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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2003 Intel Corp. | |
6 | * Copyright (c) 2001-2002 Nokia, Inc. | |
7 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
8 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * These functions interface with the sockets layer to implement the | |
12 | * SCTP Extensions for the Sockets API. | |
13 | * | |
14 | * Note that the descriptions from the specification are USER level | |
15 | * functions--this file is the functions which populate the struct proto | |
16 | * for SCTP which is the BOTTOM of the sockets interface. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is free software; |
1da177e4 LT |
19 | * you can redistribute it and/or modify it under the terms of |
20 | * the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2, or (at your option) | |
22 | * any later version. | |
23 | * | |
60c778b2 | 24 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
25 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
26 | * ************************ | |
27 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
28 | * See the GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with GNU CC; see the file COPYING. If not, write to | |
32 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
33 | * Boston, MA 02111-1307, USA. | |
34 | * | |
35 | * Please send any bug reports or fixes you make to the | |
36 | * email address(es): | |
37 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
38 | * | |
39 | * Or submit a bug report through the following website: | |
40 | * http://www.sf.net/projects/lksctp | |
41 | * | |
42 | * Written or modified by: | |
43 | * La Monte H.P. Yarroll <piggy@acm.org> | |
44 | * Narasimha Budihal <narsi@refcode.org> | |
45 | * Karl Knutson <karl@athena.chicago.il.us> | |
46 | * Jon Grimm <jgrimm@us.ibm.com> | |
47 | * Xingang Guo <xingang.guo@intel.com> | |
48 | * Daisy Chang <daisyc@us.ibm.com> | |
49 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
50 | * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com> | |
51 | * Ardelle Fan <ardelle.fan@intel.com> | |
52 | * Ryan Layer <rmlayer@us.ibm.com> | |
53 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> | |
54 | * Kevin Gao <kevin.gao@intel.com> | |
55 | * | |
56 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
57 | * be incorporated into the next SCTP release. | |
58 | */ | |
59 | ||
145ce502 JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
1da177e4 LT |
62 | #include <linux/types.h> |
63 | #include <linux/kernel.h> | |
64 | #include <linux/wait.h> | |
65 | #include <linux/time.h> | |
66 | #include <linux/ip.h> | |
4fc268d2 | 67 | #include <linux/capability.h> |
1da177e4 LT |
68 | #include <linux/fcntl.h> |
69 | #include <linux/poll.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/crypto.h> | |
5a0e3ad6 | 72 | #include <linux/slab.h> |
56b31d1c | 73 | #include <linux/file.h> |
1da177e4 LT |
74 | |
75 | #include <net/ip.h> | |
76 | #include <net/icmp.h> | |
77 | #include <net/route.h> | |
78 | #include <net/ipv6.h> | |
79 | #include <net/inet_common.h> | |
80 | ||
81 | #include <linux/socket.h> /* for sa_family_t */ | |
bc3b2d7f | 82 | #include <linux/export.h> |
1da177e4 LT |
83 | #include <net/sock.h> |
84 | #include <net/sctp/sctp.h> | |
85 | #include <net/sctp/sm.h> | |
86 | ||
1da177e4 LT |
87 | /* Forward declarations for internal helper functions. */ |
88 | static int sctp_writeable(struct sock *sk); | |
89 | static void sctp_wfree(struct sk_buff *skb); | |
90 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, | |
91 | size_t msg_len); | |
92 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p); | |
93 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); | |
94 | static int sctp_wait_for_accept(struct sock *sk, long timeo); | |
95 | static void sctp_wait_for_close(struct sock *sk, long timeo); | |
0a2fbac1 | 96 | static void sctp_destruct_sock(struct sock *sk); |
1da177e4 LT |
97 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
98 | union sctp_addr *addr, int len); | |
99 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); | |
100 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); | |
101 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); | |
102 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); | |
103 | static int sctp_send_asconf(struct sctp_association *asoc, | |
104 | struct sctp_chunk *chunk); | |
105 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); | |
106 | static int sctp_autobind(struct sock *sk); | |
107 | static void sctp_sock_migrate(struct sock *, struct sock *, | |
108 | struct sctp_association *, sctp_socket_type_t); | |
1da177e4 | 109 | |
4d93df0a | 110 | extern struct kmem_cache *sctp_bucket_cachep; |
8d987e5c | 111 | extern long sysctl_sctp_mem[3]; |
4d93df0a NH |
112 | extern int sysctl_sctp_rmem[3]; |
113 | extern int sysctl_sctp_wmem[3]; | |
114 | ||
b6fa1a4d | 115 | static int sctp_memory_pressure; |
8d987e5c | 116 | static atomic_long_t sctp_memory_allocated; |
1748376b | 117 | struct percpu_counter sctp_sockets_allocated; |
4d93df0a | 118 | |
5c52ba17 | 119 | static void sctp_enter_memory_pressure(struct sock *sk) |
4d93df0a NH |
120 | { |
121 | sctp_memory_pressure = 1; | |
122 | } | |
123 | ||
124 | ||
1da177e4 LT |
125 | /* Get the sndbuf space available at the time on the association. */ |
126 | static inline int sctp_wspace(struct sctp_association *asoc) | |
127 | { | |
4d93df0a | 128 | int amt; |
1da177e4 | 129 | |
4d93df0a NH |
130 | if (asoc->ep->sndbuf_policy) |
131 | amt = asoc->sndbuf_used; | |
132 | else | |
31e6d363 | 133 | amt = sk_wmem_alloc_get(asoc->base.sk); |
4d93df0a NH |
134 | |
135 | if (amt >= asoc->base.sk->sk_sndbuf) { | |
136 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
137 | amt = 0; | |
138 | else { | |
139 | amt = sk_stream_wspace(asoc->base.sk); | |
140 | if (amt < 0) | |
141 | amt = 0; | |
142 | } | |
4eb701df | 143 | } else { |
4d93df0a | 144 | amt = asoc->base.sk->sk_sndbuf - amt; |
4eb701df | 145 | } |
1da177e4 LT |
146 | return amt; |
147 | } | |
148 | ||
149 | /* Increment the used sndbuf space count of the corresponding association by | |
150 | * the size of the outgoing data chunk. | |
151 | * Also, set the skb destructor for sndbuf accounting later. | |
152 | * | |
153 | * Since it is always 1-1 between chunk and skb, and also a new skb is always | |
154 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the | |
155 | * destructor in the data chunk skb for the purpose of the sndbuf space | |
156 | * tracking. | |
157 | */ | |
158 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) | |
159 | { | |
160 | struct sctp_association *asoc = chunk->asoc; | |
161 | struct sock *sk = asoc->base.sk; | |
162 | ||
163 | /* The sndbuf space is tracked per association. */ | |
164 | sctp_association_hold(asoc); | |
165 | ||
4eb701df NH |
166 | skb_set_owner_w(chunk->skb, sk); |
167 | ||
1da177e4 LT |
168 | chunk->skb->destructor = sctp_wfree; |
169 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ | |
170 | *((struct sctp_chunk **)(chunk->skb->cb)) = chunk; | |
171 | ||
4eb701df NH |
172 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
173 | sizeof(struct sk_buff) + | |
174 | sizeof(struct sctp_chunk); | |
175 | ||
4eb701df | 176 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
3ab224be HA |
177 | sk->sk_wmem_queued += chunk->skb->truesize; |
178 | sk_mem_charge(sk, chunk->skb->truesize); | |
1da177e4 LT |
179 | } |
180 | ||
181 | /* Verify that this is a valid address. */ | |
182 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, | |
183 | int len) | |
184 | { | |
185 | struct sctp_af *af; | |
186 | ||
187 | /* Verify basic sockaddr. */ | |
188 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); | |
189 | if (!af) | |
190 | return -EINVAL; | |
191 | ||
192 | /* Is this a valid SCTP address? */ | |
5636bef7 | 193 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
1da177e4 LT |
194 | return -EINVAL; |
195 | ||
196 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) | |
197 | return -EINVAL; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Look up the association by its id. If this is not a UDP-style | |
203 | * socket, the ID field is always ignored. | |
204 | */ | |
205 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) | |
206 | { | |
207 | struct sctp_association *asoc = NULL; | |
208 | ||
209 | /* If this is not a UDP-style socket, assoc id should be ignored. */ | |
210 | if (!sctp_style(sk, UDP)) { | |
211 | /* Return NULL if the socket state is not ESTABLISHED. It | |
212 | * could be a TCP-style listening socket or a socket which | |
213 | * hasn't yet called connect() to establish an association. | |
214 | */ | |
215 | if (!sctp_sstate(sk, ESTABLISHED)) | |
216 | return NULL; | |
217 | ||
218 | /* Get the first and the only association from the list. */ | |
219 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) | |
220 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, | |
221 | struct sctp_association, asocs); | |
222 | return asoc; | |
223 | } | |
224 | ||
225 | /* Otherwise this is a UDP-style socket. */ | |
226 | if (!id || (id == (sctp_assoc_t)-1)) | |
227 | return NULL; | |
228 | ||
229 | spin_lock_bh(&sctp_assocs_id_lock); | |
230 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); | |
231 | spin_unlock_bh(&sctp_assocs_id_lock); | |
232 | ||
233 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) | |
234 | return NULL; | |
235 | ||
236 | return asoc; | |
237 | } | |
238 | ||
239 | /* Look up the transport from an address and an assoc id. If both address and | |
240 | * id are specified, the associations matching the address and the id should be | |
241 | * the same. | |
242 | */ | |
243 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, | |
244 | struct sockaddr_storage *addr, | |
245 | sctp_assoc_t id) | |
246 | { | |
247 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; | |
248 | struct sctp_transport *transport; | |
249 | union sctp_addr *laddr = (union sctp_addr *)addr; | |
250 | ||
1da177e4 | 251 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
cd4ff034 | 252 | laddr, |
1da177e4 | 253 | &transport); |
1da177e4 LT |
254 | |
255 | if (!addr_asoc) | |
256 | return NULL; | |
257 | ||
258 | id_asoc = sctp_id2assoc(sk, id); | |
259 | if (id_asoc && (id_asoc != addr_asoc)) | |
260 | return NULL; | |
261 | ||
262 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
263 | (union sctp_addr *)addr); | |
264 | ||
265 | return transport; | |
266 | } | |
267 | ||
268 | /* API 3.1.2 bind() - UDP Style Syntax | |
269 | * The syntax of bind() is, | |
270 | * | |
271 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); | |
272 | * | |
273 | * sd - the socket descriptor returned by socket(). | |
274 | * addr - the address structure (struct sockaddr_in or struct | |
275 | * sockaddr_in6 [RFC 2553]), | |
276 | * addr_len - the size of the address structure. | |
277 | */ | |
dda91928 | 278 | static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
1da177e4 LT |
279 | { |
280 | int retval = 0; | |
281 | ||
282 | sctp_lock_sock(sk); | |
283 | ||
bb33381d DB |
284 | pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk, |
285 | addr, addr_len); | |
1da177e4 LT |
286 | |
287 | /* Disallow binding twice. */ | |
288 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
3f7a87d2 | 289 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
1da177e4 LT |
290 | addr_len); |
291 | else | |
292 | retval = -EINVAL; | |
293 | ||
294 | sctp_release_sock(sk); | |
295 | ||
296 | return retval; | |
297 | } | |
298 | ||
299 | static long sctp_get_port_local(struct sock *, union sctp_addr *); | |
300 | ||
301 | /* Verify this is a valid sockaddr. */ | |
302 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
303 | union sctp_addr *addr, int len) | |
304 | { | |
305 | struct sctp_af *af; | |
306 | ||
307 | /* Check minimum size. */ | |
308 | if (len < sizeof (struct sockaddr)) | |
309 | return NULL; | |
310 | ||
7dab83de VY |
311 | /* V4 mapped address are really of AF_INET family */ |
312 | if (addr->sa.sa_family == AF_INET6 && | |
313 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { | |
314 | if (!opt->pf->af_supported(AF_INET, opt)) | |
315 | return NULL; | |
316 | } else { | |
317 | /* Does this PF support this AF? */ | |
318 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) | |
319 | return NULL; | |
320 | } | |
1da177e4 LT |
321 | |
322 | /* If we get this far, af is valid. */ | |
323 | af = sctp_get_af_specific(addr->sa.sa_family); | |
324 | ||
325 | if (len < af->sockaddr_len) | |
326 | return NULL; | |
327 | ||
328 | return af; | |
329 | } | |
330 | ||
331 | /* Bind a local address either to an endpoint or to an association. */ | |
dda91928 | 332 | static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) |
1da177e4 | 333 | { |
3594698a | 334 | struct net *net = sock_net(sk); |
1da177e4 LT |
335 | struct sctp_sock *sp = sctp_sk(sk); |
336 | struct sctp_endpoint *ep = sp->ep; | |
337 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
338 | struct sctp_af *af; | |
339 | unsigned short snum; | |
340 | int ret = 0; | |
341 | ||
1da177e4 LT |
342 | /* Common sockaddr verification. */ |
343 | af = sctp_sockaddr_af(sp, addr, len); | |
3f7a87d2 | 344 | if (!af) { |
bb33381d DB |
345 | pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n", |
346 | __func__, sk, addr, len); | |
1da177e4 | 347 | return -EINVAL; |
3f7a87d2 FF |
348 | } |
349 | ||
350 | snum = ntohs(addr->v4.sin_port); | |
351 | ||
bb33381d DB |
352 | pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n", |
353 | __func__, sk, &addr->sa, bp->port, snum, len); | |
1da177e4 LT |
354 | |
355 | /* PF specific bind() address verification. */ | |
356 | if (!sp->pf->bind_verify(sp, addr)) | |
357 | return -EADDRNOTAVAIL; | |
358 | ||
8b358056 VY |
359 | /* We must either be unbound, or bind to the same port. |
360 | * It's OK to allow 0 ports if we are already bound. | |
361 | * We'll just inhert an already bound port in this case | |
362 | */ | |
363 | if (bp->port) { | |
364 | if (!snum) | |
365 | snum = bp->port; | |
366 | else if (snum != bp->port) { | |
bb33381d DB |
367 | pr_debug("%s: new port %d doesn't match existing port " |
368 | "%d\n", __func__, snum, bp->port); | |
8b358056 VY |
369 | return -EINVAL; |
370 | } | |
1da177e4 LT |
371 | } |
372 | ||
3594698a EB |
373 | if (snum && snum < PROT_SOCK && |
374 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
375 | return -EACCES; |
376 | ||
4e54064e VY |
377 | /* See if the address matches any of the addresses we may have |
378 | * already bound before checking against other endpoints. | |
379 | */ | |
380 | if (sctp_bind_addr_match(bp, addr, sp)) | |
381 | return -EINVAL; | |
382 | ||
1da177e4 LT |
383 | /* Make sure we are allowed to bind here. |
384 | * The function sctp_get_port_local() does duplicate address | |
385 | * detection. | |
386 | */ | |
2772b495 | 387 | addr->v4.sin_port = htons(snum); |
1da177e4 | 388 | if ((ret = sctp_get_port_local(sk, addr))) { |
4e54064e | 389 | return -EADDRINUSE; |
1da177e4 LT |
390 | } |
391 | ||
392 | /* Refresh ephemeral port. */ | |
393 | if (!bp->port) | |
c720c7e8 | 394 | bp->port = inet_sk(sk)->inet_num; |
1da177e4 | 395 | |
559cf710 VY |
396 | /* Add the address to the bind address list. |
397 | * Use GFP_ATOMIC since BHs will be disabled. | |
398 | */ | |
f57d96b2 | 399 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
1da177e4 LT |
400 | |
401 | /* Copy back into socket for getsockname() use. */ | |
402 | if (!ret) { | |
c720c7e8 | 403 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
1da177e4 LT |
404 | af->to_sk_saddr(addr, sk); |
405 | } | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
411 | * | |
d808ad9a | 412 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
1da177e4 | 413 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
d808ad9a | 414 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
1da177e4 | 415 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
d808ad9a YH |
416 | * subsequent ASCONF. Note this restriction binds each side, so at any |
417 | * time two ASCONF may be in-transit on any given association (one sent | |
1da177e4 LT |
418 | * from each endpoint). |
419 | */ | |
420 | static int sctp_send_asconf(struct sctp_association *asoc, | |
421 | struct sctp_chunk *chunk) | |
422 | { | |
55e26eb9 | 423 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
424 | int retval = 0; |
425 | ||
426 | /* If there is an outstanding ASCONF chunk, queue it for later | |
427 | * transmission. | |
d808ad9a | 428 | */ |
1da177e4 | 429 | if (asoc->addip_last_asconf) { |
79af02c2 | 430 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
d808ad9a | 431 | goto out; |
1da177e4 LT |
432 | } |
433 | ||
434 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
435 | sctp_chunk_hold(chunk); | |
55e26eb9 | 436 | retval = sctp_primitive_ASCONF(net, asoc, chunk); |
1da177e4 LT |
437 | if (retval) |
438 | sctp_chunk_free(chunk); | |
439 | else | |
440 | asoc->addip_last_asconf = chunk; | |
441 | ||
442 | out: | |
443 | return retval; | |
444 | } | |
445 | ||
446 | /* Add a list of addresses as bind addresses to local endpoint or | |
447 | * association. | |
448 | * | |
449 | * Basically run through each address specified in the addrs/addrcnt | |
450 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
451 | * sctp_do_bind() on it. | |
452 | * | |
453 | * If any of them fails, then the operation will be reversed and the | |
454 | * ones that were added will be removed. | |
455 | * | |
456 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
457 | */ | |
04675210 | 458 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
459 | { |
460 | int cnt; | |
461 | int retval = 0; | |
462 | void *addr_buf; | |
463 | struct sockaddr *sa_addr; | |
464 | struct sctp_af *af; | |
465 | ||
bb33381d DB |
466 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk, |
467 | addrs, addrcnt); | |
1da177e4 LT |
468 | |
469 | addr_buf = addrs; | |
470 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
471 | /* The list may contain either IPv4 or IPv6 address; | |
472 | * determine the address length for walking thru the list. | |
473 | */ | |
ea110733 | 474 | sa_addr = addr_buf; |
1da177e4 LT |
475 | af = sctp_get_af_specific(sa_addr->sa_family); |
476 | if (!af) { | |
477 | retval = -EINVAL; | |
478 | goto err_bindx_add; | |
479 | } | |
480 | ||
d808ad9a | 481 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
1da177e4 LT |
482 | af->sockaddr_len); |
483 | ||
484 | addr_buf += af->sockaddr_len; | |
485 | ||
486 | err_bindx_add: | |
487 | if (retval < 0) { | |
488 | /* Failed. Cleanup the ones that have been added */ | |
489 | if (cnt > 0) | |
490 | sctp_bindx_rem(sk, addrs, cnt); | |
491 | return retval; | |
492 | } | |
493 | } | |
494 | ||
495 | return retval; | |
496 | } | |
497 | ||
498 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the | |
499 | * associations that are part of the endpoint indicating that a list of local | |
500 | * addresses are added to the endpoint. | |
501 | * | |
d808ad9a | 502 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
503 | * association, we do not send the chunk for that association. But it will not |
504 | * affect other associations. | |
505 | * | |
506 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
507 | */ | |
d808ad9a | 508 | static int sctp_send_asconf_add_ip(struct sock *sk, |
1da177e4 LT |
509 | struct sockaddr *addrs, |
510 | int addrcnt) | |
511 | { | |
e1fc3b14 | 512 | struct net *net = sock_net(sk); |
1da177e4 LT |
513 | struct sctp_sock *sp; |
514 | struct sctp_endpoint *ep; | |
515 | struct sctp_association *asoc; | |
516 | struct sctp_bind_addr *bp; | |
517 | struct sctp_chunk *chunk; | |
518 | struct sctp_sockaddr_entry *laddr; | |
519 | union sctp_addr *addr; | |
dc022a98 | 520 | union sctp_addr saveaddr; |
1da177e4 LT |
521 | void *addr_buf; |
522 | struct sctp_af *af; | |
1da177e4 LT |
523 | struct list_head *p; |
524 | int i; | |
525 | int retval = 0; | |
526 | ||
e1fc3b14 | 527 | if (!net->sctp.addip_enable) |
1da177e4 LT |
528 | return retval; |
529 | ||
530 | sp = sctp_sk(sk); | |
531 | ep = sp->ep; | |
532 | ||
bb33381d DB |
533 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
534 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 535 | |
9dbc15f0 | 536 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
537 | if (!asoc->peer.asconf_capable) |
538 | continue; | |
539 | ||
540 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) | |
541 | continue; | |
542 | ||
543 | if (!sctp_state(asoc, ESTABLISHED)) | |
544 | continue; | |
545 | ||
546 | /* Check if any address in the packed array of addresses is | |
d808ad9a YH |
547 | * in the bind address list of the association. If so, |
548 | * do not send the asconf chunk to its peer, but continue with | |
1da177e4 LT |
549 | * other associations. |
550 | */ | |
551 | addr_buf = addrs; | |
552 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 553 | addr = addr_buf; |
1da177e4 LT |
554 | af = sctp_get_af_specific(addr->v4.sin_family); |
555 | if (!af) { | |
556 | retval = -EINVAL; | |
557 | goto out; | |
558 | } | |
559 | ||
560 | if (sctp_assoc_lookup_laddr(asoc, addr)) | |
561 | break; | |
562 | ||
563 | addr_buf += af->sockaddr_len; | |
564 | } | |
565 | if (i < addrcnt) | |
566 | continue; | |
567 | ||
559cf710 VY |
568 | /* Use the first valid address in bind addr list of |
569 | * association as Address Parameter of ASCONF CHUNK. | |
1da177e4 | 570 | */ |
1da177e4 LT |
571 | bp = &asoc->base.bind_addr; |
572 | p = bp->address_list.next; | |
573 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
5ae955cf | 574 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
1da177e4 LT |
575 | addrcnt, SCTP_PARAM_ADD_IP); |
576 | if (!chunk) { | |
577 | retval = -ENOMEM; | |
578 | goto out; | |
579 | } | |
580 | ||
dc022a98 SS |
581 | /* Add the new addresses to the bind address list with |
582 | * use_as_src set to 0. | |
1da177e4 | 583 | */ |
dc022a98 SS |
584 | addr_buf = addrs; |
585 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 586 | addr = addr_buf; |
dc022a98 SS |
587 | af = sctp_get_af_specific(addr->v4.sin_family); |
588 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
f57d96b2 VY |
589 | retval = sctp_add_bind_addr(bp, &saveaddr, |
590 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
591 | addr_buf += af->sockaddr_len; |
592 | } | |
8a07eb0a MH |
593 | if (asoc->src_out_of_asoc_ok) { |
594 | struct sctp_transport *trans; | |
595 | ||
596 | list_for_each_entry(trans, | |
597 | &asoc->peer.transport_addr_list, transports) { | |
598 | /* Clear the source and route cache */ | |
599 | dst_release(trans->dst); | |
600 | trans->cwnd = min(4*asoc->pathmtu, max_t(__u32, | |
601 | 2*asoc->pathmtu, 4380)); | |
602 | trans->ssthresh = asoc->peer.i.a_rwnd; | |
603 | trans->rto = asoc->rto_initial; | |
196d6759 | 604 | sctp_max_rto(asoc, trans); |
8a07eb0a MH |
605 | trans->rtt = trans->srtt = trans->rttvar = 0; |
606 | sctp_transport_route(trans, NULL, | |
607 | sctp_sk(asoc->base.sk)); | |
608 | } | |
609 | } | |
610 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
611 | } |
612 | ||
613 | out: | |
614 | return retval; | |
615 | } | |
616 | ||
617 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
618 | * last address. | |
619 | * | |
620 | * Basically run through each address specified in the addrs/addrcnt | |
621 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
622 | * sctp_del_bind() on it. | |
623 | * | |
624 | * If any of them fails, then the operation will be reversed and the | |
625 | * ones that were removed will be added back. | |
626 | * | |
627 | * At least one address has to be left; if only one address is | |
628 | * available, the operation will return -EBUSY. | |
629 | * | |
630 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
631 | */ | |
04675210 | 632 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
633 | { |
634 | struct sctp_sock *sp = sctp_sk(sk); | |
635 | struct sctp_endpoint *ep = sp->ep; | |
636 | int cnt; | |
637 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
638 | int retval = 0; | |
1da177e4 | 639 | void *addr_buf; |
c9a08505 | 640 | union sctp_addr *sa_addr; |
1da177e4 LT |
641 | struct sctp_af *af; |
642 | ||
bb33381d DB |
643 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
644 | __func__, sk, addrs, addrcnt); | |
1da177e4 LT |
645 | |
646 | addr_buf = addrs; | |
647 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
648 | /* If the bind address list is empty or if there is only one | |
649 | * bind address, there is nothing more to be removed (we need | |
650 | * at least one address here). | |
651 | */ | |
652 | if (list_empty(&bp->address_list) || | |
653 | (sctp_list_single_entry(&bp->address_list))) { | |
654 | retval = -EBUSY; | |
655 | goto err_bindx_rem; | |
656 | } | |
657 | ||
ea110733 | 658 | sa_addr = addr_buf; |
c9a08505 | 659 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1da177e4 LT |
660 | if (!af) { |
661 | retval = -EINVAL; | |
662 | goto err_bindx_rem; | |
663 | } | |
0304ff8a PG |
664 | |
665 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
666 | retval = -EADDRNOTAVAIL; | |
667 | goto err_bindx_rem; | |
668 | } | |
669 | ||
ee9cbaca VY |
670 | if (sa_addr->v4.sin_port && |
671 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
672 | retval = -EINVAL; |
673 | goto err_bindx_rem; | |
674 | } | |
675 | ||
ee9cbaca VY |
676 | if (!sa_addr->v4.sin_port) |
677 | sa_addr->v4.sin_port = htons(bp->port); | |
678 | ||
1da177e4 LT |
679 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
680 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
681 | * be removed. This is something which needs to be looked into | |
682 | * when we are fixing the outstanding issues with multi-homing | |
683 | * socket routing and failover schemes. Refer to comments in | |
684 | * sctp_do_bind(). -daisy | |
685 | */ | |
0ed90fb0 | 686 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
687 | |
688 | addr_buf += af->sockaddr_len; | |
689 | err_bindx_rem: | |
690 | if (retval < 0) { | |
691 | /* Failed. Add the ones that has been removed back */ | |
692 | if (cnt > 0) | |
693 | sctp_bindx_add(sk, addrs, cnt); | |
694 | return retval; | |
695 | } | |
696 | } | |
697 | ||
698 | return retval; | |
699 | } | |
700 | ||
701 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
702 | * the associations that are part of the endpoint indicating that a list of | |
703 | * local addresses are removed from the endpoint. | |
704 | * | |
d808ad9a | 705 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
706 | * association, we do not send the chunk for that association. But it will not |
707 | * affect other associations. | |
708 | * | |
709 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
710 | */ | |
711 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
712 | struct sockaddr *addrs, | |
713 | int addrcnt) | |
714 | { | |
e1fc3b14 | 715 | struct net *net = sock_net(sk); |
1da177e4 LT |
716 | struct sctp_sock *sp; |
717 | struct sctp_endpoint *ep; | |
718 | struct sctp_association *asoc; | |
dc022a98 | 719 | struct sctp_transport *transport; |
1da177e4 LT |
720 | struct sctp_bind_addr *bp; |
721 | struct sctp_chunk *chunk; | |
722 | union sctp_addr *laddr; | |
723 | void *addr_buf; | |
724 | struct sctp_af *af; | |
dc022a98 | 725 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
726 | int i; |
727 | int retval = 0; | |
8a07eb0a | 728 | int stored = 0; |
1da177e4 | 729 | |
8a07eb0a | 730 | chunk = NULL; |
e1fc3b14 | 731 | if (!net->sctp.addip_enable) |
1da177e4 LT |
732 | return retval; |
733 | ||
734 | sp = sctp_sk(sk); | |
735 | ep = sp->ep; | |
736 | ||
bb33381d DB |
737 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
738 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 739 | |
9dbc15f0 | 740 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
741 | |
742 | if (!asoc->peer.asconf_capable) | |
743 | continue; | |
744 | ||
745 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
746 | continue; | |
747 | ||
748 | if (!sctp_state(asoc, ESTABLISHED)) | |
749 | continue; | |
750 | ||
751 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 752 | * not present in the bind address list of the association. |
1da177e4 LT |
753 | * If so, do not send the asconf chunk to its peer, but |
754 | * continue with other associations. | |
755 | */ | |
756 | addr_buf = addrs; | |
757 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 758 | laddr = addr_buf; |
1da177e4 LT |
759 | af = sctp_get_af_specific(laddr->v4.sin_family); |
760 | if (!af) { | |
761 | retval = -EINVAL; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
766 | break; | |
767 | ||
768 | addr_buf += af->sockaddr_len; | |
769 | } | |
770 | if (i < addrcnt) | |
771 | continue; | |
772 | ||
773 | /* Find one address in the association's bind address list | |
774 | * that is not in the packed array of addresses. This is to | |
775 | * make sure that we do not delete all the addresses in the | |
776 | * association. | |
777 | */ | |
1da177e4 LT |
778 | bp = &asoc->base.bind_addr; |
779 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
780 | addrcnt, sp); | |
8a07eb0a MH |
781 | if ((laddr == NULL) && (addrcnt == 1)) { |
782 | if (asoc->asconf_addr_del_pending) | |
783 | continue; | |
784 | asoc->asconf_addr_del_pending = | |
785 | kzalloc(sizeof(union sctp_addr), GFP_ATOMIC); | |
6d65e5ee MH |
786 | if (asoc->asconf_addr_del_pending == NULL) { |
787 | retval = -ENOMEM; | |
788 | goto out; | |
789 | } | |
8a07eb0a MH |
790 | asoc->asconf_addr_del_pending->sa.sa_family = |
791 | addrs->sa_family; | |
792 | asoc->asconf_addr_del_pending->v4.sin_port = | |
793 | htons(bp->port); | |
794 | if (addrs->sa_family == AF_INET) { | |
795 | struct sockaddr_in *sin; | |
796 | ||
797 | sin = (struct sockaddr_in *)addrs; | |
798 | asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr; | |
799 | } else if (addrs->sa_family == AF_INET6) { | |
800 | struct sockaddr_in6 *sin6; | |
801 | ||
802 | sin6 = (struct sockaddr_in6 *)addrs; | |
4e3fd7a0 | 803 | asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr; |
8a07eb0a | 804 | } |
bb33381d DB |
805 | |
806 | pr_debug("%s: keep the last address asoc:%p %pISc at %p\n", | |
807 | __func__, asoc, &asoc->asconf_addr_del_pending->sa, | |
808 | asoc->asconf_addr_del_pending); | |
809 | ||
8a07eb0a MH |
810 | asoc->src_out_of_asoc_ok = 1; |
811 | stored = 1; | |
812 | goto skip_mkasconf; | |
813 | } | |
1da177e4 | 814 | |
559cf710 VY |
815 | /* We do not need RCU protection throughout this loop |
816 | * because this is done under a socket lock from the | |
817 | * setsockopt call. | |
818 | */ | |
1da177e4 LT |
819 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
820 | SCTP_PARAM_DEL_IP); | |
821 | if (!chunk) { | |
822 | retval = -ENOMEM; | |
823 | goto out; | |
824 | } | |
825 | ||
8a07eb0a | 826 | skip_mkasconf: |
dc022a98 SS |
827 | /* Reset use_as_src flag for the addresses in the bind address |
828 | * list that are to be deleted. | |
829 | */ | |
dc022a98 SS |
830 | addr_buf = addrs; |
831 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 832 | laddr = addr_buf; |
dc022a98 | 833 | af = sctp_get_af_specific(laddr->v4.sin_family); |
559cf710 | 834 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 835 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 836 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
837 | } |
838 | addr_buf += af->sockaddr_len; | |
839 | } | |
1da177e4 | 840 | |
dc022a98 SS |
841 | /* Update the route and saddr entries for all the transports |
842 | * as some of the addresses in the bind address list are | |
843 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 844 | */ |
9dbc15f0 RD |
845 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
846 | transports) { | |
dc022a98 SS |
847 | dst_release(transport->dst); |
848 | sctp_transport_route(transport, NULL, | |
849 | sctp_sk(asoc->base.sk)); | |
850 | } | |
851 | ||
8a07eb0a MH |
852 | if (stored) |
853 | /* We don't need to transmit ASCONF */ | |
854 | continue; | |
dc022a98 | 855 | retval = sctp_send_asconf(asoc, chunk); |
1da177e4 LT |
856 | } |
857 | out: | |
858 | return retval; | |
859 | } | |
860 | ||
9f7d653b MH |
861 | /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */ |
862 | int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) | |
863 | { | |
864 | struct sock *sk = sctp_opt2sk(sp); | |
865 | union sctp_addr *addr; | |
866 | struct sctp_af *af; | |
867 | ||
868 | /* It is safe to write port space in caller. */ | |
869 | addr = &addrw->a; | |
870 | addr->v4.sin_port = htons(sp->ep->base.bind_addr.port); | |
871 | af = sctp_get_af_specific(addr->sa.sa_family); | |
872 | if (!af) | |
873 | return -EINVAL; | |
874 | if (sctp_verify_addr(sk, addr, af->sockaddr_len)) | |
875 | return -EINVAL; | |
876 | ||
877 | if (addrw->state == SCTP_ADDR_NEW) | |
878 | return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1); | |
879 | else | |
880 | return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1); | |
881 | } | |
882 | ||
1da177e4 LT |
883 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
884 | * | |
885 | * API 8.1 | |
886 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
887 | * int flags); | |
888 | * | |
889 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
890 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
891 | * or IPv6 addresses. | |
892 | * | |
893 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
894 | * Section 3.1.2 for this usage. | |
895 | * | |
896 | * addrs is a pointer to an array of one or more socket addresses. Each | |
897 | * address is contained in its appropriate structure (i.e. struct | |
898 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 899 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
900 | * representation is termed a "packed array" of addresses). The caller |
901 | * specifies the number of addresses in the array with addrcnt. | |
902 | * | |
903 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
904 | * -1, and sets errno to the appropriate error code. | |
905 | * | |
906 | * For SCTP, the port given in each socket address must be the same, or | |
907 | * sctp_bindx() will fail, setting errno to EINVAL. | |
908 | * | |
909 | * The flags parameter is formed from the bitwise OR of zero or more of | |
910 | * the following currently defined flags: | |
911 | * | |
912 | * SCTP_BINDX_ADD_ADDR | |
913 | * | |
914 | * SCTP_BINDX_REM_ADDR | |
915 | * | |
916 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
917 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
918 | * addresses from the association. The two flags are mutually exclusive; | |
919 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
920 | * not remove all addresses from an association; sctp_bindx() will | |
921 | * reject such an attempt with EINVAL. | |
922 | * | |
923 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
924 | * additional addresses with an endpoint after calling bind(). Or use | |
925 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
926 | * socket is associated with so that no new association accepted will be | |
927 | * associated with those addresses. If the endpoint supports dynamic | |
928 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
929 | * endpoint to send the appropriate message to the peer to change the | |
930 | * peers address lists. | |
931 | * | |
932 | * Adding and removing addresses from a connected association is | |
933 | * optional functionality. Implementations that do not support this | |
934 | * functionality should return EOPNOTSUPP. | |
935 | * | |
936 | * Basically do nothing but copying the addresses from user to kernel | |
937 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
938 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
939 | * from userspace. | |
1da177e4 LT |
940 | * |
941 | * We don't use copy_from_user() for optimization: we first do the | |
942 | * sanity checks (buffer size -fast- and access check-healthy | |
943 | * pointer); if all of those succeed, then we can alloc the memory | |
944 | * (expensive operation) needed to copy the data to kernel. Then we do | |
945 | * the copying without checking the user space area | |
946 | * (__copy_from_user()). | |
947 | * | |
948 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
949 | * it. | |
950 | * | |
951 | * sk The sk of the socket | |
952 | * addrs The pointer to the addresses in user land | |
953 | * addrssize Size of the addrs buffer | |
954 | * op Operation to perform (add or remove, see the flags of | |
955 | * sctp_bindx) | |
956 | * | |
957 | * Returns 0 if ok, <0 errno code on error. | |
958 | */ | |
dda91928 DB |
959 | static int sctp_setsockopt_bindx(struct sock* sk, |
960 | struct sockaddr __user *addrs, | |
961 | int addrs_size, int op) | |
1da177e4 LT |
962 | { |
963 | struct sockaddr *kaddrs; | |
964 | int err; | |
965 | int addrcnt = 0; | |
966 | int walk_size = 0; | |
967 | struct sockaddr *sa_addr; | |
968 | void *addr_buf; | |
969 | struct sctp_af *af; | |
970 | ||
bb33381d DB |
971 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n", |
972 | __func__, sk, addrs, addrs_size, op); | |
1da177e4 LT |
973 | |
974 | if (unlikely(addrs_size <= 0)) | |
975 | return -EINVAL; | |
976 | ||
977 | /* Check the user passed a healthy pointer. */ | |
978 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
979 | return -EFAULT; | |
980 | ||
981 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 982 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1da177e4 LT |
983 | if (unlikely(!kaddrs)) |
984 | return -ENOMEM; | |
985 | ||
986 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
987 | kfree(kaddrs); | |
988 | return -EFAULT; | |
989 | } | |
990 | ||
d808ad9a | 991 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
992 | addr_buf = kaddrs; |
993 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
994 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
995 | kfree(kaddrs); | |
996 | return -EINVAL; | |
997 | } | |
998 | ||
ea110733 | 999 | sa_addr = addr_buf; |
1da177e4 LT |
1000 | af = sctp_get_af_specific(sa_addr->sa_family); |
1001 | ||
1002 | /* If the address family is not supported or if this address | |
1003 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 1004 | */ |
1da177e4 LT |
1005 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
1006 | kfree(kaddrs); | |
1007 | return -EINVAL; | |
1008 | } | |
1009 | addrcnt++; | |
1010 | addr_buf += af->sockaddr_len; | |
1011 | walk_size += af->sockaddr_len; | |
1012 | } | |
1013 | ||
1014 | /* Do the work. */ | |
1015 | switch (op) { | |
1016 | case SCTP_BINDX_ADD_ADDR: | |
1017 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
1018 | if (err) | |
1019 | goto out; | |
1020 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
1021 | break; | |
1022 | ||
1023 | case SCTP_BINDX_REM_ADDR: | |
1024 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
1025 | if (err) | |
1026 | goto out; | |
1027 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
1028 | break; | |
1029 | ||
1030 | default: | |
1031 | err = -EINVAL; | |
1032 | break; | |
3ff50b79 | 1033 | } |
1da177e4 LT |
1034 | |
1035 | out: | |
1036 | kfree(kaddrs); | |
1037 | ||
1038 | return err; | |
1039 | } | |
1040 | ||
3f7a87d2 FF |
1041 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
1042 | * | |
1043 | * Common routine for handling connect() and sctp_connectx(). | |
1044 | * Connect will come in with just a single address. | |
1045 | */ | |
1046 | static int __sctp_connect(struct sock* sk, | |
1047 | struct sockaddr *kaddrs, | |
88a0a948 VY |
1048 | int addrs_size, |
1049 | sctp_assoc_t *assoc_id) | |
3f7a87d2 | 1050 | { |
55e26eb9 | 1051 | struct net *net = sock_net(sk); |
3f7a87d2 FF |
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 | ||
ea110733 | 1091 | sa_addr = addr_buf; |
4bdf4b5f | 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 | */ | |
524fba6c WY |
1114 | if (asoc && asoc->peer.port && asoc->peer.port != port) { |
1115 | err = -EINVAL; | |
16d00fb7 | 1116 | goto out_free; |
524fba6c | 1117 | } |
3f7a87d2 FF |
1118 | |
1119 | /* Check if there already is a matching association on the | |
1120 | * endpoint (other than the one created here). | |
1121 | */ | |
e4d1feab | 1122 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1123 | if (asoc2 && asoc2 != asoc) { |
1124 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1125 | err = -EISCONN; | |
1126 | else | |
1127 | err = -EALREADY; | |
1128 | goto out_free; | |
1129 | } | |
1130 | ||
1131 | /* If we could not find a matching association on the endpoint, | |
1132 | * make sure that there is no peeled-off association matching | |
1133 | * the peer address even on another socket. | |
1134 | */ | |
e4d1feab | 1135 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1136 | err = -EADDRNOTAVAIL; |
1137 | goto out_free; | |
1138 | } | |
1139 | ||
1140 | if (!asoc) { | |
1141 | /* If a bind() or sctp_bindx() is not called prior to | |
1142 | * an sctp_connectx() call, the system picks an | |
1143 | * ephemeral port and will choose an address set | |
1144 | * equivalent to binding with a wildcard address. | |
1145 | */ | |
1146 | if (!ep->base.bind_addr.port) { | |
1147 | if (sctp_autobind(sk)) { | |
1148 | err = -EAGAIN; | |
1149 | goto out_free; | |
1150 | } | |
64a0c1c8 ISJ |
1151 | } else { |
1152 | /* | |
d808ad9a YH |
1153 | * If an unprivileged user inherits a 1-many |
1154 | * style socket with open associations on a | |
1155 | * privileged port, it MAY be permitted to | |
1156 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1157 | * be permitted to open new associations. |
1158 | */ | |
1159 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1160 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1161 | err = -EACCES; |
1162 | goto out_free; | |
1163 | } | |
3f7a87d2 FF |
1164 | } |
1165 | ||
e4d1feab | 1166 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1167 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1168 | if (!asoc) { | |
1169 | err = -ENOMEM; | |
1170 | goto out_free; | |
1171 | } | |
409b95af VY |
1172 | |
1173 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1174 | GFP_KERNEL); | |
1175 | if (err < 0) { | |
1176 | goto out_free; | |
1177 | } | |
1178 | ||
3f7a87d2 FF |
1179 | } |
1180 | ||
1181 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1182 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1183 | SCTP_UNKNOWN); |
1184 | if (!transport) { | |
1185 | err = -ENOMEM; | |
1186 | goto out_free; | |
1187 | } | |
1188 | ||
1189 | addrcnt++; | |
1190 | addr_buf += af->sockaddr_len; | |
1191 | walk_size += af->sockaddr_len; | |
1192 | } | |
1193 | ||
c6ba68a2 VY |
1194 | /* In case the user of sctp_connectx() wants an association |
1195 | * id back, assign one now. | |
1196 | */ | |
1197 | if (assoc_id) { | |
1198 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1199 | if (err < 0) | |
1200 | goto out_free; | |
1201 | } | |
1202 | ||
55e26eb9 | 1203 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
3f7a87d2 FF |
1204 | if (err < 0) { |
1205 | goto out_free; | |
1206 | } | |
1207 | ||
1208 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1209 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
e4d1feab VY |
1210 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1211 | af->to_sk_daddr(sa_addr, sk); | |
8de8c873 | 1212 | sk->sk_err = 0; |
3f7a87d2 | 1213 | |
f50f95ca VY |
1214 | /* in-kernel sockets don't generally have a file allocated to them |
1215 | * if all they do is call sock_create_kern(). | |
1216 | */ | |
1217 | if (sk->sk_socket->file) | |
1218 | f_flags = sk->sk_socket->file->f_flags; | |
1219 | ||
1220 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1221 | ||
3f7a87d2 | 1222 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1223 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1224 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1225 | |
1226 | /* Don't free association on exit. */ | |
1227 | asoc = NULL; | |
1228 | ||
1229 | out_free: | |
bb33381d DB |
1230 | pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n", |
1231 | __func__, asoc, kaddrs, err); | |
3f7a87d2 | 1232 | |
2eebc1e1 NH |
1233 | if (asoc) { |
1234 | /* sctp_primitive_ASSOCIATE may have added this association | |
1235 | * To the hash table, try to unhash it, just in case, its a noop | |
1236 | * if it wasn't hashed so we're safe | |
1237 | */ | |
1238 | sctp_unhash_established(asoc); | |
3f7a87d2 | 1239 | sctp_association_free(asoc); |
2eebc1e1 | 1240 | } |
3f7a87d2 FF |
1241 | return err; |
1242 | } | |
1243 | ||
1244 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1245 | * | |
1246 | * API 8.9 | |
88a0a948 VY |
1247 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1248 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1249 | * |
1250 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1251 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1252 | * or IPv6 addresses. | |
1253 | * | |
1254 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1255 | * Section 3.1.2 for this usage. | |
1256 | * | |
1257 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1258 | * address is contained in its appropriate structure (i.e. struct | |
1259 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1260 | * must be used to distengish the address length (note that this | |
1261 | * representation is termed a "packed array" of addresses). The caller | |
1262 | * specifies the number of addresses in the array with addrcnt. | |
1263 | * | |
88a0a948 VY |
1264 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1265 | * the association id of the new association. On failure, sctp_connectx() | |
1266 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1267 | * is not touched by the kernel. | |
3f7a87d2 FF |
1268 | * |
1269 | * For SCTP, the port given in each socket address must be the same, or | |
1270 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1271 | * | |
1272 | * An application can use sctp_connectx to initiate an association with | |
1273 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1274 | * allows a caller to specify multiple addresses at which a peer can be | |
1275 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1276 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1277 | * specifies that the stack will try to make use of all the addresses in |
1278 | * the list when needed. | |
1279 | * | |
1280 | * Note that the list of addresses passed in is only used for setting up | |
1281 | * the association. It does not necessarily equal the set of addresses | |
1282 | * the peer uses for the resulting association. If the caller wants to | |
1283 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1284 | * retrieve them after the association has been set up. | |
1285 | * | |
1286 | * Basically do nothing but copying the addresses from user to kernel | |
1287 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1288 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1289 | * | |
1290 | * We don't use copy_from_user() for optimization: we first do the | |
1291 | * sanity checks (buffer size -fast- and access check-healthy | |
1292 | * pointer); if all of those succeed, then we can alloc the memory | |
1293 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1294 | * the copying without checking the user space area | |
1295 | * (__copy_from_user()). | |
1296 | * | |
1297 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1298 | * it. | |
1299 | * | |
1300 | * sk The sk of the socket | |
1301 | * addrs The pointer to the addresses in user land | |
1302 | * addrssize Size of the addrs buffer | |
1303 | * | |
88a0a948 | 1304 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1305 | */ |
dda91928 | 1306 | static int __sctp_setsockopt_connectx(struct sock* sk, |
3f7a87d2 | 1307 | struct sockaddr __user *addrs, |
88a0a948 VY |
1308 | int addrs_size, |
1309 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1310 | { |
1311 | int err = 0; | |
1312 | struct sockaddr *kaddrs; | |
1313 | ||
bb33381d DB |
1314 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n", |
1315 | __func__, sk, addrs, addrs_size); | |
3f7a87d2 FF |
1316 | |
1317 | if (unlikely(addrs_size <= 0)) | |
1318 | return -EINVAL; | |
1319 | ||
1320 | /* Check the user passed a healthy pointer. */ | |
1321 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1322 | return -EFAULT; | |
1323 | ||
1324 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 1325 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
3f7a87d2 FF |
1326 | if (unlikely(!kaddrs)) |
1327 | return -ENOMEM; | |
1328 | ||
1329 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1330 | err = -EFAULT; | |
1331 | } else { | |
88a0a948 | 1332 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1333 | } |
1334 | ||
1335 | kfree(kaddrs); | |
88a0a948 | 1336 | |
3f7a87d2 FF |
1337 | return err; |
1338 | } | |
1339 | ||
88a0a948 VY |
1340 | /* |
1341 | * This is an older interface. It's kept for backward compatibility | |
1342 | * to the option that doesn't provide association id. | |
1343 | */ | |
dda91928 DB |
1344 | static int sctp_setsockopt_connectx_old(struct sock* sk, |
1345 | struct sockaddr __user *addrs, | |
1346 | int addrs_size) | |
88a0a948 VY |
1347 | { |
1348 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * New interface for the API. The since the API is done with a socket | |
1353 | * option, to make it simple we feed back the association id is as a return | |
1354 | * indication to the call. Error is always negative and association id is | |
1355 | * always positive. | |
1356 | */ | |
dda91928 DB |
1357 | static int sctp_setsockopt_connectx(struct sock* sk, |
1358 | struct sockaddr __user *addrs, | |
1359 | int addrs_size) | |
88a0a948 VY |
1360 | { |
1361 | sctp_assoc_t assoc_id = 0; | |
1362 | int err = 0; | |
1363 | ||
1364 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1365 | ||
1366 | if (err) | |
1367 | return err; | |
1368 | else | |
1369 | return assoc_id; | |
1370 | } | |
1371 | ||
c6ba68a2 | 1372 | /* |
f9c67811 VY |
1373 | * New (hopefully final) interface for the API. |
1374 | * We use the sctp_getaddrs_old structure so that use-space library | |
1375 | * can avoid any unnecessary allocations. The only defferent part | |
1376 | * is that we store the actual length of the address buffer into the | |
1377 | * addrs_num structure member. That way we can re-use the existing | |
1378 | * code. | |
c6ba68a2 | 1379 | */ |
dda91928 DB |
1380 | static int sctp_getsockopt_connectx3(struct sock* sk, int len, |
1381 | char __user *optval, | |
1382 | int __user *optlen) | |
c6ba68a2 | 1383 | { |
f9c67811 | 1384 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1385 | sctp_assoc_t assoc_id = 0; |
1386 | int err = 0; | |
1387 | ||
f9c67811 | 1388 | if (len < sizeof(param)) |
c6ba68a2 VY |
1389 | return -EINVAL; |
1390 | ||
f9c67811 VY |
1391 | if (copy_from_user(¶m, optval, sizeof(param))) |
1392 | return -EFAULT; | |
1393 | ||
c6ba68a2 | 1394 | err = __sctp_setsockopt_connectx(sk, |
f9c67811 VY |
1395 | (struct sockaddr __user *)param.addrs, |
1396 | param.addr_num, &assoc_id); | |
c6ba68a2 VY |
1397 | |
1398 | if (err == 0 || err == -EINPROGRESS) { | |
1399 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1400 | return -EFAULT; | |
1401 | if (put_user(sizeof(assoc_id), optlen)) | |
1402 | return -EFAULT; | |
1403 | } | |
1404 | ||
1405 | return err; | |
1406 | } | |
1407 | ||
1da177e4 LT |
1408 | /* API 3.1.4 close() - UDP Style Syntax |
1409 | * Applications use close() to perform graceful shutdown (as described in | |
1410 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1411 | * by a UDP-style socket. | |
1412 | * | |
1413 | * The syntax is | |
1414 | * | |
1415 | * ret = close(int sd); | |
1416 | * | |
1417 | * sd - the socket descriptor of the associations to be closed. | |
1418 | * | |
1419 | * To gracefully shutdown a specific association represented by the | |
1420 | * UDP-style socket, an application should use the sendmsg() call, | |
1421 | * passing no user data, but including the appropriate flag in the | |
1422 | * ancillary data (see Section xxxx). | |
1423 | * | |
1424 | * If sd in the close() call is a branched-off socket representing only | |
1425 | * one association, the shutdown is performed on that association only. | |
1426 | * | |
1427 | * 4.1.6 close() - TCP Style Syntax | |
1428 | * | |
1429 | * Applications use close() to gracefully close down an association. | |
1430 | * | |
1431 | * The syntax is: | |
1432 | * | |
1433 | * int close(int sd); | |
1434 | * | |
1435 | * sd - the socket descriptor of the association to be closed. | |
1436 | * | |
1437 | * After an application calls close() on a socket descriptor, no further | |
1438 | * socket operations will succeed on that descriptor. | |
1439 | * | |
1440 | * API 7.1.4 SO_LINGER | |
1441 | * | |
1442 | * An application using the TCP-style socket can use this option to | |
1443 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1444 | * | |
1445 | * struct linger { | |
1446 | * int l_onoff; // option on/off | |
1447 | * int l_linger; // linger time | |
1448 | * }; | |
1449 | * | |
1450 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1451 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1452 | * value is set to a negative value, the setsockopt() call will return | |
1453 | * an error. If the value is set to a positive value linger_time, the | |
1454 | * close() can be blocked for at most linger_time ms. If the graceful | |
1455 | * shutdown phase does not finish during this period, close() will | |
1456 | * return but the graceful shutdown phase continues in the system. | |
1457 | */ | |
dda91928 | 1458 | static void sctp_close(struct sock *sk, long timeout) |
1da177e4 | 1459 | { |
55e26eb9 | 1460 | struct net *net = sock_net(sk); |
1da177e4 LT |
1461 | struct sctp_endpoint *ep; |
1462 | struct sctp_association *asoc; | |
1463 | struct list_head *pos, *temp; | |
cd4fcc70 | 1464 | unsigned int data_was_unread; |
1da177e4 | 1465 | |
bb33381d | 1466 | pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout); |
1da177e4 LT |
1467 | |
1468 | sctp_lock_sock(sk); | |
1469 | sk->sk_shutdown = SHUTDOWN_MASK; | |
bec9640b | 1470 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1471 | |
1472 | ep = sctp_sk(sk)->ep; | |
1473 | ||
cd4fcc70 TG |
1474 | /* Clean up any skbs sitting on the receive queue. */ |
1475 | data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1476 | data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1477 | ||
61c9fed4 | 1478 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1479 | list_for_each_safe(pos, temp, &ep->asocs) { |
1480 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1481 | ||
1482 | if (sctp_style(sk, TCP)) { | |
1483 | /* A closed association can still be in the list if | |
1484 | * it belongs to a TCP-style listening socket that is | |
1485 | * not yet accepted. If so, free it. If not, send an | |
1486 | * ABORT or SHUTDOWN based on the linger options. | |
1487 | */ | |
1488 | if (sctp_state(asoc, CLOSED)) { | |
1489 | sctp_unhash_established(asoc); | |
1490 | sctp_association_free(asoc); | |
b89498a1 VY |
1491 | continue; |
1492 | } | |
1493 | } | |
1da177e4 | 1494 | |
cd4fcc70 TG |
1495 | if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) || |
1496 | !skb_queue_empty(&asoc->ulpq.reasm) || | |
1497 | (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) { | |
b9ac8672 SS |
1498 | struct sctp_chunk *chunk; |
1499 | ||
1500 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1501 | if (chunk) | |
55e26eb9 | 1502 | sctp_primitive_ABORT(net, asoc, chunk); |
b9ac8672 | 1503 | } else |
55e26eb9 | 1504 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1505 | } |
1506 | ||
1da177e4 LT |
1507 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1508 | if (sctp_style(sk, TCP) && timeout) | |
1509 | sctp_wait_for_close(sk, timeout); | |
1510 | ||
1511 | /* This will run the backlog queue. */ | |
1512 | sctp_release_sock(sk); | |
1513 | ||
1514 | /* Supposedly, no process has access to the socket, but | |
1515 | * the net layers still may. | |
1516 | */ | |
1517 | sctp_local_bh_disable(); | |
1518 | sctp_bh_lock_sock(sk); | |
1519 | ||
1520 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1521 | * and we have just a little more cleanup. | |
1522 | */ | |
1523 | sock_hold(sk); | |
1524 | sk_common_release(sk); | |
1525 | ||
1526 | sctp_bh_unlock_sock(sk); | |
1527 | sctp_local_bh_enable(); | |
1528 | ||
1529 | sock_put(sk); | |
1530 | ||
1531 | SCTP_DBG_OBJCNT_DEC(sock); | |
1532 | } | |
1533 | ||
1534 | /* Handle EPIPE error. */ | |
1535 | static int sctp_error(struct sock *sk, int flags, int err) | |
1536 | { | |
1537 | if (err == -EPIPE) | |
1538 | err = sock_error(sk) ? : -EPIPE; | |
1539 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1540 | send_sig(SIGPIPE, current, 0); | |
1541 | return err; | |
1542 | } | |
1543 | ||
1544 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1545 | * | |
1546 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1547 | * and receive data from its peer. | |
1548 | * | |
1549 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1550 | * int flags); | |
1551 | * | |
1552 | * socket - the socket descriptor of the endpoint. | |
1553 | * message - pointer to the msghdr structure which contains a single | |
1554 | * user message and possibly some ancillary data. | |
1555 | * | |
1556 | * See Section 5 for complete description of the data | |
1557 | * structures. | |
1558 | * | |
1559 | * flags - flags sent or received with the user message, see Section | |
1560 | * 5 for complete description of the flags. | |
1561 | * | |
1562 | * Note: This function could use a rewrite especially when explicit | |
1563 | * connect support comes in. | |
1564 | */ | |
1565 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1566 | ||
dda91928 | 1567 | static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); |
1da177e4 | 1568 | |
dda91928 DB |
1569 | static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, |
1570 | struct msghdr *msg, size_t msg_len) | |
1da177e4 | 1571 | { |
55e26eb9 | 1572 | struct net *net = sock_net(sk); |
1da177e4 LT |
1573 | struct sctp_sock *sp; |
1574 | struct sctp_endpoint *ep; | |
1575 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1576 | struct sctp_transport *transport, *chunk_tp; | |
1577 | struct sctp_chunk *chunk; | |
dce116ae | 1578 | union sctp_addr to; |
1da177e4 | 1579 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1580 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1581 | struct sctp_sndrcvinfo *sinfo; |
1582 | struct sctp_initmsg *sinit; | |
1583 | sctp_assoc_t associd = 0; | |
1584 | sctp_cmsgs_t cmsgs = { NULL }; | |
1585 | int err; | |
1586 | sctp_scope_t scope; | |
1587 | long timeo; | |
1588 | __u16 sinfo_flags = 0; | |
1589 | struct sctp_datamsg *datamsg; | |
1da177e4 LT |
1590 | int msg_flags = msg->msg_flags; |
1591 | ||
1da177e4 LT |
1592 | err = 0; |
1593 | sp = sctp_sk(sk); | |
1594 | ep = sp->ep; | |
1595 | ||
bb33381d DB |
1596 | pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk, |
1597 | msg, msg_len, ep); | |
1da177e4 LT |
1598 | |
1599 | /* We cannot send a message over a TCP-style listening socket. */ | |
1600 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1601 | err = -EPIPE; | |
1602 | goto out_nounlock; | |
1603 | } | |
1604 | ||
1605 | /* Parse out the SCTP CMSGs. */ | |
1606 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1da177e4 | 1607 | if (err) { |
bb33381d | 1608 | pr_debug("%s: msghdr parse err:%x\n", __func__, err); |
1da177e4 LT |
1609 | goto out_nounlock; |
1610 | } | |
1611 | ||
1612 | /* Fetch the destination address for this packet. This | |
1613 | * address only selects the association--it is not necessarily | |
1614 | * the address we will send to. | |
1615 | * For a peeled-off socket, msg_name is ignored. | |
1616 | */ | |
1617 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1618 | int msg_namelen = msg->msg_namelen; | |
1619 | ||
1620 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1621 | msg_namelen); | |
1622 | if (err) | |
1623 | return err; | |
1624 | ||
1625 | if (msg_namelen > sizeof(to)) | |
1626 | msg_namelen = sizeof(to); | |
1627 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1628 | msg_name = msg->msg_name; |
1629 | } | |
1630 | ||
1631 | sinfo = cmsgs.info; | |
1632 | sinit = cmsgs.init; | |
1633 | ||
1634 | /* Did the user specify SNDRCVINFO? */ | |
1635 | if (sinfo) { | |
1636 | sinfo_flags = sinfo->sinfo_flags; | |
1637 | associd = sinfo->sinfo_assoc_id; | |
1638 | } | |
1639 | ||
bb33381d DB |
1640 | pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__, |
1641 | msg_len, sinfo_flags); | |
1da177e4 | 1642 | |
eaa5c54d ISJ |
1643 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1644 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1645 | err = -EINVAL; |
1646 | goto out_nounlock; | |
1647 | } | |
1648 | ||
eaa5c54d ISJ |
1649 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1650 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1651 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1652 | * the msg_iov set to the user abort reason. |
d808ad9a | 1653 | */ |
eaa5c54d ISJ |
1654 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1655 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1656 | err = -EINVAL; |
1657 | goto out_nounlock; | |
1658 | } | |
1659 | ||
eaa5c54d | 1660 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1661 | * specified in msg_name. |
1662 | */ | |
eaa5c54d | 1663 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1664 | err = -EINVAL; |
1665 | goto out_nounlock; | |
1666 | } | |
1667 | ||
1668 | transport = NULL; | |
1669 | ||
bb33381d | 1670 | pr_debug("%s: about to look up association\n", __func__); |
1da177e4 LT |
1671 | |
1672 | sctp_lock_sock(sk); | |
1673 | ||
1674 | /* If a msg_name has been specified, assume this is to be used. */ | |
1675 | if (msg_name) { | |
1676 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1677 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1678 | if (!asoc) { |
1679 | /* If we could not find a matching association on the | |
1680 | * endpoint, make sure that it is not a TCP-style | |
1681 | * socket that already has an association or there is | |
1682 | * no peeled-off association on another socket. | |
1683 | */ | |
1684 | if ((sctp_style(sk, TCP) && | |
1685 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1686 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1687 | err = -EADDRNOTAVAIL; |
1688 | goto out_unlock; | |
1689 | } | |
1690 | } | |
1691 | } else { | |
1692 | asoc = sctp_id2assoc(sk, associd); | |
1693 | if (!asoc) { | |
1694 | err = -EPIPE; | |
1695 | goto out_unlock; | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | if (asoc) { | |
bb33381d | 1700 | pr_debug("%s: just looked up association:%p\n", __func__, asoc); |
1da177e4 LT |
1701 | |
1702 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1703 | * socket that has an association in CLOSED state. This can | |
1704 | * happen when an accepted socket has an association that is | |
1705 | * already CLOSED. | |
1706 | */ | |
1707 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1708 | err = -EPIPE; | |
1709 | goto out_unlock; | |
1710 | } | |
1711 | ||
eaa5c54d | 1712 | if (sinfo_flags & SCTP_EOF) { |
bb33381d DB |
1713 | pr_debug("%s: shutting down association:%p\n", |
1714 | __func__, asoc); | |
1715 | ||
55e26eb9 | 1716 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1717 | err = 0; |
1718 | goto out_unlock; | |
1719 | } | |
eaa5c54d | 1720 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1721 | |
1722 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1723 | if (!chunk) { | |
1724 | err = -ENOMEM; | |
1725 | goto out_unlock; | |
1726 | } | |
1727 | ||
bb33381d DB |
1728 | pr_debug("%s: aborting association:%p\n", |
1729 | __func__, asoc); | |
1730 | ||
55e26eb9 | 1731 | sctp_primitive_ABORT(net, asoc, chunk); |
1da177e4 LT |
1732 | err = 0; |
1733 | goto out_unlock; | |
1734 | } | |
1735 | } | |
1736 | ||
1737 | /* Do we need to create the association? */ | |
1738 | if (!asoc) { | |
bb33381d | 1739 | pr_debug("%s: there is no association yet\n", __func__); |
1da177e4 | 1740 | |
eaa5c54d | 1741 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1742 | err = -EINVAL; |
1743 | goto out_unlock; | |
1744 | } | |
1745 | ||
1746 | /* Check for invalid stream against the stream counts, | |
1747 | * either the default or the user specified stream counts. | |
1748 | */ | |
1749 | if (sinfo) { | |
1750 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1751 | /* Check against the defaults. */ | |
1752 | if (sinfo->sinfo_stream >= | |
1753 | sp->initmsg.sinit_num_ostreams) { | |
1754 | err = -EINVAL; | |
1755 | goto out_unlock; | |
1756 | } | |
1757 | } else { | |
1758 | /* Check against the requested. */ | |
1759 | if (sinfo->sinfo_stream >= | |
1760 | sinit->sinit_num_ostreams) { | |
1761 | err = -EINVAL; | |
1762 | goto out_unlock; | |
1763 | } | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | /* | |
1768 | * API 3.1.2 bind() - UDP Style Syntax | |
1769 | * If a bind() or sctp_bindx() is not called prior to a | |
1770 | * sendmsg() call that initiates a new association, the | |
1771 | * system picks an ephemeral port and will choose an address | |
1772 | * set equivalent to binding with a wildcard address. | |
1773 | */ | |
1774 | if (!ep->base.bind_addr.port) { | |
1775 | if (sctp_autobind(sk)) { | |
1776 | err = -EAGAIN; | |
1777 | goto out_unlock; | |
1778 | } | |
64a0c1c8 ISJ |
1779 | } else { |
1780 | /* | |
1781 | * If an unprivileged user inherits a one-to-many | |
1782 | * style socket with open associations on a privileged | |
1783 | * port, it MAY be permitted to accept new associations, | |
1784 | * but it SHOULD NOT be permitted to open new | |
1785 | * associations. | |
1786 | */ | |
1787 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1788 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1789 | err = -EACCES; |
1790 | goto out_unlock; | |
1791 | } | |
1da177e4 LT |
1792 | } |
1793 | ||
1794 | scope = sctp_scope(&to); | |
1795 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1796 | if (!new_asoc) { | |
1797 | err = -ENOMEM; | |
1798 | goto out_unlock; | |
1799 | } | |
1800 | asoc = new_asoc; | |
409b95af VY |
1801 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1802 | if (err < 0) { | |
1803 | err = -ENOMEM; | |
1804 | goto out_free; | |
1805 | } | |
1da177e4 LT |
1806 | |
1807 | /* If the SCTP_INIT ancillary data is specified, set all | |
1808 | * the association init values accordingly. | |
1809 | */ | |
1810 | if (sinit) { | |
1811 | if (sinit->sinit_num_ostreams) { | |
1812 | asoc->c.sinit_num_ostreams = | |
1813 | sinit->sinit_num_ostreams; | |
1814 | } | |
1815 | if (sinit->sinit_max_instreams) { | |
1816 | asoc->c.sinit_max_instreams = | |
1817 | sinit->sinit_max_instreams; | |
1818 | } | |
1819 | if (sinit->sinit_max_attempts) { | |
1820 | asoc->max_init_attempts | |
1821 | = sinit->sinit_max_attempts; | |
1822 | } | |
1823 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1824 | asoc->max_init_timeo = |
1da177e4 LT |
1825 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1826 | } | |
1827 | } | |
1828 | ||
1829 | /* Prime the peer's transport structures. */ | |
dce116ae | 1830 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1831 | if (!transport) { |
1832 | err = -ENOMEM; | |
1833 | goto out_free; | |
1834 | } | |
1da177e4 LT |
1835 | } |
1836 | ||
1837 | /* ASSERT: we have a valid association at this point. */ | |
bb33381d | 1838 | pr_debug("%s: we have a valid association\n", __func__); |
1da177e4 LT |
1839 | |
1840 | if (!sinfo) { | |
1841 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1842 | * some defaults. | |
1843 | */ | |
517aa0bc | 1844 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1845 | default_sinfo.sinfo_stream = asoc->default_stream; |
1846 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1847 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1848 | default_sinfo.sinfo_context = asoc->default_context; | |
1849 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1850 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1851 | sinfo = &default_sinfo; | |
1852 | } | |
1853 | ||
1854 | /* API 7.1.7, the sndbuf size per association bounds the | |
1855 | * maximum size of data that can be sent in a single send call. | |
1856 | */ | |
1857 | if (msg_len > sk->sk_sndbuf) { | |
1858 | err = -EMSGSIZE; | |
1859 | goto out_free; | |
1860 | } | |
1861 | ||
8a479491 | 1862 | if (asoc->pmtu_pending) |
02f3d4ce | 1863 | sctp_assoc_pending_pmtu(sk, asoc); |
8a479491 | 1864 | |
1da177e4 LT |
1865 | /* If fragmentation is disabled and the message length exceeds the |
1866 | * association fragmentation point, return EMSGSIZE. The I-D | |
1867 | * does not specify what this error is, but this looks like | |
1868 | * a great fit. | |
1869 | */ | |
1870 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1871 | err = -EMSGSIZE; | |
1872 | goto out_free; | |
1873 | } | |
1874 | ||
afd7614c JP |
1875 | /* Check for invalid stream. */ |
1876 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1877 | err = -EINVAL; | |
1878 | goto out_free; | |
1da177e4 LT |
1879 | } |
1880 | ||
1881 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1882 | if (!sctp_wspace(asoc)) { | |
1883 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1884 | if (err) | |
1885 | goto out_free; | |
1886 | } | |
1887 | ||
1888 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1889 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1890 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1891 | */ |
1892 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1893 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1894 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1895 | if (!chunk_tp) { |
1896 | err = -EINVAL; | |
1897 | goto out_free; | |
1898 | } | |
1899 | } else | |
1900 | chunk_tp = NULL; | |
1901 | ||
1902 | /* Auto-connect, if we aren't connected already. */ | |
1903 | if (sctp_state(asoc, CLOSED)) { | |
55e26eb9 | 1904 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
1da177e4 LT |
1905 | if (err < 0) |
1906 | goto out_free; | |
bb33381d DB |
1907 | |
1908 | pr_debug("%s: we associated primitively\n", __func__); | |
1da177e4 LT |
1909 | } |
1910 | ||
1911 | /* Break the message into multiple chunks of maximum size. */ | |
1912 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
6e51fe75 TR |
1913 | if (IS_ERR(datamsg)) { |
1914 | err = PTR_ERR(datamsg); | |
1da177e4 LT |
1915 | goto out_free; |
1916 | } | |
1917 | ||
1918 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1919 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
80445cfb | 1920 | sctp_chunk_hold(chunk); |
1da177e4 LT |
1921 | |
1922 | /* Do accounting for the write space. */ | |
1923 | sctp_set_owner_w(chunk); | |
1924 | ||
1925 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1926 | } |
1927 | ||
9c5c62be VY |
1928 | /* Send it to the lower layers. Note: all chunks |
1929 | * must either fail or succeed. The lower layer | |
1930 | * works that way today. Keep it that way or this | |
1931 | * breaks. | |
1932 | */ | |
55e26eb9 | 1933 | err = sctp_primitive_SEND(net, asoc, datamsg); |
9c5c62be | 1934 | /* Did the lower layer accept the chunk? */ |
bb33381d | 1935 | if (err) { |
9c5c62be | 1936 | sctp_datamsg_free(datamsg); |
bb33381d DB |
1937 | goto out_free; |
1938 | } | |
9c5c62be | 1939 | |
bb33381d | 1940 | pr_debug("%s: we sent primitively\n", __func__); |
9c5c62be | 1941 | |
bb33381d DB |
1942 | sctp_datamsg_put(datamsg); |
1943 | err = msg_len; | |
1da177e4 LT |
1944 | |
1945 | /* If we are already past ASSOCIATE, the lower | |
1946 | * layers are responsible for association cleanup. | |
1947 | */ | |
1948 | goto out_unlock; | |
1949 | ||
1950 | out_free: | |
2eebc1e1 NH |
1951 | if (new_asoc) { |
1952 | sctp_unhash_established(asoc); | |
1da177e4 | 1953 | sctp_association_free(asoc); |
2eebc1e1 | 1954 | } |
1da177e4 LT |
1955 | out_unlock: |
1956 | sctp_release_sock(sk); | |
1957 | ||
1958 | out_nounlock: | |
1959 | return sctp_error(sk, msg_flags, err); | |
1960 | ||
1961 | #if 0 | |
1962 | do_sock_err: | |
1963 | if (msg_len) | |
1964 | err = msg_len; | |
1965 | else | |
1966 | err = sock_error(sk); | |
1967 | goto out; | |
1968 | ||
1969 | do_interrupted: | |
1970 | if (msg_len) | |
1971 | err = msg_len; | |
1972 | goto out; | |
1973 | #endif /* 0 */ | |
1974 | } | |
1975 | ||
1976 | /* This is an extended version of skb_pull() that removes the data from the | |
1977 | * start of a skb even when data is spread across the list of skb's in the | |
1978 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1979 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1980 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1981 | * could not be removed. | |
1982 | */ | |
1983 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1984 | { | |
1985 | struct sk_buff *list; | |
1986 | int skb_len = skb_headlen(skb); | |
1987 | int rlen; | |
1988 | ||
1989 | if (len <= skb_len) { | |
1990 | __skb_pull(skb, len); | |
1991 | return 0; | |
1992 | } | |
1993 | len -= skb_len; | |
1994 | __skb_pull(skb, skb_len); | |
1995 | ||
1b003be3 | 1996 | skb_walk_frags(skb, list) { |
1da177e4 LT |
1997 | rlen = sctp_skb_pull(list, len); |
1998 | skb->len -= (len-rlen); | |
1999 | skb->data_len -= (len-rlen); | |
2000 | ||
2001 | if (!rlen) | |
2002 | return 0; | |
2003 | ||
2004 | len = rlen; | |
2005 | } | |
2006 | ||
2007 | return len; | |
2008 | } | |
2009 | ||
2010 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
2011 | * | |
2012 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
2013 | * int flags); | |
2014 | * | |
2015 | * socket - the socket descriptor of the endpoint. | |
2016 | * message - pointer to the msghdr structure which contains a single | |
2017 | * user message and possibly some ancillary data. | |
2018 | * | |
2019 | * See Section 5 for complete description of the data | |
2020 | * structures. | |
2021 | * | |
2022 | * flags - flags sent or received with the user message, see Section | |
2023 | * 5 for complete description of the flags. | |
2024 | */ | |
2025 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
2026 | ||
dda91928 DB |
2027 | static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, |
2028 | struct msghdr *msg, size_t len, int noblock, | |
2029 | int flags, int *addr_len) | |
1da177e4 LT |
2030 | { |
2031 | struct sctp_ulpevent *event = NULL; | |
2032 | struct sctp_sock *sp = sctp_sk(sk); | |
2033 | struct sk_buff *skb; | |
2034 | int copied; | |
2035 | int err = 0; | |
2036 | int skb_len; | |
2037 | ||
bb33381d DB |
2038 | pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, " |
2039 | "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags, | |
2040 | addr_len); | |
1da177e4 LT |
2041 | |
2042 | sctp_lock_sock(sk); | |
2043 | ||
2044 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
2045 | err = -ENOTCONN; | |
2046 | goto out; | |
2047 | } | |
2048 | ||
2049 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
2050 | if (!skb) | |
2051 | goto out; | |
2052 | ||
2053 | /* Get the total length of the skb including any skb's in the | |
2054 | * frag_list. | |
2055 | */ | |
2056 | skb_len = skb->len; | |
2057 | ||
2058 | copied = skb_len; | |
2059 | if (copied > len) | |
2060 | copied = len; | |
2061 | ||
2062 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2063 | ||
2064 | event = sctp_skb2event(skb); | |
2065 | ||
2066 | if (err) | |
2067 | goto out_free; | |
2068 | ||
3b885787 | 2069 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2070 | if (sctp_ulpevent_is_notification(event)) { |
2071 | msg->msg_flags |= MSG_NOTIFICATION; | |
2072 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
2073 | } else { | |
2074 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
2075 | } | |
2076 | ||
2077 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
2078 | if (sp->subscribe.sctp_data_io_event) | |
2079 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
2080 | #if 0 | |
2081 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
2082 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
2083 | ip_cmsg_recv(msg, skb); | |
2084 | #endif | |
2085 | ||
2086 | err = copied; | |
2087 | ||
2088 | /* If skb's length exceeds the user's buffer, update the skb and | |
2089 | * push it back to the receive_queue so that the next call to | |
2090 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2091 | */ | |
2092 | if (skb_len > copied) { | |
2093 | msg->msg_flags &= ~MSG_EOR; | |
2094 | if (flags & MSG_PEEK) | |
2095 | goto out_free; | |
2096 | sctp_skb_pull(skb, copied); | |
2097 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2098 | ||
2099 | /* When only partial message is copied to the user, increase | |
2100 | * rwnd by that amount. If all the data in the skb is read, | |
2101 | * rwnd is updated when the event is freed. | |
2102 | */ | |
0eca8fee VY |
2103 | if (!sctp_ulpevent_is_notification(event)) |
2104 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2105 | goto out; |
2106 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2107 | (event->msg_flags & MSG_EOR)) | |
2108 | msg->msg_flags |= MSG_EOR; | |
2109 | else | |
2110 | msg->msg_flags &= ~MSG_EOR; | |
2111 | ||
2112 | out_free: | |
2113 | if (flags & MSG_PEEK) { | |
2114 | /* Release the skb reference acquired after peeking the skb in | |
2115 | * sctp_skb_recv_datagram(). | |
2116 | */ | |
2117 | kfree_skb(skb); | |
2118 | } else { | |
2119 | /* Free the event which includes releasing the reference to | |
2120 | * the owner of the skb, freeing the skb and updating the | |
2121 | * rwnd. | |
2122 | */ | |
2123 | sctp_ulpevent_free(event); | |
2124 | } | |
2125 | out: | |
2126 | sctp_release_sock(sk); | |
2127 | return err; | |
2128 | } | |
2129 | ||
2130 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2131 | * | |
2132 | * This option is a on/off flag. If enabled no SCTP message | |
2133 | * fragmentation will be performed. Instead if a message being sent | |
2134 | * exceeds the current PMTU size, the message will NOT be sent and | |
2135 | * instead a error will be indicated to the user. | |
2136 | */ | |
2137 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2138 | char __user *optval, |
2139 | unsigned int optlen) | |
1da177e4 LT |
2140 | { |
2141 | int val; | |
2142 | ||
2143 | if (optlen < sizeof(int)) | |
2144 | return -EINVAL; | |
2145 | ||
2146 | if (get_user(val, (int __user *)optval)) | |
2147 | return -EFAULT; | |
2148 | ||
2149 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2150 | ||
2151 | return 0; | |
2152 | } | |
2153 | ||
2154 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2155 | unsigned int optlen) |
1da177e4 | 2156 | { |
94912301 WY |
2157 | struct sctp_association *asoc; |
2158 | struct sctp_ulpevent *event; | |
2159 | ||
7e8616d8 | 2160 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2161 | return -EINVAL; |
2162 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2163 | return -EFAULT; | |
94912301 WY |
2164 | |
2165 | /* | |
2166 | * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT, | |
2167 | * if there is no data to be sent or retransmit, the stack will | |
2168 | * immediately send up this notification. | |
2169 | */ | |
2170 | if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT, | |
2171 | &sctp_sk(sk)->subscribe)) { | |
2172 | asoc = sctp_id2assoc(sk, 0); | |
2173 | ||
2174 | if (asoc && sctp_outq_is_empty(&asoc->outqueue)) { | |
2175 | event = sctp_ulpevent_make_sender_dry_event(asoc, | |
2176 | GFP_ATOMIC); | |
2177 | if (!event) | |
2178 | return -ENOMEM; | |
2179 | ||
2180 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
2181 | } | |
2182 | } | |
2183 | ||
1da177e4 LT |
2184 | return 0; |
2185 | } | |
2186 | ||
2187 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2188 | * | |
2189 | * This socket option is applicable to the UDP-style socket only. When | |
2190 | * set it will cause associations that are idle for more than the | |
2191 | * specified number of seconds to automatically close. An association | |
2192 | * being idle is defined an association that has NOT sent or received | |
2193 | * user data. The special value of '0' indicates that no automatic | |
2194 | * close of any associations should be performed. The option expects an | |
2195 | * integer defining the number of seconds of idle time before an | |
2196 | * association is closed. | |
2197 | */ | |
2198 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2199 | unsigned int optlen) |
1da177e4 LT |
2200 | { |
2201 | struct sctp_sock *sp = sctp_sk(sk); | |
2202 | ||
2203 | /* Applicable to UDP-style socket only */ | |
2204 | if (sctp_style(sk, TCP)) | |
2205 | return -EOPNOTSUPP; | |
2206 | if (optlen != sizeof(int)) | |
2207 | return -EINVAL; | |
2208 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2209 | return -EFAULT; | |
2210 | ||
1da177e4 LT |
2211 | return 0; |
2212 | } | |
2213 | ||
2214 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2215 | * | |
2216 | * Applications can enable or disable heartbeats for any peer address of | |
2217 | * an association, modify an address's heartbeat interval, force a | |
2218 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2219 | * number of retransmissions sent before an address is considered | |
2220 | * unreachable. The following structure is used to access and modify an | |
2221 | * address's parameters: | |
2222 | * | |
2223 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2224 | * sctp_assoc_t spp_assoc_id; |
2225 | * struct sockaddr_storage spp_address; | |
2226 | * uint32_t spp_hbinterval; | |
2227 | * uint16_t spp_pathmaxrxt; | |
2228 | * uint32_t spp_pathmtu; | |
2229 | * uint32_t spp_sackdelay; | |
2230 | * uint32_t spp_flags; | |
2231 | * }; | |
2232 | * | |
2233 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2234 | * application, and identifies the association for | |
2235 | * this query. | |
1da177e4 LT |
2236 | * spp_address - This specifies which address is of interest. |
2237 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2238 | * in milliseconds. If a value of zero |
2239 | * is present in this field then no changes are to | |
2240 | * be made to this parameter. | |
1da177e4 LT |
2241 | * spp_pathmaxrxt - This contains the maximum number of |
2242 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2243 | * considered unreachable. If a value of zero |
2244 | * is present in this field then no changes are to | |
2245 | * be made to this parameter. | |
2246 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2247 | * specified here will be the "fixed" path mtu. | |
2248 | * Note that if the spp_address field is empty | |
2249 | * then all associations on this address will | |
2250 | * have this fixed path mtu set upon them. | |
2251 | * | |
2252 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2253 | * the number of milliseconds that sacks will be delayed | |
2254 | * for. This value will apply to all addresses of an | |
2255 | * association if the spp_address field is empty. Note | |
2256 | * also, that if delayed sack is enabled and this | |
2257 | * value is set to 0, no change is made to the last | |
2258 | * recorded delayed sack timer value. | |
2259 | * | |
2260 | * spp_flags - These flags are used to control various features | |
2261 | * on an association. The flag field may contain | |
2262 | * zero or more of the following options. | |
2263 | * | |
2264 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2265 | * specified address. Note that if the address | |
2266 | * field is empty all addresses for the association | |
2267 | * have heartbeats enabled upon them. | |
2268 | * | |
2269 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2270 | * speicifed address. Note that if the address | |
2271 | * field is empty all addresses for the association | |
2272 | * will have their heartbeats disabled. Note also | |
2273 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2274 | * mutually exclusive, only one of these two should | |
2275 | * be specified. Enabling both fields will have | |
2276 | * undetermined results. | |
2277 | * | |
2278 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2279 | * to be made immediately. | |
2280 | * | |
bdf3092a VY |
2281 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2282 | * heartbeat delayis to be set to the value of 0 | |
2283 | * milliseconds. | |
2284 | * | |
52ccb8e9 FF |
2285 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2286 | * discovery upon the specified address. Note that | |
2287 | * if the address feild is empty then all addresses | |
2288 | * on the association are effected. | |
2289 | * | |
2290 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2291 | * discovery upon the specified address. Note that | |
2292 | * if the address feild is empty then all addresses | |
2293 | * on the association are effected. Not also that | |
2294 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2295 | * exclusive. Enabling both will have undetermined | |
2296 | * results. | |
2297 | * | |
2298 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2299 | * on delayed sack. The time specified in spp_sackdelay | |
2300 | * is used to specify the sack delay for this address. Note | |
2301 | * that if spp_address is empty then all addresses will | |
2302 | * enable delayed sack and take on the sack delay | |
2303 | * value specified in spp_sackdelay. | |
2304 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2305 | * off delayed sack. If the spp_address field is blank then | |
2306 | * delayed sack is disabled for the entire association. Note | |
2307 | * also that this field is mutually exclusive to | |
2308 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2309 | * results. | |
1da177e4 | 2310 | */ |
16164366 AB |
2311 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2312 | struct sctp_transport *trans, | |
2313 | struct sctp_association *asoc, | |
2314 | struct sctp_sock *sp, | |
2315 | int hb_change, | |
2316 | int pmtud_change, | |
2317 | int sackdelay_change) | |
52ccb8e9 FF |
2318 | { |
2319 | int error; | |
2320 | ||
2321 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
55e26eb9 EB |
2322 | struct net *net = sock_net(trans->asoc->base.sk); |
2323 | ||
2324 | error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans); | |
52ccb8e9 FF |
2325 | if (error) |
2326 | return error; | |
2327 | } | |
2328 | ||
bdf3092a VY |
2329 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2330 | * this field is ignored. Note also that a value of zero indicates | |
2331 | * the current setting should be left unchanged. | |
2332 | */ | |
2333 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2334 | ||
2335 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2336 | * set. This lets us use 0 value when this flag | |
2337 | * is set. | |
2338 | */ | |
2339 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2340 | params->spp_hbinterval = 0; | |
2341 | ||
2342 | if (params->spp_hbinterval || | |
2343 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2344 | if (trans) { | |
2345 | trans->hbinterval = | |
2346 | msecs_to_jiffies(params->spp_hbinterval); | |
2347 | } else if (asoc) { | |
2348 | asoc->hbinterval = | |
2349 | msecs_to_jiffies(params->spp_hbinterval); | |
2350 | } else { | |
2351 | sp->hbinterval = params->spp_hbinterval; | |
2352 | } | |
52ccb8e9 FF |
2353 | } |
2354 | } | |
2355 | ||
2356 | if (hb_change) { | |
2357 | if (trans) { | |
2358 | trans->param_flags = | |
2359 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2360 | } else if (asoc) { | |
2361 | asoc->param_flags = | |
2362 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2363 | } else { | |
2364 | sp->param_flags = | |
2365 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2366 | } | |
2367 | } | |
2368 | ||
bdf3092a VY |
2369 | /* When Path MTU discovery is disabled the value specified here will |
2370 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2371 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2372 | * effect). | |
2373 | */ | |
2374 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2375 | if (trans) { |
2376 | trans->pathmtu = params->spp_pathmtu; | |
02f3d4ce | 2377 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2378 | } else if (asoc) { |
2379 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2380 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2381 | } else { |
2382 | sp->pathmtu = params->spp_pathmtu; | |
2383 | } | |
2384 | } | |
2385 | ||
2386 | if (pmtud_change) { | |
2387 | if (trans) { | |
2388 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2389 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2390 | trans->param_flags = | |
2391 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2392 | if (update) { | |
9914ae3c | 2393 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
02f3d4ce | 2394 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2395 | } |
2396 | } else if (asoc) { | |
2397 | asoc->param_flags = | |
2398 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2399 | } else { | |
2400 | sp->param_flags = | |
2401 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2402 | } | |
2403 | } | |
2404 | ||
bdf3092a VY |
2405 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2406 | * value of this field is ignored. Note also that a value of zero | |
2407 | * indicates the current setting should be left unchanged. | |
2408 | */ | |
2409 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2410 | if (trans) { |
2411 | trans->sackdelay = | |
2412 | msecs_to_jiffies(params->spp_sackdelay); | |
2413 | } else if (asoc) { | |
2414 | asoc->sackdelay = | |
2415 | msecs_to_jiffies(params->spp_sackdelay); | |
2416 | } else { | |
2417 | sp->sackdelay = params->spp_sackdelay; | |
2418 | } | |
2419 | } | |
2420 | ||
2421 | if (sackdelay_change) { | |
2422 | if (trans) { | |
2423 | trans->param_flags = | |
2424 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2425 | sackdelay_change; | |
2426 | } else if (asoc) { | |
2427 | asoc->param_flags = | |
2428 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2429 | sackdelay_change; | |
2430 | } else { | |
2431 | sp->param_flags = | |
2432 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2433 | sackdelay_change; | |
2434 | } | |
2435 | } | |
2436 | ||
37051f73 APO |
2437 | /* Note that a value of zero indicates the current setting should be |
2438 | left unchanged. | |
bdf3092a | 2439 | */ |
37051f73 | 2440 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2441 | if (trans) { |
2442 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2443 | } else if (asoc) { | |
2444 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2445 | } else { | |
2446 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2447 | } | |
2448 | } | |
2449 | ||
2450 | return 0; | |
2451 | } | |
2452 | ||
1da177e4 | 2453 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2454 | char __user *optval, |
2455 | unsigned int optlen) | |
1da177e4 | 2456 | { |
52ccb8e9 FF |
2457 | struct sctp_paddrparams params; |
2458 | struct sctp_transport *trans = NULL; | |
2459 | struct sctp_association *asoc = NULL; | |
2460 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2461 | int error; |
52ccb8e9 | 2462 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2463 | |
2464 | if (optlen != sizeof(struct sctp_paddrparams)) | |
52ccb8e9 FF |
2465 | return - EINVAL; |
2466 | ||
1da177e4 LT |
2467 | if (copy_from_user(¶ms, optval, optlen)) |
2468 | return -EFAULT; | |
2469 | ||
52ccb8e9 FF |
2470 | /* Validate flags and value parameters. */ |
2471 | hb_change = params.spp_flags & SPP_HB; | |
2472 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2473 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2474 | ||
2475 | if (hb_change == SPP_HB || | |
2476 | pmtud_change == SPP_PMTUD || | |
2477 | sackdelay_change == SPP_SACKDELAY || | |
2478 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2479 | (params.spp_pathmtu && |
2480 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2481 | return -EINVAL; |
1da177e4 | 2482 | |
52ccb8e9 FF |
2483 | /* If an address other than INADDR_ANY is specified, and |
2484 | * no transport is found, then the request is invalid. | |
2485 | */ | |
52cae8f0 | 2486 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2487 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2488 | params.spp_assoc_id); | |
2489 | if (!trans) | |
1da177e4 | 2490 | return -EINVAL; |
1da177e4 LT |
2491 | } |
2492 | ||
52ccb8e9 FF |
2493 | /* Get association, if assoc_id != 0 and the socket is a one |
2494 | * to many style socket, and an association was not found, then | |
2495 | * the id was invalid. | |
2496 | */ | |
2497 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2498 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2499 | return -EINVAL; |
2500 | ||
52ccb8e9 FF |
2501 | /* Heartbeat demand can only be sent on a transport or |
2502 | * association, but not a socket. | |
1da177e4 | 2503 | */ |
52ccb8e9 FF |
2504 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2505 | return -EINVAL; | |
2506 | ||
2507 | /* Process parameters. */ | |
2508 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2509 | hb_change, pmtud_change, | |
2510 | sackdelay_change); | |
1da177e4 | 2511 | |
52ccb8e9 FF |
2512 | if (error) |
2513 | return error; | |
2514 | ||
2515 | /* If changes are for association, also apply parameters to each | |
2516 | * transport. | |
1da177e4 | 2517 | */ |
52ccb8e9 | 2518 | if (!trans && asoc) { |
9dbc15f0 RD |
2519 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2520 | transports) { | |
52ccb8e9 FF |
2521 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2522 | hb_change, pmtud_change, | |
2523 | sackdelay_change); | |
2524 | } | |
2525 | } | |
1da177e4 LT |
2526 | |
2527 | return 0; | |
2528 | } | |
2529 | ||
d364d927 WY |
2530 | /* |
2531 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2532 | * | |
2533 | * This option will effect the way delayed acks are performed. This | |
2534 | * option allows you to get or set the delayed ack time, in | |
2535 | * milliseconds. It also allows changing the delayed ack frequency. | |
2536 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2537 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2538 | * values. If the assoc_id field is non-zero, then the set or get | |
2539 | * effects the specified association for the one to many model (the | |
2540 | * assoc_id field is ignored by the one to one model). Note that if | |
2541 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2542 | * current values will remain unchanged. | |
2543 | * | |
2544 | * struct sctp_sack_info { | |
2545 | * sctp_assoc_t sack_assoc_id; | |
2546 | * uint32_t sack_delay; | |
2547 | * uint32_t sack_freq; | |
2548 | * }; | |
2549 | * | |
2550 | * sack_assoc_id - This parameter, indicates which association the user | |
2551 | * is performing an action upon. Note that if this field's value is | |
2552 | * zero then the endpoints default value is changed (effecting future | |
2553 | * associations only). | |
2554 | * | |
2555 | * sack_delay - This parameter contains the number of milliseconds that | |
2556 | * the user is requesting the delayed ACK timer be set to. Note that | |
2557 | * this value is defined in the standard to be between 200 and 500 | |
2558 | * milliseconds. | |
2559 | * | |
2560 | * sack_freq - This parameter contains the number of packets that must | |
2561 | * be received before a sack is sent without waiting for the delay | |
2562 | * timer to expire. The default value for this is 2, setting this | |
2563 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2564 | */ |
2565 | ||
d364d927 | 2566 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2567 | char __user *optval, unsigned int optlen) |
7708610b | 2568 | { |
d364d927 | 2569 | struct sctp_sack_info params; |
7708610b FF |
2570 | struct sctp_transport *trans = NULL; |
2571 | struct sctp_association *asoc = NULL; | |
2572 | struct sctp_sock *sp = sctp_sk(sk); | |
2573 | ||
d364d927 WY |
2574 | if (optlen == sizeof(struct sctp_sack_info)) { |
2575 | if (copy_from_user(¶ms, optval, optlen)) | |
2576 | return -EFAULT; | |
7708610b | 2577 | |
d364d927 WY |
2578 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2579 | return 0; | |
2580 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
2581 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
2582 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
2583 | if (copy_from_user(¶ms, optval, optlen)) |
2584 | return -EFAULT; | |
2585 | ||
2586 | if (params.sack_delay == 0) | |
2587 | params.sack_freq = 1; | |
2588 | else | |
2589 | params.sack_freq = 0; | |
2590 | } else | |
2591 | return - EINVAL; | |
7708610b FF |
2592 | |
2593 | /* Validate value parameter. */ | |
d364d927 | 2594 | if (params.sack_delay > 500) |
7708610b FF |
2595 | return -EINVAL; |
2596 | ||
d364d927 | 2597 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2598 | * to many style socket, and an association was not found, then |
2599 | * the id was invalid. | |
d808ad9a | 2600 | */ |
d364d927 WY |
2601 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2602 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2603 | return -EINVAL; |
2604 | ||
d364d927 | 2605 | if (params.sack_delay) { |
7708610b FF |
2606 | if (asoc) { |
2607 | asoc->sackdelay = | |
d364d927 | 2608 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2609 | asoc->param_flags = |
7708610b FF |
2610 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2611 | SPP_SACKDELAY_ENABLE; | |
2612 | } else { | |
d364d927 | 2613 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2614 | sp->param_flags = |
7708610b FF |
2615 | (sp->param_flags & ~SPP_SACKDELAY) | |
2616 | SPP_SACKDELAY_ENABLE; | |
2617 | } | |
d364d927 WY |
2618 | } |
2619 | ||
2620 | if (params.sack_freq == 1) { | |
7708610b | 2621 | if (asoc) { |
d808ad9a | 2622 | asoc->param_flags = |
7708610b FF |
2623 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2624 | SPP_SACKDELAY_DISABLE; | |
2625 | } else { | |
d808ad9a | 2626 | sp->param_flags = |
7708610b FF |
2627 | (sp->param_flags & ~SPP_SACKDELAY) | |
2628 | SPP_SACKDELAY_DISABLE; | |
2629 | } | |
d364d927 WY |
2630 | } else if (params.sack_freq > 1) { |
2631 | if (asoc) { | |
2632 | asoc->sackfreq = params.sack_freq; | |
2633 | asoc->param_flags = | |
2634 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2635 | SPP_SACKDELAY_ENABLE; | |
2636 | } else { | |
2637 | sp->sackfreq = params.sack_freq; | |
2638 | sp->param_flags = | |
2639 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2640 | SPP_SACKDELAY_ENABLE; | |
2641 | } | |
7708610b FF |
2642 | } |
2643 | ||
2644 | /* If change is for association, also apply to each transport. */ | |
2645 | if (asoc) { | |
9dbc15f0 RD |
2646 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2647 | transports) { | |
d364d927 | 2648 | if (params.sack_delay) { |
7708610b | 2649 | trans->sackdelay = |
d364d927 | 2650 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2651 | trans->param_flags = |
7708610b FF |
2652 | (trans->param_flags & ~SPP_SACKDELAY) | |
2653 | SPP_SACKDELAY_ENABLE; | |
d364d927 | 2654 | } |
7bfe8bdb | 2655 | if (params.sack_freq == 1) { |
d808ad9a | 2656 | trans->param_flags = |
7708610b FF |
2657 | (trans->param_flags & ~SPP_SACKDELAY) | |
2658 | SPP_SACKDELAY_DISABLE; | |
d364d927 WY |
2659 | } else if (params.sack_freq > 1) { |
2660 | trans->sackfreq = params.sack_freq; | |
2661 | trans->param_flags = | |
2662 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2663 | SPP_SACKDELAY_ENABLE; | |
7708610b FF |
2664 | } |
2665 | } | |
2666 | } | |
d808ad9a | 2667 | |
7708610b FF |
2668 | return 0; |
2669 | } | |
2670 | ||
1da177e4 LT |
2671 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2672 | * | |
2673 | * Applications can specify protocol parameters for the default association | |
2674 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2675 | * is SCTP_INITMSG. | |
2676 | * | |
2677 | * Setting initialization parameters is effective only on an unconnected | |
2678 | * socket (for UDP-style sockets only future associations are effected | |
2679 | * by the change). With TCP-style sockets, this option is inherited by | |
2680 | * sockets derived from a listener socket. | |
2681 | */ | |
b7058842 | 2682 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2683 | { |
2684 | struct sctp_initmsg sinit; | |
2685 | struct sctp_sock *sp = sctp_sk(sk); | |
2686 | ||
2687 | if (optlen != sizeof(struct sctp_initmsg)) | |
2688 | return -EINVAL; | |
2689 | if (copy_from_user(&sinit, optval, optlen)) | |
2690 | return -EFAULT; | |
2691 | ||
2692 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2693 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2694 | if (sinit.sinit_max_instreams) |
d808ad9a | 2695 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2696 | if (sinit.sinit_max_attempts) |
d808ad9a | 2697 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2698 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2699 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2700 | |
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | /* | |
2705 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2706 | * | |
2707 | * Applications that wish to use the sendto() system call may wish to | |
2708 | * specify a default set of parameters that would normally be supplied | |
2709 | * through the inclusion of ancillary data. This socket option allows | |
2710 | * such an application to set the default sctp_sndrcvinfo structure. | |
2711 | * The application that wishes to use this socket option simply passes | |
2712 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2713 | * 5.2.2) The input parameters accepted by this call include | |
2714 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2715 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2716 | * to this call if the caller is using the UDP model. | |
2717 | */ | |
2718 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2719 | char __user *optval, |
2720 | unsigned int optlen) | |
1da177e4 LT |
2721 | { |
2722 | struct sctp_sndrcvinfo info; | |
2723 | struct sctp_association *asoc; | |
2724 | struct sctp_sock *sp = sctp_sk(sk); | |
2725 | ||
2726 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2727 | return -EINVAL; | |
2728 | if (copy_from_user(&info, optval, optlen)) | |
2729 | return -EFAULT; | |
2730 | ||
2731 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2732 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2733 | return -EINVAL; | |
2734 | ||
2735 | if (asoc) { | |
2736 | asoc->default_stream = info.sinfo_stream; | |
2737 | asoc->default_flags = info.sinfo_flags; | |
2738 | asoc->default_ppid = info.sinfo_ppid; | |
2739 | asoc->default_context = info.sinfo_context; | |
2740 | asoc->default_timetolive = info.sinfo_timetolive; | |
2741 | } else { | |
2742 | sp->default_stream = info.sinfo_stream; | |
2743 | sp->default_flags = info.sinfo_flags; | |
2744 | sp->default_ppid = info.sinfo_ppid; | |
2745 | sp->default_context = info.sinfo_context; | |
2746 | sp->default_timetolive = info.sinfo_timetolive; | |
2747 | } | |
2748 | ||
2749 | return 0; | |
2750 | } | |
2751 | ||
2752 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2753 | * | |
2754 | * Requests that the local SCTP stack use the enclosed peer address as | |
2755 | * the association primary. The enclosed address must be one of the | |
2756 | * association peer's addresses. | |
2757 | */ | |
2758 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2759 | unsigned int optlen) |
1da177e4 LT |
2760 | { |
2761 | struct sctp_prim prim; | |
2762 | struct sctp_transport *trans; | |
2763 | ||
2764 | if (optlen != sizeof(struct sctp_prim)) | |
2765 | return -EINVAL; | |
2766 | ||
2767 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2768 | return -EFAULT; | |
2769 | ||
2770 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2771 | if (!trans) | |
2772 | return -EINVAL; | |
2773 | ||
2774 | sctp_assoc_set_primary(trans->asoc, trans); | |
2775 | ||
2776 | return 0; | |
2777 | } | |
2778 | ||
2779 | /* | |
2780 | * 7.1.5 SCTP_NODELAY | |
2781 | * | |
2782 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2783 | * generally sent as soon as possible and no unnecessary delays are | |
2784 | * introduced, at the cost of more packets in the network. Expects an | |
2785 | * integer boolean flag. | |
2786 | */ | |
2787 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2788 | unsigned int optlen) |
1da177e4 LT |
2789 | { |
2790 | int val; | |
2791 | ||
2792 | if (optlen < sizeof(int)) | |
2793 | return -EINVAL; | |
2794 | if (get_user(val, (int __user *)optval)) | |
2795 | return -EFAULT; | |
2796 | ||
2797 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2798 | return 0; | |
2799 | } | |
2800 | ||
2801 | /* | |
2802 | * | |
2803 | * 7.1.1 SCTP_RTOINFO | |
2804 | * | |
2805 | * The protocol parameters used to initialize and bound retransmission | |
2806 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2807 | * and modify these parameters. | |
2808 | * All parameters are time values, in milliseconds. A value of 0, when | |
2809 | * modifying the parameters, indicates that the current value should not | |
2810 | * be changed. | |
2811 | * | |
2812 | */ | |
b7058842 DM |
2813 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2814 | { | |
1da177e4 LT |
2815 | struct sctp_rtoinfo rtoinfo; |
2816 | struct sctp_association *asoc; | |
2817 | ||
2818 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2819 | return -EINVAL; | |
2820 | ||
2821 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2822 | return -EFAULT; | |
2823 | ||
2824 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2825 | ||
2826 | /* Set the values to the specific association */ | |
2827 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2828 | return -EINVAL; | |
2829 | ||
2830 | if (asoc) { | |
2831 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2832 | asoc->rto_initial = |
1da177e4 LT |
2833 | msecs_to_jiffies(rtoinfo.srto_initial); |
2834 | if (rtoinfo.srto_max != 0) | |
2835 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2836 | if (rtoinfo.srto_min != 0) | |
2837 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2838 | } else { | |
2839 | /* If there is no association or the association-id = 0 | |
2840 | * set the values to the endpoint. | |
2841 | */ | |
2842 | struct sctp_sock *sp = sctp_sk(sk); | |
2843 | ||
2844 | if (rtoinfo.srto_initial != 0) | |
2845 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2846 | if (rtoinfo.srto_max != 0) | |
2847 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2848 | if (rtoinfo.srto_min != 0) | |
2849 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2850 | } | |
2851 | ||
2852 | return 0; | |
2853 | } | |
2854 | ||
2855 | /* | |
2856 | * | |
2857 | * 7.1.2 SCTP_ASSOCINFO | |
2858 | * | |
59c51591 | 2859 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2860 | * of the association. |
2861 | * Returns an error if the new association retransmission value is | |
2862 | * greater than the sum of the retransmission value of the peer. | |
2863 | * See [SCTP] for more information. | |
2864 | * | |
2865 | */ | |
b7058842 | 2866 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2867 | { |
2868 | ||
2869 | struct sctp_assocparams assocparams; | |
2870 | struct sctp_association *asoc; | |
2871 | ||
2872 | if (optlen != sizeof(struct sctp_assocparams)) | |
2873 | return -EINVAL; | |
2874 | if (copy_from_user(&assocparams, optval, optlen)) | |
2875 | return -EFAULT; | |
2876 | ||
2877 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2878 | ||
2879 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2880 | return -EINVAL; | |
2881 | ||
2882 | /* Set the values to the specific association */ | |
2883 | if (asoc) { | |
402d68c4 VY |
2884 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2885 | __u32 path_sum = 0; | |
2886 | int paths = 0; | |
402d68c4 VY |
2887 | struct sctp_transport *peer_addr; |
2888 | ||
9dbc15f0 RD |
2889 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2890 | transports) { | |
402d68c4 VY |
2891 | path_sum += peer_addr->pathmaxrxt; |
2892 | paths++; | |
2893 | } | |
2894 | ||
025dfdaf | 2895 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2896 | * one path/transport. We do this because path |
2897 | * retransmissions are only counted when we have more | |
2898 | * then one path. | |
2899 | */ | |
2900 | if (paths > 1 && | |
2901 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2902 | return -EINVAL; | |
2903 | ||
1da177e4 | 2904 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2905 | } |
2906 | ||
52db882f DB |
2907 | if (assocparams.sasoc_cookie_life != 0) |
2908 | asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life); | |
1da177e4 LT |
2909 | } else { |
2910 | /* Set the values to the endpoint */ | |
2911 | struct sctp_sock *sp = sctp_sk(sk); | |
2912 | ||
2913 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2914 | sp->assocparams.sasoc_asocmaxrxt = | |
2915 | assocparams.sasoc_asocmaxrxt; | |
2916 | if (assocparams.sasoc_cookie_life != 0) | |
2917 | sp->assocparams.sasoc_cookie_life = | |
2918 | assocparams.sasoc_cookie_life; | |
2919 | } | |
2920 | return 0; | |
2921 | } | |
2922 | ||
2923 | /* | |
2924 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2925 | * | |
2926 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2927 | * addresses. If this option is turned on and the socket is type | |
2928 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2929 | * If this option is turned off, then no mapping will be done of V4 | |
2930 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2931 | * addresses on the socket. | |
2932 | */ | |
b7058842 | 2933 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2934 | { |
2935 | int val; | |
2936 | struct sctp_sock *sp = sctp_sk(sk); | |
2937 | ||
2938 | if (optlen < sizeof(int)) | |
2939 | return -EINVAL; | |
2940 | if (get_user(val, (int __user *)optval)) | |
2941 | return -EFAULT; | |
2942 | if (val) | |
2943 | sp->v4mapped = 1; | |
2944 | else | |
2945 | sp->v4mapped = 0; | |
2946 | ||
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | /* | |
e89c2095 WY |
2951 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2952 | * This option will get or set the maximum size to put in any outgoing | |
2953 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
2954 | * fragmented by SCTP into the specified size. Note that the underlying |
2955 | * SCTP implementation may fragment into smaller sized chunks when the | |
2956 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
2957 | * the user. The default value for this option is '0' which indicates |
2958 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2959 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2960 | * than the maximum size of an IP datagram will effectively let SCTP | |
2961 | * control fragmentation (i.e. the same as setting this option to 0). | |
2962 | * | |
2963 | * The following structure is used to access and modify this parameter: | |
2964 | * | |
2965 | * struct sctp_assoc_value { | |
2966 | * sctp_assoc_t assoc_id; | |
2967 | * uint32_t assoc_value; | |
2968 | * }; | |
2969 | * | |
2970 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2971 | * For one-to-many style sockets this parameter indicates which | |
2972 | * association the user is performing an action upon. Note that if | |
2973 | * this field's value is zero then the endpoints default value is | |
2974 | * changed (effecting future associations only). | |
2975 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 2976 | */ |
b7058842 | 2977 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 2978 | { |
e89c2095 | 2979 | struct sctp_assoc_value params; |
1da177e4 | 2980 | struct sctp_association *asoc; |
1da177e4 LT |
2981 | struct sctp_sock *sp = sctp_sk(sk); |
2982 | int val; | |
2983 | ||
e89c2095 | 2984 | if (optlen == sizeof(int)) { |
145ce502 JP |
2985 | pr_warn("Use of int in maxseg socket option deprecated\n"); |
2986 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
e89c2095 WY |
2987 | if (copy_from_user(&val, optval, optlen)) |
2988 | return -EFAULT; | |
2989 | params.assoc_id = 0; | |
2990 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2991 | if (copy_from_user(¶ms, optval, optlen)) | |
2992 | return -EFAULT; | |
2993 | val = params.assoc_value; | |
2994 | } else | |
1da177e4 | 2995 | return -EINVAL; |
e89c2095 | 2996 | |
96a33998 | 2997 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 2998 | return -EINVAL; |
1da177e4 | 2999 | |
e89c2095 WY |
3000 | asoc = sctp_id2assoc(sk, params.assoc_id); |
3001 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
3002 | return -EINVAL; | |
3003 | ||
3004 | if (asoc) { | |
3005 | if (val == 0) { | |
3006 | val = asoc->pathmtu; | |
3007 | val -= sp->pf->af->net_header_len; | |
3008 | val -= sizeof(struct sctphdr) + | |
3009 | sizeof(struct sctp_data_chunk); | |
3010 | } | |
f68b2e05 VY |
3011 | asoc->user_frag = val; |
3012 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
3013 | } else { |
3014 | sp->user_frag = val; | |
1da177e4 LT |
3015 | } |
3016 | ||
3017 | return 0; | |
3018 | } | |
3019 | ||
3020 | ||
3021 | /* | |
3022 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
3023 | * | |
3024 | * Requests that the peer mark the enclosed address as the association | |
3025 | * primary. The enclosed address must be one of the association's | |
3026 | * locally bound addresses. The following structure is used to make a | |
3027 | * set primary request: | |
3028 | */ | |
3029 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 3030 | unsigned int optlen) |
1da177e4 | 3031 | { |
e1fc3b14 | 3032 | struct net *net = sock_net(sk); |
1da177e4 | 3033 | struct sctp_sock *sp; |
1da177e4 LT |
3034 | struct sctp_association *asoc = NULL; |
3035 | struct sctp_setpeerprim prim; | |
3036 | struct sctp_chunk *chunk; | |
40a01039 | 3037 | struct sctp_af *af; |
1da177e4 LT |
3038 | int err; |
3039 | ||
3040 | sp = sctp_sk(sk); | |
1da177e4 | 3041 | |
e1fc3b14 | 3042 | if (!net->sctp.addip_enable) |
1da177e4 LT |
3043 | return -EPERM; |
3044 | ||
3045 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
3046 | return -EINVAL; | |
3047 | ||
3048 | if (copy_from_user(&prim, optval, optlen)) | |
3049 | return -EFAULT; | |
3050 | ||
3051 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 3052 | if (!asoc) |
1da177e4 LT |
3053 | return -EINVAL; |
3054 | ||
3055 | if (!asoc->peer.asconf_capable) | |
3056 | return -EPERM; | |
3057 | ||
3058 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
3059 | return -EPERM; | |
3060 | ||
3061 | if (!sctp_state(asoc, ESTABLISHED)) | |
3062 | return -ENOTCONN; | |
3063 | ||
40a01039 WY |
3064 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
3065 | if (!af) | |
3066 | return -EINVAL; | |
3067 | ||
3068 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
3069 | return -EADDRNOTAVAIL; | |
3070 | ||
1da177e4 LT |
3071 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
3072 | return -EADDRNOTAVAIL; | |
3073 | ||
3074 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3075 | chunk = sctp_make_asconf_set_prim(asoc, | |
3076 | (union sctp_addr *)&prim.sspp_addr); | |
3077 | if (!chunk) | |
3078 | return -ENOMEM; | |
3079 | ||
3080 | err = sctp_send_asconf(asoc, chunk); | |
3081 | ||
bb33381d | 3082 | pr_debug("%s: we set peer primary addr primitively\n", __func__); |
1da177e4 LT |
3083 | |
3084 | return err; | |
3085 | } | |
3086 | ||
0f3fffd8 | 3087 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3088 | unsigned int optlen) |
1da177e4 | 3089 | { |
0f3fffd8 | 3090 | struct sctp_setadaptation adaptation; |
1da177e4 | 3091 | |
0f3fffd8 | 3092 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3093 | return -EINVAL; |
0f3fffd8 | 3094 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3095 | return -EFAULT; |
3096 | ||
0f3fffd8 | 3097 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3098 | |
3099 | return 0; | |
3100 | } | |
3101 | ||
6ab792f5 ISJ |
3102 | /* |
3103 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3104 | * | |
3105 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3106 | * used when a failed message is retrieved holding the value that was | |
3107 | * sent down on the actual send call. This option allows the setting of | |
3108 | * a default context on an association basis that will be received on | |
3109 | * reading messages from the peer. This is especially helpful in the | |
3110 | * one-2-many model for an application to keep some reference to an | |
3111 | * internal state machine that is processing messages on the | |
3112 | * association. Note that the setting of this value only effects | |
3113 | * received messages from the peer and does not effect the value that is | |
3114 | * saved with outbound messages. | |
3115 | */ | |
3116 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3117 | unsigned int optlen) |
6ab792f5 ISJ |
3118 | { |
3119 | struct sctp_assoc_value params; | |
3120 | struct sctp_sock *sp; | |
3121 | struct sctp_association *asoc; | |
3122 | ||
3123 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3124 | return -EINVAL; | |
3125 | if (copy_from_user(¶ms, optval, optlen)) | |
3126 | return -EFAULT; | |
3127 | ||
3128 | sp = sctp_sk(sk); | |
3129 | ||
3130 | if (params.assoc_id != 0) { | |
3131 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3132 | if (!asoc) | |
3133 | return -EINVAL; | |
3134 | asoc->default_rcv_context = params.assoc_value; | |
3135 | } else { | |
3136 | sp->default_rcv_context = params.assoc_value; | |
3137 | } | |
3138 | ||
3139 | return 0; | |
3140 | } | |
3141 | ||
b6e1331f VY |
3142 | /* |
3143 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3144 | * | |
3145 | * This options will at a minimum specify if the implementation is doing | |
3146 | * fragmented interleave. Fragmented interleave, for a one to many | |
3147 | * socket, is when subsequent calls to receive a message may return | |
3148 | * parts of messages from different associations. Some implementations | |
3149 | * may allow you to turn this value on or off. If so, when turned off, | |
3150 | * no fragment interleave will occur (which will cause a head of line | |
3151 | * blocking amongst multiple associations sharing the same one to many | |
3152 | * socket). When this option is turned on, then each receive call may | |
3153 | * come from a different association (thus the user must receive data | |
3154 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3155 | * association each receive belongs to. | |
3156 | * | |
3157 | * This option takes a boolean value. A non-zero value indicates that | |
3158 | * fragmented interleave is on. A value of zero indicates that | |
3159 | * fragmented interleave is off. | |
3160 | * | |
3161 | * Note that it is important that an implementation that allows this | |
3162 | * option to be turned on, have it off by default. Otherwise an unaware | |
3163 | * application using the one to many model may become confused and act | |
3164 | * incorrectly. | |
3165 | */ | |
3166 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3167 | char __user *optval, | |
b7058842 | 3168 | unsigned int optlen) |
b6e1331f VY |
3169 | { |
3170 | int val; | |
3171 | ||
3172 | if (optlen != sizeof(int)) | |
3173 | return -EINVAL; | |
3174 | if (get_user(val, (int __user *)optval)) | |
3175 | return -EFAULT; | |
3176 | ||
3177 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3178 | ||
3179 | return 0; | |
3180 | } | |
3181 | ||
d49d91d7 | 3182 | /* |
8510b937 | 3183 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3184 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3185 | * |
d49d91d7 VY |
3186 | * This option will set or get the SCTP partial delivery point. This |
3187 | * point is the size of a message where the partial delivery API will be | |
3188 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3189 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3190 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3191 | * point. Note also that the call will fail if the user attempts to set |
3192 | * this value larger than the socket receive buffer size. | |
3193 | * | |
3194 | * Note that any single message having a length smaller than or equal to | |
3195 | * the SCTP partial delivery point will be delivered in one single read | |
3196 | * call as long as the user provided buffer is large enough to hold the | |
3197 | * message. | |
d49d91d7 VY |
3198 | */ |
3199 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3200 | char __user *optval, | |
b7058842 | 3201 | unsigned int optlen) |
d49d91d7 VY |
3202 | { |
3203 | u32 val; | |
3204 | ||
3205 | if (optlen != sizeof(u32)) | |
3206 | return -EINVAL; | |
3207 | if (get_user(val, (int __user *)optval)) | |
3208 | return -EFAULT; | |
3209 | ||
8510b937 WY |
3210 | /* Note: We double the receive buffer from what the user sets |
3211 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3212 | */ | |
3213 | if (val > (sk->sk_rcvbuf >> 1)) | |
3214 | return -EINVAL; | |
3215 | ||
d49d91d7 VY |
3216 | sctp_sk(sk)->pd_point = val; |
3217 | ||
3218 | return 0; /* is this the right error code? */ | |
3219 | } | |
3220 | ||
70331571 VY |
3221 | /* |
3222 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3223 | * | |
3224 | * This option will allow a user to change the maximum burst of packets | |
3225 | * that can be emitted by this association. Note that the default value | |
3226 | * is 4, and some implementations may restrict this setting so that it | |
3227 | * can only be lowered. | |
3228 | * | |
3229 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3230 | * future associations inheriting the socket value. | |
3231 | */ | |
3232 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3233 | char __user *optval, | |
b7058842 | 3234 | unsigned int optlen) |
70331571 | 3235 | { |
219b99a9 NH |
3236 | struct sctp_assoc_value params; |
3237 | struct sctp_sock *sp; | |
3238 | struct sctp_association *asoc; | |
70331571 | 3239 | int val; |
219b99a9 | 3240 | int assoc_id = 0; |
70331571 | 3241 | |
219b99a9 | 3242 | if (optlen == sizeof(int)) { |
145ce502 JP |
3243 | pr_warn("Use of int in max_burst socket option deprecated\n"); |
3244 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
219b99a9 NH |
3245 | if (copy_from_user(&val, optval, optlen)) |
3246 | return -EFAULT; | |
3247 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3248 | if (copy_from_user(¶ms, optval, optlen)) | |
3249 | return -EFAULT; | |
3250 | val = params.assoc_value; | |
3251 | assoc_id = params.assoc_id; | |
3252 | } else | |
70331571 VY |
3253 | return -EINVAL; |
3254 | ||
219b99a9 NH |
3255 | sp = sctp_sk(sk); |
3256 | ||
3257 | if (assoc_id != 0) { | |
3258 | asoc = sctp_id2assoc(sk, assoc_id); | |
3259 | if (!asoc) | |
3260 | return -EINVAL; | |
3261 | asoc->max_burst = val; | |
3262 | } else | |
3263 | sp->max_burst = val; | |
70331571 VY |
3264 | |
3265 | return 0; | |
3266 | } | |
3267 | ||
65b07e5d VY |
3268 | /* |
3269 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3270 | * | |
3271 | * This set option adds a chunk type that the user is requesting to be | |
3272 | * received only in an authenticated way. Changes to the list of chunks | |
3273 | * will only effect future associations on the socket. | |
3274 | */ | |
3275 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3276 | char __user *optval, |
3277 | unsigned int optlen) | |
65b07e5d | 3278 | { |
e1fc3b14 | 3279 | struct net *net = sock_net(sk); |
65b07e5d VY |
3280 | struct sctp_authchunk val; |
3281 | ||
e1fc3b14 | 3282 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3283 | return -EACCES; |
3284 | ||
65b07e5d VY |
3285 | if (optlen != sizeof(struct sctp_authchunk)) |
3286 | return -EINVAL; | |
3287 | if (copy_from_user(&val, optval, optlen)) | |
3288 | return -EFAULT; | |
3289 | ||
3290 | switch (val.sauth_chunk) { | |
7fd71b1e JP |
3291 | case SCTP_CID_INIT: |
3292 | case SCTP_CID_INIT_ACK: | |
3293 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3294 | case SCTP_CID_AUTH: | |
3295 | return -EINVAL; | |
65b07e5d VY |
3296 | } |
3297 | ||
3298 | /* add this chunk id to the endpoint */ | |
3299 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3300 | } | |
3301 | ||
3302 | /* | |
3303 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3304 | * | |
3305 | * This option gets or sets the list of HMAC algorithms that the local | |
3306 | * endpoint requires the peer to use. | |
3307 | */ | |
3308 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3309 | char __user *optval, |
3310 | unsigned int optlen) | |
65b07e5d | 3311 | { |
e1fc3b14 | 3312 | struct net *net = sock_net(sk); |
65b07e5d | 3313 | struct sctp_hmacalgo *hmacs; |
d9724055 | 3314 | u32 idents; |
65b07e5d VY |
3315 | int err; |
3316 | ||
e1fc3b14 | 3317 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3318 | return -EACCES; |
3319 | ||
65b07e5d VY |
3320 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3321 | return -EINVAL; | |
3322 | ||
934253a7 SW |
3323 | hmacs= memdup_user(optval, optlen); |
3324 | if (IS_ERR(hmacs)) | |
3325 | return PTR_ERR(hmacs); | |
65b07e5d | 3326 | |
d9724055 VY |
3327 | idents = hmacs->shmac_num_idents; |
3328 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3329 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3330 | err = -EINVAL; |
3331 | goto out; | |
3332 | } | |
3333 | ||
3334 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3335 | out: | |
3336 | kfree(hmacs); | |
3337 | return err; | |
3338 | } | |
3339 | ||
3340 | /* | |
3341 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3342 | * | |
3343 | * This option will set a shared secret key which is used to build an | |
3344 | * association shared key. | |
3345 | */ | |
3346 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3347 | char __user *optval, | |
b7058842 | 3348 | unsigned int optlen) |
65b07e5d | 3349 | { |
e1fc3b14 | 3350 | struct net *net = sock_net(sk); |
65b07e5d VY |
3351 | struct sctp_authkey *authkey; |
3352 | struct sctp_association *asoc; | |
3353 | int ret; | |
3354 | ||
e1fc3b14 | 3355 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3356 | return -EACCES; |
3357 | ||
65b07e5d VY |
3358 | if (optlen <= sizeof(struct sctp_authkey)) |
3359 | return -EINVAL; | |
3360 | ||
934253a7 SW |
3361 | authkey= memdup_user(optval, optlen); |
3362 | if (IS_ERR(authkey)) | |
3363 | return PTR_ERR(authkey); | |
65b07e5d | 3364 | |
328fc47e | 3365 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3366 | ret = -EINVAL; |
3367 | goto out; | |
3368 | } | |
3369 | ||
65b07e5d VY |
3370 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3371 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3372 | ret = -EINVAL; | |
3373 | goto out; | |
3374 | } | |
3375 | ||
3376 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3377 | out: | |
6ba542a2 | 3378 | kzfree(authkey); |
65b07e5d VY |
3379 | return ret; |
3380 | } | |
3381 | ||
3382 | /* | |
3383 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3384 | * | |
3385 | * This option will get or set the active shared key to be used to build | |
3386 | * the association shared key. | |
3387 | */ | |
3388 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3389 | char __user *optval, |
3390 | unsigned int optlen) | |
65b07e5d | 3391 | { |
e1fc3b14 | 3392 | struct net *net = sock_net(sk); |
65b07e5d VY |
3393 | struct sctp_authkeyid val; |
3394 | struct sctp_association *asoc; | |
3395 | ||
e1fc3b14 | 3396 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3397 | return -EACCES; |
3398 | ||
65b07e5d VY |
3399 | if (optlen != sizeof(struct sctp_authkeyid)) |
3400 | return -EINVAL; | |
3401 | if (copy_from_user(&val, optval, optlen)) | |
3402 | return -EFAULT; | |
3403 | ||
3404 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3405 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3406 | return -EINVAL; | |
3407 | ||
3408 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3409 | val.scact_keynumber); | |
3410 | } | |
3411 | ||
3412 | /* | |
3413 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3414 | * | |
3415 | * This set option will delete a shared secret key from use. | |
3416 | */ | |
3417 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3418 | char __user *optval, |
3419 | unsigned int optlen) | |
65b07e5d | 3420 | { |
e1fc3b14 | 3421 | struct net *net = sock_net(sk); |
65b07e5d VY |
3422 | struct sctp_authkeyid val; |
3423 | struct sctp_association *asoc; | |
3424 | ||
e1fc3b14 | 3425 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3426 | return -EACCES; |
3427 | ||
65b07e5d VY |
3428 | if (optlen != sizeof(struct sctp_authkeyid)) |
3429 | return -EINVAL; | |
3430 | if (copy_from_user(&val, optval, optlen)) | |
3431 | return -EFAULT; | |
3432 | ||
3433 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3434 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3435 | return -EINVAL; | |
3436 | ||
3437 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3438 | val.scact_keynumber); | |
3439 | ||
3440 | } | |
3441 | ||
7dc04d71 MH |
3442 | /* |
3443 | * 8.1.23 SCTP_AUTO_ASCONF | |
3444 | * | |
3445 | * This option will enable or disable the use of the automatic generation of | |
3446 | * ASCONF chunks to add and delete addresses to an existing association. Note | |
3447 | * that this option has two caveats namely: a) it only affects sockets that | |
3448 | * are bound to all addresses available to the SCTP stack, and b) the system | |
3449 | * administrator may have an overriding control that turns the ASCONF feature | |
3450 | * off no matter what setting the socket option may have. | |
3451 | * This option expects an integer boolean flag, where a non-zero value turns on | |
3452 | * the option, and a zero value turns off the option. | |
3453 | * Note. In this implementation, socket operation overrides default parameter | |
3454 | * being set by sysctl as well as FreeBSD implementation | |
3455 | */ | |
3456 | static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval, | |
3457 | unsigned int optlen) | |
3458 | { | |
3459 | int val; | |
3460 | struct sctp_sock *sp = sctp_sk(sk); | |
3461 | ||
3462 | if (optlen < sizeof(int)) | |
3463 | return -EINVAL; | |
3464 | if (get_user(val, (int __user *)optval)) | |
3465 | return -EFAULT; | |
3466 | if (!sctp_is_ep_boundall(sk) && val) | |
3467 | return -EINVAL; | |
3468 | if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf)) | |
3469 | return 0; | |
3470 | ||
3471 | if (val == 0 && sp->do_auto_asconf) { | |
3472 | list_del(&sp->auto_asconf_list); | |
3473 | sp->do_auto_asconf = 0; | |
3474 | } else if (val && !sp->do_auto_asconf) { | |
3475 | list_add_tail(&sp->auto_asconf_list, | |
4db67e80 | 3476 | &sock_net(sk)->sctp.auto_asconf_splist); |
7dc04d71 MH |
3477 | sp->do_auto_asconf = 1; |
3478 | } | |
3479 | return 0; | |
3480 | } | |
3481 | ||
65b07e5d | 3482 | |
5aa93bcf NH |
3483 | /* |
3484 | * SCTP_PEER_ADDR_THLDS | |
3485 | * | |
3486 | * This option allows us to alter the partially failed threshold for one or all | |
3487 | * transports in an association. See Section 6.1 of: | |
3488 | * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt | |
3489 | */ | |
3490 | static int sctp_setsockopt_paddr_thresholds(struct sock *sk, | |
3491 | char __user *optval, | |
3492 | unsigned int optlen) | |
3493 | { | |
3494 | struct sctp_paddrthlds val; | |
3495 | struct sctp_transport *trans; | |
3496 | struct sctp_association *asoc; | |
3497 | ||
3498 | if (optlen < sizeof(struct sctp_paddrthlds)) | |
3499 | return -EINVAL; | |
3500 | if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, | |
3501 | sizeof(struct sctp_paddrthlds))) | |
3502 | return -EFAULT; | |
3503 | ||
3504 | ||
3505 | if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) { | |
3506 | asoc = sctp_id2assoc(sk, val.spt_assoc_id); | |
3507 | if (!asoc) | |
3508 | return -ENOENT; | |
3509 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
3510 | transports) { | |
3511 | if (val.spt_pathmaxrxt) | |
3512 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3513 | trans->pf_retrans = val.spt_pathpfthld; | |
3514 | } | |
3515 | ||
3516 | if (val.spt_pathmaxrxt) | |
3517 | asoc->pathmaxrxt = val.spt_pathmaxrxt; | |
3518 | asoc->pf_retrans = val.spt_pathpfthld; | |
3519 | } else { | |
3520 | trans = sctp_addr_id2transport(sk, &val.spt_address, | |
3521 | val.spt_assoc_id); | |
3522 | if (!trans) | |
3523 | return -ENOENT; | |
3524 | ||
3525 | if (val.spt_pathmaxrxt) | |
3526 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3527 | trans->pf_retrans = val.spt_pathpfthld; | |
3528 | } | |
3529 | ||
3530 | return 0; | |
3531 | } | |
3532 | ||
1da177e4 LT |
3533 | /* API 6.2 setsockopt(), getsockopt() |
3534 | * | |
3535 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3536 | * socket options. Socket options are used to change the default | |
3537 | * behavior of sockets calls. They are described in Section 7. | |
3538 | * | |
3539 | * The syntax is: | |
3540 | * | |
3541 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3542 | * int __user *optlen); | |
3543 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3544 | * int optlen); | |
3545 | * | |
3546 | * sd - the socket descript. | |
3547 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3548 | * optname - the option name. | |
3549 | * optval - the buffer to store the value of the option. | |
3550 | * optlen - the size of the buffer. | |
3551 | */ | |
dda91928 DB |
3552 | static int sctp_setsockopt(struct sock *sk, int level, int optname, |
3553 | char __user *optval, unsigned int optlen) | |
1da177e4 LT |
3554 | { |
3555 | int retval = 0; | |
3556 | ||
bb33381d | 3557 | pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname); |
1da177e4 LT |
3558 | |
3559 | /* I can hardly begin to describe how wrong this is. This is | |
3560 | * so broken as to be worse than useless. The API draft | |
3561 | * REALLY is NOT helpful here... I am not convinced that the | |
3562 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3563 | * are at all well-founded. | |
3564 | */ | |
3565 | if (level != SOL_SCTP) { | |
3566 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3567 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3568 | goto out_nounlock; | |
3569 | } | |
3570 | ||
3571 | sctp_lock_sock(sk); | |
3572 | ||
3573 | switch (optname) { | |
3574 | case SCTP_SOCKOPT_BINDX_ADD: | |
3575 | /* 'optlen' is the size of the addresses buffer. */ | |
3576 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3577 | optlen, SCTP_BINDX_ADD_ADDR); | |
3578 | break; | |
3579 | ||
3580 | case SCTP_SOCKOPT_BINDX_REM: | |
3581 | /* 'optlen' is the size of the addresses buffer. */ | |
3582 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3583 | optlen, SCTP_BINDX_REM_ADDR); | |
3584 | break; | |
3585 | ||
88a0a948 VY |
3586 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3587 | /* 'optlen' is the size of the addresses buffer. */ | |
3588 | retval = sctp_setsockopt_connectx_old(sk, | |
3589 | (struct sockaddr __user *)optval, | |
3590 | optlen); | |
3591 | break; | |
3592 | ||
3f7a87d2 FF |
3593 | case SCTP_SOCKOPT_CONNECTX: |
3594 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3595 | retval = sctp_setsockopt_connectx(sk, |
3596 | (struct sockaddr __user *)optval, | |
3597 | optlen); | |
3f7a87d2 FF |
3598 | break; |
3599 | ||
1da177e4 LT |
3600 | case SCTP_DISABLE_FRAGMENTS: |
3601 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3602 | break; | |
3603 | ||
3604 | case SCTP_EVENTS: | |
3605 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3606 | break; | |
3607 | ||
3608 | case SCTP_AUTOCLOSE: | |
3609 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3610 | break; | |
3611 | ||
3612 | case SCTP_PEER_ADDR_PARAMS: | |
3613 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3614 | break; | |
3615 | ||
4580ccc0 | 3616 | case SCTP_DELAYED_SACK: |
d364d927 | 3617 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3618 | break; |
d49d91d7 VY |
3619 | case SCTP_PARTIAL_DELIVERY_POINT: |
3620 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3621 | break; | |
7708610b | 3622 | |
1da177e4 LT |
3623 | case SCTP_INITMSG: |
3624 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3625 | break; | |
3626 | case SCTP_DEFAULT_SEND_PARAM: | |
3627 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3628 | optlen); | |
3629 | break; | |
3630 | case SCTP_PRIMARY_ADDR: | |
3631 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3632 | break; | |
3633 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3634 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3635 | break; | |
3636 | case SCTP_NODELAY: | |
3637 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3638 | break; | |
3639 | case SCTP_RTOINFO: | |
3640 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3641 | break; | |
3642 | case SCTP_ASSOCINFO: | |
3643 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3644 | break; | |
3645 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3646 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3647 | break; | |
3648 | case SCTP_MAXSEG: | |
3649 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3650 | break; | |
0f3fffd8 ISJ |
3651 | case SCTP_ADAPTATION_LAYER: |
3652 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3653 | break; |
6ab792f5 ISJ |
3654 | case SCTP_CONTEXT: |
3655 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3656 | break; | |
b6e1331f VY |
3657 | case SCTP_FRAGMENT_INTERLEAVE: |
3658 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3659 | break; | |
70331571 VY |
3660 | case SCTP_MAX_BURST: |
3661 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3662 | break; | |
65b07e5d VY |
3663 | case SCTP_AUTH_CHUNK: |
3664 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3665 | break; | |
3666 | case SCTP_HMAC_IDENT: | |
3667 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3668 | break; | |
3669 | case SCTP_AUTH_KEY: | |
3670 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3671 | break; | |
3672 | case SCTP_AUTH_ACTIVE_KEY: | |
3673 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3674 | break; | |
3675 | case SCTP_AUTH_DELETE_KEY: | |
3676 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3677 | break; | |
7dc04d71 MH |
3678 | case SCTP_AUTO_ASCONF: |
3679 | retval = sctp_setsockopt_auto_asconf(sk, optval, optlen); | |
3680 | break; | |
5aa93bcf NH |
3681 | case SCTP_PEER_ADDR_THLDS: |
3682 | retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen); | |
3683 | break; | |
1da177e4 LT |
3684 | default: |
3685 | retval = -ENOPROTOOPT; | |
3686 | break; | |
3ff50b79 | 3687 | } |
1da177e4 LT |
3688 | |
3689 | sctp_release_sock(sk); | |
3690 | ||
3691 | out_nounlock: | |
3692 | return retval; | |
3693 | } | |
3694 | ||
3695 | /* API 3.1.6 connect() - UDP Style Syntax | |
3696 | * | |
3697 | * An application may use the connect() call in the UDP model to initiate an | |
3698 | * association without sending data. | |
3699 | * | |
3700 | * The syntax is: | |
3701 | * | |
3702 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3703 | * | |
3704 | * sd: the socket descriptor to have a new association added to. | |
3705 | * | |
3706 | * nam: the address structure (either struct sockaddr_in or struct | |
3707 | * sockaddr_in6 defined in RFC2553 [7]). | |
3708 | * | |
3709 | * len: the size of the address. | |
3710 | */ | |
dda91928 DB |
3711 | static int sctp_connect(struct sock *sk, struct sockaddr *addr, |
3712 | int addr_len) | |
1da177e4 | 3713 | { |
1da177e4 | 3714 | int err = 0; |
3f7a87d2 | 3715 | struct sctp_af *af; |
1da177e4 LT |
3716 | |
3717 | sctp_lock_sock(sk); | |
3718 | ||
bb33381d DB |
3719 | pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk, |
3720 | addr, addr_len); | |
1da177e4 | 3721 | |
3f7a87d2 FF |
3722 | /* Validate addr_len before calling common connect/connectx routine. */ |
3723 | af = sctp_get_af_specific(addr->sa_family); | |
3724 | if (!af || addr_len < af->sockaddr_len) { | |
3725 | err = -EINVAL; | |
3726 | } else { | |
3727 | /* Pass correct addr len to common routine (so it knows there | |
3728 | * is only one address being passed. | |
3729 | */ | |
88a0a948 | 3730 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3731 | } |
3732 | ||
1da177e4 | 3733 | sctp_release_sock(sk); |
1da177e4 LT |
3734 | return err; |
3735 | } | |
3736 | ||
3737 | /* FIXME: Write comments. */ | |
dda91928 | 3738 | static int sctp_disconnect(struct sock *sk, int flags) |
1da177e4 LT |
3739 | { |
3740 | return -EOPNOTSUPP; /* STUB */ | |
3741 | } | |
3742 | ||
3743 | /* 4.1.4 accept() - TCP Style Syntax | |
3744 | * | |
3745 | * Applications use accept() call to remove an established SCTP | |
3746 | * association from the accept queue of the endpoint. A new socket | |
3747 | * descriptor will be returned from accept() to represent the newly | |
3748 | * formed association. | |
3749 | */ | |
dda91928 | 3750 | static struct sock *sctp_accept(struct sock *sk, int flags, int *err) |
1da177e4 LT |
3751 | { |
3752 | struct sctp_sock *sp; | |
3753 | struct sctp_endpoint *ep; | |
3754 | struct sock *newsk = NULL; | |
3755 | struct sctp_association *asoc; | |
3756 | long timeo; | |
3757 | int error = 0; | |
3758 | ||
3759 | sctp_lock_sock(sk); | |
3760 | ||
3761 | sp = sctp_sk(sk); | |
3762 | ep = sp->ep; | |
3763 | ||
3764 | if (!sctp_style(sk, TCP)) { | |
3765 | error = -EOPNOTSUPP; | |
3766 | goto out; | |
3767 | } | |
3768 | ||
3769 | if (!sctp_sstate(sk, LISTENING)) { | |
3770 | error = -EINVAL; | |
3771 | goto out; | |
3772 | } | |
3773 | ||
8abfedd8 | 3774 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3775 | |
3776 | error = sctp_wait_for_accept(sk, timeo); | |
3777 | if (error) | |
3778 | goto out; | |
3779 | ||
3780 | /* We treat the list of associations on the endpoint as the accept | |
3781 | * queue and pick the first association on the list. | |
3782 | */ | |
3783 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3784 | ||
3785 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3786 | if (!newsk) { | |
3787 | error = -ENOMEM; | |
3788 | goto out; | |
3789 | } | |
3790 | ||
3791 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3792 | * asoc to the newsk. | |
3793 | */ | |
3794 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3795 | ||
3796 | out: | |
3797 | sctp_release_sock(sk); | |
d808ad9a | 3798 | *err = error; |
1da177e4 LT |
3799 | return newsk; |
3800 | } | |
3801 | ||
3802 | /* The SCTP ioctl handler. */ | |
dda91928 | 3803 | static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1da177e4 | 3804 | { |
65040c33 DEFP |
3805 | int rc = -ENOTCONN; |
3806 | ||
3807 | sctp_lock_sock(sk); | |
3808 | ||
3809 | /* | |
3810 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3811 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3812 | */ | |
3813 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3814 | goto out; | |
3815 | ||
3816 | switch (cmd) { | |
3817 | case SIOCINQ: { | |
3818 | struct sk_buff *skb; | |
3819 | unsigned int amount = 0; | |
3820 | ||
3821 | skb = skb_peek(&sk->sk_receive_queue); | |
3822 | if (skb != NULL) { | |
3823 | /* | |
3824 | * We will only return the amount of this packet since | |
3825 | * that is all that will be read. | |
3826 | */ | |
3827 | amount = skb->len; | |
3828 | } | |
3829 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3830 | break; |
9a7241c2 | 3831 | } |
65040c33 DEFP |
3832 | default: |
3833 | rc = -ENOIOCTLCMD; | |
3834 | break; | |
3835 | } | |
3836 | out: | |
3837 | sctp_release_sock(sk); | |
3838 | return rc; | |
1da177e4 LT |
3839 | } |
3840 | ||
3841 | /* This is the function which gets called during socket creation to | |
3842 | * initialized the SCTP-specific portion of the sock. | |
3843 | * The sock structure should already be zero-filled memory. | |
3844 | */ | |
dda91928 | 3845 | static int sctp_init_sock(struct sock *sk) |
1da177e4 | 3846 | { |
e1fc3b14 | 3847 | struct net *net = sock_net(sk); |
1da177e4 LT |
3848 | struct sctp_sock *sp; |
3849 | ||
bb33381d | 3850 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
3851 | |
3852 | sp = sctp_sk(sk); | |
3853 | ||
3854 | /* Initialize the SCTP per socket area. */ | |
3855 | switch (sk->sk_type) { | |
3856 | case SOCK_SEQPACKET: | |
3857 | sp->type = SCTP_SOCKET_UDP; | |
3858 | break; | |
3859 | case SOCK_STREAM: | |
3860 | sp->type = SCTP_SOCKET_TCP; | |
3861 | break; | |
3862 | default: | |
3863 | return -ESOCKTNOSUPPORT; | |
3864 | } | |
3865 | ||
3866 | /* Initialize default send parameters. These parameters can be | |
3867 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3868 | */ | |
3869 | sp->default_stream = 0; | |
3870 | sp->default_ppid = 0; | |
3871 | sp->default_flags = 0; | |
3872 | sp->default_context = 0; | |
3873 | sp->default_timetolive = 0; | |
3874 | ||
6ab792f5 | 3875 | sp->default_rcv_context = 0; |
e1fc3b14 | 3876 | sp->max_burst = net->sctp.max_burst; |
6ab792f5 | 3877 | |
3c68198e NH |
3878 | sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg; |
3879 | ||
1da177e4 LT |
3880 | /* Initialize default setup parameters. These parameters |
3881 | * can be modified with the SCTP_INITMSG socket option or | |
3882 | * overridden by the SCTP_INIT CMSG. | |
3883 | */ | |
3884 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3885 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
e1fc3b14 EB |
3886 | sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init; |
3887 | sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max; | |
1da177e4 LT |
3888 | |
3889 | /* Initialize default RTO related parameters. These parameters can | |
3890 | * be modified for with the SCTP_RTOINFO socket option. | |
3891 | */ | |
e1fc3b14 EB |
3892 | sp->rtoinfo.srto_initial = net->sctp.rto_initial; |
3893 | sp->rtoinfo.srto_max = net->sctp.rto_max; | |
3894 | sp->rtoinfo.srto_min = net->sctp.rto_min; | |
1da177e4 LT |
3895 | |
3896 | /* Initialize default association related parameters. These parameters | |
3897 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3898 | */ | |
e1fc3b14 | 3899 | sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association; |
1da177e4 LT |
3900 | sp->assocparams.sasoc_number_peer_destinations = 0; |
3901 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3902 | sp->assocparams.sasoc_local_rwnd = 0; | |
e1fc3b14 | 3903 | sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life; |
1da177e4 LT |
3904 | |
3905 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 3906 | * options are off. |
1da177e4 LT |
3907 | */ |
3908 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3909 | ||
3910 | /* Default Peer Address Parameters. These defaults can | |
3911 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3912 | */ | |
e1fc3b14 EB |
3913 | sp->hbinterval = net->sctp.hb_interval; |
3914 | sp->pathmaxrxt = net->sctp.max_retrans_path; | |
52ccb8e9 | 3915 | sp->pathmtu = 0; // allow default discovery |
e1fc3b14 | 3916 | sp->sackdelay = net->sctp.sack_timeout; |
7bfe8bdb | 3917 | sp->sackfreq = 2; |
52ccb8e9 | 3918 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
3919 | SPP_PMTUD_ENABLE | |
3920 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
3921 | |
3922 | /* If enabled no SCTP message fragmentation will be performed. | |
3923 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3924 | */ | |
3925 | sp->disable_fragments = 0; | |
3926 | ||
208edef6 SS |
3927 | /* Enable Nagle algorithm by default. */ |
3928 | sp->nodelay = 0; | |
1da177e4 LT |
3929 | |
3930 | /* Enable by default. */ | |
3931 | sp->v4mapped = 1; | |
3932 | ||
3933 | /* Auto-close idle associations after the configured | |
3934 | * number of seconds. A value of 0 disables this | |
3935 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3936 | * for UDP-style sockets only. | |
3937 | */ | |
3938 | sp->autoclose = 0; | |
3939 | ||
3940 | /* User specified fragmentation limit. */ | |
3941 | sp->user_frag = 0; | |
3942 | ||
0f3fffd8 | 3943 | sp->adaptation_ind = 0; |
1da177e4 LT |
3944 | |
3945 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3946 | ||
3947 | /* Control variables for partial data delivery. */ | |
b6e1331f | 3948 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 3949 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 3950 | sp->frag_interleave = 0; |
1da177e4 LT |
3951 | |
3952 | /* Create a per socket endpoint structure. Even if we | |
3953 | * change the data structure relationships, this may still | |
3954 | * be useful for storing pre-connect address information. | |
3955 | */ | |
c164b838 DB |
3956 | sp->ep = sctp_endpoint_new(sk, GFP_KERNEL); |
3957 | if (!sp->ep) | |
1da177e4 LT |
3958 | return -ENOMEM; |
3959 | ||
1da177e4 LT |
3960 | sp->hmac = NULL; |
3961 | ||
0a2fbac1 DB |
3962 | sk->sk_destruct = sctp_destruct_sock; |
3963 | ||
1da177e4 | 3964 | SCTP_DBG_OBJCNT_INC(sock); |
6f756a8c DM |
3965 | |
3966 | local_bh_disable(); | |
81419d86 | 3967 | percpu_counter_inc(&sctp_sockets_allocated); |
e1fc3b14 EB |
3968 | sock_prot_inuse_add(net, sk->sk_prot, 1); |
3969 | if (net->sctp.default_auto_asconf) { | |
9f7d653b | 3970 | list_add_tail(&sp->auto_asconf_list, |
e1fc3b14 | 3971 | &net->sctp.auto_asconf_splist); |
9f7d653b MH |
3972 | sp->do_auto_asconf = 1; |
3973 | } else | |
3974 | sp->do_auto_asconf = 0; | |
6f756a8c DM |
3975 | local_bh_enable(); |
3976 | ||
1da177e4 LT |
3977 | return 0; |
3978 | } | |
3979 | ||
3980 | /* Cleanup any SCTP per socket resources. */ | |
dda91928 | 3981 | static void sctp_destroy_sock(struct sock *sk) |
1da177e4 | 3982 | { |
9f7d653b | 3983 | struct sctp_sock *sp; |
1da177e4 | 3984 | |
bb33381d | 3985 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
3986 | |
3987 | /* Release our hold on the endpoint. */ | |
9f7d653b | 3988 | sp = sctp_sk(sk); |
1abd165e DB |
3989 | /* This could happen during socket init, thus we bail out |
3990 | * early, since the rest of the below is not setup either. | |
3991 | */ | |
3992 | if (sp->ep == NULL) | |
3993 | return; | |
3994 | ||
9f7d653b MH |
3995 | if (sp->do_auto_asconf) { |
3996 | sp->do_auto_asconf = 0; | |
3997 | list_del(&sp->auto_asconf_list); | |
3998 | } | |
3999 | sctp_endpoint_free(sp->ep); | |
5bc0b3bf | 4000 | local_bh_disable(); |
81419d86 | 4001 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 4002 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 4003 | local_bh_enable(); |
1da177e4 LT |
4004 | } |
4005 | ||
0a2fbac1 DB |
4006 | /* Triggered when there are no references on the socket anymore */ |
4007 | static void sctp_destruct_sock(struct sock *sk) | |
4008 | { | |
4009 | struct sctp_sock *sp = sctp_sk(sk); | |
4010 | ||
4011 | /* Free up the HMAC transform. */ | |
4012 | crypto_free_hash(sp->hmac); | |
4013 | ||
4014 | inet_sock_destruct(sk); | |
4015 | } | |
4016 | ||
1da177e4 LT |
4017 | /* API 4.1.7 shutdown() - TCP Style Syntax |
4018 | * int shutdown(int socket, int how); | |
4019 | * | |
4020 | * sd - the socket descriptor of the association to be closed. | |
4021 | * how - Specifies the type of shutdown. The values are | |
4022 | * as follows: | |
4023 | * SHUT_RD | |
4024 | * Disables further receive operations. No SCTP | |
4025 | * protocol action is taken. | |
4026 | * SHUT_WR | |
4027 | * Disables further send operations, and initiates | |
4028 | * the SCTP shutdown sequence. | |
4029 | * SHUT_RDWR | |
4030 | * Disables further send and receive operations | |
4031 | * and initiates the SCTP shutdown sequence. | |
4032 | */ | |
dda91928 | 4033 | static void sctp_shutdown(struct sock *sk, int how) |
1da177e4 | 4034 | { |
55e26eb9 | 4035 | struct net *net = sock_net(sk); |
1da177e4 LT |
4036 | struct sctp_endpoint *ep; |
4037 | struct sctp_association *asoc; | |
4038 | ||
4039 | if (!sctp_style(sk, TCP)) | |
4040 | return; | |
4041 | ||
4042 | if (how & SEND_SHUTDOWN) { | |
4043 | ep = sctp_sk(sk)->ep; | |
4044 | if (!list_empty(&ep->asocs)) { | |
4045 | asoc = list_entry(ep->asocs.next, | |
4046 | struct sctp_association, asocs); | |
55e26eb9 | 4047 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
4048 | } |
4049 | } | |
4050 | } | |
4051 | ||
4052 | /* 7.2.1 Association Status (SCTP_STATUS) | |
4053 | ||
4054 | * Applications can retrieve current status information about an | |
4055 | * association, including association state, peer receiver window size, | |
4056 | * number of unacked data chunks, and number of data chunks pending | |
4057 | * receipt. This information is read-only. | |
4058 | */ | |
4059 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
4060 | char __user *optval, | |
4061 | int __user *optlen) | |
4062 | { | |
4063 | struct sctp_status status; | |
4064 | struct sctp_association *asoc = NULL; | |
4065 | struct sctp_transport *transport; | |
4066 | sctp_assoc_t associd; | |
4067 | int retval = 0; | |
4068 | ||
408f22e8 | 4069 | if (len < sizeof(status)) { |
1da177e4 LT |
4070 | retval = -EINVAL; |
4071 | goto out; | |
4072 | } | |
4073 | ||
408f22e8 NH |
4074 | len = sizeof(status); |
4075 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
4076 | retval = -EFAULT; |
4077 | goto out; | |
4078 | } | |
4079 | ||
4080 | associd = status.sstat_assoc_id; | |
4081 | asoc = sctp_id2assoc(sk, associd); | |
4082 | if (!asoc) { | |
4083 | retval = -EINVAL; | |
4084 | goto out; | |
4085 | } | |
4086 | ||
4087 | transport = asoc->peer.primary_path; | |
4088 | ||
4089 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
4090 | status.sstat_state = asoc->state; | |
4091 | status.sstat_rwnd = asoc->peer.rwnd; | |
4092 | status.sstat_unackdata = asoc->unack_data; | |
4093 | ||
4094 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
4095 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
4096 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
4097 | status.sstat_fragmentation_point = asoc->frag_point; | |
4098 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
4099 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
4100 | transport->af_specific->sockaddr_len); | |
1da177e4 LT |
4101 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
4102 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
4103 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3f7a87d2 | 4104 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
4105 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
4106 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
4107 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4108 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4109 | |
3f7a87d2 FF |
4110 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
4111 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
4112 | ||
1da177e4 LT |
4113 | if (put_user(len, optlen)) { |
4114 | retval = -EFAULT; | |
4115 | goto out; | |
4116 | } | |
4117 | ||
bb33381d DB |
4118 | pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n", |
4119 | __func__, len, status.sstat_state, status.sstat_rwnd, | |
4120 | status.sstat_assoc_id); | |
1da177e4 LT |
4121 | |
4122 | if (copy_to_user(optval, &status, len)) { | |
4123 | retval = -EFAULT; | |
4124 | goto out; | |
4125 | } | |
4126 | ||
4127 | out: | |
a02cec21 | 4128 | return retval; |
1da177e4 LT |
4129 | } |
4130 | ||
4131 | ||
4132 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
4133 | * | |
4134 | * Applications can retrieve information about a specific peer address | |
4135 | * of an association, including its reachability state, congestion | |
4136 | * window, and retransmission timer values. This information is | |
4137 | * read-only. | |
4138 | */ | |
4139 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
4140 | char __user *optval, | |
4141 | int __user *optlen) | |
4142 | { | |
4143 | struct sctp_paddrinfo pinfo; | |
4144 | struct sctp_transport *transport; | |
4145 | int retval = 0; | |
4146 | ||
408f22e8 | 4147 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
4148 | retval = -EINVAL; |
4149 | goto out; | |
4150 | } | |
4151 | ||
408f22e8 NH |
4152 | len = sizeof(pinfo); |
4153 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
4154 | retval = -EFAULT; |
4155 | goto out; | |
4156 | } | |
4157 | ||
4158 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
4159 | pinfo.spinfo_assoc_id); | |
4160 | if (!transport) | |
4161 | return -EINVAL; | |
4162 | ||
4163 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 4164 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
4165 | pinfo.spinfo_cwnd = transport->cwnd; |
4166 | pinfo.spinfo_srtt = transport->srtt; | |
4167 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4168 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4169 | |
3f7a87d2 FF |
4170 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
4171 | pinfo.spinfo_state = SCTP_ACTIVE; | |
4172 | ||
1da177e4 LT |
4173 | if (put_user(len, optlen)) { |
4174 | retval = -EFAULT; | |
4175 | goto out; | |
4176 | } | |
4177 | ||
4178 | if (copy_to_user(optval, &pinfo, len)) { | |
4179 | retval = -EFAULT; | |
4180 | goto out; | |
4181 | } | |
4182 | ||
4183 | out: | |
a02cec21 | 4184 | return retval; |
1da177e4 LT |
4185 | } |
4186 | ||
4187 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
4188 | * | |
4189 | * This option is a on/off flag. If enabled no SCTP message | |
4190 | * fragmentation will be performed. Instead if a message being sent | |
4191 | * exceeds the current PMTU size, the message will NOT be sent and | |
4192 | * instead a error will be indicated to the user. | |
4193 | */ | |
4194 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
4195 | char __user *optval, int __user *optlen) | |
4196 | { | |
4197 | int val; | |
4198 | ||
4199 | if (len < sizeof(int)) | |
4200 | return -EINVAL; | |
4201 | ||
4202 | len = sizeof(int); | |
4203 | val = (sctp_sk(sk)->disable_fragments == 1); | |
4204 | if (put_user(len, optlen)) | |
4205 | return -EFAULT; | |
4206 | if (copy_to_user(optval, &val, len)) | |
4207 | return -EFAULT; | |
4208 | return 0; | |
4209 | } | |
4210 | ||
4211 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4212 | * | |
4213 | * This socket option is used to specify various notifications and | |
4214 | * ancillary data the user wishes to receive. | |
4215 | */ | |
4216 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4217 | int __user *optlen) | |
4218 | { | |
acdd5985 | 4219 | if (len <= 0) |
1da177e4 | 4220 | return -EINVAL; |
acdd5985 TG |
4221 | if (len > sizeof(struct sctp_event_subscribe)) |
4222 | len = sizeof(struct sctp_event_subscribe); | |
408f22e8 NH |
4223 | if (put_user(len, optlen)) |
4224 | return -EFAULT; | |
1da177e4 LT |
4225 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4226 | return -EFAULT; | |
4227 | return 0; | |
4228 | } | |
4229 | ||
4230 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4231 | * | |
4232 | * This socket option is applicable to the UDP-style socket only. When | |
4233 | * set it will cause associations that are idle for more than the | |
4234 | * specified number of seconds to automatically close. An association | |
4235 | * being idle is defined an association that has NOT sent or received | |
4236 | * user data. The special value of '0' indicates that no automatic | |
4237 | * close of any associations should be performed. The option expects an | |
4238 | * integer defining the number of seconds of idle time before an | |
4239 | * association is closed. | |
4240 | */ | |
4241 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4242 | { | |
4243 | /* Applicable to UDP-style socket only */ | |
4244 | if (sctp_style(sk, TCP)) | |
4245 | return -EOPNOTSUPP; | |
408f22e8 | 4246 | if (len < sizeof(int)) |
1da177e4 | 4247 | return -EINVAL; |
408f22e8 NH |
4248 | len = sizeof(int); |
4249 | if (put_user(len, optlen)) | |
4250 | return -EFAULT; | |
4251 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4252 | return -EFAULT; |
4253 | return 0; | |
4254 | } | |
4255 | ||
4256 | /* Helper routine to branch off an association to a new socket. */ | |
0343c554 | 4257 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp) |
1da177e4 | 4258 | { |
0343c554 | 4259 | struct sctp_association *asoc = sctp_id2assoc(sk, id); |
1da177e4 | 4260 | struct socket *sock; |
d570ee49 | 4261 | struct sctp_af *af; |
1da177e4 LT |
4262 | int err = 0; |
4263 | ||
0343c554 BP |
4264 | if (!asoc) |
4265 | return -EINVAL; | |
4266 | ||
1da177e4 LT |
4267 | /* An association cannot be branched off from an already peeled-off |
4268 | * socket, nor is this supported for tcp style sockets. | |
4269 | */ | |
4270 | if (!sctp_style(sk, UDP)) | |
4271 | return -EINVAL; | |
4272 | ||
4273 | /* Create a new socket. */ | |
4274 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4275 | if (err < 0) | |
4276 | return err; | |
4277 | ||
914e1c8b | 4278 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4279 | |
4280 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4281 | * Set the daddr and initialize id to something more random | |
4282 | */ | |
d570ee49 VY |
4283 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4284 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
914e1c8b VY |
4285 | |
4286 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4287 | * asoc to the newsk. | |
4288 | */ | |
4289 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4290 | |
1da177e4 LT |
4291 | *sockp = sock; |
4292 | ||
4293 | return err; | |
4294 | } | |
0343c554 | 4295 | EXPORT_SYMBOL(sctp_do_peeloff); |
1da177e4 LT |
4296 | |
4297 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4298 | { | |
4299 | sctp_peeloff_arg_t peeloff; | |
4300 | struct socket *newsock; | |
56b31d1c | 4301 | struct file *newfile; |
1da177e4 | 4302 | int retval = 0; |
1da177e4 | 4303 | |
408f22e8 | 4304 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4305 | return -EINVAL; |
408f22e8 | 4306 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4307 | if (copy_from_user(&peeloff, optval, len)) |
4308 | return -EFAULT; | |
4309 | ||
0343c554 | 4310 | retval = sctp_do_peeloff(sk, peeloff.associd, &newsock); |
1da177e4 LT |
4311 | if (retval < 0) |
4312 | goto out; | |
4313 | ||
4314 | /* Map the socket to an unused fd that can be returned to the user. */ | |
56b31d1c | 4315 | retval = get_unused_fd(); |
1da177e4 LT |
4316 | if (retval < 0) { |
4317 | sock_release(newsock); | |
4318 | goto out; | |
4319 | } | |
4320 | ||
aab174f0 | 4321 | newfile = sock_alloc_file(newsock, 0, NULL); |
56b31d1c AV |
4322 | if (unlikely(IS_ERR(newfile))) { |
4323 | put_unused_fd(retval); | |
4324 | sock_release(newsock); | |
4325 | return PTR_ERR(newfile); | |
4326 | } | |
4327 | ||
bb33381d DB |
4328 | pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk, |
4329 | retval); | |
1da177e4 LT |
4330 | |
4331 | /* Return the fd mapped to the new socket. */ | |
56b31d1c AV |
4332 | if (put_user(len, optlen)) { |
4333 | fput(newfile); | |
4334 | put_unused_fd(retval); | |
4335 | return -EFAULT; | |
4336 | } | |
1da177e4 | 4337 | peeloff.sd = retval; |
56b31d1c AV |
4338 | if (copy_to_user(optval, &peeloff, len)) { |
4339 | fput(newfile); | |
4340 | put_unused_fd(retval); | |
408f22e8 | 4341 | return -EFAULT; |
56b31d1c AV |
4342 | } |
4343 | fd_install(retval, newfile); | |
1da177e4 LT |
4344 | out: |
4345 | return retval; | |
4346 | } | |
4347 | ||
4348 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4349 | * | |
4350 | * Applications can enable or disable heartbeats for any peer address of | |
4351 | * an association, modify an address's heartbeat interval, force a | |
4352 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4353 | * number of retransmissions sent before an address is considered | |
4354 | * unreachable. The following structure is used to access and modify an | |
4355 | * address's parameters: | |
4356 | * | |
4357 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4358 | * sctp_assoc_t spp_assoc_id; |
4359 | * struct sockaddr_storage spp_address; | |
4360 | * uint32_t spp_hbinterval; | |
4361 | * uint16_t spp_pathmaxrxt; | |
4362 | * uint32_t spp_pathmtu; | |
4363 | * uint32_t spp_sackdelay; | |
4364 | * uint32_t spp_flags; | |
4365 | * }; | |
4366 | * | |
4367 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4368 | * application, and identifies the association for | |
4369 | * this query. | |
1da177e4 LT |
4370 | * spp_address - This specifies which address is of interest. |
4371 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4372 | * in milliseconds. If a value of zero |
4373 | * is present in this field then no changes are to | |
4374 | * be made to this parameter. | |
1da177e4 LT |
4375 | * spp_pathmaxrxt - This contains the maximum number of |
4376 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4377 | * considered unreachable. If a value of zero |
4378 | * is present in this field then no changes are to | |
4379 | * be made to this parameter. | |
4380 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4381 | * specified here will be the "fixed" path mtu. | |
4382 | * Note that if the spp_address field is empty | |
4383 | * then all associations on this address will | |
4384 | * have this fixed path mtu set upon them. | |
4385 | * | |
4386 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4387 | * the number of milliseconds that sacks will be delayed | |
4388 | * for. This value will apply to all addresses of an | |
4389 | * association if the spp_address field is empty. Note | |
4390 | * also, that if delayed sack is enabled and this | |
4391 | * value is set to 0, no change is made to the last | |
4392 | * recorded delayed sack timer value. | |
4393 | * | |
4394 | * spp_flags - These flags are used to control various features | |
4395 | * on an association. The flag field may contain | |
4396 | * zero or more of the following options. | |
4397 | * | |
4398 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4399 | * specified address. Note that if the address | |
4400 | * field is empty all addresses for the association | |
4401 | * have heartbeats enabled upon them. | |
4402 | * | |
4403 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4404 | * speicifed address. Note that if the address | |
4405 | * field is empty all addresses for the association | |
4406 | * will have their heartbeats disabled. Note also | |
4407 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4408 | * mutually exclusive, only one of these two should | |
4409 | * be specified. Enabling both fields will have | |
4410 | * undetermined results. | |
4411 | * | |
4412 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4413 | * to be made immediately. | |
4414 | * | |
4415 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4416 | * discovery upon the specified address. Note that | |
4417 | * if the address feild is empty then all addresses | |
4418 | * on the association are effected. | |
4419 | * | |
4420 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4421 | * discovery upon the specified address. Note that | |
4422 | * if the address feild is empty then all addresses | |
4423 | * on the association are effected. Not also that | |
4424 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4425 | * exclusive. Enabling both will have undetermined | |
4426 | * results. | |
4427 | * | |
4428 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4429 | * on delayed sack. The time specified in spp_sackdelay | |
4430 | * is used to specify the sack delay for this address. Note | |
4431 | * that if spp_address is empty then all addresses will | |
4432 | * enable delayed sack and take on the sack delay | |
4433 | * value specified in spp_sackdelay. | |
4434 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4435 | * off delayed sack. If the spp_address field is blank then | |
4436 | * delayed sack is disabled for the entire association. Note | |
4437 | * also that this field is mutually exclusive to | |
4438 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4439 | * results. | |
1da177e4 LT |
4440 | */ |
4441 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4442 | char __user *optval, int __user *optlen) |
1da177e4 | 4443 | { |
52ccb8e9 FF |
4444 | struct sctp_paddrparams params; |
4445 | struct sctp_transport *trans = NULL; | |
4446 | struct sctp_association *asoc = NULL; | |
4447 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4448 | |
408f22e8 | 4449 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4450 | return -EINVAL; |
408f22e8 | 4451 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4452 | if (copy_from_user(¶ms, optval, len)) |
4453 | return -EFAULT; | |
4454 | ||
52ccb8e9 FF |
4455 | /* If an address other than INADDR_ANY is specified, and |
4456 | * no transport is found, then the request is invalid. | |
1da177e4 | 4457 | */ |
52cae8f0 | 4458 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4459 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4460 | params.spp_assoc_id); | |
4461 | if (!trans) { | |
bb33381d | 4462 | pr_debug("%s: failed no transport\n", __func__); |
52ccb8e9 FF |
4463 | return -EINVAL; |
4464 | } | |
1da177e4 LT |
4465 | } |
4466 | ||
52ccb8e9 FF |
4467 | /* Get association, if assoc_id != 0 and the socket is a one |
4468 | * to many style socket, and an association was not found, then | |
4469 | * the id was invalid. | |
4470 | */ | |
4471 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4472 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
bb33381d | 4473 | pr_debug("%s: failed no association\n", __func__); |
1da177e4 | 4474 | return -EINVAL; |
52ccb8e9 | 4475 | } |
1da177e4 | 4476 | |
52ccb8e9 FF |
4477 | if (trans) { |
4478 | /* Fetch transport values. */ | |
4479 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4480 | params.spp_pathmtu = trans->pathmtu; | |
4481 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4482 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4483 | ||
4484 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4485 | params.spp_flags = trans->param_flags; | |
4486 | } else if (asoc) { | |
4487 | /* Fetch association values. */ | |
4488 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4489 | params.spp_pathmtu = asoc->pathmtu; | |
4490 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4491 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4492 | ||
4493 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4494 | params.spp_flags = asoc->param_flags; | |
4495 | } else { | |
4496 | /* Fetch socket values. */ | |
4497 | params.spp_hbinterval = sp->hbinterval; | |
4498 | params.spp_pathmtu = sp->pathmtu; | |
4499 | params.spp_sackdelay = sp->sackdelay; | |
4500 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4501 | |
52ccb8e9 FF |
4502 | /*draft-11 doesn't say what to return in spp_flags*/ |
4503 | params.spp_flags = sp->param_flags; | |
4504 | } | |
1da177e4 | 4505 | |
1da177e4 LT |
4506 | if (copy_to_user(optval, ¶ms, len)) |
4507 | return -EFAULT; | |
4508 | ||
4509 | if (put_user(len, optlen)) | |
4510 | return -EFAULT; | |
4511 | ||
4512 | return 0; | |
4513 | } | |
4514 | ||
d364d927 WY |
4515 | /* |
4516 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4517 | * | |
4518 | * This option will effect the way delayed acks are performed. This | |
4519 | * option allows you to get or set the delayed ack time, in | |
4520 | * milliseconds. It also allows changing the delayed ack frequency. | |
4521 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4522 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4523 | * values. If the assoc_id field is non-zero, then the set or get | |
4524 | * effects the specified association for the one to many model (the | |
4525 | * assoc_id field is ignored by the one to one model). Note that if | |
4526 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4527 | * current values will remain unchanged. | |
4528 | * | |
4529 | * struct sctp_sack_info { | |
4530 | * sctp_assoc_t sack_assoc_id; | |
4531 | * uint32_t sack_delay; | |
4532 | * uint32_t sack_freq; | |
4533 | * }; | |
7708610b | 4534 | * |
d364d927 WY |
4535 | * sack_assoc_id - This parameter, indicates which association the user |
4536 | * is performing an action upon. Note that if this field's value is | |
4537 | * zero then the endpoints default value is changed (effecting future | |
4538 | * associations only). | |
7708610b | 4539 | * |
d364d927 WY |
4540 | * sack_delay - This parameter contains the number of milliseconds that |
4541 | * the user is requesting the delayed ACK timer be set to. Note that | |
4542 | * this value is defined in the standard to be between 200 and 500 | |
4543 | * milliseconds. | |
7708610b | 4544 | * |
d364d927 WY |
4545 | * sack_freq - This parameter contains the number of packets that must |
4546 | * be received before a sack is sent without waiting for the delay | |
4547 | * timer to expire. The default value for this is 2, setting this | |
4548 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4549 | */ |
d364d927 | 4550 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4551 | char __user *optval, |
4552 | int __user *optlen) | |
4553 | { | |
d364d927 | 4554 | struct sctp_sack_info params; |
7708610b FF |
4555 | struct sctp_association *asoc = NULL; |
4556 | struct sctp_sock *sp = sctp_sk(sk); | |
4557 | ||
d364d927 WY |
4558 | if (len >= sizeof(struct sctp_sack_info)) { |
4559 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4560 | |
d364d927 WY |
4561 | if (copy_from_user(¶ms, optval, len)) |
4562 | return -EFAULT; | |
4563 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
4564 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
4565 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
4566 | if (copy_from_user(¶ms, optval, len)) |
4567 | return -EFAULT; | |
4568 | } else | |
4569 | return - EINVAL; | |
7708610b | 4570 | |
d364d927 | 4571 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4572 | * to many style socket, and an association was not found, then |
4573 | * the id was invalid. | |
d808ad9a | 4574 | */ |
d364d927 WY |
4575 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4576 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4577 | return -EINVAL; |
4578 | ||
4579 | if (asoc) { | |
4580 | /* Fetch association values. */ | |
d364d927 WY |
4581 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4582 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4583 | asoc->sackdelay); |
d364d927 WY |
4584 | params.sack_freq = asoc->sackfreq; |
4585 | ||
4586 | } else { | |
4587 | params.sack_delay = 0; | |
4588 | params.sack_freq = 1; | |
4589 | } | |
7708610b FF |
4590 | } else { |
4591 | /* Fetch socket values. */ | |
d364d927 WY |
4592 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4593 | params.sack_delay = sp->sackdelay; | |
4594 | params.sack_freq = sp->sackfreq; | |
4595 | } else { | |
4596 | params.sack_delay = 0; | |
4597 | params.sack_freq = 1; | |
4598 | } | |
7708610b FF |
4599 | } |
4600 | ||
4601 | if (copy_to_user(optval, ¶ms, len)) | |
4602 | return -EFAULT; | |
4603 | ||
4604 | if (put_user(len, optlen)) | |
4605 | return -EFAULT; | |
4606 | ||
4607 | return 0; | |
4608 | } | |
4609 | ||
1da177e4 LT |
4610 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4611 | * | |
4612 | * Applications can specify protocol parameters for the default association | |
4613 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4614 | * is SCTP_INITMSG. | |
4615 | * | |
4616 | * Setting initialization parameters is effective only on an unconnected | |
4617 | * socket (for UDP-style sockets only future associations are effected | |
4618 | * by the change). With TCP-style sockets, this option is inherited by | |
4619 | * sockets derived from a listener socket. | |
4620 | */ | |
4621 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4622 | { | |
408f22e8 | 4623 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4624 | return -EINVAL; |
408f22e8 NH |
4625 | len = sizeof(struct sctp_initmsg); |
4626 | if (put_user(len, optlen)) | |
4627 | return -EFAULT; | |
1da177e4 LT |
4628 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4629 | return -EFAULT; | |
4630 | return 0; | |
4631 | } | |
4632 | ||