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1 | /* SCTP kernel implementation |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. |
4 | * Copyright (c) 1999-2001 Motorola, Inc. |
5 | * Copyright (c) 2001-2003 Intel Corp. |
6 | * Copyright (c) 2001-2002 Nokia, Inc. |
7 | * Copyright (c) 2001 La Monte H.P. Yarroll |
8 | * |
9 | * This file is part of the SCTP kernel implementation |
10 | * |
11 | * These functions interface with the sockets layer to implement the |
12 | * SCTP Extensions for the Sockets API. |
13 | * |
14 | * Note that the descriptions from the specification are USER level |
15 | * functions--this file is the functions which populate the struct proto |
16 | * for SCTP which is the BOTTOM of the sockets interface. |
17 | * |
18 | * This SCTP implementation is free software; |
19 | * you can redistribute it and/or modify it under the terms of |
20 | * the GNU General Public License as published by |
21 | * the Free Software Foundation; either version 2, or (at your option) |
22 | * any later version. |
23 | * |
24 | * This SCTP implementation is distributed in the hope that it |
25 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
26 | * ************************ |
27 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
28 | * See the GNU General Public License for more details. |
29 | * |
30 | * You should have received a copy of the GNU General Public License |
31 | * along with GNU CC; see the file COPYING. If not, write to |
32 | * the Free Software Foundation, 59 Temple Place - Suite 330, |
33 | * Boston, MA 02111-1307, USA. |
34 | * |
35 | * Please send any bug reports or fixes you make to the |
36 | * email address(es): |
37 | * lksctp developers <lksctp-developers@lists.sourceforge.net> |
38 | * |
39 | * Or submit a bug report through the following website: |
40 | * http://www.sf.net/projects/lksctp |
41 | * |
42 | * Written or modified by: |
43 | * La Monte H.P. Yarroll <piggy@acm.org> |
44 | * Narasimha Budihal <narsi@refcode.org> |
45 | * Karl Knutson <karl@athena.chicago.il.us> |
46 | * Jon Grimm <jgrimm@us.ibm.com> |
47 | * Xingang Guo <xingang.guo@intel.com> |
48 | * Daisy Chang <daisyc@us.ibm.com> |
49 | * Sridhar Samudrala <samudrala@us.ibm.com> |
50 | * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com> |
51 | * Ardelle Fan <ardelle.fan@intel.com> |
52 | * Ryan Layer <rmlayer@us.ibm.com> |
53 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> |
54 | * Kevin Gao <kevin.gao@intel.com> |
55 | * |
56 | * Any bugs reported given to us we will try to fix... any fixes shared will |
57 | * be incorporated into the next SCTP release. |
58 | */ |
59 | |
60 | #include <linux/types.h> |
61 | #include <linux/kernel.h> |
62 | #include <linux/wait.h> |
63 | #include <linux/time.h> |
64 | #include <linux/ip.h> |
65 | #include <linux/capability.h> |
66 | #include <linux/fcntl.h> |
67 | #include <linux/poll.h> |
68 | #include <linux/init.h> |
69 | #include <linux/crypto.h> |
70 | #include <linux/slab.h> |
71 | |
72 | #include <net/ip.h> |
73 | #include <net/icmp.h> |
74 | #include <net/route.h> |
75 | #include <net/ipv6.h> |
76 | #include <net/inet_common.h> |
77 | |
78 | #include <linux/socket.h> /* for sa_family_t */ |
79 | #include <net/sock.h> |
80 | #include <net/sctp/sctp.h> |
81 | #include <net/sctp/sm.h> |
82 | |
83 | /* WARNING: Please do not remove the SCTP_STATIC attribute to |
84 | * any of the functions below as they are used to export functions |
85 | * used by a project regression testsuite. |
86 | */ |
87 | |
88 | /* Forward declarations for internal helper functions. */ |
89 | static int sctp_writeable(struct sock *sk); |
90 | static void sctp_wfree(struct sk_buff *skb); |
91 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, |
92 | size_t msg_len); |
93 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p); |
94 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); |
95 | static int sctp_wait_for_accept(struct sock *sk, long timeo); |
96 | static void sctp_wait_for_close(struct sock *sk, long timeo); |
97 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
98 | union sctp_addr *addr, int len); |
99 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); |
100 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); |
101 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); |
102 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); |
103 | static int sctp_send_asconf(struct sctp_association *asoc, |
104 | struct sctp_chunk *chunk); |
105 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); |
106 | static int sctp_autobind(struct sock *sk); |
107 | static void sctp_sock_migrate(struct sock *, struct sock *, |
108 | struct sctp_association *, sctp_socket_type_t); |
109 | static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG; |
110 | |
111 | extern struct kmem_cache *sctp_bucket_cachep; |
112 | extern int sysctl_sctp_mem[3]; |
113 | extern int sysctl_sctp_rmem[3]; |
114 | extern int sysctl_sctp_wmem[3]; |
115 | |
116 | static int sctp_memory_pressure; |
117 | static atomic_t sctp_memory_allocated; |
118 | struct percpu_counter sctp_sockets_allocated; |
119 | |
120 | static void sctp_enter_memory_pressure(struct sock *sk) |
121 | { |
122 | sctp_memory_pressure = 1; |
123 | } |
124 | |
125 | |
126 | /* Get the sndbuf space available at the time on the association. */ |
127 | static inline int sctp_wspace(struct sctp_association *asoc) |
128 | { |
129 | int amt; |
130 | |
131 | if (asoc->ep->sndbuf_policy) |
132 | amt = asoc->sndbuf_used; |
133 | else |
134 | amt = sk_wmem_alloc_get(asoc->base.sk); |
135 | |
136 | if (amt >= asoc->base.sk->sk_sndbuf) { |
137 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) |
138 | amt = 0; |
139 | else { |
140 | amt = sk_stream_wspace(asoc->base.sk); |
141 | if (amt < 0) |
142 | amt = 0; |
143 | } |
144 | } else { |
145 | amt = asoc->base.sk->sk_sndbuf - amt; |
146 | } |
147 | return amt; |
148 | } |
149 | |
150 | /* Increment the used sndbuf space count of the corresponding association by |
151 | * the size of the outgoing data chunk. |
152 | * Also, set the skb destructor for sndbuf accounting later. |
153 | * |
154 | * Since it is always 1-1 between chunk and skb, and also a new skb is always |
155 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the |
156 | * destructor in the data chunk skb for the purpose of the sndbuf space |
157 | * tracking. |
158 | */ |
159 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) |
160 | { |
161 | struct sctp_association *asoc = chunk->asoc; |
162 | struct sock *sk = asoc->base.sk; |
163 | |
164 | /* The sndbuf space is tracked per association. */ |
165 | sctp_association_hold(asoc); |
166 | |
167 | skb_set_owner_w(chunk->skb, sk); |
168 | |
169 | chunk->skb->destructor = sctp_wfree; |
170 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ |
171 | *((struct sctp_chunk **)(chunk->skb->cb)) = chunk; |
172 | |
173 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
174 | sizeof(struct sk_buff) + |
175 | sizeof(struct sctp_chunk); |
176 | |
177 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
178 | sk->sk_wmem_queued += chunk->skb->truesize; |
179 | sk_mem_charge(sk, chunk->skb->truesize); |
180 | } |
181 | |
182 | /* Verify that this is a valid address. */ |
183 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, |
184 | int len) |
185 | { |
186 | struct sctp_af *af; |
187 | |
188 | /* Verify basic sockaddr. */ |
189 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); |
190 | if (!af) |
191 | return -EINVAL; |
192 | |
193 | /* Is this a valid SCTP address? */ |
194 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
195 | return -EINVAL; |
196 | |
197 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) |
198 | return -EINVAL; |
199 | |
200 | return 0; |
201 | } |
202 | |
203 | /* Look up the association by its id. If this is not a UDP-style |
204 | * socket, the ID field is always ignored. |
205 | */ |
206 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) |
207 | { |
208 | struct sctp_association *asoc = NULL; |
209 | |
210 | /* If this is not a UDP-style socket, assoc id should be ignored. */ |
211 | if (!sctp_style(sk, UDP)) { |
212 | /* Return NULL if the socket state is not ESTABLISHED. It |
213 | * could be a TCP-style listening socket or a socket which |
214 | * hasn't yet called connect() to establish an association. |
215 | */ |
216 | if (!sctp_sstate(sk, ESTABLISHED)) |
217 | return NULL; |
218 | |
219 | /* Get the first and the only association from the list. */ |
220 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) |
221 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, |
222 | struct sctp_association, asocs); |
223 | return asoc; |
224 | } |
225 | |
226 | /* Otherwise this is a UDP-style socket. */ |
227 | if (!id || (id == (sctp_assoc_t)-1)) |
228 | return NULL; |
229 | |
230 | spin_lock_bh(&sctp_assocs_id_lock); |
231 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); |
232 | spin_unlock_bh(&sctp_assocs_id_lock); |
233 | |
234 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) |
235 | return NULL; |
236 | |
237 | return asoc; |
238 | } |
239 | |
240 | /* Look up the transport from an address and an assoc id. If both address and |
241 | * id are specified, the associations matching the address and the id should be |
242 | * the same. |
243 | */ |
244 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, |
245 | struct sockaddr_storage *addr, |
246 | sctp_assoc_t id) |
247 | { |
248 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; |
249 | struct sctp_transport *transport; |
250 | union sctp_addr *laddr = (union sctp_addr *)addr; |
251 | |
252 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
253 | laddr, |
254 | &transport); |
255 | |
256 | if (!addr_asoc) |
257 | return NULL; |
258 | |
259 | id_asoc = sctp_id2assoc(sk, id); |
260 | if (id_asoc && (id_asoc != addr_asoc)) |
261 | return NULL; |
262 | |
263 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), |
264 | (union sctp_addr *)addr); |
265 | |
266 | return transport; |
267 | } |
268 | |
269 | /* API 3.1.2 bind() - UDP Style Syntax |
270 | * The syntax of bind() is, |
271 | * |
272 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); |
273 | * |
274 | * sd - the socket descriptor returned by socket(). |
275 | * addr - the address structure (struct sockaddr_in or struct |
276 | * sockaddr_in6 [RFC 2553]), |
277 | * addr_len - the size of the address structure. |
278 | */ |
279 | SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
280 | { |
281 | int retval = 0; |
282 | |
283 | sctp_lock_sock(sk); |
284 | |
285 | SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n", |
286 | sk, addr, addr_len); |
287 | |
288 | /* Disallow binding twice. */ |
289 | if (!sctp_sk(sk)->ep->base.bind_addr.port) |
290 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
291 | addr_len); |
292 | else |
293 | retval = -EINVAL; |
294 | |
295 | sctp_release_sock(sk); |
296 | |
297 | return retval; |
298 | } |
299 | |
300 | static long sctp_get_port_local(struct sock *, union sctp_addr *); |
301 | |
302 | /* Verify this is a valid sockaddr. */ |
303 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
304 | union sctp_addr *addr, int len) |
305 | { |
306 | struct sctp_af *af; |
307 | |
308 | /* Check minimum size. */ |
309 | if (len < sizeof (struct sockaddr)) |
310 | return NULL; |
311 | |
312 | /* V4 mapped address are really of AF_INET family */ |
313 | if (addr->sa.sa_family == AF_INET6 && |
314 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { |
315 | if (!opt->pf->af_supported(AF_INET, opt)) |
316 | return NULL; |
317 | } else { |
318 | /* Does this PF support this AF? */ |
319 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) |
320 | return NULL; |
321 | } |
322 | |
323 | /* If we get this far, af is valid. */ |
324 | af = sctp_get_af_specific(addr->sa.sa_family); |
325 | |
326 | if (len < af->sockaddr_len) |
327 | return NULL; |
328 | |
329 | return af; |
330 | } |
331 | |
332 | /* Bind a local address either to an endpoint or to an association. */ |
333 | SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) |
334 | { |
335 | struct sctp_sock *sp = sctp_sk(sk); |
336 | struct sctp_endpoint *ep = sp->ep; |
337 | struct sctp_bind_addr *bp = &ep->base.bind_addr; |
338 | struct sctp_af *af; |
339 | unsigned short snum; |
340 | int ret = 0; |
341 | |
342 | /* Common sockaddr verification. */ |
343 | af = sctp_sockaddr_af(sp, addr, len); |
344 | if (!af) { |
345 | SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n", |
346 | sk, addr, len); |
347 | return -EINVAL; |
348 | } |
349 | |
350 | snum = ntohs(addr->v4.sin_port); |
351 | |
352 | SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ", |
353 | ", port: %d, new port: %d, len: %d)\n", |
354 | sk, |
355 | addr, |
356 | bp->port, snum, |
357 | len); |
358 | |
359 | /* PF specific bind() address verification. */ |
360 | if (!sp->pf->bind_verify(sp, addr)) |
361 | return -EADDRNOTAVAIL; |
362 | |
363 | /* We must either be unbound, or bind to the same port. |
364 | * It's OK to allow 0 ports if we are already bound. |
365 | * We'll just inhert an already bound port in this case |
366 | */ |
367 | if (bp->port) { |
368 | if (!snum) |
369 | snum = bp->port; |
370 | else if (snum != bp->port) { |
371 | SCTP_DEBUG_PRINTK("sctp_do_bind:" |
372 | " New port %d does not match existing port " |
373 | "%d.\n", snum, bp->port); |
374 | return -EINVAL; |
375 | } |
376 | } |
377 | |
378 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) |
379 | return -EACCES; |
380 | |
381 | /* See if the address matches any of the addresses we may have |
382 | * already bound before checking against other endpoints. |
383 | */ |
384 | if (sctp_bind_addr_match(bp, addr, sp)) |
385 | return -EINVAL; |
386 | |
387 | /* Make sure we are allowed to bind here. |
388 | * The function sctp_get_port_local() does duplicate address |
389 | * detection. |
390 | */ |
391 | addr->v4.sin_port = htons(snum); |
392 | if ((ret = sctp_get_port_local(sk, addr))) { |
393 | return -EADDRINUSE; |
394 | } |
395 | |
396 | /* Refresh ephemeral port. */ |
397 | if (!bp->port) |
398 | bp->port = inet_sk(sk)->inet_num; |
399 | |
400 | /* Add the address to the bind address list. |
401 | * Use GFP_ATOMIC since BHs will be disabled. |
402 | */ |
403 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
404 | |
405 | /* Copy back into socket for getsockname() use. */ |
406 | if (!ret) { |
407 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
408 | af->to_sk_saddr(addr, sk); |
409 | } |
410 | |
411 | return ret; |
412 | } |
413 | |
414 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks |
415 | * |
416 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
417 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
418 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
419 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
420 | * subsequent ASCONF. Note this restriction binds each side, so at any |
421 | * time two ASCONF may be in-transit on any given association (one sent |
422 | * from each endpoint). |
423 | */ |
424 | static int sctp_send_asconf(struct sctp_association *asoc, |
425 | struct sctp_chunk *chunk) |
426 | { |
427 | int retval = 0; |
428 | |
429 | /* If there is an outstanding ASCONF chunk, queue it for later |
430 | * transmission. |
431 | */ |
432 | if (asoc->addip_last_asconf) { |
433 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
434 | goto out; |
435 | } |
436 | |
437 | /* Hold the chunk until an ASCONF_ACK is received. */ |
438 | sctp_chunk_hold(chunk); |
439 | retval = sctp_primitive_ASCONF(asoc, chunk); |
440 | if (retval) |
441 | sctp_chunk_free(chunk); |
442 | else |
443 | asoc->addip_last_asconf = chunk; |
444 | |
445 | out: |
446 | return retval; |
447 | } |
448 | |
449 | /* Add a list of addresses as bind addresses to local endpoint or |
450 | * association. |
451 | * |
452 | * Basically run through each address specified in the addrs/addrcnt |
453 | * array/length pair, determine if it is IPv6 or IPv4 and call |
454 | * sctp_do_bind() on it. |
455 | * |
456 | * If any of them fails, then the operation will be reversed and the |
457 | * ones that were added will be removed. |
458 | * |
459 | * Only sctp_setsockopt_bindx() is supposed to call this function. |
460 | */ |
461 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
462 | { |
463 | int cnt; |
464 | int retval = 0; |
465 | void *addr_buf; |
466 | struct sockaddr *sa_addr; |
467 | struct sctp_af *af; |
468 | |
469 | SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n", |
470 | sk, addrs, addrcnt); |
471 | |
472 | addr_buf = addrs; |
473 | for (cnt = 0; cnt < addrcnt; cnt++) { |
474 | /* The list may contain either IPv4 or IPv6 address; |
475 | * determine the address length for walking thru the list. |
476 | */ |
477 | sa_addr = (struct sockaddr *)addr_buf; |
478 | af = sctp_get_af_specific(sa_addr->sa_family); |
479 | if (!af) { |
480 | retval = -EINVAL; |
481 | goto err_bindx_add; |
482 | } |
483 | |
484 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
485 | af->sockaddr_len); |
486 | |
487 | addr_buf += af->sockaddr_len; |
488 | |
489 | err_bindx_add: |
490 | if (retval < 0) { |
491 | /* Failed. Cleanup the ones that have been added */ |
492 | if (cnt > 0) |
493 | sctp_bindx_rem(sk, addrs, cnt); |
494 | return retval; |
495 | } |
496 | } |
497 | |
498 | return retval; |
499 | } |
500 | |
501 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the |
502 | * associations that are part of the endpoint indicating that a list of local |
503 | * addresses are added to the endpoint. |
504 | * |
505 | * If any of the addresses is already in the bind address list of the |
506 | * association, we do not send the chunk for that association. But it will not |
507 | * affect other associations. |
508 | * |
509 | * Only sctp_setsockopt_bindx() is supposed to call this function. |
510 | */ |
511 | static int sctp_send_asconf_add_ip(struct sock *sk, |
512 | struct sockaddr *addrs, |
513 | int addrcnt) |
514 | { |
515 | struct sctp_sock *sp; |
516 | struct sctp_endpoint *ep; |
517 | struct sctp_association *asoc; |
518 | struct sctp_bind_addr *bp; |
519 | struct sctp_chunk *chunk; |
520 | struct sctp_sockaddr_entry *laddr; |
521 | union sctp_addr *addr; |
522 | union sctp_addr saveaddr; |
523 | void *addr_buf; |
524 | struct sctp_af *af; |
525 | struct list_head *p; |
526 | int i; |
527 | int retval = 0; |
528 | |
529 | if (!sctp_addip_enable) |
530 | return retval; |
531 | |
532 | sp = sctp_sk(sk); |
533 | ep = sp->ep; |
534 | |
535 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", |
536 | __func__, sk, addrs, addrcnt); |
537 | |
538 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
539 | |
540 | if (!asoc->peer.asconf_capable) |
541 | continue; |
542 | |
543 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) |
544 | continue; |
545 | |
546 | if (!sctp_state(asoc, ESTABLISHED)) |
547 | continue; |
548 | |
549 | /* Check if any address in the packed array of addresses is |
550 | * in the bind address list of the association. If so, |
551 | * do not send the asconf chunk to its peer, but continue with |
552 | * other associations. |
553 | */ |
554 | addr_buf = addrs; |
555 | for (i = 0; i < addrcnt; i++) { |
556 | addr = (union sctp_addr *)addr_buf; |
557 | af = sctp_get_af_specific(addr->v4.sin_family); |
558 | if (!af) { |
559 | retval = -EINVAL; |
560 | goto out; |
561 | } |
562 | |
563 | if (sctp_assoc_lookup_laddr(asoc, addr)) |
564 | break; |
565 | |
566 | addr_buf += af->sockaddr_len; |
567 | } |
568 | if (i < addrcnt) |
569 | continue; |
570 | |
571 | /* Use the first valid address in bind addr list of |
572 | * association as Address Parameter of ASCONF CHUNK. |
573 | */ |
574 | bp = &asoc->base.bind_addr; |
575 | p = bp->address_list.next; |
576 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); |
577 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
578 | addrcnt, SCTP_PARAM_ADD_IP); |
579 | if (!chunk) { |
580 | retval = -ENOMEM; |
581 | goto out; |
582 | } |
583 | |
584 | retval = sctp_send_asconf(asoc, chunk); |
585 | if (retval) |
586 | goto out; |
587 | |
588 | /* Add the new addresses to the bind address list with |
589 | * use_as_src set to 0. |
590 | */ |
591 | addr_buf = addrs; |
592 | for (i = 0; i < addrcnt; i++) { |
593 | addr = (union sctp_addr *)addr_buf; |
594 | af = sctp_get_af_specific(addr->v4.sin_family); |
595 | memcpy(&saveaddr, addr, af->sockaddr_len); |
596 | retval = sctp_add_bind_addr(bp, &saveaddr, |
597 | SCTP_ADDR_NEW, GFP_ATOMIC); |
598 | addr_buf += af->sockaddr_len; |
599 | } |
600 | } |
601 | |
602 | out: |
603 | return retval; |
604 | } |
605 | |
606 | /* Remove a list of addresses from bind addresses list. Do not remove the |
607 | * last address. |
608 | * |
609 | * Basically run through each address specified in the addrs/addrcnt |
610 | * array/length pair, determine if it is IPv6 or IPv4 and call |
611 | * sctp_del_bind() on it. |
612 | * |
613 | * If any of them fails, then the operation will be reversed and the |
614 | * ones that were removed will be added back. |
615 | * |
616 | * At least one address has to be left; if only one address is |
617 | * available, the operation will return -EBUSY. |
618 | * |
619 | * Only sctp_setsockopt_bindx() is supposed to call this function. |
620 | */ |
621 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
622 | { |
623 | struct sctp_sock *sp = sctp_sk(sk); |
624 | struct sctp_endpoint *ep = sp->ep; |
625 | int cnt; |
626 | struct sctp_bind_addr *bp = &ep->base.bind_addr; |
627 | int retval = 0; |
628 | void *addr_buf; |
629 | union sctp_addr *sa_addr; |
630 | struct sctp_af *af; |
631 | |
632 | SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n", |
633 | sk, addrs, addrcnt); |
634 | |
635 | addr_buf = addrs; |
636 | for (cnt = 0; cnt < addrcnt; cnt++) { |
637 | /* If the bind address list is empty or if there is only one |
638 | * bind address, there is nothing more to be removed (we need |
639 | * at least one address here). |
640 | */ |
641 | if (list_empty(&bp->address_list) || |
642 | (sctp_list_single_entry(&bp->address_list))) { |
643 | retval = -EBUSY; |
644 | goto err_bindx_rem; |
645 | } |
646 | |
647 | sa_addr = (union sctp_addr *)addr_buf; |
648 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
649 | if (!af) { |
650 | retval = -EINVAL; |
651 | goto err_bindx_rem; |
652 | } |
653 | |
654 | if (!af->addr_valid(sa_addr, sp, NULL)) { |
655 | retval = -EADDRNOTAVAIL; |
656 | goto err_bindx_rem; |
657 | } |
658 | |
659 | if (sa_addr->v4.sin_port != htons(bp->port)) { |
660 | retval = -EINVAL; |
661 | goto err_bindx_rem; |
662 | } |
663 | |
664 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
665 | * sk->sk_rcv_addr are currently set to one of the addresses to |
666 | * be removed. This is something which needs to be looked into |
667 | * when we are fixing the outstanding issues with multi-homing |
668 | * socket routing and failover schemes. Refer to comments in |
669 | * sctp_do_bind(). -daisy |
670 | */ |
671 | retval = sctp_del_bind_addr(bp, sa_addr); |
672 | |
673 | addr_buf += af->sockaddr_len; |
674 | err_bindx_rem: |
675 | if (retval < 0) { |
676 | /* Failed. Add the ones that has been removed back */ |
677 | if (cnt > 0) |
678 | sctp_bindx_add(sk, addrs, cnt); |
679 | return retval; |
680 | } |
681 | } |
682 | |
683 | return retval; |
684 | } |
685 | |
686 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of |
687 | * the associations that are part of the endpoint indicating that a list of |
688 | * local addresses are removed from the endpoint. |
689 | * |
690 | * If any of the addresses is already in the bind address list of the |
691 | * association, we do not send the chunk for that association. But it will not |
692 | * affect other associations. |
693 | * |
694 | * Only sctp_setsockopt_bindx() is supposed to call this function. |
695 | */ |
696 | static int sctp_send_asconf_del_ip(struct sock *sk, |
697 | struct sockaddr *addrs, |
698 | int addrcnt) |
699 | { |
700 | struct sctp_sock *sp; |
701 | struct sctp_endpoint *ep; |
702 | struct sctp_association *asoc; |
703 | struct sctp_transport *transport; |
704 | struct sctp_bind_addr *bp; |
705 | struct sctp_chunk *chunk; |
706 | union sctp_addr *laddr; |
707 | void *addr_buf; |
708 | struct sctp_af *af; |
709 | struct sctp_sockaddr_entry *saddr; |
710 | int i; |
711 | int retval = 0; |
712 | |
713 | if (!sctp_addip_enable) |
714 | return retval; |
715 | |
716 | sp = sctp_sk(sk); |
717 | ep = sp->ep; |
718 | |
719 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", |
720 | __func__, sk, addrs, addrcnt); |
721 | |
722 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
723 | |
724 | if (!asoc->peer.asconf_capable) |
725 | continue; |
726 | |
727 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) |
728 | continue; |
729 | |
730 | if (!sctp_state(asoc, ESTABLISHED)) |
731 | continue; |
732 | |
733 | /* Check if any address in the packed array of addresses is |
734 | * not present in the bind address list of the association. |
735 | * If so, do not send the asconf chunk to its peer, but |
736 | * continue with other associations. |
737 | */ |
738 | addr_buf = addrs; |
739 | for (i = 0; i < addrcnt; i++) { |
740 | laddr = (union sctp_addr *)addr_buf; |
741 | af = sctp_get_af_specific(laddr->v4.sin_family); |
742 | if (!af) { |
743 | retval = -EINVAL; |
744 | goto out; |
745 | } |
746 | |
747 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) |
748 | break; |
749 | |
750 | addr_buf += af->sockaddr_len; |
751 | } |
752 | if (i < addrcnt) |
753 | continue; |
754 | |
755 | /* Find one address in the association's bind address list |
756 | * that is not in the packed array of addresses. This is to |
757 | * make sure that we do not delete all the addresses in the |
758 | * association. |
759 | */ |
760 | bp = &asoc->base.bind_addr; |
761 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, |
762 | addrcnt, sp); |
763 | if (!laddr) |
764 | continue; |
765 | |
766 | /* We do not need RCU protection throughout this loop |
767 | * because this is done under a socket lock from the |
768 | * setsockopt call. |
769 | */ |
770 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
771 | SCTP_PARAM_DEL_IP); |
772 | if (!chunk) { |
773 | retval = -ENOMEM; |
774 | goto out; |
775 | } |
776 | |
777 | /* Reset use_as_src flag for the addresses in the bind address |
778 | * list that are to be deleted. |
779 | */ |
780 | addr_buf = addrs; |
781 | for (i = 0; i < addrcnt; i++) { |
782 | laddr = (union sctp_addr *)addr_buf; |
783 | af = sctp_get_af_specific(laddr->v4.sin_family); |
784 | list_for_each_entry(saddr, &bp->address_list, list) { |
785 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
786 | saddr->state = SCTP_ADDR_DEL; |
787 | } |
788 | addr_buf += af->sockaddr_len; |
789 | } |
790 | |
791 | /* Update the route and saddr entries for all the transports |
792 | * as some of the addresses in the bind address list are |
793 | * about to be deleted and cannot be used as source addresses. |
794 | */ |
795 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
796 | transports) { |
797 | dst_release(transport->dst); |
798 | sctp_transport_route(transport, NULL, |
799 | sctp_sk(asoc->base.sk)); |
800 | } |
801 | |
802 | retval = sctp_send_asconf(asoc, chunk); |
803 | } |
804 | out: |
805 | return retval; |
806 | } |
807 | |
808 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
809 | * |
810 | * API 8.1 |
811 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, |
812 | * int flags); |
813 | * |
814 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. |
815 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 |
816 | * or IPv6 addresses. |
817 | * |
818 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see |
819 | * Section 3.1.2 for this usage. |
820 | * |
821 | * addrs is a pointer to an array of one or more socket addresses. Each |
822 | * address is contained in its appropriate structure (i.e. struct |
823 | * sockaddr_in or struct sockaddr_in6) the family of the address type |
824 | * must be used to distinguish the address length (note that this |
825 | * representation is termed a "packed array" of addresses). The caller |
826 | * specifies the number of addresses in the array with addrcnt. |
827 | * |
828 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns |
829 | * -1, and sets errno to the appropriate error code. |
830 | * |
831 | * For SCTP, the port given in each socket address must be the same, or |
832 | * sctp_bindx() will fail, setting errno to EINVAL. |
833 | * |
834 | * The flags parameter is formed from the bitwise OR of zero or more of |
835 | * the following currently defined flags: |
836 | * |
837 | * SCTP_BINDX_ADD_ADDR |
838 | * |
839 | * SCTP_BINDX_REM_ADDR |
840 | * |
841 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the |
842 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given |
843 | * addresses from the association. The two flags are mutually exclusive; |
844 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may |
845 | * not remove all addresses from an association; sctp_bindx() will |
846 | * reject such an attempt with EINVAL. |
847 | * |
848 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate |
849 | * additional addresses with an endpoint after calling bind(). Or use |
850 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening |
851 | * socket is associated with so that no new association accepted will be |
852 | * associated with those addresses. If the endpoint supports dynamic |
853 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a |
854 | * endpoint to send the appropriate message to the peer to change the |
855 | * peers address lists. |
856 | * |
857 | * Adding and removing addresses from a connected association is |
858 | * optional functionality. Implementations that do not support this |
859 | * functionality should return EOPNOTSUPP. |
860 | * |
861 | * Basically do nothing but copying the addresses from user to kernel |
862 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. |
863 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
864 | * from userspace. |
865 | * |
866 | * We don't use copy_from_user() for optimization: we first do the |
867 | * sanity checks (buffer size -fast- and access check-healthy |
868 | * pointer); if all of those succeed, then we can alloc the memory |
869 | * (expensive operation) needed to copy the data to kernel. Then we do |
870 | * the copying without checking the user space area |
871 | * (__copy_from_user()). |
872 | * |
873 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does |
874 | * it. |
875 | * |
876 | * sk The sk of the socket |
877 | * addrs The pointer to the addresses in user land |
878 | * addrssize Size of the addrs buffer |
879 | * op Operation to perform (add or remove, see the flags of |
880 | * sctp_bindx) |
881 | * |
882 | * Returns 0 if ok, <0 errno code on error. |
883 | */ |
884 | SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk, |
885 | struct sockaddr __user *addrs, |
886 | int addrs_size, int op) |
887 | { |
888 | struct sockaddr *kaddrs; |
889 | int err; |
890 | int addrcnt = 0; |
891 | int walk_size = 0; |
892 | struct sockaddr *sa_addr; |
893 | void *addr_buf; |
894 | struct sctp_af *af; |
895 | |
896 | SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p" |
897 | " addrs_size %d opt %d\n", sk, addrs, addrs_size, op); |
898 | |
899 | if (unlikely(addrs_size <= 0)) |
900 | return -EINVAL; |
901 | |
902 | /* Check the user passed a healthy pointer. */ |
903 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) |
904 | return -EFAULT; |
905 | |
906 | /* Alloc space for the address array in kernel memory. */ |
907 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
908 | if (unlikely(!kaddrs)) |
909 | return -ENOMEM; |
910 | |
911 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { |
912 | kfree(kaddrs); |
913 | return -EFAULT; |
914 | } |
915 | |
916 | /* Walk through the addrs buffer and count the number of addresses. */ |
917 | addr_buf = kaddrs; |
918 | while (walk_size < addrs_size) { |
919 | sa_addr = (struct sockaddr *)addr_buf; |
920 | af = sctp_get_af_specific(sa_addr->sa_family); |
921 | |
922 | /* If the address family is not supported or if this address |
923 | * causes the address buffer to overflow return EINVAL. |
924 | */ |
925 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
926 | kfree(kaddrs); |
927 | return -EINVAL; |
928 | } |
929 | addrcnt++; |
930 | addr_buf += af->sockaddr_len; |
931 | walk_size += af->sockaddr_len; |
932 | } |
933 | |
934 | /* Do the work. */ |
935 | switch (op) { |
936 | case SCTP_BINDX_ADD_ADDR: |
937 | err = sctp_bindx_add(sk, kaddrs, addrcnt); |
938 | if (err) |
939 | goto out; |
940 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); |
941 | break; |
942 | |
943 | case SCTP_BINDX_REM_ADDR: |
944 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); |
945 | if (err) |
946 | goto out; |
947 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); |
948 | break; |
949 | |
950 | default: |
951 | err = -EINVAL; |
952 | break; |
953 | } |
954 | |
955 | out: |
956 | kfree(kaddrs); |
957 | |
958 | return err; |
959 | } |
960 | |
961 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
962 | * |
963 | * Common routine for handling connect() and sctp_connectx(). |
964 | * Connect will come in with just a single address. |
965 | */ |
966 | static int __sctp_connect(struct sock* sk, |
967 | struct sockaddr *kaddrs, |
968 | int addrs_size, |
969 | sctp_assoc_t *assoc_id) |
970 | { |
971 | struct sctp_sock *sp; |
972 | struct sctp_endpoint *ep; |
973 | struct sctp_association *asoc = NULL; |
974 | struct sctp_association *asoc2; |
975 | struct sctp_transport *transport; |
976 | union sctp_addr to; |
977 | struct sctp_af *af; |
978 | sctp_scope_t scope; |
979 | long timeo; |
980 | int err = 0; |
981 | int addrcnt = 0; |
982 | int walk_size = 0; |
983 | union sctp_addr *sa_addr = NULL; |
984 | void *addr_buf; |
985 | unsigned short port; |
986 | unsigned int f_flags = 0; |
987 | |
988 | sp = sctp_sk(sk); |
989 | ep = sp->ep; |
990 | |
991 | /* connect() cannot be done on a socket that is already in ESTABLISHED |
992 | * state - UDP-style peeled off socket or a TCP-style socket that |
993 | * is already connected. |
994 | * It cannot be done even on a TCP-style listening socket. |
995 | */ |
996 | if (sctp_sstate(sk, ESTABLISHED) || |
997 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { |
998 | err = -EISCONN; |
999 | goto out_free; |
1000 | } |
1001 | |
1002 | /* Walk through the addrs buffer and count the number of addresses. */ |
1003 | addr_buf = kaddrs; |
1004 | while (walk_size < addrs_size) { |
1005 | sa_addr = (union sctp_addr *)addr_buf; |
1006 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1007 | port = ntohs(sa_addr->v4.sin_port); |
1008 | |
1009 | /* If the address family is not supported or if this address |
1010 | * causes the address buffer to overflow return EINVAL. |
1011 | */ |
1012 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
1013 | err = -EINVAL; |
1014 | goto out_free; |
1015 | } |
1016 | |
1017 | /* Save current address so we can work with it */ |
1018 | memcpy(&to, sa_addr, af->sockaddr_len); |
1019 | |
1020 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); |
1021 | if (err) |
1022 | goto out_free; |
1023 | |
1024 | /* Make sure the destination port is correctly set |
1025 | * in all addresses. |
1026 | */ |
1027 | if (asoc && asoc->peer.port && asoc->peer.port != port) |
1028 | goto out_free; |
1029 | |
1030 | |
1031 | /* Check if there already is a matching association on the |
1032 | * endpoint (other than the one created here). |
1033 | */ |
1034 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1035 | if (asoc2 && asoc2 != asoc) { |
1036 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) |
1037 | err = -EISCONN; |
1038 | else |
1039 | err = -EALREADY; |
1040 | goto out_free; |
1041 | } |
1042 | |
1043 | /* If we could not find a matching association on the endpoint, |
1044 | * make sure that there is no peeled-off association matching |
1045 | * the peer address even on another socket. |
1046 | */ |
1047 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
1048 | err = -EADDRNOTAVAIL; |
1049 | goto out_free; |
1050 | } |
1051 | |
1052 | if (!asoc) { |
1053 | /* If a bind() or sctp_bindx() is not called prior to |
1054 | * an sctp_connectx() call, the system picks an |
1055 | * ephemeral port and will choose an address set |
1056 | * equivalent to binding with a wildcard address. |
1057 | */ |
1058 | if (!ep->base.bind_addr.port) { |
1059 | if (sctp_autobind(sk)) { |
1060 | err = -EAGAIN; |
1061 | goto out_free; |
1062 | } |
1063 | } else { |
1064 | /* |
1065 | * If an unprivileged user inherits a 1-many |
1066 | * style socket with open associations on a |
1067 | * privileged port, it MAY be permitted to |
1068 | * accept new associations, but it SHOULD NOT |
1069 | * be permitted to open new associations. |
1070 | */ |
1071 | if (ep->base.bind_addr.port < PROT_SOCK && |
1072 | !capable(CAP_NET_BIND_SERVICE)) { |
1073 | err = -EACCES; |
1074 | goto out_free; |
1075 | } |
1076 | } |
1077 | |
1078 | scope = sctp_scope(&to); |
1079 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1080 | if (!asoc) { |
1081 | err = -ENOMEM; |
1082 | goto out_free; |
1083 | } |
1084 | |
1085 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, |
1086 | GFP_KERNEL); |
1087 | if (err < 0) { |
1088 | goto out_free; |
1089 | } |
1090 | |
1091 | } |
1092 | |
1093 | /* Prime the peer's transport structures. */ |
1094 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
1095 | SCTP_UNKNOWN); |
1096 | if (!transport) { |
1097 | err = -ENOMEM; |
1098 | goto out_free; |
1099 | } |
1100 | |
1101 | addrcnt++; |
1102 | addr_buf += af->sockaddr_len; |
1103 | walk_size += af->sockaddr_len; |
1104 | } |
1105 | |
1106 | /* In case the user of sctp_connectx() wants an association |
1107 | * id back, assign one now. |
1108 | */ |
1109 | if (assoc_id) { |
1110 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); |
1111 | if (err < 0) |
1112 | goto out_free; |
1113 | } |
1114 | |
1115 | err = sctp_primitive_ASSOCIATE(asoc, NULL); |
1116 | if (err < 0) { |
1117 | goto out_free; |
1118 | } |
1119 | |
1120 | /* Initialize sk's dport and daddr for getpeername() */ |
1121 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
1122 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1123 | af->to_sk_daddr(sa_addr, sk); |
1124 | sk->sk_err = 0; |
1125 | |
1126 | /* in-kernel sockets don't generally have a file allocated to them |
1127 | * if all they do is call sock_create_kern(). |
1128 | */ |
1129 | if (sk->sk_socket->file) |
1130 | f_flags = sk->sk_socket->file->f_flags; |
1131 | |
1132 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); |
1133 | |
1134 | err = sctp_wait_for_connect(asoc, &timeo); |
1135 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
1136 | *assoc_id = asoc->assoc_id; |
1137 | |
1138 | /* Don't free association on exit. */ |
1139 | asoc = NULL; |
1140 | |
1141 | out_free: |
1142 | |
1143 | SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p" |
1144 | " kaddrs: %p err: %d\n", |
1145 | asoc, kaddrs, err); |
1146 | if (asoc) |
1147 | sctp_association_free(asoc); |
1148 | return err; |
1149 | } |
1150 | |
1151 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() |
1152 | * |
1153 | * API 8.9 |
1154 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1155 | * sctp_assoc_t *asoc); |
1156 | * |
1157 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. |
1158 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 |
1159 | * or IPv6 addresses. |
1160 | * |
1161 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see |
1162 | * Section 3.1.2 for this usage. |
1163 | * |
1164 | * addrs is a pointer to an array of one or more socket addresses. Each |
1165 | * address is contained in its appropriate structure (i.e. struct |
1166 | * sockaddr_in or struct sockaddr_in6) the family of the address type |
1167 | * must be used to distengish the address length (note that this |
1168 | * representation is termed a "packed array" of addresses). The caller |
1169 | * specifies the number of addresses in the array with addrcnt. |
1170 | * |
1171 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1172 | * the association id of the new association. On failure, sctp_connectx() |
1173 | * returns -1, and sets errno to the appropriate error code. The assoc_id |
1174 | * is not touched by the kernel. |
1175 | * |
1176 | * For SCTP, the port given in each socket address must be the same, or |
1177 | * sctp_connectx() will fail, setting errno to EINVAL. |
1178 | * |
1179 | * An application can use sctp_connectx to initiate an association with |
1180 | * an endpoint that is multi-homed. Much like sctp_bindx() this call |
1181 | * allows a caller to specify multiple addresses at which a peer can be |
1182 | * reached. The way the SCTP stack uses the list of addresses to set up |
1183 | * the association is implementation dependant. This function only |
1184 | * specifies that the stack will try to make use of all the addresses in |
1185 | * the list when needed. |
1186 | * |
1187 | * Note that the list of addresses passed in is only used for setting up |
1188 | * the association. It does not necessarily equal the set of addresses |
1189 | * the peer uses for the resulting association. If the caller wants to |
1190 | * find out the set of peer addresses, it must use sctp_getpaddrs() to |
1191 | * retrieve them after the association has been set up. |
1192 | * |
1193 | * Basically do nothing but copying the addresses from user to kernel |
1194 | * land and invoking either sctp_connectx(). This is used for tunneling |
1195 | * the sctp_connectx() request through sctp_setsockopt() from userspace. |
1196 | * |
1197 | * We don't use copy_from_user() for optimization: we first do the |
1198 | * sanity checks (buffer size -fast- and access check-healthy |
1199 | * pointer); if all of those succeed, then we can alloc the memory |
1200 | * (expensive operation) needed to copy the data to kernel. Then we do |
1201 | * the copying without checking the user space area |
1202 | * (__copy_from_user()). |
1203 | * |
1204 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does |
1205 | * it. |
1206 | * |
1207 | * sk The sk of the socket |
1208 | * addrs The pointer to the addresses in user land |
1209 | * addrssize Size of the addrs buffer |
1210 | * |
1211 | * Returns >=0 if ok, <0 errno code on error. |
1212 | */ |
1213 | SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk, |
1214 | struct sockaddr __user *addrs, |
1215 | int addrs_size, |
1216 | sctp_assoc_t *assoc_id) |
1217 | { |
1218 | int err = 0; |
1219 | struct sockaddr *kaddrs; |
1220 | |
1221 | SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n", |
1222 | __func__, sk, addrs, addrs_size); |
1223 | |
1224 | if (unlikely(addrs_size <= 0)) |
1225 | return -EINVAL; |
1226 | |
1227 | /* Check the user passed a healthy pointer. */ |
1228 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) |
1229 | return -EFAULT; |
1230 | |
1231 | /* Alloc space for the address array in kernel memory. */ |
1232 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1233 | if (unlikely(!kaddrs)) |
1234 | return -ENOMEM; |
1235 | |
1236 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { |
1237 | err = -EFAULT; |
1238 | } else { |
1239 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
1240 | } |
1241 | |
1242 | kfree(kaddrs); |
1243 | |
1244 | return err; |
1245 | } |
1246 | |
1247 | /* |
1248 | * This is an older interface. It's kept for backward compatibility |
1249 | * to the option that doesn't provide association id. |
1250 | */ |
1251 | SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk, |
1252 | struct sockaddr __user *addrs, |
1253 | int addrs_size) |
1254 | { |
1255 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); |
1256 | } |
1257 | |
1258 | /* |
1259 | * New interface for the API. The since the API is done with a socket |
1260 | * option, to make it simple we feed back the association id is as a return |
1261 | * indication to the call. Error is always negative and association id is |
1262 | * always positive. |
1263 | */ |
1264 | SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk, |
1265 | struct sockaddr __user *addrs, |
1266 | int addrs_size) |
1267 | { |
1268 | sctp_assoc_t assoc_id = 0; |
1269 | int err = 0; |
1270 | |
1271 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); |
1272 | |
1273 | if (err) |
1274 | return err; |
1275 | else |
1276 | return assoc_id; |
1277 | } |
1278 | |
1279 | /* |
1280 | * New (hopefully final) interface for the API. |
1281 | * We use the sctp_getaddrs_old structure so that use-space library |
1282 | * can avoid any unnecessary allocations. The only defferent part |
1283 | * is that we store the actual length of the address buffer into the |
1284 | * addrs_num structure member. That way we can re-use the existing |
1285 | * code. |
1286 | */ |
1287 | SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len, |
1288 | char __user *optval, |
1289 | int __user *optlen) |
1290 | { |
1291 | struct sctp_getaddrs_old param; |
1292 | sctp_assoc_t assoc_id = 0; |
1293 | int err = 0; |
1294 | |
1295 | if (len < sizeof(param)) |
1296 | return -EINVAL; |
1297 | |
1298 | if (copy_from_user(¶m, optval, sizeof(param))) |
1299 | return -EFAULT; |
1300 | |
1301 | err = __sctp_setsockopt_connectx(sk, |
1302 | (struct sockaddr __user *)param.addrs, |
1303 | param.addr_num, &assoc_id); |
1304 | |
1305 | if (err == 0 || err == -EINPROGRESS) { |
1306 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) |
1307 | return -EFAULT; |
1308 | if (put_user(sizeof(assoc_id), optlen)) |
1309 | return -EFAULT; |
1310 | } |
1311 | |
1312 | return err; |
1313 | } |
1314 | |
1315 | /* API 3.1.4 close() - UDP Style Syntax |
1316 | * Applications use close() to perform graceful shutdown (as described in |
1317 | * Section 10.1 of [SCTP]) on ALL the associations currently represented |
1318 | * by a UDP-style socket. |
1319 | * |
1320 | * The syntax is |
1321 | * |
1322 | * ret = close(int sd); |
1323 | * |
1324 | * sd - the socket descriptor of the associations to be closed. |
1325 | * |
1326 | * To gracefully shutdown a specific association represented by the |
1327 | * UDP-style socket, an application should use the sendmsg() call, |
1328 | * passing no user data, but including the appropriate flag in the |
1329 | * ancillary data (see Section xxxx). |
1330 | * |
1331 | * If sd in the close() call is a branched-off socket representing only |
1332 | * one association, the shutdown is performed on that association only. |
1333 | * |
1334 | * 4.1.6 close() - TCP Style Syntax |
1335 | * |
1336 | * Applications use close() to gracefully close down an association. |
1337 | * |
1338 | * The syntax is: |
1339 | * |
1340 | * int close(int sd); |
1341 | * |
1342 | * sd - the socket descriptor of the association to be closed. |
1343 | * |
1344 | * After an application calls close() on a socket descriptor, no further |
1345 | * socket operations will succeed on that descriptor. |
1346 | * |
1347 | * API 7.1.4 SO_LINGER |
1348 | * |
1349 | * An application using the TCP-style socket can use this option to |
1350 | * perform the SCTP ABORT primitive. The linger option structure is: |
1351 | * |
1352 | * struct linger { |
1353 | * int l_onoff; // option on/off |
1354 | * int l_linger; // linger time |
1355 | * }; |
1356 | * |
1357 | * To enable the option, set l_onoff to 1. If the l_linger value is set |
1358 | * to 0, calling close() is the same as the ABORT primitive. If the |
1359 | * value is set to a negative value, the setsockopt() call will return |
1360 | * an error. If the value is set to a positive value linger_time, the |
1361 | * close() can be blocked for at most linger_time ms. If the graceful |
1362 | * shutdown phase does not finish during this period, close() will |
1363 | * return but the graceful shutdown phase continues in the system. |
1364 | */ |
1365 | SCTP_STATIC void sctp_close(struct sock *sk, long timeout) |
1366 | { |
1367 | struct sctp_endpoint *ep; |
1368 | struct sctp_association *asoc; |
1369 | struct list_head *pos, *temp; |
1370 | |
1371 | SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout); |
1372 | |
1373 | sctp_lock_sock(sk); |
1374 | sk->sk_shutdown = SHUTDOWN_MASK; |
1375 | sk->sk_state = SCTP_SS_CLOSING; |
1376 | |
1377 | ep = sctp_sk(sk)->ep; |
1378 | |
1379 | /* Walk all associations on an endpoint. */ |
1380 | list_for_each_safe(pos, temp, &ep->asocs) { |
1381 | asoc = list_entry(pos, struct sctp_association, asocs); |
1382 | |
1383 | if (sctp_style(sk, TCP)) { |
1384 | /* A closed association can still be in the list if |
1385 | * it belongs to a TCP-style listening socket that is |
1386 | * not yet accepted. If so, free it. If not, send an |
1387 | * ABORT or SHUTDOWN based on the linger options. |
1388 | */ |
1389 | if (sctp_state(asoc, CLOSED)) { |
1390 | sctp_unhash_established(asoc); |
1391 | sctp_association_free(asoc); |
1392 | continue; |
1393 | } |
1394 | } |
1395 | |
1396 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
1397 | struct sctp_chunk *chunk; |
1398 | |
1399 | chunk = sctp_make_abort_user(asoc, NULL, 0); |
1400 | if (chunk) |
1401 | sctp_primitive_ABORT(asoc, chunk); |
1402 | } else |
1403 | sctp_primitive_SHUTDOWN(asoc, NULL); |
1404 | } |
1405 | |
1406 | /* Clean up any skbs sitting on the receive queue. */ |
1407 | sctp_queue_purge_ulpevents(&sk->sk_receive_queue); |
1408 | sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); |
1409 | |
1410 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1411 | if (sctp_style(sk, TCP) && timeout) |
1412 | sctp_wait_for_close(sk, timeout); |
1413 | |
1414 | /* This will run the backlog queue. */ |
1415 | sctp_release_sock(sk); |
1416 | |
1417 | /* Supposedly, no process has access to the socket, but |
1418 | * the net layers still may. |
1419 | */ |
1420 | sctp_local_bh_disable(); |
1421 | sctp_bh_lock_sock(sk); |
1422 | |
1423 | /* Hold the sock, since sk_common_release() will put sock_put() |
1424 | * and we have just a little more cleanup. |
1425 | */ |
1426 | sock_hold(sk); |
1427 | sk_common_release(sk); |
1428 | |
1429 | sctp_bh_unlock_sock(sk); |
1430 | sctp_local_bh_enable(); |
1431 | |
1432 | sock_put(sk); |
1433 | |
1434 | SCTP_DBG_OBJCNT_DEC(sock); |
1435 | } |
1436 | |
1437 | /* Handle EPIPE error. */ |
1438 | static int sctp_error(struct sock *sk, int flags, int err) |
1439 | { |
1440 | if (err == -EPIPE) |
1441 | err = sock_error(sk) ? : -EPIPE; |
1442 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) |
1443 | send_sig(SIGPIPE, current, 0); |
1444 | return err; |
1445 | } |
1446 | |
1447 | /* API 3.1.3 sendmsg() - UDP Style Syntax |
1448 | * |
1449 | * An application uses sendmsg() and recvmsg() calls to transmit data to |
1450 | * and receive data from its peer. |
1451 | * |
1452 | * ssize_t sendmsg(int socket, const struct msghdr *message, |
1453 | * int flags); |
1454 | * |
1455 | * socket - the socket descriptor of the endpoint. |
1456 | * message - pointer to the msghdr structure which contains a single |
1457 | * user message and possibly some ancillary data. |
1458 | * |
1459 | * See Section 5 for complete description of the data |
1460 | * structures. |
1461 | * |
1462 | * flags - flags sent or received with the user message, see Section |
1463 | * 5 for complete description of the flags. |
1464 | * |
1465 | * Note: This function could use a rewrite especially when explicit |
1466 | * connect support comes in. |
1467 | */ |
1468 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ |
1469 | |
1470 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); |
1471 | |
1472 | SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, |
1473 | struct msghdr *msg, size_t msg_len) |
1474 | { |
1475 | struct sctp_sock *sp; |
1476 | struct sctp_endpoint *ep; |
1477 | struct sctp_association *new_asoc=NULL, *asoc=NULL; |
1478 | struct sctp_transport *transport, *chunk_tp; |
1479 | struct sctp_chunk *chunk; |
1480 | union sctp_addr to; |
1481 | struct sockaddr *msg_name = NULL; |
1482 | struct sctp_sndrcvinfo default_sinfo = { 0 }; |
1483 | struct sctp_sndrcvinfo *sinfo; |
1484 | struct sctp_initmsg *sinit; |
1485 | sctp_assoc_t associd = 0; |
1486 | sctp_cmsgs_t cmsgs = { NULL }; |
1487 | int err; |
1488 | sctp_scope_t scope; |
1489 | long timeo; |
1490 | __u16 sinfo_flags = 0; |
1491 | struct sctp_datamsg *datamsg; |
1492 | int msg_flags = msg->msg_flags; |
1493 | |
1494 | SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n", |
1495 | sk, msg, msg_len); |
1496 | |
1497 | err = 0; |
1498 | sp = sctp_sk(sk); |
1499 | ep = sp->ep; |
1500 | |
1501 | SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep); |
1502 | |
1503 | /* We cannot send a message over a TCP-style listening socket. */ |
1504 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { |
1505 | err = -EPIPE; |
1506 | goto out_nounlock; |
1507 | } |
1508 | |
1509 | /* Parse out the SCTP CMSGs. */ |
1510 | err = sctp_msghdr_parse(msg, &cmsgs); |
1511 | |
1512 | if (err) { |
1513 | SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err); |
1514 | goto out_nounlock; |
1515 | } |
1516 | |
1517 | /* Fetch the destination address for this packet. This |
1518 | * address only selects the association--it is not necessarily |
1519 | * the address we will send to. |
1520 | * For a peeled-off socket, msg_name is ignored. |
1521 | */ |
1522 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { |
1523 | int msg_namelen = msg->msg_namelen; |
1524 | |
1525 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, |
1526 | msg_namelen); |
1527 | if (err) |
1528 | return err; |
1529 | |
1530 | if (msg_namelen > sizeof(to)) |
1531 | msg_namelen = sizeof(to); |
1532 | memcpy(&to, msg->msg_name, msg_namelen); |
1533 | msg_name = msg->msg_name; |
1534 | } |
1535 | |
1536 | sinfo = cmsgs.info; |
1537 | sinit = cmsgs.init; |
1538 | |
1539 | /* Did the user specify SNDRCVINFO? */ |
1540 | if (sinfo) { |
1541 | sinfo_flags = sinfo->sinfo_flags; |
1542 | associd = sinfo->sinfo_assoc_id; |
1543 | } |
1544 | |
1545 | SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n", |
1546 | msg_len, sinfo_flags); |
1547 | |
1548 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1549 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { |
1550 | err = -EINVAL; |
1551 | goto out_nounlock; |
1552 | } |
1553 | |
1554 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1555 | * length messages when SCTP_EOF|SCTP_ABORT is not set. |
1556 | * If SCTP_ABORT is set, the message length could be non zero with |
1557 | * the msg_iov set to the user abort reason. |
1558 | */ |
1559 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1560 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { |
1561 | err = -EINVAL; |
1562 | goto out_nounlock; |
1563 | } |
1564 | |
1565 | /* If SCTP_ADDR_OVER is set, there must be an address |
1566 | * specified in msg_name. |
1567 | */ |
1568 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1569 | err = -EINVAL; |
1570 | goto out_nounlock; |
1571 | } |
1572 | |
1573 | transport = NULL; |
1574 | |
1575 | SCTP_DEBUG_PRINTK("About to look up association.\n"); |
1576 | |
1577 | sctp_lock_sock(sk); |
1578 | |
1579 | /* If a msg_name has been specified, assume this is to be used. */ |
1580 | if (msg_name) { |
1581 | /* Look for a matching association on the endpoint. */ |
1582 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1583 | if (!asoc) { |
1584 | /* If we could not find a matching association on the |
1585 | * endpoint, make sure that it is not a TCP-style |
1586 | * socket that already has an association or there is |
1587 | * no peeled-off association on another socket. |
1588 | */ |
1589 | if ((sctp_style(sk, TCP) && |
1590 | sctp_sstate(sk, ESTABLISHED)) || |
1591 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1592 | err = -EADDRNOTAVAIL; |
1593 | goto out_unlock; |
1594 | } |
1595 | } |
1596 | } else { |
1597 | asoc = sctp_id2assoc(sk, associd); |
1598 | if (!asoc) { |
1599 | err = -EPIPE; |
1600 | goto out_unlock; |
1601 | } |
1602 | } |
1603 | |
1604 | if (asoc) { |
1605 | SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc); |
1606 | |
1607 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED |
1608 | * socket that has an association in CLOSED state. This can |
1609 | * happen when an accepted socket has an association that is |
1610 | * already CLOSED. |
1611 | */ |
1612 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { |
1613 | err = -EPIPE; |
1614 | goto out_unlock; |
1615 | } |
1616 | |
1617 | if (sinfo_flags & SCTP_EOF) { |
1618 | SCTP_DEBUG_PRINTK("Shutting down association: %p\n", |
1619 | asoc); |
1620 | sctp_primitive_SHUTDOWN(asoc, NULL); |
1621 | err = 0; |
1622 | goto out_unlock; |
1623 | } |
1624 | if (sinfo_flags & SCTP_ABORT) { |
1625 | |
1626 | chunk = sctp_make_abort_user(asoc, msg, msg_len); |
1627 | if (!chunk) { |
1628 | err = -ENOMEM; |
1629 | goto out_unlock; |
1630 | } |
1631 | |
1632 | SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc); |
1633 | sctp_primitive_ABORT(asoc, chunk); |
1634 | err = 0; |
1635 | goto out_unlock; |
1636 | } |
1637 | } |
1638 | |
1639 | /* Do we need to create the association? */ |
1640 | if (!asoc) { |
1641 | SCTP_DEBUG_PRINTK("There is no association yet.\n"); |
1642 | |
1643 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1644 | err = -EINVAL; |
1645 | goto out_unlock; |
1646 | } |
1647 | |
1648 | /* Check for invalid stream against the stream counts, |
1649 | * either the default or the user specified stream counts. |
1650 | */ |
1651 | if (sinfo) { |
1652 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { |
1653 | /* Check against the defaults. */ |
1654 | if (sinfo->sinfo_stream >= |
1655 | sp->initmsg.sinit_num_ostreams) { |
1656 | err = -EINVAL; |
1657 | goto out_unlock; |
1658 | } |
1659 | } else { |
1660 | /* Check against the requested. */ |
1661 | if (sinfo->sinfo_stream >= |
1662 | sinit->sinit_num_ostreams) { |
1663 | err = -EINVAL; |
1664 | goto out_unlock; |
1665 | } |
1666 | } |
1667 | } |
1668 | |
1669 | /* |
1670 | * API 3.1.2 bind() - UDP Style Syntax |
1671 | * If a bind() or sctp_bindx() is not called prior to a |
1672 | * sendmsg() call that initiates a new association, the |
1673 | * system picks an ephemeral port and will choose an address |
1674 | * set equivalent to binding with a wildcard address. |
1675 | */ |
1676 | if (!ep->base.bind_addr.port) { |
1677 | if (sctp_autobind(sk)) { |
1678 | err = -EAGAIN; |
1679 | goto out_unlock; |
1680 | } |
1681 | } else { |
1682 | /* |
1683 | * If an unprivileged user inherits a one-to-many |
1684 | * style socket with open associations on a privileged |
1685 | * port, it MAY be permitted to accept new associations, |
1686 | * but it SHOULD NOT be permitted to open new |
1687 | * associations. |
1688 | */ |
1689 | if (ep->base.bind_addr.port < PROT_SOCK && |
1690 | !capable(CAP_NET_BIND_SERVICE)) { |
1691 | err = -EACCES; |
1692 | goto out_unlock; |
1693 | } |
1694 | } |
1695 | |
1696 | scope = sctp_scope(&to); |
1697 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1698 | if (!new_asoc) { |
1699 | err = -ENOMEM; |
1700 | goto out_unlock; |
1701 | } |
1702 | asoc = new_asoc; |
1703 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1704 | if (err < 0) { |
1705 | err = -ENOMEM; |
1706 | goto out_free; |
1707 | } |
1708 | |
1709 | /* If the SCTP_INIT ancillary data is specified, set all |
1710 | * the association init values accordingly. |
1711 | */ |
1712 | if (sinit) { |
1713 | if (sinit->sinit_num_ostreams) { |
1714 | asoc->c.sinit_num_ostreams = |
1715 | sinit->sinit_num_ostreams; |
1716 | } |
1717 | if (sinit->sinit_max_instreams) { |
1718 | asoc->c.sinit_max_instreams = |
1719 | sinit->sinit_max_instreams; |
1720 | } |
1721 | if (sinit->sinit_max_attempts) { |
1722 | asoc->max_init_attempts |
1723 | = sinit->sinit_max_attempts; |
1724 | } |
1725 | if (sinit->sinit_max_init_timeo) { |
1726 | asoc->max_init_timeo = |
1727 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1728 | } |
1729 | } |
1730 | |
1731 | /* Prime the peer's transport structures. */ |
1732 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1733 | if (!transport) { |
1734 | err = -ENOMEM; |
1735 | goto out_free; |
1736 | } |
1737 | } |
1738 | |
1739 | /* ASSERT: we have a valid association at this point. */ |
1740 | SCTP_DEBUG_PRINTK("We have a valid association.\n"); |
1741 | |
1742 | if (!sinfo) { |
1743 | /* If the user didn't specify SNDRCVINFO, make up one with |
1744 | * some defaults. |
1745 | */ |
1746 | default_sinfo.sinfo_stream = asoc->default_stream; |
1747 | default_sinfo.sinfo_flags = asoc->default_flags; |
1748 | default_sinfo.sinfo_ppid = asoc->default_ppid; |
1749 | default_sinfo.sinfo_context = asoc->default_context; |
1750 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; |
1751 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); |
1752 | sinfo = &default_sinfo; |
1753 | } |
1754 | |
1755 | /* API 7.1.7, the sndbuf size per association bounds the |
1756 | * maximum size of data that can be sent in a single send call. |
1757 | */ |
1758 | if (msg_len > sk->sk_sndbuf) { |
1759 | err = -EMSGSIZE; |
1760 | goto out_free; |
1761 | } |
1762 | |
1763 | if (asoc->pmtu_pending) |
1764 | sctp_assoc_pending_pmtu(asoc); |
1765 | |
1766 | /* If fragmentation is disabled and the message length exceeds the |
1767 | * association fragmentation point, return EMSGSIZE. The I-D |
1768 | * does not specify what this error is, but this looks like |
1769 | * a great fit. |
1770 | */ |
1771 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { |
1772 | err = -EMSGSIZE; |
1773 | goto out_free; |
1774 | } |
1775 | |
1776 | if (sinfo) { |
1777 | /* Check for invalid stream. */ |
1778 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { |
1779 | err = -EINVAL; |
1780 | goto out_free; |
1781 | } |
1782 | } |
1783 | |
1784 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
1785 | if (!sctp_wspace(asoc)) { |
1786 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); |
1787 | if (err) |
1788 | goto out_free; |
1789 | } |
1790 | |
1791 | /* If an address is passed with the sendto/sendmsg call, it is used |
1792 | * to override the primary destination address in the TCP model, or |
1793 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1794 | */ |
1795 | if ((sctp_style(sk, TCP) && msg_name) || |
1796 | (sinfo_flags & SCTP_ADDR_OVER)) { |
1797 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1798 | if (!chunk_tp) { |
1799 | err = -EINVAL; |
1800 | goto out_free; |
1801 | } |
1802 | } else |
1803 | chunk_tp = NULL; |
1804 | |
1805 | /* Auto-connect, if we aren't connected already. */ |
1806 | if (sctp_state(asoc, CLOSED)) { |
1807 | err = sctp_primitive_ASSOCIATE(asoc, NULL); |
1808 | if (err < 0) |
1809 | goto out_free; |
1810 | SCTP_DEBUG_PRINTK("We associated primitively.\n"); |
1811 | } |
1812 | |
1813 | /* Break the message into multiple chunks of maximum size. */ |
1814 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); |
1815 | if (!datamsg) { |
1816 | err = -ENOMEM; |
1817 | goto out_free; |
1818 | } |
1819 | |
1820 | /* Now send the (possibly) fragmented message. */ |
1821 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
1822 | sctp_chunk_hold(chunk); |
1823 | |
1824 | /* Do accounting for the write space. */ |
1825 | sctp_set_owner_w(chunk); |
1826 | |
1827 | chunk->transport = chunk_tp; |
1828 | } |
1829 | |
1830 | /* Send it to the lower layers. Note: all chunks |
1831 | * must either fail or succeed. The lower layer |
1832 | * works that way today. Keep it that way or this |
1833 | * breaks. |
1834 | */ |
1835 | err = sctp_primitive_SEND(asoc, datamsg); |
1836 | /* Did the lower layer accept the chunk? */ |
1837 | if (err) |
1838 | sctp_datamsg_free(datamsg); |
1839 | else |
1840 | sctp_datamsg_put(datamsg); |
1841 | |
1842 | SCTP_DEBUG_PRINTK("We sent primitively.\n"); |
1843 | |
1844 | if (err) |
1845 | goto out_free; |
1846 | else |
1847 | err = msg_len; |
1848 | |
1849 | /* If we are already past ASSOCIATE, the lower |
1850 | * layers are responsible for association cleanup. |
1851 | */ |
1852 | goto out_unlock; |
1853 | |
1854 | out_free: |
1855 | if (new_asoc) |
1856 | sctp_association_free(asoc); |
1857 | out_unlock: |
1858 | sctp_release_sock(sk); |
1859 | |
1860 | out_nounlock: |
1861 | return sctp_error(sk, msg_flags, err); |
1862 | |
1863 | #if 0 |
1864 | do_sock_err: |
1865 | if (msg_len) |
1866 | err = msg_len; |
1867 | else |
1868 | err = sock_error(sk); |
1869 | goto out; |
1870 | |
1871 | do_interrupted: |
1872 | if (msg_len) |
1873 | err = msg_len; |
1874 | goto out; |
1875 | #endif /* 0 */ |
1876 | } |
1877 | |
1878 | /* This is an extended version of skb_pull() that removes the data from the |
1879 | * start of a skb even when data is spread across the list of skb's in the |
1880 | * frag_list. len specifies the total amount of data that needs to be removed. |
1881 | * when 'len' bytes could be removed from the skb, it returns 0. |
1882 | * If 'len' exceeds the total skb length, it returns the no. of bytes that |
1883 | * could not be removed. |
1884 | */ |
1885 | static int sctp_skb_pull(struct sk_buff *skb, int len) |
1886 | { |
1887 | struct sk_buff *list; |
1888 | int skb_len = skb_headlen(skb); |
1889 | int rlen; |
1890 | |
1891 | if (len <= skb_len) { |
1892 | __skb_pull(skb, len); |
1893 | return 0; |
1894 | } |
1895 | len -= skb_len; |
1896 | __skb_pull(skb, skb_len); |
1897 | |
1898 | skb_walk_frags(skb, list) { |
1899 | rlen = sctp_skb_pull(list, len); |
1900 | skb->len -= (len-rlen); |
1901 | skb->data_len -= (len-rlen); |
1902 | |
1903 | if (!rlen) |
1904 | return 0; |
1905 | |
1906 | len = rlen; |
1907 | } |
1908 | |
1909 | return len; |
1910 | } |
1911 | |
1912 | /* API 3.1.3 recvmsg() - UDP Style Syntax |
1913 | * |
1914 | * ssize_t recvmsg(int socket, struct msghdr *message, |
1915 | * int flags); |
1916 | * |
1917 | * socket - the socket descriptor of the endpoint. |
1918 | * message - pointer to the msghdr structure which contains a single |
1919 | * user message and possibly some ancillary data. |
1920 | * |
1921 | * See Section 5 for complete description of the data |
1922 | * structures. |
1923 | * |
1924 | * flags - flags sent or received with the user message, see Section |
1925 | * 5 for complete description of the flags. |
1926 | */ |
1927 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); |
1928 | |
1929 | SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, |
1930 | struct msghdr *msg, size_t len, int noblock, |
1931 | int flags, int *addr_len) |
1932 | { |
1933 | struct sctp_ulpevent *event = NULL; |
1934 | struct sctp_sock *sp = sctp_sk(sk); |
1935 | struct sk_buff *skb; |
1936 | int copied; |
1937 | int err = 0; |
1938 | int skb_len; |
1939 | |
1940 | SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: " |
1941 | "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg, |
1942 | "len", len, "knoblauch", noblock, |
1943 | "flags", flags, "addr_len", addr_len); |
1944 | |
1945 | sctp_lock_sock(sk); |
1946 | |
1947 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { |
1948 | err = -ENOTCONN; |
1949 | goto out; |
1950 | } |
1951 | |
1952 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); |
1953 | if (!skb) |
1954 | goto out; |
1955 | |
1956 | /* Get the total length of the skb including any skb's in the |
1957 | * frag_list. |
1958 | */ |
1959 | skb_len = skb->len; |
1960 | |
1961 | copied = skb_len; |
1962 | if (copied > len) |
1963 | copied = len; |
1964 | |
1965 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
1966 | |
1967 | event = sctp_skb2event(skb); |
1968 | |
1969 | if (err) |
1970 | goto out_free; |
1971 | |
1972 | sock_recv_ts_and_drops(msg, sk, skb); |
1973 | if (sctp_ulpevent_is_notification(event)) { |
1974 | msg->msg_flags |= MSG_NOTIFICATION; |
1975 | sp->pf->event_msgname(event, msg->msg_name, addr_len); |
1976 | } else { |
1977 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); |
1978 | } |
1979 | |
1980 | /* Check if we allow SCTP_SNDRCVINFO. */ |
1981 | if (sp->subscribe.sctp_data_io_event) |
1982 | sctp_ulpevent_read_sndrcvinfo(event, msg); |
1983 | #if 0 |
1984 | /* FIXME: we should be calling IP/IPv6 layers. */ |
1985 | if (sk->sk_protinfo.af_inet.cmsg_flags) |
1986 | ip_cmsg_recv(msg, skb); |
1987 | #endif |
1988 | |
1989 | err = copied; |
1990 | |
1991 | /* If skb's length exceeds the user's buffer, update the skb and |
1992 | * push it back to the receive_queue so that the next call to |
1993 | * recvmsg() will return the remaining data. Don't set MSG_EOR. |
1994 | */ |
1995 | if (skb_len > copied) { |
1996 | msg->msg_flags &= ~MSG_EOR; |
1997 | if (flags & MSG_PEEK) |
1998 | goto out_free; |
1999 | sctp_skb_pull(skb, copied); |
2000 | skb_queue_head(&sk->sk_receive_queue, skb); |
2001 | |
2002 | /* When only partial message is copied to the user, increase |
2003 | * rwnd by that amount. If all the data in the skb is read, |
2004 | * rwnd is updated when the event is freed. |
2005 | */ |
2006 | if (!sctp_ulpevent_is_notification(event)) |
2007 | sctp_assoc_rwnd_increase(event->asoc, copied); |
2008 | goto out; |
2009 | } else if ((event->msg_flags & MSG_NOTIFICATION) || |
2010 | (event->msg_flags & MSG_EOR)) |
2011 | msg->msg_flags |= MSG_EOR; |
2012 | else |
2013 | msg->msg_flags &= ~MSG_EOR; |
2014 | |
2015 | out_free: |
2016 | if (flags & MSG_PEEK) { |
2017 | /* Release the skb reference acquired after peeking the skb in |
2018 | * sctp_skb_recv_datagram(). |
2019 | */ |
2020 | kfree_skb(skb); |
2021 | } else { |
2022 | /* Free the event which includes releasing the reference to |
2023 | * the owner of the skb, freeing the skb and updating the |
2024 | * rwnd. |
2025 | */ |
2026 | sctp_ulpevent_free(event); |
2027 | } |
2028 | out: |
2029 | sctp_release_sock(sk); |
2030 | return err; |
2031 | } |
2032 | |
2033 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) |
2034 | * |
2035 | * This option is a on/off flag. If enabled no SCTP message |
2036 | * fragmentation will be performed. Instead if a message being sent |
2037 | * exceeds the current PMTU size, the message will NOT be sent and |
2038 | * instead a error will be indicated to the user. |
2039 | */ |
2040 | static int sctp_setsockopt_disable_fragments(struct sock *sk, |
2041 | char __user *optval, |
2042 | unsigned int optlen) |
2043 | { |
2044 | int val; |
2045 | |
2046 | if (optlen < sizeof(int)) |
2047 | return -EINVAL; |
2048 | |
2049 | if (get_user(val, (int __user *)optval)) |
2050 | return -EFAULT; |
2051 | |
2052 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; |
2053 | |
2054 | return 0; |
2055 | } |
2056 | |
2057 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, |
2058 | unsigned int optlen) |
2059 | { |
2060 | if (optlen > sizeof(struct sctp_event_subscribe)) |
2061 | return -EINVAL; |
2062 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) |
2063 | return -EFAULT; |
2064 | return 0; |
2065 | } |
2066 | |
2067 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) |
2068 | * |
2069 | * This socket option is applicable to the UDP-style socket only. When |
2070 | * set it will cause associations that are idle for more than the |
2071 | * specified number of seconds to automatically close. An association |
2072 | * being idle is defined an association that has NOT sent or received |
2073 | * user data. The special value of '0' indicates that no automatic |
2074 | * close of any associations should be performed. The option expects an |
2075 | * integer defining the number of seconds of idle time before an |
2076 | * association is closed. |
2077 | */ |
2078 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, |
2079 | unsigned int optlen) |
2080 | { |
2081 | struct sctp_sock *sp = sctp_sk(sk); |
2082 | |
2083 | /* Applicable to UDP-style socket only */ |
2084 | if (sctp_style(sk, TCP)) |
2085 | return -EOPNOTSUPP; |
2086 | if (optlen != sizeof(int)) |
2087 | return -EINVAL; |
2088 | if (copy_from_user(&sp->autoclose, optval, optlen)) |
2089 | return -EFAULT; |
2090 | /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */ |
2091 | sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ); |
2092 | |
2093 | return 0; |
2094 | } |
2095 | |
2096 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) |
2097 | * |
2098 | * Applications can enable or disable heartbeats for any peer address of |
2099 | * an association, modify an address's heartbeat interval, force a |
2100 | * heartbeat to be sent immediately, and adjust the address's maximum |
2101 | * number of retransmissions sent before an address is considered |
2102 | * unreachable. The following structure is used to access and modify an |
2103 | * address's parameters: |
2104 | * |
2105 | * struct sctp_paddrparams { |
2106 | * sctp_assoc_t spp_assoc_id; |
2107 | * struct sockaddr_storage spp_address; |
2108 | * uint32_t spp_hbinterval; |
2109 | * uint16_t spp_pathmaxrxt; |
2110 | * uint32_t spp_pathmtu; |
2111 | * uint32_t spp_sackdelay; |
2112 | * uint32_t spp_flags; |
2113 | * }; |
2114 | * |
2115 | * spp_assoc_id - (one-to-many style socket) This is filled in the |
2116 | * application, and identifies the association for |
2117 | * this query. |
2118 | * spp_address - This specifies which address is of interest. |
2119 | * spp_hbinterval - This contains the value of the heartbeat interval, |
2120 | * in milliseconds. If a value of zero |
2121 | * is present in this field then no changes are to |
2122 | * be made to this parameter. |
2123 | * spp_pathmaxrxt - This contains the maximum number of |
2124 | * retransmissions before this address shall be |
2125 | * considered unreachable. If a value of zero |
2126 | * is present in this field then no changes are to |
2127 | * be made to this parameter. |
2128 | * spp_pathmtu - When Path MTU discovery is disabled the value |
2129 | * specified here will be the "fixed" path mtu. |
2130 | * Note that if the spp_address field is empty |
2131 | * then all associations on this address will |
2132 | * have this fixed path mtu set upon them. |
2133 | * |
2134 | * spp_sackdelay - When delayed sack is enabled, this value specifies |
2135 | * the number of milliseconds that sacks will be delayed |
2136 | * for. This value will apply to all addresses of an |
2137 | * association if the spp_address field is empty. Note |
2138 | * also, that if delayed sack is enabled and this |
2139 | * value is set to 0, no change is made to the last |
2140 | * recorded delayed sack timer value. |
2141 | * |
2142 | * spp_flags - These flags are used to control various features |
2143 | * on an association. The flag field may contain |
2144 | * zero or more of the following options. |
2145 | * |
2146 | * SPP_HB_ENABLE - Enable heartbeats on the |
2147 | * specified address. Note that if the address |
2148 | * field is empty all addresses for the association |
2149 | * have heartbeats enabled upon them. |
2150 | * |
2151 | * SPP_HB_DISABLE - Disable heartbeats on the |
2152 | * speicifed address. Note that if the address |
2153 | * field is empty all addresses for the association |
2154 | * will have their heartbeats disabled. Note also |
2155 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are |
2156 | * mutually exclusive, only one of these two should |
2157 | * be specified. Enabling both fields will have |
2158 | * undetermined results. |
2159 | * |
2160 | * SPP_HB_DEMAND - Request a user initiated heartbeat |
2161 | * to be made immediately. |
2162 | * |
2163 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2164 | * heartbeat delayis to be set to the value of 0 |
2165 | * milliseconds. |
2166 | * |
2167 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2168 | * discovery upon the specified address. Note that |
2169 | * if the address feild is empty then all addresses |
2170 | * on the association are effected. |
2171 | * |
2172 | * SPP_PMTUD_DISABLE - This field will disable PMTU |
2173 | * discovery upon the specified address. Note that |
2174 | * if the address feild is empty then all addresses |
2175 | * on the association are effected. Not also that |
2176 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually |
2177 | * exclusive. Enabling both will have undetermined |
2178 | * results. |
2179 | * |
2180 | * SPP_SACKDELAY_ENABLE - Setting this flag turns |
2181 | * on delayed sack. The time specified in spp_sackdelay |
2182 | * is used to specify the sack delay for this address. Note |
2183 | * that if spp_address is empty then all addresses will |
2184 | * enable delayed sack and take on the sack delay |
2185 | * value specified in spp_sackdelay. |
2186 | * SPP_SACKDELAY_DISABLE - Setting this flag turns |
2187 | * off delayed sack. If the spp_address field is blank then |
2188 | * delayed sack is disabled for the entire association. Note |
2189 | * also that this field is mutually exclusive to |
2190 | * SPP_SACKDELAY_ENABLE, setting both will have undefined |
2191 | * results. |
2192 | */ |
2193 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2194 | struct sctp_transport *trans, |
2195 | struct sctp_association *asoc, |
2196 | struct sctp_sock *sp, |
2197 | int hb_change, |
2198 | int pmtud_change, |
2199 | int sackdelay_change) |
2200 | { |
2201 | int error; |
2202 | |
2203 | if (params->spp_flags & SPP_HB_DEMAND && trans) { |
2204 | error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans); |
2205 | if (error) |
2206 | return error; |
2207 | } |
2208 | |
2209 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2210 | * this field is ignored. Note also that a value of zero indicates |
2211 | * the current setting should be left unchanged. |
2212 | */ |
2213 | if (params->spp_flags & SPP_HB_ENABLE) { |
2214 | |
2215 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is |
2216 | * set. This lets us use 0 value when this flag |
2217 | * is set. |
2218 | */ |
2219 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) |
2220 | params->spp_hbinterval = 0; |
2221 | |
2222 | if (params->spp_hbinterval || |
2223 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { |
2224 | if (trans) { |
2225 | trans->hbinterval = |
2226 | msecs_to_jiffies(params->spp_hbinterval); |
2227 | } else if (asoc) { |
2228 | asoc->hbinterval = |
2229 | msecs_to_jiffies(params->spp_hbinterval); |
2230 | } else { |
2231 | sp->hbinterval = params->spp_hbinterval; |
2232 | } |
2233 | } |
2234 | } |
2235 | |
2236 | if (hb_change) { |
2237 | if (trans) { |
2238 | trans->param_flags = |
2239 | (trans->param_flags & ~SPP_HB) | hb_change; |
2240 | } else if (asoc) { |
2241 | asoc->param_flags = |
2242 | (asoc->param_flags & ~SPP_HB) | hb_change; |
2243 | } else { |
2244 | sp->param_flags = |
2245 | (sp->param_flags & ~SPP_HB) | hb_change; |
2246 | } |
2247 | } |
2248 | |
2249 | /* When Path MTU discovery is disabled the value specified here will |
2250 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must |
2251 | * include the flag SPP_PMTUD_DISABLE for this field to have any |
2252 | * effect). |
2253 | */ |
2254 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { |
2255 | if (trans) { |
2256 | trans->pathmtu = params->spp_pathmtu; |
2257 | sctp_assoc_sync_pmtu(asoc); |
2258 | } else if (asoc) { |
2259 | asoc->pathmtu = params->spp_pathmtu; |
2260 | sctp_frag_point(asoc, params->spp_pathmtu); |
2261 | } else { |
2262 | sp->pathmtu = params->spp_pathmtu; |
2263 | } |
2264 | } |
2265 | |
2266 | if (pmtud_change) { |
2267 | if (trans) { |
2268 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && |
2269 | (params->spp_flags & SPP_PMTUD_ENABLE); |
2270 | trans->param_flags = |
2271 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; |
2272 | if (update) { |
2273 | sctp_transport_pmtu(trans); |
2274 | sctp_assoc_sync_pmtu(asoc); |
2275 | } |
2276 | } else if (asoc) { |
2277 | asoc->param_flags = |
2278 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; |
2279 | } else { |
2280 | sp->param_flags = |
2281 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; |
2282 | } |
2283 | } |
2284 | |
2285 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2286 | * value of this field is ignored. Note also that a value of zero |
2287 | * indicates the current setting should be left unchanged. |
2288 | */ |
2289 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { |
2290 | if (trans) { |
2291 | trans->sackdelay = |
2292 | msecs_to_jiffies(params->spp_sackdelay); |
2293 | } else if (asoc) { |
2294 | asoc->sackdelay = |
2295 | msecs_to_jiffies(params->spp_sackdelay); |
2296 | } else { |
2297 | sp->sackdelay = params->spp_sackdelay; |
2298 | } |
2299 | } |
2300 | |
2301 | if (sackdelay_change) { |
2302 | if (trans) { |
2303 | trans->param_flags = |
2304 | (trans->param_flags & ~SPP_SACKDELAY) | |
2305 | sackdelay_change; |
2306 | } else if (asoc) { |
2307 | asoc->param_flags = |
2308 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2309 | sackdelay_change; |
2310 | } else { |
2311 | sp->param_flags = |
2312 | (sp->param_flags & ~SPP_SACKDELAY) | |
2313 | sackdelay_change; |
2314 | } |
2315 | } |
2316 | |
2317 | /* Note that a value of zero indicates the current setting should be |
2318 | left unchanged. |
2319 | */ |
2320 | if (params->spp_pathmaxrxt) { |
2321 | if (trans) { |
2322 | trans->pathmaxrxt = params->spp_pathmaxrxt; |
2323 | } else if (asoc) { |
2324 | asoc->pathmaxrxt = params->spp_pathmaxrxt; |
2325 | } else { |
2326 | sp->pathmaxrxt = params->spp_pathmaxrxt; |
2327 | } |
2328 | } |
2329 | |
2330 | return 0; |
2331 | } |
2332 | |
2333 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
2334 | char __user *optval, |
2335 | unsigned int optlen) |
2336 | { |
2337 | struct sctp_paddrparams params; |
2338 | struct sctp_transport *trans = NULL; |
2339 | struct sctp_association *asoc = NULL; |
2340 | struct sctp_sock *sp = sctp_sk(sk); |
2341 | int error; |
2342 | int hb_change, pmtud_change, sackdelay_change; |
2343 | |
2344 | if (optlen != sizeof(struct sctp_paddrparams)) |
2345 | return - EINVAL; |
2346 | |
2347 | if (copy_from_user(¶ms, optval, optlen)) |
2348 | return -EFAULT; |
2349 | |
2350 | /* Validate flags and value parameters. */ |
2351 | hb_change = params.spp_flags & SPP_HB; |
2352 | pmtud_change = params.spp_flags & SPP_PMTUD; |
2353 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; |
2354 | |
2355 | if (hb_change == SPP_HB || |
2356 | pmtud_change == SPP_PMTUD || |
2357 | sackdelay_change == SPP_SACKDELAY || |
2358 | params.spp_sackdelay > 500 || |
2359 | (params.spp_pathmtu && |
2360 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) |
2361 | return -EINVAL; |
2362 | |
2363 | /* If an address other than INADDR_ANY is specified, and |
2364 | * no transport is found, then the request is invalid. |
2365 | */ |
2366 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
2367 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2368 | params.spp_assoc_id); |
2369 | if (!trans) |
2370 | return -EINVAL; |
2371 | } |
2372 | |
2373 | /* Get association, if assoc_id != 0 and the socket is a one |
2374 | * to many style socket, and an association was not found, then |
2375 | * the id was invalid. |
2376 | */ |
2377 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); |
2378 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) |
2379 | return -EINVAL; |
2380 | |
2381 | /* Heartbeat demand can only be sent on a transport or |
2382 | * association, but not a socket. |
2383 | */ |
2384 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2385 | return -EINVAL; |
2386 | |
2387 | /* Process parameters. */ |
2388 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2389 | hb_change, pmtud_change, |
2390 | sackdelay_change); |
2391 | |
2392 | if (error) |
2393 | return error; |
2394 | |
2395 | /* If changes are for association, also apply parameters to each |
2396 | * transport. |
2397 | */ |
2398 | if (!trans && asoc) { |
2399 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2400 | transports) { |
2401 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2402 | hb_change, pmtud_change, |
2403 | sackdelay_change); |
2404 | } |
2405 | } |
2406 | |
2407 | return 0; |
2408 | } |
2409 | |
2410 | /* |
2411 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) |
2412 | * |
2413 | * This option will effect the way delayed acks are performed. This |
2414 | * option allows you to get or set the delayed ack time, in |
2415 | * milliseconds. It also allows changing the delayed ack frequency. |
2416 | * Changing the frequency to 1 disables the delayed sack algorithm. If |
2417 | * the assoc_id is 0, then this sets or gets the endpoints default |
2418 | * values. If the assoc_id field is non-zero, then the set or get |
2419 | * effects the specified association for the one to many model (the |
2420 | * assoc_id field is ignored by the one to one model). Note that if |
2421 | * sack_delay or sack_freq are 0 when setting this option, then the |
2422 | * current values will remain unchanged. |
2423 | * |
2424 | * struct sctp_sack_info { |
2425 | * sctp_assoc_t sack_assoc_id; |
2426 | * uint32_t sack_delay; |
2427 | * uint32_t sack_freq; |
2428 | * }; |
2429 | * |
2430 | * sack_assoc_id - This parameter, indicates which association the user |
2431 | * is performing an action upon. Note that if this field's value is |
2432 | * zero then the endpoints default value is changed (effecting future |
2433 | * associations only). |
2434 | * |
2435 | * sack_delay - This parameter contains the number of milliseconds that |
2436 | * the user is requesting the delayed ACK timer be set to. Note that |
2437 | * this value is defined in the standard to be between 200 and 500 |
2438 | * milliseconds. |
2439 | * |
2440 | * sack_freq - This parameter contains the number of packets that must |
2441 | * be received before a sack is sent without waiting for the delay |
2442 | * timer to expire. The default value for this is 2, setting this |
2443 | * value to 1 will disable the delayed sack algorithm. |
2444 | */ |
2445 | |
2446 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
2447 | char __user *optval, unsigned int optlen) |
2448 | { |
2449 | struct sctp_sack_info params; |
2450 | struct sctp_transport *trans = NULL; |
2451 | struct sctp_association *asoc = NULL; |
2452 | struct sctp_sock *sp = sctp_sk(sk); |
2453 | |
2454 | if (optlen == sizeof(struct sctp_sack_info)) { |
2455 | if (copy_from_user(¶ms, optval, optlen)) |
2456 | return -EFAULT; |
2457 | |
2458 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2459 | return 0; |
2460 | } else if (optlen == sizeof(struct sctp_assoc_value)) { |
2461 | printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value " |
2462 | "in delayed_ack socket option deprecated\n"); |
2463 | printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n"); |
2464 | if (copy_from_user(¶ms, optval, optlen)) |
2465 | return -EFAULT; |
2466 | |
2467 | if (params.sack_delay == 0) |
2468 | params.sack_freq = 1; |
2469 | else |
2470 | params.sack_freq = 0; |
2471 | } else |
2472 | return - EINVAL; |
2473 | |
2474 | /* Validate value parameter. */ |
2475 | if (params.sack_delay > 500) |
2476 | return -EINVAL; |
2477 | |
2478 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
2479 | * to many style socket, and an association was not found, then |
2480 | * the id was invalid. |
2481 | */ |
2482 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2483 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) |
2484 | return -EINVAL; |
2485 | |
2486 | if (params.sack_delay) { |
2487 | if (asoc) { |
2488 | asoc->sackdelay = |
2489 | msecs_to_jiffies(params.sack_delay); |
2490 | asoc->param_flags = |
2491 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2492 | SPP_SACKDELAY_ENABLE; |
2493 | } else { |
2494 | sp->sackdelay = params.sack_delay; |
2495 | sp->param_flags = |
2496 | (sp->param_flags & ~SPP_SACKDELAY) | |
2497 | SPP_SACKDELAY_ENABLE; |
2498 | } |
2499 | } |
2500 | |
2501 | if (params.sack_freq == 1) { |
2502 | if (asoc) { |
2503 | asoc->param_flags = |
2504 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2505 | SPP_SACKDELAY_DISABLE; |
2506 | } else { |
2507 | sp->param_flags = |
2508 | (sp->param_flags & ~SPP_SACKDELAY) | |
2509 | SPP_SACKDELAY_DISABLE; |
2510 | } |
2511 | } else if (params.sack_freq > 1) { |
2512 | if (asoc) { |
2513 | asoc->sackfreq = params.sack_freq; |
2514 | asoc->param_flags = |
2515 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2516 | SPP_SACKDELAY_ENABLE; |
2517 | } else { |
2518 | sp->sackfreq = params.sack_freq; |
2519 | sp->param_flags = |
2520 | (sp->param_flags & ~SPP_SACKDELAY) | |
2521 | SPP_SACKDELAY_ENABLE; |
2522 | } |
2523 | } |
2524 | |
2525 | /* If change is for association, also apply to each transport. */ |
2526 | if (asoc) { |
2527 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2528 | transports) { |
2529 | if (params.sack_delay) { |
2530 | trans->sackdelay = |
2531 | msecs_to_jiffies(params.sack_delay); |
2532 | trans->param_flags = |
2533 | (trans->param_flags & ~SPP_SACKDELAY) | |
2534 | SPP_SACKDELAY_ENABLE; |
2535 | } |
2536 | if (params.sack_freq == 1) { |
2537 | trans->param_flags = |
2538 | (trans->param_flags & ~SPP_SACKDELAY) | |
2539 | SPP_SACKDELAY_DISABLE; |
2540 | } else if (params.sack_freq > 1) { |
2541 | trans->sackfreq = params.sack_freq; |
2542 | trans->param_flags = |
2543 | (trans->param_flags & ~SPP_SACKDELAY) | |
2544 | SPP_SACKDELAY_ENABLE; |
2545 | } |
2546 | } |
2547 | } |
2548 | |
2549 | return 0; |
2550 | } |
2551 | |
2552 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2553 | * |
2554 | * Applications can specify protocol parameters for the default association |
2555 | * initialization. The option name argument to setsockopt() and getsockopt() |
2556 | * is SCTP_INITMSG. |
2557 | * |
2558 | * Setting initialization parameters is effective only on an unconnected |
2559 | * socket (for UDP-style sockets only future associations are effected |
2560 | * by the change). With TCP-style sockets, this option is inherited by |
2561 | * sockets derived from a listener socket. |
2562 | */ |
2563 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
2564 | { |
2565 | struct sctp_initmsg sinit; |
2566 | struct sctp_sock *sp = sctp_sk(sk); |
2567 | |
2568 | if (optlen != sizeof(struct sctp_initmsg)) |
2569 | return -EINVAL; |
2570 | if (copy_from_user(&sinit, optval, optlen)) |
2571 | return -EFAULT; |
2572 | |
2573 | if (sinit.sinit_num_ostreams) |
2574 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
2575 | if (sinit.sinit_max_instreams) |
2576 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
2577 | if (sinit.sinit_max_attempts) |
2578 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
2579 | if (sinit.sinit_max_init_timeo) |
2580 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
2581 | |
2582 | return 0; |
2583 | } |
2584 | |
2585 | /* |
2586 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) |
2587 | * |
2588 | * Applications that wish to use the sendto() system call may wish to |
2589 | * specify a default set of parameters that would normally be supplied |
2590 | * through the inclusion of ancillary data. This socket option allows |
2591 | * such an application to set the default sctp_sndrcvinfo structure. |
2592 | * The application that wishes to use this socket option simply passes |
2593 | * in to this call the sctp_sndrcvinfo structure defined in Section |
2594 | * 5.2.2) The input parameters accepted by this call include |
2595 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, |
2596 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in |
2597 | * to this call if the caller is using the UDP model. |
2598 | */ |
2599 | static int sctp_setsockopt_default_send_param(struct sock *sk, |
2600 | char __user *optval, |
2601 | unsigned int optlen) |
2602 | { |
2603 | struct sctp_sndrcvinfo info; |
2604 | struct sctp_association *asoc; |
2605 | struct sctp_sock *sp = sctp_sk(sk); |
2606 | |
2607 | if (optlen != sizeof(struct sctp_sndrcvinfo)) |
2608 | return -EINVAL; |
2609 | if (copy_from_user(&info, optval, optlen)) |
2610 | return -EFAULT; |
2611 | |
2612 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); |
2613 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) |
2614 | return -EINVAL; |
2615 | |
2616 | if (asoc) { |
2617 | asoc->default_stream = info.sinfo_stream; |
2618 | asoc->default_flags = info.sinfo_flags; |
2619 | asoc->default_ppid = info.sinfo_ppid; |
2620 | asoc->default_context = info.sinfo_context; |
2621 | asoc->default_timetolive = info.sinfo_timetolive; |
2622 | } else { |
2623 | sp->default_stream = info.sinfo_stream; |
2624 | sp->default_flags = info.sinfo_flags; |
2625 | sp->default_ppid = info.sinfo_ppid; |
2626 | sp->default_context = info.sinfo_context; |
2627 | sp->default_timetolive = info.sinfo_timetolive; |
2628 | } |
2629 | |
2630 | return 0; |
2631 | } |
2632 | |
2633 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) |
2634 | * |
2635 | * Requests that the local SCTP stack use the enclosed peer address as |
2636 | * the association primary. The enclosed address must be one of the |
2637 | * association peer's addresses. |
2638 | */ |
2639 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, |
2640 | unsigned int optlen) |
2641 | { |
2642 | struct sctp_prim prim; |
2643 | struct sctp_transport *trans; |
2644 | |
2645 | if (optlen != sizeof(struct sctp_prim)) |
2646 | return -EINVAL; |
2647 | |
2648 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) |
2649 | return -EFAULT; |
2650 | |
2651 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); |
2652 | if (!trans) |
2653 | return -EINVAL; |
2654 | |
2655 | sctp_assoc_set_primary(trans->asoc, trans); |
2656 | |
2657 | return 0; |
2658 | } |
2659 | |
2660 | /* |
2661 | * 7.1.5 SCTP_NODELAY |
2662 | * |
2663 | * Turn on/off any Nagle-like algorithm. This means that packets are |
2664 | * generally sent as soon as possible and no unnecessary delays are |
2665 | * introduced, at the cost of more packets in the network. Expects an |
2666 | * integer boolean flag. |
2667 | */ |
2668 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, |
2669 | unsigned int optlen) |
2670 | { |
2671 | int val; |
2672 | |
2673 | if (optlen < sizeof(int)) |
2674 | return -EINVAL; |
2675 | if (get_user(val, (int __user *)optval)) |
2676 | return -EFAULT; |
2677 | |
2678 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; |
2679 | return 0; |
2680 | } |
2681 | |
2682 | /* |
2683 | * |
2684 | * 7.1.1 SCTP_RTOINFO |
2685 | * |
2686 | * The protocol parameters used to initialize and bound retransmission |
2687 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access |
2688 | * and modify these parameters. |
2689 | * All parameters are time values, in milliseconds. A value of 0, when |
2690 | * modifying the parameters, indicates that the current value should not |
2691 | * be changed. |
2692 | * |
2693 | */ |
2694 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2695 | { |
2696 | struct sctp_rtoinfo rtoinfo; |
2697 | struct sctp_association *asoc; |
2698 | |
2699 | if (optlen != sizeof (struct sctp_rtoinfo)) |
2700 | return -EINVAL; |
2701 | |
2702 | if (copy_from_user(&rtoinfo, optval, optlen)) |
2703 | return -EFAULT; |
2704 | |
2705 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); |
2706 | |
2707 | /* Set the values to the specific association */ |
2708 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) |
2709 | return -EINVAL; |
2710 | |
2711 | if (asoc) { |
2712 | if (rtoinfo.srto_initial != 0) |
2713 | asoc->rto_initial = |
2714 | msecs_to_jiffies(rtoinfo.srto_initial); |
2715 | if (rtoinfo.srto_max != 0) |
2716 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); |
2717 | if (rtoinfo.srto_min != 0) |
2718 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); |
2719 | } else { |
2720 | /* If there is no association or the association-id = 0 |
2721 | * set the values to the endpoint. |
2722 | */ |
2723 | struct sctp_sock *sp = sctp_sk(sk); |
2724 | |
2725 | if (rtoinfo.srto_initial != 0) |
2726 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; |
2727 | if (rtoinfo.srto_max != 0) |
2728 | sp->rtoinfo.srto_max = rtoinfo.srto_max; |
2729 | if (rtoinfo.srto_min != 0) |
2730 | sp->rtoinfo.srto_min = rtoinfo.srto_min; |
2731 | } |
2732 | |
2733 | return 0; |
2734 | } |
2735 | |
2736 | /* |
2737 | * |
2738 | * 7.1.2 SCTP_ASSOCINFO |
2739 | * |
2740 | * This option is used to tune the maximum retransmission attempts |
2741 | * of the association. |
2742 | * Returns an error if the new association retransmission value is |
2743 | * greater than the sum of the retransmission value of the peer. |
2744 | * See [SCTP] for more information. |
2745 | * |
2746 | */ |
2747 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2748 | { |
2749 | |
2750 | struct sctp_assocparams assocparams; |
2751 | struct sctp_association *asoc; |
2752 | |
2753 | if (optlen != sizeof(struct sctp_assocparams)) |
2754 | return -EINVAL; |
2755 | if (copy_from_user(&assocparams, optval, optlen)) |
2756 | return -EFAULT; |
2757 | |
2758 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); |
2759 | |
2760 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) |
2761 | return -EINVAL; |
2762 | |
2763 | /* Set the values to the specific association */ |
2764 | if (asoc) { |
2765 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2766 | __u32 path_sum = 0; |
2767 | int paths = 0; |
2768 | struct sctp_transport *peer_addr; |
2769 | |
2770 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2771 | transports) { |
2772 | path_sum += peer_addr->pathmaxrxt; |
2773 | paths++; |
2774 | } |
2775 | |
2776 | /* Only validate asocmaxrxt if we have more than |
2777 | * one path/transport. We do this because path |
2778 | * retransmissions are only counted when we have more |
2779 | * then one path. |
2780 | */ |
2781 | if (paths > 1 && |
2782 | assocparams.sasoc_asocmaxrxt > path_sum) |
2783 | return -EINVAL; |
2784 | |
2785 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
2786 | } |
2787 | |
2788 | if (assocparams.sasoc_cookie_life != 0) { |
2789 | asoc->cookie_life.tv_sec = |
2790 | assocparams.sasoc_cookie_life / 1000; |
2791 | asoc->cookie_life.tv_usec = |
2792 | (assocparams.sasoc_cookie_life % 1000) |
2793 | * 1000; |
2794 | } |
2795 | } else { |
2796 | /* Set the values to the endpoint */ |
2797 | struct sctp_sock *sp = sctp_sk(sk); |
2798 | |
2799 | if (assocparams.sasoc_asocmaxrxt != 0) |
2800 | sp->assocparams.sasoc_asocmaxrxt = |
2801 | assocparams.sasoc_asocmaxrxt; |
2802 | if (assocparams.sasoc_cookie_life != 0) |
2803 | sp->assocparams.sasoc_cookie_life = |
2804 | assocparams.sasoc_cookie_life; |
2805 | } |
2806 | return 0; |
2807 | } |
2808 | |
2809 | /* |
2810 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) |
2811 | * |
2812 | * This socket option is a boolean flag which turns on or off mapped V4 |
2813 | * addresses. If this option is turned on and the socket is type |
2814 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. |
2815 | * If this option is turned off, then no mapping will be done of V4 |
2816 | * addresses and a user will receive both PF_INET6 and PF_INET type |
2817 | * addresses on the socket. |
2818 | */ |
2819 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
2820 | { |
2821 | int val; |
2822 | struct sctp_sock *sp = sctp_sk(sk); |
2823 | |
2824 | if (optlen < sizeof(int)) |
2825 | return -EINVAL; |
2826 | if (get_user(val, (int __user *)optval)) |
2827 | return -EFAULT; |
2828 | if (val) |
2829 | sp->v4mapped = 1; |
2830 | else |
2831 | sp->v4mapped = 0; |
2832 | |
2833 | return 0; |
2834 | } |
2835 | |
2836 | /* |
2837 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2838 | * This option will get or set the maximum size to put in any outgoing |
2839 | * SCTP DATA chunk. If a message is larger than this size it will be |
2840 | * fragmented by SCTP into the specified size. Note that the underlying |
2841 | * SCTP implementation may fragment into smaller sized chunks when the |
2842 | * PMTU of the underlying association is smaller than the value set by |
2843 | * the user. The default value for this option is '0' which indicates |
2844 | * the user is NOT limiting fragmentation and only the PMTU will effect |
2845 | * SCTP's choice of DATA chunk size. Note also that values set larger |
2846 | * than the maximum size of an IP datagram will effectively let SCTP |
2847 | * control fragmentation (i.e. the same as setting this option to 0). |
2848 | * |
2849 | * The following structure is used to access and modify this parameter: |
2850 | * |
2851 | * struct sctp_assoc_value { |
2852 | * sctp_assoc_t assoc_id; |
2853 | * uint32_t assoc_value; |
2854 | * }; |
2855 | * |
2856 | * assoc_id: This parameter is ignored for one-to-one style sockets. |
2857 | * For one-to-many style sockets this parameter indicates which |
2858 | * association the user is performing an action upon. Note that if |
2859 | * this field's value is zero then the endpoints default value is |
2860 | * changed (effecting future associations only). |
2861 | * assoc_value: This parameter specifies the maximum size in bytes. |
2862 | */ |
2863 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
2864 | { |
2865 | struct sctp_assoc_value params; |
2866 | struct sctp_association *asoc; |
2867 | struct sctp_sock *sp = sctp_sk(sk); |
2868 | int val; |
2869 | |
2870 | if (optlen == sizeof(int)) { |
2871 | printk(KERN_WARNING |
2872 | "SCTP: Use of int in maxseg socket option deprecated\n"); |
2873 | printk(KERN_WARNING |
2874 | "SCTP: Use struct sctp_assoc_value instead\n"); |
2875 | if (copy_from_user(&val, optval, optlen)) |
2876 | return -EFAULT; |
2877 | params.assoc_id = 0; |
2878 | } else if (optlen == sizeof(struct sctp_assoc_value)) { |
2879 | if (copy_from_user(¶ms, optval, optlen)) |
2880 | return -EFAULT; |
2881 | val = params.assoc_value; |
2882 | } else |
2883 | return -EINVAL; |
2884 | |
2885 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
2886 | return -EINVAL; |
2887 | |
2888 | asoc = sctp_id2assoc(sk, params.assoc_id); |
2889 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) |
2890 | return -EINVAL; |
2891 | |
2892 | if (asoc) { |
2893 | if (val == 0) { |
2894 | val = asoc->pathmtu; |
2895 | val -= sp->pf->af->net_header_len; |
2896 | val -= sizeof(struct sctphdr) + |
2897 | sizeof(struct sctp_data_chunk); |
2898 | } |
2899 | asoc->user_frag = val; |
2900 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); |
2901 | } else { |
2902 | sp->user_frag = val; |
2903 | } |
2904 | |
2905 | return 0; |
2906 | } |
2907 | |
2908 | |
2909 | /* |
2910 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) |
2911 | * |
2912 | * Requests that the peer mark the enclosed address as the association |
2913 | * primary. The enclosed address must be one of the association's |
2914 | * locally bound addresses. The following structure is used to make a |
2915 | * set primary request: |
2916 | */ |
2917 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, |
2918 | unsigned int optlen) |
2919 | { |
2920 | struct sctp_sock *sp; |
2921 | struct sctp_endpoint *ep; |
2922 | struct sctp_association *asoc = NULL; |
2923 | struct sctp_setpeerprim prim; |
2924 | struct sctp_chunk *chunk; |
2925 | int err; |
2926 | |
2927 | sp = sctp_sk(sk); |
2928 | ep = sp->ep; |
2929 | |
2930 | if (!sctp_addip_enable) |
2931 | return -EPERM; |
2932 | |
2933 | if (optlen != sizeof(struct sctp_setpeerprim)) |
2934 | return -EINVAL; |
2935 | |
2936 | if (copy_from_user(&prim, optval, optlen)) |
2937 | return -EFAULT; |
2938 | |
2939 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); |
2940 | if (!asoc) |
2941 | return -EINVAL; |
2942 | |
2943 | if (!asoc->peer.asconf_capable) |
2944 | return -EPERM; |
2945 | |
2946 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) |
2947 | return -EPERM; |
2948 | |
2949 | if (!sctp_state(asoc, ESTABLISHED)) |
2950 | return -ENOTCONN; |
2951 | |
2952 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
2953 | return -EADDRNOTAVAIL; |
2954 | |
2955 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ |
2956 | chunk = sctp_make_asconf_set_prim(asoc, |
2957 | (union sctp_addr *)&prim.sspp_addr); |
2958 | if (!chunk) |
2959 | return -ENOMEM; |
2960 | |
2961 | err = sctp_send_asconf(asoc, chunk); |
2962 | |
2963 | SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n"); |
2964 | |
2965 | return err; |
2966 | } |
2967 | |
2968 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
2969 | unsigned int optlen) |
2970 | { |
2971 | struct sctp_setadaptation adaptation; |
2972 | |
2973 | if (optlen != sizeof(struct sctp_setadaptation)) |
2974 | return -EINVAL; |
2975 | if (copy_from_user(&adaptation, optval, optlen)) |
2976 | return -EFAULT; |
2977 | |
2978 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
2979 | |
2980 | return 0; |
2981 | } |
2982 | |
2983 | /* |
2984 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) |
2985 | * |
2986 | * The context field in the sctp_sndrcvinfo structure is normally only |
2987 | * used when a failed message is retrieved holding the value that was |
2988 | * sent down on the actual send call. This option allows the setting of |
2989 | * a default context on an association basis that will be received on |
2990 | * reading messages from the peer. This is especially helpful in the |
2991 | * one-2-many model for an application to keep some reference to an |
2992 | * internal state machine that is processing messages on the |
2993 | * association. Note that the setting of this value only effects |
2994 | * received messages from the peer and does not effect the value that is |
2995 | * saved with outbound messages. |
2996 | */ |
2997 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, |
2998 | unsigned int optlen) |
2999 | { |
3000 | struct sctp_assoc_value params; |
3001 | struct sctp_sock *sp; |
3002 | struct sctp_association *asoc; |
3003 | |
3004 | if (optlen != sizeof(struct sctp_assoc_value)) |
3005 | return -EINVAL; |
3006 | if (copy_from_user(¶ms, optval, optlen)) |
3007 | return -EFAULT; |
3008 | |
3009 | sp = sctp_sk(sk); |
3010 | |
3011 | if (params.assoc_id != 0) { |
3012 | asoc = sctp_id2assoc(sk, params.assoc_id); |
3013 | if (!asoc) |
3014 | return -EINVAL; |
3015 | asoc->default_rcv_context = params.assoc_value; |
3016 | } else { |
3017 | sp->default_rcv_context = params.assoc_value; |
3018 | } |
3019 | |
3020 | return 0; |
3021 | } |
3022 | |
3023 | /* |
3024 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) |
3025 | * |
3026 | * This options will at a minimum specify if the implementation is doing |
3027 | * fragmented interleave. Fragmented interleave, for a one to many |
3028 | * socket, is when subsequent calls to receive a message may return |
3029 | * parts of messages from different associations. Some implementations |
3030 | * may allow you to turn this value on or off. If so, when turned off, |
3031 | * no fragment interleave will occur (which will cause a head of line |
3032 | * blocking amongst multiple associations sharing the same one to many |
3033 | * socket). When this option is turned on, then each receive call may |
3034 | * come from a different association (thus the user must receive data |
3035 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which |
3036 | * association each receive belongs to. |
3037 | * |
3038 | * This option takes a boolean value. A non-zero value indicates that |
3039 | * fragmented interleave is on. A value of zero indicates that |
3040 | * fragmented interleave is off. |
3041 | * |
3042 | * Note that it is important that an implementation that allows this |
3043 | * option to be turned on, have it off by default. Otherwise an unaware |
3044 | * application using the one to many model may become confused and act |
3045 | * incorrectly. |
3046 | */ |
3047 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, |
3048 | char __user *optval, |
3049 | unsigned int optlen) |
3050 | { |
3051 | int val; |
3052 | |
3053 | if (optlen != sizeof(int)) |
3054 | return -EINVAL; |
3055 | if (get_user(val, (int __user *)optval)) |
3056 | return -EFAULT; |
3057 | |
3058 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; |
3059 | |
3060 | return 0; |
3061 | } |
3062 | |
3063 | /* |
3064 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
3065 | * (SCTP_PARTIAL_DELIVERY_POINT) |
3066 | * |
3067 | * This option will set or get the SCTP partial delivery point. This |
3068 | * point is the size of a message where the partial delivery API will be |
3069 | * invoked to help free up rwnd space for the peer. Setting this to a |
3070 | * lower value will cause partial deliveries to happen more often. The |
3071 | * calls argument is an integer that sets or gets the partial delivery |
3072 | * point. Note also that the call will fail if the user attempts to set |
3073 | * this value larger than the socket receive buffer size. |
3074 | * |
3075 | * Note that any single message having a length smaller than or equal to |
3076 | * the SCTP partial delivery point will be delivered in one single read |
3077 | * call as long as the user provided buffer is large enough to hold the |
3078 | * message. |
3079 | */ |
3080 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, |
3081 | char __user *optval, |
3082 | unsigned int optlen) |
3083 | { |
3084 | u32 val; |
3085 | |
3086 | if (optlen != sizeof(u32)) |
3087 | return -EINVAL; |
3088 | if (get_user(val, (int __user *)optval)) |
3089 | return -EFAULT; |
3090 | |
3091 | /* Note: We double the receive buffer from what the user sets |
3092 | * it to be, also initial rwnd is based on rcvbuf/2. |
3093 | */ |
3094 | if (val > (sk->sk_rcvbuf >> 1)) |
3095 | return -EINVAL; |
3096 | |
3097 | sctp_sk(sk)->pd_point = val; |
3098 | |
3099 | return 0; /* is this the right error code? */ |
3100 | } |
3101 | |
3102 | /* |
3103 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) |
3104 | * |
3105 | * This option will allow a user to change the maximum burst of packets |
3106 | * that can be emitted by this association. Note that the default value |
3107 | * is 4, and some implementations may restrict this setting so that it |
3108 | * can only be lowered. |
3109 | * |
3110 | * NOTE: This text doesn't seem right. Do this on a socket basis with |
3111 | * future associations inheriting the socket value. |
3112 | */ |
3113 | static int sctp_setsockopt_maxburst(struct sock *sk, |
3114 | char __user *optval, |
3115 | unsigned int optlen) |
3116 | { |
3117 | struct sctp_assoc_value params; |
3118 | struct sctp_sock *sp; |
3119 | struct sctp_association *asoc; |
3120 | int val; |
3121 | int assoc_id = 0; |
3122 | |
3123 | if (optlen == sizeof(int)) { |
3124 | printk(KERN_WARNING |
3125 | "SCTP: Use of int in max_burst socket option deprecated\n"); |
3126 | printk(KERN_WARNING |
3127 | "SCTP: Use struct sctp_assoc_value instead\n"); |
3128 | if (copy_from_user(&val, optval, optlen)) |
3129 | return -EFAULT; |
3130 | } else if (optlen == sizeof(struct sctp_assoc_value)) { |
3131 | if (copy_from_user(¶ms, optval, optlen)) |
3132 | return -EFAULT; |
3133 | val = params.assoc_value; |
3134 | assoc_id = params.assoc_id; |
3135 | } else |
3136 | return -EINVAL; |
3137 | |
3138 | sp = sctp_sk(sk); |
3139 | |
3140 | if (assoc_id != 0) { |
3141 | asoc = sctp_id2assoc(sk, assoc_id); |
3142 | if (!asoc) |
3143 | return -EINVAL; |
3144 | asoc->max_burst = val; |
3145 | } else |
3146 | sp->max_burst = val; |
3147 | |
3148 | return 0; |
3149 | } |
3150 | |
3151 | /* |
3152 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) |
3153 | * |
3154 | * This set option adds a chunk type that the user is requesting to be |
3155 | * received only in an authenticated way. Changes to the list of chunks |
3156 | * will only effect future associations on the socket. |
3157 | */ |
3158 | static int sctp_setsockopt_auth_chunk(struct sock *sk, |
3159 | char __user *optval, |
3160 | unsigned int optlen) |
3161 | { |
3162 | struct sctp_authchunk val; |
3163 | |
3164 | if (!sctp_auth_enable) |
3165 | return -EACCES; |
3166 | |
3167 | if (optlen != sizeof(struct sctp_authchunk)) |
3168 | return -EINVAL; |
3169 | if (copy_from_user(&val, optval, optlen)) |
3170 | return -EFAULT; |
3171 | |
3172 | switch (val.sauth_chunk) { |
3173 | case SCTP_CID_INIT: |
3174 | case SCTP_CID_INIT_ACK: |
3175 | case SCTP_CID_SHUTDOWN_COMPLETE: |
3176 | case SCTP_CID_AUTH: |
3177 | return -EINVAL; |
3178 | } |
3179 | |
3180 | /* add this chunk id to the endpoint */ |
3181 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); |
3182 | } |
3183 | |
3184 | /* |
3185 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) |
3186 | * |
3187 | * This option gets or sets the list of HMAC algorithms that the local |
3188 | * endpoint requires the peer to use. |
3189 | */ |
3190 | static int sctp_setsockopt_hmac_ident(struct sock *sk, |
3191 | char __user *optval, |
3192 | unsigned int optlen) |
3193 | { |
3194 | struct sctp_hmacalgo *hmacs; |
3195 | u32 idents; |
3196 | int err; |
3197 | |
3198 | if (!sctp_auth_enable) |
3199 | return -EACCES; |
3200 | |
3201 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3202 | return -EINVAL; |
3203 | |
3204 | hmacs = kmalloc(optlen, GFP_KERNEL); |
3205 | if (!hmacs) |
3206 | return -ENOMEM; |
3207 | |
3208 | if (copy_from_user(hmacs, optval, optlen)) { |
3209 | err = -EFAULT; |
3210 | goto out; |
3211 | } |
3212 | |
3213 | idents = hmacs->shmac_num_idents; |
3214 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || |
3215 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { |
3216 | err = -EINVAL; |
3217 | goto out; |
3218 | } |
3219 | |
3220 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); |
3221 | out: |
3222 | kfree(hmacs); |
3223 | return err; |
3224 | } |
3225 | |
3226 | /* |
3227 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) |
3228 | * |
3229 | * This option will set a shared secret key which is used to build an |
3230 | * association shared key. |
3231 | */ |
3232 | static int sctp_setsockopt_auth_key(struct sock *sk, |
3233 | char __user *optval, |
3234 | unsigned int optlen) |
3235 | { |
3236 | struct sctp_authkey *authkey; |
3237 | struct sctp_association *asoc; |
3238 | int ret; |
3239 | |
3240 | if (!sctp_auth_enable) |
3241 | return -EACCES; |
3242 | |
3243 | if (optlen <= sizeof(struct sctp_authkey)) |
3244 | return -EINVAL; |
3245 | |
3246 | authkey = kmalloc(optlen, GFP_KERNEL); |
3247 | if (!authkey) |
3248 | return -ENOMEM; |
3249 | |
3250 | if (copy_from_user(authkey, optval, optlen)) { |
3251 | ret = -EFAULT; |
3252 | goto out; |
3253 | } |
3254 | |
3255 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
3256 | ret = -EINVAL; |
3257 | goto out; |
3258 | } |
3259 | |
3260 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3261 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { |
3262 | ret = -EINVAL; |
3263 | goto out; |
3264 | } |
3265 | |
3266 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); |
3267 | out: |
3268 | kfree(authkey); |
3269 | return ret; |
3270 | } |
3271 | |
3272 | /* |
3273 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) |
3274 | * |
3275 | * This option will get or set the active shared key to be used to build |
3276 | * the association shared key. |
3277 | */ |
3278 | static int sctp_setsockopt_active_key(struct sock *sk, |
3279 | char __user *optval, |
3280 | unsigned int optlen) |
3281 | { |
3282 | struct sctp_authkeyid val; |
3283 | struct sctp_association *asoc; |
3284 | |
3285 | if (!sctp_auth_enable) |
3286 | return -EACCES; |
3287 | |
3288 | if (optlen != sizeof(struct sctp_authkeyid)) |
3289 | return -EINVAL; |
3290 | if (copy_from_user(&val, optval, optlen)) |
3291 | return -EFAULT; |
3292 | |
3293 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); |
3294 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) |
3295 | return -EINVAL; |
3296 | |
3297 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, |
3298 | val.scact_keynumber); |
3299 | } |
3300 | |
3301 | /* |
3302 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) |
3303 | * |
3304 | * This set option will delete a shared secret key from use. |
3305 | */ |
3306 | static int sctp_setsockopt_del_key(struct sock *sk, |
3307 | char __user *optval, |
3308 | unsigned int optlen) |
3309 | { |
3310 | struct sctp_authkeyid val; |
3311 | struct sctp_association *asoc; |
3312 | |
3313 | if (!sctp_auth_enable) |
3314 | return -EACCES; |
3315 | |
3316 | if (optlen != sizeof(struct sctp_authkeyid)) |
3317 | return -EINVAL; |
3318 | if (copy_from_user(&val, optval, optlen)) |
3319 | return -EFAULT; |
3320 | |
3321 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); |
3322 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) |
3323 | return -EINVAL; |
3324 | |
3325 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, |
3326 | val.scact_keynumber); |
3327 | |
3328 | } |
3329 | |
3330 | |
3331 | /* API 6.2 setsockopt(), getsockopt() |
3332 | * |
3333 | * Applications use setsockopt() and getsockopt() to set or retrieve |
3334 | * socket options. Socket options are used to change the default |
3335 | * behavior of sockets calls. They are described in Section 7. |
3336 | * |
3337 | * The syntax is: |
3338 | * |
3339 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, |
3340 | * int __user *optlen); |
3341 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, |
3342 | * int optlen); |
3343 | * |
3344 | * sd - the socket descript. |
3345 | * level - set to IPPROTO_SCTP for all SCTP options. |
3346 | * optname - the option name. |
3347 | * optval - the buffer to store the value of the option. |
3348 | * optlen - the size of the buffer. |
3349 | */ |
3350 | SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, |
3351 | char __user *optval, unsigned int optlen) |
3352 | { |
3353 | int retval = 0; |
3354 | |
3355 | SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n", |
3356 | sk, optname); |
3357 | |
3358 | /* I can hardly begin to describe how wrong this is. This is |
3359 | * so broken as to be worse than useless. The API draft |
3360 | * REALLY is NOT helpful here... I am not convinced that the |
3361 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP |
3362 | * are at all well-founded. |
3363 | */ |
3364 | if (level != SOL_SCTP) { |
3365 | struct sctp_af *af = sctp_sk(sk)->pf->af; |
3366 | retval = af->setsockopt(sk, level, optname, optval, optlen); |
3367 | goto out_nounlock; |
3368 | } |
3369 | |
3370 | sctp_lock_sock(sk); |
3371 | |
3372 | switch (optname) { |
3373 | case SCTP_SOCKOPT_BINDX_ADD: |
3374 | /* 'optlen' is the size of the addresses buffer. */ |
3375 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, |
3376 | optlen, SCTP_BINDX_ADD_ADDR); |
3377 | break; |
3378 | |
3379 | case SCTP_SOCKOPT_BINDX_REM: |
3380 | /* 'optlen' is the size of the addresses buffer. */ |
3381 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, |
3382 | optlen, SCTP_BINDX_REM_ADDR); |
3383 | break; |
3384 | |
3385 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3386 | /* 'optlen' is the size of the addresses buffer. */ |
3387 | retval = sctp_setsockopt_connectx_old(sk, |
3388 | (struct sockaddr __user *)optval, |
3389 | optlen); |
3390 | break; |
3391 | |
3392 | case SCTP_SOCKOPT_CONNECTX: |
3393 | /* 'optlen' is the size of the addresses buffer. */ |
3394 | retval = sctp_setsockopt_connectx(sk, |
3395 | (struct sockaddr __user *)optval, |
3396 | optlen); |
3397 | break; |
3398 | |
3399 | case SCTP_DISABLE_FRAGMENTS: |
3400 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); |
3401 | break; |
3402 | |
3403 | case SCTP_EVENTS: |
3404 | retval = sctp_setsockopt_events(sk, optval, optlen); |
3405 | break; |
3406 | |
3407 | case SCTP_AUTOCLOSE: |
3408 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); |
3409 | break; |
3410 | |
3411 | case SCTP_PEER_ADDR_PARAMS: |
3412 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); |
3413 | break; |
3414 | |
3415 | case SCTP_DELAYED_ACK: |
3416 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
3417 | break; |
3418 | case SCTP_PARTIAL_DELIVERY_POINT: |
3419 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); |
3420 | break; |
3421 | |
3422 | case SCTP_INITMSG: |
3423 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); |
3424 | break; |
3425 | case SCTP_DEFAULT_SEND_PARAM: |
3426 | retval = sctp_setsockopt_default_send_param(sk, optval, |
3427 | optlen); |
3428 | break; |
3429 | case SCTP_PRIMARY_ADDR: |
3430 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); |
3431 | break; |
3432 | case SCTP_SET_PEER_PRIMARY_ADDR: |
3433 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); |
3434 | break; |
3435 | case SCTP_NODELAY: |
3436 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); |
3437 | break; |
3438 | case SCTP_RTOINFO: |
3439 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); |
3440 | break; |
3441 | case SCTP_ASSOCINFO: |
3442 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); |
3443 | break; |
3444 | case SCTP_I_WANT_MAPPED_V4_ADDR: |
3445 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); |
3446 | break; |
3447 | case SCTP_MAXSEG: |
3448 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); |
3449 | break; |
3450 | case SCTP_ADAPTATION_LAYER: |
3451 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); |
3452 | break; |
3453 | case SCTP_CONTEXT: |
3454 | retval = sctp_setsockopt_context(sk, optval, optlen); |
3455 | break; |
3456 | case SCTP_FRAGMENT_INTERLEAVE: |
3457 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); |
3458 | break; |
3459 | case SCTP_MAX_BURST: |
3460 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); |
3461 | break; |
3462 | case SCTP_AUTH_CHUNK: |
3463 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); |
3464 | break; |
3465 | case SCTP_HMAC_IDENT: |
3466 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); |
3467 | break; |
3468 | case SCTP_AUTH_KEY: |
3469 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); |
3470 | break; |
3471 | case SCTP_AUTH_ACTIVE_KEY: |
3472 | retval = sctp_setsockopt_active_key(sk, optval, optlen); |
3473 | break; |
3474 | case SCTP_AUTH_DELETE_KEY: |
3475 | retval = sctp_setsockopt_del_key(sk, optval, optlen); |
3476 | break; |
3477 | default: |
3478 | retval = -ENOPROTOOPT; |
3479 | break; |
3480 | } |
3481 | |
3482 | sctp_release_sock(sk); |
3483 | |
3484 | out_nounlock: |
3485 | return retval; |
3486 | } |
3487 | |
3488 | /* API 3.1.6 connect() - UDP Style Syntax |
3489 | * |
3490 | * An application may use the connect() call in the UDP model to initiate an |
3491 | * association without sending data. |
3492 | * |
3493 | * The syntax is: |
3494 | * |
3495 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); |
3496 | * |
3497 | * sd: the socket descriptor to have a new association added to. |
3498 | * |
3499 | * nam: the address structure (either struct sockaddr_in or struct |
3500 | * sockaddr_in6 defined in RFC2553 [7]). |
3501 | * |
3502 | * len: the size of the address. |
3503 | */ |
3504 | SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr, |
3505 | int addr_len) |
3506 | { |
3507 | int err = 0; |
3508 | struct sctp_af *af; |
3509 | |
3510 | sctp_lock_sock(sk); |
3511 | |
3512 | SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n", |
3513 | __func__, sk, addr, addr_len); |
3514 | |
3515 | /* Validate addr_len before calling common connect/connectx routine. */ |
3516 | af = sctp_get_af_specific(addr->sa_family); |
3517 | if (!af || addr_len < af->sockaddr_len) { |
3518 | err = -EINVAL; |
3519 | } else { |
3520 | /* Pass correct addr len to common routine (so it knows there |
3521 | * is only one address being passed. |
3522 | */ |
3523 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
3524 | } |
3525 | |
3526 | sctp_release_sock(sk); |
3527 | return err; |
3528 | } |
3529 | |
3530 | /* FIXME: Write comments. */ |
3531 | SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags) |
3532 | { |
3533 | return -EOPNOTSUPP; /* STUB */ |
3534 | } |
3535 | |
3536 | /* 4.1.4 accept() - TCP Style Syntax |
3537 | * |
3538 | * Applications use accept() call to remove an established SCTP |
3539 | * association from the accept queue of the endpoint. A new socket |
3540 | * descriptor will be returned from accept() to represent the newly |
3541 | * formed association. |
3542 | */ |
3543 | SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err) |
3544 | { |
3545 | struct sctp_sock *sp; |
3546 | struct sctp_endpoint *ep; |
3547 | struct sock *newsk = NULL; |
3548 | struct sctp_association *asoc; |
3549 | long timeo; |
3550 | int error = 0; |
3551 | |
3552 | sctp_lock_sock(sk); |
3553 | |
3554 | sp = sctp_sk(sk); |
3555 | ep = sp->ep; |
3556 | |
3557 | if (!sctp_style(sk, TCP)) { |
3558 | error = -EOPNOTSUPP; |
3559 | goto out; |
3560 | } |
3561 | |
3562 | if (!sctp_sstate(sk, LISTENING)) { |
3563 | error = -EINVAL; |
3564 | goto out; |
3565 | } |
3566 | |
3567 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
3568 | |
3569 | error = sctp_wait_for_accept(sk, timeo); |
3570 | if (error) |
3571 | goto out; |
3572 | |
3573 | /* We treat the list of associations on the endpoint as the accept |
3574 | * queue and pick the first association on the list. |
3575 | */ |
3576 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); |
3577 | |
3578 | newsk = sp->pf->create_accept_sk(sk, asoc); |
3579 | if (!newsk) { |
3580 | error = -ENOMEM; |
3581 | goto out; |
3582 | } |
3583 | |
3584 | /* Populate the fields of the newsk from the oldsk and migrate the |
3585 | * asoc to the newsk. |
3586 | */ |
3587 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); |
3588 | |
3589 | out: |
3590 | sctp_release_sock(sk); |
3591 | *err = error; |
3592 | return newsk; |
3593 | } |
3594 | |
3595 | /* The SCTP ioctl handler. */ |
3596 | SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
3597 | { |
3598 | return -ENOIOCTLCMD; |
3599 | } |
3600 | |
3601 | /* This is the function which gets called during socket creation to |
3602 | * initialized the SCTP-specific portion of the sock. |
3603 | * The sock structure should already be zero-filled memory. |
3604 | */ |
3605 | SCTP_STATIC int sctp_init_sock(struct sock *sk) |
3606 | { |
3607 | struct sctp_endpoint *ep; |
3608 | struct sctp_sock *sp; |
3609 | |
3610 | SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk); |
3611 | |
3612 | sp = sctp_sk(sk); |
3613 | |
3614 | /* Initialize the SCTP per socket area. */ |
3615 | switch (sk->sk_type) { |
3616 | case SOCK_SEQPACKET: |
3617 | sp->type = SCTP_SOCKET_UDP; |
3618 | break; |
3619 | case SOCK_STREAM: |
3620 | sp->type = SCTP_SOCKET_TCP; |
3621 | break; |
3622 | default: |
3623 | return -ESOCKTNOSUPPORT; |
3624 | } |
3625 | |
3626 | /* Initialize default send parameters. These parameters can be |
3627 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. |
3628 | */ |
3629 | sp->default_stream = 0; |
3630 | sp->default_ppid = 0; |
3631 | sp->default_flags = 0; |
3632 | sp->default_context = 0; |
3633 | sp->default_timetolive = 0; |
3634 | |
3635 | sp->default_rcv_context = 0; |
3636 | sp->max_burst = sctp_max_burst; |
3637 | |
3638 | /* Initialize default setup parameters. These parameters |
3639 | * can be modified with the SCTP_INITMSG socket option or |
3640 | * overridden by the SCTP_INIT CMSG. |
3641 | */ |
3642 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; |
3643 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; |
3644 | sp->initmsg.sinit_max_attempts = sctp_max_retrans_init; |
3645 | sp->initmsg.sinit_max_init_timeo = sctp_rto_max; |
3646 | |
3647 | /* Initialize default RTO related parameters. These parameters can |
3648 | * be modified for with the SCTP_RTOINFO socket option. |
3649 | */ |
3650 | sp->rtoinfo.srto_initial = sctp_rto_initial; |
3651 | sp->rtoinfo.srto_max = sctp_rto_max; |
3652 | sp->rtoinfo.srto_min = sctp_rto_min; |
3653 | |
3654 | /* Initialize default association related parameters. These parameters |
3655 | * can be modified with the SCTP_ASSOCINFO socket option. |
3656 | */ |
3657 | sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association; |
3658 | sp->assocparams.sasoc_number_peer_destinations = 0; |
3659 | sp->assocparams.sasoc_peer_rwnd = 0; |
3660 | sp->assocparams.sasoc_local_rwnd = 0; |
3661 | sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life; |
3662 | |
3663 | /* Initialize default event subscriptions. By default, all the |
3664 | * options are off. |
3665 | */ |
3666 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); |
3667 | |
3668 | /* Default Peer Address Parameters. These defaults can |
3669 | * be modified via SCTP_PEER_ADDR_PARAMS |
3670 | */ |
3671 | sp->hbinterval = sctp_hb_interval; |
3672 | sp->pathmaxrxt = sctp_max_retrans_path; |
3673 | sp->pathmtu = 0; // allow default discovery |
3674 | sp->sackdelay = sctp_sack_timeout; |
3675 | sp->sackfreq = 2; |
3676 | sp->param_flags = SPP_HB_ENABLE | |
3677 | SPP_PMTUD_ENABLE | |
3678 | SPP_SACKDELAY_ENABLE; |
3679 | |
3680 | /* If enabled no SCTP message fragmentation will be performed. |
3681 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. |
3682 | */ |
3683 | sp->disable_fragments = 0; |
3684 | |
3685 | /* Enable Nagle algorithm by default. */ |
3686 | sp->nodelay = 0; |
3687 | |
3688 | /* Enable by default. */ |
3689 | sp->v4mapped = 1; |
3690 | |
3691 | /* Auto-close idle associations after the configured |
3692 | * number of seconds. A value of 0 disables this |
3693 | * feature. Configure through the SCTP_AUTOCLOSE socket option, |
3694 | * for UDP-style sockets only. |
3695 | */ |
3696 | sp->autoclose = 0; |
3697 | |
3698 | /* User specified fragmentation limit. */ |
3699 | sp->user_frag = 0; |
3700 | |
3701 | sp->adaptation_ind = 0; |
3702 | |
3703 | sp->pf = sctp_get_pf_specific(sk->sk_family); |
3704 | |
3705 | /* Control variables for partial data delivery. */ |
3706 | atomic_set(&sp->pd_mode, 0); |
3707 | skb_queue_head_init(&sp->pd_lobby); |
3708 | sp->frag_interleave = 0; |
3709 | |
3710 | /* Create a per socket endpoint structure. Even if we |
3711 | * change the data structure relationships, this may still |
3712 | * be useful for storing pre-connect address information. |
3713 | */ |
3714 | ep = sctp_endpoint_new(sk, GFP_KERNEL); |
3715 | if (!ep) |
3716 | return -ENOMEM; |
3717 | |
3718 | sp->ep = ep; |
3719 | sp->hmac = NULL; |
3720 | |
3721 | SCTP_DBG_OBJCNT_INC(sock); |
3722 | |
3723 | /* Set socket backlog limit. */ |
3724 | sk->sk_backlog.limit = sysctl_sctp_rmem[1]; |
3725 | |
3726 | local_bh_disable(); |
3727 | percpu_counter_inc(&sctp_sockets_allocated); |
3728 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
3729 | local_bh_enable(); |
3730 | |
3731 | return 0; |
3732 | } |
3733 | |
3734 | /* Cleanup any SCTP per socket resources. */ |
3735 | SCTP_STATIC void sctp_destroy_sock(struct sock *sk) |
3736 | { |
3737 | struct sctp_endpoint *ep; |
3738 | |
3739 | SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk); |
3740 | |
3741 | /* Release our hold on the endpoint. */ |
3742 | ep = sctp_sk(sk)->ep; |
3743 | sctp_endpoint_free(ep); |
3744 | local_bh_disable(); |
3745 | percpu_counter_dec(&sctp_sockets_allocated); |
3746 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
3747 | local_bh_enable(); |
3748 | } |
3749 | |
3750 | /* API 4.1.7 shutdown() - TCP Style Syntax |
3751 | * int shutdown(int socket, int how); |
3752 | * |
3753 | * sd - the socket descriptor of the association to be closed. |
3754 | * how - Specifies the type of shutdown. The values are |
3755 | * as follows: |
3756 | * SHUT_RD |
3757 | * Disables further receive operations. No SCTP |
3758 | * protocol action is taken. |
3759 | * SHUT_WR |
3760 | * Disables further send operations, and initiates |
3761 | * the SCTP shutdown sequence. |
3762 | * SHUT_RDWR |
3763 | * Disables further send and receive operations |
3764 | * and initiates the SCTP shutdown sequence. |
3765 | */ |
3766 | SCTP_STATIC void sctp_shutdown(struct sock *sk, int how) |
3767 | { |
3768 | struct sctp_endpoint *ep; |
3769 | struct sctp_association *asoc; |
3770 | |
3771 | if (!sctp_style(sk, TCP)) |
3772 | return; |
3773 | |
3774 | if (how & SEND_SHUTDOWN) { |
3775 | ep = sctp_sk(sk)->ep; |
3776 | if (!list_empty(&ep->asocs)) { |
3777 | asoc = list_entry(ep->asocs.next, |
3778 | struct sctp_association, asocs); |
3779 | sctp_primitive_SHUTDOWN(asoc, NULL); |
3780 | } |
3781 | } |
3782 | } |
3783 | |
3784 | /* 7.2.1 Association Status (SCTP_STATUS) |
3785 | |
3786 | * Applications can retrieve current status information about an |
3787 | * association, including association state, peer receiver window size, |
3788 | * number of unacked data chunks, and number of data chunks pending |
3789 | * receipt. This information is read-only. |
3790 | */ |
3791 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, |
3792 | char __user *optval, |
3793 | int __user *optlen) |
3794 | { |
3795 | struct sctp_status status; |
3796 | struct sctp_association *asoc = NULL; |
3797 | struct sctp_transport *transport; |
3798 | sctp_assoc_t associd; |
3799 | int retval = 0; |
3800 | |
3801 | if (len < sizeof(status)) { |
3802 | retval = -EINVAL; |
3803 | goto out; |
3804 | } |
3805 | |
3806 | len = sizeof(status); |
3807 | if (copy_from_user(&status, optval, len)) { |
3808 | retval = -EFAULT; |
3809 | goto out; |
3810 | } |
3811 | |
3812 | associd = status.sstat_assoc_id; |
3813 | asoc = sctp_id2assoc(sk, associd); |
3814 | if (!asoc) { |
3815 | retval = -EINVAL; |
3816 | goto out; |
3817 | } |
3818 | |
3819 | transport = asoc->peer.primary_path; |
3820 | |
3821 | status.sstat_assoc_id = sctp_assoc2id(asoc); |
3822 | status.sstat_state = asoc->state; |
3823 | status.sstat_rwnd = asoc->peer.rwnd; |
3824 | status.sstat_unackdata = asoc->unack_data; |
3825 | |
3826 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); |
3827 | status.sstat_instrms = asoc->c.sinit_max_instreams; |
3828 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; |
3829 | status.sstat_fragmentation_point = asoc->frag_point; |
3830 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); |
3831 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
3832 | transport->af_specific->sockaddr_len); |
3833 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
3834 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), |
3835 | (union sctp_addr *)&status.sstat_primary.spinfo_address); |
3836 | status.sstat_primary.spinfo_state = transport->state; |
3837 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
3838 | status.sstat_primary.spinfo_srtt = transport->srtt; |
3839 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); |
3840 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
3841 | |
3842 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
3843 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; |
3844 | |
3845 | if (put_user(len, optlen)) { |
3846 | retval = -EFAULT; |
3847 | goto out; |
3848 | } |
3849 | |
3850 | SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n", |
3851 | len, status.sstat_state, status.sstat_rwnd, |
3852 | status.sstat_assoc_id); |
3853 | |
3854 | if (copy_to_user(optval, &status, len)) { |
3855 | retval = -EFAULT; |
3856 | goto out; |
3857 | } |
3858 | |
3859 | out: |
3860 | return (retval); |
3861 | } |
3862 | |
3863 | |
3864 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) |
3865 | * |
3866 | * Applications can retrieve information about a specific peer address |
3867 | * of an association, including its reachability state, congestion |
3868 | * window, and retransmission timer values. This information is |
3869 | * read-only. |
3870 | */ |
3871 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, |
3872 | char __user *optval, |
3873 | int __user *optlen) |
3874 | { |
3875 | struct sctp_paddrinfo pinfo; |
3876 | struct sctp_transport *transport; |
3877 | int retval = 0; |
3878 | |
3879 | if (len < sizeof(pinfo)) { |
3880 | retval = -EINVAL; |
3881 | goto out; |
3882 | } |
3883 | |
3884 | len = sizeof(pinfo); |
3885 | if (copy_from_user(&pinfo, optval, len)) { |
3886 | retval = -EFAULT; |
3887 | goto out; |
3888 | } |
3889 | |
3890 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, |
3891 | pinfo.spinfo_assoc_id); |
3892 | if (!transport) |
3893 | return -EINVAL; |
3894 | |
3895 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); |
3896 | pinfo.spinfo_state = transport->state; |
3897 | pinfo.spinfo_cwnd = transport->cwnd; |
3898 | pinfo.spinfo_srtt = transport->srtt; |
3899 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); |
3900 | pinfo.spinfo_mtu = transport->pathmtu; |
3901 | |
3902 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
3903 | pinfo.spinfo_state = SCTP_ACTIVE; |
3904 | |
3905 | if (put_user(len, optlen)) { |
3906 | retval = -EFAULT; |
3907 | goto out; |
3908 | } |
3909 | |
3910 | if (copy_to_user(optval, &pinfo, len)) { |
3911 | retval = -EFAULT; |
3912 | goto out; |
3913 | } |
3914 | |
3915 | out: |
3916 | return (retval); |
3917 | } |
3918 | |
3919 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) |
3920 | * |
3921 | * This option is a on/off flag. If enabled no SCTP message |
3922 | * fragmentation will be performed. Instead if a message being sent |
3923 | * exceeds the current PMTU size, the message will NOT be sent and |
3924 | * instead a error will be indicated to the user. |
3925 | */ |
3926 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, |
3927 | char __user *optval, int __user *optlen) |
3928 | { |
3929 | int val; |
3930 | |
3931 | if (len < sizeof(int)) |
3932 | return -EINVAL; |
3933 | |
3934 | len = sizeof(int); |
3935 | val = (sctp_sk(sk)->disable_fragments == 1); |
3936 | if (put_user(len, optlen)) |
3937 | return -EFAULT; |
3938 | if (copy_to_user(optval, &val, len)) |
3939 | return -EFAULT; |
3940 | return 0; |
3941 | } |
3942 | |
3943 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) |
3944 | * |
3945 | * This socket option is used to specify various notifications and |
3946 | * ancillary data the user wishes to receive. |
3947 | */ |
3948 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, |
3949 | int __user *optlen) |
3950 | { |
3951 | if (len < sizeof(struct sctp_event_subscribe)) |
3952 | return -EINVAL; |
3953 | len = sizeof(struct sctp_event_subscribe); |
3954 | if (put_user(len, optlen)) |
3955 | return -EFAULT; |
3956 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
3957 | return -EFAULT; |
3958 | return 0; |
3959 | } |
3960 | |
3961 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) |
3962 | * |
3963 | * This socket option is applicable to the UDP-style socket only. When |
3964 | * set it will cause associations that are idle for more than the |
3965 | * specified number of seconds to automatically close. An association |
3966 | * being idle is defined an association that has NOT sent or received |
3967 | * user data. The special value of '0' indicates that no automatic |
3968 | * close of any associations should be performed. The option expects an |
3969 | * integer defining the number of seconds of idle time before an |
3970 | * association is closed. |
3971 | */ |
3972 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) |
3973 | { |
3974 | /* Applicable to UDP-style socket only */ |
3975 | if (sctp_style(sk, TCP)) |
3976 | return -EOPNOTSUPP; |
3977 | if (len < sizeof(int)) |
3978 | return -EINVAL; |
3979 | len = sizeof(int); |
3980 | if (put_user(len, optlen)) |
3981 | return -EFAULT; |
3982 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) |
3983 | return -EFAULT; |
3984 | return 0; |
3985 | } |
3986 | |
3987 | /* Helper routine to branch off an association to a new socket. */ |
3988 | SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc, |
3989 | struct socket **sockp) |
3990 | { |
3991 | struct sock *sk = asoc->base.sk; |
3992 | struct socket *sock; |
3993 | struct sctp_af *af; |
3994 | int err = 0; |
3995 | |
3996 | /* An association cannot be branched off from an already peeled-off |
3997 | * socket, nor is this supported for tcp style sockets. |
3998 | */ |
3999 | if (!sctp_style(sk, UDP)) |
4000 | return -EINVAL; |
4001 | |
4002 | /* Create a new socket. */ |
4003 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); |
4004 | if (err < 0) |
4005 | return err; |
4006 | |
4007 | sctp_copy_sock(sock->sk, sk, asoc); |
4008 | |
4009 | /* Make peeled-off sockets more like 1-1 accepted sockets. |
4010 | * Set the daddr and initialize id to something more random |
4011 | */ |
4012 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4013 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); |
4014 | |
4015 | /* Populate the fields of the newsk from the oldsk and migrate the |
4016 | * asoc to the newsk. |
4017 | */ |
4018 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); |
4019 | |
4020 | *sockp = sock; |
4021 | |
4022 | return err; |
4023 | } |
4024 | |
4025 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) |
4026 | { |
4027 | sctp_peeloff_arg_t peeloff; |
4028 | struct socket *newsock; |
4029 | int retval = 0; |
4030 | struct sctp_association *asoc; |
4031 | |
4032 | if (len < sizeof(sctp_peeloff_arg_t)) |
4033 | return -EINVAL; |
4034 | len = sizeof(sctp_peeloff_arg_t); |
4035 | if (copy_from_user(&peeloff, optval, len)) |
4036 | return -EFAULT; |
4037 | |
4038 | asoc = sctp_id2assoc(sk, peeloff.associd); |
4039 | if (!asoc) { |
4040 | retval = -EINVAL; |
4041 | goto out; |
4042 | } |
4043 | |
4044 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc); |
4045 | |
4046 | retval = sctp_do_peeloff(asoc, &newsock); |
4047 | if (retval < 0) |
4048 | goto out; |
4049 | |
4050 | /* Map the socket to an unused fd that can be returned to the user. */ |
4051 | retval = sock_map_fd(newsock, 0); |
4052 | if (retval < 0) { |
4053 | sock_release(newsock); |
4054 | goto out; |
4055 | } |
4056 | |
4057 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n", |
4058 | __func__, sk, asoc, newsock->sk, retval); |
4059 | |
4060 | /* Return the fd mapped to the new socket. */ |
4061 | peeloff.sd = retval; |
4062 | if (put_user(len, optlen)) |
4063 | return -EFAULT; |
4064 | if (copy_to_user(optval, &peeloff, len)) |
4065 | retval = -EFAULT; |
4066 | |
4067 | out: |
4068 | return retval; |
4069 | } |
4070 | |
4071 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) |
4072 | * |
4073 | * Applications can enable or disable heartbeats for any peer address of |
4074 | * an association, modify an address's heartbeat interval, force a |
4075 | * heartbeat to be sent immediately, and adjust the address's maximum |
4076 | * number of retransmissions sent before an address is considered |
4077 | * unreachable. The following structure is used to access and modify an |
4078 | * address's parameters: |
4079 | * |
4080 | * struct sctp_paddrparams { |
4081 | * sctp_assoc_t spp_assoc_id; |
4082 | * struct sockaddr_storage spp_address; |
4083 | * uint32_t spp_hbinterval; |
4084 | * uint16_t spp_pathmaxrxt; |
4085 | * uint32_t spp_pathmtu; |
4086 | * uint32_t spp_sackdelay; |
4087 | * uint32_t spp_flags; |
4088 | * }; |
4089 | * |
4090 | * spp_assoc_id - (one-to-many style socket) This is filled in the |
4091 | * application, and identifies the association for |
4092 | * this query. |
4093 | * spp_address - This specifies which address is of interest. |
4094 | * spp_hbinterval - This contains the value of the heartbeat interval, |
4095 | * in milliseconds. If a value of zero |
4096 | * is present in this field then no changes are to |
4097 | * be made to this parameter. |
4098 | * spp_pathmaxrxt - This contains the maximum number of |
4099 | * retransmissions before this address shall be |
4100 | * considered unreachable. If a value of zero |
4101 | * is present in this field then no changes are to |
4102 | * be made to this parameter. |
4103 | * spp_pathmtu - When Path MTU discovery is disabled the value |
4104 | * specified here will be the "fixed" path mtu. |
4105 | * Note that if the spp_address field is empty |
4106 | * then all associations on this address will |
4107 | * have this fixed path mtu set upon them. |
4108 | * |
4109 | * spp_sackdelay - When delayed sack is enabled, this value specifies |
4110 | * the number of milliseconds that sacks will be delayed |
4111 | * for. This value will apply to all addresses of an |
4112 | * association if the spp_address field is empty. Note |
4113 | * also, that if delayed sack is enabled and this |
4114 | * value is set to 0, no change is made to the last |
4115 | * recorded delayed sack timer value. |
4116 | * |
4117 | * spp_flags - These flags are used to control various features |
4118 | * on an association. The flag field may contain |
4119 | * zero or more of the following options. |
4120 | * |
4121 | * SPP_HB_ENABLE - Enable heartbeats on the |
4122 | * specified address. Note that if the address |
4123 | * field is empty all addresses for the association |
4124 | * have heartbeats enabled upon them. |
4125 | * |
4126 | * SPP_HB_DISABLE - Disable heartbeats on the |
4127 | * speicifed address. Note that if the address |
4128 | * field is empty all addresses for the association |
4129 | * will have their heartbeats disabled. Note also |
4130 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are |
4131 | * mutually exclusive, only one of these two should |
4132 | * be specified. Enabling both fields will have |
4133 | * undetermined results. |
4134 | * |
4135 | * SPP_HB_DEMAND - Request a user initiated heartbeat |
4136 | * to be made immediately. |
4137 | * |
4138 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
4139 | * discovery upon the specified address. Note that |
4140 | * if the address feild is empty then all addresses |
4141 | * on the association are effected. |
4142 | * |
4143 | * SPP_PMTUD_DISABLE - This field will disable PMTU |
4144 | * discovery upon the specified address. Note that |
4145 | * if the address feild is empty then all addresses |
4146 | * on the association are effected. Not also that |
4147 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually |
4148 | * exclusive. Enabling both will have undetermined |
4149 | * results. |
4150 | * |
4151 | * SPP_SACKDELAY_ENABLE - Setting this flag turns |
4152 | * on delayed sack. The time specified in spp_sackdelay |
4153 | * is used to specify the sack delay for this address. Note |
4154 | * that if spp_address is empty then all addresses will |
4155 | * enable delayed sack and take on the sack delay |
4156 | * value specified in spp_sackdelay. |
4157 | * SPP_SACKDELAY_DISABLE - Setting this flag turns |
4158 | * off delayed sack. If the spp_address field is blank then |
4159 | * delayed sack is disabled for the entire association. Note |
4160 | * also that this field is mutually exclusive to |
4161 | * SPP_SACKDELAY_ENABLE, setting both will have undefined |
4162 | * results. |
4163 | */ |
4164 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, |
4165 | char __user *optval, int __user *optlen) |
4166 | { |
4167 | struct sctp_paddrparams params; |
4168 | struct sctp_transport *trans = NULL; |
4169 | struct sctp_association *asoc = NULL; |
4170 | struct sctp_sock *sp = sctp_sk(sk); |
4171 | |
4172 | if (len < sizeof(struct sctp_paddrparams)) |
4173 | return -EINVAL; |
4174 | len = sizeof(struct sctp_paddrparams); |
4175 | if (copy_from_user(¶ms, optval, len)) |
4176 | return -EFAULT; |
4177 | |
4178 | /* If an address other than INADDR_ANY is specified, and |
4179 | * no transport is found, then the request is invalid. |
4180 | */ |
4181 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
4182 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4183 | params.spp_assoc_id); |
4184 | if (!trans) { |
4185 | SCTP_DEBUG_PRINTK("Failed no transport\n"); |
4186 | return -EINVAL; |
4187 | } |
4188 | } |
4189 | |
4190 | /* Get association, if assoc_id != 0 and the socket is a one |
4191 | * to many style socket, and an association was not found, then |
4192 | * the id was invalid. |
4193 | */ |
4194 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); |
4195 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { |
4196 | SCTP_DEBUG_PRINTK("Failed no association\n"); |
4197 | return -EINVAL; |
4198 | } |
4199 | |
4200 | if (trans) { |
4201 | /* Fetch transport values. */ |
4202 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); |
4203 | params.spp_pathmtu = trans->pathmtu; |
4204 | params.spp_pathmaxrxt = trans->pathmaxrxt; |
4205 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); |
4206 | |
4207 | /*draft-11 doesn't say what to return in spp_flags*/ |
4208 | params.spp_flags = trans->param_flags; |
4209 | } else if (asoc) { |
4210 | /* Fetch association values. */ |
4211 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); |
4212 | params.spp_pathmtu = asoc->pathmtu; |
4213 | params.spp_pathmaxrxt = asoc->pathmaxrxt; |
4214 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); |
4215 | |
4216 | /*draft-11 doesn't say what to return in spp_flags*/ |
4217 | params.spp_flags = asoc->param_flags; |
4218 | } else { |
4219 | /* Fetch socket values. */ |
4220 | params.spp_hbinterval = sp->hbinterval; |
4221 | params.spp_pathmtu = sp->pathmtu; |
4222 | params.spp_sackdelay = sp->sackdelay; |
4223 | params.spp_pathmaxrxt = sp->pathmaxrxt; |
4224 | |
4225 | /*draft-11 doesn't say what to return in spp_flags*/ |
4226 | params.spp_flags = sp->param_flags; |
4227 | } |
4228 | |
4229 | if (copy_to_user(optval, ¶ms, len)) |
4230 | return -EFAULT; |
4231 | |
4232 | if (put_user(len, optlen)) |
4233 | return -EFAULT; |
4234 | |
4235 | return 0; |
4236 | } |
4237 | |
4238 | /* |
4239 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) |
4240 | * |
4241 | * This option will effect the way delayed acks are performed. This |
4242 | * option allows you to get or set the delayed ack time, in |
4243 | * milliseconds. It also allows changing the delayed ack frequency. |
4244 | * Changing the frequency to 1 disables the delayed sack algorithm. If |
4245 | * the assoc_id is 0, then this sets or gets the endpoints default |
4246 | * values. If the assoc_id field is non-zero, then the set or get |
4247 | * effects the specified association for the one to many model (the |
4248 | * assoc_id field is ignored by the one to one model). Note that if |
4249 | * sack_delay or sack_freq are 0 when setting this option, then the |
4250 | * current values will remain unchanged. |
4251 | * |
4252 | * struct sctp_sack_info { |
4253 | * sctp_assoc_t sack_assoc_id; |
4254 | * uint32_t sack_delay; |
4255 | * uint32_t sack_freq; |
4256 | * }; |
4257 | * |
4258 | * sack_assoc_id - This parameter, indicates which association the user |
4259 | * is performing an action upon. Note that if this field's value is |
4260 | * zero then the endpoints default value is changed (effecting future |
4261 | * associations only). |
4262 | * |
4263 | * sack_delay - This parameter contains the number of milliseconds that |
4264 | * the user is requesting the delayed ACK timer be set to. Note that |
4265 | * this value is defined in the standard to be between 200 and 500 |
4266 | * milliseconds. |
4267 | * |
4268 | * sack_freq - This parameter contains the number of packets that must |
4269 | * be received before a sack is sent without waiting for the delay |
4270 | * timer to expire. The default value for this is 2, setting this |
4271 | * value to 1 will disable the delayed sack algorithm. |
4272 | */ |
4273 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
4274 | char __user *optval, |
4275 | int __user *optlen) |
4276 | { |
4277 | struct sctp_sack_info params; |
4278 | struct sctp_association *asoc = NULL; |
4279 | struct sctp_sock *sp = sctp_sk(sk); |
4280 | |
4281 | if (len >= sizeof(struct sctp_sack_info)) { |
4282 | len = sizeof(struct sctp_sack_info); |
4283 | |
4284 | if (copy_from_user(¶ms, optval, len)) |
4285 | return -EFAULT; |
4286 | } else if (len == sizeof(struct sctp_assoc_value)) { |
4287 | printk(KERN_WARNING "SCTP: Use of struct sctp_assoc_value " |
4288 | "in delayed_ack socket option deprecated\n"); |
4289 | printk(KERN_WARNING "SCTP: Use struct sctp_sack_info instead\n"); |
4290 | if (copy_from_user(¶ms, optval, len)) |
4291 | return -EFAULT; |
4292 | } else |
4293 | return - EINVAL; |
4294 | |
4295 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
4296 | * to many style socket, and an association was not found, then |
4297 | * the id was invalid. |
4298 | */ |
4299 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4300 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) |
4301 | return -EINVAL; |
4302 | |
4303 | if (asoc) { |
4304 | /* Fetch association values. */ |
4305 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4306 | params.sack_delay = jiffies_to_msecs( |
4307 | asoc->sackdelay); |
4308 | params.sack_freq = asoc->sackfreq; |
4309 | |
4310 | } else { |
4311 | params.sack_delay = 0; |
4312 | params.sack_freq = 1; |
4313 | } |
4314 | } else { |
4315 | /* Fetch socket values. */ |
4316 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4317 | params.sack_delay = sp->sackdelay; |
4318 | params.sack_freq = sp->sackfreq; |
4319 | } else { |
4320 | params.sack_delay = 0; |
4321 | params.sack_freq = 1; |
4322 | } |
4323 | } |
4324 | |
4325 | if (copy_to_user(optval, ¶ms, len)) |
4326 | return -EFAULT; |
4327 | |
4328 | if (put_user(len, optlen)) |
4329 | return -EFAULT; |
4330 | |
4331 | return 0; |
4332 | } |
4333 | |
4334 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4335 | * |
4336 | * Applications can specify protocol parameters for the default association |
4337 | * initialization. The option name argument to setsockopt() and getsockopt() |
4338 | * is SCTP_INITMSG. |
4339 | * |
4340 | * Setting initialization parameters is effective only on an unconnected |
4341 | * socket (for UDP-style sockets only future associations are effected |
4342 | * by the change). With TCP-style sockets, this option is inherited by |
4343 | * sockets derived from a listener socket. |
4344 | */ |
4345 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) |
4346 | { |
4347 | if (len < sizeof(struct sctp_initmsg)) |
4348 | return -EINVAL; |
4349 | len = sizeof(struct sctp_initmsg); |
4350 | if (put_user(len, optlen)) |
4351 | return -EFAULT; |
4352 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4353 | return -EFAULT; |
4354 | return 0; |
4355 | } |
4356 | |
4357 | |
4358 | static int sctp_getsockopt_peer_addrs(struct sock *sk, int len, |
4359 | char __user *optval, int __user *optlen) |
4360 | { |
4361 | struct sctp_association *asoc; |
4362 | int cnt = 0; |
4363 | struct sctp_getaddrs getaddrs; |
4364 | struct sctp_transport *from; |
4365 | void __user *to; |
4366 | union sctp_addr temp; |
4367 | struct sctp_sock *sp = sctp_sk(sk); |
4368 | int addrlen; |
4369 | size_t space_left; |
4370 | int bytes_copied; |
4371 | |
4372 | if (len < sizeof(struct sctp_getaddrs)) |
4373 | return -EINVAL; |
4374 | |
4375 | if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs))) |
4376 | return -EFAULT; |
4377 | |
4378 | /* For UDP-style sockets, id specifies the association to query. */ |
4379 | asoc = sctp_id2assoc(sk, getaddrs.assoc_id); |
4380 | if (!asoc) |
4381 | return -EINVAL; |
4382 | |
4383 | to = optval + offsetof(struct sctp_getaddrs,addrs); |
4384 | space_left = len - offsetof(struct sctp_getaddrs,addrs); |
4385 | |
4386 | list_for_each_entry(from, &asoc->peer.transport_addr_list, |
4387 | transports) { |
4388 | memcpy(&temp, &from->ipaddr, sizeof(temp)); |
4389 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp); |
4390 | addrlen = sctp_get_af_specific(sk->sk_family)->sockaddr_len; |
4391 | if (space_left < addrlen) |
4392 | return -ENOMEM; |
4393 | if (copy_to_user(to, &temp, addrlen)) |
4394 | return -EFAULT; |
4395 | to += addrlen; |
4396 | cnt++; |
4397 | space_left -= addrlen; |
4398 | } |
4399 | |
4400 | if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) |
4401 | return -EFAULT; |
4402 | bytes_copied = ((char __user *)to) - optval; |
4403 | if (put_user(bytes_copied, optlen)) |
4404 | return -EFAULT; |
4405 | |
4406 | return 0; |
4407 | } |
4408 | |
4409 | static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to, |
4410 | size_t space_left, int *bytes_copied) |
4411 | { |
4412 | struct sctp_sockaddr_entry *addr; |
4413 | union sctp_addr temp; |
4414 | int cnt = 0; |
4415 | int addrlen; |
4416 | |
4417 | rcu_read_lock(); |
4418 | list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { |
4419 | if (!addr->valid) |
4420 | continue; |
4421 | |
4422 | if ((PF_INET == sk->sk_family) && |
4423 | (AF_INET6 == addr->a.sa.sa_family)) |
4424 | continue; |
4425 | if ((PF_INET6 == sk->sk_family) && |
4426 | inet_v6_ipv6only(sk) && |
4427 | (AF_INET == addr->a.sa.sa_family)) |
4428 | continue; |
4429 | memcpy(&temp, &addr->a, sizeof(temp)); |
4430 | if (!temp.v4.sin_port) |
4431 | temp.v4.sin_port = htons(port); |
4432 | |
4433 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), |
4434 | &temp); |
4435 | addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len; |
4436 | if (space_left < addrlen) { |
4437 | cnt = -ENOMEM; |
4438 | break; |
4439 | } |
4440 | memcpy(to, &temp, addrlen); |
4441 | |
4442 | to += addrlen; |
4443 | cnt ++; |
4444 | space_left -= addrlen; |
4445 | *bytes_copied += addrlen; |
4446 | } |
4447 | rcu_read_unlock(); |
4448 | |
4449 | return cnt; |
4450 | } |
4451 | |
4452 | |
4453 | static int sctp_getsockopt_local_addrs(struct sock *sk, int len, |
4454 | char __user *optval, int __user *optlen) |
4455 | { |
4456 | struct sctp_bind_addr *bp; |
4457 | struct sctp_association *asoc; |
4458 | int cnt = 0; |
4459 | struct sctp_getaddrs getaddrs; |
4460 | struct sctp_sockaddr_entry *addr; |
4461 | void __user *to; |
4462 | union sctp_addr temp; |
4463 | struct sctp_sock *sp = sctp_sk(sk); |
4464 | int addrlen; |
4465 | int err = 0; |
4466 | size_t space_left; |
4467 | int bytes_copied = 0; |
4468 | void *addrs; |
4469 | void *buf; |
4470 | |
4471 | if (len < sizeof(struct sctp_getaddrs)) |
4472 | return -EINVAL; |
4473 | |
4474 | if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs))) |
4475 | return -EFAULT; |
4476 | |
4477 | /* |
4478 | * For UDP-style sockets, id specifies the association to query. |
4479 | * If the id field is set to the value '0' then the locally bound |
4480 | * addresses are returned without regard to any particular |
4481 | * association. |
4482 | */ |
4483 | if (0 == getaddrs.assoc_id) { |
4484 | bp = &sctp_sk(sk)->ep->base.bind_addr; |
4485 | } else { |
4486 | asoc = sctp_id2assoc(sk, getaddrs.assoc_id); |
4487 | if (!asoc) |
4488 | return -EINVAL; |
4489 | bp = &asoc->base.bind_addr; |
4490 | } |
4491 | |
4492 | to = optval + offsetof(struct sctp_getaddrs,addrs); |
4493 | space_left = len - offsetof(struct sctp_getaddrs,addrs); |
4494 | |
4495 | addrs = kmalloc(space_left, GFP_KERNEL); |
4496 | if (!addrs) |
4497 | return -ENOMEM; |
4498 | |
4499 | /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid |
4500 | * addresses from the global local address list. |
4501 | */ |
4502 | if (sctp_list_single_entry(&bp->address_list)) { |
4503 | addr = list_entry(bp->address_list.next, |
4504 | struct sctp_sockaddr_entry, list); |
4505 | if (sctp_is_any(sk, &addr->a)) { |
4506 | cnt = sctp_copy_laddrs(sk, bp->port, addrs, |
4507 | space_left, &bytes_copied); |
4508 | if (cnt < 0) { |
4509 | err = cnt; |
4510 | goto out; |
4511 | } |
4512 | goto copy_getaddrs; |
4513 | } |
4514 | } |
4515 | |
4516 | buf = addrs; |
4517 | /* Protection on the bound address list is not needed since |
4518 | * in the socket option context we hold a socket lock and |
4519 | * thus the bound address list can't change. |
4520 | */ |
4521 | list_for_each_entry(addr, &bp->address_list, list) { |
4522 | memcpy(&temp, &addr->a, sizeof(temp)); |
4523 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp); |
4524 | addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len; |
4525 | if (space_left < addrlen) { |
4526 | err = -ENOMEM; /*fixme: right error?*/ |
4527 | goto out; |
4528 | } |
4529 | memcpy(buf, &temp, addrlen); |
4530 | buf += addrlen; |
4531 | bytes_copied += addrlen; |
4532 | cnt ++; |
4533 | space_left -= addrlen; |
4534 | } |
4535 | |
4536 | copy_getaddrs: |
4537 | if (copy_to_user(to, addrs, bytes_copied)) { |
4538 | err = -EFAULT; |
4539 | goto out; |
4540 | } |
4541 | if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) { |
4542 | err = -EFAULT; |
4543 | goto out; |
4544 | } |
4545 | if (put_user(bytes_copied, optlen)) |
4546 | err = -EFAULT; |
4547 | out: |
4548 | kfree(addrs); |
4549 | return err; |
4550 | } |
4551 | |
4552 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) |
4553 | * |
4554 | * Requests that the local SCTP stack use the enclosed peer address as |
4555 | * the association primary. The enclosed address must be one of the |
4556 | * association peer's addresses. |
4557 | */ |
4558 | static int sctp_getsockopt_primary_addr(struct sock *sk, int len, |
4559 | char __user *optval, int __user *optlen) |
4560 | { |
4561 | struct sctp_prim prim; |
4562 | struct sctp_association *asoc; |
4563 | struct sctp_sock *sp = sctp_sk(sk); |
4564 | |
4565 | if (len < sizeof(struct sctp_prim)) |
4566 | return -EINVAL; |
4567 | |
4568 | len = sizeof(struct sctp_prim); |
4569 | |
4570 | if (copy_from_user(&prim, optval, len)) |
4571 | return -EFAULT; |
4572 | |
4573 | asoc = sctp_id2assoc(sk, prim.ssp_assoc_id); |
4574 | if (!asoc) |
4575 | return -EINVAL; |
4576 | |
4577 | if (!asoc->peer.primary_path) |
4578 | return -ENOTCONN; |
4579 | |
4580 | memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr, |
4581 | asoc->peer.primary_path->af_specific->sockaddr_len); |
4582 | |
4583 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, |
4584 | (union sctp_addr *)&prim.ssp_addr); |
4585 | |
4586 | if (put_user(len, optlen)) |
4587 | return -EFAULT; |
4588 | if (copy_to_user(optval, &prim, len)) |
4589 | return -EFAULT; |
4590 | |
4591 | return 0; |
4592 | } |
4593 | |
4594 | /* |
4595 | * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER) |
4596 | * |
4597 | * Requests that the local endpoint set the specified Adaptation Layer |
4598 | * Indication parameter for all future INIT and INIT-ACK exchanges. |
4599 | */ |
4600 | static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len, |
4601 | char __user *optval, int __user *optlen) |
4602 | { |
4603 | struct sctp_setadaptation adaptation; |
4604 | |
4605 | if (len < sizeof(struct sctp_setadaptation)) |
4606 | return -EINVAL; |
4607 | |
4608 | len = sizeof(struct sctp_setadaptation); |
4609 | |
4610 | adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind; |
4611 | |
4612 | if (put_user(len, optlen)) |
4613 | return -EFAULT; |
4614 | if (copy_to_user(optval, &adaptation, len)) |
4615 | return -EFAULT; |
4616 | |
4617 | return 0; |
4618 | } |
4619 | |
4620 | /* |
4621 | * |
4622 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) |
4623 | * |
4624 | * Applications that wish to use the sendto() system call may wish to |
4625 | * specify a default set of parameters that would normally be supplied |
4626 | * through the inclusion of ancillary data. This socket option allows |
4627 | * such an application to set the default sctp_sndrcvinfo structure. |
4628 | |
4629 | |
4630 | * The application that wishes to use this socket option simply passes |
4631 | * in to this call the sctp_sndrcvinfo structure defined in Section |
4632 | * 5.2.2) The input parameters accepted by this call include |
4633 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, |
4634 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in |
4635 | * to this call if the caller is using the UDP model. |
4636 | * |
4637 | * For getsockopt, it get the default sctp_sndrcvinfo structure. |
4638 | */ |
4639 | static int sctp_getsockopt_default_send_param(struct sock *sk, |
4640 | int len, char __user *optval, |
4641 | int __user *optlen) |
4642 | { |
4643 | struct sctp_sndrcvinfo info; |
4644 | struct sctp_association *asoc; |
4645 | struct sctp_sock *sp = sctp_sk(sk); |
4646 | |
4647 | if (len < sizeof(struct sctp_sndrcvinfo)) |
4648 | return -EINVAL; |
4649 | |
4650 | len = sizeof(struct sctp_sndrcvinfo); |
4651 | |
4652 | if (copy_from_user(&info, optval, len)) |
4653 | return -EFAULT; |
4654 | |
4655 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); |
4656 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) |
4657 | return -EINVAL; |
4658 | |
4659 | if (asoc) { |
4660 | info.sinfo_stream = asoc->default_stream; |
4661 | info.sinfo_flags = asoc->default_flags; |
4662 | info.sinfo_ppid = asoc->default_ppid; |
4663 | info.sinfo_context = asoc->default_context; |
4664 | info.sinfo_timetolive = asoc->default_timetolive; |
4665 | } else { |
4666 | info.sinfo_stream = sp->default_stream; |
4667 | info.sinfo_flags = sp->default_flags; |
4668 | info.sinfo_ppid = sp->default_ppid; |
4669 | info.sinfo_context = sp->default_context; |
4670 | info.sinfo_timetolive = sp->default_timetolive; |
4671 | } |
4672 | |
4673 | if (put_user(len, optlen)) |
4674 | return -EFAULT; |
4675 | if (copy_to_user(optval, &info, len)) |
4676 | return -EFAULT; |
4677 | |
4678 | return 0; |
4679 | } |
4680 | |
4681 | /* |
4682 | * |
4683 | * 7.1.5 SCTP_NODELAY |
4684 | * |
4685 | * Turn on/off any Nagle-like algorithm. This means that packets are |
4686 | * generally sent as soon as possible and no unnecessary delays are |
4687 | * introduced, at the cost of more packets in the network. Expects an |
4688 | * integer boolean flag. |
4689 | */ |
4690 | |
4691 | static int sctp_getsockopt_nodelay(struct sock *sk, int len, |
4692 | char __user *optval, int __user *optlen) |
4693 | { |
4694 | int val; |
4695 | |
4696 | if (len < sizeof(int)) |
4697 | return -EINVAL; |
4698 | |
4699 | len = sizeof(int); |
4700 | val = (sctp_sk(sk)->nodelay == 1); |
4701 | if (put_user(len, optlen)) |
4702 | return -EFAULT; |
4703 | if (copy_to_user(optval, &val, len)) |
4704 | return -EFAULT; |
4705 | return 0; |
4706 | } |
4707 | |
4708 | /* |
4709 | * |
4710 | * 7.1.1 SCTP_RTOINFO |
4711 | * |
4712 | * The protocol parameters used to initialize and bound retransmission |
4713 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access |
4714 | * and modify these parameters. |
4715 | * All parameters are time values, in milliseconds. A value of 0, when |
4716 | * modifying the parameters, indicates that the current value should not |
4717 | * be changed. |
4718 | * |
4719 | */ |
4720 | static int sctp_getsockopt_rtoinfo(struct sock *sk, int len, |
4721 | char __user *optval, |
4722 | int __user *optlen) { |
4723 | struct sctp_rtoinfo rtoinfo; |
4724 | struct sctp_association *asoc; |
4725 | |
4726 | if (len < sizeof (struct sctp_rtoinfo)) |
4727 | return -EINVAL; |
4728 | |
4729 | len = sizeof(struct sctp_rtoinfo); |
4730 | |
4731 | if (copy_from_user(&rtoinfo, optval, len)) |
4732 | return -EFAULT; |
4733 | |
4734 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); |
4735 | |
4736 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) |
4737 | return -EINVAL; |
4738 | |
4739 | /* Values corresponding to the specific association. */ |
4740 | if (asoc) { |
4741 | rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial); |
4742 | rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max); |
4743 | rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min); |
4744 | } else { |
4745 | /* Values corresponding to the endpoint. */ |
4746 | struct sctp_sock *sp = sctp_sk(sk); |
4747 | |
4748 | rtoinfo.srto_initial = sp->rtoinfo.srto_initial; |
4749 | rtoinfo.srto_max = sp->rtoinfo.srto_max; |
4750 | rtoinfo.srto_min = sp->rtoinfo.srto_min; |
4751 | } |
4752 | |
4753 | if (put_user(len, optlen)) |
4754 | return -EFAULT; |
4755 | |
4756 | if (copy_to_user(optval, &rtoinfo, len)) |
4757 | return -EFAULT; |
4758 | |
4759 | return 0; |
4760 | } |
4761 | |
4762 | /* |
4763 | * |
4764 | * 7.1.2 SCTP_ASSOCINFO |
4765 | * |
4766 | * This option is used to tune the maximum retransmission attempts |
4767 | * of the association. |
4768 | * Returns an error if the new association retransmission value is |
4769 | * greater than the sum of the retransmission value of the peer. |
4770 | * See [SCTP] for more information. |
4771 | * |
4772 | */ |
4773 | static int sctp_getsockopt_associnfo(struct sock *sk, int len, |
4774 | char __user *optval, |
4775 | int __user *optlen) |
4776 | { |
4777 | |
4778 | struct sctp_assocparams assocparams; |
4779 | struct sctp_association *asoc; |
4780 | struct list_head *pos; |
4781 | int cnt = 0; |
4782 | |
4783 | if (len < sizeof (struct sctp_assocparams)) |
4784 | return -EINVAL; |
4785 | |
4786 | len = sizeof(struct sctp_assocparams); |
4787 | |
4788 | if (copy_from_user(&assocparams, optval, len)) |
4789 | return -EFAULT; |
4790 | |
4791 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); |
4792 | |
4793 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) |
4794 | return -EINVAL; |
4795 | |
4796 | /* Values correspoinding to the specific association */ |
4797 | if (asoc) { |
4798 | assocparams.sasoc_asocmaxrxt = asoc->max_retrans; |
4799 | assocparams.sasoc_peer_rwnd = asoc->peer.rwnd; |
4800 | assocparams.sasoc_local_rwnd = asoc->a_rwnd; |
4801 | assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec |
4802 | * 1000) + |
4803 | (asoc->cookie_life.tv_usec |
4804 | / 1000); |
4805 | |
4806 | list_for_each(pos, &asoc->peer.transport_addr_list) { |
4807 | cnt ++; |
4808 | } |
4809 | |
4810 | assocparams.sasoc_number_peer_destinations = cnt; |
4811 | } else { |
4812 | /* Values corresponding to the endpoint */ |
4813 | struct sctp_sock *sp = sctp_sk(sk); |
4814 | |
4815 | assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt; |
4816 | assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd; |
4817 | assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd; |
4818 | assocparams.sasoc_cookie_life = |
4819 | sp->assocparams.sasoc_cookie_life; |
4820 | assocparams.sasoc_number_peer_destinations = |
4821 | sp->assocparams. |
4822 | sasoc_number_peer_destinations; |
4823 | } |
4824 | |
4825 | if (put_user(len, optlen)) |
4826 | return -EFAULT; |
4827 | |
4828 | if (copy_to_user(optval, &assocparams, len)) |
4829 | return -EFAULT; |
4830 | |
4831 | return 0; |
4832 | } |
4833 | |
4834 | /* |
4835 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) |
4836 | * |
4837 | * This socket option is a boolean flag which turns on or off mapped V4 |
4838 | * addresses. If this option is turned on and the socket is type |
4839 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. |
4840 | * If this option is turned off, then no mapping will be done of V4 |
4841 | * addresses and a user will receive both PF_INET6 and PF_INET type |
4842 | * addresses on the socket. |
4843 | */ |
4844 | static int sctp_getsockopt_mappedv4(struct sock *sk, int len, |
4845 | char __user *optval, int __user *optlen) |
4846 | { |
4847 | int val; |
4848 | struct sctp_sock *sp = sctp_sk(sk); |
4849 | |
4850 | if (len < sizeof(int)) |
4851 | return -EINVAL; |
4852 | |
4853 | len = sizeof(int); |
4854 | val = sp->v4mapped; |
4855 | if (put_user(len, optlen)) |
4856 | return -EFAULT; |
4857 | if (copy_to_user(optval, &val, len)) |
4858 | return -EFAULT; |
4859 | |
4860 | return 0; |
4861 | } |
4862 | |
4863 | /* |
4864 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) |
4865 | * (chapter and verse is quoted at sctp_setsockopt_context()) |
4866 | */ |
4867 | static int sctp_getsockopt_context(struct sock *sk, int len, |
4868 | char __user *optval, int __user *optlen) |
4869 | { |
4870 | struct sctp_assoc_value params; |
4871 | struct sctp_sock *sp; |
4872 | struct sctp_association *asoc; |
4873 | |
4874 | if (len < sizeof(struct sctp_assoc_value)) |
4875 | return -EINVAL; |
4876 | |
4877 | len = sizeof(struct sctp_assoc_value); |
4878 | |
4879 | if (copy_from_user(¶ms, optval, len)) |
4880 | return -EFAULT; |
4881 | |
4882 | sp = sctp_sk(sk); |
4883 | |
4884 | if (params.assoc_id != 0) { |
4885 | asoc = sctp_id2assoc(sk, params.assoc_id); |
4886 | if (!asoc) |
4887 | return -EINVAL; |
4888 | params.assoc_value = asoc->default_rcv_context; |
4889 | } else { |
4890 | params.assoc_value = sp->default_rcv_context; |
4891 | } |
4892 | |
4893 | if (put_user(len, optlen)) |
4894 | return -EFAULT; |
4895 | if (copy_to_user(optval, ¶ms, len)) |
4896 | return -EFAULT; |
4897 | |
4898 | return 0; |
4899 | } |
4900 | |
4901 | /* |
4902 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
4903 | * This option will get or set the maximum size to put in any outgoing |
4904 | * SCTP DATA chunk. If a message is larger than this size it will be |
4905 | * fragmented by SCTP into the specified size. Note that the underlying |
4906 | * SCTP implementation may fragment into smaller sized chunks when the |
4907 | * PMTU of the underlying association is smaller than the value set by |
4908 | * the user. The default value for this option is '0' which indicates |
4909 | * the user is NOT limiting fragmentation and only the PMTU will effect |
4910 | * SCTP's choice of DATA chunk size. Note also that values set larger |
4911 | * than the maximum size of an IP datagram will effectively let SCTP |
4912 | * control fragmentation (i.e. the same as setting this option to 0). |
4913 | * |
4914 | * The following structure is used to access and modify this parameter: |
4915 | * |
4916 | * struct sctp_assoc_value { |
4917 | * sctp_assoc_t assoc_id; |
4918 | * uint32_t assoc_value; |
4919 | * }; |
4920 | * |
4921 | * assoc_id: This parameter is ignored for one-to-one style sockets. |
4922 | * For one-to-many style sockets this parameter indicates which |
4923 | * association the user is performing an action upon. Note that if |
4924 | * this field's value is zero then the endpoints default value is |
4925 | * changed (effecting future associations only). |
4926 | * assoc_value: This parameter specifies the maximum size in bytes. |
4927 | */ |
4928 | static int sctp_getsockopt_maxseg(struct sock *sk, int len, |
4929 | char __user *optval, int __user *optlen) |
4930 | { |
4931 | struct sctp_assoc_value params; |
4932 | struct sctp_association *asoc; |
4933 | |
4934 | if (len == sizeof(int)) { |
4935 | printk(KERN_WARNING |
4936 | "SCTP: Use of int in maxseg socket option deprecated\n"); |
4937 | printk(KERN_WARNING |
4938 | "SCTP: Use struct sctp_assoc_value instead\n"); |
4939 | params.assoc_id = 0; |
4940 | } else if (len >= sizeof(struct sctp_assoc_value)) { |
4941 | len = sizeof(struct sctp_assoc_value); |
4942 | if (copy_from_user(¶ms, optval, sizeof(params))) |
4943 | return -EFAULT; |
4944 | } else |
4945 | return -EINVAL; |
4946 | |
4947 | asoc = sctp_id2assoc(sk, params.assoc_id); |
4948 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) |
4949 | return -EINVAL; |
4950 | |
4951 | if (asoc) |
4952 | params.assoc_value = asoc->frag_point; |
4953 | else |
4954 | params.assoc_value = sctp_sk(sk)->user_frag; |
4955 | |
4956 | if (put_user(len, optlen)) |
4957 | return -EFAULT; |
4958 | if (len == sizeof(int)) { |
4959 | if (copy_to_user(optval, ¶ms.assoc_value, len)) |
4960 | return -EFAULT; |
4961 | } else { |
4962 | if (copy_to_user(optval, ¶ms, len)) |
4963 | return -EFAULT; |
4964 | } |
4965 | |
4966 | return 0; |
4967 | } |
4968 | |
4969 | /* |
4970 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) |
4971 | * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave()) |
4972 | */ |
4973 | static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len, |
4974 | char __user *optval, int __user *optlen) |
4975 | { |
4976 | int val; |
4977 | |
4978 | if (len < sizeof(int)) |
4979 | return -EINVAL; |
4980 | |
4981 | len = sizeof(int); |
4982 | |
4983 | val = sctp_sk(sk)->frag_interleave; |
4984 | if (put_user(len, optlen)) |
4985 | return -EFAULT; |
4986 | if (copy_to_user(optval, &val, len)) |
4987 | return -EFAULT; |
4988 | |
4989 | return 0; |
4990 | } |
4991 | |
4992 | /* |
4993 | * 7.1.25. Set or Get the sctp partial delivery point |
4994 | * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point()) |
4995 | */ |
4996 | static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len, |
4997 | char __user *optval, |
4998 | int __user *optlen) |
4999 | { |
5000 | u32 val; |
5001 | |
5002 | if (len < sizeof(u32)) |
5003 | return -EINVAL; |
5004 | |
5005 | len = sizeof(u32); |
5006 | |
5007 | val = sctp_sk(sk)->pd_point; |
5008 | if (put_user(len, optlen)) |
5009 | return -EFAULT; |
5010 | if (copy_to_user(optval, &val, len)) |
5011 | return -EFAULT; |
5012 | |
5013 | return -ENOTSUPP; |
5014 | } |
5015 | |
5016 | /* |
5017 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) |
5018 | * (chapter and verse is quoted at sctp_setsockopt_maxburst()) |
5019 | */ |
5020 | static int sctp_getsockopt_maxburst(struct sock *sk, int len, |
5021 | char __user *optval, |
5022 | int __user *optlen) |
5023 | { |
5024 | struct sctp_assoc_value params; |
5025 | struct sctp_sock *sp; |
5026 | struct sctp_association *asoc; |
5027 | |
5028 | if (len == sizeof(int)) { |
5029 | printk(KERN_WARNING |
5030 | "SCTP: Use of int in max_burst socket option deprecated\n"); |
5031 | printk(KERN_WARNING |
5032 | "SCTP: Use struct sctp_assoc_value instead\n"); |
5033 | params.assoc_id = 0; |
5034 | } else if (len >= sizeof(struct sctp_assoc_value)) { |
5035 | len = sizeof(struct sctp_assoc_value); |
5036 | if (copy_from_user(¶ms, optval, len)) |
5037 | return -EFAULT; |
5038 | } else |
5039 | return -EINVAL; |
5040 | |
5041 | sp = sctp_sk(sk); |
5042 | |
5043 | if (params.assoc_id != 0) { |
5044 | asoc = sctp_id2assoc(sk, params.assoc_id); |
5045 | if (!asoc) |
5046 | return -EINVAL; |
5047 | params.assoc_value = asoc->max_burst; |
5048 | } else |
5049 | params.assoc_value = sp->max_burst; |
5050 | |
5051 | if (len == sizeof(int)) { |
5052 | if (copy_to_user(optval, ¶ms.assoc_value, len)) |
5053 | return -EFAULT; |
5054 | } else { |
5055 | if (copy_to_user(optval, ¶ms, len)) |
5056 | return -EFAULT; |
5057 | } |
5058 | |
5059 | return 0; |
5060 | |
5061 | } |
5062 | |
5063 | static int sctp_getsockopt_hmac_ident(struct sock *sk, int len, |
5064 | char __user *optval, int __user *optlen) |
5065 | { |
5066 | struct sctp_hmacalgo __user *p = (void __user *)optval; |
5067 | struct sctp_hmac_algo_param *hmacs; |
5068 | __u16 data_len = 0; |
5069 | u32 num_idents; |
5070 | |
5071 | if (!sctp_auth_enable) |
5072 | return -EACCES; |
5073 | |
5074 | hmacs = sctp_sk(sk)->ep->auth_hmacs_list; |
5075 | data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t); |
5076 | |
5077 | if (len < sizeof(struct sctp_hmacalgo) + data_len) |
5078 | return -EINVAL; |
5079 | |
5080 | len = sizeof(struct sctp_hmacalgo) + data_len; |
5081 | num_idents = data_len / sizeof(u16); |
5082 | |
5083 | if (put_user(len, optlen)) |
5084 | return -EFAULT; |
5085 | if (put_user(num_idents, &p->shmac_num_idents)) |
5086 | return -EFAULT; |
5087 | if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len)) |
5088 | return -EFAULT; |
5089 | return 0; |
5090 | } |
5091 | |
5092 | static int sctp_getsockopt_active_key(struct sock *sk, int len, |
5093 | char __user *optval, int __user *optlen) |
5094 | { |
5095 | struct sctp_authkeyid val; |
5096 | struct sctp_association *asoc; |
5097 | |
5098 | if (!sctp_auth_enable) |
5099 | return -EACCES; |
5100 | |
5101 | if (len < sizeof(struct sctp_authkeyid)) |
5102 | return -EINVAL; |
5103 | if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid))) |
5104 | return -EFAULT; |
5105 | |
5106 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); |
5107 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) |
5108 | return -EINVAL; |
5109 | |
5110 | if (asoc) |
5111 | val.scact_keynumber = asoc->active_key_id; |
5112 | else |
5113 | val.scact_keynumber = sctp_sk(sk)->ep->active_key_id; |
5114 | |
5115 | len = sizeof(struct sctp_authkeyid); |
5116 | if (put_user(len, optlen)) |
5117 | return -EFAULT; |
5118 | if (copy_to_user(optval, &val, len)) |
5119 | return -EFAULT; |
5120 | |
5121 | return 0; |
5122 | } |
5123 | |
5124 | static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len, |
5125 | char __user *optval, int __user *optlen) |
5126 | { |
5127 | struct sctp_authchunks __user *p = (void __user *)optval; |
5128 | struct sctp_authchunks val; |
5129 | struct sctp_association *asoc; |
5130 | struct sctp_chunks_param *ch; |
5131 | u32 num_chunks = 0; |
5132 | char __user *to; |
5133 | |
5134 | if (!sctp_auth_enable) |
5135 | return -EACCES; |
5136 | |
5137 | if (len < sizeof(struct sctp_authchunks)) |
5138 | return -EINVAL; |
5139 | |
5140 | if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks))) |
5141 | return -EFAULT; |
5142 | |
5143 | to = p->gauth_chunks; |
5144 | asoc = sctp_id2assoc(sk, val.gauth_assoc_id); |
5145 | if (!asoc) |
5146 | return -EINVAL; |
5147 | |
5148 | ch = asoc->peer.peer_chunks; |
5149 | if (!ch) |
5150 | goto num; |
5151 | |
5152 | /* See if the user provided enough room for all the data */ |
5153 | num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); |
5154 | if (len < num_chunks) |
5155 | return -EINVAL; |
5156 | |
5157 | if (copy_to_user(to, ch->chunks, num_chunks)) |
5158 | return -EFAULT; |
5159 | num: |
5160 | len = sizeof(struct sctp_authchunks) + num_chunks; |
5161 | if (put_user(len, optlen)) return -EFAULT; |
5162 | if (put_user(num_chunks, &p->gauth_number_of_chunks)) |
5163 | return -EFAULT; |
5164 | return 0; |
5165 | } |
5166 | |
5167 | static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len, |
5168 | char __user *optval, int __user *optlen) |
5169 | { |
5170 | struct sctp_authchunks __user *p = (void __user *)optval; |
5171 | struct sctp_authchunks val; |
5172 | struct sctp_association *asoc; |
5173 | struct sctp_chunks_param *ch; |
5174 | u32 num_chunks = 0; |
5175 | char __user *to; |
5176 | |
5177 | if (!sctp_auth_enable) |
5178 | return -EACCES; |
5179 | |
5180 | if (len < sizeof(struct sctp_authchunks)) |
5181 | return -EINVAL; |
5182 | |
5183 | if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks))) |
5184 | return -EFAULT; |
5185 | |
5186 | to = p->gauth_chunks; |
5187 | asoc = sctp_id2assoc(sk, val.gauth_assoc_id); |
5188 | if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP)) |
5189 | return -EINVAL; |
5190 | |
5191 | if (asoc) |
5192 | ch = (struct sctp_chunks_param*)asoc->c.auth_chunks; |
5193 | else |
5194 | ch = sctp_sk(sk)->ep->auth_chunk_list; |
5195 | |
5196 | if (!ch) |
5197 | goto num; |
5198 | |
5199 | num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); |
5200 | if (len < sizeof(struct sctp_authchunks) + num_chunks) |
5201 | return -EINVAL; |
5202 | |
5203 | if (copy_to_user(to, ch->chunks, num_chunks)) |
5204 | return -EFAULT; |
5205 | num: |
5206 | len = sizeof(struct sctp_authchunks) + num_chunks; |
5207 | if (put_user(len, optlen)) |
5208 | return -EFAULT; |
5209 | if (put_user(num_chunks, &p->gauth_number_of_chunks)) |
5210 | return -EFAULT; |
5211 | |
5212 | return 0; |
5213 | } |
5214 | |
5215 | /* |
5216 | * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER) |
5217 | * This option gets the current number of associations that are attached |
5218 | * to a one-to-many style socket. The option value is an uint32_t. |
5219 | */ |
5220 | static int sctp_getsockopt_assoc_number(struct sock *sk, int len, |
5221 | char __user *optval, int __user *optlen) |
5222 | { |
5223 | struct sctp_sock *sp = sctp_sk(sk); |
5224 | struct sctp_association *asoc; |
5225 | u32 val = 0; |
5226 | |
5227 | if (sctp_style(sk, TCP)) |
5228 | return -EOPNOTSUPP; |
5229 | |
5230 | if (len < sizeof(u32)) |
5231 | return -EINVAL; |
5232 | |
5233 | len = sizeof(u32); |
5234 | |
5235 | list_for_each_entry(asoc, &(sp->ep->asocs), asocs) { |
5236 | val++; |
5237 | } |
5238 | |
5239 | if (put_user(len, optlen)) |
5240 | return -EFAULT; |
5241 | if (copy_to_user(optval, &val, len)) |
5242 | return -EFAULT; |
5243 | |
5244 | return 0; |
5245 | } |
5246 | |
5247 | SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname, |
5248 | char __user *optval, int __user *optlen) |
5249 | { |
5250 | int retval = 0; |
5251 | int len; |
5252 | |
5253 | SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n", |
5254 | sk, optname); |
5255 | |
5256 | /* I can hardly begin to describe how wrong this is. This is |
5257 | * so broken as to be worse than useless. The API draft |
5258 | * REALLY is NOT helpful here... I am not convinced that the |
5259 | * semantics of getsockopt() with a level OTHER THAN SOL_SCTP |
5260 | * are at all well-founded. |
5261 | */ |
5262 | if (level != SOL_SCTP) { |
5263 | struct sctp_af *af = sctp_sk(sk)->pf->af; |
5264 | |
5265 | retval = af->getsockopt(sk, level, optname, optval, optlen); |
5266 | return retval; |
5267 | } |
5268 | |
5269 | if (get_user(len, optlen)) |
5270 | return -EFAULT; |
5271 | |
5272 | sctp_lock_sock(sk); |
5273 | |
5274 | switch (optname) { |
5275 | case SCTP_STATUS: |
5276 | retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen); |
5277 | break; |
5278 | case SCTP_DISABLE_FRAGMENTS: |
5279 | retval = sctp_getsockopt_disable_fragments(sk, len, optval, |
5280 | optlen); |
5281 | break; |
5282 | case SCTP_EVENTS: |
5283 | retval = sctp_getsockopt_events(sk, len, optval, optlen); |
5284 | break; |
5285 | case SCTP_AUTOCLOSE: |
5286 | retval = sctp_getsockopt_autoclose(sk, len, optval, optlen); |
5287 | break; |
5288 | case SCTP_SOCKOPT_PEELOFF: |
5289 | retval = sctp_getsockopt_peeloff(sk, len, optval, optlen); |
5290 | break; |
5291 | case SCTP_PEER_ADDR_PARAMS: |
5292 | retval = sctp_getsockopt_peer_addr_params(sk, len, optval, |
5293 | optlen); |
5294 | break; |
5295 | case SCTP_DELAYED_ACK: |
5296 | retval = sctp_getsockopt_delayed_ack(sk, len, optval, |
5297 | optlen); |
5298 | break; |
5299 | case SCTP_INITMSG: |
5300 | retval = sctp_getsockopt_initmsg(sk, len, optval, optlen); |
5301 | break; |
5302 | case SCTP_GET_PEER_ADDRS: |
5303 | retval = sctp_getsockopt_peer_addrs(sk, len, optval, |
5304 | optlen); |
5305 | break; |
5306 | case SCTP_GET_LOCAL_ADDRS: |
5307 | retval = sctp_getsockopt_local_addrs(sk, len, optval, |
5308 | optlen); |
5309 | break; |
5310 | case SCTP_SOCKOPT_CONNECTX3: |
5311 | retval = sctp_getsockopt_connectx3(sk, len, optval, optlen); |
5312 | break; |
5313 | case SCTP_DEFAULT_SEND_PARAM: |
5314 | retval = sctp_getsockopt_default_send_param(sk, len, |
5315 | optval, optlen); |
5316 | break; |
5317 | case SCTP_PRIMARY_ADDR: |
5318 | retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen); |
5319 | break; |
5320 | case SCTP_NODELAY: |
5321 | retval = sctp_getsockopt_nodelay(sk, len, optval, optlen); |
5322 | break; |
5323 | case SCTP_RTOINFO: |
5324 | retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen); |
5325 | break; |
5326 | case SCTP_ASSOCINFO: |
5327 | retval = sctp_getsockopt_associnfo(sk, len, optval, optlen); |
5328 | break; |
5329 | case SCTP_I_WANT_MAPPED_V4_ADDR: |
5330 | retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen); |
5331 | break; |
5332 | case SCTP_MAXSEG: |
5333 | retval = sctp_getsockopt_maxseg(sk, len, optval, optlen); |
5334 | break; |
5335 | case SCTP_GET_PEER_ADDR_INFO: |
5336 | retval = sctp_getsockopt_peer_addr_info(sk, len, optval, |
5337 | optlen); |
5338 | break; |
5339 | case SCTP_ADAPTATION_LAYER: |
5340 | retval = sctp_getsockopt_adaptation_layer(sk, len, optval, |
5341 | optlen); |
5342 | break; |
5343 | case SCTP_CONTEXT: |
5344 | retval = sctp_getsockopt_context(sk, len, optval, optlen); |
5345 | break; |
5346 | case SCTP_FRAGMENT_INTERLEAVE: |
5347 | retval = sctp_getsockopt_fragment_interleave(sk, len, optval, |
5348 | optlen); |
5349 | break; |
5350 | case SCTP_PARTIAL_DELIVERY_POINT: |
5351 | retval = sctp_getsockopt_partial_delivery_point(sk, len, optval, |
5352 | optlen); |
5353 | break; |
5354 | case SCTP_MAX_BURST: |
5355 | retval = sctp_getsockopt_maxburst(sk, len, optval, optlen); |
5356 | break; |
5357 | case SCTP_AUTH_KEY: |
5358 | case SCTP_AUTH_CHUNK: |
5359 | case SCTP_AUTH_DELETE_KEY: |
5360 | retval = -EOPNOTSUPP; |
5361 | break; |
5362 | case SCTP_HMAC_IDENT: |
5363 | retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen); |
5364 | break; |
5365 | case SCTP_AUTH_ACTIVE_KEY: |
5366 | retval = sctp_getsockopt_active_key(sk, len, optval, optlen); |
5367 | break; |
5368 | case SCTP_PEER_AUTH_CHUNKS: |
5369 | retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval, |
5370 | optlen); |
5371 | break; |
5372 | case SCTP_LOCAL_AUTH_CHUNKS: |
5373 | retval = sctp_getsockopt_local_auth_chunks(sk, len, optval, |
5374 | optlen); |
5375 | break; |
5376 | case SCTP_GET_ASSOC_NUMBER: |
5377 | retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen); |
5378 | break; |
5379 | default: |
5380 | retval = -ENOPROTOOPT; |
5381 | break; |
5382 | } |
5383 | |
5384 | sctp_release_sock(sk); |
5385 | return retval; |
5386 | } |
5387 | |
5388 | static void sctp_hash(struct sock *sk) |
5389 | { |
5390 | /* STUB */ |
5391 | } |
5392 | |
5393 | static void sctp_unhash(struct sock *sk) |
5394 | { |
5395 | /* STUB */ |
5396 | } |
5397 | |
5398 | /* Check if port is acceptable. Possibly find first available port. |
5399 | * |
5400 | * The port hash table (contained in the 'global' SCTP protocol storage |
5401 | * returned by struct sctp_protocol *sctp_get_protocol()). The hash |
5402 | * table is an array of 4096 lists (sctp_bind_hashbucket). Each |
5403 | * list (the list number is the port number hashed out, so as you |
5404 | * would expect from a hash function, all the ports in a given list have |
5405 | * such a number that hashes out to the same list number; you were |
5406 | * expecting that, right?); so each list has a set of ports, with a |
5407 | * link to the socket (struct sock) that uses it, the port number and |
5408 | * a fastreuse flag (FIXME: NPI ipg). |
5409 | */ |
5410 | static struct sctp_bind_bucket *sctp_bucket_create( |
5411 | struct sctp_bind_hashbucket *head, unsigned short snum); |
5412 | |
5413 | static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr) |
5414 | { |
5415 | struct sctp_bind_hashbucket *head; /* hash list */ |
5416 | struct sctp_bind_bucket *pp; /* hash list port iterator */ |
5417 | struct hlist_node *node; |
5418 | unsigned short snum; |
5419 | int ret; |
5420 | |
5421 | snum = ntohs(addr->v4.sin_port); |
5422 | |
5423 | SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum); |
5424 | sctp_local_bh_disable(); |
5425 | |
5426 | if (snum == 0) { |
5427 | /* Search for an available port. */ |
5428 | int low, high, remaining, index; |
5429 | unsigned int rover; |
5430 | |
5431 | inet_get_local_port_range(&low, &high); |
5432 | remaining = (high - low) + 1; |
5433 | rover = net_random() % remaining + low; |
5434 | |
5435 | do { |
5436 | rover++; |
5437 | if ((rover < low) || (rover > high)) |
5438 | rover = low; |
5439 | index = sctp_phashfn(rover); |
5440 | head = &sctp_port_hashtable[index]; |
5441 | sctp_spin_lock(&head->lock); |
5442 | sctp_for_each_hentry(pp, node, &head->chain) |
5443 | if (pp->port == rover) |
5444 | goto next; |
5445 | break; |
5446 | next: |
5447 | sctp_spin_unlock(&head->lock); |
5448 | } while (--remaining > 0); |
5449 | |
5450 | /* Exhausted local port range during search? */ |
5451 | ret = 1; |
5452 | if (remaining <= 0) |
5453 | goto fail; |
5454 | |
5455 | /* OK, here is the one we will use. HEAD (the port |
5456 | * hash table list entry) is non-NULL and we hold it's |
5457 | * mutex. |
5458 | */ |
5459 | snum = rover; |
5460 | } else { |
5461 | /* We are given an specific port number; we verify |
5462 | * that it is not being used. If it is used, we will |
5463 | * exahust the search in the hash list corresponding |
5464 | * to the port number (snum) - we detect that with the |
5465 | * port iterator, pp being NULL. |
5466 | */ |
5467 | head = &sctp_port_hashtable[sctp_phashfn(snum)]; |
5468 | sctp_spin_lock(&head->lock); |
5469 | sctp_for_each_hentry(pp, node, &head->chain) { |
5470 | if (pp->port == snum) |
5471 | goto pp_found; |
5472 | } |
5473 | } |
5474 | pp = NULL; |
5475 | goto pp_not_found; |
5476 | pp_found: |
5477 | if (!hlist_empty(&pp->owner)) { |
5478 | /* We had a port hash table hit - there is an |
5479 | * available port (pp != NULL) and it is being |
5480 | * used by other socket (pp->owner not empty); that other |
5481 | * socket is going to be sk2. |
5482 | */ |
5483 | int reuse = sk->sk_reuse; |
5484 | struct sock *sk2; |
5485 | struct hlist_node *node; |
5486 | |
5487 | SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n"); |
5488 | if (pp->fastreuse && sk->sk_reuse && |
5489 | sk->sk_state != SCTP_SS_LISTENING) |
5490 | goto success; |
5491 | |
5492 | /* Run through the list of sockets bound to the port |
5493 | * (pp->port) [via the pointers bind_next and |
5494 | * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one, |
5495 | * we get the endpoint they describe and run through |
5496 | * the endpoint's list of IP (v4 or v6) addresses, |
5497 | * comparing each of the addresses with the address of |
5498 | * the socket sk. If we find a match, then that means |
5499 | * that this port/socket (sk) combination are already |
5500 | * in an endpoint. |
5501 | */ |
5502 | sk_for_each_bound(sk2, node, &pp->owner) { |
5503 | struct sctp_endpoint *ep2; |
5504 | ep2 = sctp_sk(sk2)->ep; |
5505 | |
5506 | if (sk == sk2 || |
5507 | (reuse && sk2->sk_reuse && |
5508 | sk2->sk_state != SCTP_SS_LISTENING)) |
5509 | continue; |
5510 | |
5511 | if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr, |
5512 | sctp_sk(sk2), sctp_sk(sk))) { |
5513 | ret = (long)sk2; |
5514 | goto fail_unlock; |
5515 | } |
5516 | } |
5517 | SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n"); |
5518 | } |
5519 | pp_not_found: |
5520 | /* If there was a hash table miss, create a new port. */ |
5521 | ret = 1; |
5522 | if (!pp && !(pp = sctp_bucket_create(head, snum))) |
5523 | goto fail_unlock; |
5524 | |
5525 | /* In either case (hit or miss), make sure fastreuse is 1 only |
5526 | * if sk->sk_reuse is too (that is, if the caller requested |
5527 | * SO_REUSEADDR on this socket -sk-). |
5528 | */ |
5529 | if (hlist_empty(&pp->owner)) { |
5530 | if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING) |
5531 | pp->fastreuse = 1; |
5532 | else |
5533 | pp->fastreuse = 0; |
5534 | } else if (pp->fastreuse && |
5535 | (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING)) |
5536 | pp->fastreuse = 0; |
5537 | |
5538 | /* We are set, so fill up all the data in the hash table |
5539 | * entry, tie the socket list information with the rest of the |
5540 | * sockets FIXME: Blurry, NPI (ipg). |
5541 | */ |
5542 | success: |
5543 | if (!sctp_sk(sk)->bind_hash) { |
5544 | inet_sk(sk)->inet_num = snum; |
5545 | sk_add_bind_node(sk, &pp->owner); |
5546 | sctp_sk(sk)->bind_hash = pp; |
5547 | } |
5548 | ret = 0; |
5549 | |
5550 | fail_unlock: |
5551 | sctp_spin_unlock(&head->lock); |
5552 | |
5553 | fail: |
5554 | sctp_local_bh_enable(); |
5555 | return ret; |
5556 | } |
5557 | |
5558 | /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral |
5559 | * port is requested. |
5560 | */ |
5561 | static int sctp_get_port(struct sock *sk, unsigned short snum) |
5562 | { |
5563 | long ret; |
5564 | union sctp_addr addr; |
5565 | struct sctp_af *af = sctp_sk(sk)->pf->af; |
5566 | |
5567 | /* Set up a dummy address struct from the sk. */ |
5568 | af->from_sk(&addr, sk); |
5569 | addr.v4.sin_port = htons(snum); |
5570 | |
5571 | /* Note: sk->sk_num gets filled in if ephemeral port request. */ |
5572 | ret = sctp_get_port_local(sk, &addr); |
5573 | |
5574 | return (ret ? 1 : 0); |
5575 | } |
5576 | |
5577 | /* |
5578 | * Move a socket to LISTENING state. |
5579 | */ |
5580 | SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog) |
5581 | { |
5582 | struct sctp_sock *sp = sctp_sk(sk); |
5583 | struct sctp_endpoint *ep = sp->ep; |
5584 | struct crypto_hash *tfm = NULL; |
5585 | |
5586 | /* Allocate HMAC for generating cookie. */ |
5587 | if (!sctp_sk(sk)->hmac && sctp_hmac_alg) { |
5588 | tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC); |
5589 | if (IS_ERR(tfm)) { |
5590 | if (net_ratelimit()) { |
5591 | printk(KERN_INFO |
5592 | "SCTP: failed to load transform for %s: %ld\n", |
5593 | sctp_hmac_alg, PTR_ERR(tfm)); |
5594 | } |
5595 | return -ENOSYS; |
5596 | } |
5597 | sctp_sk(sk)->hmac = tfm; |
5598 | } |
5599 | |
5600 | /* |
5601 | * If a bind() or sctp_bindx() is not called prior to a listen() |
5602 | * call that allows new associations to be accepted, the system |
5603 | * picks an ephemeral port and will choose an address set equivalent |
5604 | * to binding with a wildcard address. |
5605 | * |
5606 | * This is not currently spelled out in the SCTP sockets |
5607 | * extensions draft, but follows the practice as seen in TCP |
5608 | * sockets. |
5609 | * |
5610 | */ |
5611 | sk->sk_state = SCTP_SS_LISTENING; |
5612 | if (!ep->base.bind_addr.port) { |
5613 | if (sctp_autobind(sk)) |
5614 | return -EAGAIN; |
5615 | } else { |
5616 | if (sctp_get_port(sk, inet_sk(sk)->inet_num)) { |
5617 | sk->sk_state = SCTP_SS_CLOSED; |
5618 | return -EADDRINUSE; |
5619 | } |
5620 | } |
5621 | |
5622 | sk->sk_max_ack_backlog = backlog; |
5623 | sctp_hash_endpoint(ep); |
5624 | return 0; |
5625 | } |
5626 | |
5627 | /* |
5628 | * 4.1.3 / 5.1.3 listen() |
5629 | * |
5630 | * By default, new associations are not accepted for UDP style sockets. |
5631 | * An application uses listen() to mark a socket as being able to |
5632 | * accept new associations. |
5633 | * |
5634 | * On TCP style sockets, applications use listen() to ready the SCTP |
5635 | * endpoint for accepting inbound associations. |
5636 | * |
5637 | * On both types of endpoints a backlog of '0' disables listening. |
5638 | * |
5639 | * Move a socket to LISTENING state. |
5640 | */ |
5641 | int sctp_inet_listen(struct socket *sock, int backlog) |
5642 | { |
5643 | struct sock *sk = sock->sk; |
5644 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
5645 | int err = -EINVAL; |
5646 | |
5647 | if (unlikely(backlog < 0)) |
5648 | return err; |
5649 | |
5650 | sctp_lock_sock(sk); |
5651 | |
5652 | /* Peeled-off sockets are not allowed to listen(). */ |
5653 | if (sctp_style(sk, UDP_HIGH_BANDWIDTH)) |
5654 | goto out; |
5655 | |
5656 | if (sock->state != SS_UNCONNECTED) |
5657 | goto out; |
5658 | |
5659 | /* If backlog is zero, disable listening. */ |
5660 | if (!backlog) { |
5661 | if (sctp_sstate(sk, CLOSED)) |
5662 | goto out; |
5663 | |
5664 | err = 0; |
5665 | sctp_unhash_endpoint(ep); |
5666 | sk->sk_state = SCTP_SS_CLOSED; |
5667 | if (sk->sk_reuse) |
5668 | sctp_sk(sk)->bind_hash->fastreuse = 1; |
5669 | goto out; |
5670 | } |
5671 | |
5672 | /* If we are already listening, just update the backlog */ |
5673 | if (sctp_sstate(sk, LISTENING)) |
5674 | sk->sk_max_ack_backlog = backlog; |
5675 | else { |
5676 | err = sctp_listen_start(sk, backlog); |
5677 | if (err) |
5678 | goto out; |
5679 | } |
5680 | |
5681 | err = 0; |
5682 | out: |
5683 | sctp_release_sock(sk); |
5684 | return err; |
5685 | } |
5686 | |
5687 | /* |
5688 | * This function is done by modeling the current datagram_poll() and the |
5689 | * tcp_poll(). Note that, based on these implementations, we don't |
5690 | * lock the socket in this function, even though it seems that, |
5691 | * ideally, locking or some other mechanisms can be used to ensure |
5692 | * the integrity of the counters (sndbuf and wmem_alloc) used |
5693 | * in this place. We assume that we don't need locks either until proven |
5694 | * otherwise. |
5695 | * |
5696 | * Another thing to note is that we include the Async I/O support |
5697 | * here, again, by modeling the current TCP/UDP code. We don't have |
5698 | * a good way to test with it yet. |
5699 | */ |
5700 | unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait) |
5701 | { |
5702 | struct sock *sk = sock->sk; |
5703 | struct sctp_sock *sp = sctp_sk(sk); |
5704 | unsigned int mask; |
5705 | |
5706 | poll_wait(file, sk->sk_sleep, wait); |
5707 | |
5708 | /* A TCP-style listening socket becomes readable when the accept queue |
5709 | * is not empty. |
5710 | */ |
5711 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) |
5712 | return (!list_empty(&sp->ep->asocs)) ? |
5713 | (POLLIN | POLLRDNORM) : 0; |
5714 | |
5715 | mask = 0; |
5716 | |
5717 | /* Is there any exceptional events? */ |
5718 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
5719 | mask |= POLLERR; |
5720 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
5721 | mask |= POLLRDHUP; |
5722 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
5723 | mask |= POLLHUP; |
5724 | |
5725 | /* Is it readable? Reconsider this code with TCP-style support. */ |
5726 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
5727 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
5728 | mask |= POLLIN | POLLRDNORM; |
5729 | |
5730 | /* The association is either gone or not ready. */ |
5731 | if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED)) |
5732 | return mask; |
5733 | |
5734 | /* Is it writable? */ |
5735 | if (sctp_writeable(sk)) { |
5736 | mask |= POLLOUT | POLLWRNORM; |
5737 | } else { |
5738 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
5739 | /* |
5740 | * Since the socket is not locked, the buffer |
5741 | * might be made available after the writeable check and |
5742 | * before the bit is set. This could cause a lost I/O |
5743 | * signal. tcp_poll() has a race breaker for this race |
5744 | * condition. Based on their implementation, we put |
5745 | * in the following code to cover it as well. |
5746 | */ |
5747 | if (sctp_writeable(sk)) |
5748 | mask |= POLLOUT | POLLWRNORM; |
5749 | } |
5750 | return mask; |
5751 | } |
5752 | |
5753 | /******************************************************************** |
5754 | * 2nd Level Abstractions |
5755 | ********************************************************************/ |
5756 | |
5757 | static struct sctp_bind_bucket *sctp_bucket_create( |
5758 | struct sctp_bind_hashbucket *head, unsigned short snum) |
5759 | { |
5760 | struct sctp_bind_bucket *pp; |
5761 | |
5762 | pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC); |
5763 | if (pp) { |
5764 | SCTP_DBG_OBJCNT_INC(bind_bucket); |
5765 | pp->port = snum; |
5766 | pp->fastreuse = 0; |
5767 | INIT_HLIST_HEAD(&pp->owner); |
5768 | hlist_add_head(&pp->node, &head->chain); |
5769 | } |
5770 | return pp; |
5771 | } |
5772 | |
5773 | /* Caller must hold hashbucket lock for this tb with local BH disabled */ |
5774 | static void sctp_bucket_destroy(struct sctp_bind_bucket *pp) |
5775 | { |
5776 | if (pp && hlist_empty(&pp->owner)) { |
5777 | __hlist_del(&pp->node); |
5778 | kmem_cache_free(sctp_bucket_cachep, pp); |
5779 | SCTP_DBG_OBJCNT_DEC(bind_bucket); |
5780 | } |
5781 | } |
5782 | |
5783 | /* Release this socket's reference to a local port. */ |
5784 | static inline void __sctp_put_port(struct sock *sk) |
5785 | { |
5786 | struct sctp_bind_hashbucket *head = |
5787 | &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)]; |
5788 | struct sctp_bind_bucket *pp; |
5789 | |
5790 | sctp_spin_lock(&head->lock); |
5791 | pp = sctp_sk(sk)->bind_hash; |
5792 | __sk_del_bind_node(sk); |
5793 | sctp_sk(sk)->bind_hash = NULL; |
5794 | inet_sk(sk)->inet_num = 0; |
5795 | sctp_bucket_destroy(pp); |
5796 | sctp_spin_unlock(&head->lock); |
5797 | } |
5798 | |
5799 | void sctp_put_port(struct sock *sk) |
5800 | { |
5801 | sctp_local_bh_disable(); |
5802 | __sctp_put_port(sk); |
5803 | sctp_local_bh_enable(); |
5804 | } |
5805 | |
5806 | /* |
5807 | * The system picks an ephemeral port and choose an address set equivalent |
5808 | * to binding with a wildcard address. |
5809 | * One of those addresses will be the primary address for the association. |
5810 | * This automatically enables the multihoming capability of SCTP. |
5811 | */ |
5812 | static int sctp_autobind(struct sock *sk) |
5813 | { |
5814 | union sctp_addr autoaddr; |
5815 | struct sctp_af *af; |
5816 | __be16 port; |
5817 | |
5818 | /* Initialize a local sockaddr structure to INADDR_ANY. */ |
5819 | af = sctp_sk(sk)->pf->af; |
5820 | |
5821 | port = htons(inet_sk(sk)->inet_num); |
5822 | af->inaddr_any(&autoaddr, port); |
5823 | |
5824 | return sctp_do_bind(sk, &autoaddr, af->sockaddr_len); |
5825 | } |
5826 | |
5827 | /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation. |
5828 | * |
5829 | * From RFC 2292 |
5830 | * 4.2 The cmsghdr Structure * |
5831 | * |
5832 | * When ancillary data is sent or received, any number of ancillary data |
5833 | * objects can be specified by the msg_control and msg_controllen members of |
5834 | * the msghdr structure, because each object is preceded by |
5835 | * a cmsghdr structure defining the object's length (the cmsg_len member). |
5836 | * Historically Berkeley-derived implementations have passed only one object |
5837 | * at a time, but this API allows multiple objects to be |
5838 | * passed in a single call to sendmsg() or recvmsg(). The following example |
5839 | * shows two ancillary data objects in a control buffer. |
5840 | * |
5841 | * |<--------------------------- msg_controllen -------------------------->| |
5842 | * | | |
5843 | * |
5844 | * |<----- ancillary data object ----->|<----- ancillary data object ----->| |
5845 | * |
5846 | * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->| |
5847 | * | | | |
5848 | * |
5849 | * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| | |
5850 | * |
5851 | * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| | |
5852 | * | | | | | |
5853 | * |
5854 | * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+ |
5855 | * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX| |
5856 | * |
5857 | * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX| |
5858 | * |
5859 | * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+ |
5860 | * ^ |
5861 | * | |
5862 | * |
5863 | * msg_control |
5864 | * points here |
5865 | */ |
5866 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg, |
5867 | sctp_cmsgs_t *cmsgs) |
5868 | { |
5869 | struct cmsghdr *cmsg; |
5870 | struct msghdr *my_msg = (struct msghdr *)msg; |
5871 | |
5872 | for (cmsg = CMSG_FIRSTHDR(msg); |
5873 | cmsg != NULL; |
5874 | cmsg = CMSG_NXTHDR(my_msg, cmsg)) { |
5875 | if (!CMSG_OK(my_msg, cmsg)) |
5876 | return -EINVAL; |
5877 | |
5878 | /* Should we parse this header or ignore? */ |
5879 | if (cmsg->cmsg_level != IPPROTO_SCTP) |
5880 | continue; |
5881 | |
5882 | /* Strictly check lengths following example in SCM code. */ |
5883 | switch (cmsg->cmsg_type) { |
5884 | case SCTP_INIT: |
5885 | /* SCTP Socket API Extension |
5886 | * 5.2.1 SCTP Initiation Structure (SCTP_INIT) |
5887 | * |
5888 | * This cmsghdr structure provides information for |
5889 | * initializing new SCTP associations with sendmsg(). |
5890 | * The SCTP_INITMSG socket option uses this same data |
5891 | * structure. This structure is not used for |
5892 | * recvmsg(). |
5893 | * |
5894 | * cmsg_level cmsg_type cmsg_data[] |
5895 | * ------------ ------------ ---------------------- |
5896 | * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg |
5897 | */ |
5898 | if (cmsg->cmsg_len != |
5899 | CMSG_LEN(sizeof(struct sctp_initmsg))) |
5900 | return -EINVAL; |
5901 | cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg); |
5902 | break; |
5903 | |
5904 | case SCTP_SNDRCV: |
5905 | /* SCTP Socket API Extension |
5906 | * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV) |
5907 | * |
5908 | * This cmsghdr structure specifies SCTP options for |
5909 | * sendmsg() and describes SCTP header information |
5910 | * about a received message through recvmsg(). |
5911 | * |
5912 | * cmsg_level cmsg_type cmsg_data[] |
5913 | * ------------ ------------ ---------------------- |
5914 | * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo |
5915 | */ |
5916 | if (cmsg->cmsg_len != |
5917 | CMSG_LEN(sizeof(struct sctp_sndrcvinfo))) |
5918 | return -EINVAL; |
5919 | |
5920 | cmsgs->info = |
5921 | (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg); |
5922 | |
5923 | /* Minimally, validate the sinfo_flags. */ |
5924 | if (cmsgs->info->sinfo_flags & |
5925 | ~(SCTP_UNORDERED | SCTP_ADDR_OVER | |
5926 | SCTP_ABORT | SCTP_EOF)) |
5927 | return -EINVAL; |
5928 | break; |
5929 | |
5930 | default: |
5931 | return -EINVAL; |
5932 | } |
5933 | } |
5934 | return 0; |
5935 | } |
5936 | |
5937 | /* |
5938 | * Wait for a packet.. |
5939 | * Note: This function is the same function as in core/datagram.c |
5940 | * with a few modifications to make lksctp work. |
5941 | */ |
5942 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p) |
5943 | { |
5944 | int error; |
5945 | DEFINE_WAIT(wait); |
5946 | |
5947 | prepare_to_wait_exclusive(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
5948 | |
5949 | /* Socket errors? */ |
5950 | error = sock_error(sk); |
5951 | if (error) |
5952 | goto out; |
5953 | |
5954 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
5955 | goto ready; |
5956 | |
5957 | /* Socket shut down? */ |
5958 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
5959 | goto out; |
5960 | |
5961 | /* Sequenced packets can come disconnected. If so we report the |
5962 | * problem. |
5963 | */ |
5964 | error = -ENOTCONN; |
5965 | |
5966 | /* Is there a good reason to think that we may receive some data? */ |
5967 | if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING)) |
5968 | goto out; |
5969 | |
5970 | /* Handle signals. */ |
5971 | if (signal_pending(current)) |
5972 | goto interrupted; |
5973 | |
5974 | /* Let another process have a go. Since we are going to sleep |
5975 | * anyway. Note: This may cause odd behaviors if the message |
5976 | * does not fit in the user's buffer, but this seems to be the |
5977 | * only way to honor MSG_DONTWAIT realistically. |
5978 | */ |
5979 | sctp_release_sock(sk); |
5980 | *timeo_p = schedule_timeout(*timeo_p); |
5981 | sctp_lock_sock(sk); |
5982 | |
5983 | ready: |
5984 | finish_wait(sk->sk_sleep, &wait); |
5985 | return 0; |
5986 | |
5987 | interrupted: |
5988 | error = sock_intr_errno(*timeo_p); |
5989 | |
5990 | out: |
5991 | finish_wait(sk->sk_sleep, &wait); |
5992 | *err = error; |
5993 | return error; |
5994 | } |
5995 | |
5996 | /* Receive a datagram. |
5997 | * Note: This is pretty much the same routine as in core/datagram.c |
5998 | * with a few changes to make lksctp work. |
5999 | */ |
6000 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, |
6001 | int noblock, int *err) |
6002 | { |
6003 | int error; |
6004 | struct sk_buff *skb; |
6005 | long timeo; |
6006 | |
6007 | timeo = sock_rcvtimeo(sk, noblock); |
6008 | |
6009 | SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n", |
6010 | timeo, MAX_SCHEDULE_TIMEOUT); |
6011 | |
6012 | do { |
6013 | /* Again only user level code calls this function, |
6014 | * so nothing interrupt level |
6015 | * will suddenly eat the receive_queue. |
6016 | * |
6017 | * Look at current nfs client by the way... |
6018 | * However, this function was corrent in any case. 8) |
6019 | */ |
6020 | if (flags & MSG_PEEK) { |
6021 | spin_lock_bh(&sk->sk_receive_queue.lock); |
6022 | skb = skb_peek(&sk->sk_receive_queue); |
6023 | if (skb) |
6024 | atomic_inc(&skb->users); |
6025 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
6026 | } else { |
6027 | skb = skb_dequeue(&sk->sk_receive_queue); |
6028 | } |
6029 | |
6030 | if (skb) |
6031 | return skb; |
6032 | |
6033 | /* Caller is allowed not to check sk->sk_err before calling. */ |
6034 | error = sock_error(sk); |
6035 | if (error) |
6036 | goto no_packet; |
6037 | |
6038 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
6039 | break; |
6040 | |
6041 | /* User doesn't want to wait. */ |
6042 | error = -EAGAIN; |
6043 | if (!timeo) |
6044 | goto no_packet; |
6045 | } while (sctp_wait_for_packet(sk, err, &timeo) == 0); |
6046 | |
6047 | return NULL; |
6048 | |
6049 | no_packet: |
6050 | *err = error; |
6051 | return NULL; |
6052 | } |
6053 | |
6054 | /* If sndbuf has changed, wake up per association sndbuf waiters. */ |
6055 | static void __sctp_write_space(struct sctp_association *asoc) |
6056 | { |
6057 | struct sock *sk = asoc->base.sk; |
6058 | struct socket *sock = sk->sk_socket; |
6059 | |
6060 | if ((sctp_wspace(asoc) > 0) && sock) { |
6061 | if (waitqueue_active(&asoc->wait)) |
6062 | wake_up_interruptible(&asoc->wait); |
6063 | |
6064 | if (sctp_writeable(sk)) { |
6065 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
6066 | wake_up_interruptible(sk->sk_sleep); |
6067 | |
6068 | /* Note that we try to include the Async I/O support |
6069 | * here by modeling from the current TCP/UDP code. |
6070 | * We have not tested with it yet. |
6071 | */ |
6072 | if (sock->fasync_list && |
6073 | !(sk->sk_shutdown & SEND_SHUTDOWN)) |
6074 | sock_wake_async(sock, |
6075 | SOCK_WAKE_SPACE, POLL_OUT); |
6076 | } |
6077 | } |
6078 | } |
6079 | |
6080 | /* Do accounting for the sndbuf space. |
6081 | * Decrement the used sndbuf space of the corresponding association by the |
6082 | * data size which was just transmitted(freed). |
6083 | */ |
6084 | static void sctp_wfree(struct sk_buff *skb) |
6085 | { |
6086 | struct sctp_association *asoc; |
6087 | struct sctp_chunk *chunk; |
6088 | struct sock *sk; |
6089 | |
6090 | /* Get the saved chunk pointer. */ |
6091 | chunk = *((struct sctp_chunk **)(skb->cb)); |
6092 | asoc = chunk->asoc; |
6093 | sk = asoc->base.sk; |
6094 | asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) + |
6095 | sizeof(struct sk_buff) + |
6096 | sizeof(struct sctp_chunk); |
6097 | |
6098 | atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
6099 | |
6100 | /* |
6101 | * This undoes what is done via sctp_set_owner_w and sk_mem_charge |
6102 | */ |
6103 | sk->sk_wmem_queued -= skb->truesize; |
6104 | sk_mem_uncharge(sk, skb->truesize); |
6105 | |
6106 | sock_wfree(skb); |
6107 | __sctp_write_space(asoc); |
6108 | |
6109 | sctp_association_put(asoc); |
6110 | } |
6111 | |
6112 | /* Do accounting for the receive space on the socket. |
6113 | * Accounting for the association is done in ulpevent.c |
6114 | * We set this as a destructor for the cloned data skbs so that |
6115 | * accounting is done at the correct time. |
6116 | */ |
6117 | void sctp_sock_rfree(struct sk_buff *skb) |
6118 | { |
6119 | struct sock *sk = skb->sk; |
6120 | struct sctp_ulpevent *event = sctp_skb2event(skb); |
6121 | |
6122 | atomic_sub(event->rmem_len, &sk->sk_rmem_alloc); |
6123 | |
6124 | /* |
6125 | * Mimic the behavior of sock_rfree |
6126 | */ |
6127 | sk_mem_uncharge(sk, event->rmem_len); |
6128 | } |
6129 | |
6130 | |
6131 | /* Helper function to wait for space in the sndbuf. */ |
6132 | static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p, |
6133 | size_t msg_len) |
6134 | { |
6135 | struct sock *sk = asoc->base.sk; |
6136 | int err = 0; |
6137 | long current_timeo = *timeo_p; |
6138 | DEFINE_WAIT(wait); |
6139 | |
6140 | SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n", |
6141 | asoc, (long)(*timeo_p), msg_len); |
6142 | |
6143 | /* Increment the association's refcnt. */ |
6144 | sctp_association_hold(asoc); |
6145 | |
6146 | /* Wait on the association specific sndbuf space. */ |
6147 | for (;;) { |
6148 | prepare_to_wait_exclusive(&asoc->wait, &wait, |
6149 | TASK_INTERRUPTIBLE); |
6150 | if (!*timeo_p) |
6151 | goto do_nonblock; |
6152 | if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING || |
6153 | asoc->base.dead) |
6154 | goto do_error; |
6155 | if (signal_pending(current)) |
6156 | goto do_interrupted; |
6157 | if (msg_len <= sctp_wspace(asoc)) |
6158 | break; |
6159 | |
6160 | /* Let another process have a go. Since we are going |
6161 | * to sleep anyway. |
6162 | */ |
6163 | sctp_release_sock(sk); |
6164 | current_timeo = schedule_timeout(current_timeo); |
6165 | BUG_ON(sk != asoc->base.sk); |
6166 | sctp_lock_sock(sk); |
6167 | |
6168 | *timeo_p = current_timeo; |
6169 | } |
6170 | |
6171 | out: |
6172 | finish_wait(&asoc->wait, &wait); |
6173 | |
6174 | /* Release the association's refcnt. */ |
6175 | sctp_association_put(asoc); |
6176 | |
6177 | return err; |
6178 | |
6179 | do_error: |
6180 | err = -EPIPE; |
6181 | goto out; |
6182 | |
6183 | do_interrupted: |
6184 | err = sock_intr_errno(*timeo_p); |
6185 | goto out; |
6186 | |
6187 | do_nonblock: |
6188 | err = -EAGAIN; |
6189 | goto out; |
6190 | } |
6191 | |
6192 | void sctp_data_ready(struct sock *sk, int len) |
6193 | { |
6194 | read_lock_bh(&sk->sk_callback_lock); |
6195 | if (sk_has_sleeper(sk)) |
6196 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN | |
6197 | POLLRDNORM | POLLRDBAND); |
6198 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
6199 | read_unlock_bh(&sk->sk_callback_lock); |
6200 | } |
6201 | |
6202 | /* If socket sndbuf has changed, wake up all per association waiters. */ |
6203 | void sctp_write_space(struct sock *sk) |
6204 | { |
6205 | struct sctp_association *asoc; |
6206 | |
6207 | /* Wake up the tasks in each wait queue. */ |
6208 | list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) { |
6209 | __sctp_write_space(asoc); |
6210 | } |
6211 | } |
6212 | |
6213 | /* Is there any sndbuf space available on the socket? |
6214 | * |
6215 | * Note that sk_wmem_alloc is the sum of the send buffers on all of the |
6216 | * associations on the same socket. For a UDP-style socket with |
6217 | * multiple associations, it is possible for it to be "unwriteable" |
6218 | * prematurely. I assume that this is acceptable because |
6219 | * a premature "unwriteable" is better than an accidental "writeable" which |
6220 | * would cause an unwanted block under certain circumstances. For the 1-1 |
6221 | * UDP-style sockets or TCP-style sockets, this code should work. |
6222 | * - Daisy |
6223 | */ |
6224 | static int sctp_writeable(struct sock *sk) |
6225 | { |
6226 | int amt = 0; |
6227 | |
6228 | amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk); |
6229 | if (amt < 0) |
6230 | amt = 0; |
6231 | return amt; |
6232 | } |
6233 | |
6234 | /* Wait for an association to go into ESTABLISHED state. If timeout is 0, |
6235 | * returns immediately with EINPROGRESS. |
6236 | */ |
6237 | static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p) |
6238 | { |
6239 | struct sock *sk = asoc->base.sk; |
6240 | int err = 0; |
6241 | long current_timeo = *timeo_p; |
6242 | DEFINE_WAIT(wait); |
6243 | |
6244 | SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc, |
6245 | (long)(*timeo_p)); |
6246 | |
6247 | /* Increment the association's refcnt. */ |
6248 | sctp_association_hold(asoc); |
6249 | |
6250 | for (;;) { |
6251 | prepare_to_wait_exclusive(&asoc->wait, &wait, |
6252 | TASK_INTERRUPTIBLE); |
6253 | if (!*timeo_p) |
6254 | goto do_nonblock; |
6255 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
6256 | break; |
6257 | if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING || |
6258 | asoc->base.dead) |
6259 | goto do_error; |
6260 | if (signal_pending(current)) |
6261 | goto do_interrupted; |
6262 | |
6263 | if (sctp_state(asoc, ESTABLISHED)) |
6264 | break; |
6265 | |
6266 | /* Let another process have a go. Since we are going |
6267 | * to sleep anyway. |
6268 | */ |
6269 | sctp_release_sock(sk); |
6270 | current_timeo = schedule_timeout(current_timeo); |
6271 | sctp_lock_sock(sk); |
6272 | |
6273 | *timeo_p = current_timeo; |
6274 | } |
6275 | |
6276 | out: |
6277 | finish_wait(&asoc->wait, &wait); |
6278 | |
6279 | /* Release the association's refcnt. */ |
6280 | sctp_association_put(asoc); |
6281 | |
6282 | return err; |
6283 | |
6284 | do_error: |
6285 | if (asoc->init_err_counter + 1 > asoc->max_init_attempts) |
6286 | err = -ETIMEDOUT; |
6287 | else |
6288 | err = -ECONNREFUSED; |
6289 | goto out; |
6290 | |
6291 | do_interrupted: |
6292 | err = sock_intr_errno(*timeo_p); |
6293 | goto out; |
6294 | |
6295 | do_nonblock: |
6296 | err = -EINPROGRESS; |
6297 | goto out; |
6298 | } |
6299 | |
6300 | static int sctp_wait_for_accept(struct sock *sk, long timeo) |
6301 | { |
6302 | struct sctp_endpoint *ep; |
6303 | int err = 0; |
6304 | DEFINE_WAIT(wait); |
6305 | |
6306 | ep = sctp_sk(sk)->ep; |
6307 | |
6308 | |
6309 | for (;;) { |
6310 | prepare_to_wait_exclusive(sk->sk_sleep, &wait, |
6311 | TASK_INTERRUPTIBLE); |
6312 | |
6313 | if (list_empty(&ep->asocs)) { |
6314 | sctp_release_sock(sk); |
6315 | timeo = schedule_timeout(timeo); |
6316 | sctp_lock_sock(sk); |
6317 | } |
6318 | |
6319 | err = -EINVAL; |
6320 | if (!sctp_sstate(sk, LISTENING)) |
6321 | break; |
6322 | |
6323 | err = 0; |
6324 | if (!list_empty(&ep->asocs)) |
6325 | break; |
6326 | |
6327 | err = sock_intr_errno(timeo); |
6328 | if (signal_pending(current)) |
6329 | break; |
6330 | |
6331 | err = -EAGAIN; |
6332 | if (!timeo) |
6333 | break; |
6334 | } |
6335 | |
6336 | finish_wait(sk->sk_sleep, &wait); |
6337 | |
6338 | return err; |
6339 | } |
6340 | |
6341 | static void sctp_wait_for_close(struct sock *sk, long timeout) |
6342 | { |
6343 | DEFINE_WAIT(wait); |
6344 | |
6345 | do { |
6346 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
6347 | if (list_empty(&sctp_sk(sk)->ep->asocs)) |
6348 | break; |
6349 | sctp_release_sock(sk); |
6350 | timeout = schedule_timeout(timeout); |
6351 | sctp_lock_sock(sk); |
6352 | } while (!signal_pending(current) && timeout); |
6353 | |
6354 | finish_wait(sk->sk_sleep, &wait); |
6355 | } |
6356 | |
6357 | static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk) |
6358 | { |
6359 | struct sk_buff *frag; |
6360 | |
6361 | if (!skb->data_len) |
6362 | goto done; |
6363 | |
6364 | /* Don't forget the fragments. */ |
6365 | skb_walk_frags(skb, frag) |
6366 | sctp_skb_set_owner_r_frag(frag, sk); |
6367 | |
6368 | done: |
6369 | sctp_skb_set_owner_r(skb, sk); |
6370 | } |
6371 | |
6372 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
6373 | struct sctp_association *asoc) |
6374 | { |
6375 | struct inet_sock *inet = inet_sk(sk); |
6376 | struct inet_sock *newinet; |
6377 | |
6378 | newsk->sk_type = sk->sk_type; |
6379 | newsk->sk_bound_dev_if = sk->sk_bound_dev_if; |
6380 | newsk->sk_flags = sk->sk_flags; |
6381 | newsk->sk_no_check = sk->sk_no_check; |
6382 | newsk->sk_reuse = sk->sk_reuse; |
6383 | |
6384 | newsk->sk_shutdown = sk->sk_shutdown; |
6385 | newsk->sk_destruct = inet_sock_destruct; |
6386 | newsk->sk_family = sk->sk_family; |
6387 | newsk->sk_protocol = IPPROTO_SCTP; |
6388 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; |
6389 | newsk->sk_sndbuf = sk->sk_sndbuf; |
6390 | newsk->sk_rcvbuf = sk->sk_rcvbuf; |
6391 | newsk->sk_lingertime = sk->sk_lingertime; |
6392 | newsk->sk_rcvtimeo = sk->sk_rcvtimeo; |
6393 | newsk->sk_sndtimeo = sk->sk_sndtimeo; |
6394 | |
6395 | newinet = inet_sk(newsk); |
6396 | |
6397 | /* Initialize sk's sport, dport, rcv_saddr and daddr for |
6398 | * getsockname() and getpeername() |
6399 | */ |
6400 | newinet->inet_sport = inet->inet_sport; |
6401 | newinet->inet_saddr = inet->inet_saddr; |
6402 | newinet->inet_rcv_saddr = inet->inet_rcv_saddr; |
6403 | newinet->inet_dport = htons(asoc->peer.port); |
6404 | newinet->pmtudisc = inet->pmtudisc; |
6405 | newinet->inet_id = asoc->next_tsn ^ jiffies; |
6406 | |
6407 | newinet->uc_ttl = inet->uc_ttl; |
6408 | newinet->mc_loop = 1; |
6409 | newinet->mc_ttl = 1; |
6410 | newinet->mc_index = 0; |
6411 | newinet->mc_list = NULL; |
6412 | } |
6413 | |
6414 | /* Populate the fields of the newsk from the oldsk and migrate the assoc |
6415 | * and its messages to the newsk. |
6416 | */ |
6417 | static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk, |
6418 | struct sctp_association *assoc, |
6419 | sctp_socket_type_t type) |
6420 | { |
6421 | struct sctp_sock *oldsp = sctp_sk(oldsk); |
6422 | struct sctp_sock *newsp = sctp_sk(newsk); |
6423 | struct sctp_bind_bucket *pp; /* hash list port iterator */ |
6424 | struct sctp_endpoint *newep = newsp->ep; |
6425 | struct sk_buff *skb, *tmp; |
6426 | struct sctp_ulpevent *event; |
6427 | struct sctp_bind_hashbucket *head; |
6428 | |
6429 | /* Migrate socket buffer sizes and all the socket level options to the |
6430 | * new socket. |
6431 | */ |
6432 | newsk->sk_sndbuf = oldsk->sk_sndbuf; |
6433 | newsk->sk_rcvbuf = oldsk->sk_rcvbuf; |
6434 | /* Brute force copy old sctp opt. */ |
6435 | inet_sk_copy_descendant(newsk, oldsk); |
6436 | |
6437 | /* Restore the ep value that was overwritten with the above structure |
6438 | * copy. |
6439 | */ |
6440 | newsp->ep = newep; |
6441 | newsp->hmac = NULL; |
6442 | |
6443 | /* Hook this new socket in to the bind_hash list. */ |
6444 | head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)]; |
6445 | sctp_local_bh_disable(); |
6446 | sctp_spin_lock(&head->lock); |
6447 | pp = sctp_sk(oldsk)->bind_hash; |
6448 | sk_add_bind_node(newsk, &pp->owner); |
6449 | sctp_sk(newsk)->bind_hash = pp; |
6450 | inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num; |
6451 | sctp_spin_unlock(&head->lock); |
6452 | sctp_local_bh_enable(); |
6453 | |
6454 | /* Copy the bind_addr list from the original endpoint to the new |
6455 | * endpoint so that we can handle restarts properly |
6456 | */ |
6457 | sctp_bind_addr_dup(&newsp->ep->base.bind_addr, |
6458 | &oldsp->ep->base.bind_addr, GFP_KERNEL); |
6459 | |
6460 | /* Move any messages in the old socket's receive queue that are for the |
6461 | * peeled off association to the new socket's receive queue. |
6462 | */ |
6463 | sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) { |
6464 | event = sctp_skb2event(skb); |
6465 | if (event->asoc == assoc) { |
6466 | __skb_unlink(skb, &oldsk->sk_receive_queue); |
6467 | __skb_queue_tail(&newsk->sk_receive_queue, skb); |
6468 | sctp_skb_set_owner_r_frag(skb, newsk); |
6469 | } |
6470 | } |
6471 | |
6472 | /* Clean up any messages pending delivery due to partial |
6473 | * delivery. Three cases: |
6474 | * 1) No partial deliver; no work. |
6475 | * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby. |
6476 | * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue. |
6477 | */ |
6478 | skb_queue_head_init(&newsp->pd_lobby); |
6479 | atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode); |
6480 | |
6481 | if (atomic_read(&sctp_sk(oldsk)->pd_mode)) { |
6482 | struct sk_buff_head *queue; |
6483 | |
6484 | /* Decide which queue to move pd_lobby skbs to. */ |
6485 | if (assoc->ulpq.pd_mode) { |
6486 | queue = &newsp->pd_lobby; |
6487 | } else |
6488 | queue = &newsk->sk_receive_queue; |
6489 | |
6490 | /* Walk through the pd_lobby, looking for skbs that |
6491 | * need moved to the new socket. |
6492 | */ |
6493 | sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) { |
6494 | event = sctp_skb2event(skb); |
6495 | if (event->asoc == assoc) { |
6496 | __skb_unlink(skb, &oldsp->pd_lobby); |
6497 | __skb_queue_tail(queue, skb); |
6498 | sctp_skb_set_owner_r_frag(skb, newsk); |
6499 | } |
6500 | } |
6501 | |
6502 | /* Clear up any skbs waiting for the partial |
6503 | * delivery to finish. |
6504 | */ |
6505 | if (assoc->ulpq.pd_mode) |
6506 | sctp_clear_pd(oldsk, NULL); |
6507 | |
6508 | } |
6509 | |
6510 | sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp) |
6511 | sctp_skb_set_owner_r_frag(skb, newsk); |
6512 | |
6513 | sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp) |
6514 | sctp_skb_set_owner_r_frag(skb, newsk); |
6515 | |
6516 | /* Set the type of socket to indicate that it is peeled off from the |
6517 | * original UDP-style socket or created with the accept() call on a |
6518 | * TCP-style socket.. |
6519 | */ |
6520 | newsp->type = type; |
6521 | |
6522 | /* Mark the new socket "in-use" by the user so that any packets |
6523 | * that may arrive on the association after we've moved it are |
6524 | * queued to the backlog. This prevents a potential race between |
6525 | * backlog processing on the old socket and new-packet processing |
6526 | * on the new socket. |
6527 | * |
6528 | * The caller has just allocated newsk so we can guarantee that other |
6529 | * paths won't try to lock it and then oldsk. |
6530 | */ |
6531 | lock_sock_nested(newsk, SINGLE_DEPTH_NESTING); |
6532 | sctp_assoc_migrate(assoc, newsk); |
6533 | |
6534 | /* If the association on the newsk is already closed before accept() |
6535 | * is called, set RCV_SHUTDOWN flag. |
6536 | */ |
6537 | if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) |
6538 | newsk->sk_shutdown |= RCV_SHUTDOWN; |
6539 | |
6540 | newsk->sk_state = SCTP_SS_ESTABLISHED; |
6541 | sctp_release_sock(newsk); |
6542 | } |
6543 | |
6544 | |
6545 | /* This proto struct describes the ULP interface for SCTP. */ |
6546 | struct proto sctp_prot = { |
6547 | .name = "SCTP", |
6548 | .owner = THIS_MODULE, |
6549 | .close = sctp_close, |
6550 | .connect = sctp_connect, |
6551 | .disconnect = sctp_disconnect, |
6552 | .accept = sctp_accept, |
6553 | .ioctl = sctp_ioctl, |
6554 | .init = sctp_init_sock, |
6555 | .destroy = sctp_destroy_sock, |
6556 | .shutdown = sctp_shutdown, |
6557 | .setsockopt = sctp_setsockopt, |
6558 | .getsockopt = sctp_getsockopt, |
6559 | .sendmsg = sctp_sendmsg, |
6560 | .recvmsg = sctp_recvmsg, |
6561 | .bind = sctp_bind, |
6562 | .backlog_rcv = sctp_backlog_rcv, |
6563 | .hash = sctp_hash, |
6564 | .unhash = sctp_unhash, |
6565 | .get_port = sctp_get_port, |
6566 | .obj_size = sizeof(struct sctp_sock), |
6567 | .sysctl_mem = sysctl_sctp_mem, |
6568 | .sysctl_rmem = sysctl_sctp_rmem, |
6569 | .sysctl_wmem = sysctl_sctp_wmem, |
6570 | .memory_pressure = &sctp_memory_pressure, |
6571 | .enter_memory_pressure = sctp_enter_memory_pressure, |
6572 | .memory_allocated = &sctp_memory_allocated, |
6573 | .sockets_allocated = &sctp_sockets_allocated, |
6574 | }; |
6575 | |
6576 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
6577 | |
6578 | struct proto sctpv6_prot = { |
6579 | .name = "SCTPv6", |
6580 | .owner = THIS_MODULE, |
6581 | .close = sctp_close, |
6582 | .connect = sctp_connect, |
6583 | .disconnect = sctp_disconnect, |
6584 | .accept = sctp_accept, |
6585 | .ioctl = sctp_ioctl, |
6586 | .init = sctp_init_sock, |
6587 | .destroy = sctp_destroy_sock, |
6588 | .shutdown = sctp_shutdown, |
6589 | .setsockopt = sctp_setsockopt, |
6590 | .getsockopt = sctp_getsockopt, |
6591 | .sendmsg = sctp_sendmsg, |
6592 | .recvmsg = sctp_recvmsg, |
6593 | .bind = sctp_bind, |
6594 | .backlog_rcv = sctp_backlog_rcv, |
6595 | .hash = sctp_hash, |
6596 | .unhash = sctp_unhash, |
6597 | .get_port = sctp_get_port, |
6598 | .obj_size = sizeof(struct sctp6_sock), |
6599 | .sysctl_mem = sysctl_sctp_mem, |
6600 | .sysctl_rmem = sysctl_sctp_rmem, |
6601 | .sysctl_wmem = sysctl_sctp_wmem, |
6602 | .memory_pressure = &sctp_memory_pressure, |
6603 | .enter_memory_pressure = sctp_enter_memory_pressure, |
6604 | .memory_allocated = &sctp_memory_allocated, |
6605 | .sockets_allocated = &sctp_sockets_allocated, |
6606 | }; |
6607 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |
6608 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
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v3.9