Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
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 | * | |
60c778b2 | 18 | * This SCTP implementation is free software; |
1da177e4 LT |
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 | * | |
60c778b2 | 24 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
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 | ||
145ce502 JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
1da177e4 LT |
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> | |
4fc268d2 | 67 | #include <linux/capability.h> |
1da177e4 LT |
68 | #include <linux/fcntl.h> |
69 | #include <linux/poll.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/crypto.h> | |
5a0e3ad6 | 72 | #include <linux/slab.h> |
1da177e4 LT |
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 | ||
4d93df0a | 113 | extern struct kmem_cache *sctp_bucket_cachep; |
8d987e5c | 114 | extern long sysctl_sctp_mem[3]; |
4d93df0a NH |
115 | extern int sysctl_sctp_rmem[3]; |
116 | extern int sysctl_sctp_wmem[3]; | |
117 | ||
b6fa1a4d | 118 | static int sctp_memory_pressure; |
8d987e5c | 119 | static atomic_long_t sctp_memory_allocated; |
1748376b | 120 | struct percpu_counter sctp_sockets_allocated; |
4d93df0a | 121 | |
5c52ba17 | 122 | static void sctp_enter_memory_pressure(struct sock *sk) |
4d93df0a NH |
123 | { |
124 | sctp_memory_pressure = 1; | |
125 | } | |
126 | ||
127 | ||
1da177e4 LT |
128 | /* Get the sndbuf space available at the time on the association. */ |
129 | static inline int sctp_wspace(struct sctp_association *asoc) | |
130 | { | |
4d93df0a | 131 | int amt; |
1da177e4 | 132 | |
4d93df0a NH |
133 | if (asoc->ep->sndbuf_policy) |
134 | amt = asoc->sndbuf_used; | |
135 | else | |
31e6d363 | 136 | amt = sk_wmem_alloc_get(asoc->base.sk); |
4d93df0a NH |
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 | } | |
4eb701df | 146 | } else { |
4d93df0a | 147 | amt = asoc->base.sk->sk_sndbuf - amt; |
4eb701df | 148 | } |
1da177e4 LT |
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 | ||
4eb701df NH |
169 | skb_set_owner_w(chunk->skb, sk); |
170 | ||
1da177e4 LT |
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 | ||
4eb701df NH |
175 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
176 | sizeof(struct sk_buff) + | |
177 | sizeof(struct sctp_chunk); | |
178 | ||
4eb701df | 179 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
3ab224be HA |
180 | sk->sk_wmem_queued += chunk->skb->truesize; |
181 | sk_mem_charge(sk, chunk->skb->truesize); | |
1da177e4 LT |
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? */ | |
5636bef7 | 196 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
1da177e4 LT |
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 | ||
1da177e4 | 254 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
cd4ff034 | 255 | laddr, |
1da177e4 | 256 | &transport); |
1da177e4 LT |
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 | */ | |
3f7a87d2 | 281 | SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
1da177e4 LT |
282 | { |
283 | int retval = 0; | |
284 | ||
285 | sctp_lock_sock(sk); | |
286 | ||
3f7a87d2 FF |
287 | SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n", |
288 | sk, addr, addr_len); | |
1da177e4 LT |
289 | |
290 | /* Disallow binding twice. */ | |
291 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
3f7a87d2 | 292 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
1da177e4 LT |
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 | ||
7dab83de VY |
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 | } | |
1da177e4 LT |
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 | ||
1da177e4 LT |
344 | /* Common sockaddr verification. */ |
345 | af = sctp_sockaddr_af(sp, addr, len); | |
3f7a87d2 FF |
346 | if (!af) { |
347 | SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n", | |
348 | sk, addr, len); | |
1da177e4 | 349 | return -EINVAL; |
3f7a87d2 FF |
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); | |
1da177e4 LT |
360 | |
361 | /* PF specific bind() address verification. */ | |
362 | if (!sp->pf->bind_verify(sp, addr)) | |
363 | return -EADDRNOTAVAIL; | |
364 | ||
8b358056 VY |
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:" | |
1da177e4 LT |
374 | " New port %d does not match existing port " |
375 | "%d.\n", snum, bp->port); | |
8b358056 VY |
376 | return -EINVAL; |
377 | } | |
1da177e4 LT |
378 | } |
379 | ||
380 | if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) | |
381 | return -EACCES; | |
382 | ||
4e54064e VY |
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 | ||
1da177e4 LT |
389 | /* Make sure we are allowed to bind here. |
390 | * The function sctp_get_port_local() does duplicate address | |
391 | * detection. | |
392 | */ | |
2772b495 | 393 | addr->v4.sin_port = htons(snum); |
1da177e4 | 394 | if ((ret = sctp_get_port_local(sk, addr))) { |
4e54064e | 395 | return -EADDRINUSE; |
1da177e4 LT |
396 | } |
397 | ||
398 | /* Refresh ephemeral port. */ | |
399 | if (!bp->port) | |
c720c7e8 | 400 | bp->port = inet_sk(sk)->inet_num; |
1da177e4 | 401 | |
559cf710 VY |
402 | /* Add the address to the bind address list. |
403 | * Use GFP_ATOMIC since BHs will be disabled. | |
404 | */ | |
f57d96b2 | 405 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
1da177e4 LT |
406 | |
407 | /* Copy back into socket for getsockname() use. */ | |
408 | if (!ret) { | |
c720c7e8 | 409 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
1da177e4 LT |
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 | * | |
d808ad9a | 418 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
1da177e4 | 419 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
d808ad9a | 420 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
1da177e4 | 421 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
d808ad9a YH |
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 | |
1da177e4 LT |
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. | |
d808ad9a | 433 | */ |
1da177e4 | 434 | if (asoc->addip_last_asconf) { |
79af02c2 | 435 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
d808ad9a | 436 | goto out; |
1da177e4 LT |
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 | */ | |
04675210 | 463 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
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 | ||
d808ad9a | 486 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
1da177e4 LT |
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 | * | |
d808ad9a | 507 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
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 | */ | |
d808ad9a | 513 | static int sctp_send_asconf_add_ip(struct sock *sk, |
1da177e4 LT |
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; | |
dc022a98 | 524 | union sctp_addr saveaddr; |
1da177e4 LT |
525 | void *addr_buf; |
526 | struct sctp_af *af; | |
1da177e4 LT |
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", | |
0dc47877 | 538 | __func__, sk, addrs, addrcnt); |
1da177e4 | 539 | |
9dbc15f0 | 540 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
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 | |
d808ad9a YH |
552 | * in the bind address list of the association. If so, |
553 | * do not send the asconf chunk to its peer, but continue with | |
1da177e4 LT |
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 | ||
559cf710 VY |
573 | /* Use the first valid address in bind addr list of |
574 | * association as Address Parameter of ASCONF CHUNK. | |
1da177e4 | 575 | */ |
1da177e4 LT |
576 | bp = &asoc->base.bind_addr; |
577 | p = bp->address_list.next; | |
578 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
5ae955cf | 579 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
1da177e4 LT |
580 | addrcnt, SCTP_PARAM_ADD_IP); |
581 | if (!chunk) { | |
582 | retval = -ENOMEM; | |
583 | goto out; | |
584 | } | |
585 | ||
586 | retval = sctp_send_asconf(asoc, chunk); | |
dc022a98 SS |
587 | if (retval) |
588 | goto out; | |
1da177e4 | 589 | |
dc022a98 SS |
590 | /* Add the new addresses to the bind address list with |
591 | * use_as_src set to 0. | |
1da177e4 | 592 | */ |
dc022a98 SS |
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); | |
f57d96b2 VY |
598 | retval = sctp_add_bind_addr(bp, &saveaddr, |
599 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
600 | addr_buf += af->sockaddr_len; |
601 | } | |
1da177e4 LT |
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 | */ | |
04675210 | 623 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
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; | |
1da177e4 | 630 | void *addr_buf; |
c9a08505 | 631 | union sctp_addr *sa_addr; |
1da177e4 LT |
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 | ||
c9a08505 AV |
649 | sa_addr = (union sctp_addr *)addr_buf; |
650 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
1da177e4 LT |
651 | if (!af) { |
652 | retval = -EINVAL; | |
653 | goto err_bindx_rem; | |
654 | } | |
0304ff8a PG |
655 | |
656 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
657 | retval = -EADDRNOTAVAIL; | |
658 | goto err_bindx_rem; | |
659 | } | |
660 | ||
ee9cbaca VY |
661 | if (sa_addr->v4.sin_port && |
662 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
663 | retval = -EINVAL; |
664 | goto err_bindx_rem; | |
665 | } | |
666 | ||
ee9cbaca VY |
667 | if (!sa_addr->v4.sin_port) |
668 | sa_addr->v4.sin_port = htons(bp->port); | |
669 | ||
1da177e4 LT |
670 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
671 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
672 | * be removed. This is something which needs to be looked into | |
673 | * when we are fixing the outstanding issues with multi-homing | |
674 | * socket routing and failover schemes. Refer to comments in | |
675 | * sctp_do_bind(). -daisy | |
676 | */ | |
0ed90fb0 | 677 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
678 | |
679 | addr_buf += af->sockaddr_len; | |
680 | err_bindx_rem: | |
681 | if (retval < 0) { | |
682 | /* Failed. Add the ones that has been removed back */ | |
683 | if (cnt > 0) | |
684 | sctp_bindx_add(sk, addrs, cnt); | |
685 | return retval; | |
686 | } | |
687 | } | |
688 | ||
689 | return retval; | |
690 | } | |
691 | ||
692 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
693 | * the associations that are part of the endpoint indicating that a list of | |
694 | * local addresses are removed from the endpoint. | |
695 | * | |
d808ad9a | 696 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
697 | * association, we do not send the chunk for that association. But it will not |
698 | * affect other associations. | |
699 | * | |
700 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
701 | */ | |
702 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
703 | struct sockaddr *addrs, | |
704 | int addrcnt) | |
705 | { | |
706 | struct sctp_sock *sp; | |
707 | struct sctp_endpoint *ep; | |
708 | struct sctp_association *asoc; | |
dc022a98 | 709 | struct sctp_transport *transport; |
1da177e4 LT |
710 | struct sctp_bind_addr *bp; |
711 | struct sctp_chunk *chunk; | |
712 | union sctp_addr *laddr; | |
713 | void *addr_buf; | |
714 | struct sctp_af *af; | |
dc022a98 | 715 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
716 | int i; |
717 | int retval = 0; | |
718 | ||
719 | if (!sctp_addip_enable) | |
720 | return retval; | |
721 | ||
722 | sp = sctp_sk(sk); | |
723 | ep = sp->ep; | |
724 | ||
725 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
0dc47877 | 726 | __func__, sk, addrs, addrcnt); |
1da177e4 | 727 | |
9dbc15f0 | 728 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
729 | |
730 | if (!asoc->peer.asconf_capable) | |
731 | continue; | |
732 | ||
733 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
734 | continue; | |
735 | ||
736 | if (!sctp_state(asoc, ESTABLISHED)) | |
737 | continue; | |
738 | ||
739 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 740 | * not present in the bind address list of the association. |
1da177e4 LT |
741 | * If so, do not send the asconf chunk to its peer, but |
742 | * continue with other associations. | |
743 | */ | |
744 | addr_buf = addrs; | |
745 | for (i = 0; i < addrcnt; i++) { | |
746 | laddr = (union sctp_addr *)addr_buf; | |
747 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
748 | if (!af) { | |
749 | retval = -EINVAL; | |
750 | goto out; | |
751 | } | |
752 | ||
753 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
754 | break; | |
755 | ||
756 | addr_buf += af->sockaddr_len; | |
757 | } | |
758 | if (i < addrcnt) | |
759 | continue; | |
760 | ||
761 | /* Find one address in the association's bind address list | |
762 | * that is not in the packed array of addresses. This is to | |
763 | * make sure that we do not delete all the addresses in the | |
764 | * association. | |
765 | */ | |
1da177e4 LT |
766 | bp = &asoc->base.bind_addr; |
767 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
768 | addrcnt, sp); | |
1da177e4 LT |
769 | if (!laddr) |
770 | continue; | |
771 | ||
559cf710 VY |
772 | /* We do not need RCU protection throughout this loop |
773 | * because this is done under a socket lock from the | |
774 | * setsockopt call. | |
775 | */ | |
1da177e4 LT |
776 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
777 | SCTP_PARAM_DEL_IP); | |
778 | if (!chunk) { | |
779 | retval = -ENOMEM; | |
780 | goto out; | |
781 | } | |
782 | ||
dc022a98 SS |
783 | /* Reset use_as_src flag for the addresses in the bind address |
784 | * list that are to be deleted. | |
785 | */ | |
dc022a98 SS |
786 | addr_buf = addrs; |
787 | for (i = 0; i < addrcnt; i++) { | |
788 | laddr = (union sctp_addr *)addr_buf; | |
789 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
559cf710 | 790 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 791 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 792 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
793 | } |
794 | addr_buf += af->sockaddr_len; | |
795 | } | |
1da177e4 | 796 | |
dc022a98 SS |
797 | /* Update the route and saddr entries for all the transports |
798 | * as some of the addresses in the bind address list are | |
799 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 800 | */ |
9dbc15f0 RD |
801 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
802 | transports) { | |
dc022a98 SS |
803 | dst_release(transport->dst); |
804 | sctp_transport_route(transport, NULL, | |
805 | sctp_sk(asoc->base.sk)); | |
806 | } | |
807 | ||
808 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
809 | } |
810 | out: | |
811 | return retval; | |
812 | } | |
813 | ||
814 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() | |
815 | * | |
816 | * API 8.1 | |
817 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
818 | * int flags); | |
819 | * | |
820 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
821 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
822 | * or IPv6 addresses. | |
823 | * | |
824 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
825 | * Section 3.1.2 for this usage. | |
826 | * | |
827 | * addrs is a pointer to an array of one or more socket addresses. Each | |
828 | * address is contained in its appropriate structure (i.e. struct | |
829 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 830 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
831 | * representation is termed a "packed array" of addresses). The caller |
832 | * specifies the number of addresses in the array with addrcnt. | |
833 | * | |
834 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
835 | * -1, and sets errno to the appropriate error code. | |
836 | * | |
837 | * For SCTP, the port given in each socket address must be the same, or | |
838 | * sctp_bindx() will fail, setting errno to EINVAL. | |
839 | * | |
840 | * The flags parameter is formed from the bitwise OR of zero or more of | |
841 | * the following currently defined flags: | |
842 | * | |
843 | * SCTP_BINDX_ADD_ADDR | |
844 | * | |
845 | * SCTP_BINDX_REM_ADDR | |
846 | * | |
847 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
848 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
849 | * addresses from the association. The two flags are mutually exclusive; | |
850 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
851 | * not remove all addresses from an association; sctp_bindx() will | |
852 | * reject such an attempt with EINVAL. | |
853 | * | |
854 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
855 | * additional addresses with an endpoint after calling bind(). Or use | |
856 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
857 | * socket is associated with so that no new association accepted will be | |
858 | * associated with those addresses. If the endpoint supports dynamic | |
859 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
860 | * endpoint to send the appropriate message to the peer to change the | |
861 | * peers address lists. | |
862 | * | |
863 | * Adding and removing addresses from a connected association is | |
864 | * optional functionality. Implementations that do not support this | |
865 | * functionality should return EOPNOTSUPP. | |
866 | * | |
867 | * Basically do nothing but copying the addresses from user to kernel | |
868 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
869 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
870 | * from userspace. | |
1da177e4 LT |
871 | * |
872 | * We don't use copy_from_user() for optimization: we first do the | |
873 | * sanity checks (buffer size -fast- and access check-healthy | |
874 | * pointer); if all of those succeed, then we can alloc the memory | |
875 | * (expensive operation) needed to copy the data to kernel. Then we do | |
876 | * the copying without checking the user space area | |
877 | * (__copy_from_user()). | |
878 | * | |
879 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
880 | * it. | |
881 | * | |
882 | * sk The sk of the socket | |
883 | * addrs The pointer to the addresses in user land | |
884 | * addrssize Size of the addrs buffer | |
885 | * op Operation to perform (add or remove, see the flags of | |
886 | * sctp_bindx) | |
887 | * | |
888 | * Returns 0 if ok, <0 errno code on error. | |
889 | */ | |
890 | SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk, | |
891 | struct sockaddr __user *addrs, | |
892 | int addrs_size, int op) | |
893 | { | |
894 | struct sockaddr *kaddrs; | |
895 | int err; | |
896 | int addrcnt = 0; | |
897 | int walk_size = 0; | |
898 | struct sockaddr *sa_addr; | |
899 | void *addr_buf; | |
900 | struct sctp_af *af; | |
901 | ||
902 | SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p" | |
903 | " addrs_size %d opt %d\n", sk, addrs, addrs_size, op); | |
904 | ||
905 | if (unlikely(addrs_size <= 0)) | |
906 | return -EINVAL; | |
907 | ||
908 | /* Check the user passed a healthy pointer. */ | |
909 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
910 | return -EFAULT; | |
911 | ||
912 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 913 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1da177e4 LT |
914 | if (unlikely(!kaddrs)) |
915 | return -ENOMEM; | |
916 | ||
917 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
918 | kfree(kaddrs); | |
919 | return -EFAULT; | |
920 | } | |
921 | ||
d808ad9a | 922 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
923 | addr_buf = kaddrs; |
924 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
925 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
926 | kfree(kaddrs); | |
927 | return -EINVAL; | |
928 | } | |
929 | ||
1da177e4 LT |
930 | sa_addr = (struct sockaddr *)addr_buf; |
931 | af = sctp_get_af_specific(sa_addr->sa_family); | |
932 | ||
933 | /* If the address family is not supported or if this address | |
934 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 935 | */ |
1da177e4 LT |
936 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
937 | kfree(kaddrs); | |
938 | return -EINVAL; | |
939 | } | |
940 | addrcnt++; | |
941 | addr_buf += af->sockaddr_len; | |
942 | walk_size += af->sockaddr_len; | |
943 | } | |
944 | ||
945 | /* Do the work. */ | |
946 | switch (op) { | |
947 | case SCTP_BINDX_ADD_ADDR: | |
948 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
949 | if (err) | |
950 | goto out; | |
951 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
952 | break; | |
953 | ||
954 | case SCTP_BINDX_REM_ADDR: | |
955 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
956 | if (err) | |
957 | goto out; | |
958 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
959 | break; | |
960 | ||
961 | default: | |
962 | err = -EINVAL; | |
963 | break; | |
3ff50b79 | 964 | } |
1da177e4 LT |
965 | |
966 | out: | |
967 | kfree(kaddrs); | |
968 | ||
969 | return err; | |
970 | } | |
971 | ||
3f7a87d2 FF |
972 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
973 | * | |
974 | * Common routine for handling connect() and sctp_connectx(). | |
975 | * Connect will come in with just a single address. | |
976 | */ | |
977 | static int __sctp_connect(struct sock* sk, | |
978 | struct sockaddr *kaddrs, | |
88a0a948 VY |
979 | int addrs_size, |
980 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
981 | { |
982 | struct sctp_sock *sp; | |
983 | struct sctp_endpoint *ep; | |
984 | struct sctp_association *asoc = NULL; | |
985 | struct sctp_association *asoc2; | |
986 | struct sctp_transport *transport; | |
987 | union sctp_addr to; | |
988 | struct sctp_af *af; | |
989 | sctp_scope_t scope; | |
990 | long timeo; | |
991 | int err = 0; | |
992 | int addrcnt = 0; | |
993 | int walk_size = 0; | |
e4d1feab | 994 | union sctp_addr *sa_addr = NULL; |
3f7a87d2 | 995 | void *addr_buf; |
16d00fb7 | 996 | unsigned short port; |
f50f95ca | 997 | unsigned int f_flags = 0; |
3f7a87d2 FF |
998 | |
999 | sp = sctp_sk(sk); | |
1000 | ep = sp->ep; | |
1001 | ||
1002 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
1003 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1004 | * is already connected. | |
1005 | * It cannot be done even on a TCP-style listening socket. | |
1006 | */ | |
1007 | if (sctp_sstate(sk, ESTABLISHED) || | |
1008 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1009 | err = -EISCONN; | |
1010 | goto out_free; | |
1011 | } | |
1012 | ||
1013 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1014 | addr_buf = kaddrs; | |
1015 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
1016 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
1017 | err = -EINVAL; | |
1018 | goto out_free; | |
1019 | } | |
1020 | ||
4bdf4b5f AV |
1021 | sa_addr = (union sctp_addr *)addr_buf; |
1022 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
3f7a87d2 FF |
1023 | |
1024 | /* If the address family is not supported or if this address | |
1025 | * causes the address buffer to overflow return EINVAL. | |
1026 | */ | |
1027 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1028 | err = -EINVAL; | |
1029 | goto out_free; | |
1030 | } | |
1031 | ||
d7e0d19a DR |
1032 | port = ntohs(sa_addr->v4.sin_port); |
1033 | ||
e4d1feab VY |
1034 | /* Save current address so we can work with it */ |
1035 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1036 | ||
1037 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
3f7a87d2 FF |
1038 | if (err) |
1039 | goto out_free; | |
1040 | ||
16d00fb7 VY |
1041 | /* Make sure the destination port is correctly set |
1042 | * in all addresses. | |
1043 | */ | |
1044 | if (asoc && asoc->peer.port && asoc->peer.port != port) | |
1045 | goto out_free; | |
1046 | ||
3f7a87d2 FF |
1047 | |
1048 | /* Check if there already is a matching association on the | |
1049 | * endpoint (other than the one created here). | |
1050 | */ | |
e4d1feab | 1051 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1052 | if (asoc2 && asoc2 != asoc) { |
1053 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1054 | err = -EISCONN; | |
1055 | else | |
1056 | err = -EALREADY; | |
1057 | goto out_free; | |
1058 | } | |
1059 | ||
1060 | /* If we could not find a matching association on the endpoint, | |
1061 | * make sure that there is no peeled-off association matching | |
1062 | * the peer address even on another socket. | |
1063 | */ | |
e4d1feab | 1064 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1065 | err = -EADDRNOTAVAIL; |
1066 | goto out_free; | |
1067 | } | |
1068 | ||
1069 | if (!asoc) { | |
1070 | /* If a bind() or sctp_bindx() is not called prior to | |
1071 | * an sctp_connectx() call, the system picks an | |
1072 | * ephemeral port and will choose an address set | |
1073 | * equivalent to binding with a wildcard address. | |
1074 | */ | |
1075 | if (!ep->base.bind_addr.port) { | |
1076 | if (sctp_autobind(sk)) { | |
1077 | err = -EAGAIN; | |
1078 | goto out_free; | |
1079 | } | |
64a0c1c8 ISJ |
1080 | } else { |
1081 | /* | |
d808ad9a YH |
1082 | * If an unprivileged user inherits a 1-many |
1083 | * style socket with open associations on a | |
1084 | * privileged port, it MAY be permitted to | |
1085 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1086 | * be permitted to open new associations. |
1087 | */ | |
1088 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1089 | !capable(CAP_NET_BIND_SERVICE)) { | |
1090 | err = -EACCES; | |
1091 | goto out_free; | |
1092 | } | |
3f7a87d2 FF |
1093 | } |
1094 | ||
e4d1feab | 1095 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1096 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1097 | if (!asoc) { | |
1098 | err = -ENOMEM; | |
1099 | goto out_free; | |
1100 | } | |
409b95af VY |
1101 | |
1102 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1103 | GFP_KERNEL); | |
1104 | if (err < 0) { | |
1105 | goto out_free; | |
1106 | } | |
1107 | ||
3f7a87d2 FF |
1108 | } |
1109 | ||
1110 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1111 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1112 | SCTP_UNKNOWN); |
1113 | if (!transport) { | |
1114 | err = -ENOMEM; | |
1115 | goto out_free; | |
1116 | } | |
1117 | ||
1118 | addrcnt++; | |
1119 | addr_buf += af->sockaddr_len; | |
1120 | walk_size += af->sockaddr_len; | |
1121 | } | |
1122 | ||
c6ba68a2 VY |
1123 | /* In case the user of sctp_connectx() wants an association |
1124 | * id back, assign one now. | |
1125 | */ | |
1126 | if (assoc_id) { | |
1127 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1128 | if (err < 0) | |
1129 | goto out_free; | |
1130 | } | |
1131 | ||
3f7a87d2 FF |
1132 | err = sctp_primitive_ASSOCIATE(asoc, NULL); |
1133 | if (err < 0) { | |
1134 | goto out_free; | |
1135 | } | |
1136 | ||
1137 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1138 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
e4d1feab VY |
1139 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1140 | af->to_sk_daddr(sa_addr, sk); | |
8de8c873 | 1141 | sk->sk_err = 0; |
3f7a87d2 | 1142 | |
f50f95ca VY |
1143 | /* in-kernel sockets don't generally have a file allocated to them |
1144 | * if all they do is call sock_create_kern(). | |
1145 | */ | |
1146 | if (sk->sk_socket->file) | |
1147 | f_flags = sk->sk_socket->file->f_flags; | |
1148 | ||
1149 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1150 | ||
3f7a87d2 | 1151 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1152 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1153 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1154 | |
1155 | /* Don't free association on exit. */ | |
1156 | asoc = NULL; | |
1157 | ||
1158 | out_free: | |
1159 | ||
1160 | SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p" | |
d808ad9a YH |
1161 | " kaddrs: %p err: %d\n", |
1162 | asoc, kaddrs, err); | |
3f7a87d2 FF |
1163 | if (asoc) |
1164 | sctp_association_free(asoc); | |
1165 | return err; | |
1166 | } | |
1167 | ||
1168 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1169 | * | |
1170 | * API 8.9 | |
88a0a948 VY |
1171 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1172 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1173 | * |
1174 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1175 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1176 | * or IPv6 addresses. | |
1177 | * | |
1178 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1179 | * Section 3.1.2 for this usage. | |
1180 | * | |
1181 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1182 | * address is contained in its appropriate structure (i.e. struct | |
1183 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1184 | * must be used to distengish the address length (note that this | |
1185 | * representation is termed a "packed array" of addresses). The caller | |
1186 | * specifies the number of addresses in the array with addrcnt. | |
1187 | * | |
88a0a948 VY |
1188 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1189 | * the association id of the new association. On failure, sctp_connectx() | |
1190 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1191 | * is not touched by the kernel. | |
3f7a87d2 FF |
1192 | * |
1193 | * For SCTP, the port given in each socket address must be the same, or | |
1194 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1195 | * | |
1196 | * An application can use sctp_connectx to initiate an association with | |
1197 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1198 | * allows a caller to specify multiple addresses at which a peer can be | |
1199 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1200 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1201 | * specifies that the stack will try to make use of all the addresses in |
1202 | * the list when needed. | |
1203 | * | |
1204 | * Note that the list of addresses passed in is only used for setting up | |
1205 | * the association. It does not necessarily equal the set of addresses | |
1206 | * the peer uses for the resulting association. If the caller wants to | |
1207 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1208 | * retrieve them after the association has been set up. | |
1209 | * | |
1210 | * Basically do nothing but copying the addresses from user to kernel | |
1211 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1212 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1213 | * | |
1214 | * We don't use copy_from_user() for optimization: we first do the | |
1215 | * sanity checks (buffer size -fast- and access check-healthy | |
1216 | * pointer); if all of those succeed, then we can alloc the memory | |
1217 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1218 | * the copying without checking the user space area | |
1219 | * (__copy_from_user()). | |
1220 | * | |
1221 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1222 | * it. | |
1223 | * | |
1224 | * sk The sk of the socket | |
1225 | * addrs The pointer to the addresses in user land | |
1226 | * addrssize Size of the addrs buffer | |
1227 | * | |
88a0a948 | 1228 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1229 | */ |
88a0a948 | 1230 | SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk, |
3f7a87d2 | 1231 | struct sockaddr __user *addrs, |
88a0a948 VY |
1232 | int addrs_size, |
1233 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1234 | { |
1235 | int err = 0; | |
1236 | struct sockaddr *kaddrs; | |
1237 | ||
1238 | SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n", | |
0dc47877 | 1239 | __func__, sk, addrs, addrs_size); |
3f7a87d2 FF |
1240 | |
1241 | if (unlikely(addrs_size <= 0)) | |
1242 | return -EINVAL; | |
1243 | ||
1244 | /* Check the user passed a healthy pointer. */ | |
1245 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1246 | return -EFAULT; | |
1247 | ||
1248 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 1249 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
3f7a87d2 FF |
1250 | if (unlikely(!kaddrs)) |
1251 | return -ENOMEM; | |
1252 | ||
1253 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1254 | err = -EFAULT; | |
1255 | } else { | |
88a0a948 | 1256 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1257 | } |
1258 | ||
1259 | kfree(kaddrs); | |
88a0a948 | 1260 | |
3f7a87d2 FF |
1261 | return err; |
1262 | } | |
1263 | ||
88a0a948 VY |
1264 | /* |
1265 | * This is an older interface. It's kept for backward compatibility | |
1266 | * to the option that doesn't provide association id. | |
1267 | */ | |
1268 | SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk, | |
1269 | struct sockaddr __user *addrs, | |
1270 | int addrs_size) | |
1271 | { | |
1272 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1273 | } | |
1274 | ||
1275 | /* | |
1276 | * New interface for the API. The since the API is done with a socket | |
1277 | * option, to make it simple we feed back the association id is as a return | |
1278 | * indication to the call. Error is always negative and association id is | |
1279 | * always positive. | |
1280 | */ | |
1281 | SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk, | |
1282 | struct sockaddr __user *addrs, | |
1283 | int addrs_size) | |
1284 | { | |
1285 | sctp_assoc_t assoc_id = 0; | |
1286 | int err = 0; | |
1287 | ||
1288 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1289 | ||
1290 | if (err) | |
1291 | return err; | |
1292 | else | |
1293 | return assoc_id; | |
1294 | } | |
1295 | ||
c6ba68a2 | 1296 | /* |
f9c67811 VY |
1297 | * New (hopefully final) interface for the API. |
1298 | * We use the sctp_getaddrs_old structure so that use-space library | |
1299 | * can avoid any unnecessary allocations. The only defferent part | |
1300 | * is that we store the actual length of the address buffer into the | |
1301 | * addrs_num structure member. That way we can re-use the existing | |
1302 | * code. | |
c6ba68a2 VY |
1303 | */ |
1304 | SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len, | |
1305 | char __user *optval, | |
1306 | int __user *optlen) | |
1307 | { | |
f9c67811 | 1308 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1309 | sctp_assoc_t assoc_id = 0; |
1310 | int err = 0; | |
1311 | ||
f9c67811 | 1312 | if (len < sizeof(param)) |
c6ba68a2 VY |
1313 | return -EINVAL; |
1314 | ||
f9c67811 VY |
1315 | if (copy_from_user(¶m, optval, sizeof(param))) |
1316 | return -EFAULT; | |
1317 | ||
c6ba68a2 | 1318 | err = __sctp_setsockopt_connectx(sk, |
f9c67811 VY |
1319 | (struct sockaddr __user *)param.addrs, |
1320 | param.addr_num, &assoc_id); | |
c6ba68a2 VY |
1321 | |
1322 | if (err == 0 || err == -EINPROGRESS) { | |
1323 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1324 | return -EFAULT; | |
1325 | if (put_user(sizeof(assoc_id), optlen)) | |
1326 | return -EFAULT; | |
1327 | } | |
1328 | ||
1329 | return err; | |
1330 | } | |
1331 | ||
1da177e4 LT |
1332 | /* API 3.1.4 close() - UDP Style Syntax |
1333 | * Applications use close() to perform graceful shutdown (as described in | |
1334 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1335 | * by a UDP-style socket. | |
1336 | * | |
1337 | * The syntax is | |
1338 | * | |
1339 | * ret = close(int sd); | |
1340 | * | |
1341 | * sd - the socket descriptor of the associations to be closed. | |
1342 | * | |
1343 | * To gracefully shutdown a specific association represented by the | |
1344 | * UDP-style socket, an application should use the sendmsg() call, | |
1345 | * passing no user data, but including the appropriate flag in the | |
1346 | * ancillary data (see Section xxxx). | |
1347 | * | |
1348 | * If sd in the close() call is a branched-off socket representing only | |
1349 | * one association, the shutdown is performed on that association only. | |
1350 | * | |
1351 | * 4.1.6 close() - TCP Style Syntax | |
1352 | * | |
1353 | * Applications use close() to gracefully close down an association. | |
1354 | * | |
1355 | * The syntax is: | |
1356 | * | |
1357 | * int close(int sd); | |
1358 | * | |
1359 | * sd - the socket descriptor of the association to be closed. | |
1360 | * | |
1361 | * After an application calls close() on a socket descriptor, no further | |
1362 | * socket operations will succeed on that descriptor. | |
1363 | * | |
1364 | * API 7.1.4 SO_LINGER | |
1365 | * | |
1366 | * An application using the TCP-style socket can use this option to | |
1367 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1368 | * | |
1369 | * struct linger { | |
1370 | * int l_onoff; // option on/off | |
1371 | * int l_linger; // linger time | |
1372 | * }; | |
1373 | * | |
1374 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1375 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1376 | * value is set to a negative value, the setsockopt() call will return | |
1377 | * an error. If the value is set to a positive value linger_time, the | |
1378 | * close() can be blocked for at most linger_time ms. If the graceful | |
1379 | * shutdown phase does not finish during this period, close() will | |
1380 | * return but the graceful shutdown phase continues in the system. | |
1381 | */ | |
1382 | SCTP_STATIC void sctp_close(struct sock *sk, long timeout) | |
1383 | { | |
1384 | struct sctp_endpoint *ep; | |
1385 | struct sctp_association *asoc; | |
1386 | struct list_head *pos, *temp; | |
cd4fcc70 | 1387 | unsigned int data_was_unread; |
1da177e4 LT |
1388 | |
1389 | SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout); | |
1390 | ||
1391 | sctp_lock_sock(sk); | |
1392 | sk->sk_shutdown = SHUTDOWN_MASK; | |
bec9640b | 1393 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1394 | |
1395 | ep = sctp_sk(sk)->ep; | |
1396 | ||
cd4fcc70 TG |
1397 | /* Clean up any skbs sitting on the receive queue. */ |
1398 | data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1399 | data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1400 | ||
61c9fed4 | 1401 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1402 | list_for_each_safe(pos, temp, &ep->asocs) { |
1403 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1404 | ||
1405 | if (sctp_style(sk, TCP)) { | |
1406 | /* A closed association can still be in the list if | |
1407 | * it belongs to a TCP-style listening socket that is | |
1408 | * not yet accepted. If so, free it. If not, send an | |
1409 | * ABORT or SHUTDOWN based on the linger options. | |
1410 | */ | |
1411 | if (sctp_state(asoc, CLOSED)) { | |
1412 | sctp_unhash_established(asoc); | |
1413 | sctp_association_free(asoc); | |
b89498a1 VY |
1414 | continue; |
1415 | } | |
1416 | } | |
1da177e4 | 1417 | |
cd4fcc70 TG |
1418 | if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) || |
1419 | !skb_queue_empty(&asoc->ulpq.reasm) || | |
1420 | (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) { | |
b9ac8672 SS |
1421 | struct sctp_chunk *chunk; |
1422 | ||
1423 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1424 | if (chunk) | |
1425 | sctp_primitive_ABORT(asoc, chunk); | |
1426 | } else | |
1da177e4 LT |
1427 | sctp_primitive_SHUTDOWN(asoc, NULL); |
1428 | } | |
1429 | ||
1da177e4 LT |
1430 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1431 | if (sctp_style(sk, TCP) && timeout) | |
1432 | sctp_wait_for_close(sk, timeout); | |
1433 | ||
1434 | /* This will run the backlog queue. */ | |
1435 | sctp_release_sock(sk); | |
1436 | ||
1437 | /* Supposedly, no process has access to the socket, but | |
1438 | * the net layers still may. | |
1439 | */ | |
1440 | sctp_local_bh_disable(); | |
1441 | sctp_bh_lock_sock(sk); | |
1442 | ||
1443 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1444 | * and we have just a little more cleanup. | |
1445 | */ | |
1446 | sock_hold(sk); | |
1447 | sk_common_release(sk); | |
1448 | ||
1449 | sctp_bh_unlock_sock(sk); | |
1450 | sctp_local_bh_enable(); | |
1451 | ||
1452 | sock_put(sk); | |
1453 | ||
1454 | SCTP_DBG_OBJCNT_DEC(sock); | |
1455 | } | |
1456 | ||
1457 | /* Handle EPIPE error. */ | |
1458 | static int sctp_error(struct sock *sk, int flags, int err) | |
1459 | { | |
1460 | if (err == -EPIPE) | |
1461 | err = sock_error(sk) ? : -EPIPE; | |
1462 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1463 | send_sig(SIGPIPE, current, 0); | |
1464 | return err; | |
1465 | } | |
1466 | ||
1467 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1468 | * | |
1469 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1470 | * and receive data from its peer. | |
1471 | * | |
1472 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1473 | * int flags); | |
1474 | * | |
1475 | * socket - the socket descriptor of the endpoint. | |
1476 | * message - pointer to the msghdr structure which contains a single | |
1477 | * user message and possibly some ancillary data. | |
1478 | * | |
1479 | * See Section 5 for complete description of the data | |
1480 | * structures. | |
1481 | * | |
1482 | * flags - flags sent or received with the user message, see Section | |
1483 | * 5 for complete description of the flags. | |
1484 | * | |
1485 | * Note: This function could use a rewrite especially when explicit | |
1486 | * connect support comes in. | |
1487 | */ | |
1488 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1489 | ||
1490 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); | |
1491 | ||
1492 | SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
1493 | struct msghdr *msg, size_t msg_len) | |
1494 | { | |
1495 | struct sctp_sock *sp; | |
1496 | struct sctp_endpoint *ep; | |
1497 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1498 | struct sctp_transport *transport, *chunk_tp; | |
1499 | struct sctp_chunk *chunk; | |
dce116ae | 1500 | union sctp_addr to; |
1da177e4 | 1501 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1502 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1503 | struct sctp_sndrcvinfo *sinfo; |
1504 | struct sctp_initmsg *sinit; | |
1505 | sctp_assoc_t associd = 0; | |
1506 | sctp_cmsgs_t cmsgs = { NULL }; | |
1507 | int err; | |
1508 | sctp_scope_t scope; | |
1509 | long timeo; | |
1510 | __u16 sinfo_flags = 0; | |
1511 | struct sctp_datamsg *datamsg; | |
1da177e4 LT |
1512 | int msg_flags = msg->msg_flags; |
1513 | ||
1514 | SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n", | |
1515 | sk, msg, msg_len); | |
1516 | ||
1517 | err = 0; | |
1518 | sp = sctp_sk(sk); | |
1519 | ep = sp->ep; | |
1520 | ||
3f7a87d2 | 1521 | SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep); |
1da177e4 LT |
1522 | |
1523 | /* We cannot send a message over a TCP-style listening socket. */ | |
1524 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1525 | err = -EPIPE; | |
1526 | goto out_nounlock; | |
1527 | } | |
1528 | ||
1529 | /* Parse out the SCTP CMSGs. */ | |
1530 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1531 | ||
1532 | if (err) { | |
1533 | SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err); | |
1534 | goto out_nounlock; | |
1535 | } | |
1536 | ||
1537 | /* Fetch the destination address for this packet. This | |
1538 | * address only selects the association--it is not necessarily | |
1539 | * the address we will send to. | |
1540 | * For a peeled-off socket, msg_name is ignored. | |
1541 | */ | |
1542 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1543 | int msg_namelen = msg->msg_namelen; | |
1544 | ||
1545 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1546 | msg_namelen); | |
1547 | if (err) | |
1548 | return err; | |
1549 | ||
1550 | if (msg_namelen > sizeof(to)) | |
1551 | msg_namelen = sizeof(to); | |
1552 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1553 | msg_name = msg->msg_name; |
1554 | } | |
1555 | ||
1556 | sinfo = cmsgs.info; | |
1557 | sinit = cmsgs.init; | |
1558 | ||
1559 | /* Did the user specify SNDRCVINFO? */ | |
1560 | if (sinfo) { | |
1561 | sinfo_flags = sinfo->sinfo_flags; | |
1562 | associd = sinfo->sinfo_assoc_id; | |
1563 | } | |
1564 | ||
1565 | SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n", | |
1566 | msg_len, sinfo_flags); | |
1567 | ||
eaa5c54d ISJ |
1568 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1569 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1570 | err = -EINVAL; |
1571 | goto out_nounlock; | |
1572 | } | |
1573 | ||
eaa5c54d ISJ |
1574 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1575 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1576 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1577 | * the msg_iov set to the user abort reason. |
d808ad9a | 1578 | */ |
eaa5c54d ISJ |
1579 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1580 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1581 | err = -EINVAL; |
1582 | goto out_nounlock; | |
1583 | } | |
1584 | ||
eaa5c54d | 1585 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1586 | * specified in msg_name. |
1587 | */ | |
eaa5c54d | 1588 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1589 | err = -EINVAL; |
1590 | goto out_nounlock; | |
1591 | } | |
1592 | ||
1593 | transport = NULL; | |
1594 | ||
1595 | SCTP_DEBUG_PRINTK("About to look up association.\n"); | |
1596 | ||
1597 | sctp_lock_sock(sk); | |
1598 | ||
1599 | /* If a msg_name has been specified, assume this is to be used. */ | |
1600 | if (msg_name) { | |
1601 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1602 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1603 | if (!asoc) { |
1604 | /* If we could not find a matching association on the | |
1605 | * endpoint, make sure that it is not a TCP-style | |
1606 | * socket that already has an association or there is | |
1607 | * no peeled-off association on another socket. | |
1608 | */ | |
1609 | if ((sctp_style(sk, TCP) && | |
1610 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1611 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1612 | err = -EADDRNOTAVAIL; |
1613 | goto out_unlock; | |
1614 | } | |
1615 | } | |
1616 | } else { | |
1617 | asoc = sctp_id2assoc(sk, associd); | |
1618 | if (!asoc) { | |
1619 | err = -EPIPE; | |
1620 | goto out_unlock; | |
1621 | } | |
1622 | } | |
1623 | ||
1624 | if (asoc) { | |
1625 | SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc); | |
1626 | ||
1627 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1628 | * socket that has an association in CLOSED state. This can | |
1629 | * happen when an accepted socket has an association that is | |
1630 | * already CLOSED. | |
1631 | */ | |
1632 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1633 | err = -EPIPE; | |
1634 | goto out_unlock; | |
1635 | } | |
1636 | ||
eaa5c54d | 1637 | if (sinfo_flags & SCTP_EOF) { |
1da177e4 LT |
1638 | SCTP_DEBUG_PRINTK("Shutting down association: %p\n", |
1639 | asoc); | |
1640 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
1641 | err = 0; | |
1642 | goto out_unlock; | |
1643 | } | |
eaa5c54d | 1644 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1645 | |
1646 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1647 | if (!chunk) { | |
1648 | err = -ENOMEM; | |
1649 | goto out_unlock; | |
1650 | } | |
1651 | ||
1da177e4 | 1652 | SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc); |
c164a9ba | 1653 | sctp_primitive_ABORT(asoc, chunk); |
1da177e4 LT |
1654 | err = 0; |
1655 | goto out_unlock; | |
1656 | } | |
1657 | } | |
1658 | ||
1659 | /* Do we need to create the association? */ | |
1660 | if (!asoc) { | |
1661 | SCTP_DEBUG_PRINTK("There is no association yet.\n"); | |
1662 | ||
eaa5c54d | 1663 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1664 | err = -EINVAL; |
1665 | goto out_unlock; | |
1666 | } | |
1667 | ||
1668 | /* Check for invalid stream against the stream counts, | |
1669 | * either the default or the user specified stream counts. | |
1670 | */ | |
1671 | if (sinfo) { | |
1672 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1673 | /* Check against the defaults. */ | |
1674 | if (sinfo->sinfo_stream >= | |
1675 | sp->initmsg.sinit_num_ostreams) { | |
1676 | err = -EINVAL; | |
1677 | goto out_unlock; | |
1678 | } | |
1679 | } else { | |
1680 | /* Check against the requested. */ | |
1681 | if (sinfo->sinfo_stream >= | |
1682 | sinit->sinit_num_ostreams) { | |
1683 | err = -EINVAL; | |
1684 | goto out_unlock; | |
1685 | } | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | /* | |
1690 | * API 3.1.2 bind() - UDP Style Syntax | |
1691 | * If a bind() or sctp_bindx() is not called prior to a | |
1692 | * sendmsg() call that initiates a new association, the | |
1693 | * system picks an ephemeral port and will choose an address | |
1694 | * set equivalent to binding with a wildcard address. | |
1695 | */ | |
1696 | if (!ep->base.bind_addr.port) { | |
1697 | if (sctp_autobind(sk)) { | |
1698 | err = -EAGAIN; | |
1699 | goto out_unlock; | |
1700 | } | |
64a0c1c8 ISJ |
1701 | } else { |
1702 | /* | |
1703 | * If an unprivileged user inherits a one-to-many | |
1704 | * style socket with open associations on a privileged | |
1705 | * port, it MAY be permitted to accept new associations, | |
1706 | * but it SHOULD NOT be permitted to open new | |
1707 | * associations. | |
1708 | */ | |
1709 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1710 | !capable(CAP_NET_BIND_SERVICE)) { | |
1711 | err = -EACCES; | |
1712 | goto out_unlock; | |
1713 | } | |
1da177e4 LT |
1714 | } |
1715 | ||
1716 | scope = sctp_scope(&to); | |
1717 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1718 | if (!new_asoc) { | |
1719 | err = -ENOMEM; | |
1720 | goto out_unlock; | |
1721 | } | |
1722 | asoc = new_asoc; | |
409b95af VY |
1723 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1724 | if (err < 0) { | |
1725 | err = -ENOMEM; | |
1726 | goto out_free; | |
1727 | } | |
1da177e4 LT |
1728 | |
1729 | /* If the SCTP_INIT ancillary data is specified, set all | |
1730 | * the association init values accordingly. | |
1731 | */ | |
1732 | if (sinit) { | |
1733 | if (sinit->sinit_num_ostreams) { | |
1734 | asoc->c.sinit_num_ostreams = | |
1735 | sinit->sinit_num_ostreams; | |
1736 | } | |
1737 | if (sinit->sinit_max_instreams) { | |
1738 | asoc->c.sinit_max_instreams = | |
1739 | sinit->sinit_max_instreams; | |
1740 | } | |
1741 | if (sinit->sinit_max_attempts) { | |
1742 | asoc->max_init_attempts | |
1743 | = sinit->sinit_max_attempts; | |
1744 | } | |
1745 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1746 | asoc->max_init_timeo = |
1da177e4 LT |
1747 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1748 | } | |
1749 | } | |
1750 | ||
1751 | /* Prime the peer's transport structures. */ | |
dce116ae | 1752 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1753 | if (!transport) { |
1754 | err = -ENOMEM; | |
1755 | goto out_free; | |
1756 | } | |
1da177e4 LT |
1757 | } |
1758 | ||
1759 | /* ASSERT: we have a valid association at this point. */ | |
1760 | SCTP_DEBUG_PRINTK("We have a valid association.\n"); | |
1761 | ||
1762 | if (!sinfo) { | |
1763 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1764 | * some defaults. | |
1765 | */ | |
517aa0bc | 1766 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1767 | default_sinfo.sinfo_stream = asoc->default_stream; |
1768 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1769 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1770 | default_sinfo.sinfo_context = asoc->default_context; | |
1771 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1772 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1773 | sinfo = &default_sinfo; | |
1774 | } | |
1775 | ||
1776 | /* API 7.1.7, the sndbuf size per association bounds the | |
1777 | * maximum size of data that can be sent in a single send call. | |
1778 | */ | |
1779 | if (msg_len > sk->sk_sndbuf) { | |
1780 | err = -EMSGSIZE; | |
1781 | goto out_free; | |
1782 | } | |
1783 | ||
8a479491 VY |
1784 | if (asoc->pmtu_pending) |
1785 | sctp_assoc_pending_pmtu(asoc); | |
1786 | ||
1da177e4 LT |
1787 | /* If fragmentation is disabled and the message length exceeds the |
1788 | * association fragmentation point, return EMSGSIZE. The I-D | |
1789 | * does not specify what this error is, but this looks like | |
1790 | * a great fit. | |
1791 | */ | |
1792 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1793 | err = -EMSGSIZE; | |
1794 | goto out_free; | |
1795 | } | |
1796 | ||
afd7614c JP |
1797 | /* Check for invalid stream. */ |
1798 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1799 | err = -EINVAL; | |
1800 | goto out_free; | |
1da177e4 LT |
1801 | } |
1802 | ||
1803 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1804 | if (!sctp_wspace(asoc)) { | |
1805 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1806 | if (err) | |
1807 | goto out_free; | |
1808 | } | |
1809 | ||
1810 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1811 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1812 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1813 | */ |
1814 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1815 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1816 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1817 | if (!chunk_tp) { |
1818 | err = -EINVAL; | |
1819 | goto out_free; | |
1820 | } | |
1821 | } else | |
1822 | chunk_tp = NULL; | |
1823 | ||
1824 | /* Auto-connect, if we aren't connected already. */ | |
1825 | if (sctp_state(asoc, CLOSED)) { | |
1826 | err = sctp_primitive_ASSOCIATE(asoc, NULL); | |
1827 | if (err < 0) | |
1828 | goto out_free; | |
1829 | SCTP_DEBUG_PRINTK("We associated primitively.\n"); | |
1830 | } | |
1831 | ||
1832 | /* Break the message into multiple chunks of maximum size. */ | |
1833 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
1834 | if (!datamsg) { | |
1835 | err = -ENOMEM; | |
1836 | goto out_free; | |
1837 | } | |
1838 | ||
1839 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1840 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
80445cfb | 1841 | sctp_chunk_hold(chunk); |
1da177e4 LT |
1842 | |
1843 | /* Do accounting for the write space. */ | |
1844 | sctp_set_owner_w(chunk); | |
1845 | ||
1846 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1847 | } |
1848 | ||
9c5c62be VY |
1849 | /* Send it to the lower layers. Note: all chunks |
1850 | * must either fail or succeed. The lower layer | |
1851 | * works that way today. Keep it that way or this | |
1852 | * breaks. | |
1853 | */ | |
1854 | err = sctp_primitive_SEND(asoc, datamsg); | |
1855 | /* Did the lower layer accept the chunk? */ | |
1856 | if (err) | |
1857 | sctp_datamsg_free(datamsg); | |
1858 | else | |
1859 | sctp_datamsg_put(datamsg); | |
1860 | ||
1861 | SCTP_DEBUG_PRINTK("We sent primitively.\n"); | |
1862 | ||
1da177e4 LT |
1863 | if (err) |
1864 | goto out_free; | |
1865 | else | |
1866 | err = msg_len; | |
1867 | ||
1868 | /* If we are already past ASSOCIATE, the lower | |
1869 | * layers are responsible for association cleanup. | |
1870 | */ | |
1871 | goto out_unlock; | |
1872 | ||
1873 | out_free: | |
1874 | if (new_asoc) | |
1875 | sctp_association_free(asoc); | |
1876 | out_unlock: | |
1877 | sctp_release_sock(sk); | |
1878 | ||
1879 | out_nounlock: | |
1880 | return sctp_error(sk, msg_flags, err); | |
1881 | ||
1882 | #if 0 | |
1883 | do_sock_err: | |
1884 | if (msg_len) | |
1885 | err = msg_len; | |
1886 | else | |
1887 | err = sock_error(sk); | |
1888 | goto out; | |
1889 | ||
1890 | do_interrupted: | |
1891 | if (msg_len) | |
1892 | err = msg_len; | |
1893 | goto out; | |
1894 | #endif /* 0 */ | |
1895 | } | |
1896 | ||
1897 | /* This is an extended version of skb_pull() that removes the data from the | |
1898 | * start of a skb even when data is spread across the list of skb's in the | |
1899 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1900 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1901 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1902 | * could not be removed. | |
1903 | */ | |
1904 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1905 | { | |
1906 | struct sk_buff *list; | |
1907 | int skb_len = skb_headlen(skb); | |
1908 | int rlen; | |
1909 | ||
1910 | if (len <= skb_len) { | |
1911 | __skb_pull(skb, len); | |
1912 | return 0; | |
1913 | } | |
1914 | len -= skb_len; | |
1915 | __skb_pull(skb, skb_len); | |
1916 | ||
1b003be3 | 1917 | skb_walk_frags(skb, list) { |
1da177e4 LT |
1918 | rlen = sctp_skb_pull(list, len); |
1919 | skb->len -= (len-rlen); | |
1920 | skb->data_len -= (len-rlen); | |
1921 | ||
1922 | if (!rlen) | |
1923 | return 0; | |
1924 | ||
1925 | len = rlen; | |
1926 | } | |
1927 | ||
1928 | return len; | |
1929 | } | |
1930 | ||
1931 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
1932 | * | |
1933 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
1934 | * int flags); | |
1935 | * | |
1936 | * socket - the socket descriptor of the endpoint. | |
1937 | * message - pointer to the msghdr structure which contains a single | |
1938 | * user message and possibly some ancillary data. | |
1939 | * | |
1940 | * See Section 5 for complete description of the data | |
1941 | * structures. | |
1942 | * | |
1943 | * flags - flags sent or received with the user message, see Section | |
1944 | * 5 for complete description of the flags. | |
1945 | */ | |
1946 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
1947 | ||
1948 | SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, | |
1949 | struct msghdr *msg, size_t len, int noblock, | |
1950 | int flags, int *addr_len) | |
1951 | { | |
1952 | struct sctp_ulpevent *event = NULL; | |
1953 | struct sctp_sock *sp = sctp_sk(sk); | |
1954 | struct sk_buff *skb; | |
1955 | int copied; | |
1956 | int err = 0; | |
1957 | int skb_len; | |
1958 | ||
1959 | SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: " | |
1960 | "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg, | |
1961 | "len", len, "knoblauch", noblock, | |
1962 | "flags", flags, "addr_len", addr_len); | |
1963 | ||
1964 | sctp_lock_sock(sk); | |
1965 | ||
1966 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
1967 | err = -ENOTCONN; | |
1968 | goto out; | |
1969 | } | |
1970 | ||
1971 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
1972 | if (!skb) | |
1973 | goto out; | |
1974 | ||
1975 | /* Get the total length of the skb including any skb's in the | |
1976 | * frag_list. | |
1977 | */ | |
1978 | skb_len = skb->len; | |
1979 | ||
1980 | copied = skb_len; | |
1981 | if (copied > len) | |
1982 | copied = len; | |
1983 | ||
1984 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
1985 | ||
1986 | event = sctp_skb2event(skb); | |
1987 | ||
1988 | if (err) | |
1989 | goto out_free; | |
1990 | ||
3b885787 | 1991 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
1992 | if (sctp_ulpevent_is_notification(event)) { |
1993 | msg->msg_flags |= MSG_NOTIFICATION; | |
1994 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
1995 | } else { | |
1996 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
1997 | } | |
1998 | ||
1999 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
2000 | if (sp->subscribe.sctp_data_io_event) | |
2001 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
2002 | #if 0 | |
2003 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
2004 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
2005 | ip_cmsg_recv(msg, skb); | |
2006 | #endif | |
2007 | ||
2008 | err = copied; | |
2009 | ||
2010 | /* If skb's length exceeds the user's buffer, update the skb and | |
2011 | * push it back to the receive_queue so that the next call to | |
2012 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2013 | */ | |
2014 | if (skb_len > copied) { | |
2015 | msg->msg_flags &= ~MSG_EOR; | |
2016 | if (flags & MSG_PEEK) | |
2017 | goto out_free; | |
2018 | sctp_skb_pull(skb, copied); | |
2019 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2020 | ||
2021 | /* When only partial message is copied to the user, increase | |
2022 | * rwnd by that amount. If all the data in the skb is read, | |
2023 | * rwnd is updated when the event is freed. | |
2024 | */ | |
0eca8fee VY |
2025 | if (!sctp_ulpevent_is_notification(event)) |
2026 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2027 | goto out; |
2028 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2029 | (event->msg_flags & MSG_EOR)) | |
2030 | msg->msg_flags |= MSG_EOR; | |
2031 | else | |
2032 | msg->msg_flags &= ~MSG_EOR; | |
2033 | ||
2034 | out_free: | |
2035 | if (flags & MSG_PEEK) { | |
2036 | /* Release the skb reference acquired after peeking the skb in | |
2037 | * sctp_skb_recv_datagram(). | |
2038 | */ | |
2039 | kfree_skb(skb); | |
2040 | } else { | |
2041 | /* Free the event which includes releasing the reference to | |
2042 | * the owner of the skb, freeing the skb and updating the | |
2043 | * rwnd. | |
2044 | */ | |
2045 | sctp_ulpevent_free(event); | |
2046 | } | |
2047 | out: | |
2048 | sctp_release_sock(sk); | |
2049 | return err; | |
2050 | } | |
2051 | ||
2052 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2053 | * | |
2054 | * This option is a on/off flag. If enabled no SCTP message | |
2055 | * fragmentation will be performed. Instead if a message being sent | |
2056 | * exceeds the current PMTU size, the message will NOT be sent and | |
2057 | * instead a error will be indicated to the user. | |
2058 | */ | |
2059 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2060 | char __user *optval, |
2061 | unsigned int optlen) | |
1da177e4 LT |
2062 | { |
2063 | int val; | |
2064 | ||
2065 | if (optlen < sizeof(int)) | |
2066 | return -EINVAL; | |
2067 | ||
2068 | if (get_user(val, (int __user *)optval)) | |
2069 | return -EFAULT; | |
2070 | ||
2071 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2072 | ||
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2077 | unsigned int optlen) |
1da177e4 | 2078 | { |
94912301 WY |
2079 | struct sctp_association *asoc; |
2080 | struct sctp_ulpevent *event; | |
2081 | ||
7e8616d8 | 2082 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2083 | return -EINVAL; |
2084 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2085 | return -EFAULT; | |
94912301 WY |
2086 | |
2087 | /* | |
2088 | * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT, | |
2089 | * if there is no data to be sent or retransmit, the stack will | |
2090 | * immediately send up this notification. | |
2091 | */ | |
2092 | if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT, | |
2093 | &sctp_sk(sk)->subscribe)) { | |
2094 | asoc = sctp_id2assoc(sk, 0); | |
2095 | ||
2096 | if (asoc && sctp_outq_is_empty(&asoc->outqueue)) { | |
2097 | event = sctp_ulpevent_make_sender_dry_event(asoc, | |
2098 | GFP_ATOMIC); | |
2099 | if (!event) | |
2100 | return -ENOMEM; | |
2101 | ||
2102 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
2103 | } | |
2104 | } | |
2105 | ||
1da177e4 LT |
2106 | return 0; |
2107 | } | |
2108 | ||
2109 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2110 | * | |
2111 | * This socket option is applicable to the UDP-style socket only. When | |
2112 | * set it will cause associations that are idle for more than the | |
2113 | * specified number of seconds to automatically close. An association | |
2114 | * being idle is defined an association that has NOT sent or received | |
2115 | * user data. The special value of '0' indicates that no automatic | |
2116 | * close of any associations should be performed. The option expects an | |
2117 | * integer defining the number of seconds of idle time before an | |
2118 | * association is closed. | |
2119 | */ | |
2120 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2121 | unsigned int optlen) |
1da177e4 LT |
2122 | { |
2123 | struct sctp_sock *sp = sctp_sk(sk); | |
2124 | ||
2125 | /* Applicable to UDP-style socket only */ | |
2126 | if (sctp_style(sk, TCP)) | |
2127 | return -EOPNOTSUPP; | |
2128 | if (optlen != sizeof(int)) | |
2129 | return -EINVAL; | |
2130 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2131 | return -EFAULT; | |
f6778aab | 2132 | /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */ |
8ffd3208 | 2133 | sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ); |
1da177e4 | 2134 | |
1da177e4 LT |
2135 | return 0; |
2136 | } | |
2137 | ||
2138 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2139 | * | |
2140 | * Applications can enable or disable heartbeats for any peer address of | |
2141 | * an association, modify an address's heartbeat interval, force a | |
2142 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2143 | * number of retransmissions sent before an address is considered | |
2144 | * unreachable. The following structure is used to access and modify an | |
2145 | * address's parameters: | |
2146 | * | |
2147 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2148 | * sctp_assoc_t spp_assoc_id; |
2149 | * struct sockaddr_storage spp_address; | |
2150 | * uint32_t spp_hbinterval; | |
2151 | * uint16_t spp_pathmaxrxt; | |
2152 | * uint32_t spp_pathmtu; | |
2153 | * uint32_t spp_sackdelay; | |
2154 | * uint32_t spp_flags; | |
2155 | * }; | |
2156 | * | |
2157 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2158 | * application, and identifies the association for | |
2159 | * this query. | |
1da177e4 LT |
2160 | * spp_address - This specifies which address is of interest. |
2161 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2162 | * in milliseconds. If a value of zero |
2163 | * is present in this field then no changes are to | |
2164 | * be made to this parameter. | |
1da177e4 LT |
2165 | * spp_pathmaxrxt - This contains the maximum number of |
2166 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2167 | * considered unreachable. If a value of zero |
2168 | * is present in this field then no changes are to | |
2169 | * be made to this parameter. | |
2170 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2171 | * specified here will be the "fixed" path mtu. | |
2172 | * Note that if the spp_address field is empty | |
2173 | * then all associations on this address will | |
2174 | * have this fixed path mtu set upon them. | |
2175 | * | |
2176 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2177 | * the number of milliseconds that sacks will be delayed | |
2178 | * for. This value will apply to all addresses of an | |
2179 | * association if the spp_address field is empty. Note | |
2180 | * also, that if delayed sack is enabled and this | |
2181 | * value is set to 0, no change is made to the last | |
2182 | * recorded delayed sack timer value. | |
2183 | * | |
2184 | * spp_flags - These flags are used to control various features | |
2185 | * on an association. The flag field may contain | |
2186 | * zero or more of the following options. | |
2187 | * | |
2188 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2189 | * specified address. Note that if the address | |
2190 | * field is empty all addresses for the association | |
2191 | * have heartbeats enabled upon them. | |
2192 | * | |
2193 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2194 | * speicifed address. Note that if the address | |
2195 | * field is empty all addresses for the association | |
2196 | * will have their heartbeats disabled. Note also | |
2197 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2198 | * mutually exclusive, only one of these two should | |
2199 | * be specified. Enabling both fields will have | |
2200 | * undetermined results. | |
2201 | * | |
2202 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2203 | * to be made immediately. | |
2204 | * | |
bdf3092a VY |
2205 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2206 | * heartbeat delayis to be set to the value of 0 | |
2207 | * milliseconds. | |
2208 | * | |
52ccb8e9 FF |
2209 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2210 | * discovery upon the specified address. Note that | |
2211 | * if the address feild is empty then all addresses | |
2212 | * on the association are effected. | |
2213 | * | |
2214 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2215 | * discovery upon the specified address. Note that | |
2216 | * if the address feild is empty then all addresses | |
2217 | * on the association are effected. Not also that | |
2218 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2219 | * exclusive. Enabling both will have undetermined | |
2220 | * results. | |
2221 | * | |
2222 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2223 | * on delayed sack. The time specified in spp_sackdelay | |
2224 | * is used to specify the sack delay for this address. Note | |
2225 | * that if spp_address is empty then all addresses will | |
2226 | * enable delayed sack and take on the sack delay | |
2227 | * value specified in spp_sackdelay. | |
2228 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2229 | * off delayed sack. If the spp_address field is blank then | |
2230 | * delayed sack is disabled for the entire association. Note | |
2231 | * also that this field is mutually exclusive to | |
2232 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2233 | * results. | |
1da177e4 | 2234 | */ |
16164366 AB |
2235 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2236 | struct sctp_transport *trans, | |
2237 | struct sctp_association *asoc, | |
2238 | struct sctp_sock *sp, | |
2239 | int hb_change, | |
2240 | int pmtud_change, | |
2241 | int sackdelay_change) | |
52ccb8e9 FF |
2242 | { |
2243 | int error; | |
2244 | ||
2245 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
2246 | error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans); | |
2247 | if (error) | |
2248 | return error; | |
2249 | } | |
2250 | ||
bdf3092a VY |
2251 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2252 | * this field is ignored. Note also that a value of zero indicates | |
2253 | * the current setting should be left unchanged. | |
2254 | */ | |
2255 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2256 | ||
2257 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2258 | * set. This lets us use 0 value when this flag | |
2259 | * is set. | |
2260 | */ | |
2261 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2262 | params->spp_hbinterval = 0; | |
2263 | ||
2264 | if (params->spp_hbinterval || | |
2265 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2266 | if (trans) { | |
2267 | trans->hbinterval = | |
2268 | msecs_to_jiffies(params->spp_hbinterval); | |
2269 | } else if (asoc) { | |
2270 | asoc->hbinterval = | |
2271 | msecs_to_jiffies(params->spp_hbinterval); | |
2272 | } else { | |
2273 | sp->hbinterval = params->spp_hbinterval; | |
2274 | } | |
52ccb8e9 FF |
2275 | } |
2276 | } | |
2277 | ||
2278 | if (hb_change) { | |
2279 | if (trans) { | |
2280 | trans->param_flags = | |
2281 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2282 | } else if (asoc) { | |
2283 | asoc->param_flags = | |
2284 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2285 | } else { | |
2286 | sp->param_flags = | |
2287 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2288 | } | |
2289 | } | |
2290 | ||
bdf3092a VY |
2291 | /* When Path MTU discovery is disabled the value specified here will |
2292 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2293 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2294 | * effect). | |
2295 | */ | |
2296 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2297 | if (trans) { |
2298 | trans->pathmtu = params->spp_pathmtu; | |
2299 | sctp_assoc_sync_pmtu(asoc); | |
2300 | } else if (asoc) { | |
2301 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2302 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2303 | } else { |
2304 | sp->pathmtu = params->spp_pathmtu; | |
2305 | } | |
2306 | } | |
2307 | ||
2308 | if (pmtud_change) { | |
2309 | if (trans) { | |
2310 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2311 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2312 | trans->param_flags = | |
2313 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2314 | if (update) { | |
9914ae3c | 2315 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
52ccb8e9 FF |
2316 | sctp_assoc_sync_pmtu(asoc); |
2317 | } | |
2318 | } else if (asoc) { | |
2319 | asoc->param_flags = | |
2320 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2321 | } else { | |
2322 | sp->param_flags = | |
2323 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2324 | } | |
2325 | } | |
2326 | ||
bdf3092a VY |
2327 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2328 | * value of this field is ignored. Note also that a value of zero | |
2329 | * indicates the current setting should be left unchanged. | |
2330 | */ | |
2331 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2332 | if (trans) { |
2333 | trans->sackdelay = | |
2334 | msecs_to_jiffies(params->spp_sackdelay); | |
2335 | } else if (asoc) { | |
2336 | asoc->sackdelay = | |
2337 | msecs_to_jiffies(params->spp_sackdelay); | |
2338 | } else { | |
2339 | sp->sackdelay = params->spp_sackdelay; | |
2340 | } | |
2341 | } | |
2342 | ||
2343 | if (sackdelay_change) { | |
2344 | if (trans) { | |
2345 | trans->param_flags = | |
2346 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2347 | sackdelay_change; | |
2348 | } else if (asoc) { | |
2349 | asoc->param_flags = | |
2350 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2351 | sackdelay_change; | |
2352 | } else { | |
2353 | sp->param_flags = | |
2354 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2355 | sackdelay_change; | |
2356 | } | |
2357 | } | |
2358 | ||
37051f73 APO |
2359 | /* Note that a value of zero indicates the current setting should be |
2360 | left unchanged. | |
bdf3092a | 2361 | */ |
37051f73 | 2362 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2363 | if (trans) { |
2364 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2365 | } else if (asoc) { | |
2366 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2367 | } else { | |
2368 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | return 0; | |
2373 | } | |
2374 | ||
1da177e4 | 2375 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2376 | char __user *optval, |
2377 | unsigned int optlen) | |
1da177e4 | 2378 | { |
52ccb8e9 FF |
2379 | struct sctp_paddrparams params; |
2380 | struct sctp_transport *trans = NULL; | |
2381 | struct sctp_association *asoc = NULL; | |
2382 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2383 | int error; |
52ccb8e9 | 2384 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2385 | |
2386 | if (optlen != sizeof(struct sctp_paddrparams)) | |
52ccb8e9 FF |
2387 | return - EINVAL; |
2388 | ||
1da177e4 LT |
2389 | if (copy_from_user(¶ms, optval, optlen)) |
2390 | return -EFAULT; | |
2391 | ||
52ccb8e9 FF |
2392 | /* Validate flags and value parameters. */ |
2393 | hb_change = params.spp_flags & SPP_HB; | |
2394 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2395 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2396 | ||
2397 | if (hb_change == SPP_HB || | |
2398 | pmtud_change == SPP_PMTUD || | |
2399 | sackdelay_change == SPP_SACKDELAY || | |
2400 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2401 | (params.spp_pathmtu && |
2402 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2403 | return -EINVAL; |
1da177e4 | 2404 | |
52ccb8e9 FF |
2405 | /* If an address other than INADDR_ANY is specified, and |
2406 | * no transport is found, then the request is invalid. | |
2407 | */ | |
52cae8f0 | 2408 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2409 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2410 | params.spp_assoc_id); | |
2411 | if (!trans) | |
1da177e4 | 2412 | return -EINVAL; |
1da177e4 LT |
2413 | } |
2414 | ||
52ccb8e9 FF |
2415 | /* Get association, if assoc_id != 0 and the socket is a one |
2416 | * to many style socket, and an association was not found, then | |
2417 | * the id was invalid. | |
2418 | */ | |
2419 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2420 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2421 | return -EINVAL; |
2422 | ||
52ccb8e9 FF |
2423 | /* Heartbeat demand can only be sent on a transport or |
2424 | * association, but not a socket. | |
1da177e4 | 2425 | */ |
52ccb8e9 FF |
2426 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2427 | return -EINVAL; | |
2428 | ||
2429 | /* Process parameters. */ | |
2430 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2431 | hb_change, pmtud_change, | |
2432 | sackdelay_change); | |
1da177e4 | 2433 | |
52ccb8e9 FF |
2434 | if (error) |
2435 | return error; | |
2436 | ||
2437 | /* If changes are for association, also apply parameters to each | |
2438 | * transport. | |
1da177e4 | 2439 | */ |
52ccb8e9 | 2440 | if (!trans && asoc) { |
9dbc15f0 RD |
2441 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2442 | transports) { | |
52ccb8e9 FF |
2443 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2444 | hb_change, pmtud_change, | |
2445 | sackdelay_change); | |
2446 | } | |
2447 | } | |
1da177e4 LT |
2448 | |
2449 | return 0; | |
2450 | } | |
2451 | ||
d364d927 WY |
2452 | /* |
2453 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2454 | * | |
2455 | * This option will effect the way delayed acks are performed. This | |
2456 | * option allows you to get or set the delayed ack time, in | |
2457 | * milliseconds. It also allows changing the delayed ack frequency. | |
2458 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2459 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2460 | * values. If the assoc_id field is non-zero, then the set or get | |
2461 | * effects the specified association for the one to many model (the | |
2462 | * assoc_id field is ignored by the one to one model). Note that if | |
2463 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2464 | * current values will remain unchanged. | |
2465 | * | |
2466 | * struct sctp_sack_info { | |
2467 | * sctp_assoc_t sack_assoc_id; | |
2468 | * uint32_t sack_delay; | |
2469 | * uint32_t sack_freq; | |
2470 | * }; | |
2471 | * | |
2472 | * sack_assoc_id - This parameter, indicates which association the user | |
2473 | * is performing an action upon. Note that if this field's value is | |
2474 | * zero then the endpoints default value is changed (effecting future | |
2475 | * associations only). | |
2476 | * | |
2477 | * sack_delay - This parameter contains the number of milliseconds that | |
2478 | * the user is requesting the delayed ACK timer be set to. Note that | |
2479 | * this value is defined in the standard to be between 200 and 500 | |
2480 | * milliseconds. | |
2481 | * | |
2482 | * sack_freq - This parameter contains the number of packets that must | |
2483 | * be received before a sack is sent without waiting for the delay | |
2484 | * timer to expire. The default value for this is 2, setting this | |
2485 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2486 | */ |
2487 | ||
d364d927 | 2488 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2489 | char __user *optval, unsigned int optlen) |
7708610b | 2490 | { |
d364d927 | 2491 | struct sctp_sack_info params; |
7708610b FF |
2492 | struct sctp_transport *trans = NULL; |
2493 | struct sctp_association *asoc = NULL; | |
2494 | struct sctp_sock *sp = sctp_sk(sk); | |
2495 | ||
d364d927 WY |
2496 | if (optlen == sizeof(struct sctp_sack_info)) { |
2497 | if (copy_from_user(¶ms, optval, optlen)) | |
2498 | return -EFAULT; | |
7708610b | 2499 | |
d364d927 WY |
2500 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2501 | return 0; | |
2502 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
2503 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
2504 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
2505 | if (copy_from_user(¶ms, optval, optlen)) |
2506 | return -EFAULT; | |
2507 | ||
2508 | if (params.sack_delay == 0) | |
2509 | params.sack_freq = 1; | |
2510 | else | |
2511 | params.sack_freq = 0; | |
2512 | } else | |
2513 | return - EINVAL; | |
7708610b FF |
2514 | |
2515 | /* Validate value parameter. */ | |
d364d927 | 2516 | if (params.sack_delay > 500) |
7708610b FF |
2517 | return -EINVAL; |
2518 | ||
d364d927 | 2519 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2520 | * to many style socket, and an association was not found, then |
2521 | * the id was invalid. | |
d808ad9a | 2522 | */ |
d364d927 WY |
2523 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2524 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2525 | return -EINVAL; |
2526 | ||
d364d927 | 2527 | if (params.sack_delay) { |
7708610b FF |
2528 | if (asoc) { |
2529 | asoc->sackdelay = | |
d364d927 | 2530 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2531 | asoc->param_flags = |
7708610b FF |
2532 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2533 | SPP_SACKDELAY_ENABLE; | |
2534 | } else { | |
d364d927 | 2535 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2536 | sp->param_flags = |
7708610b FF |
2537 | (sp->param_flags & ~SPP_SACKDELAY) | |
2538 | SPP_SACKDELAY_ENABLE; | |
2539 | } | |
d364d927 WY |
2540 | } |
2541 | ||
2542 | if (params.sack_freq == 1) { | |
7708610b | 2543 | if (asoc) { |
d808ad9a | 2544 | asoc->param_flags = |
7708610b FF |
2545 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2546 | SPP_SACKDELAY_DISABLE; | |
2547 | } else { | |
d808ad9a | 2548 | sp->param_flags = |
7708610b FF |
2549 | (sp->param_flags & ~SPP_SACKDELAY) | |
2550 | SPP_SACKDELAY_DISABLE; | |
2551 | } | |
d364d927 WY |
2552 | } else if (params.sack_freq > 1) { |
2553 | if (asoc) { | |
2554 | asoc->sackfreq = params.sack_freq; | |
2555 | asoc->param_flags = | |
2556 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2557 | SPP_SACKDELAY_ENABLE; | |
2558 | } else { | |
2559 | sp->sackfreq = params.sack_freq; | |
2560 | sp->param_flags = | |
2561 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2562 | SPP_SACKDELAY_ENABLE; | |
2563 | } | |
7708610b FF |
2564 | } |
2565 | ||
2566 | /* If change is for association, also apply to each transport. */ | |
2567 | if (asoc) { | |
9dbc15f0 RD |
2568 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2569 | transports) { | |
d364d927 | 2570 | if (params.sack_delay) { |
7708610b | 2571 | trans->sackdelay = |
d364d927 | 2572 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2573 | trans->param_flags = |
7708610b FF |
2574 | (trans->param_flags & ~SPP_SACKDELAY) | |
2575 | SPP_SACKDELAY_ENABLE; | |
d364d927 | 2576 | } |
7bfe8bdb | 2577 | if (params.sack_freq == 1) { |
d808ad9a | 2578 | trans->param_flags = |
7708610b FF |
2579 | (trans->param_flags & ~SPP_SACKDELAY) | |
2580 | SPP_SACKDELAY_DISABLE; | |
d364d927 WY |
2581 | } else if (params.sack_freq > 1) { |
2582 | trans->sackfreq = params.sack_freq; | |
2583 | trans->param_flags = | |
2584 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2585 | SPP_SACKDELAY_ENABLE; | |
7708610b FF |
2586 | } |
2587 | } | |
2588 | } | |
d808ad9a | 2589 | |
7708610b FF |
2590 | return 0; |
2591 | } | |
2592 | ||
1da177e4 LT |
2593 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2594 | * | |
2595 | * Applications can specify protocol parameters for the default association | |
2596 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2597 | * is SCTP_INITMSG. | |
2598 | * | |
2599 | * Setting initialization parameters is effective only on an unconnected | |
2600 | * socket (for UDP-style sockets only future associations are effected | |
2601 | * by the change). With TCP-style sockets, this option is inherited by | |
2602 | * sockets derived from a listener socket. | |
2603 | */ | |
b7058842 | 2604 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2605 | { |
2606 | struct sctp_initmsg sinit; | |
2607 | struct sctp_sock *sp = sctp_sk(sk); | |
2608 | ||
2609 | if (optlen != sizeof(struct sctp_initmsg)) | |
2610 | return -EINVAL; | |
2611 | if (copy_from_user(&sinit, optval, optlen)) | |
2612 | return -EFAULT; | |
2613 | ||
2614 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2615 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2616 | if (sinit.sinit_max_instreams) |
d808ad9a | 2617 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2618 | if (sinit.sinit_max_attempts) |
d808ad9a | 2619 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2620 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2621 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2622 | |
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | /* | |
2627 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2628 | * | |
2629 | * Applications that wish to use the sendto() system call may wish to | |
2630 | * specify a default set of parameters that would normally be supplied | |
2631 | * through the inclusion of ancillary data. This socket option allows | |
2632 | * such an application to set the default sctp_sndrcvinfo structure. | |
2633 | * The application that wishes to use this socket option simply passes | |
2634 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2635 | * 5.2.2) The input parameters accepted by this call include | |
2636 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2637 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2638 | * to this call if the caller is using the UDP model. | |
2639 | */ | |
2640 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2641 | char __user *optval, |
2642 | unsigned int optlen) | |
1da177e4 LT |
2643 | { |
2644 | struct sctp_sndrcvinfo info; | |
2645 | struct sctp_association *asoc; | |
2646 | struct sctp_sock *sp = sctp_sk(sk); | |
2647 | ||
2648 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2649 | return -EINVAL; | |
2650 | if (copy_from_user(&info, optval, optlen)) | |
2651 | return -EFAULT; | |
2652 | ||
2653 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2654 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2655 | return -EINVAL; | |
2656 | ||
2657 | if (asoc) { | |
2658 | asoc->default_stream = info.sinfo_stream; | |
2659 | asoc->default_flags = info.sinfo_flags; | |
2660 | asoc->default_ppid = info.sinfo_ppid; | |
2661 | asoc->default_context = info.sinfo_context; | |
2662 | asoc->default_timetolive = info.sinfo_timetolive; | |
2663 | } else { | |
2664 | sp->default_stream = info.sinfo_stream; | |
2665 | sp->default_flags = info.sinfo_flags; | |
2666 | sp->default_ppid = info.sinfo_ppid; | |
2667 | sp->default_context = info.sinfo_context; | |
2668 | sp->default_timetolive = info.sinfo_timetolive; | |
2669 | } | |
2670 | ||
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2675 | * | |
2676 | * Requests that the local SCTP stack use the enclosed peer address as | |
2677 | * the association primary. The enclosed address must be one of the | |
2678 | * association peer's addresses. | |
2679 | */ | |
2680 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2681 | unsigned int optlen) |
1da177e4 LT |
2682 | { |
2683 | struct sctp_prim prim; | |
2684 | struct sctp_transport *trans; | |
2685 | ||
2686 | if (optlen != sizeof(struct sctp_prim)) | |
2687 | return -EINVAL; | |
2688 | ||
2689 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2690 | return -EFAULT; | |
2691 | ||
2692 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2693 | if (!trans) | |
2694 | return -EINVAL; | |
2695 | ||
2696 | sctp_assoc_set_primary(trans->asoc, trans); | |
2697 | ||
2698 | return 0; | |
2699 | } | |
2700 | ||
2701 | /* | |
2702 | * 7.1.5 SCTP_NODELAY | |
2703 | * | |
2704 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2705 | * generally sent as soon as possible and no unnecessary delays are | |
2706 | * introduced, at the cost of more packets in the network. Expects an | |
2707 | * integer boolean flag. | |
2708 | */ | |
2709 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2710 | unsigned int optlen) |
1da177e4 LT |
2711 | { |
2712 | int val; | |
2713 | ||
2714 | if (optlen < sizeof(int)) | |
2715 | return -EINVAL; | |
2716 | if (get_user(val, (int __user *)optval)) | |
2717 | return -EFAULT; | |
2718 | ||
2719 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2720 | return 0; | |
2721 | } | |
2722 | ||
2723 | /* | |
2724 | * | |
2725 | * 7.1.1 SCTP_RTOINFO | |
2726 | * | |
2727 | * The protocol parameters used to initialize and bound retransmission | |
2728 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2729 | * and modify these parameters. | |
2730 | * All parameters are time values, in milliseconds. A value of 0, when | |
2731 | * modifying the parameters, indicates that the current value should not | |
2732 | * be changed. | |
2733 | * | |
2734 | */ | |
b7058842 DM |
2735 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2736 | { | |
1da177e4 LT |
2737 | struct sctp_rtoinfo rtoinfo; |
2738 | struct sctp_association *asoc; | |
2739 | ||
2740 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2741 | return -EINVAL; | |
2742 | ||
2743 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2744 | return -EFAULT; | |
2745 | ||
2746 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2747 | ||
2748 | /* Set the values to the specific association */ | |
2749 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2750 | return -EINVAL; | |
2751 | ||
2752 | if (asoc) { | |
2753 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2754 | asoc->rto_initial = |
1da177e4 LT |
2755 | msecs_to_jiffies(rtoinfo.srto_initial); |
2756 | if (rtoinfo.srto_max != 0) | |
2757 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2758 | if (rtoinfo.srto_min != 0) | |
2759 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2760 | } else { | |
2761 | /* If there is no association or the association-id = 0 | |
2762 | * set the values to the endpoint. | |
2763 | */ | |
2764 | struct sctp_sock *sp = sctp_sk(sk); | |
2765 | ||
2766 | if (rtoinfo.srto_initial != 0) | |
2767 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2768 | if (rtoinfo.srto_max != 0) | |
2769 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2770 | if (rtoinfo.srto_min != 0) | |
2771 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2772 | } | |
2773 | ||
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | /* | |
2778 | * | |
2779 | * 7.1.2 SCTP_ASSOCINFO | |
2780 | * | |
59c51591 | 2781 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2782 | * of the association. |
2783 | * Returns an error if the new association retransmission value is | |
2784 | * greater than the sum of the retransmission value of the peer. | |
2785 | * See [SCTP] for more information. | |
2786 | * | |
2787 | */ | |
b7058842 | 2788 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2789 | { |
2790 | ||
2791 | struct sctp_assocparams assocparams; | |
2792 | struct sctp_association *asoc; | |
2793 | ||
2794 | if (optlen != sizeof(struct sctp_assocparams)) | |
2795 | return -EINVAL; | |
2796 | if (copy_from_user(&assocparams, optval, optlen)) | |
2797 | return -EFAULT; | |
2798 | ||
2799 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2800 | ||
2801 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2802 | return -EINVAL; | |
2803 | ||
2804 | /* Set the values to the specific association */ | |
2805 | if (asoc) { | |
402d68c4 VY |
2806 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2807 | __u32 path_sum = 0; | |
2808 | int paths = 0; | |
402d68c4 VY |
2809 | struct sctp_transport *peer_addr; |
2810 | ||
9dbc15f0 RD |
2811 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2812 | transports) { | |
402d68c4 VY |
2813 | path_sum += peer_addr->pathmaxrxt; |
2814 | paths++; | |
2815 | } | |
2816 | ||
025dfdaf | 2817 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2818 | * one path/transport. We do this because path |
2819 | * retransmissions are only counted when we have more | |
2820 | * then one path. | |
2821 | */ | |
2822 | if (paths > 1 && | |
2823 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2824 | return -EINVAL; | |
2825 | ||
1da177e4 | 2826 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2827 | } |
2828 | ||
1da177e4 LT |
2829 | if (assocparams.sasoc_cookie_life != 0) { |
2830 | asoc->cookie_life.tv_sec = | |
2831 | assocparams.sasoc_cookie_life / 1000; | |
2832 | asoc->cookie_life.tv_usec = | |
2833 | (assocparams.sasoc_cookie_life % 1000) | |
2834 | * 1000; | |
2835 | } | |
2836 | } else { | |
2837 | /* Set the values to the endpoint */ | |
2838 | struct sctp_sock *sp = sctp_sk(sk); | |
2839 | ||
2840 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2841 | sp->assocparams.sasoc_asocmaxrxt = | |
2842 | assocparams.sasoc_asocmaxrxt; | |
2843 | if (assocparams.sasoc_cookie_life != 0) | |
2844 | sp->assocparams.sasoc_cookie_life = | |
2845 | assocparams.sasoc_cookie_life; | |
2846 | } | |
2847 | return 0; | |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2852 | * | |
2853 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2854 | * addresses. If this option is turned on and the socket is type | |
2855 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2856 | * If this option is turned off, then no mapping will be done of V4 | |
2857 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2858 | * addresses on the socket. | |
2859 | */ | |
b7058842 | 2860 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2861 | { |
2862 | int val; | |
2863 | struct sctp_sock *sp = sctp_sk(sk); | |
2864 | ||
2865 | if (optlen < sizeof(int)) | |
2866 | return -EINVAL; | |
2867 | if (get_user(val, (int __user *)optval)) | |
2868 | return -EFAULT; | |
2869 | if (val) | |
2870 | sp->v4mapped = 1; | |
2871 | else | |
2872 | sp->v4mapped = 0; | |
2873 | ||
2874 | return 0; | |
2875 | } | |
2876 | ||
2877 | /* | |
e89c2095 WY |
2878 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2879 | * This option will get or set the maximum size to put in any outgoing | |
2880 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
2881 | * fragmented by SCTP into the specified size. Note that the underlying |
2882 | * SCTP implementation may fragment into smaller sized chunks when the | |
2883 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
2884 | * the user. The default value for this option is '0' which indicates |
2885 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2886 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2887 | * than the maximum size of an IP datagram will effectively let SCTP | |
2888 | * control fragmentation (i.e. the same as setting this option to 0). | |
2889 | * | |
2890 | * The following structure is used to access and modify this parameter: | |
2891 | * | |
2892 | * struct sctp_assoc_value { | |
2893 | * sctp_assoc_t assoc_id; | |
2894 | * uint32_t assoc_value; | |
2895 | * }; | |
2896 | * | |
2897 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2898 | * For one-to-many style sockets this parameter indicates which | |
2899 | * association the user is performing an action upon. Note that if | |
2900 | * this field's value is zero then the endpoints default value is | |
2901 | * changed (effecting future associations only). | |
2902 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 2903 | */ |
b7058842 | 2904 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 2905 | { |
e89c2095 | 2906 | struct sctp_assoc_value params; |
1da177e4 | 2907 | struct sctp_association *asoc; |
1da177e4 LT |
2908 | struct sctp_sock *sp = sctp_sk(sk); |
2909 | int val; | |
2910 | ||
e89c2095 | 2911 | if (optlen == sizeof(int)) { |
145ce502 JP |
2912 | pr_warn("Use of int in maxseg socket option deprecated\n"); |
2913 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
e89c2095 WY |
2914 | if (copy_from_user(&val, optval, optlen)) |
2915 | return -EFAULT; | |
2916 | params.assoc_id = 0; | |
2917 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2918 | if (copy_from_user(¶ms, optval, optlen)) | |
2919 | return -EFAULT; | |
2920 | val = params.assoc_value; | |
2921 | } else | |
1da177e4 | 2922 | return -EINVAL; |
e89c2095 | 2923 | |
96a33998 | 2924 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 2925 | return -EINVAL; |
1da177e4 | 2926 | |
e89c2095 WY |
2927 | asoc = sctp_id2assoc(sk, params.assoc_id); |
2928 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
2929 | return -EINVAL; | |
2930 | ||
2931 | if (asoc) { | |
2932 | if (val == 0) { | |
2933 | val = asoc->pathmtu; | |
2934 | val -= sp->pf->af->net_header_len; | |
2935 | val -= sizeof(struct sctphdr) + | |
2936 | sizeof(struct sctp_data_chunk); | |
2937 | } | |
f68b2e05 VY |
2938 | asoc->user_frag = val; |
2939 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
2940 | } else { |
2941 | sp->user_frag = val; | |
1da177e4 LT |
2942 | } |
2943 | ||
2944 | return 0; | |
2945 | } | |
2946 | ||
2947 | ||
2948 | /* | |
2949 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
2950 | * | |
2951 | * Requests that the peer mark the enclosed address as the association | |
2952 | * primary. The enclosed address must be one of the association's | |
2953 | * locally bound addresses. The following structure is used to make a | |
2954 | * set primary request: | |
2955 | */ | |
2956 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2957 | unsigned int optlen) |
1da177e4 LT |
2958 | { |
2959 | struct sctp_sock *sp; | |
1da177e4 LT |
2960 | struct sctp_association *asoc = NULL; |
2961 | struct sctp_setpeerprim prim; | |
2962 | struct sctp_chunk *chunk; | |
40a01039 | 2963 | struct sctp_af *af; |
1da177e4 LT |
2964 | int err; |
2965 | ||
2966 | sp = sctp_sk(sk); | |
1da177e4 LT |
2967 | |
2968 | if (!sctp_addip_enable) | |
2969 | return -EPERM; | |
2970 | ||
2971 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
2972 | return -EINVAL; | |
2973 | ||
2974 | if (copy_from_user(&prim, optval, optlen)) | |
2975 | return -EFAULT; | |
2976 | ||
2977 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 2978 | if (!asoc) |
1da177e4 LT |
2979 | return -EINVAL; |
2980 | ||
2981 | if (!asoc->peer.asconf_capable) | |
2982 | return -EPERM; | |
2983 | ||
2984 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
2985 | return -EPERM; | |
2986 | ||
2987 | if (!sctp_state(asoc, ESTABLISHED)) | |
2988 | return -ENOTCONN; | |
2989 | ||
40a01039 WY |
2990 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
2991 | if (!af) | |
2992 | return -EINVAL; | |
2993 | ||
2994 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
2995 | return -EADDRNOTAVAIL; | |
2996 | ||
1da177e4 LT |
2997 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
2998 | return -EADDRNOTAVAIL; | |
2999 | ||
3000 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3001 | chunk = sctp_make_asconf_set_prim(asoc, | |
3002 | (union sctp_addr *)&prim.sspp_addr); | |
3003 | if (!chunk) | |
3004 | return -ENOMEM; | |
3005 | ||
3006 | err = sctp_send_asconf(asoc, chunk); | |
3007 | ||
3008 | SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n"); | |
3009 | ||
3010 | return err; | |
3011 | } | |
3012 | ||
0f3fffd8 | 3013 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3014 | unsigned int optlen) |
1da177e4 | 3015 | { |
0f3fffd8 | 3016 | struct sctp_setadaptation adaptation; |
1da177e4 | 3017 | |
0f3fffd8 | 3018 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3019 | return -EINVAL; |
0f3fffd8 | 3020 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3021 | return -EFAULT; |
3022 | ||
0f3fffd8 | 3023 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3024 | |
3025 | return 0; | |
3026 | } | |
3027 | ||
6ab792f5 ISJ |
3028 | /* |
3029 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3030 | * | |
3031 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3032 | * used when a failed message is retrieved holding the value that was | |
3033 | * sent down on the actual send call. This option allows the setting of | |
3034 | * a default context on an association basis that will be received on | |
3035 | * reading messages from the peer. This is especially helpful in the | |
3036 | * one-2-many model for an application to keep some reference to an | |
3037 | * internal state machine that is processing messages on the | |
3038 | * association. Note that the setting of this value only effects | |
3039 | * received messages from the peer and does not effect the value that is | |
3040 | * saved with outbound messages. | |
3041 | */ | |
3042 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3043 | unsigned int optlen) |
6ab792f5 ISJ |
3044 | { |
3045 | struct sctp_assoc_value params; | |
3046 | struct sctp_sock *sp; | |
3047 | struct sctp_association *asoc; | |
3048 | ||
3049 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3050 | return -EINVAL; | |
3051 | if (copy_from_user(¶ms, optval, optlen)) | |
3052 | return -EFAULT; | |
3053 | ||
3054 | sp = sctp_sk(sk); | |
3055 | ||
3056 | if (params.assoc_id != 0) { | |
3057 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3058 | if (!asoc) | |
3059 | return -EINVAL; | |
3060 | asoc->default_rcv_context = params.assoc_value; | |
3061 | } else { | |
3062 | sp->default_rcv_context = params.assoc_value; | |
3063 | } | |
3064 | ||
3065 | return 0; | |
3066 | } | |
3067 | ||
b6e1331f VY |
3068 | /* |
3069 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3070 | * | |
3071 | * This options will at a minimum specify if the implementation is doing | |
3072 | * fragmented interleave. Fragmented interleave, for a one to many | |
3073 | * socket, is when subsequent calls to receive a message may return | |
3074 | * parts of messages from different associations. Some implementations | |
3075 | * may allow you to turn this value on or off. If so, when turned off, | |
3076 | * no fragment interleave will occur (which will cause a head of line | |
3077 | * blocking amongst multiple associations sharing the same one to many | |
3078 | * socket). When this option is turned on, then each receive call may | |
3079 | * come from a different association (thus the user must receive data | |
3080 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3081 | * association each receive belongs to. | |
3082 | * | |
3083 | * This option takes a boolean value. A non-zero value indicates that | |
3084 | * fragmented interleave is on. A value of zero indicates that | |
3085 | * fragmented interleave is off. | |
3086 | * | |
3087 | * Note that it is important that an implementation that allows this | |
3088 | * option to be turned on, have it off by default. Otherwise an unaware | |
3089 | * application using the one to many model may become confused and act | |
3090 | * incorrectly. | |
3091 | */ | |
3092 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3093 | char __user *optval, | |
b7058842 | 3094 | unsigned int optlen) |
b6e1331f VY |
3095 | { |
3096 | int val; | |
3097 | ||
3098 | if (optlen != sizeof(int)) | |
3099 | return -EINVAL; | |
3100 | if (get_user(val, (int __user *)optval)) | |
3101 | return -EFAULT; | |
3102 | ||
3103 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3104 | ||
3105 | return 0; | |
3106 | } | |
3107 | ||
d49d91d7 | 3108 | /* |
8510b937 | 3109 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3110 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3111 | * |
d49d91d7 VY |
3112 | * This option will set or get the SCTP partial delivery point. This |
3113 | * point is the size of a message where the partial delivery API will be | |
3114 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3115 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3116 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3117 | * point. Note also that the call will fail if the user attempts to set |
3118 | * this value larger than the socket receive buffer size. | |
3119 | * | |
3120 | * Note that any single message having a length smaller than or equal to | |
3121 | * the SCTP partial delivery point will be delivered in one single read | |
3122 | * call as long as the user provided buffer is large enough to hold the | |
3123 | * message. | |
d49d91d7 VY |
3124 | */ |
3125 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3126 | char __user *optval, | |
b7058842 | 3127 | unsigned int optlen) |
d49d91d7 VY |
3128 | { |
3129 | u32 val; | |
3130 | ||
3131 | if (optlen != sizeof(u32)) | |
3132 | return -EINVAL; | |
3133 | if (get_user(val, (int __user *)optval)) | |
3134 | return -EFAULT; | |
3135 | ||
8510b937 WY |
3136 | /* Note: We double the receive buffer from what the user sets |
3137 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3138 | */ | |
3139 | if (val > (sk->sk_rcvbuf >> 1)) | |
3140 | return -EINVAL; | |
3141 | ||
d49d91d7 VY |
3142 | sctp_sk(sk)->pd_point = val; |
3143 | ||
3144 | return 0; /* is this the right error code? */ | |
3145 | } | |
3146 | ||
70331571 VY |
3147 | /* |
3148 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3149 | * | |
3150 | * This option will allow a user to change the maximum burst of packets | |
3151 | * that can be emitted by this association. Note that the default value | |
3152 | * is 4, and some implementations may restrict this setting so that it | |
3153 | * can only be lowered. | |
3154 | * | |
3155 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3156 | * future associations inheriting the socket value. | |
3157 | */ | |
3158 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3159 | char __user *optval, | |
b7058842 | 3160 | unsigned int optlen) |
70331571 | 3161 | { |
219b99a9 NH |
3162 | struct sctp_assoc_value params; |
3163 | struct sctp_sock *sp; | |
3164 | struct sctp_association *asoc; | |
70331571 | 3165 | int val; |
219b99a9 | 3166 | int assoc_id = 0; |
70331571 | 3167 | |
219b99a9 | 3168 | if (optlen == sizeof(int)) { |
145ce502 JP |
3169 | pr_warn("Use of int in max_burst socket option deprecated\n"); |
3170 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
219b99a9 NH |
3171 | if (copy_from_user(&val, optval, optlen)) |
3172 | return -EFAULT; | |
3173 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3174 | if (copy_from_user(¶ms, optval, optlen)) | |
3175 | return -EFAULT; | |
3176 | val = params.assoc_value; | |
3177 | assoc_id = params.assoc_id; | |
3178 | } else | |
70331571 VY |
3179 | return -EINVAL; |
3180 | ||
219b99a9 NH |
3181 | sp = sctp_sk(sk); |
3182 | ||
3183 | if (assoc_id != 0) { | |
3184 | asoc = sctp_id2assoc(sk, assoc_id); | |
3185 | if (!asoc) | |
3186 | return -EINVAL; | |
3187 | asoc->max_burst = val; | |
3188 | } else | |
3189 | sp->max_burst = val; | |
70331571 VY |
3190 | |
3191 | return 0; | |
3192 | } | |
3193 | ||
65b07e5d VY |
3194 | /* |
3195 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3196 | * | |
3197 | * This set option adds a chunk type that the user is requesting to be | |
3198 | * received only in an authenticated way. Changes to the list of chunks | |
3199 | * will only effect future associations on the socket. | |
3200 | */ | |
3201 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3202 | char __user *optval, |
3203 | unsigned int optlen) | |
65b07e5d VY |
3204 | { |
3205 | struct sctp_authchunk val; | |
3206 | ||
5e739d17 VY |
3207 | if (!sctp_auth_enable) |
3208 | return -EACCES; | |
3209 | ||
65b07e5d VY |
3210 | if (optlen != sizeof(struct sctp_authchunk)) |
3211 | return -EINVAL; | |
3212 | if (copy_from_user(&val, optval, optlen)) | |
3213 | return -EFAULT; | |
3214 | ||
3215 | switch (val.sauth_chunk) { | |
3216 | case SCTP_CID_INIT: | |
3217 | case SCTP_CID_INIT_ACK: | |
3218 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3219 | case SCTP_CID_AUTH: | |
3220 | return -EINVAL; | |
3221 | } | |
3222 | ||
3223 | /* add this chunk id to the endpoint */ | |
3224 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3225 | } | |
3226 | ||
3227 | /* | |
3228 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3229 | * | |
3230 | * This option gets or sets the list of HMAC algorithms that the local | |
3231 | * endpoint requires the peer to use. | |
3232 | */ | |
3233 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3234 | char __user *optval, |
3235 | unsigned int optlen) | |
65b07e5d VY |
3236 | { |
3237 | struct sctp_hmacalgo *hmacs; | |
d9724055 | 3238 | u32 idents; |
65b07e5d VY |
3239 | int err; |
3240 | ||
5e739d17 VY |
3241 | if (!sctp_auth_enable) |
3242 | return -EACCES; | |
3243 | ||
65b07e5d VY |
3244 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3245 | return -EINVAL; | |
3246 | ||
934253a7 SW |
3247 | hmacs= memdup_user(optval, optlen); |
3248 | if (IS_ERR(hmacs)) | |
3249 | return PTR_ERR(hmacs); | |
65b07e5d | 3250 | |
d9724055 VY |
3251 | idents = hmacs->shmac_num_idents; |
3252 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3253 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3254 | err = -EINVAL; |
3255 | goto out; | |
3256 | } | |
3257 | ||
3258 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3259 | out: | |
3260 | kfree(hmacs); | |
3261 | return err; | |
3262 | } | |
3263 | ||
3264 | /* | |
3265 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3266 | * | |
3267 | * This option will set a shared secret key which is used to build an | |
3268 | * association shared key. | |
3269 | */ | |
3270 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3271 | char __user *optval, | |
b7058842 | 3272 | unsigned int optlen) |
65b07e5d VY |
3273 | { |
3274 | struct sctp_authkey *authkey; | |
3275 | struct sctp_association *asoc; | |
3276 | int ret; | |
3277 | ||
5e739d17 VY |
3278 | if (!sctp_auth_enable) |
3279 | return -EACCES; | |
3280 | ||
65b07e5d VY |
3281 | if (optlen <= sizeof(struct sctp_authkey)) |
3282 | return -EINVAL; | |
3283 | ||
934253a7 SW |
3284 | authkey= memdup_user(optval, optlen); |
3285 | if (IS_ERR(authkey)) | |
3286 | return PTR_ERR(authkey); | |
65b07e5d | 3287 | |
328fc47e | 3288 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3289 | ret = -EINVAL; |
3290 | goto out; | |
3291 | } | |
3292 | ||
65b07e5d VY |
3293 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3294 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3295 | ret = -EINVAL; | |
3296 | goto out; | |
3297 | } | |
3298 | ||
3299 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3300 | out: | |
3301 | kfree(authkey); | |
3302 | return ret; | |
3303 | } | |
3304 | ||
3305 | /* | |
3306 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3307 | * | |
3308 | * This option will get or set the active shared key to be used to build | |
3309 | * the association shared key. | |
3310 | */ | |
3311 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3312 | char __user *optval, |
3313 | unsigned int optlen) | |
65b07e5d VY |
3314 | { |
3315 | struct sctp_authkeyid val; | |
3316 | struct sctp_association *asoc; | |
3317 | ||
5e739d17 VY |
3318 | if (!sctp_auth_enable) |
3319 | return -EACCES; | |
3320 | ||
65b07e5d VY |
3321 | if (optlen != sizeof(struct sctp_authkeyid)) |
3322 | return -EINVAL; | |
3323 | if (copy_from_user(&val, optval, optlen)) | |
3324 | return -EFAULT; | |
3325 | ||
3326 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3327 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3328 | return -EINVAL; | |
3329 | ||
3330 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3331 | val.scact_keynumber); | |
3332 | } | |
3333 | ||
3334 | /* | |
3335 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3336 | * | |
3337 | * This set option will delete a shared secret key from use. | |
3338 | */ | |
3339 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3340 | char __user *optval, |
3341 | unsigned int optlen) | |
65b07e5d VY |
3342 | { |
3343 | struct sctp_authkeyid val; | |
3344 | struct sctp_association *asoc; | |
3345 | ||
5e739d17 VY |
3346 | if (!sctp_auth_enable) |
3347 | return -EACCES; | |
3348 | ||
65b07e5d VY |
3349 | if (optlen != sizeof(struct sctp_authkeyid)) |
3350 | return -EINVAL; | |
3351 | if (copy_from_user(&val, optval, optlen)) | |
3352 | return -EFAULT; | |
3353 | ||
3354 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3355 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3356 | return -EINVAL; | |
3357 | ||
3358 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3359 | val.scact_keynumber); | |
3360 | ||
3361 | } | |
3362 | ||
3363 | ||
1da177e4 LT |
3364 | /* API 6.2 setsockopt(), getsockopt() |
3365 | * | |
3366 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3367 | * socket options. Socket options are used to change the default | |
3368 | * behavior of sockets calls. They are described in Section 7. | |
3369 | * | |
3370 | * The syntax is: | |
3371 | * | |
3372 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3373 | * int __user *optlen); | |
3374 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3375 | * int optlen); | |
3376 | * | |
3377 | * sd - the socket descript. | |
3378 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3379 | * optname - the option name. | |
3380 | * optval - the buffer to store the value of the option. | |
3381 | * optlen - the size of the buffer. | |
3382 | */ | |
3383 | SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 3384 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
3385 | { |
3386 | int retval = 0; | |
3387 | ||
3388 | SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n", | |
3389 | sk, optname); | |
3390 | ||
3391 | /* I can hardly begin to describe how wrong this is. This is | |
3392 | * so broken as to be worse than useless. The API draft | |
3393 | * REALLY is NOT helpful here... I am not convinced that the | |
3394 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3395 | * are at all well-founded. | |
3396 | */ | |
3397 | if (level != SOL_SCTP) { | |
3398 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3399 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3400 | goto out_nounlock; | |
3401 | } | |
3402 | ||
3403 | sctp_lock_sock(sk); | |
3404 | ||
3405 | switch (optname) { | |
3406 | case SCTP_SOCKOPT_BINDX_ADD: | |
3407 | /* 'optlen' is the size of the addresses buffer. */ | |
3408 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3409 | optlen, SCTP_BINDX_ADD_ADDR); | |
3410 | break; | |
3411 | ||
3412 | case SCTP_SOCKOPT_BINDX_REM: | |
3413 | /* 'optlen' is the size of the addresses buffer. */ | |
3414 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3415 | optlen, SCTP_BINDX_REM_ADDR); | |
3416 | break; | |
3417 | ||
88a0a948 VY |
3418 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3419 | /* 'optlen' is the size of the addresses buffer. */ | |
3420 | retval = sctp_setsockopt_connectx_old(sk, | |
3421 | (struct sockaddr __user *)optval, | |
3422 | optlen); | |
3423 | break; | |
3424 | ||
3f7a87d2 FF |
3425 | case SCTP_SOCKOPT_CONNECTX: |
3426 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3427 | retval = sctp_setsockopt_connectx(sk, |
3428 | (struct sockaddr __user *)optval, | |
3429 | optlen); | |
3f7a87d2 FF |
3430 | break; |
3431 | ||
1da177e4 LT |
3432 | case SCTP_DISABLE_FRAGMENTS: |
3433 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3434 | break; | |
3435 | ||
3436 | case SCTP_EVENTS: | |
3437 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3438 | break; | |
3439 | ||
3440 | case SCTP_AUTOCLOSE: | |
3441 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3442 | break; | |
3443 | ||
3444 | case SCTP_PEER_ADDR_PARAMS: | |
3445 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3446 | break; | |
3447 | ||
4580ccc0 | 3448 | case SCTP_DELAYED_SACK: |
d364d927 | 3449 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3450 | break; |
d49d91d7 VY |
3451 | case SCTP_PARTIAL_DELIVERY_POINT: |
3452 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3453 | break; | |
7708610b | 3454 | |
1da177e4 LT |
3455 | case SCTP_INITMSG: |
3456 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3457 | break; | |
3458 | case SCTP_DEFAULT_SEND_PARAM: | |
3459 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3460 | optlen); | |
3461 | break; | |
3462 | case SCTP_PRIMARY_ADDR: | |
3463 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3464 | break; | |
3465 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3466 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3467 | break; | |
3468 | case SCTP_NODELAY: | |
3469 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3470 | break; | |
3471 | case SCTP_RTOINFO: | |
3472 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3473 | break; | |
3474 | case SCTP_ASSOCINFO: | |
3475 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3476 | break; | |
3477 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3478 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3479 | break; | |
3480 | case SCTP_MAXSEG: | |
3481 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3482 | break; | |
0f3fffd8 ISJ |
3483 | case SCTP_ADAPTATION_LAYER: |
3484 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3485 | break; |
6ab792f5 ISJ |
3486 | case SCTP_CONTEXT: |
3487 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3488 | break; | |
b6e1331f VY |
3489 | case SCTP_FRAGMENT_INTERLEAVE: |
3490 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3491 | break; | |
70331571 VY |
3492 | case SCTP_MAX_BURST: |
3493 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3494 | break; | |
65b07e5d VY |
3495 | case SCTP_AUTH_CHUNK: |
3496 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3497 | break; | |
3498 | case SCTP_HMAC_IDENT: | |
3499 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3500 | break; | |
3501 | case SCTP_AUTH_KEY: | |
3502 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3503 | break; | |
3504 | case SCTP_AUTH_ACTIVE_KEY: | |
3505 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3506 | break; | |
3507 | case SCTP_AUTH_DELETE_KEY: | |
3508 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3509 | break; | |
1da177e4 LT |
3510 | default: |
3511 | retval = -ENOPROTOOPT; | |
3512 | break; | |
3ff50b79 | 3513 | } |
1da177e4 LT |
3514 | |
3515 | sctp_release_sock(sk); | |
3516 | ||
3517 | out_nounlock: | |
3518 | return retval; | |
3519 | } | |
3520 | ||
3521 | /* API 3.1.6 connect() - UDP Style Syntax | |
3522 | * | |
3523 | * An application may use the connect() call in the UDP model to initiate an | |
3524 | * association without sending data. | |
3525 | * | |
3526 | * The syntax is: | |
3527 | * | |
3528 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3529 | * | |
3530 | * sd: the socket descriptor to have a new association added to. | |
3531 | * | |
3532 | * nam: the address structure (either struct sockaddr_in or struct | |
3533 | * sockaddr_in6 defined in RFC2553 [7]). | |
3534 | * | |
3535 | * len: the size of the address. | |
3536 | */ | |
3f7a87d2 | 3537 | SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr, |
1da177e4 LT |
3538 | int addr_len) |
3539 | { | |
1da177e4 | 3540 | int err = 0; |
3f7a87d2 | 3541 | struct sctp_af *af; |
1da177e4 LT |
3542 | |
3543 | sctp_lock_sock(sk); | |
3544 | ||
3f7a87d2 | 3545 | SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n", |
0dc47877 | 3546 | __func__, sk, addr, addr_len); |
1da177e4 | 3547 | |
3f7a87d2 FF |
3548 | /* Validate addr_len before calling common connect/connectx routine. */ |
3549 | af = sctp_get_af_specific(addr->sa_family); | |
3550 | if (!af || addr_len < af->sockaddr_len) { | |
3551 | err = -EINVAL; | |
3552 | } else { | |
3553 | /* Pass correct addr len to common routine (so it knows there | |
3554 | * is only one address being passed. | |
3555 | */ | |
88a0a948 | 3556 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3557 | } |
3558 | ||
1da177e4 | 3559 | sctp_release_sock(sk); |
1da177e4 LT |
3560 | return err; |
3561 | } | |
3562 | ||
3563 | /* FIXME: Write comments. */ | |
3564 | SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags) | |
3565 | { | |
3566 | return -EOPNOTSUPP; /* STUB */ | |
3567 | } | |
3568 | ||
3569 | /* 4.1.4 accept() - TCP Style Syntax | |
3570 | * | |
3571 | * Applications use accept() call to remove an established SCTP | |
3572 | * association from the accept queue of the endpoint. A new socket | |
3573 | * descriptor will be returned from accept() to represent the newly | |
3574 | * formed association. | |
3575 | */ | |
3576 | SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err) | |
3577 | { | |
3578 | struct sctp_sock *sp; | |
3579 | struct sctp_endpoint *ep; | |
3580 | struct sock *newsk = NULL; | |
3581 | struct sctp_association *asoc; | |
3582 | long timeo; | |
3583 | int error = 0; | |
3584 | ||
3585 | sctp_lock_sock(sk); | |
3586 | ||
3587 | sp = sctp_sk(sk); | |
3588 | ep = sp->ep; | |
3589 | ||
3590 | if (!sctp_style(sk, TCP)) { | |
3591 | error = -EOPNOTSUPP; | |
3592 | goto out; | |
3593 | } | |
3594 | ||
3595 | if (!sctp_sstate(sk, LISTENING)) { | |
3596 | error = -EINVAL; | |
3597 | goto out; | |
3598 | } | |
3599 | ||
8abfedd8 | 3600 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3601 | |
3602 | error = sctp_wait_for_accept(sk, timeo); | |
3603 | if (error) | |
3604 | goto out; | |
3605 | ||
3606 | /* We treat the list of associations on the endpoint as the accept | |
3607 | * queue and pick the first association on the list. | |
3608 | */ | |
3609 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3610 | ||
3611 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3612 | if (!newsk) { | |
3613 | error = -ENOMEM; | |
3614 | goto out; | |
3615 | } | |
3616 | ||
3617 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3618 | * asoc to the newsk. | |
3619 | */ | |
3620 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3621 | ||
3622 | out: | |
3623 | sctp_release_sock(sk); | |
d808ad9a | 3624 | *err = error; |
1da177e4 LT |
3625 | return newsk; |
3626 | } | |
3627 | ||
3628 | /* The SCTP ioctl handler. */ | |
3629 | SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
3630 | { | |
65040c33 DEFP |
3631 | int rc = -ENOTCONN; |
3632 | ||
3633 | sctp_lock_sock(sk); | |
3634 | ||
3635 | /* | |
3636 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3637 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3638 | */ | |
3639 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3640 | goto out; | |
3641 | ||
3642 | switch (cmd) { | |
3643 | case SIOCINQ: { | |
3644 | struct sk_buff *skb; | |
3645 | unsigned int amount = 0; | |
3646 | ||
3647 | skb = skb_peek(&sk->sk_receive_queue); | |
3648 | if (skb != NULL) { | |
3649 | /* | |
3650 | * We will only return the amount of this packet since | |
3651 | * that is all that will be read. | |
3652 | */ | |
3653 | amount = skb->len; | |
3654 | } | |
3655 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3656 | break; |
9a7241c2 | 3657 | } |
65040c33 DEFP |
3658 | default: |
3659 | rc = -ENOIOCTLCMD; | |
3660 | break; | |
3661 | } | |
3662 | out: | |
3663 | sctp_release_sock(sk); | |
3664 | return rc; | |
1da177e4 LT |
3665 | } |
3666 | ||
3667 | /* This is the function which gets called during socket creation to | |
3668 | * initialized the SCTP-specific portion of the sock. | |
3669 | * The sock structure should already be zero-filled memory. | |
3670 | */ | |
3671 | SCTP_STATIC int sctp_init_sock(struct sock *sk) | |
3672 | { | |
3673 | struct sctp_endpoint *ep; | |
3674 | struct sctp_sock *sp; | |
3675 | ||
3676 | SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk); | |
3677 | ||
3678 | sp = sctp_sk(sk); | |
3679 | ||
3680 | /* Initialize the SCTP per socket area. */ | |
3681 | switch (sk->sk_type) { | |
3682 | case SOCK_SEQPACKET: | |
3683 | sp->type = SCTP_SOCKET_UDP; | |
3684 | break; | |
3685 | case SOCK_STREAM: | |
3686 | sp->type = SCTP_SOCKET_TCP; | |
3687 | break; | |
3688 | default: | |
3689 | return -ESOCKTNOSUPPORT; | |
3690 | } | |
3691 | ||
3692 | /* Initialize default send parameters. These parameters can be | |
3693 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3694 | */ | |
3695 | sp->default_stream = 0; | |
3696 | sp->default_ppid = 0; | |
3697 | sp->default_flags = 0; | |
3698 | sp->default_context = 0; | |
3699 | sp->default_timetolive = 0; | |
3700 | ||
6ab792f5 | 3701 | sp->default_rcv_context = 0; |
70331571 | 3702 | sp->max_burst = sctp_max_burst; |
6ab792f5 | 3703 | |
1da177e4 LT |
3704 | /* Initialize default setup parameters. These parameters |
3705 | * can be modified with the SCTP_INITMSG socket option or | |
3706 | * overridden by the SCTP_INIT CMSG. | |
3707 | */ | |
3708 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3709 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
3710 | sp->initmsg.sinit_max_attempts = sctp_max_retrans_init; | |
3fd091e7 | 3711 | sp->initmsg.sinit_max_init_timeo = sctp_rto_max; |
1da177e4 LT |
3712 | |
3713 | /* Initialize default RTO related parameters. These parameters can | |
3714 | * be modified for with the SCTP_RTOINFO socket option. | |
3715 | */ | |
3fd091e7 VY |
3716 | sp->rtoinfo.srto_initial = sctp_rto_initial; |
3717 | sp->rtoinfo.srto_max = sctp_rto_max; | |
3718 | sp->rtoinfo.srto_min = sctp_rto_min; | |
1da177e4 LT |
3719 | |
3720 | /* Initialize default association related parameters. These parameters | |
3721 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3722 | */ | |
3723 | sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association; | |
3724 | sp->assocparams.sasoc_number_peer_destinations = 0; | |
3725 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3726 | sp->assocparams.sasoc_local_rwnd = 0; | |
3fd091e7 | 3727 | sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life; |
1da177e4 LT |
3728 | |
3729 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 3730 | * options are off. |
1da177e4 LT |
3731 | */ |
3732 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3733 | ||
3734 | /* Default Peer Address Parameters. These defaults can | |
3735 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3736 | */ | |
3fd091e7 | 3737 | sp->hbinterval = sctp_hb_interval; |
52ccb8e9 FF |
3738 | sp->pathmaxrxt = sctp_max_retrans_path; |
3739 | sp->pathmtu = 0; // allow default discovery | |
3fd091e7 | 3740 | sp->sackdelay = sctp_sack_timeout; |
7bfe8bdb | 3741 | sp->sackfreq = 2; |
52ccb8e9 | 3742 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
3743 | SPP_PMTUD_ENABLE | |
3744 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
3745 | |
3746 | /* If enabled no SCTP message fragmentation will be performed. | |
3747 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3748 | */ | |
3749 | sp->disable_fragments = 0; | |
3750 | ||
208edef6 SS |
3751 | /* Enable Nagle algorithm by default. */ |
3752 | sp->nodelay = 0; | |
1da177e4 LT |
3753 | |
3754 | /* Enable by default. */ | |
3755 | sp->v4mapped = 1; | |
3756 | ||
3757 | /* Auto-close idle associations after the configured | |
3758 | * number of seconds. A value of 0 disables this | |
3759 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3760 | * for UDP-style sockets only. | |
3761 | */ | |
3762 | sp->autoclose = 0; | |
3763 | ||
3764 | /* User specified fragmentation limit. */ | |
3765 | sp->user_frag = 0; | |
3766 | ||
0f3fffd8 | 3767 | sp->adaptation_ind = 0; |
1da177e4 LT |
3768 | |
3769 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3770 | ||
3771 | /* Control variables for partial data delivery. */ | |
b6e1331f | 3772 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 3773 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 3774 | sp->frag_interleave = 0; |
1da177e4 LT |
3775 | |
3776 | /* Create a per socket endpoint structure. Even if we | |
3777 | * change the data structure relationships, this may still | |
3778 | * be useful for storing pre-connect address information. | |
3779 | */ | |
3780 | ep = sctp_endpoint_new(sk, GFP_KERNEL); | |
3781 | if (!ep) | |
3782 | return -ENOMEM; | |
3783 | ||
3784 | sp->ep = ep; | |
3785 | sp->hmac = NULL; | |
3786 | ||
3787 | SCTP_DBG_OBJCNT_INC(sock); | |
6f756a8c DM |
3788 | |
3789 | local_bh_disable(); | |
81419d86 | 3790 | percpu_counter_inc(&sctp_sockets_allocated); |
9a57f7fa | 3791 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
6f756a8c DM |
3792 | local_bh_enable(); |
3793 | ||
1da177e4 LT |
3794 | return 0; |
3795 | } | |
3796 | ||
3797 | /* Cleanup any SCTP per socket resources. */ | |
7d06b2e0 | 3798 | SCTP_STATIC void sctp_destroy_sock(struct sock *sk) |
1da177e4 LT |
3799 | { |
3800 | struct sctp_endpoint *ep; | |
3801 | ||
3802 | SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk); | |
3803 | ||
3804 | /* Release our hold on the endpoint. */ | |
3805 | ep = sctp_sk(sk)->ep; | |
3806 | sctp_endpoint_free(ep); | |
5bc0b3bf | 3807 | local_bh_disable(); |
81419d86 | 3808 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 3809 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 3810 | local_bh_enable(); |
1da177e4 LT |
3811 | } |
3812 | ||
3813 | /* API 4.1.7 shutdown() - TCP Style Syntax | |
3814 | * int shutdown(int socket, int how); | |
3815 | * | |
3816 | * sd - the socket descriptor of the association to be closed. | |
3817 | * how - Specifies the type of shutdown. The values are | |
3818 | * as follows: | |
3819 | * SHUT_RD | |
3820 | * Disables further receive operations. No SCTP | |
3821 | * protocol action is taken. | |
3822 | * SHUT_WR | |
3823 | * Disables further send operations, and initiates | |
3824 | * the SCTP shutdown sequence. | |
3825 | * SHUT_RDWR | |
3826 | * Disables further send and receive operations | |
3827 | * and initiates the SCTP shutdown sequence. | |
3828 | */ | |
3829 | SCTP_STATIC void sctp_shutdown(struct sock *sk, int how) | |
3830 | { | |
3831 | struct sctp_endpoint *ep; | |
3832 | struct sctp_association *asoc; | |
3833 | ||
3834 | if (!sctp_style(sk, TCP)) | |
3835 | return; | |
3836 | ||
3837 | if (how & SEND_SHUTDOWN) { | |
3838 | ep = sctp_sk(sk)->ep; | |
3839 | if (!list_empty(&ep->asocs)) { | |
3840 | asoc = list_entry(ep->asocs.next, | |
3841 | struct sctp_association, asocs); | |
3842 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
3843 | } | |
3844 | } | |
3845 | } | |
3846 | ||
3847 | /* 7.2.1 Association Status (SCTP_STATUS) | |
3848 | ||
3849 | * Applications can retrieve current status information about an | |
3850 | * association, including association state, peer receiver window size, | |
3851 | * number of unacked data chunks, and number of data chunks pending | |
3852 | * receipt. This information is read-only. | |
3853 | */ | |
3854 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
3855 | char __user *optval, | |
3856 | int __user *optlen) | |
3857 | { | |
3858 | struct sctp_status status; | |
3859 | struct sctp_association *asoc = NULL; | |
3860 | struct sctp_transport *transport; | |
3861 | sctp_assoc_t associd; | |
3862 | int retval = 0; | |
3863 | ||
408f22e8 | 3864 | if (len < sizeof(status)) { |
1da177e4 LT |
3865 | retval = -EINVAL; |
3866 | goto out; | |
3867 | } | |
3868 | ||
408f22e8 NH |
3869 | len = sizeof(status); |
3870 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
3871 | retval = -EFAULT; |
3872 | goto out; | |
3873 | } | |
3874 | ||
3875 | associd = status.sstat_assoc_id; | |
3876 | asoc = sctp_id2assoc(sk, associd); | |
3877 | if (!asoc) { | |
3878 | retval = -EINVAL; | |
3879 | goto out; | |
3880 | } | |
3881 | ||
3882 | transport = asoc->peer.primary_path; | |
3883 | ||
3884 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
3885 | status.sstat_state = asoc->state; | |
3886 | status.sstat_rwnd = asoc->peer.rwnd; | |
3887 | status.sstat_unackdata = asoc->unack_data; | |
3888 | ||
3889 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
3890 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
3891 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
3892 | status.sstat_fragmentation_point = asoc->frag_point; | |
3893 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
3894 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
3895 | transport->af_specific->sockaddr_len); | |
1da177e4 LT |
3896 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
3897 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
3898 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3f7a87d2 | 3899 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
3900 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
3901 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
3902 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 3903 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 3904 | |
3f7a87d2 FF |
3905 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
3906 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
3907 | ||
1da177e4 LT |
3908 | if (put_user(len, optlen)) { |
3909 | retval = -EFAULT; | |
3910 | goto out; | |
3911 | } | |
3912 | ||
3913 | SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n", | |
3914 | len, status.sstat_state, status.sstat_rwnd, | |
3915 | status.sstat_assoc_id); | |
3916 | ||
3917 | if (copy_to_user(optval, &status, len)) { | |
3918 | retval = -EFAULT; | |
3919 | goto out; | |
3920 | } | |
3921 | ||
3922 | out: | |
a02cec21 | 3923 | return retval; |
1da177e4 LT |
3924 | } |
3925 | ||
3926 | ||
3927 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
3928 | * | |
3929 | * Applications can retrieve information about a specific peer address | |
3930 | * of an association, including its reachability state, congestion | |
3931 | * window, and retransmission timer values. This information is | |
3932 | * read-only. | |
3933 | */ | |
3934 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
3935 | char __user *optval, | |
3936 | int __user *optlen) | |
3937 | { | |
3938 | struct sctp_paddrinfo pinfo; | |
3939 | struct sctp_transport *transport; | |
3940 | int retval = 0; | |
3941 | ||
408f22e8 | 3942 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
3943 | retval = -EINVAL; |
3944 | goto out; | |
3945 | } | |
3946 | ||
408f22e8 NH |
3947 | len = sizeof(pinfo); |
3948 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
3949 | retval = -EFAULT; |
3950 | goto out; | |
3951 | } | |
3952 | ||
3953 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
3954 | pinfo.spinfo_assoc_id); | |
3955 | if (!transport) | |
3956 | return -EINVAL; | |
3957 | ||
3958 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 3959 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
3960 | pinfo.spinfo_cwnd = transport->cwnd; |
3961 | pinfo.spinfo_srtt = transport->srtt; | |
3962 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 3963 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 3964 | |
3f7a87d2 FF |
3965 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
3966 | pinfo.spinfo_state = SCTP_ACTIVE; | |
3967 | ||
1da177e4 LT |
3968 | if (put_user(len, optlen)) { |
3969 | retval = -EFAULT; | |
3970 | goto out; | |
3971 | } | |
3972 | ||
3973 | if (copy_to_user(optval, &pinfo, len)) { | |
3974 | retval = -EFAULT; | |
3975 | goto out; | |
3976 | } | |
3977 | ||
3978 | out: | |
a02cec21 | 3979 | return retval; |
1da177e4 LT |
3980 | } |
3981 | ||
3982 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
3983 | * | |
3984 | * This option is a on/off flag. If enabled no SCTP message | |
3985 | * fragmentation will be performed. Instead if a message being sent | |
3986 | * exceeds the current PMTU size, the message will NOT be sent and | |
3987 | * instead a error will be indicated to the user. | |
3988 | */ | |
3989 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
3990 | char __user *optval, int __user *optlen) | |
3991 | { | |
3992 | int val; | |
3993 | ||
3994 | if (len < sizeof(int)) | |
3995 | return -EINVAL; | |
3996 | ||
3997 | len = sizeof(int); | |
3998 | val = (sctp_sk(sk)->disable_fragments == 1); | |
3999 | if (put_user(len, optlen)) | |
4000 | return -EFAULT; | |
4001 | if (copy_to_user(optval, &val, len)) | |
4002 | return -EFAULT; | |
4003 | return 0; | |
4004 | } | |
4005 | ||
4006 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4007 | * | |
4008 | * This socket option is used to specify various notifications and | |
4009 | * ancillary data the user wishes to receive. | |
4010 | */ | |
4011 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4012 | int __user *optlen) | |
4013 | { | |
408f22e8 | 4014 | if (len < sizeof(struct sctp_event_subscribe)) |
1da177e4 | 4015 | return -EINVAL; |
408f22e8 NH |
4016 | len = sizeof(struct sctp_event_subscribe); |
4017 | if (put_user(len, optlen)) | |
4018 | return -EFAULT; | |
1da177e4 LT |
4019 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4020 | return -EFAULT; | |
4021 | return 0; | |
4022 | } | |
4023 | ||
4024 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4025 | * | |
4026 | * This socket option is applicable to the UDP-style socket only. When | |
4027 | * set it will cause associations that are idle for more than the | |
4028 | * specified number of seconds to automatically close. An association | |
4029 | * being idle is defined an association that has NOT sent or received | |
4030 | * user data. The special value of '0' indicates that no automatic | |
4031 | * close of any associations should be performed. The option expects an | |
4032 | * integer defining the number of seconds of idle time before an | |
4033 | * association is closed. | |
4034 | */ | |
4035 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4036 | { | |
4037 | /* Applicable to UDP-style socket only */ | |
4038 | if (sctp_style(sk, TCP)) | |
4039 | return -EOPNOTSUPP; | |
408f22e8 | 4040 | if (len < sizeof(int)) |
1da177e4 | 4041 | return -EINVAL; |
408f22e8 NH |
4042 | len = sizeof(int); |
4043 | if (put_user(len, optlen)) | |
4044 | return -EFAULT; | |
4045 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4046 | return -EFAULT; |
4047 | return 0; | |
4048 | } | |
4049 | ||
4050 | /* Helper routine to branch off an association to a new socket. */ | |
4051 | SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc, | |
4052 | struct socket **sockp) | |
4053 | { | |
4054 | struct sock *sk = asoc->base.sk; | |
4055 | struct socket *sock; | |
d570ee49 | 4056 | struct sctp_af *af; |
1da177e4 LT |
4057 | int err = 0; |
4058 | ||
4059 | /* An association cannot be branched off from an already peeled-off | |
4060 | * socket, nor is this supported for tcp style sockets. | |
4061 | */ | |
4062 | if (!sctp_style(sk, UDP)) | |
4063 | return -EINVAL; | |
4064 | ||
4065 | /* Create a new socket. */ | |
4066 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4067 | if (err < 0) | |
4068 | return err; | |
4069 | ||
914e1c8b | 4070 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4071 | |
4072 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4073 | * Set the daddr and initialize id to something more random | |
4074 | */ | |
d570ee49 VY |
4075 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4076 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
914e1c8b VY |
4077 | |
4078 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4079 | * asoc to the newsk. | |
4080 | */ | |
4081 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4082 | |
1da177e4 LT |
4083 | *sockp = sock; |
4084 | ||
4085 | return err; | |
4086 | } | |
4087 | ||
4088 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4089 | { | |
4090 | sctp_peeloff_arg_t peeloff; | |
4091 | struct socket *newsock; | |
4092 | int retval = 0; | |
4093 | struct sctp_association *asoc; | |
4094 | ||
408f22e8 | 4095 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4096 | return -EINVAL; |
408f22e8 | 4097 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4098 | if (copy_from_user(&peeloff, optval, len)) |
4099 | return -EFAULT; | |
4100 | ||
4101 | asoc = sctp_id2assoc(sk, peeloff.associd); | |
4102 | if (!asoc) { | |
4103 | retval = -EINVAL; | |
4104 | goto out; | |
4105 | } | |
4106 | ||
0dc47877 | 4107 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc); |
1da177e4 LT |
4108 | |
4109 | retval = sctp_do_peeloff(asoc, &newsock); | |
4110 | if (retval < 0) | |
4111 | goto out; | |
4112 | ||
4113 | /* Map the socket to an unused fd that can be returned to the user. */ | |
a677a039 | 4114 | retval = sock_map_fd(newsock, 0); |
1da177e4 LT |
4115 | if (retval < 0) { |
4116 | sock_release(newsock); | |
4117 | goto out; | |
4118 | } | |
4119 | ||
4120 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n", | |
0dc47877 | 4121 | __func__, sk, asoc, newsock->sk, retval); |
1da177e4 LT |
4122 | |
4123 | /* Return the fd mapped to the new socket. */ | |
4124 | peeloff.sd = retval; | |
408f22e8 NH |
4125 | if (put_user(len, optlen)) |
4126 | return -EFAULT; | |
1da177e4 LT |
4127 | if (copy_to_user(optval, &peeloff, len)) |
4128 | retval = -EFAULT; | |
4129 | ||
4130 | out: | |
4131 | return retval; | |
4132 | } | |
4133 | ||
4134 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4135 | * | |
4136 | * Applications can enable or disable heartbeats for any peer address of | |
4137 | * an association, modify an address's heartbeat interval, force a | |
4138 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4139 | * number of retransmissions sent before an address is considered | |
4140 | * unreachable. The following structure is used to access and modify an | |
4141 | * address's parameters: | |
4142 | * | |
4143 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4144 | * sctp_assoc_t spp_assoc_id; |
4145 | * struct sockaddr_storage spp_address; | |
4146 | * uint32_t spp_hbinterval; | |
4147 | * uint16_t spp_pathmaxrxt; | |
4148 | * uint32_t spp_pathmtu; | |
4149 | * uint32_t spp_sackdelay; | |
4150 | * uint32_t spp_flags; | |
4151 | * }; | |
4152 | * | |
4153 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4154 | * application, and identifies the association for | |
4155 | * this query. | |
1da177e4 LT |
4156 | * spp_address - This specifies which address is of interest. |
4157 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4158 | * in milliseconds. If a value of zero |
4159 | * is present in this field then no changes are to | |
4160 | * be made to this parameter. | |
1da177e4 LT |
4161 | * spp_pathmaxrxt - This contains the maximum number of |
4162 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4163 | * considered unreachable. If a value of zero |
4164 | * is present in this field then no changes are to | |
4165 | * be made to this parameter. | |
4166 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4167 | * specified here will be the "fixed" path mtu. | |
4168 | * Note that if the spp_address field is empty | |
4169 | * then all associations on this address will | |
4170 | * have this fixed path mtu set upon them. | |
4171 | * | |
4172 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4173 | * the number of milliseconds that sacks will be delayed | |
4174 | * for. This value will apply to all addresses of an | |
4175 | * association if the spp_address field is empty. Note | |
4176 | * also, that if delayed sack is enabled and this | |
4177 | * value is set to 0, no change is made to the last | |
4178 | * recorded delayed sack timer value. | |
4179 | * | |
4180 | * spp_flags - These flags are used to control various features | |
4181 | * on an association. The flag field may contain | |
4182 | * zero or more of the following options. | |
4183 | * | |
4184 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4185 | * specified address. Note that if the address | |
4186 | * field is empty all addresses for the association | |
4187 | * have heartbeats enabled upon them. | |
4188 | * | |
4189 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4190 | * speicifed address. Note that if the address | |
4191 | * field is empty all addresses for the association | |
4192 | * will have their heartbeats disabled. Note also | |
4193 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4194 | * mutually exclusive, only one of these two should | |
4195 | * be specified. Enabling both fields will have | |
4196 | * undetermined results. | |
4197 | * | |
4198 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4199 | * to be made immediately. | |
4200 | * | |
4201 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4202 | * discovery upon the specified address. Note that | |
4203 | * if the address feild is empty then all addresses | |
4204 | * on the association are effected. | |
4205 | * | |
4206 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4207 | * discovery upon the specified address. Note that | |
4208 | * if the address feild is empty then all addresses | |
4209 | * on the association are effected. Not also that | |
4210 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4211 | * exclusive. Enabling both will have undetermined | |
4212 | * results. | |
4213 | * | |
4214 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4215 | * on delayed sack. The time specified in spp_sackdelay | |
4216 | * is used to specify the sack delay for this address. Note | |
4217 | * that if spp_address is empty then all addresses will | |
4218 | * enable delayed sack and take on the sack delay | |
4219 | * value specified in spp_sackdelay. | |
4220 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4221 | * off delayed sack. If the spp_address field is blank then | |
4222 | * delayed sack is disabled for the entire association. Note | |
4223 | * also that this field is mutually exclusive to | |
4224 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4225 | * results. | |
1da177e4 LT |
4226 | */ |
4227 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4228 | char __user *optval, int __user *optlen) |
1da177e4 | 4229 | { |
52ccb8e9 FF |
4230 | struct sctp_paddrparams params; |
4231 | struct sctp_transport *trans = NULL; | |
4232 | struct sctp_association *asoc = NULL; | |
4233 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4234 | |
408f22e8 | 4235 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4236 | return -EINVAL; |
408f22e8 | 4237 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4238 | if (copy_from_user(¶ms, optval, len)) |
4239 | return -EFAULT; | |
4240 | ||
52ccb8e9 FF |
4241 | /* If an address other than INADDR_ANY is specified, and |
4242 | * no transport is found, then the request is invalid. | |
1da177e4 | 4243 | */ |
52cae8f0 | 4244 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4245 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4246 | params.spp_assoc_id); | |
4247 | if (!trans) { | |
4248 | SCTP_DEBUG_PRINTK("Failed no transport\n"); | |
4249 | return -EINVAL; | |
4250 | } | |
1da177e4 LT |
4251 | } |
4252 | ||
52ccb8e9 FF |
4253 | /* Get association, if assoc_id != 0 and the socket is a one |
4254 | * to many style socket, and an association was not found, then | |
4255 | * the id was invalid. | |
4256 | */ | |
4257 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4258 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
4259 | SCTP_DEBUG_PRINTK("Failed no association\n"); | |
1da177e4 | 4260 | return -EINVAL; |
52ccb8e9 | 4261 | } |
1da177e4 | 4262 | |
52ccb8e9 FF |
4263 | if (trans) { |
4264 | /* Fetch transport values. */ | |
4265 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4266 | params.spp_pathmtu = trans->pathmtu; | |
4267 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4268 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4269 | ||
4270 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4271 | params.spp_flags = trans->param_flags; | |
4272 | } else if (asoc) { | |
4273 | /* Fetch association values. */ | |
4274 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4275 | params.spp_pathmtu = asoc->pathmtu; | |
4276 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4277 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4278 | ||
4279 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4280 | params.spp_flags = asoc->param_flags; | |
4281 | } else { | |
4282 | /* Fetch socket values. */ | |
4283 | params.spp_hbinterval = sp->hbinterval; | |
4284 | params.spp_pathmtu = sp->pathmtu; | |
4285 | params.spp_sackdelay = sp->sackdelay; | |
4286 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4287 | |
52ccb8e9 FF |
4288 | /*draft-11 doesn't say what to return in spp_flags*/ |
4289 | params.spp_flags = sp->param_flags; | |
4290 | } | |
1da177e4 | 4291 | |
1da177e4 LT |
4292 | if (copy_to_user(optval, ¶ms, len)) |
4293 | return -EFAULT; | |
4294 | ||
4295 | if (put_user(len, optlen)) | |
4296 | return -EFAULT; | |
4297 | ||
4298 | return 0; | |
4299 | } | |
4300 | ||
d364d927 WY |
4301 | /* |
4302 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4303 | * | |
4304 | * This option will effect the way delayed acks are performed. This | |
4305 | * option allows you to get or set the delayed ack time, in | |
4306 | * milliseconds. It also allows changing the delayed ack frequency. | |
4307 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4308 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4309 | * values. If the assoc_id field is non-zero, then the set or get | |
4310 | * effects the specified association for the one to many model (the | |
4311 | * assoc_id field is ignored by the one to one model). Note that if | |
4312 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4313 | * current values will remain unchanged. | |
4314 | * | |
4315 | * struct sctp_sack_info { | |
4316 | * sctp_assoc_t sack_assoc_id; | |
4317 | * uint32_t sack_delay; | |
4318 | * uint32_t sack_freq; | |
4319 | * }; | |
7708610b | 4320 | * |
d364d927 WY |
4321 | * sack_assoc_id - This parameter, indicates which association the user |
4322 | * is performing an action upon. Note that if this field's value is | |
4323 | * zero then the endpoints default value is changed (effecting future | |
4324 | * associations only). | |
7708610b | 4325 | * |
d364d927 WY |
4326 | * sack_delay - This parameter contains the number of milliseconds that |
4327 | * the user is requesting the delayed ACK timer be set to. Note that | |
4328 | * this value is defined in the standard to be between 200 and 500 | |
4329 | * milliseconds. | |
7708610b | 4330 | * |
d364d927 WY |
4331 | * sack_freq - This parameter contains the number of packets that must |
4332 | * be received before a sack is sent without waiting for the delay | |
4333 | * timer to expire. The default value for this is 2, setting this | |
4334 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4335 | */ |
d364d927 | 4336 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4337 | char __user *optval, |
4338 | int __user *optlen) | |
4339 | { | |
d364d927 | 4340 | struct sctp_sack_info params; |
7708610b FF |
4341 | struct sctp_association *asoc = NULL; |
4342 | struct sctp_sock *sp = sctp_sk(sk); | |
4343 | ||
d364d927 WY |
4344 | if (len >= sizeof(struct sctp_sack_info)) { |
4345 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4346 | |
d364d927 WY |
4347 | if (copy_from_user(¶ms, optval, len)) |
4348 | return -EFAULT; | |
4349 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
4350 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
4351 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
4352 | if (copy_from_user(¶ms, optval, len)) |
4353 | return -EFAULT; | |
4354 | } else | |
4355 | return - EINVAL; | |
7708610b | 4356 | |
d364d927 | 4357 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4358 | * to many style socket, and an association was not found, then |
4359 | * the id was invalid. | |
d808ad9a | 4360 | */ |
d364d927 WY |
4361 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4362 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4363 | return -EINVAL; |
4364 | ||
4365 | if (asoc) { | |
4366 | /* Fetch association values. */ | |
d364d927 WY |
4367 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4368 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4369 | asoc->sackdelay); |
d364d927 WY |
4370 | params.sack_freq = asoc->sackfreq; |
4371 | ||
4372 | } else { | |
4373 | params.sack_delay = 0; | |
4374 | params.sack_freq = 1; | |
4375 | } | |
7708610b FF |
4376 | } else { |
4377 | /* Fetch socket values. */ | |
d364d927 WY |
4378 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4379 | params.sack_delay = sp->sackdelay; | |
4380 | params.sack_freq = sp->sackfreq; | |
4381 | } else { | |
4382 | params.sack_delay = 0; | |
4383 | params.sack_freq = 1; | |
4384 | } | |
7708610b FF |
4385 | } |
4386 | ||
4387 | if (copy_to_user(optval, ¶ms, len)) | |
4388 | return -EFAULT; | |
4389 | ||
4390 | if (put_user(len, optlen)) | |
4391 | return -EFAULT; | |
4392 | ||
4393 | return 0; | |
4394 | } | |
4395 | ||
1da177e4 LT |
4396 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4397 | * | |
4398 | * Applications can specify protocol parameters for the default association | |
4399 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4400 | * is SCTP_INITMSG. | |
4401 | * | |
4402 | * Setting initialization parameters is effective only on an unconnected | |
4403 | * socket (for UDP-style sockets only future associations are effected | |
4404 | * by the change). With TCP-style sockets, this option is inherited by | |
4405 | * sockets derived from a listener socket. | |
4406 | */ | |
4407 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4408 | { | |
408f22e8 | 4409 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4410 | return -EINVAL; |
408f22e8 NH |
4411 | len = sizeof(struct sctp_initmsg); |
4412 | if (put_user(len, optlen)) | |
4413 | return -EFAULT; | |
1da177e4 LT |
4414 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4415 | return -EFAULT; | |
4416 | return 0; | |
4417 | } | |
4418 |