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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 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
61 | ||
62 | #include <linux/types.h> | |
63 | #include <linux/kernel.h> | |
64 | #include <linux/wait.h> | |
65 | #include <linux/time.h> | |
66 | #include <linux/ip.h> | |
67 | #include <linux/capability.h> | |
68 | #include <linux/fcntl.h> | |
69 | #include <linux/poll.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/crypto.h> | |
72 | #include <linux/slab.h> | |
73 | ||
74 | #include <net/ip.h> | |
75 | #include <net/icmp.h> | |
76 | #include <net/route.h> | |
77 | #include <net/ipv6.h> | |
78 | #include <net/inet_common.h> | |
79 | ||
80 | #include <linux/socket.h> /* for sa_family_t */ | |
81 | #include <net/sock.h> | |
82 | #include <net/sctp/sctp.h> | |
83 | #include <net/sctp/sm.h> | |
84 | ||
85 | /* WARNING: Please do not remove the SCTP_STATIC attribute to | |
86 | * any of the functions below as they are used to export functions | |
87 | * used by a project regression testsuite. | |
88 | */ | |
89 | ||
90 | /* Forward declarations for internal helper functions. */ | |
91 | static int sctp_writeable(struct sock *sk); | |
92 | static void sctp_wfree(struct sk_buff *skb); | |
93 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, | |
94 | size_t msg_len); | |
95 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p); | |
96 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); | |
97 | static int sctp_wait_for_accept(struct sock *sk, long timeo); | |
98 | static void sctp_wait_for_close(struct sock *sk, long timeo); | |
99 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
100 | union sctp_addr *addr, int len); | |
101 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); | |
102 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); | |
103 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); | |
104 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); | |
105 | static int sctp_send_asconf(struct sctp_association *asoc, | |
106 | struct sctp_chunk *chunk); | |
107 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); | |
108 | static int sctp_autobind(struct sock *sk); | |
109 | static void sctp_sock_migrate(struct sock *, struct sock *, | |
110 | struct sctp_association *, sctp_socket_type_t); | |
111 | static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG; | |
112 | ||
113 | extern struct kmem_cache *sctp_bucket_cachep; | |
114 | extern long sysctl_sctp_mem[3]; | |
115 | extern int sysctl_sctp_rmem[3]; | |
116 | extern int sysctl_sctp_wmem[3]; | |
117 | ||
118 | static int sctp_memory_pressure; | |
119 | static atomic_long_t sctp_memory_allocated; | |
120 | struct percpu_counter sctp_sockets_allocated; | |
121 | ||
122 | static void sctp_enter_memory_pressure(struct sock *sk) | |
123 | { | |
124 | sctp_memory_pressure = 1; | |
125 | } | |
126 | ||
127 | ||
128 | /* Get the sndbuf space available at the time on the association. */ | |
129 | static inline int sctp_wspace(struct sctp_association *asoc) | |
130 | { | |
131 | int amt; | |
132 | ||
133 | if (asoc->ep->sndbuf_policy) | |
134 | amt = asoc->sndbuf_used; | |
135 | else | |
136 | amt = sk_wmem_alloc_get(asoc->base.sk); | |
137 | ||
138 | if (amt >= asoc->base.sk->sk_sndbuf) { | |
139 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
140 | amt = 0; | |
141 | else { | |
142 | amt = sk_stream_wspace(asoc->base.sk); | |
143 | if (amt < 0) | |
144 | amt = 0; | |
145 | } | |
146 | } else { | |
147 | amt = asoc->base.sk->sk_sndbuf - amt; | |
148 | } | |
149 | return amt; | |
150 | } | |
151 | ||
152 | /* Increment the used sndbuf space count of the corresponding association by | |
153 | * the size of the outgoing data chunk. | |
154 | * Also, set the skb destructor for sndbuf accounting later. | |
155 | * | |
156 | * Since it is always 1-1 between chunk and skb, and also a new skb is always | |
157 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the | |
158 | * destructor in the data chunk skb for the purpose of the sndbuf space | |
159 | * tracking. | |
160 | */ | |
161 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) | |
162 | { | |
163 | struct sctp_association *asoc = chunk->asoc; | |
164 | struct sock *sk = asoc->base.sk; | |
165 | ||
166 | /* The sndbuf space is tracked per association. */ | |
167 | sctp_association_hold(asoc); | |
168 | ||
169 | skb_set_owner_w(chunk->skb, sk); | |
170 | ||
171 | chunk->skb->destructor = sctp_wfree; | |
172 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ | |
173 | *((struct sctp_chunk **)(chunk->skb->cb)) = chunk; | |
174 | ||
175 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + | |
176 | sizeof(struct sk_buff) + | |
177 | sizeof(struct sctp_chunk); | |
178 | ||
179 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); | |
180 | sk->sk_wmem_queued += chunk->skb->truesize; | |
181 | sk_mem_charge(sk, chunk->skb->truesize); | |
182 | } | |
183 | ||
184 | /* Verify that this is a valid address. */ | |
185 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, | |
186 | int len) | |
187 | { | |
188 | struct sctp_af *af; | |
189 | ||
190 | /* Verify basic sockaddr. */ | |
191 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); | |
192 | if (!af) | |
193 | return -EINVAL; | |
194 | ||
195 | /* Is this a valid SCTP address? */ | |
196 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) | |
197 | return -EINVAL; | |
198 | ||
199 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) | |
200 | return -EINVAL; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | /* Look up the association by its id. If this is not a UDP-style | |
206 | * socket, the ID field is always ignored. | |
207 | */ | |
208 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) | |
209 | { | |
210 | struct sctp_association *asoc = NULL; | |
211 | ||
212 | /* If this is not a UDP-style socket, assoc id should be ignored. */ | |
213 | if (!sctp_style(sk, UDP)) { | |
214 | /* Return NULL if the socket state is not ESTABLISHED. It | |
215 | * could be a TCP-style listening socket or a socket which | |
216 | * hasn't yet called connect() to establish an association. | |
217 | */ | |
218 | if (!sctp_sstate(sk, ESTABLISHED)) | |
219 | return NULL; | |
220 | ||
221 | /* Get the first and the only association from the list. */ | |
222 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) | |
223 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, | |
224 | struct sctp_association, asocs); | |
225 | return asoc; | |
226 | } | |
227 | ||
228 | /* Otherwise this is a UDP-style socket. */ | |
229 | if (!id || (id == (sctp_assoc_t)-1)) | |
230 | return NULL; | |
231 | ||
232 | spin_lock_bh(&sctp_assocs_id_lock); | |
233 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); | |
234 | spin_unlock_bh(&sctp_assocs_id_lock); | |
235 | ||
236 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) | |
237 | return NULL; | |
238 | ||
239 | return asoc; | |
240 | } | |
241 | ||
242 | /* Look up the transport from an address and an assoc id. If both address and | |
243 | * id are specified, the associations matching the address and the id should be | |
244 | * the same. | |
245 | */ | |
246 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, | |
247 | struct sockaddr_storage *addr, | |
248 | sctp_assoc_t id) | |
249 | { | |
250 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; | |
251 | struct sctp_transport *transport; | |
252 | union sctp_addr *laddr = (union sctp_addr *)addr; | |
253 | ||
254 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, | |
255 | laddr, | |
256 | &transport); | |
257 | ||
258 | if (!addr_asoc) | |
259 | return NULL; | |
260 | ||
261 | id_asoc = sctp_id2assoc(sk, id); | |
262 | if (id_asoc && (id_asoc != addr_asoc)) | |
263 | return NULL; | |
264 | ||
265 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
266 | (union sctp_addr *)addr); | |
267 | ||
268 | return transport; | |
269 | } | |
270 | ||
271 | /* API 3.1.2 bind() - UDP Style Syntax | |
272 | * The syntax of bind() is, | |
273 | * | |
274 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); | |
275 | * | |
276 | * sd - the socket descriptor returned by socket(). | |
277 | * addr - the address structure (struct sockaddr_in or struct | |
278 | * sockaddr_in6 [RFC 2553]), | |
279 | * addr_len - the size of the address structure. | |
280 | */ | |
281 | SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) | |
282 | { | |
283 | int retval = 0; | |
284 | ||
285 | sctp_lock_sock(sk); | |
286 | ||
287 | SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n", | |
288 | sk, addr, addr_len); | |
289 | ||
290 | /* Disallow binding twice. */ | |
291 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
292 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, | |
293 | addr_len); | |
294 | else | |
295 | retval = -EINVAL; | |
296 | ||
297 | sctp_release_sock(sk); | |
298 | ||
299 | return retval; | |
300 | } | |
301 | ||
302 | static long sctp_get_port_local(struct sock *, union sctp_addr *); | |
303 | ||
304 | /* Verify this is a valid sockaddr. */ | |
305 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
306 | union sctp_addr *addr, int len) | |
307 | { | |
308 | struct sctp_af *af; | |
309 | ||
310 | /* Check minimum size. */ | |
311 | if (len < sizeof (struct sockaddr)) | |
312 | return NULL; | |
313 | ||
314 | /* V4 mapped address are really of AF_INET family */ | |
315 | if (addr->sa.sa_family == AF_INET6 && | |
316 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { | |
317 | if (!opt->pf->af_supported(AF_INET, opt)) | |
318 | return NULL; | |
319 | } else { | |
320 | /* Does this PF support this AF? */ | |
321 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | /* If we get this far, af is valid. */ | |
326 | af = sctp_get_af_specific(addr->sa.sa_family); | |
327 | ||
328 | if (len < af->sockaddr_len) | |
329 | return NULL; | |
330 | ||
331 | return af; | |
332 | } | |
333 | ||
334 | /* Bind a local address either to an endpoint or to an association. */ | |
335 | SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) | |
336 | { | |
337 | struct sctp_sock *sp = sctp_sk(sk); | |
338 | struct sctp_endpoint *ep = sp->ep; | |
339 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
340 | struct sctp_af *af; | |
341 | unsigned short snum; | |
342 | int ret = 0; | |
343 | ||
344 | /* Common sockaddr verification. */ | |
345 | af = sctp_sockaddr_af(sp, addr, len); | |
346 | if (!af) { | |
347 | SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n", | |
348 | sk, addr, len); | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | snum = ntohs(addr->v4.sin_port); | |
353 | ||
354 | SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ", | |
355 | ", port: %d, new port: %d, len: %d)\n", | |
356 | sk, | |
357 | addr, | |
358 | bp->port, snum, | |
359 | len); | |
360 | ||
361 | /* PF specific bind() address verification. */ | |
362 | if (!sp->pf->bind_verify(sp, addr)) | |
363 | return -EADDRNOTAVAIL; | |
364 | ||
365 | /* We must either be unbound, or bind to the same port. | |
366 | * It's OK to allow 0 ports if we are already bound. | |
367 | * We'll just inhert an already bound port in this case | |
368 | */ | |
369 | if (bp->port) { | |
370 | if (!snum) | |
371 | snum = bp->port; | |
372 | else if (snum != bp->port) { | |
373 | SCTP_DEBUG_PRINTK("sctp_do_bind:" | |
374 | " New port %d does not match existing port " | |
375 | "%d.\n", snum, bp->port); | |
376 | return -EINVAL; | |
377 | } | |
378 | } | |
379 | ||
380 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
381 | return -EACCES; | |
382 | ||
383 | /* See if the address matches any of the addresses we may have | |
384 | * already bound before checking against other endpoints. | |
385 | */ | |
386 | if (sctp_bind_addr_match(bp, addr, sp)) | |
387 | return -EINVAL; | |
388 | ||
389 | /* Make sure we are allowed to bind here. | |
390 | * The function sctp_get_port_local() does duplicate address | |
391 | * detection. | |
392 | */ | |
393 | addr->v4.sin_port = htons(snum); | |
394 | if ((ret = sctp_get_port_local(sk, addr))) { | |
395 | return -EADDRINUSE; | |
396 | } | |
397 | ||
398 | /* Refresh ephemeral port. */ | |
399 | if (!bp->port) | |
400 | bp->port = inet_sk(sk)->inet_num; | |
401 | ||
402 | /* Add the address to the bind address list. | |
403 | * Use GFP_ATOMIC since BHs will be disabled. | |
404 | */ | |
405 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); | |
406 | ||
407 | /* Copy back into socket for getsockname() use. */ | |
408 | if (!ret) { | |
409 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); | |
410 | af->to_sk_saddr(addr, sk); | |
411 | } | |
412 | ||
413 | return ret; | |
414 | } | |
415 | ||
416 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
417 | * | |
418 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged | |
419 | * at any one time. If a sender, after sending an ASCONF chunk, decides | |
420 | * it needs to transfer another ASCONF Chunk, it MUST wait until the | |
421 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a | |
422 | * subsequent ASCONF. Note this restriction binds each side, so at any | |
423 | * time two ASCONF may be in-transit on any given association (one sent | |
424 | * from each endpoint). | |
425 | */ | |
426 | static int sctp_send_asconf(struct sctp_association *asoc, | |
427 | struct sctp_chunk *chunk) | |
428 | { | |
429 | int retval = 0; | |
430 | ||
431 | /* If there is an outstanding ASCONF chunk, queue it for later | |
432 | * transmission. | |
433 | */ | |
434 | if (asoc->addip_last_asconf) { | |
435 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); | |
436 | goto out; | |
437 | } | |
438 | ||
439 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
440 | sctp_chunk_hold(chunk); | |
441 | retval = sctp_primitive_ASCONF(asoc, chunk); | |
442 | if (retval) | |
443 | sctp_chunk_free(chunk); | |
444 | else | |
445 | asoc->addip_last_asconf = chunk; | |
446 | ||
447 | out: | |
448 | return retval; | |
449 | } | |
450 | ||
451 | /* Add a list of addresses as bind addresses to local endpoint or | |
452 | * association. | |
453 | * | |
454 | * Basically run through each address specified in the addrs/addrcnt | |
455 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
456 | * sctp_do_bind() on it. | |
457 | * | |
458 | * If any of them fails, then the operation will be reversed and the | |
459 | * ones that were added will be removed. | |
460 | * | |
461 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
462 | */ | |
463 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) | |
464 | { | |
465 | int cnt; | |
466 | int retval = 0; | |
467 | void *addr_buf; | |
468 | struct sockaddr *sa_addr; | |
469 | struct sctp_af *af; | |
470 | ||
471 | SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n", | |
472 | sk, addrs, addrcnt); | |
473 | ||
474 | addr_buf = addrs; | |
475 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
476 | /* The list may contain either IPv4 or IPv6 address; | |
477 | * determine the address length for walking thru the list. | |
478 | */ | |
479 | sa_addr = (struct sockaddr *)addr_buf; | |
480 | af = sctp_get_af_specific(sa_addr->sa_family); | |
481 | if (!af) { | |
482 | retval = -EINVAL; | |
483 | goto err_bindx_add; | |
484 | } | |
485 | ||
486 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, | |
487 | af->sockaddr_len); | |
488 | ||
489 | addr_buf += af->sockaddr_len; | |
490 | ||
491 | err_bindx_add: | |
492 | if (retval < 0) { | |
493 | /* Failed. Cleanup the ones that have been added */ | |
494 | if (cnt > 0) | |
495 | sctp_bindx_rem(sk, addrs, cnt); | |
496 | return retval; | |
497 | } | |
498 | } | |
499 | ||
500 | return retval; | |
501 | } | |
502 | ||
503 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the | |
504 | * associations that are part of the endpoint indicating that a list of local | |
505 | * addresses are added to the endpoint. | |
506 | * | |
507 | * If any of the addresses is already in the bind address list of the | |
508 | * association, we do not send the chunk for that association. But it will not | |
509 | * affect other associations. | |
510 | * | |
511 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
512 | */ | |
513 | static int sctp_send_asconf_add_ip(struct sock *sk, | |
514 | struct sockaddr *addrs, | |
515 | int addrcnt) | |
516 | { | |
517 | struct sctp_sock *sp; | |
518 | struct sctp_endpoint *ep; | |
519 | struct sctp_association *asoc; | |
520 | struct sctp_bind_addr *bp; | |
521 | struct sctp_chunk *chunk; | |
522 | struct sctp_sockaddr_entry *laddr; | |
523 | union sctp_addr *addr; | |
524 | union sctp_addr saveaddr; | |
525 | void *addr_buf; | |
526 | struct sctp_af *af; | |
527 | struct list_head *p; | |
528 | int i; | |
529 | int retval = 0; | |
530 | ||
531 | if (!sctp_addip_enable) | |
532 | return retval; | |
533 | ||
534 | sp = sctp_sk(sk); | |
535 | ep = sp->ep; | |
536 | ||
537 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
538 | __func__, sk, addrs, addrcnt); | |
539 | ||
540 | list_for_each_entry(asoc, &ep->asocs, asocs) { | |
541 | ||
542 | if (!asoc->peer.asconf_capable) | |
543 | continue; | |
544 | ||
545 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) | |
546 | continue; | |
547 | ||
548 | if (!sctp_state(asoc, ESTABLISHED)) | |
549 | continue; | |
550 | ||
551 | /* Check if any address in the packed array of addresses is | |
552 | * in the bind address list of the association. If so, | |
553 | * do not send the asconf chunk to its peer, but continue with | |
554 | * other associations. | |
555 | */ | |
556 | addr_buf = addrs; | |
557 | for (i = 0; i < addrcnt; i++) { | |
558 | addr = (union sctp_addr *)addr_buf; | |
559 | af = sctp_get_af_specific(addr->v4.sin_family); | |
560 | if (!af) { | |
561 | retval = -EINVAL; | |
562 | goto out; | |
563 | } | |
564 | ||
565 | if (sctp_assoc_lookup_laddr(asoc, addr)) | |
566 | break; | |
567 | ||
568 | addr_buf += af->sockaddr_len; | |
569 | } | |
570 | if (i < addrcnt) | |
571 | continue; | |
572 | ||
573 | /* Use the first valid address in bind addr list of | |
574 | * association as Address Parameter of ASCONF CHUNK. | |
575 | */ | |
576 | bp = &asoc->base.bind_addr; | |
577 | p = bp->address_list.next; | |
578 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
579 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, | |
580 | addrcnt, SCTP_PARAM_ADD_IP); | |
581 | if (!chunk) { | |
582 | retval = -ENOMEM; | |
583 | goto out; | |
584 | } | |
585 | ||
586 | retval = sctp_send_asconf(asoc, chunk); | |
587 | if (retval) | |
588 | goto out; | |
589 | ||
590 | /* Add the new addresses to the bind address list with | |
591 | * use_as_src set to 0. | |
592 | */ | |
593 | addr_buf = addrs; | |
594 | for (i = 0; i < addrcnt; i++) { | |
595 | addr = (union sctp_addr *)addr_buf; | |
596 | af = sctp_get_af_specific(addr->v4.sin_family); | |
597 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
598 | retval = sctp_add_bind_addr(bp, &saveaddr, | |
599 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
600 | addr_buf += af->sockaddr_len; | |
601 | } | |
602 | } | |
603 | ||
604 | out: | |
605 | return retval; | |
606 | } | |
607 | ||
608 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
609 | * last address. | |
610 | * | |
611 | * Basically run through each address specified in the addrs/addrcnt | |
612 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
613 | * sctp_del_bind() on it. | |
614 | * | |
615 | * If any of them fails, then the operation will be reversed and the | |
616 | * ones that were removed will be added back. | |
617 | * | |
618 | * At least one address has to be left; if only one address is | |
619 | * available, the operation will return -EBUSY. | |
620 | * | |
621 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
622 | */ | |
623 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) | |
624 | { | |
625 | struct sctp_sock *sp = sctp_sk(sk); | |
626 | struct sctp_endpoint *ep = sp->ep; | |
627 | int cnt; | |
628 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
629 | int retval = 0; | |
630 | void *addr_buf; | |
631 | union sctp_addr *sa_addr; | |
632 | struct sctp_af *af; | |
633 | ||
634 | SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n", | |
635 | sk, addrs, addrcnt); | |
636 | ||
637 | addr_buf = addrs; | |
638 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
639 | /* If the bind address list is empty or if there is only one | |
640 | * bind address, there is nothing more to be removed (we need | |
641 | * at least one address here). | |
642 | */ | |
643 | if (list_empty(&bp->address_list) || | |
644 | (sctp_list_single_entry(&bp->address_list))) { | |
645 | retval = -EBUSY; | |
646 | goto err_bindx_rem; | |
647 | } | |
648 | ||
649 | sa_addr = (union sctp_addr *)addr_buf; | |
650 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
651 | if (!af) { | |
652 | retval = -EINVAL; | |
653 | goto err_bindx_rem; | |
654 | } | |
655 | ||
656 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
657 | retval = -EADDRNOTAVAIL; | |
658 | goto err_bindx_rem; | |
659 | } | |
660 | ||
661 | if (sa_addr->v4.sin_port != htons(bp->port)) { | |
662 | retval = -EINVAL; | |
663 | goto err_bindx_rem; | |
664 | } | |
665 | ||
666 | /* FIXME - There is probably a need to check if sk->sk_saddr and | |
667 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
668 | * be removed. This is something which needs to be looked into | |
669 | * when we are fixing the outstanding issues with multi-homing | |
670 | * socket routing and failover schemes. Refer to comments in | |
671 | * sctp_do_bind(). -daisy | |
672 | */ | |
673 | retval = sctp_del_bind_addr(bp, sa_addr); | |
674 | ||
675 | addr_buf += af->sockaddr_len; | |
676 | err_bindx_rem: | |
677 | if (retval < 0) { | |
678 | /* Failed. Add the ones that has been removed back */ | |
679 | if (cnt > 0) | |
680 | sctp_bindx_add(sk, addrs, cnt); | |
681 | return retval; | |
682 | } | |
683 | } | |
684 | ||
685 | return retval; | |
686 | } | |
687 | ||
688 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
689 | * the associations that are part of the endpoint indicating that a list of | |
690 | * local addresses are removed from the endpoint. | |
691 | * | |
692 | * If any of the addresses is already in the bind address list of the | |
693 | * association, we do not send the chunk for that association. But it will not | |
694 | * affect other associations. | |
695 | * | |
696 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
697 | */ | |
698 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
699 | struct sockaddr *addrs, | |
700 | int addrcnt) | |
701 | { | |
702 | struct sctp_sock *sp; | |
703 | struct sctp_endpoint *ep; | |
704 | struct sctp_association *asoc; | |
705 | struct sctp_transport *transport; | |
706 | struct sctp_bind_addr *bp; | |
707 | struct sctp_chunk *chunk; | |
708 | union sctp_addr *laddr; | |
709 | void *addr_buf; | |
710 | struct sctp_af *af; | |
711 | struct sctp_sockaddr_entry *saddr; | |
712 | int i; | |
713 | int retval = 0; | |
714 | ||
715 | if (!sctp_addip_enable) | |
716 | return retval; | |
717 | ||
718 | sp = sctp_sk(sk); | |
719 | ep = sp->ep; | |
720 | ||
721 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
722 | __func__, sk, addrs, addrcnt); | |
723 | ||
724 | list_for_each_entry(asoc, &ep->asocs, asocs) { | |
725 | ||
726 | if (!asoc->peer.asconf_capable) | |
727 | continue; | |
728 | ||
729 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
730 | continue; | |
731 | ||
732 | if (!sctp_state(asoc, ESTABLISHED)) | |
733 | continue; | |
734 | ||
735 | /* Check if any address in the packed array of addresses is | |
736 | * not present in the bind address list of the association. | |
737 | * If so, do not send the asconf chunk to its peer, but | |
738 | * continue with other associations. | |
739 | */ | |
740 | addr_buf = addrs; | |
741 | for (i = 0; i < addrcnt; i++) { | |
742 | laddr = (union sctp_addr *)addr_buf; | |
743 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
744 | if (!af) { | |
745 | retval = -EINVAL; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
750 | break; | |
751 | ||
752 | addr_buf += af->sockaddr_len; | |
753 | } | |
754 | if (i < addrcnt) | |
755 | continue; | |
756 | ||
757 | /* Find one address in the association's bind address list | |
758 | * that is not in the packed array of addresses. This is to | |
759 | * make sure that we do not delete all the addresses in the | |
760 | * association. | |
761 | */ | |
762 | bp = &asoc->base.bind_addr; | |
763 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
764 | addrcnt, sp); | |
765 | if (!laddr) | |
766 | continue; | |
767 | ||
768 | /* We do not need RCU protection throughout this loop | |
769 | * because this is done under a socket lock from the | |
770 | * setsockopt call. | |
771 | */ | |
772 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, | |
773 | SCTP_PARAM_DEL_IP); | |
774 | if (!chunk) { | |
775 | retval = -ENOMEM; | |
776 | goto out; | |
777 | } | |
778 | ||
779 | /* Reset use_as_src flag for the addresses in the bind address | |
780 | * list that are to be deleted. | |
781 | */ | |
782 | addr_buf = addrs; | |
783 | for (i = 0; i < addrcnt; i++) { | |
784 | laddr = (union sctp_addr *)addr_buf; | |
785 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
786 | list_for_each_entry(saddr, &bp->address_list, list) { | |
787 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) | |
788 | saddr->state = SCTP_ADDR_DEL; | |
789 | } | |
790 | addr_buf += af->sockaddr_len; | |
791 | } | |
792 | ||
793 | /* Update the route and saddr entries for all the transports | |
794 | * as some of the addresses in the bind address list are | |
795 | * about to be deleted and cannot be used as source addresses. | |
796 | */ | |
797 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, | |
798 | transports) { | |
799 | dst_release(transport->dst); | |
800 | sctp_transport_route(transport, NULL, | |
801 | sctp_sk(asoc->base.sk)); | |
802 | } | |
803 | ||
804 | retval = sctp_send_asconf(asoc, chunk); | |
805 | } | |
806 | out: | |
807 | return retval; | |
808 | } | |
809 | ||
810 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() | |
811 | * | |
812 | * API 8.1 | |
813 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
814 | * int flags); | |
815 | * | |
816 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
817 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
818 | * or IPv6 addresses. | |
819 | * | |
820 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
821 | * Section 3.1.2 for this usage. | |
822 | * | |
823 | * addrs is a pointer to an array of one or more socket addresses. Each | |
824 | * address is contained in its appropriate structure (i.e. struct | |
825 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
826 | * must be used to distinguish the address length (note that this | |
827 | * representation is termed a "packed array" of addresses). The caller | |
828 | * specifies the number of addresses in the array with addrcnt. | |
829 | * | |
830 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
831 | * -1, and sets errno to the appropriate error code. | |
832 | * | |
833 | * For SCTP, the port given in each socket address must be the same, or | |
834 | * sctp_bindx() will fail, setting errno to EINVAL. | |
835 | * | |
836 | * The flags parameter is formed from the bitwise OR of zero or more of | |
837 | * the following currently defined flags: | |
838 | * | |
839 | * SCTP_BINDX_ADD_ADDR | |
840 | * | |
841 | * SCTP_BINDX_REM_ADDR | |
842 | * | |
843 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
844 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
845 | * addresses from the association. The two flags are mutually exclusive; | |
846 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
847 | * not remove all addresses from an association; sctp_bindx() will | |
848 | * reject such an attempt with EINVAL. | |
849 | * | |
850 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
851 | * additional addresses with an endpoint after calling bind(). Or use | |
852 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
853 | * socket is associated with so that no new association accepted will be | |
854 | * associated with those addresses. If the endpoint supports dynamic | |
855 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
856 | * endpoint to send the appropriate message to the peer to change the | |
857 | * peers address lists. | |
858 | * | |
859 | * Adding and removing addresses from a connected association is | |
860 | * optional functionality. Implementations that do not support this | |
861 | * functionality should return EOPNOTSUPP. | |
862 | * | |
863 | * Basically do nothing but copying the addresses from user to kernel | |
864 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
865 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() | |
866 | * from userspace. | |
867 | * | |
868 | * We don't use copy_from_user() for optimization: we first do the | |
869 | * sanity checks (buffer size -fast- and access check-healthy | |
870 | * pointer); if all of those succeed, then we can alloc the memory | |
871 | * (expensive operation) needed to copy the data to kernel. Then we do | |
872 | * the copying without checking the user space area | |
873 | * (__copy_from_user()). | |
874 | * | |
875 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
876 | * it. | |
877 | * | |
878 | * sk The sk of the socket | |
879 | * addrs The pointer to the addresses in user land | |
880 | * addrssize Size of the addrs buffer | |
881 | * op Operation to perform (add or remove, see the flags of | |
882 | * sctp_bindx) | |
883 | * | |
884 | * Returns 0 if ok, <0 errno code on error. | |
885 | */ | |
886 | SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk, | |
887 | struct sockaddr __user *addrs, | |
888 | int addrs_size, int op) | |
889 | { | |
890 | struct sockaddr *kaddrs; | |
891 | int err; | |
892 | int addrcnt = 0; | |
893 | int walk_size = 0; | |
894 | struct sockaddr *sa_addr; | |
895 | void *addr_buf; | |
896 | struct sctp_af *af; | |
897 | ||
898 | SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p" | |
899 | " addrs_size %d opt %d\n", sk, addrs, addrs_size, op); | |
900 | ||
901 | if (unlikely(addrs_size <= 0)) | |
902 | return -EINVAL; | |
903 | ||
904 | /* Check the user passed a healthy pointer. */ | |
905 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
906 | return -EFAULT; | |
907 | ||
908 | /* Alloc space for the address array in kernel memory. */ | |
909 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); | |
910 | if (unlikely(!kaddrs)) | |
911 | return -ENOMEM; | |
912 | ||
913 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
914 | kfree(kaddrs); | |
915 | return -EFAULT; | |
916 | } | |
917 | ||
918 | /* Walk through the addrs buffer and count the number of addresses. */ | |
919 | addr_buf = kaddrs; | |
920 | while (walk_size < addrs_size) { | |
921 | if (walk_size + sizeof(sa_family_t) > addrs_size) { | |
922 | kfree(kaddrs); | |
923 | return -EINVAL; | |
924 | } | |
925 | ||
926 | sa_addr = (struct sockaddr *)addr_buf; | |
927 | af = sctp_get_af_specific(sa_addr->sa_family); | |
928 | ||
929 | /* If the address family is not supported or if this address | |
930 | * causes the address buffer to overflow return EINVAL. | |
931 | */ | |
932 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
933 | kfree(kaddrs); | |
934 | return -EINVAL; | |
935 | } | |
936 | addrcnt++; | |
937 | addr_buf += af->sockaddr_len; | |
938 | walk_size += af->sockaddr_len; | |
939 | } | |
940 | ||
941 | /* Do the work. */ | |
942 | switch (op) { | |
943 | case SCTP_BINDX_ADD_ADDR: | |
944 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
945 | if (err) | |
946 | goto out; | |
947 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
948 | break; | |
949 | ||
950 | case SCTP_BINDX_REM_ADDR: | |
951 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
952 | if (err) | |
953 | goto out; | |
954 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
955 | break; | |
956 | ||
957 | default: | |
958 | err = -EINVAL; | |
959 | break; | |
960 | } | |
961 | ||
962 | out: | |
963 | kfree(kaddrs); | |
964 | ||
965 | return err; | |
966 | } | |
967 | ||
968 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) | |
969 | * | |
970 | * Common routine for handling connect() and sctp_connectx(). | |
971 | * Connect will come in with just a single address. | |
972 | */ | |
973 | static int __sctp_connect(struct sock* sk, | |
974 | struct sockaddr *kaddrs, | |
975 | int addrs_size, | |
976 | sctp_assoc_t *assoc_id) | |
977 | { | |
978 | struct sctp_sock *sp; | |
979 | struct sctp_endpoint *ep; | |
980 | struct sctp_association *asoc = NULL; | |
981 | struct sctp_association *asoc2; | |
982 | struct sctp_transport *transport; | |
983 | union sctp_addr to; | |
984 | struct sctp_af *af; | |
985 | sctp_scope_t scope; | |
986 | long timeo; | |
987 | int err = 0; | |
988 | int addrcnt = 0; | |
989 | int walk_size = 0; | |
990 | union sctp_addr *sa_addr = NULL; | |
991 | void *addr_buf; | |
992 | unsigned short port; | |
993 | unsigned int f_flags = 0; | |
994 | ||
995 | sp = sctp_sk(sk); | |
996 | ep = sp->ep; | |
997 | ||
998 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
999 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1000 | * is already connected. | |
1001 | * It cannot be done even on a TCP-style listening socket. | |
1002 | */ | |
1003 | if (sctp_sstate(sk, ESTABLISHED) || | |
1004 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1005 | err = -EISCONN; | |
1006 | goto out_free; | |
1007 | } | |
1008 | ||
1009 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1010 | addr_buf = kaddrs; | |
1011 | while (walk_size < addrs_size) { | |
1012 | if (walk_size + sizeof(sa_family_t) > addrs_size) { | |
1013 | err = -EINVAL; | |
1014 | goto out_free; | |
1015 | } | |
1016 | ||
1017 | sa_addr = (union sctp_addr *)addr_buf; | |
1018 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
1019 | ||
1020 | /* If the address family is not supported or if this address | |
1021 | * causes the address buffer to overflow return EINVAL. | |
1022 | */ | |
1023 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1024 | err = -EINVAL; | |
1025 | goto out_free; | |
1026 | } | |
1027 | ||
1028 | port = ntohs(sa_addr->v4.sin_port); | |
1029 | ||
1030 | /* Save current address so we can work with it */ | |
1031 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1032 | ||
1033 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
1034 | if (err) | |
1035 | goto out_free; | |
1036 | ||
1037 | /* Make sure the destination port is correctly set | |
1038 | * in all addresses. | |
1039 | */ | |
1040 | if (asoc && asoc->peer.port && asoc->peer.port != port) | |
1041 | goto out_free; | |
1042 | ||
1043 | ||
1044 | /* Check if there already is a matching association on the | |
1045 | * endpoint (other than the one created here). | |
1046 | */ | |
1047 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); | |
1048 | if (asoc2 && asoc2 != asoc) { | |
1049 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1050 | err = -EISCONN; | |
1051 | else | |
1052 | err = -EALREADY; | |
1053 | goto out_free; | |
1054 | } | |
1055 | ||
1056 | /* If we could not find a matching association on the endpoint, | |
1057 | * make sure that there is no peeled-off association matching | |
1058 | * the peer address even on another socket. | |
1059 | */ | |
1060 | if (sctp_endpoint_is_peeled_off(ep, &to)) { | |
1061 | err = -EADDRNOTAVAIL; | |
1062 | goto out_free; | |
1063 | } | |
1064 | ||
1065 | if (!asoc) { | |
1066 | /* If a bind() or sctp_bindx() is not called prior to | |
1067 | * an sctp_connectx() call, the system picks an | |
1068 | * ephemeral port and will choose an address set | |
1069 | * equivalent to binding with a wildcard address. | |
1070 | */ | |
1071 | if (!ep->base.bind_addr.port) { | |
1072 | if (sctp_autobind(sk)) { | |
1073 | err = -EAGAIN; | |
1074 | goto out_free; | |
1075 | } | |
1076 | } else { | |
1077 | /* | |
1078 | * If an unprivileged user inherits a 1-many | |
1079 | * style socket with open associations on a | |
1080 | * privileged port, it MAY be permitted to | |
1081 | * accept new associations, but it SHOULD NOT | |
1082 | * be permitted to open new associations. | |
1083 | */ | |
1084 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1085 | !capable(CAP_NET_BIND_SERVICE)) { | |
1086 | err = -EACCES; | |
1087 | goto out_free; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | scope = sctp_scope(&to); | |
1092 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1093 | if (!asoc) { | |
1094 | err = -ENOMEM; | |
1095 | goto out_free; | |
1096 | } | |
1097 | ||
1098 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1099 | GFP_KERNEL); | |
1100 | if (err < 0) { | |
1101 | goto out_free; | |
1102 | } | |
1103 | ||
1104 | } | |
1105 | ||
1106 | /* Prime the peer's transport structures. */ | |
1107 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, | |
1108 | SCTP_UNKNOWN); | |
1109 | if (!transport) { | |
1110 | err = -ENOMEM; | |
1111 | goto out_free; | |
1112 | } | |
1113 | ||
1114 | addrcnt++; | |
1115 | addr_buf += af->sockaddr_len; | |
1116 | walk_size += af->sockaddr_len; | |
1117 | } | |
1118 | ||
1119 | /* In case the user of sctp_connectx() wants an association | |
1120 | * id back, assign one now. | |
1121 | */ | |
1122 | if (assoc_id) { | |
1123 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1124 | if (err < 0) | |
1125 | goto out_free; | |
1126 | } | |
1127 | ||
1128 | err = sctp_primitive_ASSOCIATE(asoc, NULL); | |
1129 | if (err < 0) { | |
1130 | goto out_free; | |
1131 | } | |
1132 | ||
1133 | /* Initialize sk's dport and daddr for getpeername() */ | |
1134 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); | |
1135 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
1136 | af->to_sk_daddr(sa_addr, sk); | |
1137 | sk->sk_err = 0; | |
1138 | ||
1139 | /* in-kernel sockets don't generally have a file allocated to them | |
1140 | * if all they do is call sock_create_kern(). | |
1141 | */ | |
1142 | if (sk->sk_socket->file) | |
1143 | f_flags = sk->sk_socket->file->f_flags; | |
1144 | ||
1145 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1146 | ||
1147 | err = sctp_wait_for_connect(asoc, &timeo); | |
1148 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) | |
1149 | *assoc_id = asoc->assoc_id; | |
1150 | ||
1151 | /* Don't free association on exit. */ | |
1152 | asoc = NULL; | |
1153 | ||
1154 | out_free: | |
1155 | ||
1156 | SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p" | |
1157 | " kaddrs: %p err: %d\n", | |
1158 | asoc, kaddrs, err); | |
1159 | if (asoc) | |
1160 | sctp_association_free(asoc); | |
1161 | return err; | |
1162 | } | |
1163 | ||
1164 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1165 | * | |
1166 | * API 8.9 | |
1167 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, | |
1168 | * sctp_assoc_t *asoc); | |
1169 | * | |
1170 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1171 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1172 | * or IPv6 addresses. | |
1173 | * | |
1174 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1175 | * Section 3.1.2 for this usage. | |
1176 | * | |
1177 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1178 | * address is contained in its appropriate structure (i.e. struct | |
1179 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1180 | * must be used to distengish the address length (note that this | |
1181 | * representation is termed a "packed array" of addresses). The caller | |
1182 | * specifies the number of addresses in the array with addrcnt. | |
1183 | * | |
1184 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to | |
1185 | * the association id of the new association. On failure, sctp_connectx() | |
1186 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1187 | * is not touched by the kernel. | |
1188 | * | |
1189 | * For SCTP, the port given in each socket address must be the same, or | |
1190 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1191 | * | |
1192 | * An application can use sctp_connectx to initiate an association with | |
1193 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1194 | * allows a caller to specify multiple addresses at which a peer can be | |
1195 | * reached. The way the SCTP stack uses the list of addresses to set up | |
1196 | * the association is implementation dependant. This function only | |
1197 | * specifies that the stack will try to make use of all the addresses in | |
1198 | * the list when needed. | |
1199 | * | |
1200 | * Note that the list of addresses passed in is only used for setting up | |
1201 | * the association. It does not necessarily equal the set of addresses | |
1202 | * the peer uses for the resulting association. If the caller wants to | |
1203 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1204 | * retrieve them after the association has been set up. | |
1205 | * | |
1206 | * Basically do nothing but copying the addresses from user to kernel | |
1207 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1208 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1209 | * | |
1210 | * We don't use copy_from_user() for optimization: we first do the | |
1211 | * sanity checks (buffer size -fast- and access check-healthy | |
1212 | * pointer); if all of those succeed, then we can alloc the memory | |
1213 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1214 | * the copying without checking the user space area | |
1215 | * (__copy_from_user()). | |
1216 | * | |
1217 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1218 | * it. | |
1219 | * | |
1220 | * sk The sk of the socket | |
1221 | * addrs The pointer to the addresses in user land | |
1222 | * addrssize Size of the addrs buffer | |
1223 | * | |
1224 | * Returns >=0 if ok, <0 errno code on error. | |
1225 | */ | |
1226 | SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk, | |
1227 | struct sockaddr __user *addrs, | |
1228 | int addrs_size, | |
1229 | sctp_assoc_t *assoc_id) | |
1230 | { | |
1231 | int err = 0; | |
1232 | struct sockaddr *kaddrs; | |
1233 | ||
1234 | SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n", | |
1235 | __func__, sk, addrs, addrs_size); | |
1236 | ||
1237 | if (unlikely(addrs_size <= 0)) | |
1238 | return -EINVAL; | |
1239 | ||
1240 | /* Check the user passed a healthy pointer. */ | |
1241 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1242 | return -EFAULT; | |
1243 | ||
1244 | /* Alloc space for the address array in kernel memory. */ | |
1245 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); | |
1246 | if (unlikely(!kaddrs)) | |
1247 | return -ENOMEM; | |
1248 | ||
1249 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1250 | err = -EFAULT; | |
1251 | } else { | |
1252 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); | |
1253 | } | |
1254 | ||
1255 | kfree(kaddrs); | |
1256 | ||
1257 | return err; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * This is an older interface. It's kept for backward compatibility | |
1262 | * to the option that doesn't provide association id. | |
1263 | */ | |
1264 | SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk, | |
1265 | struct sockaddr __user *addrs, | |
1266 | int addrs_size) | |
1267 | { | |
1268 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * New interface for the API. The since the API is done with a socket | |
1273 | * option, to make it simple we feed back the association id is as a return | |
1274 | * indication to the call. Error is always negative and association id is | |
1275 | * always positive. | |
1276 | */ | |
1277 | SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk, | |
1278 | struct sockaddr __user *addrs, | |
1279 | int addrs_size) | |
1280 | { | |
1281 | sctp_assoc_t assoc_id = 0; | |
1282 | int err = 0; | |
1283 | ||
1284 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1285 | ||
1286 | if (err) | |
1287 | return err; | |
1288 | else | |
1289 | return assoc_id; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * New (hopefully final) interface for the API. | |
1294 | * We use the sctp_getaddrs_old structure so that use-space library | |
1295 | * can avoid any unnecessary allocations. The only defferent part | |
1296 | * is that we store the actual length of the address buffer into the | |
1297 | * addrs_num structure member. That way we can re-use the existing | |
1298 | * code. | |
1299 | */ | |
1300 | SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len, | |
1301 | char __user *optval, | |
1302 | int __user *optlen) | |
1303 | { | |
1304 | struct sctp_getaddrs_old param; | |
1305 | sctp_assoc_t assoc_id = 0; | |
1306 | int err = 0; | |
1307 | ||
1308 | if (len < sizeof(param)) | |
1309 | return -EINVAL; | |
1310 | ||
1311 | if (copy_from_user(¶m, optval, sizeof(param))) | |
1312 | return -EFAULT; | |
1313 | ||
1314 | err = __sctp_setsockopt_connectx(sk, | |
1315 | (struct sockaddr __user *)param.addrs, | |
1316 | param.addr_num, &assoc_id); | |
1317 | ||
1318 | if (err == 0 || err == -EINPROGRESS) { | |
1319 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1320 | return -EFAULT; | |
1321 | if (put_user(sizeof(assoc_id), optlen)) | |
1322 | return -EFAULT; | |
1323 | } | |
1324 | ||
1325 | return err; | |
1326 | } | |
1327 | ||
1328 | /* API 3.1.4 close() - UDP Style Syntax | |
1329 | * Applications use close() to perform graceful shutdown (as described in | |
1330 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1331 | * by a UDP-style socket. | |
1332 | * | |
1333 | * The syntax is | |
1334 | * | |
1335 | * ret = close(int sd); | |
1336 | * | |
1337 | * sd - the socket descriptor of the associations to be closed. | |
1338 | * | |
1339 | * To gracefully shutdown a specific association represented by the | |
1340 | * UDP-style socket, an application should use the sendmsg() call, | |
1341 | * passing no user data, but including the appropriate flag in the | |
1342 | * ancillary data (see Section xxxx). | |
1343 | * | |
1344 | * If sd in the close() call is a branched-off socket representing only | |
1345 | * one association, the shutdown is performed on that association only. | |
1346 | * | |
1347 | * 4.1.6 close() - TCP Style Syntax | |
1348 | * | |
1349 | * Applications use close() to gracefully close down an association. | |
1350 | * | |
1351 | * The syntax is: | |
1352 | * | |
1353 | * int close(int sd); | |
1354 | * | |
1355 | * sd - the socket descriptor of the association to be closed. | |
1356 | * | |
1357 | * After an application calls close() on a socket descriptor, no further | |
1358 | * socket operations will succeed on that descriptor. | |
1359 | * | |
1360 | * API 7.1.4 SO_LINGER | |
1361 | * | |
1362 | * An application using the TCP-style socket can use this option to | |
1363 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1364 | * | |
1365 | * struct linger { | |
1366 | * int l_onoff; // option on/off | |
1367 | * int l_linger; // linger time | |
1368 | * }; | |
1369 | * | |
1370 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1371 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1372 | * value is set to a negative value, the setsockopt() call will return | |
1373 | * an error. If the value is set to a positive value linger_time, the | |
1374 | * close() can be blocked for at most linger_time ms. If the graceful | |
1375 | * shutdown phase does not finish during this period, close() will | |
1376 | * return but the graceful shutdown phase continues in the system. | |
1377 | */ | |
1378 | SCTP_STATIC void sctp_close(struct sock *sk, long timeout) | |
1379 | { | |
1380 | struct sctp_endpoint *ep; | |
1381 | struct sctp_association *asoc; | |
1382 | struct list_head *pos, *temp; | |
1383 | ||
1384 | SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout); | |
1385 | ||
1386 | sctp_lock_sock(sk); | |
1387 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1388 | sk->sk_state = SCTP_SS_CLOSING; | |
1389 | ||
1390 | ep = sctp_sk(sk)->ep; | |
1391 | ||
1392 | /* Walk all associations on an endpoint. */ | |
1393 | list_for_each_safe(pos, temp, &ep->asocs) { | |
1394 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1395 | ||
1396 | if (sctp_style(sk, TCP)) { | |
1397 | /* A closed association can still be in the list if | |
1398 | * it belongs to a TCP-style listening socket that is | |
1399 | * not yet accepted. If so, free it. If not, send an | |
1400 | * ABORT or SHUTDOWN based on the linger options. | |
1401 | */ | |
1402 | if (sctp_state(asoc, CLOSED)) { | |
1403 | sctp_unhash_established(asoc); | |
1404 | sctp_association_free(asoc); | |
1405 | continue; | |
1406 | } | |
1407 | } | |
1408 | ||
1409 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { | |
1410 | struct sctp_chunk *chunk; | |
1411 | ||
1412 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1413 | if (chunk) | |
1414 | sctp_primitive_ABORT(asoc, chunk); | |
1415 | } else | |
1416 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
1417 | } | |
1418 | ||
1419 | /* Clean up any skbs sitting on the receive queue. */ | |
1420 | sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1421 | sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1422 | ||
1423 | /* On a TCP-style socket, block for at most linger_time if set. */ | |
1424 | if (sctp_style(sk, TCP) && timeout) | |
1425 | sctp_wait_for_close(sk, timeout); | |
1426 | ||
1427 | /* This will run the backlog queue. */ | |
1428 | sctp_release_sock(sk); | |
1429 | ||
1430 | /* Supposedly, no process has access to the socket, but | |
1431 | * the net layers still may. | |
1432 | */ | |
1433 | sctp_local_bh_disable(); | |
1434 | sctp_bh_lock_sock(sk); | |
1435 | ||
1436 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1437 | * and we have just a little more cleanup. | |
1438 | */ | |
1439 | sock_hold(sk); | |
1440 | sk_common_release(sk); | |
1441 | ||
1442 | sctp_bh_unlock_sock(sk); | |
1443 | sctp_local_bh_enable(); | |
1444 | ||
1445 | sock_put(sk); | |
1446 | ||
1447 | SCTP_DBG_OBJCNT_DEC(sock); | |
1448 | } | |
1449 | ||
1450 | /* Handle EPIPE error. */ | |
1451 | static int sctp_error(struct sock *sk, int flags, int err) | |
1452 | { | |
1453 | if (err == -EPIPE) | |
1454 | err = sock_error(sk) ? : -EPIPE; | |
1455 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1456 | send_sig(SIGPIPE, current, 0); | |
1457 | return err; | |
1458 | } | |
1459 | ||
1460 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1461 | * | |
1462 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1463 | * and receive data from its peer. | |
1464 | * | |
1465 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1466 | * int flags); | |
1467 | * | |
1468 | * socket - the socket descriptor of the endpoint. | |
1469 | * message - pointer to the msghdr structure which contains a single | |
1470 | * user message and possibly some ancillary data. | |
1471 | * | |
1472 | * See Section 5 for complete description of the data | |
1473 | * structures. | |
1474 | * | |
1475 | * flags - flags sent or received with the user message, see Section | |
1476 | * 5 for complete description of the flags. | |
1477 | * | |
1478 | * Note: This function could use a rewrite especially when explicit | |
1479 | * connect support comes in. | |
1480 | */ | |
1481 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1482 | ||
1483 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); | |
1484 | ||
1485 | SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
1486 | struct msghdr *msg, size_t msg_len) | |
1487 | { | |
1488 | struct sctp_sock *sp; | |
1489 | struct sctp_endpoint *ep; | |
1490 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1491 | struct sctp_transport *transport, *chunk_tp; | |
1492 | struct sctp_chunk *chunk; | |
1493 | union sctp_addr to; | |
1494 | struct sockaddr *msg_name = NULL; | |
1495 | struct sctp_sndrcvinfo default_sinfo = { 0 }; | |
1496 | struct sctp_sndrcvinfo *sinfo; | |
1497 | struct sctp_initmsg *sinit; | |
1498 | sctp_assoc_t associd = 0; | |
1499 | sctp_cmsgs_t cmsgs = { NULL }; | |
1500 | int err; | |
1501 | sctp_scope_t scope; | |
1502 | long timeo; | |
1503 | __u16 sinfo_flags = 0; | |
1504 | struct sctp_datamsg *datamsg; | |
1505 | int msg_flags = msg->msg_flags; | |
1506 | ||
1507 | SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n", | |
1508 | sk, msg, msg_len); | |
1509 | ||
1510 | err = 0; | |
1511 | sp = sctp_sk(sk); | |
1512 | ep = sp->ep; | |
1513 | ||
1514 | SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep); | |
1515 | ||
1516 | /* We cannot send a message over a TCP-style listening socket. */ | |
1517 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1518 | err = -EPIPE; | |
1519 | goto out_nounlock; | |
1520 | } | |
1521 | ||
1522 | /* Parse out the SCTP CMSGs. */ | |
1523 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1524 | ||
1525 | if (err) { | |
1526 | SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err); | |
1527 | goto out_nounlock; | |
1528 | } | |
1529 | ||
1530 | /* Fetch the destination address for this packet. This | |
1531 | * address only selects the association--it is not necessarily | |
1532 | * the address we will send to. | |
1533 | * For a peeled-off socket, msg_name is ignored. | |
1534 | */ | |
1535 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1536 | int msg_namelen = msg->msg_namelen; | |
1537 | ||
1538 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1539 | msg_namelen); | |
1540 | if (err) | |
1541 | return err; | |
1542 | ||
1543 | if (msg_namelen > sizeof(to)) | |
1544 | msg_namelen = sizeof(to); | |
1545 | memcpy(&to, msg->msg_name, msg_namelen); | |
1546 | msg_name = msg->msg_name; | |
1547 | } | |
1548 | ||
1549 | sinfo = cmsgs.info; | |
1550 | sinit = cmsgs.init; | |
1551 | ||
1552 | /* Did the user specify SNDRCVINFO? */ | |
1553 | if (sinfo) { | |
1554 | sinfo_flags = sinfo->sinfo_flags; | |
1555 | associd = sinfo->sinfo_assoc_id; | |
1556 | } | |
1557 | ||
1558 | SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n", | |
1559 | msg_len, sinfo_flags); | |
1560 | ||
1561 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ | |
1562 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1563 | err = -EINVAL; | |
1564 | goto out_nounlock; | |
1565 | } | |
1566 | ||
1567 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero | |
1568 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1569 | * If SCTP_ABORT is set, the message length could be non zero with | |
1570 | * the msg_iov set to the user abort reason. | |
1571 | */ | |
1572 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || | |
1573 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1574 | err = -EINVAL; | |
1575 | goto out_nounlock; | |
1576 | } | |
1577 | ||
1578 | /* If SCTP_ADDR_OVER is set, there must be an address | |
1579 | * specified in msg_name. | |
1580 | */ | |
1581 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { | |
1582 | err = -EINVAL; | |
1583 | goto out_nounlock; | |
1584 | } | |
1585 | ||
1586 | transport = NULL; | |
1587 | ||
1588 | SCTP_DEBUG_PRINTK("About to look up association.\n"); | |
1589 | ||
1590 | sctp_lock_sock(sk); | |
1591 | ||
1592 | /* If a msg_name has been specified, assume this is to be used. */ | |
1593 | if (msg_name) { | |
1594 | /* Look for a matching association on the endpoint. */ | |
1595 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); | |
1596 | if (!asoc) { | |
1597 | /* If we could not find a matching association on the | |
1598 | * endpoint, make sure that it is not a TCP-style | |
1599 | * socket that already has an association or there is | |
1600 | * no peeled-off association on another socket. | |
1601 | */ | |
1602 | if ((sctp_style(sk, TCP) && | |
1603 | sctp_sstate(sk, ESTABLISHED)) || | |
1604 | sctp_endpoint_is_peeled_off(ep, &to)) { | |
1605 | err = -EADDRNOTAVAIL; | |
1606 | goto out_unlock; | |
1607 | } | |
1608 | } | |
1609 | } else { | |
1610 | asoc = sctp_id2assoc(sk, associd); | |
1611 | if (!asoc) { | |
1612 | err = -EPIPE; | |
1613 | goto out_unlock; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | if (asoc) { | |
1618 | SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc); | |
1619 | ||
1620 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1621 | * socket that has an association in CLOSED state. This can | |
1622 | * happen when an accepted socket has an association that is | |
1623 | * already CLOSED. | |
1624 | */ | |
1625 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1626 | err = -EPIPE; | |
1627 | goto out_unlock; | |
1628 | } | |
1629 | ||
1630 | if (sinfo_flags & SCTP_EOF) { | |
1631 | SCTP_DEBUG_PRINTK("Shutting down association: %p\n", | |
1632 | asoc); | |
1633 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
1634 | err = 0; | |
1635 | goto out_unlock; | |
1636 | } | |
1637 | if (sinfo_flags & SCTP_ABORT) { | |
1638 | ||
1639 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1640 | if (!chunk) { | |
1641 | err = -ENOMEM; | |
1642 | goto out_unlock; | |
1643 | } | |
1644 | ||
1645 | SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc); | |
1646 | sctp_primitive_ABORT(asoc, chunk); | |
1647 | err = 0; | |
1648 | goto out_unlock; | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | /* Do we need to create the association? */ | |
1653 | if (!asoc) { | |
1654 | SCTP_DEBUG_PRINTK("There is no association yet.\n"); | |
1655 | ||
1656 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { | |
1657 | err = -EINVAL; | |
1658 | goto out_unlock; | |
1659 | } | |
1660 | ||
1661 | /* Check for invalid stream against the stream counts, | |
1662 | * either the default or the user specified stream counts. | |
1663 | */ | |
1664 | if (sinfo) { | |
1665 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1666 | /* Check against the defaults. */ | |
1667 | if (sinfo->sinfo_stream >= | |
1668 | sp->initmsg.sinit_num_ostreams) { | |
1669 | err = -EINVAL; | |
1670 | goto out_unlock; | |
1671 | } | |
1672 | } else { | |
1673 | /* Check against the requested. */ | |
1674 | if (sinfo->sinfo_stream >= | |
1675 | sinit->sinit_num_ostreams) { | |
1676 | err = -EINVAL; | |
1677 | goto out_unlock; | |
1678 | } | |
1679 | } | |
1680 | } | |
1681 | ||
1682 | /* | |
1683 | * API 3.1.2 bind() - UDP Style Syntax | |
1684 | * If a bind() or sctp_bindx() is not called prior to a | |
1685 | * sendmsg() call that initiates a new association, the | |
1686 | * system picks an ephemeral port and will choose an address | |
1687 | * set equivalent to binding with a wildcard address. | |
1688 | */ | |
1689 | if (!ep->base.bind_addr.port) { | |
1690 | if (sctp_autobind(sk)) { | |
1691 | err = -EAGAIN; | |
1692 | goto out_unlock; | |
1693 | } | |
1694 | } else { | |
1695 | /* | |
1696 | * If an unprivileged user inherits a one-to-many | |
1697 | * style socket with open associations on a privileged | |
1698 | * port, it MAY be permitted to accept new associations, | |
1699 | * but it SHOULD NOT be permitted to open new | |
1700 | * associations. | |
1701 | */ | |
1702 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1703 | !capable(CAP_NET_BIND_SERVICE)) { | |
1704 | err = -EACCES; | |
1705 | goto out_unlock; | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | scope = sctp_scope(&to); | |
1710 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1711 | if (!new_asoc) { | |
1712 | err = -ENOMEM; | |
1713 | goto out_unlock; | |
1714 | } | |
1715 | asoc = new_asoc; | |
1716 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); | |
1717 | if (err < 0) { | |
1718 | err = -ENOMEM; | |
1719 | goto out_free; | |
1720 | } | |
1721 | ||
1722 | /* If the SCTP_INIT ancillary data is specified, set all | |
1723 | * the association init values accordingly. | |
1724 | */ | |
1725 | if (sinit) { | |
1726 | if (sinit->sinit_num_ostreams) { | |
1727 | asoc->c.sinit_num_ostreams = | |
1728 | sinit->sinit_num_ostreams; | |
1729 | } | |
1730 | if (sinit->sinit_max_instreams) { | |
1731 | asoc->c.sinit_max_instreams = | |
1732 | sinit->sinit_max_instreams; | |
1733 | } | |
1734 | if (sinit->sinit_max_attempts) { | |
1735 | asoc->max_init_attempts | |
1736 | = sinit->sinit_max_attempts; | |
1737 | } | |
1738 | if (sinit->sinit_max_init_timeo) { | |
1739 | asoc->max_init_timeo = | |
1740 | msecs_to_jiffies(sinit->sinit_max_init_timeo); | |
1741 | } | |
1742 | } | |
1743 | ||
1744 | /* Prime the peer's transport structures. */ | |
1745 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); | |
1746 | if (!transport) { | |
1747 | err = -ENOMEM; | |
1748 | goto out_free; | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | /* ASSERT: we have a valid association at this point. */ | |
1753 | SCTP_DEBUG_PRINTK("We have a valid association.\n"); | |
1754 | ||
1755 | if (!sinfo) { | |
1756 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1757 | * some defaults. | |
1758 | */ | |
1759 | default_sinfo.sinfo_stream = asoc->default_stream; | |
1760 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1761 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1762 | default_sinfo.sinfo_context = asoc->default_context; | |
1763 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1764 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1765 | sinfo = &default_sinfo; | |
1766 | } | |
1767 | ||
1768 | /* API 7.1.7, the sndbuf size per association bounds the | |
1769 | * maximum size of data that can be sent in a single send call. | |
1770 | */ | |
1771 | if (msg_len > sk->sk_sndbuf) { | |
1772 | err = -EMSGSIZE; | |
1773 | goto out_free; | |
1774 | } | |
1775 | ||
1776 | if (asoc->pmtu_pending) | |
1777 | sctp_assoc_pending_pmtu(asoc); | |
1778 | ||
1779 | /* If fragmentation is disabled and the message length exceeds the | |
1780 | * association fragmentation point, return EMSGSIZE. The I-D | |
1781 | * does not specify what this error is, but this looks like | |
1782 | * a great fit. | |
1783 | */ | |
1784 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1785 | err = -EMSGSIZE; | |
1786 | goto out_free; | |
1787 | } | |
1788 | ||
1789 | if (sinfo) { | |
1790 | /* Check for invalid stream. */ | |
1791 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1792 | err = -EINVAL; | |
1793 | goto out_free; | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1798 | if (!sctp_wspace(asoc)) { | |
1799 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1800 | if (err) | |
1801 | goto out_free; | |
1802 | } | |
1803 | ||
1804 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1805 | * to override the primary destination address in the TCP model, or | |
1806 | * when SCTP_ADDR_OVER flag is set in the UDP model. | |
1807 | */ | |
1808 | if ((sctp_style(sk, TCP) && msg_name) || | |
1809 | (sinfo_flags & SCTP_ADDR_OVER)) { | |
1810 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); | |
1811 | if (!chunk_tp) { | |
1812 | err = -EINVAL; | |
1813 | goto out_free; | |
1814 | } | |
1815 | } else | |
1816 | chunk_tp = NULL; | |
1817 | ||
1818 | /* Auto-connect, if we aren't connected already. */ | |
1819 | if (sctp_state(asoc, CLOSED)) { | |
1820 | err = sctp_primitive_ASSOCIATE(asoc, NULL); | |
1821 | if (err < 0) | |
1822 | goto out_free; | |
1823 | SCTP_DEBUG_PRINTK("We associated primitively.\n"); | |
1824 | } | |
1825 | ||
1826 | /* Break the message into multiple chunks of maximum size. */ | |
1827 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
1828 | if (!datamsg) { | |
1829 | err = -ENOMEM; | |
1830 | goto out_free; | |
1831 | } | |
1832 | ||
1833 | /* Now send the (possibly) fragmented message. */ | |
1834 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { | |
1835 | sctp_chunk_hold(chunk); | |
1836 | ||
1837 | /* Do accounting for the write space. */ | |
1838 | sctp_set_owner_w(chunk); | |
1839 | ||
1840 | chunk->transport = chunk_tp; | |
1841 | } | |
1842 | ||
1843 | /* Send it to the lower layers. Note: all chunks | |
1844 | * must either fail or succeed. The lower layer | |
1845 | * works that way today. Keep it that way or this | |
1846 | * breaks. | |
1847 | */ | |
1848 | err = sctp_primitive_SEND(asoc, datamsg); | |
1849 | /* Did the lower layer accept the chunk? */ | |
1850 | if (err) | |
1851 | sctp_datamsg_free(datamsg); | |
1852 | else | |
1853 | sctp_datamsg_put(datamsg); | |
1854 | ||
1855 | SCTP_DEBUG_PRINTK("We sent primitively.\n"); | |
1856 | ||
1857 | if (err) | |
1858 | goto out_free; | |
1859 | else | |
1860 | err = msg_len; | |
1861 | ||
1862 | /* If we are already past ASSOCIATE, the lower | |
1863 | * layers are responsible for association cleanup. | |
1864 | */ | |
1865 | goto out_unlock; | |
1866 | ||
1867 | out_free: | |
1868 | if (new_asoc) | |
1869 | sctp_association_free(asoc); | |
1870 | out_unlock: | |
1871 | sctp_release_sock(sk); | |
1872 | ||
1873 | out_nounlock: | |
1874 | return sctp_error(sk, msg_flags, err); | |
1875 | ||
1876 | #if 0 | |
1877 | do_sock_err: | |
1878 | if (msg_len) | |
1879 | err = msg_len; | |
1880 | else | |
1881 | err = sock_error(sk); | |
1882 | goto out; | |
1883 | ||
1884 | do_interrupted: | |
1885 | if (msg_len) | |
1886 | err = msg_len; | |
1887 | goto out; | |
1888 | #endif /* 0 */ | |
1889 | } | |
1890 | ||
1891 | /* This is an extended version of skb_pull() that removes the data from the | |
1892 | * start of a skb even when data is spread across the list of skb's in the | |
1893 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1894 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1895 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1896 | * could not be removed. | |
1897 | */ | |
1898 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1899 | { | |
1900 | struct sk_buff *list; | |
1901 | int skb_len = skb_headlen(skb); | |
1902 | int rlen; | |
1903 | ||
1904 | if (len <= skb_len) { | |
1905 | __skb_pull(skb, len); | |
1906 | return 0; | |
1907 | } | |
1908 | len -= skb_len; | |
1909 | __skb_pull(skb, skb_len); | |
1910 | ||
1911 | skb_walk_frags(skb, list) { | |
1912 | rlen = sctp_skb_pull(list, len); | |
1913 | skb->len -= (len-rlen); | |
1914 | skb->data_len -= (len-rlen); | |
1915 | ||
1916 | if (!rlen) | |
1917 | return 0; | |
1918 | ||
1919 | len = rlen; | |
1920 | } | |
1921 | ||
1922 | return len; | |
1923 | } | |
1924 | ||
1925 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
1926 | * | |
1927 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
1928 | * int flags); | |
1929 | * | |
1930 | * socket - the socket descriptor of the endpoint. | |
1931 | * message - pointer to the msghdr structure which contains a single | |
1932 | * user message and possibly some ancillary data. | |
1933 | * | |
1934 | * See Section 5 for complete description of the data | |
1935 | * structures. | |
1936 | * | |
1937 | * flags - flags sent or received with the user message, see Section | |
1938 | * 5 for complete description of the flags. | |
1939 | */ | |
1940 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
1941 | ||
1942 | SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, | |
1943 | struct msghdr *msg, size_t len, int noblock, | |
1944 | int flags, int *addr_len) | |
1945 | { | |
1946 | struct sctp_ulpevent *event = NULL; | |
1947 | struct sctp_sock *sp = sctp_sk(sk); | |
1948 | struct sk_buff *skb; | |
1949 | int copied; | |
1950 | int err = 0; | |
1951 | int skb_len; | |
1952 | ||
1953 | SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: " | |
1954 | "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg, | |
1955 | "len", len, "knoblauch", noblock, | |
1956 | "flags", flags, "addr_len", addr_len); | |
1957 | ||
1958 | sctp_lock_sock(sk); | |
1959 | ||
1960 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
1961 | err = -ENOTCONN; | |
1962 | goto out; | |
1963 | } | |
1964 | ||
1965 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
1966 | if (!skb) | |
1967 | goto out; | |
1968 | ||
1969 | /* Get the total length of the skb including any skb's in the | |
1970 | * frag_list. | |
1971 | */ | |
1972 | skb_len = skb->len; | |
1973 | ||
1974 | copied = skb_len; | |
1975 | if (copied > len) | |
1976 | copied = len; | |
1977 | ||
1978 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1979 | ||
1980 | event = sctp_skb2event(skb); | |
1981 | ||
1982 | if (err) | |
1983 | goto out_free; | |
1984 | ||
1985 | sock_recv_ts_and_drops(msg, sk, skb); | |
1986 | if (sctp_ulpevent_is_notification(event)) { | |
1987 | msg->msg_flags |= MSG_NOTIFICATION; | |
1988 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
1989 | } else { | |
1990 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
1991 | } | |
1992 | ||
1993 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
1994 | if (sp->subscribe.sctp_data_io_event) | |
1995 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
1996 | #if 0 | |
1997 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
1998 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
1999 | ip_cmsg_recv(msg, skb); | |
2000 | #endif | |
2001 | ||
2002 | err = copied; | |
2003 | ||
2004 | /* If skb's length exceeds the user's buffer, update the skb and | |
2005 | * push it back to the receive_queue so that the next call to | |
2006 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2007 | */ | |
2008 | if (skb_len > copied) { | |
2009 | msg->msg_flags &= ~MSG_EOR; | |
2010 | if (flags & MSG_PEEK) | |
2011 | goto out_free; | |
2012 | sctp_skb_pull(skb, copied); | |
2013 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2014 | ||
2015 | /* When only partial message is copied to the user, increase | |
2016 | * rwnd by that amount. If all the data in the skb is read, | |
2017 | * rwnd is updated when the event is freed. | |
2018 | */ | |
2019 | if (!sctp_ulpevent_is_notification(event)) | |
2020 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
2021 | goto out; | |
2022 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2023 | (event->msg_flags & MSG_EOR)) | |
2024 | msg->msg_flags |= MSG_EOR; | |
2025 | else | |
2026 | msg->msg_flags &= ~MSG_EOR; | |
2027 | ||
2028 | out_free: | |
2029 | if (flags & MSG_PEEK) { | |
2030 | /* Release the skb reference acquired after peeking the skb in | |
2031 | * sctp_skb_recv_datagram(). | |
2032 | */ | |
2033 | kfree_skb(skb); | |
2034 | } else { | |
2035 | /* Free the event which includes releasing the reference to | |
2036 | * the owner of the skb, freeing the skb and updating the | |
2037 | * rwnd. | |
2038 | */ | |
2039 | sctp_ulpevent_free(event); | |
2040 | } | |
2041 | out: | |
2042 | sctp_release_sock(sk); | |
2043 | return err; | |
2044 | } | |
2045 | ||
2046 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2047 | * | |
2048 | * This option is a on/off flag. If enabled no SCTP message | |
2049 | * fragmentation will be performed. Instead if a message being sent | |
2050 | * exceeds the current PMTU size, the message will NOT be sent and | |
2051 | * instead a error will be indicated to the user. | |
2052 | */ | |
2053 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
2054 | char __user *optval, | |
2055 | unsigned int optlen) | |
2056 | { | |
2057 | int val; | |
2058 | ||
2059 | if (optlen < sizeof(int)) | |
2060 | return -EINVAL; | |
2061 | ||
2062 | if (get_user(val, (int __user *)optval)) | |
2063 | return -EFAULT; | |
2064 | ||
2065 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2066 | ||
2067 | return 0; | |
2068 | } | |
2069 | ||
2070 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
2071 | unsigned int optlen) | |
2072 | { | |
2073 | if (optlen > sizeof(struct sctp_event_subscribe)) | |
2074 | return -EINVAL; | |
2075 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2076 | return -EFAULT; | |
2077 | return 0; | |
2078 | } | |
2079 | ||
2080 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2081 | * | |
2082 | * This socket option is applicable to the UDP-style socket only. When | |
2083 | * set it will cause associations that are idle for more than the | |
2084 | * specified number of seconds to automatically close. An association | |
2085 | * being idle is defined an association that has NOT sent or received | |
2086 | * user data. The special value of '0' indicates that no automatic | |
2087 | * close of any associations should be performed. The option expects an | |
2088 | * integer defining the number of seconds of idle time before an | |
2089 | * association is closed. | |
2090 | */ | |
2091 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
2092 | unsigned int optlen) | |
2093 | { | |
2094 | struct sctp_sock *sp = sctp_sk(sk); | |
2095 | ||
2096 | /* Applicable to UDP-style socket only */ | |
2097 | if (sctp_style(sk, TCP)) | |
2098 | return -EOPNOTSUPP; | |
2099 | if (optlen != sizeof(int)) | |
2100 | return -EINVAL; | |
2101 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2102 | return -EFAULT; | |
2103 | /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */ | |
2104 | sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ); | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2110 | * | |
2111 | * Applications can enable or disable heartbeats for any peer address of | |
2112 | * an association, modify an address's heartbeat interval, force a | |
2113 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2114 | * number of retransmissions sent before an address is considered | |
2115 | * unreachable. The following structure is used to access and modify an | |
2116 | * address's parameters: | |
2117 | * | |
2118 | * struct sctp_paddrparams { | |
2119 | * sctp_assoc_t spp_assoc_id; | |
2120 | * struct sockaddr_storage spp_address; | |
2121 | * uint32_t spp_hbinterval; | |
2122 | * uint16_t spp_pathmaxrxt; | |
2123 | * uint32_t spp_pathmtu; | |
2124 | * uint32_t spp_sackdelay; | |
2125 | * uint32_t spp_flags; | |
2126 | * }; | |
2127 | * | |
2128 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2129 | * application, and identifies the association for | |
2130 | * this query. | |
2131 | * spp_address - This specifies which address is of interest. | |
2132 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
2133 | * in milliseconds. If a value of zero | |
2134 | * is present in this field then no changes are to | |
2135 | * be made to this parameter. | |
2136 | * spp_pathmaxrxt - This contains the maximum number of | |
2137 | * retransmissions before this address shall be | |
2138 | * considered unreachable. If a value of zero | |
2139 | * is present in this field then no changes are to | |
2140 | * be made to this parameter. | |
2141 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2142 | * specified here will be the "fixed" path mtu. | |
2143 | * Note that if the spp_address field is empty | |
2144 | * then all associations on this address will | |
2145 | * have this fixed path mtu set upon them. | |
2146 | * | |
2147 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2148 | * the number of milliseconds that sacks will be delayed | |
2149 | * for. This value will apply to all addresses of an | |
2150 | * association if the spp_address field is empty. Note | |
2151 | * also, that if delayed sack is enabled and this | |
2152 | * value is set to 0, no change is made to the last | |
2153 | * recorded delayed sack timer value. | |
2154 | * | |
2155 | * spp_flags - These flags are used to control various features | |
2156 | * on an association. The flag field may contain | |
2157 | * zero or more of the following options. | |
2158 | * | |
2159 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2160 | * specified address. Note that if the address | |
2161 | * field is empty all addresses for the association | |
2162 | * have heartbeats enabled upon them. | |
2163 | * | |
2164 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2165 | * speicifed address. Note that if the address | |
2166 | * field is empty all addresses for the association | |
2167 | * will have their heartbeats disabled. Note also | |
2168 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2169 | * mutually exclusive, only one of these two should | |
2170 | * be specified. Enabling both fields will have | |
2171 | * undetermined results. | |
2172 | * | |
2173 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2174 | * to be made immediately. | |
2175 | * | |
2176 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for | |
2177 | * heartbeat delayis to be set to the value of 0 | |
2178 | * milliseconds. | |
2179 | * | |
2180 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
2181 | * discovery upon the specified address. Note that | |
2182 | * if the address feild is empty then all addresses | |
2183 | * on the association are effected. | |
2184 | * | |
2185 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2186 | * discovery upon the specified address. Note that | |
2187 | * if the address feild is empty then all addresses | |
2188 | * on the association are effected. Not also that | |
2189 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2190 | * exclusive. Enabling both will have undetermined | |
2191 | * results. | |
2192 | * | |
2193 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2194 | * on delayed sack. The time specified in spp_sackdelay | |
2195 | * is used to specify the sack delay for this address. Note | |
2196 | * that if spp_address is empty then all addresses will | |
2197 | * enable delayed sack and take on the sack delay | |
2198 | * value specified in spp_sackdelay. | |
2199 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2200 | * off delayed sack. If the spp_address field is blank then | |
2201 | * delayed sack is disabled for the entire association. Note | |
2202 | * also that this field is mutually exclusive to | |
2203 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2204 | * results. | |
2205 | */ | |
2206 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, | |
2207 | struct sctp_transport *trans, | |
2208 | struct sctp_association *asoc, | |
2209 | struct sctp_sock *sp, | |
2210 | int hb_change, | |
2211 | int pmtud_change, | |
2212 | int sackdelay_change) | |
2213 | { | |
2214 | int error; | |
2215 | ||
2216 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
2217 | error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans); | |
2218 | if (error) | |
2219 | return error; | |
2220 | } | |
2221 | ||
2222 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of | |
2223 | * this field is ignored. Note also that a value of zero indicates | |
2224 | * the current setting should be left unchanged. | |
2225 | */ | |
2226 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2227 | ||
2228 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2229 | * set. This lets us use 0 value when this flag | |
2230 | * is set. | |
2231 | */ | |
2232 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2233 | params->spp_hbinterval = 0; | |
2234 | ||
2235 | if (params->spp_hbinterval || | |
2236 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2237 | if (trans) { | |
2238 | trans->hbinterval = | |
2239 | msecs_to_jiffies(params->spp_hbinterval); | |
2240 | } else if (asoc) { | |
2241 | asoc->hbinterval = | |
2242 | msecs_to_jiffies(params->spp_hbinterval); | |
2243 | } else { | |
2244 | sp->hbinterval = params->spp_hbinterval; | |
2245 | } | |
2246 | } | |
2247 | } | |
2248 | ||
2249 | if (hb_change) { | |
2250 | if (trans) { | |
2251 | trans->param_flags = | |
2252 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2253 | } else if (asoc) { | |
2254 | asoc->param_flags = | |
2255 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2256 | } else { | |
2257 | sp->param_flags = | |
2258 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2259 | } | |
2260 | } | |
2261 | ||
2262 | /* When Path MTU discovery is disabled the value specified here will | |
2263 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2264 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2265 | * effect). | |
2266 | */ | |
2267 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
2268 | if (trans) { | |
2269 | trans->pathmtu = params->spp_pathmtu; | |
2270 | sctp_assoc_sync_pmtu(asoc); | |
2271 | } else if (asoc) { | |
2272 | asoc->pathmtu = params->spp_pathmtu; | |
2273 | sctp_frag_point(asoc, params->spp_pathmtu); | |
2274 | } else { | |
2275 | sp->pathmtu = params->spp_pathmtu; | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | if (pmtud_change) { | |
2280 | if (trans) { | |
2281 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2282 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2283 | trans->param_flags = | |
2284 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2285 | if (update) { | |
2286 | sctp_transport_pmtu(trans); | |
2287 | sctp_assoc_sync_pmtu(asoc); | |
2288 | } | |
2289 | } else if (asoc) { | |
2290 | asoc->param_flags = | |
2291 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2292 | } else { | |
2293 | sp->param_flags = | |
2294 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2295 | } | |
2296 | } | |
2297 | ||
2298 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the | |
2299 | * value of this field is ignored. Note also that a value of zero | |
2300 | * indicates the current setting should be left unchanged. | |
2301 | */ | |
2302 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
2303 | if (trans) { | |
2304 | trans->sackdelay = | |
2305 | msecs_to_jiffies(params->spp_sackdelay); | |
2306 | } else if (asoc) { | |
2307 | asoc->sackdelay = | |
2308 | msecs_to_jiffies(params->spp_sackdelay); | |
2309 | } else { | |
2310 | sp->sackdelay = params->spp_sackdelay; | |
2311 | } | |
2312 | } | |
2313 | ||
2314 | if (sackdelay_change) { | |
2315 | if (trans) { | |
2316 | trans->param_flags = | |
2317 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2318 | sackdelay_change; | |
2319 | } else if (asoc) { | |
2320 | asoc->param_flags = | |
2321 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2322 | sackdelay_change; | |
2323 | } else { | |
2324 | sp->param_flags = | |
2325 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2326 | sackdelay_change; | |
2327 | } | |
2328 | } | |
2329 | ||
2330 | /* Note that a value of zero indicates the current setting should be | |
2331 | left unchanged. | |
2332 | */ | |
2333 | if (params->spp_pathmaxrxt) { | |
2334 | if (trans) { | |
2335 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2336 | } else if (asoc) { | |
2337 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2338 | } else { | |
2339 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | return 0; | |
2344 | } | |
2345 | ||
2346 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, | |
2347 | char __user *optval, | |
2348 | unsigned int optlen) | |
2349 | { | |
2350 | struct sctp_paddrparams params; | |
2351 | struct sctp_transport *trans = NULL; | |
2352 | struct sctp_association *asoc = NULL; | |
2353 | struct sctp_sock *sp = sctp_sk(sk); | |
2354 | int error; | |
2355 | int hb_change, pmtud_change, sackdelay_change; | |
2356 | ||
2357 | if (optlen != sizeof(struct sctp_paddrparams)) | |
2358 | return - EINVAL; | |
2359 | ||
2360 | if (copy_from_user(¶ms, optval, optlen)) | |
2361 | return -EFAULT; | |
2362 | ||
2363 | /* Validate flags and value parameters. */ | |
2364 | hb_change = params.spp_flags & SPP_HB; | |
2365 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2366 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2367 | ||
2368 | if (hb_change == SPP_HB || | |
2369 | pmtud_change == SPP_PMTUD || | |
2370 | sackdelay_change == SPP_SACKDELAY || | |
2371 | params.spp_sackdelay > 500 || | |
2372 | (params.spp_pathmtu && | |
2373 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
2374 | return -EINVAL; | |
2375 | ||
2376 | /* If an address other than INADDR_ANY is specified, and | |
2377 | * no transport is found, then the request is invalid. | |
2378 | */ | |
2379 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { | |
2380 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, | |
2381 | params.spp_assoc_id); | |
2382 | if (!trans) | |
2383 | return -EINVAL; | |
2384 | } | |
2385 | ||
2386 | /* Get association, if assoc_id != 0 and the socket is a one | |
2387 | * to many style socket, and an association was not found, then | |
2388 | * the id was invalid. | |
2389 | */ | |
2390 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2391 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
2392 | return -EINVAL; | |
2393 | ||
2394 | /* Heartbeat demand can only be sent on a transport or | |
2395 | * association, but not a socket. | |
2396 | */ | |
2397 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) | |
2398 | return -EINVAL; | |
2399 | ||
2400 | /* Process parameters. */ | |
2401 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2402 | hb_change, pmtud_change, | |
2403 | sackdelay_change); | |
2404 | ||
2405 | if (error) | |
2406 | return error; | |
2407 | ||
2408 | /* If changes are for association, also apply parameters to each | |
2409 | * transport. | |
2410 | */ | |
2411 | if (!trans && asoc) { | |
2412 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
2413 | transports) { | |
2414 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2415 | hb_change, pmtud_change, | |
2416 | sackdelay_change); | |
2417 | } | |
2418 | } | |
2419 | ||
2420 | return 0; | |
2421 | } | |
2422 | ||
2423 | /* | |
2424 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2425 | * | |
2426 | * This option will effect the way delayed acks are performed. This | |
2427 | * option allows you to get or set the delayed ack time, in | |
2428 | * milliseconds. It also allows changing the delayed ack frequency. | |
2429 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2430 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2431 | * values. If the assoc_id field is non-zero, then the set or get | |
2432 | * effects the specified association for the one to many model (the | |
2433 | * assoc_id field is ignored by the one to one model). Note that if | |
2434 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2435 | * current values will remain unchanged. | |
2436 | * | |
2437 | * struct sctp_sack_info { | |
2438 | * sctp_assoc_t sack_assoc_id; | |
2439 | * uint32_t sack_delay; | |
2440 | * uint32_t sack_freq; | |
2441 | * }; | |
2442 | * | |
2443 | * sack_assoc_id - This parameter, indicates which association the user | |
2444 | * is performing an action upon. Note that if this field's value is | |
2445 | * zero then the endpoints default value is changed (effecting future | |
2446 | * associations only). | |
2447 | * | |
2448 | * sack_delay - This parameter contains the number of milliseconds that | |
2449 | * the user is requesting the delayed ACK timer be set to. Note that | |
2450 | * this value is defined in the standard to be between 200 and 500 | |
2451 | * milliseconds. | |
2452 | * | |
2453 | * sack_freq - This parameter contains the number of packets that must | |
2454 | * be received before a sack is sent without waiting for the delay | |
2455 | * timer to expire. The default value for this is 2, setting this | |
2456 | * value to 1 will disable the delayed sack algorithm. | |
2457 | */ | |
2458 | ||
2459 | static int sctp_setsockopt_delayed_ack(struct sock *sk, | |
2460 | char __user *optval, unsigned int optlen) | |
2461 | { | |
2462 | struct sctp_sack_info params; | |
2463 | struct sctp_transport *trans = NULL; | |
2464 | struct sctp_association *asoc = NULL; | |
2465 | struct sctp_sock *sp = sctp_sk(sk); | |
2466 | ||
2467 | if (optlen == sizeof(struct sctp_sack_info)) { | |
2468 | if (copy_from_user(¶ms, optval, optlen)) | |
2469 | return -EFAULT; | |
2470 | ||
2471 | if (params.sack_delay == 0 && params.sack_freq == 0) | |
2472 | return 0; | |
2473 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2474 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); | |
2475 | pr_warn("Use struct sctp_sack_info instead\n"); | |
2476 | if (copy_from_user(¶ms, optval, optlen)) | |
2477 | return -EFAULT; | |
2478 | ||
2479 | if (params.sack_delay == 0) | |
2480 | params.sack_freq = 1; | |
2481 | else | |
2482 | params.sack_freq = 0; | |
2483 | } else | |
2484 | return - EINVAL; | |
2485 | ||
2486 | /* Validate value parameter. */ | |
2487 | if (params.sack_delay > 500) | |
2488 | return -EINVAL; | |
2489 | ||
2490 | /* Get association, if sack_assoc_id != 0 and the socket is a one | |
2491 | * to many style socket, and an association was not found, then | |
2492 | * the id was invalid. | |
2493 | */ | |
2494 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); | |
2495 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
2496 | return -EINVAL; | |
2497 | ||
2498 | if (params.sack_delay) { | |
2499 | if (asoc) { | |
2500 | asoc->sackdelay = | |
2501 | msecs_to_jiffies(params.sack_delay); | |
2502 | asoc->param_flags = | |
2503 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2504 | SPP_SACKDELAY_ENABLE; | |
2505 | } else { | |
2506 | sp->sackdelay = params.sack_delay; | |
2507 | sp->param_flags = | |
2508 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2509 | SPP_SACKDELAY_ENABLE; | |
2510 | } | |
2511 | } | |
2512 | ||
2513 | if (params.sack_freq == 1) { | |
2514 | if (asoc) { | |
2515 | asoc->param_flags = | |
2516 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2517 | SPP_SACKDELAY_DISABLE; | |
2518 | } else { | |
2519 | sp->param_flags = | |
2520 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2521 | SPP_SACKDELAY_DISABLE; | |
2522 | } | |
2523 | } else if (params.sack_freq > 1) { | |
2524 | if (asoc) { | |
2525 | asoc->sackfreq = params.sack_freq; | |
2526 | asoc->param_flags = | |
2527 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2528 | SPP_SACKDELAY_ENABLE; | |
2529 | } else { | |
2530 | sp->sackfreq = params.sack_freq; | |
2531 | sp->param_flags = | |
2532 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2533 | SPP_SACKDELAY_ENABLE; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | /* If change is for association, also apply to each transport. */ | |
2538 | if (asoc) { | |
2539 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
2540 | transports) { | |
2541 | if (params.sack_delay) { | |
2542 | trans->sackdelay = | |
2543 | msecs_to_jiffies(params.sack_delay); | |
2544 | trans->param_flags = | |
2545 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2546 | SPP_SACKDELAY_ENABLE; | |
2547 | } | |
2548 | if (params.sack_freq == 1) { | |
2549 | trans->param_flags = | |
2550 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2551 | SPP_SACKDELAY_DISABLE; | |
2552 | } else if (params.sack_freq > 1) { | |
2553 | trans->sackfreq = params.sack_freq; | |
2554 | trans->param_flags = | |
2555 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2556 | SPP_SACKDELAY_ENABLE; | |
2557 | } | |
2558 | } | |
2559 | } | |
2560 | ||
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) | |
2565 | * | |
2566 | * Applications can specify protocol parameters for the default association | |
2567 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2568 | * is SCTP_INITMSG. | |
2569 | * | |
2570 | * Setting initialization parameters is effective only on an unconnected | |
2571 | * socket (for UDP-style sockets only future associations are effected | |
2572 | * by the change). With TCP-style sockets, this option is inherited by | |
2573 | * sockets derived from a listener socket. | |
2574 | */ | |
2575 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) | |
2576 | { | |
2577 | struct sctp_initmsg sinit; | |
2578 | struct sctp_sock *sp = sctp_sk(sk); | |
2579 | ||
2580 | if (optlen != sizeof(struct sctp_initmsg)) | |
2581 | return -EINVAL; | |
2582 | if (copy_from_user(&sinit, optval, optlen)) | |
2583 | return -EFAULT; | |
2584 | ||
2585 | if (sinit.sinit_num_ostreams) | |
2586 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; | |
2587 | if (sinit.sinit_max_instreams) | |
2588 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; | |
2589 | if (sinit.sinit_max_attempts) | |
2590 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; | |
2591 | if (sinit.sinit_max_init_timeo) | |
2592 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; | |
2593 | ||
2594 | return 0; | |
2595 | } | |
2596 | ||
2597 | /* | |
2598 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2599 | * | |
2600 | * Applications that wish to use the sendto() system call may wish to | |
2601 | * specify a default set of parameters that would normally be supplied | |
2602 | * through the inclusion of ancillary data. This socket option allows | |
2603 | * such an application to set the default sctp_sndrcvinfo structure. | |
2604 | * The application that wishes to use this socket option simply passes | |
2605 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2606 | * 5.2.2) The input parameters accepted by this call include | |
2607 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2608 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2609 | * to this call if the caller is using the UDP model. | |
2610 | */ | |
2611 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
2612 | char __user *optval, | |
2613 | unsigned int optlen) | |
2614 | { | |
2615 | struct sctp_sndrcvinfo info; | |
2616 | struct sctp_association *asoc; | |
2617 | struct sctp_sock *sp = sctp_sk(sk); | |
2618 | ||
2619 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2620 | return -EINVAL; | |
2621 | if (copy_from_user(&info, optval, optlen)) | |
2622 | return -EFAULT; | |
2623 | ||
2624 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2625 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2626 | return -EINVAL; | |
2627 | ||
2628 | if (asoc) { | |
2629 | asoc->default_stream = info.sinfo_stream; | |
2630 | asoc->default_flags = info.sinfo_flags; | |
2631 | asoc->default_ppid = info.sinfo_ppid; | |
2632 | asoc->default_context = info.sinfo_context; | |
2633 | asoc->default_timetolive = info.sinfo_timetolive; | |
2634 | } else { | |
2635 | sp->default_stream = info.sinfo_stream; | |
2636 | sp->default_flags = info.sinfo_flags; | |
2637 | sp->default_ppid = info.sinfo_ppid; | |
2638 | sp->default_context = info.sinfo_context; | |
2639 | sp->default_timetolive = info.sinfo_timetolive; | |
2640 | } | |
2641 | ||
2642 | return 0; | |
2643 | } | |
2644 | ||
2645 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2646 | * | |
2647 | * Requests that the local SCTP stack use the enclosed peer address as | |
2648 | * the association primary. The enclosed address must be one of the | |
2649 | * association peer's addresses. | |
2650 | */ | |
2651 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
2652 | unsigned int optlen) | |
2653 | { | |
2654 | struct sctp_prim prim; | |
2655 | struct sctp_transport *trans; | |
2656 | ||
2657 | if (optlen != sizeof(struct sctp_prim)) | |
2658 | return -EINVAL; | |
2659 | ||
2660 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2661 | return -EFAULT; | |
2662 | ||
2663 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2664 | if (!trans) | |
2665 | return -EINVAL; | |
2666 | ||
2667 | sctp_assoc_set_primary(trans->asoc, trans); | |
2668 | ||
2669 | return 0; | |
2670 | } | |
2671 | ||
2672 | /* | |
2673 | * 7.1.5 SCTP_NODELAY | |
2674 | * | |
2675 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2676 | * generally sent as soon as possible and no unnecessary delays are | |
2677 | * introduced, at the cost of more packets in the network. Expects an | |
2678 | * integer boolean flag. | |
2679 | */ | |
2680 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
2681 | unsigned int optlen) | |
2682 | { | |
2683 | int val; | |
2684 | ||
2685 | if (optlen < sizeof(int)) | |
2686 | return -EINVAL; | |
2687 | if (get_user(val, (int __user *)optval)) | |
2688 | return -EFAULT; | |
2689 | ||
2690 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2691 | return 0; | |
2692 | } | |
2693 | ||
2694 | /* | |
2695 | * | |
2696 | * 7.1.1 SCTP_RTOINFO | |
2697 | * | |
2698 | * The protocol parameters used to initialize and bound retransmission | |
2699 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2700 | * and modify these parameters. | |
2701 | * All parameters are time values, in milliseconds. A value of 0, when | |
2702 | * modifying the parameters, indicates that the current value should not | |
2703 | * be changed. | |
2704 | * | |
2705 | */ | |
2706 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) | |
2707 | { | |
2708 | struct sctp_rtoinfo rtoinfo; | |
2709 | struct sctp_association *asoc; | |
2710 | ||
2711 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2712 | return -EINVAL; | |
2713 | ||
2714 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2715 | return -EFAULT; | |
2716 | ||
2717 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2718 | ||
2719 | /* Set the values to the specific association */ | |
2720 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2721 | return -EINVAL; | |
2722 | ||
2723 | if (asoc) { | |
2724 | if (rtoinfo.srto_initial != 0) | |
2725 | asoc->rto_initial = | |
2726 | msecs_to_jiffies(rtoinfo.srto_initial); | |
2727 | if (rtoinfo.srto_max != 0) | |
2728 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2729 | if (rtoinfo.srto_min != 0) | |
2730 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2731 | } else { | |
2732 | /* If there is no association or the association-id = 0 | |
2733 | * set the values to the endpoint. | |
2734 | */ | |
2735 | struct sctp_sock *sp = sctp_sk(sk); | |
2736 | ||
2737 | if (rtoinfo.srto_initial != 0) | |
2738 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2739 | if (rtoinfo.srto_max != 0) | |
2740 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2741 | if (rtoinfo.srto_min != 0) | |
2742 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2743 | } | |
2744 | ||
2745 | return 0; | |
2746 | } | |
2747 | ||
2748 | /* | |
2749 | * | |
2750 | * 7.1.2 SCTP_ASSOCINFO | |
2751 | * | |
2752 | * This option is used to tune the maximum retransmission attempts | |
2753 | * of the association. | |
2754 | * Returns an error if the new association retransmission value is | |
2755 | * greater than the sum of the retransmission value of the peer. | |
2756 | * See [SCTP] for more information. | |
2757 | * | |
2758 | */ | |
2759 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) | |
2760 | { | |
2761 | ||
2762 | struct sctp_assocparams assocparams; | |
2763 | struct sctp_association *asoc; | |
2764 | ||
2765 | if (optlen != sizeof(struct sctp_assocparams)) | |
2766 | return -EINVAL; | |
2767 | if (copy_from_user(&assocparams, optval, optlen)) | |
2768 | return -EFAULT; | |
2769 | ||
2770 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2771 | ||
2772 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2773 | return -EINVAL; | |
2774 | ||
2775 | /* Set the values to the specific association */ | |
2776 | if (asoc) { | |
2777 | if (assocparams.sasoc_asocmaxrxt != 0) { | |
2778 | __u32 path_sum = 0; | |
2779 | int paths = 0; | |
2780 | struct sctp_transport *peer_addr; | |
2781 | ||
2782 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, | |
2783 | transports) { | |
2784 | path_sum += peer_addr->pathmaxrxt; | |
2785 | paths++; | |
2786 | } | |
2787 | ||
2788 | /* Only validate asocmaxrxt if we have more than | |
2789 | * one path/transport. We do this because path | |
2790 | * retransmissions are only counted when we have more | |
2791 | * then one path. | |
2792 | */ | |
2793 | if (paths > 1 && | |
2794 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2795 | return -EINVAL; | |
2796 | ||
2797 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; | |
2798 | } | |
2799 | ||
2800 | if (assocparams.sasoc_cookie_life != 0) { | |
2801 | asoc->cookie_life.tv_sec = | |
2802 | assocparams.sasoc_cookie_life / 1000; | |
2803 | asoc->cookie_life.tv_usec = | |
2804 | (assocparams.sasoc_cookie_life % 1000) | |
2805 | * 1000; | |
2806 | } | |
2807 | } else { | |
2808 | /* Set the values to the endpoint */ | |
2809 | struct sctp_sock *sp = sctp_sk(sk); | |
2810 | ||
2811 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2812 | sp->assocparams.sasoc_asocmaxrxt = | |
2813 | assocparams.sasoc_asocmaxrxt; | |
2814 | if (assocparams.sasoc_cookie_life != 0) | |
2815 | sp->assocparams.sasoc_cookie_life = | |
2816 | assocparams.sasoc_cookie_life; | |
2817 | } | |
2818 | return 0; | |
2819 | } | |
2820 | ||
2821 | /* | |
2822 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2823 | * | |
2824 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2825 | * addresses. If this option is turned on and the socket is type | |
2826 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2827 | * If this option is turned off, then no mapping will be done of V4 | |
2828 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2829 | * addresses on the socket. | |
2830 | */ | |
2831 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) | |
2832 | { | |
2833 | int val; | |
2834 | struct sctp_sock *sp = sctp_sk(sk); | |
2835 | ||
2836 | if (optlen < sizeof(int)) | |
2837 | return -EINVAL; | |
2838 | if (get_user(val, (int __user *)optval)) | |
2839 | return -EFAULT; | |
2840 | if (val) | |
2841 | sp->v4mapped = 1; | |
2842 | else | |
2843 | sp->v4mapped = 0; | |
2844 | ||
2845 | return 0; | |
2846 | } | |
2847 | ||
2848 | /* | |
2849 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) | |
2850 | * This option will get or set the maximum size to put in any outgoing | |
2851 | * SCTP DATA chunk. If a message is larger than this size it will be | |
2852 | * fragmented by SCTP into the specified size. Note that the underlying | |
2853 | * SCTP implementation may fragment into smaller sized chunks when the | |
2854 | * PMTU of the underlying association is smaller than the value set by | |
2855 | * the user. The default value for this option is '0' which indicates | |
2856 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2857 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2858 | * than the maximum size of an IP datagram will effectively let SCTP | |
2859 | * control fragmentation (i.e. the same as setting this option to 0). | |
2860 | * | |
2861 | * The following structure is used to access and modify this parameter: | |
2862 | * | |
2863 | * struct sctp_assoc_value { | |
2864 | * sctp_assoc_t assoc_id; | |
2865 | * uint32_t assoc_value; | |
2866 | * }; | |
2867 | * | |
2868 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2869 | * For one-to-many style sockets this parameter indicates which | |
2870 | * association the user is performing an action upon. Note that if | |
2871 | * this field's value is zero then the endpoints default value is | |
2872 | * changed (effecting future associations only). | |
2873 | * assoc_value: This parameter specifies the maximum size in bytes. | |
2874 | */ | |
2875 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) | |
2876 | { | |
2877 | struct sctp_assoc_value params; | |
2878 | struct sctp_association *asoc; | |
2879 | struct sctp_sock *sp = sctp_sk(sk); | |
2880 | int val; | |
2881 | ||
2882 | if (optlen == sizeof(int)) { | |
2883 | pr_warn("Use of int in maxseg socket option deprecated\n"); | |
2884 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
2885 | if (copy_from_user(&val, optval, optlen)) | |
2886 | return -EFAULT; | |
2887 | params.assoc_id = 0; | |
2888 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2889 | if (copy_from_user(¶ms, optval, optlen)) | |
2890 | return -EFAULT; | |
2891 | val = params.assoc_value; | |
2892 | } else | |
2893 | return -EINVAL; | |
2894 | ||
2895 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) | |
2896 | return -EINVAL; | |
2897 | ||
2898 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
2899 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
2900 | return -EINVAL; | |
2901 | ||
2902 | if (asoc) { | |
2903 | if (val == 0) { | |
2904 | val = asoc->pathmtu; | |
2905 | val -= sp->pf->af->net_header_len; | |
2906 | val -= sizeof(struct sctphdr) + | |
2907 | sizeof(struct sctp_data_chunk); | |
2908 | } | |
2909 | asoc->user_frag = val; | |
2910 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
2911 | } else { | |
2912 | sp->user_frag = val; | |
2913 | } | |
2914 | ||
2915 | return 0; | |
2916 | } | |
2917 | ||
2918 | ||
2919 | /* | |
2920 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
2921 | * | |
2922 | * Requests that the peer mark the enclosed address as the association | |
2923 | * primary. The enclosed address must be one of the association's | |
2924 | * locally bound addresses. The following structure is used to make a | |
2925 | * set primary request: | |
2926 | */ | |
2927 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
2928 | unsigned int optlen) | |
2929 | { | |
2930 | struct sctp_sock *sp; | |
2931 | struct sctp_endpoint *ep; | |
2932 | struct sctp_association *asoc = NULL; | |
2933 | struct sctp_setpeerprim prim; | |
2934 | struct sctp_chunk *chunk; | |
2935 | int err; | |
2936 | ||
2937 | sp = sctp_sk(sk); | |
2938 | ep = sp->ep; | |
2939 | ||
2940 | if (!sctp_addip_enable) | |
2941 | return -EPERM; | |
2942 | ||
2943 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
2944 | return -EINVAL; | |
2945 | ||
2946 | if (copy_from_user(&prim, optval, optlen)) | |
2947 | return -EFAULT; | |
2948 | ||
2949 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
2950 | if (!asoc) | |
2951 | return -EINVAL; | |
2952 | ||
2953 | if (!asoc->peer.asconf_capable) | |
2954 | return -EPERM; | |
2955 | ||
2956 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
2957 | return -EPERM; | |
2958 | ||
2959 | if (!sctp_state(asoc, ESTABLISHED)) | |
2960 | return -ENOTCONN; | |
2961 | ||
2962 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) | |
2963 | return -EADDRNOTAVAIL; | |
2964 | ||
2965 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
2966 | chunk = sctp_make_asconf_set_prim(asoc, | |
2967 | (union sctp_addr *)&prim.sspp_addr); | |
2968 | if (!chunk) | |
2969 | return -ENOMEM; | |
2970 | ||
2971 | err = sctp_send_asconf(asoc, chunk); | |
2972 | ||
2973 | SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n"); | |
2974 | ||
2975 | return err; | |
2976 | } | |
2977 | ||
2978 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, | |
2979 | unsigned int optlen) | |
2980 | { | |
2981 | struct sctp_setadaptation adaptation; | |
2982 | ||
2983 | if (optlen != sizeof(struct sctp_setadaptation)) | |
2984 | return -EINVAL; | |
2985 | if (copy_from_user(&adaptation, optval, optlen)) | |
2986 | return -EFAULT; | |
2987 | ||
2988 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; | |
2989 | ||
2990 | return 0; | |
2991 | } | |
2992 | ||
2993 | /* | |
2994 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
2995 | * | |
2996 | * The context field in the sctp_sndrcvinfo structure is normally only | |
2997 | * used when a failed message is retrieved holding the value that was | |
2998 | * sent down on the actual send call. This option allows the setting of | |
2999 | * a default context on an association basis that will be received on | |
3000 | * reading messages from the peer. This is especially helpful in the | |
3001 | * one-2-many model for an application to keep some reference to an | |
3002 | * internal state machine that is processing messages on the | |
3003 | * association. Note that the setting of this value only effects | |
3004 | * received messages from the peer and does not effect the value that is | |
3005 | * saved with outbound messages. | |
3006 | */ | |
3007 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
3008 | unsigned int optlen) | |
3009 | { | |
3010 | struct sctp_assoc_value params; | |
3011 | struct sctp_sock *sp; | |
3012 | struct sctp_association *asoc; | |
3013 | ||
3014 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3015 | return -EINVAL; | |
3016 | if (copy_from_user(¶ms, optval, optlen)) | |
3017 | return -EFAULT; | |
3018 | ||
3019 | sp = sctp_sk(sk); | |
3020 | ||
3021 | if (params.assoc_id != 0) { | |
3022 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3023 | if (!asoc) | |
3024 | return -EINVAL; | |
3025 | asoc->default_rcv_context = params.assoc_value; | |
3026 | } else { | |
3027 | sp->default_rcv_context = params.assoc_value; | |
3028 | } | |
3029 | ||
3030 | return 0; | |
3031 | } | |
3032 | ||
3033 | /* | |
3034 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3035 | * | |
3036 | * This options will at a minimum specify if the implementation is doing | |
3037 | * fragmented interleave. Fragmented interleave, for a one to many | |
3038 | * socket, is when subsequent calls to receive a message may return | |
3039 | * parts of messages from different associations. Some implementations | |
3040 | * may allow you to turn this value on or off. If so, when turned off, | |
3041 | * no fragment interleave will occur (which will cause a head of line | |
3042 | * blocking amongst multiple associations sharing the same one to many | |
3043 | * socket). When this option is turned on, then each receive call may | |
3044 | * come from a different association (thus the user must receive data | |
3045 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3046 | * association each receive belongs to. | |
3047 | * | |
3048 | * This option takes a boolean value. A non-zero value indicates that | |
3049 | * fragmented interleave is on. A value of zero indicates that | |
3050 | * fragmented interleave is off. | |
3051 | * | |
3052 | * Note that it is important that an implementation that allows this | |
3053 | * option to be turned on, have it off by default. Otherwise an unaware | |
3054 | * application using the one to many model may become confused and act | |
3055 | * incorrectly. | |
3056 | */ | |
3057 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3058 | char __user *optval, | |
3059 | unsigned int optlen) | |
3060 | { | |
3061 | int val; | |
3062 | ||
3063 | if (optlen != sizeof(int)) | |
3064 | return -EINVAL; | |
3065 | if (get_user(val, (int __user *)optval)) | |
3066 | return -EFAULT; | |
3067 | ||
3068 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3069 | ||
3070 | return 0; | |
3071 | } | |
3072 | ||
3073 | /* | |
3074 | * 8.1.21. Set or Get the SCTP Partial Delivery Point | |
3075 | * (SCTP_PARTIAL_DELIVERY_POINT) | |
3076 | * | |
3077 | * This option will set or get the SCTP partial delivery point. This | |
3078 | * point is the size of a message where the partial delivery API will be | |
3079 | * invoked to help free up rwnd space for the peer. Setting this to a | |
3080 | * lower value will cause partial deliveries to happen more often. The | |
3081 | * calls argument is an integer that sets or gets the partial delivery | |
3082 | * point. Note also that the call will fail if the user attempts to set | |
3083 | * this value larger than the socket receive buffer size. | |
3084 | * | |
3085 | * Note that any single message having a length smaller than or equal to | |
3086 | * the SCTP partial delivery point will be delivered in one single read | |
3087 | * call as long as the user provided buffer is large enough to hold the | |
3088 | * message. | |
3089 | */ | |
3090 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3091 | char __user *optval, | |
3092 | unsigned int optlen) | |
3093 | { | |
3094 | u32 val; | |
3095 | ||
3096 | if (optlen != sizeof(u32)) | |
3097 | return -EINVAL; | |
3098 | if (get_user(val, (int __user *)optval)) | |
3099 | return -EFAULT; | |
3100 | ||
3101 | /* Note: We double the receive buffer from what the user sets | |
3102 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3103 | */ | |
3104 | if (val > (sk->sk_rcvbuf >> 1)) | |
3105 | return -EINVAL; | |
3106 | ||
3107 | sctp_sk(sk)->pd_point = val; | |
3108 | ||
3109 | return 0; /* is this the right error code? */ | |
3110 | } | |
3111 | ||
3112 | /* | |
3113 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3114 | * | |
3115 | * This option will allow a user to change the maximum burst of packets | |
3116 | * that can be emitted by this association. Note that the default value | |
3117 | * is 4, and some implementations may restrict this setting so that it | |
3118 | * can only be lowered. | |
3119 | * | |
3120 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3121 | * future associations inheriting the socket value. | |
3122 | */ | |
3123 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3124 | char __user *optval, | |
3125 | unsigned int optlen) | |
3126 | { | |
3127 | struct sctp_assoc_value params; | |
3128 | struct sctp_sock *sp; | |
3129 | struct sctp_association *asoc; | |
3130 | int val; | |
3131 | int assoc_id = 0; | |
3132 | ||
3133 | if (optlen == sizeof(int)) { | |
3134 | pr_warn("Use of int in max_burst socket option deprecated\n"); | |
3135 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
3136 | if (copy_from_user(&val, optval, optlen)) | |
3137 | return -EFAULT; | |
3138 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3139 | if (copy_from_user(¶ms, optval, optlen)) | |
3140 | return -EFAULT; | |
3141 | val = params.assoc_value; | |
3142 | assoc_id = params.assoc_id; | |
3143 | } else | |
3144 | return -EINVAL; | |
3145 | ||
3146 | sp = sctp_sk(sk); | |
3147 | ||
3148 | if (assoc_id != 0) { | |
3149 | asoc = sctp_id2assoc(sk, assoc_id); | |
3150 | if (!asoc) | |
3151 | return -EINVAL; | |
3152 | asoc->max_burst = val; | |
3153 | } else | |
3154 | sp->max_burst = val; | |
3155 | ||
3156 | return 0; | |
3157 | } | |
3158 | ||
3159 | /* | |
3160 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3161 | * | |
3162 | * This set option adds a chunk type that the user is requesting to be | |
3163 | * received only in an authenticated way. Changes to the list of chunks | |
3164 | * will only effect future associations on the socket. | |
3165 | */ | |
3166 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
3167 | char __user *optval, | |
3168 | unsigned int optlen) | |
3169 | { | |
3170 | struct sctp_authchunk val; | |
3171 | ||
3172 | if (!sctp_auth_enable) | |
3173 | return -EACCES; | |
3174 | ||
3175 | if (optlen != sizeof(struct sctp_authchunk)) | |
3176 | return -EINVAL; | |
3177 | if (copy_from_user(&val, optval, optlen)) | |
3178 | return -EFAULT; | |
3179 | ||
3180 | switch (val.sauth_chunk) { | |
3181 | case SCTP_CID_INIT: | |
3182 | case SCTP_CID_INIT_ACK: | |
3183 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3184 | case SCTP_CID_AUTH: | |
3185 | return -EINVAL; | |
3186 | } | |
3187 | ||
3188 | /* add this chunk id to the endpoint */ | |
3189 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3190 | } | |
3191 | ||
3192 | /* | |
3193 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3194 | * | |
3195 | * This option gets or sets the list of HMAC algorithms that the local | |
3196 | * endpoint requires the peer to use. | |
3197 | */ | |
3198 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
3199 | char __user *optval, | |
3200 | unsigned int optlen) | |
3201 | { | |
3202 | struct sctp_hmacalgo *hmacs; | |
3203 | u32 idents; | |
3204 | int err; | |
3205 | ||
3206 | if (!sctp_auth_enable) | |
3207 | return -EACCES; | |
3208 | ||
3209 | if (optlen < sizeof(struct sctp_hmacalgo)) | |
3210 | return -EINVAL; | |
3211 | ||
3212 | hmacs = kmalloc(optlen, GFP_KERNEL); | |
3213 | if (!hmacs) | |
3214 | return -ENOMEM; | |
3215 | ||
3216 | if (copy_from_user(hmacs, optval, optlen)) { | |
3217 | err = -EFAULT; | |
3218 | goto out; | |
3219 | } | |
3220 | ||
3221 | idents = hmacs->shmac_num_idents; | |
3222 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3223 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
3224 | err = -EINVAL; | |
3225 | goto out; | |
3226 | } | |
3227 | ||
3228 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3229 | out: | |
3230 | kfree(hmacs); | |
3231 | return err; | |
3232 | } | |
3233 | ||
3234 | /* | |
3235 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3236 | * | |
3237 | * This option will set a shared secret key which is used to build an | |
3238 | * association shared key. | |
3239 | */ | |
3240 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3241 | char __user *optval, | |
3242 | unsigned int optlen) | |
3243 | { | |
3244 | struct sctp_authkey *authkey; | |
3245 | struct sctp_association *asoc; | |
3246 | int ret; | |
3247 | ||
3248 | if (!sctp_auth_enable) | |
3249 | return -EACCES; | |
3250 | ||
3251 | if (optlen <= sizeof(struct sctp_authkey)) | |
3252 | return -EINVAL; | |
3253 | ||
3254 | authkey = kmalloc(optlen, GFP_KERNEL); | |
3255 | if (!authkey) | |
3256 | return -ENOMEM; | |
3257 | ||
3258 | if (copy_from_user(authkey, optval, optlen)) { | |
3259 | ret = -EFAULT; | |
3260 | goto out; | |
3261 | } | |
3262 | ||
3263 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { | |
3264 | ret = -EINVAL; | |
3265 | goto out; | |
3266 | } | |
3267 | ||
3268 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); | |
3269 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3270 | ret = -EINVAL; | |
3271 | goto out; | |
3272 | } | |
3273 | ||
3274 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3275 | out: | |
3276 | kfree(authkey); | |
3277 | return ret; | |
3278 | } | |
3279 | ||
3280 | /* | |
3281 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3282 | * | |
3283 | * This option will get or set the active shared key to be used to build | |
3284 | * the association shared key. | |
3285 | */ | |
3286 | static int sctp_setsockopt_active_key(struct sock *sk, | |
3287 | char __user *optval, | |
3288 | unsigned int optlen) | |
3289 | { | |
3290 | struct sctp_authkeyid val; | |
3291 | struct sctp_association *asoc; | |
3292 | ||
3293 | if (!sctp_auth_enable) | |
3294 | return -EACCES; | |
3295 | ||
3296 | if (optlen != sizeof(struct sctp_authkeyid)) | |
3297 | return -EINVAL; | |
3298 | if (copy_from_user(&val, optval, optlen)) | |
3299 | return -EFAULT; | |
3300 | ||
3301 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3302 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3303 | return -EINVAL; | |
3304 | ||
3305 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3306 | val.scact_keynumber); | |
3307 | } | |
3308 | ||
3309 | /* | |
3310 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3311 | * | |
3312 | * This set option will delete a shared secret key from use. | |
3313 | */ | |
3314 | static int sctp_setsockopt_del_key(struct sock *sk, | |
3315 | char __user *optval, | |
3316 | unsigned int optlen) | |
3317 | { | |
3318 | struct sctp_authkeyid val; | |
3319 | struct sctp_association *asoc; | |
3320 | ||
3321 | if (!sctp_auth_enable) | |
3322 | return -EACCES; | |
3323 | ||
3324 | if (optlen != sizeof(struct sctp_authkeyid)) | |
3325 | return -EINVAL; | |
3326 | if (copy_from_user(&val, optval, optlen)) | |
3327 | return -EFAULT; | |
3328 | ||
3329 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3330 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3331 | return -EINVAL; | |
3332 | ||
3333 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3334 | val.scact_keynumber); | |
3335 | ||
3336 | } | |
3337 | ||
3338 | ||
3339 | /* API 6.2 setsockopt(), getsockopt() | |
3340 | * | |
3341 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3342 | * socket options. Socket options are used to change the default | |
3343 | * behavior of sockets calls. They are described in Section 7. | |
3344 | * | |
3345 | * The syntax is: | |
3346 | * | |
3347 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3348 | * int __user *optlen); | |
3349 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3350 | * int optlen); | |
3351 | * | |
3352 | * sd - the socket descript. | |
3353 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3354 | * optname - the option name. | |
3355 | * optval - the buffer to store the value of the option. | |
3356 | * optlen - the size of the buffer. | |
3357 | */ | |
3358 | SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, | |
3359 | char __user *optval, unsigned int optlen) | |
3360 | { | |
3361 | int retval = 0; | |
3362 | ||
3363 | SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n", | |
3364 | sk, optname); | |
3365 | ||
3366 | /* I can hardly begin to describe how wrong this is. This is | |
3367 | * so broken as to be worse than useless. The API draft | |
3368 | * REALLY is NOT helpful here... I am not convinced that the | |
3369 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3370 | * are at all well-founded. | |
3371 | */ | |
3372 | if (level != SOL_SCTP) { | |
3373 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3374 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3375 | goto out_nounlock; | |
3376 | } | |
3377 | ||
3378 | sctp_lock_sock(sk); | |
3379 | ||
3380 | switch (optname) { | |
3381 | case SCTP_SOCKOPT_BINDX_ADD: | |
3382 | /* 'optlen' is the size of the addresses buffer. */ | |
3383 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3384 | optlen, SCTP_BINDX_ADD_ADDR); | |
3385 | break; | |
3386 | ||
3387 | case SCTP_SOCKOPT_BINDX_REM: | |
3388 | /* 'optlen' is the size of the addresses buffer. */ | |
3389 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3390 | optlen, SCTP_BINDX_REM_ADDR); | |
3391 | break; | |
3392 | ||
3393 | case SCTP_SOCKOPT_CONNECTX_OLD: | |
3394 | /* 'optlen' is the size of the addresses buffer. */ | |
3395 | retval = sctp_setsockopt_connectx_old(sk, | |
3396 | (struct sockaddr __user *)optval, | |
3397 | optlen); | |
3398 | break; | |
3399 | ||
3400 | case SCTP_SOCKOPT_CONNECTX: | |
3401 | /* 'optlen' is the size of the addresses buffer. */ | |
3402 | retval = sctp_setsockopt_connectx(sk, | |
3403 | (struct sockaddr __user *)optval, | |
3404 | optlen); | |
3405 | break; | |
3406 | ||
3407 | case SCTP_DISABLE_FRAGMENTS: | |
3408 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3409 | break; | |
3410 | ||
3411 | case SCTP_EVENTS: | |
3412 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3413 | break; | |
3414 | ||
3415 | case SCTP_AUTOCLOSE: | |
3416 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3417 | break; | |
3418 | ||
3419 | case SCTP_PEER_ADDR_PARAMS: | |
3420 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3421 | break; | |
3422 | ||
3423 | case SCTP_DELAYED_ACK: | |
3424 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); | |
3425 | break; | |
3426 | case SCTP_PARTIAL_DELIVERY_POINT: | |
3427 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3428 | break; | |
3429 | ||
3430 | case SCTP_INITMSG: | |
3431 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3432 | break; | |
3433 | case SCTP_DEFAULT_SEND_PARAM: | |
3434 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3435 | optlen); | |
3436 | break; | |
3437 | case SCTP_PRIMARY_ADDR: | |
3438 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3439 | break; | |
3440 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3441 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3442 | break; | |
3443 | case SCTP_NODELAY: | |
3444 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3445 | break; | |
3446 | case SCTP_RTOINFO: | |
3447 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3448 | break; | |
3449 | case SCTP_ASSOCINFO: | |
3450 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3451 | break; | |
3452 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3453 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3454 | break; | |
3455 | case SCTP_MAXSEG: | |
3456 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3457 | break; | |
3458 | case SCTP_ADAPTATION_LAYER: | |
3459 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
3460 | break; | |
3461 | case SCTP_CONTEXT: | |
3462 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3463 | break; | |
3464 | case SCTP_FRAGMENT_INTERLEAVE: | |
3465 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3466 | break; | |
3467 | case SCTP_MAX_BURST: | |
3468 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3469 | break; | |
3470 | case SCTP_AUTH_CHUNK: | |
3471 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3472 | break; | |
3473 | case SCTP_HMAC_IDENT: | |
3474 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3475 | break; | |
3476 | case SCTP_AUTH_KEY: | |
3477 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3478 | break; | |
3479 | case SCTP_AUTH_ACTIVE_KEY: | |
3480 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3481 | break; | |
3482 | case SCTP_AUTH_DELETE_KEY: | |
3483 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3484 | break; | |
3485 | default: | |
3486 | retval = -ENOPROTOOPT; | |
3487 | break; | |
3488 | } | |
3489 | ||
3490 | sctp_release_sock(sk); | |
3491 | ||
3492 | out_nounlock: | |
3493 | return retval; | |
3494 | } | |
3495 | ||
3496 | /* API 3.1.6 connect() - UDP Style Syntax | |
3497 | * | |
3498 | * An application may use the connect() call in the UDP model to initiate an | |
3499 | * association without sending data. | |
3500 | * | |
3501 | * The syntax is: | |
3502 | * | |
3503 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3504 | * | |
3505 | * sd: the socket descriptor to have a new association added to. | |
3506 | * | |
3507 | * nam: the address structure (either struct sockaddr_in or struct | |
3508 | * sockaddr_in6 defined in RFC2553 [7]). | |
3509 | * | |
3510 | * len: the size of the address. | |
3511 | */ | |
3512 | SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr, | |
3513 | int addr_len) | |
3514 | { | |
3515 | int err = 0; | |
3516 | struct sctp_af *af; | |
3517 | ||
3518 | sctp_lock_sock(sk); | |
3519 | ||
3520 | SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n", | |
3521 | __func__, sk, addr, addr_len); | |
3522 | ||
3523 | /* Validate addr_len before calling common connect/connectx routine. */ | |
3524 | af = sctp_get_af_specific(addr->sa_family); | |
3525 | if (!af || addr_len < af->sockaddr_len) { | |
3526 | err = -EINVAL; | |
3527 | } else { | |
3528 | /* Pass correct addr len to common routine (so it knows there | |
3529 | * is only one address being passed. | |
3530 | */ | |
3531 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); | |
3532 | } | |
3533 | ||
3534 | sctp_release_sock(sk); | |
3535 | return err; | |
3536 | } | |
3537 | ||
3538 | /* FIXME: Write comments. */ | |
3539 | SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags) | |
3540 | { | |
3541 | return -EOPNOTSUPP; /* STUB */ | |
3542 | } | |
3543 | ||
3544 | /* 4.1.4 accept() - TCP Style Syntax | |
3545 | * | |
3546 | * Applications use accept() call to remove an established SCTP | |
3547 | * association from the accept queue of the endpoint. A new socket | |
3548 | * descriptor will be returned from accept() to represent the newly | |
3549 | * formed association. | |
3550 | */ | |
3551 | SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err) | |
3552 | { | |
3553 | struct sctp_sock *sp; | |
3554 | struct sctp_endpoint *ep; | |
3555 | struct sock *newsk = NULL; | |
3556 | struct sctp_association *asoc; | |
3557 | long timeo; | |
3558 | int error = 0; | |
3559 | ||
3560 | sctp_lock_sock(sk); | |
3561 | ||
3562 | sp = sctp_sk(sk); | |
3563 | ep = sp->ep; | |
3564 | ||
3565 | if (!sctp_style(sk, TCP)) { | |
3566 | error = -EOPNOTSUPP; | |
3567 | goto out; | |
3568 | } | |
3569 | ||
3570 | if (!sctp_sstate(sk, LISTENING)) { | |
3571 | error = -EINVAL; | |
3572 | goto out; | |
3573 | } | |
3574 | ||
3575 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
3576 | ||
3577 | error = sctp_wait_for_accept(sk, timeo); | |
3578 | if (error) | |
3579 | goto out; | |
3580 | ||
3581 | /* We treat the list of associations on the endpoint as the accept | |
3582 | * queue and pick the first association on the list. | |
3583 | */ | |
3584 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3585 | ||
3586 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3587 | if (!newsk) { | |
3588 | error = -ENOMEM; | |
3589 | goto out; | |
3590 | } | |
3591 | ||
3592 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3593 | * asoc to the newsk. | |
3594 | */ | |
3595 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3596 | ||
3597 | out: | |
3598 | sctp_release_sock(sk); | |
3599 | *err = error; | |
3600 | return newsk; | |
3601 | } | |
3602 | ||
3603 | /* The SCTP ioctl handler. */ | |
3604 | SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
3605 | { | |
3606 | int rc = -ENOTCONN; | |
3607 | ||
3608 | sctp_lock_sock(sk); | |
3609 | ||
3610 | /* | |
3611 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3612 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3613 | */ | |
3614 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3615 | goto out; | |
3616 | ||
3617 | switch (cmd) { | |
3618 | case SIOCINQ: { | |
3619 | struct sk_buff *skb; | |
3620 | unsigned int amount = 0; | |
3621 | ||
3622 | skb = skb_peek(&sk->sk_receive_queue); | |
3623 | if (skb != NULL) { | |
3624 | /* | |
3625 | * We will only return the amount of this packet since | |
3626 | * that is all that will be read. | |
3627 | */ | |
3628 | amount = skb->len; | |
3629 | } | |
3630 | rc = put_user(amount, (int __user *)arg); | |
3631 | break; | |
3632 | } | |
3633 | default: | |
3634 | rc = -ENOIOCTLCMD; | |
3635 | break; | |
3636 | } | |
3637 | out: | |
3638 | sctp_release_sock(sk); | |
3639 | return rc; | |
3640 | } | |
3641 | ||
3642 | /* This is the function which gets called during socket creation to | |
3643 | * initialized the SCTP-specific portion of the sock. | |
3644 | * The sock structure should already be zero-filled memory. | |
3645 | */ | |
3646 | SCTP_STATIC int sctp_init_sock(struct sock *sk) | |
3647 | { | |
3648 | struct sctp_endpoint *ep; | |
3649 | struct sctp_sock *sp; | |
3650 | ||
3651 | SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk); | |
3652 | ||
3653 | sp = sctp_sk(sk); | |
3654 | ||
3655 | /* Initialize the SCTP per socket area. */ | |
3656 | switch (sk->sk_type) { | |
3657 | case SOCK_SEQPACKET: | |
3658 | sp->type = SCTP_SOCKET_UDP; | |
3659 | break; | |
3660 | case SOCK_STREAM: | |
3661 | sp->type = SCTP_SOCKET_TCP; | |
3662 | break; | |
3663 | default: | |
3664 | return -ESOCKTNOSUPPORT; | |
3665 | } | |
3666 | ||
3667 | /* Initialize default send parameters. These parameters can be | |
3668 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3669 | */ | |
3670 | sp->default_stream = 0; | |
3671 | sp->default_ppid = 0; | |
3672 | sp->default_flags = 0; | |
3673 | sp->default_context = 0; | |
3674 | sp->default_timetolive = 0; | |
3675 | ||
3676 | sp->default_rcv_context = 0; | |
3677 | sp->max_burst = sctp_max_burst; | |
3678 | ||
3679 | /* Initialize default setup parameters. These parameters | |
3680 | * can be modified with the SCTP_INITMSG socket option or | |
3681 | * overridden by the SCTP_INIT CMSG. | |
3682 | */ | |
3683 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3684 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
3685 | sp->initmsg.sinit_max_attempts = sctp_max_retrans_init; | |
3686 | sp->initmsg.sinit_max_init_timeo = sctp_rto_max; | |
3687 | ||
3688 | /* Initialize default RTO related parameters. These parameters can | |
3689 | * be modified for with the SCTP_RTOINFO socket option. | |
3690 | */ | |
3691 | sp->rtoinfo.srto_initial = sctp_rto_initial; | |
3692 | sp->rtoinfo.srto_max = sctp_rto_max; | |
3693 | sp->rtoinfo.srto_min = sctp_rto_min; | |
3694 | ||
3695 | /* Initialize default association related parameters. These parameters | |
3696 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3697 | */ | |
3698 | sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association; | |
3699 | sp->assocparams.sasoc_number_peer_destinations = 0; | |
3700 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3701 | sp->assocparams.sasoc_local_rwnd = 0; | |
3702 | sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life; | |
3703 | ||
3704 | /* Initialize default event subscriptions. By default, all the | |
3705 | * options are off. | |
3706 | */ | |
3707 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3708 | ||
3709 | /* Default Peer Address Parameters. These defaults can | |
3710 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3711 | */ | |
3712 | sp->hbinterval = sctp_hb_interval; | |
3713 | sp->pathmaxrxt = sctp_max_retrans_path; | |
3714 | sp->pathmtu = 0; // allow default discovery | |
3715 | sp->sackdelay = sctp_sack_timeout; | |
3716 | sp->sackfreq = 2; | |
3717 | sp->param_flags = SPP_HB_ENABLE | | |
3718 | SPP_PMTUD_ENABLE | | |
3719 | SPP_SACKDELAY_ENABLE; | |
3720 | ||
3721 | /* If enabled no SCTP message fragmentation will be performed. | |
3722 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3723 | */ | |
3724 | sp->disable_fragments = 0; | |
3725 | ||
3726 | /* Enable Nagle algorithm by default. */ | |
3727 | sp->nodelay = 0; | |
3728 | ||
3729 | /* Enable by default. */ | |
3730 | sp->v4mapped = 1; | |
3731 | ||
3732 | /* Auto-close idle associations after the configured | |
3733 | * number of seconds. A value of 0 disables this | |
3734 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3735 | * for UDP-style sockets only. | |
3736 | */ | |
3737 | sp->autoclose = 0; | |
3738 | ||
3739 | /* User specified fragmentation limit. */ | |
3740 | sp->user_frag = 0; | |
3741 | ||
3742 | sp->adaptation_ind = 0; | |
3743 | ||
3744 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3745 | ||
3746 | /* Control variables for partial data delivery. */ | |
3747 | atomic_set(&sp->pd_mode, 0); | |
3748 | skb_queue_head_init(&sp->pd_lobby); | |
3749 | sp->frag_interleave = 0; | |
3750 | ||
3751 | /* Create a per socket endpoint structure. Even if we | |
3752 | * change the data structure relationships, this may still | |
3753 | * be useful for storing pre-connect address information. | |
3754 | */ | |
3755 | ep = sctp_endpoint_new(sk, GFP_KERNEL); | |
3756 | if (!ep) | |
3757 | return -ENOMEM; | |
3758 | ||
3759 | sp->ep = ep; | |
3760 | sp->hmac = NULL; | |
3761 | ||
3762 | SCTP_DBG_OBJCNT_INC(sock); | |
3763 | ||
3764 | local_bh_disable(); | |
3765 | percpu_counter_inc(&sctp_sockets_allocated); | |
3766 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
3767 | local_bh_enable(); | |
3768 | ||
3769 | return 0; | |
3770 | } | |
3771 | ||
3772 | /* Cleanup any SCTP per socket resources. */ | |
3773 | SCTP_STATIC void sctp_destroy_sock(struct sock *sk) | |
3774 | { | |
3775 | struct sctp_endpoint *ep; | |
3776 | ||
3777 | SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk); | |
3778 | ||
3779 | /* Release our hold on the endpoint. */ | |
3780 | ep = sctp_sk(sk)->ep; | |
3781 | sctp_endpoint_free(ep); | |
3782 | local_bh_disable(); | |
3783 | percpu_counter_dec(&sctp_sockets_allocated); | |
3784 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
3785 | local_bh_enable(); | |
3786 | } | |
3787 | ||
3788 | /* API 4.1.7 shutdown() - TCP Style Syntax | |
3789 | * int shutdown(int socket, int how); | |
3790 | * | |
3791 | * sd - the socket descriptor of the association to be closed. | |
3792 | * how - Specifies the type of shutdown. The values are | |
3793 | * as follows: | |
3794 | * SHUT_RD | |
3795 | * Disables further receive operations. No SCTP | |
3796 | * protocol action is taken. | |
3797 | * SHUT_WR | |
3798 | * Disables further send operations, and initiates | |
3799 | * the SCTP shutdown sequence. | |
3800 | * SHUT_RDWR | |
3801 | * Disables further send and receive operations | |
3802 | * and initiates the SCTP shutdown sequence. | |
3803 | */ | |
3804 | SCTP_STATIC void sctp_shutdown(struct sock *sk, int how) | |
3805 | { | |
3806 | struct sctp_endpoint *ep; | |
3807 | struct sctp_association *asoc; | |
3808 | ||
3809 | if (!sctp_style(sk, TCP)) | |
3810 | return; | |
3811 | ||
3812 | if (how & SEND_SHUTDOWN) { | |
3813 | ep = sctp_sk(sk)->ep; | |
3814 | if (!list_empty(&ep->asocs)) { | |
3815 | asoc = list_entry(ep->asocs.next, | |
3816 | struct sctp_association, asocs); | |
3817 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
3818 | } | |
3819 | } | |
3820 | } | |
3821 | ||
3822 | /* 7.2.1 Association Status (SCTP_STATUS) | |
3823 | ||
3824 | * Applications can retrieve current status information about an | |
3825 | * association, including association state, peer receiver window size, | |
3826 | * number of unacked data chunks, and number of data chunks pending | |
3827 | * receipt. This information is read-only. | |
3828 | */ | |
3829 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
3830 | char __user *optval, | |
3831 | int __user *optlen) | |
3832 | { | |
3833 | struct sctp_status status; | |
3834 | struct sctp_association *asoc = NULL; | |
3835 | struct sctp_transport *transport; | |
3836 | sctp_assoc_t associd; | |
3837 | int retval = 0; | |
3838 | ||
3839 | if (len < sizeof(status)) { | |
3840 | retval = -EINVAL; | |
3841 | goto out; | |
3842 | } | |
3843 | ||
3844 | len = sizeof(status); | |
3845 | if (copy_from_user(&status, optval, len)) { | |
3846 | retval = -EFAULT; | |
3847 | goto out; | |
3848 | } | |
3849 | ||
3850 | associd = status.sstat_assoc_id; | |
3851 | asoc = sctp_id2assoc(sk, associd); | |
3852 | if (!asoc) { | |
3853 | retval = -EINVAL; | |
3854 | goto out; | |
3855 | } | |
3856 | ||
3857 | transport = asoc->peer.primary_path; | |
3858 | ||
3859 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
3860 | status.sstat_state = asoc->state; | |
3861 | status.sstat_rwnd = asoc->peer.rwnd; | |
3862 | status.sstat_unackdata = asoc->unack_data; | |
3863 | ||
3864 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
3865 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
3866 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
3867 | status.sstat_fragmentation_point = asoc->frag_point; | |
3868 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3869 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, | |
3870 | transport->af_specific->sockaddr_len); | |
3871 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
3872 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
3873 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3874 | status.sstat_primary.spinfo_state = transport->state; | |
3875 | status.sstat_primary.spinfo_cwnd = transport->cwnd; | |
3876 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
3877 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
3878 | status.sstat_primary.spinfo_mtu = transport->pathmtu; | |
3879 | ||
3880 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) | |
3881 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
3882 | ||
3883 | if (put_user(len, optlen)) { | |
3884 | retval = -EFAULT; | |
3885 | goto out; | |
3886 | } | |
3887 | ||
3888 | SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n", | |
3889 | len, status.sstat_state, status.sstat_rwnd, | |
3890 | status.sstat_assoc_id); | |
3891 | ||
3892 | if (copy_to_user(optval, &status, len)) { | |
3893 | retval = -EFAULT; | |
3894 | goto out; | |
3895 | } | |
3896 | ||
3897 | out: | |
3898 | return retval; | |
3899 | } | |
3900 | ||
3901 | ||
3902 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
3903 | * | |
3904 | * Applications can retrieve information about a specific peer address | |
3905 | * of an association, including its reachability state, congestion | |
3906 | * window, and retransmission timer values. This information is | |
3907 | * read-only. | |
3908 | */ | |
3909 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
3910 | char __user *optval, | |
3911 | int __user *optlen) | |
3912 | { | |
3913 | struct sctp_paddrinfo pinfo; | |
3914 | struct sctp_transport *transport; | |
3915 | int retval = 0; | |
3916 | ||
3917 | if (len < sizeof(pinfo)) { | |
3918 | retval = -EINVAL; | |
3919 | goto out; | |
3920 | } | |
3921 | ||
3922 | len = sizeof(pinfo); | |
3923 | if (copy_from_user(&pinfo, optval, len)) { | |
3924 | retval = -EFAULT; | |
3925 | goto out; | |
3926 | } | |
3927 | ||
3928 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
3929 | pinfo.spinfo_assoc_id); | |
3930 | if (!transport) | |
3931 | return -EINVAL; | |
3932 | ||
3933 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3934 | pinfo.spinfo_state = transport->state; | |
3935 | pinfo.spinfo_cwnd = transport->cwnd; | |
3936 | pinfo.spinfo_srtt = transport->srtt; | |
3937 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
3938 | pinfo.spinfo_mtu = transport->pathmtu; | |
3939 | ||
3940 | if (pinfo.spinfo_state == SCTP_UNKNOWN) | |
3941 | pinfo.spinfo_state = SCTP_ACTIVE; | |
3942 | ||
3943 | if (put_user(len, optlen)) { | |
3944 | retval = -EFAULT; | |
3945 | goto out; | |
3946 | } | |
3947 | ||
3948 | if (copy_to_user(optval, &pinfo, len)) { | |
3949 | retval = -EFAULT; | |
3950 | goto out; | |
3951 | } | |
3952 | ||
3953 | out: | |
3954 | return retval; | |
3955 | } | |
3956 | ||
3957 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
3958 | * | |
3959 | * This option is a on/off flag. If enabled no SCTP message | |
3960 | * fragmentation will be performed. Instead if a message being sent | |
3961 | * exceeds the current PMTU size, the message will NOT be sent and | |
3962 | * instead a error will be indicated to the user. | |
3963 | */ | |
3964 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
3965 | char __user *optval, int __user *optlen) | |
3966 | { | |
3967 | int val; | |
3968 | ||
3969 | if (len < sizeof(int)) | |
3970 | return -EINVAL; | |
3971 | ||
3972 | len = sizeof(int); | |
3973 | val = (sctp_sk(sk)->disable_fragments == 1); | |
3974 | if (put_user(len, optlen)) | |
3975 | return -EFAULT; | |
3976 | if (copy_to_user(optval, &val, len)) | |
3977 | return -EFAULT; | |
3978 | return 0; | |
3979 | } | |
3980 | ||
3981 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
3982 | * | |
3983 | * This socket option is used to specify various notifications and | |
3984 | * ancillary data the user wishes to receive. | |
3985 | */ | |
3986 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
3987 | int __user *optlen) | |
3988 | { | |
3989 | if (len < sizeof(struct sctp_event_subscribe)) | |
3990 | return -EINVAL; | |
3991 | len = sizeof(struct sctp_event_subscribe); | |
3992 | if (put_user(len, optlen)) | |
3993 | return -EFAULT; | |
3994 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) | |
3995 | return -EFAULT; | |
3996 | return 0; | |
3997 | } | |
3998 | ||
3999 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4000 | * | |
4001 | * This socket option is applicable to the UDP-style socket only. When | |
4002 | * set it will cause associations that are idle for more than the | |
4003 | * specified number of seconds to automatically close. An association | |
4004 | * being idle is defined an association that has NOT sent or received | |
4005 | * user data. The special value of '0' indicates that no automatic | |
4006 | * close of any associations should be performed. The option expects an | |
4007 | * integer defining the number of seconds of idle time before an | |
4008 | * association is closed. | |
4009 | */ | |
4010 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4011 | { | |
4012 | /* Applicable to UDP-style socket only */ | |
4013 | if (sctp_style(sk, TCP)) | |
4014 | return -EOPNOTSUPP; | |
4015 | if (len < sizeof(int)) | |
4016 | return -EINVAL; | |
4017 | len = sizeof(int); | |
4018 | if (put_user(len, optlen)) | |
4019 | return -EFAULT; | |
4020 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
4021 | return -EFAULT; | |
4022 | return 0; | |
4023 | } | |
4024 | ||
4025 | /* Helper routine to branch off an association to a new socket. */ | |
4026 | SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc, | |
4027 | struct socket **sockp) | |
4028 | { | |
4029 | struct sock *sk = asoc->base.sk; | |
4030 | struct socket *sock; | |
4031 | struct sctp_af *af; | |
4032 | int err = 0; | |
4033 | ||
4034 | /* An association cannot be branched off from an already peeled-off | |
4035 | * socket, nor is this supported for tcp style sockets. | |
4036 | */ | |
4037 | if (!sctp_style(sk, UDP)) | |
4038 | return -EINVAL; | |
4039 | ||
4040 | /* Create a new socket. */ | |
4041 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4042 | if (err < 0) | |
4043 | return err; | |
4044 | ||
4045 | sctp_copy_sock(sock->sk, sk, asoc); | |
4046 | ||
4047 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4048 | * Set the daddr and initialize id to something more random | |
4049 | */ | |
4050 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); | |
4051 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
4052 | ||
4053 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4054 | * asoc to the newsk. | |
4055 | */ | |
4056 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4057 | ||
4058 | *sockp = sock; | |
4059 | ||
4060 | return err; | |
4061 | } | |
4062 | ||
4063 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4064 | { | |
4065 | sctp_peeloff_arg_t peeloff; | |
4066 | struct socket *newsock; | |
4067 | int retval = 0; | |
4068 | struct sctp_association *asoc; | |
4069 | ||
4070 | if (len < sizeof(sctp_peeloff_arg_t)) | |
4071 | return -EINVAL; | |
4072 | len = sizeof(sctp_peeloff_arg_t); | |
4073 | if (copy_from_user(&peeloff, optval, len)) | |
4074 | return -EFAULT; | |
4075 | ||
4076 | asoc = sctp_id2assoc(sk, peeloff.associd); | |
4077 | if (!asoc) { | |
4078 | retval = -EINVAL; | |
4079 | goto out; | |
4080 | } | |
4081 | ||
4082 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc); | |
4083 | ||
4084 | retval = sctp_do_peeloff(asoc, &newsock); | |
4085 | if (retval < 0) | |
4086 | goto out; | |
4087 | ||
4088 | /* Map the socket to an unused fd that can be returned to the user. */ | |
4089 | retval = sock_map_fd(newsock, 0); | |
4090 | if (retval < 0) { | |
4091 | sock_release(newsock); | |
4092 | goto out; | |
4093 | } | |
4094 | ||
4095 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n", | |
4096 | __func__, sk, asoc, newsock->sk, retval); | |
4097 | ||
4098 | /* Return the fd mapped to the new socket. */ | |
4099 | peeloff.sd = retval; | |
4100 | if (put_user(len, optlen)) | |
4101 | return -EFAULT; | |
4102 | if (copy_to_user(optval, &peeloff, len)) | |
4103 | retval = -EFAULT; | |
4104 | ||
4105 | out: | |
4106 | return retval; | |
4107 | } | |
4108 | ||
4109 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4110 | * | |
4111 | * Applications can enable or disable heartbeats for any peer address of | |
4112 | * an association, modify an address's heartbeat interval, force a | |
4113 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4114 | * number of retransmissions sent before an address is considered | |
4115 | * unreachable. The following structure is used to access and modify an | |
4116 | * address's parameters: | |
4117 | * | |
4118 | * struct sctp_paddrparams { | |
4119 | * sctp_assoc_t spp_assoc_id; | |
4120 | * struct sockaddr_storage spp_address; | |
4121 | * uint32_t spp_hbinterval; | |
4122 | * uint16_t spp_pathmaxrxt; | |
4123 | * uint32_t spp_pathmtu; | |
4124 | * uint32_t spp_sackdelay; | |
4125 | * uint32_t spp_flags; | |
4126 | * }; | |
4127 | * | |
4128 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4129 | * application, and identifies the association for | |
4130 | * this query. | |
4131 | * spp_address - This specifies which address is of interest. | |
4132 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
4133 | * in milliseconds. If a value of zero | |
4134 | * is present in this field then no changes are to | |
4135 | * be made to this parameter. | |
4136 | * spp_pathmaxrxt - This contains the maximum number of | |
4137 | * retransmissions before this address shall be | |
4138 | * considered unreachable. If a value of zero | |
4139 | * is present in this field then no changes are to | |
4140 | * be made to this parameter. | |
4141 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4142 | * specified here will be the "fixed" path mtu. | |
4143 | * Note that if the spp_address field is empty | |
4144 | * then all associations on this address will | |
4145 | * have this fixed path mtu set upon them. | |
4146 | * | |
4147 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4148 | * the number of milliseconds that sacks will be delayed | |
4149 | * for. This value will apply to all addresses of an | |
4150 | * association if the spp_address field is empty. Note | |
4151 | * also, that if delayed sack is enabled and this | |
4152 | * value is set to 0, no change is made to the last | |
4153 | * recorded delayed sack timer value. | |
4154 | * | |
4155 | * spp_flags - These flags are used to control various features | |
4156 | * on an association. The flag field may contain | |
4157 | * zero or more of the following options. | |
4158 | * | |
4159 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4160 | * specified address. Note that if the address | |
4161 | * field is empty all addresses for the association | |
4162 | * have heartbeats enabled upon them. | |
4163 | * | |
4164 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4165 | * speicifed address. Note that if the address | |
4166 | * field is empty all addresses for the association | |
4167 | * will have their heartbeats disabled. Note also | |
4168 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4169 | * mutually exclusive, only one of these two should | |
4170 | * be specified. Enabling both fields will have | |
4171 | * undetermined results. | |
4172 | * | |
4173 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4174 | * to be made immediately. | |
4175 | * | |
4176 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4177 | * discovery upon the specified address. Note that | |
4178 | * if the address feild is empty then all addresses | |
4179 | * on the association are effected. | |
4180 | * | |
4181 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4182 | * discovery upon the specified address. Note that | |
4183 | * if the address feild is empty then all addresses | |
4184 | * on the association are effected. Not also that | |
4185 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4186 | * exclusive. Enabling both will have undetermined | |
4187 | * results. | |
4188 | * | |
4189 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4190 | * on delayed sack. The time specified in spp_sackdelay | |
4191 | * is used to specify the sack delay for this address. Note | |
4192 | * that if spp_address is empty then all addresses will | |
4193 | * enable delayed sack and take on the sack delay | |
4194 | * value specified in spp_sackdelay. | |
4195 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4196 | * off delayed sack. If the spp_address field is blank then | |
4197 | * delayed sack is disabled for the entire association. Note | |
4198 | * also that this field is mutually exclusive to | |
4199 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4200 | * results. | |
4201 | */ | |
4202 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
4203 | char __user *optval, int __user *optlen) | |
4204 | { | |
4205 | struct sctp_paddrparams params; | |
4206 | struct sctp_transport *trans = NULL; | |
4207 | struct sctp_association *asoc = NULL; | |
4208 | struct sctp_sock *sp = sctp_sk(sk); | |
4209 | ||
4210 | if (len < sizeof(struct sctp_paddrparams)) | |
4211 | return -EINVAL; | |
4212 | len = sizeof(struct sctp_paddrparams); | |
4213 | if (copy_from_user(¶ms, optval, len)) | |
4214 | return -EFAULT; | |
4215 | ||
4216 | /* If an address other than INADDR_ANY is specified, and | |
4217 | * no transport is found, then the request is invalid. | |
4218 | */ | |
4219 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { | |
4220 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, | |
4221 | params.spp_assoc_id); | |
4222 | if (!trans) { | |
4223 | SCTP_DEBUG_PRINTK("Failed no transport\n"); | |
4224 | return -EINVAL; | |
4225 | } | |
4226 | } | |
4227 | ||
4228 | /* Get association, if assoc_id != 0 and the socket is a one | |
4229 | * to many style socket, and an association was not found, then | |
4230 | * the id was invalid. | |
4231 | */ | |
4232 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4233 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
4234 | SCTP_DEBUG_PRINTK("Failed no association\n"); | |
4235 | return -EINVAL; | |
4236 | } | |
4237 | ||
4238 | if (trans) { | |
4239 | /* Fetch transport values. */ | |
4240 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4241 | params.spp_pathmtu = trans->pathmtu; | |
4242 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4243 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4244 | ||
4245 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4246 | params.spp_flags = trans->param_flags; | |
4247 | } else if (asoc) { | |
4248 | /* Fetch association values. */ | |
4249 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4250 | params.spp_pathmtu = asoc->pathmtu; | |
4251 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4252 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4253 | ||
4254 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4255 | params.spp_flags = asoc->param_flags; | |
4256 | } else { | |
4257 | /* Fetch socket values. */ | |
4258 | params.spp_hbinterval = sp->hbinterval; | |
4259 | params.spp_pathmtu = sp->pathmtu; | |
4260 | params.spp_sackdelay = sp->sackdelay; | |
4261 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
4262 | ||
4263 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4264 | params.spp_flags = sp->param_flags; | |
4265 | } | |
4266 | ||
4267 | if (copy_to_user(optval, ¶ms, len)) | |
4268 | return -EFAULT; | |
4269 | ||
4270 | if (put_user(len, optlen)) | |
4271 | return -EFAULT; | |
4272 | ||
4273 | return 0; | |
4274 | } | |
4275 | ||
4276 | /* | |
4277 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4278 | * | |
4279 | * This option will effect the way delayed acks are performed. This | |
4280 | * option allows you to get or set the delayed ack time, in | |
4281 | * milliseconds. It also allows changing the delayed ack frequency. | |
4282 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4283 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4284 | * values. If the assoc_id field is non-zero, then the set or get | |
4285 | * effects the specified association for the one to many model (the | |
4286 | * assoc_id field is ignored by the one to one model). Note that if | |
4287 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4288 | * current values will remain unchanged. | |
4289 | * | |
4290 | * struct sctp_sack_info { | |
4291 | * sctp_assoc_t sack_assoc_id; | |
4292 | * uint32_t sack_delay; | |
4293 | * uint32_t sack_freq; | |
4294 | * }; | |
4295 | * | |
4296 | * sack_assoc_id - This parameter, indicates which association the user | |
4297 | * is performing an action upon. Note that if this field's value is | |
4298 | * zero then the endpoints default value is changed (effecting future | |
4299 | * associations only). | |
4300 | * | |
4301 | * sack_delay - This parameter contains the number of milliseconds that | |
4302 | * the user is requesting the delayed ACK timer be set to. Note that | |
4303 | * this value is defined in the standard to be between 200 and 500 | |
4304 | * milliseconds. | |
4305 | * | |
4306 | * sack_freq - This parameter contains the number of packets that must | |
4307 | * be received before a sack is sent without waiting for the delay | |
4308 | * timer to expire. The default value for this is 2, setting this | |
4309 | * value to 1 will disable the delayed sack algorithm. | |
4310 | */ | |
4311 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, | |
4312 | char __user *optval, | |
4313 | int __user *optlen) | |
4314 | { | |
4315 | struct sctp_sack_info params; | |
4316 | struct sctp_association *asoc = NULL; | |
4317 | struct sctp_sock *sp = sctp_sk(sk); | |
4318 | ||
4319 | if (len >= sizeof(struct sctp_sack_info)) { | |
4320 | len = sizeof(struct sctp_sack_info); | |
4321 | ||
4322 | if (copy_from_user(¶ms, optval, len)) | |
4323 | return -EFAULT; | |
4324 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
4325 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); | |
4326 | pr_warn("Use struct sctp_sack_info instead\n"); | |
4327 | if (copy_from_user(¶ms, optval, len)) | |
4328 | return -EFAULT; | |
4329 | } else | |
4330 | return - EINVAL; | |
4331 | ||
4332 | /* Get association, if sack_assoc_id != 0 and the socket is a one | |
4333 | * to many style socket, and an association was not found, then | |
4334 | * the id was invalid. | |
4335 | */ | |
4336 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); | |
4337 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
4338 | return -EINVAL; | |
4339 | ||
4340 | if (asoc) { | |
4341 | /* Fetch association values. */ | |
4342 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { | |
4343 | params.sack_delay = jiffies_to_msecs( | |
4344 | asoc->sackdelay); | |
4345 | params.sack_freq = asoc->sackfreq; | |
4346 | ||
4347 | } else { | |
4348 | params.sack_delay = 0; | |
4349 | params.sack_freq = 1; | |
4350 | } | |
4351 | } else { | |
4352 | /* Fetch socket values. */ | |
4353 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { | |
4354 | params.sack_delay = sp->sackdelay; | |
4355 | params.sack_freq = sp->sackfreq; | |
4356 | } else { | |
4357 | params.sack_delay = 0; | |
4358 | params.sack_freq = 1; | |
4359 | } | |
4360 | } | |
4361 | ||
4362 | if (copy_to_user(optval, ¶ms, len)) | |
4363 | return -EFAULT; | |
4364 | ||
4365 | if (put_user(len, optlen)) | |
4366 | return -EFAULT; | |
4367 | ||
4368 | return 0; | |
4369 | } | |
4370 | ||
4371 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) | |
4372 | * | |
4373 | * Applications can specify protocol parameters for the default association | |
4374 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4375 | * is SCTP_INITMSG. | |
4376 | * | |
4377 | * Setting initialization parameters is effective only on an unconnected | |
4378 | * socket (for UDP-style sockets only future associations are effected | |
4379 | * by the change). With TCP-style sockets, this option is inherited by | |
4380 | * sockets derived from a listener socket. | |
4381 | */ | |
4382 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4383 | { | |
4384 | if (len < sizeof(struct sctp_initmsg)) | |
4385 | return -EINVAL; | |
4386 | len = sizeof(struct sctp_initmsg); | |
4387 | if (put_user(len, optlen)) | |
4388 | return -EFAULT; | |
4389 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) | |
4390 | return -EFAULT; | |
4391 | return 0; | |
4392 | } | |
4393 | ||
4394 | ||
4395 | static int sctp_getsockopt_peer_addrs(struct sock *sk, int len, | |
4396 | char __user *optval, int __user *optlen) | |
4397 | { | |
4398 | struct sctp_association *asoc; | |
4399 | int cnt = 0; | |
4400 | struct sctp_getaddrs getaddrs; | |
4401 | struct sctp_transport *from; | |
4402 | void __user *to; | |
4403 | union sctp_addr temp; | |
4404 | struct sctp_sock *sp = sctp_sk(sk); | |
4405 | int addrlen; | |
4406 | size_t space_left; | |
4407 | int bytes_copied; | |
4408 | ||
4409 | if (len < sizeof(struct sctp_getaddrs)) | |
4410 | return -EINVAL; | |
4411 | ||
4412 | if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs))) | |
4413 | return -EFAULT; | |
4414 | ||
4415 | /* For UDP-style sockets, id specifies the association to query. */ | |
4416 | asoc = sctp_id2assoc(sk, getaddrs.assoc_id); | |
4417 | if (!asoc) | |
4418 | return -EINVAL; | |
4419 | ||
4420 | to = optval + offsetof(struct sctp_getaddrs,addrs); | |
4421 | space_left = len - offsetof(struct sctp_getaddrs,addrs); | |
4422 | ||
4423 | list_for_each_entry(from, &asoc->peer.transport_addr_list, | |
4424 | transports) { | |
4425 | memcpy(&temp, &from->ipaddr, sizeof(temp)); | |
4426 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp); | |
4427 | addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len; | |
4428 | if (space_left < addrlen) | |
4429 | return -ENOMEM; | |
4430 | if (copy_to_user(to, &temp, addrlen)) | |
4431 | return -EFAULT; | |
4432 | to += addrlen; | |
4433 | cnt++; | |
4434 | space_left -= addrlen; | |
4435 | } | |
4436 | ||
4437 | if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) | |
4438 | return -EFAULT; | |
4439 | bytes_copied = ((char __user *)to) - optval; | |
4440 | if (put_user(bytes_copied, optlen)) | |
4441 | return -EFAULT; | |
4442 | ||
4443 | return 0; | |
4444 | } | |
4445 | ||
4446 | static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to, | |
4447 | size_t space_left, int *bytes_copied) | |
4448 | { | |
4449 | struct sctp_sockaddr_entry *addr; | |
4450 | union sctp_addr temp; | |
4451 | int cnt = 0; | |
4452 | int addrlen; | |
4453 | ||
4454 | rcu_read_lock(); | |
4455 | list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { | |
4456 | if (!addr->valid) | |
4457 | continue; | |
4458 | ||
4459 | if ((PF_INET == sk->sk_family) && | |
4460 | (AF_INET6 == addr->a.sa.sa_family)) | |
4461 | continue; | |
4462 | if ((PF_INET6 == sk->sk_family) && | |
4463 | inet_v6_ipv6only(sk) && | |
4464 | (AF_INET == addr->a.sa.sa_family)) | |
4465 | continue; | |
4466 | memcpy(&temp, &addr->a, sizeof(temp)); | |
4467 | if (!temp.v4.sin_port) | |
4468 | temp.v4.sin_port = htons(port); | |
4469 | ||
4470 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
4471 | &temp); | |
4472 | addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len; | |
4473 | if (space_left < addrlen) { | |
4474 | cnt = -ENOMEM; | |
4475 | break; | |
4476 | } | |
4477 | memcpy(to, &temp, addrlen); | |
4478 | ||
4479 | to += addrlen; | |
4480 | cnt ++; | |
4481 | space_left -= addrlen; | |
4482 | *bytes_copied += addrlen; | |
4483 | } | |
4484 | rcu_read_unlock(); | |
4485 | ||
4486 | return cnt; | |
4487 | } | |
4488 | ||
4489 | ||
4490 | static int sctp_getsockopt_local_addrs(struct sock *sk, int len, | |
4491 | char __user *optval, int __user *optlen) | |
4492 | { | |
4493 | struct sctp_bind_addr *bp; | |
4494 | struct sctp_association *asoc; | |
4495 | int cnt = 0; | |
4496 | struct sctp_getaddrs getaddrs; | |
4497 | struct sctp_sockaddr_entry *addr; | |
4498 | void __user *to; | |
4499 | union sctp_addr temp; | |
4500 | struct sctp_sock *sp = sctp_sk(sk); | |
4501 | int addrlen; | |
4502 | int err = 0; | |
4503 | size_t space_left; | |
4504 | int bytes_copied = 0; | |
4505 | void *addrs; | |
4506 | void *buf; | |
4507 | ||
4508 | if (len < sizeof(struct sctp_getaddrs)) | |
4509 | return -EINVAL; | |
4510 | ||
4511 | if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs))) | |
4512 | return -EFAULT; | |
4513 | ||
4514 | /* | |
4515 | * For UDP-style sockets, id specifies the association to query. | |
4516 | * If the id field is set to the value '0' then the locally bound | |
4517 | * addresses are returned without regard to any particular | |
4518 | * association. | |
4519 | */ | |
4520 | if (0 == getaddrs.assoc_id) { | |
4521 | bp = &sctp_sk(sk)->ep->base.bind_addr; | |
4522 | } else { | |
4523 | asoc = sctp_id2assoc(sk, getaddrs.assoc_id); | |
4524 | if (!asoc) | |
4525 | return -EINVAL; | |
4526 | bp = &asoc->base.bind_addr; | |
4527 | } | |
4528 | ||
4529 | to = optval + offsetof(struct sctp_getaddrs,addrs); | |
4530 | space_left = len - offsetof(struct sctp_getaddrs,addrs); | |
4531 | ||
4532 | addrs = kmalloc(space_left, GFP_KERNEL); | |
4533 | if (!addrs) | |
4534 | return -ENOMEM; | |
4535 | ||
4536 | /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid | |
4537 | * addresses from the global local address list. | |
4538 | */ | |
4539 | if (sctp_list_single_entry(&bp->address_list)) { | |
4540 | addr = list_entry(bp->address_list.next, | |
4541 | struct sctp_sockaddr_entry, list); | |
4542 | if (sctp_is_any(sk, &addr->a)) { | |
4543 | cnt = sctp_copy_laddrs(sk, bp->port, addrs, | |
4544 | space_left, &bytes_copied); | |
4545 | if (cnt < 0) { | |
4546 | err = cnt; | |
4547 | goto out; | |
4548 | } | |
4549 | goto copy_getaddrs; | |
4550 | } | |
4551 | } | |
4552 | ||
4553 | buf = addrs; | |
4554 | /* Protection on the bound address list is not needed since | |
4555 | * in the socket option context we hold a socket lock and | |
4556 | * thus the bound address list can't change. | |
4557 | */ | |
4558 | list_for_each_entry(addr, &bp->address_list, list) { | |
4559 | memcpy(&temp, &addr->a, sizeof(temp)); | |
4560 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp); | |
4561 | addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len; | |
4562 | if (space_left < addrlen) { | |
4563 | err = -ENOMEM; /*fixme: right error?*/ | |
4564 | goto out; | |
4565 | } | |
4566 | memcpy(buf, &temp, addrlen); | |
4567 | buf += addrlen; | |
4568 | bytes_copied += addrlen; | |
4569 | cnt ++; | |
4570 | space_left -= addrlen; | |
4571 | } | |
4572 | ||
4573 | copy_getaddrs: | |
4574 | if (copy_to_user(to, addrs, bytes_copied)) { | |
4575 | err = -EFAULT; | |
4576 | goto out; | |
4577 | } | |
4578 | if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) { | |
4579 | err = -EFAULT; | |
4580 | goto out; | |
4581 | } | |
4582 | if (put_user(bytes_copied, optlen)) | |
4583 | err = -EFAULT; | |
4584 | out: | |
4585 | kfree(addrs); | |
4586 | return err; | |
4587 | } | |
4588 | ||
4589 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
4590 | * | |
4591 | * Requests that the local SCTP stack use the enclosed peer address as | |
4592 | * the association primary. The enclosed address must be one of the | |
4593 | * association peer's addresses. | |
4594 | */ | |
4595 | static int sctp_getsockopt_primary_addr(struct sock *sk, int len, | |
4596 | char __user *optval, int __user *optlen) | |
4597 | { | |
4598 | struct sctp_prim prim; | |
4599 | struct sctp_association *asoc; | |
4600 | struct sctp_sock *sp = sctp_sk(sk); | |
4601 | ||
4602 | if (len < sizeof(struct sctp_prim)) | |
4603 | return -EINVAL; | |
4604 | ||
4605 | len = sizeof(struct sctp_prim); | |
4606 | ||
4607 | if (copy_from_user(&prim, optval, len)) | |
4608 | return -EFAULT; | |
4609 | ||
4610 | asoc = sctp_id2assoc(sk, prim.ssp_assoc_id); | |
4611 | if (!asoc) | |
4612 | return -EINVAL; | |
4613 | ||
4614 | if (!asoc->peer.primary_path) | |
4615 | return -ENOTCONN; | |
4616 | ||
4617 | memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr, | |
4618 | asoc->peer.primary_path->af_specific->sockaddr_len); | |
4619 | ||
4620 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, | |
4621 | (union sctp_addr *)&prim.ssp_addr); | |
4622 | ||
4623 | if (put_user(len, optlen)) | |
4624 | return -EFAULT; | |
4625 | if (copy_to_user(optval, &prim, len)) | |
4626 | return -EFAULT; | |
4627 | ||
4628 | return 0; | |
4629 | } | |
4630 | ||
4631 | /* | |
4632 | * 7.1.11 Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER) | |
4633 | * | |
4634 | * Requests that the local endpoint set the specified Adaptation Layer | |
4635 | * Indication parameter for all future INIT and INIT-ACK exchanges. | |
4636 | */ | |
4637 | static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len, | |
4638 | char __user *optval, int __user *optlen) | |
4639 | { | |
4640 | struct sctp_setadaptation adaptation; | |
4641 | ||
4642 | if (len < sizeof(struct sctp_setadaptation)) | |
4643 | return -EINVAL; | |
4644 | ||
4645 | len = sizeof(struct sctp_setadaptation); | |
4646 | ||
4647 | adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind; | |
4648 | ||
4649 | if (put_user(len, optlen)) | |
4650 | return -EFAULT; | |
4651 | if (copy_to_user(optval, &adaptation, len)) | |
4652 | return -EFAULT; | |
4653 | ||
4654 | return 0; | |
4655 | } | |
4656 | ||
4657 | /* | |
4658 | * | |
4659 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
4660 | * | |
4661 | * Applications that wish to use the sendto() system call may wish to | |
4662 | * specify a default set of parameters that would normally be supplied | |
4663 | * through the inclusion of ancillary data. This socket option allows | |
4664 | * such an application to set the default sctp_sndrcvinfo structure. | |
4665 | ||
4666 | ||
4667 | * The application that wishes to use this socket option simply passes | |
4668 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
4669 | * 5.2.2) The input parameters accepted by this call include | |
4670 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
4671 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
4672 | * to this call if the caller is using the UDP model. | |
4673 | * | |
4674 | * For getsockopt, it get the default sctp_sndrcvinfo structure. | |
4675 | */ | |
4676 | static int sctp_getsockopt_default_send_param(struct sock *sk, | |
4677 | int len, char __user *optval, | |
4678 | int __user *optlen) | |
4679 | { | |
4680 | struct sctp_sndrcvinfo info; | |
4681 | struct sctp_association *asoc; | |
4682 | struct sctp_sock *sp = sctp_sk(sk); | |
4683 | ||
4684 | if (len < sizeof(struct sctp_sndrcvinfo)) | |
4685 | return -EINVAL; | |
4686 | ||
4687 | len = sizeof(struct sctp_sndrcvinfo); | |
4688 | ||
4689 | if (copy_from_user(&info, optval, len)) | |
4690 | return -EFAULT; | |
4691 | ||
4692 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
4693 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
4694 | return -EINVAL; | |
4695 | ||
4696 | if (asoc) { | |
4697 | info.sinfo_stream = asoc->default_stream; | |
4698 | info.sinfo_flags = asoc->default_flags; | |
4699 | info.sinfo_ppid = asoc->default_ppid; | |
4700 | info.sinfo_context = asoc->default_context; | |
4701 | info.sinfo_timetolive = asoc->default_timetolive; | |
4702 | } else { | |
4703 | info.sinfo_stream = sp->default_stream; | |
4704 | info.sinfo_flags = sp->default_flags; | |
4705 | info.sinfo_ppid = sp->default_ppid; | |
4706 | info.sinfo_context = sp->default_context; | |
4707 | info.sinfo_timetolive = sp->default_timetolive; | |
4708 | } | |
4709 | ||
4710 | if (put_user(len, optlen)) | |
4711 | return -EFAULT; | |
4712 | if (copy_to_user(optval, &info, len)) | |
4713 | return -EFAULT; | |
4714 | ||
4715 | return 0; | |
4716 | } | |
4717 | ||
4718 | /* | |
4719 | * | |
4720 | * 7.1.5 SCTP_NODELAY | |
4721 | * | |
4722 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
4723 | * generally sent as soon as possible and no unnecessary delays are | |
4724 | * introduced, at the cost of more packets in the network. Expects an | |
4725 | * integer boolean flag. | |
4726 | */ | |
4727 | ||
4728 | static int sctp_getsockopt_nodelay(struct sock *sk, int len, | |
4729 | char __user *optval, int __user *optlen) | |
4730 | { | |
4731 | int val; | |
4732 | ||
4733 | if (len < sizeof(int)) | |
4734 | return -EINVAL; | |
4735 | ||
4736 | len = sizeof(int); | |
4737 | val = (sctp_sk(sk)->nodelay == 1); | |
4738 | if (put_user(len, optlen)) | |
4739 | return -EFAULT; | |
4740 | if (copy_to_user(optval, &val, len)) | |
4741 | return -EFAULT; | |
4742 | return 0; | |
4743 | } | |
4744 | ||
4745 | /* | |
4746 | * | |
4747 | * 7.1.1 SCTP_RTOINFO | |
4748 | * | |
4749 | * The protocol parameters used to initialize and bound retransmission | |
4750 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
4751 | * and modify these parameters. | |
4752 | * All parameters are time values, in milliseconds. A value of 0, when | |
4753 | * modifying the parameters, indicates that the current value should not | |
4754 | * be changed. | |
4755 | * | |
4756 | */ | |
4757 | static int sctp_getsockopt_rtoinfo(struct sock *sk, int len, | |
4758 | char __user *optval, | |
4759 | int __user *optlen) { | |
4760 | struct sctp_rtoinfo rtoinfo; | |
4761 | struct sctp_association *asoc; | |
4762 | ||
4763 | if (len < sizeof (struct sctp_rtoinfo)) | |
4764 | return -EINVAL; | |
4765 | ||
4766 | len = sizeof(struct sctp_rtoinfo); | |
4767 | ||
4768 | if (copy_from_user(&rtoinfo, optval, len)) | |
4769 | return -EFAULT; | |
4770 | ||
4771 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
4772 | ||
4773 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
4774 | return -EINVAL; | |
4775 | ||
4776 | /* Values corresponding to the specific association. */ | |
4777 | if (asoc) { | |
4778 | rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial); | |
4779 | rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max); | |
4780 | rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min); | |
4781 | } else { | |
4782 | /* Values corresponding to the endpoint. */ | |
4783 | struct sctp_sock *sp = sctp_sk(sk); | |
4784 | ||
4785 | rtoinfo.srto_initial = sp->rtoinfo.srto_initial; | |
4786 | rtoinfo.srto_max = sp->rtoinfo.srto_max; | |
4787 | rtoinfo.srto_min = sp->rtoinfo.srto_min; | |
4788 | } | |
4789 | ||
4790 | if (put_user(len, optlen)) | |
4791 | return -EFAULT; | |
4792 | ||
4793 | if (copy_to_user(optval, &rtoinfo, len)) | |
4794 | return -EFAULT; | |
4795 | ||
4796 | return 0; | |
4797 | } | |
4798 | ||
4799 | /* | |
4800 | * | |
4801 | * 7.1.2 SCTP_ASSOCINFO | |
4802 | * | |
4803 | * This option is used to tune the maximum retransmission attempts | |
4804 | * of the association. | |
4805 | * Returns an error if the new association retransmission value is | |
4806 | * greater than the sum of the retransmission value of the peer. | |
4807 | * See [SCTP] for more information. | |
4808 | * | |
4809 | */ | |
4810 | static int sctp_getsockopt_associnfo(struct sock *sk, int len, | |
4811 | char __user *optval, | |
4812 | int __user *optlen) | |
4813 | { | |
4814 | ||
4815 | struct sctp_assocparams assocparams; | |
4816 | struct sctp_association *asoc; | |
4817 | struct list_head *pos; | |
4818 | int cnt = 0; | |
4819 | ||
4820 | if (len < sizeof (struct sctp_assocparams)) | |
4821 | return -EINVAL; | |
4822 | ||
4823 | len = sizeof(struct sctp_assocparams); | |
4824 | ||
4825 | if (copy_from_user(&assocparams, optval, len)) | |
4826 | return -EFAULT; | |
4827 | ||
4828 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
4829 | ||
4830 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
4831 | return -EINVAL; | |
4832 | ||
4833 | /* Values correspoinding to the specific association */ | |
4834 | if (asoc) { | |
4835 | assocparams.sasoc_asocmaxrxt = asoc->max_retrans; | |
4836 | assocparams.sasoc_peer_rwnd = asoc->peer.rwnd; | |
4837 | assocparams.sasoc_local_rwnd = asoc->a_rwnd; | |
4838 | assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec | |
4839 | * 1000) + | |
4840 | (asoc->cookie_life.tv_usec | |
4841 | / 1000); | |
4842 | ||
4843 | list_for_each(pos, &asoc->peer.transport_addr_list) { | |
4844 | cnt ++; | |
4845 | } | |
4846 | ||
4847 | assocparams.sasoc_number_peer_destinations = cnt; | |
4848 | } else { | |
4849 | /* Values corresponding to the endpoint */ | |
4850 | struct sctp_sock *sp = sctp_sk(sk); | |
4851 | ||
4852 | assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt; | |
4853 | assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd; | |
4854 | assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd; | |
4855 | assocparams.sasoc_cookie_life = | |
4856 | sp->assocparams.sasoc_cookie_life; | |
4857 | assocparams.sasoc_number_peer_destinations = | |
4858 | sp->assocparams. | |
4859 | sasoc_number_peer_destinations; | |
4860 | } | |
4861 | ||
4862 | if (put_user(len, optlen)) | |
4863 | return -EFAULT; | |
4864 | ||
4865 | if (copy_to_user(optval, &assocparams, len)) | |
4866 | return -EFAULT; | |
4867 | ||
4868 | return 0; | |
4869 | } | |
4870 | ||
4871 | /* | |
4872 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
4873 | * | |
4874 | * This socket option is a boolean flag which turns on or off mapped V4 | |
4875 | * addresses. If this option is turned on and the socket is type | |
4876 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
4877 | * If this option is turned off, then no mapping will be done of V4 | |
4878 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
4879 | * addresses on the socket. | |
4880 | */ | |
4881 | static int sctp_getsockopt_mappedv4(struct sock *sk, int len, | |
4882 | char __user *optval, int __user *optlen) | |
4883 | { | |
4884 | int val; | |
4885 | struct sctp_sock *sp = sctp_sk(sk); | |
4886 | ||
4887 | if (len < sizeof(int)) | |
4888 | return -EINVAL; | |
4889 | ||
4890 | len = sizeof(int); | |
4891 | val = sp->v4mapped; | |
4892 | if (put_user(len, optlen)) | |
4893 | return -EFAULT; | |
4894 | if (copy_to_user(optval, &val, len)) | |
4895 | return -EFAULT; | |
4896 | ||
4897 | return 0; | |
4898 | } | |
4899 | ||
4900 | /* | |
4901 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
4902 | * (chapter and verse is quoted at sctp_setsockopt_context()) | |
4903 | */ | |
4904 | static int sctp_getsockopt_context(struct sock *sk, int len, | |
4905 | char __user *optval, int __user *optlen) | |
4906 | { | |
4907 | struct sctp_assoc_value params; | |
4908 | struct sctp_sock *sp; | |
4909 | struct sctp_association *asoc; | |
4910 | ||
4911 | if (len < sizeof(struct sctp_assoc_value)) | |
4912 | return -EINVAL; | |
4913 | ||
4914 | len = sizeof(struct sctp_assoc_value); | |
4915 | ||
4916 | if (copy_from_user(¶ms, optval, len)) | |
4917 | return -EFAULT; | |
4918 | ||
4919 | sp = sctp_sk(sk); | |
4920 | ||
4921 | if (params.assoc_id != 0) { | |
4922 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
4923 | if (!asoc) | |
4924 | return -EINVAL; | |
4925 | params.assoc_value = asoc->default_rcv_context; | |
4926 | } else { | |
4927 | params.assoc_value = sp->default_rcv_context; | |
4928 | } | |
4929 | ||
4930 | if (put_user(len, optlen)) | |
4931 | return -EFAULT; | |
4932 | if (copy_to_user(optval, ¶ms, len)) | |
4933 | return -EFAULT; | |
4934 | ||
4935 | return 0; | |
4936 | } | |
4937 | ||
4938 | /* | |
4939 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) | |
4940 | * This option will get or set the maximum size to put in any outgoing | |
4941 | * SCTP DATA chunk. If a message is larger than this size it will be | |
4942 | * fragmented by SCTP into the specified size. Note that the underlying | |
4943 | * SCTP implementation may fragment into smaller sized chunks when the | |
4944 | * PMTU of the underlying association is smaller than the value set by | |
4945 | * the user. The default value for this option is '0' which indicates | |
4946 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
4947 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
4948 | * than the maximum size of an IP datagram will effectively let SCTP | |
4949 | * control fragmentation (i.e. the same as setting this option to 0). | |
4950 | * | |
4951 | * The following structure is used to access and modify this parameter: | |
4952 | * | |
4953 | * struct sctp_assoc_value { | |
4954 | * sctp_assoc_t assoc_id; | |
4955 | * uint32_t assoc_value; | |
4956 | * }; | |
4957 | * | |
4958 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
4959 | * For one-to-many style sockets this parameter indicates which | |
4960 | * association the user is performing an action upon. Note that if | |
4961 | * this field's value is zero then the endpoints default value is | |
4962 | * changed (effecting future associations only). | |
4963 | * assoc_value: This parameter specifies the maximum size in bytes. | |
4964 | */ | |
4965 | static int sctp_getsockopt_maxseg(struct sock *sk, int len, | |
4966 | char __user *optval, int __user *optlen) | |
4967 | { | |
4968 | struct sctp_assoc_value params; | |
4969 | struct sctp_association *asoc; | |
4970 | ||
4971 | if (len == sizeof(int)) { | |
4972 | pr_warn("Use of int in maxseg socket option deprecated\n"); | |
4973 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
4974 | params.assoc_id = 0; | |
4975 | } else if (len >= sizeof(struct sctp_assoc_value)) { | |
4976 | len = sizeof(struct sctp_assoc_value); | |
4977 | if (copy_from_user(¶ms, optval, sizeof(params))) | |
4978 | return -EFAULT; | |
4979 | } else | |
4980 | return -EINVAL; | |
4981 | ||
4982 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
4983 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
4984 | return -EINVAL; | |
4985 | ||
4986 | if (asoc) | |
4987 | params.assoc_value = asoc->frag_point; | |
4988 | else | |
4989 | params.assoc_value = sctp_sk(sk)->user_frag; | |
4990 | ||
4991 | if (put_user(len, optlen)) | |
4992 | return -EFAULT; | |
4993 | if (len == sizeof(int)) { | |
4994 | if (copy_to_user(optval, ¶ms.assoc_value, len)) | |
4995 | return -EFAULT; | |
4996 | } else { | |
4997 | if (copy_to_user(optval, ¶ms, len)) | |
4998 | return -EFAULT; | |
4999 | } | |
5000 | ||
5001 | return 0; | |
5002 | } | |
5003 | ||
5004 | /* | |
5005 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
5006 | * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave()) | |
5007 | */ | |
5008 | static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len, | |
5009 | char __user *optval, int __user *optlen) | |
5010 | { | |
5011 | int val; | |
5012 | ||
5013 | if (len < sizeof(int)) | |
5014 | return -EINVAL; | |
5015 | ||
5016 | len = sizeof(int); | |
5017 | ||
5018 | val = sctp_sk(sk)->frag_interleave; | |
5019 | if (put_user(len, optlen)) | |
5020 | return -EFAULT; | |
5021 | if (copy_to_user(optval, &val, len)) | |
5022 | return -EFAULT; | |
5023 | ||
5024 | return 0; | |
5025 | } | |
5026 | ||
5027 | /* | |
5028 | * 7.1.25. Set or Get the sctp partial delivery point | |
5029 | * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point()) | |
5030 | */ | |
5031 | static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len, | |
5032 | char __user *optval, | |
5033 | int __user *optlen) | |
5034 | { | |
5035 | u32 val; | |
5036 | ||
5037 | if (len < sizeof(u32)) | |
5038 | return -EINVAL; | |
5039 | ||
5040 | len = sizeof(u32); | |
5041 | ||
5042 | val = sctp_sk(sk)->pd_point; | |
5043 | if (put_user(len, optlen)) | |
5044 | return -EFAULT; | |
5045 | if (copy_to_user(optval, &val, len)) | |
5046 | return -EFAULT; | |
5047 | ||
5048 | return -ENOTSUPP; | |
5049 | } | |
5050 | ||
5051 | /* | |
5052 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
5053 | * (chapter and verse is quoted at sctp_setsockopt_maxburst()) | |
5054 | */ | |
5055 | static int sctp_getsockopt_maxburst(struct sock *sk, int len, | |
5056 | char __user *optval, | |
5057 | int __user *optlen) | |
5058 | { | |
5059 | struct sctp_assoc_value params; | |
5060 | struct sctp_sock *sp; | |
5061 | struct sctp_association *asoc; | |
5062 | ||
5063 | if (len == sizeof(int)) { | |
5064 | pr_warn("Use of int in max_burst socket option deprecated\n"); | |
5065 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
5066 | params.assoc_id = 0; | |
5067 | } else if (len >= sizeof(struct sctp_assoc_value)) { | |
5068 | len = sizeof(struct sctp_assoc_value); | |
5069 | if (copy_from_user(¶ms, optval, len)) | |
5070 | return -EFAULT; | |
5071 | } else | |
5072 | return -EINVAL; | |
5073 | ||
5074 | sp = sctp_sk(sk); | |
5075 | ||
5076 | if (params.assoc_id != 0) { | |
5077 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
5078 | if (!asoc) | |
5079 | return -EINVAL; | |
5080 | params.assoc_value = asoc->max_burst; | |
5081 | } else | |
5082 | params.assoc_value = sp->max_burst; | |
5083 | ||
5084 | if (len == sizeof(int)) { | |
5085 | if (copy_to_user(optval, ¶ms.assoc_value, len)) | |
5086 | return -EFAULT; | |
5087 | } else { | |
5088 | if (copy_to_user(optval, ¶ms, len)) | |
5089 | return -EFAULT; | |
5090 | } | |
5091 | ||
5092 | return 0; | |
5093 | ||
5094 | } | |
5095 | ||
5096 | static int sctp_getsockopt_hmac_ident(struct sock *sk, int len, | |
5097 | char __user *optval, int __user *optlen) | |
5098 | { | |
5099 | struct sctp_hmacalgo __user *p = (void __user *)optval; | |
5100 | struct sctp_hmac_algo_param *hmacs; | |
5101 | __u16 data_len = 0; | |
5102 | u32 num_idents; | |
5103 | ||
5104 | if (!sctp_auth_enable) | |
5105 | return -EACCES; | |
5106 | ||
5107 | hmacs = sctp_sk(sk)->ep->auth_hmacs_list; | |
5108 | data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t); | |
5109 | ||
5110 | if (len < sizeof(struct sctp_hmacalgo) + data_len) | |
5111 | return -EINVAL; | |
5112 | ||
5113 | len = sizeof(struct sctp_hmacalgo) + data_len; | |
5114 | num_idents = data_len / sizeof(u16); | |
5115 | ||
5116 | if (put_user(len, optlen)) | |
5117 | return -EFAULT; | |
5118 | if (put_user(num_idents, &p->shmac_num_idents)) | |
5119 | return -EFAULT; | |
5120 | if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len)) | |
5121 | return -EFAULT; | |
5122 | return 0; | |
5123 | } | |
5124 | ||
5125 | static int sctp_getsockopt_active_key(struct sock *sk, int len, | |
5126 | char __user *optval, int __user *optlen) | |
5127 | { | |
5128 | struct sctp_authkeyid val; | |
5129 | struct sctp_association *asoc; | |
5130 | ||
5131 | if (!sctp_auth_enable) | |
5132 | return -EACCES; | |
5133 | ||
5134 | if (len < sizeof(struct sctp_authkeyid)) | |
5135 | return -EINVAL; | |
5136 | if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid))) | |
5137 | return -EFAULT; | |
5138 | ||
5139 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
5140 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
5141 | return -EINVAL; | |
5142 | ||
5143 | if (asoc) | |
5144 | val.scact_keynumber = asoc->active_key_id; | |
5145 | else | |
5146 | val.scact_keynumber = sctp_sk(sk)->ep->active_key_id; | |
5147 | ||
5148 | len = sizeof(struct sctp_authkeyid); | |
5149 | if (put_user(len, optlen)) | |
5150 | return -EFAULT; | |
5151 | if (copy_to_user(optval, &val, len)) | |
5152 | return -EFAULT; | |
5153 | ||
5154 | return 0; | |
5155 | } | |
5156 | ||
5157 | static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len, | |
5158 | char __user *optval, int __user *optlen) | |
5159 | { | |
5160 | struct sctp_authchunks __user *p = (void __user *)optval; | |
5161 | struct sctp_authchunks val; | |
5162 | struct sctp_association *asoc; | |
5163 | struct sctp_chunks_param *ch; | |
5164 | u32 num_chunks = 0; | |
5165 | char __user *to; | |
5166 | ||
5167 | if (!sctp_auth_enable) | |
5168 | return -EACCES; | |
5169 | ||
5170 | if (len < sizeof(struct sctp_authchunks)) | |
5171 | return -EINVAL; | |
5172 | ||
5173 | if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks))) | |
5174 | return -EFAULT; | |
5175 | ||
5176 | to = p->gauth_chunks; | |
5177 | asoc = sctp_id2assoc(sk, val.gauth_assoc_id); | |
5178 | if (!asoc) | |
5179 | return -EINVAL; | |
5180 | ||
5181 | ch = asoc->peer.peer_chunks; | |
5182 | if (!ch) | |
5183 | goto num; | |
5184 | ||
5185 | /* See if the user provided enough room for all the data */ | |
5186 | num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); | |
5187 | if (len < num_chunks) | |
5188 | return -EINVAL; | |
5189 | ||
5190 | if (copy_to_user(to, ch->chunks, num_chunks)) | |
5191 | return -EFAULT; | |
5192 | num: | |
5193 | len = sizeof(struct sctp_authchunks) + num_chunks; | |
5194 | if (put_user(len, optlen)) return -EFAULT; | |
5195 | if (put_user(num_chunks, &p->gauth_number_of_chunks)) | |
5196 | return -EFAULT; | |
5197 | return 0; | |
5198 | } | |
5199 | ||
5200 | static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len, | |
5201 | char __user *optval, int __user *optlen) | |
5202 | { | |
5203 | struct sctp_authchunks __user *p = (void __user *)optval; | |
5204 | struct sctp_authchunks val; | |
5205 | struct sctp_association *asoc; | |
5206 | struct sctp_chunks_param *ch; | |
5207 | u32 num_chunks = 0; | |
5208 | char __user *to; | |
5209 | ||
5210 | if (!sctp_auth_enable) | |
5211 | return -EACCES; | |
5212 | ||
5213 | if (len < sizeof(struct sctp_authchunks)) | |
5214 | return -EINVAL; | |
5215 | ||
5216 | if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks))) | |
5217 | return -EFAULT; | |
5218 | ||
5219 | to = p->gauth_chunks; | |
5220 | asoc = sctp_id2assoc(sk, val.gauth_assoc_id); | |
5221 | if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP)) | |
5222 | return -EINVAL; | |
5223 | ||
5224 | if (asoc) | |
5225 | ch = (struct sctp_chunks_param*)asoc->c.auth_chunks; | |
5226 | else | |
5227 | ch = sctp_sk(sk)->ep->auth_chunk_list; | |
5228 | ||
5229 | if (!ch) | |
5230 | goto num; | |
5231 | ||
5232 | num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); | |
5233 | if (len < sizeof(struct sctp_authchunks) + num_chunks) | |
5234 | return -EINVAL; | |
5235 | ||
5236 | if (copy_to_user(to, ch->chunks, num_chunks)) | |
5237 | return -EFAULT; | |
5238 | num: | |
5239 | len = sizeof(struct sctp_authchunks) + num_chunks; | |
5240 | if (put_user(len, optlen)) | |
5241 | return -EFAULT; | |
5242 | if (put_user(num_chunks, &p->gauth_number_of_chunks)) | |
5243 | return -EFAULT; | |
5244 | ||
5245 | return 0; | |
5246 | } | |
5247 | ||
5248 | /* | |
5249 | * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER) | |
5250 | * This option gets the current number of associations that are attached | |
5251 | * to a one-to-many style socket. The option value is an uint32_t. | |
5252 | */ | |
5253 | static int sctp_getsockopt_assoc_number(struct sock *sk, int len, | |
5254 | char __user *optval, int __user *optlen) | |
5255 | { | |
5256 | struct sctp_sock *sp = sctp_sk(sk); | |
5257 | struct sctp_association *asoc; | |
5258 | u32 val = 0; | |
5259 | ||
5260 | if (sctp_style(sk, TCP)) | |
5261 | return -EOPNOTSUPP; | |
5262 | ||
5263 | if (len < sizeof(u32)) | |
5264 | return -EINVAL; | |
5265 | ||
5266 | len = sizeof(u32); | |
5267 | ||
5268 | list_for_each_entry(asoc, &(sp->ep->asocs), asocs) { | |
5269 | val++; | |
5270 | } | |
5271 | ||
5272 | if (put_user(len, optlen)) | |
5273 | return -EFAULT; | |
5274 | if (copy_to_user(optval, &val, len)) | |
5275 | return -EFAULT; | |
5276 | ||
5277 | return 0; | |
5278 | } | |
5279 | ||
5280 | SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname, | |
5281 | char __user *optval, int __user *optlen) | |
5282 | { | |
5283 | int retval = 0; | |
5284 | int len; | |
5285 | ||
5286 | SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n", | |
5287 | sk, optname); | |
5288 | ||
5289 | /* I can hardly begin to describe how wrong this is. This is | |
5290 | * so broken as to be worse than useless. The API draft | |
5291 | * REALLY is NOT helpful here... I am not convinced that the | |
5292 | * semantics of getsockopt() with a level OTHER THAN SOL_SCTP | |
5293 | * are at all well-founded. | |
5294 | */ | |
5295 | if (level != SOL_SCTP) { | |
5296 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
5297 | ||
5298 | retval = af->getsockopt(sk, level, optname, optval, optlen); | |
5299 | return retval; | |
5300 | } | |
5301 | ||
5302 | if (get_user(len, optlen)) | |
5303 | return -EFAULT; | |
5304 | ||
5305 | sctp_lock_sock(sk); | |
5306 | ||
5307 | switch (optname) { | |
5308 | case SCTP_STATUS: | |
5309 | retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen); | |
5310 | break; | |
5311 | case SCTP_DISABLE_FRAGMENTS: | |
5312 | retval = sctp_getsockopt_disable_fragments(sk, len, optval, | |
5313 | optlen); | |
5314 | break; | |
5315 | case SCTP_EVENTS: | |
5316 | retval = sctp_getsockopt_events(sk, len, optval, optlen); | |
5317 | break; | |
5318 | case SCTP_AUTOCLOSE: | |
5319 | retval = sctp_getsockopt_autoclose(sk, len, optval, optlen); | |
5320 | break; | |
5321 | case SCTP_SOCKOPT_PEELOFF: | |
5322 | retval = sctp_getsockopt_peeloff(sk, len, optval, optlen); | |
5323 | break; | |
5324 | case SCTP_PEER_ADDR_PARAMS: | |
5325 | retval = sctp_getsockopt_peer_addr_params(sk, len, optval, | |
5326 | optlen); | |
5327 | break; | |
5328 | case SCTP_DELAYED_ACK: | |
5329 | retval = sctp_getsockopt_delayed_ack(sk, len, optval, | |
5330 | optlen); | |
5331 | break; | |
5332 | case SCTP_INITMSG: | |
5333 | retval = sctp_getsockopt_initmsg(sk, len, optval, optlen); | |
5334 | break; | |
5335 | case SCTP_GET_PEER_ADDRS: | |
5336 | retval = sctp_getsockopt_peer_addrs(sk, len, optval, | |
5337 | optlen); | |
5338 | break; | |
5339 | case SCTP_GET_LOCAL_ADDRS: | |
5340 | retval = sctp_getsockopt_local_addrs(sk, len, optval, | |
5341 | optlen); | |
5342 | break; | |
5343 | case SCTP_SOCKOPT_CONNECTX3: | |
5344 | retval = sctp_getsockopt_connectx3(sk, len, optval, optlen); | |
5345 | break; | |
5346 | case SCTP_DEFAULT_SEND_PARAM: | |
5347 | retval = sctp_getsockopt_default_send_param(sk, len, | |
5348 | optval, optlen); | |
5349 | break; | |
5350 | case SCTP_PRIMARY_ADDR: | |
5351 | retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen); | |
5352 | break; | |
5353 | case SCTP_NODELAY: | |
5354 | retval = sctp_getsockopt_nodelay(sk, len, optval, optlen); | |
5355 | break; | |
5356 | case SCTP_RTOINFO: | |
5357 | retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen); | |
5358 | break; | |
5359 | case SCTP_ASSOCINFO: | |
5360 | retval = sctp_getsockopt_associnfo(sk, len, optval, optlen); | |
5361 | break; | |
5362 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
5363 | retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen); | |
5364 | break; | |
5365 | case SCTP_MAXSEG: | |
5366 | retval = sctp_getsockopt_maxseg(sk, len, optval, optlen); | |
5367 | break; | |
5368 | case SCTP_GET_PEER_ADDR_INFO: | |
5369 | retval = sctp_getsockopt_peer_addr_info(sk, len, optval, | |
5370 | optlen); | |
5371 | break; | |
5372 | case SCTP_ADAPTATION_LAYER: | |
5373 | retval = sctp_getsockopt_adaptation_layer(sk, len, optval, | |
5374 | optlen); | |
5375 | break; | |
5376 | case SCTP_CONTEXT: | |
5377 | retval = sctp_getsockopt_context(sk, len, optval, optlen); | |
5378 | break; | |
5379 | case SCTP_FRAGMENT_INTERLEAVE: | |
5380 | retval = sctp_getsockopt_fragment_interleave(sk, len, optval, | |
5381 | optlen); | |
5382 | break; | |
5383 | case SCTP_PARTIAL_DELIVERY_POINT: | |
5384 | retval = sctp_getsockopt_partial_delivery_point(sk, len, optval, | |
5385 | optlen); | |
5386 | break; | |
5387 | case SCTP_MAX_BURST: | |
5388 | retval = sctp_getsockopt_maxburst(sk, len, optval, optlen); | |
5389 | break; | |
5390 | case SCTP_AUTH_KEY: | |
5391 | case SCTP_AUTH_CHUNK: | |
5392 | case SCTP_AUTH_DELETE_KEY: | |
5393 | retval = -EOPNOTSUPP; | |
5394 | break; | |
5395 | case SCTP_HMAC_IDENT: | |
5396 | retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen); | |
5397 | break; | |
5398 | case SCTP_AUTH_ACTIVE_KEY: | |
5399 | retval = sctp_getsockopt_active_key(sk, len, optval, optlen); | |
5400 | break; | |
5401 | case SCTP_PEER_AUTH_CHUNKS: | |
5402 | retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval, | |
5403 | optlen); | |
5404 | break; | |
5405 | case SCTP_LOCAL_AUTH_CHUNKS: | |
5406 | retval = sctp_getsockopt_local_auth_chunks(sk, len, optval, | |
5407 | optlen); | |
5408 | break; | |
5409 | case SCTP_GET_ASSOC_NUMBER: | |
5410 | retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen); | |
5411 | break; | |
5412 | default: | |
5413 | retval = -ENOPROTOOPT; | |
5414 | break; | |
5415 | } | |
5416 | ||
5417 | sctp_release_sock(sk); | |
5418 | return retval; | |
5419 | } | |
5420 | ||
5421 | static void sctp_hash(struct sock *sk) | |
5422 | { | |
5423 | /* STUB */ | |
5424 | } | |
5425 | ||
5426 | static void sctp_unhash(struct sock *sk) | |
5427 | { | |
5428 | /* STUB */ | |
5429 | } | |
5430 | ||
5431 | /* Check if port is acceptable. Possibly find first available port. | |
5432 | * | |
5433 | * The port hash table (contained in the 'global' SCTP protocol storage | |
5434 | * returned by struct sctp_protocol *sctp_get_protocol()). The hash | |
5435 | * table is an array of 4096 lists (sctp_bind_hashbucket). Each | |
5436 | * list (the list number is the port number hashed out, so as you | |
5437 | * would expect from a hash function, all the ports in a given list have | |
5438 | * such a number that hashes out to the same list number; you were | |
5439 | * expecting that, right?); so each list has a set of ports, with a | |
5440 | * link to the socket (struct sock) that uses it, the port number and | |
5441 | * a fastreuse flag (FIXME: NPI ipg). | |
5442 | */ | |
5443 | static struct sctp_bind_bucket *sctp_bucket_create( | |
5444 | struct sctp_bind_hashbucket *head, unsigned short snum); | |
5445 | ||
5446 | static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr) | |
5447 | { | |
5448 | struct sctp_bind_hashbucket *head; /* hash list */ | |
5449 | struct sctp_bind_bucket *pp; /* hash list port iterator */ | |
5450 | struct hlist_node *node; | |
5451 | unsigned short snum; | |
5452 | int ret; | |
5453 | ||
5454 | snum = ntohs(addr->v4.sin_port); | |
5455 | ||
5456 | SCTP_DEBUG_PRINTK("sctp_get_port() begins, snum=%d\n", snum); | |
5457 | sctp_local_bh_disable(); | |
5458 | ||
5459 | if (snum == 0) { | |
5460 | /* Search for an available port. */ | |
5461 | int low, high, remaining, index; | |
5462 | unsigned int rover; | |
5463 | ||
5464 | inet_get_local_port_range(&low, &high); | |
5465 | remaining = (high - low) + 1; | |
5466 | rover = net_random() % remaining + low; | |
5467 | ||
5468 | do { | |
5469 | rover++; | |
5470 | if ((rover < low) || (rover > high)) | |
5471 | rover = low; | |
5472 | if (inet_is_reserved_local_port(rover)) | |
5473 | continue; | |
5474 | index = sctp_phashfn(rover); | |
5475 | head = &sctp_port_hashtable[index]; | |
5476 | sctp_spin_lock(&head->lock); | |
5477 | sctp_for_each_hentry(pp, node, &head->chain) | |
5478 | if (pp->port == rover) | |
5479 | goto next; | |
5480 | break; | |
5481 | next: | |
5482 | sctp_spin_unlock(&head->lock); | |
5483 | } while (--remaining > 0); | |
5484 | ||
5485 | /* Exhausted local port range during search? */ | |
5486 | ret = 1; | |
5487 | if (remaining <= 0) | |
5488 | goto fail; | |
5489 | ||
5490 | /* OK, here is the one we will use. HEAD (the port | |
5491 | * hash table list entry) is non-NULL and we hold it's | |
5492 | * mutex. | |
5493 | */ | |
5494 | snum = rover; | |
5495 | } else { | |
5496 | /* We are given an specific port number; we verify | |
5497 | * that it is not being used. If it is used, we will | |
5498 | * exahust the search in the hash list corresponding | |
5499 | * to the port number (snum) - we detect that with the | |
5500 | * port iterator, pp being NULL. | |
5501 | */ | |
5502 | head = &sctp_port_hashtable[sctp_phashfn(snum)]; | |
5503 | sctp_spin_lock(&head->lock); | |
5504 | sctp_for_each_hentry(pp, node, &head->chain) { | |
5505 | if (pp->port == snum) | |
5506 | goto pp_found; | |
5507 | } | |
5508 | } | |
5509 | pp = NULL; | |
5510 | goto pp_not_found; | |
5511 | pp_found: | |
5512 | if (!hlist_empty(&pp->owner)) { | |
5513 | /* We had a port hash table hit - there is an | |
5514 | * available port (pp != NULL) and it is being | |
5515 | * used by other socket (pp->owner not empty); that other | |
5516 | * socket is going to be sk2. | |
5517 | */ | |
5518 | int reuse = sk->sk_reuse; | |
5519 | struct sock *sk2; | |
5520 | ||
5521 | SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n"); | |
5522 | if (pp->fastreuse && sk->sk_reuse && | |
5523 | sk->sk_state != SCTP_SS_LISTENING) | |
5524 | goto success; | |
5525 | ||
5526 | /* Run through the list of sockets bound to the port | |
5527 | * (pp->port) [via the pointers bind_next and | |
5528 | * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one, | |
5529 | * we get the endpoint they describe and run through | |
5530 | * the endpoint's list of IP (v4 or v6) addresses, | |
5531 | * comparing each of the addresses with the address of | |
5532 | * the socket sk. If we find a match, then that means | |
5533 | * that this port/socket (sk) combination are already | |
5534 | * in an endpoint. | |
5535 | */ | |
5536 | sk_for_each_bound(sk2, node, &pp->owner) { | |
5537 | struct sctp_endpoint *ep2; | |
5538 | ep2 = sctp_sk(sk2)->ep; | |
5539 | ||
5540 | if (sk == sk2 || | |
5541 | (reuse && sk2->sk_reuse && | |
5542 | sk2->sk_state != SCTP_SS_LISTENING)) | |
5543 | continue; | |
5544 | ||
5545 | if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr, | |
5546 | sctp_sk(sk2), sctp_sk(sk))) { | |
5547 | ret = (long)sk2; | |
5548 | goto fail_unlock; | |
5549 | } | |
5550 | } | |
5551 | SCTP_DEBUG_PRINTK("sctp_get_port(): Found a match\n"); | |
5552 | } | |
5553 | pp_not_found: | |
5554 | /* If there was a hash table miss, create a new port. */ | |
5555 | ret = 1; | |
5556 | if (!pp && !(pp = sctp_bucket_create(head, snum))) | |
5557 | goto fail_unlock; | |
5558 | ||
5559 | /* In either case (hit or miss), make sure fastreuse is 1 only | |
5560 | * if sk->sk_reuse is too (that is, if the caller requested | |
5561 | * SO_REUSEADDR on this socket -sk-). | |
5562 | */ | |
5563 | if (hlist_empty(&pp->owner)) { | |
5564 | if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING) | |
5565 | pp->fastreuse = 1; | |
5566 | else | |
5567 | pp->fastreuse = 0; | |
5568 | } else if (pp->fastreuse && | |
5569 | (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING)) | |
5570 | pp->fastreuse = 0; | |
5571 | ||
5572 | /* We are set, so fill up all the data in the hash table | |
5573 | * entry, tie the socket list information with the rest of the | |
5574 | * sockets FIXME: Blurry, NPI (ipg). | |
5575 | */ | |
5576 | success: | |
5577 | if (!sctp_sk(sk)->bind_hash) { | |
5578 | inet_sk(sk)->inet_num = snum; | |
5579 | sk_add_bind_node(sk, &pp->owner); | |
5580 | sctp_sk(sk)->bind_hash = pp; | |
5581 | } | |
5582 | ret = 0; | |
5583 | ||
5584 | fail_unlock: | |
5585 | sctp_spin_unlock(&head->lock); | |
5586 | ||
5587 | fail: | |
5588 | sctp_local_bh_enable(); | |
5589 | return ret; | |
5590 | } | |
5591 | ||
5592 | /* Assign a 'snum' port to the socket. If snum == 0, an ephemeral | |
5593 | * port is requested. | |
5594 | */ | |
5595 | static int sctp_get_port(struct sock *sk, unsigned short snum) | |
5596 | { | |
5597 | long ret; | |
5598 | union sctp_addr addr; | |
5599 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
5600 | ||
5601 | /* Set up a dummy address struct from the sk. */ | |
5602 | af->from_sk(&addr, sk); | |
5603 | addr.v4.sin_port = htons(snum); | |
5604 | ||
5605 | /* Note: sk->sk_num gets filled in if ephemeral port request. */ | |
5606 | ret = sctp_get_port_local(sk, &addr); | |
5607 | ||
5608 | return ret ? 1 : 0; | |
5609 | } | |
5610 | ||
5611 | /* | |
5612 | * Move a socket to LISTENING state. | |
5613 | */ | |
5614 | SCTP_STATIC int sctp_listen_start(struct sock *sk, int backlog) | |
5615 | { | |
5616 | struct sctp_sock *sp = sctp_sk(sk); | |
5617 | struct sctp_endpoint *ep = sp->ep; | |
5618 | struct crypto_hash *tfm = NULL; | |
5619 | ||
5620 | /* Allocate HMAC for generating cookie. */ | |
5621 | if (!sctp_sk(sk)->hmac && sctp_hmac_alg) { | |
5622 | tfm = crypto_alloc_hash(sctp_hmac_alg, 0, CRYPTO_ALG_ASYNC); | |
5623 | if (IS_ERR(tfm)) { | |
5624 | if (net_ratelimit()) { | |
5625 | pr_info("failed to load transform for %s: %ld\n", | |
5626 | sctp_hmac_alg, PTR_ERR(tfm)); | |
5627 | } | |
5628 | return -ENOSYS; | |
5629 | } | |
5630 | sctp_sk(sk)->hmac = tfm; | |
5631 | } | |
5632 | ||
5633 | /* | |
5634 | * If a bind() or sctp_bindx() is not called prior to a listen() | |
5635 | * call that allows new associations to be accepted, the system | |
5636 | * picks an ephemeral port and will choose an address set equivalent | |
5637 | * to binding with a wildcard address. | |
5638 | * | |
5639 | * This is not currently spelled out in the SCTP sockets | |
5640 | * extensions draft, but follows the practice as seen in TCP | |
5641 | * sockets. | |
5642 | * | |
5643 | */ | |
5644 | sk->sk_state = SCTP_SS_LISTENING; | |
5645 | if (!ep->base.bind_addr.port) { | |
5646 | if (sctp_autobind(sk)) | |
5647 | return -EAGAIN; | |
5648 | } else { | |
5649 | if (sctp_get_port(sk, inet_sk(sk)->inet_num)) { | |
5650 | sk->sk_state = SCTP_SS_CLOSED; | |
5651 | return -EADDRINUSE; | |
5652 | } | |
5653 | } | |
5654 | ||
5655 | sk->sk_max_ack_backlog = backlog; | |
5656 | sctp_hash_endpoint(ep); | |
5657 | return 0; | |
5658 | } | |
5659 | ||
5660 | /* | |
5661 | * 4.1.3 / 5.1.3 listen() | |
5662 | * | |
5663 | * By default, new associations are not accepted for UDP style sockets. | |
5664 | * An application uses listen() to mark a socket as being able to | |
5665 | * accept new associations. | |
5666 | * | |
5667 | * On TCP style sockets, applications use listen() to ready the SCTP | |
5668 | * endpoint for accepting inbound associations. | |
5669 | * | |
5670 | * On both types of endpoints a backlog of '0' disables listening. | |
5671 | * | |
5672 | * Move a socket to LISTENING state. | |
5673 | */ | |
5674 | int sctp_inet_listen(struct socket *sock, int backlog) | |
5675 | { | |
5676 | struct sock *sk = sock->sk; | |
5677 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; | |
5678 | int err = -EINVAL; | |
5679 | ||
5680 | if (unlikely(backlog < 0)) | |
5681 | return err; | |
5682 | ||
5683 | sctp_lock_sock(sk); | |
5684 | ||
5685 | /* Peeled-off sockets are not allowed to listen(). */ | |
5686 | if (sctp_style(sk, UDP_HIGH_BANDWIDTH)) | |
5687 | goto out; | |
5688 | ||
5689 | if (sock->state != SS_UNCONNECTED) | |
5690 | goto out; | |
5691 | ||
5692 | /* If backlog is zero, disable listening. */ | |
5693 | if (!backlog) { | |
5694 | if (sctp_sstate(sk, CLOSED)) | |
5695 | goto out; | |
5696 | ||
5697 | err = 0; | |
5698 | sctp_unhash_endpoint(ep); | |
5699 | sk->sk_state = SCTP_SS_CLOSED; | |
5700 | if (sk->sk_reuse) | |
5701 | sctp_sk(sk)->bind_hash->fastreuse = 1; | |
5702 | goto out; | |
5703 | } | |
5704 | ||
5705 | /* If we are already listening, just update the backlog */ | |
5706 | if (sctp_sstate(sk, LISTENING)) | |
5707 | sk->sk_max_ack_backlog = backlog; | |
5708 | else { | |
5709 | err = sctp_listen_start(sk, backlog); | |
5710 | if (err) | |
5711 | goto out; | |
5712 | } | |
5713 | ||
5714 | err = 0; | |
5715 | out: | |
5716 | sctp_release_sock(sk); | |
5717 | return err; | |
5718 | } | |
5719 | ||
5720 | /* | |
5721 | * This function is done by modeling the current datagram_poll() and the | |
5722 | * tcp_poll(). Note that, based on these implementations, we don't | |
5723 | * lock the socket in this function, even though it seems that, | |
5724 | * ideally, locking or some other mechanisms can be used to ensure | |
5725 | * the integrity of the counters (sndbuf and wmem_alloc) used | |
5726 | * in this place. We assume that we don't need locks either until proven | |
5727 | * otherwise. | |
5728 | * | |
5729 | * Another thing to note is that we include the Async I/O support | |
5730 | * here, again, by modeling the current TCP/UDP code. We don't have | |
5731 | * a good way to test with it yet. | |
5732 | */ | |
5733 | unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
5734 | { | |
5735 | struct sock *sk = sock->sk; | |
5736 | struct sctp_sock *sp = sctp_sk(sk); | |
5737 | unsigned int mask; | |
5738 | ||
5739 | poll_wait(file, sk_sleep(sk), wait); | |
5740 | ||
5741 | /* A TCP-style listening socket becomes readable when the accept queue | |
5742 | * is not empty. | |
5743 | */ | |
5744 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
5745 | return (!list_empty(&sp->ep->asocs)) ? | |
5746 | (POLLIN | POLLRDNORM) : 0; | |
5747 | ||
5748 | mask = 0; | |
5749 | ||
5750 | /* Is there any exceptional events? */ | |
5751 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
5752 | mask |= POLLERR; | |
5753 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
5754 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
5755 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
5756 | mask |= POLLHUP; | |
5757 | ||
5758 | /* Is it readable? Reconsider this code with TCP-style support. */ | |
5759 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
5760 | mask |= POLLIN | POLLRDNORM; | |
5761 | ||
5762 | /* The association is either gone or not ready. */ | |
5763 | if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED)) | |
5764 | return mask; | |
5765 | ||
5766 | /* Is it writable? */ | |
5767 | if (sctp_writeable(sk)) { | |
5768 | mask |= POLLOUT | POLLWRNORM; | |
5769 | } else { | |
5770 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
5771 | /* | |
5772 | * Since the socket is not locked, the buffer | |
5773 | * might be made available after the writeable check and | |
5774 | * before the bit is set. This could cause a lost I/O | |
5775 | * signal. tcp_poll() has a race breaker for this race | |
5776 | * condition. Based on their implementation, we put | |
5777 | * in the following code to cover it as well. | |
5778 | */ | |
5779 | if (sctp_writeable(sk)) | |
5780 | mask |= POLLOUT | POLLWRNORM; | |
5781 | } | |
5782 | return mask; | |
5783 | } | |
5784 | ||
5785 | /******************************************************************** | |
5786 | * 2nd Level Abstractions | |
5787 | ********************************************************************/ | |
5788 | ||
5789 | static struct sctp_bind_bucket *sctp_bucket_create( | |
5790 | struct sctp_bind_hashbucket *head, unsigned short snum) | |
5791 | { | |
5792 | struct sctp_bind_bucket *pp; | |
5793 | ||
5794 | pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC); | |
5795 | if (pp) { | |
5796 | SCTP_DBG_OBJCNT_INC(bind_bucket); | |
5797 | pp->port = snum; | |
5798 | pp->fastreuse = 0; | |
5799 | INIT_HLIST_HEAD(&pp->owner); | |
5800 | hlist_add_head(&pp->node, &head->chain); | |
5801 | } | |
5802 | return pp; | |
5803 | } | |
5804 | ||
5805 | /* Caller must hold hashbucket lock for this tb with local BH disabled */ | |
5806 | static void sctp_bucket_destroy(struct sctp_bind_bucket *pp) | |
5807 | { | |
5808 | if (pp && hlist_empty(&pp->owner)) { | |
5809 | __hlist_del(&pp->node); | |
5810 | kmem_cache_free(sctp_bucket_cachep, pp); | |
5811 | SCTP_DBG_OBJCNT_DEC(bind_bucket); | |
5812 | } | |
5813 | } | |
5814 | ||
5815 | /* Release this socket's reference to a local port. */ | |
5816 | static inline void __sctp_put_port(struct sock *sk) | |
5817 | { | |
5818 | struct sctp_bind_hashbucket *head = | |
5819 | &sctp_port_hashtable[sctp_phashfn(inet_sk(sk)->inet_num)]; | |
5820 | struct sctp_bind_bucket *pp; | |
5821 | ||
5822 | sctp_spin_lock(&head->lock); | |
5823 | pp = sctp_sk(sk)->bind_hash; | |
5824 | __sk_del_bind_node(sk); | |
5825 | sctp_sk(sk)->bind_hash = NULL; | |
5826 | inet_sk(sk)->inet_num = 0; | |
5827 | sctp_bucket_destroy(pp); | |
5828 | sctp_spin_unlock(&head->lock); | |
5829 | } | |
5830 | ||
5831 | void sctp_put_port(struct sock *sk) | |
5832 | { | |
5833 | sctp_local_bh_disable(); | |
5834 | __sctp_put_port(sk); | |
5835 | sctp_local_bh_enable(); | |
5836 | } | |
5837 | ||
5838 | /* | |
5839 | * The system picks an ephemeral port and choose an address set equivalent | |
5840 | * to binding with a wildcard address. | |
5841 | * One of those addresses will be the primary address for the association. | |
5842 | * This automatically enables the multihoming capability of SCTP. | |
5843 | */ | |
5844 | static int sctp_autobind(struct sock *sk) | |
5845 | { | |
5846 | union sctp_addr autoaddr; | |
5847 | struct sctp_af *af; | |
5848 | __be16 port; | |
5849 | ||
5850 | /* Initialize a local sockaddr structure to INADDR_ANY. */ | |
5851 | af = sctp_sk(sk)->pf->af; | |
5852 | ||
5853 | port = htons(inet_sk(sk)->inet_num); | |
5854 | af->inaddr_any(&autoaddr, port); | |
5855 | ||
5856 | return sctp_do_bind(sk, &autoaddr, af->sockaddr_len); | |
5857 | } | |
5858 | ||
5859 | /* Parse out IPPROTO_SCTP CMSG headers. Perform only minimal validation. | |
5860 | * | |
5861 | * From RFC 2292 | |
5862 | * 4.2 The cmsghdr Structure * | |
5863 | * | |
5864 | * When ancillary data is sent or received, any number of ancillary data | |
5865 | * objects can be specified by the msg_control and msg_controllen members of | |
5866 | * the msghdr structure, because each object is preceded by | |
5867 | * a cmsghdr structure defining the object's length (the cmsg_len member). | |
5868 | * Historically Berkeley-derived implementations have passed only one object | |
5869 | * at a time, but this API allows multiple objects to be | |
5870 | * passed in a single call to sendmsg() or recvmsg(). The following example | |
5871 | * shows two ancillary data objects in a control buffer. | |
5872 | * | |
5873 | * |<--------------------------- msg_controllen -------------------------->| | |
5874 | * | | | |
5875 | * | |
5876 | * |<----- ancillary data object ----->|<----- ancillary data object ----->| | |
5877 | * | |
5878 | * |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->| | |
5879 | * | | | | |
5880 | * | |
5881 | * |<---------- cmsg_len ---------->| |<--------- cmsg_len ----------->| | | |
5882 | * | |
5883 | * |<--------- CMSG_LEN() --------->| |<-------- CMSG_LEN() ---------->| | | |
5884 | * | | | | | | |
5885 | * | |
5886 | * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+ | |
5887 | * |cmsg_|cmsg_|cmsg_|XX| |XX|cmsg_|cmsg_|cmsg_|XX| |XX| | |
5888 | * | |
5889 | * |len |level|type |XX|cmsg_data[]|XX|len |level|type |XX|cmsg_data[]|XX| | |
5890 | * | |
5891 | * +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+ | |
5892 | * ^ | |
5893 | * | | |
5894 | * | |
5895 | * msg_control | |
5896 | * points here | |
5897 | */ | |
5898 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg, | |
5899 | sctp_cmsgs_t *cmsgs) | |
5900 | { | |
5901 | struct cmsghdr *cmsg; | |
5902 | struct msghdr *my_msg = (struct msghdr *)msg; | |
5903 | ||
5904 | for (cmsg = CMSG_FIRSTHDR(msg); | |
5905 | cmsg != NULL; | |
5906 | cmsg = CMSG_NXTHDR(my_msg, cmsg)) { | |
5907 | if (!CMSG_OK(my_msg, cmsg)) | |
5908 | return -EINVAL; | |
5909 | ||
5910 | /* Should we parse this header or ignore? */ | |
5911 | if (cmsg->cmsg_level != IPPROTO_SCTP) | |
5912 | continue; | |
5913 | ||
5914 | /* Strictly check lengths following example in SCM code. */ | |
5915 | switch (cmsg->cmsg_type) { | |
5916 | case SCTP_INIT: | |
5917 | /* SCTP Socket API Extension | |
5918 | * 5.2.1 SCTP Initiation Structure (SCTP_INIT) | |
5919 | * | |
5920 | * This cmsghdr structure provides information for | |
5921 | * initializing new SCTP associations with sendmsg(). | |
5922 | * The SCTP_INITMSG socket option uses this same data | |
5923 | * structure. This structure is not used for | |
5924 | * recvmsg(). | |
5925 | * | |
5926 | * cmsg_level cmsg_type cmsg_data[] | |
5927 | * ------------ ------------ ---------------------- | |
5928 | * IPPROTO_SCTP SCTP_INIT struct sctp_initmsg | |
5929 | */ | |
5930 | if (cmsg->cmsg_len != | |
5931 | CMSG_LEN(sizeof(struct sctp_initmsg))) | |
5932 | return -EINVAL; | |
5933 | cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg); | |
5934 | break; | |
5935 | ||
5936 | case SCTP_SNDRCV: | |
5937 | /* SCTP Socket API Extension | |
5938 | * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV) | |
5939 | * | |
5940 | * This cmsghdr structure specifies SCTP options for | |
5941 | * sendmsg() and describes SCTP header information | |
5942 | * about a received message through recvmsg(). | |
5943 | * | |
5944 | * cmsg_level cmsg_type cmsg_data[] | |
5945 | * ------------ ------------ ---------------------- | |
5946 | * IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo | |
5947 | */ | |
5948 | if (cmsg->cmsg_len != | |
5949 | CMSG_LEN(sizeof(struct sctp_sndrcvinfo))) | |
5950 | return -EINVAL; | |
5951 | ||
5952 | cmsgs->info = | |
5953 | (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg); | |
5954 | ||
5955 | /* Minimally, validate the sinfo_flags. */ | |
5956 | if (cmsgs->info->sinfo_flags & | |
5957 | ~(SCTP_UNORDERED | SCTP_ADDR_OVER | | |
5958 | SCTP_ABORT | SCTP_EOF)) | |
5959 | return -EINVAL; | |
5960 | break; | |
5961 | ||
5962 | default: | |
5963 | return -EINVAL; | |
5964 | } | |
5965 | } | |
5966 | return 0; | |
5967 | } | |
5968 | ||
5969 | /* | |
5970 | * Wait for a packet.. | |
5971 | * Note: This function is the same function as in core/datagram.c | |
5972 | * with a few modifications to make lksctp work. | |
5973 | */ | |
5974 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p) | |
5975 | { | |
5976 | int error; | |
5977 | DEFINE_WAIT(wait); | |
5978 | ||
5979 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
5980 | ||
5981 | /* Socket errors? */ | |
5982 | error = sock_error(sk); | |
5983 | if (error) | |
5984 | goto out; | |
5985 | ||
5986 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
5987 | goto ready; | |
5988 | ||
5989 | /* Socket shut down? */ | |
5990 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
5991 | goto out; | |
5992 | ||
5993 | /* Sequenced packets can come disconnected. If so we report the | |
5994 | * problem. | |
5995 | */ | |
5996 | error = -ENOTCONN; | |
5997 | ||
5998 | /* Is there a good reason to think that we may receive some data? */ | |
5999 | if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING)) | |
6000 | goto out; | |
6001 | ||
6002 | /* Handle signals. */ | |
6003 | if (signal_pending(current)) | |
6004 | goto interrupted; | |
6005 | ||
6006 | /* Let another process have a go. Since we are going to sleep | |
6007 | * anyway. Note: This may cause odd behaviors if the message | |
6008 | * does not fit in the user's buffer, but this seems to be the | |
6009 | * only way to honor MSG_DONTWAIT realistically. | |
6010 | */ | |
6011 | sctp_release_sock(sk); | |
6012 | *timeo_p = schedule_timeout(*timeo_p); | |
6013 | sctp_lock_sock(sk); | |
6014 | ||
6015 | ready: | |
6016 | finish_wait(sk_sleep(sk), &wait); | |
6017 | return 0; | |
6018 | ||
6019 | interrupted: | |
6020 | error = sock_intr_errno(*timeo_p); | |
6021 | ||
6022 | out: | |
6023 | finish_wait(sk_sleep(sk), &wait); | |
6024 | *err = error; | |
6025 | return error; | |
6026 | } | |
6027 | ||
6028 | /* Receive a datagram. | |
6029 | * Note: This is pretty much the same routine as in core/datagram.c | |
6030 | * with a few changes to make lksctp work. | |
6031 | */ | |
6032 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags, | |
6033 | int noblock, int *err) | |
6034 | { | |
6035 | int error; | |
6036 | struct sk_buff *skb; | |
6037 | long timeo; | |
6038 | ||
6039 | timeo = sock_rcvtimeo(sk, noblock); | |
6040 | ||
6041 | SCTP_DEBUG_PRINTK("Timeout: timeo: %ld, MAX: %ld.\n", | |
6042 | timeo, MAX_SCHEDULE_TIMEOUT); | |
6043 | ||
6044 | do { | |
6045 | /* Again only user level code calls this function, | |
6046 | * so nothing interrupt level | |
6047 | * will suddenly eat the receive_queue. | |
6048 | * | |
6049 | * Look at current nfs client by the way... | |
6050 | * However, this function was corrent in any case. 8) | |
6051 | */ | |
6052 | if (flags & MSG_PEEK) { | |
6053 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
6054 | skb = skb_peek(&sk->sk_receive_queue); | |
6055 | if (skb) | |
6056 | atomic_inc(&skb->users); | |
6057 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
6058 | } else { | |
6059 | skb = skb_dequeue(&sk->sk_receive_queue); | |
6060 | } | |
6061 | ||
6062 | if (skb) | |
6063 | return skb; | |
6064 | ||
6065 | /* Caller is allowed not to check sk->sk_err before calling. */ | |
6066 | error = sock_error(sk); | |
6067 | if (error) | |
6068 | goto no_packet; | |
6069 | ||
6070 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
6071 | break; | |
6072 | ||
6073 | /* User doesn't want to wait. */ | |
6074 | error = -EAGAIN; | |
6075 | if (!timeo) | |
6076 | goto no_packet; | |
6077 | } while (sctp_wait_for_packet(sk, err, &timeo) == 0); | |
6078 | ||
6079 | return NULL; | |
6080 | ||
6081 | no_packet: | |
6082 | *err = error; | |
6083 | return NULL; | |
6084 | } | |
6085 | ||
6086 | /* If sndbuf has changed, wake up per association sndbuf waiters. */ | |
6087 | static void __sctp_write_space(struct sctp_association *asoc) | |
6088 | { | |
6089 | struct sock *sk = asoc->base.sk; | |
6090 | struct socket *sock = sk->sk_socket; | |
6091 | ||
6092 | if ((sctp_wspace(asoc) > 0) && sock) { | |
6093 | if (waitqueue_active(&asoc->wait)) | |
6094 | wake_up_interruptible(&asoc->wait); | |
6095 | ||
6096 | if (sctp_writeable(sk)) { | |
6097 | if (sk_sleep(sk) && waitqueue_active(sk_sleep(sk))) | |
6098 | wake_up_interruptible(sk_sleep(sk)); | |
6099 | ||
6100 | /* Note that we try to include the Async I/O support | |
6101 | * here by modeling from the current TCP/UDP code. | |
6102 | * We have not tested with it yet. | |
6103 | */ | |
6104 | if (sock->wq->fasync_list && | |
6105 | !(sk->sk_shutdown & SEND_SHUTDOWN)) | |
6106 | sock_wake_async(sock, | |
6107 | SOCK_WAKE_SPACE, POLL_OUT); | |
6108 | } | |
6109 | } | |
6110 | } | |
6111 | ||
6112 | /* Do accounting for the sndbuf space. | |
6113 | * Decrement the used sndbuf space of the corresponding association by the | |
6114 | * data size which was just transmitted(freed). | |
6115 | */ | |
6116 | static void sctp_wfree(struct sk_buff *skb) | |
6117 | { | |
6118 | struct sctp_association *asoc; | |
6119 | struct sctp_chunk *chunk; | |
6120 | struct sock *sk; | |
6121 | ||
6122 | /* Get the saved chunk pointer. */ | |
6123 | chunk = *((struct sctp_chunk **)(skb->cb)); | |
6124 | asoc = chunk->asoc; | |
6125 | sk = asoc->base.sk; | |
6126 | asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) + | |
6127 | sizeof(struct sk_buff) + | |
6128 | sizeof(struct sctp_chunk); | |
6129 | ||
6130 | atomic_sub(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); | |
6131 | ||
6132 | /* | |
6133 | * This undoes what is done via sctp_set_owner_w and sk_mem_charge | |
6134 | */ | |
6135 | sk->sk_wmem_queued -= skb->truesize; | |
6136 | sk_mem_uncharge(sk, skb->truesize); | |
6137 | ||
6138 | sock_wfree(skb); | |
6139 | __sctp_write_space(asoc); | |
6140 | ||
6141 | sctp_association_put(asoc); | |
6142 | } | |
6143 | ||
6144 | /* Do accounting for the receive space on the socket. | |
6145 | * Accounting for the association is done in ulpevent.c | |
6146 | * We set this as a destructor for the cloned data skbs so that | |
6147 | * accounting is done at the correct time. | |
6148 | */ | |
6149 | void sctp_sock_rfree(struct sk_buff *skb) | |
6150 | { | |
6151 | struct sock *sk = skb->sk; | |
6152 | struct sctp_ulpevent *event = sctp_skb2event(skb); | |
6153 | ||
6154 | atomic_sub(event->rmem_len, &sk->sk_rmem_alloc); | |
6155 | ||
6156 | /* | |
6157 | * Mimic the behavior of sock_rfree | |
6158 | */ | |
6159 | sk_mem_uncharge(sk, event->rmem_len); | |
6160 | } | |
6161 | ||
6162 | ||
6163 | /* Helper function to wait for space in the sndbuf. */ | |
6164 | static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p, | |
6165 | size_t msg_len) | |
6166 | { | |
6167 | struct sock *sk = asoc->base.sk; | |
6168 | int err = 0; | |
6169 | long current_timeo = *timeo_p; | |
6170 | DEFINE_WAIT(wait); | |
6171 | ||
6172 | SCTP_DEBUG_PRINTK("wait_for_sndbuf: asoc=%p, timeo=%ld, msg_len=%zu\n", | |
6173 | asoc, (long)(*timeo_p), msg_len); | |
6174 | ||
6175 | /* Increment the association's refcnt. */ | |
6176 | sctp_association_hold(asoc); | |
6177 | ||
6178 | /* Wait on the association specific sndbuf space. */ | |
6179 | for (;;) { | |
6180 | prepare_to_wait_exclusive(&asoc->wait, &wait, | |
6181 | TASK_INTERRUPTIBLE); | |
6182 | if (!*timeo_p) | |
6183 | goto do_nonblock; | |
6184 | if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING || | |
6185 | asoc->base.dead) | |
6186 | goto do_error; | |
6187 | if (signal_pending(current)) | |
6188 | goto do_interrupted; | |
6189 | if (msg_len <= sctp_wspace(asoc)) | |
6190 | break; | |
6191 | ||
6192 | /* Let another process have a go. Since we are going | |
6193 | * to sleep anyway. | |
6194 | */ | |
6195 | sctp_release_sock(sk); | |
6196 | current_timeo = schedule_timeout(current_timeo); | |
6197 | BUG_ON(sk != asoc->base.sk); | |
6198 | sctp_lock_sock(sk); | |
6199 | ||
6200 | *timeo_p = current_timeo; | |
6201 | } | |
6202 | ||
6203 | out: | |
6204 | finish_wait(&asoc->wait, &wait); | |
6205 | ||
6206 | /* Release the association's refcnt. */ | |
6207 | sctp_association_put(asoc); | |
6208 | ||
6209 | return err; | |
6210 | ||
6211 | do_error: | |
6212 | err = -EPIPE; | |
6213 | goto out; | |
6214 | ||
6215 | do_interrupted: | |
6216 | err = sock_intr_errno(*timeo_p); | |
6217 | goto out; | |
6218 | ||
6219 | do_nonblock: | |
6220 | err = -EAGAIN; | |
6221 | goto out; | |
6222 | } | |
6223 | ||
6224 | void sctp_data_ready(struct sock *sk, int len) | |
6225 | { | |
6226 | struct socket_wq *wq; | |
6227 | ||
6228 | rcu_read_lock(); | |
6229 | wq = rcu_dereference(sk->sk_wq); | |
6230 | if (wq_has_sleeper(wq)) | |
6231 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
6232 | POLLRDNORM | POLLRDBAND); | |
6233 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); | |
6234 | rcu_read_unlock(); | |
6235 | } | |
6236 | ||
6237 | /* If socket sndbuf has changed, wake up all per association waiters. */ | |
6238 | void sctp_write_space(struct sock *sk) | |
6239 | { | |
6240 | struct sctp_association *asoc; | |
6241 | ||
6242 | /* Wake up the tasks in each wait queue. */ | |
6243 | list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) { | |
6244 | __sctp_write_space(asoc); | |
6245 | } | |
6246 | } | |
6247 | ||
6248 | /* Is there any sndbuf space available on the socket? | |
6249 | * | |
6250 | * Note that sk_wmem_alloc is the sum of the send buffers on all of the | |
6251 | * associations on the same socket. For a UDP-style socket with | |
6252 | * multiple associations, it is possible for it to be "unwriteable" | |
6253 | * prematurely. I assume that this is acceptable because | |
6254 | * a premature "unwriteable" is better than an accidental "writeable" which | |
6255 | * would cause an unwanted block under certain circumstances. For the 1-1 | |
6256 | * UDP-style sockets or TCP-style sockets, this code should work. | |
6257 | * - Daisy | |
6258 | */ | |
6259 | static int sctp_writeable(struct sock *sk) | |
6260 | { | |
6261 | int amt = 0; | |
6262 | ||
6263 | amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
6264 | if (amt < 0) | |
6265 | amt = 0; | |
6266 | return amt; | |
6267 | } | |
6268 | ||
6269 | /* Wait for an association to go into ESTABLISHED state. If timeout is 0, | |
6270 | * returns immediately with EINPROGRESS. | |
6271 | */ | |
6272 | static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p) | |
6273 | { | |
6274 | struct sock *sk = asoc->base.sk; | |
6275 | int err = 0; | |
6276 | long current_timeo = *timeo_p; | |
6277 | DEFINE_WAIT(wait); | |
6278 | ||
6279 | SCTP_DEBUG_PRINTK("%s: asoc=%p, timeo=%ld\n", __func__, asoc, | |
6280 | (long)(*timeo_p)); | |
6281 | ||
6282 | /* Increment the association's refcnt. */ | |
6283 | sctp_association_hold(asoc); | |
6284 | ||
6285 | for (;;) { | |
6286 | prepare_to_wait_exclusive(&asoc->wait, &wait, | |
6287 | TASK_INTERRUPTIBLE); | |
6288 | if (!*timeo_p) | |
6289 | goto do_nonblock; | |
6290 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
6291 | break; | |
6292 | if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING || | |
6293 | asoc->base.dead) | |
6294 | goto do_error; | |
6295 | if (signal_pending(current)) | |
6296 | goto do_interrupted; | |
6297 | ||
6298 | if (sctp_state(asoc, ESTABLISHED)) | |
6299 | break; | |
6300 | ||
6301 | /* Let another process have a go. Since we are going | |
6302 | * to sleep anyway. | |
6303 | */ | |
6304 | sctp_release_sock(sk); | |
6305 | current_timeo = schedule_timeout(current_timeo); | |
6306 | sctp_lock_sock(sk); | |
6307 | ||
6308 | *timeo_p = current_timeo; | |
6309 | } | |
6310 | ||
6311 | out: | |
6312 | finish_wait(&asoc->wait, &wait); | |
6313 | ||
6314 | /* Release the association's refcnt. */ | |
6315 | sctp_association_put(asoc); | |
6316 | ||
6317 | return err; | |
6318 | ||
6319 | do_error: | |
6320 | if (asoc->init_err_counter + 1 > asoc->max_init_attempts) | |
6321 | err = -ETIMEDOUT; | |
6322 | else | |
6323 | err = -ECONNREFUSED; | |
6324 | goto out; | |
6325 | ||
6326 | do_interrupted: | |
6327 | err = sock_intr_errno(*timeo_p); | |
6328 | goto out; | |
6329 | ||
6330 | do_nonblock: | |
6331 | err = -EINPROGRESS; | |
6332 | goto out; | |
6333 | } | |
6334 | ||
6335 | static int sctp_wait_for_accept(struct sock *sk, long timeo) | |
6336 | { | |
6337 | struct sctp_endpoint *ep; | |
6338 | int err = 0; | |
6339 | DEFINE_WAIT(wait); | |
6340 | ||
6341 | ep = sctp_sk(sk)->ep; | |
6342 | ||
6343 | ||
6344 | for (;;) { | |
6345 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
6346 | TASK_INTERRUPTIBLE); | |
6347 | ||
6348 | if (list_empty(&ep->asocs)) { | |
6349 | sctp_release_sock(sk); | |
6350 | timeo = schedule_timeout(timeo); | |
6351 | sctp_lock_sock(sk); | |
6352 | } | |
6353 | ||
6354 | err = -EINVAL; | |
6355 | if (!sctp_sstate(sk, LISTENING)) | |
6356 | break; | |
6357 | ||
6358 | err = 0; | |
6359 | if (!list_empty(&ep->asocs)) | |
6360 | break; | |
6361 | ||
6362 | err = sock_intr_errno(timeo); | |
6363 | if (signal_pending(current)) | |
6364 | break; | |
6365 | ||
6366 | err = -EAGAIN; | |
6367 | if (!timeo) | |
6368 | break; | |
6369 | } | |
6370 | ||
6371 | finish_wait(sk_sleep(sk), &wait); | |
6372 | ||
6373 | return err; | |
6374 | } | |
6375 | ||
6376 | static void sctp_wait_for_close(struct sock *sk, long timeout) | |
6377 | { | |
6378 | DEFINE_WAIT(wait); | |
6379 | ||
6380 | do { | |
6381 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
6382 | if (list_empty(&sctp_sk(sk)->ep->asocs)) | |
6383 | break; | |
6384 | sctp_release_sock(sk); | |
6385 | timeout = schedule_timeout(timeout); | |
6386 | sctp_lock_sock(sk); | |
6387 | } while (!signal_pending(current) && timeout); | |
6388 | ||
6389 | finish_wait(sk_sleep(sk), &wait); | |
6390 | } | |
6391 | ||
6392 | static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk) | |
6393 | { | |
6394 | struct sk_buff *frag; | |
6395 | ||
6396 | if (!skb->data_len) | |
6397 | goto done; | |
6398 | ||
6399 | /* Don't forget the fragments. */ | |
6400 | skb_walk_frags(skb, frag) | |
6401 | sctp_skb_set_owner_r_frag(frag, sk); | |
6402 | ||
6403 | done: | |
6404 | sctp_skb_set_owner_r(skb, sk); | |
6405 | } | |
6406 | ||
6407 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, | |
6408 | struct sctp_association *asoc) | |
6409 | { | |
6410 | struct inet_sock *inet = inet_sk(sk); | |
6411 | struct inet_sock *newinet; | |
6412 | ||
6413 | newsk->sk_type = sk->sk_type; | |
6414 | newsk->sk_bound_dev_if = sk->sk_bound_dev_if; | |
6415 | newsk->sk_flags = sk->sk_flags; | |
6416 | newsk->sk_no_check = sk->sk_no_check; | |
6417 | newsk->sk_reuse = sk->sk_reuse; | |
6418 | ||
6419 | newsk->sk_shutdown = sk->sk_shutdown; | |
6420 | newsk->sk_destruct = inet_sock_destruct; | |
6421 | newsk->sk_family = sk->sk_family; | |
6422 | newsk->sk_protocol = IPPROTO_SCTP; | |
6423 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
6424 | newsk->sk_sndbuf = sk->sk_sndbuf; | |
6425 | newsk->sk_rcvbuf = sk->sk_rcvbuf; | |
6426 | newsk->sk_lingertime = sk->sk_lingertime; | |
6427 | newsk->sk_rcvtimeo = sk->sk_rcvtimeo; | |
6428 | newsk->sk_sndtimeo = sk->sk_sndtimeo; | |
6429 | ||
6430 | newinet = inet_sk(newsk); | |
6431 | ||
6432 | /* Initialize sk's sport, dport, rcv_saddr and daddr for | |
6433 | * getsockname() and getpeername() | |
6434 | */ | |
6435 | newinet->inet_sport = inet->inet_sport; | |
6436 | newinet->inet_saddr = inet->inet_saddr; | |
6437 | newinet->inet_rcv_saddr = inet->inet_rcv_saddr; | |
6438 | newinet->inet_dport = htons(asoc->peer.port); | |
6439 | newinet->pmtudisc = inet->pmtudisc; | |
6440 | newinet->inet_id = asoc->next_tsn ^ jiffies; | |
6441 | ||
6442 | newinet->uc_ttl = inet->uc_ttl; | |
6443 | newinet->mc_loop = 1; | |
6444 | newinet->mc_ttl = 1; | |
6445 | newinet->mc_index = 0; | |
6446 | newinet->mc_list = NULL; | |
6447 | } | |
6448 | ||
6449 | /* Populate the fields of the newsk from the oldsk and migrate the assoc | |
6450 | * and its messages to the newsk. | |
6451 | */ | |
6452 | static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk, | |
6453 | struct sctp_association *assoc, | |
6454 | sctp_socket_type_t type) | |
6455 | { | |
6456 | struct sctp_sock *oldsp = sctp_sk(oldsk); | |
6457 | struct sctp_sock *newsp = sctp_sk(newsk); | |
6458 | struct sctp_bind_bucket *pp; /* hash list port iterator */ | |
6459 | struct sctp_endpoint *newep = newsp->ep; | |
6460 | struct sk_buff *skb, *tmp; | |
6461 | struct sctp_ulpevent *event; | |
6462 | struct sctp_bind_hashbucket *head; | |
6463 | ||
6464 | /* Migrate socket buffer sizes and all the socket level options to the | |
6465 | * new socket. | |
6466 | */ | |
6467 | newsk->sk_sndbuf = oldsk->sk_sndbuf; | |
6468 | newsk->sk_rcvbuf = oldsk->sk_rcvbuf; | |
6469 | /* Brute force copy old sctp opt. */ | |
6470 | inet_sk_copy_descendant(newsk, oldsk); | |
6471 | ||
6472 | /* Restore the ep value that was overwritten with the above structure | |
6473 | * copy. | |
6474 | */ | |
6475 | newsp->ep = newep; | |
6476 | newsp->hmac = NULL; | |
6477 | ||
6478 | /* Hook this new socket in to the bind_hash list. */ | |
6479 | head = &sctp_port_hashtable[sctp_phashfn(inet_sk(oldsk)->inet_num)]; | |
6480 | sctp_local_bh_disable(); | |
6481 | sctp_spin_lock(&head->lock); | |
6482 | pp = sctp_sk(oldsk)->bind_hash; | |
6483 | sk_add_bind_node(newsk, &pp->owner); | |
6484 | sctp_sk(newsk)->bind_hash = pp; | |
6485 | inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num; | |
6486 | sctp_spin_unlock(&head->lock); | |
6487 | sctp_local_bh_enable(); | |
6488 | ||
6489 | /* Copy the bind_addr list from the original endpoint to the new | |
6490 | * endpoint so that we can handle restarts properly | |
6491 | */ | |
6492 | sctp_bind_addr_dup(&newsp->ep->base.bind_addr, | |
6493 | &oldsp->ep->base.bind_addr, GFP_KERNEL); | |
6494 | ||
6495 | /* Move any messages in the old socket's receive queue that are for the | |
6496 | * peeled off association to the new socket's receive queue. | |
6497 | */ | |
6498 | sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) { | |
6499 | event = sctp_skb2event(skb); | |
6500 | if (event->asoc == assoc) { | |
6501 | __skb_unlink(skb, &oldsk->sk_receive_queue); | |
6502 | __skb_queue_tail(&newsk->sk_receive_queue, skb); | |
6503 | sctp_skb_set_owner_r_frag(skb, newsk); | |
6504 | } | |
6505 | } | |
6506 | ||
6507 | /* Clean up any messages pending delivery due to partial | |
6508 | * delivery. Three cases: | |
6509 | * 1) No partial deliver; no work. | |
6510 | * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby. | |
6511 | * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue. | |
6512 | */ | |
6513 | skb_queue_head_init(&newsp->pd_lobby); | |
6514 | atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode); | |
6515 | ||
6516 | if (atomic_read(&sctp_sk(oldsk)->pd_mode)) { | |
6517 | struct sk_buff_head *queue; | |
6518 | ||
6519 | /* Decide which queue to move pd_lobby skbs to. */ | |
6520 | if (assoc->ulpq.pd_mode) { | |
6521 | queue = &newsp->pd_lobby; | |
6522 | } else | |
6523 | queue = &newsk->sk_receive_queue; | |
6524 | ||
6525 | /* Walk through the pd_lobby, looking for skbs that | |
6526 | * need moved to the new socket. | |
6527 | */ | |
6528 | sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) { | |
6529 | event = sctp_skb2event(skb); | |
6530 | if (event->asoc == assoc) { | |
6531 | __skb_unlink(skb, &oldsp->pd_lobby); | |
6532 | __skb_queue_tail(queue, skb); | |
6533 | sctp_skb_set_owner_r_frag(skb, newsk); | |
6534 | } | |
6535 | } | |
6536 | ||
6537 | /* Clear up any skbs waiting for the partial | |
6538 | * delivery to finish. | |
6539 | */ | |
6540 | if (assoc->ulpq.pd_mode) | |
6541 | sctp_clear_pd(oldsk, NULL); | |
6542 | ||
6543 | } | |
6544 | ||
6545 | sctp_skb_for_each(skb, &assoc->ulpq.reasm, tmp) | |
6546 | sctp_skb_set_owner_r_frag(skb, newsk); | |
6547 | ||
6548 | sctp_skb_for_each(skb, &assoc->ulpq.lobby, tmp) | |
6549 | sctp_skb_set_owner_r_frag(skb, newsk); | |
6550 | ||
6551 | /* Set the type of socket to indicate that it is peeled off from the | |
6552 | * original UDP-style socket or created with the accept() call on a | |
6553 | * TCP-style socket.. | |
6554 | */ | |
6555 | newsp->type = type; | |
6556 | ||
6557 | /* Mark the new socket "in-use" by the user so that any packets | |
6558 | * that may arrive on the association after we've moved it are | |
6559 | * queued to the backlog. This prevents a potential race between | |
6560 | * backlog processing on the old socket and new-packet processing | |
6561 | * on the new socket. | |
6562 | * | |
6563 | * The caller has just allocated newsk so we can guarantee that other | |
6564 | * paths won't try to lock it and then oldsk. | |
6565 | */ | |
6566 | lock_sock_nested(newsk, SINGLE_DEPTH_NESTING); | |
6567 | sctp_assoc_migrate(assoc, newsk); | |
6568 | ||
6569 | /* If the association on the newsk is already closed before accept() | |
6570 | * is called, set RCV_SHUTDOWN flag. | |
6571 | */ | |
6572 | if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) | |
6573 | newsk->sk_shutdown |= RCV_SHUTDOWN; | |
6574 | ||
6575 | newsk->sk_state = SCTP_SS_ESTABLISHED; | |
6576 | sctp_release_sock(newsk); | |
6577 | } | |
6578 | ||
6579 | ||
6580 | /* This proto struct describes the ULP interface for SCTP. */ | |
6581 | struct proto sctp_prot = { | |
6582 | .name = "SCTP", | |
6583 | .owner = THIS_MODULE, | |
6584 | .close = sctp_close, | |
6585 | .connect = sctp_connect, | |
6586 | .disconnect = sctp_disconnect, | |
6587 | .accept = sctp_accept, | |
6588 | .ioctl = sctp_ioctl, | |
6589 | .init = sctp_init_sock, | |
6590 | .destroy = sctp_destroy_sock, | |
6591 | .shutdown = sctp_shutdown, | |
6592 | .setsockopt = sctp_setsockopt, | |
6593 | .getsockopt = sctp_getsockopt, | |
6594 | .sendmsg = sctp_sendmsg, | |
6595 | .recvmsg = sctp_recvmsg, | |
6596 | .bind = sctp_bind, | |
6597 | .backlog_rcv = sctp_backlog_rcv, | |
6598 | .hash = sctp_hash, | |
6599 | .unhash = sctp_unhash, | |
6600 | .get_port = sctp_get_port, | |
6601 | .obj_size = sizeof(struct sctp_sock), | |
6602 | .sysctl_mem = sysctl_sctp_mem, | |
6603 | .sysctl_rmem = sysctl_sctp_rmem, | |
6604 | .sysctl_wmem = sysctl_sctp_wmem, | |
6605 | .memory_pressure = &sctp_memory_pressure, | |
6606 | .enter_memory_pressure = sctp_enter_memory_pressure, | |
6607 | .memory_allocated = &sctp_memory_allocated, | |
6608 | .sockets_allocated = &sctp_sockets_allocated, | |
6609 | }; | |
6610 | ||
6611 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
6612 | ||
6613 | struct proto sctpv6_prot = { | |
6614 | .name = "SCTPv6", | |
6615 | .owner = THIS_MODULE, | |
6616 | .close = sctp_close, | |
6617 | .connect = sctp_connect, | |
6618 | .disconnect = sctp_disconnect, | |
6619 | .accept = sctp_accept, | |
6620 | .ioctl = sctp_ioctl, | |
6621 | .init = sctp_init_sock, | |
6622 | .destroy = sctp_destroy_sock, | |
6623 | .shutdown = sctp_shutdown, | |
6624 | .setsockopt = sctp_setsockopt, | |
6625 | .getsockopt = sctp_getsockopt, | |
6626 | .sendmsg = sctp_sendmsg, | |
6627 | .recvmsg = sctp_recvmsg, | |
6628 | .bind = sctp_bind, | |
6629 | .backlog_rcv = sctp_backlog_rcv, | |
6630 | .hash = sctp_hash, | |
6631 | .unhash = sctp_unhash, | |
6632 | .get_port = sctp_get_port, | |
6633 | .obj_size = sizeof(struct sctp6_sock), | |
6634 | .sysctl_mem = sysctl_sctp_mem, | |
6635 | .sysctl_rmem = sysctl_sctp_rmem, | |
6636 | .sysctl_wmem = sysctl_sctp_wmem, | |
6637 | .memory_pressure = &sctp_memory_pressure, | |
6638 | .enter_memory_pressure = sctp_enter_memory_pressure, | |
6639 | .memory_allocated = &sctp_memory_allocated, | |
6640 | .sockets_allocated = &sctp_sockets_allocated, | |
6641 | }; | |
6642 | #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */ |