]>
Commit | Line | Data |
---|---|---|
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 | ||
dc022a98 SS |
586 | /* Add the new addresses to the bind address list with |
587 | * use_as_src set to 0. | |
1da177e4 | 588 | */ |
dc022a98 SS |
589 | addr_buf = addrs; |
590 | for (i = 0; i < addrcnt; i++) { | |
591 | addr = (union sctp_addr *)addr_buf; | |
592 | af = sctp_get_af_specific(addr->v4.sin_family); | |
593 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
f57d96b2 VY |
594 | retval = sctp_add_bind_addr(bp, &saveaddr, |
595 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
596 | addr_buf += af->sockaddr_len; |
597 | } | |
8a07eb0a MH |
598 | if (asoc->src_out_of_asoc_ok) { |
599 | struct sctp_transport *trans; | |
600 | ||
601 | list_for_each_entry(trans, | |
602 | &asoc->peer.transport_addr_list, transports) { | |
603 | /* Clear the source and route cache */ | |
604 | dst_release(trans->dst); | |
605 | trans->cwnd = min(4*asoc->pathmtu, max_t(__u32, | |
606 | 2*asoc->pathmtu, 4380)); | |
607 | trans->ssthresh = asoc->peer.i.a_rwnd; | |
608 | trans->rto = asoc->rto_initial; | |
609 | trans->rtt = trans->srtt = trans->rttvar = 0; | |
610 | sctp_transport_route(trans, NULL, | |
611 | sctp_sk(asoc->base.sk)); | |
612 | } | |
613 | } | |
614 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
615 | } |
616 | ||
617 | out: | |
618 | return retval; | |
619 | } | |
620 | ||
621 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
622 | * last address. | |
623 | * | |
624 | * Basically run through each address specified in the addrs/addrcnt | |
625 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
626 | * sctp_del_bind() on it. | |
627 | * | |
628 | * If any of them fails, then the operation will be reversed and the | |
629 | * ones that were removed will be added back. | |
630 | * | |
631 | * At least one address has to be left; if only one address is | |
632 | * available, the operation will return -EBUSY. | |
633 | * | |
634 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
635 | */ | |
04675210 | 636 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
637 | { |
638 | struct sctp_sock *sp = sctp_sk(sk); | |
639 | struct sctp_endpoint *ep = sp->ep; | |
640 | int cnt; | |
641 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
642 | int retval = 0; | |
1da177e4 | 643 | void *addr_buf; |
c9a08505 | 644 | union sctp_addr *sa_addr; |
1da177e4 LT |
645 | struct sctp_af *af; |
646 | ||
647 | SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n", | |
648 | sk, addrs, addrcnt); | |
649 | ||
650 | addr_buf = addrs; | |
651 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
652 | /* If the bind address list is empty or if there is only one | |
653 | * bind address, there is nothing more to be removed (we need | |
654 | * at least one address here). | |
655 | */ | |
656 | if (list_empty(&bp->address_list) || | |
657 | (sctp_list_single_entry(&bp->address_list))) { | |
658 | retval = -EBUSY; | |
659 | goto err_bindx_rem; | |
660 | } | |
661 | ||
c9a08505 AV |
662 | sa_addr = (union sctp_addr *)addr_buf; |
663 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
1da177e4 LT |
664 | if (!af) { |
665 | retval = -EINVAL; | |
666 | goto err_bindx_rem; | |
667 | } | |
0304ff8a PG |
668 | |
669 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
670 | retval = -EADDRNOTAVAIL; | |
671 | goto err_bindx_rem; | |
672 | } | |
673 | ||
ee9cbaca VY |
674 | if (sa_addr->v4.sin_port && |
675 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
676 | retval = -EINVAL; |
677 | goto err_bindx_rem; | |
678 | } | |
679 | ||
ee9cbaca VY |
680 | if (!sa_addr->v4.sin_port) |
681 | sa_addr->v4.sin_port = htons(bp->port); | |
682 | ||
1da177e4 LT |
683 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
684 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
685 | * be removed. This is something which needs to be looked into | |
686 | * when we are fixing the outstanding issues with multi-homing | |
687 | * socket routing and failover schemes. Refer to comments in | |
688 | * sctp_do_bind(). -daisy | |
689 | */ | |
0ed90fb0 | 690 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
691 | |
692 | addr_buf += af->sockaddr_len; | |
693 | err_bindx_rem: | |
694 | if (retval < 0) { | |
695 | /* Failed. Add the ones that has been removed back */ | |
696 | if (cnt > 0) | |
697 | sctp_bindx_add(sk, addrs, cnt); | |
698 | return retval; | |
699 | } | |
700 | } | |
701 | ||
702 | return retval; | |
703 | } | |
704 | ||
705 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
706 | * the associations that are part of the endpoint indicating that a list of | |
707 | * local addresses are removed from the endpoint. | |
708 | * | |
d808ad9a | 709 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
710 | * association, we do not send the chunk for that association. But it will not |
711 | * affect other associations. | |
712 | * | |
713 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
714 | */ | |
715 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
716 | struct sockaddr *addrs, | |
717 | int addrcnt) | |
718 | { | |
719 | struct sctp_sock *sp; | |
720 | struct sctp_endpoint *ep; | |
721 | struct sctp_association *asoc; | |
dc022a98 | 722 | struct sctp_transport *transport; |
1da177e4 LT |
723 | struct sctp_bind_addr *bp; |
724 | struct sctp_chunk *chunk; | |
725 | union sctp_addr *laddr; | |
726 | void *addr_buf; | |
727 | struct sctp_af *af; | |
dc022a98 | 728 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
729 | int i; |
730 | int retval = 0; | |
8a07eb0a | 731 | int stored = 0; |
1da177e4 | 732 | |
8a07eb0a | 733 | chunk = NULL; |
1da177e4 LT |
734 | if (!sctp_addip_enable) |
735 | return retval; | |
736 | ||
737 | sp = sctp_sk(sk); | |
738 | ep = sp->ep; | |
739 | ||
740 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
0dc47877 | 741 | __func__, sk, addrs, addrcnt); |
1da177e4 | 742 | |
9dbc15f0 | 743 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
744 | |
745 | if (!asoc->peer.asconf_capable) | |
746 | continue; | |
747 | ||
748 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
749 | continue; | |
750 | ||
751 | if (!sctp_state(asoc, ESTABLISHED)) | |
752 | continue; | |
753 | ||
754 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 755 | * not present in the bind address list of the association. |
1da177e4 LT |
756 | * If so, do not send the asconf chunk to its peer, but |
757 | * continue with other associations. | |
758 | */ | |
759 | addr_buf = addrs; | |
760 | for (i = 0; i < addrcnt; i++) { | |
761 | laddr = (union sctp_addr *)addr_buf; | |
762 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
763 | if (!af) { | |
764 | retval = -EINVAL; | |
765 | goto out; | |
766 | } | |
767 | ||
768 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
769 | break; | |
770 | ||
771 | addr_buf += af->sockaddr_len; | |
772 | } | |
773 | if (i < addrcnt) | |
774 | continue; | |
775 | ||
776 | /* Find one address in the association's bind address list | |
777 | * that is not in the packed array of addresses. This is to | |
778 | * make sure that we do not delete all the addresses in the | |
779 | * association. | |
780 | */ | |
1da177e4 LT |
781 | bp = &asoc->base.bind_addr; |
782 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
783 | addrcnt, sp); | |
8a07eb0a MH |
784 | if ((laddr == NULL) && (addrcnt == 1)) { |
785 | if (asoc->asconf_addr_del_pending) | |
786 | continue; | |
787 | asoc->asconf_addr_del_pending = | |
788 | kzalloc(sizeof(union sctp_addr), GFP_ATOMIC); | |
6d65e5ee MH |
789 | if (asoc->asconf_addr_del_pending == NULL) { |
790 | retval = -ENOMEM; | |
791 | goto out; | |
792 | } | |
8a07eb0a MH |
793 | asoc->asconf_addr_del_pending->sa.sa_family = |
794 | addrs->sa_family; | |
795 | asoc->asconf_addr_del_pending->v4.sin_port = | |
796 | htons(bp->port); | |
797 | if (addrs->sa_family == AF_INET) { | |
798 | struct sockaddr_in *sin; | |
799 | ||
800 | sin = (struct sockaddr_in *)addrs; | |
801 | asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr; | |
802 | } else if (addrs->sa_family == AF_INET6) { | |
803 | struct sockaddr_in6 *sin6; | |
804 | ||
805 | sin6 = (struct sockaddr_in6 *)addrs; | |
806 | ipv6_addr_copy(&asoc->asconf_addr_del_pending->v6.sin6_addr, &sin6->sin6_addr); | |
807 | } | |
808 | SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ", | |
809 | " at %p\n", asoc, asoc->asconf_addr_del_pending, | |
810 | asoc->asconf_addr_del_pending); | |
811 | asoc->src_out_of_asoc_ok = 1; | |
812 | stored = 1; | |
813 | goto skip_mkasconf; | |
814 | } | |
1da177e4 | 815 | |
559cf710 VY |
816 | /* We do not need RCU protection throughout this loop |
817 | * because this is done under a socket lock from the | |
818 | * setsockopt call. | |
819 | */ | |
1da177e4 LT |
820 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
821 | SCTP_PARAM_DEL_IP); | |
822 | if (!chunk) { | |
823 | retval = -ENOMEM; | |
824 | goto out; | |
825 | } | |
826 | ||
8a07eb0a | 827 | skip_mkasconf: |
dc022a98 SS |
828 | /* Reset use_as_src flag for the addresses in the bind address |
829 | * list that are to be deleted. | |
830 | */ | |
dc022a98 SS |
831 | addr_buf = addrs; |
832 | for (i = 0; i < addrcnt; i++) { | |
833 | laddr = (union sctp_addr *)addr_buf; | |
834 | af = sctp_get_af_specific(laddr->v4.sin_family); | |
559cf710 | 835 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 836 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 837 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
838 | } |
839 | addr_buf += af->sockaddr_len; | |
840 | } | |
1da177e4 | 841 | |
dc022a98 SS |
842 | /* Update the route and saddr entries for all the transports |
843 | * as some of the addresses in the bind address list are | |
844 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 845 | */ |
9dbc15f0 RD |
846 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
847 | transports) { | |
dc022a98 SS |
848 | dst_release(transport->dst); |
849 | sctp_transport_route(transport, NULL, | |
850 | sctp_sk(asoc->base.sk)); | |
851 | } | |
852 | ||
8a07eb0a MH |
853 | if (stored) |
854 | /* We don't need to transmit ASCONF */ | |
855 | continue; | |
dc022a98 | 856 | retval = sctp_send_asconf(asoc, chunk); |
1da177e4 LT |
857 | } |
858 | out: | |
859 | return retval; | |
860 | } | |
861 | ||
9f7d653b MH |
862 | /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */ |
863 | int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) | |
864 | { | |
865 | struct sock *sk = sctp_opt2sk(sp); | |
866 | union sctp_addr *addr; | |
867 | struct sctp_af *af; | |
868 | ||
869 | /* It is safe to write port space in caller. */ | |
870 | addr = &addrw->a; | |
871 | addr->v4.sin_port = htons(sp->ep->base.bind_addr.port); | |
872 | af = sctp_get_af_specific(addr->sa.sa_family); | |
873 | if (!af) | |
874 | return -EINVAL; | |
875 | if (sctp_verify_addr(sk, addr, af->sockaddr_len)) | |
876 | return -EINVAL; | |
877 | ||
878 | if (addrw->state == SCTP_ADDR_NEW) | |
879 | return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1); | |
880 | else | |
881 | return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1); | |
882 | } | |
883 | ||
1da177e4 LT |
884 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
885 | * | |
886 | * API 8.1 | |
887 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
888 | * int flags); | |
889 | * | |
890 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
891 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
892 | * or IPv6 addresses. | |
893 | * | |
894 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
895 | * Section 3.1.2 for this usage. | |
896 | * | |
897 | * addrs is a pointer to an array of one or more socket addresses. Each | |
898 | * address is contained in its appropriate structure (i.e. struct | |
899 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 900 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
901 | * representation is termed a "packed array" of addresses). The caller |
902 | * specifies the number of addresses in the array with addrcnt. | |
903 | * | |
904 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
905 | * -1, and sets errno to the appropriate error code. | |
906 | * | |
907 | * For SCTP, the port given in each socket address must be the same, or | |
908 | * sctp_bindx() will fail, setting errno to EINVAL. | |
909 | * | |
910 | * The flags parameter is formed from the bitwise OR of zero or more of | |
911 | * the following currently defined flags: | |
912 | * | |
913 | * SCTP_BINDX_ADD_ADDR | |
914 | * | |
915 | * SCTP_BINDX_REM_ADDR | |
916 | * | |
917 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
918 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
919 | * addresses from the association. The two flags are mutually exclusive; | |
920 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
921 | * not remove all addresses from an association; sctp_bindx() will | |
922 | * reject such an attempt with EINVAL. | |
923 | * | |
924 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
925 | * additional addresses with an endpoint after calling bind(). Or use | |
926 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
927 | * socket is associated with so that no new association accepted will be | |
928 | * associated with those addresses. If the endpoint supports dynamic | |
929 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
930 | * endpoint to send the appropriate message to the peer to change the | |
931 | * peers address lists. | |
932 | * | |
933 | * Adding and removing addresses from a connected association is | |
934 | * optional functionality. Implementations that do not support this | |
935 | * functionality should return EOPNOTSUPP. | |
936 | * | |
937 | * Basically do nothing but copying the addresses from user to kernel | |
938 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
939 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
940 | * from userspace. | |
1da177e4 LT |
941 | * |
942 | * We don't use copy_from_user() for optimization: we first do the | |
943 | * sanity checks (buffer size -fast- and access check-healthy | |
944 | * pointer); if all of those succeed, then we can alloc the memory | |
945 | * (expensive operation) needed to copy the data to kernel. Then we do | |
946 | * the copying without checking the user space area | |
947 | * (__copy_from_user()). | |
948 | * | |
949 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
950 | * it. | |
951 | * | |
952 | * sk The sk of the socket | |
953 | * addrs The pointer to the addresses in user land | |
954 | * addrssize Size of the addrs buffer | |
955 | * op Operation to perform (add or remove, see the flags of | |
956 | * sctp_bindx) | |
957 | * | |
958 | * Returns 0 if ok, <0 errno code on error. | |
959 | */ | |
960 | SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk, | |
961 | struct sockaddr __user *addrs, | |
962 | int addrs_size, int op) | |
963 | { | |
964 | struct sockaddr *kaddrs; | |
965 | int err; | |
966 | int addrcnt = 0; | |
967 | int walk_size = 0; | |
968 | struct sockaddr *sa_addr; | |
969 | void *addr_buf; | |
970 | struct sctp_af *af; | |
971 | ||
972 | SCTP_DEBUG_PRINTK("sctp_setsocktopt_bindx: sk %p addrs %p" | |
973 | " addrs_size %d opt %d\n", sk, addrs, addrs_size, op); | |
974 | ||
975 | if (unlikely(addrs_size <= 0)) | |
976 | return -EINVAL; | |
977 | ||
978 | /* Check the user passed a healthy pointer. */ | |
979 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
980 | return -EFAULT; | |
981 | ||
982 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 983 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1da177e4 LT |
984 | if (unlikely(!kaddrs)) |
985 | return -ENOMEM; | |
986 | ||
987 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
988 | kfree(kaddrs); | |
989 | return -EFAULT; | |
990 | } | |
991 | ||
d808ad9a | 992 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
993 | addr_buf = kaddrs; |
994 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
995 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
996 | kfree(kaddrs); | |
997 | return -EINVAL; | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | sa_addr = (struct sockaddr *)addr_buf; |
1001 | af = sctp_get_af_specific(sa_addr->sa_family); | |
1002 | ||
1003 | /* If the address family is not supported or if this address | |
1004 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 1005 | */ |
1da177e4 LT |
1006 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
1007 | kfree(kaddrs); | |
1008 | return -EINVAL; | |
1009 | } | |
1010 | addrcnt++; | |
1011 | addr_buf += af->sockaddr_len; | |
1012 | walk_size += af->sockaddr_len; | |
1013 | } | |
1014 | ||
1015 | /* Do the work. */ | |
1016 | switch (op) { | |
1017 | case SCTP_BINDX_ADD_ADDR: | |
1018 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
1019 | if (err) | |
1020 | goto out; | |
1021 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
1022 | break; | |
1023 | ||
1024 | case SCTP_BINDX_REM_ADDR: | |
1025 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
1026 | if (err) | |
1027 | goto out; | |
1028 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
1029 | break; | |
1030 | ||
1031 | default: | |
1032 | err = -EINVAL; | |
1033 | break; | |
3ff50b79 | 1034 | } |
1da177e4 LT |
1035 | |
1036 | out: | |
1037 | kfree(kaddrs); | |
1038 | ||
1039 | return err; | |
1040 | } | |
1041 | ||
3f7a87d2 FF |
1042 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
1043 | * | |
1044 | * Common routine for handling connect() and sctp_connectx(). | |
1045 | * Connect will come in with just a single address. | |
1046 | */ | |
1047 | static int __sctp_connect(struct sock* sk, | |
1048 | struct sockaddr *kaddrs, | |
88a0a948 VY |
1049 | int addrs_size, |
1050 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1051 | { |
1052 | struct sctp_sock *sp; | |
1053 | struct sctp_endpoint *ep; | |
1054 | struct sctp_association *asoc = NULL; | |
1055 | struct sctp_association *asoc2; | |
1056 | struct sctp_transport *transport; | |
1057 | union sctp_addr to; | |
1058 | struct sctp_af *af; | |
1059 | sctp_scope_t scope; | |
1060 | long timeo; | |
1061 | int err = 0; | |
1062 | int addrcnt = 0; | |
1063 | int walk_size = 0; | |
e4d1feab | 1064 | union sctp_addr *sa_addr = NULL; |
3f7a87d2 | 1065 | void *addr_buf; |
16d00fb7 | 1066 | unsigned short port; |
f50f95ca | 1067 | unsigned int f_flags = 0; |
3f7a87d2 FF |
1068 | |
1069 | sp = sctp_sk(sk); | |
1070 | ep = sp->ep; | |
1071 | ||
1072 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
1073 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1074 | * is already connected. | |
1075 | * It cannot be done even on a TCP-style listening socket. | |
1076 | */ | |
1077 | if (sctp_sstate(sk, ESTABLISHED) || | |
1078 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1079 | err = -EISCONN; | |
1080 | goto out_free; | |
1081 | } | |
1082 | ||
1083 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1084 | addr_buf = kaddrs; | |
1085 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
1086 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
1087 | err = -EINVAL; | |
1088 | goto out_free; | |
1089 | } | |
1090 | ||
4bdf4b5f AV |
1091 | sa_addr = (union sctp_addr *)addr_buf; |
1092 | af = sctp_get_af_specific(sa_addr->sa.sa_family); | |
3f7a87d2 FF |
1093 | |
1094 | /* If the address family is not supported or if this address | |
1095 | * causes the address buffer to overflow return EINVAL. | |
1096 | */ | |
1097 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1098 | err = -EINVAL; | |
1099 | goto out_free; | |
1100 | } | |
1101 | ||
d7e0d19a DR |
1102 | port = ntohs(sa_addr->v4.sin_port); |
1103 | ||
e4d1feab VY |
1104 | /* Save current address so we can work with it */ |
1105 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1106 | ||
1107 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
3f7a87d2 FF |
1108 | if (err) |
1109 | goto out_free; | |
1110 | ||
16d00fb7 VY |
1111 | /* Make sure the destination port is correctly set |
1112 | * in all addresses. | |
1113 | */ | |
1114 | if (asoc && asoc->peer.port && asoc->peer.port != port) | |
1115 | goto out_free; | |
1116 | ||
3f7a87d2 FF |
1117 | |
1118 | /* Check if there already is a matching association on the | |
1119 | * endpoint (other than the one created here). | |
1120 | */ | |
e4d1feab | 1121 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1122 | if (asoc2 && asoc2 != asoc) { |
1123 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1124 | err = -EISCONN; | |
1125 | else | |
1126 | err = -EALREADY; | |
1127 | goto out_free; | |
1128 | } | |
1129 | ||
1130 | /* If we could not find a matching association on the endpoint, | |
1131 | * make sure that there is no peeled-off association matching | |
1132 | * the peer address even on another socket. | |
1133 | */ | |
e4d1feab | 1134 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1135 | err = -EADDRNOTAVAIL; |
1136 | goto out_free; | |
1137 | } | |
1138 | ||
1139 | if (!asoc) { | |
1140 | /* If a bind() or sctp_bindx() is not called prior to | |
1141 | * an sctp_connectx() call, the system picks an | |
1142 | * ephemeral port and will choose an address set | |
1143 | * equivalent to binding with a wildcard address. | |
1144 | */ | |
1145 | if (!ep->base.bind_addr.port) { | |
1146 | if (sctp_autobind(sk)) { | |
1147 | err = -EAGAIN; | |
1148 | goto out_free; | |
1149 | } | |
64a0c1c8 ISJ |
1150 | } else { |
1151 | /* | |
d808ad9a YH |
1152 | * If an unprivileged user inherits a 1-many |
1153 | * style socket with open associations on a | |
1154 | * privileged port, it MAY be permitted to | |
1155 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1156 | * be permitted to open new associations. |
1157 | */ | |
1158 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1159 | !capable(CAP_NET_BIND_SERVICE)) { | |
1160 | err = -EACCES; | |
1161 | goto out_free; | |
1162 | } | |
3f7a87d2 FF |
1163 | } |
1164 | ||
e4d1feab | 1165 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1166 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1167 | if (!asoc) { | |
1168 | err = -ENOMEM; | |
1169 | goto out_free; | |
1170 | } | |
409b95af VY |
1171 | |
1172 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1173 | GFP_KERNEL); | |
1174 | if (err < 0) { | |
1175 | goto out_free; | |
1176 | } | |
1177 | ||
3f7a87d2 FF |
1178 | } |
1179 | ||
1180 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1181 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1182 | SCTP_UNKNOWN); |
1183 | if (!transport) { | |
1184 | err = -ENOMEM; | |
1185 | goto out_free; | |
1186 | } | |
1187 | ||
1188 | addrcnt++; | |
1189 | addr_buf += af->sockaddr_len; | |
1190 | walk_size += af->sockaddr_len; | |
1191 | } | |
1192 | ||
c6ba68a2 VY |
1193 | /* In case the user of sctp_connectx() wants an association |
1194 | * id back, assign one now. | |
1195 | */ | |
1196 | if (assoc_id) { | |
1197 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1198 | if (err < 0) | |
1199 | goto out_free; | |
1200 | } | |
1201 | ||
3f7a87d2 FF |
1202 | err = sctp_primitive_ASSOCIATE(asoc, NULL); |
1203 | if (err < 0) { | |
1204 | goto out_free; | |
1205 | } | |
1206 | ||
1207 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1208 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
e4d1feab VY |
1209 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1210 | af->to_sk_daddr(sa_addr, sk); | |
8de8c873 | 1211 | sk->sk_err = 0; |
3f7a87d2 | 1212 | |
f50f95ca VY |
1213 | /* in-kernel sockets don't generally have a file allocated to them |
1214 | * if all they do is call sock_create_kern(). | |
1215 | */ | |
1216 | if (sk->sk_socket->file) | |
1217 | f_flags = sk->sk_socket->file->f_flags; | |
1218 | ||
1219 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1220 | ||
3f7a87d2 | 1221 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1222 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1223 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1224 | |
1225 | /* Don't free association on exit. */ | |
1226 | asoc = NULL; | |
1227 | ||
1228 | out_free: | |
1229 | ||
1230 | SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p" | |
d808ad9a YH |
1231 | " kaddrs: %p err: %d\n", |
1232 | asoc, kaddrs, err); | |
3f7a87d2 FF |
1233 | if (asoc) |
1234 | sctp_association_free(asoc); | |
1235 | return err; | |
1236 | } | |
1237 | ||
1238 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1239 | * | |
1240 | * API 8.9 | |
88a0a948 VY |
1241 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1242 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1243 | * |
1244 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1245 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1246 | * or IPv6 addresses. | |
1247 | * | |
1248 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1249 | * Section 3.1.2 for this usage. | |
1250 | * | |
1251 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1252 | * address is contained in its appropriate structure (i.e. struct | |
1253 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1254 | * must be used to distengish the address length (note that this | |
1255 | * representation is termed a "packed array" of addresses). The caller | |
1256 | * specifies the number of addresses in the array with addrcnt. | |
1257 | * | |
88a0a948 VY |
1258 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1259 | * the association id of the new association. On failure, sctp_connectx() | |
1260 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1261 | * is not touched by the kernel. | |
3f7a87d2 FF |
1262 | * |
1263 | * For SCTP, the port given in each socket address must be the same, or | |
1264 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1265 | * | |
1266 | * An application can use sctp_connectx to initiate an association with | |
1267 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1268 | * allows a caller to specify multiple addresses at which a peer can be | |
1269 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1270 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1271 | * specifies that the stack will try to make use of all the addresses in |
1272 | * the list when needed. | |
1273 | * | |
1274 | * Note that the list of addresses passed in is only used for setting up | |
1275 | * the association. It does not necessarily equal the set of addresses | |
1276 | * the peer uses for the resulting association. If the caller wants to | |
1277 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1278 | * retrieve them after the association has been set up. | |
1279 | * | |
1280 | * Basically do nothing but copying the addresses from user to kernel | |
1281 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1282 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1283 | * | |
1284 | * We don't use copy_from_user() for optimization: we first do the | |
1285 | * sanity checks (buffer size -fast- and access check-healthy | |
1286 | * pointer); if all of those succeed, then we can alloc the memory | |
1287 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1288 | * the copying without checking the user space area | |
1289 | * (__copy_from_user()). | |
1290 | * | |
1291 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1292 | * it. | |
1293 | * | |
1294 | * sk The sk of the socket | |
1295 | * addrs The pointer to the addresses in user land | |
1296 | * addrssize Size of the addrs buffer | |
1297 | * | |
88a0a948 | 1298 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1299 | */ |
88a0a948 | 1300 | SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk, |
3f7a87d2 | 1301 | struct sockaddr __user *addrs, |
88a0a948 VY |
1302 | int addrs_size, |
1303 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1304 | { |
1305 | int err = 0; | |
1306 | struct sockaddr *kaddrs; | |
1307 | ||
1308 | SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n", | |
0dc47877 | 1309 | __func__, sk, addrs, addrs_size); |
3f7a87d2 FF |
1310 | |
1311 | if (unlikely(addrs_size <= 0)) | |
1312 | return -EINVAL; | |
1313 | ||
1314 | /* Check the user passed a healthy pointer. */ | |
1315 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1316 | return -EFAULT; | |
1317 | ||
1318 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 1319 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
3f7a87d2 FF |
1320 | if (unlikely(!kaddrs)) |
1321 | return -ENOMEM; | |
1322 | ||
1323 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1324 | err = -EFAULT; | |
1325 | } else { | |
88a0a948 | 1326 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1327 | } |
1328 | ||
1329 | kfree(kaddrs); | |
88a0a948 | 1330 | |
3f7a87d2 FF |
1331 | return err; |
1332 | } | |
1333 | ||
88a0a948 VY |
1334 | /* |
1335 | * This is an older interface. It's kept for backward compatibility | |
1336 | * to the option that doesn't provide association id. | |
1337 | */ | |
1338 | SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk, | |
1339 | struct sockaddr __user *addrs, | |
1340 | int addrs_size) | |
1341 | { | |
1342 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * New interface for the API. The since the API is done with a socket | |
1347 | * option, to make it simple we feed back the association id is as a return | |
1348 | * indication to the call. Error is always negative and association id is | |
1349 | * always positive. | |
1350 | */ | |
1351 | SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk, | |
1352 | struct sockaddr __user *addrs, | |
1353 | int addrs_size) | |
1354 | { | |
1355 | sctp_assoc_t assoc_id = 0; | |
1356 | int err = 0; | |
1357 | ||
1358 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1359 | ||
1360 | if (err) | |
1361 | return err; | |
1362 | else | |
1363 | return assoc_id; | |
1364 | } | |
1365 | ||
c6ba68a2 | 1366 | /* |
f9c67811 VY |
1367 | * New (hopefully final) interface for the API. |
1368 | * We use the sctp_getaddrs_old structure so that use-space library | |
1369 | * can avoid any unnecessary allocations. The only defferent part | |
1370 | * is that we store the actual length of the address buffer into the | |
1371 | * addrs_num structure member. That way we can re-use the existing | |
1372 | * code. | |
c6ba68a2 VY |
1373 | */ |
1374 | SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len, | |
1375 | char __user *optval, | |
1376 | int __user *optlen) | |
1377 | { | |
f9c67811 | 1378 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1379 | sctp_assoc_t assoc_id = 0; |
1380 | int err = 0; | |
1381 | ||
f9c67811 | 1382 | if (len < sizeof(param)) |
c6ba68a2 VY |
1383 | return -EINVAL; |
1384 | ||
f9c67811 VY |
1385 | if (copy_from_user(¶m, optval, sizeof(param))) |
1386 | return -EFAULT; | |
1387 | ||
c6ba68a2 | 1388 | err = __sctp_setsockopt_connectx(sk, |
f9c67811 VY |
1389 | (struct sockaddr __user *)param.addrs, |
1390 | param.addr_num, &assoc_id); | |
c6ba68a2 VY |
1391 | |
1392 | if (err == 0 || err == -EINPROGRESS) { | |
1393 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1394 | return -EFAULT; | |
1395 | if (put_user(sizeof(assoc_id), optlen)) | |
1396 | return -EFAULT; | |
1397 | } | |
1398 | ||
1399 | return err; | |
1400 | } | |
1401 | ||
1da177e4 LT |
1402 | /* API 3.1.4 close() - UDP Style Syntax |
1403 | * Applications use close() to perform graceful shutdown (as described in | |
1404 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1405 | * by a UDP-style socket. | |
1406 | * | |
1407 | * The syntax is | |
1408 | * | |
1409 | * ret = close(int sd); | |
1410 | * | |
1411 | * sd - the socket descriptor of the associations to be closed. | |
1412 | * | |
1413 | * To gracefully shutdown a specific association represented by the | |
1414 | * UDP-style socket, an application should use the sendmsg() call, | |
1415 | * passing no user data, but including the appropriate flag in the | |
1416 | * ancillary data (see Section xxxx). | |
1417 | * | |
1418 | * If sd in the close() call is a branched-off socket representing only | |
1419 | * one association, the shutdown is performed on that association only. | |
1420 | * | |
1421 | * 4.1.6 close() - TCP Style Syntax | |
1422 | * | |
1423 | * Applications use close() to gracefully close down an association. | |
1424 | * | |
1425 | * The syntax is: | |
1426 | * | |
1427 | * int close(int sd); | |
1428 | * | |
1429 | * sd - the socket descriptor of the association to be closed. | |
1430 | * | |
1431 | * After an application calls close() on a socket descriptor, no further | |
1432 | * socket operations will succeed on that descriptor. | |
1433 | * | |
1434 | * API 7.1.4 SO_LINGER | |
1435 | * | |
1436 | * An application using the TCP-style socket can use this option to | |
1437 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1438 | * | |
1439 | * struct linger { | |
1440 | * int l_onoff; // option on/off | |
1441 | * int l_linger; // linger time | |
1442 | * }; | |
1443 | * | |
1444 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1445 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1446 | * value is set to a negative value, the setsockopt() call will return | |
1447 | * an error. If the value is set to a positive value linger_time, the | |
1448 | * close() can be blocked for at most linger_time ms. If the graceful | |
1449 | * shutdown phase does not finish during this period, close() will | |
1450 | * return but the graceful shutdown phase continues in the system. | |
1451 | */ | |
1452 | SCTP_STATIC void sctp_close(struct sock *sk, long timeout) | |
1453 | { | |
1454 | struct sctp_endpoint *ep; | |
1455 | struct sctp_association *asoc; | |
1456 | struct list_head *pos, *temp; | |
1457 | ||
1458 | SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout); | |
1459 | ||
1460 | sctp_lock_sock(sk); | |
1461 | sk->sk_shutdown = SHUTDOWN_MASK; | |
bec9640b | 1462 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1463 | |
1464 | ep = sctp_sk(sk)->ep; | |
1465 | ||
61c9fed4 | 1466 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1467 | list_for_each_safe(pos, temp, &ep->asocs) { |
1468 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1469 | ||
1470 | if (sctp_style(sk, TCP)) { | |
1471 | /* A closed association can still be in the list if | |
1472 | * it belongs to a TCP-style listening socket that is | |
1473 | * not yet accepted. If so, free it. If not, send an | |
1474 | * ABORT or SHUTDOWN based on the linger options. | |
1475 | */ | |
1476 | if (sctp_state(asoc, CLOSED)) { | |
1477 | sctp_unhash_established(asoc); | |
1478 | sctp_association_free(asoc); | |
b89498a1 VY |
1479 | continue; |
1480 | } | |
1481 | } | |
1da177e4 | 1482 | |
b9ac8672 SS |
1483 | if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
1484 | struct sctp_chunk *chunk; | |
1485 | ||
1486 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1487 | if (chunk) | |
1488 | sctp_primitive_ABORT(asoc, chunk); | |
1489 | } else | |
1da177e4 LT |
1490 | sctp_primitive_SHUTDOWN(asoc, NULL); |
1491 | } | |
1492 | ||
1493 | /* Clean up any skbs sitting on the receive queue. */ | |
1494 | sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1495 | sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1496 | ||
1497 | /* On a TCP-style socket, block for at most linger_time if set. */ | |
1498 | if (sctp_style(sk, TCP) && timeout) | |
1499 | sctp_wait_for_close(sk, timeout); | |
1500 | ||
1501 | /* This will run the backlog queue. */ | |
1502 | sctp_release_sock(sk); | |
1503 | ||
1504 | /* Supposedly, no process has access to the socket, but | |
1505 | * the net layers still may. | |
1506 | */ | |
1507 | sctp_local_bh_disable(); | |
1508 | sctp_bh_lock_sock(sk); | |
1509 | ||
1510 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1511 | * and we have just a little more cleanup. | |
1512 | */ | |
1513 | sock_hold(sk); | |
1514 | sk_common_release(sk); | |
1515 | ||
1516 | sctp_bh_unlock_sock(sk); | |
1517 | sctp_local_bh_enable(); | |
1518 | ||
1519 | sock_put(sk); | |
1520 | ||
1521 | SCTP_DBG_OBJCNT_DEC(sock); | |
1522 | } | |
1523 | ||
1524 | /* Handle EPIPE error. */ | |
1525 | static int sctp_error(struct sock *sk, int flags, int err) | |
1526 | { | |
1527 | if (err == -EPIPE) | |
1528 | err = sock_error(sk) ? : -EPIPE; | |
1529 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1530 | send_sig(SIGPIPE, current, 0); | |
1531 | return err; | |
1532 | } | |
1533 | ||
1534 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1535 | * | |
1536 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1537 | * and receive data from its peer. | |
1538 | * | |
1539 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1540 | * int flags); | |
1541 | * | |
1542 | * socket - the socket descriptor of the endpoint. | |
1543 | * message - pointer to the msghdr structure which contains a single | |
1544 | * user message and possibly some ancillary data. | |
1545 | * | |
1546 | * See Section 5 for complete description of the data | |
1547 | * structures. | |
1548 | * | |
1549 | * flags - flags sent or received with the user message, see Section | |
1550 | * 5 for complete description of the flags. | |
1551 | * | |
1552 | * Note: This function could use a rewrite especially when explicit | |
1553 | * connect support comes in. | |
1554 | */ | |
1555 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1556 | ||
1557 | SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); | |
1558 | ||
1559 | SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, | |
1560 | struct msghdr *msg, size_t msg_len) | |
1561 | { | |
1562 | struct sctp_sock *sp; | |
1563 | struct sctp_endpoint *ep; | |
1564 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1565 | struct sctp_transport *transport, *chunk_tp; | |
1566 | struct sctp_chunk *chunk; | |
dce116ae | 1567 | union sctp_addr to; |
1da177e4 | 1568 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1569 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1570 | struct sctp_sndrcvinfo *sinfo; |
1571 | struct sctp_initmsg *sinit; | |
1572 | sctp_assoc_t associd = 0; | |
1573 | sctp_cmsgs_t cmsgs = { NULL }; | |
1574 | int err; | |
1575 | sctp_scope_t scope; | |
1576 | long timeo; | |
1577 | __u16 sinfo_flags = 0; | |
1578 | struct sctp_datamsg *datamsg; | |
1da177e4 LT |
1579 | int msg_flags = msg->msg_flags; |
1580 | ||
1581 | SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n", | |
1582 | sk, msg, msg_len); | |
1583 | ||
1584 | err = 0; | |
1585 | sp = sctp_sk(sk); | |
1586 | ep = sp->ep; | |
1587 | ||
3f7a87d2 | 1588 | SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep); |
1da177e4 LT |
1589 | |
1590 | /* We cannot send a message over a TCP-style listening socket. */ | |
1591 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1592 | err = -EPIPE; | |
1593 | goto out_nounlock; | |
1594 | } | |
1595 | ||
1596 | /* Parse out the SCTP CMSGs. */ | |
1597 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1598 | ||
1599 | if (err) { | |
1600 | SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err); | |
1601 | goto out_nounlock; | |
1602 | } | |
1603 | ||
1604 | /* Fetch the destination address for this packet. This | |
1605 | * address only selects the association--it is not necessarily | |
1606 | * the address we will send to. | |
1607 | * For a peeled-off socket, msg_name is ignored. | |
1608 | */ | |
1609 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1610 | int msg_namelen = msg->msg_namelen; | |
1611 | ||
1612 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1613 | msg_namelen); | |
1614 | if (err) | |
1615 | return err; | |
1616 | ||
1617 | if (msg_namelen > sizeof(to)) | |
1618 | msg_namelen = sizeof(to); | |
1619 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1620 | msg_name = msg->msg_name; |
1621 | } | |
1622 | ||
1623 | sinfo = cmsgs.info; | |
1624 | sinit = cmsgs.init; | |
1625 | ||
1626 | /* Did the user specify SNDRCVINFO? */ | |
1627 | if (sinfo) { | |
1628 | sinfo_flags = sinfo->sinfo_flags; | |
1629 | associd = sinfo->sinfo_assoc_id; | |
1630 | } | |
1631 | ||
1632 | SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n", | |
1633 | msg_len, sinfo_flags); | |
1634 | ||
eaa5c54d ISJ |
1635 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1636 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1637 | err = -EINVAL; |
1638 | goto out_nounlock; | |
1639 | } | |
1640 | ||
eaa5c54d ISJ |
1641 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1642 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1643 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1644 | * the msg_iov set to the user abort reason. |
d808ad9a | 1645 | */ |
eaa5c54d ISJ |
1646 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1647 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1648 | err = -EINVAL; |
1649 | goto out_nounlock; | |
1650 | } | |
1651 | ||
eaa5c54d | 1652 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1653 | * specified in msg_name. |
1654 | */ | |
eaa5c54d | 1655 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1656 | err = -EINVAL; |
1657 | goto out_nounlock; | |
1658 | } | |
1659 | ||
1660 | transport = NULL; | |
1661 | ||
1662 | SCTP_DEBUG_PRINTK("About to look up association.\n"); | |
1663 | ||
1664 | sctp_lock_sock(sk); | |
1665 | ||
1666 | /* If a msg_name has been specified, assume this is to be used. */ | |
1667 | if (msg_name) { | |
1668 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1669 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1670 | if (!asoc) { |
1671 | /* If we could not find a matching association on the | |
1672 | * endpoint, make sure that it is not a TCP-style | |
1673 | * socket that already has an association or there is | |
1674 | * no peeled-off association on another socket. | |
1675 | */ | |
1676 | if ((sctp_style(sk, TCP) && | |
1677 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1678 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1679 | err = -EADDRNOTAVAIL; |
1680 | goto out_unlock; | |
1681 | } | |
1682 | } | |
1683 | } else { | |
1684 | asoc = sctp_id2assoc(sk, associd); | |
1685 | if (!asoc) { | |
1686 | err = -EPIPE; | |
1687 | goto out_unlock; | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | if (asoc) { | |
1692 | SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc); | |
1693 | ||
1694 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1695 | * socket that has an association in CLOSED state. This can | |
1696 | * happen when an accepted socket has an association that is | |
1697 | * already CLOSED. | |
1698 | */ | |
1699 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1700 | err = -EPIPE; | |
1701 | goto out_unlock; | |
1702 | } | |
1703 | ||
eaa5c54d | 1704 | if (sinfo_flags & SCTP_EOF) { |
1da177e4 LT |
1705 | SCTP_DEBUG_PRINTK("Shutting down association: %p\n", |
1706 | asoc); | |
1707 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
1708 | err = 0; | |
1709 | goto out_unlock; | |
1710 | } | |
eaa5c54d | 1711 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1712 | |
1713 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1714 | if (!chunk) { | |
1715 | err = -ENOMEM; | |
1716 | goto out_unlock; | |
1717 | } | |
1718 | ||
1da177e4 | 1719 | SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc); |
c164a9ba | 1720 | sctp_primitive_ABORT(asoc, chunk); |
1da177e4 LT |
1721 | err = 0; |
1722 | goto out_unlock; | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | /* Do we need to create the association? */ | |
1727 | if (!asoc) { | |
1728 | SCTP_DEBUG_PRINTK("There is no association yet.\n"); | |
1729 | ||
eaa5c54d | 1730 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1731 | err = -EINVAL; |
1732 | goto out_unlock; | |
1733 | } | |
1734 | ||
1735 | /* Check for invalid stream against the stream counts, | |
1736 | * either the default or the user specified stream counts. | |
1737 | */ | |
1738 | if (sinfo) { | |
1739 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1740 | /* Check against the defaults. */ | |
1741 | if (sinfo->sinfo_stream >= | |
1742 | sp->initmsg.sinit_num_ostreams) { | |
1743 | err = -EINVAL; | |
1744 | goto out_unlock; | |
1745 | } | |
1746 | } else { | |
1747 | /* Check against the requested. */ | |
1748 | if (sinfo->sinfo_stream >= | |
1749 | sinit->sinit_num_ostreams) { | |
1750 | err = -EINVAL; | |
1751 | goto out_unlock; | |
1752 | } | |
1753 | } | |
1754 | } | |
1755 | ||
1756 | /* | |
1757 | * API 3.1.2 bind() - UDP Style Syntax | |
1758 | * If a bind() or sctp_bindx() is not called prior to a | |
1759 | * sendmsg() call that initiates a new association, the | |
1760 | * system picks an ephemeral port and will choose an address | |
1761 | * set equivalent to binding with a wildcard address. | |
1762 | */ | |
1763 | if (!ep->base.bind_addr.port) { | |
1764 | if (sctp_autobind(sk)) { | |
1765 | err = -EAGAIN; | |
1766 | goto out_unlock; | |
1767 | } | |
64a0c1c8 ISJ |
1768 | } else { |
1769 | /* | |
1770 | * If an unprivileged user inherits a one-to-many | |
1771 | * style socket with open associations on a privileged | |
1772 | * port, it MAY be permitted to accept new associations, | |
1773 | * but it SHOULD NOT be permitted to open new | |
1774 | * associations. | |
1775 | */ | |
1776 | if (ep->base.bind_addr.port < PROT_SOCK && | |
1777 | !capable(CAP_NET_BIND_SERVICE)) { | |
1778 | err = -EACCES; | |
1779 | goto out_unlock; | |
1780 | } | |
1da177e4 LT |
1781 | } |
1782 | ||
1783 | scope = sctp_scope(&to); | |
1784 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1785 | if (!new_asoc) { | |
1786 | err = -ENOMEM; | |
1787 | goto out_unlock; | |
1788 | } | |
1789 | asoc = new_asoc; | |
409b95af VY |
1790 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1791 | if (err < 0) { | |
1792 | err = -ENOMEM; | |
1793 | goto out_free; | |
1794 | } | |
1da177e4 LT |
1795 | |
1796 | /* If the SCTP_INIT ancillary data is specified, set all | |
1797 | * the association init values accordingly. | |
1798 | */ | |
1799 | if (sinit) { | |
1800 | if (sinit->sinit_num_ostreams) { | |
1801 | asoc->c.sinit_num_ostreams = | |
1802 | sinit->sinit_num_ostreams; | |
1803 | } | |
1804 | if (sinit->sinit_max_instreams) { | |
1805 | asoc->c.sinit_max_instreams = | |
1806 | sinit->sinit_max_instreams; | |
1807 | } | |
1808 | if (sinit->sinit_max_attempts) { | |
1809 | asoc->max_init_attempts | |
1810 | = sinit->sinit_max_attempts; | |
1811 | } | |
1812 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1813 | asoc->max_init_timeo = |
1da177e4 LT |
1814 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1815 | } | |
1816 | } | |
1817 | ||
1818 | /* Prime the peer's transport structures. */ | |
dce116ae | 1819 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1820 | if (!transport) { |
1821 | err = -ENOMEM; | |
1822 | goto out_free; | |
1823 | } | |
1da177e4 LT |
1824 | } |
1825 | ||
1826 | /* ASSERT: we have a valid association at this point. */ | |
1827 | SCTP_DEBUG_PRINTK("We have a valid association.\n"); | |
1828 | ||
1829 | if (!sinfo) { | |
1830 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1831 | * some defaults. | |
1832 | */ | |
517aa0bc | 1833 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1834 | default_sinfo.sinfo_stream = asoc->default_stream; |
1835 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1836 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1837 | default_sinfo.sinfo_context = asoc->default_context; | |
1838 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1839 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1840 | sinfo = &default_sinfo; | |
1841 | } | |
1842 | ||
1843 | /* API 7.1.7, the sndbuf size per association bounds the | |
1844 | * maximum size of data that can be sent in a single send call. | |
1845 | */ | |
1846 | if (msg_len > sk->sk_sndbuf) { | |
1847 | err = -EMSGSIZE; | |
1848 | goto out_free; | |
1849 | } | |
1850 | ||
8a479491 VY |
1851 | if (asoc->pmtu_pending) |
1852 | sctp_assoc_pending_pmtu(asoc); | |
1853 | ||
1da177e4 LT |
1854 | /* If fragmentation is disabled and the message length exceeds the |
1855 | * association fragmentation point, return EMSGSIZE. The I-D | |
1856 | * does not specify what this error is, but this looks like | |
1857 | * a great fit. | |
1858 | */ | |
1859 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1860 | err = -EMSGSIZE; | |
1861 | goto out_free; | |
1862 | } | |
1863 | ||
afd7614c JP |
1864 | /* Check for invalid stream. */ |
1865 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1866 | err = -EINVAL; | |
1867 | goto out_free; | |
1da177e4 LT |
1868 | } |
1869 | ||
1870 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1871 | if (!sctp_wspace(asoc)) { | |
1872 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1873 | if (err) | |
1874 | goto out_free; | |
1875 | } | |
1876 | ||
1877 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1878 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1879 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1880 | */ |
1881 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1882 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1883 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1884 | if (!chunk_tp) { |
1885 | err = -EINVAL; | |
1886 | goto out_free; | |
1887 | } | |
1888 | } else | |
1889 | chunk_tp = NULL; | |
1890 | ||
1891 | /* Auto-connect, if we aren't connected already. */ | |
1892 | if (sctp_state(asoc, CLOSED)) { | |
1893 | err = sctp_primitive_ASSOCIATE(asoc, NULL); | |
1894 | if (err < 0) | |
1895 | goto out_free; | |
1896 | SCTP_DEBUG_PRINTK("We associated primitively.\n"); | |
1897 | } | |
1898 | ||
1899 | /* Break the message into multiple chunks of maximum size. */ | |
1900 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
1901 | if (!datamsg) { | |
1902 | err = -ENOMEM; | |
1903 | goto out_free; | |
1904 | } | |
1905 | ||
1906 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1907 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
80445cfb | 1908 | sctp_chunk_hold(chunk); |
1da177e4 LT |
1909 | |
1910 | /* Do accounting for the write space. */ | |
1911 | sctp_set_owner_w(chunk); | |
1912 | ||
1913 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1914 | } |
1915 | ||
9c5c62be VY |
1916 | /* Send it to the lower layers. Note: all chunks |
1917 | * must either fail or succeed. The lower layer | |
1918 | * works that way today. Keep it that way or this | |
1919 | * breaks. | |
1920 | */ | |
1921 | err = sctp_primitive_SEND(asoc, datamsg); | |
1922 | /* Did the lower layer accept the chunk? */ | |
1923 | if (err) | |
1924 | sctp_datamsg_free(datamsg); | |
1925 | else | |
1926 | sctp_datamsg_put(datamsg); | |
1927 | ||
1928 | SCTP_DEBUG_PRINTK("We sent primitively.\n"); | |
1929 | ||
1da177e4 LT |
1930 | if (err) |
1931 | goto out_free; | |
1932 | else | |
1933 | err = msg_len; | |
1934 | ||
1935 | /* If we are already past ASSOCIATE, the lower | |
1936 | * layers are responsible for association cleanup. | |
1937 | */ | |
1938 | goto out_unlock; | |
1939 | ||
1940 | out_free: | |
1941 | if (new_asoc) | |
1942 | sctp_association_free(asoc); | |
1943 | out_unlock: | |
1944 | sctp_release_sock(sk); | |
1945 | ||
1946 | out_nounlock: | |
1947 | return sctp_error(sk, msg_flags, err); | |
1948 | ||
1949 | #if 0 | |
1950 | do_sock_err: | |
1951 | if (msg_len) | |
1952 | err = msg_len; | |
1953 | else | |
1954 | err = sock_error(sk); | |
1955 | goto out; | |
1956 | ||
1957 | do_interrupted: | |
1958 | if (msg_len) | |
1959 | err = msg_len; | |
1960 | goto out; | |
1961 | #endif /* 0 */ | |
1962 | } | |
1963 | ||
1964 | /* This is an extended version of skb_pull() that removes the data from the | |
1965 | * start of a skb even when data is spread across the list of skb's in the | |
1966 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1967 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1968 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1969 | * could not be removed. | |
1970 | */ | |
1971 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1972 | { | |
1973 | struct sk_buff *list; | |
1974 | int skb_len = skb_headlen(skb); | |
1975 | int rlen; | |
1976 | ||
1977 | if (len <= skb_len) { | |
1978 | __skb_pull(skb, len); | |
1979 | return 0; | |
1980 | } | |
1981 | len -= skb_len; | |
1982 | __skb_pull(skb, skb_len); | |
1983 | ||
1b003be3 | 1984 | skb_walk_frags(skb, list) { |
1da177e4 LT |
1985 | rlen = sctp_skb_pull(list, len); |
1986 | skb->len -= (len-rlen); | |
1987 | skb->data_len -= (len-rlen); | |
1988 | ||
1989 | if (!rlen) | |
1990 | return 0; | |
1991 | ||
1992 | len = rlen; | |
1993 | } | |
1994 | ||
1995 | return len; | |
1996 | } | |
1997 | ||
1998 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
1999 | * | |
2000 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
2001 | * int flags); | |
2002 | * | |
2003 | * socket - the socket descriptor of the endpoint. | |
2004 | * message - pointer to the msghdr structure which contains a single | |
2005 | * user message and possibly some ancillary data. | |
2006 | * | |
2007 | * See Section 5 for complete description of the data | |
2008 | * structures. | |
2009 | * | |
2010 | * flags - flags sent or received with the user message, see Section | |
2011 | * 5 for complete description of the flags. | |
2012 | */ | |
2013 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
2014 | ||
2015 | SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, | |
2016 | struct msghdr *msg, size_t len, int noblock, | |
2017 | int flags, int *addr_len) | |
2018 | { | |
2019 | struct sctp_ulpevent *event = NULL; | |
2020 | struct sctp_sock *sp = sctp_sk(sk); | |
2021 | struct sk_buff *skb; | |
2022 | int copied; | |
2023 | int err = 0; | |
2024 | int skb_len; | |
2025 | ||
2026 | SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: " | |
2027 | "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg, | |
2028 | "len", len, "knoblauch", noblock, | |
2029 | "flags", flags, "addr_len", addr_len); | |
2030 | ||
2031 | sctp_lock_sock(sk); | |
2032 | ||
2033 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
2034 | err = -ENOTCONN; | |
2035 | goto out; | |
2036 | } | |
2037 | ||
2038 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
2039 | if (!skb) | |
2040 | goto out; | |
2041 | ||
2042 | /* Get the total length of the skb including any skb's in the | |
2043 | * frag_list. | |
2044 | */ | |
2045 | skb_len = skb->len; | |
2046 | ||
2047 | copied = skb_len; | |
2048 | if (copied > len) | |
2049 | copied = len; | |
2050 | ||
2051 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2052 | ||
2053 | event = sctp_skb2event(skb); | |
2054 | ||
2055 | if (err) | |
2056 | goto out_free; | |
2057 | ||
3b885787 | 2058 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2059 | if (sctp_ulpevent_is_notification(event)) { |
2060 | msg->msg_flags |= MSG_NOTIFICATION; | |
2061 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
2062 | } else { | |
2063 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
2064 | } | |
2065 | ||
2066 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
2067 | if (sp->subscribe.sctp_data_io_event) | |
2068 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
2069 | #if 0 | |
2070 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
2071 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
2072 | ip_cmsg_recv(msg, skb); | |
2073 | #endif | |
2074 | ||
2075 | err = copied; | |
2076 | ||
2077 | /* If skb's length exceeds the user's buffer, update the skb and | |
2078 | * push it back to the receive_queue so that the next call to | |
2079 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2080 | */ | |
2081 | if (skb_len > copied) { | |
2082 | msg->msg_flags &= ~MSG_EOR; | |
2083 | if (flags & MSG_PEEK) | |
2084 | goto out_free; | |
2085 | sctp_skb_pull(skb, copied); | |
2086 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2087 | ||
2088 | /* When only partial message is copied to the user, increase | |
2089 | * rwnd by that amount. If all the data in the skb is read, | |
2090 | * rwnd is updated when the event is freed. | |
2091 | */ | |
0eca8fee VY |
2092 | if (!sctp_ulpevent_is_notification(event)) |
2093 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2094 | goto out; |
2095 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2096 | (event->msg_flags & MSG_EOR)) | |
2097 | msg->msg_flags |= MSG_EOR; | |
2098 | else | |
2099 | msg->msg_flags &= ~MSG_EOR; | |
2100 | ||
2101 | out_free: | |
2102 | if (flags & MSG_PEEK) { | |
2103 | /* Release the skb reference acquired after peeking the skb in | |
2104 | * sctp_skb_recv_datagram(). | |
2105 | */ | |
2106 | kfree_skb(skb); | |
2107 | } else { | |
2108 | /* Free the event which includes releasing the reference to | |
2109 | * the owner of the skb, freeing the skb and updating the | |
2110 | * rwnd. | |
2111 | */ | |
2112 | sctp_ulpevent_free(event); | |
2113 | } | |
2114 | out: | |
2115 | sctp_release_sock(sk); | |
2116 | return err; | |
2117 | } | |
2118 | ||
2119 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2120 | * | |
2121 | * This option is a on/off flag. If enabled no SCTP message | |
2122 | * fragmentation will be performed. Instead if a message being sent | |
2123 | * exceeds the current PMTU size, the message will NOT be sent and | |
2124 | * instead a error will be indicated to the user. | |
2125 | */ | |
2126 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2127 | char __user *optval, |
2128 | unsigned int optlen) | |
1da177e4 LT |
2129 | { |
2130 | int val; | |
2131 | ||
2132 | if (optlen < sizeof(int)) | |
2133 | return -EINVAL; | |
2134 | ||
2135 | if (get_user(val, (int __user *)optval)) | |
2136 | return -EFAULT; | |
2137 | ||
2138 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2139 | ||
2140 | return 0; | |
2141 | } | |
2142 | ||
2143 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2144 | unsigned int optlen) |
1da177e4 | 2145 | { |
7e8616d8 | 2146 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2147 | return -EINVAL; |
2148 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2149 | return -EFAULT; | |
2150 | return 0; | |
2151 | } | |
2152 | ||
2153 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2154 | * | |
2155 | * This socket option is applicable to the UDP-style socket only. When | |
2156 | * set it will cause associations that are idle for more than the | |
2157 | * specified number of seconds to automatically close. An association | |
2158 | * being idle is defined an association that has NOT sent or received | |
2159 | * user data. The special value of '0' indicates that no automatic | |
2160 | * close of any associations should be performed. The option expects an | |
2161 | * integer defining the number of seconds of idle time before an | |
2162 | * association is closed. | |
2163 | */ | |
2164 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2165 | unsigned int optlen) |
1da177e4 LT |
2166 | { |
2167 | struct sctp_sock *sp = sctp_sk(sk); | |
2168 | ||
2169 | /* Applicable to UDP-style socket only */ | |
2170 | if (sctp_style(sk, TCP)) | |
2171 | return -EOPNOTSUPP; | |
2172 | if (optlen != sizeof(int)) | |
2173 | return -EINVAL; | |
2174 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2175 | return -EFAULT; | |
f6778aab | 2176 | /* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */ |
8ffd3208 | 2177 | sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ); |
1da177e4 | 2178 | |
1da177e4 LT |
2179 | return 0; |
2180 | } | |
2181 | ||
2182 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2183 | * | |
2184 | * Applications can enable or disable heartbeats for any peer address of | |
2185 | * an association, modify an address's heartbeat interval, force a | |
2186 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2187 | * number of retransmissions sent before an address is considered | |
2188 | * unreachable. The following structure is used to access and modify an | |
2189 | * address's parameters: | |
2190 | * | |
2191 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2192 | * sctp_assoc_t spp_assoc_id; |
2193 | * struct sockaddr_storage spp_address; | |
2194 | * uint32_t spp_hbinterval; | |
2195 | * uint16_t spp_pathmaxrxt; | |
2196 | * uint32_t spp_pathmtu; | |
2197 | * uint32_t spp_sackdelay; | |
2198 | * uint32_t spp_flags; | |
2199 | * }; | |
2200 | * | |
2201 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2202 | * application, and identifies the association for | |
2203 | * this query. | |
1da177e4 LT |
2204 | * spp_address - This specifies which address is of interest. |
2205 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2206 | * in milliseconds. If a value of zero |
2207 | * is present in this field then no changes are to | |
2208 | * be made to this parameter. | |
1da177e4 LT |
2209 | * spp_pathmaxrxt - This contains the maximum number of |
2210 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2211 | * considered unreachable. If a value of zero |
2212 | * is present in this field then no changes are to | |
2213 | * be made to this parameter. | |
2214 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2215 | * specified here will be the "fixed" path mtu. | |
2216 | * Note that if the spp_address field is empty | |
2217 | * then all associations on this address will | |
2218 | * have this fixed path mtu set upon them. | |
2219 | * | |
2220 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2221 | * the number of milliseconds that sacks will be delayed | |
2222 | * for. This value will apply to all addresses of an | |
2223 | * association if the spp_address field is empty. Note | |
2224 | * also, that if delayed sack is enabled and this | |
2225 | * value is set to 0, no change is made to the last | |
2226 | * recorded delayed sack timer value. | |
2227 | * | |
2228 | * spp_flags - These flags are used to control various features | |
2229 | * on an association. The flag field may contain | |
2230 | * zero or more of the following options. | |
2231 | * | |
2232 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2233 | * specified address. Note that if the address | |
2234 | * field is empty all addresses for the association | |
2235 | * have heartbeats enabled upon them. | |
2236 | * | |
2237 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2238 | * speicifed address. Note that if the address | |
2239 | * field is empty all addresses for the association | |
2240 | * will have their heartbeats disabled. Note also | |
2241 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2242 | * mutually exclusive, only one of these two should | |
2243 | * be specified. Enabling both fields will have | |
2244 | * undetermined results. | |
2245 | * | |
2246 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2247 | * to be made immediately. | |
2248 | * | |
bdf3092a VY |
2249 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2250 | * heartbeat delayis to be set to the value of 0 | |
2251 | * milliseconds. | |
2252 | * | |
52ccb8e9 FF |
2253 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2254 | * discovery upon the specified address. Note that | |
2255 | * if the address feild is empty then all addresses | |
2256 | * on the association are effected. | |
2257 | * | |
2258 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2259 | * discovery upon the specified address. Note that | |
2260 | * if the address feild is empty then all addresses | |
2261 | * on the association are effected. Not also that | |
2262 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2263 | * exclusive. Enabling both will have undetermined | |
2264 | * results. | |
2265 | * | |
2266 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2267 | * on delayed sack. The time specified in spp_sackdelay | |
2268 | * is used to specify the sack delay for this address. Note | |
2269 | * that if spp_address is empty then all addresses will | |
2270 | * enable delayed sack and take on the sack delay | |
2271 | * value specified in spp_sackdelay. | |
2272 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2273 | * off delayed sack. If the spp_address field is blank then | |
2274 | * delayed sack is disabled for the entire association. Note | |
2275 | * also that this field is mutually exclusive to | |
2276 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2277 | * results. | |
1da177e4 | 2278 | */ |
16164366 AB |
2279 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2280 | struct sctp_transport *trans, | |
2281 | struct sctp_association *asoc, | |
2282 | struct sctp_sock *sp, | |
2283 | int hb_change, | |
2284 | int pmtud_change, | |
2285 | int sackdelay_change) | |
52ccb8e9 FF |
2286 | { |
2287 | int error; | |
2288 | ||
2289 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
2290 | error = sctp_primitive_REQUESTHEARTBEAT (trans->asoc, trans); | |
2291 | if (error) | |
2292 | return error; | |
2293 | } | |
2294 | ||
bdf3092a VY |
2295 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2296 | * this field is ignored. Note also that a value of zero indicates | |
2297 | * the current setting should be left unchanged. | |
2298 | */ | |
2299 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2300 | ||
2301 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2302 | * set. This lets us use 0 value when this flag | |
2303 | * is set. | |
2304 | */ | |
2305 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2306 | params->spp_hbinterval = 0; | |
2307 | ||
2308 | if (params->spp_hbinterval || | |
2309 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2310 | if (trans) { | |
2311 | trans->hbinterval = | |
2312 | msecs_to_jiffies(params->spp_hbinterval); | |
2313 | } else if (asoc) { | |
2314 | asoc->hbinterval = | |
2315 | msecs_to_jiffies(params->spp_hbinterval); | |
2316 | } else { | |
2317 | sp->hbinterval = params->spp_hbinterval; | |
2318 | } | |
52ccb8e9 FF |
2319 | } |
2320 | } | |
2321 | ||
2322 | if (hb_change) { | |
2323 | if (trans) { | |
2324 | trans->param_flags = | |
2325 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2326 | } else if (asoc) { | |
2327 | asoc->param_flags = | |
2328 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2329 | } else { | |
2330 | sp->param_flags = | |
2331 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2332 | } | |
2333 | } | |
2334 | ||
bdf3092a VY |
2335 | /* When Path MTU discovery is disabled the value specified here will |
2336 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2337 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2338 | * effect). | |
2339 | */ | |
2340 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2341 | if (trans) { |
2342 | trans->pathmtu = params->spp_pathmtu; | |
2343 | sctp_assoc_sync_pmtu(asoc); | |
2344 | } else if (asoc) { | |
2345 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2346 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2347 | } else { |
2348 | sp->pathmtu = params->spp_pathmtu; | |
2349 | } | |
2350 | } | |
2351 | ||
2352 | if (pmtud_change) { | |
2353 | if (trans) { | |
2354 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2355 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2356 | trans->param_flags = | |
2357 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2358 | if (update) { | |
9914ae3c | 2359 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
52ccb8e9 FF |
2360 | sctp_assoc_sync_pmtu(asoc); |
2361 | } | |
2362 | } else if (asoc) { | |
2363 | asoc->param_flags = | |
2364 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2365 | } else { | |
2366 | sp->param_flags = | |
2367 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2368 | } | |
2369 | } | |
2370 | ||
bdf3092a VY |
2371 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2372 | * value of this field is ignored. Note also that a value of zero | |
2373 | * indicates the current setting should be left unchanged. | |
2374 | */ | |
2375 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2376 | if (trans) { |
2377 | trans->sackdelay = | |
2378 | msecs_to_jiffies(params->spp_sackdelay); | |
2379 | } else if (asoc) { | |
2380 | asoc->sackdelay = | |
2381 | msecs_to_jiffies(params->spp_sackdelay); | |
2382 | } else { | |
2383 | sp->sackdelay = params->spp_sackdelay; | |
2384 | } | |
2385 | } | |
2386 | ||
2387 | if (sackdelay_change) { | |
2388 | if (trans) { | |
2389 | trans->param_flags = | |
2390 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2391 | sackdelay_change; | |
2392 | } else if (asoc) { | |
2393 | asoc->param_flags = | |
2394 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2395 | sackdelay_change; | |
2396 | } else { | |
2397 | sp->param_flags = | |
2398 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2399 | sackdelay_change; | |
2400 | } | |
2401 | } | |
2402 | ||
37051f73 APO |
2403 | /* Note that a value of zero indicates the current setting should be |
2404 | left unchanged. | |
bdf3092a | 2405 | */ |
37051f73 | 2406 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2407 | if (trans) { |
2408 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2409 | } else if (asoc) { | |
2410 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2411 | } else { | |
2412 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2413 | } | |
2414 | } | |
2415 | ||
2416 | return 0; | |
2417 | } | |
2418 | ||
1da177e4 | 2419 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2420 | char __user *optval, |
2421 | unsigned int optlen) | |
1da177e4 | 2422 | { |
52ccb8e9 FF |
2423 | struct sctp_paddrparams params; |
2424 | struct sctp_transport *trans = NULL; | |
2425 | struct sctp_association *asoc = NULL; | |
2426 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2427 | int error; |
52ccb8e9 | 2428 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2429 | |
2430 | if (optlen != sizeof(struct sctp_paddrparams)) | |
52ccb8e9 FF |
2431 | return - EINVAL; |
2432 | ||
1da177e4 LT |
2433 | if (copy_from_user(¶ms, optval, optlen)) |
2434 | return -EFAULT; | |
2435 | ||
52ccb8e9 FF |
2436 | /* Validate flags and value parameters. */ |
2437 | hb_change = params.spp_flags & SPP_HB; | |
2438 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2439 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2440 | ||
2441 | if (hb_change == SPP_HB || | |
2442 | pmtud_change == SPP_PMTUD || | |
2443 | sackdelay_change == SPP_SACKDELAY || | |
2444 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2445 | (params.spp_pathmtu && |
2446 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2447 | return -EINVAL; |
1da177e4 | 2448 | |
52ccb8e9 FF |
2449 | /* If an address other than INADDR_ANY is specified, and |
2450 | * no transport is found, then the request is invalid. | |
2451 | */ | |
52cae8f0 | 2452 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2453 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2454 | params.spp_assoc_id); | |
2455 | if (!trans) | |
1da177e4 | 2456 | return -EINVAL; |
1da177e4 LT |
2457 | } |
2458 | ||
52ccb8e9 FF |
2459 | /* Get association, if assoc_id != 0 and the socket is a one |
2460 | * to many style socket, and an association was not found, then | |
2461 | * the id was invalid. | |
2462 | */ | |
2463 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2464 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2465 | return -EINVAL; |
2466 | ||
52ccb8e9 FF |
2467 | /* Heartbeat demand can only be sent on a transport or |
2468 | * association, but not a socket. | |
1da177e4 | 2469 | */ |
52ccb8e9 FF |
2470 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2471 | return -EINVAL; | |
2472 | ||
2473 | /* Process parameters. */ | |
2474 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2475 | hb_change, pmtud_change, | |
2476 | sackdelay_change); | |
1da177e4 | 2477 | |
52ccb8e9 FF |
2478 | if (error) |
2479 | return error; | |
2480 | ||
2481 | /* If changes are for association, also apply parameters to each | |
2482 | * transport. | |
1da177e4 | 2483 | */ |
52ccb8e9 | 2484 | if (!trans && asoc) { |
9dbc15f0 RD |
2485 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2486 | transports) { | |
52ccb8e9 FF |
2487 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2488 | hb_change, pmtud_change, | |
2489 | sackdelay_change); | |
2490 | } | |
2491 | } | |
1da177e4 LT |
2492 | |
2493 | return 0; | |
2494 | } | |
2495 | ||
d364d927 WY |
2496 | /* |
2497 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2498 | * | |
2499 | * This option will effect the way delayed acks are performed. This | |
2500 | * option allows you to get or set the delayed ack time, in | |
2501 | * milliseconds. It also allows changing the delayed ack frequency. | |
2502 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2503 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2504 | * values. If the assoc_id field is non-zero, then the set or get | |
2505 | * effects the specified association for the one to many model (the | |
2506 | * assoc_id field is ignored by the one to one model). Note that if | |
2507 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2508 | * current values will remain unchanged. | |
2509 | * | |
2510 | * struct sctp_sack_info { | |
2511 | * sctp_assoc_t sack_assoc_id; | |
2512 | * uint32_t sack_delay; | |
2513 | * uint32_t sack_freq; | |
2514 | * }; | |
2515 | * | |
2516 | * sack_assoc_id - This parameter, indicates which association the user | |
2517 | * is performing an action upon. Note that if this field's value is | |
2518 | * zero then the endpoints default value is changed (effecting future | |
2519 | * associations only). | |
2520 | * | |
2521 | * sack_delay - This parameter contains the number of milliseconds that | |
2522 | * the user is requesting the delayed ACK timer be set to. Note that | |
2523 | * this value is defined in the standard to be between 200 and 500 | |
2524 | * milliseconds. | |
2525 | * | |
2526 | * sack_freq - This parameter contains the number of packets that must | |
2527 | * be received before a sack is sent without waiting for the delay | |
2528 | * timer to expire. The default value for this is 2, setting this | |
2529 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2530 | */ |
2531 | ||
d364d927 | 2532 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2533 | char __user *optval, unsigned int optlen) |
7708610b | 2534 | { |
d364d927 | 2535 | struct sctp_sack_info params; |
7708610b FF |
2536 | struct sctp_transport *trans = NULL; |
2537 | struct sctp_association *asoc = NULL; | |
2538 | struct sctp_sock *sp = sctp_sk(sk); | |
2539 | ||
d364d927 WY |
2540 | if (optlen == sizeof(struct sctp_sack_info)) { |
2541 | if (copy_from_user(¶ms, optval, optlen)) | |
2542 | return -EFAULT; | |
7708610b | 2543 | |
d364d927 WY |
2544 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2545 | return 0; | |
2546 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
2547 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
2548 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
2549 | if (copy_from_user(¶ms, optval, optlen)) |
2550 | return -EFAULT; | |
2551 | ||
2552 | if (params.sack_delay == 0) | |
2553 | params.sack_freq = 1; | |
2554 | else | |
2555 | params.sack_freq = 0; | |
2556 | } else | |
2557 | return - EINVAL; | |
7708610b FF |
2558 | |
2559 | /* Validate value parameter. */ | |
d364d927 | 2560 | if (params.sack_delay > 500) |
7708610b FF |
2561 | return -EINVAL; |
2562 | ||
d364d927 | 2563 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2564 | * to many style socket, and an association was not found, then |
2565 | * the id was invalid. | |
d808ad9a | 2566 | */ |
d364d927 WY |
2567 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2568 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2569 | return -EINVAL; |
2570 | ||
d364d927 | 2571 | if (params.sack_delay) { |
7708610b FF |
2572 | if (asoc) { |
2573 | asoc->sackdelay = | |
d364d927 | 2574 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2575 | asoc->param_flags = |
7708610b FF |
2576 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2577 | SPP_SACKDELAY_ENABLE; | |
2578 | } else { | |
d364d927 | 2579 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2580 | sp->param_flags = |
7708610b FF |
2581 | (sp->param_flags & ~SPP_SACKDELAY) | |
2582 | SPP_SACKDELAY_ENABLE; | |
2583 | } | |
d364d927 WY |
2584 | } |
2585 | ||
2586 | if (params.sack_freq == 1) { | |
7708610b | 2587 | if (asoc) { |
d808ad9a | 2588 | asoc->param_flags = |
7708610b FF |
2589 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2590 | SPP_SACKDELAY_DISABLE; | |
2591 | } else { | |
d808ad9a | 2592 | sp->param_flags = |
7708610b FF |
2593 | (sp->param_flags & ~SPP_SACKDELAY) | |
2594 | SPP_SACKDELAY_DISABLE; | |
2595 | } | |
d364d927 WY |
2596 | } else if (params.sack_freq > 1) { |
2597 | if (asoc) { | |
2598 | asoc->sackfreq = params.sack_freq; | |
2599 | asoc->param_flags = | |
2600 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2601 | SPP_SACKDELAY_ENABLE; | |
2602 | } else { | |
2603 | sp->sackfreq = params.sack_freq; | |
2604 | sp->param_flags = | |
2605 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2606 | SPP_SACKDELAY_ENABLE; | |
2607 | } | |
7708610b FF |
2608 | } |
2609 | ||
2610 | /* If change is for association, also apply to each transport. */ | |
2611 | if (asoc) { | |
9dbc15f0 RD |
2612 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2613 | transports) { | |
d364d927 | 2614 | if (params.sack_delay) { |
7708610b | 2615 | trans->sackdelay = |
d364d927 | 2616 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2617 | trans->param_flags = |
7708610b FF |
2618 | (trans->param_flags & ~SPP_SACKDELAY) | |
2619 | SPP_SACKDELAY_ENABLE; | |
d364d927 | 2620 | } |
7bfe8bdb | 2621 | if (params.sack_freq == 1) { |
d808ad9a | 2622 | trans->param_flags = |
7708610b FF |
2623 | (trans->param_flags & ~SPP_SACKDELAY) | |
2624 | SPP_SACKDELAY_DISABLE; | |
d364d927 WY |
2625 | } else if (params.sack_freq > 1) { |
2626 | trans->sackfreq = params.sack_freq; | |
2627 | trans->param_flags = | |
2628 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2629 | SPP_SACKDELAY_ENABLE; | |
7708610b FF |
2630 | } |
2631 | } | |
2632 | } | |
d808ad9a | 2633 | |
7708610b FF |
2634 | return 0; |
2635 | } | |
2636 | ||
1da177e4 LT |
2637 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2638 | * | |
2639 | * Applications can specify protocol parameters for the default association | |
2640 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2641 | * is SCTP_INITMSG. | |
2642 | * | |
2643 | * Setting initialization parameters is effective only on an unconnected | |
2644 | * socket (for UDP-style sockets only future associations are effected | |
2645 | * by the change). With TCP-style sockets, this option is inherited by | |
2646 | * sockets derived from a listener socket. | |
2647 | */ | |
b7058842 | 2648 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2649 | { |
2650 | struct sctp_initmsg sinit; | |
2651 | struct sctp_sock *sp = sctp_sk(sk); | |
2652 | ||
2653 | if (optlen != sizeof(struct sctp_initmsg)) | |
2654 | return -EINVAL; | |
2655 | if (copy_from_user(&sinit, optval, optlen)) | |
2656 | return -EFAULT; | |
2657 | ||
2658 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2659 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2660 | if (sinit.sinit_max_instreams) |
d808ad9a | 2661 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2662 | if (sinit.sinit_max_attempts) |
d808ad9a | 2663 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2664 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2665 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2666 | |
2667 | return 0; | |
2668 | } | |
2669 | ||
2670 | /* | |
2671 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2672 | * | |
2673 | * Applications that wish to use the sendto() system call may wish to | |
2674 | * specify a default set of parameters that would normally be supplied | |
2675 | * through the inclusion of ancillary data. This socket option allows | |
2676 | * such an application to set the default sctp_sndrcvinfo structure. | |
2677 | * The application that wishes to use this socket option simply passes | |
2678 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2679 | * 5.2.2) The input parameters accepted by this call include | |
2680 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2681 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2682 | * to this call if the caller is using the UDP model. | |
2683 | */ | |
2684 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2685 | char __user *optval, |
2686 | unsigned int optlen) | |
1da177e4 LT |
2687 | { |
2688 | struct sctp_sndrcvinfo info; | |
2689 | struct sctp_association *asoc; | |
2690 | struct sctp_sock *sp = sctp_sk(sk); | |
2691 | ||
2692 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2693 | return -EINVAL; | |
2694 | if (copy_from_user(&info, optval, optlen)) | |
2695 | return -EFAULT; | |
2696 | ||
2697 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2698 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2699 | return -EINVAL; | |
2700 | ||
2701 | if (asoc) { | |
2702 | asoc->default_stream = info.sinfo_stream; | |
2703 | asoc->default_flags = info.sinfo_flags; | |
2704 | asoc->default_ppid = info.sinfo_ppid; | |
2705 | asoc->default_context = info.sinfo_context; | |
2706 | asoc->default_timetolive = info.sinfo_timetolive; | |
2707 | } else { | |
2708 | sp->default_stream = info.sinfo_stream; | |
2709 | sp->default_flags = info.sinfo_flags; | |
2710 | sp->default_ppid = info.sinfo_ppid; | |
2711 | sp->default_context = info.sinfo_context; | |
2712 | sp->default_timetolive = info.sinfo_timetolive; | |
2713 | } | |
2714 | ||
2715 | return 0; | |
2716 | } | |
2717 | ||
2718 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2719 | * | |
2720 | * Requests that the local SCTP stack use the enclosed peer address as | |
2721 | * the association primary. The enclosed address must be one of the | |
2722 | * association peer's addresses. | |
2723 | */ | |
2724 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2725 | unsigned int optlen) |
1da177e4 LT |
2726 | { |
2727 | struct sctp_prim prim; | |
2728 | struct sctp_transport *trans; | |
2729 | ||
2730 | if (optlen != sizeof(struct sctp_prim)) | |
2731 | return -EINVAL; | |
2732 | ||
2733 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2734 | return -EFAULT; | |
2735 | ||
2736 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2737 | if (!trans) | |
2738 | return -EINVAL; | |
2739 | ||
2740 | sctp_assoc_set_primary(trans->asoc, trans); | |
2741 | ||
2742 | return 0; | |
2743 | } | |
2744 | ||
2745 | /* | |
2746 | * 7.1.5 SCTP_NODELAY | |
2747 | * | |
2748 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2749 | * generally sent as soon as possible and no unnecessary delays are | |
2750 | * introduced, at the cost of more packets in the network. Expects an | |
2751 | * integer boolean flag. | |
2752 | */ | |
2753 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2754 | unsigned int optlen) |
1da177e4 LT |
2755 | { |
2756 | int val; | |
2757 | ||
2758 | if (optlen < sizeof(int)) | |
2759 | return -EINVAL; | |
2760 | if (get_user(val, (int __user *)optval)) | |
2761 | return -EFAULT; | |
2762 | ||
2763 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2764 | return 0; | |
2765 | } | |
2766 | ||
2767 | /* | |
2768 | * | |
2769 | * 7.1.1 SCTP_RTOINFO | |
2770 | * | |
2771 | * The protocol parameters used to initialize and bound retransmission | |
2772 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2773 | * and modify these parameters. | |
2774 | * All parameters are time values, in milliseconds. A value of 0, when | |
2775 | * modifying the parameters, indicates that the current value should not | |
2776 | * be changed. | |
2777 | * | |
2778 | */ | |
b7058842 DM |
2779 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2780 | { | |
1da177e4 LT |
2781 | struct sctp_rtoinfo rtoinfo; |
2782 | struct sctp_association *asoc; | |
2783 | ||
2784 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2785 | return -EINVAL; | |
2786 | ||
2787 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2788 | return -EFAULT; | |
2789 | ||
2790 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2791 | ||
2792 | /* Set the values to the specific association */ | |
2793 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2794 | return -EINVAL; | |
2795 | ||
2796 | if (asoc) { | |
2797 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2798 | asoc->rto_initial = |
1da177e4 LT |
2799 | msecs_to_jiffies(rtoinfo.srto_initial); |
2800 | if (rtoinfo.srto_max != 0) | |
2801 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2802 | if (rtoinfo.srto_min != 0) | |
2803 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2804 | } else { | |
2805 | /* If there is no association or the association-id = 0 | |
2806 | * set the values to the endpoint. | |
2807 | */ | |
2808 | struct sctp_sock *sp = sctp_sk(sk); | |
2809 | ||
2810 | if (rtoinfo.srto_initial != 0) | |
2811 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2812 | if (rtoinfo.srto_max != 0) | |
2813 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2814 | if (rtoinfo.srto_min != 0) | |
2815 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2816 | } | |
2817 | ||
2818 | return 0; | |
2819 | } | |
2820 | ||
2821 | /* | |
2822 | * | |
2823 | * 7.1.2 SCTP_ASSOCINFO | |
2824 | * | |
59c51591 | 2825 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2826 | * of the association. |
2827 | * Returns an error if the new association retransmission value is | |
2828 | * greater than the sum of the retransmission value of the peer. | |
2829 | * See [SCTP] for more information. | |
2830 | * | |
2831 | */ | |
b7058842 | 2832 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2833 | { |
2834 | ||
2835 | struct sctp_assocparams assocparams; | |
2836 | struct sctp_association *asoc; | |
2837 | ||
2838 | if (optlen != sizeof(struct sctp_assocparams)) | |
2839 | return -EINVAL; | |
2840 | if (copy_from_user(&assocparams, optval, optlen)) | |
2841 | return -EFAULT; | |
2842 | ||
2843 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2844 | ||
2845 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2846 | return -EINVAL; | |
2847 | ||
2848 | /* Set the values to the specific association */ | |
2849 | if (asoc) { | |
402d68c4 VY |
2850 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2851 | __u32 path_sum = 0; | |
2852 | int paths = 0; | |
402d68c4 VY |
2853 | struct sctp_transport *peer_addr; |
2854 | ||
9dbc15f0 RD |
2855 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2856 | transports) { | |
402d68c4 VY |
2857 | path_sum += peer_addr->pathmaxrxt; |
2858 | paths++; | |
2859 | } | |
2860 | ||
025dfdaf | 2861 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2862 | * one path/transport. We do this because path |
2863 | * retransmissions are only counted when we have more | |
2864 | * then one path. | |
2865 | */ | |
2866 | if (paths > 1 && | |
2867 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2868 | return -EINVAL; | |
2869 | ||
1da177e4 | 2870 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2871 | } |
2872 | ||
1da177e4 LT |
2873 | if (assocparams.sasoc_cookie_life != 0) { |
2874 | asoc->cookie_life.tv_sec = | |
2875 | assocparams.sasoc_cookie_life / 1000; | |
2876 | asoc->cookie_life.tv_usec = | |
2877 | (assocparams.sasoc_cookie_life % 1000) | |
2878 | * 1000; | |
2879 | } | |
2880 | } else { | |
2881 | /* Set the values to the endpoint */ | |
2882 | struct sctp_sock *sp = sctp_sk(sk); | |
2883 | ||
2884 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2885 | sp->assocparams.sasoc_asocmaxrxt = | |
2886 | assocparams.sasoc_asocmaxrxt; | |
2887 | if (assocparams.sasoc_cookie_life != 0) | |
2888 | sp->assocparams.sasoc_cookie_life = | |
2889 | assocparams.sasoc_cookie_life; | |
2890 | } | |
2891 | return 0; | |
2892 | } | |
2893 | ||
2894 | /* | |
2895 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2896 | * | |
2897 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2898 | * addresses. If this option is turned on and the socket is type | |
2899 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2900 | * If this option is turned off, then no mapping will be done of V4 | |
2901 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2902 | * addresses on the socket. | |
2903 | */ | |
b7058842 | 2904 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2905 | { |
2906 | int val; | |
2907 | struct sctp_sock *sp = sctp_sk(sk); | |
2908 | ||
2909 | if (optlen < sizeof(int)) | |
2910 | return -EINVAL; | |
2911 | if (get_user(val, (int __user *)optval)) | |
2912 | return -EFAULT; | |
2913 | if (val) | |
2914 | sp->v4mapped = 1; | |
2915 | else | |
2916 | sp->v4mapped = 0; | |
2917 | ||
2918 | return 0; | |
2919 | } | |
2920 | ||
2921 | /* | |
e89c2095 WY |
2922 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2923 | * This option will get or set the maximum size to put in any outgoing | |
2924 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
2925 | * fragmented by SCTP into the specified size. Note that the underlying |
2926 | * SCTP implementation may fragment into smaller sized chunks when the | |
2927 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
2928 | * the user. The default value for this option is '0' which indicates |
2929 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2930 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2931 | * than the maximum size of an IP datagram will effectively let SCTP | |
2932 | * control fragmentation (i.e. the same as setting this option to 0). | |
2933 | * | |
2934 | * The following structure is used to access and modify this parameter: | |
2935 | * | |
2936 | * struct sctp_assoc_value { | |
2937 | * sctp_assoc_t assoc_id; | |
2938 | * uint32_t assoc_value; | |
2939 | * }; | |
2940 | * | |
2941 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2942 | * For one-to-many style sockets this parameter indicates which | |
2943 | * association the user is performing an action upon. Note that if | |
2944 | * this field's value is zero then the endpoints default value is | |
2945 | * changed (effecting future associations only). | |
2946 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 2947 | */ |
b7058842 | 2948 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 2949 | { |
e89c2095 | 2950 | struct sctp_assoc_value params; |
1da177e4 | 2951 | struct sctp_association *asoc; |
1da177e4 LT |
2952 | struct sctp_sock *sp = sctp_sk(sk); |
2953 | int val; | |
2954 | ||
e89c2095 | 2955 | if (optlen == sizeof(int)) { |
145ce502 JP |
2956 | pr_warn("Use of int in maxseg socket option deprecated\n"); |
2957 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
e89c2095 WY |
2958 | if (copy_from_user(&val, optval, optlen)) |
2959 | return -EFAULT; | |
2960 | params.assoc_id = 0; | |
2961 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2962 | if (copy_from_user(¶ms, optval, optlen)) | |
2963 | return -EFAULT; | |
2964 | val = params.assoc_value; | |
2965 | } else | |
1da177e4 | 2966 | return -EINVAL; |
e89c2095 | 2967 | |
96a33998 | 2968 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 2969 | return -EINVAL; |
1da177e4 | 2970 | |
e89c2095 WY |
2971 | asoc = sctp_id2assoc(sk, params.assoc_id); |
2972 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
2973 | return -EINVAL; | |
2974 | ||
2975 | if (asoc) { | |
2976 | if (val == 0) { | |
2977 | val = asoc->pathmtu; | |
2978 | val -= sp->pf->af->net_header_len; | |
2979 | val -= sizeof(struct sctphdr) + | |
2980 | sizeof(struct sctp_data_chunk); | |
2981 | } | |
f68b2e05 VY |
2982 | asoc->user_frag = val; |
2983 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
2984 | } else { |
2985 | sp->user_frag = val; | |
1da177e4 LT |
2986 | } |
2987 | ||
2988 | return 0; | |
2989 | } | |
2990 | ||
2991 | ||
2992 | /* | |
2993 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
2994 | * | |
2995 | * Requests that the peer mark the enclosed address as the association | |
2996 | * primary. The enclosed address must be one of the association's | |
2997 | * locally bound addresses. The following structure is used to make a | |
2998 | * set primary request: | |
2999 | */ | |
3000 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 3001 | unsigned int optlen) |
1da177e4 LT |
3002 | { |
3003 | struct sctp_sock *sp; | |
1da177e4 LT |
3004 | struct sctp_association *asoc = NULL; |
3005 | struct sctp_setpeerprim prim; | |
3006 | struct sctp_chunk *chunk; | |
40a01039 | 3007 | struct sctp_af *af; |
1da177e4 LT |
3008 | int err; |
3009 | ||
3010 | sp = sctp_sk(sk); | |
1da177e4 LT |
3011 | |
3012 | if (!sctp_addip_enable) | |
3013 | return -EPERM; | |
3014 | ||
3015 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
3016 | return -EINVAL; | |
3017 | ||
3018 | if (copy_from_user(&prim, optval, optlen)) | |
3019 | return -EFAULT; | |
3020 | ||
3021 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 3022 | if (!asoc) |
1da177e4 LT |
3023 | return -EINVAL; |
3024 | ||
3025 | if (!asoc->peer.asconf_capable) | |
3026 | return -EPERM; | |
3027 | ||
3028 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
3029 | return -EPERM; | |
3030 | ||
3031 | if (!sctp_state(asoc, ESTABLISHED)) | |
3032 | return -ENOTCONN; | |
3033 | ||
40a01039 WY |
3034 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
3035 | if (!af) | |
3036 | return -EINVAL; | |
3037 | ||
3038 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
3039 | return -EADDRNOTAVAIL; | |
3040 | ||
1da177e4 LT |
3041 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
3042 | return -EADDRNOTAVAIL; | |
3043 | ||
3044 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3045 | chunk = sctp_make_asconf_set_prim(asoc, | |
3046 | (union sctp_addr *)&prim.sspp_addr); | |
3047 | if (!chunk) | |
3048 | return -ENOMEM; | |
3049 | ||
3050 | err = sctp_send_asconf(asoc, chunk); | |
3051 | ||
3052 | SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n"); | |
3053 | ||
3054 | return err; | |
3055 | } | |
3056 | ||
0f3fffd8 | 3057 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3058 | unsigned int optlen) |
1da177e4 | 3059 | { |
0f3fffd8 | 3060 | struct sctp_setadaptation adaptation; |
1da177e4 | 3061 | |
0f3fffd8 | 3062 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3063 | return -EINVAL; |
0f3fffd8 | 3064 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3065 | return -EFAULT; |
3066 | ||
0f3fffd8 | 3067 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3068 | |
3069 | return 0; | |
3070 | } | |
3071 | ||
6ab792f5 ISJ |
3072 | /* |
3073 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3074 | * | |
3075 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3076 | * used when a failed message is retrieved holding the value that was | |
3077 | * sent down on the actual send call. This option allows the setting of | |
3078 | * a default context on an association basis that will be received on | |
3079 | * reading messages from the peer. This is especially helpful in the | |
3080 | * one-2-many model for an application to keep some reference to an | |
3081 | * internal state machine that is processing messages on the | |
3082 | * association. Note that the setting of this value only effects | |
3083 | * received messages from the peer and does not effect the value that is | |
3084 | * saved with outbound messages. | |
3085 | */ | |
3086 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3087 | unsigned int optlen) |
6ab792f5 ISJ |
3088 | { |
3089 | struct sctp_assoc_value params; | |
3090 | struct sctp_sock *sp; | |
3091 | struct sctp_association *asoc; | |
3092 | ||
3093 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3094 | return -EINVAL; | |
3095 | if (copy_from_user(¶ms, optval, optlen)) | |
3096 | return -EFAULT; | |
3097 | ||
3098 | sp = sctp_sk(sk); | |
3099 | ||
3100 | if (params.assoc_id != 0) { | |
3101 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3102 | if (!asoc) | |
3103 | return -EINVAL; | |
3104 | asoc->default_rcv_context = params.assoc_value; | |
3105 | } else { | |
3106 | sp->default_rcv_context = params.assoc_value; | |
3107 | } | |
3108 | ||
3109 | return 0; | |
3110 | } | |
3111 | ||
b6e1331f VY |
3112 | /* |
3113 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3114 | * | |
3115 | * This options will at a minimum specify if the implementation is doing | |
3116 | * fragmented interleave. Fragmented interleave, for a one to many | |
3117 | * socket, is when subsequent calls to receive a message may return | |
3118 | * parts of messages from different associations. Some implementations | |
3119 | * may allow you to turn this value on or off. If so, when turned off, | |
3120 | * no fragment interleave will occur (which will cause a head of line | |
3121 | * blocking amongst multiple associations sharing the same one to many | |
3122 | * socket). When this option is turned on, then each receive call may | |
3123 | * come from a different association (thus the user must receive data | |
3124 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3125 | * association each receive belongs to. | |
3126 | * | |
3127 | * This option takes a boolean value. A non-zero value indicates that | |
3128 | * fragmented interleave is on. A value of zero indicates that | |
3129 | * fragmented interleave is off. | |
3130 | * | |
3131 | * Note that it is important that an implementation that allows this | |
3132 | * option to be turned on, have it off by default. Otherwise an unaware | |
3133 | * application using the one to many model may become confused and act | |
3134 | * incorrectly. | |
3135 | */ | |
3136 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3137 | char __user *optval, | |
b7058842 | 3138 | unsigned int optlen) |
b6e1331f VY |
3139 | { |
3140 | int val; | |
3141 | ||
3142 | if (optlen != sizeof(int)) | |
3143 | return -EINVAL; | |
3144 | if (get_user(val, (int __user *)optval)) | |
3145 | return -EFAULT; | |
3146 | ||
3147 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3148 | ||
3149 | return 0; | |
3150 | } | |
3151 | ||
d49d91d7 | 3152 | /* |
8510b937 | 3153 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3154 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3155 | * |
d49d91d7 VY |
3156 | * This option will set or get the SCTP partial delivery point. This |
3157 | * point is the size of a message where the partial delivery API will be | |
3158 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3159 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3160 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3161 | * point. Note also that the call will fail if the user attempts to set |
3162 | * this value larger than the socket receive buffer size. | |
3163 | * | |
3164 | * Note that any single message having a length smaller than or equal to | |
3165 | * the SCTP partial delivery point will be delivered in one single read | |
3166 | * call as long as the user provided buffer is large enough to hold the | |
3167 | * message. | |
d49d91d7 VY |
3168 | */ |
3169 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3170 | char __user *optval, | |
b7058842 | 3171 | unsigned int optlen) |
d49d91d7 VY |
3172 | { |
3173 | u32 val; | |
3174 | ||
3175 | if (optlen != sizeof(u32)) | |
3176 | return -EINVAL; | |
3177 | if (get_user(val, (int __user *)optval)) | |
3178 | return -EFAULT; | |
3179 | ||
8510b937 WY |
3180 | /* Note: We double the receive buffer from what the user sets |
3181 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3182 | */ | |
3183 | if (val > (sk->sk_rcvbuf >> 1)) | |
3184 | return -EINVAL; | |
3185 | ||
d49d91d7 VY |
3186 | sctp_sk(sk)->pd_point = val; |
3187 | ||
3188 | return 0; /* is this the right error code? */ | |
3189 | } | |
3190 | ||
70331571 VY |
3191 | /* |
3192 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3193 | * | |
3194 | * This option will allow a user to change the maximum burst of packets | |
3195 | * that can be emitted by this association. Note that the default value | |
3196 | * is 4, and some implementations may restrict this setting so that it | |
3197 | * can only be lowered. | |
3198 | * | |
3199 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3200 | * future associations inheriting the socket value. | |
3201 | */ | |
3202 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3203 | char __user *optval, | |
b7058842 | 3204 | unsigned int optlen) |
70331571 | 3205 | { |
219b99a9 NH |
3206 | struct sctp_assoc_value params; |
3207 | struct sctp_sock *sp; | |
3208 | struct sctp_association *asoc; | |
70331571 | 3209 | int val; |
219b99a9 | 3210 | int assoc_id = 0; |
70331571 | 3211 | |
219b99a9 | 3212 | if (optlen == sizeof(int)) { |
145ce502 JP |
3213 | pr_warn("Use of int in max_burst socket option deprecated\n"); |
3214 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
219b99a9 NH |
3215 | if (copy_from_user(&val, optval, optlen)) |
3216 | return -EFAULT; | |
3217 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3218 | if (copy_from_user(¶ms, optval, optlen)) | |
3219 | return -EFAULT; | |
3220 | val = params.assoc_value; | |
3221 | assoc_id = params.assoc_id; | |
3222 | } else | |
70331571 VY |
3223 | return -EINVAL; |
3224 | ||
219b99a9 NH |
3225 | sp = sctp_sk(sk); |
3226 | ||
3227 | if (assoc_id != 0) { | |
3228 | asoc = sctp_id2assoc(sk, assoc_id); | |
3229 | if (!asoc) | |
3230 | return -EINVAL; | |
3231 | asoc->max_burst = val; | |
3232 | } else | |
3233 | sp->max_burst = val; | |
70331571 VY |
3234 | |
3235 | return 0; | |
3236 | } | |
3237 | ||
65b07e5d VY |
3238 | /* |
3239 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3240 | * | |
3241 | * This set option adds a chunk type that the user is requesting to be | |
3242 | * received only in an authenticated way. Changes to the list of chunks | |
3243 | * will only effect future associations on the socket. | |
3244 | */ | |
3245 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3246 | char __user *optval, |
3247 | unsigned int optlen) | |
65b07e5d VY |
3248 | { |
3249 | struct sctp_authchunk val; | |
3250 | ||
5e739d17 VY |
3251 | if (!sctp_auth_enable) |
3252 | return -EACCES; | |
3253 | ||
65b07e5d VY |
3254 | if (optlen != sizeof(struct sctp_authchunk)) |
3255 | return -EINVAL; | |
3256 | if (copy_from_user(&val, optval, optlen)) | |
3257 | return -EFAULT; | |
3258 | ||
3259 | switch (val.sauth_chunk) { | |
3260 | case SCTP_CID_INIT: | |
3261 | case SCTP_CID_INIT_ACK: | |
3262 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3263 | case SCTP_CID_AUTH: | |
3264 | return -EINVAL; | |
3265 | } | |
3266 | ||
3267 | /* add this chunk id to the endpoint */ | |
3268 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3269 | } | |
3270 | ||
3271 | /* | |
3272 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3273 | * | |
3274 | * This option gets or sets the list of HMAC algorithms that the local | |
3275 | * endpoint requires the peer to use. | |
3276 | */ | |
3277 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3278 | char __user *optval, |
3279 | unsigned int optlen) | |
65b07e5d VY |
3280 | { |
3281 | struct sctp_hmacalgo *hmacs; | |
d9724055 | 3282 | u32 idents; |
65b07e5d VY |
3283 | int err; |
3284 | ||
5e739d17 VY |
3285 | if (!sctp_auth_enable) |
3286 | return -EACCES; | |
3287 | ||
65b07e5d VY |
3288 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3289 | return -EINVAL; | |
3290 | ||
934253a7 SW |
3291 | hmacs= memdup_user(optval, optlen); |
3292 | if (IS_ERR(hmacs)) | |
3293 | return PTR_ERR(hmacs); | |
65b07e5d | 3294 | |
d9724055 VY |
3295 | idents = hmacs->shmac_num_idents; |
3296 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3297 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3298 | err = -EINVAL; |
3299 | goto out; | |
3300 | } | |
3301 | ||
3302 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3303 | out: | |
3304 | kfree(hmacs); | |
3305 | return err; | |
3306 | } | |
3307 | ||
3308 | /* | |
3309 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3310 | * | |
3311 | * This option will set a shared secret key which is used to build an | |
3312 | * association shared key. | |
3313 | */ | |
3314 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3315 | char __user *optval, | |
b7058842 | 3316 | unsigned int optlen) |
65b07e5d VY |
3317 | { |
3318 | struct sctp_authkey *authkey; | |
3319 | struct sctp_association *asoc; | |
3320 | int ret; | |
3321 | ||
5e739d17 VY |
3322 | if (!sctp_auth_enable) |
3323 | return -EACCES; | |
3324 | ||
65b07e5d VY |
3325 | if (optlen <= sizeof(struct sctp_authkey)) |
3326 | return -EINVAL; | |
3327 | ||
934253a7 SW |
3328 | authkey= memdup_user(optval, optlen); |
3329 | if (IS_ERR(authkey)) | |
3330 | return PTR_ERR(authkey); | |
65b07e5d | 3331 | |
328fc47e | 3332 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3333 | ret = -EINVAL; |
3334 | goto out; | |
3335 | } | |
3336 | ||
65b07e5d VY |
3337 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3338 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3339 | ret = -EINVAL; | |
3340 | goto out; | |
3341 | } | |
3342 | ||
3343 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3344 | out: | |
3345 | kfree(authkey); | |
3346 | return ret; | |
3347 | } | |
3348 | ||
3349 | /* | |
3350 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3351 | * | |
3352 | * This option will get or set the active shared key to be used to build | |
3353 | * the association shared key. | |
3354 | */ | |
3355 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3356 | char __user *optval, |
3357 | unsigned int optlen) | |
65b07e5d VY |
3358 | { |
3359 | struct sctp_authkeyid val; | |
3360 | struct sctp_association *asoc; | |
3361 | ||
5e739d17 VY |
3362 | if (!sctp_auth_enable) |
3363 | return -EACCES; | |
3364 | ||
65b07e5d VY |
3365 | if (optlen != sizeof(struct sctp_authkeyid)) |
3366 | return -EINVAL; | |
3367 | if (copy_from_user(&val, optval, optlen)) | |
3368 | return -EFAULT; | |
3369 | ||
3370 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3371 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3372 | return -EINVAL; | |
3373 | ||
3374 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3375 | val.scact_keynumber); | |
3376 | } | |
3377 | ||
3378 | /* | |
3379 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3380 | * | |
3381 | * This set option will delete a shared secret key from use. | |
3382 | */ | |
3383 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3384 | char __user *optval, |
3385 | unsigned int optlen) | |
65b07e5d VY |
3386 | { |
3387 | struct sctp_authkeyid val; | |
3388 | struct sctp_association *asoc; | |
3389 | ||
5e739d17 VY |
3390 | if (!sctp_auth_enable) |
3391 | return -EACCES; | |
3392 | ||
65b07e5d VY |
3393 | if (optlen != sizeof(struct sctp_authkeyid)) |
3394 | return -EINVAL; | |
3395 | if (copy_from_user(&val, optval, optlen)) | |
3396 | return -EFAULT; | |
3397 | ||
3398 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3399 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3400 | return -EINVAL; | |
3401 | ||
3402 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3403 | val.scact_keynumber); | |
3404 | ||
3405 | } | |
3406 | ||
7dc04d71 MH |
3407 | /* |
3408 | * 8.1.23 SCTP_AUTO_ASCONF | |
3409 | * | |
3410 | * This option will enable or disable the use of the automatic generation of | |
3411 | * ASCONF chunks to add and delete addresses to an existing association. Note | |
3412 | * that this option has two caveats namely: a) it only affects sockets that | |
3413 | * are bound to all addresses available to the SCTP stack, and b) the system | |
3414 | * administrator may have an overriding control that turns the ASCONF feature | |
3415 | * off no matter what setting the socket option may have. | |
3416 | * This option expects an integer boolean flag, where a non-zero value turns on | |
3417 | * the option, and a zero value turns off the option. | |
3418 | * Note. In this implementation, socket operation overrides default parameter | |
3419 | * being set by sysctl as well as FreeBSD implementation | |
3420 | */ | |
3421 | static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval, | |
3422 | unsigned int optlen) | |
3423 | { | |
3424 | int val; | |
3425 | struct sctp_sock *sp = sctp_sk(sk); | |
3426 | ||
3427 | if (optlen < sizeof(int)) | |
3428 | return -EINVAL; | |
3429 | if (get_user(val, (int __user *)optval)) | |
3430 | return -EFAULT; | |
3431 | if (!sctp_is_ep_boundall(sk) && val) | |
3432 | return -EINVAL; | |
3433 | if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf)) | |
3434 | return 0; | |
3435 | ||
3436 | if (val == 0 && sp->do_auto_asconf) { | |
3437 | list_del(&sp->auto_asconf_list); | |
3438 | sp->do_auto_asconf = 0; | |
3439 | } else if (val && !sp->do_auto_asconf) { | |
3440 | list_add_tail(&sp->auto_asconf_list, | |
3441 | &sctp_auto_asconf_splist); | |
3442 | sp->do_auto_asconf = 1; | |
3443 | } | |
3444 | return 0; | |
3445 | } | |
3446 | ||
65b07e5d | 3447 | |
1da177e4 LT |
3448 | /* API 6.2 setsockopt(), getsockopt() |
3449 | * | |
3450 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3451 | * socket options. Socket options are used to change the default | |
3452 | * behavior of sockets calls. They are described in Section 7. | |
3453 | * | |
3454 | * The syntax is: | |
3455 | * | |
3456 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3457 | * int __user *optlen); | |
3458 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3459 | * int optlen); | |
3460 | * | |
3461 | * sd - the socket descript. | |
3462 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3463 | * optname - the option name. | |
3464 | * optval - the buffer to store the value of the option. | |
3465 | * optlen - the size of the buffer. | |
3466 | */ | |
3467 | SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 3468 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
3469 | { |
3470 | int retval = 0; | |
3471 | ||
3472 | SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n", | |
3473 | sk, optname); | |
3474 | ||
3475 | /* I can hardly begin to describe how wrong this is. This is | |
3476 | * so broken as to be worse than useless. The API draft | |
3477 | * REALLY is NOT helpful here... I am not convinced that the | |
3478 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3479 | * are at all well-founded. | |
3480 | */ | |
3481 | if (level != SOL_SCTP) { | |
3482 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3483 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3484 | goto out_nounlock; | |
3485 | } | |
3486 | ||
3487 | sctp_lock_sock(sk); | |
3488 | ||
3489 | switch (optname) { | |
3490 | case SCTP_SOCKOPT_BINDX_ADD: | |
3491 | /* 'optlen' is the size of the addresses buffer. */ | |
3492 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3493 | optlen, SCTP_BINDX_ADD_ADDR); | |
3494 | break; | |
3495 | ||
3496 | case SCTP_SOCKOPT_BINDX_REM: | |
3497 | /* 'optlen' is the size of the addresses buffer. */ | |
3498 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3499 | optlen, SCTP_BINDX_REM_ADDR); | |
3500 | break; | |
3501 | ||
88a0a948 VY |
3502 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3503 | /* 'optlen' is the size of the addresses buffer. */ | |
3504 | retval = sctp_setsockopt_connectx_old(sk, | |
3505 | (struct sockaddr __user *)optval, | |
3506 | optlen); | |
3507 | break; | |
3508 | ||
3f7a87d2 FF |
3509 | case SCTP_SOCKOPT_CONNECTX: |
3510 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3511 | retval = sctp_setsockopt_connectx(sk, |
3512 | (struct sockaddr __user *)optval, | |
3513 | optlen); | |
3f7a87d2 FF |
3514 | break; |
3515 | ||
1da177e4 LT |
3516 | case SCTP_DISABLE_FRAGMENTS: |
3517 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3518 | break; | |
3519 | ||
3520 | case SCTP_EVENTS: | |
3521 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3522 | break; | |
3523 | ||
3524 | case SCTP_AUTOCLOSE: | |
3525 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3526 | break; | |
3527 | ||
3528 | case SCTP_PEER_ADDR_PARAMS: | |
3529 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3530 | break; | |
3531 | ||
4580ccc0 | 3532 | case SCTP_DELAYED_SACK: |
d364d927 | 3533 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3534 | break; |
d49d91d7 VY |
3535 | case SCTP_PARTIAL_DELIVERY_POINT: |
3536 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3537 | break; | |
7708610b | 3538 | |
1da177e4 LT |
3539 | case SCTP_INITMSG: |
3540 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3541 | break; | |
3542 | case SCTP_DEFAULT_SEND_PARAM: | |
3543 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3544 | optlen); | |
3545 | break; | |
3546 | case SCTP_PRIMARY_ADDR: | |
3547 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3548 | break; | |
3549 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3550 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3551 | break; | |
3552 | case SCTP_NODELAY: | |
3553 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3554 | break; | |
3555 | case SCTP_RTOINFO: | |
3556 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3557 | break; | |
3558 | case SCTP_ASSOCINFO: | |
3559 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3560 | break; | |
3561 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3562 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3563 | break; | |
3564 | case SCTP_MAXSEG: | |
3565 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3566 | break; | |
0f3fffd8 ISJ |
3567 | case SCTP_ADAPTATION_LAYER: |
3568 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3569 | break; |
6ab792f5 ISJ |
3570 | case SCTP_CONTEXT: |
3571 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3572 | break; | |
b6e1331f VY |
3573 | case SCTP_FRAGMENT_INTERLEAVE: |
3574 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3575 | break; | |
70331571 VY |
3576 | case SCTP_MAX_BURST: |
3577 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3578 | break; | |
65b07e5d VY |
3579 | case SCTP_AUTH_CHUNK: |
3580 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3581 | break; | |
3582 | case SCTP_HMAC_IDENT: | |
3583 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3584 | break; | |
3585 | case SCTP_AUTH_KEY: | |
3586 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3587 | break; | |
3588 | case SCTP_AUTH_ACTIVE_KEY: | |
3589 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3590 | break; | |
3591 | case SCTP_AUTH_DELETE_KEY: | |
3592 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3593 | break; | |
7dc04d71 MH |
3594 | case SCTP_AUTO_ASCONF: |
3595 | retval = sctp_setsockopt_auto_asconf(sk, optval, optlen); | |
3596 | break; | |
1da177e4 LT |
3597 | default: |
3598 | retval = -ENOPROTOOPT; | |
3599 | break; | |
3ff50b79 | 3600 | } |
1da177e4 LT |
3601 | |
3602 | sctp_release_sock(sk); | |
3603 | ||
3604 | out_nounlock: | |
3605 | return retval; | |
3606 | } | |
3607 | ||
3608 | /* API 3.1.6 connect() - UDP Style Syntax | |
3609 | * | |
3610 | * An application may use the connect() call in the UDP model to initiate an | |
3611 | * association without sending data. | |
3612 | * | |
3613 | * The syntax is: | |
3614 | * | |
3615 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3616 | * | |
3617 | * sd: the socket descriptor to have a new association added to. | |
3618 | * | |
3619 | * nam: the address structure (either struct sockaddr_in or struct | |
3620 | * sockaddr_in6 defined in RFC2553 [7]). | |
3621 | * | |
3622 | * len: the size of the address. | |
3623 | */ | |
3f7a87d2 | 3624 | SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr, |
1da177e4 LT |
3625 | int addr_len) |
3626 | { | |
1da177e4 | 3627 | int err = 0; |
3f7a87d2 | 3628 | struct sctp_af *af; |
1da177e4 LT |
3629 | |
3630 | sctp_lock_sock(sk); | |
3631 | ||
3f7a87d2 | 3632 | SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n", |
0dc47877 | 3633 | __func__, sk, addr, addr_len); |
1da177e4 | 3634 | |
3f7a87d2 FF |
3635 | /* Validate addr_len before calling common connect/connectx routine. */ |
3636 | af = sctp_get_af_specific(addr->sa_family); | |
3637 | if (!af || addr_len < af->sockaddr_len) { | |
3638 | err = -EINVAL; | |
3639 | } else { | |
3640 | /* Pass correct addr len to common routine (so it knows there | |
3641 | * is only one address being passed. | |
3642 | */ | |
88a0a948 | 3643 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3644 | } |
3645 | ||
1da177e4 | 3646 | sctp_release_sock(sk); |
1da177e4 LT |
3647 | return err; |
3648 | } | |
3649 | ||
3650 | /* FIXME: Write comments. */ | |
3651 | SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags) | |
3652 | { | |
3653 | return -EOPNOTSUPP; /* STUB */ | |
3654 | } | |
3655 | ||
3656 | /* 4.1.4 accept() - TCP Style Syntax | |
3657 | * | |
3658 | * Applications use accept() call to remove an established SCTP | |
3659 | * association from the accept queue of the endpoint. A new socket | |
3660 | * descriptor will be returned from accept() to represent the newly | |
3661 | * formed association. | |
3662 | */ | |
3663 | SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err) | |
3664 | { | |
3665 | struct sctp_sock *sp; | |
3666 | struct sctp_endpoint *ep; | |
3667 | struct sock *newsk = NULL; | |
3668 | struct sctp_association *asoc; | |
3669 | long timeo; | |
3670 | int error = 0; | |
3671 | ||
3672 | sctp_lock_sock(sk); | |
3673 | ||
3674 | sp = sctp_sk(sk); | |
3675 | ep = sp->ep; | |
3676 | ||
3677 | if (!sctp_style(sk, TCP)) { | |
3678 | error = -EOPNOTSUPP; | |
3679 | goto out; | |
3680 | } | |
3681 | ||
3682 | if (!sctp_sstate(sk, LISTENING)) { | |
3683 | error = -EINVAL; | |
3684 | goto out; | |
3685 | } | |
3686 | ||
8abfedd8 | 3687 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3688 | |
3689 | error = sctp_wait_for_accept(sk, timeo); | |
3690 | if (error) | |
3691 | goto out; | |
3692 | ||
3693 | /* We treat the list of associations on the endpoint as the accept | |
3694 | * queue and pick the first association on the list. | |
3695 | */ | |
3696 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3697 | ||
3698 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3699 | if (!newsk) { | |
3700 | error = -ENOMEM; | |
3701 | goto out; | |
3702 | } | |
3703 | ||
3704 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3705 | * asoc to the newsk. | |
3706 | */ | |
3707 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3708 | ||
3709 | out: | |
3710 | sctp_release_sock(sk); | |
d808ad9a | 3711 | *err = error; |
1da177e4 LT |
3712 | return newsk; |
3713 | } | |
3714 | ||
3715 | /* The SCTP ioctl handler. */ | |
3716 | SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
3717 | { | |
65040c33 DEFP |
3718 | int rc = -ENOTCONN; |
3719 | ||
3720 | sctp_lock_sock(sk); | |
3721 | ||
3722 | /* | |
3723 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3724 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3725 | */ | |
3726 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3727 | goto out; | |
3728 | ||
3729 | switch (cmd) { | |
3730 | case SIOCINQ: { | |
3731 | struct sk_buff *skb; | |
3732 | unsigned int amount = 0; | |
3733 | ||
3734 | skb = skb_peek(&sk->sk_receive_queue); | |
3735 | if (skb != NULL) { | |
3736 | /* | |
3737 | * We will only return the amount of this packet since | |
3738 | * that is all that will be read. | |
3739 | */ | |
3740 | amount = skb->len; | |
3741 | } | |
3742 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3743 | break; |
9a7241c2 | 3744 | } |
65040c33 DEFP |
3745 | default: |
3746 | rc = -ENOIOCTLCMD; | |
3747 | break; | |
3748 | } | |
3749 | out: | |
3750 | sctp_release_sock(sk); | |
3751 | return rc; | |
1da177e4 LT |
3752 | } |
3753 | ||
3754 | /* This is the function which gets called during socket creation to | |
3755 | * initialized the SCTP-specific portion of the sock. | |
3756 | * The sock structure should already be zero-filled memory. | |
3757 | */ | |
3758 | SCTP_STATIC int sctp_init_sock(struct sock *sk) | |
3759 | { | |
3760 | struct sctp_endpoint *ep; | |
3761 | struct sctp_sock *sp; | |
3762 | ||
3763 | SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk); | |
3764 | ||
3765 | sp = sctp_sk(sk); | |
3766 | ||
3767 | /* Initialize the SCTP per socket area. */ | |
3768 | switch (sk->sk_type) { | |
3769 | case SOCK_SEQPACKET: | |
3770 | sp->type = SCTP_SOCKET_UDP; | |
3771 | break; | |
3772 | case SOCK_STREAM: | |
3773 | sp->type = SCTP_SOCKET_TCP; | |
3774 | break; | |
3775 | default: | |
3776 | return -ESOCKTNOSUPPORT; | |
3777 | } | |
3778 | ||
3779 | /* Initialize default send parameters. These parameters can be | |
3780 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3781 | */ | |
3782 | sp->default_stream = 0; | |
3783 | sp->default_ppid = 0; | |
3784 | sp->default_flags = 0; | |
3785 | sp->default_context = 0; | |
3786 | sp->default_timetolive = 0; | |
3787 | ||
6ab792f5 | 3788 | sp->default_rcv_context = 0; |
70331571 | 3789 | sp->max_burst = sctp_max_burst; |
6ab792f5 | 3790 | |
1da177e4 LT |
3791 | /* Initialize default setup parameters. These parameters |
3792 | * can be modified with the SCTP_INITMSG socket option or | |
3793 | * overridden by the SCTP_INIT CMSG. | |
3794 | */ | |
3795 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3796 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
3797 | sp->initmsg.sinit_max_attempts = sctp_max_retrans_init; | |
3fd091e7 | 3798 | sp->initmsg.sinit_max_init_timeo = sctp_rto_max; |
1da177e4 LT |
3799 | |
3800 | /* Initialize default RTO related parameters. These parameters can | |
3801 | * be modified for with the SCTP_RTOINFO socket option. | |
3802 | */ | |
3fd091e7 VY |
3803 | sp->rtoinfo.srto_initial = sctp_rto_initial; |
3804 | sp->rtoinfo.srto_max = sctp_rto_max; | |
3805 | sp->rtoinfo.srto_min = sctp_rto_min; | |
1da177e4 LT |
3806 | |
3807 | /* Initialize default association related parameters. These parameters | |
3808 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3809 | */ | |
3810 | sp->assocparams.sasoc_asocmaxrxt = sctp_max_retrans_association; | |
3811 | sp->assocparams.sasoc_number_peer_destinations = 0; | |
3812 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3813 | sp->assocparams.sasoc_local_rwnd = 0; | |
3fd091e7 | 3814 | sp->assocparams.sasoc_cookie_life = sctp_valid_cookie_life; |
1da177e4 LT |
3815 | |
3816 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 3817 | * options are off. |
1da177e4 LT |
3818 | */ |
3819 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3820 | ||
3821 | /* Default Peer Address Parameters. These defaults can | |
3822 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3823 | */ | |
3fd091e7 | 3824 | sp->hbinterval = sctp_hb_interval; |
52ccb8e9 FF |
3825 | sp->pathmaxrxt = sctp_max_retrans_path; |
3826 | sp->pathmtu = 0; // allow default discovery | |
3fd091e7 | 3827 | sp->sackdelay = sctp_sack_timeout; |
7bfe8bdb | 3828 | sp->sackfreq = 2; |
52ccb8e9 | 3829 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
3830 | SPP_PMTUD_ENABLE | |
3831 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
3832 | |
3833 | /* If enabled no SCTP message fragmentation will be performed. | |
3834 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3835 | */ | |
3836 | sp->disable_fragments = 0; | |
3837 | ||
208edef6 SS |
3838 | /* Enable Nagle algorithm by default. */ |
3839 | sp->nodelay = 0; | |
1da177e4 LT |
3840 | |
3841 | /* Enable by default. */ | |
3842 | sp->v4mapped = 1; | |
3843 | ||
3844 | /* Auto-close idle associations after the configured | |
3845 | * number of seconds. A value of 0 disables this | |
3846 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3847 | * for UDP-style sockets only. | |
3848 | */ | |
3849 | sp->autoclose = 0; | |
3850 | ||
3851 | /* User specified fragmentation limit. */ | |
3852 | sp->user_frag = 0; | |
3853 | ||
0f3fffd8 | 3854 | sp->adaptation_ind = 0; |
1da177e4 LT |
3855 | |
3856 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3857 | ||
3858 | /* Control variables for partial data delivery. */ | |
b6e1331f | 3859 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 3860 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 3861 | sp->frag_interleave = 0; |
1da177e4 LT |
3862 | |
3863 | /* Create a per socket endpoint structure. Even if we | |
3864 | * change the data structure relationships, this may still | |
3865 | * be useful for storing pre-connect address information. | |
3866 | */ | |
3867 | ep = sctp_endpoint_new(sk, GFP_KERNEL); | |
3868 | if (!ep) | |
3869 | return -ENOMEM; | |
3870 | ||
3871 | sp->ep = ep; | |
3872 | sp->hmac = NULL; | |
3873 | ||
3874 | SCTP_DBG_OBJCNT_INC(sock); | |
6f756a8c DM |
3875 | |
3876 | local_bh_disable(); | |
81419d86 | 3877 | percpu_counter_inc(&sctp_sockets_allocated); |
9a57f7fa | 3878 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
9f7d653b MH |
3879 | if (sctp_default_auto_asconf) { |
3880 | list_add_tail(&sp->auto_asconf_list, | |
3881 | &sctp_auto_asconf_splist); | |
3882 | sp->do_auto_asconf = 1; | |
3883 | } else | |
3884 | sp->do_auto_asconf = 0; | |
6f756a8c DM |
3885 | local_bh_enable(); |
3886 | ||
1da177e4 LT |
3887 | return 0; |
3888 | } | |
3889 | ||
3890 | /* Cleanup any SCTP per socket resources. */ | |
7d06b2e0 | 3891 | SCTP_STATIC void sctp_destroy_sock(struct sock *sk) |
1da177e4 | 3892 | { |
9f7d653b | 3893 | struct sctp_sock *sp; |
1da177e4 LT |
3894 | |
3895 | SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk); | |
3896 | ||
3897 | /* Release our hold on the endpoint. */ | |
9f7d653b MH |
3898 | sp = sctp_sk(sk); |
3899 | if (sp->do_auto_asconf) { | |
3900 | sp->do_auto_asconf = 0; | |
3901 | list_del(&sp->auto_asconf_list); | |
3902 | } | |
3903 | sctp_endpoint_free(sp->ep); | |
5bc0b3bf | 3904 | local_bh_disable(); |
81419d86 | 3905 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 3906 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 3907 | local_bh_enable(); |
1da177e4 LT |
3908 | } |
3909 | ||
3910 | /* API 4.1.7 shutdown() - TCP Style Syntax | |
3911 | * int shutdown(int socket, int how); | |
3912 | * | |
3913 | * sd - the socket descriptor of the association to be closed. | |
3914 | * how - Specifies the type of shutdown. The values are | |
3915 | * as follows: | |
3916 | * SHUT_RD | |
3917 | * Disables further receive operations. No SCTP | |
3918 | * protocol action is taken. | |
3919 | * SHUT_WR | |
3920 | * Disables further send operations, and initiates | |
3921 | * the SCTP shutdown sequence. | |
3922 | * SHUT_RDWR | |
3923 | * Disables further send and receive operations | |
3924 | * and initiates the SCTP shutdown sequence. | |
3925 | */ | |
3926 | SCTP_STATIC void sctp_shutdown(struct sock *sk, int how) | |
3927 | { | |
3928 | struct sctp_endpoint *ep; | |
3929 | struct sctp_association *asoc; | |
3930 | ||
3931 | if (!sctp_style(sk, TCP)) | |
3932 | return; | |
3933 | ||
3934 | if (how & SEND_SHUTDOWN) { | |
3935 | ep = sctp_sk(sk)->ep; | |
3936 | if (!list_empty(&ep->asocs)) { | |
3937 | asoc = list_entry(ep->asocs.next, | |
3938 | struct sctp_association, asocs); | |
3939 | sctp_primitive_SHUTDOWN(asoc, NULL); | |
3940 | } | |
3941 | } | |
3942 | } | |
3943 | ||
3944 | /* 7.2.1 Association Status (SCTP_STATUS) | |
3945 | ||
3946 | * Applications can retrieve current status information about an | |
3947 | * association, including association state, peer receiver window size, | |
3948 | * number of unacked data chunks, and number of data chunks pending | |
3949 | * receipt. This information is read-only. | |
3950 | */ | |
3951 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
3952 | char __user *optval, | |
3953 | int __user *optlen) | |
3954 | { | |
3955 | struct sctp_status status; | |
3956 | struct sctp_association *asoc = NULL; | |
3957 | struct sctp_transport *transport; | |
3958 | sctp_assoc_t associd; | |
3959 | int retval = 0; | |
3960 | ||
408f22e8 | 3961 | if (len < sizeof(status)) { |
1da177e4 LT |
3962 | retval = -EINVAL; |
3963 | goto out; | |
3964 | } | |
3965 | ||
408f22e8 NH |
3966 | len = sizeof(status); |
3967 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
3968 | retval = -EFAULT; |
3969 | goto out; | |
3970 | } | |
3971 | ||
3972 | associd = status.sstat_assoc_id; | |
3973 | asoc = sctp_id2assoc(sk, associd); | |
3974 | if (!asoc) { | |
3975 | retval = -EINVAL; | |
3976 | goto out; | |
3977 | } | |
3978 | ||
3979 | transport = asoc->peer.primary_path; | |
3980 | ||
3981 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
3982 | status.sstat_state = asoc->state; | |
3983 | status.sstat_rwnd = asoc->peer.rwnd; | |
3984 | status.sstat_unackdata = asoc->unack_data; | |
3985 | ||
3986 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
3987 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
3988 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
3989 | status.sstat_fragmentation_point = asoc->frag_point; | |
3990 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
3991 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
3992 | transport->af_specific->sockaddr_len); | |
1da177e4 LT |
3993 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
3994 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
3995 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3f7a87d2 | 3996 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
3997 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
3998 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
3999 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4000 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4001 | |
3f7a87d2 FF |
4002 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
4003 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
4004 | ||
1da177e4 LT |
4005 | if (put_user(len, optlen)) { |
4006 | retval = -EFAULT; | |
4007 | goto out; | |
4008 | } | |
4009 | ||
4010 | SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n", | |
4011 | len, status.sstat_state, status.sstat_rwnd, | |
4012 | status.sstat_assoc_id); | |
4013 | ||
4014 | if (copy_to_user(optval, &status, len)) { | |
4015 | retval = -EFAULT; | |
4016 | goto out; | |
4017 | } | |
4018 | ||
4019 | out: | |
a02cec21 | 4020 | return retval; |
1da177e4 LT |
4021 | } |
4022 | ||
4023 | ||
4024 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
4025 | * | |
4026 | * Applications can retrieve information about a specific peer address | |
4027 | * of an association, including its reachability state, congestion | |
4028 | * window, and retransmission timer values. This information is | |
4029 | * read-only. | |
4030 | */ | |
4031 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
4032 | char __user *optval, | |
4033 | int __user *optlen) | |
4034 | { | |
4035 | struct sctp_paddrinfo pinfo; | |
4036 | struct sctp_transport *transport; | |
4037 | int retval = 0; | |
4038 | ||
408f22e8 | 4039 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
4040 | retval = -EINVAL; |
4041 | goto out; | |
4042 | } | |
4043 | ||
408f22e8 NH |
4044 | len = sizeof(pinfo); |
4045 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
4046 | retval = -EFAULT; |
4047 | goto out; | |
4048 | } | |
4049 | ||
4050 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
4051 | pinfo.spinfo_assoc_id); | |
4052 | if (!transport) | |
4053 | return -EINVAL; | |
4054 | ||
4055 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 4056 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
4057 | pinfo.spinfo_cwnd = transport->cwnd; |
4058 | pinfo.spinfo_srtt = transport->srtt; | |
4059 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4060 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4061 | |
3f7a87d2 FF |
4062 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
4063 | pinfo.spinfo_state = SCTP_ACTIVE; | |
4064 | ||
1da177e4 LT |
4065 | if (put_user(len, optlen)) { |
4066 | retval = -EFAULT; | |
4067 | goto out; | |
4068 | } | |
4069 | ||
4070 | if (copy_to_user(optval, &pinfo, len)) { | |
4071 | retval = -EFAULT; | |
4072 | goto out; | |
4073 | } | |
4074 | ||
4075 | out: | |
a02cec21 | 4076 | return retval; |
1da177e4 LT |
4077 | } |
4078 | ||
4079 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
4080 | * | |
4081 | * This option is a on/off flag. If enabled no SCTP message | |
4082 | * fragmentation will be performed. Instead if a message being sent | |
4083 | * exceeds the current PMTU size, the message will NOT be sent and | |
4084 | * instead a error will be indicated to the user. | |
4085 | */ | |
4086 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
4087 | char __user *optval, int __user *optlen) | |
4088 | { | |
4089 | int val; | |
4090 | ||
4091 | if (len < sizeof(int)) | |
4092 | return -EINVAL; | |
4093 | ||
4094 | len = sizeof(int); | |
4095 | val = (sctp_sk(sk)->disable_fragments == 1); | |
4096 | if (put_user(len, optlen)) | |
4097 | return -EFAULT; | |
4098 | if (copy_to_user(optval, &val, len)) | |
4099 | return -EFAULT; | |
4100 | return 0; | |
4101 | } | |
4102 | ||
4103 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4104 | * | |
4105 | * This socket option is used to specify various notifications and | |
4106 | * ancillary data the user wishes to receive. | |
4107 | */ | |
4108 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4109 | int __user *optlen) | |
4110 | { | |
408f22e8 | 4111 | if (len < sizeof(struct sctp_event_subscribe)) |
1da177e4 | 4112 | return -EINVAL; |
408f22e8 NH |
4113 | len = sizeof(struct sctp_event_subscribe); |
4114 | if (put_user(len, optlen)) | |
4115 | return -EFAULT; | |
1da177e4 LT |
4116 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4117 | return -EFAULT; | |
4118 | return 0; | |
4119 | } | |
4120 | ||
4121 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4122 | * | |
4123 | * This socket option is applicable to the UDP-style socket only. When | |
4124 | * set it will cause associations that are idle for more than the | |
4125 | * specified number of seconds to automatically close. An association | |
4126 | * being idle is defined an association that has NOT sent or received | |
4127 | * user data. The special value of '0' indicates that no automatic | |
4128 | * close of any associations should be performed. The option expects an | |
4129 | * integer defining the number of seconds of idle time before an | |
4130 | * association is closed. | |
4131 | */ | |
4132 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4133 | { | |
4134 | /* Applicable to UDP-style socket only */ | |
4135 | if (sctp_style(sk, TCP)) | |
4136 | return -EOPNOTSUPP; | |
408f22e8 | 4137 | if (len < sizeof(int)) |
1da177e4 | 4138 | return -EINVAL; |
408f22e8 NH |
4139 | len = sizeof(int); |
4140 | if (put_user(len, optlen)) | |
4141 | return -EFAULT; | |
4142 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4143 | return -EFAULT; |
4144 | return 0; | |
4145 | } | |
4146 | ||
4147 | /* Helper routine to branch off an association to a new socket. */ | |
4148 | SCTP_STATIC int sctp_do_peeloff(struct sctp_association *asoc, | |
4149 | struct socket **sockp) | |
4150 | { | |
4151 | struct sock *sk = asoc->base.sk; | |
4152 | struct socket *sock; | |
d570ee49 | 4153 | struct sctp_af *af; |
1da177e4 LT |
4154 | int err = 0; |
4155 | ||
4156 | /* An association cannot be branched off from an already peeled-off | |
4157 | * socket, nor is this supported for tcp style sockets. | |
4158 | */ | |
4159 | if (!sctp_style(sk, UDP)) | |
4160 | return -EINVAL; | |
4161 | ||
4162 | /* Create a new socket. */ | |
4163 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4164 | if (err < 0) | |
4165 | return err; | |
4166 | ||
914e1c8b | 4167 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4168 | |
4169 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4170 | * Set the daddr and initialize id to something more random | |
4171 | */ | |
d570ee49 VY |
4172 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4173 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
914e1c8b VY |
4174 | |
4175 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4176 | * asoc to the newsk. | |
4177 | */ | |
4178 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4179 | |
1da177e4 LT |
4180 | *sockp = sock; |
4181 | ||
4182 | return err; | |
4183 | } | |
4184 | ||
4185 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4186 | { | |
4187 | sctp_peeloff_arg_t peeloff; | |
4188 | struct socket *newsock; | |
4189 | int retval = 0; | |
4190 | struct sctp_association *asoc; | |
4191 | ||
408f22e8 | 4192 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4193 | return -EINVAL; |
408f22e8 | 4194 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4195 | if (copy_from_user(&peeloff, optval, len)) |
4196 | return -EFAULT; | |
4197 | ||
4198 | asoc = sctp_id2assoc(sk, peeloff.associd); | |
4199 | if (!asoc) { | |
4200 | retval = -EINVAL; | |
4201 | goto out; | |
4202 | } | |
4203 | ||
0dc47877 | 4204 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p\n", __func__, sk, asoc); |
1da177e4 LT |
4205 | |
4206 | retval = sctp_do_peeloff(asoc, &newsock); | |
4207 | if (retval < 0) | |
4208 | goto out; | |
4209 | ||
4210 | /* Map the socket to an unused fd that can be returned to the user. */ | |
a677a039 | 4211 | retval = sock_map_fd(newsock, 0); |
1da177e4 LT |
4212 | if (retval < 0) { |
4213 | sock_release(newsock); | |
4214 | goto out; | |
4215 | } | |
4216 | ||
4217 | SCTP_DEBUG_PRINTK("%s: sk: %p asoc: %p newsk: %p sd: %d\n", | |
0dc47877 | 4218 | __func__, sk, asoc, newsock->sk, retval); |
1da177e4 LT |
4219 | |
4220 | /* Return the fd mapped to the new socket. */ | |
4221 | peeloff.sd = retval; | |
408f22e8 NH |
4222 | if (put_user(len, optlen)) |
4223 | return -EFAULT; | |
1da177e4 LT |
4224 | if (copy_to_user(optval, &peeloff, len)) |
4225 | retval = -EFAULT; | |
4226 | ||
4227 | out: | |
4228 | return retval; | |
4229 | } | |
4230 | ||
4231 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4232 | * | |
4233 | * Applications can enable or disable heartbeats for any peer address of | |
4234 | * an association, modify an address's heartbeat interval, force a | |
4235 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4236 | * number of retransmissions sent before an address is considered | |
4237 | * unreachable. The following structure is used to access and modify an | |
4238 | * address's parameters: | |
4239 | * | |
4240 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4241 | * sctp_assoc_t spp_assoc_id; |
4242 | * struct sockaddr_storage spp_address; | |
4243 | * uint32_t spp_hbinterval; | |
4244 | * uint16_t spp_pathmaxrxt; | |
4245 | * uint32_t spp_pathmtu; | |
4246 | * uint32_t spp_sackdelay; | |
4247 | * uint32_t spp_flags; | |
4248 | * }; | |
4249 | * | |
4250 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4251 | * application, and identifies the association for | |
4252 | * this query. | |
1da177e4 LT |
4253 | * spp_address - This specifies which address is of interest. |
4254 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4255 | * in milliseconds. If a value of zero |
4256 | * is present in this field then no changes are to | |
4257 | * be made to this parameter. | |
1da177e4 LT |
4258 | * spp_pathmaxrxt - This contains the maximum number of |
4259 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4260 | * considered unreachable. If a value of zero |
4261 | * is present in this field then no changes are to | |
4262 | * be made to this parameter. | |
4263 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4264 | * specified here will be the "fixed" path mtu. | |
4265 | * Note that if the spp_address field is empty | |
4266 | * then all associations on this address will | |
4267 | * have this fixed path mtu set upon them. | |
4268 | * | |
4269 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4270 | * the number of milliseconds that sacks will be delayed | |
4271 | * for. This value will apply to all addresses of an | |
4272 | * association if the spp_address field is empty. Note | |
4273 | * also, that if delayed sack is enabled and this | |
4274 | * value is set to 0, no change is made to the last | |
4275 | * recorded delayed sack timer value. | |
4276 | * | |
4277 | * spp_flags - These flags are used to control various features | |
4278 | * on an association. The flag field may contain | |
4279 | * zero or more of the following options. | |
4280 | * | |
4281 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4282 | * specified address. Note that if the address | |
4283 | * field is empty all addresses for the association | |
4284 | * have heartbeats enabled upon them. | |
4285 | * | |
4286 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4287 | * speicifed address. Note that if the address | |
4288 | * field is empty all addresses for the association | |
4289 | * will have their heartbeats disabled. Note also | |
4290 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4291 | * mutually exclusive, only one of these two should | |
4292 | * be specified. Enabling both fields will have | |
4293 | * undetermined results. | |
4294 | * | |
4295 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4296 | * to be made immediately. | |
4297 | * | |
4298 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4299 | * discovery upon the specified address. Note that | |
4300 | * if the address feild is empty then all addresses | |
4301 | * on the association are effected. | |
4302 | * | |
4303 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4304 | * discovery upon the specified address. Note that | |
4305 | * if the address feild is empty then all addresses | |
4306 | * on the association are effected. Not also that | |
4307 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4308 | * exclusive. Enabling both will have undetermined | |
4309 | * results. | |
4310 | * | |
4311 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4312 | * on delayed sack. The time specified in spp_sackdelay | |
4313 | * is used to specify the sack delay for this address. Note | |
4314 | * that if spp_address is empty then all addresses will | |
4315 | * enable delayed sack and take on the sack delay | |
4316 | * value specified in spp_sackdelay. | |
4317 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4318 | * off delayed sack. If the spp_address field is blank then | |
4319 | * delayed sack is disabled for the entire association. Note | |
4320 | * also that this field is mutually exclusive to | |
4321 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4322 | * results. | |
1da177e4 LT |
4323 | */ |
4324 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4325 | char __user *optval, int __user *optlen) |
1da177e4 | 4326 | { |
52ccb8e9 FF |
4327 | struct sctp_paddrparams params; |
4328 | struct sctp_transport *trans = NULL; | |
4329 | struct sctp_association *asoc = NULL; | |
4330 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4331 | |
408f22e8 | 4332 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4333 | return -EINVAL; |
408f22e8 | 4334 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4335 | if (copy_from_user(¶ms, optval, len)) |
4336 | return -EFAULT; | |
4337 | ||
52ccb8e9 FF |
4338 | /* If an address other than INADDR_ANY is specified, and |
4339 | * no transport is found, then the request is invalid. | |
1da177e4 | 4340 | */ |
52cae8f0 | 4341 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4342 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4343 | params.spp_assoc_id); | |
4344 | if (!trans) { | |
4345 | SCTP_DEBUG_PRINTK("Failed no transport\n"); | |
4346 | return -EINVAL; | |
4347 | } | |
1da177e4 LT |
4348 | } |
4349 | ||
52ccb8e9 FF |
4350 | /* Get association, if assoc_id != 0 and the socket is a one |
4351 | * to many style socket, and an association was not found, then | |
4352 | * the id was invalid. | |
4353 | */ | |
4354 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4355 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
4356 | SCTP_DEBUG_PRINTK("Failed no association\n"); | |
1da177e4 | 4357 | return -EINVAL; |
52ccb8e9 | 4358 | } |
1da177e4 | 4359 | |
52ccb8e9 FF |
4360 | if (trans) { |
4361 | /* Fetch transport values. */ | |
4362 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4363 | params.spp_pathmtu = trans->pathmtu; | |
4364 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4365 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4366 | ||
4367 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4368 | params.spp_flags = trans->param_flags; | |
4369 | } else if (asoc) { | |
4370 | /* Fetch association values. */ | |
4371 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4372 | params.spp_pathmtu = asoc->pathmtu; | |
4373 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4374 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4375 | ||
4376 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4377 | params.spp_flags = asoc->param_flags; | |
4378 | } else { | |
4379 | /* Fetch socket values. */ | |
4380 | params.spp_hbinterval = sp->hbinterval; | |
4381 | params.spp_pathmtu = sp->pathmtu; | |
4382 | params.spp_sackdelay = sp->sackdelay; | |
4383 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4384 | |
52ccb8e9 FF |
4385 | /*draft-11 doesn't say what to return in spp_flags*/ |
4386 | params.spp_flags = sp->param_flags; | |
4387 | } | |
1da177e4 | 4388 | |
1da177e4 LT |
4389 | if (copy_to_user(optval, ¶ms, len)) |
4390 | return -EFAULT; | |
4391 | ||
4392 | if (put_user(len, optlen)) | |
4393 | return -EFAULT; | |
4394 | ||
4395 | return 0; | |
4396 | } | |
4397 | ||
d364d927 WY |
4398 | /* |
4399 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4400 | * | |
4401 | * This option will effect the way delayed acks are performed. This | |
4402 | * option allows you to get or set the delayed ack time, in | |
4403 | * milliseconds. It also allows changing the delayed ack frequency. | |
4404 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4405 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4406 | * values. If the assoc_id field is non-zero, then the set or get | |
4407 | * effects the specified association for the one to many model (the | |
4408 | * assoc_id field is ignored by the one to one model). Note that if | |
4409 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4410 | * current values will remain unchanged. | |
4411 | * | |
4412 | * struct sctp_sack_info { | |
4413 | * sctp_assoc_t sack_assoc_id; | |
4414 | * uint32_t sack_delay; | |
4415 | * uint32_t sack_freq; | |
4416 | * }; | |
7708610b | 4417 | * |
d364d927 WY |
4418 | * sack_assoc_id - This parameter, indicates which association the user |
4419 | * is performing an action upon. Note that if this field's value is | |
4420 | * zero then the endpoints default value is changed (effecting future | |
4421 | * associations only). | |
7708610b | 4422 | * |
d364d927 WY |
4423 | * sack_delay - This parameter contains the number of milliseconds that |
4424 | * the user is requesting the delayed ACK timer be set to. Note that | |
4425 | * this value is defined in the standard to be between 200 and 500 | |
4426 | * milliseconds. | |
7708610b | 4427 | * |
d364d927 WY |
4428 | * sack_freq - This parameter contains the number of packets that must |
4429 | * be received before a sack is sent without waiting for the delay | |
4430 | * timer to expire. The default value for this is 2, setting this | |
4431 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4432 | */ |
d364d927 | 4433 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4434 | char __user *optval, |
4435 | int __user *optlen) | |
4436 | { | |
d364d927 | 4437 | struct sctp_sack_info params; |
7708610b FF |
4438 | struct sctp_association *asoc = NULL; |
4439 | struct sctp_sock *sp = sctp_sk(sk); | |
4440 | ||
d364d927 WY |
4441 | if (len >= sizeof(struct sctp_sack_info)) { |
4442 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4443 | |
d364d927 WY |
4444 | if (copy_from_user(¶ms, optval, len)) |
4445 | return -EFAULT; | |
4446 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
4447 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
4448 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
4449 | if (copy_from_user(¶ms, optval, len)) |
4450 | return -EFAULT; | |
4451 | } else | |
4452 | return - EINVAL; | |
7708610b | 4453 | |
d364d927 | 4454 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4455 | * to many style socket, and an association was not found, then |
4456 | * the id was invalid. | |
d808ad9a | 4457 | */ |
d364d927 WY |
4458 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4459 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4460 | return -EINVAL; |
4461 | ||
4462 | if (asoc) { | |
4463 | /* Fetch association values. */ | |
d364d927 WY |
4464 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4465 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4466 | asoc->sackdelay); |
d364d927 WY |
4467 | params.sack_freq = asoc->sackfreq; |
4468 | ||
4469 | } else { | |
4470 | params.sack_delay = 0; | |
4471 | params.sack_freq = 1; | |
4472 | } | |
7708610b FF |
4473 | } else { |
4474 | /* Fetch socket values. */ | |
d364d927 WY |
4475 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4476 | params.sack_delay = sp->sackdelay; | |
4477 | params.sack_freq = sp->sackfreq; | |
4478 | } else { | |
4479 | params.sack_delay = 0; | |
4480 | params.sack_freq = 1; | |
4481 | } | |
7708610b FF |
4482 | } |
4483 | ||
4484 | if (copy_to_user(optval, ¶ms, len)) | |
4485 | return -EFAULT; | |
4486 | ||
4487 | if (put_user(len, optlen)) | |
4488 | return -EFAULT; | |
4489 | ||
4490 | return 0; | |
4491 | } | |
4492 | ||
1da177e4 LT |
4493 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4494 | * | |
4495 | * Applications can specify protocol parameters for the default association | |
4496 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4497 | * is SCTP_INITMSG. | |
4498 | * | |
4499 | * Setting initialization parameters is effective only on an unconnected | |
4500 | * socket (for UDP-style sockets only future associations are effected | |
4501 | * by the change). With TCP-style sockets, this option is inherited by | |
4502 | * sockets derived from a listener socket. | |
4503 | */ | |
4504 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4505 | { | |
408f22e8 | 4506 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4507 | return -EINVAL; |
408f22e8 NH |
4508 | len = sizeof(struct sctp_initmsg); |
4509 | if (put_user(len, optlen)) | |
4510 | return -EFAULT; | |
1da177e4 LT |
4511 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4512 | return -EFAULT; | |
4513 | return 0; | |
4514 | } | |
4515 | ||