1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 * Copyright (c) 2001-2002 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
10 * This file is part of the SCTP kernel implementation
11 *
12 * These functions interface with the sockets layer to implement the
13 * SCTP Extensions for the Sockets API.
14 *
15 * Note that the descriptions from the specification are USER level
16 * functions--this file is the functions which populate the struct proto
17 * for SCTP which is the BOTTOM of the sockets interface.
18 *
19 * Please send any bug reports or fixes you make to the
20 * email address(es):
21 * lksctp developers <linux-sctp@vger.kernel.org>
22 *
23 * Written or modified by:
24 * La Monte H.P. Yarroll <piggy@acm.org>
25 * Narasimha Budihal <narsi@refcode.org>
26 * Karl Knutson <karl@athena.chicago.il.us>
27 * Jon Grimm <jgrimm@us.ibm.com>
28 * Xingang Guo <xingang.guo@intel.com>
29 * Daisy Chang <daisyc@us.ibm.com>
30 * Sridhar Samudrala <samudrala@us.ibm.com>
31 * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com>
32 * Ardelle Fan <ardelle.fan@intel.com>
33 * Ryan Layer <rmlayer@us.ibm.com>
34 * Anup Pemmaiah <pemmaiah@cc.usu.edu>
35 * Kevin Gao <kevin.gao@intel.com>
36 */
37
38 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39
40 #include <crypto/hash.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/wait.h>
44 #include <linux/time.h>
45 #include <linux/sched/signal.h>
46 #include <linux/ip.h>
47 #include <linux/capability.h>
48 #include <linux/fcntl.h>
49 #include <linux/poll.h>
50 #include <linux/init.h>
51 #include <linux/slab.h>
52 #include <linux/file.h>
53 #include <linux/compat.h>
54 #include <linux/rhashtable.h>
55
56 #include <net/ip.h>
57 #include <net/icmp.h>
58 #include <net/route.h>
59 #include <net/ipv6.h>
60 #include <net/inet_common.h>
61 #include <net/busy_poll.h>
62 #include <trace/events/sock.h>
63
64 #include <linux/socket.h> /* for sa_family_t */
65 #include <linux/export.h>
66 #include <net/sock.h>
67 #include <net/sctp/sctp.h>
68 #include <net/sctp/sm.h>
69 #include <net/sctp/stream_sched.h>
70 #include <net/rps.h>
71
72 /* Forward declarations for internal helper functions. */
73 static bool sctp_writeable(const struct sock *sk);
74 static void sctp_wfree(struct sk_buff *skb);
75 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
76 size_t msg_len);
77 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
78 static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
79 static int sctp_wait_for_accept(struct sock *sk, long timeo);
80 static void sctp_wait_for_close(struct sock *sk, long timeo);
81 static void sctp_destruct_sock(struct sock *sk);
82 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
83 union sctp_addr *addr, int len);
84 static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
85 static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
86 static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
87 static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
88 static int sctp_send_asconf(struct sctp_association *asoc,
89 struct sctp_chunk *chunk);
90 static int sctp_do_bind(struct sock *, union sctp_addr *, int);
91 static int sctp_autobind(struct sock *sk);
92 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
93 struct sctp_association *assoc,
94 enum sctp_socket_type type);
95
96 static unsigned long sctp_memory_pressure;
97 static atomic_long_t sctp_memory_allocated;
98 static DEFINE_PER_CPU(int, sctp_memory_per_cpu_fw_alloc);
99 struct percpu_counter sctp_sockets_allocated;
100
sctp_enter_memory_pressure(struct sock * sk)101 static void sctp_enter_memory_pressure(struct sock *sk)
102 {
103 WRITE_ONCE(sctp_memory_pressure, 1);
104 }
105
106
107 /* Get the sndbuf space available at the time on the association. */
sctp_wspace(struct sctp_association * asoc)108 static inline int sctp_wspace(struct sctp_association *asoc)
109 {
110 struct sock *sk = asoc->base.sk;
111
112 return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
113 : sk_stream_wspace(sk);
114 }
115
116 /* Increment the used sndbuf space count of the corresponding association by
117 * the size of the outgoing data chunk.
118 * Also, set the skb destructor for sndbuf accounting later.
119 *
120 * Since it is always 1-1 between chunk and skb, and also a new skb is always
121 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
122 * destructor in the data chunk skb for the purpose of the sndbuf space
123 * tracking.
124 */
sctp_set_owner_w(struct sctp_chunk * chunk)125 static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
126 {
127 struct sctp_association *asoc = chunk->asoc;
128 struct sock *sk = asoc->base.sk;
129
130 /* The sndbuf space is tracked per association. */
131 sctp_association_hold(asoc);
132
133 if (chunk->shkey)
134 sctp_auth_shkey_hold(chunk->shkey);
135
136 skb_set_owner_w(chunk->skb, sk);
137
138 chunk->skb->destructor = sctp_wfree;
139 /* Save the chunk pointer in skb for sctp_wfree to use later. */
140 skb_shinfo(chunk->skb)->destructor_arg = chunk;
141
142 refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
143 asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
144 sk_wmem_queued_add(sk, chunk->skb->truesize + sizeof(struct sctp_chunk));
145 sk_mem_charge(sk, chunk->skb->truesize);
146 }
147
sctp_clear_owner_w(struct sctp_chunk * chunk)148 static void sctp_clear_owner_w(struct sctp_chunk *chunk)
149 {
150 skb_orphan(chunk->skb);
151 }
152
153 #define traverse_and_process() \
154 do { \
155 msg = chunk->msg; \
156 if (msg == prev_msg) \
157 continue; \
158 list_for_each_entry(c, &msg->chunks, frag_list) { \
159 if ((clear && asoc->base.sk == c->skb->sk) || \
160 (!clear && asoc->base.sk != c->skb->sk)) \
161 cb(c); \
162 } \
163 prev_msg = msg; \
164 } while (0)
165
sctp_for_each_tx_datachunk(struct sctp_association * asoc,bool clear,void (* cb)(struct sctp_chunk *))166 static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
167 bool clear,
168 void (*cb)(struct sctp_chunk *))
169
170 {
171 struct sctp_datamsg *msg, *prev_msg = NULL;
172 struct sctp_outq *q = &asoc->outqueue;
173 struct sctp_chunk *chunk, *c;
174 struct sctp_transport *t;
175
176 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
177 list_for_each_entry(chunk, &t->transmitted, transmitted_list)
178 traverse_and_process();
179
180 list_for_each_entry(chunk, &q->retransmit, transmitted_list)
181 traverse_and_process();
182
183 list_for_each_entry(chunk, &q->sacked, transmitted_list)
184 traverse_and_process();
185
186 list_for_each_entry(chunk, &q->abandoned, transmitted_list)
187 traverse_and_process();
188
189 list_for_each_entry(chunk, &q->out_chunk_list, list)
190 traverse_and_process();
191 }
192
sctp_for_each_rx_skb(struct sctp_association * asoc,struct sock * sk,void (* cb)(struct sk_buff *,struct sock *))193 static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
194 void (*cb)(struct sk_buff *, struct sock *))
195
196 {
197 struct sk_buff *skb, *tmp;
198
199 sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
200 cb(skb, sk);
201
202 sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
203 cb(skb, sk);
204
205 sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
206 cb(skb, sk);
207 }
208
209 /* Verify that this is a valid address. */
sctp_verify_addr(struct sock * sk,union sctp_addr * addr,int len)210 static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
211 int len)
212 {
213 struct sctp_af *af;
214
215 /* Verify basic sockaddr. */
216 af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
217 if (!af)
218 return -EINVAL;
219
220 /* Is this a valid SCTP address? */
221 if (!af->addr_valid(addr, sctp_sk(sk), NULL))
222 return -EINVAL;
223
224 if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
225 return -EINVAL;
226
227 return 0;
228 }
229
230 /* Look up the association by its id. If this is not a UDP-style
231 * socket, the ID field is always ignored.
232 */
sctp_id2assoc(struct sock * sk,sctp_assoc_t id)233 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
234 {
235 struct sctp_association *asoc = NULL;
236
237 /* If this is not a UDP-style socket, assoc id should be ignored. */
238 if (!sctp_style(sk, UDP)) {
239 /* Return NULL if the socket state is not ESTABLISHED. It
240 * could be a TCP-style listening socket or a socket which
241 * hasn't yet called connect() to establish an association.
242 */
243 if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
244 return NULL;
245
246 /* Get the first and the only association from the list. */
247 if (!list_empty(&sctp_sk(sk)->ep->asocs))
248 asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
249 struct sctp_association, asocs);
250 return asoc;
251 }
252
253 /* Otherwise this is a UDP-style socket. */
254 if (id <= SCTP_ALL_ASSOC)
255 return NULL;
256
257 spin_lock_bh(&sctp_assocs_id_lock);
258 asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
259 if (asoc && (asoc->base.sk != sk || asoc->base.dead))
260 asoc = NULL;
261 spin_unlock_bh(&sctp_assocs_id_lock);
262
263 return asoc;
264 }
265
266 /* Look up the transport from an address and an assoc id. If both address and
267 * id are specified, the associations matching the address and the id should be
268 * the same.
269 */
sctp_addr_id2transport(struct sock * sk,struct sockaddr_storage * addr,sctp_assoc_t id)270 static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
271 struct sockaddr_storage *addr,
272 sctp_assoc_t id)
273 {
274 struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
275 struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
276 union sctp_addr *laddr = (union sctp_addr *)addr;
277 struct sctp_transport *transport;
278
279 if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
280 return NULL;
281
282 addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
283 laddr,
284 &transport);
285
286 if (!addr_asoc)
287 return NULL;
288
289 id_asoc = sctp_id2assoc(sk, id);
290 if (id_asoc && (id_asoc != addr_asoc))
291 return NULL;
292
293 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
294 (union sctp_addr *)addr);
295
296 return transport;
297 }
298
299 /* API 3.1.2 bind() - UDP Style Syntax
300 * The syntax of bind() is,
301 *
302 * ret = bind(int sd, struct sockaddr *addr, int addrlen);
303 *
304 * sd - the socket descriptor returned by socket().
305 * addr - the address structure (struct sockaddr_in or struct
306 * sockaddr_in6 [RFC 2553]),
307 * addr_len - the size of the address structure.
308 */
sctp_bind(struct sock * sk,struct sockaddr * addr,int addr_len)309 static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
310 {
311 int retval = 0;
312
313 lock_sock(sk);
314
315 pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
316 addr, addr_len);
317
318 /* Disallow binding twice. */
319 if (!sctp_sk(sk)->ep->base.bind_addr.port)
320 retval = sctp_do_bind(sk, (union sctp_addr *)addr,
321 addr_len);
322 else
323 retval = -EINVAL;
324
325 release_sock(sk);
326
327 return retval;
328 }
329
330 static int sctp_get_port_local(struct sock *, union sctp_addr *);
331
332 /* Verify this is a valid sockaddr. */
sctp_sockaddr_af(struct sctp_sock * opt,union sctp_addr * addr,int len)333 static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
334 union sctp_addr *addr, int len)
335 {
336 struct sctp_af *af;
337
338 /* Check minimum size. */
339 if (len < sizeof (struct sockaddr))
340 return NULL;
341
342 if (!opt->pf->af_supported(addr->sa.sa_family, opt))
343 return NULL;
344
345 if (addr->sa.sa_family == AF_INET6) {
346 if (len < SIN6_LEN_RFC2133)
347 return NULL;
348 /* V4 mapped address are really of AF_INET family */
349 if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
350 !opt->pf->af_supported(AF_INET, opt))
351 return NULL;
352 }
353
354 /* If we get this far, af is valid. */
355 af = sctp_get_af_specific(addr->sa.sa_family);
356
357 if (len < af->sockaddr_len)
358 return NULL;
359
360 return af;
361 }
362
sctp_auto_asconf_init(struct sctp_sock * sp)363 static void sctp_auto_asconf_init(struct sctp_sock *sp)
364 {
365 struct net *net = sock_net(&sp->inet.sk);
366
367 if (net->sctp.default_auto_asconf) {
368 spin_lock_bh(&net->sctp.addr_wq_lock);
369 list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
370 spin_unlock_bh(&net->sctp.addr_wq_lock);
371 sp->do_auto_asconf = 1;
372 }
373 }
374
375 /* Bind a local address either to an endpoint or to an association. */
sctp_do_bind(struct sock * sk,union sctp_addr * addr,int len)376 static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
377 {
378 struct net *net = sock_net(sk);
379 struct sctp_sock *sp = sctp_sk(sk);
380 struct sctp_endpoint *ep = sp->ep;
381 struct sctp_bind_addr *bp = &ep->base.bind_addr;
382 struct sctp_af *af;
383 unsigned short snum;
384 int ret = 0;
385
386 /* Common sockaddr verification. */
387 af = sctp_sockaddr_af(sp, addr, len);
388 if (!af) {
389 pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
390 __func__, sk, addr, len);
391 return -EINVAL;
392 }
393
394 snum = ntohs(addr->v4.sin_port);
395
396 pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
397 __func__, sk, &addr->sa, bp->port, snum, len);
398
399 /* PF specific bind() address verification. */
400 if (!sp->pf->bind_verify(sp, addr))
401 return -EADDRNOTAVAIL;
402
403 /* We must either be unbound, or bind to the same port.
404 * It's OK to allow 0 ports if we are already bound.
405 * We'll just inhert an already bound port in this case
406 */
407 if (bp->port) {
408 if (!snum)
409 snum = bp->port;
410 else if (snum != bp->port) {
411 pr_debug("%s: new port %d doesn't match existing port "
412 "%d\n", __func__, snum, bp->port);
413 return -EINVAL;
414 }
415 }
416
417 if (snum && inet_port_requires_bind_service(net, snum) &&
418 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
419 return -EACCES;
420
421 /* See if the address matches any of the addresses we may have
422 * already bound before checking against other endpoints.
423 */
424 if (sctp_bind_addr_match(bp, addr, sp))
425 return -EINVAL;
426
427 /* Make sure we are allowed to bind here.
428 * The function sctp_get_port_local() does duplicate address
429 * detection.
430 */
431 addr->v4.sin_port = htons(snum);
432 if (sctp_get_port_local(sk, addr))
433 return -EADDRINUSE;
434
435 /* Refresh ephemeral port. */
436 if (!bp->port) {
437 bp->port = inet_sk(sk)->inet_num;
438 sctp_auto_asconf_init(sp);
439 }
440
441 /* Add the address to the bind address list.
442 * Use GFP_ATOMIC since BHs will be disabled.
443 */
444 ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
445 SCTP_ADDR_SRC, GFP_ATOMIC);
446
447 if (ret) {
448 sctp_put_port(sk);
449 return ret;
450 }
451 /* Copy back into socket for getsockname() use. */
452 inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
453 sp->pf->to_sk_saddr(addr, sk);
454
455 return ret;
456 }
457
458 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
459 *
460 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
461 * at any one time. If a sender, after sending an ASCONF chunk, decides
462 * it needs to transfer another ASCONF Chunk, it MUST wait until the
463 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
464 * subsequent ASCONF. Note this restriction binds each side, so at any
465 * time two ASCONF may be in-transit on any given association (one sent
466 * from each endpoint).
467 */
sctp_send_asconf(struct sctp_association * asoc,struct sctp_chunk * chunk)468 static int sctp_send_asconf(struct sctp_association *asoc,
469 struct sctp_chunk *chunk)
470 {
471 int retval = 0;
472
473 /* If there is an outstanding ASCONF chunk, queue it for later
474 * transmission.
475 */
476 if (asoc->addip_last_asconf) {
477 list_add_tail(&chunk->list, &asoc->addip_chunk_list);
478 goto out;
479 }
480
481 /* Hold the chunk until an ASCONF_ACK is received. */
482 sctp_chunk_hold(chunk);
483 retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
484 if (retval)
485 sctp_chunk_free(chunk);
486 else
487 asoc->addip_last_asconf = chunk;
488
489 out:
490 return retval;
491 }
492
493 /* Add a list of addresses as bind addresses to local endpoint or
494 * association.
495 *
496 * Basically run through each address specified in the addrs/addrcnt
497 * array/length pair, determine if it is IPv6 or IPv4 and call
498 * sctp_do_bind() on it.
499 *
500 * If any of them fails, then the operation will be reversed and the
501 * ones that were added will be removed.
502 *
503 * Only sctp_setsockopt_bindx() is supposed to call this function.
504 */
sctp_bindx_add(struct sock * sk,struct sockaddr * addrs,int addrcnt)505 static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
506 {
507 int cnt;
508 int retval = 0;
509 void *addr_buf;
510 struct sockaddr *sa_addr;
511 struct sctp_af *af;
512
513 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
514 addrs, addrcnt);
515
516 addr_buf = addrs;
517 for (cnt = 0; cnt < addrcnt; cnt++) {
518 /* The list may contain either IPv4 or IPv6 address;
519 * determine the address length for walking thru the list.
520 */
521 sa_addr = addr_buf;
522 af = sctp_get_af_specific(sa_addr->sa_family);
523 if (!af) {
524 retval = -EINVAL;
525 goto err_bindx_add;
526 }
527
528 retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
529 af->sockaddr_len);
530
531 addr_buf += af->sockaddr_len;
532
533 err_bindx_add:
534 if (retval < 0) {
535 /* Failed. Cleanup the ones that have been added */
536 if (cnt > 0)
537 sctp_bindx_rem(sk, addrs, cnt);
538 return retval;
539 }
540 }
541
542 return retval;
543 }
544
545 /* Send an ASCONF chunk with Add IP address parameters to all the peers of the
546 * associations that are part of the endpoint indicating that a list of local
547 * addresses are added to the endpoint.
548 *
549 * If any of the addresses is already in the bind address list of the
550 * association, we do not send the chunk for that association. But it will not
551 * affect other associations.
552 *
553 * Only sctp_setsockopt_bindx() is supposed to call this function.
554 */
sctp_send_asconf_add_ip(struct sock * sk,struct sockaddr * addrs,int addrcnt)555 static int sctp_send_asconf_add_ip(struct sock *sk,
556 struct sockaddr *addrs,
557 int addrcnt)
558 {
559 struct sctp_sock *sp;
560 struct sctp_endpoint *ep;
561 struct sctp_association *asoc;
562 struct sctp_bind_addr *bp;
563 struct sctp_chunk *chunk;
564 struct sctp_sockaddr_entry *laddr;
565 union sctp_addr *addr;
566 union sctp_addr saveaddr;
567 void *addr_buf;
568 struct sctp_af *af;
569 struct list_head *p;
570 int i;
571 int retval = 0;
572
573 sp = sctp_sk(sk);
574 ep = sp->ep;
575
576 if (!ep->asconf_enable)
577 return retval;
578
579 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
580 __func__, sk, addrs, addrcnt);
581
582 list_for_each_entry(asoc, &ep->asocs, asocs) {
583 if (!asoc->peer.asconf_capable)
584 continue;
585
586 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
587 continue;
588
589 if (!sctp_state(asoc, ESTABLISHED))
590 continue;
591
592 /* Check if any address in the packed array of addresses is
593 * in the bind address list of the association. If so,
594 * do not send the asconf chunk to its peer, but continue with
595 * other associations.
596 */
597 addr_buf = addrs;
598 for (i = 0; i < addrcnt; i++) {
599 addr = addr_buf;
600 af = sctp_get_af_specific(addr->v4.sin_family);
601 if (!af) {
602 retval = -EINVAL;
603 goto out;
604 }
605
606 if (sctp_assoc_lookup_laddr(asoc, addr))
607 break;
608
609 addr_buf += af->sockaddr_len;
610 }
611 if (i < addrcnt)
612 continue;
613
614 /* Use the first valid address in bind addr list of
615 * association as Address Parameter of ASCONF CHUNK.
616 */
617 bp = &asoc->base.bind_addr;
618 p = bp->address_list.next;
619 laddr = list_entry(p, struct sctp_sockaddr_entry, list);
620 chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
621 addrcnt, SCTP_PARAM_ADD_IP);
622 if (!chunk) {
623 retval = -ENOMEM;
624 goto out;
625 }
626
627 /* Add the new addresses to the bind address list with
628 * use_as_src set to 0.
629 */
630 addr_buf = addrs;
631 for (i = 0; i < addrcnt; i++) {
632 addr = addr_buf;
633 af = sctp_get_af_specific(addr->v4.sin_family);
634 memcpy(&saveaddr, addr, af->sockaddr_len);
635 retval = sctp_add_bind_addr(bp, &saveaddr,
636 sizeof(saveaddr),
637 SCTP_ADDR_NEW, GFP_ATOMIC);
638 addr_buf += af->sockaddr_len;
639 }
640 if (asoc->src_out_of_asoc_ok) {
641 struct sctp_transport *trans;
642
643 list_for_each_entry(trans,
644 &asoc->peer.transport_addr_list, transports) {
645 trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
646 2*asoc->pathmtu, 4380));
647 trans->ssthresh = asoc->peer.i.a_rwnd;
648 trans->rto = asoc->rto_initial;
649 sctp_max_rto(asoc, trans);
650 trans->rtt = trans->srtt = trans->rttvar = 0;
651 /* Clear the source and route cache */
652 sctp_transport_route(trans, NULL,
653 sctp_sk(asoc->base.sk));
654 }
655 }
656 retval = sctp_send_asconf(asoc, chunk);
657 }
658
659 out:
660 return retval;
661 }
662
663 /* Remove a list of addresses from bind addresses list. Do not remove the
664 * last address.
665 *
666 * Basically run through each address specified in the addrs/addrcnt
667 * array/length pair, determine if it is IPv6 or IPv4 and call
668 * sctp_del_bind() on it.
669 *
670 * If any of them fails, then the operation will be reversed and the
671 * ones that were removed will be added back.
672 *
673 * At least one address has to be left; if only one address is
674 * available, the operation will return -EBUSY.
675 *
676 * Only sctp_setsockopt_bindx() is supposed to call this function.
677 */
sctp_bindx_rem(struct sock * sk,struct sockaddr * addrs,int addrcnt)678 static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
679 {
680 struct sctp_sock *sp = sctp_sk(sk);
681 struct sctp_endpoint *ep = sp->ep;
682 int cnt;
683 struct sctp_bind_addr *bp = &ep->base.bind_addr;
684 int retval = 0;
685 void *addr_buf;
686 union sctp_addr *sa_addr;
687 struct sctp_af *af;
688
689 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
690 __func__, sk, addrs, addrcnt);
691
692 addr_buf = addrs;
693 for (cnt = 0; cnt < addrcnt; cnt++) {
694 /* If the bind address list is empty or if there is only one
695 * bind address, there is nothing more to be removed (we need
696 * at least one address here).
697 */
698 if (list_empty(&bp->address_list) ||
699 (sctp_list_single_entry(&bp->address_list))) {
700 retval = -EBUSY;
701 goto err_bindx_rem;
702 }
703
704 sa_addr = addr_buf;
705 af = sctp_get_af_specific(sa_addr->sa.sa_family);
706 if (!af) {
707 retval = -EINVAL;
708 goto err_bindx_rem;
709 }
710
711 if (!af->addr_valid(sa_addr, sp, NULL)) {
712 retval = -EADDRNOTAVAIL;
713 goto err_bindx_rem;
714 }
715
716 if (sa_addr->v4.sin_port &&
717 sa_addr->v4.sin_port != htons(bp->port)) {
718 retval = -EINVAL;
719 goto err_bindx_rem;
720 }
721
722 if (!sa_addr->v4.sin_port)
723 sa_addr->v4.sin_port = htons(bp->port);
724
725 /* FIXME - There is probably a need to check if sk->sk_saddr and
726 * sk->sk_rcv_addr are currently set to one of the addresses to
727 * be removed. This is something which needs to be looked into
728 * when we are fixing the outstanding issues with multi-homing
729 * socket routing and failover schemes. Refer to comments in
730 * sctp_do_bind(). -daisy
731 */
732 retval = sctp_del_bind_addr(bp, sa_addr);
733
734 addr_buf += af->sockaddr_len;
735 err_bindx_rem:
736 if (retval < 0) {
737 /* Failed. Add the ones that has been removed back */
738 if (cnt > 0)
739 sctp_bindx_add(sk, addrs, cnt);
740 return retval;
741 }
742 }
743
744 return retval;
745 }
746
747 /* Send an ASCONF chunk with Delete IP address parameters to all the peers of
748 * the associations that are part of the endpoint indicating that a list of
749 * local addresses are removed from the endpoint.
750 *
751 * If any of the addresses is already in the bind address list of the
752 * association, we do not send the chunk for that association. But it will not
753 * affect other associations.
754 *
755 * Only sctp_setsockopt_bindx() is supposed to call this function.
756 */
sctp_send_asconf_del_ip(struct sock * sk,struct sockaddr * addrs,int addrcnt)757 static int sctp_send_asconf_del_ip(struct sock *sk,
758 struct sockaddr *addrs,
759 int addrcnt)
760 {
761 struct sctp_sock *sp;
762 struct sctp_endpoint *ep;
763 struct sctp_association *asoc;
764 struct sctp_transport *transport;
765 struct sctp_bind_addr *bp;
766 struct sctp_chunk *chunk;
767 union sctp_addr *laddr;
768 void *addr_buf;
769 struct sctp_af *af;
770 struct sctp_sockaddr_entry *saddr;
771 int i;
772 int retval = 0;
773 int stored = 0;
774
775 chunk = NULL;
776 sp = sctp_sk(sk);
777 ep = sp->ep;
778
779 if (!ep->asconf_enable)
780 return retval;
781
782 pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
783 __func__, sk, addrs, addrcnt);
784
785 list_for_each_entry(asoc, &ep->asocs, asocs) {
786
787 if (!asoc->peer.asconf_capable)
788 continue;
789
790 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
791 continue;
792
793 if (!sctp_state(asoc, ESTABLISHED))
794 continue;
795
796 /* Check if any address in the packed array of addresses is
797 * not present in the bind address list of the association.
798 * If so, do not send the asconf chunk to its peer, but
799 * continue with other associations.
800 */
801 addr_buf = addrs;
802 for (i = 0; i < addrcnt; i++) {
803 laddr = addr_buf;
804 af = sctp_get_af_specific(laddr->v4.sin_family);
805 if (!af) {
806 retval = -EINVAL;
807 goto out;
808 }
809
810 if (!sctp_assoc_lookup_laddr(asoc, laddr))
811 break;
812
813 addr_buf += af->sockaddr_len;
814 }
815 if (i < addrcnt)
816 continue;
817
818 /* Find one address in the association's bind address list
819 * that is not in the packed array of addresses. This is to
820 * make sure that we do not delete all the addresses in the
821 * association.
822 */
823 bp = &asoc->base.bind_addr;
824 laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
825 addrcnt, sp);
826 if ((laddr == NULL) && (addrcnt == 1)) {
827 if (asoc->asconf_addr_del_pending)
828 continue;
829 asoc->asconf_addr_del_pending =
830 kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
831 if (asoc->asconf_addr_del_pending == NULL) {
832 retval = -ENOMEM;
833 goto out;
834 }
835 asoc->asconf_addr_del_pending->sa.sa_family =
836 addrs->sa_family;
837 asoc->asconf_addr_del_pending->v4.sin_port =
838 htons(bp->port);
839 if (addrs->sa_family == AF_INET) {
840 struct sockaddr_in *sin;
841
842 sin = (struct sockaddr_in *)addrs;
843 asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
844 } else if (addrs->sa_family == AF_INET6) {
845 struct sockaddr_in6 *sin6;
846
847 sin6 = (struct sockaddr_in6 *)addrs;
848 asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
849 }
850
851 pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
852 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
853 asoc->asconf_addr_del_pending);
854
855 asoc->src_out_of_asoc_ok = 1;
856 stored = 1;
857 goto skip_mkasconf;
858 }
859
860 if (laddr == NULL)
861 return -EINVAL;
862
863 /* We do not need RCU protection throughout this loop
864 * because this is done under a socket lock from the
865 * setsockopt call.
866 */
867 chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
868 SCTP_PARAM_DEL_IP);
869 if (!chunk) {
870 retval = -ENOMEM;
871 goto out;
872 }
873
874 skip_mkasconf:
875 /* Reset use_as_src flag for the addresses in the bind address
876 * list that are to be deleted.
877 */
878 addr_buf = addrs;
879 for (i = 0; i < addrcnt; i++) {
880 laddr = addr_buf;
881 af = sctp_get_af_specific(laddr->v4.sin_family);
882 list_for_each_entry(saddr, &bp->address_list, list) {
883 if (sctp_cmp_addr_exact(&saddr->a, laddr))
884 saddr->state = SCTP_ADDR_DEL;
885 }
886 addr_buf += af->sockaddr_len;
887 }
888
889 /* Update the route and saddr entries for all the transports
890 * as some of the addresses in the bind address list are
891 * about to be deleted and cannot be used as source addresses.
892 */
893 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
894 transports) {
895 sctp_transport_route(transport, NULL,
896 sctp_sk(asoc->base.sk));
897 }
898
899 if (stored)
900 /* We don't need to transmit ASCONF */
901 continue;
902 retval = sctp_send_asconf(asoc, chunk);
903 }
904 out:
905 return retval;
906 }
907
908 /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */
sctp_asconf_mgmt(struct sctp_sock * sp,struct sctp_sockaddr_entry * addrw)909 int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
910 {
911 struct sock *sk = sctp_opt2sk(sp);
912 union sctp_addr *addr;
913 struct sctp_af *af;
914
915 /* It is safe to write port space in caller. */
916 addr = &addrw->a;
917 addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
918 af = sctp_get_af_specific(addr->sa.sa_family);
919 if (!af)
920 return -EINVAL;
921 if (sctp_verify_addr(sk, addr, af->sockaddr_len))
922 return -EINVAL;
923
924 if (addrw->state == SCTP_ADDR_NEW)
925 return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
926 else
927 return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
928 }
929
930 /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
931 *
932 * API 8.1
933 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
934 * int flags);
935 *
936 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
937 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
938 * or IPv6 addresses.
939 *
940 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
941 * Section 3.1.2 for this usage.
942 *
943 * addrs is a pointer to an array of one or more socket addresses. Each
944 * address is contained in its appropriate structure (i.e. struct
945 * sockaddr_in or struct sockaddr_in6) the family of the address type
946 * must be used to distinguish the address length (note that this
947 * representation is termed a "packed array" of addresses). The caller
948 * specifies the number of addresses in the array with addrcnt.
949 *
950 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
951 * -1, and sets errno to the appropriate error code.
952 *
953 * For SCTP, the port given in each socket address must be the same, or
954 * sctp_bindx() will fail, setting errno to EINVAL.
955 *
956 * The flags parameter is formed from the bitwise OR of zero or more of
957 * the following currently defined flags:
958 *
959 * SCTP_BINDX_ADD_ADDR
960 *
961 * SCTP_BINDX_REM_ADDR
962 *
963 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
964 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
965 * addresses from the association. The two flags are mutually exclusive;
966 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
967 * not remove all addresses from an association; sctp_bindx() will
968 * reject such an attempt with EINVAL.
969 *
970 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
971 * additional addresses with an endpoint after calling bind(). Or use
972 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
973 * socket is associated with so that no new association accepted will be
974 * associated with those addresses. If the endpoint supports dynamic
975 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
976 * endpoint to send the appropriate message to the peer to change the
977 * peers address lists.
978 *
979 * Adding and removing addresses from a connected association is
980 * optional functionality. Implementations that do not support this
981 * functionality should return EOPNOTSUPP.
982 *
983 * Basically do nothing but copying the addresses from user to kernel
984 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
985 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
986 * from userspace.
987 *
988 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
989 * it.
990 *
991 * sk The sk of the socket
992 * addrs The pointer to the addresses
993 * addrssize Size of the addrs buffer
994 * op Operation to perform (add or remove, see the flags of
995 * sctp_bindx)
996 *
997 * Returns 0 if ok, <0 errno code on error.
998 */
sctp_setsockopt_bindx(struct sock * sk,struct sockaddr * addrs,int addrs_size,int op)999 static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
1000 int addrs_size, int op)
1001 {
1002 int err;
1003 int addrcnt = 0;
1004 int walk_size = 0;
1005 struct sockaddr *sa_addr;
1006 void *addr_buf = addrs;
1007 struct sctp_af *af;
1008
1009 pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1010 __func__, sk, addr_buf, addrs_size, op);
1011
1012 if (unlikely(addrs_size <= 0))
1013 return -EINVAL;
1014
1015 /* Walk through the addrs buffer and count the number of addresses. */
1016 while (walk_size < addrs_size) {
1017 if (walk_size + sizeof(sa_family_t) > addrs_size)
1018 return -EINVAL;
1019
1020 sa_addr = addr_buf;
1021 af = sctp_get_af_specific(sa_addr->sa_family);
1022
1023 /* If the address family is not supported or if this address
1024 * causes the address buffer to overflow return EINVAL.
1025 */
1026 if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1027 return -EINVAL;
1028 addrcnt++;
1029 addr_buf += af->sockaddr_len;
1030 walk_size += af->sockaddr_len;
1031 }
1032
1033 /* Do the work. */
1034 switch (op) {
1035 case SCTP_BINDX_ADD_ADDR:
1036 /* Allow security module to validate bindx addresses. */
1037 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1038 addrs, addrs_size);
1039 if (err)
1040 return err;
1041 err = sctp_bindx_add(sk, addrs, addrcnt);
1042 if (err)
1043 return err;
1044 return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1045 case SCTP_BINDX_REM_ADDR:
1046 err = sctp_bindx_rem(sk, addrs, addrcnt);
1047 if (err)
1048 return err;
1049 return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1050
1051 default:
1052 return -EINVAL;
1053 }
1054 }
1055
sctp_bind_add(struct sock * sk,struct sockaddr * addrs,int addrlen)1056 static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1057 int addrlen)
1058 {
1059 int err;
1060
1061 lock_sock(sk);
1062 err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1063 release_sock(sk);
1064 return err;
1065 }
1066
sctp_connect_new_asoc(struct sctp_endpoint * ep,const union sctp_addr * daddr,const struct sctp_initmsg * init,struct sctp_transport ** tp)1067 static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1068 const union sctp_addr *daddr,
1069 const struct sctp_initmsg *init,
1070 struct sctp_transport **tp)
1071 {
1072 struct sctp_association *asoc;
1073 struct sock *sk = ep->base.sk;
1074 struct net *net = sock_net(sk);
1075 enum sctp_scope scope;
1076 int err;
1077
1078 if (sctp_endpoint_is_peeled_off(ep, daddr))
1079 return -EADDRNOTAVAIL;
1080
1081 if (!ep->base.bind_addr.port) {
1082 if (sctp_autobind(sk))
1083 return -EAGAIN;
1084 } else {
1085 if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1086 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1087 return -EACCES;
1088 }
1089
1090 scope = sctp_scope(daddr);
1091 asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1092 if (!asoc)
1093 return -ENOMEM;
1094
1095 err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1096 if (err < 0)
1097 goto free;
1098
1099 *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1100 if (!*tp) {
1101 err = -ENOMEM;
1102 goto free;
1103 }
1104
1105 if (!init)
1106 return 0;
1107
1108 if (init->sinit_num_ostreams) {
1109 __u16 outcnt = init->sinit_num_ostreams;
1110
1111 asoc->c.sinit_num_ostreams = outcnt;
1112 /* outcnt has been changed, need to re-init stream */
1113 err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1114 if (err)
1115 goto free;
1116 }
1117
1118 if (init->sinit_max_instreams)
1119 asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1120
1121 if (init->sinit_max_attempts)
1122 asoc->max_init_attempts = init->sinit_max_attempts;
1123
1124 if (init->sinit_max_init_timeo)
1125 asoc->max_init_timeo =
1126 msecs_to_jiffies(init->sinit_max_init_timeo);
1127
1128 return 0;
1129 free:
1130 sctp_association_free(asoc);
1131 return err;
1132 }
1133
sctp_connect_add_peer(struct sctp_association * asoc,union sctp_addr * daddr,int addr_len)1134 static int sctp_connect_add_peer(struct sctp_association *asoc,
1135 union sctp_addr *daddr, int addr_len)
1136 {
1137 struct sctp_endpoint *ep = asoc->ep;
1138 struct sctp_association *old;
1139 struct sctp_transport *t;
1140 int err;
1141
1142 err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1143 if (err)
1144 return err;
1145
1146 old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1147 if (old && old != asoc)
1148 return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1149 : -EALREADY;
1150
1151 if (sctp_endpoint_is_peeled_off(ep, daddr))
1152 return -EADDRNOTAVAIL;
1153
1154 t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1155 if (!t)
1156 return -ENOMEM;
1157
1158 return 0;
1159 }
1160
1161 /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1162 *
1163 * Common routine for handling connect() and sctp_connectx().
1164 * Connect will come in with just a single address.
1165 */
__sctp_connect(struct sock * sk,struct sockaddr * kaddrs,int addrs_size,int flags,sctp_assoc_t * assoc_id)1166 static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1167 int addrs_size, int flags, sctp_assoc_t *assoc_id)
1168 {
1169 struct sctp_sock *sp = sctp_sk(sk);
1170 struct sctp_endpoint *ep = sp->ep;
1171 struct sctp_transport *transport;
1172 struct sctp_association *asoc;
1173 void *addr_buf = kaddrs;
1174 union sctp_addr *daddr;
1175 struct sctp_af *af;
1176 int walk_size, err;
1177 long timeo;
1178
1179 if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1180 (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1181 return -EISCONN;
1182
1183 daddr = addr_buf;
1184 af = sctp_get_af_specific(daddr->sa.sa_family);
1185 if (!af || af->sockaddr_len > addrs_size)
1186 return -EINVAL;
1187
1188 err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1189 if (err)
1190 return err;
1191
1192 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1193 if (asoc)
1194 return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1195 : -EALREADY;
1196
1197 err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1198 if (err)
1199 return err;
1200 asoc = transport->asoc;
1201
1202 addr_buf += af->sockaddr_len;
1203 walk_size = af->sockaddr_len;
1204 while (walk_size < addrs_size) {
1205 err = -EINVAL;
1206 if (walk_size + sizeof(sa_family_t) > addrs_size)
1207 goto out_free;
1208
1209 daddr = addr_buf;
1210 af = sctp_get_af_specific(daddr->sa.sa_family);
1211 if (!af || af->sockaddr_len + walk_size > addrs_size)
1212 goto out_free;
1213
1214 if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1215 goto out_free;
1216
1217 err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1218 if (err)
1219 goto out_free;
1220
1221 addr_buf += af->sockaddr_len;
1222 walk_size += af->sockaddr_len;
1223 }
1224
1225 /* In case the user of sctp_connectx() wants an association
1226 * id back, assign one now.
1227 */
1228 if (assoc_id) {
1229 err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1230 if (err < 0)
1231 goto out_free;
1232 }
1233
1234 err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1235 if (err < 0)
1236 goto out_free;
1237
1238 /* Initialize sk's dport and daddr for getpeername() */
1239 inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1240 sp->pf->to_sk_daddr(daddr, sk);
1241 sk->sk_err = 0;
1242
1243 if (assoc_id)
1244 *assoc_id = asoc->assoc_id;
1245
1246 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1247 return sctp_wait_for_connect(asoc, &timeo);
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 sctp_association_free(asoc);
1253 return err;
1254 }
1255
1256 /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1257 *
1258 * API 8.9
1259 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1260 * sctp_assoc_t *asoc);
1261 *
1262 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1263 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1264 * or IPv6 addresses.
1265 *
1266 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1267 * Section 3.1.2 for this usage.
1268 *
1269 * addrs is a pointer to an array of one or more socket addresses. Each
1270 * address is contained in its appropriate structure (i.e. struct
1271 * sockaddr_in or struct sockaddr_in6) the family of the address type
1272 * must be used to distengish the address length (note that this
1273 * representation is termed a "packed array" of addresses). The caller
1274 * specifies the number of addresses in the array with addrcnt.
1275 *
1276 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1277 * the association id of the new association. On failure, sctp_connectx()
1278 * returns -1, and sets errno to the appropriate error code. The assoc_id
1279 * is not touched by the kernel.
1280 *
1281 * For SCTP, the port given in each socket address must be the same, or
1282 * sctp_connectx() will fail, setting errno to EINVAL.
1283 *
1284 * An application can use sctp_connectx to initiate an association with
1285 * an endpoint that is multi-homed. Much like sctp_bindx() this call
1286 * allows a caller to specify multiple addresses at which a peer can be
1287 * reached. The way the SCTP stack uses the list of addresses to set up
1288 * the association is implementation dependent. This function only
1289 * specifies that the stack will try to make use of all the addresses in
1290 * the list when needed.
1291 *
1292 * Note that the list of addresses passed in is only used for setting up
1293 * the association. It does not necessarily equal the set of addresses
1294 * the peer uses for the resulting association. If the caller wants to
1295 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1296 * retrieve them after the association has been set up.
1297 *
1298 * Basically do nothing but copying the addresses from user to kernel
1299 * land and invoking either sctp_connectx(). This is used for tunneling
1300 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1301 *
1302 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1303 * it.
1304 *
1305 * sk The sk of the socket
1306 * addrs The pointer to the addresses
1307 * addrssize Size of the addrs buffer
1308 *
1309 * Returns >=0 if ok, <0 errno code on error.
1310 */
__sctp_setsockopt_connectx(struct sock * sk,struct sockaddr * kaddrs,int addrs_size,sctp_assoc_t * assoc_id)1311 static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1312 int addrs_size, sctp_assoc_t *assoc_id)
1313 {
1314 int err = 0, flags = 0;
1315
1316 pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1317 __func__, sk, kaddrs, addrs_size);
1318
1319 /* make sure the 1st addr's sa_family is accessible later */
1320 if (unlikely(addrs_size < sizeof(sa_family_t)))
1321 return -EINVAL;
1322
1323 /* Allow security module to validate connectx addresses. */
1324 err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1325 (struct sockaddr *)kaddrs,
1326 addrs_size);
1327 if (err)
1328 return err;
1329
1330 /* in-kernel sockets don't generally have a file allocated to them
1331 * if all they do is call sock_create_kern().
1332 */
1333 if (sk->sk_socket->file)
1334 flags = sk->sk_socket->file->f_flags;
1335
1336 return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1337 }
1338
1339 /*
1340 * This is an older interface. It's kept for backward compatibility
1341 * to the option that doesn't provide association id.
1342 */
sctp_setsockopt_connectx_old(struct sock * sk,struct sockaddr * kaddrs,int addrs_size)1343 static int sctp_setsockopt_connectx_old(struct sock *sk,
1344 struct sockaddr *kaddrs,
1345 int addrs_size)
1346 {
1347 return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1348 }
1349
1350 /*
1351 * New interface for the API. The since the API is done with a socket
1352 * option, to make it simple we feed back the association id is as a return
1353 * indication to the call. Error is always negative and association id is
1354 * always positive.
1355 */
sctp_setsockopt_connectx(struct sock * sk,struct sockaddr * kaddrs,int addrs_size)1356 static int sctp_setsockopt_connectx(struct sock *sk,
1357 struct sockaddr *kaddrs,
1358 int addrs_size)
1359 {
1360 sctp_assoc_t assoc_id = 0;
1361 int err = 0;
1362
1363 err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1364
1365 if (err)
1366 return err;
1367 else
1368 return assoc_id;
1369 }
1370
1371 /*
1372 * New (hopefully final) interface for the API.
1373 * We use the sctp_getaddrs_old structure so that use-space library
1374 * can avoid any unnecessary allocations. The only different part
1375 * is that we store the actual length of the address buffer into the
1376 * addrs_num structure member. That way we can re-use the existing
1377 * code.
1378 */
1379 #ifdef CONFIG_COMPAT
1380 struct compat_sctp_getaddrs_old {
1381 sctp_assoc_t assoc_id;
1382 s32 addr_num;
1383 compat_uptr_t addrs; /* struct sockaddr * */
1384 };
1385 #endif
1386
sctp_getsockopt_connectx3(struct sock * sk,int len,char __user * optval,int __user * optlen)1387 static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1388 char __user *optval,
1389 int __user *optlen)
1390 {
1391 struct sctp_getaddrs_old param;
1392 sctp_assoc_t assoc_id = 0;
1393 struct sockaddr *kaddrs;
1394 int err = 0;
1395
1396 #ifdef CONFIG_COMPAT
1397 if (in_compat_syscall()) {
1398 struct compat_sctp_getaddrs_old param32;
1399
1400 if (len < sizeof(param32))
1401 return -EINVAL;
1402 if (copy_from_user(¶m32, optval, sizeof(param32)))
1403 return -EFAULT;
1404
1405 param.assoc_id = param32.assoc_id;
1406 param.addr_num = param32.addr_num;
1407 param.addrs = compat_ptr(param32.addrs);
1408 } else
1409 #endif
1410 {
1411 if (len < sizeof(param))
1412 return -EINVAL;
1413 if (copy_from_user(¶m, optval, sizeof(param)))
1414 return -EFAULT;
1415 }
1416
1417 kaddrs = memdup_user(param.addrs, param.addr_num);
1418 if (IS_ERR(kaddrs))
1419 return PTR_ERR(kaddrs);
1420
1421 err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1422 kfree(kaddrs);
1423 if (err == 0 || err == -EINPROGRESS) {
1424 if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1425 return -EFAULT;
1426 if (put_user(sizeof(assoc_id), optlen))
1427 return -EFAULT;
1428 }
1429
1430 return err;
1431 }
1432
1433 /* API 3.1.4 close() - UDP Style Syntax
1434 * Applications use close() to perform graceful shutdown (as described in
1435 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1436 * by a UDP-style socket.
1437 *
1438 * The syntax is
1439 *
1440 * ret = close(int sd);
1441 *
1442 * sd - the socket descriptor of the associations to be closed.
1443 *
1444 * To gracefully shutdown a specific association represented by the
1445 * UDP-style socket, an application should use the sendmsg() call,
1446 * passing no user data, but including the appropriate flag in the
1447 * ancillary data (see Section xxxx).
1448 *
1449 * If sd in the close() call is a branched-off socket representing only
1450 * one association, the shutdown is performed on that association only.
1451 *
1452 * 4.1.6 close() - TCP Style Syntax
1453 *
1454 * Applications use close() to gracefully close down an association.
1455 *
1456 * The syntax is:
1457 *
1458 * int close(int sd);
1459 *
1460 * sd - the socket descriptor of the association to be closed.
1461 *
1462 * After an application calls close() on a socket descriptor, no further
1463 * socket operations will succeed on that descriptor.
1464 *
1465 * API 7.1.4 SO_LINGER
1466 *
1467 * An application using the TCP-style socket can use this option to
1468 * perform the SCTP ABORT primitive. The linger option structure is:
1469 *
1470 * struct linger {
1471 * int l_onoff; // option on/off
1472 * int l_linger; // linger time
1473 * };
1474 *
1475 * To enable the option, set l_onoff to 1. If the l_linger value is set
1476 * to 0, calling close() is the same as the ABORT primitive. If the
1477 * value is set to a negative value, the setsockopt() call will return
1478 * an error. If the value is set to a positive value linger_time, the
1479 * close() can be blocked for at most linger_time ms. If the graceful
1480 * shutdown phase does not finish during this period, close() will
1481 * return but the graceful shutdown phase continues in the system.
1482 */
sctp_close(struct sock * sk,long timeout)1483 static void sctp_close(struct sock *sk, long timeout)
1484 {
1485 struct net *net = sock_net(sk);
1486 struct sctp_endpoint *ep;
1487 struct sctp_association *asoc;
1488 struct list_head *pos, *temp;
1489 unsigned int data_was_unread;
1490
1491 pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1492
1493 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1494 sk->sk_shutdown = SHUTDOWN_MASK;
1495 inet_sk_set_state(sk, SCTP_SS_CLOSING);
1496
1497 ep = sctp_sk(sk)->ep;
1498
1499 /* Clean up any skbs sitting on the receive queue. */
1500 data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1501 data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1502
1503 /* Walk all associations on an endpoint. */
1504 list_for_each_safe(pos, temp, &ep->asocs) {
1505 asoc = list_entry(pos, struct sctp_association, asocs);
1506
1507 if (sctp_style(sk, TCP)) {
1508 /* A closed association can still be in the list if
1509 * it belongs to a TCP-style listening socket that is
1510 * not yet accepted. If so, free it. If not, send an
1511 * ABORT or SHUTDOWN based on the linger options.
1512 */
1513 if (sctp_state(asoc, CLOSED)) {
1514 sctp_association_free(asoc);
1515 continue;
1516 }
1517 }
1518
1519 if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1520 !skb_queue_empty(&asoc->ulpq.reasm) ||
1521 !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1522 (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1523 struct sctp_chunk *chunk;
1524
1525 chunk = sctp_make_abort_user(asoc, NULL, 0);
1526 sctp_primitive_ABORT(net, asoc, chunk);
1527 } else
1528 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1529 }
1530
1531 /* On a TCP-style socket, block for at most linger_time if set. */
1532 if (sctp_style(sk, TCP) && timeout)
1533 sctp_wait_for_close(sk, timeout);
1534
1535 /* This will run the backlog queue. */
1536 release_sock(sk);
1537
1538 /* Supposedly, no process has access to the socket, but
1539 * the net layers still may.
1540 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1541 * held and that should be grabbed before socket lock.
1542 */
1543 spin_lock_bh(&net->sctp.addr_wq_lock);
1544 bh_lock_sock_nested(sk);
1545
1546 /* Hold the sock, since sk_common_release() will put sock_put()
1547 * and we have just a little more cleanup.
1548 */
1549 sock_hold(sk);
1550 sk_common_release(sk);
1551
1552 bh_unlock_sock(sk);
1553 spin_unlock_bh(&net->sctp.addr_wq_lock);
1554
1555 sock_put(sk);
1556
1557 SCTP_DBG_OBJCNT_DEC(sock);
1558 }
1559
1560 /* Handle EPIPE error. */
sctp_error(struct sock * sk,int flags,int err)1561 static int sctp_error(struct sock *sk, int flags, int err)
1562 {
1563 if (err == -EPIPE)
1564 err = sock_error(sk) ? : -EPIPE;
1565 if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1566 send_sig(SIGPIPE, current, 0);
1567 return err;
1568 }
1569
1570 /* API 3.1.3 sendmsg() - UDP Style Syntax
1571 *
1572 * An application uses sendmsg() and recvmsg() calls to transmit data to
1573 * and receive data from its peer.
1574 *
1575 * ssize_t sendmsg(int socket, const struct msghdr *message,
1576 * int flags);
1577 *
1578 * socket - the socket descriptor of the endpoint.
1579 * message - pointer to the msghdr structure which contains a single
1580 * user message and possibly some ancillary data.
1581 *
1582 * See Section 5 for complete description of the data
1583 * structures.
1584 *
1585 * flags - flags sent or received with the user message, see Section
1586 * 5 for complete description of the flags.
1587 *
1588 * Note: This function could use a rewrite especially when explicit
1589 * connect support comes in.
1590 */
1591 /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */
1592
1593 static int sctp_msghdr_parse(const struct msghdr *msg,
1594 struct sctp_cmsgs *cmsgs);
1595
sctp_sendmsg_parse(struct sock * sk,struct sctp_cmsgs * cmsgs,struct sctp_sndrcvinfo * srinfo,const struct msghdr * msg,size_t msg_len)1596 static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1597 struct sctp_sndrcvinfo *srinfo,
1598 const struct msghdr *msg, size_t msg_len)
1599 {
1600 __u16 sflags;
1601 int err;
1602
1603 if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1604 return -EPIPE;
1605
1606 if (msg_len > sk->sk_sndbuf)
1607 return -EMSGSIZE;
1608
1609 memset(cmsgs, 0, sizeof(*cmsgs));
1610 err = sctp_msghdr_parse(msg, cmsgs);
1611 if (err) {
1612 pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1613 return err;
1614 }
1615
1616 memset(srinfo, 0, sizeof(*srinfo));
1617 if (cmsgs->srinfo) {
1618 srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1619 srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1620 srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1621 srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1622 srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1623 srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1624 }
1625
1626 if (cmsgs->sinfo) {
1627 srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1628 srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1629 srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1630 srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1631 srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1632 }
1633
1634 if (cmsgs->prinfo) {
1635 srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1636 SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1637 cmsgs->prinfo->pr_policy);
1638 }
1639
1640 sflags = srinfo->sinfo_flags;
1641 if (!sflags && msg_len)
1642 return 0;
1643
1644 if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1645 return -EINVAL;
1646
1647 if (((sflags & SCTP_EOF) && msg_len > 0) ||
1648 (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1649 return -EINVAL;
1650
1651 if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1652 return -EINVAL;
1653
1654 return 0;
1655 }
1656
sctp_sendmsg_new_asoc(struct sock * sk,__u16 sflags,struct sctp_cmsgs * cmsgs,union sctp_addr * daddr,struct sctp_transport ** tp)1657 static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1658 struct sctp_cmsgs *cmsgs,
1659 union sctp_addr *daddr,
1660 struct sctp_transport **tp)
1661 {
1662 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1663 struct sctp_association *asoc;
1664 struct cmsghdr *cmsg;
1665 __be32 flowinfo = 0;
1666 struct sctp_af *af;
1667 int err;
1668
1669 *tp = NULL;
1670
1671 if (sflags & (SCTP_EOF | SCTP_ABORT))
1672 return -EINVAL;
1673
1674 if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1675 sctp_sstate(sk, CLOSING)))
1676 return -EADDRNOTAVAIL;
1677
1678 /* Label connection socket for first association 1-to-many
1679 * style for client sequence socket()->sendmsg(). This
1680 * needs to be done before sctp_assoc_add_peer() as that will
1681 * set up the initial packet that needs to account for any
1682 * security ip options (CIPSO/CALIPSO) added to the packet.
1683 */
1684 af = sctp_get_af_specific(daddr->sa.sa_family);
1685 if (!af)
1686 return -EINVAL;
1687 err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1688 (struct sockaddr *)daddr,
1689 af->sockaddr_len);
1690 if (err < 0)
1691 return err;
1692
1693 err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1694 if (err)
1695 return err;
1696 asoc = (*tp)->asoc;
1697
1698 if (!cmsgs->addrs_msg)
1699 return 0;
1700
1701 if (daddr->sa.sa_family == AF_INET6)
1702 flowinfo = daddr->v6.sin6_flowinfo;
1703
1704 /* sendv addr list parse */
1705 for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1706 union sctp_addr _daddr;
1707 int dlen;
1708
1709 if (cmsg->cmsg_level != IPPROTO_SCTP ||
1710 (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1711 cmsg->cmsg_type != SCTP_DSTADDRV6))
1712 continue;
1713
1714 daddr = &_daddr;
1715 memset(daddr, 0, sizeof(*daddr));
1716 dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1717 if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1718 if (dlen < sizeof(struct in_addr)) {
1719 err = -EINVAL;
1720 goto free;
1721 }
1722
1723 dlen = sizeof(struct in_addr);
1724 daddr->v4.sin_family = AF_INET;
1725 daddr->v4.sin_port = htons(asoc->peer.port);
1726 memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1727 } else {
1728 if (dlen < sizeof(struct in6_addr)) {
1729 err = -EINVAL;
1730 goto free;
1731 }
1732
1733 dlen = sizeof(struct in6_addr);
1734 daddr->v6.sin6_flowinfo = flowinfo;
1735 daddr->v6.sin6_family = AF_INET6;
1736 daddr->v6.sin6_port = htons(asoc->peer.port);
1737 memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1738 }
1739
1740 err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1741 if (err)
1742 goto free;
1743 }
1744
1745 return 0;
1746
1747 free:
1748 sctp_association_free(asoc);
1749 return err;
1750 }
1751
sctp_sendmsg_check_sflags(struct sctp_association * asoc,__u16 sflags,struct msghdr * msg,size_t msg_len)1752 static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1753 __u16 sflags, struct msghdr *msg,
1754 size_t msg_len)
1755 {
1756 struct sock *sk = asoc->base.sk;
1757 struct net *net = sock_net(sk);
1758
1759 if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1760 return -EPIPE;
1761
1762 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1763 !sctp_state(asoc, ESTABLISHED))
1764 return 0;
1765
1766 if (sflags & SCTP_EOF) {
1767 pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1768 sctp_primitive_SHUTDOWN(net, asoc, NULL);
1769
1770 return 0;
1771 }
1772
1773 if (sflags & SCTP_ABORT) {
1774 struct sctp_chunk *chunk;
1775
1776 chunk = sctp_make_abort_user(asoc, msg, msg_len);
1777 if (!chunk)
1778 return -ENOMEM;
1779
1780 pr_debug("%s: aborting association:%p\n", __func__, asoc);
1781 sctp_primitive_ABORT(net, asoc, chunk);
1782 iov_iter_revert(&msg->msg_iter, msg_len);
1783
1784 return 0;
1785 }
1786
1787 return 1;
1788 }
1789
sctp_sendmsg_to_asoc(struct sctp_association * asoc,struct msghdr * msg,size_t msg_len,struct sctp_transport * transport,struct sctp_sndrcvinfo * sinfo)1790 static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1791 struct msghdr *msg, size_t msg_len,
1792 struct sctp_transport *transport,
1793 struct sctp_sndrcvinfo *sinfo)
1794 {
1795 struct sock *sk = asoc->base.sk;
1796 struct sctp_sock *sp = sctp_sk(sk);
1797 struct net *net = sock_net(sk);
1798 struct sctp_datamsg *datamsg;
1799 bool wait_connect = false;
1800 struct sctp_chunk *chunk;
1801 long timeo;
1802 int err;
1803
1804 if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1805 err = -EINVAL;
1806 goto err;
1807 }
1808
1809 if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1810 err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1811 if (err)
1812 goto err;
1813 }
1814
1815 if (sp->disable_fragments && msg_len > asoc->frag_point) {
1816 err = -EMSGSIZE;
1817 goto err;
1818 }
1819
1820 if (asoc->pmtu_pending) {
1821 if (sp->param_flags & SPP_PMTUD_ENABLE)
1822 sctp_assoc_sync_pmtu(asoc);
1823 asoc->pmtu_pending = 0;
1824 }
1825
1826 if (sctp_wspace(asoc) < (int)msg_len)
1827 sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1828
1829 if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1830 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1831 err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1832 if (err)
1833 goto err;
1834 if (unlikely(sinfo->sinfo_stream >= asoc->stream.outcnt)) {
1835 err = -EINVAL;
1836 goto err;
1837 }
1838 }
1839
1840 if (sctp_state(asoc, CLOSED)) {
1841 err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1842 if (err)
1843 goto err;
1844
1845 if (asoc->ep->intl_enable) {
1846 timeo = sock_sndtimeo(sk, 0);
1847 err = sctp_wait_for_connect(asoc, &timeo);
1848 if (err) {
1849 err = -ESRCH;
1850 goto err;
1851 }
1852 } else {
1853 wait_connect = true;
1854 }
1855
1856 pr_debug("%s: we associated primitively\n", __func__);
1857 }
1858
1859 datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1860 if (IS_ERR(datamsg)) {
1861 err = PTR_ERR(datamsg);
1862 goto err;
1863 }
1864
1865 asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1866
1867 list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1868 sctp_chunk_hold(chunk);
1869 sctp_set_owner_w(chunk);
1870 chunk->transport = transport;
1871 }
1872
1873 err = sctp_primitive_SEND(net, asoc, datamsg);
1874 if (err) {
1875 sctp_datamsg_free(datamsg);
1876 goto err;
1877 }
1878
1879 pr_debug("%s: we sent primitively\n", __func__);
1880
1881 sctp_datamsg_put(datamsg);
1882
1883 if (unlikely(wait_connect)) {
1884 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1885 sctp_wait_for_connect(asoc, &timeo);
1886 }
1887
1888 err = msg_len;
1889
1890 err:
1891 return err;
1892 }
1893
sctp_sendmsg_get_daddr(struct sock * sk,const struct msghdr * msg,struct sctp_cmsgs * cmsgs)1894 static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1895 const struct msghdr *msg,
1896 struct sctp_cmsgs *cmsgs)
1897 {
1898 union sctp_addr *daddr = NULL;
1899 int err;
1900
1901 if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1902 int len = msg->msg_namelen;
1903
1904 if (len > sizeof(*daddr))
1905 len = sizeof(*daddr);
1906
1907 daddr = (union sctp_addr *)msg->msg_name;
1908
1909 err = sctp_verify_addr(sk, daddr, len);
1910 if (err)
1911 return ERR_PTR(err);
1912 }
1913
1914 return daddr;
1915 }
1916
sctp_sendmsg_update_sinfo(struct sctp_association * asoc,struct sctp_sndrcvinfo * sinfo,struct sctp_cmsgs * cmsgs)1917 static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1918 struct sctp_sndrcvinfo *sinfo,
1919 struct sctp_cmsgs *cmsgs)
1920 {
1921 if (!cmsgs->srinfo && !cmsgs->sinfo) {
1922 sinfo->sinfo_stream = asoc->default_stream;
1923 sinfo->sinfo_ppid = asoc->default_ppid;
1924 sinfo->sinfo_context = asoc->default_context;
1925 sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1926
1927 if (!cmsgs->prinfo)
1928 sinfo->sinfo_flags = asoc->default_flags;
1929 }
1930
1931 if (!cmsgs->srinfo && !cmsgs->prinfo)
1932 sinfo->sinfo_timetolive = asoc->default_timetolive;
1933
1934 if (cmsgs->authinfo) {
1935 /* Reuse sinfo_tsn to indicate that authinfo was set and
1936 * sinfo_ssn to save the keyid on tx path.
1937 */
1938 sinfo->sinfo_tsn = 1;
1939 sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1940 }
1941 }
1942
sctp_sendmsg(struct sock * sk,struct msghdr * msg,size_t msg_len)1943 static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1944 {
1945 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1946 struct sctp_transport *transport = NULL;
1947 struct sctp_sndrcvinfo _sinfo, *sinfo;
1948 struct sctp_association *asoc, *tmp;
1949 struct sctp_cmsgs cmsgs;
1950 union sctp_addr *daddr;
1951 bool new = false;
1952 __u16 sflags;
1953 int err;
1954
1955 /* Parse and get snd_info */
1956 err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1957 if (err)
1958 goto out;
1959
1960 sinfo = &_sinfo;
1961 sflags = sinfo->sinfo_flags;
1962
1963 /* Get daddr from msg */
1964 daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1965 if (IS_ERR(daddr)) {
1966 err = PTR_ERR(daddr);
1967 goto out;
1968 }
1969
1970 lock_sock(sk);
1971
1972 /* SCTP_SENDALL process */
1973 if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1974 list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1975 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1976 msg_len);
1977 if (err == 0)
1978 continue;
1979 if (err < 0)
1980 goto out_unlock;
1981
1982 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1983
1984 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1985 NULL, sinfo);
1986 if (err < 0)
1987 goto out_unlock;
1988
1989 iov_iter_revert(&msg->msg_iter, err);
1990 }
1991
1992 goto out_unlock;
1993 }
1994
1995 /* Get and check or create asoc */
1996 if (daddr) {
1997 asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1998 if (asoc) {
1999 err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
2000 msg_len);
2001 if (err <= 0)
2002 goto out_unlock;
2003 } else {
2004 err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2005 &transport);
2006 if (err)
2007 goto out_unlock;
2008
2009 asoc = transport->asoc;
2010 new = true;
2011 }
2012
2013 if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2014 transport = NULL;
2015 } else {
2016 asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2017 if (!asoc) {
2018 err = -EPIPE;
2019 goto out_unlock;
2020 }
2021
2022 err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2023 if (err <= 0)
2024 goto out_unlock;
2025 }
2026
2027 /* Update snd_info with the asoc */
2028 sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2029
2030 /* Send msg to the asoc */
2031 err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2032 if (err < 0 && err != -ESRCH && new)
2033 sctp_association_free(asoc);
2034
2035 out_unlock:
2036 release_sock(sk);
2037 out:
2038 return sctp_error(sk, msg->msg_flags, err);
2039 }
2040
2041 /* This is an extended version of skb_pull() that removes the data from the
2042 * start of a skb even when data is spread across the list of skb's in the
2043 * frag_list. len specifies the total amount of data that needs to be removed.
2044 * when 'len' bytes could be removed from the skb, it returns 0.
2045 * If 'len' exceeds the total skb length, it returns the no. of bytes that
2046 * could not be removed.
2047 */
sctp_skb_pull(struct sk_buff * skb,int len)2048 static int sctp_skb_pull(struct sk_buff *skb, int len)
2049 {
2050 struct sk_buff *list;
2051 int skb_len = skb_headlen(skb);
2052 int rlen;
2053
2054 if (len <= skb_len) {
2055 __skb_pull(skb, len);
2056 return 0;
2057 }
2058 len -= skb_len;
2059 __skb_pull(skb, skb_len);
2060
2061 skb_walk_frags(skb, list) {
2062 rlen = sctp_skb_pull(list, len);
2063 skb->len -= (len-rlen);
2064 skb->data_len -= (len-rlen);
2065
2066 if (!rlen)
2067 return 0;
2068
2069 len = rlen;
2070 }
2071
2072 return len;
2073 }
2074
2075 /* API 3.1.3 recvmsg() - UDP Style Syntax
2076 *
2077 * ssize_t recvmsg(int socket, struct msghdr *message,
2078 * int flags);
2079 *
2080 * socket - the socket descriptor of the endpoint.
2081 * message - pointer to the msghdr structure which contains a single
2082 * user message and possibly some ancillary data.
2083 *
2084 * See Section 5 for complete description of the data
2085 * structures.
2086 *
2087 * flags - flags sent or received with the user message, see Section
2088 * 5 for complete description of the flags.
2089 */
sctp_recvmsg(struct sock * sk,struct msghdr * msg,size_t len,int flags,int * addr_len)2090 static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2091 int flags, int *addr_len)
2092 {
2093 struct sctp_ulpevent *event = NULL;
2094 struct sctp_sock *sp = sctp_sk(sk);
2095 struct sk_buff *skb, *head_skb;
2096 int copied;
2097 int err = 0;
2098 int skb_len;
2099
2100 pr_debug("%s: sk:%p, msghdr:%p, len:%zd, flags:0x%x, addr_len:%p)\n",
2101 __func__, sk, msg, len, flags, addr_len);
2102
2103 if (unlikely(flags & MSG_ERRQUEUE))
2104 return inet_recv_error(sk, msg, len, addr_len);
2105
2106 if (sk_can_busy_loop(sk) &&
2107 skb_queue_empty_lockless(&sk->sk_receive_queue))
2108 sk_busy_loop(sk, flags & MSG_DONTWAIT);
2109
2110 lock_sock(sk);
2111
2112 if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2113 !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2114 err = -ENOTCONN;
2115 goto out;
2116 }
2117
2118 skb = sctp_skb_recv_datagram(sk, flags, &err);
2119 if (!skb)
2120 goto out;
2121
2122 /* Get the total length of the skb including any skb's in the
2123 * frag_list.
2124 */
2125 skb_len = skb->len;
2126
2127 copied = skb_len;
2128 if (copied > len)
2129 copied = len;
2130
2131 err = skb_copy_datagram_msg(skb, 0, msg, copied);
2132
2133 event = sctp_skb2event(skb);
2134
2135 if (err)
2136 goto out_free;
2137
2138 if (event->chunk && event->chunk->head_skb)
2139 head_skb = event->chunk->head_skb;
2140 else
2141 head_skb = skb;
2142 sock_recv_cmsgs(msg, sk, head_skb);
2143 if (sctp_ulpevent_is_notification(event)) {
2144 msg->msg_flags |= MSG_NOTIFICATION;
2145 sp->pf->event_msgname(event, msg->msg_name, addr_len);
2146 } else {
2147 sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2148 }
2149
2150 /* Check if we allow SCTP_NXTINFO. */
2151 if (sp->recvnxtinfo)
2152 sctp_ulpevent_read_nxtinfo(event, msg, sk);
2153 /* Check if we allow SCTP_RCVINFO. */
2154 if (sp->recvrcvinfo)
2155 sctp_ulpevent_read_rcvinfo(event, msg);
2156 /* Check if we allow SCTP_SNDRCVINFO. */
2157 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2158 sctp_ulpevent_read_sndrcvinfo(event, msg);
2159
2160 err = copied;
2161
2162 /* If skb's length exceeds the user's buffer, update the skb and
2163 * push it back to the receive_queue so that the next call to
2164 * recvmsg() will return the remaining data. Don't set MSG_EOR.
2165 */
2166 if (skb_len > copied) {
2167 msg->msg_flags &= ~MSG_EOR;
2168 if (flags & MSG_PEEK)
2169 goto out_free;
2170 sctp_skb_pull(skb, copied);
2171 skb_queue_head(&sk->sk_receive_queue, skb);
2172
2173 /* When only partial message is copied to the user, increase
2174 * rwnd by that amount. If all the data in the skb is read,
2175 * rwnd is updated when the event is freed.
2176 */
2177 if (!sctp_ulpevent_is_notification(event))
2178 sctp_assoc_rwnd_increase(event->asoc, copied);
2179 goto out;
2180 } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2181 (event->msg_flags & MSG_EOR))
2182 msg->msg_flags |= MSG_EOR;
2183 else
2184 msg->msg_flags &= ~MSG_EOR;
2185
2186 out_free:
2187 if (flags & MSG_PEEK) {
2188 /* Release the skb reference acquired after peeking the skb in
2189 * sctp_skb_recv_datagram().
2190 */
2191 kfree_skb(skb);
2192 } else {
2193 /* Free the event which includes releasing the reference to
2194 * the owner of the skb, freeing the skb and updating the
2195 * rwnd.
2196 */
2197 sctp_ulpevent_free(event);
2198 }
2199 out:
2200 release_sock(sk);
2201 return err;
2202 }
2203
2204 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2205 *
2206 * This option is a on/off flag. If enabled no SCTP message
2207 * fragmentation will be performed. Instead if a message being sent
2208 * exceeds the current PMTU size, the message will NOT be sent and
2209 * instead a error will be indicated to the user.
2210 */
sctp_setsockopt_disable_fragments(struct sock * sk,int * val,unsigned int optlen)2211 static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2212 unsigned int optlen)
2213 {
2214 if (optlen < sizeof(int))
2215 return -EINVAL;
2216 sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2217 return 0;
2218 }
2219
sctp_setsockopt_events(struct sock * sk,__u8 * sn_type,unsigned int optlen)2220 static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2221 unsigned int optlen)
2222 {
2223 struct sctp_sock *sp = sctp_sk(sk);
2224 struct sctp_association *asoc;
2225 int i;
2226
2227 if (optlen > sizeof(struct sctp_event_subscribe))
2228 return -EINVAL;
2229
2230 for (i = 0; i < optlen; i++)
2231 sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2232 sn_type[i]);
2233
2234 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2235 asoc->subscribe = sctp_sk(sk)->subscribe;
2236
2237 /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2238 * if there is no data to be sent or retransmit, the stack will
2239 * immediately send up this notification.
2240 */
2241 if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2242 struct sctp_ulpevent *event;
2243
2244 asoc = sctp_id2assoc(sk, 0);
2245 if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2246 event = sctp_ulpevent_make_sender_dry_event(asoc,
2247 GFP_USER | __GFP_NOWARN);
2248 if (!event)
2249 return -ENOMEM;
2250
2251 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2252 }
2253 }
2254
2255 return 0;
2256 }
2257
2258 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2259 *
2260 * This socket option is applicable to the UDP-style socket only. When
2261 * set it will cause associations that are idle for more than the
2262 * specified number of seconds to automatically close. An association
2263 * being idle is defined an association that has NOT sent or received
2264 * user data. The special value of '0' indicates that no automatic
2265 * close of any associations should be performed. The option expects an
2266 * integer defining the number of seconds of idle time before an
2267 * association is closed.
2268 */
sctp_setsockopt_autoclose(struct sock * sk,u32 * optval,unsigned int optlen)2269 static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2270 unsigned int optlen)
2271 {
2272 struct sctp_sock *sp = sctp_sk(sk);
2273 struct net *net = sock_net(sk);
2274
2275 /* Applicable to UDP-style socket only */
2276 if (sctp_style(sk, TCP))
2277 return -EOPNOTSUPP;
2278 if (optlen != sizeof(int))
2279 return -EINVAL;
2280
2281 sp->autoclose = *optval;
2282 if (sp->autoclose > net->sctp.max_autoclose)
2283 sp->autoclose = net->sctp.max_autoclose;
2284
2285 return 0;
2286 }
2287
2288 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2289 *
2290 * Applications can enable or disable heartbeats for any peer address of
2291 * an association, modify an address's heartbeat interval, force a
2292 * heartbeat to be sent immediately, and adjust the address's maximum
2293 * number of retransmissions sent before an address is considered
2294 * unreachable. The following structure is used to access and modify an
2295 * address's parameters:
2296 *
2297 * struct sctp_paddrparams {
2298 * sctp_assoc_t spp_assoc_id;
2299 * struct sockaddr_storage spp_address;
2300 * uint32_t spp_hbinterval;
2301 * uint16_t spp_pathmaxrxt;
2302 * uint32_t spp_pathmtu;
2303 * uint32_t spp_sackdelay;
2304 * uint32_t spp_flags;
2305 * uint32_t spp_ipv6_flowlabel;
2306 * uint8_t spp_dscp;
2307 * };
2308 *
2309 * spp_assoc_id - (one-to-many style socket) This is filled in the
2310 * application, and identifies the association for
2311 * this query.
2312 * spp_address - This specifies which address is of interest.
2313 * spp_hbinterval - This contains the value of the heartbeat interval,
2314 * in milliseconds. If a value of zero
2315 * is present in this field then no changes are to
2316 * be made to this parameter.
2317 * spp_pathmaxrxt - This contains the maximum number of
2318 * retransmissions before this address shall be
2319 * considered unreachable. If a value of zero
2320 * is present in this field then no changes are to
2321 * be made to this parameter.
2322 * spp_pathmtu - When Path MTU discovery is disabled the value
2323 * specified here will be the "fixed" path mtu.
2324 * Note that if the spp_address field is empty
2325 * then all associations on this address will
2326 * have this fixed path mtu set upon them.
2327 *
2328 * spp_sackdelay - When delayed sack is enabled, this value specifies
2329 * the number of milliseconds that sacks will be delayed
2330 * for. This value will apply to all addresses of an
2331 * association if the spp_address field is empty. Note
2332 * also, that if delayed sack is enabled and this
2333 * value is set to 0, no change is made to the last
2334 * recorded delayed sack timer value.
2335 *
2336 * spp_flags - These flags are used to control various features
2337 * on an association. The flag field may contain
2338 * zero or more of the following options.
2339 *
2340 * SPP_HB_ENABLE - Enable heartbeats on the
2341 * specified address. Note that if the address
2342 * field is empty all addresses for the association
2343 * have heartbeats enabled upon them.
2344 *
2345 * SPP_HB_DISABLE - Disable heartbeats on the
2346 * speicifed address. Note that if the address
2347 * field is empty all addresses for the association
2348 * will have their heartbeats disabled. Note also
2349 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
2350 * mutually exclusive, only one of these two should
2351 * be specified. Enabling both fields will have
2352 * undetermined results.
2353 *
2354 * SPP_HB_DEMAND - Request a user initiated heartbeat
2355 * to be made immediately.
2356 *
2357 * SPP_HB_TIME_IS_ZERO - Specify's that the time for
2358 * heartbeat delayis to be set to the value of 0
2359 * milliseconds.
2360 *
2361 * SPP_PMTUD_ENABLE - This field will enable PMTU
2362 * discovery upon the specified address. Note that
2363 * if the address feild is empty then all addresses
2364 * on the association are effected.
2365 *
2366 * SPP_PMTUD_DISABLE - This field will disable PMTU
2367 * discovery upon the specified address. Note that
2368 * if the address feild is empty then all addresses
2369 * on the association are effected. Not also that
2370 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2371 * exclusive. Enabling both will have undetermined
2372 * results.
2373 *
2374 * SPP_SACKDELAY_ENABLE - Setting this flag turns
2375 * on delayed sack. The time specified in spp_sackdelay
2376 * is used to specify the sack delay for this address. Note
2377 * that if spp_address is empty then all addresses will
2378 * enable delayed sack and take on the sack delay
2379 * value specified in spp_sackdelay.
2380 * SPP_SACKDELAY_DISABLE - Setting this flag turns
2381 * off delayed sack. If the spp_address field is blank then
2382 * delayed sack is disabled for the entire association. Note
2383 * also that this field is mutually exclusive to
2384 * SPP_SACKDELAY_ENABLE, setting both will have undefined
2385 * results.
2386 *
2387 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
2388 * setting of the IPV6 flow label value. The value is
2389 * contained in the spp_ipv6_flowlabel field.
2390 * Upon retrieval, this flag will be set to indicate that
2391 * the spp_ipv6_flowlabel field has a valid value returned.
2392 * If a specific destination address is set (in the
2393 * spp_address field), then the value returned is that of
2394 * the address. If just an association is specified (and
2395 * no address), then the association's default flow label
2396 * is returned. If neither an association nor a destination
2397 * is specified, then the socket's default flow label is
2398 * returned. For non-IPv6 sockets, this flag will be left
2399 * cleared.
2400 *
2401 * SPP_DSCP: Setting this flag enables the setting of the
2402 * Differentiated Services Code Point (DSCP) value
2403 * associated with either the association or a specific
2404 * address. The value is obtained in the spp_dscp field.
2405 * Upon retrieval, this flag will be set to indicate that
2406 * the spp_dscp field has a valid value returned. If a
2407 * specific destination address is set when called (in the
2408 * spp_address field), then that specific destination
2409 * address's DSCP value is returned. If just an association
2410 * is specified, then the association's default DSCP is
2411 * returned. If neither an association nor a destination is
2412 * specified, then the socket's default DSCP is returned.
2413 *
2414 * spp_ipv6_flowlabel
2415 * - This field is used in conjunction with the
2416 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2417 * The 20 least significant bits are used for the flow
2418 * label. This setting has precedence over any IPv6-layer
2419 * setting.
2420 *
2421 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
2422 * and contains the DSCP. The 6 most significant bits are
2423 * used for the DSCP. This setting has precedence over any
2424 * IPv4- or IPv6- layer setting.
2425 */
sctp_apply_peer_addr_params(struct sctp_paddrparams * params,struct sctp_transport * trans,struct sctp_association * asoc,struct sctp_sock * sp,int hb_change,int pmtud_change,int sackdelay_change)2426 static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2427 struct sctp_transport *trans,
2428 struct sctp_association *asoc,
2429 struct sctp_sock *sp,
2430 int hb_change,
2431 int pmtud_change,
2432 int sackdelay_change)
2433 {
2434 int error;
2435
2436 if (params->spp_flags & SPP_HB_DEMAND && trans) {
2437 error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2438 trans->asoc, trans);
2439 if (error)
2440 return error;
2441 }
2442
2443 /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2444 * this field is ignored. Note also that a value of zero indicates
2445 * the current setting should be left unchanged.
2446 */
2447 if (params->spp_flags & SPP_HB_ENABLE) {
2448
2449 /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2450 * set. This lets us use 0 value when this flag
2451 * is set.
2452 */
2453 if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2454 params->spp_hbinterval = 0;
2455
2456 if (params->spp_hbinterval ||
2457 (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2458 if (trans) {
2459 trans->hbinterval =
2460 msecs_to_jiffies(params->spp_hbinterval);
2461 sctp_transport_reset_hb_timer(trans);
2462 } else if (asoc) {
2463 asoc->hbinterval =
2464 msecs_to_jiffies(params->spp_hbinterval);
2465 } else {
2466 sp->hbinterval = params->spp_hbinterval;
2467 }
2468 }
2469 }
2470
2471 if (hb_change) {
2472 if (trans) {
2473 trans->param_flags =
2474 (trans->param_flags & ~SPP_HB) | hb_change;
2475 } else if (asoc) {
2476 asoc->param_flags =
2477 (asoc->param_flags & ~SPP_HB) | hb_change;
2478 } else {
2479 sp->param_flags =
2480 (sp->param_flags & ~SPP_HB) | hb_change;
2481 }
2482 }
2483
2484 /* When Path MTU discovery is disabled the value specified here will
2485 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2486 * include the flag SPP_PMTUD_DISABLE for this field to have any
2487 * effect).
2488 */
2489 if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2490 if (trans) {
2491 trans->pathmtu = params->spp_pathmtu;
2492 sctp_assoc_sync_pmtu(asoc);
2493 } else if (asoc) {
2494 sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2495 } else {
2496 sp->pathmtu = params->spp_pathmtu;
2497 }
2498 }
2499
2500 if (pmtud_change) {
2501 if (trans) {
2502 int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2503 (params->spp_flags & SPP_PMTUD_ENABLE);
2504 trans->param_flags =
2505 (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2506 if (update) {
2507 sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2508 sctp_assoc_sync_pmtu(asoc);
2509 }
2510 sctp_transport_pl_reset(trans);
2511 } else if (asoc) {
2512 asoc->param_flags =
2513 (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2514 } else {
2515 sp->param_flags =
2516 (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2517 }
2518 }
2519
2520 /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2521 * value of this field is ignored. Note also that a value of zero
2522 * indicates the current setting should be left unchanged.
2523 */
2524 if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2525 if (trans) {
2526 trans->sackdelay =
2527 msecs_to_jiffies(params->spp_sackdelay);
2528 } else if (asoc) {
2529 asoc->sackdelay =
2530 msecs_to_jiffies(params->spp_sackdelay);
2531 } else {
2532 sp->sackdelay = params->spp_sackdelay;
2533 }
2534 }
2535
2536 if (sackdelay_change) {
2537 if (trans) {
2538 trans->param_flags =
2539 (trans->param_flags & ~SPP_SACKDELAY) |
2540 sackdelay_change;
2541 } else if (asoc) {
2542 asoc->param_flags =
2543 (asoc->param_flags & ~SPP_SACKDELAY) |
2544 sackdelay_change;
2545 } else {
2546 sp->param_flags =
2547 (sp->param_flags & ~SPP_SACKDELAY) |
2548 sackdelay_change;
2549 }
2550 }
2551
2552 /* Note that a value of zero indicates the current setting should be
2553 left unchanged.
2554 */
2555 if (params->spp_pathmaxrxt) {
2556 if (trans) {
2557 trans->pathmaxrxt = params->spp_pathmaxrxt;
2558 } else if (asoc) {
2559 asoc->pathmaxrxt = params->spp_pathmaxrxt;
2560 } else {
2561 sp->pathmaxrxt = params->spp_pathmaxrxt;
2562 }
2563 }
2564
2565 if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2566 if (trans) {
2567 if (trans->ipaddr.sa.sa_family == AF_INET6) {
2568 trans->flowlabel = params->spp_ipv6_flowlabel &
2569 SCTP_FLOWLABEL_VAL_MASK;
2570 trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571 }
2572 } else if (asoc) {
2573 struct sctp_transport *t;
2574
2575 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2576 transports) {
2577 if (t->ipaddr.sa.sa_family != AF_INET6)
2578 continue;
2579 t->flowlabel = params->spp_ipv6_flowlabel &
2580 SCTP_FLOWLABEL_VAL_MASK;
2581 t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2582 }
2583 asoc->flowlabel = params->spp_ipv6_flowlabel &
2584 SCTP_FLOWLABEL_VAL_MASK;
2585 asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2586 } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2587 sp->flowlabel = params->spp_ipv6_flowlabel &
2588 SCTP_FLOWLABEL_VAL_MASK;
2589 sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2590 }
2591 }
2592
2593 if (params->spp_flags & SPP_DSCP) {
2594 if (trans) {
2595 trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596 trans->dscp |= SCTP_DSCP_SET_MASK;
2597 } else if (asoc) {
2598 struct sctp_transport *t;
2599
2600 list_for_each_entry(t, &asoc->peer.transport_addr_list,
2601 transports) {
2602 t->dscp = params->spp_dscp &
2603 SCTP_DSCP_VAL_MASK;
2604 t->dscp |= SCTP_DSCP_SET_MASK;
2605 }
2606 asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2607 asoc->dscp |= SCTP_DSCP_SET_MASK;
2608 } else {
2609 sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2610 sp->dscp |= SCTP_DSCP_SET_MASK;
2611 }
2612 }
2613
2614 return 0;
2615 }
2616
sctp_setsockopt_peer_addr_params(struct sock * sk,struct sctp_paddrparams * params,unsigned int optlen)2617 static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2618 struct sctp_paddrparams *params,
2619 unsigned int optlen)
2620 {
2621 struct sctp_transport *trans = NULL;
2622 struct sctp_association *asoc = NULL;
2623 struct sctp_sock *sp = sctp_sk(sk);
2624 int error;
2625 int hb_change, pmtud_change, sackdelay_change;
2626
2627 if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2628 spp_ipv6_flowlabel), 4)) {
2629 if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2630 return -EINVAL;
2631 } else if (optlen != sizeof(*params)) {
2632 return -EINVAL;
2633 }
2634
2635 /* Validate flags and value parameters. */
2636 hb_change = params->spp_flags & SPP_HB;
2637 pmtud_change = params->spp_flags & SPP_PMTUD;
2638 sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2639
2640 if (hb_change == SPP_HB ||
2641 pmtud_change == SPP_PMTUD ||
2642 sackdelay_change == SPP_SACKDELAY ||
2643 params->spp_sackdelay > 500 ||
2644 (params->spp_pathmtu &&
2645 params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2646 return -EINVAL;
2647
2648 /* If an address other than INADDR_ANY is specified, and
2649 * no transport is found, then the request is invalid.
2650 */
2651 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spp_address)) {
2652 trans = sctp_addr_id2transport(sk, ¶ms->spp_address,
2653 params->spp_assoc_id);
2654 if (!trans)
2655 return -EINVAL;
2656 }
2657
2658 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2659 * socket is a one to many style socket, and an association
2660 * was not found, then the id was invalid.
2661 */
2662 asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2663 if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2664 sctp_style(sk, UDP))
2665 return -EINVAL;
2666
2667 /* Heartbeat demand can only be sent on a transport or
2668 * association, but not a socket.
2669 */
2670 if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2671 return -EINVAL;
2672
2673 /* Process parameters. */
2674 error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2675 hb_change, pmtud_change,
2676 sackdelay_change);
2677
2678 if (error)
2679 return error;
2680
2681 /* If changes are for association, also apply parameters to each
2682 * transport.
2683 */
2684 if (!trans && asoc) {
2685 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2686 transports) {
2687 sctp_apply_peer_addr_params(params, trans, asoc, sp,
2688 hb_change, pmtud_change,
2689 sackdelay_change);
2690 }
2691 }
2692
2693 return 0;
2694 }
2695
sctp_spp_sackdelay_enable(__u32 param_flags)2696 static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2697 {
2698 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2699 }
2700
sctp_spp_sackdelay_disable(__u32 param_flags)2701 static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2702 {
2703 return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2704 }
2705
sctp_apply_asoc_delayed_ack(struct sctp_sack_info * params,struct sctp_association * asoc)2706 static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2707 struct sctp_association *asoc)
2708 {
2709 struct sctp_transport *trans;
2710
2711 if (params->sack_delay) {
2712 asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2713 asoc->param_flags =
2714 sctp_spp_sackdelay_enable(asoc->param_flags);
2715 }
2716 if (params->sack_freq == 1) {
2717 asoc->param_flags =
2718 sctp_spp_sackdelay_disable(asoc->param_flags);
2719 } else if (params->sack_freq > 1) {
2720 asoc->sackfreq = params->sack_freq;
2721 asoc->param_flags =
2722 sctp_spp_sackdelay_enable(asoc->param_flags);
2723 }
2724
2725 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2726 transports) {
2727 if (params->sack_delay) {
2728 trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2729 trans->param_flags =
2730 sctp_spp_sackdelay_enable(trans->param_flags);
2731 }
2732 if (params->sack_freq == 1) {
2733 trans->param_flags =
2734 sctp_spp_sackdelay_disable(trans->param_flags);
2735 } else if (params->sack_freq > 1) {
2736 trans->sackfreq = params->sack_freq;
2737 trans->param_flags =
2738 sctp_spp_sackdelay_enable(trans->param_flags);
2739 }
2740 }
2741 }
2742
2743 /*
2744 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
2745 *
2746 * This option will effect the way delayed acks are performed. This
2747 * option allows you to get or set the delayed ack time, in
2748 * milliseconds. It also allows changing the delayed ack frequency.
2749 * Changing the frequency to 1 disables the delayed sack algorithm. If
2750 * the assoc_id is 0, then this sets or gets the endpoints default
2751 * values. If the assoc_id field is non-zero, then the set or get
2752 * effects the specified association for the one to many model (the
2753 * assoc_id field is ignored by the one to one model). Note that if
2754 * sack_delay or sack_freq are 0 when setting this option, then the
2755 * current values will remain unchanged.
2756 *
2757 * struct sctp_sack_info {
2758 * sctp_assoc_t sack_assoc_id;
2759 * uint32_t sack_delay;
2760 * uint32_t sack_freq;
2761 * };
2762 *
2763 * sack_assoc_id - This parameter, indicates which association the user
2764 * is performing an action upon. Note that if this field's value is
2765 * zero then the endpoints default value is changed (effecting future
2766 * associations only).
2767 *
2768 * sack_delay - This parameter contains the number of milliseconds that
2769 * the user is requesting the delayed ACK timer be set to. Note that
2770 * this value is defined in the standard to be between 200 and 500
2771 * milliseconds.
2772 *
2773 * sack_freq - This parameter contains the number of packets that must
2774 * be received before a sack is sent without waiting for the delay
2775 * timer to expire. The default value for this is 2, setting this
2776 * value to 1 will disable the delayed sack algorithm.
2777 */
__sctp_setsockopt_delayed_ack(struct sock * sk,struct sctp_sack_info * params)2778 static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2779 struct sctp_sack_info *params)
2780 {
2781 struct sctp_sock *sp = sctp_sk(sk);
2782 struct sctp_association *asoc;
2783
2784 /* Validate value parameter. */
2785 if (params->sack_delay > 500)
2786 return -EINVAL;
2787
2788 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2789 * socket is a one to many style socket, and an association
2790 * was not found, then the id was invalid.
2791 */
2792 asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2793 if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2794 sctp_style(sk, UDP))
2795 return -EINVAL;
2796
2797 if (asoc) {
2798 sctp_apply_asoc_delayed_ack(params, asoc);
2799
2800 return 0;
2801 }
2802
2803 if (sctp_style(sk, TCP))
2804 params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2805
2806 if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2807 params->sack_assoc_id == SCTP_ALL_ASSOC) {
2808 if (params->sack_delay) {
2809 sp->sackdelay = params->sack_delay;
2810 sp->param_flags =
2811 sctp_spp_sackdelay_enable(sp->param_flags);
2812 }
2813 if (params->sack_freq == 1) {
2814 sp->param_flags =
2815 sctp_spp_sackdelay_disable(sp->param_flags);
2816 } else if (params->sack_freq > 1) {
2817 sp->sackfreq = params->sack_freq;
2818 sp->param_flags =
2819 sctp_spp_sackdelay_enable(sp->param_flags);
2820 }
2821 }
2822
2823 if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2824 params->sack_assoc_id == SCTP_ALL_ASSOC)
2825 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2826 sctp_apply_asoc_delayed_ack(params, asoc);
2827
2828 return 0;
2829 }
2830
sctp_setsockopt_delayed_ack(struct sock * sk,struct sctp_sack_info * params,unsigned int optlen)2831 static int sctp_setsockopt_delayed_ack(struct sock *sk,
2832 struct sctp_sack_info *params,
2833 unsigned int optlen)
2834 {
2835 if (optlen == sizeof(struct sctp_assoc_value)) {
2836 struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2837 struct sctp_sack_info p;
2838
2839 pr_warn_ratelimited(DEPRECATED
2840 "%s (pid %d) "
2841 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2842 "Use struct sctp_sack_info instead\n",
2843 current->comm, task_pid_nr(current));
2844
2845 p.sack_assoc_id = v->assoc_id;
2846 p.sack_delay = v->assoc_value;
2847 p.sack_freq = v->assoc_value ? 0 : 1;
2848 return __sctp_setsockopt_delayed_ack(sk, &p);
2849 }
2850
2851 if (optlen != sizeof(struct sctp_sack_info))
2852 return -EINVAL;
2853 if (params->sack_delay == 0 && params->sack_freq == 0)
2854 return 0;
2855 return __sctp_setsockopt_delayed_ack(sk, params);
2856 }
2857
2858 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2859 *
2860 * Applications can specify protocol parameters for the default association
2861 * initialization. The option name argument to setsockopt() and getsockopt()
2862 * is SCTP_INITMSG.
2863 *
2864 * Setting initialization parameters is effective only on an unconnected
2865 * socket (for UDP-style sockets only future associations are effected
2866 * by the change). With TCP-style sockets, this option is inherited by
2867 * sockets derived from a listener socket.
2868 */
sctp_setsockopt_initmsg(struct sock * sk,struct sctp_initmsg * sinit,unsigned int optlen)2869 static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2870 unsigned int optlen)
2871 {
2872 struct sctp_sock *sp = sctp_sk(sk);
2873
2874 if (optlen != sizeof(struct sctp_initmsg))
2875 return -EINVAL;
2876
2877 if (sinit->sinit_num_ostreams)
2878 sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2879 if (sinit->sinit_max_instreams)
2880 sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2881 if (sinit->sinit_max_attempts)
2882 sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2883 if (sinit->sinit_max_init_timeo)
2884 sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2885
2886 return 0;
2887 }
2888
2889 /*
2890 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2891 *
2892 * Applications that wish to use the sendto() system call may wish to
2893 * specify a default set of parameters that would normally be supplied
2894 * through the inclusion of ancillary data. This socket option allows
2895 * such an application to set the default sctp_sndrcvinfo structure.
2896 * The application that wishes to use this socket option simply passes
2897 * in to this call the sctp_sndrcvinfo structure defined in Section
2898 * 5.2.2) The input parameters accepted by this call include
2899 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2900 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
2901 * to this call if the caller is using the UDP model.
2902 */
sctp_setsockopt_default_send_param(struct sock * sk,struct sctp_sndrcvinfo * info,unsigned int optlen)2903 static int sctp_setsockopt_default_send_param(struct sock *sk,
2904 struct sctp_sndrcvinfo *info,
2905 unsigned int optlen)
2906 {
2907 struct sctp_sock *sp = sctp_sk(sk);
2908 struct sctp_association *asoc;
2909
2910 if (optlen != sizeof(*info))
2911 return -EINVAL;
2912 if (info->sinfo_flags &
2913 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2914 SCTP_ABORT | SCTP_EOF))
2915 return -EINVAL;
2916
2917 asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2918 if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2919 sctp_style(sk, UDP))
2920 return -EINVAL;
2921
2922 if (asoc) {
2923 asoc->default_stream = info->sinfo_stream;
2924 asoc->default_flags = info->sinfo_flags;
2925 asoc->default_ppid = info->sinfo_ppid;
2926 asoc->default_context = info->sinfo_context;
2927 asoc->default_timetolive = info->sinfo_timetolive;
2928
2929 return 0;
2930 }
2931
2932 if (sctp_style(sk, TCP))
2933 info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2934
2935 if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2936 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2937 sp->default_stream = info->sinfo_stream;
2938 sp->default_flags = info->sinfo_flags;
2939 sp->default_ppid = info->sinfo_ppid;
2940 sp->default_context = info->sinfo_context;
2941 sp->default_timetolive = info->sinfo_timetolive;
2942 }
2943
2944 if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2945 info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2946 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2947 asoc->default_stream = info->sinfo_stream;
2948 asoc->default_flags = info->sinfo_flags;
2949 asoc->default_ppid = info->sinfo_ppid;
2950 asoc->default_context = info->sinfo_context;
2951 asoc->default_timetolive = info->sinfo_timetolive;
2952 }
2953 }
2954
2955 return 0;
2956 }
2957
2958 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2959 * (SCTP_DEFAULT_SNDINFO)
2960 */
sctp_setsockopt_default_sndinfo(struct sock * sk,struct sctp_sndinfo * info,unsigned int optlen)2961 static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2962 struct sctp_sndinfo *info,
2963 unsigned int optlen)
2964 {
2965 struct sctp_sock *sp = sctp_sk(sk);
2966 struct sctp_association *asoc;
2967
2968 if (optlen != sizeof(*info))
2969 return -EINVAL;
2970 if (info->snd_flags &
2971 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2972 SCTP_ABORT | SCTP_EOF))
2973 return -EINVAL;
2974
2975 asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2976 if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2977 sctp_style(sk, UDP))
2978 return -EINVAL;
2979
2980 if (asoc) {
2981 asoc->default_stream = info->snd_sid;
2982 asoc->default_flags = info->snd_flags;
2983 asoc->default_ppid = info->snd_ppid;
2984 asoc->default_context = info->snd_context;
2985
2986 return 0;
2987 }
2988
2989 if (sctp_style(sk, TCP))
2990 info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2991
2992 if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2993 info->snd_assoc_id == SCTP_ALL_ASSOC) {
2994 sp->default_stream = info->snd_sid;
2995 sp->default_flags = info->snd_flags;
2996 sp->default_ppid = info->snd_ppid;
2997 sp->default_context = info->snd_context;
2998 }
2999
3000 if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
3001 info->snd_assoc_id == SCTP_ALL_ASSOC) {
3002 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
3003 asoc->default_stream = info->snd_sid;
3004 asoc->default_flags = info->snd_flags;
3005 asoc->default_ppid = info->snd_ppid;
3006 asoc->default_context = info->snd_context;
3007 }
3008 }
3009
3010 return 0;
3011 }
3012
3013 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3014 *
3015 * Requests that the local SCTP stack use the enclosed peer address as
3016 * the association primary. The enclosed address must be one of the
3017 * association peer's addresses.
3018 */
sctp_setsockopt_primary_addr(struct sock * sk,struct sctp_prim * prim,unsigned int optlen)3019 static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3020 unsigned int optlen)
3021 {
3022 struct sctp_transport *trans;
3023 struct sctp_af *af;
3024 int err;
3025
3026 if (optlen != sizeof(struct sctp_prim))
3027 return -EINVAL;
3028
3029 /* Allow security module to validate address but need address len. */
3030 af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3031 if (!af)
3032 return -EINVAL;
3033
3034 err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3035 (struct sockaddr *)&prim->ssp_addr,
3036 af->sockaddr_len);
3037 if (err)
3038 return err;
3039
3040 trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3041 if (!trans)
3042 return -EINVAL;
3043
3044 sctp_assoc_set_primary(trans->asoc, trans);
3045
3046 return 0;
3047 }
3048
3049 /*
3050 * 7.1.5 SCTP_NODELAY
3051 *
3052 * Turn on/off any Nagle-like algorithm. This means that packets are
3053 * generally sent as soon as possible and no unnecessary delays are
3054 * introduced, at the cost of more packets in the network. Expects an
3055 * integer boolean flag.
3056 */
sctp_setsockopt_nodelay(struct sock * sk,int * val,unsigned int optlen)3057 static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3058 unsigned int optlen)
3059 {
3060 if (optlen < sizeof(int))
3061 return -EINVAL;
3062 sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3063 return 0;
3064 }
3065
3066 /*
3067 *
3068 * 7.1.1 SCTP_RTOINFO
3069 *
3070 * The protocol parameters used to initialize and bound retransmission
3071 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3072 * and modify these parameters.
3073 * All parameters are time values, in milliseconds. A value of 0, when
3074 * modifying the parameters, indicates that the current value should not
3075 * be changed.
3076 *
3077 */
sctp_setsockopt_rtoinfo(struct sock * sk,struct sctp_rtoinfo * rtoinfo,unsigned int optlen)3078 static int sctp_setsockopt_rtoinfo(struct sock *sk,
3079 struct sctp_rtoinfo *rtoinfo,
3080 unsigned int optlen)
3081 {
3082 struct sctp_association *asoc;
3083 unsigned long rto_min, rto_max;
3084 struct sctp_sock *sp = sctp_sk(sk);
3085
3086 if (optlen != sizeof (struct sctp_rtoinfo))
3087 return -EINVAL;
3088
3089 asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3090
3091 /* Set the values to the specific association */
3092 if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3093 sctp_style(sk, UDP))
3094 return -EINVAL;
3095
3096 rto_max = rtoinfo->srto_max;
3097 rto_min = rtoinfo->srto_min;
3098
3099 if (rto_max)
3100 rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3101 else
3102 rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3103
3104 if (rto_min)
3105 rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3106 else
3107 rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3108
3109 if (rto_min > rto_max)
3110 return -EINVAL;
3111
3112 if (asoc) {
3113 if (rtoinfo->srto_initial != 0)
3114 asoc->rto_initial =
3115 msecs_to_jiffies(rtoinfo->srto_initial);
3116 asoc->rto_max = rto_max;
3117 asoc->rto_min = rto_min;
3118 } else {
3119 /* If there is no association or the association-id = 0
3120 * set the values to the endpoint.
3121 */
3122 if (rtoinfo->srto_initial != 0)
3123 sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3124 sp->rtoinfo.srto_max = rto_max;
3125 sp->rtoinfo.srto_min = rto_min;
3126 }
3127
3128 return 0;
3129 }
3130
3131 /*
3132 *
3133 * 7.1.2 SCTP_ASSOCINFO
3134 *
3135 * This option is used to tune the maximum retransmission attempts
3136 * of the association.
3137 * Returns an error if the new association retransmission value is
3138 * greater than the sum of the retransmission value of the peer.
3139 * See [SCTP] for more information.
3140 *
3141 */
sctp_setsockopt_associnfo(struct sock * sk,struct sctp_assocparams * assocparams,unsigned int optlen)3142 static int sctp_setsockopt_associnfo(struct sock *sk,
3143 struct sctp_assocparams *assocparams,
3144 unsigned int optlen)
3145 {
3146
3147 struct sctp_association *asoc;
3148
3149 if (optlen != sizeof(struct sctp_assocparams))
3150 return -EINVAL;
3151
3152 asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3153
3154 if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3155 sctp_style(sk, UDP))
3156 return -EINVAL;
3157
3158 /* Set the values to the specific association */
3159 if (asoc) {
3160 if (assocparams->sasoc_asocmaxrxt != 0) {
3161 __u32 path_sum = 0;
3162 int paths = 0;
3163 struct sctp_transport *peer_addr;
3164
3165 list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3166 transports) {
3167 path_sum += peer_addr->pathmaxrxt;
3168 paths++;
3169 }
3170
3171 /* Only validate asocmaxrxt if we have more than
3172 * one path/transport. We do this because path
3173 * retransmissions are only counted when we have more
3174 * then one path.
3175 */
3176 if (paths > 1 &&
3177 assocparams->sasoc_asocmaxrxt > path_sum)
3178 return -EINVAL;
3179
3180 asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3181 }
3182
3183 if (assocparams->sasoc_cookie_life != 0)
3184 asoc->cookie_life =
3185 ms_to_ktime(assocparams->sasoc_cookie_life);
3186 } else {
3187 /* Set the values to the endpoint */
3188 struct sctp_sock *sp = sctp_sk(sk);
3189
3190 if (assocparams->sasoc_asocmaxrxt != 0)
3191 sp->assocparams.sasoc_asocmaxrxt =
3192 assocparams->sasoc_asocmaxrxt;
3193 if (assocparams->sasoc_cookie_life != 0)
3194 sp->assocparams.sasoc_cookie_life =
3195 assocparams->sasoc_cookie_life;
3196 }
3197 return 0;
3198 }
3199
3200 /*
3201 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3202 *
3203 * This socket option is a boolean flag which turns on or off mapped V4
3204 * addresses. If this option is turned on and the socket is type
3205 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3206 * If this option is turned off, then no mapping will be done of V4
3207 * addresses and a user will receive both PF_INET6 and PF_INET type
3208 * addresses on the socket.
3209 */
sctp_setsockopt_mappedv4(struct sock * sk,int * val,unsigned int optlen)3210 static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3211 unsigned int optlen)
3212 {
3213 struct sctp_sock *sp = sctp_sk(sk);
3214
3215 if (optlen < sizeof(int))
3216 return -EINVAL;
3217 if (*val)
3218 sp->v4mapped = 1;
3219 else
3220 sp->v4mapped = 0;
3221
3222 return 0;
3223 }
3224
3225 /*
3226 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3227 * This option will get or set the maximum size to put in any outgoing
3228 * SCTP DATA chunk. If a message is larger than this size it will be
3229 * fragmented by SCTP into the specified size. Note that the underlying
3230 * SCTP implementation may fragment into smaller sized chunks when the
3231 * PMTU of the underlying association is smaller than the value set by
3232 * the user. The default value for this option is '0' which indicates
3233 * the user is NOT limiting fragmentation and only the PMTU will effect
3234 * SCTP's choice of DATA chunk size. Note also that values set larger
3235 * than the maximum size of an IP datagram will effectively let SCTP
3236 * control fragmentation (i.e. the same as setting this option to 0).
3237 *
3238 * The following structure is used to access and modify this parameter:
3239 *
3240 * struct sctp_assoc_value {
3241 * sctp_assoc_t assoc_id;
3242 * uint32_t assoc_value;
3243 * };
3244 *
3245 * assoc_id: This parameter is ignored for one-to-one style sockets.
3246 * For one-to-many style sockets this parameter indicates which
3247 * association the user is performing an action upon. Note that if
3248 * this field's value is zero then the endpoints default value is
3249 * changed (effecting future associations only).
3250 * assoc_value: This parameter specifies the maximum size in bytes.
3251 */
sctp_setsockopt_maxseg(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)3252 static int sctp_setsockopt_maxseg(struct sock *sk,
3253 struct sctp_assoc_value *params,
3254 unsigned int optlen)
3255 {
3256 struct sctp_sock *sp = sctp_sk(sk);
3257 struct sctp_association *asoc;
3258 sctp_assoc_t assoc_id;
3259 int val;
3260
3261 if (optlen == sizeof(int)) {
3262 pr_warn_ratelimited(DEPRECATED
3263 "%s (pid %d) "
3264 "Use of int in maxseg socket option.\n"
3265 "Use struct sctp_assoc_value instead\n",
3266 current->comm, task_pid_nr(current));
3267 assoc_id = SCTP_FUTURE_ASSOC;
3268 val = *(int *)params;
3269 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3270 assoc_id = params->assoc_id;
3271 val = params->assoc_value;
3272 } else {
3273 return -EINVAL;
3274 }
3275
3276 asoc = sctp_id2assoc(sk, assoc_id);
3277 if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3278 sctp_style(sk, UDP))
3279 return -EINVAL;
3280
3281 if (val) {
3282 int min_len, max_len;
3283 __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3284 sizeof(struct sctp_data_chunk);
3285
3286 min_len = sctp_min_frag_point(sp, datasize);
3287 max_len = SCTP_MAX_CHUNK_LEN - datasize;
3288
3289 if (val < min_len || val > max_len)
3290 return -EINVAL;
3291 }
3292
3293 if (asoc) {
3294 asoc->user_frag = val;
3295 sctp_assoc_update_frag_point(asoc);
3296 } else {
3297 sp->user_frag = val;
3298 }
3299
3300 return 0;
3301 }
3302
3303
3304 /*
3305 * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3306 *
3307 * Requests that the peer mark the enclosed address as the association
3308 * primary. The enclosed address must be one of the association's
3309 * locally bound addresses. The following structure is used to make a
3310 * set primary request:
3311 */
sctp_setsockopt_peer_primary_addr(struct sock * sk,struct sctp_setpeerprim * prim,unsigned int optlen)3312 static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3313 struct sctp_setpeerprim *prim,
3314 unsigned int optlen)
3315 {
3316 struct sctp_sock *sp;
3317 struct sctp_association *asoc = NULL;
3318 struct sctp_chunk *chunk;
3319 struct sctp_af *af;
3320 int err;
3321
3322 sp = sctp_sk(sk);
3323
3324 if (!sp->ep->asconf_enable)
3325 return -EPERM;
3326
3327 if (optlen != sizeof(struct sctp_setpeerprim))
3328 return -EINVAL;
3329
3330 asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3331 if (!asoc)
3332 return -EINVAL;
3333
3334 if (!asoc->peer.asconf_capable)
3335 return -EPERM;
3336
3337 if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3338 return -EPERM;
3339
3340 if (!sctp_state(asoc, ESTABLISHED))
3341 return -ENOTCONN;
3342
3343 af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3344 if (!af)
3345 return -EINVAL;
3346
3347 if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3348 return -EADDRNOTAVAIL;
3349
3350 if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3351 return -EADDRNOTAVAIL;
3352
3353 /* Allow security module to validate address. */
3354 err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3355 (struct sockaddr *)&prim->sspp_addr,
3356 af->sockaddr_len);
3357 if (err)
3358 return err;
3359
3360 /* Create an ASCONF chunk with SET_PRIMARY parameter */
3361 chunk = sctp_make_asconf_set_prim(asoc,
3362 (union sctp_addr *)&prim->sspp_addr);
3363 if (!chunk)
3364 return -ENOMEM;
3365
3366 err = sctp_send_asconf(asoc, chunk);
3367
3368 pr_debug("%s: we set peer primary addr primitively\n", __func__);
3369
3370 return err;
3371 }
3372
sctp_setsockopt_adaptation_layer(struct sock * sk,struct sctp_setadaptation * adapt,unsigned int optlen)3373 static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3374 struct sctp_setadaptation *adapt,
3375 unsigned int optlen)
3376 {
3377 if (optlen != sizeof(struct sctp_setadaptation))
3378 return -EINVAL;
3379
3380 sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3381
3382 return 0;
3383 }
3384
3385 /*
3386 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
3387 *
3388 * The context field in the sctp_sndrcvinfo structure is normally only
3389 * used when a failed message is retrieved holding the value that was
3390 * sent down on the actual send call. This option allows the setting of
3391 * a default context on an association basis that will be received on
3392 * reading messages from the peer. This is especially helpful in the
3393 * one-2-many model for an application to keep some reference to an
3394 * internal state machine that is processing messages on the
3395 * association. Note that the setting of this value only effects
3396 * received messages from the peer and does not effect the value that is
3397 * saved with outbound messages.
3398 */
sctp_setsockopt_context(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)3399 static int sctp_setsockopt_context(struct sock *sk,
3400 struct sctp_assoc_value *params,
3401 unsigned int optlen)
3402 {
3403 struct sctp_sock *sp = sctp_sk(sk);
3404 struct sctp_association *asoc;
3405
3406 if (optlen != sizeof(struct sctp_assoc_value))
3407 return -EINVAL;
3408
3409 asoc = sctp_id2assoc(sk, params->assoc_id);
3410 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3411 sctp_style(sk, UDP))
3412 return -EINVAL;
3413
3414 if (asoc) {
3415 asoc->default_rcv_context = params->assoc_value;
3416
3417 return 0;
3418 }
3419
3420 if (sctp_style(sk, TCP))
3421 params->assoc_id = SCTP_FUTURE_ASSOC;
3422
3423 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3424 params->assoc_id == SCTP_ALL_ASSOC)
3425 sp->default_rcv_context = params->assoc_value;
3426
3427 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3428 params->assoc_id == SCTP_ALL_ASSOC)
3429 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3430 asoc->default_rcv_context = params->assoc_value;
3431
3432 return 0;
3433 }
3434
3435 /*
3436 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3437 *
3438 * This options will at a minimum specify if the implementation is doing
3439 * fragmented interleave. Fragmented interleave, for a one to many
3440 * socket, is when subsequent calls to receive a message may return
3441 * parts of messages from different associations. Some implementations
3442 * may allow you to turn this value on or off. If so, when turned off,
3443 * no fragment interleave will occur (which will cause a head of line
3444 * blocking amongst multiple associations sharing the same one to many
3445 * socket). When this option is turned on, then each receive call may
3446 * come from a different association (thus the user must receive data
3447 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3448 * association each receive belongs to.
3449 *
3450 * This option takes a boolean value. A non-zero value indicates that
3451 * fragmented interleave is on. A value of zero indicates that
3452 * fragmented interleave is off.
3453 *
3454 * Note that it is important that an implementation that allows this
3455 * option to be turned on, have it off by default. Otherwise an unaware
3456 * application using the one to many model may become confused and act
3457 * incorrectly.
3458 */
sctp_setsockopt_fragment_interleave(struct sock * sk,int * val,unsigned int optlen)3459 static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3460 unsigned int optlen)
3461 {
3462 if (optlen != sizeof(int))
3463 return -EINVAL;
3464
3465 sctp_sk(sk)->frag_interleave = !!*val;
3466
3467 if (!sctp_sk(sk)->frag_interleave)
3468 sctp_sk(sk)->ep->intl_enable = 0;
3469
3470 return 0;
3471 }
3472
3473 /*
3474 * 8.1.21. Set or Get the SCTP Partial Delivery Point
3475 * (SCTP_PARTIAL_DELIVERY_POINT)
3476 *
3477 * This option will set or get the SCTP partial delivery point. This
3478 * point is the size of a message where the partial delivery API will be
3479 * invoked to help free up rwnd space for the peer. Setting this to a
3480 * lower value will cause partial deliveries to happen more often. The
3481 * calls argument is an integer that sets or gets the partial delivery
3482 * point. Note also that the call will fail if the user attempts to set
3483 * this value larger than the socket receive buffer size.
3484 *
3485 * Note that any single message having a length smaller than or equal to
3486 * the SCTP partial delivery point will be delivered in one single read
3487 * call as long as the user provided buffer is large enough to hold the
3488 * message.
3489 */
sctp_setsockopt_partial_delivery_point(struct sock * sk,u32 * val,unsigned int optlen)3490 static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3491 unsigned int optlen)
3492 {
3493 if (optlen != sizeof(u32))
3494 return -EINVAL;
3495
3496 /* Note: We double the receive buffer from what the user sets
3497 * it to be, also initial rwnd is based on rcvbuf/2.
3498 */
3499 if (*val > (sk->sk_rcvbuf >> 1))
3500 return -EINVAL;
3501
3502 sctp_sk(sk)->pd_point = *val;
3503
3504 return 0; /* is this the right error code? */
3505 }
3506
3507 /*
3508 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
3509 *
3510 * This option will allow a user to change the maximum burst of packets
3511 * that can be emitted by this association. Note that the default value
3512 * is 4, and some implementations may restrict this setting so that it
3513 * can only be lowered.
3514 *
3515 * NOTE: This text doesn't seem right. Do this on a socket basis with
3516 * future associations inheriting the socket value.
3517 */
sctp_setsockopt_maxburst(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)3518 static int sctp_setsockopt_maxburst(struct sock *sk,
3519 struct sctp_assoc_value *params,
3520 unsigned int optlen)
3521 {
3522 struct sctp_sock *sp = sctp_sk(sk);
3523 struct sctp_association *asoc;
3524 sctp_assoc_t assoc_id;
3525 u32 assoc_value;
3526
3527 if (optlen == sizeof(int)) {
3528 pr_warn_ratelimited(DEPRECATED
3529 "%s (pid %d) "
3530 "Use of int in max_burst socket option deprecated.\n"
3531 "Use struct sctp_assoc_value instead\n",
3532 current->comm, task_pid_nr(current));
3533 assoc_id = SCTP_FUTURE_ASSOC;
3534 assoc_value = *((int *)params);
3535 } else if (optlen == sizeof(struct sctp_assoc_value)) {
3536 assoc_id = params->assoc_id;
3537 assoc_value = params->assoc_value;
3538 } else
3539 return -EINVAL;
3540
3541 asoc = sctp_id2assoc(sk, assoc_id);
3542 if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3543 return -EINVAL;
3544
3545 if (asoc) {
3546 asoc->max_burst = assoc_value;
3547
3548 return 0;
3549 }
3550
3551 if (sctp_style(sk, TCP))
3552 assoc_id = SCTP_FUTURE_ASSOC;
3553
3554 if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3555 sp->max_burst = assoc_value;
3556
3557 if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3558 list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3559 asoc->max_burst = assoc_value;
3560
3561 return 0;
3562 }
3563
3564 /*
3565 * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3566 *
3567 * This set option adds a chunk type that the user is requesting to be
3568 * received only in an authenticated way. Changes to the list of chunks
3569 * will only effect future associations on the socket.
3570 */
sctp_setsockopt_auth_chunk(struct sock * sk,struct sctp_authchunk * val,unsigned int optlen)3571 static int sctp_setsockopt_auth_chunk(struct sock *sk,
3572 struct sctp_authchunk *val,
3573 unsigned int optlen)
3574 {
3575 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3576
3577 if (!ep->auth_enable)
3578 return -EACCES;
3579
3580 if (optlen != sizeof(struct sctp_authchunk))
3581 return -EINVAL;
3582
3583 switch (val->sauth_chunk) {
3584 case SCTP_CID_INIT:
3585 case SCTP_CID_INIT_ACK:
3586 case SCTP_CID_SHUTDOWN_COMPLETE:
3587 case SCTP_CID_AUTH:
3588 return -EINVAL;
3589 }
3590
3591 /* add this chunk id to the endpoint */
3592 return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3593 }
3594
3595 /*
3596 * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3597 *
3598 * This option gets or sets the list of HMAC algorithms that the local
3599 * endpoint requires the peer to use.
3600 */
sctp_setsockopt_hmac_ident(struct sock * sk,struct sctp_hmacalgo * hmacs,unsigned int optlen)3601 static int sctp_setsockopt_hmac_ident(struct sock *sk,
3602 struct sctp_hmacalgo *hmacs,
3603 unsigned int optlen)
3604 {
3605 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3606 u32 idents;
3607
3608 if (!ep->auth_enable)
3609 return -EACCES;
3610
3611 if (optlen < sizeof(struct sctp_hmacalgo))
3612 return -EINVAL;
3613 optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3614 SCTP_AUTH_NUM_HMACS * sizeof(u16));
3615
3616 idents = hmacs->shmac_num_idents;
3617 if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3618 (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3619 return -EINVAL;
3620
3621 return sctp_auth_ep_set_hmacs(ep, hmacs);
3622 }
3623
3624 /*
3625 * 7.1.20. Set a shared key (SCTP_AUTH_KEY)
3626 *
3627 * This option will set a shared secret key which is used to build an
3628 * association shared key.
3629 */
sctp_setsockopt_auth_key(struct sock * sk,struct sctp_authkey * authkey,unsigned int optlen)3630 static int sctp_setsockopt_auth_key(struct sock *sk,
3631 struct sctp_authkey *authkey,
3632 unsigned int optlen)
3633 {
3634 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3635 struct sctp_association *asoc;
3636 int ret = -EINVAL;
3637
3638 if (optlen <= sizeof(struct sctp_authkey))
3639 return -EINVAL;
3640 /* authkey->sca_keylength is u16, so optlen can't be bigger than
3641 * this.
3642 */
3643 optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3644
3645 if (authkey->sca_keylength > optlen - sizeof(*authkey))
3646 goto out;
3647
3648 asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3649 if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3650 sctp_style(sk, UDP))
3651 goto out;
3652
3653 if (asoc) {
3654 ret = sctp_auth_set_key(ep, asoc, authkey);
3655 goto out;
3656 }
3657
3658 if (sctp_style(sk, TCP))
3659 authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3660
3661 if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3662 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3663 ret = sctp_auth_set_key(ep, asoc, authkey);
3664 if (ret)
3665 goto out;
3666 }
3667
3668 ret = 0;
3669
3670 if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3671 authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3672 list_for_each_entry(asoc, &ep->asocs, asocs) {
3673 int res = sctp_auth_set_key(ep, asoc, authkey);
3674
3675 if (res && !ret)
3676 ret = res;
3677 }
3678 }
3679
3680 out:
3681 memzero_explicit(authkey, optlen);
3682 return ret;
3683 }
3684
3685 /*
3686 * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3687 *
3688 * This option will get or set the active shared key to be used to build
3689 * the association shared key.
3690 */
sctp_setsockopt_active_key(struct sock * sk,struct sctp_authkeyid * val,unsigned int optlen)3691 static int sctp_setsockopt_active_key(struct sock *sk,
3692 struct sctp_authkeyid *val,
3693 unsigned int optlen)
3694 {
3695 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3696 struct sctp_association *asoc;
3697 int ret = 0;
3698
3699 if (optlen != sizeof(struct sctp_authkeyid))
3700 return -EINVAL;
3701
3702 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3703 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3704 sctp_style(sk, UDP))
3705 return -EINVAL;
3706
3707 if (asoc)
3708 return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3709
3710 if (sctp_style(sk, TCP))
3711 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3712
3713 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3714 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3715 ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3716 if (ret)
3717 return ret;
3718 }
3719
3720 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3721 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3722 list_for_each_entry(asoc, &ep->asocs, asocs) {
3723 int res = sctp_auth_set_active_key(ep, asoc,
3724 val->scact_keynumber);
3725
3726 if (res && !ret)
3727 ret = res;
3728 }
3729 }
3730
3731 return ret;
3732 }
3733
3734 /*
3735 * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY)
3736 *
3737 * This set option will delete a shared secret key from use.
3738 */
sctp_setsockopt_del_key(struct sock * sk,struct sctp_authkeyid * val,unsigned int optlen)3739 static int sctp_setsockopt_del_key(struct sock *sk,
3740 struct sctp_authkeyid *val,
3741 unsigned int optlen)
3742 {
3743 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3744 struct sctp_association *asoc;
3745 int ret = 0;
3746
3747 if (optlen != sizeof(struct sctp_authkeyid))
3748 return -EINVAL;
3749
3750 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3751 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3752 sctp_style(sk, UDP))
3753 return -EINVAL;
3754
3755 if (asoc)
3756 return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3757
3758 if (sctp_style(sk, TCP))
3759 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3760
3761 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3762 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3763 ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3764 if (ret)
3765 return ret;
3766 }
3767
3768 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3769 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3770 list_for_each_entry(asoc, &ep->asocs, asocs) {
3771 int res = sctp_auth_del_key_id(ep, asoc,
3772 val->scact_keynumber);
3773
3774 if (res && !ret)
3775 ret = res;
3776 }
3777 }
3778
3779 return ret;
3780 }
3781
3782 /*
3783 * 8.3.4 Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3784 *
3785 * This set option will deactivate a shared secret key.
3786 */
sctp_setsockopt_deactivate_key(struct sock * sk,struct sctp_authkeyid * val,unsigned int optlen)3787 static int sctp_setsockopt_deactivate_key(struct sock *sk,
3788 struct sctp_authkeyid *val,
3789 unsigned int optlen)
3790 {
3791 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3792 struct sctp_association *asoc;
3793 int ret = 0;
3794
3795 if (optlen != sizeof(struct sctp_authkeyid))
3796 return -EINVAL;
3797
3798 asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3799 if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3800 sctp_style(sk, UDP))
3801 return -EINVAL;
3802
3803 if (asoc)
3804 return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3805
3806 if (sctp_style(sk, TCP))
3807 val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3808
3809 if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3810 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3811 ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3812 if (ret)
3813 return ret;
3814 }
3815
3816 if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3817 val->scact_assoc_id == SCTP_ALL_ASSOC) {
3818 list_for_each_entry(asoc, &ep->asocs, asocs) {
3819 int res = sctp_auth_deact_key_id(ep, asoc,
3820 val->scact_keynumber);
3821
3822 if (res && !ret)
3823 ret = res;
3824 }
3825 }
3826
3827 return ret;
3828 }
3829
3830 /*
3831 * 8.1.23 SCTP_AUTO_ASCONF
3832 *
3833 * This option will enable or disable the use of the automatic generation of
3834 * ASCONF chunks to add and delete addresses to an existing association. Note
3835 * that this option has two caveats namely: a) it only affects sockets that
3836 * are bound to all addresses available to the SCTP stack, and b) the system
3837 * administrator may have an overriding control that turns the ASCONF feature
3838 * off no matter what setting the socket option may have.
3839 * This option expects an integer boolean flag, where a non-zero value turns on
3840 * the option, and a zero value turns off the option.
3841 * Note. In this implementation, socket operation overrides default parameter
3842 * being set by sysctl as well as FreeBSD implementation
3843 */
sctp_setsockopt_auto_asconf(struct sock * sk,int * val,unsigned int optlen)3844 static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3845 unsigned int optlen)
3846 {
3847 struct sctp_sock *sp = sctp_sk(sk);
3848
3849 if (optlen < sizeof(int))
3850 return -EINVAL;
3851 if (!sctp_is_ep_boundall(sk) && *val)
3852 return -EINVAL;
3853 if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3854 return 0;
3855
3856 spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3857 if (*val == 0 && sp->do_auto_asconf) {
3858 list_del(&sp->auto_asconf_list);
3859 sp->do_auto_asconf = 0;
3860 } else if (*val && !sp->do_auto_asconf) {
3861 list_add_tail(&sp->auto_asconf_list,
3862 &sock_net(sk)->sctp.auto_asconf_splist);
3863 sp->do_auto_asconf = 1;
3864 }
3865 spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3866 return 0;
3867 }
3868
3869 /*
3870 * SCTP_PEER_ADDR_THLDS
3871 *
3872 * This option allows us to alter the partially failed threshold for one or all
3873 * transports in an association. See Section 6.1 of:
3874 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3875 */
sctp_setsockopt_paddr_thresholds(struct sock * sk,struct sctp_paddrthlds_v2 * val,unsigned int optlen,bool v2)3876 static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3877 struct sctp_paddrthlds_v2 *val,
3878 unsigned int optlen, bool v2)
3879 {
3880 struct sctp_transport *trans;
3881 struct sctp_association *asoc;
3882 int len;
3883
3884 len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3885 if (optlen < len)
3886 return -EINVAL;
3887
3888 if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3889 return -EINVAL;
3890
3891 if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3892 trans = sctp_addr_id2transport(sk, &val->spt_address,
3893 val->spt_assoc_id);
3894 if (!trans)
3895 return -ENOENT;
3896
3897 if (val->spt_pathmaxrxt)
3898 trans->pathmaxrxt = val->spt_pathmaxrxt;
3899 if (v2)
3900 trans->ps_retrans = val->spt_pathcpthld;
3901 trans->pf_retrans = val->spt_pathpfthld;
3902
3903 return 0;
3904 }
3905
3906 asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3907 if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3908 sctp_style(sk, UDP))
3909 return -EINVAL;
3910
3911 if (asoc) {
3912 list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3913 transports) {
3914 if (val->spt_pathmaxrxt)
3915 trans->pathmaxrxt = val->spt_pathmaxrxt;
3916 if (v2)
3917 trans->ps_retrans = val->spt_pathcpthld;
3918 trans->pf_retrans = val->spt_pathpfthld;
3919 }
3920
3921 if (val->spt_pathmaxrxt)
3922 asoc->pathmaxrxt = val->spt_pathmaxrxt;
3923 if (v2)
3924 asoc->ps_retrans = val->spt_pathcpthld;
3925 asoc->pf_retrans = val->spt_pathpfthld;
3926 } else {
3927 struct sctp_sock *sp = sctp_sk(sk);
3928
3929 if (val->spt_pathmaxrxt)
3930 sp->pathmaxrxt = val->spt_pathmaxrxt;
3931 if (v2)
3932 sp->ps_retrans = val->spt_pathcpthld;
3933 sp->pf_retrans = val->spt_pathpfthld;
3934 }
3935
3936 return 0;
3937 }
3938
sctp_setsockopt_recvrcvinfo(struct sock * sk,int * val,unsigned int optlen)3939 static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3940 unsigned int optlen)
3941 {
3942 if (optlen < sizeof(int))
3943 return -EINVAL;
3944
3945 sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3946
3947 return 0;
3948 }
3949
sctp_setsockopt_recvnxtinfo(struct sock * sk,int * val,unsigned int optlen)3950 static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3951 unsigned int optlen)
3952 {
3953 if (optlen < sizeof(int))
3954 return -EINVAL;
3955
3956 sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3957
3958 return 0;
3959 }
3960
sctp_setsockopt_pr_supported(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)3961 static int sctp_setsockopt_pr_supported(struct sock *sk,
3962 struct sctp_assoc_value *params,
3963 unsigned int optlen)
3964 {
3965 struct sctp_association *asoc;
3966
3967 if (optlen != sizeof(*params))
3968 return -EINVAL;
3969
3970 asoc = sctp_id2assoc(sk, params->assoc_id);
3971 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3972 sctp_style(sk, UDP))
3973 return -EINVAL;
3974
3975 sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3976
3977 return 0;
3978 }
3979
sctp_setsockopt_default_prinfo(struct sock * sk,struct sctp_default_prinfo * info,unsigned int optlen)3980 static int sctp_setsockopt_default_prinfo(struct sock *sk,
3981 struct sctp_default_prinfo *info,
3982 unsigned int optlen)
3983 {
3984 struct sctp_sock *sp = sctp_sk(sk);
3985 struct sctp_association *asoc;
3986 int retval = -EINVAL;
3987
3988 if (optlen != sizeof(*info))
3989 goto out;
3990
3991 if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3992 goto out;
3993
3994 if (info->pr_policy == SCTP_PR_SCTP_NONE)
3995 info->pr_value = 0;
3996
3997 asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3998 if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3999 sctp_style(sk, UDP))
4000 goto out;
4001
4002 retval = 0;
4003
4004 if (asoc) {
4005 SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
4006 asoc->default_timetolive = info->pr_value;
4007 goto out;
4008 }
4009
4010 if (sctp_style(sk, TCP))
4011 info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4012
4013 if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4014 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4015 SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4016 sp->default_timetolive = info->pr_value;
4017 }
4018
4019 if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4020 info->pr_assoc_id == SCTP_ALL_ASSOC) {
4021 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4022 SCTP_PR_SET_POLICY(asoc->default_flags,
4023 info->pr_policy);
4024 asoc->default_timetolive = info->pr_value;
4025 }
4026 }
4027
4028 out:
4029 return retval;
4030 }
4031
sctp_setsockopt_reconfig_supported(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4032 static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4033 struct sctp_assoc_value *params,
4034 unsigned int optlen)
4035 {
4036 struct sctp_association *asoc;
4037 int retval = -EINVAL;
4038
4039 if (optlen != sizeof(*params))
4040 goto out;
4041
4042 asoc = sctp_id2assoc(sk, params->assoc_id);
4043 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4044 sctp_style(sk, UDP))
4045 goto out;
4046
4047 sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4048
4049 retval = 0;
4050
4051 out:
4052 return retval;
4053 }
4054
sctp_setsockopt_enable_strreset(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4055 static int sctp_setsockopt_enable_strreset(struct sock *sk,
4056 struct sctp_assoc_value *params,
4057 unsigned int optlen)
4058 {
4059 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4060 struct sctp_association *asoc;
4061 int retval = -EINVAL;
4062
4063 if (optlen != sizeof(*params))
4064 goto out;
4065
4066 if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4067 goto out;
4068
4069 asoc = sctp_id2assoc(sk, params->assoc_id);
4070 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4071 sctp_style(sk, UDP))
4072 goto out;
4073
4074 retval = 0;
4075
4076 if (asoc) {
4077 asoc->strreset_enable = params->assoc_value;
4078 goto out;
4079 }
4080
4081 if (sctp_style(sk, TCP))
4082 params->assoc_id = SCTP_FUTURE_ASSOC;
4083
4084 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4085 params->assoc_id == SCTP_ALL_ASSOC)
4086 ep->strreset_enable = params->assoc_value;
4087
4088 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4089 params->assoc_id == SCTP_ALL_ASSOC)
4090 list_for_each_entry(asoc, &ep->asocs, asocs)
4091 asoc->strreset_enable = params->assoc_value;
4092
4093 out:
4094 return retval;
4095 }
4096
sctp_setsockopt_reset_streams(struct sock * sk,struct sctp_reset_streams * params,unsigned int optlen)4097 static int sctp_setsockopt_reset_streams(struct sock *sk,
4098 struct sctp_reset_streams *params,
4099 unsigned int optlen)
4100 {
4101 struct sctp_association *asoc;
4102
4103 if (optlen < sizeof(*params))
4104 return -EINVAL;
4105 /* srs_number_streams is u16, so optlen can't be bigger than this. */
4106 optlen = min_t(unsigned int, optlen, USHRT_MAX +
4107 sizeof(__u16) * sizeof(*params));
4108
4109 if (params->srs_number_streams * sizeof(__u16) >
4110 optlen - sizeof(*params))
4111 return -EINVAL;
4112
4113 asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4114 if (!asoc)
4115 return -EINVAL;
4116
4117 return sctp_send_reset_streams(asoc, params);
4118 }
4119
sctp_setsockopt_reset_assoc(struct sock * sk,sctp_assoc_t * associd,unsigned int optlen)4120 static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4121 unsigned int optlen)
4122 {
4123 struct sctp_association *asoc;
4124
4125 if (optlen != sizeof(*associd))
4126 return -EINVAL;
4127
4128 asoc = sctp_id2assoc(sk, *associd);
4129 if (!asoc)
4130 return -EINVAL;
4131
4132 return sctp_send_reset_assoc(asoc);
4133 }
4134
sctp_setsockopt_add_streams(struct sock * sk,struct sctp_add_streams * params,unsigned int optlen)4135 static int sctp_setsockopt_add_streams(struct sock *sk,
4136 struct sctp_add_streams *params,
4137 unsigned int optlen)
4138 {
4139 struct sctp_association *asoc;
4140
4141 if (optlen != sizeof(*params))
4142 return -EINVAL;
4143
4144 asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4145 if (!asoc)
4146 return -EINVAL;
4147
4148 return sctp_send_add_streams(asoc, params);
4149 }
4150
sctp_setsockopt_scheduler(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4151 static int sctp_setsockopt_scheduler(struct sock *sk,
4152 struct sctp_assoc_value *params,
4153 unsigned int optlen)
4154 {
4155 struct sctp_sock *sp = sctp_sk(sk);
4156 struct sctp_association *asoc;
4157 int retval = 0;
4158
4159 if (optlen < sizeof(*params))
4160 return -EINVAL;
4161
4162 if (params->assoc_value > SCTP_SS_MAX)
4163 return -EINVAL;
4164
4165 asoc = sctp_id2assoc(sk, params->assoc_id);
4166 if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4167 sctp_style(sk, UDP))
4168 return -EINVAL;
4169
4170 if (asoc)
4171 return sctp_sched_set_sched(asoc, params->assoc_value);
4172
4173 if (sctp_style(sk, TCP))
4174 params->assoc_id = SCTP_FUTURE_ASSOC;
4175
4176 if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4177 params->assoc_id == SCTP_ALL_ASSOC)
4178 sp->default_ss = params->assoc_value;
4179
4180 if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4181 params->assoc_id == SCTP_ALL_ASSOC) {
4182 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4183 int ret = sctp_sched_set_sched(asoc,
4184 params->assoc_value);
4185
4186 if (ret && !retval)
4187 retval = ret;
4188 }
4189 }
4190
4191 return retval;
4192 }
4193
sctp_setsockopt_scheduler_value(struct sock * sk,struct sctp_stream_value * params,unsigned int optlen)4194 static int sctp_setsockopt_scheduler_value(struct sock *sk,
4195 struct sctp_stream_value *params,
4196 unsigned int optlen)
4197 {
4198 struct sctp_association *asoc;
4199 int retval = -EINVAL;
4200
4201 if (optlen < sizeof(*params))
4202 goto out;
4203
4204 asoc = sctp_id2assoc(sk, params->assoc_id);
4205 if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4206 sctp_style(sk, UDP))
4207 goto out;
4208
4209 if (asoc) {
4210 retval = sctp_sched_set_value(asoc, params->stream_id,
4211 params->stream_value, GFP_KERNEL);
4212 goto out;
4213 }
4214
4215 retval = 0;
4216
4217 list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4218 int ret = sctp_sched_set_value(asoc, params->stream_id,
4219 params->stream_value,
4220 GFP_KERNEL);
4221 if (ret && !retval) /* try to return the 1st error. */
4222 retval = ret;
4223 }
4224
4225 out:
4226 return retval;
4227 }
4228
sctp_setsockopt_interleaving_supported(struct sock * sk,struct sctp_assoc_value * p,unsigned int optlen)4229 static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4230 struct sctp_assoc_value *p,
4231 unsigned int optlen)
4232 {
4233 struct sctp_sock *sp = sctp_sk(sk);
4234 struct sctp_association *asoc;
4235
4236 if (optlen < sizeof(*p))
4237 return -EINVAL;
4238
4239 asoc = sctp_id2assoc(sk, p->assoc_id);
4240 if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4241 return -EINVAL;
4242
4243 if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4244 return -EPERM;
4245 }
4246
4247 sp->ep->intl_enable = !!p->assoc_value;
4248 return 0;
4249 }
4250
sctp_setsockopt_reuse_port(struct sock * sk,int * val,unsigned int optlen)4251 static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4252 unsigned int optlen)
4253 {
4254 if (!sctp_style(sk, TCP))
4255 return -EOPNOTSUPP;
4256
4257 if (sctp_sk(sk)->ep->base.bind_addr.port)
4258 return -EFAULT;
4259
4260 if (optlen < sizeof(int))
4261 return -EINVAL;
4262
4263 sctp_sk(sk)->reuse = !!*val;
4264
4265 return 0;
4266 }
4267
sctp_assoc_ulpevent_type_set(struct sctp_event * param,struct sctp_association * asoc)4268 static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4269 struct sctp_association *asoc)
4270 {
4271 struct sctp_ulpevent *event;
4272
4273 sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4274
4275 if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4276 if (sctp_outq_is_empty(&asoc->outqueue)) {
4277 event = sctp_ulpevent_make_sender_dry_event(asoc,
4278 GFP_USER | __GFP_NOWARN);
4279 if (!event)
4280 return -ENOMEM;
4281
4282 asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4283 }
4284 }
4285
4286 return 0;
4287 }
4288
sctp_setsockopt_event(struct sock * sk,struct sctp_event * param,unsigned int optlen)4289 static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4290 unsigned int optlen)
4291 {
4292 struct sctp_sock *sp = sctp_sk(sk);
4293 struct sctp_association *asoc;
4294 int retval = 0;
4295
4296 if (optlen < sizeof(*param))
4297 return -EINVAL;
4298
4299 if (param->se_type < SCTP_SN_TYPE_BASE ||
4300 param->se_type > SCTP_SN_TYPE_MAX)
4301 return -EINVAL;
4302
4303 asoc = sctp_id2assoc(sk, param->se_assoc_id);
4304 if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4305 sctp_style(sk, UDP))
4306 return -EINVAL;
4307
4308 if (asoc)
4309 return sctp_assoc_ulpevent_type_set(param, asoc);
4310
4311 if (sctp_style(sk, TCP))
4312 param->se_assoc_id = SCTP_FUTURE_ASSOC;
4313
4314 if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4315 param->se_assoc_id == SCTP_ALL_ASSOC)
4316 sctp_ulpevent_type_set(&sp->subscribe,
4317 param->se_type, param->se_on);
4318
4319 if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4320 param->se_assoc_id == SCTP_ALL_ASSOC) {
4321 list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4322 int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4323
4324 if (ret && !retval)
4325 retval = ret;
4326 }
4327 }
4328
4329 return retval;
4330 }
4331
sctp_setsockopt_asconf_supported(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4332 static int sctp_setsockopt_asconf_supported(struct sock *sk,
4333 struct sctp_assoc_value *params,
4334 unsigned int optlen)
4335 {
4336 struct sctp_association *asoc;
4337 struct sctp_endpoint *ep;
4338 int retval = -EINVAL;
4339
4340 if (optlen != sizeof(*params))
4341 goto out;
4342
4343 asoc = sctp_id2assoc(sk, params->assoc_id);
4344 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4345 sctp_style(sk, UDP))
4346 goto out;
4347
4348 ep = sctp_sk(sk)->ep;
4349 ep->asconf_enable = !!params->assoc_value;
4350
4351 if (ep->asconf_enable && ep->auth_enable) {
4352 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4353 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4354 }
4355
4356 retval = 0;
4357
4358 out:
4359 return retval;
4360 }
4361
sctp_setsockopt_auth_supported(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4362 static int sctp_setsockopt_auth_supported(struct sock *sk,
4363 struct sctp_assoc_value *params,
4364 unsigned int optlen)
4365 {
4366 struct sctp_association *asoc;
4367 struct sctp_endpoint *ep;
4368 int retval = -EINVAL;
4369
4370 if (optlen != sizeof(*params))
4371 goto out;
4372
4373 asoc = sctp_id2assoc(sk, params->assoc_id);
4374 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4375 sctp_style(sk, UDP))
4376 goto out;
4377
4378 ep = sctp_sk(sk)->ep;
4379 if (params->assoc_value) {
4380 retval = sctp_auth_init(ep, GFP_KERNEL);
4381 if (retval)
4382 goto out;
4383 if (ep->asconf_enable) {
4384 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4385 sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4386 }
4387 }
4388
4389 ep->auth_enable = !!params->assoc_value;
4390 retval = 0;
4391
4392 out:
4393 return retval;
4394 }
4395
sctp_setsockopt_ecn_supported(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4396 static int sctp_setsockopt_ecn_supported(struct sock *sk,
4397 struct sctp_assoc_value *params,
4398 unsigned int optlen)
4399 {
4400 struct sctp_association *asoc;
4401 int retval = -EINVAL;
4402
4403 if (optlen != sizeof(*params))
4404 goto out;
4405
4406 asoc = sctp_id2assoc(sk, params->assoc_id);
4407 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4408 sctp_style(sk, UDP))
4409 goto out;
4410
4411 sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4412 retval = 0;
4413
4414 out:
4415 return retval;
4416 }
4417
sctp_setsockopt_pf_expose(struct sock * sk,struct sctp_assoc_value * params,unsigned int optlen)4418 static int sctp_setsockopt_pf_expose(struct sock *sk,
4419 struct sctp_assoc_value *params,
4420 unsigned int optlen)
4421 {
4422 struct sctp_association *asoc;
4423 int retval = -EINVAL;
4424
4425 if (optlen != sizeof(*params))
4426 goto out;
4427
4428 if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4429 goto out;
4430
4431 asoc = sctp_id2assoc(sk, params->assoc_id);
4432 if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4433 sctp_style(sk, UDP))
4434 goto out;
4435
4436 if (asoc)
4437 asoc->pf_expose = params->assoc_value;
4438 else
4439 sctp_sk(sk)->pf_expose = params->assoc_value;
4440 retval = 0;
4441
4442 out:
4443 return retval;
4444 }
4445
sctp_setsockopt_encap_port(struct sock * sk,struct sctp_udpencaps * encap,unsigned int optlen)4446 static int sctp_setsockopt_encap_port(struct sock *sk,
4447 struct sctp_udpencaps *encap,
4448 unsigned int optlen)
4449 {
4450 struct sctp_association *asoc;
4451 struct sctp_transport *t;
4452 __be16 encap_port;
4453
4454 if (optlen != sizeof(*encap))
4455 return -EINVAL;
4456
4457 /* If an address other than INADDR_ANY is specified, and
4458 * no transport is found, then the request is invalid.
4459 */
4460 encap_port = (__force __be16)encap->sue_port;
4461 if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4462 t = sctp_addr_id2transport(sk, &encap->sue_address,
4463 encap->sue_assoc_id);
4464 if (!t)
4465 return -EINVAL;
4466
4467 t->encap_port = encap_port;
4468 return 0;
4469 }
4470
4471 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4472 * socket is a one to many style socket, and an association
4473 * was not found, then the id was invalid.
4474 */
4475 asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4476 if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4477 sctp_style(sk, UDP))
4478 return -EINVAL;
4479
4480 /* If changes are for association, also apply encap_port to
4481 * each transport.
4482 */
4483 if (asoc) {
4484 list_for_each_entry(t, &asoc->peer.transport_addr_list,
4485 transports)
4486 t->encap_port = encap_port;
4487
4488 asoc->encap_port = encap_port;
4489 return 0;
4490 }
4491
4492 sctp_sk(sk)->encap_port = encap_port;
4493 return 0;
4494 }
4495
sctp_setsockopt_probe_interval(struct sock * sk,struct sctp_probeinterval * params,unsigned int optlen)4496 static int sctp_setsockopt_probe_interval(struct sock *sk,
4497 struct sctp_probeinterval *params,
4498 unsigned int optlen)
4499 {
4500 struct sctp_association *asoc;
4501 struct sctp_transport *t;
4502 __u32 probe_interval;
4503
4504 if (optlen != sizeof(*params))
4505 return -EINVAL;
4506
4507 probe_interval = params->spi_interval;
4508 if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4509 return -EINVAL;
4510
4511 /* If an address other than INADDR_ANY is specified, and
4512 * no transport is found, then the request is invalid.
4513 */
4514 if (!sctp_is_any(sk, (union sctp_addr *)¶ms->spi_address)) {
4515 t = sctp_addr_id2transport(sk, ¶ms->spi_address,
4516 params->spi_assoc_id);
4517 if (!t)
4518 return -EINVAL;
4519
4520 t->probe_interval = msecs_to_jiffies(probe_interval);
4521 sctp_transport_pl_reset(t);
4522 return 0;
4523 }
4524
4525 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4526 * socket is a one to many style socket, and an association
4527 * was not found, then the id was invalid.
4528 */
4529 asoc = sctp_id2assoc(sk, params->spi_assoc_id);
4530 if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4531 sctp_style(sk, UDP))
4532 return -EINVAL;
4533
4534 /* If changes are for association, also apply probe_interval to
4535 * each transport.
4536 */
4537 if (asoc) {
4538 list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4539 t->probe_interval = msecs_to_jiffies(probe_interval);
4540 sctp_transport_pl_reset(t);
4541 }
4542
4543 asoc->probe_interval = msecs_to_jiffies(probe_interval);
4544 return 0;
4545 }
4546
4547 sctp_sk(sk)->probe_interval = probe_interval;
4548 return 0;
4549 }
4550
4551 /* API 6.2 setsockopt(), getsockopt()
4552 *
4553 * Applications use setsockopt() and getsockopt() to set or retrieve
4554 * socket options. Socket options are used to change the default
4555 * behavior of sockets calls. They are described in Section 7.
4556 *
4557 * The syntax is:
4558 *
4559 * ret = getsockopt(int sd, int level, int optname, void __user *optval,
4560 * int __user *optlen);
4561 * ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4562 * int optlen);
4563 *
4564 * sd - the socket descript.
4565 * level - set to IPPROTO_SCTP for all SCTP options.
4566 * optname - the option name.
4567 * optval - the buffer to store the value of the option.
4568 * optlen - the size of the buffer.
4569 */
sctp_setsockopt(struct sock * sk,int level,int optname,sockptr_t optval,unsigned int optlen)4570 static int sctp_setsockopt(struct sock *sk, int level, int optname,
4571 sockptr_t optval, unsigned int optlen)
4572 {
4573 void *kopt = NULL;
4574 int retval = 0;
4575
4576 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4577
4578 /* I can hardly begin to describe how wrong this is. This is
4579 * so broken as to be worse than useless. The API draft
4580 * REALLY is NOT helpful here... I am not convinced that the
4581 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4582 * are at all well-founded.
4583 */
4584 if (level != SOL_SCTP) {
4585 struct sctp_af *af = sctp_sk(sk)->pf->af;
4586
4587 return af->setsockopt(sk, level, optname, optval, optlen);
4588 }
4589
4590 if (optlen > 0) {
4591 /* Trim it to the biggest size sctp sockopt may need if necessary */
4592 optlen = min_t(unsigned int, optlen,
4593 PAGE_ALIGN(USHRT_MAX +
4594 sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4595 kopt = memdup_sockptr(optval, optlen);
4596 if (IS_ERR(kopt))
4597 return PTR_ERR(kopt);
4598 }
4599
4600 lock_sock(sk);
4601
4602 switch (optname) {
4603 case SCTP_SOCKOPT_BINDX_ADD:
4604 /* 'optlen' is the size of the addresses buffer. */
4605 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4606 SCTP_BINDX_ADD_ADDR);
4607 break;
4608
4609 case SCTP_SOCKOPT_BINDX_REM:
4610 /* 'optlen' is the size of the addresses buffer. */
4611 retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4612 SCTP_BINDX_REM_ADDR);
4613 break;
4614
4615 case SCTP_SOCKOPT_CONNECTX_OLD:
4616 /* 'optlen' is the size of the addresses buffer. */
4617 retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4618 break;
4619
4620 case SCTP_SOCKOPT_CONNECTX:
4621 /* 'optlen' is the size of the addresses buffer. */
4622 retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4623 break;
4624
4625 case SCTP_DISABLE_FRAGMENTS:
4626 retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4627 break;
4628
4629 case SCTP_EVENTS:
4630 retval = sctp_setsockopt_events(sk, kopt, optlen);
4631 break;
4632
4633 case SCTP_AUTOCLOSE:
4634 retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4635 break;
4636
4637 case SCTP_PEER_ADDR_PARAMS:
4638 retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4639 break;
4640
4641 case SCTP_DELAYED_SACK:
4642 retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4643 break;
4644 case SCTP_PARTIAL_DELIVERY_POINT:
4645 retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4646 break;
4647
4648 case SCTP_INITMSG:
4649 retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4650 break;
4651 case SCTP_DEFAULT_SEND_PARAM:
4652 retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4653 break;
4654 case SCTP_DEFAULT_SNDINFO:
4655 retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4656 break;
4657 case SCTP_PRIMARY_ADDR:
4658 retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4659 break;
4660 case SCTP_SET_PEER_PRIMARY_ADDR:
4661 retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4662 break;
4663 case SCTP_NODELAY:
4664 retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4665 break;
4666 case SCTP_RTOINFO:
4667 retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4668 break;
4669 case SCTP_ASSOCINFO:
4670 retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4671 break;
4672 case SCTP_I_WANT_MAPPED_V4_ADDR:
4673 retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4674 break;
4675 case SCTP_MAXSEG:
4676 retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4677 break;
4678 case SCTP_ADAPTATION_LAYER:
4679 retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4680 break;
4681 case SCTP_CONTEXT:
4682 retval = sctp_setsockopt_context(sk, kopt, optlen);
4683 break;
4684 case SCTP_FRAGMENT_INTERLEAVE:
4685 retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4686 break;
4687 case SCTP_MAX_BURST:
4688 retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4689 break;
4690 case SCTP_AUTH_CHUNK:
4691 retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4692 break;
4693 case SCTP_HMAC_IDENT:
4694 retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4695 break;
4696 case SCTP_AUTH_KEY:
4697 retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4698 break;
4699 case SCTP_AUTH_ACTIVE_KEY:
4700 retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4701 break;
4702 case SCTP_AUTH_DELETE_KEY:
4703 retval = sctp_setsockopt_del_key(sk, kopt, optlen);
4704 break;
4705 case SCTP_AUTH_DEACTIVATE_KEY:
4706 retval = sctp_setsockopt_deactivate_key(sk, kopt, optlen);
4707 break;
4708 case SCTP_AUTO_ASCONF:
4709 retval = sctp_setsockopt_auto_asconf(sk, kopt, optlen);
4710 break;
4711 case SCTP_PEER_ADDR_THLDS:
4712 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4713 false);
4714 break;
4715 case SCTP_PEER_ADDR_THLDS_V2:
4716 retval = sctp_setsockopt_paddr_thresholds(sk, kopt, optlen,
4717 true);
4718 break;
4719 case SCTP_RECVRCVINFO:
4720 retval = sctp_setsockopt_recvrcvinfo(sk, kopt, optlen);
4721 break;
4722 case SCTP_RECVNXTINFO:
4723 retval = sctp_setsockopt_recvnxtinfo(sk, kopt, optlen);
4724 break;
4725 case SCTP_PR_SUPPORTED:
4726 retval = sctp_setsockopt_pr_supported(sk, kopt, optlen);
4727 break;
4728 case SCTP_DEFAULT_PRINFO:
4729 retval = sctp_setsockopt_default_prinfo(sk, kopt, optlen);
4730 break;
4731 case SCTP_RECONFIG_SUPPORTED:
4732 retval = sctp_setsockopt_reconfig_supported(sk, kopt, optlen);
4733 break;
4734 case SCTP_ENABLE_STREAM_RESET:
4735 retval = sctp_setsockopt_enable_strreset(sk, kopt, optlen);
4736 break;
4737 case SCTP_RESET_STREAMS:
4738 retval = sctp_setsockopt_reset_streams(sk, kopt, optlen);
4739 break;
4740 case SCTP_RESET_ASSOC:
4741 retval = sctp_setsockopt_reset_assoc(sk, kopt, optlen);
4742 break;
4743 case SCTP_ADD_STREAMS:
4744 retval = sctp_setsockopt_add_streams(sk, kopt, optlen);
4745 break;
4746 case SCTP_STREAM_SCHEDULER:
4747 retval = sctp_setsockopt_scheduler(sk, kopt, optlen);
4748 break;
4749 case SCTP_STREAM_SCHEDULER_VALUE:
4750 retval = sctp_setsockopt_scheduler_value(sk, kopt, optlen);
4751 break;
4752 case SCTP_INTERLEAVING_SUPPORTED:
4753 retval = sctp_setsockopt_interleaving_supported(sk, kopt,
4754 optlen);
4755 break;
4756 case SCTP_REUSE_PORT:
4757 retval = sctp_setsockopt_reuse_port(sk, kopt, optlen);
4758 break;
4759 case SCTP_EVENT:
4760 retval = sctp_setsockopt_event(sk, kopt, optlen);
4761 break;
4762 case SCTP_ASCONF_SUPPORTED:
4763 retval = sctp_setsockopt_asconf_supported(sk, kopt, optlen);
4764 break;
4765 case SCTP_AUTH_SUPPORTED:
4766 retval = sctp_setsockopt_auth_supported(sk, kopt, optlen);
4767 break;
4768 case SCTP_ECN_SUPPORTED:
4769 retval = sctp_setsockopt_ecn_supported(sk, kopt, optlen);
4770 break;
4771 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
4772 retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
4773 break;
4774 case SCTP_REMOTE_UDP_ENCAPS_PORT:
4775 retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
4776 break;
4777 case SCTP_PLPMTUD_PROBE_INTERVAL:
4778 retval = sctp_setsockopt_probe_interval(sk, kopt, optlen);
4779 break;
4780 default:
4781 retval = -ENOPROTOOPT;
4782 break;
4783 }
4784
4785 release_sock(sk);
4786 kfree(kopt);
4787 return retval;
4788 }
4789
4790 /* API 3.1.6 connect() - UDP Style Syntax
4791 *
4792 * An application may use the connect() call in the UDP model to initiate an
4793 * association without sending data.
4794 *
4795 * The syntax is:
4796 *
4797 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
4798 *
4799 * sd: the socket descriptor to have a new association added to.
4800 *
4801 * nam: the address structure (either struct sockaddr_in or struct
4802 * sockaddr_in6 defined in RFC2553 [7]).
4803 *
4804 * len: the size of the address.
4805 */
sctp_connect(struct sock * sk,struct sockaddr * addr,int addr_len,int flags)4806 static int sctp_connect(struct sock *sk, struct sockaddr *addr,
4807 int addr_len, int flags)
4808 {
4809 struct sctp_af *af;
4810 int err = -EINVAL;
4811
4812 lock_sock(sk);
4813 pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
4814 addr, addr_len);
4815
4816 /* Validate addr_len before calling common connect/connectx routine. */
4817 af = sctp_get_af_specific(addr->sa_family);
4818 if (af && addr_len >= af->sockaddr_len)
4819 err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL);
4820
4821 release_sock(sk);
4822 return err;
4823 }
4824
sctp_inet_connect(struct socket * sock,struct sockaddr * uaddr,int addr_len,int flags)4825 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
4826 int addr_len, int flags)
4827 {
4828 if (addr_len < sizeof(uaddr->sa_family))
4829 return -EINVAL;
4830
4831 if (uaddr->sa_family == AF_UNSPEC)
4832 return -EOPNOTSUPP;
4833
4834 return sctp_connect(sock->sk, uaddr, addr_len, flags);
4835 }
4836
4837 /* FIXME: Write comments. */
sctp_disconnect(struct sock * sk,int flags)4838 static int sctp_disconnect(struct sock *sk, int flags)
4839 {
4840 return -EOPNOTSUPP; /* STUB */
4841 }
4842
4843 /* 4.1.4 accept() - TCP Style Syntax
4844 *
4845 * Applications use accept() call to remove an established SCTP
4846 * association from the accept queue of the endpoint. A new socket
4847 * descriptor will be returned from accept() to represent the newly
4848 * formed association.
4849 */
sctp_accept(struct sock * sk,struct proto_accept_arg * arg)4850 static struct sock *sctp_accept(struct sock *sk, struct proto_accept_arg *arg)
4851 {
4852 struct sctp_sock *sp;
4853 struct sctp_endpoint *ep;
4854 struct sock *newsk = NULL;
4855 struct sctp_association *asoc;
4856 long timeo;
4857 int error = 0;
4858
4859 lock_sock(sk);
4860
4861 sp = sctp_sk(sk);
4862 ep = sp->ep;
4863
4864 if (!sctp_style(sk, TCP)) {
4865 error = -EOPNOTSUPP;
4866 goto out;
4867 }
4868
4869 if (!sctp_sstate(sk, LISTENING)) {
4870 error = -EINVAL;
4871 goto out;
4872 }
4873
4874 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
4875
4876 error = sctp_wait_for_accept(sk, timeo);
4877 if (error)
4878 goto out;
4879
4880 /* We treat the list of associations on the endpoint as the accept
4881 * queue and pick the first association on the list.
4882 */
4883 asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
4884
4885 newsk = sp->pf->create_accept_sk(sk, asoc, arg->kern);
4886 if (!newsk) {
4887 error = -ENOMEM;
4888 goto out;
4889 }
4890
4891 /* Populate the fields of the newsk from the oldsk and migrate the
4892 * asoc to the newsk.
4893 */
4894 error = sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
4895 if (error) {
4896 sk_common_release(newsk);
4897 newsk = NULL;
4898 }
4899
4900 out:
4901 release_sock(sk);
4902 arg->err = error;
4903 return newsk;
4904 }
4905
4906 /* The SCTP ioctl handler. */
sctp_ioctl(struct sock * sk,int cmd,int * karg)4907 static int sctp_ioctl(struct sock *sk, int cmd, int *karg)
4908 {
4909 int rc = -ENOTCONN;
4910
4911 lock_sock(sk);
4912
4913 /*
4914 * SEQPACKET-style sockets in LISTENING state are valid, for
4915 * SCTP, so only discard TCP-style sockets in LISTENING state.
4916 */
4917 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
4918 goto out;
4919
4920 switch (cmd) {
4921 case SIOCINQ: {
4922 struct sk_buff *skb;
4923 *karg = 0;
4924
4925 skb = skb_peek(&sk->sk_receive_queue);
4926 if (skb != NULL) {
4927 /*
4928 * We will only return the amount of this packet since
4929 * that is all that will be read.
4930 */
4931 *karg = skb->len;
4932 }
4933 rc = 0;
4934 break;
4935 }
4936 default:
4937 rc = -ENOIOCTLCMD;
4938 break;
4939 }
4940 out:
4941 release_sock(sk);
4942 return rc;
4943 }
4944
4945 /* This is the function which gets called during socket creation to
4946 * initialized the SCTP-specific portion of the sock.
4947 * The sock structure should already be zero-filled memory.
4948 */
sctp_init_sock(struct sock * sk)4949 static int sctp_init_sock(struct sock *sk)
4950 {
4951 struct net *net = sock_net(sk);
4952 struct sctp_sock *sp;
4953
4954 pr_debug("%s: sk:%p\n", __func__, sk);
4955
4956 sp = sctp_sk(sk);
4957
4958 /* Initialize the SCTP per socket area. */
4959 switch (sk->sk_type) {
4960 case SOCK_SEQPACKET:
4961 sp->type = SCTP_SOCKET_UDP;
4962 break;
4963 case SOCK_STREAM:
4964 sp->type = SCTP_SOCKET_TCP;
4965 break;
4966 default:
4967 return -ESOCKTNOSUPPORT;
4968 }
4969
4970 sk->sk_gso_type = SKB_GSO_SCTP;
4971
4972 /* Initialize default send parameters. These parameters can be
4973 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
4974 */
4975 sp->default_stream = 0;
4976 sp->default_ppid = 0;
4977 sp->default_flags = 0;
4978 sp->default_context = 0;
4979 sp->default_timetolive = 0;
4980
4981 sp->default_rcv_context = 0;
4982 sp->max_burst = net->sctp.max_burst;
4983
4984 sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
4985
4986 /* Initialize default setup parameters. These parameters
4987 * can be modified with the SCTP_INITMSG socket option or
4988 * overridden by the SCTP_INIT CMSG.
4989 */
4990 sp->initmsg.sinit_num_ostreams = sctp_max_outstreams;
4991 sp->initmsg.sinit_max_instreams = sctp_max_instreams;
4992 sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init;
4993 sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
4994
4995 /* Initialize default RTO related parameters. These parameters can
4996 * be modified for with the SCTP_RTOINFO socket option.
4997 */
4998 sp->rtoinfo.srto_initial = net->sctp.rto_initial;
4999 sp->rtoinfo.srto_max = net->sctp.rto_max;
5000 sp->rtoinfo.srto_min = net->sctp.rto_min;
5001
5002 /* Initialize default association related parameters. These parameters
5003 * can be modified with the SCTP_ASSOCINFO socket option.
5004 */
5005 sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
5006 sp->assocparams.sasoc_number_peer_destinations = 0;
5007 sp->assocparams.sasoc_peer_rwnd = 0;
5008 sp->assocparams.sasoc_local_rwnd = 0;
5009 sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
5010
5011 /* Initialize default event subscriptions. By default, all the
5012 * options are off.
5013 */
5014 sp->subscribe = 0;
5015
5016 /* Default Peer Address Parameters. These defaults can
5017 * be modified via SCTP_PEER_ADDR_PARAMS
5018 */
5019 sp->hbinterval = net->sctp.hb_interval;
5020 sp->udp_port = htons(net->sctp.udp_port);
5021 sp->encap_port = htons(net->sctp.encap_port);
5022 sp->pathmaxrxt = net->sctp.max_retrans_path;
5023 sp->pf_retrans = net->sctp.pf_retrans;
5024 sp->ps_retrans = net->sctp.ps_retrans;
5025 sp->pf_expose = net->sctp.pf_expose;
5026 sp->pathmtu = 0; /* allow default discovery */
5027 sp->sackdelay = net->sctp.sack_timeout;
5028 sp->sackfreq = 2;
5029 sp->param_flags = SPP_HB_ENABLE |
5030 SPP_PMTUD_ENABLE |
5031 SPP_SACKDELAY_ENABLE;
5032 sp->default_ss = SCTP_SS_DEFAULT;
5033
5034 /* If enabled no SCTP message fragmentation will be performed.
5035 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
5036 */
5037 sp->disable_fragments = 0;
5038
5039 /* Enable Nagle algorithm by default. */
5040 sp->nodelay = 0;
5041
5042 sp->recvrcvinfo = 0;
5043 sp->recvnxtinfo = 0;
5044
5045 /* Enable by default. */
5046 sp->v4mapped = 1;
5047
5048 /* Auto-close idle associations after the configured
5049 * number of seconds. A value of 0 disables this
5050 * feature. Configure through the SCTP_AUTOCLOSE socket option,
5051 * for UDP-style sockets only.
5052 */
5053 sp->autoclose = 0;
5054
5055 /* User specified fragmentation limit. */
5056 sp->user_frag = 0;
5057
5058 sp->adaptation_ind = 0;
5059
5060 sp->pf = sctp_get_pf_specific(sk->sk_family);
5061
5062 /* Control variables for partial data delivery. */
5063 atomic_set(&sp->pd_mode, 0);
5064 skb_queue_head_init(&sp->pd_lobby);
5065 sp->frag_interleave = 0;
5066 sp->probe_interval = net->sctp.probe_interval;
5067
5068 /* Create a per socket endpoint structure. Even if we
5069 * change the data structure relationships, this may still
5070 * be useful for storing pre-connect address information.
5071 */
5072 sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
5073 if (!sp->ep)
5074 return -ENOMEM;
5075
5076 sp->hmac = NULL;
5077
5078 sk->sk_destruct = sctp_destruct_sock;
5079
5080 SCTP_DBG_OBJCNT_INC(sock);
5081
5082 sk_sockets_allocated_inc(sk);
5083 sock_prot_inuse_add(net, sk->sk_prot, 1);
5084
5085 return 0;
5086 }
5087
5088 /* Cleanup any SCTP per socket resources. Must be called with
5089 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
5090 */
sctp_destroy_sock(struct sock * sk)5091 static void sctp_destroy_sock(struct sock *sk)
5092 {
5093 struct sctp_sock *sp;
5094
5095 pr_debug("%s: sk:%p\n", __func__, sk);
5096
5097 /* Release our hold on the endpoint. */
5098 sp = sctp_sk(sk);
5099 /* This could happen during socket init, thus we bail out
5100 * early, since the rest of the below is not setup either.
5101 */
5102 if (sp->ep == NULL)
5103 return;
5104
5105 if (sp->do_auto_asconf) {
5106 sp->do_auto_asconf = 0;
5107 list_del(&sp->auto_asconf_list);
5108 }
5109 sctp_endpoint_free(sp->ep);
5110 sk_sockets_allocated_dec(sk);
5111 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
5112 }
5113
5114 /* Triggered when there are no references on the socket anymore */
sctp_destruct_common(struct sock * sk)5115 static void sctp_destruct_common(struct sock *sk)
5116 {
5117 struct sctp_sock *sp = sctp_sk(sk);
5118
5119 /* Free up the HMAC transform. */
5120 crypto_free_shash(sp->hmac);
5121 }
5122
sctp_destruct_sock(struct sock * sk)5123 static void sctp_destruct_sock(struct sock *sk)
5124 {
5125 sctp_destruct_common(sk);
5126 inet_sock_destruct(sk);
5127 }
5128
5129 /* API 4.1.7 shutdown() - TCP Style Syntax
5130 * int shutdown(int socket, int how);
5131 *
5132 * sd - the socket descriptor of the association to be closed.
5133 * how - Specifies the type of shutdown. The values are
5134 * as follows:
5135 * SHUT_RD
5136 * Disables further receive operations. No SCTP
5137 * protocol action is taken.
5138 * SHUT_WR
5139 * Disables further send operations, and initiates
5140 * the SCTP shutdown sequence.
5141 * SHUT_RDWR
5142 * Disables further send and receive operations
5143 * and initiates the SCTP shutdown sequence.
5144 */
sctp_shutdown(struct sock * sk,int how)5145 static void sctp_shutdown(struct sock *sk, int how)
5146 {
5147 struct net *net = sock_net(sk);
5148 struct sctp_endpoint *ep;
5149
5150 if (!sctp_style(sk, TCP))
5151 return;
5152
5153 ep = sctp_sk(sk)->ep;
5154 if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
5155 struct sctp_association *asoc;
5156
5157 inet_sk_set_state(sk, SCTP_SS_CLOSING);
5158 asoc = list_entry(ep->asocs.next,
5159 struct sctp_association, asocs);
5160 sctp_primitive_SHUTDOWN(net, asoc, NULL);
5161 }
5162 }
5163
sctp_get_sctp_info(struct sock * sk,struct sctp_association * asoc,struct sctp_info * info)5164 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
5165 struct sctp_info *info)
5166 {
5167 struct sctp_transport *prim;
5168 struct list_head *pos;
5169 int mask;
5170
5171 memset(info, 0, sizeof(*info));
5172 if (!asoc) {
5173 struct sctp_sock *sp = sctp_sk(sk);
5174
5175 info->sctpi_s_autoclose = sp->autoclose;
5176 info->sctpi_s_adaptation_ind = sp->adaptation_ind;
5177 info->sctpi_s_pd_point = sp->pd_point;
5178 info->sctpi_s_nodelay = sp->nodelay;
5179 info->sctpi_s_disable_fragments = sp->disable_fragments;
5180 info->sctpi_s_v4mapped = sp->v4mapped;
5181 info->sctpi_s_frag_interleave = sp->frag_interleave;
5182 info->sctpi_s_type = sp->type;
5183
5184 return 0;
5185 }
5186
5187 info->sctpi_tag = asoc->c.my_vtag;
5188 info->sctpi_state = asoc->state;
5189 info->sctpi_rwnd = asoc->a_rwnd;
5190 info->sctpi_unackdata = asoc->unack_data;
5191 info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5192 info->sctpi_instrms = asoc->stream.incnt;
5193 info->sctpi_outstrms = asoc->stream.outcnt;
5194 list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
5195 info->sctpi_inqueue++;
5196 list_for_each(pos, &asoc->outqueue.out_chunk_list)
5197 info->sctpi_outqueue++;
5198 info->sctpi_overall_error = asoc->overall_error_count;
5199 info->sctpi_max_burst = asoc->max_burst;
5200 info->sctpi_maxseg = asoc->frag_point;
5201 info->sctpi_peer_rwnd = asoc->peer.rwnd;
5202 info->sctpi_peer_tag = asoc->c.peer_vtag;
5203
5204 mask = asoc->peer.intl_capable << 1;
5205 mask = (mask | asoc->peer.ecn_capable) << 1;
5206 mask = (mask | asoc->peer.ipv4_address) << 1;
5207 mask = (mask | asoc->peer.ipv6_address) << 1;
5208 mask = (mask | asoc->peer.reconf_capable) << 1;
5209 mask = (mask | asoc->peer.asconf_capable) << 1;
5210 mask = (mask | asoc->peer.prsctp_capable) << 1;
5211 mask = (mask | asoc->peer.auth_capable);
5212 info->sctpi_peer_capable = mask;
5213 mask = asoc->peer.sack_needed << 1;
5214 mask = (mask | asoc->peer.sack_generation) << 1;
5215 mask = (mask | asoc->peer.zero_window_announced);
5216 info->sctpi_peer_sack = mask;
5217
5218 info->sctpi_isacks = asoc->stats.isacks;
5219 info->sctpi_osacks = asoc->stats.osacks;
5220 info->sctpi_opackets = asoc->stats.opackets;
5221 info->sctpi_ipackets = asoc->stats.ipackets;
5222 info->sctpi_rtxchunks = asoc->stats.rtxchunks;
5223 info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
5224 info->sctpi_idupchunks = asoc->stats.idupchunks;
5225 info->sctpi_gapcnt = asoc->stats.gapcnt;
5226 info->sctpi_ouodchunks = asoc->stats.ouodchunks;
5227 info->sctpi_iuodchunks = asoc->stats.iuodchunks;
5228 info->sctpi_oodchunks = asoc->stats.oodchunks;
5229 info->sctpi_iodchunks = asoc->stats.iodchunks;
5230 info->sctpi_octrlchunks = asoc->stats.octrlchunks;
5231 info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;
5232
5233 prim = asoc->peer.primary_path;
5234 memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
5235 info->sctpi_p_state = prim->state;
5236 info->sctpi_p_cwnd = prim->cwnd;
5237 info->sctpi_p_srtt = prim->srtt;
5238 info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
5239 info->sctpi_p_hbinterval = prim->hbinterval;
5240 info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
5241 info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
5242 info->sctpi_p_ssthresh = prim->ssthresh;
5243 info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
5244 info->sctpi_p_flight_size = prim->flight_size;
5245 info->sctpi_p_error = prim->error_count;
5246
5247 return 0;
5248 }
5249 EXPORT_SYMBOL_GPL(sctp_get_sctp_info);
5250
5251 /* use callback to avoid exporting the core structure */
sctp_transport_walk_start(struct rhashtable_iter * iter)5252 void sctp_transport_walk_start(struct rhashtable_iter *iter) __acquires(RCU)
5253 {
5254 rhltable_walk_enter(&sctp_transport_hashtable, iter);
5255
5256 rhashtable_walk_start(iter);
5257 }
5258
sctp_transport_walk_stop(struct rhashtable_iter * iter)5259 void sctp_transport_walk_stop(struct rhashtable_iter *iter) __releases(RCU)
5260 {
5261 rhashtable_walk_stop(iter);
5262 rhashtable_walk_exit(iter);
5263 }
5264
sctp_transport_get_next(struct net * net,struct rhashtable_iter * iter)5265 struct sctp_transport *sctp_transport_get_next(struct net *net,
5266 struct rhashtable_iter *iter)
5267 {
5268 struct sctp_transport *t;
5269
5270 t = rhashtable_walk_next(iter);
5271 for (; t; t = rhashtable_walk_next(iter)) {
5272 if (IS_ERR(t)) {
5273 if (PTR_ERR(t) == -EAGAIN)
5274 continue;
5275 break;
5276 }
5277
5278 if (!sctp_transport_hold(t))
5279 continue;
5280
5281 if (net_eq(t->asoc->base.net, net) &&
5282 t->asoc->peer.primary_path == t)
5283 break;
5284
5285 sctp_transport_put(t);
5286 }
5287
5288 return t;
5289 }
5290
sctp_transport_get_idx(struct net * net,struct rhashtable_iter * iter,int pos)5291 struct sctp_transport *sctp_transport_get_idx(struct net *net,
5292 struct rhashtable_iter *iter,
5293 int pos)
5294 {
5295 struct sctp_transport *t;
5296
5297 if (!pos)
5298 return SEQ_START_TOKEN;
5299
5300 while ((t = sctp_transport_get_next(net, iter)) && !IS_ERR(t)) {
5301 if (!--pos)
5302 break;
5303 sctp_transport_put(t);
5304 }
5305
5306 return t;
5307 }
5308
sctp_for_each_endpoint(int (* cb)(struct sctp_endpoint *,void *),void * p)5309 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
5310 void *p) {
5311 int err = 0;
5312 int hash = 0;
5313 struct sctp_endpoint *ep;
5314 struct sctp_hashbucket *head;
5315
5316 for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
5317 hash++, head++) {
5318 read_lock_bh(&head->lock);
5319 sctp_for_each_hentry(ep, &head->chain) {
5320 err = cb(ep, p);
5321 if (err)
5322 break;
5323 }
5324 read_unlock_bh(&head->lock);
5325 }
5326
5327 return err;
5328 }
5329 EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
5330
sctp_transport_lookup_process(sctp_callback_t cb,struct net * net,const union sctp_addr * laddr,const union sctp_addr * paddr,void * p,int dif)5331 int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
5332 const union sctp_addr *laddr,
5333 const union sctp_addr *paddr, void *p, int dif)
5334 {
5335 struct sctp_transport *transport;
5336 struct sctp_endpoint *ep;
5337 int err = -ENOENT;
5338
5339 rcu_read_lock();
5340 transport = sctp_addrs_lookup_transport(net, laddr, paddr, dif, dif);
5341 if (!transport) {
5342 rcu_read_unlock();
5343 return err;
5344 }
5345 ep = transport->asoc->ep;
5346 if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5347 sctp_transport_put(transport);
5348 rcu_read_unlock();
5349 return err;
5350 }
5351 rcu_read_unlock();
5352
5353 err = cb(ep, transport, p);
5354 sctp_endpoint_put(ep);
5355 sctp_transport_put(transport);
5356 return err;
5357 }
5358 EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);
5359
sctp_transport_traverse_process(sctp_callback_t cb,sctp_callback_t cb_done,struct net * net,int * pos,void * p)5360 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
5361 struct net *net, int *pos, void *p)
5362 {
5363 struct rhashtable_iter hti;
5364 struct sctp_transport *tsp;
5365 struct sctp_endpoint *ep;
5366 int ret;
5367
5368 again:
5369 ret = 0;
5370 sctp_transport_walk_start(&hti);
5371
5372 tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
5373 for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
5374 ep = tsp->asoc->ep;
5375 if (sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
5376 ret = cb(ep, tsp, p);
5377 if (ret)
5378 break;
5379 sctp_endpoint_put(ep);
5380 }
5381 (*pos)++;
5382 sctp_transport_put(tsp);
5383 }
5384 sctp_transport_walk_stop(&hti);
5385
5386 if (ret) {
5387 if (cb_done && !cb_done(ep, tsp, p)) {
5388 (*pos)++;
5389 sctp_endpoint_put(ep);
5390 sctp_transport_put(tsp);
5391 goto again;
5392 }
5393 sctp_endpoint_put(ep);
5394 sctp_transport_put(tsp);
5395 }
5396
5397 return ret;
5398 }
5399 EXPORT_SYMBOL_GPL(sctp_transport_traverse_process);
5400
5401 /* 7.2.1 Association Status (SCTP_STATUS)
5402
5403 * Applications can retrieve current status information about an
5404 * association, including association state, peer receiver window size,
5405 * number of unacked data chunks, and number of data chunks pending
5406 * receipt. This information is read-only.
5407 */
sctp_getsockopt_sctp_status(struct sock * sk,int len,char __user * optval,int __user * optlen)5408 static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
5409 char __user *optval,
5410 int __user *optlen)
5411 {
5412 struct sctp_status status;
5413 struct sctp_association *asoc = NULL;
5414 struct sctp_transport *transport;
5415 sctp_assoc_t associd;
5416 int retval = 0;
5417
5418 if (len < sizeof(status)) {
5419 retval = -EINVAL;
5420 goto out;
5421 }
5422
5423 len = sizeof(status);
5424 if (copy_from_user(&status, optval, len)) {
5425 retval = -EFAULT;
5426 goto out;
5427 }
5428
5429 associd = status.sstat_assoc_id;
5430 asoc = sctp_id2assoc(sk, associd);
5431 if (!asoc) {
5432 retval = -EINVAL;
5433 goto out;
5434 }
5435
5436 transport = asoc->peer.primary_path;
5437
5438 status.sstat_assoc_id = sctp_assoc2id(asoc);
5439 status.sstat_state = sctp_assoc_to_state(asoc);
5440 status.sstat_rwnd = asoc->peer.rwnd;
5441 status.sstat_unackdata = asoc->unack_data;
5442
5443 status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
5444 status.sstat_instrms = asoc->stream.incnt;
5445 status.sstat_outstrms = asoc->stream.outcnt;
5446 status.sstat_fragmentation_point = asoc->frag_point;
5447 status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5448 memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
5449 transport->af_specific->sockaddr_len);
5450 /* Map ipv4 address into v4-mapped-on-v6 address. */
5451 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
5452 (union sctp_addr *)&status.sstat_primary.spinfo_address);
5453 status.sstat_primary.spinfo_state = transport->state;
5454 status.sstat_primary.spinfo_cwnd = transport->cwnd;
5455 status.sstat_primary.spinfo_srtt = transport->srtt;
5456 status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
5457 status.sstat_primary.spinfo_mtu = transport->pathmtu;
5458
5459 if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
5460 status.sstat_primary.spinfo_state = SCTP_ACTIVE;
5461
5462 if (put_user(len, optlen)) {
5463 retval = -EFAULT;
5464 goto out;
5465 }
5466
5467 pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
5468 __func__, len, status.sstat_state, status.sstat_rwnd,
5469 status.sstat_assoc_id);
5470
5471 if (copy_to_user(optval, &status, len)) {
5472 retval = -EFAULT;
5473 goto out;
5474 }
5475
5476 out:
5477 return retval;
5478 }
5479
5480
5481 /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
5482 *
5483 * Applications can retrieve information about a specific peer address
5484 * of an association, including its reachability state, congestion
5485 * window, and retransmission timer values. This information is
5486 * read-only.
5487 */
sctp_getsockopt_peer_addr_info(struct sock * sk,int len,char __user * optval,int __user * optlen)5488 static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
5489 char __user *optval,
5490 int __user *optlen)
5491 {
5492 struct sctp_paddrinfo pinfo;
5493 struct sctp_transport *transport;
5494 int retval = 0;
5495
5496 if (len < sizeof(pinfo)) {
5497 retval = -EINVAL;
5498 goto out;
5499 }
5500
5501 len = sizeof(pinfo);
5502 if (copy_from_user(&pinfo, optval, len)) {
5503 retval = -EFAULT;
5504 goto out;
5505 }
5506
5507 transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
5508 pinfo.spinfo_assoc_id);
5509 if (!transport) {
5510 retval = -EINVAL;
5511 goto out;
5512 }
5513
5514 if (transport->state == SCTP_PF &&
5515 transport->asoc->pf_expose == SCTP_PF_EXPOSE_DISABLE) {
5516 retval = -EACCES;
5517 goto out;
5518 }
5519
5520 pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
5521 pinfo.spinfo_state = transport->state;
5522 pinfo.spinfo_cwnd = transport->cwnd;
5523 pinfo.spinfo_srtt = transport->srtt;
5524 pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
5525 pinfo.spinfo_mtu = transport->pathmtu;
5526
5527 if (pinfo.spinfo_state == SCTP_UNKNOWN)
5528 pinfo.spinfo_state = SCTP_ACTIVE;
5529
5530 if (put_user(len, optlen)) {
5531 retval = -EFAULT;
5532 goto out;
5533 }
5534
5535 if (copy_to_user(optval, &pinfo, len)) {
5536 retval = -EFAULT;
5537 goto out;
5538 }
5539
5540 out:
5541 return retval;
5542 }
5543
5544 /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
5545 *
5546 * This option is a on/off flag. If enabled no SCTP message
5547 * fragmentation will be performed. Instead if a message being sent
5548 * exceeds the current PMTU size, the message will NOT be sent and
5549 * instead a error will be indicated to the user.
5550 */
sctp_getsockopt_disable_fragments(struct sock * sk,int len,char __user * optval,int __user * optlen)5551 static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
5552 char __user *optval, int __user *optlen)
5553 {
5554 int val;
5555
5556 if (len < sizeof(int))
5557 return -EINVAL;
5558
5559 len = sizeof(int);
5560 val = (sctp_sk(sk)->disable_fragments == 1);
5561 if (put_user(len, optlen))
5562 return -EFAULT;
5563 if (copy_to_user(optval, &val, len))
5564 return -EFAULT;
5565 return 0;
5566 }
5567
5568 /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
5569 *
5570 * This socket option is used to specify various notifications and
5571 * ancillary data the user wishes to receive.
5572 */
sctp_getsockopt_events(struct sock * sk,int len,char __user * optval,int __user * optlen)5573 static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
5574 int __user *optlen)
5575 {
5576 struct sctp_event_subscribe subscribe;
5577 __u8 *sn_type = (__u8 *)&subscribe;
5578 int i;
5579
5580 if (len == 0)
5581 return -EINVAL;
5582 if (len > sizeof(struct sctp_event_subscribe))
5583 len = sizeof(struct sctp_event_subscribe);
5584 if (put_user(len, optlen))
5585 return -EFAULT;
5586
5587 for (i = 0; i < len; i++)
5588 sn_type[i] = sctp_ulpevent_type_enabled(sctp_sk(sk)->subscribe,
5589 SCTP_SN_TYPE_BASE + i);
5590
5591 if (copy_to_user(optval, &subscribe, len))
5592 return -EFAULT;
5593
5594 return 0;
5595 }
5596
5597 /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
5598 *
5599 * This socket option is applicable to the UDP-style socket only. When
5600 * set it will cause associations that are idle for more than the
5601 * specified number of seconds to automatically close. An association
5602 * being idle is defined an association that has NOT sent or received
5603 * user data. The special value of '0' indicates that no automatic
5604 * close of any associations should be performed. The option expects an
5605 * integer defining the number of seconds of idle time before an
5606 * association is closed.
5607 */
sctp_getsockopt_autoclose(struct sock * sk,int len,char __user * optval,int __user * optlen)5608 static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
5609 {
5610 /* Applicable to UDP-style socket only */
5611 if (sctp_style(sk, TCP))
5612 return -EOPNOTSUPP;
5613 if (len < sizeof(int))
5614 return -EINVAL;
5615 len = sizeof(int);
5616 if (put_user(len, optlen))
5617 return -EFAULT;
5618 if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
5619 return -EFAULT;
5620 return 0;
5621 }
5622
5623 /* Helper routine to branch off an association to a new socket. */
sctp_do_peeloff(struct sock * sk,sctp_assoc_t id,struct socket ** sockp)5624 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
5625 {
5626 struct sctp_association *asoc = sctp_id2assoc(sk, id);
5627 struct sctp_sock *sp = sctp_sk(sk);
5628 struct socket *sock;
5629 int err = 0;
5630
5631 /* Do not peel off from one netns to another one. */
5632 if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
5633 return -EINVAL;
5634
5635 if (!asoc)
5636 return -EINVAL;
5637
5638 /* An association cannot be branched off from an already peeled-off
5639 * socket, nor is this supported for tcp style sockets.
5640 */
5641 if (!sctp_style(sk, UDP))
5642 return -EINVAL;
5643
5644 /* Create a new socket. */
5645 err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
5646 if (err < 0)
5647 return err;
5648
5649 sctp_copy_sock(sock->sk, sk, asoc);
5650
5651 /* Make peeled-off sockets more like 1-1 accepted sockets.
5652 * Set the daddr and initialize id to something more random and also
5653 * copy over any ip options.
5654 */
5655 sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sock->sk);
5656 sp->pf->copy_ip_options(sk, sock->sk);
5657
5658 /* Populate the fields of the newsk from the oldsk and migrate the
5659 * asoc to the newsk.
5660 */
5661 err = sctp_sock_migrate(sk, sock->sk, asoc,
5662 SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5663 if (err) {
5664 sock_release(sock);
5665 sock = NULL;
5666 }
5667
5668 *sockp = sock;
5669
5670 return err;
5671 }
5672 EXPORT_SYMBOL(sctp_do_peeloff);
5673
sctp_getsockopt_peeloff_common(struct sock * sk,sctp_peeloff_arg_t * peeloff,struct file ** newfile,unsigned flags)5674 static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
5675 struct file **newfile, unsigned flags)
5676 {
5677 struct socket *newsock;
5678 int retval;
5679
5680 retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
5681 if (retval < 0)
5682 goto out;
5683
5684 /* Map the socket to an unused fd that can be returned to the user. */
5685 retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
5686 if (retval < 0) {
5687 sock_release(newsock);
5688 goto out;
5689 }
5690
5691 *newfile = sock_alloc_file(newsock, 0, NULL);
5692 if (IS_ERR(*newfile)) {
5693 put_unused_fd(retval);
5694 retval = PTR_ERR(*newfile);
5695 *newfile = NULL;
5696 return retval;
5697 }
5698
5699 pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
5700 retval);
5701
5702 peeloff->sd = retval;
5703
5704 if (flags & SOCK_NONBLOCK)
5705 (*newfile)->f_flags |= O_NONBLOCK;
5706 out:
5707 return retval;
5708 }
5709
sctp_getsockopt_peeloff(struct sock * sk,int len,char __user * optval,int __user * optlen)5710 static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
5711 {
5712 sctp_peeloff_arg_t peeloff;
5713 struct file *newfile = NULL;
5714 int retval = 0;
5715
5716 if (len < sizeof(sctp_peeloff_arg_t))
5717 return -EINVAL;
5718 len = sizeof(sctp_peeloff_arg_t);
5719 if (copy_from_user(&peeloff, optval, len))
5720 return -EFAULT;
5721
5722 retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
5723 if (retval < 0)
5724 goto out;
5725
5726 /* Return the fd mapped to the new socket. */
5727 if (put_user(len, optlen)) {
5728 fput(newfile);
5729 put_unused_fd(retval);
5730 return -EFAULT;
5731 }
5732
5733 if (copy_to_user(optval, &peeloff, len)) {
5734 fput(newfile);
5735 put_unused_fd(retval);
5736 return -EFAULT;
5737 }
5738 fd_install(retval, newfile);
5739 out:
5740 return retval;
5741 }
5742
sctp_getsockopt_peeloff_flags(struct sock * sk,int len,char __user * optval,int __user * optlen)5743 static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
5744 char __user *optval, int __user *optlen)
5745 {
5746 sctp_peeloff_flags_arg_t peeloff;
5747 struct file *newfile = NULL;
5748 int retval = 0;
5749
5750 if (len < sizeof(sctp_peeloff_flags_arg_t))
5751 return -EINVAL;
5752 len = sizeof(sctp_peeloff_flags_arg_t);
5753 if (copy_from_user(&peeloff, optval, len))
5754 return -EFAULT;
5755
5756 retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
5757 &newfile, peeloff.flags);
5758 if (retval < 0)
5759 goto out;
5760
5761 /* Return the fd mapped to the new socket. */
5762 if (put_user(len, optlen)) {
5763 fput(newfile);
5764 put_unused_fd(retval);
5765 return -EFAULT;
5766 }
5767
5768 if (copy_to_user(optval, &peeloff, len)) {
5769 fput(newfile);
5770 put_unused_fd(retval);
5771 return -EFAULT;
5772 }
5773 fd_install(retval, newfile);
5774 out:
5775 return retval;
5776 }
5777
5778 /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
5779 *
5780 * Applications can enable or disable heartbeats for any peer address of
5781 * an association, modify an address's heartbeat interval, force a
5782 * heartbeat to be sent immediately, and adjust the address's maximum
5783 * number of retransmissions sent before an address is considered
5784 * unreachable. The following structure is used to access and modify an
5785 * address's parameters:
5786 *
5787 * struct sctp_paddrparams {
5788 * sctp_assoc_t spp_assoc_id;
5789 * struct sockaddr_storage spp_address;
5790 * uint32_t spp_hbinterval;
5791 * uint16_t spp_pathmaxrxt;
5792 * uint32_t spp_pathmtu;
5793 * uint32_t spp_sackdelay;
5794 * uint32_t spp_flags;
5795 * };
5796 *
5797 * spp_assoc_id - (one-to-many style socket) This is filled in the
5798 * application, and identifies the association for
5799 * this query.
5800 * spp_address - This specifies which address is of interest.
5801 * spp_hbinterval - This contains the value of the heartbeat interval,
5802 * in milliseconds. If a value of zero
5803 * is present in this field then no changes are to
5804 * be made to this parameter.
5805 * spp_pathmaxrxt - This contains the maximum number of
5806 * retransmissions before this address shall be
5807 * considered unreachable. If a value of zero
5808 * is present in this field then no changes are to
5809 * be made to this parameter.
5810 * spp_pathmtu - When Path MTU discovery is disabled the value
5811 * specified here will be the "fixed" path mtu.
5812 * Note that if the spp_address field is empty
5813 * then all associations on this address will
5814 * have this fixed path mtu set upon them.
5815 *
5816 * spp_sackdelay - When delayed sack is enabled, this value specifies
5817 * the number of milliseconds that sacks will be delayed
5818 * for. This value will apply to all addresses of an
5819 * association if the spp_address field is empty. Note
5820 * also, that if delayed sack is enabled and this
5821 * value is set to 0, no change is made to the last
5822 * recorded delayed sack timer value.
5823 *
5824 * spp_flags - These flags are used to control various features
5825 * on an association. The flag field may contain
5826 * zero or more of the following options.
5827 *
5828 * SPP_HB_ENABLE - Enable heartbeats on the
5829 * specified address. Note that if the address
5830 * field is empty all addresses for the association
5831 * have heartbeats enabled upon them.
5832 *
5833 * SPP_HB_DISABLE - Disable heartbeats on the
5834 * speicifed address. Note that if the address
5835 * field is empty all addresses for the association
5836 * will have their heartbeats disabled. Note also
5837 * that SPP_HB_ENABLE and SPP_HB_DISABLE are
5838 * mutually exclusive, only one of these two should
5839 * be specified. Enabling both fields will have
5840 * undetermined results.
5841 *
5842 * SPP_HB_DEMAND - Request a user initiated heartbeat
5843 * to be made immediately.
5844 *
5845 * SPP_PMTUD_ENABLE - This field will enable PMTU
5846 * discovery upon the specified address. Note that
5847 * if the address feild is empty then all addresses
5848 * on the association are effected.
5849 *
5850 * SPP_PMTUD_DISABLE - This field will disable PMTU
5851 * discovery upon the specified address. Note that
5852 * if the address feild is empty then all addresses
5853 * on the association are effected. Not also that
5854 * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
5855 * exclusive. Enabling both will have undetermined
5856 * results.
5857 *
5858 * SPP_SACKDELAY_ENABLE - Setting this flag turns
5859 * on delayed sack. The time specified in spp_sackdelay
5860 * is used to specify the sack delay for this address. Note
5861 * that if spp_address is empty then all addresses will
5862 * enable delayed sack and take on the sack delay
5863 * value specified in spp_sackdelay.
5864 * SPP_SACKDELAY_DISABLE - Setting this flag turns
5865 * off delayed sack. If the spp_address field is blank then
5866 * delayed sack is disabled for the entire association. Note
5867 * also that this field is mutually exclusive to
5868 * SPP_SACKDELAY_ENABLE, setting both will have undefined
5869 * results.
5870 *
5871 * SPP_IPV6_FLOWLABEL: Setting this flag enables the
5872 * setting of the IPV6 flow label value. The value is
5873 * contained in the spp_ipv6_flowlabel field.
5874 * Upon retrieval, this flag will be set to indicate that
5875 * the spp_ipv6_flowlabel field has a valid value returned.
5876 * If a specific destination address is set (in the
5877 * spp_address field), then the value returned is that of
5878 * the address. If just an association is specified (and
5879 * no address), then the association's default flow label
5880 * is returned. If neither an association nor a destination
5881 * is specified, then the socket's default flow label is
5882 * returned. For non-IPv6 sockets, this flag will be left
5883 * cleared.
5884 *
5885 * SPP_DSCP: Setting this flag enables the setting of the
5886 * Differentiated Services Code Point (DSCP) value
5887 * associated with either the association or a specific
5888 * address. The value is obtained in the spp_dscp field.
5889 * Upon retrieval, this flag will be set to indicate that
5890 * the spp_dscp field has a valid value returned. If a
5891 * specific destination address is set when called (in the
5892 * spp_address field), then that specific destination
5893 * address's DSCP value is returned. If just an association
5894 * is specified, then the association's default DSCP is
5895 * returned. If neither an association nor a destination is
5896 * specified, then the socket's default DSCP is returned.
5897 *
5898 * spp_ipv6_flowlabel
5899 * - This field is used in conjunction with the
5900 * SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
5901 * The 20 least significant bits are used for the flow
5902 * label. This setting has precedence over any IPv6-layer
5903 * setting.
5904 *
5905 * spp_dscp - This field is used in conjunction with the SPP_DSCP flag
5906 * and contains the DSCP. The 6 most significant bits are
5907 * used for the DSCP. This setting has precedence over any
5908 * IPv4- or IPv6- layer setting.
5909 */
sctp_getsockopt_peer_addr_params(struct sock * sk,int len,char __user * optval,int __user * optlen)5910 static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5911 char __user *optval, int __user *optlen)
5912 {
5913 struct sctp_paddrparams params;
5914 struct sctp_transport *trans = NULL;
5915 struct sctp_association *asoc = NULL;
5916 struct sctp_sock *sp = sctp_sk(sk);
5917
5918 if (len >= sizeof(params))
5919 len = sizeof(params);
5920 else if (len >= ALIGN(offsetof(struct sctp_paddrparams,
5921 spp_ipv6_flowlabel), 4))
5922 len = ALIGN(offsetof(struct sctp_paddrparams,
5923 spp_ipv6_flowlabel), 4);
5924 else
5925 return -EINVAL;
5926
5927 if (copy_from_user(¶ms, optval, len))
5928 return -EFAULT;
5929
5930 /* If an address other than INADDR_ANY is specified, and
5931 * no transport is found, then the request is invalid.
5932 */
5933 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) {
5934 trans = sctp_addr_id2transport(sk, ¶ms.spp_address,
5935 params.spp_assoc_id);
5936 if (!trans) {
5937 pr_debug("%s: failed no transport\n", __func__);
5938 return -EINVAL;
5939 }
5940 }
5941
5942 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
5943 * socket is a one to many style socket, and an association
5944 * was not found, then the id was invalid.
5945 */
5946 asoc = sctp_id2assoc(sk, params.spp_assoc_id);
5947 if (!asoc && params.spp_assoc_id != SCTP_FUTURE_ASSOC &&
5948 sctp_style(sk, UDP)) {
5949 pr_debug("%s: failed no association\n", __func__);
5950 return -EINVAL;
5951 }
5952
5953 if (trans) {
5954 /* Fetch transport values. */
5955 params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
5956 params.spp_pathmtu = trans->pathmtu;
5957 params.spp_pathmaxrxt = trans->pathmaxrxt;
5958 params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay);
5959
5960 /*draft-11 doesn't say what to return in spp_flags*/
5961 params.spp_flags = trans->param_flags;
5962 if (trans->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5963 params.spp_ipv6_flowlabel = trans->flowlabel &
5964 SCTP_FLOWLABEL_VAL_MASK;
5965 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5966 }
5967 if (trans->dscp & SCTP_DSCP_SET_MASK) {
5968 params.spp_dscp = trans->dscp & SCTP_DSCP_VAL_MASK;
5969 params.spp_flags |= SPP_DSCP;
5970 }
5971 } else if (asoc) {
5972 /* Fetch association values. */
5973 params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
5974 params.spp_pathmtu = asoc->pathmtu;
5975 params.spp_pathmaxrxt = asoc->pathmaxrxt;
5976 params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay);
5977
5978 /*draft-11 doesn't say what to return in spp_flags*/
5979 params.spp_flags = asoc->param_flags;
5980 if (asoc->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5981 params.spp_ipv6_flowlabel = asoc->flowlabel &
5982 SCTP_FLOWLABEL_VAL_MASK;
5983 params.spp_flags |= SPP_IPV6_FLOWLABEL;
5984 }
5985 if (asoc->dscp & SCTP_DSCP_SET_MASK) {
5986 params.spp_dscp = asoc->dscp & SCTP_DSCP_VAL_MASK;
5987 params.spp_flags |= SPP_DSCP;
5988 }
5989 } else {
5990 /* Fetch socket values. */
5991 params.spp_hbinterval = sp->hbinterval;
5992 params.spp_pathmtu = sp->pathmtu;
5993 params.spp_sackdelay = sp->sackdelay;
5994 params.spp_pathmaxrxt = sp->pathmaxrxt;
5995
5996 /*draft-11 doesn't say what to return in spp_flags*/
5997 params.spp_flags = sp->param_flags;
5998 if (sp->flowlabel & SCTP_FLOWLABEL_SET_MASK) {
5999 params.spp_ipv6_flowlabel = sp->flowlabel &
6000 SCTP_FLOWLABEL_VAL_MASK;
6001 params.spp_flags |= SPP_IPV6_FLOWLABEL;
6002 }
6003 if (sp->dscp & SCTP_DSCP_SET_MASK) {
6004 params.spp_dscp = sp->dscp & SCTP_DSCP_VAL_MASK;
6005 params.spp_flags |= SPP_DSCP;
6006 }
6007 }
6008
6009 if (copy_to_user(optval, ¶ms, len))
6010 return -EFAULT;
6011
6012 if (put_user(len, optlen))
6013 return -EFAULT;
6014
6015 return 0;
6016 }
6017
6018 /*
6019 * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK)
6020 *
6021 * This option will effect the way delayed acks are performed. This
6022 * option allows you to get or set the delayed ack time, in
6023 * milliseconds. It also allows changing the delayed ack frequency.
6024 * Changing the frequency to 1 disables the delayed sack algorithm. If
6025 * the assoc_id is 0, then this sets or gets the endpoints default
6026 * values. If the assoc_id field is non-zero, then the set or get
6027 * effects the specified association for the one to many model (the
6028 * assoc_id field is ignored by the one to one model). Note that if
6029 * sack_delay or sack_freq are 0 when setting this option, then the
6030 * current values will remain unchanged.
6031 *
6032 * struct sctp_sack_info {
6033 * sctp_assoc_t sack_assoc_id;
6034 * uint32_t sack_delay;
6035 * uint32_t sack_freq;
6036 * };
6037 *
6038 * sack_assoc_id - This parameter, indicates which association the user
6039 * is performing an action upon. Note that if this field's value is
6040 * zero then the endpoints default value is changed (effecting future
6041 * associations only).
6042 *
6043 * sack_delay - This parameter contains the number of milliseconds that
6044 * the user is requesting the delayed ACK timer be set to. Note that
6045 * this value is defined in the standard to be between 200 and 500
6046 * milliseconds.
6047 *
6048 * sack_freq - This parameter contains the number of packets that must
6049 * be received before a sack is sent without waiting for the delay
6050 * timer to expire. The default value for this is 2, setting this
6051 * value to 1 will disable the delayed sack algorithm.
6052 */
sctp_getsockopt_delayed_ack(struct sock * sk,int len,char __user * optval,int __user * optlen)6053 static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
6054 char __user *optval,
6055 int __user *optlen)
6056 {
6057 struct sctp_sack_info params;
6058 struct sctp_association *asoc = NULL;
6059 struct sctp_sock *sp = sctp_sk(sk);
6060
6061 if (len >= sizeof(struct sctp_sack_info)) {
6062 len = sizeof(struct sctp_sack_info);
6063
6064 if (copy_from_user(¶ms, optval, len))
6065 return -EFAULT;
6066 } else if (len == sizeof(struct sctp_assoc_value)) {
6067 pr_warn_ratelimited(DEPRECATED
6068 "%s (pid %d) "
6069 "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
6070 "Use struct sctp_sack_info instead\n",
6071 current->comm, task_pid_nr(current));
6072 if (copy_from_user(¶ms, optval, len))
6073 return -EFAULT;
6074 } else
6075 return -EINVAL;
6076
6077 /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
6078 * socket is a one to many style socket, and an association
6079 * was not found, then the id was invalid.
6080 */
6081 asoc = sctp_id2assoc(sk, params.sack_assoc_id);
6082 if (!asoc && params.sack_assoc_id != SCTP_FUTURE_ASSOC &&
6083 sctp_style(sk, UDP))
6084 return -EINVAL;
6085
6086 if (asoc) {
6087 /* Fetch association values. */
6088 if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
6089 params.sack_delay = jiffies_to_msecs(asoc->sackdelay);
6090 params.sack_freq = asoc->sackfreq;
6091
6092 } else {
6093 params.sack_delay = 0;
6094 params.sack_freq = 1;
6095 }
6096 } else {
6097 /* Fetch socket values. */
6098 if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
6099 params.sack_delay = sp->sackdelay;
6100 params.sack_freq = sp->sackfreq;
6101 } else {
6102 params.sack_delay = 0;
6103 params.sack_freq = 1;
6104 }
6105 }
6106
6107 if (copy_to_user(optval, ¶ms, len))
6108 return -EFAULT;
6109
6110 if (put_user(len, optlen))
6111 return -EFAULT;
6112
6113 return 0;
6114 }
6115
6116 /* 7.1.3 Initialization Parameters (SCTP_INITMSG)
6117 *
6118 * Applications can specify protocol parameters for the default association
6119 * initialization. The option name argument to setsockopt() and getsockopt()
6120 * is SCTP_INITMSG.
6121 *
6122 * Setting initialization parameters is effective only on an unconnected
6123 * socket (for UDP-style sockets only future associations are effected
6124 * by the change). With TCP-style sockets, this option is inherited by
6125 * sockets derived from a listener socket.
6126 */
sctp_getsockopt_initmsg(struct sock * sk,int len,char __user * optval,int __user * optlen)6127 static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
6128 {
6129 if (len < sizeof(struct sctp_initmsg))
6130 return -EINVAL;
6131 len = sizeof(struct sctp_initmsg);
6132 if (put_user(len, optlen))
6133 return -EFAULT;
6134 if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
6135 return -EFAULT;
6136 return 0;
6137 }
6138
6139
sctp_getsockopt_peer_addrs(struct sock * sk,int len,char __user * optval,int __user * optlen)6140 static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
6141 char __user *optval, int __user *optlen)
6142 {
6143 struct sctp_association *asoc;
6144 int cnt = 0;
6145 struct sctp_getaddrs getaddrs;
6146 struct sctp_transport *from;
6147 void __user *to;
6148 union sctp_addr temp;
6149 struct sctp_sock *sp = sctp_sk(sk);
6150 int addrlen;
6151 size_t space_left;
6152 int bytes_copied;
6153
6154 if (len < sizeof(struct sctp_getaddrs))
6155 return -EINVAL;
6156
6157 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6158 return -EFAULT;
6159
6160 /* For UDP-style sockets, id specifies the association to query. */
6161 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6162 if (!asoc)
6163 return -EINVAL;
6164
6165 to = optval + offsetof(struct sctp_getaddrs, addrs);
6166 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6167
6168 list_for_each_entry(from, &asoc->peer.transport_addr_list,
6169 transports) {
6170 memcpy(&temp, &from->ipaddr, sizeof(temp));
6171 addrlen = sctp_get_pf_specific(sk->sk_family)
6172 ->addr_to_user(sp, &temp);
6173 if (space_left < addrlen)
6174 return -ENOMEM;
6175 if (copy_to_user(to, &temp, addrlen))
6176 return -EFAULT;
6177 to += addrlen;
6178 cnt++;
6179 space_left -= addrlen;
6180 }
6181
6182 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
6183 return -EFAULT;
6184 bytes_copied = ((char __user *)to) - optval;
6185 if (put_user(bytes_copied, optlen))
6186 return -EFAULT;
6187
6188 return 0;
6189 }
6190
sctp_copy_laddrs(struct sock * sk,__u16 port,void * to,size_t space_left,int * bytes_copied)6191 static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
6192 size_t space_left, int *bytes_copied)
6193 {
6194 struct sctp_sockaddr_entry *addr;
6195 union sctp_addr temp;
6196 int cnt = 0;
6197 int addrlen;
6198 struct net *net = sock_net(sk);
6199
6200 rcu_read_lock();
6201 list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
6202 if (!addr->valid)
6203 continue;
6204
6205 if ((PF_INET == sk->sk_family) &&
6206 (AF_INET6 == addr->a.sa.sa_family))
6207 continue;
6208 if ((PF_INET6 == sk->sk_family) &&
6209 inet_v6_ipv6only(sk) &&
6210 (AF_INET == addr->a.sa.sa_family))
6211 continue;
6212 memcpy(&temp, &addr->a, sizeof(temp));
6213 if (!temp.v4.sin_port)
6214 temp.v4.sin_port = htons(port);
6215
6216 addrlen = sctp_get_pf_specific(sk->sk_family)
6217 ->addr_to_user(sctp_sk(sk), &temp);
6218
6219 if (space_left < addrlen) {
6220 cnt = -ENOMEM;
6221 break;
6222 }
6223 memcpy(to, &temp, addrlen);
6224
6225 to += addrlen;
6226 cnt++;
6227 space_left -= addrlen;
6228 *bytes_copied += addrlen;
6229 }
6230 rcu_read_unlock();
6231
6232 return cnt;
6233 }
6234
6235
sctp_getsockopt_local_addrs(struct sock * sk,int len,char __user * optval,int __user * optlen)6236 static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
6237 char __user *optval, int __user *optlen)
6238 {
6239 struct sctp_bind_addr *bp;
6240 struct sctp_association *asoc;
6241 int cnt = 0;
6242 struct sctp_getaddrs getaddrs;
6243 struct sctp_sockaddr_entry *addr;
6244 void __user *to;
6245 union sctp_addr temp;
6246 struct sctp_sock *sp = sctp_sk(sk);
6247 int addrlen;
6248 int err = 0;
6249 size_t space_left;
6250 int bytes_copied = 0;
6251 void *addrs;
6252 void *buf;
6253
6254 if (len < sizeof(struct sctp_getaddrs))
6255 return -EINVAL;
6256
6257 if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
6258 return -EFAULT;
6259
6260 /*
6261 * For UDP-style sockets, id specifies the association to query.
6262 * If the id field is set to the value '0' then the locally bound
6263 * addresses are returned without regard to any particular
6264 * association.
6265 */
6266 if (0 == getaddrs.assoc_id) {
6267 bp = &sctp_sk(sk)->ep->base.bind_addr;
6268 } else {
6269 asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
6270 if (!asoc)
6271 return -EINVAL;
6272 bp = &asoc->base.bind_addr;
6273 }
6274
6275 to = optval + offsetof(struct sctp_getaddrs, addrs);
6276 space_left = len - offsetof(struct sctp_getaddrs, addrs);
6277
6278 addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
6279 if (!addrs)
6280 return -ENOMEM;
6281
6282 /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
6283 * addresses from the global local address list.
6284 */
6285 if (sctp_list_single_entry(&bp->address_list)) {
6286 addr = list_entry(bp->address_list.next,
6287 struct sctp_sockaddr_entry, list);
6288 if (sctp_is_any(sk, &addr->a)) {
6289 cnt = sctp_copy_laddrs(sk, bp->port, addrs,
6290 space_left, &bytes_copied);
6291 if (cnt < 0) {
6292 err = cnt;
6293 goto out;
6294 }
6295 goto copy_getaddrs;
6296 }
6297 }
6298
6299 buf = addrs;
6300 /* Protection on the bound address list is not needed since
6301 * in the socket option context we hold a socket lock and
6302 * thus the bound address list can't change.
6303 */
6304 list_for_each_entry(addr, &bp->address_list, list) {
6305 memcpy(&temp, &addr->a, sizeof(temp));
6306 addrlen = sctp_get_pf_specific(sk->sk_family)
6307 ->addr_to_user(sp, &temp);
6308 if (space_left < addrlen) {
6309 err = -ENOMEM; /*fixme: right error?*/
6310 goto out;
6311 }
6312 memcpy(buf, &temp, addrlen);
6313 buf += addrlen;
6314 bytes_copied += addrlen;
6315 cnt++;
6316 space_left -= addrlen;
6317 }
6318
6319 copy_getaddrs:
6320 if (copy_to_user(to, addrs, bytes_copied)) {
6321 err = -EFAULT;
6322 goto out;
6323 }
6324 if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
6325 err = -EFAULT;
6326 goto out;
6327 }
6328 /* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
6329 * but we can't change it anymore.
6330 */
6331 if (put_user(bytes_copied, optlen))
6332 err = -EFAULT;
6333 out:
6334 kfree(addrs);
6335 return err;
6336 }
6337
6338 /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
6339 *
6340 * Requests that the local SCTP stack use the enclosed peer address as
6341 * the association primary. The enclosed address must be one of the
6342 * association peer's addresses.
6343 */
sctp_getsockopt_primary_addr(struct sock * sk,int len,char __user * optval,int __user * optlen)6344 static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
6345 char __user *optval, int __user *optlen)
6346 {
6347 struct sctp_prim prim;
6348 struct sctp_association *asoc;
6349 struct sctp_sock *sp = sctp_sk(sk);
6350
6351 if (len < sizeof(struct sctp_prim))
6352 return -EINVAL;
6353
6354 len = sizeof(struct sctp_prim);
6355
6356 if (copy_from_user(&prim, optval, len))
6357 return -EFAULT;
6358
6359 asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
6360 if (!asoc)
6361 return -EINVAL;
6362
6363 if (!asoc->peer.primary_path)
6364 return -ENOTCONN;
6365
6366 memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
6367 asoc->peer.primary_path->af_specific->sockaddr_len);
6368
6369 sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
6370 (union sctp_addr *)&prim.ssp_addr);
6371
6372 if (put_user(len, optlen))
6373 return -EFAULT;
6374 if (copy_to_user(optval, &prim, len))
6375 return -EFAULT;
6376
6377 return 0;
6378 }
6379
6380 /*
6381 * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
6382 *
6383 * Requests that the local endpoint set the specified Adaptation Layer
6384 * Indication parameter for all future INIT and INIT-ACK exchanges.
6385 */
sctp_getsockopt_adaptation_layer(struct sock * sk,int len,char __user * optval,int __user * optlen)6386 static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
6387 char __user *optval, int __user *optlen)
6388 {
6389 struct sctp_setadaptation adaptation;
6390
6391 if (len < sizeof(struct sctp_setadaptation))
6392 return -EINVAL;
6393
6394 len = sizeof(struct sctp_setadaptation);
6395
6396 adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
6397
6398 if (put_user(len, optlen))
6399 return -EFAULT;
6400 if (copy_to_user(optval, &adaptation, len))
6401 return -EFAULT;
6402
6403 return 0;
6404 }
6405
6406 /*
6407 *
6408 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
6409 *
6410 * Applications that wish to use the sendto() system call may wish to
6411 * specify a default set of parameters that would normally be supplied
6412 * through the inclusion of ancillary data. This socket option allows
6413 * such an application to set the default sctp_sndrcvinfo structure.
6414
6415
6416 * The application that wishes to use this socket option simply passes
6417 * in to this call the sctp_sndrcvinfo structure defined in Section
6418 * 5.2.2) The input parameters accepted by this call include
6419 * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
6420 * sinfo_timetolive. The user must provide the sinfo_assoc_id field in
6421 * to this call if the caller is using the UDP model.
6422 *
6423 * For getsockopt, it get the default sctp_sndrcvinfo structure.
6424 */
sctp_getsockopt_default_send_param(struct sock * sk,int len,char __user * optval,int __user * optlen)6425 static int sctp_getsockopt_default_send_param(struct sock *sk,
6426 int len, char __user *optval,
6427 int __user *optlen)
6428 {
6429 struct sctp_sock *sp = sctp_sk(sk);
6430 struct sctp_association *asoc;
6431 struct sctp_sndrcvinfo info;
6432
6433 if (len < sizeof(info))
6434 return -EINVAL;
6435
6436 len = sizeof(info);
6437
6438 if (copy_from_user(&info, optval, len))
6439 return -EFAULT;
6440
6441 asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
6442 if (!asoc && info.sinfo_assoc_id != SCTP_FUTURE_ASSOC &&
6443 sctp_style(sk, UDP))
6444 return -EINVAL;
6445
6446 if (asoc) {
6447 info.sinfo_stream = asoc->default_stream;
6448 info.sinfo_flags = asoc->default_flags;
6449 info.sinfo_ppid = asoc->default_ppid;
6450 info.sinfo_context = asoc->default_context;
6451 info.sinfo_timetolive = asoc->default_timetolive;
6452 } else {
6453 info.sinfo_stream = sp->default_stream;
6454 info.sinfo_flags = sp->default_flags;
6455 info.sinfo_ppid = sp->default_ppid;
6456 info.sinfo_context = sp->default_context;
6457 info.sinfo_timetolive = sp->default_timetolive;
6458 }
6459
6460 if (put_user(len, optlen))
6461 return -EFAULT;
6462 if (copy_to_user(optval, &info, len))
6463 return -EFAULT;
6464
6465 return 0;
6466 }
6467
6468 /* RFC6458, Section 8.1.31. Set/get Default Send Parameters
6469 * (SCTP_DEFAULT_SNDINFO)
6470 */
sctp_getsockopt_default_sndinfo(struct sock * sk,int len,char __user * optval,int __user * optlen)6471 static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
6472 char __user *optval,
6473 int __user *optlen)
6474 {
6475 struct sctp_sock *sp = sctp_sk(sk);
6476 struct sctp_association *asoc;
6477 struct sctp_sndinfo info;
6478
6479 if (len < sizeof(info))
6480 return -EINVAL;
6481
6482 len = sizeof(info);
6483
6484 if (copy_from_user(&info, optval, len))
6485 return -EFAULT;
6486
6487 asoc = sctp_id2assoc(sk, info.snd_assoc_id);
6488 if (!asoc && info.snd_assoc_id != SCTP_FUTURE_ASSOC &&
6489 sctp_style(sk, UDP))
6490 return -EINVAL;
6491
6492 if (asoc) {
6493 info.snd_sid = asoc->default_stream;
6494 info.snd_flags = asoc->default_flags;
6495 info.snd_ppid = asoc->default_ppid;
6496 info.snd_context = asoc->default_context;
6497 } else {
6498 info.snd_sid = sp->default_stream;
6499 info.snd_flags = sp->default_flags;
6500 info.snd_ppid = sp->default_ppid;
6501 info.snd_context = sp->default_context;
6502 }
6503
6504 if (put_user(len, optlen))
6505 return -EFAULT;
6506 if (copy_to_user(optval, &info, len))
6507 return -EFAULT;
6508
6509 return 0;
6510 }
6511
6512 /*
6513 *
6514 * 7.1.5 SCTP_NODELAY
6515 *
6516 * Turn on/off any Nagle-like algorithm. This means that packets are
6517 * generally sent as soon as possible and no unnecessary delays are
6518 * introduced, at the cost of more packets in the network. Expects an
6519 * integer boolean flag.
6520 */
6521
sctp_getsockopt_nodelay(struct sock * sk,int len,char __user * optval,int __user * optlen)6522 static int sctp_getsockopt_nodelay(struct sock *sk, int len,
6523 char __user *optval, int __user *optlen)
6524 {
6525 int val;
6526
6527 if (len < sizeof(int))
6528 return -EINVAL;
6529
6530 len = sizeof(int);
6531 val = (sctp_sk(sk)->nodelay == 1);
6532 if (put_user(len, optlen))
6533 return -EFAULT;
6534 if (copy_to_user(optval, &val, len))
6535 return -EFAULT;
6536 return 0;
6537 }
6538
6539 /*
6540 *
6541 * 7.1.1 SCTP_RTOINFO
6542 *
6543 * The protocol parameters used to initialize and bound retransmission
6544 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
6545 * and modify these parameters.
6546 * All parameters are time values, in milliseconds. A value of 0, when
6547 * modifying the parameters, indicates that the current value should not
6548 * be changed.
6549 *
6550 */
sctp_getsockopt_rtoinfo(struct sock * sk,int len,char __user * optval,int __user * optlen)6551 static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
6552 char __user *optval,
6553 int __user *optlen) {
6554 struct sctp_rtoinfo rtoinfo;
6555 struct sctp_association *asoc;
6556
6557 if (len < sizeof (struct sctp_rtoinfo))
6558 return -EINVAL;
6559
6560 len = sizeof(struct sctp_rtoinfo);
6561
6562 if (copy_from_user(&rtoinfo, optval, len))
6563 return -EFAULT;
6564
6565 asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
6566
6567 if (!asoc && rtoinfo.srto_assoc_id != SCTP_FUTURE_ASSOC &&
6568 sctp_style(sk, UDP))
6569 return -EINVAL;
6570
6571 /* Values corresponding to the specific association. */
6572 if (asoc) {
6573 rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
6574 rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
6575 rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
6576 } else {
6577 /* Values corresponding to the endpoint. */
6578 struct sctp_sock *sp = sctp_sk(sk);
6579
6580 rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
6581 rtoinfo.srto_max = sp->rtoinfo.srto_max;
6582 rtoinfo.srto_min = sp->rtoinfo.srto_min;
6583 }
6584
6585 if (put_user(len, optlen))
6586 return -EFAULT;
6587
6588 if (copy_to_user(optval, &rtoinfo, len))
6589 return -EFAULT;
6590
6591 return 0;
6592 }
6593
6594 /*
6595 *
6596 * 7.1.2 SCTP_ASSOCINFO
6597 *
6598 * This option is used to tune the maximum retransmission attempts
6599 * of the association.
6600 * Returns an error if the new association retransmission value is
6601 * greater than the sum of the retransmission value of the peer.
6602 * See [SCTP] for more information.
6603 *
6604 */
sctp_getsockopt_associnfo(struct sock * sk,int len,char __user * optval,int __user * optlen)6605 static int sctp_getsockopt_associnfo(struct sock *sk, int len,
6606 char __user *optval,
6607 int __user *optlen)
6608 {
6609
6610 struct sctp_assocparams assocparams;
6611 struct sctp_association *asoc;
6612 struct list_head *pos;
6613 int cnt = 0;
6614
6615 if (len < sizeof (struct sctp_assocparams))
6616 return -EINVAL;
6617
6618 len = sizeof(struct sctp_assocparams);
6619
6620 if (copy_from_user(&assocparams, optval, len))
6621 return -EFAULT;
6622
6623 asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
6624
6625 if (!asoc && assocparams.sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
6626 sctp_style(sk, UDP))
6627 return -EINVAL;
6628
6629 /* Values correspoinding to the specific association */
6630 if (asoc) {
6631 assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
6632 assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
6633 assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6634 assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
6635
6636 list_for_each(pos, &asoc->peer.transport_addr_list) {
6637 cnt++;
6638 }
6639
6640 assocparams.sasoc_number_peer_destinations = cnt;
6641 } else {
6642 /* Values corresponding to the endpoint */
6643 struct sctp_sock *sp = sctp_sk(sk);
6644
6645 assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
6646 assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
6647 assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
6648 assocparams.sasoc_cookie_life =
6649 sp->assocparams.sasoc_cookie_life;
6650 assocparams.sasoc_number_peer_destinations =
6651 sp->assocparams.
6652 sasoc_number_peer_destinations;
6653 }
6654
6655 if (put_user(len, optlen))
6656 return -EFAULT;
6657
6658 if (copy_to_user(optval, &assocparams, len))
6659 return -EFAULT;
6660
6661 return 0;
6662 }
6663
6664 /*
6665 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
6666 *
6667 * This socket option is a boolean flag which turns on or off mapped V4
6668 * addresses. If this option is turned on and the socket is type
6669 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
6670 * If this option is turned off, then no mapping will be done of V4
6671 * addresses and a user will receive both PF_INET6 and PF_INET type
6672 * addresses on the socket.
6673 */
sctp_getsockopt_mappedv4(struct sock * sk,int len,char __user * optval,int __user * optlen)6674 static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
6675 char __user *optval, int __user *optlen)
6676 {
6677 int val;
6678 struct sctp_sock *sp = sctp_sk(sk);
6679
6680 if (len < sizeof(int))
6681 return -EINVAL;
6682
6683 len = sizeof(int);
6684 val = sp->v4mapped;
6685 if (put_user(len, optlen))
6686 return -EFAULT;
6687 if (copy_to_user(optval, &val, len))
6688 return -EFAULT;
6689
6690 return 0;
6691 }
6692
6693 /*
6694 * 7.1.29. Set or Get the default context (SCTP_CONTEXT)
6695 * (chapter and verse is quoted at sctp_setsockopt_context())
6696 */
sctp_getsockopt_context(struct sock * sk,int len,char __user * optval,int __user * optlen)6697 static int sctp_getsockopt_context(struct sock *sk, int len,
6698 char __user *optval, int __user *optlen)
6699 {
6700 struct sctp_assoc_value params;
6701 struct sctp_association *asoc;
6702
6703 if (len < sizeof(struct sctp_assoc_value))
6704 return -EINVAL;
6705
6706 len = sizeof(struct sctp_assoc_value);
6707
6708 if (copy_from_user(¶ms, optval, len))
6709 return -EFAULT;
6710
6711 asoc = sctp_id2assoc(sk, params.assoc_id);
6712 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6713 sctp_style(sk, UDP))
6714 return -EINVAL;
6715
6716 params.assoc_value = asoc ? asoc->default_rcv_context
6717 : sctp_sk(sk)->default_rcv_context;
6718
6719 if (put_user(len, optlen))
6720 return -EFAULT;
6721 if (copy_to_user(optval, ¶ms, len))
6722 return -EFAULT;
6723
6724 return 0;
6725 }
6726
6727 /*
6728 * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
6729 * This option will get or set the maximum size to put in any outgoing
6730 * SCTP DATA chunk. If a message is larger than this size it will be
6731 * fragmented by SCTP into the specified size. Note that the underlying
6732 * SCTP implementation may fragment into smaller sized chunks when the
6733 * PMTU of the underlying association is smaller than the value set by
6734 * the user. The default value for this option is '0' which indicates
6735 * the user is NOT limiting fragmentation and only the PMTU will effect
6736 * SCTP's choice of DATA chunk size. Note also that values set larger
6737 * than the maximum size of an IP datagram will effectively let SCTP
6738 * control fragmentation (i.e. the same as setting this option to 0).
6739 *
6740 * The following structure is used to access and modify this parameter:
6741 *
6742 * struct sctp_assoc_value {
6743 * sctp_assoc_t assoc_id;
6744 * uint32_t assoc_value;
6745 * };
6746 *
6747 * assoc_id: This parameter is ignored for one-to-one style sockets.
6748 * For one-to-many style sockets this parameter indicates which
6749 * association the user is performing an action upon. Note that if
6750 * this field's value is zero then the endpoints default value is
6751 * changed (effecting future associations only).
6752 * assoc_value: This parameter specifies the maximum size in bytes.
6753 */
sctp_getsockopt_maxseg(struct sock * sk,int len,char __user * optval,int __user * optlen)6754 static int sctp_getsockopt_maxseg(struct sock *sk, int len,
6755 char __user *optval, int __user *optlen)
6756 {
6757 struct sctp_assoc_value params;
6758 struct sctp_association *asoc;
6759
6760 if (len == sizeof(int)) {
6761 pr_warn_ratelimited(DEPRECATED
6762 "%s (pid %d) "
6763 "Use of int in maxseg socket option.\n"
6764 "Use struct sctp_assoc_value instead\n",
6765 current->comm, task_pid_nr(current));
6766 params.assoc_id = SCTP_FUTURE_ASSOC;
6767 } else if (len >= sizeof(struct sctp_assoc_value)) {
6768 len = sizeof(struct sctp_assoc_value);
6769 if (copy_from_user(¶ms, optval, len))
6770 return -EFAULT;
6771 } else
6772 return -EINVAL;
6773
6774 asoc = sctp_id2assoc(sk, params.assoc_id);
6775 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6776 sctp_style(sk, UDP))
6777 return -EINVAL;
6778
6779 if (asoc)
6780 params.assoc_value = asoc->frag_point;
6781 else
6782 params.assoc_value = sctp_sk(sk)->user_frag;
6783
6784 if (put_user(len, optlen))
6785 return -EFAULT;
6786 if (len == sizeof(int)) {
6787 if (copy_to_user(optval, ¶ms.assoc_value, len))
6788 return -EFAULT;
6789 } else {
6790 if (copy_to_user(optval, ¶ms, len))
6791 return -EFAULT;
6792 }
6793
6794 return 0;
6795 }
6796
6797 /*
6798 * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
6799 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
6800 */
sctp_getsockopt_fragment_interleave(struct sock * sk,int len,char __user * optval,int __user * optlen)6801 static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
6802 char __user *optval, int __user *optlen)
6803 {
6804 int val;
6805
6806 if (len < sizeof(int))
6807 return -EINVAL;
6808
6809 len = sizeof(int);
6810
6811 val = sctp_sk(sk)->frag_interleave;
6812 if (put_user(len, optlen))
6813 return -EFAULT;
6814 if (copy_to_user(optval, &val, len))
6815 return -EFAULT;
6816
6817 return 0;
6818 }
6819
6820 /*
6821 * 7.1.25. Set or Get the sctp partial delivery point
6822 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
6823 */
sctp_getsockopt_partial_delivery_point(struct sock * sk,int len,char __user * optval,int __user * optlen)6824 static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
6825 char __user *optval,
6826 int __user *optlen)
6827 {
6828 u32 val;
6829
6830 if (len < sizeof(u32))
6831 return -EINVAL;
6832
6833 len = sizeof(u32);
6834
6835 val = sctp_sk(sk)->pd_point;
6836 if (put_user(len, optlen))
6837 return -EFAULT;
6838 if (copy_to_user(optval, &val, len))
6839 return -EFAULT;
6840
6841 return 0;
6842 }
6843
6844 /*
6845 * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST)
6846 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
6847 */
sctp_getsockopt_maxburst(struct sock * sk,int len,char __user * optval,int __user * optlen)6848 static int sctp_getsockopt_maxburst(struct sock *sk, int len,
6849 char __user *optval,
6850 int __user *optlen)
6851 {
6852 struct sctp_assoc_value params;
6853 struct sctp_association *asoc;
6854
6855 if (len == sizeof(int)) {
6856 pr_warn_ratelimited(DEPRECATED
6857 "%s (pid %d) "
6858 "Use of int in max_burst socket option.\n"
6859 "Use struct sctp_assoc_value instead\n",
6860 current->comm, task_pid_nr(current));
6861 params.assoc_id = SCTP_FUTURE_ASSOC;
6862 } else if (len >= sizeof(struct sctp_assoc_value)) {
6863 len = sizeof(struct sctp_assoc_value);
6864 if (copy_from_user(¶ms, optval, len))
6865 return -EFAULT;
6866 } else
6867 return -EINVAL;
6868
6869 asoc = sctp_id2assoc(sk, params.assoc_id);
6870 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
6871 sctp_style(sk, UDP))
6872 return -EINVAL;
6873
6874 params.assoc_value = asoc ? asoc->max_burst : sctp_sk(sk)->max_burst;
6875
6876 if (len == sizeof(int)) {
6877 if (copy_to_user(optval, ¶ms.assoc_value, len))
6878 return -EFAULT;
6879 } else {
6880 if (copy_to_user(optval, ¶ms, len))
6881 return -EFAULT;
6882 }
6883
6884 return 0;
6885
6886 }
6887
sctp_getsockopt_hmac_ident(struct sock * sk,int len,char __user * optval,int __user * optlen)6888 static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
6889 char __user *optval, int __user *optlen)
6890 {
6891 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6892 struct sctp_hmacalgo __user *p = (void __user *)optval;
6893 struct sctp_hmac_algo_param *hmacs;
6894 __u16 data_len = 0;
6895 u32 num_idents;
6896 int i;
6897
6898 if (!ep->auth_enable)
6899 return -EACCES;
6900
6901 hmacs = ep->auth_hmacs_list;
6902 data_len = ntohs(hmacs->param_hdr.length) -
6903 sizeof(struct sctp_paramhdr);
6904
6905 if (len < sizeof(struct sctp_hmacalgo) + data_len)
6906 return -EINVAL;
6907
6908 len = sizeof(struct sctp_hmacalgo) + data_len;
6909 num_idents = data_len / sizeof(u16);
6910
6911 if (put_user(len, optlen))
6912 return -EFAULT;
6913 if (put_user(num_idents, &p->shmac_num_idents))
6914 return -EFAULT;
6915 for (i = 0; i < num_idents; i++) {
6916 __u16 hmacid = ntohs(hmacs->hmac_ids[i]);
6917
6918 if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
6919 return -EFAULT;
6920 }
6921 return 0;
6922 }
6923
sctp_getsockopt_active_key(struct sock * sk,int len,char __user * optval,int __user * optlen)6924 static int sctp_getsockopt_active_key(struct sock *sk, int len,
6925 char __user *optval, int __user *optlen)
6926 {
6927 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6928 struct sctp_authkeyid val;
6929 struct sctp_association *asoc;
6930
6931 if (len < sizeof(struct sctp_authkeyid))
6932 return -EINVAL;
6933
6934 len = sizeof(struct sctp_authkeyid);
6935 if (copy_from_user(&val, optval, len))
6936 return -EFAULT;
6937
6938 asoc = sctp_id2assoc(sk, val.scact_assoc_id);
6939 if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
6940 return -EINVAL;
6941
6942 if (asoc) {
6943 if (!asoc->peer.auth_capable)
6944 return -EACCES;
6945 val.scact_keynumber = asoc->active_key_id;
6946 } else {
6947 if (!ep->auth_enable)
6948 return -EACCES;
6949 val.scact_keynumber = ep->active_key_id;
6950 }
6951
6952 if (put_user(len, optlen))
6953 return -EFAULT;
6954 if (copy_to_user(optval, &val, len))
6955 return -EFAULT;
6956
6957 return 0;
6958 }
6959
sctp_getsockopt_peer_auth_chunks(struct sock * sk,int len,char __user * optval,int __user * optlen)6960 static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
6961 char __user *optval, int __user *optlen)
6962 {
6963 struct sctp_authchunks __user *p = (void __user *)optval;
6964 struct sctp_authchunks val;
6965 struct sctp_association *asoc;
6966 struct sctp_chunks_param *ch;
6967 u32 num_chunks = 0;
6968 char __user *to;
6969
6970 if (len < sizeof(struct sctp_authchunks))
6971 return -EINVAL;
6972
6973 if (copy_from_user(&val, optval, sizeof(val)))
6974 return -EFAULT;
6975
6976 to = p->gauth_chunks;
6977 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
6978 if (!asoc)
6979 return -EINVAL;
6980
6981 if (!asoc->peer.auth_capable)
6982 return -EACCES;
6983
6984 ch = asoc->peer.peer_chunks;
6985 if (!ch)
6986 goto num;
6987
6988 /* See if the user provided enough room for all the data */
6989 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6990 if (len < num_chunks)
6991 return -EINVAL;
6992
6993 if (copy_to_user(to, ch->chunks, num_chunks))
6994 return -EFAULT;
6995 num:
6996 len = sizeof(struct sctp_authchunks) + num_chunks;
6997 if (put_user(len, optlen))
6998 return -EFAULT;
6999 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7000 return -EFAULT;
7001 return 0;
7002 }
7003
sctp_getsockopt_local_auth_chunks(struct sock * sk,int len,char __user * optval,int __user * optlen)7004 static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
7005 char __user *optval, int __user *optlen)
7006 {
7007 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
7008 struct sctp_authchunks __user *p = (void __user *)optval;
7009 struct sctp_authchunks val;
7010 struct sctp_association *asoc;
7011 struct sctp_chunks_param *ch;
7012 u32 num_chunks = 0;
7013 char __user *to;
7014
7015 if (len < sizeof(struct sctp_authchunks))
7016 return -EINVAL;
7017
7018 if (copy_from_user(&val, optval, sizeof(val)))
7019 return -EFAULT;
7020
7021 to = p->gauth_chunks;
7022 asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
7023 if (!asoc && val.gauth_assoc_id != SCTP_FUTURE_ASSOC &&
7024 sctp_style(sk, UDP))
7025 return -EINVAL;
7026
7027 if (asoc) {
7028 if (!asoc->peer.auth_capable)
7029 return -EACCES;
7030 ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
7031 } else {
7032 if (!ep->auth_enable)
7033 return -EACCES;
7034 ch = ep->auth_chunk_list;
7035 }
7036 if (!ch)
7037 goto num;
7038
7039 num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
7040 if (len < sizeof(struct sctp_authchunks) + num_chunks)
7041 return -EINVAL;
7042
7043 if (copy_to_user(to, ch->chunks, num_chunks))
7044 return -EFAULT;
7045 num:
7046 len = sizeof(struct sctp_authchunks) + num_chunks;
7047 if (put_user(len, optlen))
7048 return -EFAULT;
7049 if (put_user(num_chunks, &p->gauth_number_of_chunks))
7050 return -EFAULT;
7051
7052 return 0;
7053 }
7054
7055 /*
7056 * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
7057 * This option gets the current number of associations that are attached
7058 * to a one-to-many style socket. The option value is an uint32_t.
7059 */
sctp_getsockopt_assoc_number(struct sock * sk,int len,char __user * optval,int __user * optlen)7060 static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
7061 char __user *optval, int __user *optlen)
7062 {
7063 struct sctp_sock *sp = sctp_sk(sk);
7064 struct sctp_association *asoc;
7065 u32 val = 0;
7066
7067 if (sctp_style(sk, TCP))
7068 return -EOPNOTSUPP;
7069
7070 if (len < sizeof(u32))
7071 return -EINVAL;
7072
7073 len = sizeof(u32);
7074
7075 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7076 val++;
7077 }
7078
7079 if (put_user(len, optlen))
7080 return -EFAULT;
7081 if (copy_to_user(optval, &val, len))
7082 return -EFAULT;
7083
7084 return 0;
7085 }
7086
7087 /*
7088 * 8.1.23 SCTP_AUTO_ASCONF
7089 * See the corresponding setsockopt entry as description
7090 */
sctp_getsockopt_auto_asconf(struct sock * sk,int len,char __user * optval,int __user * optlen)7091 static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
7092 char __user *optval, int __user *optlen)
7093 {
7094 int val = 0;
7095
7096 if (len < sizeof(int))
7097 return -EINVAL;
7098
7099 len = sizeof(int);
7100 if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
7101 val = 1;
7102 if (put_user(len, optlen))
7103 return -EFAULT;
7104 if (copy_to_user(optval, &val, len))
7105 return -EFAULT;
7106 return 0;
7107 }
7108
7109 /*
7110 * 8.2.6. Get the Current Identifiers of Associations
7111 * (SCTP_GET_ASSOC_ID_LIST)
7112 *
7113 * This option gets the current list of SCTP association identifiers of
7114 * the SCTP associations handled by a one-to-many style socket.
7115 */
sctp_getsockopt_assoc_ids(struct sock * sk,int len,char __user * optval,int __user * optlen)7116 static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
7117 char __user *optval, int __user *optlen)
7118 {
7119 struct sctp_sock *sp = sctp_sk(sk);
7120 struct sctp_association *asoc;
7121 struct sctp_assoc_ids *ids;
7122 size_t ids_size;
7123 u32 num = 0;
7124
7125 if (sctp_style(sk, TCP))
7126 return -EOPNOTSUPP;
7127
7128 if (len < sizeof(struct sctp_assoc_ids))
7129 return -EINVAL;
7130
7131 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7132 num++;
7133 }
7134
7135 ids_size = struct_size(ids, gaids_assoc_id, num);
7136 if (len < ids_size)
7137 return -EINVAL;
7138
7139 len = ids_size;
7140 ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
7141 if (unlikely(!ids))
7142 return -ENOMEM;
7143
7144 ids->gaids_number_of_ids = num;
7145 num = 0;
7146 list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
7147 ids->gaids_assoc_id[num++] = asoc->assoc_id;
7148 }
7149
7150 if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
7151 kfree(ids);
7152 return -EFAULT;
7153 }
7154
7155 kfree(ids);
7156 return 0;
7157 }
7158
7159 /*
7160 * SCTP_PEER_ADDR_THLDS
7161 *
7162 * This option allows us to fetch the partially failed threshold for one or all
7163 * transports in an association. See Section 6.1 of:
7164 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
7165 */
sctp_getsockopt_paddr_thresholds(struct sock * sk,char __user * optval,int len,int __user * optlen,bool v2)7166 static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
7167 char __user *optval, int len,
7168 int __user *optlen, bool v2)
7169 {
7170 struct sctp_paddrthlds_v2 val;
7171 struct sctp_transport *trans;
7172 struct sctp_association *asoc;
7173 int min;
7174
7175 min = v2 ? sizeof(val) : sizeof(struct sctp_paddrthlds);
7176 if (len < min)
7177 return -EINVAL;
7178 len = min;
7179 if (copy_from_user(&val, optval, len))
7180 return -EFAULT;
7181
7182 if (!sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
7183 trans = sctp_addr_id2transport(sk, &val.spt_address,
7184 val.spt_assoc_id);
7185 if (!trans)
7186 return -ENOENT;
7187
7188 val.spt_pathmaxrxt = trans->pathmaxrxt;
7189 val.spt_pathpfthld = trans->pf_retrans;
7190 val.spt_pathcpthld = trans->ps_retrans;
7191
7192 goto out;
7193 }
7194
7195 asoc = sctp_id2assoc(sk, val.spt_assoc_id);
7196 if (!asoc && val.spt_assoc_id != SCTP_FUTURE_ASSOC &&
7197 sctp_style(sk, UDP))
7198 return -EINVAL;
7199
7200 if (asoc) {
7201 val.spt_pathpfthld = asoc->pf_retrans;
7202 val.spt_pathmaxrxt = asoc->pathmaxrxt;
7203 val.spt_pathcpthld = asoc->ps_retrans;
7204 } else {
7205 struct sctp_sock *sp = sctp_sk(sk);
7206
7207 val.spt_pathpfthld = sp->pf_retrans;
7208 val.spt_pathmaxrxt = sp->pathmaxrxt;
7209 val.spt_pathcpthld = sp->ps_retrans;
7210 }
7211
7212 out:
7213 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
7214 return -EFAULT;
7215
7216 return 0;
7217 }
7218
7219 /*
7220 * SCTP_GET_ASSOC_STATS
7221 *
7222 * This option retrieves local per endpoint statistics. It is modeled
7223 * after OpenSolaris' implementation
7224 */
sctp_getsockopt_assoc_stats(struct sock * sk,int len,char __user * optval,int __user * optlen)7225 static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
7226 char __user *optval,
7227 int __user *optlen)
7228 {
7229 struct sctp_assoc_stats sas;
7230 struct sctp_association *asoc = NULL;
7231
7232 /* User must provide at least the assoc id */
7233 if (len < sizeof(sctp_assoc_t))
7234 return -EINVAL;
7235
7236 /* Allow the struct to grow and fill in as much as possible */
7237 len = min_t(size_t, len, sizeof(sas));
7238
7239 if (copy_from_user(&sas, optval, len))
7240 return -EFAULT;
7241
7242 asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
7243 if (!asoc)
7244 return -EINVAL;
7245
7246 sas.sas_rtxchunks = asoc->stats.rtxchunks;
7247 sas.sas_gapcnt = asoc->stats.gapcnt;
7248 sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
7249 sas.sas_osacks = asoc->stats.osacks;
7250 sas.sas_isacks = asoc->stats.isacks;
7251 sas.sas_octrlchunks = asoc->stats.octrlchunks;
7252 sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
7253 sas.sas_oodchunks = asoc->stats.oodchunks;
7254 sas.sas_iodchunks = asoc->stats.iodchunks;
7255 sas.sas_ouodchunks = asoc->stats.ouodchunks;
7256 sas.sas_iuodchunks = asoc->stats.iuodchunks;
7257 sas.sas_idupchunks = asoc->stats.idupchunks;
7258 sas.sas_opackets = asoc->stats.opackets;
7259 sas.sas_ipackets = asoc->stats.ipackets;
7260
7261 /* New high max rto observed, will return 0 if not a single
7262 * RTO update took place. obs_rto_ipaddr will be bogus
7263 * in such a case
7264 */
7265 sas.sas_maxrto = asoc->stats.max_obs_rto;
7266 memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
7267 sizeof(struct sockaddr_storage));
7268
7269 /* Mark beginning of a new observation period */
7270 asoc->stats.max_obs_rto = asoc->rto_min;
7271
7272 if (put_user(len, optlen))
7273 return -EFAULT;
7274
7275 pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
7276
7277 if (copy_to_user(optval, &sas, len))
7278 return -EFAULT;
7279
7280 return 0;
7281 }
7282
sctp_getsockopt_recvrcvinfo(struct sock * sk,int len,char __user * optval,int __user * optlen)7283 static int sctp_getsockopt_recvrcvinfo(struct sock *sk, int len,
7284 char __user *optval,
7285 int __user *optlen)
7286 {
7287 int val = 0;
7288
7289 if (len < sizeof(int))
7290 return -EINVAL;
7291
7292 len = sizeof(int);
7293 if (sctp_sk(sk)->recvrcvinfo)
7294 val = 1;
7295 if (put_user(len, optlen))
7296 return -EFAULT;
7297 if (copy_to_user(optval, &val, len))
7298 return -EFAULT;
7299
7300 return 0;
7301 }
7302
sctp_getsockopt_recvnxtinfo(struct sock * sk,int len,char __user * optval,int __user * optlen)7303 static int sctp_getsockopt_recvnxtinfo(struct sock *sk, int len,
7304 char __user *optval,
7305 int __user *optlen)
7306 {
7307 int val = 0;
7308
7309 if (len < sizeof(int))
7310 return -EINVAL;
7311
7312 len = sizeof(int);
7313 if (sctp_sk(sk)->recvnxtinfo)
7314 val = 1;
7315 if (put_user(len, optlen))
7316 return -EFAULT;
7317 if (copy_to_user(optval, &val, len))
7318 return -EFAULT;
7319
7320 return 0;
7321 }
7322
sctp_getsockopt_pr_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7323 static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
7324 char __user *optval,
7325 int __user *optlen)
7326 {
7327 struct sctp_assoc_value params;
7328 struct sctp_association *asoc;
7329 int retval = -EFAULT;
7330
7331 if (len < sizeof(params)) {
7332 retval = -EINVAL;
7333 goto out;
7334 }
7335
7336 len = sizeof(params);
7337 if (copy_from_user(¶ms, optval, len))
7338 goto out;
7339
7340 asoc = sctp_id2assoc(sk, params.assoc_id);
7341 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7342 sctp_style(sk, UDP)) {
7343 retval = -EINVAL;
7344 goto out;
7345 }
7346
7347 params.assoc_value = asoc ? asoc->peer.prsctp_capable
7348 : sctp_sk(sk)->ep->prsctp_enable;
7349
7350 if (put_user(len, optlen))
7351 goto out;
7352
7353 if (copy_to_user(optval, ¶ms, len))
7354 goto out;
7355
7356 retval = 0;
7357
7358 out:
7359 return retval;
7360 }
7361
sctp_getsockopt_default_prinfo(struct sock * sk,int len,char __user * optval,int __user * optlen)7362 static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
7363 char __user *optval,
7364 int __user *optlen)
7365 {
7366 struct sctp_default_prinfo info;
7367 struct sctp_association *asoc;
7368 int retval = -EFAULT;
7369
7370 if (len < sizeof(info)) {
7371 retval = -EINVAL;
7372 goto out;
7373 }
7374
7375 len = sizeof(info);
7376 if (copy_from_user(&info, optval, len))
7377 goto out;
7378
7379 asoc = sctp_id2assoc(sk, info.pr_assoc_id);
7380 if (!asoc && info.pr_assoc_id != SCTP_FUTURE_ASSOC &&
7381 sctp_style(sk, UDP)) {
7382 retval = -EINVAL;
7383 goto out;
7384 }
7385
7386 if (asoc) {
7387 info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
7388 info.pr_value = asoc->default_timetolive;
7389 } else {
7390 struct sctp_sock *sp = sctp_sk(sk);
7391
7392 info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
7393 info.pr_value = sp->default_timetolive;
7394 }
7395
7396 if (put_user(len, optlen))
7397 goto out;
7398
7399 if (copy_to_user(optval, &info, len))
7400 goto out;
7401
7402 retval = 0;
7403
7404 out:
7405 return retval;
7406 }
7407
sctp_getsockopt_pr_assocstatus(struct sock * sk,int len,char __user * optval,int __user * optlen)7408 static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
7409 char __user *optval,
7410 int __user *optlen)
7411 {
7412 struct sctp_prstatus params;
7413 struct sctp_association *asoc;
7414 int policy;
7415 int retval = -EINVAL;
7416
7417 if (len < sizeof(params))
7418 goto out;
7419
7420 len = sizeof(params);
7421 if (copy_from_user(¶ms, optval, len)) {
7422 retval = -EFAULT;
7423 goto out;
7424 }
7425
7426 policy = params.sprstat_policy;
7427 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7428 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7429 goto out;
7430
7431 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7432 if (!asoc)
7433 goto out;
7434
7435 if (policy == SCTP_PR_SCTP_ALL) {
7436 params.sprstat_abandoned_unsent = 0;
7437 params.sprstat_abandoned_sent = 0;
7438 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7439 params.sprstat_abandoned_unsent +=
7440 asoc->abandoned_unsent[policy];
7441 params.sprstat_abandoned_sent +=
7442 asoc->abandoned_sent[policy];
7443 }
7444 } else {
7445 params.sprstat_abandoned_unsent =
7446 asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7447 params.sprstat_abandoned_sent =
7448 asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
7449 }
7450
7451 if (put_user(len, optlen)) {
7452 retval = -EFAULT;
7453 goto out;
7454 }
7455
7456 if (copy_to_user(optval, ¶ms, len)) {
7457 retval = -EFAULT;
7458 goto out;
7459 }
7460
7461 retval = 0;
7462
7463 out:
7464 return retval;
7465 }
7466
sctp_getsockopt_pr_streamstatus(struct sock * sk,int len,char __user * optval,int __user * optlen)7467 static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
7468 char __user *optval,
7469 int __user *optlen)
7470 {
7471 struct sctp_stream_out_ext *streamoute;
7472 struct sctp_association *asoc;
7473 struct sctp_prstatus params;
7474 int retval = -EINVAL;
7475 int policy;
7476
7477 if (len < sizeof(params))
7478 goto out;
7479
7480 len = sizeof(params);
7481 if (copy_from_user(¶ms, optval, len)) {
7482 retval = -EFAULT;
7483 goto out;
7484 }
7485
7486 policy = params.sprstat_policy;
7487 if (!policy || (policy & ~(SCTP_PR_SCTP_MASK | SCTP_PR_SCTP_ALL)) ||
7488 ((policy & SCTP_PR_SCTP_ALL) && (policy & SCTP_PR_SCTP_MASK)))
7489 goto out;
7490
7491 asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
7492 if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
7493 goto out;
7494
7495 streamoute = SCTP_SO(&asoc->stream, params.sprstat_sid)->ext;
7496 if (!streamoute) {
7497 /* Not allocated yet, means all stats are 0 */
7498 params.sprstat_abandoned_unsent = 0;
7499 params.sprstat_abandoned_sent = 0;
7500 retval = 0;
7501 goto out;
7502 }
7503
7504 if (policy == SCTP_PR_SCTP_ALL) {
7505 params.sprstat_abandoned_unsent = 0;
7506 params.sprstat_abandoned_sent = 0;
7507 for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
7508 params.sprstat_abandoned_unsent +=
7509 streamoute->abandoned_unsent[policy];
7510 params.sprstat_abandoned_sent +=
7511 streamoute->abandoned_sent[policy];
7512 }
7513 } else {
7514 params.sprstat_abandoned_unsent =
7515 streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
7516 params.sprstat_abandoned_sent =
7517 streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
7518 }
7519
7520 if (put_user(len, optlen) || copy_to_user(optval, ¶ms, len)) {
7521 retval = -EFAULT;
7522 goto out;
7523 }
7524
7525 retval = 0;
7526
7527 out:
7528 return retval;
7529 }
7530
sctp_getsockopt_reconfig_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7531 static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
7532 char __user *optval,
7533 int __user *optlen)
7534 {
7535 struct sctp_assoc_value params;
7536 struct sctp_association *asoc;
7537 int retval = -EFAULT;
7538
7539 if (len < sizeof(params)) {
7540 retval = -EINVAL;
7541 goto out;
7542 }
7543
7544 len = sizeof(params);
7545 if (copy_from_user(¶ms, optval, len))
7546 goto out;
7547
7548 asoc = sctp_id2assoc(sk, params.assoc_id);
7549 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7550 sctp_style(sk, UDP)) {
7551 retval = -EINVAL;
7552 goto out;
7553 }
7554
7555 params.assoc_value = asoc ? asoc->peer.reconf_capable
7556 : sctp_sk(sk)->ep->reconf_enable;
7557
7558 if (put_user(len, optlen))
7559 goto out;
7560
7561 if (copy_to_user(optval, ¶ms, len))
7562 goto out;
7563
7564 retval = 0;
7565
7566 out:
7567 return retval;
7568 }
7569
sctp_getsockopt_enable_strreset(struct sock * sk,int len,char __user * optval,int __user * optlen)7570 static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
7571 char __user *optval,
7572 int __user *optlen)
7573 {
7574 struct sctp_assoc_value params;
7575 struct sctp_association *asoc;
7576 int retval = -EFAULT;
7577
7578 if (len < sizeof(params)) {
7579 retval = -EINVAL;
7580 goto out;
7581 }
7582
7583 len = sizeof(params);
7584 if (copy_from_user(¶ms, optval, len))
7585 goto out;
7586
7587 asoc = sctp_id2assoc(sk, params.assoc_id);
7588 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7589 sctp_style(sk, UDP)) {
7590 retval = -EINVAL;
7591 goto out;
7592 }
7593
7594 params.assoc_value = asoc ? asoc->strreset_enable
7595 : sctp_sk(sk)->ep->strreset_enable;
7596
7597 if (put_user(len, optlen))
7598 goto out;
7599
7600 if (copy_to_user(optval, ¶ms, len))
7601 goto out;
7602
7603 retval = 0;
7604
7605 out:
7606 return retval;
7607 }
7608
sctp_getsockopt_scheduler(struct sock * sk,int len,char __user * optval,int __user * optlen)7609 static int sctp_getsockopt_scheduler(struct sock *sk, int len,
7610 char __user *optval,
7611 int __user *optlen)
7612 {
7613 struct sctp_assoc_value params;
7614 struct sctp_association *asoc;
7615 int retval = -EFAULT;
7616
7617 if (len < sizeof(params)) {
7618 retval = -EINVAL;
7619 goto out;
7620 }
7621
7622 len = sizeof(params);
7623 if (copy_from_user(¶ms, optval, len))
7624 goto out;
7625
7626 asoc = sctp_id2assoc(sk, params.assoc_id);
7627 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7628 sctp_style(sk, UDP)) {
7629 retval = -EINVAL;
7630 goto out;
7631 }
7632
7633 params.assoc_value = asoc ? sctp_sched_get_sched(asoc)
7634 : sctp_sk(sk)->default_ss;
7635
7636 if (put_user(len, optlen))
7637 goto out;
7638
7639 if (copy_to_user(optval, ¶ms, len))
7640 goto out;
7641
7642 retval = 0;
7643
7644 out:
7645 return retval;
7646 }
7647
sctp_getsockopt_scheduler_value(struct sock * sk,int len,char __user * optval,int __user * optlen)7648 static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
7649 char __user *optval,
7650 int __user *optlen)
7651 {
7652 struct sctp_stream_value params;
7653 struct sctp_association *asoc;
7654 int retval = -EFAULT;
7655
7656 if (len < sizeof(params)) {
7657 retval = -EINVAL;
7658 goto out;
7659 }
7660
7661 len = sizeof(params);
7662 if (copy_from_user(¶ms, optval, len))
7663 goto out;
7664
7665 asoc = sctp_id2assoc(sk, params.assoc_id);
7666 if (!asoc) {
7667 retval = -EINVAL;
7668 goto out;
7669 }
7670
7671 retval = sctp_sched_get_value(asoc, params.stream_id,
7672 ¶ms.stream_value);
7673 if (retval)
7674 goto out;
7675
7676 if (put_user(len, optlen)) {
7677 retval = -EFAULT;
7678 goto out;
7679 }
7680
7681 if (copy_to_user(optval, ¶ms, len)) {
7682 retval = -EFAULT;
7683 goto out;
7684 }
7685
7686 out:
7687 return retval;
7688 }
7689
sctp_getsockopt_interleaving_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7690 static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
7691 char __user *optval,
7692 int __user *optlen)
7693 {
7694 struct sctp_assoc_value params;
7695 struct sctp_association *asoc;
7696 int retval = -EFAULT;
7697
7698 if (len < sizeof(params)) {
7699 retval = -EINVAL;
7700 goto out;
7701 }
7702
7703 len = sizeof(params);
7704 if (copy_from_user(¶ms, optval, len))
7705 goto out;
7706
7707 asoc = sctp_id2assoc(sk, params.assoc_id);
7708 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7709 sctp_style(sk, UDP)) {
7710 retval = -EINVAL;
7711 goto out;
7712 }
7713
7714 params.assoc_value = asoc ? asoc->peer.intl_capable
7715 : sctp_sk(sk)->ep->intl_enable;
7716
7717 if (put_user(len, optlen))
7718 goto out;
7719
7720 if (copy_to_user(optval, ¶ms, len))
7721 goto out;
7722
7723 retval = 0;
7724
7725 out:
7726 return retval;
7727 }
7728
sctp_getsockopt_reuse_port(struct sock * sk,int len,char __user * optval,int __user * optlen)7729 static int sctp_getsockopt_reuse_port(struct sock *sk, int len,
7730 char __user *optval,
7731 int __user *optlen)
7732 {
7733 int val;
7734
7735 if (len < sizeof(int))
7736 return -EINVAL;
7737
7738 len = sizeof(int);
7739 val = sctp_sk(sk)->reuse;
7740 if (put_user(len, optlen))
7741 return -EFAULT;
7742
7743 if (copy_to_user(optval, &val, len))
7744 return -EFAULT;
7745
7746 return 0;
7747 }
7748
sctp_getsockopt_event(struct sock * sk,int len,char __user * optval,int __user * optlen)7749 static int sctp_getsockopt_event(struct sock *sk, int len, char __user *optval,
7750 int __user *optlen)
7751 {
7752 struct sctp_association *asoc;
7753 struct sctp_event param;
7754 __u16 subscribe;
7755
7756 if (len < sizeof(param))
7757 return -EINVAL;
7758
7759 len = sizeof(param);
7760 if (copy_from_user(¶m, optval, len))
7761 return -EFAULT;
7762
7763 if (param.se_type < SCTP_SN_TYPE_BASE ||
7764 param.se_type > SCTP_SN_TYPE_MAX)
7765 return -EINVAL;
7766
7767 asoc = sctp_id2assoc(sk, param.se_assoc_id);
7768 if (!asoc && param.se_assoc_id != SCTP_FUTURE_ASSOC &&
7769 sctp_style(sk, UDP))
7770 return -EINVAL;
7771
7772 subscribe = asoc ? asoc->subscribe : sctp_sk(sk)->subscribe;
7773 param.se_on = sctp_ulpevent_type_enabled(subscribe, param.se_type);
7774
7775 if (put_user(len, optlen))
7776 return -EFAULT;
7777
7778 if (copy_to_user(optval, ¶m, len))
7779 return -EFAULT;
7780
7781 return 0;
7782 }
7783
sctp_getsockopt_asconf_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7784 static int sctp_getsockopt_asconf_supported(struct sock *sk, int len,
7785 char __user *optval,
7786 int __user *optlen)
7787 {
7788 struct sctp_assoc_value params;
7789 struct sctp_association *asoc;
7790 int retval = -EFAULT;
7791
7792 if (len < sizeof(params)) {
7793 retval = -EINVAL;
7794 goto out;
7795 }
7796
7797 len = sizeof(params);
7798 if (copy_from_user(¶ms, optval, len))
7799 goto out;
7800
7801 asoc = sctp_id2assoc(sk, params.assoc_id);
7802 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7803 sctp_style(sk, UDP)) {
7804 retval = -EINVAL;
7805 goto out;
7806 }
7807
7808 params.assoc_value = asoc ? asoc->peer.asconf_capable
7809 : sctp_sk(sk)->ep->asconf_enable;
7810
7811 if (put_user(len, optlen))
7812 goto out;
7813
7814 if (copy_to_user(optval, ¶ms, len))
7815 goto out;
7816
7817 retval = 0;
7818
7819 out:
7820 return retval;
7821 }
7822
sctp_getsockopt_auth_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7823 static int sctp_getsockopt_auth_supported(struct sock *sk, int len,
7824 char __user *optval,
7825 int __user *optlen)
7826 {
7827 struct sctp_assoc_value params;
7828 struct sctp_association *asoc;
7829 int retval = -EFAULT;
7830
7831 if (len < sizeof(params)) {
7832 retval = -EINVAL;
7833 goto out;
7834 }
7835
7836 len = sizeof(params);
7837 if (copy_from_user(¶ms, optval, len))
7838 goto out;
7839
7840 asoc = sctp_id2assoc(sk, params.assoc_id);
7841 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7842 sctp_style(sk, UDP)) {
7843 retval = -EINVAL;
7844 goto out;
7845 }
7846
7847 params.assoc_value = asoc ? asoc->peer.auth_capable
7848 : sctp_sk(sk)->ep->auth_enable;
7849
7850 if (put_user(len, optlen))
7851 goto out;
7852
7853 if (copy_to_user(optval, ¶ms, len))
7854 goto out;
7855
7856 retval = 0;
7857
7858 out:
7859 return retval;
7860 }
7861
sctp_getsockopt_ecn_supported(struct sock * sk,int len,char __user * optval,int __user * optlen)7862 static int sctp_getsockopt_ecn_supported(struct sock *sk, int len,
7863 char __user *optval,
7864 int __user *optlen)
7865 {
7866 struct sctp_assoc_value params;
7867 struct sctp_association *asoc;
7868 int retval = -EFAULT;
7869
7870 if (len < sizeof(params)) {
7871 retval = -EINVAL;
7872 goto out;
7873 }
7874
7875 len = sizeof(params);
7876 if (copy_from_user(¶ms, optval, len))
7877 goto out;
7878
7879 asoc = sctp_id2assoc(sk, params.assoc_id);
7880 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7881 sctp_style(sk, UDP)) {
7882 retval = -EINVAL;
7883 goto out;
7884 }
7885
7886 params.assoc_value = asoc ? asoc->peer.ecn_capable
7887 : sctp_sk(sk)->ep->ecn_enable;
7888
7889 if (put_user(len, optlen))
7890 goto out;
7891
7892 if (copy_to_user(optval, ¶ms, len))
7893 goto out;
7894
7895 retval = 0;
7896
7897 out:
7898 return retval;
7899 }
7900
sctp_getsockopt_pf_expose(struct sock * sk,int len,char __user * optval,int __user * optlen)7901 static int sctp_getsockopt_pf_expose(struct sock *sk, int len,
7902 char __user *optval,
7903 int __user *optlen)
7904 {
7905 struct sctp_assoc_value params;
7906 struct sctp_association *asoc;
7907 int retval = -EFAULT;
7908
7909 if (len < sizeof(params)) {
7910 retval = -EINVAL;
7911 goto out;
7912 }
7913
7914 len = sizeof(params);
7915 if (copy_from_user(¶ms, optval, len))
7916 goto out;
7917
7918 asoc = sctp_id2assoc(sk, params.assoc_id);
7919 if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
7920 sctp_style(sk, UDP)) {
7921 retval = -EINVAL;
7922 goto out;
7923 }
7924
7925 params.assoc_value = asoc ? asoc->pf_expose
7926 : sctp_sk(sk)->pf_expose;
7927
7928 if (put_user(len, optlen))
7929 goto out;
7930
7931 if (copy_to_user(optval, ¶ms, len))
7932 goto out;
7933
7934 retval = 0;
7935
7936 out:
7937 return retval;
7938 }
7939
sctp_getsockopt_encap_port(struct sock * sk,int len,char __user * optval,int __user * optlen)7940 static int sctp_getsockopt_encap_port(struct sock *sk, int len,
7941 char __user *optval, int __user *optlen)
7942 {
7943 struct sctp_association *asoc;
7944 struct sctp_udpencaps encap;
7945 struct sctp_transport *t;
7946 __be16 encap_port;
7947
7948 if (len < sizeof(encap))
7949 return -EINVAL;
7950
7951 len = sizeof(encap);
7952 if (copy_from_user(&encap, optval, len))
7953 return -EFAULT;
7954
7955 /* If an address other than INADDR_ANY is specified, and
7956 * no transport is found, then the request is invalid.
7957 */
7958 if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
7959 t = sctp_addr_id2transport(sk, &encap.sue_address,
7960 encap.sue_assoc_id);
7961 if (!t) {
7962 pr_debug("%s: failed no transport\n", __func__);
7963 return -EINVAL;
7964 }
7965
7966 encap_port = t->encap_port;
7967 goto out;
7968 }
7969
7970 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
7971 * socket is a one to many style socket, and an association
7972 * was not found, then the id was invalid.
7973 */
7974 asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
7975 if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
7976 sctp_style(sk, UDP)) {
7977 pr_debug("%s: failed no association\n", __func__);
7978 return -EINVAL;
7979 }
7980
7981 if (asoc) {
7982 encap_port = asoc->encap_port;
7983 goto out;
7984 }
7985
7986 encap_port = sctp_sk(sk)->encap_port;
7987
7988 out:
7989 encap.sue_port = (__force uint16_t)encap_port;
7990 if (copy_to_user(optval, &encap, len))
7991 return -EFAULT;
7992
7993 if (put_user(len, optlen))
7994 return -EFAULT;
7995
7996 return 0;
7997 }
7998
sctp_getsockopt_probe_interval(struct sock * sk,int len,char __user * optval,int __user * optlen)7999 static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
8000 char __user *optval,
8001 int __user *optlen)
8002 {
8003 struct sctp_probeinterval params;
8004 struct sctp_association *asoc;
8005 struct sctp_transport *t;
8006 __u32 probe_interval;
8007
8008 if (len < sizeof(params))
8009 return -EINVAL;
8010
8011 len = sizeof(params);
8012 if (copy_from_user(¶ms, optval, len))
8013 return -EFAULT;
8014
8015 /* If an address other than INADDR_ANY is specified, and
8016 * no transport is found, then the request is invalid.
8017 */
8018 if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spi_address)) {
8019 t = sctp_addr_id2transport(sk, ¶ms.spi_address,
8020 params.spi_assoc_id);
8021 if (!t) {
8022 pr_debug("%s: failed no transport\n", __func__);
8023 return -EINVAL;
8024 }
8025
8026 probe_interval = jiffies_to_msecs(t->probe_interval);
8027 goto out;
8028 }
8029
8030 /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
8031 * socket is a one to many style socket, and an association
8032 * was not found, then the id was invalid.
8033 */
8034 asoc = sctp_id2assoc(sk, params.spi_assoc_id);
8035 if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
8036 sctp_style(sk, UDP)) {
8037 pr_debug("%s: failed no association\n", __func__);
8038 return -EINVAL;
8039 }
8040
8041 if (asoc) {
8042 probe_interval = jiffies_to_msecs(asoc->probe_interval);
8043 goto out;
8044 }
8045
8046 probe_interval = sctp_sk(sk)->probe_interval;
8047
8048 out:
8049 params.spi_interval = probe_interval;
8050 if (copy_to_user(optval, ¶ms, len))
8051 return -EFAULT;
8052
8053 if (put_user(len, optlen))
8054 return -EFAULT;
8055
8056 return 0;
8057 }
8058
sctp_getsockopt(struct sock * sk,int level,int optname,char __user * optval,int __user * optlen)8059 static int sctp_getsockopt(struct sock *sk, int level, int optname,
8060 char __user *optval, int __user *optlen)
8061 {
8062 int retval = 0;
8063 int len;
8064
8065 pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
8066
8067 /* I can hardly begin to describe how wrong this is. This is
8068 * so broken as to be worse than useless. The API draft
8069 * REALLY is NOT helpful here... I am not convinced that the
8070 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
8071 * are at all well-founded.
8072 */
8073 if (level != SOL_SCTP) {
8074 struct sctp_af *af = sctp_sk(sk)->pf->af;
8075
8076 retval = af->getsockopt(sk, level, optname, optval, optlen);
8077 return retval;
8078 }
8079
8080 if (get_user(len, optlen))
8081 return -EFAULT;
8082
8083 if (len < 0)
8084 return -EINVAL;
8085
8086 lock_sock(sk);
8087
8088 switch (optname) {
8089 case SCTP_STATUS:
8090 retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
8091 break;
8092 case SCTP_DISABLE_FRAGMENTS:
8093 retval = sctp_getsockopt_disable_fragments(sk, len, optval,
8094 optlen);
8095 break;
8096 case SCTP_EVENTS:
8097 retval = sctp_getsockopt_events(sk, len, optval, optlen);
8098 break;
8099 case SCTP_AUTOCLOSE:
8100 retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
8101 break;
8102 case SCTP_SOCKOPT_PEELOFF:
8103 retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
8104 break;
8105 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8106 retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
8107 break;
8108 case SCTP_PEER_ADDR_PARAMS:
8109 retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
8110 optlen);
8111 break;
8112 case SCTP_DELAYED_SACK:
8113 retval = sctp_getsockopt_delayed_ack(sk, len, optval,
8114 optlen);
8115 break;
8116 case SCTP_INITMSG:
8117 retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
8118 break;
8119 case SCTP_GET_PEER_ADDRS:
8120 retval = sctp_getsockopt_peer_addrs(sk, len, optval,
8121 optlen);
8122 break;
8123 case SCTP_GET_LOCAL_ADDRS:
8124 retval = sctp_getsockopt_local_addrs(sk, len, optval,
8125 optlen);
8126 break;
8127 case SCTP_SOCKOPT_CONNECTX3:
8128 retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
8129 break;
8130 case SCTP_DEFAULT_SEND_PARAM:
8131 retval = sctp_getsockopt_default_send_param(sk, len,
8132 optval, optlen);
8133 break;
8134 case SCTP_DEFAULT_SNDINFO:
8135 retval = sctp_getsockopt_default_sndinfo(sk, len,
8136 optval, optlen);
8137 break;
8138 case SCTP_PRIMARY_ADDR:
8139 retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
8140 break;
8141 case SCTP_NODELAY:
8142 retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
8143 break;
8144 case SCTP_RTOINFO:
8145 retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
8146 break;
8147 case SCTP_ASSOCINFO:
8148 retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
8149 break;
8150 case SCTP_I_WANT_MAPPED_V4_ADDR:
8151 retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
8152 break;
8153 case SCTP_MAXSEG:
8154 retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
8155 break;
8156 case SCTP_GET_PEER_ADDR_INFO:
8157 retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
8158 optlen);
8159 break;
8160 case SCTP_ADAPTATION_LAYER:
8161 retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
8162 optlen);
8163 break;
8164 case SCTP_CONTEXT:
8165 retval = sctp_getsockopt_context(sk, len, optval, optlen);
8166 break;
8167 case SCTP_FRAGMENT_INTERLEAVE:
8168 retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
8169 optlen);
8170 break;
8171 case SCTP_PARTIAL_DELIVERY_POINT:
8172 retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
8173 optlen);
8174 break;
8175 case SCTP_MAX_BURST:
8176 retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
8177 break;
8178 case SCTP_AUTH_KEY:
8179 case SCTP_AUTH_CHUNK:
8180 case SCTP_AUTH_DELETE_KEY:
8181 case SCTP_AUTH_DEACTIVATE_KEY:
8182 retval = -EOPNOTSUPP;
8183 break;
8184 case SCTP_HMAC_IDENT:
8185 retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
8186 break;
8187 case SCTP_AUTH_ACTIVE_KEY:
8188 retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
8189 break;
8190 case SCTP_PEER_AUTH_CHUNKS:
8191 retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
8192 optlen);
8193 break;
8194 case SCTP_LOCAL_AUTH_CHUNKS:
8195 retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
8196 optlen);
8197 break;
8198 case SCTP_GET_ASSOC_NUMBER:
8199 retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
8200 break;
8201 case SCTP_GET_ASSOC_ID_LIST:
8202 retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
8203 break;
8204 case SCTP_AUTO_ASCONF:
8205 retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
8206 break;
8207 case SCTP_PEER_ADDR_THLDS:
8208 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8209 optlen, false);
8210 break;
8211 case SCTP_PEER_ADDR_THLDS_V2:
8212 retval = sctp_getsockopt_paddr_thresholds(sk, optval, len,
8213 optlen, true);
8214 break;
8215 case SCTP_GET_ASSOC_STATS:
8216 retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
8217 break;
8218 case SCTP_RECVRCVINFO:
8219 retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
8220 break;
8221 case SCTP_RECVNXTINFO:
8222 retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
8223 break;
8224 case SCTP_PR_SUPPORTED:
8225 retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
8226 break;
8227 case SCTP_DEFAULT_PRINFO:
8228 retval = sctp_getsockopt_default_prinfo(sk, len, optval,
8229 optlen);
8230 break;
8231 case SCTP_PR_ASSOC_STATUS:
8232 retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
8233 optlen);
8234 break;
8235 case SCTP_PR_STREAM_STATUS:
8236 retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
8237 optlen);
8238 break;
8239 case SCTP_RECONFIG_SUPPORTED:
8240 retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
8241 optlen);
8242 break;
8243 case SCTP_ENABLE_STREAM_RESET:
8244 retval = sctp_getsockopt_enable_strreset(sk, len, optval,
8245 optlen);
8246 break;
8247 case SCTP_STREAM_SCHEDULER:
8248 retval = sctp_getsockopt_scheduler(sk, len, optval,
8249 optlen);
8250 break;
8251 case SCTP_STREAM_SCHEDULER_VALUE:
8252 retval = sctp_getsockopt_scheduler_value(sk, len, optval,
8253 optlen);
8254 break;
8255 case SCTP_INTERLEAVING_SUPPORTED:
8256 retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
8257 optlen);
8258 break;
8259 case SCTP_REUSE_PORT:
8260 retval = sctp_getsockopt_reuse_port(sk, len, optval, optlen);
8261 break;
8262 case SCTP_EVENT:
8263 retval = sctp_getsockopt_event(sk, len, optval, optlen);
8264 break;
8265 case SCTP_ASCONF_SUPPORTED:
8266 retval = sctp_getsockopt_asconf_supported(sk, len, optval,
8267 optlen);
8268 break;
8269 case SCTP_AUTH_SUPPORTED:
8270 retval = sctp_getsockopt_auth_supported(sk, len, optval,
8271 optlen);
8272 break;
8273 case SCTP_ECN_SUPPORTED:
8274 retval = sctp_getsockopt_ecn_supported(sk, len, optval, optlen);
8275 break;
8276 case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
8277 retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
8278 break;
8279 case SCTP_REMOTE_UDP_ENCAPS_PORT:
8280 retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
8281 break;
8282 case SCTP_PLPMTUD_PROBE_INTERVAL:
8283 retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
8284 break;
8285 default:
8286 retval = -ENOPROTOOPT;
8287 break;
8288 }
8289
8290 release_sock(sk);
8291 return retval;
8292 }
8293
sctp_bpf_bypass_getsockopt(int level,int optname)8294 static bool sctp_bpf_bypass_getsockopt(int level, int optname)
8295 {
8296 if (level == SOL_SCTP) {
8297 switch (optname) {
8298 case SCTP_SOCKOPT_PEELOFF:
8299 case SCTP_SOCKOPT_PEELOFF_FLAGS:
8300 case SCTP_SOCKOPT_CONNECTX3:
8301 return true;
8302 default:
8303 return false;
8304 }
8305 }
8306
8307 return false;
8308 }
8309
sctp_hash(struct sock * sk)8310 static int sctp_hash(struct sock *sk)
8311 {
8312 /* STUB */
8313 return 0;
8314 }
8315
sctp_unhash(struct sock * sk)8316 static void sctp_unhash(struct sock *sk)
8317 {
8318 /* STUB */
8319 }
8320
8321 /* Check if port is acceptable. Possibly find first available port.
8322 *
8323 * The port hash table (contained in the 'global' SCTP protocol storage
8324 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
8325 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
8326 * list (the list number is the port number hashed out, so as you
8327 * would expect from a hash function, all the ports in a given list have
8328 * such a number that hashes out to the same list number; you were
8329 * expecting that, right?); so each list has a set of ports, with a
8330 * link to the socket (struct sock) that uses it, the port number and
8331 * a fastreuse flag (FIXME: NPI ipg).
8332 */
8333 static struct sctp_bind_bucket *sctp_bucket_create(
8334 struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
8335
sctp_get_port_local(struct sock * sk,union sctp_addr * addr)8336 static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
8337 {
8338 struct sctp_sock *sp = sctp_sk(sk);
8339 bool reuse = (sk->sk_reuse || sp->reuse);
8340 struct sctp_bind_hashbucket *head; /* hash list */
8341 struct net *net = sock_net(sk);
8342 kuid_t uid = sock_i_uid(sk);
8343 struct sctp_bind_bucket *pp;
8344 unsigned short snum;
8345 int ret;
8346
8347 snum = ntohs(addr->v4.sin_port);
8348
8349 pr_debug("%s: begins, snum:%d\n", __func__, snum);
8350
8351 if (snum == 0) {
8352 /* Search for an available port. */
8353 int low, high, remaining, index;
8354 unsigned int rover;
8355
8356 inet_sk_get_local_port_range(sk, &low, &high);
8357 remaining = (high - low) + 1;
8358 rover = get_random_u32_below(remaining) + low;
8359
8360 do {
8361 rover++;
8362 if ((rover < low) || (rover > high))
8363 rover = low;
8364 if (inet_is_local_reserved_port(net, rover))
8365 continue;
8366 index = sctp_phashfn(net, rover);
8367 head = &sctp_port_hashtable[index];
8368 spin_lock_bh(&head->lock);
8369 sctp_for_each_hentry(pp, &head->chain)
8370 if ((pp->port == rover) &&
8371 net_eq(net, pp->net))
8372 goto next;
8373 break;
8374 next:
8375 spin_unlock_bh(&head->lock);
8376 cond_resched();
8377 } while (--remaining > 0);
8378
8379 /* Exhausted local port range during search? */
8380 ret = 1;
8381 if (remaining <= 0)
8382 return ret;
8383
8384 /* OK, here is the one we will use. HEAD (the port
8385 * hash table list entry) is non-NULL and we hold it's
8386 * mutex.
8387 */
8388 snum = rover;
8389 } else {
8390 /* We are given an specific port number; we verify
8391 * that it is not being used. If it is used, we will
8392 * exahust the search in the hash list corresponding
8393 * to the port number (snum) - we detect that with the
8394 * port iterator, pp being NULL.
8395 */
8396 head = &sctp_port_hashtable[sctp_phashfn(net, snum)];
8397 spin_lock_bh(&head->lock);
8398 sctp_for_each_hentry(pp, &head->chain) {
8399 if ((pp->port == snum) && net_eq(pp->net, net))
8400 goto pp_found;
8401 }
8402 }
8403 pp = NULL;
8404 goto pp_not_found;
8405 pp_found:
8406 if (!hlist_empty(&pp->owner)) {
8407 /* We had a port hash table hit - there is an
8408 * available port (pp != NULL) and it is being
8409 * used by other socket (pp->owner not empty); that other
8410 * socket is going to be sk2.
8411 */
8412 struct sock *sk2;
8413
8414 pr_debug("%s: found a possible match\n", __func__);
8415
8416 if ((pp->fastreuse && reuse &&
8417 sk->sk_state != SCTP_SS_LISTENING) ||
8418 (pp->fastreuseport && sk->sk_reuseport &&
8419 uid_eq(pp->fastuid, uid)))
8420 goto success;
8421
8422 /* Run through the list of sockets bound to the port
8423 * (pp->port) [via the pointers bind_next and
8424 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
8425 * we get the endpoint they describe and run through
8426 * the endpoint's list of IP (v4 or v6) addresses,
8427 * comparing each of the addresses with the address of
8428 * the socket sk. If we find a match, then that means
8429 * that this port/socket (sk) combination are already
8430 * in an endpoint.
8431 */
8432 sk_for_each_bound(sk2, &pp->owner) {
8433 int bound_dev_if2 = READ_ONCE(sk2->sk_bound_dev_if);
8434 struct sctp_sock *sp2 = sctp_sk(sk2);
8435 struct sctp_endpoint *ep2 = sp2->ep;
8436
8437 if (sk == sk2 ||
8438 (reuse && (sk2->sk_reuse || sp2->reuse) &&
8439 sk2->sk_state != SCTP_SS_LISTENING) ||
8440 (sk->sk_reuseport && sk2->sk_reuseport &&
8441 uid_eq(uid, sock_i_uid(sk2))))
8442 continue;
8443
8444 if ((!sk->sk_bound_dev_if || !bound_dev_if2 ||
8445 sk->sk_bound_dev_if == bound_dev_if2) &&
8446 sctp_bind_addr_conflict(&ep2->base.bind_addr,
8447 addr, sp2, sp)) {
8448 ret = 1;
8449 goto fail_unlock;
8450 }
8451 }
8452
8453 pr_debug("%s: found a match\n", __func__);
8454 }
8455 pp_not_found:
8456 /* If there was a hash table miss, create a new port. */
8457 ret = 1;
8458 if (!pp && !(pp = sctp_bucket_create(head, net, snum)))
8459 goto fail_unlock;
8460
8461 /* In either case (hit or miss), make sure fastreuse is 1 only
8462 * if sk->sk_reuse is too (that is, if the caller requested
8463 * SO_REUSEADDR on this socket -sk-).
8464 */
8465 if (hlist_empty(&pp->owner)) {
8466 if (reuse && sk->sk_state != SCTP_SS_LISTENING)
8467 pp->fastreuse = 1;
8468 else
8469 pp->fastreuse = 0;
8470
8471 if (sk->sk_reuseport) {
8472 pp->fastreuseport = 1;
8473 pp->fastuid = uid;
8474 } else {
8475 pp->fastreuseport = 0;
8476 }
8477 } else {
8478 if (pp->fastreuse &&
8479 (!reuse || sk->sk_state == SCTP_SS_LISTENING))
8480 pp->fastreuse = 0;
8481
8482 if (pp->fastreuseport &&
8483 (!sk->sk_reuseport || !uid_eq(pp->fastuid, uid)))
8484 pp->fastreuseport = 0;
8485 }
8486
8487 /* We are set, so fill up all the data in the hash table
8488 * entry, tie the socket list information with the rest of the
8489 * sockets FIXME: Blurry, NPI (ipg).
8490 */
8491 success:
8492 if (!sp->bind_hash) {
8493 inet_sk(sk)->inet_num = snum;
8494 sk_add_bind_node(sk, &pp->owner);
8495 sp->bind_hash = pp;
8496 }
8497 ret = 0;
8498
8499 fail_unlock:
8500 spin_unlock_bh(&head->lock);
8501 return ret;
8502 }
8503
8504 /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral
8505 * port is requested.
8506 */
sctp_get_port(struct sock * sk,unsigned short snum)8507 static int sctp_get_port(struct sock *sk, unsigned short snum)
8508 {
8509 union sctp_addr addr;
8510 struct sctp_af *af = sctp_sk(sk)->pf->af;
8511
8512 /* Set up a dummy address struct from the sk. */
8513 af->from_sk(&addr, sk);
8514 addr.v4.sin_port = htons(snum);
8515
8516 /* Note: sk->sk_num gets filled in if ephemeral port request. */
8517 return sctp_get_port_local(sk, &addr);
8518 }
8519
8520 /*
8521 * Move a socket to LISTENING state.
8522 */
sctp_listen_start(struct sock * sk,int backlog)8523 static int sctp_listen_start(struct sock *sk, int backlog)
8524 {
8525 struct sctp_sock *sp = sctp_sk(sk);
8526 struct sctp_endpoint *ep = sp->ep;
8527 struct crypto_shash *tfm = NULL;
8528 char alg[32];
8529
8530 /* Allocate HMAC for generating cookie. */
8531 if (!sp->hmac && sp->sctp_hmac_alg) {
8532 sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
8533 tfm = crypto_alloc_shash(alg, 0, 0);
8534 if (IS_ERR(tfm)) {
8535 net_info_ratelimited("failed to load transform for %s: %ld\n",
8536 sp->sctp_hmac_alg, PTR_ERR(tfm));
8537 return -ENOSYS;
8538 }
8539 sctp_sk(sk)->hmac = tfm;
8540 }
8541
8542 /*
8543 * If a bind() or sctp_bindx() is not called prior to a listen()
8544 * call that allows new associations to be accepted, the system
8545 * picks an ephemeral port and will choose an address set equivalent
8546 * to binding with a wildcard address.
8547 *
8548 * This is not currently spelled out in the SCTP sockets
8549 * extensions draft, but follows the practice as seen in TCP
8550 * sockets.
8551 *
8552 */
8553 inet_sk_set_state(sk, SCTP_SS_LISTENING);
8554 if (!ep->base.bind_addr.port) {
8555 if (sctp_autobind(sk))
8556 return -EAGAIN;
8557 } else {
8558 if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
8559 inet_sk_set_state(sk, SCTP_SS_CLOSED);
8560 return -EADDRINUSE;
8561 }
8562 }
8563
8564 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8565 return sctp_hash_endpoint(ep);
8566 }
8567
8568 /*
8569 * 4.1.3 / 5.1.3 listen()
8570 *
8571 * By default, new associations are not accepted for UDP style sockets.
8572 * An application uses listen() to mark a socket as being able to
8573 * accept new associations.
8574 *
8575 * On TCP style sockets, applications use listen() to ready the SCTP
8576 * endpoint for accepting inbound associations.
8577 *
8578 * On both types of endpoints a backlog of '0' disables listening.
8579 *
8580 * Move a socket to LISTENING state.
8581 */
sctp_inet_listen(struct socket * sock,int backlog)8582 int sctp_inet_listen(struct socket *sock, int backlog)
8583 {
8584 struct sock *sk = sock->sk;
8585 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
8586 int err = -EINVAL;
8587
8588 if (unlikely(backlog < 0))
8589 return err;
8590
8591 lock_sock(sk);
8592
8593 /* Peeled-off sockets are not allowed to listen(). */
8594 if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
8595 goto out;
8596
8597 if (sock->state != SS_UNCONNECTED)
8598 goto out;
8599
8600 if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
8601 goto out;
8602
8603 /* If backlog is zero, disable listening. */
8604 if (!backlog) {
8605 if (sctp_sstate(sk, CLOSED))
8606 goto out;
8607
8608 err = 0;
8609 sctp_unhash_endpoint(ep);
8610 sk->sk_state = SCTP_SS_CLOSED;
8611 if (sk->sk_reuse || sctp_sk(sk)->reuse)
8612 sctp_sk(sk)->bind_hash->fastreuse = 1;
8613 goto out;
8614 }
8615
8616 /* If we are already listening, just update the backlog */
8617 if (sctp_sstate(sk, LISTENING))
8618 WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
8619 else {
8620 err = sctp_listen_start(sk, backlog);
8621 if (err)
8622 goto out;
8623 }
8624
8625 err = 0;
8626 out:
8627 release_sock(sk);
8628 return err;
8629 }
8630
8631 /*
8632 * This function is done by modeling the current datagram_poll() and the
8633 * tcp_poll(). Note that, based on these implementations, we don't
8634 * lock the socket in this function, even though it seems that,
8635 * ideally, locking or some other mechanisms can be used to ensure
8636 * the integrity of the counters (sndbuf and wmem_alloc) used
8637 * in this place. We assume that we don't need locks either until proven
8638 * otherwise.
8639 *
8640 * Another thing to note is that we include the Async I/O support
8641 * here, again, by modeling the current TCP/UDP code. We don't have
8642 * a good way to test with it yet.
8643 */
sctp_poll(struct file * file,struct socket * sock,poll_table * wait)8644 __poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
8645 {
8646 struct sock *sk = sock->sk;
8647 struct sctp_sock *sp = sctp_sk(sk);
8648 __poll_t mask;
8649
8650 poll_wait(file, sk_sleep(sk), wait);
8651
8652 sock_rps_record_flow(sk);
8653
8654 /* A TCP-style listening socket becomes readable when the accept queue
8655 * is not empty.
8656 */
8657 if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
8658 return (!list_empty(&sp->ep->asocs)) ?
8659 (EPOLLIN | EPOLLRDNORM) : 0;
8660
8661 mask = 0;
8662
8663 /* Is there any exceptional events? */
8664 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
8665 mask |= EPOLLERR |
8666 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
8667 if (sk->sk_shutdown & RCV_SHUTDOWN)
8668 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
8669 if (sk->sk_shutdown == SHUTDOWN_MASK)
8670 mask |= EPOLLHUP;
8671
8672 /* Is it readable? Reconsider this code with TCP-style support. */
8673 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
8674 mask |= EPOLLIN | EPOLLRDNORM;
8675
8676 /* The association is either gone or not ready. */
8677 if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
8678 return mask;
8679
8680 /* Is it writable? */
8681 if (sctp_writeable(sk)) {
8682 mask |= EPOLLOUT | EPOLLWRNORM;
8683 } else {
8684 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
8685 /*
8686 * Since the socket is not locked, the buffer
8687 * might be made available after the writeable check and
8688 * before the bit is set. This could cause a lost I/O
8689 * signal. tcp_poll() has a race breaker for this race
8690 * condition. Based on their implementation, we put
8691 * in the following code to cover it as well.
8692 */
8693 if (sctp_writeable(sk))
8694 mask |= EPOLLOUT | EPOLLWRNORM;
8695 }
8696 return mask;
8697 }
8698
8699 /********************************************************************
8700 * 2nd Level Abstractions
8701 ********************************************************************/
8702
sctp_bucket_create(struct sctp_bind_hashbucket * head,struct net * net,unsigned short snum)8703 static struct sctp_bind_bucket *sctp_bucket_create(
8704 struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
8705 {
8706 struct sctp_bind_bucket *pp;
8707
8708 pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
8709 if (pp) {
8710 SCTP_DBG_OBJCNT_INC(bind_bucket);
8711 pp->port = snum;
8712 pp->fastreuse = 0;
8713 INIT_HLIST_HEAD(&pp->owner);
8714 pp->net = net;
8715 hlist_add_head(&pp->node, &head->chain);
8716 }
8717 return pp;
8718 }
8719
8720 /* Caller must hold hashbucket lock for this tb with local BH disabled */
sctp_bucket_destroy(struct sctp_bind_bucket * pp)8721 static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
8722 {
8723 if (pp && hlist_empty(&pp->owner)) {
8724 __hlist_del(&pp->node);
8725 kmem_cache_free(sctp_bucket_cachep, pp);
8726 SCTP_DBG_OBJCNT_DEC(bind_bucket);
8727 }
8728 }
8729
8730 /* Release this socket's reference to a local port. */
__sctp_put_port(struct sock * sk)8731 static inline void __sctp_put_port(struct sock *sk)
8732 {
8733 struct sctp_bind_hashbucket *head =
8734 &sctp_port_hashtable[sctp_phashfn(sock_net(sk),
8735 inet_sk(sk)->inet_num)];
8736 struct sctp_bind_bucket *pp;
8737
8738 spin_lock(&head->lock);
8739 pp = sctp_sk(sk)->bind_hash;
8740 __sk_del_bind_node(sk);
8741 sctp_sk(sk)->bind_hash = NULL;
8742 inet_sk(sk)->inet_num = 0;
8743 sctp_bucket_destroy(pp);
8744 spin_unlock(&head->lock);
8745 }
8746
sctp_put_port(struct sock * sk)8747 void sctp_put_port(struct sock *sk)
8748 {
8749 local_bh_disable();
8750 __sctp_put_port(sk);
8751 local_bh_enable();
8752 }
8753
8754 /*
8755 * The system picks an ephemeral port and choose an address set equivalent
8756 * to binding with a wildcard address.
8757 * One of those addresses will be the primary address for the association.
8758 * This automatically enables the multihoming capability of SCTP.
8759 */
sctp_autobind(struct sock * sk)8760 static int sctp_autobind(struct sock *sk)
8761 {
8762 union sctp_addr autoaddr;
8763 struct sctp_af *af;
8764 __be16 port;
8765
8766 /* Initialize a local sockaddr structure to INADDR_ANY. */
8767 af = sctp_sk(sk)->pf->af;
8768
8769 port = htons(inet_sk(sk)->inet_num);
8770 af->inaddr_any(&autoaddr, port);
8771
8772 return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
8773 }
8774
8775 /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation.
8776 *
8777 * From RFC 2292
8778 * 4.2 The cmsghdr Structure *
8779 *
8780 * When ancillary data is sent or received, any number of ancillary data
8781 * objects can be specified by the msg_control and msg_controllen members of
8782 * the msghdr structure, because each object is preceded by
8783 * a cmsghdr structure defining the object's length (the cmsg_len member).
8784 * Historically Berkeley-derived implementations have passed only one object
8785 * at a time, but this API allows multiple objects to be
8786 * passed in a single call to sendmsg() or recvmsg(). The following example
8787 * shows two ancillary data objects in a control buffer.
8788 *
8789 * |<--------------------------- msg_controllen -------------------------->|
8790 * | |
8791 *
8792 * |<----- ancillary data object ----->|<----- ancillary data object ----->|
8793 *
8794 * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
8795 * | | |
8796 *
8797 * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| |
8798 *
8799 * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| |
8800 * | | | | |
8801 *
8802 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8803 * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX|
8804 *
8805 * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX|
8806 *
8807 * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
8808 * ^
8809 * |
8810 *
8811 * msg_control
8812 * points here
8813 */
sctp_msghdr_parse(const struct msghdr * msg,struct sctp_cmsgs * cmsgs)8814 static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
8815 {
8816 struct msghdr *my_msg = (struct msghdr *)msg;
8817 struct cmsghdr *cmsg;
8818
8819 for_each_cmsghdr(cmsg, my_msg) {
8820 if (!CMSG_OK(my_msg, cmsg))
8821 return -EINVAL;
8822
8823 /* Should we parse this header or ignore? */
8824 if (cmsg->cmsg_level != IPPROTO_SCTP)
8825 continue;
8826
8827 /* Strictly check lengths following example in SCM code. */
8828 switch (cmsg->cmsg_type) {
8829 case SCTP_INIT:
8830 /* SCTP Socket API Extension
8831 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
8832 *
8833 * This cmsghdr structure provides information for
8834 * initializing new SCTP associations with sendmsg().
8835 * The SCTP_INITMSG socket option uses this same data
8836 * structure. This structure is not used for
8837 * recvmsg().
8838 *
8839 * cmsg_level cmsg_type cmsg_data[]
8840 * ------------ ------------ ----------------------
8841 * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
8842 */
8843 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
8844 return -EINVAL;
8845
8846 cmsgs->init = CMSG_DATA(cmsg);
8847 break;
8848
8849 case SCTP_SNDRCV:
8850 /* SCTP Socket API Extension
8851 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
8852 *
8853 * This cmsghdr structure specifies SCTP options for
8854 * sendmsg() and describes SCTP header information
8855 * about a received message through recvmsg().
8856 *
8857 * cmsg_level cmsg_type cmsg_data[]
8858 * ------------ ------------ ----------------------
8859 * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
8860 */
8861 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
8862 return -EINVAL;
8863
8864 cmsgs->srinfo = CMSG_DATA(cmsg);
8865
8866 if (cmsgs->srinfo->sinfo_flags &
8867 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8868 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8869 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8870 return -EINVAL;
8871 break;
8872
8873 case SCTP_SNDINFO:
8874 /* SCTP Socket API Extension
8875 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
8876 *
8877 * This cmsghdr structure specifies SCTP options for
8878 * sendmsg(). This structure and SCTP_RCVINFO replaces
8879 * SCTP_SNDRCV which has been deprecated.
8880 *
8881 * cmsg_level cmsg_type cmsg_data[]
8882 * ------------ ------------ ---------------------
8883 * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
8884 */
8885 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
8886 return -EINVAL;
8887
8888 cmsgs->sinfo = CMSG_DATA(cmsg);
8889
8890 if (cmsgs->sinfo->snd_flags &
8891 ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
8892 SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
8893 SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
8894 return -EINVAL;
8895 break;
8896 case SCTP_PRINFO:
8897 /* SCTP Socket API Extension
8898 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
8899 *
8900 * This cmsghdr structure specifies SCTP options for sendmsg().
8901 *
8902 * cmsg_level cmsg_type cmsg_data[]
8903 * ------------ ------------ ---------------------
8904 * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
8905 */
8906 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
8907 return -EINVAL;
8908
8909 cmsgs->prinfo = CMSG_DATA(cmsg);
8910 if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
8911 return -EINVAL;
8912
8913 if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
8914 cmsgs->prinfo->pr_value = 0;
8915 break;
8916 case SCTP_AUTHINFO:
8917 /* SCTP Socket API Extension
8918 * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
8919 *
8920 * This cmsghdr structure specifies SCTP options for sendmsg().
8921 *
8922 * cmsg_level cmsg_type cmsg_data[]
8923 * ------------ ------------ ---------------------
8924 * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
8925 */
8926 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
8927 return -EINVAL;
8928
8929 cmsgs->authinfo = CMSG_DATA(cmsg);
8930 break;
8931 case SCTP_DSTADDRV4:
8932 case SCTP_DSTADDRV6:
8933 /* SCTP Socket API Extension
8934 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
8935 *
8936 * This cmsghdr structure specifies SCTP options for sendmsg().
8937 *
8938 * cmsg_level cmsg_type cmsg_data[]
8939 * ------------ ------------ ---------------------
8940 * IPPROTO_SCTP SCTP_DSTADDRV4 struct in_addr
8941 * ------------ ------------ ---------------------
8942 * IPPROTO_SCTP SCTP_DSTADDRV6 struct in6_addr
8943 */
8944 cmsgs->addrs_msg = my_msg;
8945 break;
8946 default:
8947 return -EINVAL;
8948 }
8949 }
8950
8951 return 0;
8952 }
8953
8954 /*
8955 * Wait for a packet..
8956 * Note: This function is the same function as in core/datagram.c
8957 * with a few modifications to make lksctp work.
8958 */
sctp_wait_for_packet(struct sock * sk,int * err,long * timeo_p)8959 static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
8960 {
8961 int error;
8962 DEFINE_WAIT(wait);
8963
8964 prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
8965
8966 /* Socket errors? */
8967 error = sock_error(sk);
8968 if (error)
8969 goto out;
8970
8971 if (!skb_queue_empty(&sk->sk_receive_queue))
8972 goto ready;
8973
8974 /* Socket shut down? */
8975 if (sk->sk_shutdown & RCV_SHUTDOWN)
8976 goto out;
8977
8978 /* Sequenced packets can come disconnected. If so we report the
8979 * problem.
8980 */
8981 error = -ENOTCONN;
8982
8983 /* Is there a good reason to think that we may receive some data? */
8984 if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
8985 goto out;
8986
8987 /* Handle signals. */
8988 if (signal_pending(current))
8989 goto interrupted;
8990
8991 /* Let another process have a go. Since we are going to sleep
8992 * anyway. Note: This may cause odd behaviors if the message
8993 * does not fit in the user's buffer, but this seems to be the
8994 * only way to honor MSG_DONTWAIT realistically.
8995 */
8996 release_sock(sk);
8997 *timeo_p = schedule_timeout(*timeo_p);
8998 lock_sock(sk);
8999
9000 ready:
9001 finish_wait(sk_sleep(sk), &wait);
9002 return 0;
9003
9004 interrupted:
9005 error = sock_intr_errno(*timeo_p);
9006
9007 out:
9008 finish_wait(sk_sleep(sk), &wait);
9009 *err = error;
9010 return error;
9011 }
9012
9013 /* Receive a datagram.
9014 * Note: This is pretty much the same routine as in core/datagram.c
9015 * with a few changes to make lksctp work.
9016 */
sctp_skb_recv_datagram(struct sock * sk,int flags,int * err)9017 struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, int *err)
9018 {
9019 int error;
9020 struct sk_buff *skb;
9021 long timeo;
9022
9023 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
9024
9025 pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
9026 MAX_SCHEDULE_TIMEOUT);
9027
9028 do {
9029 /* Again only user level code calls this function,
9030 * so nothing interrupt level
9031 * will suddenly eat the receive_queue.
9032 *
9033 * Look at current nfs client by the way...
9034 * However, this function was correct in any case. 8)
9035 */
9036 if (flags & MSG_PEEK) {
9037 skb = skb_peek(&sk->sk_receive_queue);
9038 if (skb)
9039 refcount_inc(&skb->users);
9040 } else {
9041 skb = __skb_dequeue(&sk->sk_receive_queue);
9042 }
9043
9044 if (skb)
9045 return skb;
9046
9047 /* Caller is allowed not to check sk->sk_err before calling. */
9048 error = sock_error(sk);
9049 if (error)
9050 goto no_packet;
9051
9052 if (sk->sk_shutdown & RCV_SHUTDOWN)
9053 break;
9054
9055
9056 /* User doesn't want to wait. */
9057 error = -EAGAIN;
9058 if (!timeo)
9059 goto no_packet;
9060 } while (sctp_wait_for_packet(sk, err, &timeo) == 0);
9061
9062 return NULL;
9063
9064 no_packet:
9065 *err = error;
9066 return NULL;
9067 }
9068
9069 /* If sndbuf has changed, wake up per association sndbuf waiters. */
__sctp_write_space(struct sctp_association * asoc)9070 static void __sctp_write_space(struct sctp_association *asoc)
9071 {
9072 struct sock *sk = asoc->base.sk;
9073
9074 if (sctp_wspace(asoc) <= 0)
9075 return;
9076
9077 if (waitqueue_active(&asoc->wait))
9078 wake_up_interruptible(&asoc->wait);
9079
9080 if (sctp_writeable(sk)) {
9081 struct socket_wq *wq;
9082
9083 rcu_read_lock();
9084 wq = rcu_dereference(sk->sk_wq);
9085 if (wq) {
9086 if (waitqueue_active(&wq->wait))
9087 wake_up_interruptible(&wq->wait);
9088
9089 /* Note that we try to include the Async I/O support
9090 * here by modeling from the current TCP/UDP code.
9091 * We have not tested with it yet.
9092 */
9093 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
9094 sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
9095 }
9096 rcu_read_unlock();
9097 }
9098 }
9099
sctp_wake_up_waiters(struct sock * sk,struct sctp_association * asoc)9100 static void sctp_wake_up_waiters(struct sock *sk,
9101 struct sctp_association *asoc)
9102 {
9103 struct sctp_association *tmp = asoc;
9104
9105 /* We do accounting for the sndbuf space per association,
9106 * so we only need to wake our own association.
9107 */
9108 if (asoc->ep->sndbuf_policy)
9109 return __sctp_write_space(asoc);
9110
9111 /* If association goes down and is just flushing its
9112 * outq, then just normally notify others.
9113 */
9114 if (asoc->base.dead)
9115 return sctp_write_space(sk);
9116
9117 /* Accounting for the sndbuf space is per socket, so we
9118 * need to wake up others, try to be fair and in case of
9119 * other associations, let them have a go first instead
9120 * of just doing a sctp_write_space() call.
9121 *
9122 * Note that we reach sctp_wake_up_waiters() only when
9123 * associations free up queued chunks, thus we are under
9124 * lock and the list of associations on a socket is
9125 * guaranteed not to change.
9126 */
9127 for (tmp = list_next_entry(tmp, asocs); 1;
9128 tmp = list_next_entry(tmp, asocs)) {
9129 /* Manually skip the head element. */
9130 if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
9131 continue;
9132 /* Wake up association. */
9133 __sctp_write_space(tmp);
9134 /* We've reached the end. */
9135 if (tmp == asoc)
9136 break;
9137 }
9138 }
9139
9140 /* Do accounting for the sndbuf space.
9141 * Decrement the used sndbuf space of the corresponding association by the
9142 * data size which was just transmitted(freed).
9143 */
sctp_wfree(struct sk_buff * skb)9144 static void sctp_wfree(struct sk_buff *skb)
9145 {
9146 struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
9147 struct sctp_association *asoc = chunk->asoc;
9148 struct sock *sk = asoc->base.sk;
9149
9150 sk_mem_uncharge(sk, skb->truesize);
9151 sk_wmem_queued_add(sk, -(skb->truesize + sizeof(struct sctp_chunk)));
9152 asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk);
9153 WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk),
9154 &sk->sk_wmem_alloc));
9155
9156 if (chunk->shkey) {
9157 struct sctp_shared_key *shkey = chunk->shkey;
9158
9159 /* refcnt == 2 and !list_empty mean after this release, it's
9160 * not being used anywhere, and it's time to notify userland
9161 * that this shkey can be freed if it's been deactivated.
9162 */
9163 if (shkey->deactivated && !list_empty(&shkey->key_list) &&
9164 refcount_read(&shkey->refcnt) == 2) {
9165 struct sctp_ulpevent *ev;
9166
9167 ev = sctp_ulpevent_make_authkey(asoc, shkey->key_id,
9168 SCTP_AUTH_FREE_KEY,
9169 GFP_KERNEL);
9170 if (ev)
9171 asoc->stream.si->enqueue_event(&asoc->ulpq, ev);
9172 }
9173 sctp_auth_shkey_release(chunk->shkey);
9174 }
9175
9176 sock_wfree(skb);
9177 sctp_wake_up_waiters(sk, asoc);
9178
9179 sctp_association_put(asoc);
9180 }
9181
9182 /* Do accounting for the receive space on the socket.
9183 * Accounting for the association is done in ulpevent.c
9184 * We set this as a destructor for the cloned data skbs so that
9185 * accounting is done at the correct time.
9186 */
sctp_sock_rfree(struct sk_buff * skb)9187 void sctp_sock_rfree(struct sk_buff *skb)
9188 {
9189 struct sock *sk = skb->sk;
9190 struct sctp_ulpevent *event = sctp_skb2event(skb);
9191
9192 atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
9193
9194 /*
9195 * Mimic the behavior of sock_rfree
9196 */
9197 sk_mem_uncharge(sk, event->rmem_len);
9198 }
9199
9200
9201 /* Helper function to wait for space in the sndbuf. */
sctp_wait_for_sndbuf(struct sctp_association * asoc,long * timeo_p,size_t msg_len)9202 static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
9203 size_t msg_len)
9204 {
9205 struct sock *sk = asoc->base.sk;
9206 long current_timeo = *timeo_p;
9207 DEFINE_WAIT(wait);
9208 int err = 0;
9209
9210 pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
9211 *timeo_p, msg_len);
9212
9213 /* Increment the association's refcnt. */
9214 sctp_association_hold(asoc);
9215
9216 /* Wait on the association specific sndbuf space. */
9217 for (;;) {
9218 prepare_to_wait_exclusive(&asoc->wait, &wait,
9219 TASK_INTERRUPTIBLE);
9220 if (asoc->base.dead)
9221 goto do_dead;
9222 if (!*timeo_p)
9223 goto do_nonblock;
9224 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
9225 goto do_error;
9226 if (signal_pending(current))
9227 goto do_interrupted;
9228 if ((int)msg_len <= sctp_wspace(asoc) &&
9229 sk_wmem_schedule(sk, msg_len))
9230 break;
9231
9232 /* Let another process have a go. Since we are going
9233 * to sleep anyway.
9234 */
9235 release_sock(sk);
9236 current_timeo = schedule_timeout(current_timeo);
9237 lock_sock(sk);
9238 if (sk != asoc->base.sk)
9239 goto do_error;
9240
9241 *timeo_p = current_timeo;
9242 }
9243
9244 out:
9245 finish_wait(&asoc->wait, &wait);
9246
9247 /* Release the association's refcnt. */
9248 sctp_association_put(asoc);
9249
9250 return err;
9251
9252 do_dead:
9253 err = -ESRCH;
9254 goto out;
9255
9256 do_error:
9257 err = -EPIPE;
9258 goto out;
9259
9260 do_interrupted:
9261 err = sock_intr_errno(*timeo_p);
9262 goto out;
9263
9264 do_nonblock:
9265 err = -EAGAIN;
9266 goto out;
9267 }
9268
sctp_data_ready(struct sock * sk)9269 void sctp_data_ready(struct sock *sk)
9270 {
9271 struct socket_wq *wq;
9272
9273 trace_sk_data_ready(sk);
9274
9275 rcu_read_lock();
9276 wq = rcu_dereference(sk->sk_wq);
9277 if (skwq_has_sleeper(wq))
9278 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
9279 EPOLLRDNORM | EPOLLRDBAND);
9280 sk_wake_async_rcu(sk, SOCK_WAKE_WAITD, POLL_IN);
9281 rcu_read_unlock();
9282 }
9283
9284 /* If socket sndbuf has changed, wake up all per association waiters. */
sctp_write_space(struct sock * sk)9285 void sctp_write_space(struct sock *sk)
9286 {
9287 struct sctp_association *asoc;
9288
9289 /* Wake up the tasks in each wait queue. */
9290 list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
9291 __sctp_write_space(asoc);
9292 }
9293 }
9294
9295 /* Is there any sndbuf space available on the socket?
9296 *
9297 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
9298 * associations on the same socket. For a UDP-style socket with
9299 * multiple associations, it is possible for it to be "unwriteable"
9300 * prematurely. I assume that this is acceptable because
9301 * a premature "unwriteable" is better than an accidental "writeable" which
9302 * would cause an unwanted block under certain circumstances. For the 1-1
9303 * UDP-style sockets or TCP-style sockets, this code should work.
9304 * - Daisy
9305 */
sctp_writeable(const struct sock * sk)9306 static bool sctp_writeable(const struct sock *sk)
9307 {
9308 return READ_ONCE(sk->sk_sndbuf) > READ_ONCE(sk->sk_wmem_queued);
9309 }
9310
9311 /* Wait for an association to go into ESTABLISHED state. If timeout is 0,
9312 * returns immediately with EINPROGRESS.
9313 */
sctp_wait_for_connect(struct sctp_association * asoc,long * timeo_p)9314 static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
9315 {
9316 struct sock *sk = asoc->base.sk;
9317 int err = 0;
9318 long current_timeo = *timeo_p;
9319 DEFINE_WAIT(wait);
9320
9321 pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
9322
9323 /* Increment the association's refcnt. */
9324 sctp_association_hold(asoc);
9325
9326 for (;;) {
9327 prepare_to_wait_exclusive(&asoc->wait, &wait,
9328 TASK_INTERRUPTIBLE);
9329 if (!*timeo_p)
9330 goto do_nonblock;
9331 if (sk->sk_shutdown & RCV_SHUTDOWN)
9332 break;
9333 if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
9334 asoc->base.dead)
9335 goto do_error;
9336 if (signal_pending(current))
9337 goto do_interrupted;
9338
9339 if (sctp_state(asoc, ESTABLISHED))
9340 break;
9341
9342 /* Let another process have a go. Since we are going
9343 * to sleep anyway.
9344 */
9345 release_sock(sk);
9346 current_timeo = schedule_timeout(current_timeo);
9347 lock_sock(sk);
9348
9349 *timeo_p = current_timeo;
9350 }
9351
9352 out:
9353 finish_wait(&asoc->wait, &wait);
9354
9355 /* Release the association's refcnt. */
9356 sctp_association_put(asoc);
9357
9358 return err;
9359
9360 do_error:
9361 if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
9362 err = -ETIMEDOUT;
9363 else
9364 err = -ECONNREFUSED;
9365 goto out;
9366
9367 do_interrupted:
9368 err = sock_intr_errno(*timeo_p);
9369 goto out;
9370
9371 do_nonblock:
9372 err = -EINPROGRESS;
9373 goto out;
9374 }
9375
sctp_wait_for_accept(struct sock * sk,long timeo)9376 static int sctp_wait_for_accept(struct sock *sk, long timeo)
9377 {
9378 struct sctp_endpoint *ep;
9379 int err = 0;
9380 DEFINE_WAIT(wait);
9381
9382 ep = sctp_sk(sk)->ep;
9383
9384
9385 for (;;) {
9386 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9387 TASK_INTERRUPTIBLE);
9388
9389 if (list_empty(&ep->asocs)) {
9390 release_sock(sk);
9391 timeo = schedule_timeout(timeo);
9392 lock_sock(sk);
9393 }
9394
9395 err = -EINVAL;
9396 if (!sctp_sstate(sk, LISTENING))
9397 break;
9398
9399 err = 0;
9400 if (!list_empty(&ep->asocs))
9401 break;
9402
9403 err = sock_intr_errno(timeo);
9404 if (signal_pending(current))
9405 break;
9406
9407 err = -EAGAIN;
9408 if (!timeo)
9409 break;
9410 }
9411
9412 finish_wait(sk_sleep(sk), &wait);
9413
9414 return err;
9415 }
9416
sctp_wait_for_close(struct sock * sk,long timeout)9417 static void sctp_wait_for_close(struct sock *sk, long timeout)
9418 {
9419 DEFINE_WAIT(wait);
9420
9421 do {
9422 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
9423 if (list_empty(&sctp_sk(sk)->ep->asocs))
9424 break;
9425 release_sock(sk);
9426 timeout = schedule_timeout(timeout);
9427 lock_sock(sk);
9428 } while (!signal_pending(current) && timeout);
9429
9430 finish_wait(sk_sleep(sk), &wait);
9431 }
9432
sctp_skb_set_owner_r_frag(struct sk_buff * skb,struct sock * sk)9433 static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
9434 {
9435 struct sk_buff *frag;
9436
9437 if (!skb->data_len)
9438 goto done;
9439
9440 /* Don't forget the fragments. */
9441 skb_walk_frags(skb, frag)
9442 sctp_skb_set_owner_r_frag(frag, sk);
9443
9444 done:
9445 sctp_skb_set_owner_r(skb, sk);
9446 }
9447
sctp_copy_sock(struct sock * newsk,struct sock * sk,struct sctp_association * asoc)9448 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
9449 struct sctp_association *asoc)
9450 {
9451 struct inet_sock *inet = inet_sk(sk);
9452 struct inet_sock *newinet;
9453 struct sctp_sock *sp = sctp_sk(sk);
9454
9455 newsk->sk_type = sk->sk_type;
9456 newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
9457 newsk->sk_flags = sk->sk_flags;
9458 newsk->sk_tsflags = sk->sk_tsflags;
9459 newsk->sk_no_check_tx = sk->sk_no_check_tx;
9460 newsk->sk_no_check_rx = sk->sk_no_check_rx;
9461 newsk->sk_reuse = sk->sk_reuse;
9462 sctp_sk(newsk)->reuse = sp->reuse;
9463
9464 newsk->sk_shutdown = sk->sk_shutdown;
9465 newsk->sk_destruct = sk->sk_destruct;
9466 newsk->sk_family = sk->sk_family;
9467 newsk->sk_protocol = IPPROTO_SCTP;
9468 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
9469 newsk->sk_sndbuf = sk->sk_sndbuf;
9470 newsk->sk_rcvbuf = sk->sk_rcvbuf;
9471 newsk->sk_lingertime = sk->sk_lingertime;
9472 newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
9473 newsk->sk_sndtimeo = sk->sk_sndtimeo;
9474 newsk->sk_rxhash = sk->sk_rxhash;
9475
9476 newinet = inet_sk(newsk);
9477
9478 /* Initialize sk's sport, dport, rcv_saddr and daddr for
9479 * getsockname() and getpeername()
9480 */
9481 newinet->inet_sport = inet->inet_sport;
9482 newinet->inet_saddr = inet->inet_saddr;
9483 newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
9484 newinet->inet_dport = htons(asoc->peer.port);
9485 newinet->pmtudisc = inet->pmtudisc;
9486 atomic_set(&newinet->inet_id, get_random_u16());
9487
9488 newinet->uc_ttl = inet->uc_ttl;
9489 inet_set_bit(MC_LOOP, newsk);
9490 newinet->mc_ttl = 1;
9491 newinet->mc_index = 0;
9492 newinet->mc_list = NULL;
9493
9494 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
9495 net_enable_timestamp();
9496
9497 /* Set newsk security attributes from original sk and connection
9498 * security attribute from asoc.
9499 */
9500 security_sctp_sk_clone(asoc, sk, newsk);
9501 }
9502
sctp_copy_descendant(struct sock * sk_to,const struct sock * sk_from)9503 static inline void sctp_copy_descendant(struct sock *sk_to,
9504 const struct sock *sk_from)
9505 {
9506 size_t ancestor_size = sizeof(struct inet_sock);
9507
9508 ancestor_size += sk_from->sk_prot->obj_size;
9509 ancestor_size -= offsetof(struct sctp_sock, pd_lobby);
9510 __inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
9511 }
9512
9513 /* Populate the fields of the newsk from the oldsk and migrate the assoc
9514 * and its messages to the newsk.
9515 */
sctp_sock_migrate(struct sock * oldsk,struct sock * newsk,struct sctp_association * assoc,enum sctp_socket_type type)9516 static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
9517 struct sctp_association *assoc,
9518 enum sctp_socket_type type)
9519 {
9520 struct sctp_sock *oldsp = sctp_sk(oldsk);
9521 struct sctp_sock *newsp = sctp_sk(newsk);
9522 struct sctp_bind_bucket *pp; /* hash list port iterator */
9523 struct sctp_endpoint *newep = newsp->ep;
9524 struct sk_buff *skb, *tmp;
9525 struct sctp_ulpevent *event;
9526 struct sctp_bind_hashbucket *head;
9527 int err;
9528
9529 /* Migrate socket buffer sizes and all the socket level options to the
9530 * new socket.
9531 */
9532 newsk->sk_sndbuf = oldsk->sk_sndbuf;
9533 newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
9534 /* Brute force copy old sctp opt. */
9535 sctp_copy_descendant(newsk, oldsk);
9536
9537 /* Restore the ep value that was overwritten with the above structure
9538 * copy.
9539 */
9540 newsp->ep = newep;
9541 newsp->hmac = NULL;
9542
9543 /* Hook this new socket in to the bind_hash list. */
9544 head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
9545 inet_sk(oldsk)->inet_num)];
9546 spin_lock_bh(&head->lock);
9547 pp = sctp_sk(oldsk)->bind_hash;
9548 sk_add_bind_node(newsk, &pp->owner);
9549 sctp_sk(newsk)->bind_hash = pp;
9550 inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
9551 spin_unlock_bh(&head->lock);
9552
9553 /* Copy the bind_addr list from the original endpoint to the new
9554 * endpoint so that we can handle restarts properly
9555 */
9556 err = sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
9557 &oldsp->ep->base.bind_addr, GFP_KERNEL);
9558 if (err)
9559 return err;
9560
9561 /* New ep's auth_hmacs should be set if old ep's is set, in case
9562 * that net->sctp.auth_enable has been changed to 0 by users and
9563 * new ep's auth_hmacs couldn't be set in sctp_endpoint_init().
9564 */
9565 if (oldsp->ep->auth_hmacs) {
9566 err = sctp_auth_init_hmacs(newsp->ep, GFP_KERNEL);
9567 if (err)
9568 return err;
9569 }
9570
9571 sctp_auto_asconf_init(newsp);
9572
9573 /* Move any messages in the old socket's receive queue that are for the
9574 * peeled off association to the new socket's receive queue.
9575 */
9576 sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
9577 event = sctp_skb2event(skb);
9578 if (event->asoc == assoc) {
9579 __skb_unlink(skb, &oldsk->sk_receive_queue);
9580 __skb_queue_tail(&newsk->sk_receive_queue, skb);
9581 sctp_skb_set_owner_r_frag(skb, newsk);
9582 }
9583 }
9584
9585 /* Clean up any messages pending delivery due to partial
9586 * delivery. Three cases:
9587 * 1) No partial deliver; no work.
9588 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
9589 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
9590 */
9591 atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
9592
9593 if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
9594 struct sk_buff_head *queue;
9595
9596 /* Decide which queue to move pd_lobby skbs to. */
9597 if (assoc->ulpq.pd_mode) {
9598 queue = &newsp->pd_lobby;
9599 } else
9600 queue = &newsk->sk_receive_queue;
9601
9602 /* Walk through the pd_lobby, looking for skbs that
9603 * need moved to the new socket.
9604 */
9605 sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
9606 event = sctp_skb2event(skb);
9607 if (event->asoc == assoc) {
9608 __skb_unlink(skb, &oldsp->pd_lobby);
9609 __skb_queue_tail(queue, skb);
9610 sctp_skb_set_owner_r_frag(skb, newsk);
9611 }
9612 }
9613
9614 /* Clear up any skbs waiting for the partial
9615 * delivery to finish.
9616 */
9617 if (assoc->ulpq.pd_mode)
9618 sctp_clear_pd(oldsk, NULL);
9619
9620 }
9621
9622 sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
9623
9624 /* Set the type of socket to indicate that it is peeled off from the
9625 * original UDP-style socket or created with the accept() call on a
9626 * TCP-style socket..
9627 */
9628 newsp->type = type;
9629
9630 /* Mark the new socket "in-use" by the user so that any packets
9631 * that may arrive on the association after we've moved it are
9632 * queued to the backlog. This prevents a potential race between
9633 * backlog processing on the old socket and new-packet processing
9634 * on the new socket.
9635 *
9636 * The caller has just allocated newsk so we can guarantee that other
9637 * paths won't try to lock it and then oldsk.
9638 */
9639 lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
9640 sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
9641 sctp_assoc_migrate(assoc, newsk);
9642 sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
9643
9644 /* If the association on the newsk is already closed before accept()
9645 * is called, set RCV_SHUTDOWN flag.
9646 */
9647 if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
9648 inet_sk_set_state(newsk, SCTP_SS_CLOSED);
9649 newsk->sk_shutdown |= RCV_SHUTDOWN;
9650 } else {
9651 inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
9652 }
9653
9654 release_sock(newsk);
9655
9656 return 0;
9657 }
9658
9659
9660 /* This proto struct describes the ULP interface for SCTP. */
9661 struct proto sctp_prot = {
9662 .name = "SCTP",
9663 .owner = THIS_MODULE,
9664 .close = sctp_close,
9665 .disconnect = sctp_disconnect,
9666 .accept = sctp_accept,
9667 .ioctl = sctp_ioctl,
9668 .init = sctp_init_sock,
9669 .destroy = sctp_destroy_sock,
9670 .shutdown = sctp_shutdown,
9671 .setsockopt = sctp_setsockopt,
9672 .getsockopt = sctp_getsockopt,
9673 .bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9674 .sendmsg = sctp_sendmsg,
9675 .recvmsg = sctp_recvmsg,
9676 .bind = sctp_bind,
9677 .bind_add = sctp_bind_add,
9678 .backlog_rcv = sctp_backlog_rcv,
9679 .hash = sctp_hash,
9680 .unhash = sctp_unhash,
9681 .no_autobind = true,
9682 .obj_size = sizeof(struct sctp_sock),
9683 .useroffset = offsetof(struct sctp_sock, subscribe),
9684 .usersize = offsetof(struct sctp_sock, initmsg) -
9685 offsetof(struct sctp_sock, subscribe) +
9686 sizeof_field(struct sctp_sock, initmsg),
9687 .sysctl_mem = sysctl_sctp_mem,
9688 .sysctl_rmem = sysctl_sctp_rmem,
9689 .sysctl_wmem = sysctl_sctp_wmem,
9690 .memory_pressure = &sctp_memory_pressure,
9691 .enter_memory_pressure = sctp_enter_memory_pressure,
9692
9693 .memory_allocated = &sctp_memory_allocated,
9694 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9695
9696 .sockets_allocated = &sctp_sockets_allocated,
9697 };
9698
9699 #if IS_ENABLED(CONFIG_IPV6)
9700
sctp_v6_destruct_sock(struct sock * sk)9701 static void sctp_v6_destruct_sock(struct sock *sk)
9702 {
9703 sctp_destruct_common(sk);
9704 inet6_sock_destruct(sk);
9705 }
9706
sctp_v6_init_sock(struct sock * sk)9707 static int sctp_v6_init_sock(struct sock *sk)
9708 {
9709 int ret = sctp_init_sock(sk);
9710
9711 if (!ret)
9712 sk->sk_destruct = sctp_v6_destruct_sock;
9713
9714 return ret;
9715 }
9716
9717 struct proto sctpv6_prot = {
9718 .name = "SCTPv6",
9719 .owner = THIS_MODULE,
9720 .close = sctp_close,
9721 .disconnect = sctp_disconnect,
9722 .accept = sctp_accept,
9723 .ioctl = sctp_ioctl,
9724 .init = sctp_v6_init_sock,
9725 .destroy = sctp_destroy_sock,
9726 .shutdown = sctp_shutdown,
9727 .setsockopt = sctp_setsockopt,
9728 .getsockopt = sctp_getsockopt,
9729 .bpf_bypass_getsockopt = sctp_bpf_bypass_getsockopt,
9730 .sendmsg = sctp_sendmsg,
9731 .recvmsg = sctp_recvmsg,
9732 .bind = sctp_bind,
9733 .bind_add = sctp_bind_add,
9734 .backlog_rcv = sctp_backlog_rcv,
9735 .hash = sctp_hash,
9736 .unhash = sctp_unhash,
9737 .no_autobind = true,
9738 .obj_size = sizeof(struct sctp6_sock),
9739 .ipv6_pinfo_offset = offsetof(struct sctp6_sock, inet6),
9740 .useroffset = offsetof(struct sctp6_sock, sctp.subscribe),
9741 .usersize = offsetof(struct sctp6_sock, sctp.initmsg) -
9742 offsetof(struct sctp6_sock, sctp.subscribe) +
9743 sizeof_field(struct sctp6_sock, sctp.initmsg),
9744 .sysctl_mem = sysctl_sctp_mem,
9745 .sysctl_rmem = sysctl_sctp_rmem,
9746 .sysctl_wmem = sysctl_sctp_wmem,
9747 .memory_pressure = &sctp_memory_pressure,
9748 .enter_memory_pressure = sctp_enter_memory_pressure,
9749
9750 .memory_allocated = &sctp_memory_allocated,
9751 .per_cpu_fw_alloc = &sctp_memory_per_cpu_fw_alloc,
9752
9753 .sockets_allocated = &sctp_sockets_allocated,
9754 };
9755 #endif /* IS_ENABLED(CONFIG_IPV6) */
9756