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

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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ 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-3.16.76 ] ~ [ 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 <crypto/hash.h>
 56 #include <linux/types.h>
 57 #include <linux/kernel.h>
 58 #include <linux/wait.h>
 59 #include <linux/time.h>
 60 #include <linux/sched/signal.h>
 61 #include <linux/ip.h>
 62 #include <linux/capability.h>
 63 #include <linux/fcntl.h>
 64 #include <linux/poll.h>
 65 #include <linux/init.h>
 66 #include <linux/slab.h>
 67 #include <linux/file.h>
 68 #include <linux/compat.h>
 69 #include <linux/rhashtable.h>
 70 
 71 #include <net/ip.h>
 72 #include <net/icmp.h>
 73 #include <net/route.h>
 74 #include <net/ipv6.h>
 75 #include <net/inet_common.h>
 76 #include <net/busy_poll.h>
 77 
 78 #include <linux/socket.h> /* for sa_family_t */
 79 #include <linux/export.h>
 80 #include <net/sock.h>
 81 #include <net/sctp/sctp.h>
 82 #include <net/sctp/sm.h>
 83 #include <net/sctp/stream_sched.h>
 84 
 85 /* Forward declarations for internal helper functions. */
 86 static bool sctp_writeable(struct sock *sk);
 87 static void sctp_wfree(struct sk_buff *skb);
 88 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
 89                                 size_t msg_len);
 90 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
 91 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
 92 static int sctp_wait_for_accept(struct sock *sk, long timeo);
 93 static void sctp_wait_for_close(struct sock *sk, long timeo);
 94 static void sctp_destruct_sock(struct sock *sk);
 95 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 96                                         union sctp_addr *addr, int len);
 97 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
 98 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
 99 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
100 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
101 static int sctp_send_asconf(struct sctp_association *asoc,
102                             struct sctp_chunk *chunk);
103 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
104 static int sctp_autobind(struct sock *sk);
105 static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
106                               struct sctp_association *assoc,
107                               enum sctp_socket_type type);
108 
109 static unsigned long sctp_memory_pressure;
110 static atomic_long_t sctp_memory_allocated;
111 struct percpu_counter sctp_sockets_allocated;
112 
113 static void sctp_enter_memory_pressure(struct sock *sk)
114 {
115         sctp_memory_pressure = 1;
116 }
117 
118 
119 /* Get the sndbuf space available at the time on the association.  */
120 static inline int sctp_wspace(struct sctp_association *asoc)
121 {
122         struct sock *sk = asoc->base.sk;
123 
124         return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
125                                        : sk_stream_wspace(sk);
126 }
127 
128 /* Increment the used sndbuf space count of the corresponding association by
129  * the size of the outgoing data chunk.
130  * Also, set the skb destructor for sndbuf accounting later.
131  *
132  * Since it is always 1-1 between chunk and skb, and also a new skb is always
133  * allocated for chunk bundling in sctp_packet_transmit(), we can use the
134  * destructor in the data chunk skb for the purpose of the sndbuf space
135  * tracking.
136  */
137 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
138 {
139         struct sctp_association *asoc = chunk->asoc;
140         struct sock *sk = asoc->base.sk;
141 
142         /* The sndbuf space is tracked per association.  */
143         sctp_association_hold(asoc);
144 
145         if (chunk->shkey)
146                 sctp_auth_shkey_hold(chunk->shkey);
147 
148         skb_set_owner_w(chunk->skb, sk);
149 
150         chunk->skb->destructor = sctp_wfree;
151         /* Save the chunk pointer in skb for sctp_wfree to use later.  */
152         skb_shinfo(chunk->skb)->destructor_arg = chunk;
153 
154         refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
155         asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
156         sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
157         sk_mem_charge(sk, chunk->skb->truesize);
158 }
159 
160 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
161 {
162         skb_orphan(chunk->skb);
163 }
164 
165 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
166                                        void (*cb)(struct sctp_chunk *))
167 
168 {
169         struct sctp_outq *q = &asoc->outqueue;
170         struct sctp_transport *t;
171         struct sctp_chunk *chunk;
172 
173         list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
174                 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
175                         cb(chunk);
176 
177         list_for_each_entry(chunk, &q->retransmit, transmitted_list)
178                 cb(chunk);
179 
180         list_for_each_entry(chunk, &q->sacked, transmitted_list)
181                 cb(chunk);
182 
183         list_for_each_entry(chunk, &q->abandoned, transmitted_list)
184                 cb(chunk);
185 
186         list_for_each_entry(chunk, &q->out_chunk_list, list)
187                 cb(chunk);
188 }
189 
190 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
191                                  void (*cb)(struct sk_buff *, struct sock *))
192 
193 {
194         struct sk_buff *skb, *tmp;
195 
196         sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
197                 cb(skb, sk);
198 
199         sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
200                 cb(skb, sk);
201 
202         sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
203                 cb(skb, sk);
204 }
205 
206 /* Verify that this is a valid address. */
207 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
208                                    int len)
209 {
210         struct sctp_af *af;
211 
212         /* Verify basic sockaddr. */
213         af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
214         if (!af)
215                 return -EINVAL;
216 
217         /* Is this a valid SCTP address?  */
218         if (!af->addr_valid(addr, sctp_sk(sk), NULL))
219                 return -EINVAL;
220 
221         if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
222                 return -EINVAL;
223 
224         return 0;
225 }
226 
227 /* Look up the association by its id.  If this is not a UDP-style
228  * socket, the ID field is always ignored.
229  */
230 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
231 {
232         struct sctp_association *asoc = NULL;
233 
234         /* If this is not a UDP-style socket, assoc id should be ignored. */
235         if (!sctp_style(sk, UDP)) {
236                 /* Return NULL if the socket state is not ESTABLISHED. It
237                  * could be a TCP-style listening socket or a socket which
238                  * hasn't yet called connect() to establish an association.
239                  */
240                 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
241                         return NULL;
242 
243                 /* Get the first and the only association from the list. */
244                 if (!list_empty(&sctp_sk(sk)->ep->asocs))
245                         asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
246                                           struct sctp_association, asocs);
247                 return asoc;
248         }
249 
250         /* Otherwise this is a UDP-style socket. */
251         if (!id || (id == (sctp_assoc_t)-1))
252                 return NULL;
253 
254         spin_lock_bh(&sctp_assocs_id_lock);
255         asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
256         if (asoc && (asoc->base.sk != sk || asoc->base.dead))
257                 asoc = NULL;
258         spin_unlock_bh(&sctp_assocs_id_lock);
259 
260         return asoc;
261 }
262 
263 /* Look up the transport from an address and an assoc id. If both address and
264  * id are specified, the associations matching the address and the id should be
265  * the same.
266  */
267 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
268                                               struct sockaddr_storage *addr,
269                                               sctp_assoc_t id)
270 {
271         struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
272         struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
273         union sctp_addr *laddr = (union sctp_addr *)addr;
274         struct sctp_transport *transport;
275 
276         if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
277                 return NULL;
278 
279         addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
280                                                laddr,
281                                                &transport);
282 
283         if (!addr_asoc)
284                 return NULL;
285 
286         id_asoc = sctp_id2assoc(sk, id);
287         if (id_asoc && (id_asoc != addr_asoc))
288                 return NULL;
289 
290         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
291                                                 (union sctp_addr *)addr);
292 
293         return transport;
294 }
295 
296 /* API 3.1.2 bind() - UDP Style Syntax
297  * The syntax of bind() is,
298  *
299  *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
300  *
301  *   sd      - the socket descriptor returned by socket().
302  *   addr    - the address structure (struct sockaddr_in or struct
303  *             sockaddr_in6 [RFC 2553]),
304  *   addr_len - the size of the address structure.
305  */
306 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
307 {
308         int retval = 0;
309 
310         lock_sock(sk);
311 
312         pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
313                  addr, addr_len);
314 
315         /* Disallow binding twice. */
316         if (!sctp_sk(sk)->ep->base.bind_addr.port)
317                 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
318                                       addr_len);
319         else
320                 retval = -EINVAL;
321 
322         release_sock(sk);
323 
324         return retval;
325 }
326 
327 static long sctp_get_port_local(struct sock *, union sctp_addr *);
328 
329 /* Verify this is a valid sockaddr. */
330 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
331                                         union sctp_addr *addr, int len)
332 {
333         struct sctp_af *af;
334 
335         /* Check minimum size.  */
336         if (len < sizeof (struct sockaddr))
337                 return NULL;
338 
339         if (!opt->pf->af_supported(addr->sa.sa_family, opt))
340                 return NULL;
341 
342         if (addr->sa.sa_family == AF_INET6) {
343                 if (len < SIN6_LEN_RFC2133)
344                         return NULL;
345                 /* V4 mapped address are really of AF_INET family */
346                 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
347                     !opt->pf->af_supported(AF_INET, opt))
348                         return NULL;
349         }
350 
351         /* If we get this far, af is valid. */
352         af = sctp_get_af_specific(addr->sa.sa_family);
353 
354         if (len < af->sockaddr_len)
355                 return NULL;
356 
357         return af;
358 }
359 
360 /* Bind a local address either to an endpoint or to an association.  */
361 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
362 {
363         struct net *net = sock_net(sk);
364         struct sctp_sock *sp = sctp_sk(sk);
365         struct sctp_endpoint *ep = sp->ep;
366         struct sctp_bind_addr *bp = &ep->base.bind_addr;
367         struct sctp_af *af;
368         unsigned short snum;
369         int ret = 0;
370 
371         /* Common sockaddr verification. */
372         af = sctp_sockaddr_af(sp, addr, len);
373         if (!af) {
374                 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
375                          __func__, sk, addr, len);
376                 return -EINVAL;
377         }
378 
379         snum = ntohs(addr->v4.sin_port);
380 
381         pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
382                  __func__, sk, &addr->sa, bp->port, snum, len);
383 
384         /* PF specific bind() address verification. */
385         if (!sp->pf->bind_verify(sp, addr))
386                 return -EADDRNOTAVAIL;
387 
388         /* We must either be unbound, or bind to the same port.
389          * It's OK to allow 0 ports if we are already bound.
390          * We'll just inhert an already bound port in this case
391          */
392         if (bp->port) {
393                 if (!snum)
394                         snum = bp->port;
395                 else if (snum != bp->port) {
396                         pr_debug("%s: new port %d doesn't match existing port "
397                                  "%d\n", __func__, snum, bp->port);
398                         return -EINVAL;
399                 }
400         }
401 
402         if (snum && snum < inet_prot_sock(net) &&
403             !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
404                 return -EACCES;
405 
406         /* See if the address matches any of the addresses we may have
407          * already bound before checking against other endpoints.
408          */
409         if (sctp_bind_addr_match(bp, addr, sp))
410                 return -EINVAL;
411 
412         /* Make sure we are allowed to bind here.
413          * The function sctp_get_port_local() does duplicate address
414          * detection.
415          */
416         addr->v4.sin_port = htons(snum);
417         if ((ret = sctp_get_port_local(sk, addr))) {
418                 return -EADDRINUSE;
419         }
420 
421         /* Refresh ephemeral port.  */
422         if (!bp->port)
423                 bp->port = inet_sk(sk)->inet_num;
424 
425         /* Add the address to the bind address list.
426          * Use GFP_ATOMIC since BHs will be disabled.
427          */
428         ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
429                                  SCTP_ADDR_SRC, GFP_ATOMIC);
430 
431         /* Copy back into socket for getsockname() use. */
432         if (!ret) {
433                 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
434                 sp->pf->to_sk_saddr(addr, sk);
435         }
436 
437         return ret;
438 }
439 
440  /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
441  *
442  * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
443  * at any one time.  If a sender, after sending an ASCONF chunk, decides
444  * it needs to transfer another ASCONF Chunk, it MUST wait until the
445  * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
446  * subsequent ASCONF. Note this restriction binds each side, so at any
447  * time two ASCONF may be in-transit on any given association (one sent
448  * from each endpoint).
449  */
450 static int sctp_send_asconf(struct sctp_association *asoc,
451                             struct sctp_chunk *chunk)
452 {
453         struct net      *net = sock_net(asoc->base.sk);
454         int             retval = 0;
455 
456         /* If there is an outstanding ASCONF chunk, queue it for later
457          * transmission.
458          */
459         if (asoc->addip_last_asconf) {
460                 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
461                 goto out;
462         }
463 
464         /* Hold the chunk until an ASCONF_ACK is received. */
465         sctp_chunk_hold(chunk);
466         retval = sctp_primitive_ASCONF(net, asoc, chunk);
467         if (retval)
468                 sctp_chunk_free(chunk);
469         else
470                 asoc->addip_last_asconf = chunk;
471 
472 out:
473         return retval;
474 }
475 
476 /* Add a list of addresses as bind addresses to local endpoint or
477  * association.
478  *
479  * Basically run through each address specified in the addrs/addrcnt
480  * array/length pair, determine if it is IPv6 or IPv4 and call
481  * sctp_do_bind() on it.
482  *
483  * If any of them fails, then the operation will be reversed and the
484  * ones that were added will be removed.
485  *
486  * Only sctp_setsockopt_bindx() is supposed to call this function.
487  */
488 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
489 {
490         int cnt;
491         int retval = 0;
492         void *addr_buf;
493         struct sockaddr *sa_addr;
494         struct sctp_af *af;
495 
496         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
497                  addrs, addrcnt);
498 
499         addr_buf = addrs;
500         for (cnt = 0; cnt < addrcnt; cnt++) {
501                 /* The list may contain either IPv4 or IPv6 address;
502                  * determine the address length for walking thru the list.
503                  */
504                 sa_addr = addr_buf;
505                 af = sctp_get_af_specific(sa_addr->sa_family);
506                 if (!af) {
507                         retval = -EINVAL;
508                         goto err_bindx_add;
509                 }
510 
511                 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
512                                       af->sockaddr_len);
513 
514                 addr_buf += af->sockaddr_len;
515 
516 err_bindx_add:
517                 if (retval < 0) {
518                         /* Failed. Cleanup the ones that have been added */
519                         if (cnt > 0)
520                                 sctp_bindx_rem(sk, addrs, cnt);
521                         return retval;
522                 }
523         }
524 
525         return retval;
526 }
527 
528 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
529  * associations that are part of the endpoint indicating that a list of local
530  * addresses are added to the endpoint.
531  *
532  * If any of the addresses is already in the bind address list of the
533  * association, we do not send the chunk for that association.  But it will not
534  * affect other associations.
535  *
536  * Only sctp_setsockopt_bindx() is supposed to call this function.
537  */
538 static int sctp_send_asconf_add_ip(struct sock          *sk,
539                                    struct sockaddr      *addrs,
540                                    int                  addrcnt)
541 {
542         struct net *net = sock_net(sk);
543         struct sctp_sock                *sp;
544         struct sctp_endpoint            *ep;
545         struct sctp_association         *asoc;
546         struct sctp_bind_addr           *bp;
547         struct sctp_chunk               *chunk;
548         struct sctp_sockaddr_entry      *laddr;
549         union sctp_addr                 *addr;
550         union sctp_addr                 saveaddr;
551         void                            *addr_buf;
552         struct sctp_af                  *af;
553         struct list_head                *p;
554         int                             i;
555         int                             retval = 0;
556 
557         if (!net->sctp.addip_enable)
558                 return retval;
559 
560         sp = sctp_sk(sk);
561         ep = sp->ep;
562 
563         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
564                  __func__, sk, addrs, addrcnt);
565 
566         list_for_each_entry(asoc, &ep->asocs, asocs) {
567                 if (!asoc->peer.asconf_capable)
568                         continue;
569 
570                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
571                         continue;
572 
573                 if (!sctp_state(asoc, ESTABLISHED))
574                         continue;
575 
576                 /* Check if any address in the packed array of addresses is
577                  * in the bind address list of the association. If so,
578                  * do not send the asconf chunk to its peer, but continue with
579                  * other associations.
580                  */
581                 addr_buf = addrs;
582                 for (i = 0; i < addrcnt; i++) {
583                         addr = addr_buf;
584                         af = sctp_get_af_specific(addr->v4.sin_family);
585                         if (!af) {
586                                 retval = -EINVAL;
587                                 goto out;
588                         }
589 
590                         if (sctp_assoc_lookup_laddr(asoc, addr))
591                                 break;
592 
593                         addr_buf += af->sockaddr_len;
594                 }
595                 if (i < addrcnt)
596                         continue;
597 
598                 /* Use the first valid address in bind addr list of
599                  * association as Address Parameter of ASCONF CHUNK.
600                  */
601                 bp = &asoc->base.bind_addr;
602                 p = bp->address_list.next;
603                 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
604                 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
605                                                    addrcnt, SCTP_PARAM_ADD_IP);
606                 if (!chunk) {
607                         retval = -ENOMEM;
608                         goto out;
609                 }
610 
611                 /* Add the new addresses to the bind address list with
612                  * use_as_src set to 0.
613                  */
614                 addr_buf = addrs;
615                 for (i = 0; i < addrcnt; i++) {
616                         addr = addr_buf;
617                         af = sctp_get_af_specific(addr->v4.sin_family);
618                         memcpy(&saveaddr, addr, af->sockaddr_len);
619                         retval = sctp_add_bind_addr(bp, &saveaddr,
620                                                     sizeof(saveaddr),
621                                                     SCTP_ADDR_NEW, GFP_ATOMIC);
622                         addr_buf += af->sockaddr_len;
623                 }
624                 if (asoc->src_out_of_asoc_ok) {
625                         struct sctp_transport *trans;
626 
627                         list_for_each_entry(trans,
628                             &asoc->peer.transport_addr_list, transports) {
629                                 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
630                                     2*asoc->pathmtu, 4380));
631                                 trans->ssthresh = asoc->peer.i.a_rwnd;
632                                 trans->rto = asoc->rto_initial;
633                                 sctp_max_rto(asoc, trans);
634                                 trans->rtt = trans->srtt = trans->rttvar = 0;
635                                 /* Clear the source and route cache */
636                                 sctp_transport_route(trans, NULL,
637                                                      sctp_sk(asoc->base.sk));
638                         }
639                 }
640                 retval = sctp_send_asconf(asoc, chunk);
641         }
642 
643 out:
644         return retval;
645 }
646 
647 /* Remove a list of addresses from bind addresses list.  Do not remove the
648  * last address.
649  *
650  * Basically run through each address specified in the addrs/addrcnt
651  * array/length pair, determine if it is IPv6 or IPv4 and call
652  * sctp_del_bind() on it.
653  *
654  * If any of them fails, then the operation will be reversed and the
655  * ones that were removed will be added back.
656  *
657  * At least one address has to be left; if only one address is
658  * available, the operation will return -EBUSY.
659  *
660  * Only sctp_setsockopt_bindx() is supposed to call this function.
661  */
662 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
663 {
664         struct sctp_sock *sp = sctp_sk(sk);
665         struct sctp_endpoint *ep = sp->ep;
666         int cnt;
667         struct sctp_bind_addr *bp = &ep->base.bind_addr;
668         int retval = 0;
669         void *addr_buf;
670         union sctp_addr *sa_addr;
671         struct sctp_af *af;
672 
673         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
674                  __func__, sk, addrs, addrcnt);
675 
676         addr_buf = addrs;
677         for (cnt = 0; cnt < addrcnt; cnt++) {
678                 /* If the bind address list is empty or if there is only one
679                  * bind address, there is nothing more to be removed (we need
680                  * at least one address here).
681                  */
682                 if (list_empty(&bp->address_list) ||
683                     (sctp_list_single_entry(&bp->address_list))) {
684                         retval = -EBUSY;
685                         goto err_bindx_rem;
686                 }
687 
688                 sa_addr = addr_buf;
689                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
690                 if (!af) {
691                         retval = -EINVAL;
692                         goto err_bindx_rem;
693                 }
694 
695                 if (!af->addr_valid(sa_addr, sp, NULL)) {
696                         retval = -EADDRNOTAVAIL;
697                         goto err_bindx_rem;
698                 }
699 
700                 if (sa_addr->v4.sin_port &&
701                     sa_addr->v4.sin_port != htons(bp->port)) {
702                         retval = -EINVAL;
703                         goto err_bindx_rem;
704                 }
705 
706                 if (!sa_addr->v4.sin_port)
707                         sa_addr->v4.sin_port = htons(bp->port);
708 
709                 /* FIXME - There is probably a need to check if sk->sk_saddr and
710                  * sk->sk_rcv_addr are currently set to one of the addresses to
711                  * be removed. This is something which needs to be looked into
712                  * when we are fixing the outstanding issues with multi-homing
713                  * socket routing and failover schemes. Refer to comments in
714                  * sctp_do_bind(). -daisy
715                  */
716                 retval = sctp_del_bind_addr(bp, sa_addr);
717 
718                 addr_buf += af->sockaddr_len;
719 err_bindx_rem:
720                 if (retval < 0) {
721                         /* Failed. Add the ones that has been removed back */
722                         if (cnt > 0)
723                                 sctp_bindx_add(sk, addrs, cnt);
724                         return retval;
725                 }
726         }
727 
728         return retval;
729 }
730 
731 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
732  * the associations that are part of the endpoint indicating that a list of
733  * local addresses are removed from the endpoint.
734  *
735  * If any of the addresses is already in the bind address list of the
736  * association, we do not send the chunk for that association.  But it will not
737  * affect other associations.
738  *
739  * Only sctp_setsockopt_bindx() is supposed to call this function.
740  */
741 static int sctp_send_asconf_del_ip(struct sock          *sk,
742                                    struct sockaddr      *addrs,
743                                    int                  addrcnt)
744 {
745         struct net *net = sock_net(sk);
746         struct sctp_sock        *sp;
747         struct sctp_endpoint    *ep;
748         struct sctp_association *asoc;
749         struct sctp_transport   *transport;
750         struct sctp_bind_addr   *bp;
751         struct sctp_chunk       *chunk;
752         union sctp_addr         *laddr;
753         void                    *addr_buf;
754         struct sctp_af          *af;
755         struct sctp_sockaddr_entry *saddr;
756         int                     i;
757         int                     retval = 0;
758         int                     stored = 0;
759 
760         chunk = NULL;
761         if (!net->sctp.addip_enable)
762                 return retval;
763 
764         sp = sctp_sk(sk);
765         ep = sp->ep;
766 
767         pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
768                  __func__, sk, addrs, addrcnt);
769 
770         list_for_each_entry(asoc, &ep->asocs, asocs) {
771 
772                 if (!asoc->peer.asconf_capable)
773                         continue;
774 
775                 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
776                         continue;
777 
778                 if (!sctp_state(asoc, ESTABLISHED))
779                         continue;
780 
781                 /* Check if any address in the packed array of addresses is
782                  * not present in the bind address list of the association.
783                  * If so, do not send the asconf chunk to its peer, but
784                  * continue with other associations.
785                  */
786                 addr_buf = addrs;
787                 for (i = 0; i < addrcnt; i++) {
788                         laddr = addr_buf;
789                         af = sctp_get_af_specific(laddr->v4.sin_family);
790                         if (!af) {
791                                 retval = -EINVAL;
792                                 goto out;
793                         }
794 
795                         if (!sctp_assoc_lookup_laddr(asoc, laddr))
796                                 break;
797 
798                         addr_buf += af->sockaddr_len;
799                 }
800                 if (i < addrcnt)
801                         continue;
802 
803                 /* Find one address in the association's bind address list
804                  * that is not in the packed array of addresses. This is to
805                  * make sure that we do not delete all the addresses in the
806                  * association.
807                  */
808                 bp = &asoc->base.bind_addr;
809                 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
810                                                addrcnt, sp);
811                 if ((laddr == NULL) && (addrcnt == 1)) {
812                         if (asoc->asconf_addr_del_pending)
813                                 continue;
814                         asoc->asconf_addr_del_pending =
815                             kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
816                         if (asoc->asconf_addr_del_pending == NULL) {
817                                 retval = -ENOMEM;
818                                 goto out;
819                         }
820                         asoc->asconf_addr_del_pending->sa.sa_family =
821                                     addrs->sa_family;
822                         asoc->asconf_addr_del_pending->v4.sin_port =
823                                     htons(bp->port);
824                         if (addrs->sa_family == AF_INET) {
825                                 struct sockaddr_in *sin;
826 
827                                 sin = (struct sockaddr_in *)addrs;
828                                 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
829                         } else if (addrs->sa_family == AF_INET6) {
830                                 struct sockaddr_in6 *sin6;
831 
832                                 sin6 = (struct sockaddr_in6 *)addrs;
833                                 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
834                         }
835 
836                         pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
837                                  __func__, asoc, &asoc->asconf_addr_del_pending->sa,
838                                  asoc->asconf_addr_del_pending);
839 
840                         asoc->src_out_of_asoc_ok = 1;
841                         stored = 1;
842                         goto skip_mkasconf;
843                 }
844 
845                 if (laddr == NULL)
846                         return -EINVAL;
847 
848                 /* We do not need RCU protection throughout this loop
849                  * because this is done under a socket lock from the
850                  * setsockopt call.
851                  */
852                 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
853                                                    SCTP_PARAM_DEL_IP);
854                 if (!chunk) {
855                         retval = -ENOMEM;
856                         goto out;
857                 }
858 
859 skip_mkasconf:
860                 /* Reset use_as_src flag for the addresses in the bind address
861                  * list that are to be deleted.
862                  */
863                 addr_buf = addrs;
864                 for (i = 0; i < addrcnt; i++) {
865                         laddr = addr_buf;
866                         af = sctp_get_af_specific(laddr->v4.sin_family);
867                         list_for_each_entry(saddr, &bp->address_list, list) {
868                                 if (sctp_cmp_addr_exact(&saddr->a, laddr))
869                                         saddr->state = SCTP_ADDR_DEL;
870                         }
871                         addr_buf += af->sockaddr_len;
872                 }
873 
874                 /* Update the route and saddr entries for all the transports
875                  * as some of the addresses in the bind address list are
876                  * about to be deleted and cannot be used as source addresses.
877                  */
878                 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
879                                         transports) {
880                         sctp_transport_route(transport, NULL,
881                                              sctp_sk(asoc->base.sk));
882                 }
883 
884                 if (stored)
885                         /* We don't need to transmit ASCONF */
886                         continue;
887                 retval = sctp_send_asconf(asoc, chunk);
888         }
889 out:
890         return retval;
891 }
892 
893 /* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
894 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
895 {
896         struct sock *sk = sctp_opt2sk(sp);
897         union sctp_addr *addr;
898         struct sctp_af *af;
899 
900         /* It is safe to write port space in caller. */
901         addr = &addrw->a;
902         addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
903         af = sctp_get_af_specific(addr->sa.sa_family);
904         if (!af)
905                 return -EINVAL;
906         if (sctp_verify_addr(sk, addr, af->sockaddr_len))
907                 return -EINVAL;
908 
909         if (addrw->state == SCTP_ADDR_NEW)
910                 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
911         else
912                 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
913 }
914 
915 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
916  *
917  * API 8.1
918  * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
919  *                int flags);
920  *
921  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
922  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
923  * or IPv6 addresses.
924  *
925  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
926  * Section 3.1.2 for this usage.
927  *
928  * addrs is a pointer to an array of one or more socket addresses. Each
929  * address is contained in its appropriate structure (i.e. struct
930  * sockaddr_in or struct sockaddr_in6) the family of the address type
931  * must be used to distinguish the address length (note that this
932  * representation is termed a "packed array" of addresses). The caller
933  * specifies the number of addresses in the array with addrcnt.
934  *
935  * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
936  * -1, and sets errno to the appropriate error code.
937  *
938  * For SCTP, the port given in each socket address must be the same, or
939  * sctp_bindx() will fail, setting errno to EINVAL.
940  *
941  * The flags parameter is formed from the bitwise OR of zero or more of
942  * the following currently defined flags:
943  *
944  * SCTP_BINDX_ADD_ADDR
945  *
946  * SCTP_BINDX_REM_ADDR
947  *
948  * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
949  * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
950  * addresses from the association. The two flags are mutually exclusive;
951  * if both are given, sctp_bindx() will fail with EINVAL. A caller may
952  * not remove all addresses from an association; sctp_bindx() will
953  * reject such an attempt with EINVAL.
954  *
955  * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
956  * additional addresses with an endpoint after calling bind().  Or use
957  * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
958  * socket is associated with so that no new association accepted will be
959  * associated with those addresses. If the endpoint supports dynamic
960  * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
961  * endpoint to send the appropriate message to the peer to change the
962  * peers address lists.
963  *
964  * Adding and removing addresses from a connected association is
965  * optional functionality. Implementations that do not support this
966  * functionality should return EOPNOTSUPP.
967  *
968  * Basically do nothing but copying the addresses from user to kernel
969  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
970  * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
971  * from userspace.
972  *
973  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
974  * it.
975  *
976  * sk        The sk of the socket
977  * addrs     The pointer to the addresses in user land
978  * addrssize Size of the addrs buffer
979  * op        Operation to perform (add or remove, see the flags of
980  *           sctp_bindx)
981  *
982  * Returns 0 if ok, <0 errno code on error.
983  */
984 static int sctp_setsockopt_bindx(struct sock *sk,
985                                  struct sockaddr __user *addrs,
986                                  int addrs_size, int op)
987 {
988         struct sockaddr *kaddrs;
989         int err;
990         int addrcnt = 0;
991         int walk_size = 0;
992         struct sockaddr *sa_addr;
993         void *addr_buf;
994         struct sctp_af *af;
995 
996         pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
997                  __func__, sk, addrs, addrs_size, op);
998 
999         if (unlikely(addrs_size <= 0))
1000                 return -EINVAL;
1001 
1002         kaddrs = vmemdup_user(addrs, addrs_size);
1003         if (unlikely(IS_ERR(kaddrs)))
1004                 return PTR_ERR(kaddrs);
1005 
1006         /* Walk through the addrs buffer and count the number of addresses. */
1007         addr_buf = kaddrs;
1008         while (walk_size < addrs_size) {
1009                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1010                         kvfree(kaddrs);
1011                         return -EINVAL;
1012                 }
1013 
1014                 sa_addr = addr_buf;
1015                 af = sctp_get_af_specific(sa_addr->sa_family);
1016 
1017                 /* If the address family is not supported or if this address
1018                  * causes the address buffer to overflow return EINVAL.
1019                  */
1020                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1021                         kvfree(kaddrs);
1022                         return -EINVAL;
1023                 }
1024                 addrcnt++;
1025                 addr_buf += af->sockaddr_len;
1026                 walk_size += af->sockaddr_len;
1027         }
1028 
1029         /* Do the work. */
1030         switch (op) {
1031         case SCTP_BINDX_ADD_ADDR:
1032                 /* Allow security module to validate bindx addresses. */
1033                 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1034                                                  (struct sockaddr *)kaddrs,
1035                                                  addrs_size);
1036                 if (err)
1037                         goto out;
1038                 err = sctp_bindx_add(sk, kaddrs, addrcnt);
1039                 if (err)
1040                         goto out;
1041                 err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1042                 break;
1043 
1044         case SCTP_BINDX_REM_ADDR:
1045                 err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1046                 if (err)
1047                         goto out;
1048                 err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1049                 break;
1050 
1051         default:
1052                 err = -EINVAL;
1053                 break;
1054         }
1055 
1056 out:
1057         kvfree(kaddrs);
1058 
1059         return err;
1060 }
1061 
1062 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1063  *
1064  * Common routine for handling connect() and sctp_connectx().
1065  * Connect will come in with just a single address.
1066  */
1067 static int __sctp_connect(struct sock *sk,
1068                           struct sockaddr *kaddrs,
1069                           int addrs_size, int flags,
1070                           sctp_assoc_t *assoc_id)
1071 {
1072         struct net *net = sock_net(sk);
1073         struct sctp_sock *sp;
1074         struct sctp_endpoint *ep;
1075         struct sctp_association *asoc = NULL;
1076         struct sctp_association *asoc2;
1077         struct sctp_transport *transport;
1078         union sctp_addr to;
1079         enum sctp_scope scope;
1080         long timeo;
1081         int err = 0;
1082         int addrcnt = 0;
1083         int walk_size = 0;
1084         union sctp_addr *sa_addr = NULL;
1085         void *addr_buf;
1086         unsigned short port;
1087 
1088         sp = sctp_sk(sk);
1089         ep = sp->ep;
1090 
1091         /* connect() cannot be done on a socket that is already in ESTABLISHED
1092          * state - UDP-style peeled off socket or a TCP-style socket that
1093          * is already connected.
1094          * It cannot be done even on a TCP-style listening socket.
1095          */
1096         if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1097             (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1098                 err = -EISCONN;
1099                 goto out_free;
1100         }
1101 
1102         /* Walk through the addrs buffer and count the number of addresses. */
1103         addr_buf = kaddrs;
1104         while (walk_size < addrs_size) {
1105                 struct sctp_af *af;
1106 
1107                 if (walk_size + sizeof(sa_family_t) > addrs_size) {
1108                         err = -EINVAL;
1109                         goto out_free;
1110                 }
1111 
1112                 sa_addr = addr_buf;
1113                 af = sctp_get_af_specific(sa_addr->sa.sa_family);
1114 
1115                 /* If the address family is not supported or if this address
1116                  * causes the address buffer to overflow return EINVAL.
1117                  */
1118                 if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1119                         err = -EINVAL;
1120                         goto out_free;
1121                 }
1122 
1123                 port = ntohs(sa_addr->v4.sin_port);
1124 
1125                 /* Save current address so we can work with it */
1126                 memcpy(&to, sa_addr, af->sockaddr_len);
1127 
1128                 err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1129                 if (err)
1130                         goto out_free;
1131 
1132                 /* Make sure the destination port is correctly set
1133                  * in all addresses.
1134                  */
1135                 if (asoc && asoc->peer.port && asoc->peer.port != port) {
1136                         err = -EINVAL;
1137                         goto out_free;
1138                 }
1139 
1140                 /* Check if there already is a matching association on the
1141                  * endpoint (other than the one created here).
1142                  */
1143                 asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1144                 if (asoc2 && asoc2 != asoc) {
1145                         if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1146                                 err = -EISCONN;
1147                         else
1148                                 err = -EALREADY;
1149                         goto out_free;
1150                 }
1151 
1152                 /* If we could not find a matching association on the endpoint,
1153                  * make sure that there is no peeled-off association matching
1154                  * the peer address even on another socket.
1155                  */
1156                 if (sctp_endpoint_is_peeled_off(ep, &to)) {
1157                         err = -EADDRNOTAVAIL;
1158                         goto out_free;
1159                 }
1160 
1161                 if (!asoc) {
1162                         /* If a bind() or sctp_bindx() is not called prior to
1163                          * an sctp_connectx() call, the system picks an
1164                          * ephemeral port and will choose an address set
1165                          * equivalent to binding with a wildcard address.
1166                          */
1167                         if (!ep->base.bind_addr.port) {
1168                                 if (sctp_autobind(sk)) {
1169                                         err = -EAGAIN;
1170                                         goto out_free;
1171                                 }
1172                         } else {
1173                                 /*
1174                                  * If an unprivileged user inherits a 1-many
1175                                  * style socket with open associations on a
1176                                  * privileged port, it MAY be permitted to
1177                                  * accept new associations, but it SHOULD NOT
1178                                  * be permitted to open new associations.
1179                                  */
1180                                 if (ep->base.bind_addr.port <
1181                                     inet_prot_sock(net) &&
1182                                     !ns_capable(net->user_ns,
1183                                     CAP_NET_BIND_SERVICE)) {
1184                                         err = -EACCES;
1185                                         goto out_free;
1186                                 }
1187                         }
1188 
1189                         scope = sctp_scope(&to);
1190                         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1191                         if (!asoc) {
1192                                 err = -ENOMEM;
1193                                 goto out_free;
1194                         }
1195 
1196                         err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1197                                                               GFP_KERNEL);
1198                         if (err < 0) {
1199                                 goto out_free;
1200                         }
1201 
1202                 }
1203 
1204                 /* Prime the peer's transport structures.  */
1205                 transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1206                                                 SCTP_UNKNOWN);
1207                 if (!transport) {
1208                         err = -ENOMEM;
1209                         goto out_free;
1210                 }
1211 
1212                 addrcnt++;
1213                 addr_buf += af->sockaddr_len;
1214                 walk_size += af->sockaddr_len;
1215         }
1216 
1217         /* In case the user of sctp_connectx() wants an association
1218          * id back, assign one now.
1219          */
1220         if (assoc_id) {
1221                 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1222                 if (err < 0)
1223                         goto out_free;
1224         }
1225 
1226         err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1227         if (err < 0) {
1228                 goto out_free;
1229         }
1230 
1231         /* Initialize sk's dport and daddr for getpeername() */
1232         inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1233         sp->pf->to_sk_daddr(sa_addr, sk);
1234         sk->sk_err = 0;
1235 
1236         timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1237 
1238         if (assoc_id)
1239                 *assoc_id = asoc->assoc_id;
1240 
1241         err = sctp_wait_for_connect(asoc, &timeo);
1242         /* Note: the asoc may be freed after the return of
1243          * sctp_wait_for_connect.
1244          */
1245 
1246         /* Don't free association on exit. */
1247         asoc = NULL;
1248 
1249 out_free:
1250         pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1251                  __func__, asoc, kaddrs, err);
1252 
1253         if (asoc) {
1254                 /* sctp_primitive_ASSOCIATE may have added this association
1255                  * To the hash table, try to unhash it, just in case, its a noop
1256                  * if it wasn't hashed so we're safe
1257                  */
1258                 sctp_association_free(asoc);
1259         }
1260         return err;
1261 }
1262 
1263 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1264  *
1265  * API 8.9
1266  * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1267  *                      sctp_assoc_t *asoc);
1268  *
1269  * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1270  * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1271  * or IPv6 addresses.
1272  *
1273  * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1274  * Section 3.1.2 for this usage.
1275  *
1276  * addrs is a pointer to an array of one or more socket addresses. Each
1277  * address is contained in its appropriate structure (i.e. struct
1278  * sockaddr_in or struct sockaddr_in6) the family of the address type
1279  * must be used to distengish the address length (note that this
1280  * representation is termed a "packed array" of addresses). The caller
1281  * specifies the number of addresses in the array with addrcnt.
1282  *
1283  * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1284  * the association id of the new association.  On failure, sctp_connectx()
1285  * returns -1, and sets errno to the appropriate error code.  The assoc_id
1286  * is not touched by the kernel.
1287  *
1288  * For SCTP, the port given in each socket address must be the same, or
1289  * sctp_connectx() will fail, setting errno to EINVAL.
1290  *
1291  * An application can use sctp_connectx to initiate an association with
1292  * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1293  * allows a caller to specify multiple addresses at which a peer can be
1294  * reached.  The way the SCTP stack uses the list of addresses to set up
1295  * the association is implementation dependent.  This function only
1296  * specifies that the stack will try to make use of all the addresses in
1297  * the list when needed.
1298  *
1299  * Note that the list of addresses passed in is only used for setting up
1300  * the association.  It does not necessarily equal the set of addresses
1301  * the peer uses for the resulting association.  If the caller wants to
1302  * find out the set of peer addresses, it must use sctp_getpaddrs() to
1303  * retrieve them after the association has been set up.
1304  *
1305  * Basically do nothing but copying the addresses from user to kernel
1306  * land and invoking either sctp_connectx(). This is used for tunneling
1307  * the sctp_connectx() request through sctp_setsockopt() from userspace.
1308  *
1309  * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1310  * it.
1311  *
1312  * sk        The sk of the socket
1313  * addrs     The pointer to the addresses in user land
1314  * addrssize Size of the addrs buffer
1315  *
1316  * Returns >=0 if ok, <0 errno code on error.
1317  */
1318 static int __sctp_setsockopt_connectx(struct sock *sk,
1319                                       struct sockaddr __user *addrs,
1320                                       int addrs_size,
1321                                       sctp_assoc_t *assoc_id)
1322 {
1323         struct sockaddr *kaddrs;
1324         int err = 0, flags = 0;
1325 
1326         pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1327                  __func__, sk, addrs, addrs_size);
1328 
1329         if (unlikely(addrs_size <= 0))
1330                 return -EINVAL;
1331 
1332         kaddrs = vmemdup_user(addrs, addrs_size);
1333         if (unlikely(IS_ERR(kaddrs)))
1334                 return PTR_ERR(kaddrs);
1335 
1336         /* Allow security module to validate connectx addresses. */
1337         err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1338                                          (struct sockaddr *)kaddrs,
1339                                           addrs_size);
1340         if (err)
1341                 goto out_free;
1342 
1343         /* in-kernel sockets don't generally have a file allocated to them
1344          * if all they do is call sock_create_kern().
1345          */
1346         if (sk->sk_socket->file)
1347                 flags = sk->sk_socket->file->f_flags;
1348 
1349         err = __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1350 
1351 out_free:
1352         kvfree(kaddrs);
1353 
1354         return err;
1355 }
1356 
1357 /*
1358  * This is an older interface.  It's kept for backward compatibility
1359  * to the option that doesn't provide association id.
1360  */
1361 static int sctp_setsockopt_connectx_old(struct sock *sk,
1362                                         struct sockaddr __user *addrs,
1363                                         int addrs_size)
1364 {
1365         return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1366 }
1367 
1368 /*
1369  * New interface for the API.  The since the API is done with a socket
1370  * option, to make it simple we feed back the association id is as a return
1371  * indication to the call.  Error is always negative and association id is
1372  * always positive.
1373  */
1374 static int sctp_setsockopt_connectx(struct sock *sk,
1375                                     struct sockaddr __user *addrs,
1376                                     int addrs_size)
1377 {
1378         sctp_assoc_t assoc_id = 0;
1379         int err = 0;
1380 
1381         err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1382 
1383         if (err)
1384                 return err;
1385         else
1386                 return assoc_id;
1387 }
1388 
1389 /*
1390  * New (hopefully final) interface for the API.
1391  * We use the sctp_getaddrs_old structure so that use-space library
1392  * can avoid any unnecessary allocations. The only different part
1393  * is that we store the actual length of the address buffer into the
1394  * addrs_num structure member. That way we can re-use the existing
1395  * code.
1396  */
1397 #ifdef CONFIG_COMPAT
1398 struct compat_sctp_getaddrs_old {
1399         sctp_assoc_t    assoc_id;
1400         s32             addr_num;
1401         compat_uptr_t   addrs;          /* struct sockaddr * */
1402 };
1403 #endif
1404 
1405 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1406                                      char __user *optval,
1407                                      int __user *optlen)
1408 {
1409         struct sctp_getaddrs_old param;
1410         sctp_assoc_t assoc_id = 0;
1411         int err = 0;
1412 
1413 #ifdef CONFIG_COMPAT
1414         if (in_compat_syscall()) {
1415                 struct compat_sctp_getaddrs_old param32;
1416 
1417                 if (len < sizeof(param32))
1418                         return -EINVAL;
1419                 if (copy_from_user(&param32, optval, sizeof(param32)))
1420                         return -EFAULT;
1421 
1422                 param.assoc_id = param32.assoc_id;
1423                 param.addr_num = param32.addr_num;
1424                 param.addrs = compat_ptr(param32.addrs);
1425         } else
1426 #endif
1427         {
1428                 if (len < sizeof(param))
1429                         return -EINVAL;
1430                 if (copy_from_user(&param, optval, sizeof(param)))
1431                         return -EFAULT;
1432         }
1433 
1434         err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
1435                                          param.addrs, param.addr_num,
1436                                          &assoc_id);
1437         if (err == 0 || err == -EINPROGRESS) {
1438                 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1439                         return -EFAULT;
1440                 if (put_user(sizeof(assoc_id), optlen))
1441                         return -EFAULT;
1442         }
1443 
1444         return err;
1445 }
1446 
1447 /* API 3.1.4 close() - UDP Style Syntax
1448  * Applications use close() to perform graceful shutdown (as described in
1449  * Section 10.1 of [SCTP]) on ALL the associations currently represented
1450  * by a UDP-style socket.
1451  *
1452  * The syntax is
1453  *
1454  *   ret = close(int sd);
1455  *
1456  *   sd      - the socket descriptor of the associations to be closed.
1457  *
1458  * To gracefully shutdown a specific association represented by the
1459  * UDP-style socket, an application should use the sendmsg() call,
1460  * passing no user data, but including the appropriate flag in the
1461  * ancillary data (see Section xxxx).
1462  *
1463  * If sd in the close() call is a branched-off socket representing only
1464  * one association, the shutdown is performed on that association only.
1465  *
1466  * 4.1.6 close() - TCP Style Syntax
1467  *
1468  * Applications use close() to gracefully close down an association.
1469  *
1470  * The syntax is:
1471  *
1472  *    int close(int sd);
1473  *
1474  *      sd      - the socket descriptor of the association to be closed.
1475  *
1476  * After an application calls close() on a socket descriptor, no further
1477  * socket operations will succeed on that descriptor.
1478  *
1479  * API 7.1.4 SO_LINGER
1480  *
1481  * An application using the TCP-style socket can use this option to
1482  * perform the SCTP ABORT primitive.  The linger option structure is:
1483  *
1484  *  struct  linger {
1485  *     int     l_onoff;                // option on/off
1486  *     int     l_linger;               // linger time
1487  * };
1488  *
1489  * To enable the option, set l_onoff to 1.  If the l_linger value is set
1490  * to 0, calling close() is the same as the ABORT primitive.  If the
1491  * value is set to a negative value, the setsockopt() call will return
1492  * an error.  If the value is set to a positive value linger_time, the
1493  * close() can be blocked for at most linger_time ms.  If the graceful
1494  * shutdown phase does not finish during this period, close() will
1495  * return but the graceful shutdown phase continues in the system.
1496  */
1497 static void sctp_close(struct sock *sk, long timeout)
1498 {
1499         struct net *net = sock_net(sk);
1500         struct sctp_endpoint *ep;
1501         struct sctp_association *asoc;
1502         struct list_head *pos, *temp;
1503         unsigned int data_was_unread;
1504 
1505         pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1506 
1507         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1508         sk->sk_shutdown = SHUTDOWN_MASK;
1509         inet_sk_set_state(sk, SCTP_SS_CLOSING);
1510 
1511         ep = sctp_sk(sk)->ep;
1512 
1513         /* Clean up any skbs sitting on the receive queue.  */
1514         data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1515         data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1516 
1517         /* Walk all associations on an endpoint.  */
1518         list_for_each_safe(pos, temp, &ep->asocs) {
1519                 asoc = list_entry(pos, struct sctp_association, asocs);
1520 
1521                 if (sctp_style(sk, TCP)) {
1522                         /* A closed association can still be in the list if
1523                          * it belongs to a TCP-style listening socket that is
1524                          * not yet accepted. If so, free it. If not, send an
1525                          * ABORT or SHUTDOWN based on the linger options.
1526                          */
1527                         if (sctp_state(asoc, CLOSED)) {
1528                                 sctp_association_free(asoc);
1529                                 continue;
1530                         }
1531                 }
1532 
1533                 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1534                     !skb_queue_empty(&asoc->ulpq.reasm) ||
1535                     !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1536                     (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1537                         struct sctp_chunk *chunk;
1538 
1539                         chunk = sctp_make_abort_user(asoc, NULL, 0);
1540                         sctp_primitive_ABORT(net, asoc, chunk);
1541                 } else
1542                         sctp_primitive_SHUTDOWN(net, asoc, NULL);
1543         }
1544 
1545         /* On a TCP-style socket, block for at most linger_time if set. */
1546         if (sctp_style(sk, TCP) && timeout)
1547                 sctp_wait_for_close(sk, timeout);
1548 
1549         /* This will run the backlog queue.  */
1550         release_sock(sk);
1551 
1552         /* Supposedly, no process has access to the socket, but
1553          * the net layers still may.
1554          * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1555          * held and that should be grabbed before socket lock.
1556          */
1557         spin_lock_bh(&net->sctp.addr_wq_lock);
1558         bh_lock_sock_nested(sk);
1559 
1560         /* Hold the sock, since sk_common_release() will put sock_put()
1561          * and we have just a little more cleanup.
1562          */
1563         sock_hold(sk);
1564         sk_common_release(sk);
1565 
1566         bh_unlock_sock(sk);
1567         spin_unlock_bh(&net->sctp.addr_wq_lock);
1568 
1569         sock_put(sk);
1570 
1571         SCTP_DBG_OBJCNT_DEC(sock);
1572 }
1573 
1574 /* Handle EPIPE error. */
1575 static int sctp_error(struct sock *sk, int flags, int err)
1576 {
1577         if (err == -EPIPE)
1578                 err = sock_error(sk) ? : -EPIPE;
1579         if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1580                 send_sig(SIGPIPE, current, 0);
1581         return err;
1582 }
1583 
1584 /* API 3.1.3 sendmsg() - UDP Style Syntax
1585  *
1586  * An application uses sendmsg() and recvmsg() calls to transmit data to
1587  * and receive data from its peer.
1588  *
1589  *  ssize_t sendmsg(int socket, const struct msghdr *message,
1590  *                  int flags);
1591  *
1592  *  socket  - the socket descriptor of the endpoint.
1593  *  message - pointer to the msghdr structure which contains a single
1594  *            user message and possibly some ancillary data.
1595  *
1596  *            See Section 5 for complete description of the data
1597  *            structures.
1598  *
1599  *  flags   - flags sent or received with the user message, see Section
1600  *            5 for complete description of the flags.
1601  *
1602  * Note:  This function could use a rewrite especially when explicit
1603  * connect support comes in.
1604  */
1605 /* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1606 
1607 static int sctp_msghdr_parse(const struct msghdr *msg,
1608                              struct sctp_cmsgs *cmsgs);
1609 
1610 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1611                               struct sctp_sndrcvinfo *srinfo,
1612                               const struct msghdr *msg, size_t msg_len)
1613 {
1614         __u16 sflags;
1615         int err;
1616 
1617         if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1618                 return -EPIPE;
1619 
1620         if (msg_len > sk->sk_sndbuf)
1621                 return -EMSGSIZE;
1622 
1623         memset(cmsgs, 0, sizeof(*cmsgs));
1624         err = sctp_msghdr_parse(msg, cmsgs);
1625         if (err) {
1626                 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1627                 return err;
1628         }
1629 
1630         memset(srinfo, 0, sizeof(*srinfo));
1631         if (cmsgs->srinfo) {
1632                 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1633                 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1634                 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1635                 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1636                 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1637                 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1638         }
1639 
1640         if (cmsgs->sinfo) {
1641                 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1642                 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1643                 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1644                 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1645                 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1646         }
1647 
1648         if (cmsgs->prinfo) {
1649                 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1650                 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1651                                    cmsgs->prinfo->pr_policy);
1652         }
1653 
1654         sflags = srinfo->sinfo_flags;
1655         if (!sflags && msg_len)
1656                 return 0;
1657 
1658         if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1659                 return -EINVAL;
1660 
1661         if (((sflags & SCTP_EOF) && msg_len > 0) ||
1662             (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1663                 return -EINVAL;
1664 
1665         if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1666                 return -EINVAL;
1667 
1668         return 0;
1669 }
1670 
1671 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1672                                  struct sctp_cmsgs *cmsgs,
1673                                  union sctp_addr *daddr,
1674                                  struct sctp_transport **tp)
1675 {
1676         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1677         struct net *net = sock_net(sk);
1678         struct sctp_association *asoc;
1679         enum sctp_scope scope;
1680         struct cmsghdr *cmsg;
1681         __be32 flowinfo = 0;
1682         struct sctp_af *af;
1683         int err;
1684 
1685         *tp = NULL;
1686 
1687         if (sflags & (SCTP_EOF | SCTP_ABORT))
1688                 return -EINVAL;
1689 
1690         if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1691                                     sctp_sstate(sk, CLOSING)))
1692                 return -EADDRNOTAVAIL;
1693 
1694         if (sctp_endpoint_is_peeled_off(ep, daddr))
1695                 return -EADDRNOTAVAIL;
1696 
1697         if (!ep->base.bind_addr.port) {
1698                 if (sctp_autobind(sk))
1699                         return -EAGAIN;
1700         } else {
1701                 if (ep->base.bind_addr.port < inet_prot_sock(net) &&
1702                     !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1703                         return -EACCES;
1704         }
1705 
1706         scope = sctp_scope(daddr);
1707 
1708         /* Label connection socket for first association 1-to-many
1709          * style for client sequence socket()->sendmsg(). This
1710          * needs to be done before sctp_assoc_add_peer() as that will
1711          * set up the initial packet that needs to account for any
1712          * security ip options (CIPSO/CALIPSO) added to the packet.
1713          */
1714         af = sctp_get_af_specific(daddr->sa.sa_family);
1715         if (!af)
1716                 return -EINVAL;
1717         err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1718                                          (struct sockaddr *)daddr,
1719                                          af->sockaddr_len);
1720         if (err < 0)
1721                 return err;
1722 
1723         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1724         if (!asoc)
1725                 return -ENOMEM;
1726 
1727         if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
1728                 err = -ENOMEM;
1729                 goto free;
1730         }
1731 
1732         if (cmsgs->init) {
1733                 struct sctp_initmsg *init = cmsgs->init;
1734 
1735                 if (init->sinit_num_ostreams) {
1736                         __u16 outcnt = init->sinit_num_ostreams;
1737 
1738                         asoc->c.sinit_num_ostreams = outcnt;
1739                         /* outcnt has been changed, need to re-init stream */
1740                         err = sctp_stream_init(&asoc->stream, outcnt, 0,
1741                                                GFP_KERNEL);
1742                         if (err)
1743                                 goto free;
1744                 }
1745 
1746                 if (init->sinit_max_instreams)
1747                         asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1748 
1749                 if (init->sinit_max_attempts)
1750                         asoc->max_init_attempts = init->sinit_max_attempts;
1751 
1752                 if (init->sinit_max_init_timeo)
1753                         asoc->max_init_timeo =
1754                                 msecs_to_jiffies(init->sinit_max_init_timeo);
1755         }
1756 
1757         *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1758         if (!*tp) {
1759                 err = -ENOMEM;
1760                 goto free;
1761         }
1762 
1763         if (!cmsgs->addrs_msg)
1764                 return 0;
1765 
1766         if (daddr->sa.sa_family == AF_INET6)
1767                 flowinfo = daddr->v6.sin6_flowinfo;
1768 
1769         /* sendv addr list parse */
1770         for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1771                 struct sctp_transport *transport;
1772                 struct sctp_association *old;
1773                 union sctp_addr _daddr;
1774                 int dlen;
1775 
1776                 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1777                     (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1778                      cmsg->cmsg_type != SCTP_DSTADDRV6))
1779                         continue;
1780 
1781                 daddr = &_daddr;
1782                 memset(daddr, 0, sizeof(*daddr));
1783                 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1784                 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1785                         if (dlen < sizeof(struct in_addr)) {
1786                                 err = -EINVAL;
1787                                 goto free;
1788                         }
1789 
1790                         dlen = sizeof(struct in_addr);
1791                         daddr->v4.sin_family = AF_INET;
1792                         daddr->v4.sin_port = htons(asoc->peer.port);
1793                         memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1794                 } else {
1795                         if (dlen < sizeof(struct in6_addr)) {
1796                                 err = -EINVAL;
1797                                 goto free;
1798                         }
1799 
1800                         dlen = sizeof(struct in6_addr);
1801                         daddr->v6.sin6_flowinfo = flowinfo;
1802                         daddr->v6.sin6_family = AF_INET6;
1803                         daddr->v6.sin6_port = htons(asoc->peer.port);
1804                         memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1805                 }
1806                 err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
1807                 if (err)
1808                         goto free;
1809 
1810                 old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1811                 if (old && old != asoc) {
1812                         if (old->state >= SCTP_STATE_ESTABLISHED)
1813                                 err = -EISCONN;
1814                         else
1815                                 err = -EALREADY;
1816                         goto free;
1817                 }
1818 
1819                 if (sctp_endpoint_is_peeled_off(ep, daddr)) {
1820                         err = -EADDRNOTAVAIL;
1821                         goto free;
1822                 }
1823 
1824                 transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
1825                                                 SCTP_UNKNOWN);
1826                 if (!transport) {
1827                         err = -ENOMEM;
1828                         goto free;
1829                 }
1830         }
1831 
1832         return 0;
1833 
1834 free:
1835         sctp_association_free(asoc);
1836         return err;
1837 }
1838 
1839 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1840                                      __u16 sflags, struct msghdr *msg,
1841                                      size_t msg_len)
1842 {
1843         struct sock *sk = asoc->base.sk;
1844         struct net *net = sock_net(sk);
1845 
1846         if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1847                 return -EPIPE;
1848 
1849         if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1850             !sctp_state(asoc, ESTABLISHED))
1851                 return 0;
1852 
1853         if (sflags & SCTP_EOF) {
1854                 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1855                 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1856 
1857                 return 0;
1858         }
1859 
1860         if (sflags & SCTP_ABORT) {
1861                 struct sctp_chunk *chunk;
1862 
1863                 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1864                 if (!chunk)
1865                         return -ENOMEM;
1866 
1867                 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1868                 sctp_primitive_ABORT(net, asoc, chunk);
1869                 iov_iter_revert(&msg->msg_iter, msg_len);
1870 
1871                 return 0;
1872         }
1873 
1874         return 1;
1875 }
1876 
1877 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1878                                 struct msghdr *msg, size_t msg_len,
1879                                 struct sctp_transport *transport,
1880                                 struct sctp_sndrcvinfo *sinfo)
1881 {
1882         struct sock *sk = asoc->base.sk;
1883         struct sctp_sock *sp = sctp_sk(sk);
1884         struct net *net = sock_net(sk);
1885         struct sctp_datamsg *datamsg;
1886         bool wait_connect = false;
1887         struct sctp_chunk *chunk;
1888         long timeo;
1889         int err;
1890 
1891         if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1892                 err = -EINVAL;
1893                 goto err;
1894         }
1895 
1896         if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1897                 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1898                 if (err)
1899                         goto err;
1900         }
1901 
1902         if (sp->disable_fragments && msg_len > asoc->frag_point) {
1903                 err = -EMSGSIZE;
1904                 goto err;
1905         }
1906 
1907         if (asoc->pmtu_pending) {
1908                 if (sp->param_flags & SPP_PMTUD_ENABLE)
1909                         sctp_assoc_sync_pmtu(asoc);
1910                 asoc->pmtu_pending = 0;
1911         }
1912 
1913         if (sctp_wspace(asoc) < (int)msg_len)
1914                 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1915 
1916         if (sctp_wspace(asoc) <= 0) {
1917                 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1918                 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1919                 if (err)
1920                         goto err;
1921         }
1922 
1923         if (sctp_state(asoc, CLOSED)) {
1924                 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1925                 if (err)
1926                         goto err;
1927 
1928                 if (sp->strm_interleave) {
1929                         timeo = sock_sndtimeo(sk, 0);
1930                         err = sctp_wait_for_connect(asoc, &timeo);
1931                         if (err) {
1932                                 err = -ESRCH;
1933                                 goto err;
1934                         }
1935                 } else {
1936                         wait_connect = true;
1937                 }
1938 
1939                 pr_debug("%s: we associated primitively\n", __func__);
1940         }
1941 
1942         datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1943         if (IS_ERR(datamsg)) {
1944                 err = PTR_ERR(datamsg);
1945                 goto err;
1946         }
1947 
1948         asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1949 
1950         list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1951                 sctp_chunk_hold(chunk);
1952                 sctp_set_owner_w(chunk);
1953                 chunk->transport = transport;
1954         }
1955 
1956         err = sctp_primitive_SEND(net, asoc, datamsg);
1957         if (err) {
1958                 sctp_datamsg_free(datamsg);
1959                 goto err;
1960         }
1961 
1962         pr_debug("%s: we sent primitively\n", __func__);
1963 
1964         sctp_datamsg_put(datamsg);
1965 
1966         if (unlikely(wait_connect)) {
1967                 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1968                 sctp_wait_for_connect(asoc, &timeo);
1969         }
1970 
1971         err = msg_len;
1972 
1973 err:
1974         return err;
1975 }
1976 
1977 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1978                                                const struct msghdr *msg,
1979                                                struct sctp_cmsgs *cmsgs)
1980 {
1981         union sctp_addr *daddr = NULL;
1982         int err;
1983 
1984         if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1985                 int len = msg->msg_namelen;
1986 
1987                 if (len > sizeof(*daddr))
1988                         len = sizeof(*daddr);
1989 
1990                 daddr = (union sctp_addr *)msg->msg_name;
1991 
1992                 err = sctp_verify_addr(sk, daddr, len);
1993                 if (err)
1994                         return ERR_PTR(err);
1995         }
1996 
1997         return daddr;
1998 }
1999 
2000 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
2001                                       struct sctp_sndrcvinfo *sinfo,
2002                                       struct sctp_cmsgs *cmsgs)
2003 {
2004         if (!cmsgs->srinfo && !cmsgs->sinfo) {
2005                 sinfo->sinfo_stream = asoc->default_stream;
2006                 sinfo->sinfo_ppid = asoc->default_ppid;
2007                 sinfo->sinfo_context = asoc->default_context;
2008                 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
2009 
2010                 if (!cmsgs->prinfo)
2011                         sinfo->sinfo_flags = asoc->default_flags;
2012         }
2013 
2014         if (!cmsgs->srinfo && !cmsgs->prinfo)
2015                 sinfo->sinfo_timetolive = asoc->default_timetolive;
2016 
2017         if (cmsgs->authinfo) {
2018                 /* Reuse sinfo_tsn to indicate that authinfo was set and
2019                  * sinfo_ssn to save the keyid on tx path.
2020                  */
2021                 sinfo->sinfo_tsn = 1;
2022                 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
2023         }
2024 }
2025 
2026 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
2027 {
2028         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
2029         struct sctp_transport *transport = NULL;
2030         struct sctp_sndrcvinfo _sinfo, *sinfo;
2031         struct sctp_association *asoc, *tmp;
2032         struct sctp_cmsgs cmsgs;
2033         union sctp_addr *daddr;
2034         bool new = false;
2035         __u16 sflags;
2036         int err;
2037 
2038         /* Parse and get snd_info */
2039         err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
2040         if (err)
2041                 goto out;
2042 
2043         sinfo  = &_sinfo;
2044         sflags = sinfo->sinfo_flags;
2045 
2046         /* Get daddr from msg */
2047         daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
2048         if (IS_ERR(daddr)) {
2049                 err = PTR_ERR(daddr);
2050                 goto out;
2051         }
2052 
2053         lock_sock(sk);
2054 
2055         /* SCTP_SENDALL process */
2056         if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
2057                 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
2058                         err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2059                                                         msg_len);
2060                         if (err == 0)
2061                                 continue;
2062                         if (err < 0)
2063                                 goto out_unlock;
2064 
2065                         sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2066 
2067                         err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
2068                                                    NULL, sinfo);
2069                         if (err < 0)
2070                                 goto out_unlock;
2071 
2072                         iov_iter_revert(&msg->msg_iter, err);
2073                 }
2074 
2075                 goto out_unlock;
2076         }
2077 
2078         /* Get and check or create asoc */
2079         if (daddr) {
2080                 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2081                 if (asoc) {
2082                         err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2083                                                         msg_len);
2084                         if (err <= 0)
2085                                 goto out_unlock;
2086                 } else {
2087                         err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2088                                                     &transport);
2089                         if (err)
2090                                 goto out_unlock;
2091 
2092                         asoc = transport->asoc;
2093                         new = true;
2094                 }
2095 
2096                 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2097                         transport = NULL;
2098         } else {
2099                 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2100                 if (!asoc) {
2101                         err = -EPIPE;
2102                         goto out_unlock;
2103                 }
2104 
2105                 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2106                 if (err <= 0)
2107                         goto out_unlock;
2108         }
2109 
2110         /* Update snd_info with the asoc */
2111         sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2112 
2113         /* Send msg to the asoc */
2114         err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2115         if (err < 0 && err != -ESRCH && new)
2116                 sctp_association_free(asoc);
2117 
2118 out_unlock:
2119         release_sock(sk);
2120 out:
2121         return sctp_error(sk, msg->msg_flags, err);
2122 }
2123 
2124 /* This is an extended version of skb_pull() that removes the data from the
2125  * start of a skb even when data is spread across the list of skb's in the
2126  * frag_list. len specifies the total amount of data that needs to be removed.
2127  * when 'len' bytes could be removed from the skb, it returns 0.
2128  * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2129  * could not be removed.
2130  */
2131 static int sctp_skb_pull(struct sk_buff *skb, int len)
2132 {
2133         struct sk_buff *list;
2134         int skb_len = skb_headlen(skb);
2135         int rlen;
2136 
2137         if (len <= skb_len) {
2138                 __skb_pull(skb, len);
2139                 return 0;
2140         }
2141         len -= skb_len;
2142         __skb_pull(skb, skb_len);
2143 
2144         skb_walk_frags(skb, list) {
2145                 rlen = sctp_skb_pull(list, len);
2146                 skb->len -= (len-rlen);
2147                 skb->data_len -= (len-rlen);
2148 
2149                 if (!rlen)
2150                         return 0;
2151 
2152                 len = rlen;
2153         }
2154 
2155         return len;
2156 }
2157 
2158 /* API 3.1.3  recvmsg() - UDP Style Syntax
2159  *
2160  *  ssize_t recvmsg(int socket, struct msghdr *message,
2161  *                    int flags);
2162  *
2163  *  socket  - the socket descriptor of the endpoint.
2164  *  message - pointer to the msghdr structure which contains a single
2165  *            user message and possibly some ancillary data.
2166  *
2167  *            See Section 5 for complete description of the data
2168  *            structures.
2169  *
2170  *  flags   - flags sent or received with the user message, see Section
2171  *            5 for complete description of the flags.
2172  */
2173 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2174                         int noblock, int flags, int *addr_len)
2175 {
2176         struct sctp_ulpevent *event = NULL;
2177         struct sctp_sock *sp = sctp_sk(sk);
2178         struct sk_buff *skb, *head_skb;
2179         int copied;
2180         int err = 0;
2181         int skb_len;
2182 
2183         pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2184                  "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2185                  addr_len);
2186 
2187         lock_sock(sk);
2188 
2189         if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2190             !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2191                 err = -ENOTCONN;
2192                 goto out;
2193         }
2194 
2195         skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2196         if (!skb)
2197                 goto out;
2198 
2199         /* Get the total length of the skb including any skb's in the
2200          * frag_list.
2201          */
2202         skb_len = skb->len;
2203 
2204         copied = skb_len;
2205         if (copied > len)
2206                 copied = len;
2207 
2208         err = skb_copy_datagram_msg(skb, 0, msg, copied);
2209 
2210         event = sctp_skb2event(skb);
2211 
2212         if (err)
2213                 goto out_free;
2214 
2215         if (event->chunk && event->chunk->head_skb)
2216                 head_skb = event->chunk->head_skb;
2217         else
2218                 head_skb = skb;
2219         sock_recv_ts_and_drops(msg, sk, head_skb);
2220         if (sctp_ulpevent_is_notification(event)) {
2221                 msg->msg_flags |= MSG_NOTIFICATION;
2222                 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2223         } else {
2224                 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2225         }
2226 
2227         /* Check if we allow SCTP_NXTINFO. */
2228         if (sp->recvnxtinfo)
2229                 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2230         /* Check if we allow SCTP_RCVINFO. */
2231         if (sp->recvrcvinfo)
2232                 sctp_ulpevent_read_rcvinfo(event, msg);
2233         /* Check if we allow SCTP_SNDRCVINFO. */
2234         if (sp->subscribe.sctp_data_io_event)
2235                 sctp_ulpevent_read_sndrcvinfo(event, msg);
2236 
2237         err = copied;
2238 
2239         /* If skb's length exceeds the user's buffer, update the skb and
2240          * push it back to the receive_queue so that the next call to
2241          * recvmsg() will return the remaining data. Don't set MSG_EOR.
2242          */
2243         if (skb_len > copied) {
2244                 msg->msg_flags &= ~MSG_EOR;
2245                 if (flags & MSG_PEEK)
2246                         goto out_free;
2247                 sctp_skb_pull(skb, copied);
2248                 skb_queue_head(&sk->sk_receive_queue, skb);
2249 
2250                 /* When only partial message is copied to the user, increase
2251                  * rwnd by that amount. If all the data in the skb is read,
2252                  * rwnd is updated when the event is freed.
2253                  */
2254                 if (!sctp_ulpevent_is_notification(event))
2255                         sctp_assoc_rwnd_increase(event->asoc, copied);
2256                 goto out;
2257         } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2258                    (event->msg_flags & MSG_EOR))
2259                 msg->msg_flags |= MSG_EOR;
2260         else
2261                 msg->msg_flags &= ~MSG_EOR;
2262 
2263 out_free:
2264         if (flags & MSG_PEEK) {
2265                 /* Release the skb reference acquired after peeking the skb in
2266                  * sctp_skb_recv_datagram().
2267                  */
2268                 kfree_skb(skb);
2269         } else {
2270                 /* Free the event which includes releasing the reference to
2271                  * the owner of the skb, freeing the skb and updating the
2272                  * rwnd.
2273                  */
2274                 sctp_ulpevent_free(event);
2275         }
2276 out:
2277         release_sock(sk);
2278         return err;
2279 }
2280 
2281 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2282  *
2283  * This option is a on/off flag.  If enabled no SCTP message
2284  * fragmentation will be performed.  Instead if a message being sent
2285  * exceeds the current PMTU size, the message will NOT be sent and
2286  * instead a error will be indicated to the user.
2287  */
2288 static int sctp_setsockopt_disable_fragments(struct sock *sk,
2289                                              char __user *optval,
2290                                              unsigned int optlen)
2291 {
2292         int val;
2293 
2294         if (optlen < sizeof(int))
2295                 return -EINVAL;
2296 
2297         if (get_user(val, (int __user *)optval))
2298                 return -EFAULT;
2299 
2300         sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2301 
2302         return 0;
2303 }
2304 
2305 static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2306                                   unsigned int optlen)
2307 {
2308         struct sctp_association *asoc;
2309         struct sctp_ulpevent *event;
2310 
2311         if (optlen > sizeof(struct sctp_event_subscribe))
2312                 return -EINVAL;
2313         if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2314                 return -EFAULT;
2315 
2316         /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2317          * if there is no data to be sent or retransmit, the stack will
2318          * immediately send up this notification.
2319          */
2320         if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2321                                        &sctp_sk(sk)->subscribe)) {
2322                 asoc = sctp_id2assoc(sk, 0);
2323 
2324                 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2325                         event = sctp_ulpevent_make_sender_dry_event(asoc,
2326                                         GFP_USER | __GFP_NOWARN);
2327                         if (!event)
2328                                 return -ENOMEM;
2329 
2330                         asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2331                 }
2332         }
2333 
2334         return 0;
2335 }
2336 
2337 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2338  *
2339  * This socket option is applicable to the UDP-style socket only.  When
2340  * set it will cause associations that are idle for more than the
2341  * specified number of seconds to automatically close.  An association
2342  * being idle is defined an association that has NOT sent or received
2343  * user data.  The special value of '' indicates that no automatic
2344  * close of any associations should be performed.  The option expects an
2345  * integer defining the number of seconds of idle time before an
2346  * association is closed.
2347  */
2348 static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2349                                      unsigned int optlen)
2350 {
2351         struct sctp_sock *sp = sctp_sk(sk);
2352         struct net *net = sock_net(sk);
2353 
2354         /* Applicable to UDP-style socket only */
2355         if (sctp_style(sk, TCP))
2356                 return -EOPNOTSUPP;
2357         if (optlen != sizeof(int))
2358                 return -EINVAL;
2359         if (copy_from_user(&sp->autoclose, optval, optlen))
2360                 return -EFAULT;
2361 
2362         if (sp->autoclose > net->sctp.max_autoclose)
2363                 sp->autoclose = net->sctp.max_autoclose;
2364 
2365         return 0;
2366 }
2367 
2368 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2369  *
2370  * Applications can enable or disable heartbeats for any peer address of
2371  * an association, modify an address's heartbeat interval, force a
2372  * heartbeat to be sent immediately, and adjust the address's maximum
2373  * number of retransmissions sent before an address is considered
2374  * unreachable.  The following structure is used to access and modify an
2375  * address's parameters:
2376  *
2377  *  struct sctp_paddrparams {
2378  *     sctp_assoc_t            spp_assoc_id;
2379  *     struct sockaddr_storage spp_address;
2380  *     uint32_t                spp_hbinterval;
2381  *     uint16_t                spp_pathmaxrxt;
2382  *     uint32_t                spp_pathmtu;
2383  *     uint32_t                spp_sackdelay;
2384  *     uint32_t                spp_flags;
2385  *     uint32_t                spp_ipv6_flowlabel;
2386  *     uint8_t                 spp_dscp;
2387  * };
2388  *
2389  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2390  *                     application, and identifies the association for
2391  *                     this query.
2392  *   spp_address     - This specifies which address is of interest.
2393  *   spp_hbinterval  - This contains the value of the heartbeat interval,
2394  *                     in milliseconds.  If a  value of zero
2395  *                     is present in this field then no changes are to
2396  *                     be made to this parameter.
2397  *   spp_pathmaxrxt  - This contains the maximum number of
2398  *                     retransmissions before this address shall be
2399  *                     considered unreachable. If a  value of zero
2400  *                     is present in this field then no changes are to
2401  *                     be made to this parameter.
2402  *   spp_pathmtu     - When Path MTU discovery is disabled the value
2403  *                     specified here will be the "fixed" path mtu.
2404  *                     Note that if the spp_address field is empty
2405  *                     then all associations on this address will
2406  *                     have this fixed path mtu set upon them.
2407  *
2408  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2409  *                     the number of milliseconds that sacks will be delayed
2410  *                     for. This value will apply to all addresses of an
2411  *                     association if the spp_address field is empty. Note
2412  *                     also, that if delayed sack is enabled and this
2413  *                     value is set to 0, no change is made to the last
2414  *                     recorded delayed sack timer value.
2415  *
2416  *   spp_flags       - These flags are used to control various features
2417  *                     on an association. The flag field may contain
2418  *                     zero or more of the following options.
2419  *
2420  *                     SPP_HB_ENABLE  - Enable heartbeats on the
2421  *                     specified address. Note that if the address
2422  *                     field is empty all addresses for the association
2423  *                     have heartbeats enabled upon them.
2424  *
2425  *                     SPP_HB_DISABLE - Disable heartbeats on the
2426  *                     speicifed address. Note that if the address
2427  *                     field is empty all addresses for the association
2428  *                     will have their heartbeats disabled. Note also
2429  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2430  *                     mutually exclusive, only one of these two should
2431  *                     be specified. Enabling both fields will have
2432  *                     undetermined results.
2433  *
2434  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2435  *                     to be made immediately.
2436  *
2437  *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2438  *                     heartbeat delayis to be set to the value of 0
2439  *                     milliseconds.
2440  *
2441  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2442  *                     discovery upon the specified address. Note that
2443  *                     if the address feild is empty then all addresses
2444  *                     on the association are effected.
2445  *
2446  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2447  *                     discovery upon the specified address. Note that
2448  *                     if the address feild is empty then all addresses
2449  *                     on the association are effected. Not also that
2450  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2451  *                     exclusive. Enabling both will have undetermined
2452  *                     results.
2453  *
2454  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2455  *                     on delayed sack. The time specified in spp_sackdelay
2456  *                     is used to specify the sack delay for this address. Note
2457  *                     that if spp_address is empty then all addresses will
2458  *                     enable delayed sack and take on the sack delay
2459  *                     value specified in spp_sackdelay.
2460  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2461  *                     off delayed sack. If the spp_address field is blank then
2462  *                     delayed sack is disabled for the entire association. Note
2463  *                     also that this field is mutually exclusive to
2464  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2465  *                     results.
2466  *
2467  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
2468  *                     setting of the IPV6 flow label value.  The value is
2469  *                     contained in the spp_ipv6_flowlabel field.
2470  *                     Upon retrieval, this flag will be set to indicate that
2471  *                     the spp_ipv6_flowlabel field has a valid value returned.
2472  *                     If a specific destination address is set (in the
2473  *                     spp_address field), then the value returned is that of
2474  *                     the address.  If just an association is specified (and
2475  *                     no address), then the association's default flow label
2476  *                     is returned.  If neither an association nor a destination
2477  *                     is specified, then the socket's default flow label is
2478  *                     returned.  For non-IPv6 sockets, this flag will be left
2479  *                     cleared.
2480  *
2481  *                     SPP_DSCP:  Setting this flag enables the setting of the
2482  *                     Differentiated Services Code Point (DSCP) value
2483  *                     associated with either the association or a specific
2484  *                     address.  The value is obtained in the spp_dscp field.
2485  *                     Upon retrieval, this flag will be set to indicate that
2486  *                     the spp_dscp field has a valid value returned.  If a
2487  *                     specific destination address is set when called (in the
2488  *                     spp_address field), then that specific destination
2489  *                     address's DSCP value is returned.  If just an association
2490  *                     is specified, then the association's default DSCP is
2491  *                     returned.  If neither an association nor a destination is
2492  *                     specified, then the socket's default DSCP is returned.
2493  *
2494  *   spp_ipv6_flowlabel
2495  *                   - This field is used in conjunction with the
2496  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2497  *                     The 20 least significant bits are used for the flow
2498  *                     label.  This setting has precedence over any IPv6-layer
2499  *                     setting.
2500  *
2501  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
2502  *                     and contains the DSCP.  The 6 most significant bits are
2503  *                     used for the DSCP.  This setting has precedence over any
2504  *                     IPv4- or IPv6- layer setting.
2505  */
2506 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2507                                        struct sctp_transport   *trans,
2508                                        struct sctp_association *asoc,
2509                                        struct sctp_sock        *sp,
2510                                        int                      hb_change,
2511                                        int                      pmtud_change,
2512                                        int                      sackdelay_change)
2513 {
2514         int error;
2515 
2516         if (params->spp_flags & SPP_HB_DEMAND && trans) {
2517                 struct net *net = sock_net(trans->asoc->base.sk);
2518 
2519                 error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2520                 if (error)
2521                         return error;
2522         }
2523 
2524         /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2525          * this field is ignored.  Note also that a value of zero indicates
2526          * the current setting should be left unchanged.
2527          */
2528         if (params->spp_flags & SPP_HB_ENABLE) {
2529 
2530                 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2531                  * set.  This lets us use 0 value when this flag
2532                  * is set.
2533                  */
2534                 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2535                         params->spp_hbinterval = 0;
2536 
2537                 if (params->spp_hbinterval ||
2538                     (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2539                         if (trans) {
2540                                 trans->hbinterval =
2541                                     msecs_to_jiffies(params->spp_hbinterval);
2542                         } else if (asoc) {
2543                                 asoc->hbinterval =
2544                                     msecs_to_jiffies(params->spp_hbinterval);
2545                         } else {
2546                                 sp->hbinterval = params->spp_hbinterval;
2547                         }
2548                 }
2549         }
2550 
2551         if (hb_change) {
2552                 if (trans) {
2553                         trans->param_flags =
2554                                 (trans->param_flags & ~SPP_HB) | hb_change;
2555                 } else if (asoc) {
2556                         asoc->param_flags =
2557                                 (asoc->param_flags & ~SPP_HB) | hb_change;
2558                 } else {
2559                         sp->param_flags =
2560                                 (sp->param_flags & ~SPP_HB) | hb_change;
2561                 }
2562         }
2563 
2564         /* When Path MTU discovery is disabled the value specified here will
2565          * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2566          * include the flag SPP_PMTUD_DISABLE for this field to have any
2567          * effect).
2568          */
2569         if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2570                 if (trans) {
2571                         trans->pathmtu = params->spp_pathmtu;
2572                         sctp_assoc_sync_pmtu(asoc);
2573                 } else if (asoc) {
2574                         sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2575                 } else {
2576                         sp->pathmtu = params->spp_pathmtu;
2577                 }
2578         }
2579 
2580         if (pmtud_change) {
2581                 if (trans) {
2582                         int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2583                                 (params->spp_flags & SPP_PMTUD_ENABLE);
2584                         trans->param_flags =
2585                                 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2586                         if (update) {
2587                                 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2588                                 sctp_assoc_sync_pmtu(asoc);
2589                         }
2590                 } else if (asoc) {
2591                         asoc->param_flags =
2592                                 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2593                 } else {
2594                         sp->param_flags =
2595                                 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2596                 }
2597         }
2598 
2599         /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2600          * value of this field is ignored.  Note also that a value of zero
2601          * indicates the current setting should be left unchanged.
2602          */
2603         if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2604                 if (trans) {
2605                         trans->sackdelay =
2606                                 msecs_to_jiffies(params->spp_sackdelay);
2607                 } else if (asoc) {
2608                         asoc->sackdelay =
2609                                 msecs_to_jiffies(params->spp_sackdelay);
2610                 } else {
2611                         sp->sackdelay = params->spp_sackdelay;
2612                 }
2613         }
2614 
2615         if (sackdelay_change) {
2616                 if (trans) {
2617                         trans->param_flags =
2618                                 (trans->param_flags & ~SPP_SACKDELAY) |
2619                                 sackdelay_change;
2620                 } else if (asoc) {
2621                         asoc->param_flags =
2622                                 (asoc->param_flags & ~SPP_SACKDELAY) |
2623                                 sackdelay_change;
2624                 } else {
2625                         sp->param_flags =
2626                                 (sp->param_flags & ~SPP_SACKDELAY) |
2627                                 sackdelay_change;
2628                 }
2629         }
2630 
2631         /* Note that a value of zero indicates the current setting should be
2632            left unchanged.
2633          */
2634         if (params->spp_pathmaxrxt) {
2635                 if (trans) {
2636                         trans->pathmaxrxt = params->spp_pathmaxrxt;
2637                 } else if (asoc) {
2638                         asoc->pathmaxrxt = params->spp_pathmaxrxt;
2639                 } else {
2640                         sp->pathmaxrxt = params->spp_pathmaxrxt;
2641                 }
2642         }
2643 
2644         if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2645                 if (trans) {
2646                         if (trans->ipaddr.sa.sa_family == AF_INET6) {
2647                                 trans->flowlabel = params->spp_ipv6_flowlabel &
2648                                                    SCTP_FLOWLABEL_VAL_MASK;
2649                                 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2650                         }
2651                 } else if (asoc) {
2652                         struct sctp_transport *t;
2653 
2654                         list_for_each_entry(t, &asoc->peer.transport_addr_list,
2655                                             transports) {
2656                                 if (t->ipaddr.sa.sa_family != AF_INET6)
2657                                         continue;
2658                                 t->flowlabel = params->spp_ipv6_flowlabel &
2659                                                SCTP_FLOWLABEL_VAL_MASK;
2660                                 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2661                         }
2662                         asoc->flowlabel = params->spp_ipv6_flowlabel &
2663                                           SCTP_FLOWLABEL_VAL_MASK;
2664                         asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2665                 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2666                         sp->flowlabel = params->spp_ipv6_flowlabel &
2667                                         SCTP_FLOWLABEL_VAL_MASK;
2668                         sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2669                 }
2670         }
2671 
2672         if (params->spp_flags & SPP_DSCP) {
2673                 if (trans) {
2674                         trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2675                         trans->dscp |= SCTP_DSCP_SET_MASK;
2676                 } else if (asoc) {
2677                         struct sctp_transport *t;
2678 
2679                         list_for_each_entry(t, &asoc->peer.transport_addr_list,
2680                                             transports) {
2681                                 t->dscp = params->spp_dscp &
2682                                           SCTP_DSCP_VAL_MASK;
2683                                 t->dscp |= SCTP_DSCP_SET_MASK;
2684                         }
2685                         asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2686                         asoc->dscp |= SCTP_DSCP_SET_MASK;
2687                 } else {
2688                         sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2689                         sp->dscp |= SCTP_DSCP_SET_MASK;
2690                 }
2691         }
2692 
2693         return 0;
2694 }
2695 
2696 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2697                                             char __user *optval,
2698                                             unsigned int optlen)
2699 {
2700         struct sctp_paddrparams  params;
2701         struct sctp_transport   *trans = NULL;
2702         struct sctp_association *asoc = NULL;
2703         struct sctp_sock        *sp = sctp_sk(sk);
2704         int error;
2705         int hb_change, pmtud_change, sackdelay_change;
2706 
2707         if (optlen == sizeof(params)) {
2708                 if (copy_from_user(&params, optval, optlen))
2709                         return -EFAULT;
2710         } else if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2711                                             spp_ipv6_flowlabel), 4)) {
2712                 if (copy_from_user(&params, optval, optlen))
2713                         return -EFAULT;
2714                 if (params.spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2715                         return -EINVAL;
2716         } else {
2717                 return -EINVAL;
2718         }
2719 
2720         /* Validate flags and value parameters. */
2721         hb_change        = params.spp_flags & SPP_HB;
2722         pmtud_change     = params.spp_flags & SPP_PMTUD;
2723         sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2724 
2725         if (hb_change        == SPP_HB ||
2726             pmtud_change     == SPP_PMTUD ||
2727             sackdelay_change == SPP_SACKDELAY ||
2728             params.spp_sackdelay > 500 ||
2729             (params.spp_pathmtu &&
2730              params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2731                 return -EINVAL;
2732 
2733         /* If an address other than INADDR_ANY is specified, and
2734          * no transport is found, then the request is invalid.
2735          */
2736         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2737                 trans = sctp_addr_id2transport(sk, &params.spp_address,
2738                                                params.spp_assoc_id);
2739                 if (!trans)
2740                         return -EINVAL;
2741         }
2742 
2743         /* Get association, if assoc_id != 0 and the socket is a one
2744          * to many style socket, and an association was not found, then
2745          * the id was invalid.
2746          */
2747         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2748         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2749                 return -EINVAL;
2750 
2751         /* Heartbeat demand can only be sent on a transport or
2752          * association, but not a socket.
2753          */
2754         if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2755                 return -EINVAL;
2756 
2757         /* Process parameters. */
2758         error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2759                                             hb_change, pmtud_change,
2760                                             sackdelay_change);
2761 
2762         if (error)
2763                 return error;
2764 
2765         /* If changes are for association, also apply parameters to each
2766          * transport.
2767          */
2768         if (!trans && asoc) {
2769                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2770                                 transports) {
2771                         sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2772                                                     hb_change, pmtud_change,
2773                                                     sackdelay_change);
2774                 }
2775         }
2776 
2777         return 0;
2778 }
2779 
2780 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2781 {
2782         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2783 }
2784 
2785 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2786 {
2787         return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2788 }
2789 
2790 /*
2791  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2792  *
2793  * This option will effect the way delayed acks are performed.  This
2794  * option allows you to get or set the delayed ack time, in
2795  * milliseconds.  It also allows changing the delayed ack frequency.
2796  * Changing the frequency to 1 disables the delayed sack algorithm.  If
2797  * the assoc_id is 0, then this sets or gets the endpoints default
2798  * values.  If the assoc_id field is non-zero, then the set or get
2799  * effects the specified association for the one to many model (the
2800  * assoc_id field is ignored by the one to one model).  Note that if
2801  * sack_delay or sack_freq are 0 when setting this option, then the
2802  * current values will remain unchanged.
2803  *
2804  * struct sctp_sack_info {
2805  *     sctp_assoc_t            sack_assoc_id;
2806  *     uint32_t                sack_delay;
2807  *     uint32_t                sack_freq;
2808  * };
2809  *
2810  * sack_assoc_id -  This parameter, indicates which association the user
2811  *    is performing an action upon.  Note that if this field's value is
2812  *    zero then the endpoints default value is changed (effecting future
2813  *    associations only).
2814  *
2815  * sack_delay -  This parameter contains the number of milliseconds that
2816  *    the user is requesting the delayed ACK timer be set to.  Note that
2817  *    this value is defined in the standard to be between 200 and 500
2818  *    milliseconds.
2819  *
2820  * sack_freq -  This parameter contains the number of packets that must
2821  *    be received before a sack is sent without waiting for the delay
2822  *    timer to expire.  The default value for this is 2, setting this
2823  *    value to 1 will disable the delayed sack algorithm.
2824  */
2825 
2826 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2827                                        char __user *optval, unsigned int optlen)
2828 {
2829         struct sctp_sack_info    params;
2830         struct sctp_transport   *trans = NULL;
2831         struct sctp_association *asoc = NULL;
2832         struct sctp_sock        *sp = sctp_sk(sk);
2833 
2834         if (optlen == sizeof(struct sctp_sack_info)) {
2835                 if (copy_from_user(&params, optval, optlen))
2836                         return -EFAULT;
2837 
2838                 if (params.sack_delay == 0 && params.sack_freq == 0)
2839                         return 0;
2840         } else if (optlen == sizeof(struct sctp_assoc_value)) {
2841                 pr_warn_ratelimited(DEPRECATED
2842                                     "%s (pid %d) "
2843                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2844                                     "Use struct sctp_sack_info instead\n",
2845                                     current->comm, task_pid_nr(current));
2846                 if (copy_from_user(&params, optval, optlen))
2847                         return -EFAULT;
2848 
2849                 if (params.sack_delay == 0)
2850                         params.sack_freq = 1;
2851                 else
2852                         params.sack_freq = 0;
2853         } else
2854                 return -EINVAL;
2855 
2856         /* Validate value parameter. */
2857         if (params.sack_delay > 500)
2858                 return -EINVAL;
2859 
2860         /* Get association, if sack_assoc_id != 0 and the socket is a one
2861          * to many style socket, and an association was not found, then
2862          * the id was invalid.
2863          */
2864         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2865         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2866                 return -EINVAL;
2867 
2868         if (params.sack_delay) {
2869                 if (asoc) {
2870                         asoc->sackdelay =
2871                                 msecs_to_jiffies(params.sack_delay);
2872                         asoc->param_flags =
2873                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2874                 } else {
2875                         sp->sackdelay = params.sack_delay;
2876                         sp->param_flags =
2877                                 sctp_spp_sackdelay_enable(sp->param_flags);
2878                 }
2879         }
2880 
2881         if (params.sack_freq == 1) {
2882                 if (asoc) {
2883                         asoc->param_flags =
2884                                 sctp_spp_sackdelay_disable(asoc->param_flags);
2885                 } else {
2886                         sp->param_flags =
2887                                 sctp_spp_sackdelay_disable(sp->param_flags);
2888                 }
2889         } else if (params.sack_freq > 1) {
2890                 if (asoc) {
2891                         asoc->sackfreq = params.sack_freq;
2892                         asoc->param_flags =
2893                                 sctp_spp_sackdelay_enable(asoc->param_flags);
2894                 } else {
2895                         sp->sackfreq = params.sack_freq;
2896                         sp->param_flags =
2897                                 sctp_spp_sackdelay_enable(sp->param_flags);
2898                 }
2899         }
2900 
2901         /* If change is for association, also apply to each transport. */
2902         if (asoc) {
2903                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2904                                 transports) {
2905                         if (params.sack_delay) {
2906                                 trans->sackdelay =
2907                                         msecs_to_jiffies(params.sack_delay);
2908                                 trans->param_flags =
2909                                         sctp_spp_sackdelay_enable(trans->param_flags);
2910                         }
2911                         if (params.sack_freq == 1) {
2912                                 trans->param_flags =
2913                                         sctp_spp_sackdelay_disable(trans->param_flags);
2914                         } else if (params.sack_freq > 1) {
2915                                 trans->sackfreq = params.sack_freq;
2916                                 trans->param_flags =
2917                                         sctp_spp_sackdelay_enable(trans->param_flags);
2918                         }
2919                 }
2920         }
2921 
2922         return 0;
2923 }
2924 
2925 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2926  *
2927  * Applications can specify protocol parameters for the default association
2928  * initialization.  The option name argument to setsockopt() and getsockopt()
2929  * is SCTP_INITMSG.
2930  *
2931  * Setting initialization parameters is effective only on an unconnected
2932  * socket (for UDP-style sockets only future associations are effected
2933  * by the change).  With TCP-style sockets, this option is inherited by
2934  * sockets derived from a listener socket.
2935  */
2936 static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2937 {
2938         struct sctp_initmsg sinit;
2939         struct sctp_sock *sp = sctp_sk(sk);
2940 
2941         if (optlen != sizeof(struct sctp_initmsg))
2942                 return -EINVAL;
2943         if (copy_from_user(&sinit, optval, optlen))
2944                 return -EFAULT;
2945 
2946         if (sinit.sinit_num_ostreams)
2947                 sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2948         if (sinit.sinit_max_instreams)
2949                 sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2950         if (sinit.sinit_max_attempts)
2951                 sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2952         if (sinit.sinit_max_init_timeo)
2953                 sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2954 
2955         return 0;
2956 }
2957 
2958 /*
2959  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2960  *
2961  *   Applications that wish to use the sendto() system call may wish to
2962  *   specify a default set of parameters that would normally be supplied
2963  *   through the inclusion of ancillary data.  This socket option allows
2964  *   such an application to set the default sctp_sndrcvinfo structure.
2965  *   The application that wishes to use this socket option simply passes
2966  *   in to this call the sctp_sndrcvinfo structure defined in Section
2967  *   5.2.2) The input parameters accepted by this call include
2968  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2969  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2970  *   to this call if the caller is using the UDP model.
2971  */
2972 static int sctp_setsockopt_default_send_param(struct sock *sk,
2973                                               char __user *optval,
2974                                               unsigned int optlen)
2975 {
2976         struct sctp_sock *sp = sctp_sk(sk);
2977         struct sctp_association *asoc;
2978         struct sctp_sndrcvinfo info;
2979 
2980         if (optlen != sizeof(info))
2981                 return -EINVAL;
2982         if (copy_from_user(&info, optval, optlen))
2983                 return -EFAULT;
2984         if (info.sinfo_flags &
2985             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2986               SCTP_ABORT | SCTP_EOF))
2987                 return -EINVAL;
2988 
2989         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2990         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2991                 return -EINVAL;
2992         if (asoc) {
2993                 asoc->default_stream = info.sinfo_stream;
2994                 asoc->default_flags = info.sinfo_flags;
2995                 asoc->default_ppid = info.sinfo_ppid;
2996                 asoc->default_context = info.sinfo_context;
2997                 asoc->default_timetolive = info.sinfo_timetolive;
2998         } else {
2999                 sp->default_stream = info.sinfo_stream;
3000                 sp->default_flags = info.sinfo_flags;
3001                 sp->default_ppid = info.sinfo_ppid;
3002                 sp->default_context = info.sinfo_context;
3003                 sp->default_timetolive = info.sinfo_timetolive;
3004         }
3005 
3006         return 0;
3007 }
3008 
3009 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
3010  * (SCTP_DEFAULT_SNDINFO)
3011  */
3012 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
3013                                            char __user *optval,
3014                                            unsigned int optlen)
3015 {
3016         struct sctp_sock *sp = sctp_sk(sk);
3017         struct sctp_association *asoc;
3018         struct sctp_sndinfo info;
3019 
3020         if (optlen != sizeof(info))
3021                 return -EINVAL;
3022         if (copy_from_user(&info, optval, optlen))
3023                 return -EFAULT;
3024         if (info.snd_flags &
3025             ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
3026               SCTP_ABORT | SCTP_EOF))
3027                 return -EINVAL;
3028 
3029         asoc = sctp_id2assoc(sk, info.snd_assoc_id);
3030         if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
3031                 return -EINVAL;
3032         if (asoc) {
3033                 asoc->default_stream = info.snd_sid;
3034                 asoc->default_flags = info.snd_flags;
3035                 asoc->default_ppid = info.snd_ppid;
3036                 asoc->default_context = info.snd_context;
3037         } else {
3038                 sp->default_stream = info.snd_sid;
3039                 sp->default_flags = info.snd_flags;
3040                 sp->default_ppid = info.snd_ppid;
3041                 sp->default_context = info.snd_context;
3042         }
3043 
3044         return 0;
3045 }
3046 
3047 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3048  *
3049  * Requests that the local SCTP stack use the enclosed peer address as
3050  * the association primary.  The enclosed address must be one of the
3051  * association peer's addresses.
3052  */
3053 static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
3054                                         unsigned int optlen)
3055 {
3056         struct sctp_prim prim;
3057         struct sctp_transport *trans;
3058         struct sctp_af *af;
3059         int err;
3060 
3061         if (optlen != sizeof(struct sctp_prim))
3062                 return -EINVAL;
3063 
3064         if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
3065                 return -EFAULT;
3066 
3067         /* Allow security module to validate address but need address len. */
3068         af = sctp_get_af_specific(prim.ssp_addr.ss_family);
3069         if (!af)
3070                 return -EINVAL;
3071 
3072         err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3073                                          (struct sockaddr *)&prim.ssp_addr,
3074                                          af->sockaddr_len);
3075         if (err)
3076                 return err;
3077 
3078         trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
3079         if (!trans)
3080                 return -EINVAL;
3081 
3082         sctp_assoc_set_primary(trans->asoc, trans);
3083 
3084         return 0;
3085 }
3086 
3087 /*
3088  * 7.1.5 SCTP_NODELAY
3089  *
3090  * Turn on/off any Nagle-like algorithm.  This means that packets are
3091  * generally sent as soon as possible and no unnecessary delays are
3092  * introduced, at the cost of more packets in the network.  Expects an
3093  *  integer boolean flag.
3094  */
3095 static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
3096                                    unsigned int optlen)
3097 {
3098         int val;
3099 
3100         if (optlen < sizeof(int))
3101                 return -EINVAL;
3102         if (get_user(val, (int __user *)optval))
3103                 return -EFAULT;
3104 
3105         sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
3106         return 0;
3107 }
3108 
3109 /*
3110  *
3111  * 7.1.1 SCTP_RTOINFO
3112  *
3113  * The protocol parameters used to initialize and bound retransmission
3114  * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3115  * and modify these parameters.
3116  * All parameters are time values, in milliseconds.  A value of 0, when
3117  * modifying the parameters, indicates that the current value should not
3118  * be changed.
3119  *
3120  */
3121 static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
3122 {
3123         struct sctp_rtoinfo rtoinfo;
3124         struct sctp_association *asoc;
3125         unsigned long rto_min, rto_max;
3126         struct sctp_sock *sp = sctp_sk(sk);
3127 
3128         if (optlen != sizeof (struct sctp_rtoinfo))
3129                 return -EINVAL;
3130 
3131         if (copy_from_user(&rtoinfo, optval, optlen))
3132                 return -EFAULT;
3133 
3134         asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
3135 
3136         /* Set the values to the specific association */
3137         if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
3138                 return -EINVAL;
3139 
3140         rto_max = rtoinfo.srto_max;
3141         rto_min = rtoinfo.srto_min;
3142 
3143         if (rto_max)
3144                 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3145         else
3146                 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3147 
3148         if (rto_min)
3149                 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3150         else
3151                 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3152 
3153         if (rto_min > rto_max)
3154                 return -EINVAL;
3155 
3156         if (asoc) {
3157                 if (rtoinfo.srto_initial != 0)
3158                         asoc->rto_initial =
3159                                 msecs_to_jiffies(rtoinfo.srto_initial);
3160                 asoc->rto_max = rto_max;
3161                 asoc->rto_min = rto_min;
3162         } else {
3163                 /* If there is no association or the association-id = 0
3164                  * set the values to the endpoint.
3165                  */
3166                 if (rtoinfo.srto_initial != 0)
3167                         sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3168                 sp->rtoinfo.srto_max = rto_max;
3169                 sp->rtoinfo.srto_min = rto_min;
3170         }
3171 
3172         return 0;
3173 }
3174 
3175 /*
3176  *
3177  * 7.1.2 SCTP_ASSOCINFO
3178  *
3179  * This option is used to tune the maximum retransmission attempts
3180  * of the association.
3181  * Returns an error if the new association retransmission value is
3182  * greater than the sum of the retransmission value  of the peer.
3183  * See [SCTP] for more information.
3184  *
3185  */
3186 static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
3187 {
3188 
3189         struct sctp_assocparams assocparams;
3190         struct sctp_association *asoc;
3191 
3192         if (optlen != sizeof(struct sctp_assocparams))
3193                 return -EINVAL;
3194         if (copy_from_user(&assocparams, optval, optlen))
3195                 return -EFAULT;
3196 
3197         asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
3198 
3199         if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
3200                 return -EINVAL;
3201 
3202         /* Set the values to the specific association */
3203         if (asoc) {
3204                 if (assocparams.sasoc_asocmaxrxt != 0) {
3205                         __u32 path_sum = 0;
3206                         int   paths = 0;
3207                         struct sctp_transport *peer_addr;
3208 
3209                         list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3210                                         transports) {
3211                                 path_sum += peer_addr->pathmaxrxt;
3212                                 paths++;
3213                         }
3214 
3215                         /* Only validate asocmaxrxt if we have more than
3216                          * one path/transport.  We do this because path
3217                          * retransmissions are only counted when we have more
3218                          * then one path.
3219                          */
3220                         if (paths > 1 &&
3221                             assocparams.sasoc_asocmaxrxt > path_sum)
3222                                 return -EINVAL;
3223 
3224                         asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3225                 }
3226 
3227                 if (assocparams.sasoc_cookie_life != 0)
3228                         asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
3229         } else {
3230                 /* Set the values to the endpoint */
3231                 struct sctp_sock *sp = sctp_sk(sk);
3232 
3233                 if (assocparams.sasoc_asocmaxrxt != 0)
3234                         sp->assocparams.sasoc_asocmaxrxt =
3235                                                 assocparams.sasoc_asocmaxrxt;
3236                 if (assocparams.sasoc_cookie_life != 0)
3237                         sp->assocparams.sasoc_cookie_life =
3238                                                 assocparams.sasoc_cookie_life;
3239         }
3240         return 0;
3241 }
3242 
3243 /*
3244  * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3245  *
3246  * This socket option is a boolean flag which turns on or off mapped V4
3247  * addresses.  If this option is turned on and the socket is type
3248  * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3249  * If this option is turned off, then no mapping will be done of V4
3250  * addresses and a user will receive both PF_INET6 and PF_INET type
3251  * addresses on the socket.
3252  */
3253 static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
3254 {
3255         int val;
3256         struct sctp_sock *sp = sctp_sk(sk);
3257 
3258         if (optlen < sizeof(int))
3259                 return -EINVAL;
3260         if (get_user(val, (int __user *)optval))
3261                 return -EFAULT;
3262         if (val)
3263                 sp->v4mapped = 1;
3264         else
3265                 sp->v4mapped = 0;
3266 
3267         return 0;
3268 }
3269 
3270 /*
3271  * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3272  * This option will get or set the maximum size to put in any outgoing
3273  * SCTP DATA chunk.  If a message is larger than this size it will be
3274  * fragmented by SCTP into the specified size.  Note that the underlying
3275  * SCTP implementation may fragment into smaller sized chunks when the
3276  * PMTU of the underlying association is smaller than the value set by
3277  * the user.  The default value for this option is '' which indicates
3278  * the user is NOT limiting fragmentation and only the PMTU will effect
3279  * SCTP's choice of DATA chunk size.  Note also that values set larger
3280  * than the maximum size of an IP datagram will effectively let SCTP
3281  * control fragmentation (i.e. the same as setting this option to 0).
3282  *
3283  * The following structure is used to access and modify this parameter:
3284  *
3285  * struct sctp_assoc_value {
3286  *   sctp_assoc_t assoc_id;
3287  *   uint32_t assoc_value;
3288  * };
3289  *
3290  * assoc_id:  This parameter is ignored for one-to-one style sockets.
3291  *    For one-to-many style sockets this parameter indicates which
3292  *    association the user is performing an action upon.  Note that if
3293  *    this field's value is zero then the endpoints default value is
3294  *    changed (effecting future associations only).
3295  * assoc_value:  This parameter specifies the maximum size in bytes.
3296  */
3297 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
3298 {
3299         struct sctp_sock *sp = sctp_sk(sk);
3300         struct sctp_assoc_value params;
3301         struct sctp_association *asoc;
3302         int val;
3303 
3304         if (optlen == sizeof(int)) {
3305                 pr_warn_ratelimited(DEPRECATED
3306                                     "%s (pid %d) "
3307                                     "Use of int in maxseg socket option.\n"
3308                                     "Use struct sctp_assoc_value instead\n",
3309                                     current->comm, task_pid_nr(current));
3310                 if (copy_from_user(&val, optval, optlen))
3311                         return -EFAULT;
3312                 params.assoc_id = 0;
3313         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3314                 if (copy_from_user(&params, optval, optlen))
3315                         return -EFAULT;
3316                 val = params.assoc_value;
3317         } else {
3318                 return -EINVAL;
3319         }
3320 
3321         asoc = sctp_id2assoc(sk, params.assoc_id);
3322 
3323         if (val) {
3324                 int min_len, max_len;
3325                 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3326                                  sizeof(struct sctp_data_chunk);
3327 
3328                 min_len = sctp_min_frag_point(sp, datasize);
3329                 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3330 
3331                 if (val < min_len || val > max_len)
3332                         return -EINVAL;
3333         }
3334 
3335         if (asoc) {
3336                 asoc->user_frag = val;
3337                 sctp_assoc_update_frag_point(asoc);
3338         } else {
3339                 if (params.assoc_id && sctp_style(sk, UDP))
3340                         return -EINVAL;
3341                 sp->user_frag = val;
3342         }
3343 
3344         return 0;
3345 }
3346 
3347 
3348 /*
3349  *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3350  *
3351  *   Requests that the peer mark the enclosed address as the association
3352  *   primary. The enclosed address must be one of the association's
3353  *   locally bound addresses. The following structure is used to make a
3354  *   set primary request:
3355  */
3356 static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3357                                              unsigned int optlen)
3358 {
3359         struct net *net = sock_net(sk);
3360         struct sctp_sock        *sp;
3361         struct sctp_association *asoc = NULL;
3362         struct sctp_setpeerprim prim;
3363         struct sctp_chunk       *chunk;
3364         struct sctp_af          *af;
3365         int                     err;
3366 
3367         sp = sctp_sk(sk);
3368 
3369         if (!net->sctp.addip_enable)
3370                 return -EPERM;
3371 
3372         if (optlen != sizeof(struct sctp_setpeerprim))
3373                 return -EINVAL;
3374 
3375         if (copy_from_user(&prim, optval, optlen))
3376                 return -EFAULT;
3377 
3378         asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3379         if (!asoc)
3380                 return -EINVAL;
3381 
3382         if (!asoc->peer.asconf_capable)
3383                 return -EPERM;
3384 
3385         if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3386                 return -EPERM;
3387 
3388         if (!sctp_state(asoc, ESTABLISHED))
3389                 return -ENOTCONN;
3390 
3391         af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3392         if (!af)
3393                 return -EINVAL;
3394 
3395         if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3396                 return -EADDRNOTAVAIL;
3397 
3398         if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3399                 return -EADDRNOTAVAIL;
3400 
3401         /* Allow security module to validate address. */
3402         err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3403                                          (struct sockaddr *)&prim.sspp_addr,
3404                                          af->sockaddr_len);
3405         if (err)
3406                 return err;
3407 
3408         /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3409         chunk = sctp_make_asconf_set_prim(asoc,
3410                                           (union sctp_addr *)&prim.sspp_addr);
3411         if (!chunk)
3412                 return -ENOMEM;
3413 
3414         err = sctp_send_asconf(asoc, chunk);
3415 
3416         pr_debug("%s: we set peer primary addr primitively\n", __func__);
3417 
3418         return err;
3419 }
3420 
3421 static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3422                                             unsigned int optlen)
3423 {
3424         struct sctp_setadaptation adaptation;
3425 
3426         if (optlen != sizeof(struct sctp_setadaptation))
3427                 return -EINVAL;
3428         if (copy_from_user(&adaptation, optval, optlen))
3429                 return -EFAULT;
3430 
3431         sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3432 
3433         return 0;
3434 }
3435 
3436 /*
3437  * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3438  *
3439  * The context field in the sctp_sndrcvinfo structure is normally only
3440  * used when a failed message is retrieved holding the value that was
3441  * sent down on the actual send call.  This option allows the setting of
3442  * a default context on an association basis that will be received on
3443  * reading messages from the peer.  This is especially helpful in the
3444  * one-2-many model for an application to keep some reference to an
3445  * internal state machine that is processing messages on the
3446  * association.  Note that the setting of this value only effects
3447  * received messages from the peer and does not effect the value that is
3448  * saved with outbound messages.
3449  */
3450 static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3451                                    unsigned int optlen)
3452 {
3453         struct sctp_assoc_value params;
3454         struct sctp_sock *sp;
3455         struct sctp_association *asoc;
3456 
3457         if (optlen != sizeof(struct sctp_assoc_value))
3458                 return -EINVAL;
3459         if (copy_from_user(&params, optval, optlen))
3460                 return -EFAULT;
3461 
3462         sp = sctp_sk(sk);
3463 
3464         if (params.assoc_id != 0) {
3465                 asoc = sctp_id2assoc(sk, params.assoc_id);
3466                 if (!asoc)
3467                         return -EINVAL;
3468                 asoc->default_rcv_context = params.assoc_value;
3469         } else {
3470                 sp->default_rcv_context = params.assoc_value;
3471         }
3472 
3473         return 0;
3474 }
3475 
3476 /*
3477  * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3478  *
3479  * This options will at a minimum specify if the implementation is doing
3480  * fragmented interleave.  Fragmented interleave, for a one to many
3481  * socket, is when subsequent calls to receive a message may return
3482  * parts of messages from different associations.  Some implementations
3483  * may allow you to turn this value on or off.  If so, when turned off,
3484  * no fragment interleave will occur (which will cause a head of line
3485  * blocking amongst multiple associations sharing the same one to many
3486  * socket).  When this option is turned on, then each receive call may
3487  * come from a different association (thus the user must receive data
3488  * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3489  * association each receive belongs to.
3490  *
3491  * This option takes a boolean value.  A non-zero value indicates that
3492  * fragmented interleave is on.  A value of zero indicates that
3493  * fragmented interleave is off.
3494  *
3495  * Note that it is important that an implementation that allows this
3496  * option to be turned on, have it off by default.  Otherwise an unaware
3497  * application using the one to many model may become confused and act
3498  * incorrectly.
3499  */
3500 static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3501                                                char __user *optval,
3502                                                unsigned int optlen)
3503 {
3504         int val;
3505 
3506         if (optlen != sizeof(int))
3507                 return -EINVAL;
3508         if (get_user(val, (int __user *)optval))
3509                 return -EFAULT;
3510 
3511         sctp_sk(sk)->frag_interleave = !!val;
3512 
3513         if (!sctp_sk(sk)->frag_interleave)
3514                 sctp_sk(sk)->strm_interleave = 0;
3515 
3516         return 0;
3517 }
3518 
3519 /*
3520  * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3521  *       (SCTP_PARTIAL_DELIVERY_POINT)
3522  *
3523  * This option will set or get the SCTP partial delivery point.  This
3524  * point is the size of a message where the partial delivery API will be
3525  * invoked to help free up rwnd space for the peer.  Setting this to a
3526  * lower value will cause partial deliveries to happen more often.  The
3527  * calls argument is an integer that sets or gets the partial delivery
3528  * point.  Note also that the call will fail if the user attempts to set
3529  * this value larger than the socket receive buffer size.
3530  *
3531  * Note that any single message having a length smaller than or equal to
3532  * the SCTP partial delivery point will be delivered in one single read
3533  * call as long as the user provided buffer is large enough to hold the
3534  * message.
3535  */
3536 static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3537                                                   char __user *optval,
3538                                                   unsigned int optlen)
3539 {
3540         u32 val;
3541 
3542         if (optlen != sizeof(u32))
3543                 return -EINVAL;
3544         if (get_user(val, (int __user *)optval))
3545                 return -EFAULT;
3546 
3547         /* Note: We double the receive buffer from what the user sets
3548          * it to be, also initial rwnd is based on rcvbuf/2.
3549          */
3550         if (val > (sk->sk_rcvbuf >> 1))
3551                 return -EINVAL;
3552 
3553         sctp_sk(sk)->pd_point = val;
3554 
3555         return 0; /* is this the right error code? */
3556 }
3557 
3558 /*
3559  * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3560  *
3561  * This option will allow a user to change the maximum burst of packets
3562  * that can be emitted by this association.  Note that the default value
3563  * is 4, and some implementations may restrict this setting so that it
3564  * can only be lowered.
3565  *
3566  * NOTE: This text doesn't seem right.  Do this on a socket basis with
3567  * future associations inheriting the socket value.
3568  */
3569 static int sctp_setsockopt_maxburst(struct sock *sk,
3570                                     char __user *optval,
3571                                     unsigned int optlen)
3572 {
3573         struct sctp_assoc_value params;
3574         struct sctp_sock *sp;
3575         struct sctp_association *asoc;
3576         int val;
3577         int assoc_id = 0;
3578 
3579         if (optlen == sizeof(int)) {
3580                 pr_warn_ratelimited(DEPRECATED
3581                                     "%s (pid %d) "
3582                                     "Use of int in max_burst socket option deprecated.\n"
3583                                     "Use struct sctp_assoc_value instead\n",
3584                                     current->comm, task_pid_nr(current));
3585                 if (copy_from_user(&val, optval, optlen))
3586                         return -EFAULT;
3587         } else if (optlen == sizeof(struct sctp_assoc_value)) {
3588                 if (copy_from_user(&params, optval, optlen))
3589                         return -EFAULT;
3590                 val = params.assoc_value;
3591                 assoc_id = params.assoc_id;
3592         } else
3593                 return -EINVAL;
3594 
3595         sp = sctp_sk(sk);
3596 
3597         if (assoc_id != 0) {
3598                 asoc = sctp_id2assoc(sk, assoc_id);
3599                 if (!asoc)
3600                         return -EINVAL;
3601                 asoc->max_burst = val;
3602         } else
3603                 sp->max_burst = val;
3604 
3605         return 0;
3606 }
3607 
3608 /*
3609  * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3610  *
3611  * This set option adds a chunk type that the user is requesting to be
3612  * received only in an authenticated way.  Changes to the list of chunks
3613  * will only effect future associations on the socket.
3614  */
3615 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3616                                       char __user *optval,
3617                                       unsigned int optlen)
3618 {
3619         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3620         struct sctp_authchunk val;
3621 
3622         if (!ep->auth_enable)
3623                 return -EACCES;
3624 
3625         if (optlen != sizeof(struct sctp_authchunk))
3626                 return -EINVAL;
3627         if (copy_from_user(&val, optval, optlen))
3628                 return -EFAULT;
3629 
3630         switch (val.sauth_chunk) {
3631         case SCTP_CID_INIT:
3632         case SCTP_CID_INIT_ACK:
3633         case SCTP_CID_SHUTDOWN_COMPLETE:
3634         case SCTP_CID_AUTH:
3635                 return -EINVAL;
3636         }
3637 
3638         /* add this chunk id to the endpoint */
3639         return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3640 }
3641 
3642 /*
3643  * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3644  *
3645  * This option gets or sets the list of HMAC algorithms that the local
3646  * endpoint requires the peer to use.
3647  */
3648 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3649                                       char __user *optval,
3650                                       unsigned int optlen)
3651 {
3652         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3653         struct sctp_hmacalgo *hmacs;
3654         u32 idents;
3655         int err;
3656 
3657         if (!ep->auth_enable)
3658                 return -EACCES;
3659 
3660         if (optlen < sizeof(struct sctp_hmacalgo))
3661                 return -EINVAL;
3662         optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3663                                              SCTP_AUTH_NUM_HMACS * sizeof(u16));
3664 
3665         hmacs = memdup_user(optval, optlen);
3666         if (IS_ERR(hmacs))
3667                 return PTR_ERR(hmacs);
3668 
3669         idents = hmacs->shmac_num_idents;
3670         if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3671             (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3672                 err = -EINVAL;
3673                 goto out;
3674         }
3675 
3676         err = sctp_auth_ep_set_hmacs(ep, hmacs);
3677 out:
3678         kfree(hmacs);
3679         return err;
3680 }
3681 
3682 /*
3683  * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3684  *
3685  * This option will set a shared secret key which is used to build an
3686  * association shared key.
3687  */
3688 static int sctp_setsockopt_auth_key(struct sock *sk,
3689                                     char __user *optval,
3690                                     unsigned int optlen)
3691 {
3692         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3693         struct sctp_authkey *authkey;
3694         struct sctp_association *asoc;
3695         int ret;
3696 
3697         if (!ep->auth_enable)
3698                 return -EACCES;
3699 
3700         if (optlen <= sizeof(struct sctp_authkey))
3701                 return -EINVAL;
3702         /* authkey->sca_keylength is u16, so optlen can't be bigger than
3703          * this.
3704          */
3705         optlen = min_t(unsigned int, optlen, USHRT_MAX +
3706                                              sizeof(struct sctp_authkey));
3707 
3708         authkey = memdup_user(optval, optlen);
3709         if (IS_ERR(authkey))
3710                 return PTR_ERR(authkey);
3711 
3712         if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3713                 ret = -EINVAL;
3714                 goto out;
3715         }
3716 
3717         asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3718         if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3719                 ret = -EINVAL;
3720                 goto out;
3721         }
3722 
3723         ret = sctp_auth_set_key(ep, asoc, authkey);
3724 out:
3725         kzfree(authkey);
3726         return ret;
3727 }
3728 
3729 /*
3730  * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3731  *
3732  * This option will get or set the active shared key to be used to build
3733  * the association shared key.
3734  */
3735 static int sctp_setsockopt_active_key(struct sock *sk,
3736                                       char __user *optval,
3737                                       unsigned int optlen)
3738 {
3739         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3740         struct sctp_authkeyid val;
3741         struct sctp_association *asoc;
3742 
3743         if (!ep->auth_enable)
3744                 return -EACCES;
3745 
3746         if (optlen != sizeof(struct sctp_authkeyid))
3747                 return -EINVAL;
3748         if (copy_from_user(&val, optval, optlen))
3749                 return -EFAULT;
3750 
3751         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3752         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3753                 return -EINVAL;
3754 
3755         return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3756 }
3757 
3758 /*
3759  * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3760  *
3761  * This set option will delete a shared secret key from use.
3762  */
3763 static int sctp_setsockopt_del_key(struct sock *sk,
3764                                    char __user *optval,
3765                                    unsigned int optlen)
3766 {
3767         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3768         struct sctp_authkeyid val;
3769         struct sctp_association *asoc;
3770 
3771         if (!ep->auth_enable)
3772                 return -EACCES;
3773 
3774         if (optlen != sizeof(struct sctp_authkeyid))
3775                 return -EINVAL;
3776         if (copy_from_user(&val, optval, optlen))
3777                 return -EFAULT;
3778 
3779         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3780         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3781                 return -EINVAL;
3782 
3783         return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3784 
3785 }
3786 
3787 /*
3788  * 8.3.4  Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3789  *
3790  * This set option will deactivate a shared secret key.
3791  */
3792 static int sctp_setsockopt_deactivate_key(struct sock *sk, char __user *optval,
3793                                           unsigned int optlen)
3794 {
3795         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3796         struct sctp_authkeyid val;
3797         struct sctp_association *asoc;
3798 
3799         if (!ep->auth_enable)
3800                 return -EACCES;
3801 
3802         if (optlen != sizeof(struct sctp_authkeyid))
3803                 return -EINVAL;
3804         if (copy_from_user(&val, optval, optlen))
3805                 return -EFAULT;
3806 
3807         asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3808         if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3809                 return -EINVAL;
3810 
3811         return sctp_auth_deact_key_id(ep, asoc, val.scact_keynumber);
3812 }
3813 
3814 /*
3815  * 8.1.23 SCTP_AUTO_ASCONF
3816  *
3817  * This option will enable or disable the use of the automatic generation of
3818  * ASCONF chunks to add and delete addresses to an existing association.  Note
3819  * that this option has two caveats namely: a) it only affects sockets that
3820  * are bound to all addresses available to the SCTP stack, and b) the system
3821  * administrator may have an overriding control that turns the ASCONF feature
3822  * off no matter what setting the socket option may have.
3823  * This option expects an integer boolean flag, where a non-zero value turns on
3824  * the option, and a zero value turns off the option.
3825  * Note. In this implementation, socket operation overrides default parameter
3826  * being set by sysctl as well as FreeBSD implementation
3827  */
3828 static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3829                                         unsigned int optlen)
3830 {
3831         int val;
3832         struct sctp_sock *sp = sctp_sk(sk);
3833 
3834         if (optlen < sizeof(int))
3835                 return -EINVAL;
3836         if (get_user(val, (int __user *)optval))
3837                 return -EFAULT;
3838         if (!sctp_is_ep_boundall(sk) && val)
3839                 return -EINVAL;
3840         if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3841                 return 0;
3842 
3843         spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3844         if (val == 0 && sp->do_auto_asconf) {
3845                 list_del(&sp->auto_asconf_list);
3846                 sp->do_auto_asconf = 0;
3847         } else if (val && !sp->do_auto_asconf) {
3848                 list_add_tail(&sp->auto_asconf_list,
3849                     &sock_net(sk)->sctp.auto_asconf_splist);
3850                 sp->do_auto_asconf = 1;
3851         }
3852         spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3853         return 0;
3854 }
3855 
3856 /*
3857  * SCTP_PEER_ADDR_THLDS
3858  *
3859  * This option allows us to alter the partially failed threshold for one or all
3860  * transports in an association.  See Section 6.1 of:
3861  * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3862  */
3863 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3864                                             char __user *optval,
3865                                             unsigned int optlen)
3866 {
3867         struct sctp_paddrthlds val;
3868         struct sctp_transport *trans;
3869         struct sctp_association *asoc;
3870 
3871         if (optlen < sizeof(struct sctp_paddrthlds))
3872                 return -EINVAL;
3873         if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3874                            sizeof(struct sctp_paddrthlds)))
3875                 return -EFAULT;
3876 
3877 
3878         if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3879                 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3880                 if (!asoc)
3881                         return -ENOENT;
3882                 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3883                                     transports) {
3884                         if (val.spt_pathmaxrxt)
3885                                 trans->pathmaxrxt = val.spt_pathmaxrxt;
3886                         trans->pf_retrans = val.spt_pathpfthld;
3887                 }
3888 
3889                 if (val.spt_pathmaxrxt)
3890                         asoc->pathmaxrxt = val.spt_pathmaxrxt;
3891                 asoc->pf_retrans = val.spt_pathpfthld;
3892         } else {
3893                 trans = sctp_addr_id2transport(sk, &val.spt_address,
3894                                                val.spt_assoc_id);
3895                 if (!trans)
3896                         return -ENOENT;
3897 
3898                 if (val.spt_pathmaxrxt)
3899                         trans->pathmaxrxt = val.spt_pathmaxrxt;
3900                 trans->pf_retrans = val.spt_pathpfthld;
3901         }
3902 
3903         return 0;
3904 }
3905 
3906 static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
3907                                        char __user *optval,
3908                                        unsigned int optlen)
3909 {
3910         int val;
3911 
3912         if (optlen < sizeof(int))
3913                 return -EINVAL;
3914         if (get_user(val, (int __user *) optval))
3915                 return -EFAULT;
3916 
3917         sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;
3918 
3919         return 0;
3920 }
3921 
3922 static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
3923                                        char __user *optval,
3924                                        unsigned int optlen)
3925 {
3926         int val;
3927 
3928         if (optlen < sizeof(int))
3929                 return -EINVAL;
3930         if (get_user(val, (int __user *) optval))
3931                 return -EFAULT;
3932 
3933         sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;
3934 
3935         return 0;
3936 }
3937 
3938 static int sctp_setsockopt_pr_supported(struct sock *sk,
3939                                         char __user *optval,
3940                                         unsigned int optlen)
3941 {
3942         struct sctp_assoc_value params;
3943 
3944         if (optlen != sizeof(params))
3945                 return -EINVAL;
3946 
3947         if (copy_from_user(&params, optval, optlen))
3948                 return -EFAULT;
3949 
3950         sctp_sk(sk)->ep->prsctp_enable = !!params.assoc_value;
3951 
3952         return 0;
3953 }
3954 
3955 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3956                                           char __user *optval,
3957                                           unsigned int optlen)
3958 {
3959         struct sctp_default_prinfo info;
3960         struct sctp_association *asoc;
3961         int retval = -EINVAL;
3962 
3963         if (optlen != sizeof(info))
3964                 goto out;
3965 
3966         if (copy_from_user(&info, optval, sizeof(info))) {
3967                 retval = -EFAULT;
3968                 goto out;
3969         }
3970 
3971         if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
3972                 goto out;
3973 
3974         if (info.pr_policy == SCTP_PR_SCTP_NONE)
3975                 info.pr_value = 0;
3976 
3977         asoc = sctp_id2assoc(sk, info.pr_assoc_id);
3978         if (asoc) {
3979                 SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
3980                 asoc->default_timetolive = info.pr_value;
3981         } else if (!info.pr_assoc_id) {
3982                 struct sctp_sock *sp = sctp_sk(sk);
3983 
3984                 SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
3985                 sp->default_timetolive = info.pr_value;
3986         } else {
3987                 goto out;
3988         }
3989 
3990         retval = 0;
3991 
3992 out:
3993         return retval;
3994 }
3995 
3996 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
3997                                               char __user *optval,
3998                                               unsigned int optlen)
3999 {
4000         struct sctp_assoc_value params;
4001         struct sctp_association *asoc;
4002         int retval = -EINVAL;
4003 
4004         if (optlen != sizeof(params))
4005                 goto out;
4006 
4007         if (copy_from_user(&params, optval, optlen)) {
4008                 retval = -EFAULT;
4009                 goto out;
4010         }
4011 
4012         asoc = sctp_id2assoc(sk, params.assoc_id);
4013         if (asoc) {
4014                 asoc->reconf_enable = !!params.assoc_value;
4015         } else if (!params.assoc_id) {
4016                 struct sctp_sock *sp = sctp_sk(sk);
4017 
4018                 sp->ep->reconf_enable = !!params.assoc_value;
4019         } else {
4020                 goto out;
4021         }
4022 
4023         retval = 0;
4024 
4025 out:
4026         return retval;
4027 }
4028 
4029 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4030                                            char __user *optval,
4031                                            unsigned int optlen)
4032 {
4033         struct sctp_assoc_value params;
4034         struct sctp_association *asoc;
4035         int retval = -EINVAL;
4036 
4037         if (optlen != sizeof(params))
4038                 goto out;
4039 
4040         if (copy_from_user(&params, optval, optlen)) {
4041                 retval = -EFAULT;
4042                 goto out;
4043         }
4044 
4045         if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4046                 goto out;
4047 
4048         asoc = sctp_id2assoc(sk, params.assoc_id);
4049         if (asoc) {
4050                 asoc->strreset_enable = params.assoc_value;
4051         } else if (!params.assoc_id) {
4052                 struct sctp_sock *sp = sctp_sk(sk);
4053 
4054                 sp->ep->strreset_enable = params.assoc_value;
4055         } else {
4056                 goto out;
4057         }
4058 
4059         retval = 0;
4060 
4061 out:
4062         return retval;
4063 }
4064 
4065 static int sctp_setsockopt_reset_streams(struct sock *sk,
4066                                          char __user *optval,
4067                                          unsigned int optlen)
4068 {
4069         struct sctp_reset_streams *params;
4070         struct sctp_association *asoc;
4071         int retval = -EINVAL;
4072 
4073         if (optlen < sizeof(*params))
4074                 return -EINVAL;
4075         /* srs_number_streams is u16, so optlen can't be bigger than this. */
4076         optlen = min_t(unsigned int, optlen, USHRT_MAX +
4077                                              sizeof(__u16) * sizeof(*params));
4078 
4079         params = memdup_user(optval, optlen);
4080         if (IS_ERR(params))
4081                 return PTR_ERR(params);
4082 
4083         if (params->srs_number_streams * sizeof(__u16) >
4084             optlen - sizeof(*params))
4085                 goto out;
4086 
4087         asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4088         if (!asoc)
4089                 goto out;
4090 
4091         retval = sctp_send_reset_streams(asoc, params);
4092 
4093 out:
4094         kfree(params);
4095         return retval;
4096 }
4097 
4098 static int sctp_setsockopt_reset_assoc(struct sock *sk,
4099                                        char __user *optval,
4100                                        unsigned int optlen)
4101 {
4102         struct sctp_association *asoc;
4103         sctp_assoc_t associd;
4104         int retval = -EINVAL;
4105 
4106         if (optlen != sizeof(associd))
4107                 goto out;
4108 
4109         if (copy_from_user(&associd, optval, optlen)) {
4110                 retval = -EFAULT;
4111                 goto out;
4112         }
4113 
4114         asoc = sctp_id2assoc(sk, associd);
4115         if (!asoc)
4116                 goto out;
4117 
4118         retval = sctp_send_reset_assoc(asoc);
4119 
4120 out:
4121         return retval;
4122 }
4123 
4124 static int sctp_setsockopt_add_streams(struct sock *sk,
4125                                        char __user *optval,
4126                                        unsigned int optlen)
4127 {
4128         struct sctp_association *asoc;
4129         struct sctp_add_streams params;
4130         int retval = -EINVAL;
4131 
4132         if (optlen != sizeof(params))
4133                 goto out;
4134 
4135         if (copy_from_user(&params, optval, optlen)) {
4136                 retval = -EFAULT;
4137                 goto out;
4138         }
4139 
4140         asoc = sctp_id2assoc(sk, params.sas_assoc_id);
4141         if (!asoc)
4142                 goto out;
4143 
4144         retval = sctp_send_add_streams(asoc, &params);
4145 
4146 out:
4147         return retval;
4148 }
4149 
4150 static int sctp_setsockopt_scheduler(struct sock *sk,
4151                                      char __user *optval,
4152                                      unsigned int optlen)
4153 {
4154         struct sctp_association *asoc;
4155         struct sctp_assoc_value params;
4156         int retval = -EINVAL;
4157 
4158         if (optlen < sizeof(params))
4159                 goto out;
4160 
4161         optlen = sizeof(params);
4162         if (copy_from_user(&params, optval, optlen)) {
4163                 retval = -EFAULT;
4164                 goto out;
4165         }
4166 
4167         if (params.assoc_value > SCTP_SS_MAX)
4168                 goto out;
4169 
4170         asoc = sctp_id2assoc(sk, params.assoc_id);
4171         if (!asoc)
4172                 goto out;
4173 
4174         retval = sctp_sched_set_sched(asoc, params.assoc_value);
4175 
4176 out:
4177         return retval;
4178 }
4179 
4180 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4181                                            char __user *optval,
4182                                            unsigned int optlen)
4183 {
4184         struct sctp_association *asoc;
4185         struct sctp_stream_value params;
4186         int retval = -EINVAL;
4187 
4188         if (optlen < sizeof(params))
4189                 goto out;
4190 
4191         optlen = sizeof(params);
4192         if (copy_from_user(&params, optval, optlen)) {
4193                 retval = -EFAULT;
4194                 goto out;
4195         }
4196 
4197         asoc = sctp_id2assoc(sk, params.assoc_id);
4198         if (!asoc)
4199                 goto out;
4200 
4201         retval = sctp_sched_set_value(asoc, params.stream_id,
4202                                       params.stream_value, GFP_KERNEL);
4203 
4204 out:
4205         return retval;
4206 }
4207 
4208 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4209                                                   char __user *optval,
4210                                                   unsigned int optlen)
4211 {
4212         struct sctp_sock *sp = sctp_sk(sk);
4213         struct net *net = sock_net(sk);
4214         struct sctp_assoc_value params;
4215         int retval = -EINVAL;
4216 
4217         if (optlen < sizeof(params))
4218                 goto out;
4219 
4220         optlen = sizeof(params);
4221         if (copy_from_user(&params, optval, optlen)) {
4222                 retval = -EFAULT;
4223                 goto out;
4224         }
4225 
4226         if (params.assoc_id)
4227                 goto out;
4228 
4229         if (!net->sctp.intl_enable || !sp->frag_interleave) {
4230                 retval = -EPERM;
4231                 goto out;
4232         }
4233 
4234         sp->strm_interleave = !!params.assoc_value;
4235 
4236         retval = 0;
4237 
4238 out:
4239         return retval;
4240 }
4241 
4242 static int sctp_setsockopt_reuse_port(struct sock *sk, char __user *optval,
4243                                       unsigned int optlen)
4244 {
4245         int val;
4246 
4247         if (!sctp_style(sk, TCP))
4248                 return -EOPNOTSUPP;
4249 
4250         if (sctp_sk(sk)->ep->base.bind_addr.port)
4251                 return -EFAULT;
4252 
4253         if (optlen < sizeof(int))
4254                 return -EINVAL;
4255 
4256         if (get_user(val, (int __user *)optval))
4257                 return -EFAULT;
4258 
4259         sctp_sk(sk)->reuse = !!val;
4260 
4261         return 0;
4262 }
4263 
4264 /* API 6.2 setsockopt(), getsockopt()
4265  *
4266  * Applications use setsockopt() and getsockopt() to set or retrieve
4267  * socket options.  Socket options are used to change the default
4268  * behavior of sockets calls.  They are described in Section 7.
4269  *
4270  * The syntax is:
4271  *
4272  *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
4273  *                    int __user *optlen);
4274  *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4275  *                    int optlen);
4276  *
4277  *   sd      - the socket descript.
4278  *   level   - set to IPPROTO_SCTP for all SCTP options.
4279  *   optname - the option name.
4280  *   optval  - the buffer to store the value of the option.
4281  *   optlen  - the size of the buffer.
4282  */
4283 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4284                            char __user *optval, unsigned int optlen)
4285 {
4286         int retval = 0;
4287 
4288         pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4289 
4290         /* I can hardly begin to describe how wrong this is.  This is
4291          * so broken as to be worse than useless.  The API draft
4292          * REALLY is NOT helpful here...  I am not convinced that the
4293          * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4294          * are at all well-founded.
4295          */
4296         if (level != SOL_SCTP) {
4297                 struct sctp_af *af = sctp_sk(sk)->pf->af;
4298                 retval = af->setsockopt(sk, level, optname, optval, optlen);
4299                 goto out_nounlock;
4300         }
4301 
4302         lock_sock(sk);
4303 
4304         switch (optname) {
4305         case SCTP_SOCKOPT_BINDX_ADD:
4306                 /* 'optlen' is the size of the addresses buffer. */
4307                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4308                                                optlen, SCTP_BINDX_ADD_ADDR);
4309                 break;
4310 
4311         case SCTP_SOCKOPT_BINDX_REM:
4312                 /* 'optlen' is the size of the addresses buffer. */
4313                 retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
4314                                                optlen, SCTP_BINDX_REM_ADDR);
4315                 break;
4316 
4317         case SCTP_SOCKOPT_CONNECTX_OLD:
4318                 /* 'optlen' is the size of the addresses buffer. */
4319                 retval = sctp_setsockopt_connectx_old(sk,
4320                                             (struct sockaddr __user *)optval,
4321                                             optlen);
4322                 break;
4323 
4324         case SCTP_SOCKOPT_CONNECTX:
4325                 /* 'optlen' is the size of the addresses buffer. */
4326                 retval = sctp_setsockopt_connectx(sk,
4327                                             (struct sockaddr __user *)optval,
4328                                             optlen);
4329                 break;
4330 
4331         case SCTP_DISABLE_FRAGMENTS:
4332                 retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
4333                 break;
4334 
4335         case SCTP_EVENTS:
4336                 retval = sctp_setsockopt_events(sk, optval, optlen);
4337                 break;
4338 
4339         case SCTP_AUTOCLOSE:
4340                 retval = sctp_setsockopt_autoclose(sk, optval, optlen);
4341                 break;
4342 
4343         case SCTP_PEER_ADDR_PARAMS:
4344                 retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
4345                 break;
4346 
4347         case SCTP_DELAYED_SACK:
4348                 retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4349                 break;
4350         case SCTP_PARTIAL_DELIVERY_POINT:
4351                 retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
4352                 break;
4353 
4354         case SCTP_INITMSG:
4355                 retval = sctp_setsockopt_initmsg(sk, optval, optlen);
4356                 break;
4357         case SCTP_DEFAULT_SEND_PARAM:
4358                 retval = sctp_setsockopt_default_send_param(sk, optval,
4359                                                             optlen);
4360                 break;
4361         case SCTP_DEFAULT_SNDINFO:
4362                 retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
4363                 break;
4364         case SCTP_PRIMARY_ADDR:
4365                 retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
4366                 break;
4367         case SCTP_SET_PEER_PRIMARY_ADDR:
4368                 retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
4369                 break;
4370         case SCTP_NODELAY:
4371                 retval = sctp_setsockopt_nodelay(sk, optval, optlen);
4372                 break;
4373         case SCTP_RTOINFO:
4374                 retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
4375                 break;
4376         case SCTP_ASSOCINFO:
4377                 retval = sctp_setsockopt_associnfo(sk, optval, optlen);
4378                 break;
4379         case SCTP_I_WANT_MAPPED_V4_ADDR:
4380                 retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
4381                 break;
4382         case SCTP_MAXSEG:
4383                 retval = sctp_setsockopt_maxseg(sk, optval, optlen);
4384                 break;
4385         case SCTP_ADAPTATION_LAYER:
4386                 retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
4387                 break;
4388         case SCTP_CONTEXT:
4389                 retval = sctp_setsockopt_context(sk, optval, optlen);
4390                 break;
4391         case SCTP_FRAGMENT_INTERLEAVE:
4392                 retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
4393                 break;
4394         case SCTP_MAX_BURST:
4395                 retval = sctp_setsockopt_maxburst(sk, optval, optlen);
4396                 break;
4397         case SCTP_AUTH_CHUNK:
4398                 retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
4399                 break;
4400         case SCTP_HMAC_IDENT:
4401                 retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
4402                 break;
4403         case SCTP_AUTH_KEY:
4404                 retval = sctp_setsockopt_auth_key(sk, optval, optlen);
4405                 break;
4406         case SCTP_AUTH_ACTIVE_KEY:
4407                 retval = sctp_setsockopt_active_key(sk, optval, optlen);
4408                 break;
4409         case SCTP_AUTH_DELETE_KEY:
4410                 retval = sctp_setsockopt_del_key(sk, optval, optlen);
4411                 break;
4412         case SCTP_AUTH_DEACTIVATE_KEY:
4413                 retval = sctp_setsockopt_deactivate_key(sk, optval, optlen);
4414                 break;
4415         case SCTP_AUTO_ASCONF:
4416                 retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
4417                 break;
4418         case SCTP_PEER_ADDR_THLDS:
4419                 retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
4420                 break;
4421         case SCTP_RECVRCVINFO:
4422                 retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
4423                 break;
4424         case SCTP_RECVNXTINFO:
4425                 retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
4426                 break;
4427         case SCTP_PR_SUPPORTED:
4428                 retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
4429                 break;
4430         case SCTP_DEFAULT_PRINFO:
4431                 retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
4432                 break;
4433         case SCTP_RECONFIG_SUPPORTED:
4434                 retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
4435                 break;
4436         case SCTP_ENABLE_STREAM_RESET:
4437                 retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
4438                 break;
4439         case SCTP_RESET_STREAMS:
4440                 retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
4441                 break;
4442         case SCTP_RESET_ASSOC:
4443                 retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
4444                 break;
4445         case SCTP_ADD_STREAMS:
4446                 retval = sctp_setsockopt_add_streams(sk, optval, optlen);
4447                 break;
4448         case SCTP_STREAM_SCHEDULER:
4449                 retval = sctp_setsockopt_scheduler(sk, optval, optlen);
4450                 break;
4451         case SCTP_STREAM_SCHEDULER_VALUE:
4452                 retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
4453                 break;
4454         case SCTP_INTERLEAVING_SUPPORTED:
4455                 retval = sctp_setsockopt_interleaving_supported(sk, optval,
4456                                                                 optlen);
4457                 break;
4458         case SCTP_REUSE_PORT:
4459                 retval = sctp_setsockopt_reuse_port(sk, optval, optlen);
4460                 break;
4461         default:
4462                 retval = -ENOPROTOOPT;
4463                 break;
4464         }
4465 
4466         release_sock(sk);
4467 
4468 out_nounlock:
4469         return retval;
4470 }
4471 
4472 /* API 3.1.6 connect() - UDP Style Syntax
4473  *
4474  * An application may use the connect() call in the UDP model to initiate an
4475  * association without sending data.
4476  *
4477  * The syntax is:
4478  *
4479  * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4480  *
4481  * sd: the socket descriptor to have a new association added to.
4482  *
4483  * nam: the address structure (either struct sockaddr_in or struct
4484  *    sockaddr_in6 defined in RFC2553 [7]).
4485  *
4486  * len: the size of the address.
4487  */
4488 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4489                         int addr_len, int flags)
4490 {
4491         struct inet_sock *inet = inet_sk(sk);
4492         struct sctp_af *af;
4493         int err = 0;
4494 
4495         lock_sock(sk);
4496 
4497         pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4498                  addr, addr_len);
4499 
4500         /* We may need to bind the socket. */
4501         if (!inet->inet_num) {
4502                 if (sk->sk_prot->get_port(sk, 0)) {
4503                         release_sock(sk);
4504                         return -EAGAIN;
4505                 }
4506                 inet->inet_sport = htons(inet->inet_num);
4507         }
4508 
4509         /* Validate addr_len before calling common connect/connectx routine. */
4510         af = sctp_get_af_specific(addr->sa_family);
4511         if (!af || addr_len < af->sockaddr_len) {
4512                 err = -EINVAL;
4513         } else {
4514                 /* Pass correct addr len to common routine (so it knows there
4515                  * is only one address being passed.
4516                  */
4517                 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4518         }
4519 
4520         release_sock(sk);
4521         return err;
4522 }
4523 
4524 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4525                       int addr_len, int flags)
4526 {
4527         if (addr_len < sizeof(uaddr->sa_family))
4528                 return -EINVAL;
4529 
4530         if (uaddr->sa_family == AF_UNSPEC)
4531                 return -EOPNOTSUPP;
4532 
4533         return sctp_connect(sock->sk, uaddr, addr_len, flags);
4534 }
4535 
4536 /* FIXME: Write comments. */
4537 static int sctp_disconnect(struct sock *sk, int flags)
4538 {
4539         return -EOPNOTSUPP; /* STUB */
4540 }
4541 
4542 /* 4.1.4 accept() - TCP Style Syntax
4543  *
4544  * Applications use accept() call to remove an established SCTP
4545  * association from the accept queue of the endpoint.  A new socket
4546  * descriptor will be returned from accept() to represent the newly
4547  * formed association.
4548  */
4549 static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
4550 {
4551         struct sctp_sock *sp;
4552         struct sctp_endpoint *ep;
4553         struct sock *newsk = NULL;
4554         struct sctp_association *asoc;
4555         long timeo;
4556         int error = 0;
4557 
4558         lock_sock(sk);
4559 
4560         sp = sctp_sk(sk);
4561         ep = sp->ep;
4562 
4563         if (!sctp_style(sk, TCP)) {
4564                 error = -EOPNOTSUPP;
4565                 goto out;
4566         }
4567 
4568         if (!sctp_sstate(sk, LISTENING)) {
4569                 error = -EINVAL;
4570                 goto out;
4571         }
4572 
4573         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
4574 
4575         error = sctp_wait_for_accept(sk, timeo);
4576         if (error)
4577                 goto out;
4578 
4579         /* We treat the list of associations on the endpoint as the accept
4580          * queue and pick the first association on the list.
4581          */
4582         asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4583 
4584         newsk = sp->pf->create_accept_sk(sk, asoc, kern);
4585         if (!newsk) {
4586                 error = -ENOMEM;
4587                 goto out;
4588         }
4589 
4590         /* Populate the fields of the newsk from the oldsk and migrate the
4591          * asoc to the newsk.
4592          */
4593         sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4594 
4595 out:
4596         release_sock(sk);
4597         *err = error;
4598         return newsk;
4599 }
4600 
4601 /* The SCTP ioctl handler. */
4602 static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
4603 {
4604         int rc = -ENOTCONN;
4605 
4606         lock_sock(sk);
4607 
4608         /*
4609          * SEQPACKET-style sockets in LISTENING state are valid, for
4610          * SCTP, so only discard TCP-style sockets in LISTENING state.
4611          */
4612         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4613                 goto out;
4614 
4615         switch (cmd) {
4616         case SIOCINQ: {
4617                 struct sk_buff *skb;
4618                 unsigned int amount = 0;
4619 
4620                 skb = skb_peek(&sk->sk_receive_queue);
4621                 if (skb != NULL) {
4622                         /*
4623                          * We will only return the amount of this packet since
4624                          * that is all that will be read.
4625                          */
4626                         amount = skb->len;
4627                 }
4628                 rc = put_user(amount, (int __user *)arg);
4629                 break;
4630         }
4631         default:
4632                 rc = -ENOIOCTLCMD;
4633                 break;
4634         }
4635 out:
4636         release_sock(sk);
4637         return rc;
4638 }
4639 
4640 /* This is the function which gets called during socket creation to
4641  * initialized the SCTP-specific portion of the sock.
4642  * The sock structure should already be zero-filled memory.
4643  */
4644 static int sctp_init_sock(struct sock *sk)
4645 {
4646         struct net *net = sock_net(sk);
4647         struct sctp_sock *sp;
4648 
4649         pr_debug("%s: sk:%p\n", __func__, sk);
4650 
4651         sp = sctp_sk(sk);
4652 
4653         /* Initialize the SCTP per socket area.  */
4654         switch (sk->sk_type) {
4655         case SOCK_SEQPACKET:
4656                 sp->type = SCTP_SOCKET_UDP;
4657                 break;
4658         case SOCK_STREAM:
4659                 sp->type = SCTP_SOCKET_TCP;
4660                 break;
4661         default:
4662                 return -ESOCKTNOSUPPORT;
4663         }
4664 
4665         sk->sk_gso_type = SKB_GSO_SCTP;
4666 
4667         /* Initialize default send parameters. These parameters can be
4668          * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4669          */
4670         sp->default_stream = 0;
4671         sp->default_ppid = 0;
4672         sp->default_flags = 0;
4673         sp->default_context = 0;
4674         sp->default_timetolive = 0;
4675 
4676         sp->default_rcv_context = 0;
4677         sp->max_burst = net->sctp.max_burst;
4678 
4679         sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4680 
4681         /* Initialize default setup parameters. These parameters
4682          * can be modified with the SCTP_INITMSG socket option or
4683          * overridden by the SCTP_INIT CMSG.
4684          */
4685         sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
4686         sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4687         sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
4688         sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4689 
4690         /* Initialize default RTO related parameters.  These parameters can
4691          * be modified for with the SCTP_RTOINFO socket option.
4692          */
4693         sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4694         sp->rtoinfo.srto_max     = net->sctp.rto_max;
4695         sp->rtoinfo.srto_min     = net->sctp.rto_min;
4696 
4697         /* Initialize default association related parameters. These parameters
4698          * can be modified with the SCTP_ASSOCINFO socket option.
4699          */
4700         sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
4701         sp->assocparams.sasoc_number_peer_destinations = 0;
4702         sp->assocparams.sasoc_peer_rwnd = 0;
4703         sp->assocparams.sasoc_local_rwnd = 0;
4704         sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
4705 
4706         /* Initialize default event subscriptions. By default, all the
4707          * options are off.
4708          */
4709         memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
4710 
4711         /* Default Peer Address Parameters.  These defaults can
4712          * be modified via SCTP_PEER_ADDR_PARAMS
4713          */
4714         sp->hbinterval  = net->sctp.hb_interval;
4715         sp->pathmaxrxt  = net->sctp.max_retrans_path;
4716         sp->pathmtu     = 0; /* allow default discovery */
4717         sp->sackdelay   = net->sctp.sack_timeout;
4718         sp->sackfreq    = 2;
4719         sp->param_flags = SPP_HB_ENABLE |
4720                           SPP_PMTUD_ENABLE |
4721                           SPP_SACKDELAY_ENABLE;
4722 
4723         /* If enabled no SCTP message fragmentation will be performed.
4724          * Configure through SCTP_DISABLE_FRAGMENTS socket option.
4725          */
4726         sp->disable_fragments = 0;
4727 
4728         /* Enable Nagle algorithm by default.  */
4729         sp->nodelay           = 0;
4730 
4731         sp->recvrcvinfo = 0;
4732         sp->recvnxtinfo = 0;
4733 
4734         /* Enable by default. */
4735         sp->v4mapped          = 1;
4736 
4737         /* Auto-close idle associations after the configured
4738          * number of seconds.  A value of 0 disables this
4739          * feature.  Configure through the SCTP_AUTOCLOSE socket option,
4740          * for UDP-style sockets only.
4741          */
4742         sp->autoclose         = 0;
4743 
4744         /* User specified fragmentation limit. */
4745         sp->user_frag         = 0;
4746 
4747         sp->adaptation_ind = 0;
4748 
4749         sp->pf = sctp_get_pf_specific(sk->sk_family);
4750 
4751         /* Control variables for partial data delivery. */
4752         atomic_set(&sp->pd_mode, 0);
4753         skb_queue_head_init(&sp->pd_lobby);
4754         sp->frag_interleave = 0;
4755 
4756         /* Create a per socket endpoint structure.  Even if we
4757          * change the data structure relationships, this may still
4758          * be useful for storing pre-connect address information.
4759          */
4760         sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
4761         if (!sp->ep)
4762                 return -ENOMEM;
4763 
4764         sp->hmac = NULL;
4765 
4766         sk->sk_destruct = sctp_destruct_sock;
4767 
4768         SCTP_DBG_OBJCNT_INC(sock);
4769 
4770         local_bh_disable();
4771         sk_sockets_allocated_inc(sk);
4772         sock_prot_inuse_add(net, sk->sk_prot, 1);
4773 
4774         /* Nothing can fail after this block, otherwise
4775          * sctp_destroy_sock() will be called without addr_wq_lock held
4776          */
4777         if (net->sctp.default_auto_asconf) {
4778                 spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4779                 list_add_tail(&sp->auto_asconf_list,
4780                     &net->sctp.auto_asconf_splist);
4781                 sp->do_auto_asconf = 1;
4782                 spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
4783         } else {
4784                 sp->do_auto_asconf = 0;
4785         }
4786 
4787         local_bh_enable();
4788 
4789         return 0;
4790 }
4791 
4792 /* Cleanup any SCTP per socket resources. Must be called with
4793  * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
4794  */
4795 static void sctp_destroy_sock(struct sock *sk)
4796 {
4797         struct sctp_sock *sp;
4798 
4799         pr_debug("%s: sk:%p\n", __func__, sk);
4800 
4801         /* Release our hold on the endpoint. */
4802         sp = sctp_sk(sk);
4803         /* This could happen during socket init, thus we bail out
4804          * early, since the rest of the below is not setup either.
4805          */
4806         if (sp->ep == NULL)
4807                 return;
4808 
4809         if (sp->do_auto_asconf) {
4810                 sp->do_auto_asconf = 0;
4811                 list_del(&sp->auto_asconf_list);
4812         }
4813         sctp_endpoint_free(sp->ep);
4814         local_bh_disable();
4815         sk_sockets_allocated_dec(sk);
4816         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4817         local_bh_enable();
4818 }
4819 
4820 /* Triggered when there are no references on the socket anymore */
4821 static void sctp_destruct_sock(struct sock *sk)
4822 {
4823         struct sctp_sock *sp = sctp_sk(sk);
4824 
4825         /* Free up the HMAC transform. */
4826         crypto_free_shash(sp->hmac);
4827 
4828         inet_sock_destruct(sk);
4829 }
4830 
4831 /* API 4.1.7 shutdown() - TCP Style Syntax
4832  *     int shutdown(int socket, int how);
4833  *
4834  *     sd      - the socket descriptor of the association to be closed.
4835  *     how     - Specifies the type of shutdown.  The  values  are
4836  *               as follows:
4837  *               SHUT_RD
4838  *                     Disables further receive operations. No SCTP
4839  *                     protocol action is taken.
4840  *               SHUT_WR
4841  *                     Disables further send operations, and initiates
4842  *                     the SCTP shutdown sequence.
4843  *               SHUT_RDWR
4844  *                     Disables further send  and  receive  operations
4845  *                     and initiates the SCTP shutdown sequence.
4846  */
4847 static void sctp_shutdown(struct sock *sk, int how)
4848 {
4849         struct net *net = sock_net(sk);
4850         struct sctp_endpoint *ep;
4851 
4852         if (!sctp_style(sk, TCP))
4853                 return;
4854 
4855         ep = sctp_sk(sk)->ep;
4856         if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
4857                 struct sctp_association *asoc;
4858 
4859                 inet_sk_set_state(sk, SCTP_SS_CLOSING);
4860                 asoc = list_entry(ep->asocs.next,
4861                                   struct sctp_association, asocs);
4862                 sctp_primitive_SHUTDOWN(net, asoc, NULL);
4863         }
4864 }
4865 
4866 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
4867                        struct sctp_info *info)
4868 {
4869         struct sctp_transport *prim;
4870         struct list_head *pos;
4871         int mask;
4872 
4873         memset(info, 0, sizeof(*info));
4874         if (!asoc) {
4875                 struct sctp_sock *sp = sctp_sk(sk);
4876 
4877                 info->sctpi_s_autoclose = sp->autoclose;
4878                 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
4879                 info->sctpi_s_pd_point = sp->pd_point;
4880                 info->sctpi_s_nodelay = sp->nodelay;
4881                 info->sctpi_s_disable_fragments = sp->disable_fragments;
4882                 info->sctpi_s_v4mapped = sp->v4mapped;
4883                 info->sctpi_s_frag_interleave = sp->frag_interleave;
4884                 info->sctpi_s_type = sp->type;
4885 
4886                 return 0;
4887         }
4888 
4889         info->sctpi_tag = asoc->c.my_vtag;
4890         info->sctpi_state = asoc->state;
4891         info->sctpi_rwnd = asoc->a_rwnd;
4892         info->sctpi_unackdata = asoc->unack_data;
4893         info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4894         info->sctpi_instrms = asoc->stream.incnt;
4895         info->sctpi_outstrms = asoc->stream.outcnt;
4896         list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
4897                 info->sctpi_inqueue++;
4898         list_for_each(pos, &asoc->outqueue.out_chunk_list)
4899                 info->sctpi_outqueue++;
4900         info->sctpi_overall_error = asoc->overall_error_count;
4901         info->sctpi_max_burst = asoc->max_burst;
4902         info->sctpi_maxseg = asoc->frag_point;
4903         info->sctpi_peer_rwnd = asoc->peer.rwnd;
4904         info->sctpi_peer_tag = asoc->c.peer_vtag;
4905 
4906         mask = asoc->peer.ecn_capable << 1;
4907         mask = (mask | asoc->peer.ipv4_address) << 1;
4908         mask = (mask | asoc->peer.ipv6_address) << 1;
4909         mask = (mask | asoc->peer.hostname_address) << 1;
4910         mask = (mask | asoc->peer.asconf_capable) << 1;
4911         mask = (mask | asoc->peer.prsctp_capable) << 1;
4912         mask = (mask | asoc->peer.auth_capable);
4913         info->sctpi_peer_capable = mask;
4914         mask = asoc->peer.sack_needed << 1;
4915         mask = (mask | asoc->peer.sack_generation) << 1;
4916         mask = (mask | asoc->peer.zero_window_announced);
4917         info->sctpi_peer_sack = mask;
4918 
4919         info->sctpi_isacks = asoc->stats.isacks;
4920         info->sctpi_osacks = asoc->stats.osacks;
4921         info->sctpi_opackets = asoc->stats.opackets;
4922         info->sctpi_ipackets = asoc->stats.ipackets;
4923         info->sctpi_rtxchunks = asoc->stats.rtxchunks;
4924         info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
4925         info->sctpi_idupchunks = asoc->stats.idupchunks;
4926         info->sctpi_gapcnt = asoc->stats.gapcnt;
4927         info->sctpi_ouodchunks = asoc->stats.ouodchunks;
4928         info->sctpi_iuodchunks = asoc->stats.iuodchunks;
4929         info->sctpi_oodchunks = asoc->stats.oodchunks;
4930         info->sctpi_iodchunks = asoc->stats.iodchunks;
4931         info->sctpi_octrlchunks = asoc->stats.octrlchunks;
4932         info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
4933 
4934         prim = asoc->peer.primary_path;
4935         memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4936         info->sctpi_p_state = prim->state;
4937         info->sctpi_p_cwnd = prim->cwnd;
4938         info->sctpi_p_srtt = prim->srtt;
4939         info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
4940         info->sctpi_p_hbinterval = prim->hbinterval;
4941         info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
4942         info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
4943         info->sctpi_p_ssthresh = prim->ssthresh;
4944         info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
4945         info->sctpi_p_flight_size = prim->flight_size;
4946         info->sctpi_p_error = prim->error_count;
4947 
4948         return 0;
4949 }
4950 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
4951 
4952 /* use callback to avoid exporting the core structure */
4953 void sctp_transport_walk_start(struct rhashtable_iter *iter)
4954 {
4955         rhltable_walk_enter(&sctp_transport_hashtable, iter);
4956 
4957         rhashtable_walk_start(iter);
4958 }
4959 
4960 void sctp_transport_walk_stop(struct rhashtable_iter *iter)
4961 {
4962         rhashtable_walk_stop(iter);
4963         rhashtable_walk_exit(iter);
4964 }
4965 
4966 struct sctp_transport *sctp_transport_get_next(struct net *net,
4967                                                struct rhashtable_iter *iter)
4968 {
4969         struct sctp_transport *t;
4970 
4971         t = rhashtable_walk_next(iter);
4972         for (; t; t = rhashtable_walk_next(iter)) {
4973                 if (IS_ERR(t)) {
4974                         if (PTR_ERR(t) == -EAGAIN)
4975                                 continue;
4976                         break;
4977                 }
4978 
4979                 if (!sctp_transport_hold(t))
4980                         continue;
4981 
4982                 if (net_eq(sock_net(t->asoc->base.sk), net) &&
4983                     t->asoc->peer.primary_path == t)
4984                         break;
4985 
4986                 sctp_transport_put(t);
4987         }
4988 
4989         return t;
4990 }
4991 
4992 struct sctp_transport *sctp_transport_get_idx(struct net *net,
4993                                               struct rhashtable_iter *iter,
4994                                               int pos)
4995 {
4996         struct sctp_transport *t;
4997 
4998         if (!pos)
4999                 return SEQ_START_TOKEN;
5000 
5001         while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5002                 if (!--pos)
5003                         break;
5004                 sctp_transport_put(t);
5005         }
5006 
5007         return t;
5008 }
5009 
5010 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5011                            void *p) {
5012         int err = 0;
5013         int hash = 0;
5014         struct sctp_ep_common *epb;
5015         struct sctp_hashbucket *head;
5016 
5017         for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5018              hash++, head++) {
5019                 read_lock_bh(&head->lock);
5020                 sctp_for_each_hentry(epb, &head->chain) {
5021                         err = cb(sctp_ep(epb), p);
5022                         if (err)
5023                                 break;
5024                 }
5025                 read_unlock_bh(&head->lock);
5026         }
5027 
5028         return err;
5029 }
5030 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5031 
5032 int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
5033                                   struct net *net,
5034                                   const union sctp_addr *laddr,
5035                                   const union sctp_addr *paddr, void *p)
5036 {
5037         struct sctp_transport *transport;
5038         int err;
5039 
5040         rcu_read_lock();
5041         transport = sctp_addrs_lookup_transport(net, laddr, paddr);
5042         rcu_read_unlock();
5043         if (!transport)
5044                 return -ENOENT;
5045 
5046         err = cb(transport, p);
5047         sctp_transport_put(transport);
5048 
5049         return err;
5050 }
5051 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5052 
5053 int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
5054                             int (*cb_done)(struct sctp_transport *, void *),
5055                             struct net *net, int *pos, void *p) {
5056         struct rhashtable_iter hti;
5057         struct sctp_transport *tsp;
5058         int ret;
5059 
5060 again:
5061         ret = 0;
5062         sctp_transport_walk_start(&hti);
5063 
5064         tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5065         for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5066                 ret = cb(tsp, p);
5067                 if (ret)
5068                         break;
5069                 (*pos)++;
5070                 sctp_transport_put(tsp);
5071         }
5072         sctp_transport_walk_stop(&hti);
5073 
5074         if (ret) {
5075                 if (cb_done && !cb_done(tsp, p)) {
5076                         (*pos)++;
5077                         sctp_transport_put(tsp);
5078                         goto again;
5079                 }
5080                 sctp_transport_put(tsp);
5081         }
5082 
5083         return ret;
5084 }
5085 EXPORT_SYMBOL_GPL(sctp_for_each_transport);
5086 
5087 /* 7.2.1 Association Status (SCTP_STATUS)
5088 
5089  * Applications can retrieve current status information about an
5090  * association, including association state, peer receiver window size,
5091  * number of unacked data chunks, and number of data chunks pending
5092  * receipt.  This information is read-only.
5093  */
5094 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5095                                        char __user *optval,
5096                                        int __user *optlen)
5097 {
5098         struct sctp_status status;
5099         struct sctp_association *asoc = NULL;
5100         struct sctp_transport *transport;
5101         sctp_assoc_t associd;
5102         int retval = 0;
5103 
5104         if (len < sizeof(status)) {
5105                 retval = -EINVAL;
5106                 goto out;
5107         }
5108 
5109         len = sizeof(status);
5110         if (copy_from_user(&status, optval, len)) {
5111                 retval = -EFAULT;
5112                 goto out;
5113         }
5114 
5115         associd = status.sstat_assoc_id;
5116         asoc = sctp_id2assoc(sk, associd);
5117         if (!asoc) {
5118                 retval = -EINVAL;
5119                 goto out;
5120         }
5121 
5122         transport = asoc->peer.primary_path;
5123 
5124         status.sstat_assoc_id = sctp_assoc2id(asoc);
5125         status.sstat_state = sctp_assoc_to_state(asoc);
5126         status.sstat_rwnd =  asoc->peer.rwnd;
5127         status.sstat_unackdata = asoc->unack_data;
5128 
5129         status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5130         status.sstat_instrms = asoc->stream.incnt;
5131         status.sstat_outstrms = asoc->stream.outcnt;
5132         status.sstat_fragmentation_point = asoc->frag_point;
5133         status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5134         memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5135                         transport->af_specific->sockaddr_len);
5136         /* Map ipv4 address into v4-mapped-on-v6 address.  */
5137         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5138                 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5139         status.sstat_primary.spinfo_state = transport->state;
5140         status.sstat_primary.spinfo_cwnd = transport->cwnd;
5141         status.sstat_primary.spinfo_srtt = transport->srtt;
5142         status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5143         status.sstat_primary.spinfo_mtu = transport->pathmtu;
5144 
5145         if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5146                 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5147 
5148         if (put_user(len, optlen)) {
5149                 retval = -EFAULT;
5150                 goto out;
5151         }
5152 
5153         pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5154                  __func__, len, status.sstat_state, status.sstat_rwnd,
5155                  status.sstat_assoc_id);
5156 
5157         if (copy_to_user(optval, &status, len)) {
5158                 retval = -EFAULT;
5159                 goto out;
5160         }
5161 
5162 out:
5163         return retval;
5164 }
5165 
5166 
5167 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5168  *
5169  * Applications can retrieve information about a specific peer address
5170  * of an association, including its reachability state, congestion
5171  * window, and retransmission timer values.  This information is
5172  * read-only.
5173  */
5174 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5175                                           char __user *optval,
5176                                           int __user *optlen)
5177 {
5178         struct sctp_paddrinfo pinfo;
5179         struct sctp_transport *transport;
5180         int retval = 0;
5181 
5182         if (len < sizeof(pinfo)) {
5183                 retval = -EINVAL;
5184                 goto out;
5185         }
5186 
5187         len = sizeof(pinfo);
5188         if (copy_from_user(&pinfo, optval, len)) {
5189                 retval = -EFAULT;
5190                 goto out;
5191         }
5192 
5193         transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5194                                            pinfo.spinfo_assoc_id);
5195         if (!transport)
5196                 return -EINVAL;
5197 
5198         pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5199         pinfo.spinfo_state = transport->state;
5200         pinfo.spinfo_cwnd = transport->cwnd;
5201         pinfo.spinfo_srtt = transport->srtt;
5202         pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5203         pinfo.spinfo_mtu = transport->pathmtu;
5204 
5205         if (pinfo.spinfo_state == SCTP_UNKNOWN)
5206                 pinfo.spinfo_state = SCTP_ACTIVE;
5207 
5208         if (put_user(len, optlen)) {
5209                 retval = -EFAULT;
5210                 goto out;
5211         }
5212 
5213         if (copy_to_user(optval, &pinfo, len)) {
5214                 retval = -EFAULT;
5215                 goto out;
5216         }
5217 
5218 out:
5219         return retval;
5220 }
5221 
5222 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5223  *
5224  * This option is a on/off flag.  If enabled no SCTP message
5225  * fragmentation will be performed.  Instead if a message being sent
5226  * exceeds the current PMTU size, the message will NOT be sent and
5227  * instead a error will be indicated to the user.
5228  */
5229 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5230                                         char __user *optval, int __user *optlen)
5231 {
5232         int val;
5233 
5234         if (len < sizeof(int))
5235                 return -EINVAL;
5236 
5237         len = sizeof(int);
5238         val = (sctp_sk(sk)->disable_fragments == 1);
5239         if (put_user(len, optlen))
5240                 return -EFAULT;
5241         if (copy_to_user(optval, &val, len))
5242                 return -EFAULT;
5243         return 0;
5244 }
5245 
5246 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5247  *
5248  * This socket option is used to specify various notifications and
5249  * ancillary data the user wishes to receive.
5250  */
5251 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5252                                   int __user *optlen)
5253 {
5254         if (len == 0)
5255                 return -EINVAL;
5256         if (len > sizeof(struct sctp_event_subscribe))
5257                 len = sizeof(struct sctp_event_subscribe);
5258         if (put_user(len, optlen))
5259                 return -EFAULT;
5260         if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
5261                 return -EFAULT;
5262         return 0;
5263 }
5264 
5265 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5266  *
5267  * This socket option is applicable to the UDP-style socket only.  When
5268  * set it will cause associations that are idle for more than the
5269  * specified number of seconds to automatically close.  An association
5270  * being idle is defined an association that has NOT sent or received
5271  * user data.  The special value of '' indicates that no automatic
5272  * close of any associations should be performed.  The option expects an
5273  * integer defining the number of seconds of idle time before an
5274  * association is closed.
5275  */
5276 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5277 {
5278         /* Applicable to UDP-style socket only */
5279         if (sctp_style(sk, TCP))
5280                 return -EOPNOTSUPP;
5281         if (len < sizeof(int))
5282                 return -EINVAL;
5283         len = sizeof(int);
5284         if (put_user(len, optlen))
5285                 return -EFAULT;
5286         if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5287                 return -EFAULT;
5288         return 0;
5289 }
5290 
5291 /* Helper routine to branch off an association to a new socket.  */
5292 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5293 {
5294         struct sctp_association *asoc = sctp_id2assoc(sk, id);
5295         struct sctp_sock *sp = sctp_sk(sk);
5296         struct socket *sock;
5297         int err = 0;
5298 
5299         /* Do not peel off from one netns to another one. */
5300         if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5301                 return -EINVAL;
5302 
5303         if (!asoc)
5304                 return -EINVAL;
5305 
5306         /* An association cannot be branched off from an already peeled-off
5307          * socket, nor is this supported for tcp style sockets.
5308          */
5309         if (!sctp_style(sk, UDP))
5310                 return -EINVAL;
5311 
5312         /* Create a new socket.  */
5313         err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5314         if (err < 0)
5315                 return err;
5316 
5317         sctp_copy_sock(sock->sk, sk, asoc);
5318 
5319         /* Make peeled-off sockets more like 1-1 accepted sockets.
5320          * Set the daddr and initialize id to something more random and also
5321          * copy over any ip options.
5322          */
5323         sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5324         sp->pf->copy_ip_options(sk, sock->sk);
5325 
5326         /* Populate the fields of the newsk from the oldsk and migrate the
5327          * asoc to the newsk.
5328          */
5329         sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5330 
5331         *sockp = sock;
5332 
5333         return err;
5334 }
5335 EXPORT_SYMBOL(sctp_do_peeloff);
5336 
5337 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5338                                           struct file **newfile, unsigned flags)
5339 {
5340         struct socket *newsock;
5341         int retval;
5342 
5343         retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5344         if (retval < 0)
5345                 goto out;
5346 
5347         /* Map the socket to an unused fd that can be returned to the user.  */
5348         retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5349         if (retval < 0) {
5350                 sock_release(newsock);
5351                 goto out;
5352         }
5353 
5354         *newfile = sock_alloc_file(newsock, 0, NULL);
5355         if (IS_ERR(*newfile)) {
5356                 put_unused_fd(retval);
5357                 retval = PTR_ERR(*newfile);
5358                 *newfile = NULL;
5359                 return retval;
5360         }
5361 
5362         pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5363                  retval);
5364 
5365         peeloff->sd = retval;
5366 
5367         if (flags & SOCK_NONBLOCK)
5368                 (*newfile)->f_flags |= O_NONBLOCK;
5369 out:
5370         return retval;
5371 }
5372 
5373 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5374 {
5375         sctp_peeloff_arg_t peeloff;
5376         struct file *newfile = NULL;
5377         int retval = 0;
5378 
5379         if (len < sizeof(sctp_peeloff_arg_t))
5380                 return -EINVAL;
5381         len = sizeof(sctp_peeloff_arg_t);
5382         if (copy_from_user(&peeloff, optval, len))
5383                 return -EFAULT;
5384 
5385         retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5386         if (retval < 0)
5387                 goto out;
5388 
5389         /* Return the fd mapped to the new socket.  */
5390         if (put_user(len, optlen)) {
5391                 fput(newfile);
5392                 put_unused_fd(retval);
5393                 return -EFAULT;
5394         }
5395 
5396         if (copy_to_user(optval, &peeloff, len)) {
5397                 fput(newfile);
5398                 put_unused_fd(retval);
5399                 return -EFAULT;
5400         }
5401         fd_install(retval, newfile);
5402 out:
5403         return retval;
5404 }
5405 
5406 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5407                                          char __user *optval, int __user *optlen)
5408 {
5409         sctp_peeloff_flags_arg_t peeloff;
5410         struct file *newfile = NULL;
5411         int retval = 0;
5412 
5413         if (len < sizeof(sctp_peeloff_flags_arg_t))
5414                 return -EINVAL;
5415         len = sizeof(sctp_peeloff_flags_arg_t);
5416         if (copy_from_user(&peeloff, optval, len))
5417                 return -EFAULT;
5418 
5419         retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5420                                                 &newfile, peeloff.flags);
5421         if (retval < 0)
5422                 goto out;
5423 
5424         /* Return the fd mapped to the new socket.  */
5425         if (put_user(len, optlen)) {
5426                 fput(newfile);
5427                 put_unused_fd(retval);
5428                 return -EFAULT;
5429         }
5430 
5431         if (copy_to_user(optval, &peeloff, len)) {
5432                 fput(newfile);
5433                 put_unused_fd(retval);
5434                 return -EFAULT;
5435         }
5436         fd_install(retval, newfile);
5437 out:
5438         return retval;
5439 }
5440 
5441 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5442  *
5443  * Applications can enable or disable heartbeats for any peer address of
5444  * an association, modify an address's heartbeat interval, force a
5445  * heartbeat to be sent immediately, and adjust the address's maximum
5446  * number of retransmissions sent before an address is considered
5447  * unreachable.  The following structure is used to access and modify an
5448  * address's parameters:
5449  *
5450  *  struct sctp_paddrparams {
5451  *     sctp_assoc_t            spp_assoc_id;
5452  *     struct sockaddr_storage spp_address;
5453  *     uint32_t                spp_hbinterval;
5454  *     uint16_t                spp_pathmaxrxt;
5455  *     uint32_t                spp_pathmtu;
5456  *     uint32_t                spp_sackdelay;
5457  *     uint32_t                spp_flags;
5458  * };
5459  *
5460  *   spp_assoc_id    - (one-to-many style socket) This is filled in the
5461  *                     application, and identifies the association for
5462  *                     this query.
5463  *   spp_address     - This specifies which address is of interest.
5464  *   spp_hbinterval  - This contains the value of the heartbeat interval,
5465  *                     in milliseconds.  If a  value of zero
5466  *                     is present in this field then no changes are to
5467  *                     be made to this parameter.
5468  *   spp_pathmaxrxt  - This contains the maximum number of
5469  *                     retransmissions before this address shall be
5470  *                     considered unreachable. If a  value of zero
5471  *                     is present in this field then no changes are to
5472  *                     be made to this parameter.
5473  *   spp_pathmtu     - When Path MTU discovery is disabled the value
5474  *                     specified here will be the "fixed" path mtu.
5475  *                     Note that if the spp_address field is empty
5476  *                     then all associations on this address will
5477  *                     have this fixed path mtu set upon them.
5478  *
5479  *   spp_sackdelay   - When delayed sack is enabled, this value specifies
5480  *                     the number of milliseconds that sacks will be delayed
5481  *                     for. This value will apply to all addresses of an
5482  *                     association if the spp_address field is empty. Note
5483  *                     also, that if delayed sack is enabled and this
5484  *                     value is set to 0, no change is made to the last
5485  *                     recorded delayed sack timer value.
5486  *
5487  *   spp_flags       - These flags are used to control various features
5488  *                     on an association. The flag field may contain
5489  *                     zero or more of the following options.
5490  *
5491  *                     SPP_HB_ENABLE  - Enable heartbeats on the
5492  *                     specified address. Note that if the address
5493  *                     field is empty all addresses for the association
5494  *                     have heartbeats enabled upon them.
5495  *
5496  *                     SPP_HB_DISABLE - Disable heartbeats on the
5497  *                     speicifed address. Note that if the address
5498  *                     field is empty all addresses for the association
5499  *                     will have their heartbeats disabled. Note also
5500  *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
5501  *                     mutually exclusive, only one of these two should
5502  *                     be specified. Enabling both fields will have
5503  *                     undetermined results.
5504  *
5505  *                     SPP_HB_DEMAND - Request a user initiated heartbeat
5506  *                     to be made immediately.
5507  *
5508  *                     SPP_PMTUD_ENABLE - This field will enable PMTU
5509  *                     discovery upon the specified address. Note that
5510  *                     if the address feild is empty then all addresses
5511  *                     on the association are effected.
5512  *
5513  *                     SPP_PMTUD_DISABLE - This field will disable PMTU
5514  *                     discovery upon the specified address. Note that
5515  *                     if the address feild is empty then all addresses
5516  *                     on the association are effected. Not also that
5517  *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5518  *                     exclusive. Enabling both will have undetermined
5519  *                     results.
5520  *
5521  *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
5522  *                     on delayed sack. The time specified in spp_sackdelay
5523  *                     is used to specify the sack delay for this address. Note
5524  *                     that if spp_address is empty then all addresses will
5525  *                     enable delayed sack and take on the sack delay
5526  *                     value specified in spp_sackdelay.
5527  *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
5528  *                     off delayed sack. If the spp_address field is blank then
5529  *                     delayed sack is disabled for the entire association. Note
5530  *                     also that this field is mutually exclusive to
5531  *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
5532  *                     results.
5533  *
5534  *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
5535  *                     setting of the IPV6 flow label value.  The value is
5536  *                     contained in the spp_ipv6_flowlabel field.
5537  *                     Upon retrieval, this flag will be set to indicate that
5538  *                     the spp_ipv6_flowlabel field has a valid value returned.
5539  *                     If a specific destination address is set (in the
5540  *                     spp_address field), then the value returned is that of
5541  *                     the address.  If just an association is specified (and
5542  *                     no address), then the association's default flow label
5543  *                     is returned.  If neither an association nor a destination
5544  *                     is specified, then the socket's default flow label is
5545  *                     returned.  For non-IPv6 sockets, this flag will be left
5546  *                     cleared.
5547  *
5548  *                     SPP_DSCP:  Setting this flag enables the setting of the
5549  *                     Differentiated Services Code Point (DSCP) value
5550  *                     associated with either the association or a specific
5551  *                     address.  The value is obtained in the spp_dscp field.
5552  *                     Upon retrieval, this flag will be set to indicate that
5553  *                     the spp_dscp field has a valid value returned.  If a
5554  *                     specific destination address is set when called (in the
5555  *                     spp_address field), then that specific destination
5556  *                     address's DSCP value is returned.  If just an association
5557  *                     is specified, then the association's default DSCP is
5558  *                     returned.  If neither an association nor a destination is
5559  *                     specified, then the socket's default DSCP is returned.
5560  *
5561  *   spp_ipv6_flowlabel
5562  *                   - This field is used in conjunction with the
5563  *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5564  *                     The 20 least significant bits are used for the flow
5565  *                     label.  This setting has precedence over any IPv6-layer
5566  *                     setting.
5567  *
5568  *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
5569  *                     and contains the DSCP.  The 6 most significant bits are
5570  *                     used for the DSCP.  This setting has precedence over any
5571  *                     IPv4- or IPv6- layer setting.
5572  */
5573 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5574                                             char __user *optval, int __user *optlen)
5575 {
5576         struct sctp_paddrparams  params;
5577         struct sctp_transport   *trans = NULL;
5578         struct sctp_association *asoc = NULL;
5579         struct sctp_sock        *sp = sctp_sk(sk);
5580 
5581         if (len >= sizeof(params))
5582                 len = sizeof(params);
5583         else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5584                                        spp_ipv6_flowlabel), 4))
5585                 len = ALIGN(offsetof(struct sctp_paddrparams,
5586                                      spp_ipv6_flowlabel), 4);
5587         else
5588                 return -EINVAL;
5589 
5590         if (copy_from_user(&params, optval, len))
5591                 return -EFAULT;
5592 
5593         /* If an address other than INADDR_ANY is specified, and
5594          * no transport is found, then the request is invalid.
5595          */
5596         if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5597                 trans = sctp_addr_id2transport(sk, &params.spp_address,
5598                                                params.spp_assoc_id);
5599                 if (!trans) {
5600                         pr_debug("%s: failed no transport\n", __func__);
5601                         return -EINVAL;
5602                 }
5603         }
5604 
5605         /* Get association, if assoc_id != 0 and the socket is a one
5606          * to many style socket, and an association was not found, then
5607          * the id was invalid.
5608          */
5609         asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5610         if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5611                 pr_debug("%s: failed no association\n", __func__);
5612                 return -EINVAL;
5613         }
5614 
5615         if (trans) {
5616                 /* Fetch transport values. */
5617                 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5618                 params.spp_pathmtu    = trans->pathmtu;
5619                 params.spp_pathmaxrxt = trans->pathmaxrxt;
5620                 params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
5621 
5622                 /*draft-11 doesn't say what to return in spp_flags*/
5623                 params.spp_flags      = trans->param_flags;
5624                 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5625                         params.spp_ipv6_flowlabel = trans->flowlabel &
5626                                                     SCTP_FLOWLABEL_VAL_MASK;
5627                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
5628                 }
5629                 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5630                         params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5631                         params.spp_flags |= SPP_DSCP;
5632                 }
5633         } else if (asoc) {
5634                 /* Fetch association values. */
5635                 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5636                 params.spp_pathmtu    = asoc->pathmtu;
5637                 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5638                 params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
5639 
5640                 /*draft-11 doesn't say what to return in spp_flags*/
5641                 params.spp_flags      = asoc->param_flags;
5642                 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5643                         params.spp_ipv6_flowlabel = asoc->flowlabel &
5644                                                     SCTP_FLOWLABEL_VAL_MASK;
5645                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
5646                 }
5647                 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5648                         params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5649                         params.spp_flags |= SPP_DSCP;
5650                 }
5651         } else {
5652                 /* Fetch socket values. */
5653                 params.spp_hbinterval = sp->hbinterval;
5654                 params.spp_pathmtu    = sp->pathmtu;
5655                 params.spp_sackdelay  = sp->sackdelay;
5656                 params.spp_pathmaxrxt = sp->pathmaxrxt;
5657 
5658                 /*draft-11 doesn't say what to return in spp_flags*/
5659                 params.spp_flags      = sp->param_flags;
5660                 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5661                         params.spp_ipv6_flowlabel = sp->flowlabel &
5662                                                     SCTP_FLOWLABEL_VAL_MASK;
5663                         params.spp_flags |= SPP_IPV6_FLOWLABEL;
5664                 }
5665                 if (sp->dscp & SCTP_DSCP_SET_MASK) {
5666                         params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
5667                         params.spp_flags |= SPP_DSCP;
5668                 }
5669         }
5670 
5671         if (copy_to_user(optval, &params, len))
5672                 return -EFAULT;
5673 
5674         if (put_user(len, optlen))
5675                 return -EFAULT;
5676 
5677         return 0;
5678 }
5679 
5680 /*
5681  * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
5682  *
5683  * This option will effect the way delayed acks are performed.  This
5684  * option allows you to get or set the delayed ack time, in
5685  * milliseconds.  It also allows changing the delayed ack frequency.
5686  * Changing the frequency to 1 disables the delayed sack algorithm.  If
5687  * the assoc_id is 0, then this sets or gets the endpoints default
5688  * values.  If the assoc_id field is non-zero, then the set or get
5689  * effects the specified association for the one to many model (the
5690  * assoc_id field is ignored by the one to one model).  Note that if
5691  * sack_delay or sack_freq are 0 when setting this option, then the
5692  * current values will remain unchanged.
5693  *
5694  * struct sctp_sack_info {
5695  *     sctp_assoc_t            sack_assoc_id;
5696  *     uint32_t                sack_delay;
5697  *     uint32_t                sack_freq;
5698  * };
5699  *
5700  * sack_assoc_id -  This parameter, indicates which association the user
5701  *    is performing an action upon.  Note that if this field's value is
5702  *    zero then the endpoints default value is changed (effecting future
5703  *    associations only).
5704  *
5705  * sack_delay -  This parameter contains the number of milliseconds that
5706  *    the user is requesting the delayed ACK timer be set to.  Note that
5707  *    this value is defined in the standard to be between 200 and 500
5708  *    milliseconds.
5709  *
5710  * sack_freq -  This parameter contains the number of packets that must
5711  *    be received before a sack is sent without waiting for the delay
5712  *    timer to expire.  The default value for this is 2, setting this
5713  *    value to 1 will disable the delayed sack algorithm.
5714  */
5715 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5716                                             char __user *optval,
5717                                             int __user *optlen)
5718 {
5719         struct sctp_sack_info    params;
5720         struct sctp_association *asoc = NULL;
5721         struct sctp_sock        *sp = sctp_sk(sk);
5722 
5723         if (len >= sizeof(struct sctp_sack_info)) {
5724                 len = sizeof(struct sctp_sack_info);
5725 
5726                 if (copy_from_user(&params, optval, len))
5727                         return -EFAULT;
5728         } else if (len == sizeof(struct sctp_assoc_value)) {
5729                 pr_warn_ratelimited(DEPRECATED
5730                                     "%s (pid %d) "
5731                                     "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5732                                     "Use struct sctp_sack_info instead\n",
5733                                     current->comm, task_pid_nr(current));
5734                 if (copy_from_user(&params, optval, len))
5735                         return -EFAULT;
5736         } else
5737                 return -EINVAL;
5738 
5739         /* Get association, if sack_assoc_id != 0 and the socket is a one
5740          * to many style socket, and an association was not found, then
5741          * the id was invalid.
5742          */
5743         asoc = sctp_id2assoc(sk, params.sack_assoc_id);
5744         if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5745                 return -EINVAL;
5746 
5747         if (asoc) {
5748                 /* Fetch association values. */
5749                 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
5750                         params.sack_delay = jiffies_to_msecs(
5751                                 asoc->sackdelay);
5752                         params.sack_freq = asoc->sackfreq;
5753 
5754                 } else {
5755                         params.sack_delay = 0;
5756                         params.sack_freq = 1;
5757                 }
5758         } else {
5759                 /* Fetch socket values. */
5760                 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
5761                         params.sack_delay  = sp->sackdelay;
5762                         params.sack_freq = sp->sackfreq;
5763                 } else {
5764                         params.sack_delay  = 0;
5765                         params.sack_freq = 1;
5766                 }
5767         }
5768 
5769         if (copy_to_user(optval, &params, len))
5770                 return -EFAULT;
5771 
5772         if (put_user(len, optlen))
5773                 return -EFAULT;
5774 
5775         return 0;
5776 }
5777 
5778 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
5779  *
5780  * Applications can specify protocol parameters for the default association
5781  * initialization.  The option name argument to setsockopt() and getsockopt()
5782  * is SCTP_INITMSG.
5783  *
5784  * Setting initialization parameters is effective only on an unconnected
5785  * socket (for UDP-style sockets only future associations are effected
5786  * by the change).  With TCP-style sockets, this option is inherited by
5787  * sockets derived from a listener socket.
5788  */
5789 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
5790 {
5791         if (len < sizeof(struct sctp_initmsg))
5792                 return -EINVAL;
5793         len = sizeof(struct sctp_initmsg);
5794         if (put_user(len, optlen))
5795                 return -EFAULT;
5796         if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
5797                 return -EFAULT;
5798         return 0;
5799 }
5800 
5801 
5802 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
5803                                       char __user *optval, int __user *optlen)
5804 {
5805         struct sctp_association *asoc;
5806         int cnt = 0;
5807         struct sctp_getaddrs getaddrs;
5808         struct sctp_transport *from;
5809         void __user *to;
5810         union sctp_addr temp;
5811         struct sctp_sock *sp = sctp_sk(sk);
5812         int addrlen;
5813         size_t space_left;
5814         int bytes_copied;
5815 
5816         if (len < sizeof(struct sctp_getaddrs))
5817                 return -EINVAL;
5818 
5819         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5820                 return -EFAULT;
5821 
5822         /* For UDP-style sockets, id specifies the association to query.  */
5823         asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5824         if (!asoc)
5825                 return -EINVAL;
5826 
5827         to = optval + offsetof(struct sctp_getaddrs, addrs);
5828         space_left = len - offsetof(struct sctp_getaddrs, addrs);
5829 
5830         list_for_each_entry(from, &asoc->peer.transport_addr_list,
5831                                 transports) {
5832                 memcpy(&temp, &from->ipaddr, sizeof(temp));
5833                 addrlen = sctp_get_pf_specific(sk->sk_family)
5834                               ->addr_to_user(sp, &temp);
5835                 if (space_left < addrlen)
5836                         return -ENOMEM;
5837                 if (copy_to_user(to, &temp, addrlen))
5838                         return -EFAULT;
5839                 to += addrlen;
5840                 cnt++;
5841                 space_left -= addrlen;
5842         }
5843 
5844         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
5845                 return -EFAULT;
5846         bytes_copied = ((char __user *)to) - optval;
5847         if (put_user(bytes_copied, optlen))
5848                 return -EFAULT;
5849 
5850         return 0;
5851 }
5852 
5853 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
5854                             size_t space_left, int *bytes_copied)
5855 {
5856         struct sctp_sockaddr_entry *addr;
5857         union sctp_addr temp;
5858         int cnt = 0;
5859         int addrlen;
5860         struct net *net = sock_net(sk);
5861 
5862         rcu_read_lock();
5863         list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5864                 if (!addr->valid)
5865                         continue;
5866 
5867                 if ((PF_INET == sk->sk_family) &&
5868                     (AF_INET6 == addr->a.sa.sa_family))
5869                         continue;
5870                 if ((PF_INET6 == sk->sk_family) &&
5871                     inet_v6_ipv6only(sk) &&
5872                     (AF_INET == addr->a.sa.sa_family))
5873                         continue;
5874                 memcpy(&temp, &addr->a, sizeof(temp));
5875                 if (!temp.v4.sin_port)
5876                         temp.v4.sin_port = htons(port);
5877 
5878                 addrlen = sctp_get_pf_specific(sk->sk_family)
5879                               ->addr_to_user(sctp_sk(sk), &temp);
5880 
5881                 if (space_left < addrlen) {
5882                         cnt =  -ENOMEM;
5883                         break;
5884                 }
5885                 memcpy(to, &temp, addrlen);
5886 
5887                 to += addrlen;
5888                 cnt++;
5889                 space_left -= addrlen;
5890                 *bytes_copied += addrlen;
5891         }
5892         rcu_read_unlock();
5893 
5894         return cnt;
5895 }
5896 
5897 
5898 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
5899                                        char __user *optval, int __user *optlen)
5900 {
5901         struct sctp_bind_addr *bp;
5902         struct sctp_association *asoc;
5903         int cnt = 0;
5904         struct sctp_getaddrs getaddrs;
5905         struct sctp_sockaddr_entry *addr;
5906         void __user *to;
5907         union sctp_addr temp;
5908         struct sctp_sock *sp = sctp_sk(sk);
5909         int addrlen;
5910         int err = 0;
5911         size_t space_left;
5912         int bytes_copied = 0;
5913         void *addrs;
5914         void *buf;
5915 
5916         if (len < sizeof(struct sctp_getaddrs))
5917                 return -EINVAL;
5918 
5919         if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
5920                 return -EFAULT;
5921 
5922         /*
5923          *  For UDP-style sockets, id specifies the association to query.
5924          *  If the id field is set to the value '' then the locally bound
5925          *  addresses are returned without regard to any particular
5926          *  association.
5927          */
5928         if (0 == getaddrs.assoc_id) {
5929                 bp = &sctp_sk(sk)->ep->base.bind_addr;
5930         } else {
5931                 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
5932                 if (!asoc)
5933                         return -EINVAL;
5934                 bp = &asoc->base.bind_addr;
5935         }
5936 
5937         to = optval + offsetof(struct sctp_getaddrs, addrs);
5938         space_left = len - offsetof(struct sctp_getaddrs, addrs);
5939 
5940         addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5941         if (!addrs)
5942                 return -ENOMEM;
5943 
5944         /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
5945          * addresses from the global local address list.
5946          */
5947         if (sctp_list_single_entry(&bp->address_list)) {
5948                 addr = list_entry(bp->address_list.next,
5949                                   struct sctp_sockaddr_entry, list);
5950                 if (sctp_is_any(sk, &addr->a)) {
5951                         cnt = sctp_copy_laddrs(sk, bp->port, addrs,
5952                                                 space_left, &bytes_copied);
5953                         if (cnt < 0) {
5954                                 err = cnt;
5955                                 goto out;
5956                         }
5957                         goto copy_getaddrs;
5958                 }
5959         }
5960 
5961         buf = addrs;
5962         /* Protection on the bound address list is not needed since
5963          * in the socket option context we hold a socket lock and
5964          * thus the bound address list can't change.
5965          */
5966         list_for_each_entry(addr, &bp->address_list, list) {
5967                 memcpy(&temp, &addr->a, sizeof(temp));
5968                 addrlen = sctp_get_pf_specific(sk->sk_family)
5969                               ->addr_to_user(sp, &temp);
5970                 if (space_left < addrlen) {
5971                         err =  -ENOMEM; /*fixme: right error?*/
5972                         goto out;
5973                 }
5974                 memcpy(buf, &temp, addrlen);
5975                 buf += addrlen;
5976                 bytes_copied += addrlen;
5977                 cnt++;
5978                 space_left -= addrlen;
5979         }
5980 
5981 copy_getaddrs:
5982         if (copy_to_user(to, addrs, bytes_copied)) {
5983                 err = -EFAULT;
5984                 goto out;
5985         }
5986         if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
5987                 err = -EFAULT;
5988                 goto out;
5989         }
5990         /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
5991          * but we can't change it anymore.
5992          */
5993         if (put_user(bytes_copied, optlen))
5994                 err = -EFAULT;
5995 out:
5996         kfree(addrs);
5997         return err;
5998 }
5999 
6000 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6001  *
6002  * Requests that the local SCTP stack use the enclosed peer address as
6003  * the association primary.  The enclosed address must be one of the
6004  * association peer's addresses.
6005  */
6006 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6007                                         char __user *optval, int __user *optlen)
6008 {
6009         struct sctp_prim prim;
6010         struct sctp_association *asoc;
6011         struct sctp_sock *sp = sctp_sk(sk);
6012 
6013         if (len < sizeof(struct sctp_prim))
6014                 return -EINVAL;
6015 
6016         len = sizeof(struct sctp_prim);
6017 
6018         if (copy_from_user(&prim, optval, len))
6019                 return -EFAULT;
6020 
6021         asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6022         if (!asoc)
6023                 return -EINVAL;
6024 
6025         if (!asoc->peer.primary_path)
6026                 return -ENOTCONN;
6027 
6028         memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6029                 asoc->peer.primary_path->af_specific->sockaddr_len);
6030 
6031         sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6032                         (union sctp_addr *)&prim.ssp_addr);
6033 
6034         if (put_user(len, optlen))
6035                 return -EFAULT;
6036         if (copy_to_user(optval, &prim, len))
6037                 return -EFAULT;
6038 
6039         return 0;
6040 }
6041 
6042 /*
6043  * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6044  *
6045  * Requests that the local endpoint set the specified Adaptation Layer
6046  * Indication parameter for all future INIT and INIT-ACK exchanges.
6047  */
6048 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6049                                   char __user *optval, int __user *optlen)
6050 {
6051         struct sctp_setadaptation adaptation;
6052 
6053         if (len < sizeof(struct sctp_setadaptation))
6054                 return -EINVAL;
6055 
6056         len = sizeof(struct sctp_setadaptation);
6057 
6058         adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6059 
6060         if (put_user(len, optlen))
6061                 return -EFAULT;
6062         if (copy_to_user(optval, &adaptation, len))
6063                 return -EFAULT;
6064 
6065         return 0;
6066 }
6067 
6068 /*
6069  *
6070  * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6071  *
6072  *   Applications that wish to use the sendto() system call may wish to
6073  *   specify a default set of parameters that would normally be supplied
6074  *   through the inclusion of ancillary data.  This socket option allows
6075  *   such an application to set the default sctp_sndrcvinfo structure.
6076 
6077 
6078  *   The application that wishes to use this socket option simply passes
6079  *   in to this call the sctp_sndrcvinfo structure defined in Section
6080  *   5.2.2) The input parameters accepted by this call include
6081  *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6082  *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
6083  *   to this call if the caller is using the UDP model.
6084  *
6085  *   For getsockopt, it get the default sctp_sndrcvinfo structure.
6086  */
6087 static int sctp_getsockopt_default_send_param(struct sock *sk,
6088                                         int len, char __user *optval,
6089                                         int __user *optlen)
6090 {
6091         struct sctp_sock *sp = sctp_sk(sk);
6092         struct sctp_association *asoc;
6093         struct sctp_sndrcvinfo info;
6094 
6095         if (len < sizeof(info))
6096                 return -EINVAL;
6097 
6098         len = sizeof(info);
6099 
6100         if (copy_from_user(&info, optval, len))
6101                 return -EFAULT;
6102 
6103         asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6104         if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
6105                 return -EINVAL;
6106         if (asoc) {
6107                 info.sinfo_stream = asoc->default_stream;
6108                 info.sinfo_flags = asoc->default_flags;
6109                 info.sinfo_ppid = asoc->default_ppid;
6110                 info.sinfo_context = asoc->default_context;
6111                 info.sinfo_timetolive = asoc->default_timetolive;
6112         } else {
6113                 info.sinfo_stream = sp->default_stream;
6114                 info.sinfo_flags = sp->default_flags;
6115                 info.sinfo_ppid = sp->default_ppid;
6116                 info.sinfo_context = sp->default_context;
6117                 info.sinfo_timetolive = sp->default_timetolive;
6118         }
6119 
6120         if (put_user(len, optlen))
6121                 return -EFAULT;
6122         if (copy_to_user(optval, &info, len))
6123                 return -EFAULT;
6124 
6125         return 0;
6126 }
6127 
6128 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6129  * (SCTP_DEFAULT_SNDINFO)
6130  */
6131 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6132                                            char __user *optval,
6133                                            int __user *optlen)
6134 {
6135         struct sctp_sock *sp = sctp_sk(sk);
6136         struct sctp_association *asoc;
6137         struct sctp_sndinfo info;
6138 
6139         if (len < sizeof(info))
6140                 return -EINVAL;
6141 
6142         len = sizeof(info);
6143 
6144         if (copy_from_user(&info, optval, len))
6145                 return -EFAULT;