                 sp->default_context = info.snd_context;
2844         }
2845 
2846         return 0;
2847 }
2848 
2849 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2850  *
2851  * Requests that the local SCTP stack use the enclosed peer address as
2852  * the association primary.  The enclosed address must be one of the
2853  * association peer's addresses.
2854  */
2855 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2856                                         unsigned int optlen)
2857 {
2858         struct sctp_prim prim;
2859         struct sctp_transport *trans;
2860 
2861         if (optlen != sizeof(struct sctp_prim))
2862                 return -EINVAL;
2863 
2864         if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2865                 return -EFAULT;
2866 
2867         trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2868         if (!trans)
2869                 return -EINVAL;
2870 
2871         sctp_assoc_set_primary(trans->asoc, trans);
2872 
2873         return 0;
2874 }
2875 
2876 /*
2877  * 7.1.5 SCTP_NODELAY
2878  *
2879  * Turn on/off any Nagle-like algorithm.  This means that packets are
2880  * generally sent as soon as possible and no unnecessary delays are
2881  * introduced, at the cost of more packets in the network.  Expects an
2882  *  integer boolean flag.
2883  */
2884 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2885                                    unsigned int optlen)
2886 {
2887         int val;
2888 
2889         if (optlen < sizeof(int))
2890                 return -EINVAL;
2891         if (get_user(val, (int __user *)optval))
2892                 return -EFAULT;
2893 
2894         sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2895         return 0;
2896 }
2897 
2898 /*
2899  *
2900  * 7.1.1 SCTP_RTOINFO
2901  *
2902  * The protocol parameters used to initialize and bound retransmission
2903  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2904  * and modify these parameters.
2905  * All parameters are time values, in milliseconds.  A value of 0, when
2906  * modifying the parameters, indicates that the current value should not
2907  * be changed.
2908  *
2909  */
2910 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2911 {
2912         struct sctp_rtoinfo rtoinfo;
2913         struct sctp_association *asoc;
2914         unsigned long rto_min, rto_max;
2915         struct sctp_sock *sp = sctp_sk(sk);
2916 
2917         if (optlen != sizeof (struct sctp_rtoinfo))
2918                 return -EINVAL;
2919 
2920         if (copy_from_user(&rtoinfo, optval, optlen))
2921                 return -EFAULT;
2922 
2923         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2924 
2925         /* Set the values to the specific association */
2926         if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2927                 return -EINVAL;
2928 
2929         rto_max = rtoinfo.srto_max;
2930         rto_min = rtoinfo.srto_min;
2931 
2932         if (rto_max)
2933                 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
2934         else
2935                 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
2936 
2937         if (rto_min)
2938                 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
2939         else
2940                 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
2941 
2942         if (rto_min > rto_max)
2943                 return -EINVAL;
2944 
2945         if (asoc) {
2946                 if (rtoinfo.srto_initial != 0)
2947                         asoc->rto_initial =
2948                                 msecs_to_jiffies(rtoinfo.srto_initial);
2949                 asoc->rto_max = rto_max;
2950                 asoc->rto_min = rto_min;
2951         } else {
2952                 /* If there is no association or the association-id = 0
2953                  * set the values to the endpoint.
2954                  */
2955                 if (rtoinfo.srto_initial != 0)
2956                         sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2957                 sp->rtoinfo.srto_max = rto_max;
2958                 sp->rtoinfo.srto_min = rto_min;
2959         }
2960 
2961         return 0;
2962 }
2963 
2964 /*
2965  *
2966  * 7.1.2 SCTP_ASSOCINFO
2967  *
2968  * This option is used to tune the maximum retransmission attempts
2969  * of the association.
2970  * Returns an error if the new association retransmission value is
2971  * greater than the sum of the retransmission value  of the peer.
2972  * See [SCTP] for more information.
2973  *
2974  */
2975 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2976 {
2977 
2978         struct sctp_assocparams assocparams;
2979         struct sctp_association *asoc;
2980 
2981         if (optlen != sizeof(struct sctp_assocparams))
2982                 return -EINVAL;
2983         if (copy_from_user(&assocparams, optval, optlen))
2984                 return -EFAULT;
2985 
2986         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2987 
2988         if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2989                 return -EINVAL;
2990 
2991         /* Set the values to the specific association */
2992         if (asoc) {
2993                 if (assocparams.sasoc_asocmaxrxt != 0) {
2994                         __u32 path_sum = 0;
2995                         int   paths = 0;
2996                         struct sctp_transport *peer_addr;
2997 
2998                         list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2999                                         transports) {
3000                                 path_sum += peer_addr->pathmaxrxt;
3001                                 paths++;
3002                         }
3003 
3004                         /* Only validate asocmaxrxt if we have more than
3005                          * one path/transport.  We do this because path
3006                          * retransmissions are only counted when we have more
3007                          * then one path.
3008                          */
3009                         if (paths > 1 &&
3010                             assocparams.sasoc_asocmaxrxt > path_sum)
3011                                 return -EINVAL;
3012 
3013                         asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3014                 }
3015 
3016                 if (assocparams.sasoc_cookie_life != 0)
3017                         asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3018         } else {
3019                 /* Set the values to the endpoint */
3020                 struct sctp_sock *sp = sctp_sk(sk);
3021 
3022                 if (assocparams.sasoc_asocmaxrxt != 0)
3023                         sp->assocparams.sasoc_asocmaxrxt =
3024                                                 assocparams.sasoc_asocmaxrxt;
3025                 if (assocparams.sasoc_cookie_life != 0)
3026                         sp->assocparams.sasoc_cookie_life =
3027                                                 assocparams.sasoc_cookie_life;
3028         }
3029         return 0;
3030 }
3031 
3032 /*
3033  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3034  *
3035  * This socket option is a boolean flag which turns on or off mapped V4
3036  * addresses.  If this option is turned on and the socket is type
3037  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3038  * If this option is turned off, then no mapping will be done of V4
3039  * addresses and a user will receive both PF_INET6 and PF_INET type
3040  * addresses on the socket.
3041  */
3042 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3043 {
3044         int val;
3045         struct sctp_sock *sp = sctp_sk(sk);
3046 
3047         if (optlen < sizeof(int))
3048                 return -EINVAL;
3049         if (get_user(val, (int __user *)optval))
3050                 return -EFAULT;
3051         if (val)
3052                 sp->v4mapped = 1;
3053         else
3054                 sp->v4mapped = 0;
3055 
3056         return 0;
3057 }
3058 
3059 /*
3060  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3061  * This option will get or set the maximum size to put in any outgoing
3062  * SCTP DATA chunk.  If a message is larger than this size it will be
3063  * fragmented by SCTP into the specified size.  Note that the underlying
3064  * SCTP implementation may fragment into smaller sized chunks when the
3065  * PMTU of the underlying association is smaller than the value set by
3066  * the user.  The default value for this option is '' which indicates
3067  * the user is NOT limiting fragmentation and only the PMTU will effect
3068  * SCTP's choice of DATA chunk size.  Note also that values set larger
3069  * than the maximum size of an IP datagram will effectively let SCTP
3070  * control fragmentation (i.e. the same as setting this option to 0).
3071  *
3072  * The following structure is used to access and modify this parameter:
3073  *
3074  * struct sctp_assoc_value {
3075  *   sctp_assoc_t assoc_id;
3076  *   uint32_t assoc_value;
3077  * };
3078  *
3079  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3080  *    For one-to-many style sockets this parameter indicates which
3081  *    association the user is performing an action upon.  Note that if
3082  *    this field's value is zero then the endpoints default value is
3083  *    changed (effecting future associations only).
3084  * assoc_value:  This parameter specifies the maximum size in bytes.
3085  */
3086 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3087 {
3088         struct sctp_assoc_value params;
3089         struct sctp_association *asoc;
3090         struct sctp_sock *sp = sctp_sk(sk);
3091         int val;
3092 
3093         if (optlen == sizeof(int)) {
3094                 pr_warn_ratelimited(DEPRECATED
3095                                     "%s (pid %d) "
3096                                     "Use of int in maxseg socket option.\n"
3097                                     "Use struct sctp_assoc_value instead\n",
3098                                     current->comm, task_pid_nr(current));
3099                 if (copy_from_user(&val, optval, optlen))
3100                         return -EFAULT;
3101                 params.assoc_id = 0;
3102         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3103                 if (copy_from_user(&params, optval, optlen))
3104                         return -EFAULT;
3105                 val = params.assoc_value;
3106         } else
3107                 return -EINVAL;
3108 
3109         if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3110                 return -EINVAL;
3111 
3112         asoc = sctp_id2assoc(sk, params.assoc_id);
3113         if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3114                 return -EINVAL;
3115 
3116         if (asoc) {
3117                 if (val == 0) {
3118                         val = asoc->pathmtu;
3119                         val -= sp->pf->af->net_header_len;
3120                         val -= sizeof(struct sctphdr) +
3121                                         sizeof(struct sctp_data_chunk);
3122                 }
3123                 asoc->user_frag = val;
3124                 asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3125         } else {
3126                 sp->user_frag = val;
3127         }
3128 
3129         return 0;
3130 }
3131 
3132 
3133 /*
3134  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3135  *
3136  *   Requests that the peer mark the enclosed address as the association
3137  *   primary. The enclosed address must be one of the association's
3138  *   locally bound addresses. The following structure is used to make a
3139  *   set primary request:
3140  */
3141 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3142                                              unsigned int optlen)
3143 {
3144         struct net *net = sock_net(sk);
3145         struct sctp_sock        *sp;
3146         struct sctp_association *asoc = NULL;
3147         struct sctp_setpeerprim prim;
3148         struct sctp_chunk       *chunk;
3149         struct sctp_af          *af;
3150         int                     err;
3151 
3152         sp = sctp_sk(sk);
3153 
3154         if (!net->sctp.addip_enable)
3155                 return -EPERM;
3156 
3157         if (optlen != sizeof(struct sctp_setpeerprim))
3158                 return -EINVAL;
3159 
3160         if (copy_from_user(&prim, optval, optlen))
3161                 return -EFAULT;
3162 
3163         asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3164         if (!asoc)
3165                 return -EINVAL;
3166 
3167         if (!asoc->peer.asconf_capable)
3168                 return -EPERM;
3169 
3170         if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3171                 return -EPERM;
3172 
3173         if (!sctp_state(asoc, ESTABLISHED))
3174                 return -ENOTCONN;
3175 
3176         af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3177         if (!af)
3178                 return -EINVAL;
3179 
3180         if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3181                 return -EADDRNOTAVAIL;
3182 
3183         if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3184                 return -EADDRNOTAVAIL;
3185 
3186         /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3187         chunk = sctp_make_asconf_set_prim(asoc,
3188                                           (union sctp_addr *)&prim.sspp_addr);
3189         if (!chunk)
3190                 return -ENOMEM;
3191 
3192         err = sctp_send_asconf(asoc, chunk);
3193 
3194         pr_debug("%s: we set peer primary addr primitively\n", __func__);
3195 
3196         return err;
3197 }
3198 
3199 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3200                                             unsigned int optlen)
3201 {
3202         struct sctp_setadaptation adaptation;
3203 
3204         if (optlen != sizeof(struct sctp_setadaptation))
3205                 return -EINVAL;
3206         if (copy_from_user(&adaptation, optval, optlen))
3207                 return -EFAULT;
3208 
3209         sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3210 
3211         return 0;
3212 }
3213 
3214 /*
3215  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3216  *
3217  * The context field in the sctp_sndrcvinfo structure is normally only
3218  * used when a failed message is retrieved holding the value that was
3219  * sent down on the actual send call.  This option allows the setting of
3220  * a default context on an association basis that will be received on
3221  * reading messages from the peer.  This is especially helpful in the
3222  * one-2-many model for an application to keep some reference to an
3223  * internal state machine that is processing messages on the
3224  * association.  Note that the setting of this value only effects
3225  * received messages from the peer and does not effect the value that is
3226  * saved with outbound messages.
3227  */
3228 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3229                                    unsigned int optlen)
3230 {
3231         struct sctp_assoc_value params;
3232         struct sctp_sock *sp;
3233         struct sctp_association *asoc;
3234 
3235         if (optlen != sizeof(struct sctp_assoc_value))
3236                 return -EINVAL;
3237         if (copy_from_user(&params, optval, optlen))
3238                 return -EFAULT;
3239 
3240         sp = sctp_sk(sk);
3241 
3242         if (params.assoc_id != 0) {
3243                 asoc = sctp_id2assoc(sk, params.assoc_id);
3244                 if (!asoc)
3245                         return -EINVAL;
3246                 asoc->default_rcv_context = params.assoc_value;
3247         } else {
3248                 sp->default_rcv_context = params.assoc_value;
3249         }
3250 
3251         return 0;
3252 }
3253 
3254 /*
3255  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3256  *
3257  * This options will at a minimum specify if the implementation is doing
3258  * fragmented interleave.  Fragmented interleave, for a one to many
3259  * socket, is when subsequent calls to receive a message may return
3260  * parts of messages from different associations.  Some implementations
3261  * may allow you to turn this value on or off.  If so, when turned off,
3262  * no fragment interleave will occur (which will cause a head of line
3263  * blocking amongst multiple associations sharing the same one to many
3264  * socket).  When this option is turned on, then each receive call may
3265  * come from a different association (thus the user must receive data
3266  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3267  * association each receive belongs to.
3268  *
3269  * This option takes a boolean value.  A non-zero value indicates that
3270  * fragmented interleave is on.  A value of zero indicates that
3271  * fragmented interleave is off.
3272  *
3273  * Note that it is important that an implementation that allows this
3274  * option to be turned on, have it off by default.  Otherwise an unaware
3275  * application using the one to many model may become confused and act
3276  * incorrectly.
3277  */
3278 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3279                                                char __user *optval,
3280                                                unsigned int optlen)
3281 {
3282         int val;
3283 
3284         if (optlen != sizeof(int))
3285                 return -EINVAL;
3286         if (get_user(val, (int __user *)optval))
3287                 return -EFAULT;
3288 
3289         sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3290 
3291         return 0;
3292 }
3293 
3294 /*
3295  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3296  *       (SCTP_PARTIAL_DELIVERY_POINT)
3297  *
3298  * This option will set or get the SCTP partial delivery point.  This
3299  * point is the size of a message where the partial delivery API will be
3300  * invoked to help free up rwnd space for the peer.  Setting this to a
3301  * lower value will cause partial deliveries to happen more often.  The
3302  * calls argument is an integer that sets or gets the partial delivery
3303  * point.  Note also that the call will fail if the user attempts to set
3304  * this value larger than the socket receive buffer size.
3305  *
3306  * Note that any single message having a length smaller than or equal to
3307  * the SCTP partial delivery point will be delivered in one single read
3308  * call as long as the user provided buffer is large enough to hold the
3309  * message.
3310  */
3311 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3312                                                   char __user *optval,
3313                                                   unsigned int optlen)
3314 {
3315         u32 val;
3316 
3317         if (optlen != sizeof(u32))
3318                 return -EINVAL;
3319         if (get_user(val, (int __user *)optval))
3320                 return -EFAULT;
3321 
3322         /* Note: We double the receive buffer from what the user sets
3323          * it to be, also initial rwnd is based on rcvbuf/2.
3324          */
3325         if (val > (sk->sk_rcvbuf >> 1))
3326                 return -EINVAL;
3327 
3328         sctp_sk(sk)->pd_point = val;
3329 
3330         return 0; /* is this the right error code? */
3331 }
3332 
3333 /*
3334  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3335  *
3336  * This option will allow a user to change the maximum burst of packets
3337  * that can be emitted by this association.  Note that the default value
3338  * is 4, and some implementations may restrict this setting so that it
3339  * can only be lowered.
3340  *
3341  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3342  * future associations inheriting the socket value.
3343  */
3344 static int sctp_setsockopt_maxburst(struct sock *sk,
3345                                     char __user *optval,
3346                                     unsigned int optlen)
3347 {
3348         struct sctp_assoc_value params;
3349         struct sctp_sock *sp;
3350         struct sctp_association *asoc;
3351         int val;
3352         int assoc_id = 0;
3353 
3354         if (optlen == sizeof(int)) {
3355                 pr_warn_ratelimited(DEPRECATED
3356                                     "%s (pid %d) "
3357                                     "Use of int in max_burst socket option deprecated.\n"
3358                                     "Use struct sctp_assoc_value instead\n",
3359                                     current->comm, task_pid_nr(current));
3360                 if (copy_from_user(&val, optval, optlen))
3361                         return -EFAULT;
3362         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3363                 if (copy_from_user(&params, optval, optlen))
3364                         return -EFAULT;
3365                 val = params.assoc_value;
3366                 assoc_id = params.assoc_id;
3367         } else
3368                 return -EINVAL;
3369 
3370         sp = sctp_sk(sk);
3371 
3372         if (assoc_id != 0) {
3373                 asoc = sctp_id2assoc(sk, assoc_id);
3374                 if (!asoc)
3375                         return -EINVAL;
3376                 asoc->max_burst = val;
3377         } else
3378                 sp->max_burst = val;
3379 
3380         return 0;
3381 }
3382 
3383 /*
3384  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3385  *
3386  * This set option adds a chunk type that the user is requesting to be
3387  * received only in an authenticated way.  Changes to the list of chunks
3388  * will only effect future associations on the socket.
3389  */
3390 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3391                                       char __user *optval,
3392                                       unsigned int optlen)
3393 {
3394         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3395         struct sctp_authchunk val;
3396 
3397         if (!ep->auth_enable)
3398                 return -EACCES;
3399 
3400         if (optlen != sizeof(struct sctp_authchunk))
3401                 return -EINVAL;
3402         if (copy_from_user(&val, optval, optlen))
3403                 return -EFAULT;
3404 
3405         switch (val.sauth_chunk) {
3406         case SCTP_CID_INIT:
3407         case SCTP_CID_INIT_ACK:
3408         case SCTP_CID_SHUTDOWN_COMPLETE:
3409         case SCTP_CID_AUTH:
3410                 return -EINVAL;
3411         }
3412 
3413         /* add this chunk id to the endpoint */
3414         return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3415 }
3416 
3417 /*
3418  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3419  *
3420  * This option gets or sets the list of HMAC algorithms that the local
3421  * endpoint requires the peer to use.
3422  */
3423 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3424                                       char __user *optval,
3425                                       unsigned int optlen)
3426 {
3427         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3428         struct sctp_hmacalgo *hmacs;
3429         u32 idents;
3430         int err;
3431 
3432         if (!ep->auth_enable)
3433                 return -EACCES;
3434 
3435         if (optlen < sizeof(struct sctp_hmacalgo))
3436                 return -EINVAL;
3437 
3438         hmacs = memdup_user(optval, optlen);
3439         if (IS_ERR(hmacs))
3440                 return PTR_ERR(hmacs);
3441 
3442         idents = hmacs->shmac_num_idents;
3443         if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3444             (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3445                 err = -EINVAL;
3446                 goto out;
3447         }
3448 
3449         err = sctp_auth_ep_set_hmacs(ep, hmacs);
3450 out:
3451         kfree(hmacs);
3452         return err;
3453 }
3454 
3455 /*
3456  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3457  *
3458  * This option will set a shared secret key which is used to build an
3459  * association shared key.
3460  */
3461 static int sctp_setsockopt_auth_key(struct sock *sk,
3462                                     char __user *optval,
3463                                     unsigned int optlen)
3464 {
3465         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3466         struct sctp_authkey *authkey;
3467         struct sctp_association *asoc;
3468         int ret;
3469 
3470         if (!ep->auth_enable)
3471                 return -EACCES;
3472 
3473         if (optlen <= sizeof(struct sctp_authkey))
3474                 return -EINVAL;
3475 
3476         authkey = memdup_user(optval, optlen);
3477         if (IS_ERR(authkey))
3478                 return PTR_ERR(authkey);
3479 
3480         if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3481                 ret = -EINVAL;
3482                 goto out;
3483         }
3484 
3485         asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3486         if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3487                 ret = -EINVAL;
3488                 goto out;
3489         }
3490 
3491         ret = sctp_auth_set_key(ep, asoc, authkey);
3492 out:
3493         kzfree(authkey);
3494         return ret;
3495 }
3496 
3497 /*
3498  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3499  *
3500  * This option will get or set the active shared key to be used to build
3501  * the association shared key.
3502  */
3503 static int sctp_setsockopt_active_key(struct sock *sk,
3504                                       char __user *optval,
3505                                       unsigned int optlen)
3506 {
3507         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3508         struct sctp_authkeyid val;
3509         struct sctp_association *asoc;
3510 
3511         if (!ep->auth_enable)
3512                 return -EACCES;
3513 
3514         if (optlen != sizeof(struct sctp_authkeyid))
3515                 return -EINVAL;
3516         if (copy_from_user(&val, optval, optlen))
3517                 return -EFAULT;
3518 
3519         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3520         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3521                 return -EINVAL;
3522 
3523         return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3524 }
3525 
3526 /*
3527  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3528  *
3529  * This set option will delete a shared secret key from use.
3530  */
3531 static int sctp_setsockopt_del_key(struct sock *sk,
3532                                    char __user *optval,
3533                                    unsigned int optlen)
3534 {
3535         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3536         struct sctp_authkeyid val;
3537         struct sctp_association *asoc;
3538 
3539         if (!ep->auth_enable)
3540                 return -EACCES;
3541 
3542         if (optlen != sizeof(struct sctp_authkeyid))
3543                 return -EINVAL;
3544         if (copy_from_user(&val, optval, optlen))
3545                 return -EFAULT;
3546 
3547         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3548         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3549                 return -EINVAL;
3550 
3551         return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3552 
3553 }
3554 
3555 /*
3556  * 8.1.23 SCTP_AUTO_ASCONF
3557  *
3558  * This option will enable or disable the use of the automatic generation of
3559  * ASCONF chunks to add and delete addresses to an existing association.  Note
3560  * that this option has two caveats namely: a) it only affects sockets that
3561  * are bound to all addresses available to the SCTP stack, and b) the system
3562  * administrator may have an overriding control that turns the ASCONF feature
3563  * off no matter what setting the socket option may have.
3564  * This option expects an integer boolean flag, where a non-zero value turns on
3565  * the option, and a zero value turns off the option.
3566  * Note. In this implementation, socket operation overrides default parameter
3567  * being set by sysctl as well as FreeBSD implementation
3568  */
3569 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3570                                         unsigned int optlen)
3571 {
3572         int val;
3573         struct sctp_sock *sp = sctp_sk(sk);
3574 
3575         if (optlen < sizeof(int))
3576                 return -EINVAL;
3577         if (get_user(val, (int __user *)optval))
3578                 return -EFAULT;
3579         if (!sctp_is_ep_boundall(sk) && val)
3580                 return -EINVAL;
3581         if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3582                 return 0;
3583 
3584         if (val == 0 && sp->do_auto_asconf) {
3585                 list_del(&sp->auto_asconf_list);
3586                 sp->do_auto_asconf = 0;
3587         } else if (val && !sp->do_auto_asconf) {
3588                 list_add_tail(&sp->auto_asconf_list,
3589                     &sock_net(sk)->sctp.auto_asconf_splist);
3590                 sp->do_auto_asconf = 1;
3591         }
3592         return 0;
3593 }
3594 
3595 /*
3596  * SCTP_PEER_ADDR_THLDS
3597  *
3598  * This option allows us to alter the partially failed threshold for one or all
3599  * transports in an association.  See Section 6.1 of:
3600  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3601  */
3602 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3603                                             char __user *optval,
3604                                             unsigned int optlen)
3605 {
3606         struct sctp_paddrthlds val;
3607         struct sctp_transport *trans;
3608         struct sctp_association *asoc;
3609 
3610         if (optlen < sizeof(struct sctp_paddrthlds))
3611                 return -EINVAL;
3612         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3613                            sizeof(struct sctp_paddrthlds)))
3614                 return -EFAULT;
3615 
3616 
3617         if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3618                 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3619                 if (!asoc)
3620                         return -ENOENT;
3621                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3622                                     transports) {
3623                         if (val.spt_pathmaxrxt)
3624                                 trans->pathmaxrxt = val.spt_pathmaxrxt;
3625                         trans->pf_retrans = val.spt_pathpfthld;
3626                 }
3627 
3628                 if (val.spt_pathmaxrxt)
3629                         asoc->pathmaxrxt = val.spt_pathmaxrxt;
3630                 asoc->pf_retrans = val.spt_pathpfthld;
3631         } else {
3632                 trans = sctp_addr_id2transport(sk, &val.spt_address,
3633                                                val.spt_assoc_id);
3634                 if (!trans)
3635                         return -ENOENT;
3636 
3637                 if (val.spt_pathmaxrxt)
3638                         trans->pathmaxrxt = val.spt_pathmaxrxt;
3639                 trans->pf_retrans = val.spt_pathpfthld;
3640         }
3641 
3642         return 0;
3643 }
3644 
3645 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3646                                        char __user *optval,
3647                                        unsigned int optlen)
3648 {
3649         int val;
3650 
3651         if (optlen < sizeof(int))
3652                 return -EINVAL;
3653         if (get_user(val, (int __user *) optval))
3654                 return -EFAULT;
3655 
3656         sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3657 
3658         return 0;
3659 }
3660 
3661 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3662                                        char __user *optval,
3663                                        unsigned int optlen)
3664 {
3665         int val;
3666 
3667         if (optlen < sizeof(int))
3668                 return -EINVAL;
3669         if (get_user(val, (int __user *) optval))
3670                 return -EFAULT;
3671 
3672         sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3673 
3674         return 0;
3675 }
3676 
3677 /* API 6.2 setsockopt(), getsockopt()
3678  *
3679  * Applications use setsockopt() and getsockopt() to set or retrieve
3680  * socket options.  Socket options are used to change the default
3681  * behavior of sockets calls.  They are described in Section 7.
3682  *
3683  * The syntax is:
3684  *
3685  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
3686  *                    int __user *optlen);
3687  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3688  *                    int optlen);
3689  *
3690  *   sd      - the socket descript.
3691  *   level   - set to IPPROTO_SCTP for all SCTP options.
3692  *   optname - the option name.
3693  *   optval  - the buffer to store the value of the option.
3694  *   optlen  - the size of the buffer.
3695  */
3696 static int sctp_setsockopt(struct sock *sk, int level, int optname,
3697                            char __user *optval, unsigned int optlen)
3698 {
3699         int retval = 0;
3700 
3701         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
3702 
3703         /* I can hardly begin to describe how wrong this is.  This is
3704          * so broken as to be worse than useless.  The API draft
3705          * REALLY is NOT helpful here...  I am not convinced that the
3706          * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3707          * are at all well-founded.
3708          */
3709         if (level != SOL_SCTP) {
3710                 struct sctp_af *af = sctp_sk(sk)->pf->af;
3711                 retval = af->setsockopt(sk, level, optname, optval, optlen);
3712                 goto out_nounlock;
3713         }
3714 
3715         lock_sock(sk);
3716 
3717         switch (optname) {
3718         case SCTP_SOCKOPT_BINDX_ADD:
3719                 /* 'optlen' is the size of the addresses buffer. */
3720                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3721                                                optlen, SCTP_BINDX_ADD_ADDR);
3722                 break;
3723 
3724         case SCTP_SOCKOPT_BINDX_REM:
3725                 /* 'optlen' is the size of the addresses buffer. */
3726                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3727                                                optlen, SCTP_BINDX_REM_ADDR);
3728                 break;
3729 
3730         case SCTP_SOCKOPT_CONNECTX_OLD:
3731                 /* 'optlen' is the size of the addresses buffer. */
3732                 retval = sctp_setsockopt_connectx_old(sk,
3733                                             (struct sockaddr __user *)optval,
3734                                             optlen);
3735                 break;
3736 
3737         case SCTP_SOCKOPT_CONNECTX:
3738                 /* 'optlen' is the size of the addresses buffer. */
3739                 retval = sctp_setsockopt_connectx(sk,
3740                                             (struct sockaddr __user *)optval,
3741                                             optlen);
3742                 break;
3743 
3744         case SCTP_DISABLE_FRAGMENTS:
3745                 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3746                 break;
3747 
3748         case SCTP_EVENTS:
3749                 retval = sctp_setsockopt_events(sk, optval, optlen);
3750                 break;
3751 
3752         case SCTP_AUTOCLOSE:
3753                 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3754                 break;
3755 
3756         case SCTP_PEER_ADDR_PARAMS:
3757                 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3758                 break;
3759 
3760         case SCTP_DELAYED_SACK:
3761                 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3762                 break;
3763         case SCTP_PARTIAL_DELIVERY_POINT:
3764                 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3765                 break;
3766 
3767         case SCTP_INITMSG:
3768                 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3769                 break;
3770         case SCTP_DEFAULT_SEND_PARAM:
3771                 retval = sctp_setsockopt_default_send_param(sk, optval,
3772                                                             optlen);
3773                 break;
3774         case SCTP_DEFAULT_SNDINFO:
3775                 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
3776                 break;
3777         case SCTP_PRIMARY_ADDR:
3778                 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3779                 break;
3780         case SCTP_SET_PEER_PRIMARY_ADDR:
3781                 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3782                 break;
3783         case SCTP_NODELAY:
3784                 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3785                 break;
3786         case SCTP_RTOINFO:
3787                 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3788                 break;
3789         case SCTP_ASSOCINFO:
3790                 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3791                 break;
3792         case SCTP_I_WANT_MAPPED_V4_ADDR:
3793                 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3794                 break;
3795         case SCTP_MAXSEG:
3796                 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3797                 break;
3798         case SCTP_ADAPTATION_LAYER:
3799                 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3800                 break;
3801         case SCTP_CONTEXT:
3802                 retval = sctp_setsockopt_context(sk, optval, optlen);
3803                 break;
3804         case SCTP_FRAGMENT_INTERLEAVE:
3805                 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3806                 break;
3807         case SCTP_MAX_BURST:
3808                 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3809                 break;
3810         case SCTP_AUTH_CHUNK:
3811                 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3812                 break;
3813         case SCTP_HMAC_IDENT:
3814                 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3815                 break;
3816         case SCTP_AUTH_KEY:
3817                 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3818                 break;
3819         case SCTP_AUTH_ACTIVE_KEY:
3820                 retval = sctp_setsockopt_active_key(sk, optval, optlen);
3821                 break;
3822         case SCTP_AUTH_DELETE_KEY:
3823                 retval = sctp_setsockopt_del_key(sk, optval, optlen);
3824                 break;
3825         case SCTP_AUTO_ASCONF:
3826                 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3827                 break;
3828         case SCTP_PEER_ADDR_THLDS:
3829                 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3830                 break;
3831         case SCTP_RECVRCVINFO:
3832                 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
3833                 break;
3834         case SCTP_RECVNXTINFO:
3835                 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
3836                 break;
3837         default:
3838                 retval = -ENOPROTOOPT;
3839                 break;
3840         }
3841 
3842         release_sock(sk);
3843 
3844 out_nounlock:
3845         return retval;
3846 }
3847 
3848 /* API 3.1.6 connect() - UDP Style Syntax
3849  *
3850  * An application may use the connect() call in the UDP model to initiate an
3851  * association without sending data.
3852  *
3853  * The syntax is:
3854  *
3855  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3856  *
3857  * sd: the socket descriptor to have a new association added to.
3858  *
3859  * nam: the address structure (either struct sockaddr_in or struct
3860  *    sockaddr_in6 defined in RFC2553 [7]).
3861  *
3862  * len: the size of the address.
3863  */
3864 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
3865                         int addr_len)
3866 {
3867         int err = 0;
3868         struct sctp_af *af;
3869 
3870         lock_sock(sk);
3871 
3872         pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
3873                  addr, addr_len);
3874 
3875         /* Validate addr_len before calling common connect/connectx routine. */
3876         af = sctp_get_af_specific(addr->sa_family);
3877         if (!af || addr_len < af->sockaddr_len) {
3878                 err = -EINVAL;
3879         } else {
3880                 /* Pass correct addr len to common routine (so it knows there
3881                  * is only one address being passed.
3882                  */
3883                 err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3884         }
3885 
3886         release_sock(sk);
3887         return err;
3888 }
3889 
3890 /* FIXME: Write comments. */
3891 static int sctp_disconnect(struct sock *sk, int flags)
3892 {
3893         return -EOPNOTSUPP; /* STUB */
3894 }
3895 
3896 /* 4.1.4 accept() - TCP Style Syntax
3897  *
3898  * Applications use accept() call to remove an established SCTP
3899  * association from the accept queue of the endpoint.  A new socket
3900  * descriptor will be returned from accept() to represent the newly
3901  * formed association.
3902  */
3903 static struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3904 {
3905         struct sctp_sock *sp;
3906         struct sctp_endpoint *ep;
3907         struct sock *newsk = NULL;
3908         struct sctp_association *asoc;
3909         long timeo;
3910         int error = 0;
3911 
3912         lock_sock(sk);
3913 
3914         sp = sctp_sk(sk);
3915         ep = sp->ep;
3916 
3917         if (!sctp_style(sk, TCP)) {
3918                 error = -EOPNOTSUPP;
3919                 goto out;
3920         }
3921 
3922         if (!sctp_sstate(sk, LISTENING)) {
3923                 error = -EINVAL;
3924                 goto out;
3925         }
3926 
3927         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3928 
3929         error = sctp_wait_for_accept(sk, timeo);
3930         if (error)
3931                 goto out;
3932 
3933         /* We treat the list of associations on the endpoint as the accept
3934          * queue and pick the first association on the list.
3935          */
3936         asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3937 
3938         newsk = sp->pf->create_accept_sk(sk, asoc);
3939         if (!newsk) {
3940                 error = -ENOMEM;
3941                 goto out;
3942         }
3943 
3944         /* Populate the fields of the newsk from the oldsk and migrate the
3945          * asoc to the newsk.
3946          */
3947         sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3948 
3949 out:
3950         release_sock(sk);
3951         *err = error;
3952         return newsk;
3953 }
3954 
3955 /* The SCTP ioctl handler. */
3956 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3957 {
3958         int rc = -ENOTCONN;
3959 
3960         lock_sock(sk);
3961 
3962         /*
3963          * SEQPACKET-style sockets in LISTENING state are valid, for
3964          * SCTP, so only discard TCP-style sockets in LISTENING state.
3965          */
3966         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3967                 goto out;
3968 
3969         switch (cmd) {
3970         case SIOCINQ: {
3971                 struct sk_buff *skb;
3972                 unsigned int amount = 0;
3973 
3974                 skb = skb_peek(&sk->sk_receive_queue);
3975                 if (skb != NULL) {
3976                         /*
3977                          * We will only return the amount of this packet since
3978                          * that is all that will be read.
3979                          */
3980                         amount = skb->len;
3981                 }
3982                 rc = put_user(amount, (int __user *)arg);
3983                 break;
3984         }
3985         default:
3986                 rc = -ENOIOCTLCMD;
3987                 break;
3988         }
3989 out:
3990         release_sock(sk);
3991         return rc;
3992 }
3993 
3994 /* This is the function which gets called during socket creation to
3995  * initialized the SCTP-specific portion of the sock.
3996  * The sock structure should already be zero-filled memory.
3997  */
3998 static int sctp_init_sock(struct sock *sk)
3999 {
4000         struct net *net = sock_net(sk);
4001         struct sctp_sock *sp;
4002 
4003         pr_debug("%s: sk:%p\n", __func__, sk);
4004 
4005         sp = sctp_sk(sk);
4006 
4007         /* Initialize the SCTP per socket area.  */
4008         switch (sk->sk_type) {
4009         case SOCK_SEQPACKET:
4010                 sp->type = SCTP_SOCKET_UDP;
4011                 break;
4012         case SOCK_STREAM:
4013                 sp->type = SCTP_SOCKET_TCP;
4014                 break;
4015         default:
4016                 return -ESOCKTNOSUPPORT;
4017         }
4018 
4019         /* Initialize default send parameters. These parameters can be
4020          * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4021          */
4022         sp->default_stream = 0;
4023         sp->default_ppid = 0;
4024         sp->default_flags = 0;
4025         sp->default_context = 0;
4026         sp->default_timetolive = 0;
4027 
4028         sp->default_rcv_context = 0;
4029         sp->max_burst = net->sctp.max_burst;
4030 
4031         sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4032 
4033         /* Initialize default setup parameters. These parameters
4034          * can be modified with the SCTP_INITMSG socket option or
4035          * overridden by the SCTP_INIT CMSG.
4036          */
4037         sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
4038         sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4039         sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
4040         sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4041 
4042         /* Initialize default RTO related parameters.  These parameters can
4043          * be modified for with the SCTP_RTOINFO socket option.
4044          */
4045         sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4046         sp->rtoinfo.srto_max     = net->sctp.rto_max;
4047         sp->rtoinfo.srto_min     = net->sctp.rto_min;
4048 
4049         /* Initialize default association related parameters. These parameters
4050          * can be modified with the SCTP_ASSOCINFO socket option.
4051          */
4052         sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4053         sp->assocparams.sasoc_number_peer_destinations = 0;
4054         sp->assocparams.sasoc_peer_rwnd = 0;
4055         sp->assocparams.sasoc_local_rwnd = 0;
4056         sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4057 
4058         /* Initialize default event subscriptions. By default, all the
4059          * options are off.
4060          */
4061         memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4062 
4063         /* Default Peer Address Parameters.  These defaults can
4064          * be modified via SCTP_PEER_ADDR_PARAMS
4065          */
4066         sp->hbinterval  = net->sctp.hb_interval;
4067         sp->pathmaxrxt  = net->sctp.max_retrans_path;
4068         sp->pathmtu     = 0; /* allow default discovery */
4069         sp->sackdelay   = net->sctp.sack_timeout;
4070         sp->sackfreq    = 2;
4071         sp->param_flags = SPP_HB_ENABLE |
4072                           SPP_PMTUD_ENABLE |
4073                           SPP_SACKDELAY_ENABLE;
4074 
4075         /* If enabled no SCTP message fragmentation will be performed.
4076          * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4077          */
4078         sp->disable_fragments = 0;
4079 
4080         /* Enable Nagle algorithm by default.  */
4081         sp->nodelay           = 0;
4082 
4083         sp->recvrcvinfo = 0;
4084         sp->recvnxtinfo = 0;
4085 
4086         /* Enable by default. */
4087         sp->v4mapped          = 1;
4088 
4089         /* Auto-close idle associations after the configured
4090          * number of seconds.  A value of 0 disables this
4091          * feature.  Configure through the SCTP_AUTOCLOSE socket option,
4092          * for UDP-style sockets only.
4093          */
4094         sp->autoclose         = 0;
4095 
4096         /* User specified fragmentation limit. */
4097         sp->user_frag         = 0;
4098 
4099         sp->adaptation_ind = 0;
4100 
4101         sp->pf = sctp_get_pf_specific(sk->sk_family);
4102 
4103         /* Control variables for partial data delivery. */
4104         atomic_set(&sp->pd_mode, 0);
4105         skb_queue_head_init(&sp->pd_lobby);
4106         sp->frag_interleave = 0;
4107 
4108         /* Create a per socket endpoint structure.  Even if we
4109          * change the data structure relationships, this may still
4110          * be useful for storing pre-connect address information.
4111          */
4112         sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4113         if (!sp->ep)
4114                 return -ENOMEM;
4115 
4116         sp->hmac = NULL;
4117 
4118         sk->sk_destruct = sctp_destruct_sock;
4119 
4120         SCTP_DBG_OBJCNT_INC(sock);
4121 
4122         local_bh_disable();
4123         percpu_counter_inc(&sctp_sockets_allocated);
4124         sock_prot_inuse_add(net, sk->sk_prot, 1);
4125         if (net->sctp.default_auto_asconf) {
4126                 list_add_tail(&sp->auto_asconf_list,
4127                     &net->sctp.auto_asconf_splist);
4128                 sp->do_auto_asconf = 1;
4129         } else
4130                 sp->do_auto_asconf = 0;
4131         local_bh_enable();
4132 
4133         return 0;
4134 }
4135 
4136 /* Cleanup any SCTP per socket resources.  */
4137 static void sctp_destroy_sock(struct sock *sk)
4138 {
4139         struct sctp_sock *sp;
4140 
4141         pr_debug("%s: sk:%p\n", __func__, sk);
4142 
4143         /* Release our hold on the endpoint. */
4144         sp = sctp_sk(sk);
4145         /* This could happen during socket init, thus we bail out
4146          * early, since the rest of the below is not setup either.
4147          */
4148         if (sp->ep == NULL)
4149                 return;
4150 
4151         if (sp->do_auto_asconf) {
4152                 sp->do_auto_asconf = 0;
4153                 list_del(&sp->auto_asconf_list);
4154         }
4155         sctp_endpoint_free(sp->ep);
4156         local_bh_disable();
4157         percpu_counter_dec(&sctp_sockets_allocated);
4158         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4159         local_bh_enable();
4160 }
4161 
4162 /* Triggered when there are no references on the socket anymore */
4163 static void sctp_destruct_sock(struct sock *sk)
4164 {
4165         struct sctp_sock *sp = sctp_sk(sk);
4166 
4167         /* Free up the HMAC transform. */
4168         crypto_free_hash(sp->hmac);
4169 
4170         inet_sock_destruct(sk);
4171 }
4172 
4173 /* API 4.1.7 shutdown() - TCP Style Syntax
4174  *     int shutdown(int socket, int how);
4175  *
4176  *     sd      - the socket descriptor of the association to be closed.
4177  *     how     - Specifies the type of shutdown.  The  values  are
4178  *               as follows:
4179  *               SHUT_RD
4180  *                     Disables further receive operations. No SCTP
4181  *                     protocol action is taken.
4182  *               SHUT_WR
4183  *                     Disables further send operations, and initiates
4184  *                     the SCTP shutdown sequence.
4185  *               SHUT_RDWR
4186  *                     Disables further send  and  receive  operations
4187  *                     and initiates the SCTP shutdown sequence.
4188  */
4189 static void sctp_shutdown(struct sock *sk, int how)
4190 {
4191         struct net *net = sock_net(sk);
4192         struct sctp_endpoint *ep;
4193         struct sctp_association *asoc;
4194 
4195         if (!sctp_style(sk, TCP))
4196                 return;
4197 
4198         if (how & SEND_SHUTDOWN) {
4199                 ep = sctp_sk(sk)->ep;
4200                 if (!list_empty(&ep->asocs)) {
4201                         asoc = list_entry(ep->asocs.next,
4202                                           struct sctp_association, asocs);
4203                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
4204                 }
4205         }
4206 }
4207 
4208 /* 7.2.1 Association Status (SCTP_STATUS)
4209 
4210  * Applications can retrieve current status information about an
4211  * association, including association state, peer receiver window size,
4212  * number of unacked data chunks, and number of data chunks pending
4213  * receipt.  This information is read-only.
4214  */
4215 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4216                                        char __user *optval,
4217                                        int __user *optlen)
4218 {
4219         struct sctp_status status;
4220         struct sctp_association *asoc = NULL;
4221         struct sctp_transport *transport;
4222         sctp_assoc_t associd;
4223         int retval = 0;
4224 
4225         if (len < sizeof(status)) {
4226                 retval = -EINVAL;
4227                 goto out;
4228         }
4229 
4230         len = sizeof(status);
4231         if (copy_from_user(&status, optval, len)) {
4232                 retval = -EFAULT;
4233                 goto out;
4234         }
4235 
4236         associd = status.sstat_assoc_id;
4237         asoc = sctp_id2assoc(sk, associd);
4238         if (!asoc) {
4239                 retval = -EINVAL;
4240                 goto out;
4241         }
4242 
4243         transport = asoc->peer.primary_path;
4244 
4245         status.sstat_assoc_id = sctp_assoc2id(asoc);
4246         status.sstat_state = sctp_assoc_to_state(asoc);
4247         status.sstat_rwnd =  asoc->peer.rwnd;
4248         status.sstat_unackdata = asoc->unack_data;
4249 
4250         status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4251         status.sstat_instrms = asoc->c.sinit_max_instreams;
4252         status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4253         status.sstat_fragmentation_point = asoc->frag_point;
4254         status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4255         memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4256                         transport->af_specific->sockaddr_len);
4257         /* Map ipv4 address into v4-mapped-on-v6 address.  */
4258         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
4259                 (union sctp_addr *)&status.sstat_primary.spinfo_address);
4260         status.sstat_primary.spinfo_state = transport->state;
4261         status.sstat_primary.spinfo_cwnd = transport->cwnd;
4262         status.sstat_primary.spinfo_srtt = transport->srtt;
4263         status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4264         status.sstat_primary.spinfo_mtu = transport->pathmtu;
4265 
4266         if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4267                 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4268 
4269         if (put_user(len, optlen)) {
4270                 retval = -EFAULT;
4271                 goto out;
4272         }
4273 
4274         pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
4275                  __func__, len, status.sstat_state, status.sstat_rwnd,
4276                  status.sstat_assoc_id);
4277 
4278         if (copy_to_user(optval, &status, len)) {
4279                 retval = -EFAULT;
4280                 goto out;
4281         }
4282 
4283 out:
4284         return retval;
4285 }
4286 
4287 
4288 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4289  *
4290  * Applications can retrieve information about a specific peer address
4291  * of an association, including its reachability state, congestion
4292  * window, and retransmission timer values.  This information is
4293  * read-only.
4294  */
4295 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4296                                           char __user *optval,
4297                                           int __user *optlen)
4298 {
4299         struct sctp_paddrinfo pinfo;
4300         struct sctp_transport *transport;
4301         int retval = 0;
4302 
4303         if (len < sizeof(pinfo)) {
4304                 retval = -EINVAL;
4305                 goto out;
4306         }
4307 
4308         len = sizeof(pinfo);
4309         if (copy_from_user(&pinfo, optval, len)) {
4310                 retval = -EFAULT;
4311                 goto out;
4312         }
4313 
4314         transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4315                                            pinfo.spinfo_assoc_id);
4316         if (!transport)
4317                 return -EINVAL;
4318 
4319         pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4320         pinfo.spinfo_state = transport->state;
4321         pinfo.spinfo_cwnd = transport->cwnd;
4322         pinfo.spinfo_srtt = transport->srtt;
4323         pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4324         pinfo.spinfo_mtu = transport->pathmtu;
4325 
4326         if (pinfo.spinfo_state == SCTP_UNKNOWN)
4327                 pinfo.spinfo_state = SCTP_ACTIVE;
4328 
4329         if (put_user(len, optlen)) {
4330                 retval = -EFAULT;
4331                 goto out;
4332         }
4333 
4334         if (copy_to_user(optval, &pinfo, len)) {
4335                 retval = -EFAULT;
4336                 goto out;
4337         }
4338 
4339 out:
4340         return retval;
4341 }
4342 
4343 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4344  *
4345  * This option is a on/off flag.  If enabled no SCTP message
4346  * fragmentation will be performed.  Instead if a message being sent
4347  * exceeds the current PMTU size, the message will NOT be sent and
4348  * instead a error will be indicated to the user.
4349  */
4350 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4351                                         char __user *optval, int __user *optlen)
4352 {
4353         int val;
4354 
4355         if (len < sizeof(int))
4356                 return -EINVAL;
4357 
4358         len = sizeof(int);
4359         val = (sctp_sk(sk)->disable_fragments == 1);
4360         if (put_user(len, optlen))
4361                 return -EFAULT;
4362         if (copy_to_user(optval, &val, len))
4363                 return -EFAULT;
4364         return 0;
4365 }
4366 
4367 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4368  *
4369  * This socket option is used to specify various notifications and
4370  * ancillary data the user wishes to receive.
4371  */
4372 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4373                                   int __user *optlen)
4374 {
4375         if (len <= 0)
4376                 return -EINVAL;
4377         if (len > sizeof(struct sctp_event_subscribe))
4378                 len = sizeof(struct sctp_event_subscribe);
4379         if (put_user(len, optlen))
4380                 return -EFAULT;
4381         if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4382                 return -EFAULT;
4383         return 0;
4384 }
4385 
4386 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4387  *
4388  * This socket option is applicable to the UDP-style socket only.  When
4389  * set it will cause associations that are idle for more than the
4390  * specified number of seconds to automatically close.  An association
4391  * being idle is defined an association that has NOT sent or received
4392  * user data.  The special value of '' indicates that no automatic
4393  * close of any associations should be performed.  The option expects an
4394  * integer defining the number of seconds of idle time before an
4395  * association is closed.
4396  */
4397 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4398 {
4399         /* Applicable to UDP-style socket only */
4400         if (sctp_style(sk, TCP))
4401                 return -EOPNOTSUPP;
4402         if (len < sizeof(int))
4403                 return -EINVAL;
4404         len = sizeof(int);
4405         if (put_user(len, optlen))
4406                 return -EFAULT;
4407         if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4408                 return -EFAULT;
4409         return 0;
4410 }
4411 
4412 /* Helper routine to branch off an association to a new socket.  */
4413 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4414 {
4415         struct sctp_association *asoc = sctp_id2assoc(sk, id);
4416         struct sctp_sock *sp = sctp_sk(sk);
4417         struct socket *sock;
4418         int err = 0;
4419 
4420         if (!asoc)
4421                 return -EINVAL;
4422 
4423         /* An association cannot be branched off from an already peeled-off
4424          * socket, nor is this supported for tcp style sockets.
4425          */
4426         if (!sctp_style(sk, UDP))
4427                 return -EINVAL;
4428 
4429         /* Create a new socket.  */
4430         err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4431         if (err < 0)
4432                 return err;
4433 
4434         sctp_copy_sock(sock->sk, sk, asoc);
4435 
4436         /* Make peeled-off sockets more like 1-1 accepted sockets.
4437          * Set the daddr and initialize id to something more random
4438          */
4439         sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
4440 
4441         /* Populate the fields of the newsk from the oldsk and migrate the
4442          * asoc to the newsk.
4443          */
4444         sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4445 
4446         *sockp = sock;
4447 
4448         return err;
4449 }
4450 EXPORT_SYMBOL(sctp_do_peeloff);
4451 
4452 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4453 {
4454         sctp_peeloff_arg_t peeloff;
4455         struct socket *newsock;
4456         struct file *newfile;
4457         int retval = 0;
4458 
4459         if (len < sizeof(sctp_peeloff_arg_t))
4460                 return -EINVAL;
4461         len = sizeof(sctp_peeloff_arg_t);
4462         if (copy_from_user(&peeloff, optval, len))
4463                 return -EFAULT;
4464 
4465         retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4466         if (retval < 0)
4467                 goto out;
4468 
4469         /* Map the socket to an unused fd that can be returned to the user.  */
4470         retval = get_unused_fd_flags(0);
4471         if (retval < 0) {
4472                 sock_release(newsock);
4473                 goto out;
4474         }
4475 
4476         newfile = sock_alloc_file(newsock, 0, NULL);
4477         if (unlikely(IS_ERR(newfile))) {
4478                 put_unused_fd(retval);
4479                 sock_release(newsock);
4480                 return PTR_ERR(newfile);
4481         }
4482 
4483         pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
4484                  retval);
4485 
4486         /* Return the fd mapped to the new socket.  */
4487         if (put_user(len, optlen)) {
4488                 fput(newfile);
4489                 put_unused_fd(retval);
4490                 return -EFAULT;
4491         }
4492         peeloff.sd = retval;
4493         if (copy_to_user(optval, &peeloff, len)) {
4494                 fput(newfile);
4495                 put_unused_fd(retval);
4496                 return -EFAULT;
4497         }
4498         fd_install(retval, newfile);
4499 out:
4500         return retval;
4501 }
4502 
4503 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4504  *
4505  * Applications can enable or disable heartbeats for any peer address of
4506  * an association, modify an address's heartbeat interval, force a
4507  * heartbeat to be sent immediately, and adjust the address's maximum
4508  * number of retransmissions sent before an address is considered
4509  * unreachable.  The following structure is used to access and modify an
4510  * address's parameters:
4511  *
4512  *  struct sctp_paddrparams {
4513  *     sctp_assoc_t            spp_assoc_id;
4514  *     struct sockaddr_storage spp_address;
4515  *     uint32_t                spp_hbinterval;
4516  *     uint16_t                spp_pathmaxrxt;
4517  *     uint32_t                spp_pathmtu;
4518  *     uint32_t                spp_sackdelay;
4519  *     uint32_t                spp_flags;
4520  * };
4521  *
4522  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
4523  *                     application, and identifies the association for
4524  *                     this query.
4525  *   spp_address     - This specifies which address is of interest.
4526  *   spp_hbinterval  - This contains the value of the heartbeat interval,
4527  *                     in milliseconds.  If a  value of zero
4528  *                     is present in this field then no changes are to
4529  *                     be made to this parameter.
4530  *   spp_pathmaxrxt  - This contains the maximum number of
4531  *                     retransmissions before this address shall be
4532  *                     considered unreachable. If a  value of zero
4533  *                     is present in this field then no changes are to
4534  *                     be made to this parameter.
4535  *   spp_pathmtu     - When Path MTU discovery is disabled the value
4536  *                     specified here will be the "fixed" path mtu.
4537  *                     Note that if the spp_address field is empty
4538  *                     then all associations on this address will
4539  *                     have this fixed path mtu set upon them.
4540  *
4541  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
4542  *                     the number of milliseconds that sacks will be delayed
4543  *                     for. This value will apply to all addresses of an
4544  *                     association if the spp_address field is empty. Note
4545  *                     also, that if delayed sack is enabled and this
4546  *                     value is set to 0, no change is made to the last
4547  *                     recorded delayed sack timer value.
4548  *
4549  *   spp_flags       - These flags are used to control various features
4550  *                     on an association. The flag field may contain
4551  *                     zero or more of the following options.
4552  *
4553  *                     SPP_HB_ENABLE  - Enable heartbeats on the
4554  *                     specified address. Note that if the address
4555  *                     field is empty all addresses for the association
4556  *                     have heartbeats enabled upon them.
4557  *
4558  *                     SPP_HB_DISABLE - Disable heartbeats on the
4559  *                     speicifed address. Note that if the address
4560  *                     field is empty all addresses for the association
4561  *                     will have their heartbeats disabled. Note also
4562  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
4563  *                     mutually exclusive, only one of these two should
4564  *                     be specified. Enabling both fields will have
4565  *                     undetermined results.
4566  *
4567  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
4568  *                     to be made immediately.
4569  *
4570  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
4571  *                     discovery upon the specified address. Note that
4572  *                     if the address feild is empty then all addresses
4573  *                     on the association are effected.
4574  *
4575  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
4576  *                     discovery upon the specified address. Note that
4577  *                     if the address feild is empty then all addresses
4578  *                     on the association are effected. Not also that
4579  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4580  *                     exclusive. Enabling both will have undetermined
4581  *                     results.
4582  *
4583  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
4584  *                     on delayed sack. The time specified in spp_sackdelay
4585  *                     is used to specify the sack delay for this address. Note
4586  *                     that if spp_address is empty then all addresses will
4587  *                     enable delayed sack and take on the sack delay
4588  *                     value specified in spp_sackdelay.
4589  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
4590  *                     off delayed sack. If the spp_address field is blank then
4591  *                     delayed sack is disabled for the entire association. Note
4592  *                     also that this field is mutually exclusive to
4593  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
4594  *                     results.
4595  */
4596 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4597                                             char __user *optval, int __user *optlen)
4598 {
4599         struct sctp_paddrparams  params;
4600         struct sctp_transport   *trans = NULL;
4601         struct sctp_association *asoc = NULL;
4602         struct sctp_sock        *sp = sctp_sk(sk);
4603 
4604         if (len < sizeof(struct sctp_paddrparams))
4605                 return -EINVAL;
4606         len = sizeof(struct sctp_paddrparams);
4607         if (copy_from_user(&params, optval, len))
4608                 return -EFAULT;
4609 
4610         /* If an address other than INADDR_ANY is specified, and
4611          * no transport is found, then the request is invalid.
4612          */
4613         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
4614                 trans = sctp_addr_id2transport(sk, &params.spp_address,
4615                                                params.spp_assoc_id);
4616                 if (!trans) {
4617                         pr_debug("%s: failed no transport\n", __func__);
4618                         return -EINVAL;
4619                 }
4620         }
4621 
4622         /* Get association, if assoc_id != 0 and the socket is a one
4623          * to many style socket, and an association was not found, then
4624          * the id was invalid.
4625          */
4626         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4627         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4628                 pr_debug("%s: failed no association\n", __func__);
4629                 return -EINVAL;
4630         }
4631 
4632         if (trans) {
4633                 /* Fetch transport values. */
4634                 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4635                 params.spp_pathmtu    = trans->pathmtu;
4636                 params.spp_pathmaxrxt = trans->pathmaxrxt;
4637                 params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
4638 
4639                 /*draft-11 doesn't say what to return in spp_flags*/
4640                 params.spp_flags      = trans->param_flags;
4641         } else if (asoc) {
4642                 /* Fetch association values. */
4643                 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4644                 params.spp_pathmtu    = asoc->pathmtu;
4645                 params.spp_pathmaxrxt = asoc->pathmaxrxt;
4646                 params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
4647 
4648                 /*draft-11 doesn't say what to return in spp_flags*/
4649                 params.spp_flags      = asoc->param_flags;
4650         } else {
4651                 /* Fetch socket values. */
4652                 params.spp_hbinterval = sp->hbinterval;
4653                 params.spp_pathmtu    = sp->pathmtu;
4654                 params.spp_sackdelay  = sp->sackdelay;
4655                 params.spp_pathmaxrxt = sp->pathmaxrxt;
4656 
4657                 /*draft-11 doesn't say what to return in spp_flags*/
4658                 params.spp_flags      = sp->param_flags;
4659         }
4660 
4661         if (copy_to_user(optval, &params, len))
4662                 return -EFAULT;
4663 
4664         if (put_user(len, optlen))
4665                 return -EFAULT;
4666 
4667         return 0;
4668 }
4669 
4670 /*
4671  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
4672  *
4673  * This option will effect the way delayed acks are performed.  This
4674  * option allows you to get or set the delayed ack time, in
4675  * milliseconds.  It also allows changing the delayed ack frequency.
4676  * Changing the frequency to 1 disables the delayed sack algorithm.  If
4677  * the assoc_id is 0, then this sets or gets the endpoints default
4678  * values.  If the assoc_id field is non-zero, then the set or get
4679  * effects the specified association for the one to many model (the
4680  * assoc_id field is ignored by the one to one model).  Note that if
4681  * sack_delay or sack_freq are 0 when setting this option, then the
4682  * current values will remain unchanged.
4683  *
4684  * struct sctp_sack_info {
4685  *     sctp_assoc_t            sack_assoc_id;
4686  *     uint32_t                sack_delay;
4687  *     uint32_t                sack_freq;
4688  * };
4689  *
4690  * sack_assoc_id -  This parameter, indicates which association the user
4691  *    is performing an action upon.  Note that if this field's value is
4692  *    zero then the endpoints default value is changed (effecting future
4693  *    associations only).
4694  *
4695  * sack_delay -  This parameter contains the number of milliseconds that
4696  *    the user is requesting the delayed ACK timer be set to.  Note that
4697  *    this value is defined in the standard to be between 200 and 500
4698  *    milliseconds.
4699  *
4700  * sack_freq -  This parameter contains the number of packets that must
4701  *    be received before a sack is sent without waiting for the delay
4702  *    timer to expire.  The default value for this is 2, setting this
4703  *    value to 1 will disable the delayed sack algorithm.
4704  */
4705 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4706                                             char __user *optval,
4707                                             int __user *optlen)
4708 {
4709         struct sctp_sack_info    params;
4710         struct sctp_association *asoc = NULL;
4711         struct sctp_sock        *sp = sctp_sk(sk);
4712 
4713         if (len >= sizeof(struct sctp_sack_info)) {
4714                 len = sizeof(struct sctp_sack_info);
4715 
4716                 if (copy_from_user(&params, optval, len))
4717                         return -EFAULT;
4718         } else if (len == sizeof(struct sctp_assoc_value)) {
4719                 pr_warn_ratelimited(DEPRECATED
4720                                     "%s (pid %d) "
4721                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
4722                                     "Use struct sctp_sack_info instead\n",
4723                                     current->comm, task_pid_nr(current));
4724                 if (copy_from_user(&params, optval, len))
4725                         return -EFAULT;
4726         } else
4727                 return -EINVAL;
4728 
4729         /* Get association, if sack_assoc_id != 0 and the socket is a one
4730          * to many style socket, and an association was not found, then
4731          * the id was invalid.
4732          */
4733         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4734         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4735                 return -EINVAL;
4736 
4737         if (asoc) {
4738                 /* Fetch association values. */
4739                 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4740                         params.sack_delay = jiffies_to_msecs(
4741                                 asoc->sackdelay);
4742                         params.sack_freq = asoc->sackfreq;
4743 
4744                 } else {
4745                         params.sack_delay = 0;
4746                         params.sack_freq = 1;
4747                 }
4748         } else {
4749                 /* Fetch socket values. */
4750                 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4751                         params.sack_delay  = sp->sackdelay;
4752                         params.sack_freq = sp->sackfreq;
4753                 } else {
4754                         params.sack_delay  = 0;
4755                         params.sack_freq = 1;
4756                 }
4757         }
4758 
4759         if (copy_to_user(optval, &params, len))
4760                 return -EFAULT;
4761 
4762         if (put_user(len, optlen))
4763                 return -EFAULT;
4764 
4765         return 0;
4766 }
4767 
4768 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4769  *
4770  * Applications can specify protocol parameters for the default association
4771  * initialization.  The option name argument to setsockopt() and getsockopt()
4772  * is SCTP_INITMSG.
4773  *
4774  * Setting initialization parameters is effective only on an unconnected
4775  * socket (for UDP-style sockets only future associations are effected
4776  * by the change).  With TCP-style sockets, this option is inherited by
4777  * sockets derived from a listener socket.
4778  */
4779 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4780 {
4781         if (len < sizeof(struct sctp_initmsg))
4782                 return -EINVAL;
4783         len = sizeof(struct sctp_initmsg);
4784         if (put_user(len, optlen))
4785                 return -EFAULT;
4786         if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4787                 return -EFAULT;
4788         return 0;
4789 }
4790 
4791 
4792 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4793                                       char __user *optval, int __user *optlen)
4794 {
4795         struct sctp_association *asoc;
4796         int cnt = 0;
4797         struct sctp_getaddrs getaddrs;
4798         struct sctp_transport *from;
4799         void __user *to;
4800         union sctp_addr temp;
4801         struct sctp_sock *sp = sctp_sk(sk);
4802         int addrlen;
4803         size_t space_left;
4804         int bytes_copied;
4805 
4806         if (len < sizeof(struct sctp_getaddrs))
4807                 return -EINVAL;
4808 
4809         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4810                 return -EFAULT;
4811 
4812         /* For UDP-style sockets, id specifies the association to query.  */
4813         asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4814         if (!asoc)
4815                 return -EINVAL;
4816 
4817         to = optval + offsetof(struct sctp_getaddrs, addrs);
4818         space_left = len - offsetof(struct sctp_getaddrs, addrs);
4819 
4820         list_for_each_entry(from, &asoc->peer.transport_addr_list,
4821                                 transports) {
4822                 memcpy(&temp, &from->ipaddr, sizeof(temp));
4823                 addrlen = sctp_get_pf_specific(sk->sk_family)
4824                               ->addr_to_user(sp, &temp);
4825                 if (space_left < addrlen)
4826                         return -ENOMEM;
4827                 if (copy_to_user(to, &temp, addrlen))
4828                         return -EFAULT;
4829                 to += addrlen;
4830                 cnt++;
4831                 space_left -= addrlen;
4832         }
4833 
4834         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4835                 return -EFAULT;
4836         bytes_copied = ((char __user *)to) - optval;
4837         if (put_user(bytes_copied, optlen))
4838                 return -EFAULT;
4839 
4840         return 0;
4841 }
4842 
4843 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4844                             size_t space_left, int *bytes_copied)
4845 {
4846         struct sctp_sockaddr_entry *addr;
4847         union sctp_addr temp;
4848         int cnt = 0;
4849         int addrlen;
4850         struct net *net = sock_net(sk);
4851 
4852         rcu_read_lock();
4853         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4854                 if (!addr->valid)
4855                         continue;
4856 
4857                 if ((PF_INET == sk->sk_family) &&
4858                     (AF_INET6 == addr->a.sa.sa_family))
4859                         continue;
4860                 if ((PF_INET6 == sk->sk_family) &&
4861                     inet_v6_ipv6only(sk) &&
4862                     (AF_INET == addr->a.sa.sa_family))
4863                         continue;
4864                 memcpy(&temp, &addr->a, sizeof(temp));
4865                 if (!temp.v4.sin_port)
4866                         temp.v4.sin_port = htons(port);
4867 
4868                 addrlen = sctp_get_pf_specific(sk->sk_family)
4869                               ->addr_to_user(sctp_sk(sk), &temp);
4870 
4871                 if (space_left < addrlen) {
4872                         cnt =  -ENOMEM;
4873                         break;
4874                 }
4875                 memcpy(to, &temp, addrlen);
4876 
4877                 to += addrlen;
4878                 cnt++;
4879                 space_left -= addrlen;
4880                 *bytes_copied += addrlen;
4881         }
4882         rcu_read_unlock();
4883 
4884         return cnt;
4885 }
4886 
4887 
4888 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4889                                        char __user *optval, int __user *optlen)
4890 {
4891         struct sctp_bind_addr *bp;
4892         struct sctp_association *asoc;
4893         int cnt = 0;
4894         struct sctp_getaddrs getaddrs;
4895         struct sctp_sockaddr_entry *addr;
4896         void __user *to;
4897         union sctp_addr temp;
4898         struct sctp_sock *sp = sctp_sk(sk);
4899         int addrlen;
4900         int err = 0;
4901         size_t space_left;
4902         int bytes_copied = 0;
4903         void *addrs;
4904         void *buf;
4905 
4906         if (len < sizeof(struct sctp_getaddrs))
4907                 return -EINVAL;
4908 
4909         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4910                 return -EFAULT;
4911 
4912         /*
4913          *  For UDP-style sockets, id specifies the association to query.
4914          *  If the id field is set to the value '' then the locally bound
4915          *  addresses are returned without regard to any particular
4916          *  association.
4917          */
4918         if (0 == getaddrs.assoc_id) {
4919                 bp = &sctp_sk(sk)->ep->base.bind_addr;
4920         } else {
4921                 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4922                 if (!asoc)
4923                         return -EINVAL;
4924                 bp = &asoc->base.bind_addr;
4925         }
4926 
4927         to = optval + offsetof(struct sctp_getaddrs, addrs);
4928         space_left = len - offsetof(struct sctp_getaddrs, addrs);
4929 
4930         addrs = kmalloc(space_left, GFP_KERNEL);
4931         if (!addrs)
4932                 return -ENOMEM;
4933 
4934         /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4935          * addresses from the global local address list.
4936          */
4937         if (sctp_list_single_entry(&bp->address_list)) {
4938                 addr = list_entry(bp->address_list.next,
4939                                   struct sctp_sockaddr_entry, list);
4940                 if (sctp_is_any(sk, &addr->a)) {
4941                         cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4942                                                 space_left, &bytes_copied);
4943                         if (cnt < 0) {
4944                                 err = cnt;
4945                                 goto out;
4946                         }
4947                         goto copy_getaddrs;
4948                 }
4949         }
4950 
4951         buf = addrs;
4952         /* Protection on the bound address list is not needed since
4953          * in the socket option context we hold a socket lock and
4954          * thus the bound address list can't change.
4955          */
4956         list_for_each_entry(addr, &bp->address_list, list) {
4957                 memcpy(&temp, &addr->a, sizeof(temp));
4958                 addrlen = sctp_get_pf_specific(sk->sk_family)
4959                               ->addr_to_user(sp, &temp);
4960                 if (space_left < addrlen) {
4961                         err =  -ENOMEM; /*fixme: right error?*/
4962                         goto out;
4963                 }
4964                 memcpy(buf, &temp, addrlen);
4965                 buf += addrlen;
4966                 bytes_copied += addrlen;
4967                 cnt++;
4968                 space_left -= addrlen;
4969         }
4970 
4971 copy_getaddrs:
4972         if (copy_to_user(to, addrs, bytes_copied)) {
4973                 err = -EFAULT;
4974                 goto out;
4975         }
4976         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4977                 err = -EFAULT;
4978                 goto out;
4979         }
4980         if (put_user(bytes_copied, optlen))
4981                 err = -EFAULT;
4982 out:
4983         kfree(addrs);
4984         return err;
4985 }
4986 
4987 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4988  *
4989  * Requests that the local SCTP stack use the enclosed peer address as
4990  * the association primary.  The enclosed address must be one of the
4991  * association peer's addresses.
4992  */
4993 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4994                                         char __user *optval, int __user *optlen)
4995 {
4996         struct sctp_prim prim;
4997         struct sctp_association *asoc;
4998         struct sctp_sock *sp = sctp_sk(sk);
4999 
5000         if (len < sizeof(struct sctp_prim))
5001                 return -EINVAL;
5002 
5003         len = sizeof(struct sctp_prim);
5004 
5005         if (copy_from_user(&prim, optval, len))
5006                 return -EFAULT;
5007 
5008         asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
5009         if (!asoc)
5010                 return -EINVAL;
5011 
5012         if (!asoc->peer.primary_path)
5013                 return -ENOTCONN;
5014 
5015         memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
5016                 asoc->peer.primary_path->af_specific->sockaddr_len);
5017 
5018         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
5019                         (union sctp_addr *)&prim.ssp_addr);
5020 
5021         if (put_user(len, optlen))
5022                 return -EFAULT;
5023         if (copy_to_user(optval, &prim, len))
5024                 return -EFAULT;
5025 
5026         return 0;
5027 }
5028 
5029 /*
5030  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
5031  *
5032  * Requests that the local endpoint set the specified Adaptation Layer
5033  * Indication parameter for all future INIT and INIT-ACK exchanges.
5034  */
5035 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
5036                                   char __user *optval, int __user *optlen)
5037 {
5038         struct sctp_setadaptation adaptation;
5039 
5040         if (len < sizeof(struct sctp_setadaptation))
5041                 return -EINVAL;
5042 
5043         len = sizeof(struct sctp_setadaptation);
5044 
5045         adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5046 
5047         if (put_user(len, optlen))
5048                 return -EFAULT;
5049         if (copy_to_user(optval, &adaptation, len))
5050                 return -EFAULT;
5051 
5052         return 0;
5053 }
5054 
5055 /*
5056  *
5057  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
5058  *
5059  *   Applications that wish to use the sendto() system call may wish to
5060  *   specify a default set of parameters that would normally be supplied
5061  *   through the inclusion of ancillary data.  This socket option allows
5062  *   such an application to set the default sctp_sndrcvinfo structure.
5063 
5064 
5065  *   The application that wishes to use this socket option simply passes
5066  *   in to this call the sctp_sndrcvinfo structure defined in Section
5067  *   5.2.2) The input parameters accepted by this call include
5068  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
5069  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
5070  *   to this call if the caller is using the UDP model.
5071  *
5072  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
5073  */
5074 static int sctp_getsockopt_default_send_param(struct sock *sk,
5075                                         int len, char __user *optval,
5076                                         int __user *optlen)
5077 {
5078         struct sctp_sock *sp = sctp_sk(sk);
5079         struct sctp_association *asoc;
5080         struct sctp_sndrcvinfo info;
5081 
5082         if (len < sizeof(info))
5083                 return -EINVAL;
5084 
5085         len = sizeof(info);
5086 
5087         if (copy_from_user(&info, optval, len))
5088                 return -EFAULT;
5089 
5090         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
5091         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
5092                 return -EINVAL;
5093         if (asoc) {
5094                 info.sinfo_stream = asoc->default_stream;
5095                 info.sinfo_flags = asoc->default_flags;
5096                 info.sinfo_ppid = asoc->default_ppid;
5097                 info.sinfo_context = asoc->default_context;
5098                 info.sinfo_timetolive = asoc->default_timetolive;
5099         } else {
5100                 info.sinfo_stream = sp->default_stream;
5101                 info.sinfo_flags = sp->default_flags;
5102                 info.sinfo_ppid = sp->default_ppid;
5103                 info.sinfo_context = sp->default_context;
5104                 info.sinfo_timetolive = sp->default_timetolive;
5105         }
5106 
5107         if (put_user(len, optlen))
5108                 return -EFAULT;
5109         if (copy_to_user(optval, &info, len))
5110                 return -EFAULT;
5111 
5112         return 0;
5113 }
5114 
5115 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
5116  * (SCTP_DEFAULT_SNDINFO)
5117  */
5118 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
5119                                            char __user *optval,
5120                                            int __user *optlen)
5121 {
5122         struct sctp_sock *sp = sctp_sk(sk);
5123         struct sctp_association *asoc;
5124         struct sctp_sndinfo info;
5125 
5126         if (len < sizeof(info))
5127                 return -EINVAL;
5128 
5129         len = sizeof(info);
5130 
5131         if (copy_from_user(&info, optval, len))
5132                 return -EFAULT;
5133 
5134         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
5135         if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
5136                 return -EINVAL;
5137         if (asoc) {
5138                 info.snd_sid = asoc->default_stream;
5139                 info.snd_flags = asoc->default_flags;
5140                 info.snd_ppid = asoc->default_ppid;
5141                 info.snd_context = asoc->default_context;
5142         } else {
5143                 info.snd_sid = sp->default_stream;
5144                 info.snd_flags = sp->default_flags;
5145                 info.snd_ppid = sp->default_ppid;
5146                 info.snd_context = sp->default_context;
5147         }
5148 
5149         if (put_user(len, optlen))
5150                 return -EFAULT;
5151         if (copy_to_user(optval, &info, len))
5152                 return -EFAULT;
5153 
5154         return 0;
5155 }
5156 
5157 /*
5158  *
5159  * 7.1.5 SCTP_NODELAY
5160  *
5161  * Turn on/off any Nagle-like algorithm.  This means that packets are
5162  * generally sent as soon as possible and no unnecessary delays are
5163  * introduced, at the cost of more packets in the network.  Expects an
5164  * integer boolean flag.
5165  */
5166 
5167 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
5168                                    char __user *optval, int __user *optlen)
5169 {
5170         int val;
5171 
5172         if (len < sizeof(int))
5173                 return -EINVAL;
5174 
5175         len = sizeof(int);
5176         val = (sctp_sk(sk)->nodelay == 1);
5177         if (put_user(len, optlen))
5178                 return -EFAULT;
5179         if (copy_to_user(optval, &val, len))
5180                 return -EFAULT;
5181         return 0;
5182 }
5183 
5184 /*
5185  *
5186  * 7.1.1 SCTP_RTOINFO
5187  *
5188  * The protocol parameters used to initialize and bound retransmission
5189  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
5190  * and modify these parameters.
5191  * All parameters are time values, in milliseconds.  A value of 0, when
5192  * modifying the parameters, indicates that the current value should not
5193  * be changed.
5194  *
5195  */
5196 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
5197                                 char __user *optval,
5198                                 int __user *optlen) {
5199         struct sctp_rtoinfo rtoinfo;
5200         struct sctp_association *asoc;
5201 
5202         if (len < sizeof (struct sctp_rtoinfo))
5203                 return -EINVAL;
5204 
5205         len = sizeof(struct sctp_rtoinfo);
5206 
5207         if (copy_from_user(&rtoinfo, optval, len))
5208                 return -EFAULT;
5209 
5210         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5211 
5212         if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5213                 return -EINVAL;
5214 
5215         /* Values corresponding to the specific association. */
5216         if (asoc) {
5217                 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5218                 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5219                 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5220         } else {
5221                 /* Values corresponding to the endpoint. */
5222                 struct sctp_sock *sp = sctp_sk(sk);
5223 
5224                 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5225                 rtoinfo.srto_max = sp->rtoinfo.srto_max;
5226                 rtoinfo.srto_min = sp->rtoinfo.srto_min;
5227         }
5228 
5229         if (put_user(len, optlen))
5230                 return -EFAULT;
5231 
5232         if (copy_to_user(optval, &rtoinfo, len))
5233                 return -EFAULT;
5234 
5235         return 0;
5236 }
5237 
5238 /*
5239  *
5240  * 7.1.2 SCTP_ASSOCINFO
5241  *
5242  * This option is used to tune the maximum retransmission attempts
5243  * of the association.
5244  * Returns an error if the new association retransmission value is
5245  * greater than the sum of the retransmission value  of the peer.
5246  * See [SCTP] for more information.
5247  *
5248  */
5249 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5250                                      char __user *optval,
5251                                      int __user *optlen)
5252 {
5253 
5254         struct sctp_assocparams assocparams;
5255         struct sctp_association *asoc;
5256         struct list_head *pos;
5257         int cnt = 0;
5258 
5259         if (len < sizeof (struct sctp_assocparams))
5260                 return -EINVAL;
5261 
5262         len = sizeof(struct sctp_assocparams);
5263 
5264         if (copy_from_user(&assocparams, optval, len))
5265                 return -EFAULT;
5266 
5267         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5268 
5269         if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5270                 return -EINVAL;
5271 
5272         /* Values correspoinding to the specific association */
5273         if (asoc) {
5274                 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5275                 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5276                 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5277                 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
5278 
5279                 list_for_each(pos, &asoc->peer.transport_addr_list) {
5280                         cnt++;
5281                 }
5282 
5283                 assocparams.sasoc_number_peer_destinations = cnt;
5284         } else {
5285                 /* Values corresponding to the endpoint */
5286                 struct sctp_sock *sp = sctp_sk(sk);
5287 
5288                 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5289                 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5290                 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5291                 assocparams.sasoc_cookie_life =
5292                                         sp->assocparams.sasoc_cookie_life;
5293                 assocparams.sasoc_number_peer_destinations =
5294                                         sp->assocparams.
5295                                         sasoc_number_peer_destinations;
5296         }
5297 
5298         if (put_user(len, optlen))
5299                 return -EFAULT;
5300 
5301         if (copy_to_user(optval, &assocparams, len))
5302                 return -EFAULT;
5303 
5304         return 0;
5305 }
5306 
5307 /*
5308  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5309  *
5310  * This socket option is a boolean flag which turns on or off mapped V4
5311  * addresses.  If this option is turned on and the socket is type
5312  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5313  * If this option is turned off, then no mapping will be done of V4
5314  * addresses and a user will receive both PF_INET6 and PF_INET type
5315  * addresses on the socket.
5316  */
5317 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5318                                     char __user *optval, int __user *optlen)
5319 {
5320         int val;
5321         struct sctp_sock *sp = sctp_sk(sk);
5322 
5323         if (len < sizeof(int))
5324                 return -EINVAL;
5325 
5326         len = sizeof(int);
5327         val = sp->v4mapped;
5328         if (put_user(len, optlen))
5329                 return -EFAULT;
5330         if (copy_to_user(optval, &val, len))
5331                 return -EFAULT;
5332 
5333         return 0;
5334 }
5335 
5336 /*
5337  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
5338  * (chapter and verse is quoted at sctp_setsockopt_context())
5339  */
5340 static int sctp_getsockopt_context(struct sock *sk, int len,
5341                                    char __user *optval, int __user *optlen)
5342 {
5343         struct sctp_assoc_value params;
5344         struct sctp_sock *sp;
5345         struct sctp_association *asoc;
5346 
5347         if (len < sizeof(struct sctp_assoc_value))
5348                 return -EINVAL;
5349 
5350         len = sizeof(struct sctp_assoc_value);
5351 
5352         if (copy_from_user(&params, optval, len))
5353                 return -EFAULT;
5354 
5355         sp = sctp_sk(sk);
5356 
5357         if (params.assoc_id != 0) {
5358                 asoc = sctp_id2assoc(sk, params.assoc_id);
5359                 if (!asoc)
5360                         return -EINVAL;
5361                 params.assoc_value = asoc->default_rcv_context;
5362         } else {
5363                 params.assoc_value = sp->default_rcv_context;
5364         }
5365 
5366         if (put_user(len, optlen))
5367                 return -EFAULT;
5368         if (copy_to_user(optval, &params, len))
5369                 return -EFAULT;
5370 
5371         return 0;
5372 }
5373 
5374 /*
5375  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5376  * This option will get or set the maximum size to put in any outgoing
5377  * SCTP DATA chunk.  If a message is larger than this size it will be
5378  * fragmented by SCTP into the specified size.  Note that the underlying
5379  * SCTP implementation may fragment into smaller sized chunks when the
5380  * PMTU of the underlying association is smaller than the value set by
5381  * the user.  The default value for this option is '' which indicates
5382  * the user is NOT limiting fragmentation and only the PMTU will effect
5383  * SCTP's choice of DATA chunk size.  Note also that values set larger
5384  * than the maximum size of an IP datagram will effectively let SCTP
5385  * control fragmentation (i.e. the same as setting this option to 0).
5386  *
5387  * The following structure is used to access and modify this parameter:
5388  *
5389  * struct sctp_assoc_value {
5390  *   sctp_assoc_t assoc_id;
5391  *   uint32_t assoc_value;
5392  * };
5393  *
5394  * assoc_id:  This parameter is ignored for one-to-one style sockets.
5395  *    For one-to-many style sockets this parameter indicates which
5396  *    association the user is performing an action upon.  Note that if
5397  *    this field's value is zero then the endpoints default value is
5398  *    changed (effecting future associations only).
5399  * assoc_value:  This parameter specifies the maximum size in bytes.
5400  */
5401 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5402                                   char __user *optval, int __user *optlen)
5403 {
5404         struct sctp_assoc_value params;
5405         struct sctp_association *asoc;
5406 
5407         if (len == sizeof(int)) {
5408                 pr_warn_ratelimited(DEPRECATED
5409                                     "%s (pid %d) "
5410                                     "Use of int in maxseg socket option.\n"
5411                                     "Use struct sctp_assoc_value instead\n",
5412                                     current->comm, task_pid_nr(current));
5413                 params.assoc_id = 0;
5414         } else if (len >= sizeof(struct sctp_assoc_value)) {
5415                 len = sizeof(struct sctp_assoc_value);
5416                 if (copy_from_user(&params, optval, sizeof(params)))
5417                         return -EFAULT;
5418         } else
5419                 return -EINVAL;
5420 
5421         asoc = sctp_id2assoc(sk, params.assoc_id);
5422         if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5423                 return -EINVAL;
5424 
5425         if (asoc)
5426                 params.assoc_value = asoc->frag_point;
5427         else
5428                 params.assoc_value = sctp_sk(sk)->user_frag;
5429 
5430         if (put_user(len, optlen))
5431                 return -EFAULT;
5432         if (len == sizeof(int)) {
5433                 if (copy_to_user(optval, &params.assoc_value, len))
5434                         return -EFAULT;
5435         } else {
5436                 if (copy_to_user(optval, &params, len))
5437                         return -EFAULT;
5438         }
5439 
5440         return 0;
5441 }
5442 
5443 /*
5444  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5445  * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5446  */
5447 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5448                                                char __user *optval, int __user *optlen)
5449 {
5450         int val;
5451 
5452         if (len < sizeof(int))
5453                 return -EINVAL;
5454 
5455         len = sizeof(int);
5456 
5457         val = sctp_sk(sk)->frag_interleave;
5458         if (put_user(len, optlen))
5459                 return -EFAULT;
5460         if (copy_to_user(optval, &val, len))
5461                 return -EFAULT;
5462 
5463         return 0;
5464 }
5465 
5466 /*
5467  * 7.1.25.  Set or Get the sctp partial delivery point
5468  * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5469  */
5470 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5471                                                   char __user *optval,
5472                                                   int __user *optlen)
5473 {
5474         u32 val;
5475 
5476         if (len < sizeof(u32))
5477                 return -EINVAL;
5478 
5479         len = sizeof(u32);
5480 
5481         val = sctp_sk(sk)->pd_point;
5482         if (put_user(len, optlen))
5483                 return -EFAULT;
5484         if (copy_to_user(optval, &val, len))
5485                 return -EFAULT;
5486 
5487         return 0;
5488 }
5489 
5490 /*
5491  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
5492  * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5493  */
5494 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5495                                     char __user *optval,
5496                                     int __user *optlen)
5497 {
5498         struct sctp_assoc_value params;
5499         struct sctp_sock *sp;
5500         struct sctp_association *asoc;
5501 
5502         if (len == sizeof(int)) {
5503                 pr_warn_ratelimited(DEPRECATED
5504                                     "%s (pid %d) "
5505                                     "Use of int in max_burst socket option.\n"
5506                                     "Use struct sctp_assoc_value instead\n",
5507                                     current->comm, task_pid_nr(current));
5508                 params.assoc_id = 0;
5509         } else if (len >= sizeof(struct sctp_assoc_value)) {
5510                 len = sizeof(struct sctp_assoc_value);
5511                 if (copy_from_user(&params, optval, len))
5512                         return -EFAULT;
5513         } else
5514                 return -EINVAL;
5515 
5516         sp = sctp_sk(sk);
5517 
5518         if (params.assoc_id != 0) {
5519                 asoc = sctp_id2assoc(sk, params.assoc_id);
5520                 if (!asoc)
5521                         return -EINVAL;
5522                 params.assoc_value = asoc->max_burst;
5523         } else
5524                 params.assoc_value = sp->max_burst;
5525 
5526         if (len == sizeof(int)) {
5527                 if (copy_to_user(optval, &params.assoc_value, len))
5528                         return -EFAULT;
5529         } else {
5530                 if (copy_to_user(optval, &params, len))
5531                         return -EFAULT;
5532         }
5533 
5534         return 0;
5535 
5536 }
5537 
5538 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5539                                     char __user *optval, int __user *optlen)
5540 {
5541         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5542         struct sctp_hmacalgo  __user *p = (void __user *)optval;
5543         struct sctp_hmac_algo_param *hmacs;
5544         __u16 data_len = 0;
5545         u32 num_idents;
5546 
5547         if (!ep->auth_enable)
5548                 return -EACCES;
5549 
5550         hmacs = ep->auth_hmacs_list;
5551         data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5552 
5553         if (len < sizeof(struct sctp_hmacalgo) + data_len)
5554                 return -EINVAL;
5555 
5556         len = sizeof(struct sctp_hmacalgo) + data_len;
5557         num_idents = data_len / sizeof(u16);
5558 
5559         if (put_user(len, optlen))
5560                 return -EFAULT;
5561         if (put_user(num_idents, &p->shmac_num_idents))
5562                 return -EFAULT;
5563         if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5564                 return -EFAULT;
5565         return 0;
5566 }
5567 
5568 static int sctp_getsockopt_active_key(struct sock *sk, int len,
5569                                     char __user *optval, int __user *optlen)
5570 {
5571         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5572         struct sctp_authkeyid val;
5573         struct sctp_association *asoc;
5574 
5575         if (!ep->auth_enable)
5576                 return -EACCES;
5577 
5578         if (len < sizeof(struct sctp_authkeyid))
5579                 return -EINVAL;
5580         if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5581                 return -EFAULT;
5582 
5583         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5584         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5585                 return -EINVAL;
5586 
5587         if (asoc)
5588                 val.scact_keynumber = asoc->active_key_id;
5589         else
5590                 val.scact_keynumber = ep->active_key_id;
5591 
5592         len = sizeof(struct sctp_authkeyid);
5593         if (put_user(len, optlen))
5594                 return -EFAULT;
5595         if (copy_to_user(optval, &val, len))
5596                 return -EFAULT;
5597 
5598         return 0;
5599 }
5600 
5601 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5602                                     char __user *optval, int __user *optlen)
5603 {
5604         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5605         struct sctp_authchunks __user *p = (void __user *)optval;
5606         struct sctp_authchunks val;
5607         struct sctp_association *asoc;
5608         struct sctp_chunks_param *ch;
5609         u32    num_chunks = 0;
5610         char __user *to;
5611 
5612         if (!ep->auth_enable)
5613                 return -EACCES;
5614 
5615         if (len < sizeof(struct sctp_authchunks))
5616                 return -EINVAL;
5617 
5618         if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5619                 return -EFAULT;
5620 
5621         to = p->gauth_chunks;
5622         asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5623         if (!asoc)
5624                 return -EINVAL;
5625 
5626         ch = asoc->peer.peer_chunks;
5627         if (!ch)
5628                 goto num;
5629 
5630         /* See if the user provided enough room for all the data */
5631         num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5632         if (len < num_chunks)
5633                 return -EINVAL;
5634 
5635         if (copy_to_user(to, ch->chunks, num_chunks))
5636                 return -EFAULT;
5637 num:
5638         len = sizeof(struct sctp_authchunks) + num_chunks;
5639         if (put_user(len, optlen))
5640                 return -EFAULT;
5641         if (put_user(num_chunks, &p->gauth_number_of_chunks))
5642                 return -EFAULT;
5643         return 0;
5644 }
5645 
5646 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5647                                     char __user *optval, int __user *optlen)
5648 {
5649         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
5650         struct sctp_authchunks __user *p = (void __user *)optval;
5651         struct sctp_authchunks val;
5652         struct sctp_association *asoc;
5653         struct sctp_chunks_param *ch;
5654         u32    num_chunks = 0;
5655         char __user *to;
5656 
5657         if (!ep->auth_enable)
5658                 return -EACCES;
5659 
5660         if (len < sizeof(struct sctp_authchunks))
5661                 return -EINVAL;
5662 
5663         if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5664                 return -EFAULT;
5665 
5666         to = p->gauth_chunks;
5667         asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5668         if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5669                 return -EINVAL;
5670 
5671         if (asoc)
5672                 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
5673         else
5674                 ch = ep->auth_chunk_list;
5675 
5676         if (!ch)
5677                 goto num;
5678 
5679         num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5680         if (len < sizeof(struct sctp_authchunks) + num_chunks)
5681                 return -EINVAL;
5682 
5683         if (copy_to_user(to, ch->chunks, num_chunks))
5684                 return -EFAULT;
5685 num:
5686         len = sizeof(struct sctp_authchunks) + num_chunks;
5687         if (put_user(len, optlen))
5688                 return -EFAULT;
5689         if (put_user(num_chunks, &p->gauth_number_of_chunks))
5690                 return -EFAULT;
5691 
5692         return 0;
5693 }
5694 
5695 /*
5696  * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5697  * This option gets the current number of associations that are attached
5698  * to a one-to-many style socket.  The option value is an uint32_t.
5699  */
5700 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5701                                     char __user *optval, int __user *optlen)
5702 {
5703         struct sctp_sock *sp = sctp_sk(sk);
5704         struct sctp_association *asoc;
5705         u32 val = 0;
5706 
5707         if (sctp_style(sk, TCP))
5708                 return -EOPNOTSUPP;
5709 
5710         if (len < sizeof(u32))
5711                 return -EINVAL;
5712 
5713         len = sizeof(u32);
5714 
5715         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5716                 val++;
5717         }
5718 
5719         if (put_user(len, optlen))
5720                 return -EFAULT;
5721         if (copy_to_user(optval, &val, len))
5722                 return -EFAULT;
5723 
5724         return 0;
5725 }
5726 
5727 /*
5728  * 8.1.23 SCTP_AUTO_ASCONF
5729  * See the corresponding setsockopt entry as description
5730  */
5731 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5732                                    char __user *optval, int __user *optlen)
5733 {
5734         int val = 0;
5735 
5736         if (len < sizeof(int))
5737                 return -EINVAL;
5738 
5739         len = sizeof(int);
5740         if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5741                 val = 1;
5742         if (put_user(len, optlen))
5743                 return -EFAULT;
5744         if (copy_to_user(optval, &val, len))
5745                 return -EFAULT;
5746         return 0;
5747 }
5748 
5749 /*
5750  * 8.2.6. Get the Current Identifiers of Associations
5751  *        (SCTP_GET_ASSOC_ID_LIST)
5752  *
5753  * This option gets the current list of SCTP association identifiers of
5754  * the SCTP associations handled by a one-to-many style socket.
5755  */
5756 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5757                                     char __user *optval, int __user *optlen)
5758 {
5759         struct sctp_sock *sp = sctp_sk(sk);
5760         struct sctp_association *asoc;
5761         struct sctp_assoc_ids *ids;
5762         u32 num = 0;
5763 
5764         if (sctp_style(sk, TCP))
5765                 return -EOPNOTSUPP;
5766 
5767         if (len < sizeof(struct sctp_assoc_ids))
5768                 return -EINVAL;
5769 
5770         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5771                 num++;
5772         }
5773 
5774         if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5775                 return -EINVAL;
5776 
5777         len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5778 
5779         ids = kmalloc(len, GFP_KERNEL);
5780         if (unlikely(!ids))
5781                 return -ENOMEM;
5782 
5783         ids->gaids_number_of_ids = num;
5784         num = 0;
5785         list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5786                 ids->gaids_assoc_id[num++] = asoc->assoc_id;
5787         }
5788 
5789         if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5790                 kfree(ids);
5791                 return -EFAULT;
5792         }
5793 
5794         kfree(ids);
5795         return 0;
5796 }
5797 
5798 /*
5799  * SCTP_PEER_ADDR_THLDS
5800  *
5801  * This option allows us to fetch the partially failed threshold for one or all
5802  * transports in an association.  See Section 6.1 of:
5803  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5804  */
5805 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5806                                             char __user *optval,
5807                                             int len,
5808                                             int __user *optlen)
5809 {
5810         struct sctp_paddrthlds val;
5811         struct sctp_transport *trans;
5812         struct sctp_association *asoc;
5813 
5814         if (len < sizeof(struct sctp_paddrthlds))
5815                 return -EINVAL;
5816         len = sizeof(struct sctp_paddrthlds);
5817         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
5818                 return -EFAULT;
5819 
5820         if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
5821                 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
5822                 if (!asoc)
5823                         return -ENOENT;
5824 
5825                 val.spt_pathpfthld = asoc->pf_retrans;
5826                 val.spt_pathmaxrxt = asoc->pathmaxrxt;
5827         } else {
5828                 trans = sctp_addr_id2transport(sk, &val.spt_address,
5829                                                val.spt_assoc_id);
5830                 if (!trans)
5831                         return -ENOENT;
5832 
5833                 val.spt_pathmaxrxt = trans->pathmaxrxt;
5834                 val.spt_pathpfthld = trans->pf_retrans;
5835         }
5836 
5837         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
5838                 return -EFAULT;
5839 
5840         return 0;
5841 }
5842 
5843 /*
5844  * SCTP_GET_ASSOC_STATS
5845  *
5846  * This option retrieves local per endpoint statistics. It is modeled
5847  * after OpenSolaris' implementation
5848  */
5849 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
5850                                        char __user *optval,
5851                                        int __user *optlen)
5852 {
5853         struct sctp_assoc_stats sas;
5854         struct sctp_association *asoc = NULL;
5855 
5856         /* User must provide at least the assoc id */
5857         if (len < sizeof(sctp_assoc_t))
5858                 return -EINVAL;
5859 
5860         /* Allow the struct to grow and fill in as much as possible */
5861         len = min_t(size_t, len, sizeof(sas));
5862 
5863         if (copy_from_user(&sas, optval, len))
5864                 return -EFAULT;
5865 
5866         asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
5867         if (!asoc)
5868                 return -EINVAL;
5869 
5870         sas.sas_rtxchunks = asoc->stats.rtxchunks;
5871         sas.sas_gapcnt = asoc->stats.gapcnt;
5872         sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
5873         sas.sas_osacks = asoc->stats.osacks;
5874         sas.sas_isacks = asoc->stats.isacks;
5875         sas.sas_octrlchunks = asoc->stats.octrlchunks;
5876         sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
5877         sas.sas_oodchunks = asoc->stats.oodchunks;
5878         sas.sas_iodchunks = asoc->stats.iodchunks;
5879         sas.sas_ouodchunks = asoc->stats.ouodchunks;
5880         sas.sas_iuodchunks = asoc->stats.iuodchunks;
5881         sas.sas_idupchunks = asoc->stats.idupchunks;
5882         sas.sas_opackets = asoc->stats.opackets;
5883         sas.sas_ipackets = asoc->stats.ipackets;
5884 
5885         /* New high max rto observed, will return 0 if not a single
5886          * RTO update took place. obs_rto_ipaddr will be bogus
5887          * in such a case
5888          */
5889         sas.sas_maxrto = asoc->stats.max_obs_rto;
5890         memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
5891                 sizeof(struct sockaddr_storage));
5892 
5893         /* Mark beginning of a new observation period */
5894         asoc->stats.max_obs_rto = asoc->rto_min;
5895 
5896         if (put_user(len, optlen))
5897                 return -EFAULT;
5898 
5899         pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
5900 
5901         if (copy_to_user(optval, &sas, len))
5902                 return -EFAULT;
5903 
5904         return 0;
5905 }
5906 
5907 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
5908                                        char __user *optval,
5909                                        int __user *optlen)
5910 {
5911         int val = 0;
5912 
5913         if (len < sizeof(int))
5914                 return -EINVAL;
5915 
5916         len = sizeof(int);
5917         if (sctp_sk(sk)->recvrcvinfo)
5918                 val = 1;
5919         if (put_user(len, optlen))
5920                 return -EFAULT;
5921         if (copy_to_user(optval, &val, len))
5922                 return -EFAULT;
5923 
5924         return 0;
5925 }
5926 
5927 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
5928                                        char __user *optval,
5929                                        int __user *optlen)
5930 {
5931         int val = 0;
5932 
5933         if (len < sizeof(int))
5934                 return -EINVAL;
5935 
5936         len = sizeof(int);
5937         if (sctp_sk(sk)->recvnxtinfo)
5938                 val = 1;
5939         if (put_user(len, optlen))
5940                 return -EFAULT;
5941         if (copy_to_user(optval, &val, len))
5942                 return -EFAULT;
5943 
5944         return 0;
5945 }
5946 
5947 static int sctp_getsockopt(struct sock *sk, int level, int optname,
5948                            char __user *optval, int __user *optlen)
5949 {
5950         int retval = 0;
5951         int len;
5952 
5953         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
5954 
5955         /* I can hardly begin to describe how wrong this is.  This is
5956          * so broken as to be worse than useless.  The API draft
5957          * REALLY is NOT helpful here...  I am not convinced that the
5958          * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
5959          * are at all well-founded.
5960          */
5961         if (level != SOL_SCTP) {
5962                 struct sctp_af *af = sctp_sk(sk)->pf->af;
5963 
5964                 retval = af->getsockopt(sk, level, optname, optval, optlen);
5965                 return retval;
5966         }
5967 
5968         if (get_user(len, optlen))
5969                 return -EFAULT;
5970 
5971         lock_sock(sk);
5972 
5973         switch (optname) {
5974         case SCTP_STATUS:
5975                 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
5976                 break;
5977         case SCTP_DISABLE_FRAGMENTS:
5978                 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
5979                                                            optlen);
5980                 break;
5981         case SCTP_EVENTS:
5982                 retval = sctp_getsockopt_events(sk, len, optval, optlen);
5983                 break;
5984         case SCTP_AUTOCLOSE:
5985                 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
5986                 break;
5987         case SCTP_SOCKOPT_PEELOFF:
5988                 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
5989                 break;
5990         case SCTP_PEER_ADDR_PARAMS:
5991                 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
5992                                                           optlen);
5993                 break;
5994         case SCTP_DELAYED_SACK:
5995                 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
5996                                                           optlen);
5997                 break;
5998         case SCTP_INITMSG:
5999                 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
6000                 break;
6001         case SCTP_GET_PEER_ADDRS:
6002                 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
6003                                                     optlen);
6004                 break;
6005         case SCTP_GET_LOCAL_ADDRS:
6006                 retval = sctp_getsockopt_local_addrs(sk, len, optval,
6007                                                      optlen);
6008                 break;
6009         case SCTP_SOCKOPT_CONNECTX3:
6010                 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
6011                 break;
6012         case SCTP_DEFAULT_SEND_PARAM:
6013                 retval = sctp_getsockopt_default_send_param(sk, len,
6014                                                             optval, optlen);
6015                 break;
6016         case SCTP_DEFAULT_SNDINFO:
6017                 retval = sctp_getsockopt_default_sndinfo(sk, len,
6018                                                          optval, optlen);
6019                 break;
6020         case SCTP_PRIMARY_ADDR:
6021                 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
6022                 break;
6023         case SCTP_NODELAY:
6024                 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
6025                 break;
6026         case SCTP_RTOINFO:
6027                 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
6028                 break;
6029         case SCTP_ASSOCINFO:
6030                 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
6031                 break;
6032         case SCTP_I_WANT_MAPPED_V4_ADDR:
6033                 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
6034                 break;
6035         case SCTP_MAXSEG:
6036                 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
6037                 break;
6038         case SCTP_GET_PEER_ADDR_INFO:
6039                 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
6040                                                         optlen);
6041                 break;
6042         case SCTP_ADAPTATION_LAYER:
6043                 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
6044                                                         optlen);
6045                 break;
6046         case SCTP_CONTEXT:
6047                 retval = sctp_getsockopt_context(sk, len, optval, optlen);
6048                 break;
6049         case SCTP_FRAGMENT_INTERLEAVE:
6050                 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
6051                                                              optlen);
6052                 break;
6053         case SCTP_PARTIAL_DELIVERY_POINT:
6054                 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
6055                                                                 optlen);
6056                 break;
6057         case SCTP_MAX_BURST:
6058                 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
6059                 break;
6060         case SCTP_AUTH_KEY:
6061         case SCTP_AUTH_CHUNK:
6062         case SCTP_AUTH_DELETE_KEY:
6063                 retval = -EOPNOTSUPP;
6064                 break;
6065         case SCTP_HMAC_IDENT:
6066                 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
6067                 break;
6068         case SCTP_AUTH_ACTIVE_KEY:
6069                 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
6070                 break;
6071         case SCTP_PEER_AUTH_CHUNKS:
6072                 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
6073                                                         optlen);
6074                 break;
6075         case SCTP_LOCAL_AUTH_CHUNKS:
6076                 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
6077                                                         optlen);
6078                 break;
6079         case SCTP_GET_ASSOC_NUMBER:
6080                 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
6081                 break;
6082         case SCTP_GET_ASSOC_ID_LIST:
6083                 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
6084                 break;
6085         case SCTP_AUTO_ASCONF:
6086                 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
6087                 break;
6088         case SCTP_PEER_ADDR_THLDS:
6089                 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
6090                 break;
6091         case SCTP_GET_ASSOC_STATS:
6092                 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
6093                 break;
6094         case SCTP_RECVRCVINFO:
6095                 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
6096                 break;
6097         case SCTP_RECVNXTINFO:
6098                 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
6099                 break;
6100         default:
6101                 retval = -ENOPROTOOPT;
6102                 break;
6103         }
6104 
6105         release_sock(sk);
6106         return retval;
6107 }
6108 
6109 static void sctp_hash(struct sock *sk)
6110 {
6111         /* STUB */
6112 }
6113 
6114 static void sctp_unhash(struct sock *sk)
6115 {
6116         /* STUB */
6117 }
6118 
6119 /* Check if port is acceptable.  Possibly find first available port.
6120  *
6121  * The port hash table (contained in the 'global' SCTP protocol storage
6122  * returned by struct sctp_protocol *sctp_get_protocol()). The hash
6123  * table is an array of 4096 lists (sctp_bind_hashbucket). Each
6124  * list (the list number is the port number hashed out, so as you
6125  * would expect from a hash function, all the ports in a given list have
6126  * such a number that hashes out to the same list number; you were
6127  * expecting that, right?); so each list has a set of ports, with a
6128  * link to the socket (struct sock) that uses it, the port number and
6129  * a fastreuse flag (FIXME: NPI ipg).
6130  */
6131 static struct sctp_bind_bucket *sctp_bucket_create(
6132         struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
6133 
6134 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
6135 {
6136         struct sctp_bind_hashbucket *head; /* hash list */
6137         struct sctp_bind_bucket *pp;
6138         unsigned short snum;
6139         int ret;
6140 
6141         snum = ntohs(addr->v4.sin_port);
6142 
6143         pr_debug("%s: begins, snum:%d\n", __func__, snum);
6144 
6145         local_bh_disable();
6146 
6147         if (snum == 0) {
6148                 /* Search for an available port. */
6149                 int low, high, remaining, index;
6150                 unsigned int rover;
6151                 struct net *net = sock_net(sk);
6152 
6153                 inet_get_local_port_range(net, &low, &high);
6154                 remaining = (high - low) + 1;
6155                 rover = prandom_u32() % remaining + low;
6156 
6157                 do {
6158                         rover++;
6159                         if ((rover < low) || (rover > high))
6160                                 rover = low;
6161                         if (inet_is_local_reserved_port(net, rover))
6162                                 continue;
6163                         index = sctp_phashfn(sock_net(sk), rover);
6164                         head = &sctp_port_hashtable[index];
6165                         spin_lock(&head->lock);
6166                         sctp_for_each_hentry(pp, &head->chain)
6167                                 if ((pp->port == rover) &&
6168                                     net_eq(sock_net(sk), pp->net))
6169                                         goto next;
6170                         break;
6171                 next:
6172                         spin_unlock(&head->lock);
6173                 } while (--remaining > 0);
6174 
6175                 /* Exhausted local port range during search? */
6176                 ret = 1;
6177                 if (remaining <= 0)
6178                         goto fail;
6179 
6180                 /* OK, here is the one we will use.  HEAD (the port
6181                  * hash table list entry) is non-NULL and we hold it's
6182                  * mutex.
6183                  */
6184                 snum = rover;
6185         } else {
6186                 /* We are given an specific port number; we verify
6187                  * that it is not being used. If it is used, we will
6188                  * exahust the search in the hash list corresponding
6189                  * to the port number (snum) - we detect that with the
6190                  * port iterator, pp being NULL.
6191                  */
6192                 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
6193                 spin_lock(&head->lock);
6194                 sctp_for_each_hentry(pp, &head->chain) {
6195                         if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
6196                                 goto pp_found;
6197                 }
6198         }
6199         pp = NULL;
6200         goto pp_not_found;
6201 pp_found:
6202         if (!hlist_empty(&pp->owner)) {
6203                 /* We had a port hash table hit - there is an
6204                  * available port (pp != NULL) and it is being
6205                  * used by other socket (pp->owner not empty); that other
6206                  * socket is going to be sk2.
6207                  */
6208                 int reuse = sk->sk_reuse;
6209                 struct sock *sk2;
6210 
6211                 pr_debug("%s: found a possible match\n", __func__);
6212 
6213                 if (pp->fastreuse && sk->sk_reuse &&
6214                         sk->sk_state != SCTP_SS_LISTENING)
6215                         goto success;
6216 
6217                 /* Run through the list of sockets bound to the port
6218                  * (pp->port) [via the pointers bind_next and
6219                  * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
6220                  * we get the endpoint they describe and run through
6221                  * the endpoint's list of IP (v4 or v6) addresses,
6222                  * comparing each of the addresses with the address of
6223                  * the socket sk. If we find a match, then that means
6224                  * that this port/socket (sk) combination are already
6225                  * in an endpoint.
6226                  */
6227                 sk_for_each_bound(sk2, &pp->owner) {
6228                         struct sctp_endpoint *ep2;
6229                         ep2 = sctp_sk(sk2)->ep;
6230 
6231                         if (sk == sk2 ||
6232                             (reuse && sk2->sk_reuse &&
6233                              sk2->sk_state != SCTP_SS_LISTENING))
6234                                 continue;
6235 
6236                         if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
6237                                                  sctp_sk(sk2), sctp_sk(sk))) {
6238                                 ret = (long)sk2;
6239                                 goto fail_unlock;
6240                         }
6241                 }
6242 
6243                 pr_debug("%s: found a match\n", __func__);
6244         }
6245 pp_not_found:
6246         /* If there was a hash table miss, create a new port.  */
6247         ret = 1;
6248         if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
6249                 goto fail_unlock;
6250 
6251         /* In either case (hit or miss), make sure fastreuse is 1 only
6252          * if sk->sk_reuse is too (that is, if the caller requested
6253          * SO_REUSEADDR on this socket -sk-).
6254          */
6255         if (hlist_empty(&pp->owner)) {
6256                 if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
6257                         pp->fastreuse = 1;
6258                 else
6259                         pp->fastreuse = 0;
6260         } else if (pp->fastreuse &&
6261                 (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
6262                 pp->fastreuse = 0;
6263 
6264         /* We are set, so fill up all the data in the hash table
6265          * entry, tie the socket list information with the rest of the
6266          * sockets FIXME: Blurry, NPI (ipg).
6267          */
6268 success:
6269         if (!sctp_sk(sk)->bind_hash) {
6270                 inet_sk(sk)->inet_num = snum;
6271                 sk_add_bind_node(sk, &pp->owner);
6272                 sctp_sk(sk)->bind_hash = pp;
6273         }
6274         ret = 0;
6275 
6276 fail_unlock:
6277         spin_unlock(&head->lock);
6278 
6279 fail:
6280         local_bh_enable();
6281         return ret;
6282 }
6283 
6284 /* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
6285  * port is requested.
6286  */
6287 static int sctp_get_port(struct sock *sk, unsigned short snum)
6288 {
6289         union sctp_addr addr;
6290         struct sctp_af *af = sctp_sk(sk)->pf->af;
6291 
6292         /* Set up a dummy address struct from the sk. */
6293         af->from_sk(&addr, sk);
6294         addr.v4.sin_port = htons(snum);
6295 
6296         /* Note: sk->sk_num gets filled in if ephemeral port request. */
6297         return !!sctp_get_port_local(sk, &addr);
6298 }
6299 
6300 /*
6301  *  Move a socket to LISTENING state.
6302  */
6303 static int sctp_listen_start(struct sock *sk, int backlog)
6304 {
6305         struct sctp_sock *sp = sctp_sk(sk);
6306         struct sctp_endpoint *ep = sp->ep;
6307         struct crypto_hash *tfm = NULL;
6308         char alg[32];
6309 
6310         /* Allocate HMAC for generating cookie. */
6311         if (!sp->hmac && sp->sctp_hmac_alg) {
6312                 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
6313                 tfm = crypto_alloc_hash(alg, 0, CRYPTO_ALG_ASYNC);
6314                 if (IS_ERR(tfm)) {
6315                         net_info_ratelimited("failed to load transform for %s: %ld\n",
6316                                              sp->sctp_hmac_alg, PTR_ERR(tfm));
6317                         return -ENOSYS;
6318                 }
6319                 sctp_sk(sk)->hmac = tfm;
6320         }
6321 
6322         /*
6323          * If a bind() or sctp_bindx() is not called prior to a listen()
6324          * call that allows new associations to be accepted, the system
6325          * picks an ephemeral port and will choose an address set equivalent
6326          * to binding with a wildcard address.
6327          *
6328          * This is not currently spelled out in the SCTP sockets
6329          * extensions draft, but follows the practice as seen in TCP
6330          * sockets.
6331          *
6332          */
6333         sk->sk_state = SCTP_SS_LISTENING;
6334         if (!ep->base.bind_addr.port) {
6335                 if (sctp_autobind(sk))
6336                         return -EAGAIN;
6337         } else {
6338                 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
6339                         sk->sk_state = SCTP_SS_CLOSED;
6340                         return -EADDRINUSE;
6341                 }
6342         }
6343 
6344         sk->sk_max_ack_backlog = backlog;
6345         sctp_hash_endpoint(ep);
6346         return 0;
6347 }
6348 
6349 /*
6350  * 4.1.3 / 5.1.3 listen()
6351  *
6352  *   By default, new associations are not accepted for UDP style sockets.
6353  *   An application uses listen() to mark a socket as being able to
6354  *   accept new associations.
6355  *
6356  *   On TCP style sockets, applications use listen() to ready the SCTP
6357  *   endpoint for accepting inbound associations.
6358  *
6359  *   On both types of endpoints a backlog of '' disables listening.
6360  *
6361  *  Move a socket to LISTENING state.
6362  */
6363 int sctp_inet_listen(struct socket *sock, int backlog)
6364 {
6365         struct sock *sk = sock->sk;
6366         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6367         int err = -EINVAL;
6368 
6369         if (unlikely(backlog < 0))
6370                 return err;
6371 
6372         lock_sock(sk);
6373 
6374         /* Peeled-off sockets are not allowed to listen().  */
6375         if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
6376                 goto out;
6377 
6378         if (sock->state != SS_UNCONNECTED)
6379                 goto out;
6380 
6381         /* If backlog is zero, disable listening. */
6382         if (!backlog) {
6383                 if (sctp_sstate(sk, CLOSED))
6384                         goto out;
6385 
6386                 err = 0;
6387                 sctp_unhash_endpoint(ep);
6388                 sk->sk_state = SCTP_SS_CLOSED;
6389                 if (sk->sk_reuse)
6390                         sctp_sk(sk)->bind_hash->fastreuse = 1;
6391                 goto out;
6392         }
6393 
6394         /* If we are already listening, just update the backlog */
6395         if (sctp_sstate(sk, LISTENING))
6396                 sk->sk_max_ack_backlog = backlog;
6397         else {
6398                 err = sctp_listen_start(sk, backlog);
6399                 if (err)
6400                         goto out;
6401         }
6402 
6403         err = 0;
6404 out:
6405         release_sock(sk);
6406         return err;
6407 }
6408 
6409 /*
6410  * This function is done by modeling the current datagram_poll() and the
6411  * tcp_poll().  Note that, based on these implementations, we don't
6412  * lock the socket in this function, even though it seems that,
6413  * ideally, locking or some other mechanisms can be used to ensure
6414  * the integrity of the counters (sndbuf and wmem_alloc) used
6415  * in this place.  We assume that we don't need locks either until proven
6416  * otherwise.
6417  *
6418  * Another thing to note is that we include the Async I/O support
6419  * here, again, by modeling the current TCP/UDP code.  We don't have
6420  * a good way to test with it yet.
6421  */
6422 unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
6423 {
6424         struct sock *sk = sock->sk;
6425         struct sctp_sock *sp = sctp_sk(sk);
6426         unsigned int mask;
6427 
6428         poll_wait(file, sk_sleep(sk), wait);
6429 
6430         /* A TCP-style listening socket becomes readable when the accept queue
6431          * is not empty.
6432          */
6433         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
6434                 return (!list_empty(&sp->ep->asocs)) ?
6435                         (POLLIN | POLLRDNORM) : 0;
6436 
6437         mask = 0;
6438 
6439         /* Is there any exceptional events?  */
6440         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
6441                 mask |= POLLERR |
6442                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
6443         if (sk->sk_shutdown & RCV_SHUTDOWN)
6444                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
6445         if (sk->sk_shutdown == SHUTDOWN_MASK)
6446                 mask |= POLLHUP;
6447 
6448         /* Is it readable?  Reconsider this code with TCP-style support.  */
6449         if (!skb_queue_empty(&sk->sk_receive_queue))
6450                 mask |= POLLIN | POLLRDNORM;
6451 
6452         /* The association is either gone or not ready.  */
6453         if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
6454                 return mask;
6455 
6456         /* Is it writable?  */
6457         if (sctp_writeable(sk)) {
6458                 mask |= POLLOUT | POLLWRNORM;
6459         } else {
6460                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
6461                 /*
6462                  * Since the socket is not locked, the buffer
6463                  * might be made available after the writeable check and
6464                  * before the bit is set.  This could cause a lost I/O
6465                  * signal.  tcp_poll() has a race breaker for this race
6466                  * condition.  Based on their implementation, we put
6467                  * in the following code to cover it as well.
6468                  */
6469                 if (sctp_writeable(sk))
6470                         mask |= POLLOUT | POLLWRNORM;
6471         }
6472         return mask;
6473 }
6474 
6475 /********************************************************************
6476  * 2nd Level Abstractions
6477  ********************************************************************/
6478 
6479 static struct sctp_bind_bucket *sctp_bucket_create(
6480         struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
6481 {
6482         struct sctp_bind_bucket *pp;
6483 
6484         pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
6485         if (pp) {
6486                 SCTP_DBG_OBJCNT_INC(bind_bucket);
6487                 pp->port = snum;
6488                 pp->fastreuse = 0;
6489                 INIT_HLIST_HEAD(&pp->owner);
6490                 pp->net = net;
6491                 hlist_add_head(&pp->node, &head->chain);
6492         }
6493         return pp;
6494 }
6495 
6496 /* Caller must hold hashbucket lock for this tb with local BH disabled */
6497 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
6498 {
6499         if (pp && hlist_empty(&pp->owner)) {
6500                 __hlist_del(&pp->node);
6501                 kmem_cache_free(sctp_bucket_cachep, pp);
6502                 SCTP_DBG_OBJCNT_DEC(bind_bucket);
6503         }
6504 }
6505 
6506 /* Release this socket's reference to a local port.  */
6507 static inline void __sctp_put_port(struct sock *sk)
6508 {
6509         struct sctp_bind_hashbucket *head =
6510                 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
6511                                                   inet_sk(sk)->inet_num)];
6512         struct sctp_bind_bucket *pp;
6513 
6514         spin_lock(&head->lock);
6515         pp = sctp_sk(sk)->bind_hash;
6516         __sk_del_bind_node(sk);
6517         sctp_sk(sk)->bind_hash = NULL;
6518         inet_sk(sk)->inet_num = 0;
6519         sctp_bucket_destroy(pp);
6520         spin_unlock(&head->lock);
6521 }
6522 
6523 void sctp_put_port(struct sock *sk)
6524 {
6525         local_bh_disable();
6526         __sctp_put_port(sk);
6527         local_bh_enable