Commit | Line | Data |
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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2003 Intel Corp. | |
6 | * Copyright (c) 2001-2002 Nokia, Inc. | |
7 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
8 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * These functions interface with the sockets layer to implement the | |
12 | * SCTP Extensions for the Sockets API. | |
13 | * | |
14 | * Note that the descriptions from the specification are USER level | |
15 | * functions--this file is the functions which populate the struct proto | |
16 | * for SCTP which is the BOTTOM of the sockets interface. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is free software; |
1da177e4 LT |
19 | * you can redistribute it and/or modify it under the terms of |
20 | * the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2, or (at your option) | |
22 | * any later version. | |
23 | * | |
60c778b2 | 24 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
25 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
26 | * ************************ | |
27 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
28 | * See the GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with GNU CC; see the file COPYING. If not, write to | |
32 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
33 | * Boston, MA 02111-1307, USA. | |
34 | * | |
35 | * Please send any bug reports or fixes you make to the | |
36 | * email address(es): | |
91705c61 | 37 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 38 | * |
1da177e4 LT |
39 | * Written or modified by: |
40 | * La Monte H.P. Yarroll <piggy@acm.org> | |
41 | * Narasimha Budihal <narsi@refcode.org> | |
42 | * Karl Knutson <karl@athena.chicago.il.us> | |
43 | * Jon Grimm <jgrimm@us.ibm.com> | |
44 | * Xingang Guo <xingang.guo@intel.com> | |
45 | * Daisy Chang <daisyc@us.ibm.com> | |
46 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
47 | * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com> | |
48 | * Ardelle Fan <ardelle.fan@intel.com> | |
49 | * Ryan Layer <rmlayer@us.ibm.com> | |
50 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> | |
51 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
52 | */ |
53 | ||
145ce502 JP |
54 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
55 | ||
1da177e4 LT |
56 | #include <linux/types.h> |
57 | #include <linux/kernel.h> | |
58 | #include <linux/wait.h> | |
59 | #include <linux/time.h> | |
60 | #include <linux/ip.h> | |
4fc268d2 | 61 | #include <linux/capability.h> |
1da177e4 LT |
62 | #include <linux/fcntl.h> |
63 | #include <linux/poll.h> | |
64 | #include <linux/init.h> | |
65 | #include <linux/crypto.h> | |
5a0e3ad6 | 66 | #include <linux/slab.h> |
56b31d1c | 67 | #include <linux/file.h> |
1da177e4 LT |
68 | |
69 | #include <net/ip.h> | |
70 | #include <net/icmp.h> | |
71 | #include <net/route.h> | |
72 | #include <net/ipv6.h> | |
73 | #include <net/inet_common.h> | |
74 | ||
75 | #include <linux/socket.h> /* for sa_family_t */ | |
bc3b2d7f | 76 | #include <linux/export.h> |
1da177e4 LT |
77 | #include <net/sock.h> |
78 | #include <net/sctp/sctp.h> | |
79 | #include <net/sctp/sm.h> | |
80 | ||
1da177e4 LT |
81 | /* Forward declarations for internal helper functions. */ |
82 | static int sctp_writeable(struct sock *sk); | |
83 | static void sctp_wfree(struct sk_buff *skb); | |
84 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, | |
85 | size_t msg_len); | |
86 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p); | |
87 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); | |
88 | static int sctp_wait_for_accept(struct sock *sk, long timeo); | |
89 | static void sctp_wait_for_close(struct sock *sk, long timeo); | |
0a2fbac1 | 90 | static void sctp_destruct_sock(struct sock *sk); |
1da177e4 LT |
91 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
92 | union sctp_addr *addr, int len); | |
93 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); | |
94 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); | |
95 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); | |
96 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); | |
97 | static int sctp_send_asconf(struct sctp_association *asoc, | |
98 | struct sctp_chunk *chunk); | |
99 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); | |
100 | static int sctp_autobind(struct sock *sk); | |
101 | static void sctp_sock_migrate(struct sock *, struct sock *, | |
102 | struct sctp_association *, sctp_socket_type_t); | |
1da177e4 | 103 | |
4d93df0a | 104 | extern struct kmem_cache *sctp_bucket_cachep; |
8d987e5c | 105 | extern long sysctl_sctp_mem[3]; |
4d93df0a NH |
106 | extern int sysctl_sctp_rmem[3]; |
107 | extern int sysctl_sctp_wmem[3]; | |
108 | ||
b6fa1a4d | 109 | static int sctp_memory_pressure; |
8d987e5c | 110 | static atomic_long_t sctp_memory_allocated; |
1748376b | 111 | struct percpu_counter sctp_sockets_allocated; |
4d93df0a | 112 | |
5c52ba17 | 113 | static void sctp_enter_memory_pressure(struct sock *sk) |
4d93df0a NH |
114 | { |
115 | sctp_memory_pressure = 1; | |
116 | } | |
117 | ||
118 | ||
1da177e4 LT |
119 | /* Get the sndbuf space available at the time on the association. */ |
120 | static inline int sctp_wspace(struct sctp_association *asoc) | |
121 | { | |
4d93df0a | 122 | int amt; |
1da177e4 | 123 | |
4d93df0a NH |
124 | if (asoc->ep->sndbuf_policy) |
125 | amt = asoc->sndbuf_used; | |
126 | else | |
31e6d363 | 127 | amt = sk_wmem_alloc_get(asoc->base.sk); |
4d93df0a NH |
128 | |
129 | if (amt >= asoc->base.sk->sk_sndbuf) { | |
130 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
131 | amt = 0; | |
132 | else { | |
133 | amt = sk_stream_wspace(asoc->base.sk); | |
134 | if (amt < 0) | |
135 | amt = 0; | |
136 | } | |
4eb701df | 137 | } else { |
4d93df0a | 138 | amt = asoc->base.sk->sk_sndbuf - amt; |
4eb701df | 139 | } |
1da177e4 LT |
140 | return amt; |
141 | } | |
142 | ||
143 | /* Increment the used sndbuf space count of the corresponding association by | |
144 | * the size of the outgoing data chunk. | |
145 | * Also, set the skb destructor for sndbuf accounting later. | |
146 | * | |
147 | * Since it is always 1-1 between chunk and skb, and also a new skb is always | |
148 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the | |
149 | * destructor in the data chunk skb for the purpose of the sndbuf space | |
150 | * tracking. | |
151 | */ | |
152 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) | |
153 | { | |
154 | struct sctp_association *asoc = chunk->asoc; | |
155 | struct sock *sk = asoc->base.sk; | |
156 | ||
157 | /* The sndbuf space is tracked per association. */ | |
158 | sctp_association_hold(asoc); | |
159 | ||
4eb701df NH |
160 | skb_set_owner_w(chunk->skb, sk); |
161 | ||
1da177e4 LT |
162 | chunk->skb->destructor = sctp_wfree; |
163 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ | |
164 | *((struct sctp_chunk **)(chunk->skb->cb)) = chunk; | |
165 | ||
4eb701df NH |
166 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
167 | sizeof(struct sk_buff) + | |
168 | sizeof(struct sctp_chunk); | |
169 | ||
4eb701df | 170 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
3ab224be HA |
171 | sk->sk_wmem_queued += chunk->skb->truesize; |
172 | sk_mem_charge(sk, chunk->skb->truesize); | |
1da177e4 LT |
173 | } |
174 | ||
175 | /* Verify that this is a valid address. */ | |
176 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, | |
177 | int len) | |
178 | { | |
179 | struct sctp_af *af; | |
180 | ||
181 | /* Verify basic sockaddr. */ | |
182 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); | |
183 | if (!af) | |
184 | return -EINVAL; | |
185 | ||
186 | /* Is this a valid SCTP address? */ | |
5636bef7 | 187 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
1da177e4 LT |
188 | return -EINVAL; |
189 | ||
190 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) | |
191 | return -EINVAL; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /* Look up the association by its id. If this is not a UDP-style | |
197 | * socket, the ID field is always ignored. | |
198 | */ | |
199 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) | |
200 | { | |
201 | struct sctp_association *asoc = NULL; | |
202 | ||
203 | /* If this is not a UDP-style socket, assoc id should be ignored. */ | |
204 | if (!sctp_style(sk, UDP)) { | |
205 | /* Return NULL if the socket state is not ESTABLISHED. It | |
206 | * could be a TCP-style listening socket or a socket which | |
207 | * hasn't yet called connect() to establish an association. | |
208 | */ | |
209 | if (!sctp_sstate(sk, ESTABLISHED)) | |
210 | return NULL; | |
211 | ||
212 | /* Get the first and the only association from the list. */ | |
213 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) | |
214 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, | |
215 | struct sctp_association, asocs); | |
216 | return asoc; | |
217 | } | |
218 | ||
219 | /* Otherwise this is a UDP-style socket. */ | |
220 | if (!id || (id == (sctp_assoc_t)-1)) | |
221 | return NULL; | |
222 | ||
223 | spin_lock_bh(&sctp_assocs_id_lock); | |
224 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); | |
225 | spin_unlock_bh(&sctp_assocs_id_lock); | |
226 | ||
227 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) | |
228 | return NULL; | |
229 | ||
230 | return asoc; | |
231 | } | |
232 | ||
233 | /* Look up the transport from an address and an assoc id. If both address and | |
234 | * id are specified, the associations matching the address and the id should be | |
235 | * the same. | |
236 | */ | |
237 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, | |
238 | struct sockaddr_storage *addr, | |
239 | sctp_assoc_t id) | |
240 | { | |
241 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; | |
242 | struct sctp_transport *transport; | |
243 | union sctp_addr *laddr = (union sctp_addr *)addr; | |
244 | ||
1da177e4 | 245 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
cd4ff034 | 246 | laddr, |
1da177e4 | 247 | &transport); |
1da177e4 LT |
248 | |
249 | if (!addr_asoc) | |
250 | return NULL; | |
251 | ||
252 | id_asoc = sctp_id2assoc(sk, id); | |
253 | if (id_asoc && (id_asoc != addr_asoc)) | |
254 | return NULL; | |
255 | ||
256 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
257 | (union sctp_addr *)addr); | |
258 | ||
259 | return transport; | |
260 | } | |
261 | ||
262 | /* API 3.1.2 bind() - UDP Style Syntax | |
263 | * The syntax of bind() is, | |
264 | * | |
265 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); | |
266 | * | |
267 | * sd - the socket descriptor returned by socket(). | |
268 | * addr - the address structure (struct sockaddr_in or struct | |
269 | * sockaddr_in6 [RFC 2553]), | |
270 | * addr_len - the size of the address structure. | |
271 | */ | |
dda91928 | 272 | static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
1da177e4 LT |
273 | { |
274 | int retval = 0; | |
275 | ||
276 | sctp_lock_sock(sk); | |
277 | ||
bb33381d DB |
278 | pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk, |
279 | addr, addr_len); | |
1da177e4 LT |
280 | |
281 | /* Disallow binding twice. */ | |
282 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
3f7a87d2 | 283 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
1da177e4 LT |
284 | addr_len); |
285 | else | |
286 | retval = -EINVAL; | |
287 | ||
288 | sctp_release_sock(sk); | |
289 | ||
290 | return retval; | |
291 | } | |
292 | ||
293 | static long sctp_get_port_local(struct sock *, union sctp_addr *); | |
294 | ||
295 | /* Verify this is a valid sockaddr. */ | |
296 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
297 | union sctp_addr *addr, int len) | |
298 | { | |
299 | struct sctp_af *af; | |
300 | ||
301 | /* Check minimum size. */ | |
302 | if (len < sizeof (struct sockaddr)) | |
303 | return NULL; | |
304 | ||
7dab83de VY |
305 | /* V4 mapped address are really of AF_INET family */ |
306 | if (addr->sa.sa_family == AF_INET6 && | |
307 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { | |
308 | if (!opt->pf->af_supported(AF_INET, opt)) | |
309 | return NULL; | |
310 | } else { | |
311 | /* Does this PF support this AF? */ | |
312 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) | |
313 | return NULL; | |
314 | } | |
1da177e4 LT |
315 | |
316 | /* If we get this far, af is valid. */ | |
317 | af = sctp_get_af_specific(addr->sa.sa_family); | |
318 | ||
319 | if (len < af->sockaddr_len) | |
320 | return NULL; | |
321 | ||
322 | return af; | |
323 | } | |
324 | ||
325 | /* Bind a local address either to an endpoint or to an association. */ | |
dda91928 | 326 | static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) |
1da177e4 | 327 | { |
3594698a | 328 | struct net *net = sock_net(sk); |
1da177e4 LT |
329 | struct sctp_sock *sp = sctp_sk(sk); |
330 | struct sctp_endpoint *ep = sp->ep; | |
331 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
332 | struct sctp_af *af; | |
333 | unsigned short snum; | |
334 | int ret = 0; | |
335 | ||
1da177e4 LT |
336 | /* Common sockaddr verification. */ |
337 | af = sctp_sockaddr_af(sp, addr, len); | |
3f7a87d2 | 338 | if (!af) { |
bb33381d DB |
339 | pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n", |
340 | __func__, sk, addr, len); | |
1da177e4 | 341 | return -EINVAL; |
3f7a87d2 FF |
342 | } |
343 | ||
344 | snum = ntohs(addr->v4.sin_port); | |
345 | ||
bb33381d DB |
346 | pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n", |
347 | __func__, sk, &addr->sa, bp->port, snum, len); | |
1da177e4 LT |
348 | |
349 | /* PF specific bind() address verification. */ | |
350 | if (!sp->pf->bind_verify(sp, addr)) | |
351 | return -EADDRNOTAVAIL; | |
352 | ||
8b358056 VY |
353 | /* We must either be unbound, or bind to the same port. |
354 | * It's OK to allow 0 ports if we are already bound. | |
355 | * We'll just inhert an already bound port in this case | |
356 | */ | |
357 | if (bp->port) { | |
358 | if (!snum) | |
359 | snum = bp->port; | |
360 | else if (snum != bp->port) { | |
bb33381d DB |
361 | pr_debug("%s: new port %d doesn't match existing port " |
362 | "%d\n", __func__, snum, bp->port); | |
8b358056 VY |
363 | return -EINVAL; |
364 | } | |
1da177e4 LT |
365 | } |
366 | ||
3594698a EB |
367 | if (snum && snum < PROT_SOCK && |
368 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
369 | return -EACCES; |
370 | ||
4e54064e VY |
371 | /* See if the address matches any of the addresses we may have |
372 | * already bound before checking against other endpoints. | |
373 | */ | |
374 | if (sctp_bind_addr_match(bp, addr, sp)) | |
375 | return -EINVAL; | |
376 | ||
1da177e4 LT |
377 | /* Make sure we are allowed to bind here. |
378 | * The function sctp_get_port_local() does duplicate address | |
379 | * detection. | |
380 | */ | |
2772b495 | 381 | addr->v4.sin_port = htons(snum); |
1da177e4 | 382 | if ((ret = sctp_get_port_local(sk, addr))) { |
4e54064e | 383 | return -EADDRINUSE; |
1da177e4 LT |
384 | } |
385 | ||
386 | /* Refresh ephemeral port. */ | |
387 | if (!bp->port) | |
c720c7e8 | 388 | bp->port = inet_sk(sk)->inet_num; |
1da177e4 | 389 | |
559cf710 VY |
390 | /* Add the address to the bind address list. |
391 | * Use GFP_ATOMIC since BHs will be disabled. | |
392 | */ | |
f57d96b2 | 393 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
1da177e4 LT |
394 | |
395 | /* Copy back into socket for getsockname() use. */ | |
396 | if (!ret) { | |
c720c7e8 | 397 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
1da177e4 LT |
398 | af->to_sk_saddr(addr, sk); |
399 | } | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
404 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
405 | * | |
d808ad9a | 406 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
1da177e4 | 407 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
d808ad9a | 408 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
1da177e4 | 409 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
d808ad9a YH |
410 | * subsequent ASCONF. Note this restriction binds each side, so at any |
411 | * time two ASCONF may be in-transit on any given association (one sent | |
1da177e4 LT |
412 | * from each endpoint). |
413 | */ | |
414 | static int sctp_send_asconf(struct sctp_association *asoc, | |
415 | struct sctp_chunk *chunk) | |
416 | { | |
55e26eb9 | 417 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
418 | int retval = 0; |
419 | ||
420 | /* If there is an outstanding ASCONF chunk, queue it for later | |
421 | * transmission. | |
d808ad9a | 422 | */ |
1da177e4 | 423 | if (asoc->addip_last_asconf) { |
79af02c2 | 424 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
d808ad9a | 425 | goto out; |
1da177e4 LT |
426 | } |
427 | ||
428 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
429 | sctp_chunk_hold(chunk); | |
55e26eb9 | 430 | retval = sctp_primitive_ASCONF(net, asoc, chunk); |
1da177e4 LT |
431 | if (retval) |
432 | sctp_chunk_free(chunk); | |
433 | else | |
434 | asoc->addip_last_asconf = chunk; | |
435 | ||
436 | out: | |
437 | return retval; | |
438 | } | |
439 | ||
440 | /* Add a list of addresses as bind addresses to local endpoint or | |
441 | * association. | |
442 | * | |
443 | * Basically run through each address specified in the addrs/addrcnt | |
444 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
445 | * sctp_do_bind() on it. | |
446 | * | |
447 | * If any of them fails, then the operation will be reversed and the | |
448 | * ones that were added will be removed. | |
449 | * | |
450 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
451 | */ | |
04675210 | 452 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
453 | { |
454 | int cnt; | |
455 | int retval = 0; | |
456 | void *addr_buf; | |
457 | struct sockaddr *sa_addr; | |
458 | struct sctp_af *af; | |
459 | ||
bb33381d DB |
460 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk, |
461 | addrs, addrcnt); | |
1da177e4 LT |
462 | |
463 | addr_buf = addrs; | |
464 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
465 | /* The list may contain either IPv4 or IPv6 address; | |
466 | * determine the address length for walking thru the list. | |
467 | */ | |
ea110733 | 468 | sa_addr = addr_buf; |
1da177e4 LT |
469 | af = sctp_get_af_specific(sa_addr->sa_family); |
470 | if (!af) { | |
471 | retval = -EINVAL; | |
472 | goto err_bindx_add; | |
473 | } | |
474 | ||
d808ad9a | 475 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
1da177e4 LT |
476 | af->sockaddr_len); |
477 | ||
478 | addr_buf += af->sockaddr_len; | |
479 | ||
480 | err_bindx_add: | |
481 | if (retval < 0) { | |
482 | /* Failed. Cleanup the ones that have been added */ | |
483 | if (cnt > 0) | |
484 | sctp_bindx_rem(sk, addrs, cnt); | |
485 | return retval; | |
486 | } | |
487 | } | |
488 | ||
489 | return retval; | |
490 | } | |
491 | ||
492 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the | |
493 | * associations that are part of the endpoint indicating that a list of local | |
494 | * addresses are added to the endpoint. | |
495 | * | |
d808ad9a | 496 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
497 | * association, we do not send the chunk for that association. But it will not |
498 | * affect other associations. | |
499 | * | |
500 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
501 | */ | |
d808ad9a | 502 | static int sctp_send_asconf_add_ip(struct sock *sk, |
1da177e4 LT |
503 | struct sockaddr *addrs, |
504 | int addrcnt) | |
505 | { | |
e1fc3b14 | 506 | struct net *net = sock_net(sk); |
1da177e4 LT |
507 | struct sctp_sock *sp; |
508 | struct sctp_endpoint *ep; | |
509 | struct sctp_association *asoc; | |
510 | struct sctp_bind_addr *bp; | |
511 | struct sctp_chunk *chunk; | |
512 | struct sctp_sockaddr_entry *laddr; | |
513 | union sctp_addr *addr; | |
dc022a98 | 514 | union sctp_addr saveaddr; |
1da177e4 LT |
515 | void *addr_buf; |
516 | struct sctp_af *af; | |
1da177e4 LT |
517 | struct list_head *p; |
518 | int i; | |
519 | int retval = 0; | |
520 | ||
e1fc3b14 | 521 | if (!net->sctp.addip_enable) |
1da177e4 LT |
522 | return retval; |
523 | ||
524 | sp = sctp_sk(sk); | |
525 | ep = sp->ep; | |
526 | ||
bb33381d DB |
527 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
528 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 529 | |
9dbc15f0 | 530 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
531 | if (!asoc->peer.asconf_capable) |
532 | continue; | |
533 | ||
534 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) | |
535 | continue; | |
536 | ||
537 | if (!sctp_state(asoc, ESTABLISHED)) | |
538 | continue; | |
539 | ||
540 | /* Check if any address in the packed array of addresses is | |
d808ad9a YH |
541 | * in the bind address list of the association. If so, |
542 | * do not send the asconf chunk to its peer, but continue with | |
1da177e4 LT |
543 | * other associations. |
544 | */ | |
545 | addr_buf = addrs; | |
546 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 547 | addr = addr_buf; |
1da177e4 LT |
548 | af = sctp_get_af_specific(addr->v4.sin_family); |
549 | if (!af) { | |
550 | retval = -EINVAL; | |
551 | goto out; | |
552 | } | |
553 | ||
554 | if (sctp_assoc_lookup_laddr(asoc, addr)) | |
555 | break; | |
556 | ||
557 | addr_buf += af->sockaddr_len; | |
558 | } | |
559 | if (i < addrcnt) | |
560 | continue; | |
561 | ||
559cf710 VY |
562 | /* Use the first valid address in bind addr list of |
563 | * association as Address Parameter of ASCONF CHUNK. | |
1da177e4 | 564 | */ |
1da177e4 LT |
565 | bp = &asoc->base.bind_addr; |
566 | p = bp->address_list.next; | |
567 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
5ae955cf | 568 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
1da177e4 LT |
569 | addrcnt, SCTP_PARAM_ADD_IP); |
570 | if (!chunk) { | |
571 | retval = -ENOMEM; | |
572 | goto out; | |
573 | } | |
574 | ||
dc022a98 SS |
575 | /* Add the new addresses to the bind address list with |
576 | * use_as_src set to 0. | |
1da177e4 | 577 | */ |
dc022a98 SS |
578 | addr_buf = addrs; |
579 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 580 | addr = addr_buf; |
dc022a98 SS |
581 | af = sctp_get_af_specific(addr->v4.sin_family); |
582 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
f57d96b2 VY |
583 | retval = sctp_add_bind_addr(bp, &saveaddr, |
584 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
585 | addr_buf += af->sockaddr_len; |
586 | } | |
8a07eb0a MH |
587 | if (asoc->src_out_of_asoc_ok) { |
588 | struct sctp_transport *trans; | |
589 | ||
590 | list_for_each_entry(trans, | |
591 | &asoc->peer.transport_addr_list, transports) { | |
592 | /* Clear the source and route cache */ | |
593 | dst_release(trans->dst); | |
594 | trans->cwnd = min(4*asoc->pathmtu, max_t(__u32, | |
595 | 2*asoc->pathmtu, 4380)); | |
596 | trans->ssthresh = asoc->peer.i.a_rwnd; | |
597 | trans->rto = asoc->rto_initial; | |
196d6759 | 598 | sctp_max_rto(asoc, trans); |
8a07eb0a MH |
599 | trans->rtt = trans->srtt = trans->rttvar = 0; |
600 | sctp_transport_route(trans, NULL, | |
601 | sctp_sk(asoc->base.sk)); | |
602 | } | |
603 | } | |
604 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
605 | } |
606 | ||
607 | out: | |
608 | return retval; | |
609 | } | |
610 | ||
611 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
612 | * last address. | |
613 | * | |
614 | * Basically run through each address specified in the addrs/addrcnt | |
615 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
616 | * sctp_del_bind() on it. | |
617 | * | |
618 | * If any of them fails, then the operation will be reversed and the | |
619 | * ones that were removed will be added back. | |
620 | * | |
621 | * At least one address has to be left; if only one address is | |
622 | * available, the operation will return -EBUSY. | |
623 | * | |
624 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
625 | */ | |
04675210 | 626 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
627 | { |
628 | struct sctp_sock *sp = sctp_sk(sk); | |
629 | struct sctp_endpoint *ep = sp->ep; | |
630 | int cnt; | |
631 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
632 | int retval = 0; | |
1da177e4 | 633 | void *addr_buf; |
c9a08505 | 634 | union sctp_addr *sa_addr; |
1da177e4 LT |
635 | struct sctp_af *af; |
636 | ||
bb33381d DB |
637 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
638 | __func__, sk, addrs, addrcnt); | |
1da177e4 LT |
639 | |
640 | addr_buf = addrs; | |
641 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
642 | /* If the bind address list is empty or if there is only one | |
643 | * bind address, there is nothing more to be removed (we need | |
644 | * at least one address here). | |
645 | */ | |
646 | if (list_empty(&bp->address_list) || | |
647 | (sctp_list_single_entry(&bp->address_list))) { | |
648 | retval = -EBUSY; | |
649 | goto err_bindx_rem; | |
650 | } | |
651 | ||
ea110733 | 652 | sa_addr = addr_buf; |
c9a08505 | 653 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1da177e4 LT |
654 | if (!af) { |
655 | retval = -EINVAL; | |
656 | goto err_bindx_rem; | |
657 | } | |
0304ff8a PG |
658 | |
659 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
660 | retval = -EADDRNOTAVAIL; | |
661 | goto err_bindx_rem; | |
662 | } | |
663 | ||
ee9cbaca VY |
664 | if (sa_addr->v4.sin_port && |
665 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
666 | retval = -EINVAL; |
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); | |
672 | ||
1da177e4 LT |
673 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
674 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
675 | * be removed. This is something which needs to be looked into | |
676 | * when we are fixing the outstanding issues with multi-homing | |
677 | * socket routing and failover schemes. Refer to comments in | |
678 | * sctp_do_bind(). -daisy | |
679 | */ | |
0ed90fb0 | 680 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
681 | |
682 | addr_buf += af->sockaddr_len; | |
683 | err_bindx_rem: | |
684 | if (retval < 0) { | |
685 | /* Failed. Add the ones that has been removed back */ | |
686 | if (cnt > 0) | |
687 | sctp_bindx_add(sk, addrs, cnt); | |
688 | return retval; | |
689 | } | |
690 | } | |
691 | ||
692 | return retval; | |
693 | } | |
694 | ||
695 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
696 | * the associations that are part of the endpoint indicating that a list of | |
697 | * local addresses are removed from the endpoint. | |
698 | * | |
d808ad9a | 699 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
700 | * association, we do not send the chunk for that association. But it will not |
701 | * affect other associations. | |
702 | * | |
703 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
704 | */ | |
705 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
706 | struct sockaddr *addrs, | |
707 | int addrcnt) | |
708 | { | |
e1fc3b14 | 709 | struct net *net = sock_net(sk); |
1da177e4 LT |
710 | struct sctp_sock *sp; |
711 | struct sctp_endpoint *ep; | |
712 | struct sctp_association *asoc; | |
dc022a98 | 713 | struct sctp_transport *transport; |
1da177e4 LT |
714 | struct sctp_bind_addr *bp; |
715 | struct sctp_chunk *chunk; | |
716 | union sctp_addr *laddr; | |
717 | void *addr_buf; | |
718 | struct sctp_af *af; | |
dc022a98 | 719 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
720 | int i; |
721 | int retval = 0; | |
8a07eb0a | 722 | int stored = 0; |
1da177e4 | 723 | |
8a07eb0a | 724 | chunk = NULL; |
e1fc3b14 | 725 | if (!net->sctp.addip_enable) |
1da177e4 LT |
726 | return retval; |
727 | ||
728 | sp = sctp_sk(sk); | |
729 | ep = sp->ep; | |
730 | ||
bb33381d DB |
731 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
732 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 733 | |
9dbc15f0 | 734 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
735 | |
736 | if (!asoc->peer.asconf_capable) | |
737 | continue; | |
738 | ||
739 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
740 | continue; | |
741 | ||
742 | if (!sctp_state(asoc, ESTABLISHED)) | |
743 | continue; | |
744 | ||
745 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 746 | * not present in the bind address list of the association. |
1da177e4 LT |
747 | * If so, do not send the asconf chunk to its peer, but |
748 | * continue with other associations. | |
749 | */ | |
750 | addr_buf = addrs; | |
751 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 752 | laddr = addr_buf; |
1da177e4 LT |
753 | af = sctp_get_af_specific(laddr->v4.sin_family); |
754 | if (!af) { | |
755 | retval = -EINVAL; | |
756 | goto out; | |
757 | } | |
758 | ||
759 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
760 | break; | |
761 | ||
762 | addr_buf += af->sockaddr_len; | |
763 | } | |
764 | if (i < addrcnt) | |
765 | continue; | |
766 | ||
767 | /* Find one address in the association's bind address list | |
768 | * that is not in the packed array of addresses. This is to | |
769 | * make sure that we do not delete all the addresses in the | |
770 | * association. | |
771 | */ | |
1da177e4 LT |
772 | bp = &asoc->base.bind_addr; |
773 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
774 | addrcnt, sp); | |
8a07eb0a MH |
775 | if ((laddr == NULL) && (addrcnt == 1)) { |
776 | if (asoc->asconf_addr_del_pending) | |
777 | continue; | |
778 | asoc->asconf_addr_del_pending = | |
779 | kzalloc(sizeof(union sctp_addr), GFP_ATOMIC); | |
6d65e5ee MH |
780 | if (asoc->asconf_addr_del_pending == NULL) { |
781 | retval = -ENOMEM; | |
782 | goto out; | |
783 | } | |
8a07eb0a MH |
784 | asoc->asconf_addr_del_pending->sa.sa_family = |
785 | addrs->sa_family; | |
786 | asoc->asconf_addr_del_pending->v4.sin_port = | |
787 | htons(bp->port); | |
788 | if (addrs->sa_family == AF_INET) { | |
789 | struct sockaddr_in *sin; | |
790 | ||
791 | sin = (struct sockaddr_in *)addrs; | |
792 | asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr; | |
793 | } else if (addrs->sa_family == AF_INET6) { | |
794 | struct sockaddr_in6 *sin6; | |
795 | ||
796 | sin6 = (struct sockaddr_in6 *)addrs; | |
4e3fd7a0 | 797 | asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr; |
8a07eb0a | 798 | } |
bb33381d DB |
799 | |
800 | pr_debug("%s: keep the last address asoc:%p %pISc at %p\n", | |
801 | __func__, asoc, &asoc->asconf_addr_del_pending->sa, | |
802 | asoc->asconf_addr_del_pending); | |
803 | ||
8a07eb0a MH |
804 | asoc->src_out_of_asoc_ok = 1; |
805 | stored = 1; | |
806 | goto skip_mkasconf; | |
807 | } | |
1da177e4 | 808 | |
88362ad8 DB |
809 | if (laddr == NULL) |
810 | return -EINVAL; | |
811 | ||
559cf710 VY |
812 | /* We do not need RCU protection throughout this loop |
813 | * because this is done under a socket lock from the | |
814 | * setsockopt call. | |
815 | */ | |
1da177e4 LT |
816 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
817 | SCTP_PARAM_DEL_IP); | |
818 | if (!chunk) { | |
819 | retval = -ENOMEM; | |
820 | goto out; | |
821 | } | |
822 | ||
8a07eb0a | 823 | skip_mkasconf: |
dc022a98 SS |
824 | /* Reset use_as_src flag for the addresses in the bind address |
825 | * list that are to be deleted. | |
826 | */ | |
dc022a98 SS |
827 | addr_buf = addrs; |
828 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 829 | laddr = addr_buf; |
dc022a98 | 830 | af = sctp_get_af_specific(laddr->v4.sin_family); |
559cf710 | 831 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 832 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 833 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
834 | } |
835 | addr_buf += af->sockaddr_len; | |
836 | } | |
1da177e4 | 837 | |
dc022a98 SS |
838 | /* Update the route and saddr entries for all the transports |
839 | * as some of the addresses in the bind address list are | |
840 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 841 | */ |
9dbc15f0 RD |
842 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
843 | transports) { | |
dc022a98 SS |
844 | dst_release(transport->dst); |
845 | sctp_transport_route(transport, NULL, | |
846 | sctp_sk(asoc->base.sk)); | |
847 | } | |
848 | ||
8a07eb0a MH |
849 | if (stored) |
850 | /* We don't need to transmit ASCONF */ | |
851 | continue; | |
dc022a98 | 852 | retval = sctp_send_asconf(asoc, chunk); |
1da177e4 LT |
853 | } |
854 | out: | |
855 | return retval; | |
856 | } | |
857 | ||
9f7d653b MH |
858 | /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */ |
859 | int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) | |
860 | { | |
861 | struct sock *sk = sctp_opt2sk(sp); | |
862 | union sctp_addr *addr; | |
863 | struct sctp_af *af; | |
864 | ||
865 | /* It is safe to write port space in caller. */ | |
866 | addr = &addrw->a; | |
867 | addr->v4.sin_port = htons(sp->ep->base.bind_addr.port); | |
868 | af = sctp_get_af_specific(addr->sa.sa_family); | |
869 | if (!af) | |
870 | return -EINVAL; | |
871 | if (sctp_verify_addr(sk, addr, af->sockaddr_len)) | |
872 | return -EINVAL; | |
873 | ||
874 | if (addrw->state == SCTP_ADDR_NEW) | |
875 | return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1); | |
876 | else | |
877 | return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1); | |
878 | } | |
879 | ||
1da177e4 LT |
880 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
881 | * | |
882 | * API 8.1 | |
883 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
884 | * int flags); | |
885 | * | |
886 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
887 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
888 | * or IPv6 addresses. | |
889 | * | |
890 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
891 | * Section 3.1.2 for this usage. | |
892 | * | |
893 | * addrs is a pointer to an array of one or more socket addresses. Each | |
894 | * address is contained in its appropriate structure (i.e. struct | |
895 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 896 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
897 | * representation is termed a "packed array" of addresses). The caller |
898 | * specifies the number of addresses in the array with addrcnt. | |
899 | * | |
900 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
901 | * -1, and sets errno to the appropriate error code. | |
902 | * | |
903 | * For SCTP, the port given in each socket address must be the same, or | |
904 | * sctp_bindx() will fail, setting errno to EINVAL. | |
905 | * | |
906 | * The flags parameter is formed from the bitwise OR of zero or more of | |
907 | * the following currently defined flags: | |
908 | * | |
909 | * SCTP_BINDX_ADD_ADDR | |
910 | * | |
911 | * SCTP_BINDX_REM_ADDR | |
912 | * | |
913 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
914 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
915 | * addresses from the association. The two flags are mutually exclusive; | |
916 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
917 | * not remove all addresses from an association; sctp_bindx() will | |
918 | * reject such an attempt with EINVAL. | |
919 | * | |
920 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
921 | * additional addresses with an endpoint after calling bind(). Or use | |
922 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
923 | * socket is associated with so that no new association accepted will be | |
924 | * associated with those addresses. If the endpoint supports dynamic | |
925 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
926 | * endpoint to send the appropriate message to the peer to change the | |
927 | * peers address lists. | |
928 | * | |
929 | * Adding and removing addresses from a connected association is | |
930 | * optional functionality. Implementations that do not support this | |
931 | * functionality should return EOPNOTSUPP. | |
932 | * | |
933 | * Basically do nothing but copying the addresses from user to kernel | |
934 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
935 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
936 | * from userspace. | |
1da177e4 LT |
937 | * |
938 | * We don't use copy_from_user() for optimization: we first do the | |
939 | * sanity checks (buffer size -fast- and access check-healthy | |
940 | * pointer); if all of those succeed, then we can alloc the memory | |
941 | * (expensive operation) needed to copy the data to kernel. Then we do | |
942 | * the copying without checking the user space area | |
943 | * (__copy_from_user()). | |
944 | * | |
945 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
946 | * it. | |
947 | * | |
948 | * sk The sk of the socket | |
949 | * addrs The pointer to the addresses in user land | |
950 | * addrssize Size of the addrs buffer | |
951 | * op Operation to perform (add or remove, see the flags of | |
952 | * sctp_bindx) | |
953 | * | |
954 | * Returns 0 if ok, <0 errno code on error. | |
955 | */ | |
dda91928 DB |
956 | static int sctp_setsockopt_bindx(struct sock* sk, |
957 | struct sockaddr __user *addrs, | |
958 | int addrs_size, int op) | |
1da177e4 LT |
959 | { |
960 | struct sockaddr *kaddrs; | |
961 | int err; | |
962 | int addrcnt = 0; | |
963 | int walk_size = 0; | |
964 | struct sockaddr *sa_addr; | |
965 | void *addr_buf; | |
966 | struct sctp_af *af; | |
967 | ||
bb33381d DB |
968 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n", |
969 | __func__, sk, addrs, addrs_size, op); | |
1da177e4 LT |
970 | |
971 | if (unlikely(addrs_size <= 0)) | |
972 | return -EINVAL; | |
973 | ||
974 | /* Check the user passed a healthy pointer. */ | |
975 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
976 | return -EFAULT; | |
977 | ||
978 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 979 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1da177e4 LT |
980 | if (unlikely(!kaddrs)) |
981 | return -ENOMEM; | |
982 | ||
983 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
984 | kfree(kaddrs); | |
985 | return -EFAULT; | |
986 | } | |
987 | ||
d808ad9a | 988 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
989 | addr_buf = kaddrs; |
990 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
991 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
992 | kfree(kaddrs); | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
ea110733 | 996 | sa_addr = addr_buf; |
1da177e4 LT |
997 | af = sctp_get_af_specific(sa_addr->sa_family); |
998 | ||
999 | /* If the address family is not supported or if this address | |
1000 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 1001 | */ |
1da177e4 LT |
1002 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
1003 | kfree(kaddrs); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | addrcnt++; | |
1007 | addr_buf += af->sockaddr_len; | |
1008 | walk_size += af->sockaddr_len; | |
1009 | } | |
1010 | ||
1011 | /* Do the work. */ | |
1012 | switch (op) { | |
1013 | case SCTP_BINDX_ADD_ADDR: | |
1014 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
1015 | if (err) | |
1016 | goto out; | |
1017 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
1018 | break; | |
1019 | ||
1020 | case SCTP_BINDX_REM_ADDR: | |
1021 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
1022 | if (err) | |
1023 | goto out; | |
1024 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
1025 | break; | |
1026 | ||
1027 | default: | |
1028 | err = -EINVAL; | |
1029 | break; | |
3ff50b79 | 1030 | } |
1da177e4 LT |
1031 | |
1032 | out: | |
1033 | kfree(kaddrs); | |
1034 | ||
1035 | return err; | |
1036 | } | |
1037 | ||
3f7a87d2 FF |
1038 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
1039 | * | |
1040 | * Common routine for handling connect() and sctp_connectx(). | |
1041 | * Connect will come in with just a single address. | |
1042 | */ | |
1043 | static int __sctp_connect(struct sock* sk, | |
1044 | struct sockaddr *kaddrs, | |
88a0a948 VY |
1045 | int addrs_size, |
1046 | sctp_assoc_t *assoc_id) | |
3f7a87d2 | 1047 | { |
55e26eb9 | 1048 | struct net *net = sock_net(sk); |
3f7a87d2 FF |
1049 | struct sctp_sock *sp; |
1050 | struct sctp_endpoint *ep; | |
1051 | struct sctp_association *asoc = NULL; | |
1052 | struct sctp_association *asoc2; | |
1053 | struct sctp_transport *transport; | |
1054 | union sctp_addr to; | |
1055 | struct sctp_af *af; | |
1056 | sctp_scope_t scope; | |
1057 | long timeo; | |
1058 | int err = 0; | |
1059 | int addrcnt = 0; | |
1060 | int walk_size = 0; | |
e4d1feab | 1061 | union sctp_addr *sa_addr = NULL; |
3f7a87d2 | 1062 | void *addr_buf; |
16d00fb7 | 1063 | unsigned short port; |
f50f95ca | 1064 | unsigned int f_flags = 0; |
3f7a87d2 FF |
1065 | |
1066 | sp = sctp_sk(sk); | |
1067 | ep = sp->ep; | |
1068 | ||
1069 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
1070 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1071 | * is already connected. | |
1072 | * It cannot be done even on a TCP-style listening socket. | |
1073 | */ | |
1074 | if (sctp_sstate(sk, ESTABLISHED) || | |
1075 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1076 | err = -EISCONN; | |
1077 | goto out_free; | |
1078 | } | |
1079 | ||
1080 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1081 | addr_buf = kaddrs; | |
1082 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
1083 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
1084 | err = -EINVAL; | |
1085 | goto out_free; | |
1086 | } | |
1087 | ||
ea110733 | 1088 | sa_addr = addr_buf; |
4bdf4b5f | 1089 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
3f7a87d2 FF |
1090 | |
1091 | /* If the address family is not supported or if this address | |
1092 | * causes the address buffer to overflow return EINVAL. | |
1093 | */ | |
1094 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1095 | err = -EINVAL; | |
1096 | goto out_free; | |
1097 | } | |
1098 | ||
d7e0d19a DR |
1099 | port = ntohs(sa_addr->v4.sin_port); |
1100 | ||
e4d1feab VY |
1101 | /* Save current address so we can work with it */ |
1102 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1103 | ||
1104 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
3f7a87d2 FF |
1105 | if (err) |
1106 | goto out_free; | |
1107 | ||
16d00fb7 VY |
1108 | /* Make sure the destination port is correctly set |
1109 | * in all addresses. | |
1110 | */ | |
524fba6c WY |
1111 | if (asoc && asoc->peer.port && asoc->peer.port != port) { |
1112 | err = -EINVAL; | |
16d00fb7 | 1113 | goto out_free; |
524fba6c | 1114 | } |
3f7a87d2 FF |
1115 | |
1116 | /* Check if there already is a matching association on the | |
1117 | * endpoint (other than the one created here). | |
1118 | */ | |
e4d1feab | 1119 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1120 | if (asoc2 && asoc2 != asoc) { |
1121 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1122 | err = -EISCONN; | |
1123 | else | |
1124 | err = -EALREADY; | |
1125 | goto out_free; | |
1126 | } | |
1127 | ||
1128 | /* If we could not find a matching association on the endpoint, | |
1129 | * make sure that there is no peeled-off association matching | |
1130 | * the peer address even on another socket. | |
1131 | */ | |
e4d1feab | 1132 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1133 | err = -EADDRNOTAVAIL; |
1134 | goto out_free; | |
1135 | } | |
1136 | ||
1137 | if (!asoc) { | |
1138 | /* If a bind() or sctp_bindx() is not called prior to | |
1139 | * an sctp_connectx() call, the system picks an | |
1140 | * ephemeral port and will choose an address set | |
1141 | * equivalent to binding with a wildcard address. | |
1142 | */ | |
1143 | if (!ep->base.bind_addr.port) { | |
1144 | if (sctp_autobind(sk)) { | |
1145 | err = -EAGAIN; | |
1146 | goto out_free; | |
1147 | } | |
64a0c1c8 ISJ |
1148 | } else { |
1149 | /* | |
d808ad9a YH |
1150 | * If an unprivileged user inherits a 1-many |
1151 | * style socket with open associations on a | |
1152 | * privileged port, it MAY be permitted to | |
1153 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1154 | * be permitted to open new associations. |
1155 | */ | |
1156 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1157 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1158 | err = -EACCES; |
1159 | goto out_free; | |
1160 | } | |
3f7a87d2 FF |
1161 | } |
1162 | ||
e4d1feab | 1163 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1164 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1165 | if (!asoc) { | |
1166 | err = -ENOMEM; | |
1167 | goto out_free; | |
1168 | } | |
409b95af VY |
1169 | |
1170 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1171 | GFP_KERNEL); | |
1172 | if (err < 0) { | |
1173 | goto out_free; | |
1174 | } | |
1175 | ||
3f7a87d2 FF |
1176 | } |
1177 | ||
1178 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1179 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1180 | SCTP_UNKNOWN); |
1181 | if (!transport) { | |
1182 | err = -ENOMEM; | |
1183 | goto out_free; | |
1184 | } | |
1185 | ||
1186 | addrcnt++; | |
1187 | addr_buf += af->sockaddr_len; | |
1188 | walk_size += af->sockaddr_len; | |
1189 | } | |
1190 | ||
c6ba68a2 VY |
1191 | /* In case the user of sctp_connectx() wants an association |
1192 | * id back, assign one now. | |
1193 | */ | |
1194 | if (assoc_id) { | |
1195 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1196 | if (err < 0) | |
1197 | goto out_free; | |
1198 | } | |
1199 | ||
55e26eb9 | 1200 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
3f7a87d2 FF |
1201 | if (err < 0) { |
1202 | goto out_free; | |
1203 | } | |
1204 | ||
1205 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1206 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
e4d1feab VY |
1207 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1208 | af->to_sk_daddr(sa_addr, sk); | |
8de8c873 | 1209 | sk->sk_err = 0; |
3f7a87d2 | 1210 | |
f50f95ca VY |
1211 | /* in-kernel sockets don't generally have a file allocated to them |
1212 | * if all they do is call sock_create_kern(). | |
1213 | */ | |
1214 | if (sk->sk_socket->file) | |
1215 | f_flags = sk->sk_socket->file->f_flags; | |
1216 | ||
1217 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1218 | ||
3f7a87d2 | 1219 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1220 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1221 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1222 | |
1223 | /* Don't free association on exit. */ | |
1224 | asoc = NULL; | |
1225 | ||
1226 | out_free: | |
bb33381d DB |
1227 | pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n", |
1228 | __func__, asoc, kaddrs, err); | |
3f7a87d2 | 1229 | |
2eebc1e1 NH |
1230 | if (asoc) { |
1231 | /* sctp_primitive_ASSOCIATE may have added this association | |
1232 | * To the hash table, try to unhash it, just in case, its a noop | |
1233 | * if it wasn't hashed so we're safe | |
1234 | */ | |
1235 | sctp_unhash_established(asoc); | |
3f7a87d2 | 1236 | sctp_association_free(asoc); |
2eebc1e1 | 1237 | } |
3f7a87d2 FF |
1238 | return err; |
1239 | } | |
1240 | ||
1241 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1242 | * | |
1243 | * API 8.9 | |
88a0a948 VY |
1244 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1245 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1246 | * |
1247 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1248 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1249 | * or IPv6 addresses. | |
1250 | * | |
1251 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1252 | * Section 3.1.2 for this usage. | |
1253 | * | |
1254 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1255 | * address is contained in its appropriate structure (i.e. struct | |
1256 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1257 | * must be used to distengish the address length (note that this | |
1258 | * representation is termed a "packed array" of addresses). The caller | |
1259 | * specifies the number of addresses in the array with addrcnt. | |
1260 | * | |
88a0a948 VY |
1261 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1262 | * the association id of the new association. On failure, sctp_connectx() | |
1263 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1264 | * is not touched by the kernel. | |
3f7a87d2 FF |
1265 | * |
1266 | * For SCTP, the port given in each socket address must be the same, or | |
1267 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1268 | * | |
1269 | * An application can use sctp_connectx to initiate an association with | |
1270 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1271 | * allows a caller to specify multiple addresses at which a peer can be | |
1272 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1273 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1274 | * specifies that the stack will try to make use of all the addresses in |
1275 | * the list when needed. | |
1276 | * | |
1277 | * Note that the list of addresses passed in is only used for setting up | |
1278 | * the association. It does not necessarily equal the set of addresses | |
1279 | * the peer uses for the resulting association. If the caller wants to | |
1280 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1281 | * retrieve them after the association has been set up. | |
1282 | * | |
1283 | * Basically do nothing but copying the addresses from user to kernel | |
1284 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1285 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1286 | * | |
1287 | * We don't use copy_from_user() for optimization: we first do the | |
1288 | * sanity checks (buffer size -fast- and access check-healthy | |
1289 | * pointer); if all of those succeed, then we can alloc the memory | |
1290 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1291 | * the copying without checking the user space area | |
1292 | * (__copy_from_user()). | |
1293 | * | |
1294 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1295 | * it. | |
1296 | * | |
1297 | * sk The sk of the socket | |
1298 | * addrs The pointer to the addresses in user land | |
1299 | * addrssize Size of the addrs buffer | |
1300 | * | |
88a0a948 | 1301 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1302 | */ |
dda91928 | 1303 | static int __sctp_setsockopt_connectx(struct sock* sk, |
3f7a87d2 | 1304 | struct sockaddr __user *addrs, |
88a0a948 VY |
1305 | int addrs_size, |
1306 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1307 | { |
1308 | int err = 0; | |
1309 | struct sockaddr *kaddrs; | |
1310 | ||
bb33381d DB |
1311 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n", |
1312 | __func__, sk, addrs, addrs_size); | |
3f7a87d2 FF |
1313 | |
1314 | if (unlikely(addrs_size <= 0)) | |
1315 | return -EINVAL; | |
1316 | ||
1317 | /* Check the user passed a healthy pointer. */ | |
1318 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1319 | return -EFAULT; | |
1320 | ||
1321 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 1322 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
3f7a87d2 FF |
1323 | if (unlikely(!kaddrs)) |
1324 | return -ENOMEM; | |
1325 | ||
1326 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1327 | err = -EFAULT; | |
1328 | } else { | |
88a0a948 | 1329 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1330 | } |
1331 | ||
1332 | kfree(kaddrs); | |
88a0a948 | 1333 | |
3f7a87d2 FF |
1334 | return err; |
1335 | } | |
1336 | ||
88a0a948 VY |
1337 | /* |
1338 | * This is an older interface. It's kept for backward compatibility | |
1339 | * to the option that doesn't provide association id. | |
1340 | */ | |
dda91928 DB |
1341 | static int sctp_setsockopt_connectx_old(struct sock* sk, |
1342 | struct sockaddr __user *addrs, | |
1343 | int addrs_size) | |
88a0a948 VY |
1344 | { |
1345 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1346 | } | |
1347 | ||
1348 | /* | |
1349 | * New interface for the API. The since the API is done with a socket | |
1350 | * option, to make it simple we feed back the association id is as a return | |
1351 | * indication to the call. Error is always negative and association id is | |
1352 | * always positive. | |
1353 | */ | |
dda91928 DB |
1354 | static int sctp_setsockopt_connectx(struct sock* sk, |
1355 | struct sockaddr __user *addrs, | |
1356 | int addrs_size) | |
88a0a948 VY |
1357 | { |
1358 | sctp_assoc_t assoc_id = 0; | |
1359 | int err = 0; | |
1360 | ||
1361 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1362 | ||
1363 | if (err) | |
1364 | return err; | |
1365 | else | |
1366 | return assoc_id; | |
1367 | } | |
1368 | ||
c6ba68a2 | 1369 | /* |
f9c67811 VY |
1370 | * New (hopefully final) interface for the API. |
1371 | * We use the sctp_getaddrs_old structure so that use-space library | |
1372 | * can avoid any unnecessary allocations. The only defferent part | |
1373 | * is that we store the actual length of the address buffer into the | |
1374 | * addrs_num structure member. That way we can re-use the existing | |
1375 | * code. | |
c6ba68a2 | 1376 | */ |
dda91928 DB |
1377 | static int sctp_getsockopt_connectx3(struct sock* sk, int len, |
1378 | char __user *optval, | |
1379 | int __user *optlen) | |
c6ba68a2 | 1380 | { |
f9c67811 | 1381 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1382 | sctp_assoc_t assoc_id = 0; |
1383 | int err = 0; | |
1384 | ||
f9c67811 | 1385 | if (len < sizeof(param)) |
c6ba68a2 VY |
1386 | return -EINVAL; |
1387 | ||
f9c67811 VY |
1388 | if (copy_from_user(¶m, optval, sizeof(param))) |
1389 | return -EFAULT; | |
1390 | ||
c6ba68a2 | 1391 | err = __sctp_setsockopt_connectx(sk, |
f9c67811 VY |
1392 | (struct sockaddr __user *)param.addrs, |
1393 | param.addr_num, &assoc_id); | |
c6ba68a2 VY |
1394 | |
1395 | if (err == 0 || err == -EINPROGRESS) { | |
1396 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1397 | return -EFAULT; | |
1398 | if (put_user(sizeof(assoc_id), optlen)) | |
1399 | return -EFAULT; | |
1400 | } | |
1401 | ||
1402 | return err; | |
1403 | } | |
1404 | ||
1da177e4 LT |
1405 | /* API 3.1.4 close() - UDP Style Syntax |
1406 | * Applications use close() to perform graceful shutdown (as described in | |
1407 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1408 | * by a UDP-style socket. | |
1409 | * | |
1410 | * The syntax is | |
1411 | * | |
1412 | * ret = close(int sd); | |
1413 | * | |
1414 | * sd - the socket descriptor of the associations to be closed. | |
1415 | * | |
1416 | * To gracefully shutdown a specific association represented by the | |
1417 | * UDP-style socket, an application should use the sendmsg() call, | |
1418 | * passing no user data, but including the appropriate flag in the | |
1419 | * ancillary data (see Section xxxx). | |
1420 | * | |
1421 | * If sd in the close() call is a branched-off socket representing only | |
1422 | * one association, the shutdown is performed on that association only. | |
1423 | * | |
1424 | * 4.1.6 close() - TCP Style Syntax | |
1425 | * | |
1426 | * Applications use close() to gracefully close down an association. | |
1427 | * | |
1428 | * The syntax is: | |
1429 | * | |
1430 | * int close(int sd); | |
1431 | * | |
1432 | * sd - the socket descriptor of the association to be closed. | |
1433 | * | |
1434 | * After an application calls close() on a socket descriptor, no further | |
1435 | * socket operations will succeed on that descriptor. | |
1436 | * | |
1437 | * API 7.1.4 SO_LINGER | |
1438 | * | |
1439 | * An application using the TCP-style socket can use this option to | |
1440 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1441 | * | |
1442 | * struct linger { | |
1443 | * int l_onoff; // option on/off | |
1444 | * int l_linger; // linger time | |
1445 | * }; | |
1446 | * | |
1447 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1448 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1449 | * value is set to a negative value, the setsockopt() call will return | |
1450 | * an error. If the value is set to a positive value linger_time, the | |
1451 | * close() can be blocked for at most linger_time ms. If the graceful | |
1452 | * shutdown phase does not finish during this period, close() will | |
1453 | * return but the graceful shutdown phase continues in the system. | |
1454 | */ | |
dda91928 | 1455 | static void sctp_close(struct sock *sk, long timeout) |
1da177e4 | 1456 | { |
55e26eb9 | 1457 | struct net *net = sock_net(sk); |
1da177e4 LT |
1458 | struct sctp_endpoint *ep; |
1459 | struct sctp_association *asoc; | |
1460 | struct list_head *pos, *temp; | |
cd4fcc70 | 1461 | unsigned int data_was_unread; |
1da177e4 | 1462 | |
bb33381d | 1463 | pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout); |
1da177e4 LT |
1464 | |
1465 | sctp_lock_sock(sk); | |
1466 | sk->sk_shutdown = SHUTDOWN_MASK; | |
bec9640b | 1467 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1468 | |
1469 | ep = sctp_sk(sk)->ep; | |
1470 | ||
cd4fcc70 TG |
1471 | /* Clean up any skbs sitting on the receive queue. */ |
1472 | data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1473 | data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1474 | ||
61c9fed4 | 1475 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1476 | list_for_each_safe(pos, temp, &ep->asocs) { |
1477 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1478 | ||
1479 | if (sctp_style(sk, TCP)) { | |
1480 | /* A closed association can still be in the list if | |
1481 | * it belongs to a TCP-style listening socket that is | |
1482 | * not yet accepted. If so, free it. If not, send an | |
1483 | * ABORT or SHUTDOWN based on the linger options. | |
1484 | */ | |
1485 | if (sctp_state(asoc, CLOSED)) { | |
1486 | sctp_unhash_established(asoc); | |
1487 | sctp_association_free(asoc); | |
b89498a1 VY |
1488 | continue; |
1489 | } | |
1490 | } | |
1da177e4 | 1491 | |
cd4fcc70 TG |
1492 | if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) || |
1493 | !skb_queue_empty(&asoc->ulpq.reasm) || | |
1494 | (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) { | |
b9ac8672 SS |
1495 | struct sctp_chunk *chunk; |
1496 | ||
1497 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1498 | if (chunk) | |
55e26eb9 | 1499 | sctp_primitive_ABORT(net, asoc, chunk); |
b9ac8672 | 1500 | } else |
55e26eb9 | 1501 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1502 | } |
1503 | ||
1da177e4 LT |
1504 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1505 | if (sctp_style(sk, TCP) && timeout) | |
1506 | sctp_wait_for_close(sk, timeout); | |
1507 | ||
1508 | /* This will run the backlog queue. */ | |
1509 | sctp_release_sock(sk); | |
1510 | ||
1511 | /* Supposedly, no process has access to the socket, but | |
1512 | * the net layers still may. | |
1513 | */ | |
1514 | sctp_local_bh_disable(); | |
1515 | sctp_bh_lock_sock(sk); | |
1516 | ||
1517 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1518 | * and we have just a little more cleanup. | |
1519 | */ | |
1520 | sock_hold(sk); | |
1521 | sk_common_release(sk); | |
1522 | ||
1523 | sctp_bh_unlock_sock(sk); | |
1524 | sctp_local_bh_enable(); | |
1525 | ||
1526 | sock_put(sk); | |
1527 | ||
1528 | SCTP_DBG_OBJCNT_DEC(sock); | |
1529 | } | |
1530 | ||
1531 | /* Handle EPIPE error. */ | |
1532 | static int sctp_error(struct sock *sk, int flags, int err) | |
1533 | { | |
1534 | if (err == -EPIPE) | |
1535 | err = sock_error(sk) ? : -EPIPE; | |
1536 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1537 | send_sig(SIGPIPE, current, 0); | |
1538 | return err; | |
1539 | } | |
1540 | ||
1541 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1542 | * | |
1543 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1544 | * and receive data from its peer. | |
1545 | * | |
1546 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1547 | * int flags); | |
1548 | * | |
1549 | * socket - the socket descriptor of the endpoint. | |
1550 | * message - pointer to the msghdr structure which contains a single | |
1551 | * user message and possibly some ancillary data. | |
1552 | * | |
1553 | * See Section 5 for complete description of the data | |
1554 | * structures. | |
1555 | * | |
1556 | * flags - flags sent or received with the user message, see Section | |
1557 | * 5 for complete description of the flags. | |
1558 | * | |
1559 | * Note: This function could use a rewrite especially when explicit | |
1560 | * connect support comes in. | |
1561 | */ | |
1562 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1563 | ||
dda91928 | 1564 | static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); |
1da177e4 | 1565 | |
dda91928 DB |
1566 | static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, |
1567 | struct msghdr *msg, size_t msg_len) | |
1da177e4 | 1568 | { |
55e26eb9 | 1569 | struct net *net = sock_net(sk); |
1da177e4 LT |
1570 | struct sctp_sock *sp; |
1571 | struct sctp_endpoint *ep; | |
1572 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1573 | struct sctp_transport *transport, *chunk_tp; | |
1574 | struct sctp_chunk *chunk; | |
dce116ae | 1575 | union sctp_addr to; |
1da177e4 | 1576 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1577 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1578 | struct sctp_sndrcvinfo *sinfo; |
1579 | struct sctp_initmsg *sinit; | |
1580 | sctp_assoc_t associd = 0; | |
1581 | sctp_cmsgs_t cmsgs = { NULL }; | |
1582 | int err; | |
1583 | sctp_scope_t scope; | |
1584 | long timeo; | |
1585 | __u16 sinfo_flags = 0; | |
1586 | struct sctp_datamsg *datamsg; | |
1da177e4 LT |
1587 | int msg_flags = msg->msg_flags; |
1588 | ||
1da177e4 LT |
1589 | err = 0; |
1590 | sp = sctp_sk(sk); | |
1591 | ep = sp->ep; | |
1592 | ||
bb33381d DB |
1593 | pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk, |
1594 | msg, msg_len, ep); | |
1da177e4 LT |
1595 | |
1596 | /* We cannot send a message over a TCP-style listening socket. */ | |
1597 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1598 | err = -EPIPE; | |
1599 | goto out_nounlock; | |
1600 | } | |
1601 | ||
1602 | /* Parse out the SCTP CMSGs. */ | |
1603 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1da177e4 | 1604 | if (err) { |
bb33381d | 1605 | pr_debug("%s: msghdr parse err:%x\n", __func__, err); |
1da177e4 LT |
1606 | goto out_nounlock; |
1607 | } | |
1608 | ||
1609 | /* Fetch the destination address for this packet. This | |
1610 | * address only selects the association--it is not necessarily | |
1611 | * the address we will send to. | |
1612 | * For a peeled-off socket, msg_name is ignored. | |
1613 | */ | |
1614 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1615 | int msg_namelen = msg->msg_namelen; | |
1616 | ||
1617 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1618 | msg_namelen); | |
1619 | if (err) | |
1620 | return err; | |
1621 | ||
1622 | if (msg_namelen > sizeof(to)) | |
1623 | msg_namelen = sizeof(to); | |
1624 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1625 | msg_name = msg->msg_name; |
1626 | } | |
1627 | ||
1628 | sinfo = cmsgs.info; | |
1629 | sinit = cmsgs.init; | |
1630 | ||
1631 | /* Did the user specify SNDRCVINFO? */ | |
1632 | if (sinfo) { | |
1633 | sinfo_flags = sinfo->sinfo_flags; | |
1634 | associd = sinfo->sinfo_assoc_id; | |
1635 | } | |
1636 | ||
bb33381d DB |
1637 | pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__, |
1638 | msg_len, sinfo_flags); | |
1da177e4 | 1639 | |
eaa5c54d ISJ |
1640 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1641 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1642 | err = -EINVAL; |
1643 | goto out_nounlock; | |
1644 | } | |
1645 | ||
eaa5c54d ISJ |
1646 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1647 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1648 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1649 | * the msg_iov set to the user abort reason. |
d808ad9a | 1650 | */ |
eaa5c54d ISJ |
1651 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1652 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1653 | err = -EINVAL; |
1654 | goto out_nounlock; | |
1655 | } | |
1656 | ||
eaa5c54d | 1657 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1658 | * specified in msg_name. |
1659 | */ | |
eaa5c54d | 1660 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1661 | err = -EINVAL; |
1662 | goto out_nounlock; | |
1663 | } | |
1664 | ||
1665 | transport = NULL; | |
1666 | ||
bb33381d | 1667 | pr_debug("%s: about to look up association\n", __func__); |
1da177e4 LT |
1668 | |
1669 | sctp_lock_sock(sk); | |
1670 | ||
1671 | /* If a msg_name has been specified, assume this is to be used. */ | |
1672 | if (msg_name) { | |
1673 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1674 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1675 | if (!asoc) { |
1676 | /* If we could not find a matching association on the | |
1677 | * endpoint, make sure that it is not a TCP-style | |
1678 | * socket that already has an association or there is | |
1679 | * no peeled-off association on another socket. | |
1680 | */ | |
1681 | if ((sctp_style(sk, TCP) && | |
1682 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1683 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1684 | err = -EADDRNOTAVAIL; |
1685 | goto out_unlock; | |
1686 | } | |
1687 | } | |
1688 | } else { | |
1689 | asoc = sctp_id2assoc(sk, associd); | |
1690 | if (!asoc) { | |
1691 | err = -EPIPE; | |
1692 | goto out_unlock; | |
1693 | } | |
1694 | } | |
1695 | ||
1696 | if (asoc) { | |
bb33381d | 1697 | pr_debug("%s: just looked up association:%p\n", __func__, asoc); |
1da177e4 LT |
1698 | |
1699 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1700 | * socket that has an association in CLOSED state. This can | |
1701 | * happen when an accepted socket has an association that is | |
1702 | * already CLOSED. | |
1703 | */ | |
1704 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1705 | err = -EPIPE; | |
1706 | goto out_unlock; | |
1707 | } | |
1708 | ||
eaa5c54d | 1709 | if (sinfo_flags & SCTP_EOF) { |
bb33381d DB |
1710 | pr_debug("%s: shutting down association:%p\n", |
1711 | __func__, asoc); | |
1712 | ||
55e26eb9 | 1713 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1714 | err = 0; |
1715 | goto out_unlock; | |
1716 | } | |
eaa5c54d | 1717 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1718 | |
1719 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1720 | if (!chunk) { | |
1721 | err = -ENOMEM; | |
1722 | goto out_unlock; | |
1723 | } | |
1724 | ||
bb33381d DB |
1725 | pr_debug("%s: aborting association:%p\n", |
1726 | __func__, asoc); | |
1727 | ||
55e26eb9 | 1728 | sctp_primitive_ABORT(net, asoc, chunk); |
1da177e4 LT |
1729 | err = 0; |
1730 | goto out_unlock; | |
1731 | } | |
1732 | } | |
1733 | ||
1734 | /* Do we need to create the association? */ | |
1735 | if (!asoc) { | |
bb33381d | 1736 | pr_debug("%s: there is no association yet\n", __func__); |
1da177e4 | 1737 | |
eaa5c54d | 1738 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1739 | err = -EINVAL; |
1740 | goto out_unlock; | |
1741 | } | |
1742 | ||
1743 | /* Check for invalid stream against the stream counts, | |
1744 | * either the default or the user specified stream counts. | |
1745 | */ | |
1746 | if (sinfo) { | |
1747 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1748 | /* Check against the defaults. */ | |
1749 | if (sinfo->sinfo_stream >= | |
1750 | sp->initmsg.sinit_num_ostreams) { | |
1751 | err = -EINVAL; | |
1752 | goto out_unlock; | |
1753 | } | |
1754 | } else { | |
1755 | /* Check against the requested. */ | |
1756 | if (sinfo->sinfo_stream >= | |
1757 | sinit->sinit_num_ostreams) { | |
1758 | err = -EINVAL; | |
1759 | goto out_unlock; | |
1760 | } | |
1761 | } | |
1762 | } | |
1763 | ||
1764 | /* | |
1765 | * API 3.1.2 bind() - UDP Style Syntax | |
1766 | * If a bind() or sctp_bindx() is not called prior to a | |
1767 | * sendmsg() call that initiates a new association, the | |
1768 | * system picks an ephemeral port and will choose an address | |
1769 | * set equivalent to binding with a wildcard address. | |
1770 | */ | |
1771 | if (!ep->base.bind_addr.port) { | |
1772 | if (sctp_autobind(sk)) { | |
1773 | err = -EAGAIN; | |
1774 | goto out_unlock; | |
1775 | } | |
64a0c1c8 ISJ |
1776 | } else { |
1777 | /* | |
1778 | * If an unprivileged user inherits a one-to-many | |
1779 | * style socket with open associations on a privileged | |
1780 | * port, it MAY be permitted to accept new associations, | |
1781 | * but it SHOULD NOT be permitted to open new | |
1782 | * associations. | |
1783 | */ | |
1784 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1785 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1786 | err = -EACCES; |
1787 | goto out_unlock; | |
1788 | } | |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | scope = sctp_scope(&to); | |
1792 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1793 | if (!new_asoc) { | |
1794 | err = -ENOMEM; | |
1795 | goto out_unlock; | |
1796 | } | |
1797 | asoc = new_asoc; | |
409b95af VY |
1798 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1799 | if (err < 0) { | |
1800 | err = -ENOMEM; | |
1801 | goto out_free; | |
1802 | } | |
1da177e4 LT |
1803 | |
1804 | /* If the SCTP_INIT ancillary data is specified, set all | |
1805 | * the association init values accordingly. | |
1806 | */ | |
1807 | if (sinit) { | |
1808 | if (sinit->sinit_num_ostreams) { | |
1809 | asoc->c.sinit_num_ostreams = | |
1810 | sinit->sinit_num_ostreams; | |
1811 | } | |
1812 | if (sinit->sinit_max_instreams) { | |
1813 | asoc->c.sinit_max_instreams = | |
1814 | sinit->sinit_max_instreams; | |
1815 | } | |
1816 | if (sinit->sinit_max_attempts) { | |
1817 | asoc->max_init_attempts | |
1818 | = sinit->sinit_max_attempts; | |
1819 | } | |
1820 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1821 | asoc->max_init_timeo = |
1da177e4 LT |
1822 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1823 | } | |
1824 | } | |
1825 | ||
1826 | /* Prime the peer's transport structures. */ | |
dce116ae | 1827 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1828 | if (!transport) { |
1829 | err = -ENOMEM; | |
1830 | goto out_free; | |
1831 | } | |
1da177e4 LT |
1832 | } |
1833 | ||
1834 | /* ASSERT: we have a valid association at this point. */ | |
bb33381d | 1835 | pr_debug("%s: we have a valid association\n", __func__); |
1da177e4 LT |
1836 | |
1837 | if (!sinfo) { | |
1838 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1839 | * some defaults. | |
1840 | */ | |
517aa0bc | 1841 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1842 | default_sinfo.sinfo_stream = asoc->default_stream; |
1843 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1844 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1845 | default_sinfo.sinfo_context = asoc->default_context; | |
1846 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1847 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1848 | sinfo = &default_sinfo; | |
1849 | } | |
1850 | ||
1851 | /* API 7.1.7, the sndbuf size per association bounds the | |
1852 | * maximum size of data that can be sent in a single send call. | |
1853 | */ | |
1854 | if (msg_len > sk->sk_sndbuf) { | |
1855 | err = -EMSGSIZE; | |
1856 | goto out_free; | |
1857 | } | |
1858 | ||
8a479491 | 1859 | if (asoc->pmtu_pending) |
02f3d4ce | 1860 | sctp_assoc_pending_pmtu(sk, asoc); |
8a479491 | 1861 | |
1da177e4 LT |
1862 | /* If fragmentation is disabled and the message length exceeds the |
1863 | * association fragmentation point, return EMSGSIZE. The I-D | |
1864 | * does not specify what this error is, but this looks like | |
1865 | * a great fit. | |
1866 | */ | |
1867 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1868 | err = -EMSGSIZE; | |
1869 | goto out_free; | |
1870 | } | |
1871 | ||
afd7614c JP |
1872 | /* Check for invalid stream. */ |
1873 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1874 | err = -EINVAL; | |
1875 | goto out_free; | |
1da177e4 LT |
1876 | } |
1877 | ||
1878 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1879 | if (!sctp_wspace(asoc)) { | |
1880 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1881 | if (err) | |
1882 | goto out_free; | |
1883 | } | |
1884 | ||
1885 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1886 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1887 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1888 | */ |
1889 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1890 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1891 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1892 | if (!chunk_tp) { |
1893 | err = -EINVAL; | |
1894 | goto out_free; | |
1895 | } | |
1896 | } else | |
1897 | chunk_tp = NULL; | |
1898 | ||
1899 | /* Auto-connect, if we aren't connected already. */ | |
1900 | if (sctp_state(asoc, CLOSED)) { | |
55e26eb9 | 1901 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
1da177e4 LT |
1902 | if (err < 0) |
1903 | goto out_free; | |
bb33381d DB |
1904 | |
1905 | pr_debug("%s: we associated primitively\n", __func__); | |
1da177e4 LT |
1906 | } |
1907 | ||
1908 | /* Break the message into multiple chunks of maximum size. */ | |
1909 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
6e51fe75 TR |
1910 | if (IS_ERR(datamsg)) { |
1911 | err = PTR_ERR(datamsg); | |
1da177e4 LT |
1912 | goto out_free; |
1913 | } | |
1914 | ||
1915 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1916 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
80445cfb | 1917 | sctp_chunk_hold(chunk); |
1da177e4 LT |
1918 | |
1919 | /* Do accounting for the write space. */ | |
1920 | sctp_set_owner_w(chunk); | |
1921 | ||
1922 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1923 | } |
1924 | ||
9c5c62be VY |
1925 | /* Send it to the lower layers. Note: all chunks |
1926 | * must either fail or succeed. The lower layer | |
1927 | * works that way today. Keep it that way or this | |
1928 | * breaks. | |
1929 | */ | |
55e26eb9 | 1930 | err = sctp_primitive_SEND(net, asoc, datamsg); |
9c5c62be | 1931 | /* Did the lower layer accept the chunk? */ |
bb33381d | 1932 | if (err) { |
9c5c62be | 1933 | sctp_datamsg_free(datamsg); |
bb33381d DB |
1934 | goto out_free; |
1935 | } | |
9c5c62be | 1936 | |
bb33381d | 1937 | pr_debug("%s: we sent primitively\n", __func__); |
9c5c62be | 1938 | |
bb33381d DB |
1939 | sctp_datamsg_put(datamsg); |
1940 | err = msg_len; | |
1da177e4 LT |
1941 | |
1942 | /* If we are already past ASSOCIATE, the lower | |
1943 | * layers are responsible for association cleanup. | |
1944 | */ | |
1945 | goto out_unlock; | |
1946 | ||
1947 | out_free: | |
2eebc1e1 NH |
1948 | if (new_asoc) { |
1949 | sctp_unhash_established(asoc); | |
1da177e4 | 1950 | sctp_association_free(asoc); |
2eebc1e1 | 1951 | } |
1da177e4 LT |
1952 | out_unlock: |
1953 | sctp_release_sock(sk); | |
1954 | ||
1955 | out_nounlock: | |
1956 | return sctp_error(sk, msg_flags, err); | |
1957 | ||
1958 | #if 0 | |
1959 | do_sock_err: | |
1960 | if (msg_len) | |
1961 | err = msg_len; | |
1962 | else | |
1963 | err = sock_error(sk); | |
1964 | goto out; | |
1965 | ||
1966 | do_interrupted: | |
1967 | if (msg_len) | |
1968 | err = msg_len; | |
1969 | goto out; | |
1970 | #endif /* 0 */ | |
1971 | } | |
1972 | ||
1973 | /* This is an extended version of skb_pull() that removes the data from the | |
1974 | * start of a skb even when data is spread across the list of skb's in the | |
1975 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1976 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1977 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1978 | * could not be removed. | |
1979 | */ | |
1980 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1981 | { | |
1982 | struct sk_buff *list; | |
1983 | int skb_len = skb_headlen(skb); | |
1984 | int rlen; | |
1985 | ||
1986 | if (len <= skb_len) { | |
1987 | __skb_pull(skb, len); | |
1988 | return 0; | |
1989 | } | |
1990 | len -= skb_len; | |
1991 | __skb_pull(skb, skb_len); | |
1992 | ||
1b003be3 | 1993 | skb_walk_frags(skb, list) { |
1da177e4 LT |
1994 | rlen = sctp_skb_pull(list, len); |
1995 | skb->len -= (len-rlen); | |
1996 | skb->data_len -= (len-rlen); | |
1997 | ||
1998 | if (!rlen) | |
1999 | return 0; | |
2000 | ||
2001 | len = rlen; | |
2002 | } | |
2003 | ||
2004 | return len; | |
2005 | } | |
2006 | ||
2007 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
2008 | * | |
2009 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
2010 | * int flags); | |
2011 | * | |
2012 | * socket - the socket descriptor of the endpoint. | |
2013 | * message - pointer to the msghdr structure which contains a single | |
2014 | * user message and possibly some ancillary data. | |
2015 | * | |
2016 | * See Section 5 for complete description of the data | |
2017 | * structures. | |
2018 | * | |
2019 | * flags - flags sent or received with the user message, see Section | |
2020 | * 5 for complete description of the flags. | |
2021 | */ | |
2022 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
2023 | ||
dda91928 DB |
2024 | static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, |
2025 | struct msghdr *msg, size_t len, int noblock, | |
2026 | int flags, int *addr_len) | |
1da177e4 LT |
2027 | { |
2028 | struct sctp_ulpevent *event = NULL; | |
2029 | struct sctp_sock *sp = sctp_sk(sk); | |
2030 | struct sk_buff *skb; | |
2031 | int copied; | |
2032 | int err = 0; | |
2033 | int skb_len; | |
2034 | ||
bb33381d DB |
2035 | pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, " |
2036 | "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags, | |
2037 | addr_len); | |
1da177e4 LT |
2038 | |
2039 | sctp_lock_sock(sk); | |
2040 | ||
2041 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
2042 | err = -ENOTCONN; | |
2043 | goto out; | |
2044 | } | |
2045 | ||
2046 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
2047 | if (!skb) | |
2048 | goto out; | |
2049 | ||
2050 | /* Get the total length of the skb including any skb's in the | |
2051 | * frag_list. | |
2052 | */ | |
2053 | skb_len = skb->len; | |
2054 | ||
2055 | copied = skb_len; | |
2056 | if (copied > len) | |
2057 | copied = len; | |
2058 | ||
2059 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2060 | ||
2061 | event = sctp_skb2event(skb); | |
2062 | ||
2063 | if (err) | |
2064 | goto out_free; | |
2065 | ||
3b885787 | 2066 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2067 | if (sctp_ulpevent_is_notification(event)) { |
2068 | msg->msg_flags |= MSG_NOTIFICATION; | |
2069 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
2070 | } else { | |
2071 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
2072 | } | |
2073 | ||
2074 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
2075 | if (sp->subscribe.sctp_data_io_event) | |
2076 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
2077 | #if 0 | |
2078 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
2079 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
2080 | ip_cmsg_recv(msg, skb); | |
2081 | #endif | |
2082 | ||
2083 | err = copied; | |
2084 | ||
2085 | /* If skb's length exceeds the user's buffer, update the skb and | |
2086 | * push it back to the receive_queue so that the next call to | |
2087 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2088 | */ | |
2089 | if (skb_len > copied) { | |
2090 | msg->msg_flags &= ~MSG_EOR; | |
2091 | if (flags & MSG_PEEK) | |
2092 | goto out_free; | |
2093 | sctp_skb_pull(skb, copied); | |
2094 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2095 | ||
2096 | /* When only partial message is copied to the user, increase | |
2097 | * rwnd by that amount. If all the data in the skb is read, | |
2098 | * rwnd is updated when the event is freed. | |
2099 | */ | |
0eca8fee VY |
2100 | if (!sctp_ulpevent_is_notification(event)) |
2101 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2102 | goto out; |
2103 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2104 | (event->msg_flags & MSG_EOR)) | |
2105 | msg->msg_flags |= MSG_EOR; | |
2106 | else | |
2107 | msg->msg_flags &= ~MSG_EOR; | |
2108 | ||
2109 | out_free: | |
2110 | if (flags & MSG_PEEK) { | |
2111 | /* Release the skb reference acquired after peeking the skb in | |
2112 | * sctp_skb_recv_datagram(). | |
2113 | */ | |
2114 | kfree_skb(skb); | |
2115 | } else { | |
2116 | /* Free the event which includes releasing the reference to | |
2117 | * the owner of the skb, freeing the skb and updating the | |
2118 | * rwnd. | |
2119 | */ | |
2120 | sctp_ulpevent_free(event); | |
2121 | } | |
2122 | out: | |
2123 | sctp_release_sock(sk); | |
2124 | return err; | |
2125 | } | |
2126 | ||
2127 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2128 | * | |
2129 | * This option is a on/off flag. If enabled no SCTP message | |
2130 | * fragmentation will be performed. Instead if a message being sent | |
2131 | * exceeds the current PMTU size, the message will NOT be sent and | |
2132 | * instead a error will be indicated to the user. | |
2133 | */ | |
2134 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2135 | char __user *optval, |
2136 | unsigned int optlen) | |
1da177e4 LT |
2137 | { |
2138 | int val; | |
2139 | ||
2140 | if (optlen < sizeof(int)) | |
2141 | return -EINVAL; | |
2142 | ||
2143 | if (get_user(val, (int __user *)optval)) | |
2144 | return -EFAULT; | |
2145 | ||
2146 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2147 | ||
2148 | return 0; | |
2149 | } | |
2150 | ||
2151 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2152 | unsigned int optlen) |
1da177e4 | 2153 | { |
94912301 WY |
2154 | struct sctp_association *asoc; |
2155 | struct sctp_ulpevent *event; | |
2156 | ||
7e8616d8 | 2157 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2158 | return -EINVAL; |
2159 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2160 | return -EFAULT; | |
94912301 WY |
2161 | |
2162 | /* | |
2163 | * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT, | |
2164 | * if there is no data to be sent or retransmit, the stack will | |
2165 | * immediately send up this notification. | |
2166 | */ | |
2167 | if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT, | |
2168 | &sctp_sk(sk)->subscribe)) { | |
2169 | asoc = sctp_id2assoc(sk, 0); | |
2170 | ||
2171 | if (asoc && sctp_outq_is_empty(&asoc->outqueue)) { | |
2172 | event = sctp_ulpevent_make_sender_dry_event(asoc, | |
2173 | GFP_ATOMIC); | |
2174 | if (!event) | |
2175 | return -ENOMEM; | |
2176 | ||
2177 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
2178 | } | |
2179 | } | |
2180 | ||
1da177e4 LT |
2181 | return 0; |
2182 | } | |
2183 | ||
2184 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2185 | * | |
2186 | * This socket option is applicable to the UDP-style socket only. When | |
2187 | * set it will cause associations that are idle for more than the | |
2188 | * specified number of seconds to automatically close. An association | |
2189 | * being idle is defined an association that has NOT sent or received | |
2190 | * user data. The special value of '0' indicates that no automatic | |
2191 | * close of any associations should be performed. The option expects an | |
2192 | * integer defining the number of seconds of idle time before an | |
2193 | * association is closed. | |
2194 | */ | |
2195 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2196 | unsigned int optlen) |
1da177e4 LT |
2197 | { |
2198 | struct sctp_sock *sp = sctp_sk(sk); | |
2199 | ||
2200 | /* Applicable to UDP-style socket only */ | |
2201 | if (sctp_style(sk, TCP)) | |
2202 | return -EOPNOTSUPP; | |
2203 | if (optlen != sizeof(int)) | |
2204 | return -EINVAL; | |
2205 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2206 | return -EFAULT; | |
2207 | ||
1da177e4 LT |
2208 | return 0; |
2209 | } | |
2210 | ||
2211 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2212 | * | |
2213 | * Applications can enable or disable heartbeats for any peer address of | |
2214 | * an association, modify an address's heartbeat interval, force a | |
2215 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2216 | * number of retransmissions sent before an address is considered | |
2217 | * unreachable. The following structure is used to access and modify an | |
2218 | * address's parameters: | |
2219 | * | |
2220 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2221 | * sctp_assoc_t spp_assoc_id; |
2222 | * struct sockaddr_storage spp_address; | |
2223 | * uint32_t spp_hbinterval; | |
2224 | * uint16_t spp_pathmaxrxt; | |
2225 | * uint32_t spp_pathmtu; | |
2226 | * uint32_t spp_sackdelay; | |
2227 | * uint32_t spp_flags; | |
2228 | * }; | |
2229 | * | |
2230 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2231 | * application, and identifies the association for | |
2232 | * this query. | |
1da177e4 LT |
2233 | * spp_address - This specifies which address is of interest. |
2234 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2235 | * in milliseconds. If a value of zero |
2236 | * is present in this field then no changes are to | |
2237 | * be made to this parameter. | |
1da177e4 LT |
2238 | * spp_pathmaxrxt - This contains the maximum number of |
2239 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2240 | * considered unreachable. If a value of zero |
2241 | * is present in this field then no changes are to | |
2242 | * be made to this parameter. | |
2243 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2244 | * specified here will be the "fixed" path mtu. | |
2245 | * Note that if the spp_address field is empty | |
2246 | * then all associations on this address will | |
2247 | * have this fixed path mtu set upon them. | |
2248 | * | |
2249 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2250 | * the number of milliseconds that sacks will be delayed | |
2251 | * for. This value will apply to all addresses of an | |
2252 | * association if the spp_address field is empty. Note | |
2253 | * also, that if delayed sack is enabled and this | |
2254 | * value is set to 0, no change is made to the last | |
2255 | * recorded delayed sack timer value. | |
2256 | * | |
2257 | * spp_flags - These flags are used to control various features | |
2258 | * on an association. The flag field may contain | |
2259 | * zero or more of the following options. | |
2260 | * | |
2261 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2262 | * specified address. Note that if the address | |
2263 | * field is empty all addresses for the association | |
2264 | * have heartbeats enabled upon them. | |
2265 | * | |
2266 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2267 | * speicifed address. Note that if the address | |
2268 | * field is empty all addresses for the association | |
2269 | * will have their heartbeats disabled. Note also | |
2270 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2271 | * mutually exclusive, only one of these two should | |
2272 | * be specified. Enabling both fields will have | |
2273 | * undetermined results. | |
2274 | * | |
2275 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2276 | * to be made immediately. | |
2277 | * | |
bdf3092a VY |
2278 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2279 | * heartbeat delayis to be set to the value of 0 | |
2280 | * milliseconds. | |
2281 | * | |
52ccb8e9 FF |
2282 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2283 | * discovery upon the specified address. Note that | |
2284 | * if the address feild is empty then all addresses | |
2285 | * on the association are effected. | |
2286 | * | |
2287 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2288 | * discovery upon the specified address. Note that | |
2289 | * if the address feild is empty then all addresses | |
2290 | * on the association are effected. Not also that | |
2291 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2292 | * exclusive. Enabling both will have undetermined | |
2293 | * results. | |
2294 | * | |
2295 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2296 | * on delayed sack. The time specified in spp_sackdelay | |
2297 | * is used to specify the sack delay for this address. Note | |
2298 | * that if spp_address is empty then all addresses will | |
2299 | * enable delayed sack and take on the sack delay | |
2300 | * value specified in spp_sackdelay. | |
2301 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2302 | * off delayed sack. If the spp_address field is blank then | |
2303 | * delayed sack is disabled for the entire association. Note | |
2304 | * also that this field is mutually exclusive to | |
2305 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2306 | * results. | |
1da177e4 | 2307 | */ |
16164366 AB |
2308 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2309 | struct sctp_transport *trans, | |
2310 | struct sctp_association *asoc, | |
2311 | struct sctp_sock *sp, | |
2312 | int hb_change, | |
2313 | int pmtud_change, | |
2314 | int sackdelay_change) | |
52ccb8e9 FF |
2315 | { |
2316 | int error; | |
2317 | ||
2318 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
55e26eb9 EB |
2319 | struct net *net = sock_net(trans->asoc->base.sk); |
2320 | ||
2321 | error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans); | |
52ccb8e9 FF |
2322 | if (error) |
2323 | return error; | |
2324 | } | |
2325 | ||
bdf3092a VY |
2326 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2327 | * this field is ignored. Note also that a value of zero indicates | |
2328 | * the current setting should be left unchanged. | |
2329 | */ | |
2330 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2331 | ||
2332 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2333 | * set. This lets us use 0 value when this flag | |
2334 | * is set. | |
2335 | */ | |
2336 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2337 | params->spp_hbinterval = 0; | |
2338 | ||
2339 | if (params->spp_hbinterval || | |
2340 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2341 | if (trans) { | |
2342 | trans->hbinterval = | |
2343 | msecs_to_jiffies(params->spp_hbinterval); | |
2344 | } else if (asoc) { | |
2345 | asoc->hbinterval = | |
2346 | msecs_to_jiffies(params->spp_hbinterval); | |
2347 | } else { | |
2348 | sp->hbinterval = params->spp_hbinterval; | |
2349 | } | |
52ccb8e9 FF |
2350 | } |
2351 | } | |
2352 | ||
2353 | if (hb_change) { | |
2354 | if (trans) { | |
2355 | trans->param_flags = | |
2356 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2357 | } else if (asoc) { | |
2358 | asoc->param_flags = | |
2359 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2360 | } else { | |
2361 | sp->param_flags = | |
2362 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2363 | } | |
2364 | } | |
2365 | ||
bdf3092a VY |
2366 | /* When Path MTU discovery is disabled the value specified here will |
2367 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2368 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2369 | * effect). | |
2370 | */ | |
2371 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2372 | if (trans) { |
2373 | trans->pathmtu = params->spp_pathmtu; | |
02f3d4ce | 2374 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2375 | } else if (asoc) { |
2376 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2377 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2378 | } else { |
2379 | sp->pathmtu = params->spp_pathmtu; | |
2380 | } | |
2381 | } | |
2382 | ||
2383 | if (pmtud_change) { | |
2384 | if (trans) { | |
2385 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2386 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2387 | trans->param_flags = | |
2388 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2389 | if (update) { | |
9914ae3c | 2390 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
02f3d4ce | 2391 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2392 | } |
2393 | } else if (asoc) { | |
2394 | asoc->param_flags = | |
2395 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2396 | } else { | |
2397 | sp->param_flags = | |
2398 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2399 | } | |
2400 | } | |
2401 | ||
bdf3092a VY |
2402 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2403 | * value of this field is ignored. Note also that a value of zero | |
2404 | * indicates the current setting should be left unchanged. | |
2405 | */ | |
2406 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2407 | if (trans) { |
2408 | trans->sackdelay = | |
2409 | msecs_to_jiffies(params->spp_sackdelay); | |
2410 | } else if (asoc) { | |
2411 | asoc->sackdelay = | |
2412 | msecs_to_jiffies(params->spp_sackdelay); | |
2413 | } else { | |
2414 | sp->sackdelay = params->spp_sackdelay; | |
2415 | } | |
2416 | } | |
2417 | ||
2418 | if (sackdelay_change) { | |
2419 | if (trans) { | |
2420 | trans->param_flags = | |
2421 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2422 | sackdelay_change; | |
2423 | } else if (asoc) { | |
2424 | asoc->param_flags = | |
2425 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2426 | sackdelay_change; | |
2427 | } else { | |
2428 | sp->param_flags = | |
2429 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2430 | sackdelay_change; | |
2431 | } | |
2432 | } | |
2433 | ||
37051f73 APO |
2434 | /* Note that a value of zero indicates the current setting should be |
2435 | left unchanged. | |
bdf3092a | 2436 | */ |
37051f73 | 2437 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2438 | if (trans) { |
2439 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2440 | } else if (asoc) { | |
2441 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2442 | } else { | |
2443 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2444 | } | |
2445 | } | |
2446 | ||
2447 | return 0; | |
2448 | } | |
2449 | ||
1da177e4 | 2450 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2451 | char __user *optval, |
2452 | unsigned int optlen) | |
1da177e4 | 2453 | { |
52ccb8e9 FF |
2454 | struct sctp_paddrparams params; |
2455 | struct sctp_transport *trans = NULL; | |
2456 | struct sctp_association *asoc = NULL; | |
2457 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2458 | int error; |
52ccb8e9 | 2459 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2460 | |
2461 | if (optlen != sizeof(struct sctp_paddrparams)) | |
52ccb8e9 FF |
2462 | return - EINVAL; |
2463 | ||
1da177e4 LT |
2464 | if (copy_from_user(¶ms, optval, optlen)) |
2465 | return -EFAULT; | |
2466 | ||
52ccb8e9 FF |
2467 | /* Validate flags and value parameters. */ |
2468 | hb_change = params.spp_flags & SPP_HB; | |
2469 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2470 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2471 | ||
2472 | if (hb_change == SPP_HB || | |
2473 | pmtud_change == SPP_PMTUD || | |
2474 | sackdelay_change == SPP_SACKDELAY || | |
2475 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2476 | (params.spp_pathmtu && |
2477 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2478 | return -EINVAL; |
1da177e4 | 2479 | |
52ccb8e9 FF |
2480 | /* If an address other than INADDR_ANY is specified, and |
2481 | * no transport is found, then the request is invalid. | |
2482 | */ | |
52cae8f0 | 2483 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2484 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2485 | params.spp_assoc_id); | |
2486 | if (!trans) | |
1da177e4 | 2487 | return -EINVAL; |
1da177e4 LT |
2488 | } |
2489 | ||
52ccb8e9 FF |
2490 | /* Get association, if assoc_id != 0 and the socket is a one |
2491 | * to many style socket, and an association was not found, then | |
2492 | * the id was invalid. | |
2493 | */ | |
2494 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2495 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2496 | return -EINVAL; |
2497 | ||
52ccb8e9 FF |
2498 | /* Heartbeat demand can only be sent on a transport or |
2499 | * association, but not a socket. | |
1da177e4 | 2500 | */ |
52ccb8e9 FF |
2501 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2502 | return -EINVAL; | |
2503 | ||
2504 | /* Process parameters. */ | |
2505 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2506 | hb_change, pmtud_change, | |
2507 | sackdelay_change); | |
1da177e4 | 2508 | |
52ccb8e9 FF |
2509 | if (error) |
2510 | return error; | |
2511 | ||
2512 | /* If changes are for association, also apply parameters to each | |
2513 | * transport. | |
1da177e4 | 2514 | */ |
52ccb8e9 | 2515 | if (!trans && asoc) { |
9dbc15f0 RD |
2516 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2517 | transports) { | |
52ccb8e9 FF |
2518 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2519 | hb_change, pmtud_change, | |
2520 | sackdelay_change); | |
2521 | } | |
2522 | } | |
1da177e4 LT |
2523 | |
2524 | return 0; | |
2525 | } | |
2526 | ||
d364d927 WY |
2527 | /* |
2528 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2529 | * | |
2530 | * This option will effect the way delayed acks are performed. This | |
2531 | * option allows you to get or set the delayed ack time, in | |
2532 | * milliseconds. It also allows changing the delayed ack frequency. | |
2533 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2534 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2535 | * values. If the assoc_id field is non-zero, then the set or get | |
2536 | * effects the specified association for the one to many model (the | |
2537 | * assoc_id field is ignored by the one to one model). Note that if | |
2538 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2539 | * current values will remain unchanged. | |
2540 | * | |
2541 | * struct sctp_sack_info { | |
2542 | * sctp_assoc_t sack_assoc_id; | |
2543 | * uint32_t sack_delay; | |
2544 | * uint32_t sack_freq; | |
2545 | * }; | |
2546 | * | |
2547 | * sack_assoc_id - This parameter, indicates which association the user | |
2548 | * is performing an action upon. Note that if this field's value is | |
2549 | * zero then the endpoints default value is changed (effecting future | |
2550 | * associations only). | |
2551 | * | |
2552 | * sack_delay - This parameter contains the number of milliseconds that | |
2553 | * the user is requesting the delayed ACK timer be set to. Note that | |
2554 | * this value is defined in the standard to be between 200 and 500 | |
2555 | * milliseconds. | |
2556 | * | |
2557 | * sack_freq - This parameter contains the number of packets that must | |
2558 | * be received before a sack is sent without waiting for the delay | |
2559 | * timer to expire. The default value for this is 2, setting this | |
2560 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2561 | */ |
2562 | ||
d364d927 | 2563 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2564 | char __user *optval, unsigned int optlen) |
7708610b | 2565 | { |
d364d927 | 2566 | struct sctp_sack_info params; |
7708610b FF |
2567 | struct sctp_transport *trans = NULL; |
2568 | struct sctp_association *asoc = NULL; | |
2569 | struct sctp_sock *sp = sctp_sk(sk); | |
2570 | ||
d364d927 WY |
2571 | if (optlen == sizeof(struct sctp_sack_info)) { |
2572 | if (copy_from_user(¶ms, optval, optlen)) | |
2573 | return -EFAULT; | |
7708610b | 2574 | |
d364d927 WY |
2575 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2576 | return 0; | |
2577 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
2578 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
2579 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
2580 | if (copy_from_user(¶ms, optval, optlen)) |
2581 | return -EFAULT; | |
2582 | ||
2583 | if (params.sack_delay == 0) | |
2584 | params.sack_freq = 1; | |
2585 | else | |
2586 | params.sack_freq = 0; | |
2587 | } else | |
2588 | return - EINVAL; | |
7708610b FF |
2589 | |
2590 | /* Validate value parameter. */ | |
d364d927 | 2591 | if (params.sack_delay > 500) |
7708610b FF |
2592 | return -EINVAL; |
2593 | ||
d364d927 | 2594 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2595 | * to many style socket, and an association was not found, then |
2596 | * the id was invalid. | |
d808ad9a | 2597 | */ |
d364d927 WY |
2598 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2599 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2600 | return -EINVAL; |
2601 | ||
d364d927 | 2602 | if (params.sack_delay) { |
7708610b FF |
2603 | if (asoc) { |
2604 | asoc->sackdelay = | |
d364d927 | 2605 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2606 | asoc->param_flags = |
7708610b FF |
2607 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2608 | SPP_SACKDELAY_ENABLE; | |
2609 | } else { | |
d364d927 | 2610 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2611 | sp->param_flags = |
7708610b FF |
2612 | (sp->param_flags & ~SPP_SACKDELAY) | |
2613 | SPP_SACKDELAY_ENABLE; | |
2614 | } | |
d364d927 WY |
2615 | } |
2616 | ||
2617 | if (params.sack_freq == 1) { | |
7708610b | 2618 | if (asoc) { |
d808ad9a | 2619 | asoc->param_flags = |
7708610b FF |
2620 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2621 | SPP_SACKDELAY_DISABLE; | |
2622 | } else { | |
d808ad9a | 2623 | sp->param_flags = |
7708610b FF |
2624 | (sp->param_flags & ~SPP_SACKDELAY) | |
2625 | SPP_SACKDELAY_DISABLE; | |
2626 | } | |
d364d927 WY |
2627 | } else if (params.sack_freq > 1) { |
2628 | if (asoc) { | |
2629 | asoc->sackfreq = params.sack_freq; | |
2630 | asoc->param_flags = | |
2631 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2632 | SPP_SACKDELAY_ENABLE; | |
2633 | } else { | |
2634 | sp->sackfreq = params.sack_freq; | |
2635 | sp->param_flags = | |
2636 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2637 | SPP_SACKDELAY_ENABLE; | |
2638 | } | |
7708610b FF |
2639 | } |
2640 | ||
2641 | /* If change is for association, also apply to each transport. */ | |
2642 | if (asoc) { | |
9dbc15f0 RD |
2643 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2644 | transports) { | |
d364d927 | 2645 | if (params.sack_delay) { |
7708610b | 2646 | trans->sackdelay = |
d364d927 | 2647 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2648 | trans->param_flags = |
7708610b FF |
2649 | (trans->param_flags & ~SPP_SACKDELAY) | |
2650 | SPP_SACKDELAY_ENABLE; | |
d364d927 | 2651 | } |
7bfe8bdb | 2652 | if (params.sack_freq == 1) { |
d808ad9a | 2653 | trans->param_flags = |
7708610b FF |
2654 | (trans->param_flags & ~SPP_SACKDELAY) | |
2655 | SPP_SACKDELAY_DISABLE; | |
d364d927 WY |
2656 | } else if (params.sack_freq > 1) { |
2657 | trans->sackfreq = params.sack_freq; | |
2658 | trans->param_flags = | |
2659 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2660 | SPP_SACKDELAY_ENABLE; | |
7708610b FF |
2661 | } |
2662 | } | |
2663 | } | |
d808ad9a | 2664 | |
7708610b FF |
2665 | return 0; |
2666 | } | |
2667 | ||
1da177e4 LT |
2668 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2669 | * | |
2670 | * Applications can specify protocol parameters for the default association | |
2671 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2672 | * is SCTP_INITMSG. | |
2673 | * | |
2674 | * Setting initialization parameters is effective only on an unconnected | |
2675 | * socket (for UDP-style sockets only future associations are effected | |
2676 | * by the change). With TCP-style sockets, this option is inherited by | |
2677 | * sockets derived from a listener socket. | |
2678 | */ | |
b7058842 | 2679 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2680 | { |
2681 | struct sctp_initmsg sinit; | |
2682 | struct sctp_sock *sp = sctp_sk(sk); | |
2683 | ||
2684 | if (optlen != sizeof(struct sctp_initmsg)) | |
2685 | return -EINVAL; | |
2686 | if (copy_from_user(&sinit, optval, optlen)) | |
2687 | return -EFAULT; | |
2688 | ||
2689 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2690 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2691 | if (sinit.sinit_max_instreams) |
d808ad9a | 2692 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2693 | if (sinit.sinit_max_attempts) |
d808ad9a | 2694 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2695 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2696 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2697 | |
2698 | return 0; | |
2699 | } | |
2700 | ||
2701 | /* | |
2702 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2703 | * | |
2704 | * Applications that wish to use the sendto() system call may wish to | |
2705 | * specify a default set of parameters that would normally be supplied | |
2706 | * through the inclusion of ancillary data. This socket option allows | |
2707 | * such an application to set the default sctp_sndrcvinfo structure. | |
2708 | * The application that wishes to use this socket option simply passes | |
2709 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2710 | * 5.2.2) The input parameters accepted by this call include | |
2711 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2712 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2713 | * to this call if the caller is using the UDP model. | |
2714 | */ | |
2715 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2716 | char __user *optval, |
2717 | unsigned int optlen) | |
1da177e4 LT |
2718 | { |
2719 | struct sctp_sndrcvinfo info; | |
2720 | struct sctp_association *asoc; | |
2721 | struct sctp_sock *sp = sctp_sk(sk); | |
2722 | ||
2723 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2724 | return -EINVAL; | |
2725 | if (copy_from_user(&info, optval, optlen)) | |
2726 | return -EFAULT; | |
2727 | ||
2728 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2729 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2730 | return -EINVAL; | |
2731 | ||
2732 | if (asoc) { | |
2733 | asoc->default_stream = info.sinfo_stream; | |
2734 | asoc->default_flags = info.sinfo_flags; | |
2735 | asoc->default_ppid = info.sinfo_ppid; | |
2736 | asoc->default_context = info.sinfo_context; | |
2737 | asoc->default_timetolive = info.sinfo_timetolive; | |
2738 | } else { | |
2739 | sp->default_stream = info.sinfo_stream; | |
2740 | sp->default_flags = info.sinfo_flags; | |
2741 | sp->default_ppid = info.sinfo_ppid; | |
2742 | sp->default_context = info.sinfo_context; | |
2743 | sp->default_timetolive = info.sinfo_timetolive; | |
2744 | } | |
2745 | ||
2746 | return 0; | |
2747 | } | |
2748 | ||
2749 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2750 | * | |
2751 | * Requests that the local SCTP stack use the enclosed peer address as | |
2752 | * the association primary. The enclosed address must be one of the | |
2753 | * association peer's addresses. | |
2754 | */ | |
2755 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2756 | unsigned int optlen) |
1da177e4 LT |
2757 | { |
2758 | struct sctp_prim prim; | |
2759 | struct sctp_transport *trans; | |
2760 | ||
2761 | if (optlen != sizeof(struct sctp_prim)) | |
2762 | return -EINVAL; | |
2763 | ||
2764 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2765 | return -EFAULT; | |
2766 | ||
2767 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2768 | if (!trans) | |
2769 | return -EINVAL; | |
2770 | ||
2771 | sctp_assoc_set_primary(trans->asoc, trans); | |
2772 | ||
2773 | return 0; | |
2774 | } | |
2775 | ||
2776 | /* | |
2777 | * 7.1.5 SCTP_NODELAY | |
2778 | * | |
2779 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2780 | * generally sent as soon as possible and no unnecessary delays are | |
2781 | * introduced, at the cost of more packets in the network. Expects an | |
2782 | * integer boolean flag. | |
2783 | */ | |
2784 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2785 | unsigned int optlen) |
1da177e4 LT |
2786 | { |
2787 | int val; | |
2788 | ||
2789 | if (optlen < sizeof(int)) | |
2790 | return -EINVAL; | |
2791 | if (get_user(val, (int __user *)optval)) | |
2792 | return -EFAULT; | |
2793 | ||
2794 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2795 | return 0; | |
2796 | } | |
2797 | ||
2798 | /* | |
2799 | * | |
2800 | * 7.1.1 SCTP_RTOINFO | |
2801 | * | |
2802 | * The protocol parameters used to initialize and bound retransmission | |
2803 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2804 | * and modify these parameters. | |
2805 | * All parameters are time values, in milliseconds. A value of 0, when | |
2806 | * modifying the parameters, indicates that the current value should not | |
2807 | * be changed. | |
2808 | * | |
2809 | */ | |
b7058842 DM |
2810 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2811 | { | |
1da177e4 LT |
2812 | struct sctp_rtoinfo rtoinfo; |
2813 | struct sctp_association *asoc; | |
2814 | ||
2815 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2816 | return -EINVAL; | |
2817 | ||
2818 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2819 | return -EFAULT; | |
2820 | ||
2821 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2822 | ||
2823 | /* Set the values to the specific association */ | |
2824 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2825 | return -EINVAL; | |
2826 | ||
2827 | if (asoc) { | |
2828 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2829 | asoc->rto_initial = |
1da177e4 LT |
2830 | msecs_to_jiffies(rtoinfo.srto_initial); |
2831 | if (rtoinfo.srto_max != 0) | |
2832 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2833 | if (rtoinfo.srto_min != 0) | |
2834 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2835 | } else { | |
2836 | /* If there is no association or the association-id = 0 | |
2837 | * set the values to the endpoint. | |
2838 | */ | |
2839 | struct sctp_sock *sp = sctp_sk(sk); | |
2840 | ||
2841 | if (rtoinfo.srto_initial != 0) | |
2842 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2843 | if (rtoinfo.srto_max != 0) | |
2844 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2845 | if (rtoinfo.srto_min != 0) | |
2846 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2847 | } | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | ||
2852 | /* | |
2853 | * | |
2854 | * 7.1.2 SCTP_ASSOCINFO | |
2855 | * | |
59c51591 | 2856 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2857 | * of the association. |
2858 | * Returns an error if the new association retransmission value is | |
2859 | * greater than the sum of the retransmission value of the peer. | |
2860 | * See [SCTP] for more information. | |
2861 | * | |
2862 | */ | |
b7058842 | 2863 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2864 | { |
2865 | ||
2866 | struct sctp_assocparams assocparams; | |
2867 | struct sctp_association *asoc; | |
2868 | ||
2869 | if (optlen != sizeof(struct sctp_assocparams)) | |
2870 | return -EINVAL; | |
2871 | if (copy_from_user(&assocparams, optval, optlen)) | |
2872 | return -EFAULT; | |
2873 | ||
2874 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2875 | ||
2876 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2877 | return -EINVAL; | |
2878 | ||
2879 | /* Set the values to the specific association */ | |
2880 | if (asoc) { | |
402d68c4 VY |
2881 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2882 | __u32 path_sum = 0; | |
2883 | int paths = 0; | |
402d68c4 VY |
2884 | struct sctp_transport *peer_addr; |
2885 | ||
9dbc15f0 RD |
2886 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2887 | transports) { | |
402d68c4 VY |
2888 | path_sum += peer_addr->pathmaxrxt; |
2889 | paths++; | |
2890 | } | |
2891 | ||
025dfdaf | 2892 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2893 | * one path/transport. We do this because path |
2894 | * retransmissions are only counted when we have more | |
2895 | * then one path. | |
2896 | */ | |
2897 | if (paths > 1 && | |
2898 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2899 | return -EINVAL; | |
2900 | ||
1da177e4 | 2901 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2902 | } |
2903 | ||
52db882f DB |
2904 | if (assocparams.sasoc_cookie_life != 0) |
2905 | asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life); | |
1da177e4 LT |
2906 | } else { |
2907 | /* Set the values to the endpoint */ | |
2908 | struct sctp_sock *sp = sctp_sk(sk); | |
2909 | ||
2910 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2911 | sp->assocparams.sasoc_asocmaxrxt = | |
2912 | assocparams.sasoc_asocmaxrxt; | |
2913 | if (assocparams.sasoc_cookie_life != 0) | |
2914 | sp->assocparams.sasoc_cookie_life = | |
2915 | assocparams.sasoc_cookie_life; | |
2916 | } | |
2917 | return 0; | |
2918 | } | |
2919 | ||
2920 | /* | |
2921 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2922 | * | |
2923 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2924 | * addresses. If this option is turned on and the socket is type | |
2925 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2926 | * If this option is turned off, then no mapping will be done of V4 | |
2927 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2928 | * addresses on the socket. | |
2929 | */ | |
b7058842 | 2930 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2931 | { |
2932 | int val; | |
2933 | struct sctp_sock *sp = sctp_sk(sk); | |
2934 | ||
2935 | if (optlen < sizeof(int)) | |
2936 | return -EINVAL; | |
2937 | if (get_user(val, (int __user *)optval)) | |
2938 | return -EFAULT; | |
2939 | if (val) | |
2940 | sp->v4mapped = 1; | |
2941 | else | |
2942 | sp->v4mapped = 0; | |
2943 | ||
2944 | return 0; | |
2945 | } | |
2946 | ||
2947 | /* | |
e89c2095 WY |
2948 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2949 | * This option will get or set the maximum size to put in any outgoing | |
2950 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
2951 | * fragmented by SCTP into the specified size. Note that the underlying |
2952 | * SCTP implementation may fragment into smaller sized chunks when the | |
2953 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
2954 | * the user. The default value for this option is '0' which indicates |
2955 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2956 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2957 | * than the maximum size of an IP datagram will effectively let SCTP | |
2958 | * control fragmentation (i.e. the same as setting this option to 0). | |
2959 | * | |
2960 | * The following structure is used to access and modify this parameter: | |
2961 | * | |
2962 | * struct sctp_assoc_value { | |
2963 | * sctp_assoc_t assoc_id; | |
2964 | * uint32_t assoc_value; | |
2965 | * }; | |
2966 | * | |
2967 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2968 | * For one-to-many style sockets this parameter indicates which | |
2969 | * association the user is performing an action upon. Note that if | |
2970 | * this field's value is zero then the endpoints default value is | |
2971 | * changed (effecting future associations only). | |
2972 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 2973 | */ |
b7058842 | 2974 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 2975 | { |
e89c2095 | 2976 | struct sctp_assoc_value params; |
1da177e4 | 2977 | struct sctp_association *asoc; |
1da177e4 LT |
2978 | struct sctp_sock *sp = sctp_sk(sk); |
2979 | int val; | |
2980 | ||
e89c2095 | 2981 | if (optlen == sizeof(int)) { |
145ce502 JP |
2982 | pr_warn("Use of int in maxseg socket option deprecated\n"); |
2983 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
e89c2095 WY |
2984 | if (copy_from_user(&val, optval, optlen)) |
2985 | return -EFAULT; | |
2986 | params.assoc_id = 0; | |
2987 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2988 | if (copy_from_user(¶ms, optval, optlen)) | |
2989 | return -EFAULT; | |
2990 | val = params.assoc_value; | |
2991 | } else | |
1da177e4 | 2992 | return -EINVAL; |
e89c2095 | 2993 | |
96a33998 | 2994 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 2995 | return -EINVAL; |
1da177e4 | 2996 | |
e89c2095 WY |
2997 | asoc = sctp_id2assoc(sk, params.assoc_id); |
2998 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
2999 | return -EINVAL; | |
3000 | ||
3001 | if (asoc) { | |
3002 | if (val == 0) { | |
3003 | val = asoc->pathmtu; | |
3004 | val -= sp->pf->af->net_header_len; | |
3005 | val -= sizeof(struct sctphdr) + | |
3006 | sizeof(struct sctp_data_chunk); | |
3007 | } | |
f68b2e05 VY |
3008 | asoc->user_frag = val; |
3009 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
3010 | } else { |
3011 | sp->user_frag = val; | |
1da177e4 LT |
3012 | } |
3013 | ||
3014 | return 0; | |
3015 | } | |
3016 | ||
3017 | ||
3018 | /* | |
3019 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
3020 | * | |
3021 | * Requests that the peer mark the enclosed address as the association | |
3022 | * primary. The enclosed address must be one of the association's | |
3023 | * locally bound addresses. The following structure is used to make a | |
3024 | * set primary request: | |
3025 | */ | |
3026 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 3027 | unsigned int optlen) |
1da177e4 | 3028 | { |
e1fc3b14 | 3029 | struct net *net = sock_net(sk); |
1da177e4 | 3030 | struct sctp_sock *sp; |
1da177e4 LT |
3031 | struct sctp_association *asoc = NULL; |
3032 | struct sctp_setpeerprim prim; | |
3033 | struct sctp_chunk *chunk; | |
40a01039 | 3034 | struct sctp_af *af; |
1da177e4 LT |
3035 | int err; |
3036 | ||
3037 | sp = sctp_sk(sk); | |
1da177e4 | 3038 | |
e1fc3b14 | 3039 | if (!net->sctp.addip_enable) |
1da177e4 LT |
3040 | return -EPERM; |
3041 | ||
3042 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
3043 | return -EINVAL; | |
3044 | ||
3045 | if (copy_from_user(&prim, optval, optlen)) | |
3046 | return -EFAULT; | |
3047 | ||
3048 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 3049 | if (!asoc) |
1da177e4 LT |
3050 | return -EINVAL; |
3051 | ||
3052 | if (!asoc->peer.asconf_capable) | |
3053 | return -EPERM; | |
3054 | ||
3055 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
3056 | return -EPERM; | |
3057 | ||
3058 | if (!sctp_state(asoc, ESTABLISHED)) | |
3059 | return -ENOTCONN; | |
3060 | ||
40a01039 WY |
3061 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
3062 | if (!af) | |
3063 | return -EINVAL; | |
3064 | ||
3065 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
3066 | return -EADDRNOTAVAIL; | |
3067 | ||
1da177e4 LT |
3068 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
3069 | return -EADDRNOTAVAIL; | |
3070 | ||
3071 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3072 | chunk = sctp_make_asconf_set_prim(asoc, | |
3073 | (union sctp_addr *)&prim.sspp_addr); | |
3074 | if (!chunk) | |
3075 | return -ENOMEM; | |
3076 | ||
3077 | err = sctp_send_asconf(asoc, chunk); | |
3078 | ||
bb33381d | 3079 | pr_debug("%s: we set peer primary addr primitively\n", __func__); |
1da177e4 LT |
3080 | |
3081 | return err; | |
3082 | } | |
3083 | ||
0f3fffd8 | 3084 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3085 | unsigned int optlen) |
1da177e4 | 3086 | { |
0f3fffd8 | 3087 | struct sctp_setadaptation adaptation; |
1da177e4 | 3088 | |
0f3fffd8 | 3089 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3090 | return -EINVAL; |
0f3fffd8 | 3091 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3092 | return -EFAULT; |
3093 | ||
0f3fffd8 | 3094 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3095 | |
3096 | return 0; | |
3097 | } | |
3098 | ||
6ab792f5 ISJ |
3099 | /* |
3100 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3101 | * | |
3102 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3103 | * used when a failed message is retrieved holding the value that was | |
3104 | * sent down on the actual send call. This option allows the setting of | |
3105 | * a default context on an association basis that will be received on | |
3106 | * reading messages from the peer. This is especially helpful in the | |
3107 | * one-2-many model for an application to keep some reference to an | |
3108 | * internal state machine that is processing messages on the | |
3109 | * association. Note that the setting of this value only effects | |
3110 | * received messages from the peer and does not effect the value that is | |
3111 | * saved with outbound messages. | |
3112 | */ | |
3113 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3114 | unsigned int optlen) |
6ab792f5 ISJ |
3115 | { |
3116 | struct sctp_assoc_value params; | |
3117 | struct sctp_sock *sp; | |
3118 | struct sctp_association *asoc; | |
3119 | ||
3120 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3121 | return -EINVAL; | |
3122 | if (copy_from_user(¶ms, optval, optlen)) | |
3123 | return -EFAULT; | |
3124 | ||
3125 | sp = sctp_sk(sk); | |
3126 | ||
3127 | if (params.assoc_id != 0) { | |
3128 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3129 | if (!asoc) | |
3130 | return -EINVAL; | |
3131 | asoc->default_rcv_context = params.assoc_value; | |
3132 | } else { | |
3133 | sp->default_rcv_context = params.assoc_value; | |
3134 | } | |
3135 | ||
3136 | return 0; | |
3137 | } | |
3138 | ||
b6e1331f VY |
3139 | /* |
3140 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3141 | * | |
3142 | * This options will at a minimum specify if the implementation is doing | |
3143 | * fragmented interleave. Fragmented interleave, for a one to many | |
3144 | * socket, is when subsequent calls to receive a message may return | |
3145 | * parts of messages from different associations. Some implementations | |
3146 | * may allow you to turn this value on or off. If so, when turned off, | |
3147 | * no fragment interleave will occur (which will cause a head of line | |
3148 | * blocking amongst multiple associations sharing the same one to many | |
3149 | * socket). When this option is turned on, then each receive call may | |
3150 | * come from a different association (thus the user must receive data | |
3151 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3152 | * association each receive belongs to. | |
3153 | * | |
3154 | * This option takes a boolean value. A non-zero value indicates that | |
3155 | * fragmented interleave is on. A value of zero indicates that | |
3156 | * fragmented interleave is off. | |
3157 | * | |
3158 | * Note that it is important that an implementation that allows this | |
3159 | * option to be turned on, have it off by default. Otherwise an unaware | |
3160 | * application using the one to many model may become confused and act | |
3161 | * incorrectly. | |
3162 | */ | |
3163 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3164 | char __user *optval, | |
b7058842 | 3165 | unsigned int optlen) |
b6e1331f VY |
3166 | { |
3167 | int val; | |
3168 | ||
3169 | if (optlen != sizeof(int)) | |
3170 | return -EINVAL; | |
3171 | if (get_user(val, (int __user *)optval)) | |
3172 | return -EFAULT; | |
3173 | ||
3174 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3175 | ||
3176 | return 0; | |
3177 | } | |
3178 | ||
d49d91d7 | 3179 | /* |
8510b937 | 3180 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3181 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3182 | * |
d49d91d7 VY |
3183 | * This option will set or get the SCTP partial delivery point. This |
3184 | * point is the size of a message where the partial delivery API will be | |
3185 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3186 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3187 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3188 | * point. Note also that the call will fail if the user attempts to set |
3189 | * this value larger than the socket receive buffer size. | |
3190 | * | |
3191 | * Note that any single message having a length smaller than or equal to | |
3192 | * the SCTP partial delivery point will be delivered in one single read | |
3193 | * call as long as the user provided buffer is large enough to hold the | |
3194 | * message. | |
d49d91d7 VY |
3195 | */ |
3196 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3197 | char __user *optval, | |
b7058842 | 3198 | unsigned int optlen) |
d49d91d7 VY |
3199 | { |
3200 | u32 val; | |
3201 | ||
3202 | if (optlen != sizeof(u32)) | |
3203 | return -EINVAL; | |
3204 | if (get_user(val, (int __user *)optval)) | |
3205 | return -EFAULT; | |
3206 | ||
8510b937 WY |
3207 | /* Note: We double the receive buffer from what the user sets |
3208 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3209 | */ | |
3210 | if (val > (sk->sk_rcvbuf >> 1)) | |
3211 | return -EINVAL; | |
3212 | ||
d49d91d7 VY |
3213 | sctp_sk(sk)->pd_point = val; |
3214 | ||
3215 | return 0; /* is this the right error code? */ | |
3216 | } | |
3217 | ||
70331571 VY |
3218 | /* |
3219 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3220 | * | |
3221 | * This option will allow a user to change the maximum burst of packets | |
3222 | * that can be emitted by this association. Note that the default value | |
3223 | * is 4, and some implementations may restrict this setting so that it | |
3224 | * can only be lowered. | |
3225 | * | |
3226 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3227 | * future associations inheriting the socket value. | |
3228 | */ | |
3229 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3230 | char __user *optval, | |
b7058842 | 3231 | unsigned int optlen) |
70331571 | 3232 | { |
219b99a9 NH |
3233 | struct sctp_assoc_value params; |
3234 | struct sctp_sock *sp; | |
3235 | struct sctp_association *asoc; | |
70331571 | 3236 | int val; |
219b99a9 | 3237 | int assoc_id = 0; |
70331571 | 3238 | |
219b99a9 | 3239 | if (optlen == sizeof(int)) { |
145ce502 JP |
3240 | pr_warn("Use of int in max_burst socket option deprecated\n"); |
3241 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
219b99a9 NH |
3242 | if (copy_from_user(&val, optval, optlen)) |
3243 | return -EFAULT; | |
3244 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3245 | if (copy_from_user(¶ms, optval, optlen)) | |
3246 | return -EFAULT; | |
3247 | val = params.assoc_value; | |
3248 | assoc_id = params.assoc_id; | |
3249 | } else | |
70331571 VY |
3250 | return -EINVAL; |
3251 | ||
219b99a9 NH |
3252 | sp = sctp_sk(sk); |
3253 | ||
3254 | if (assoc_id != 0) { | |
3255 | asoc = sctp_id2assoc(sk, assoc_id); | |
3256 | if (!asoc) | |
3257 | return -EINVAL; | |
3258 | asoc->max_burst = val; | |
3259 | } else | |
3260 | sp->max_burst = val; | |
70331571 VY |
3261 | |
3262 | return 0; | |
3263 | } | |
3264 | ||
65b07e5d VY |
3265 | /* |
3266 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3267 | * | |
3268 | * This set option adds a chunk type that the user is requesting to be | |
3269 | * received only in an authenticated way. Changes to the list of chunks | |
3270 | * will only effect future associations on the socket. | |
3271 | */ | |
3272 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3273 | char __user *optval, |
3274 | unsigned int optlen) | |
65b07e5d | 3275 | { |
e1fc3b14 | 3276 | struct net *net = sock_net(sk); |
65b07e5d VY |
3277 | struct sctp_authchunk val; |
3278 | ||
e1fc3b14 | 3279 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3280 | return -EACCES; |
3281 | ||
65b07e5d VY |
3282 | if (optlen != sizeof(struct sctp_authchunk)) |
3283 | return -EINVAL; | |
3284 | if (copy_from_user(&val, optval, optlen)) | |
3285 | return -EFAULT; | |
3286 | ||
3287 | switch (val.sauth_chunk) { | |
7fd71b1e JP |
3288 | case SCTP_CID_INIT: |
3289 | case SCTP_CID_INIT_ACK: | |
3290 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3291 | case SCTP_CID_AUTH: | |
3292 | return -EINVAL; | |
65b07e5d VY |
3293 | } |
3294 | ||
3295 | /* add this chunk id to the endpoint */ | |
3296 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3297 | } | |
3298 | ||
3299 | /* | |
3300 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3301 | * | |
3302 | * This option gets or sets the list of HMAC algorithms that the local | |
3303 | * endpoint requires the peer to use. | |
3304 | */ | |
3305 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3306 | char __user *optval, |
3307 | unsigned int optlen) | |
65b07e5d | 3308 | { |
e1fc3b14 | 3309 | struct net *net = sock_net(sk); |
65b07e5d | 3310 | struct sctp_hmacalgo *hmacs; |
d9724055 | 3311 | u32 idents; |
65b07e5d VY |
3312 | int err; |
3313 | ||
e1fc3b14 | 3314 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3315 | return -EACCES; |
3316 | ||
65b07e5d VY |
3317 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3318 | return -EINVAL; | |
3319 | ||
934253a7 SW |
3320 | hmacs= memdup_user(optval, optlen); |
3321 | if (IS_ERR(hmacs)) | |
3322 | return PTR_ERR(hmacs); | |
65b07e5d | 3323 | |
d9724055 VY |
3324 | idents = hmacs->shmac_num_idents; |
3325 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3326 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3327 | err = -EINVAL; |
3328 | goto out; | |
3329 | } | |
3330 | ||
3331 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3332 | out: | |
3333 | kfree(hmacs); | |
3334 | return err; | |
3335 | } | |
3336 | ||
3337 | /* | |
3338 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3339 | * | |
3340 | * This option will set a shared secret key which is used to build an | |
3341 | * association shared key. | |
3342 | */ | |
3343 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3344 | char __user *optval, | |
b7058842 | 3345 | unsigned int optlen) |
65b07e5d | 3346 | { |
e1fc3b14 | 3347 | struct net *net = sock_net(sk); |
65b07e5d VY |
3348 | struct sctp_authkey *authkey; |
3349 | struct sctp_association *asoc; | |
3350 | int ret; | |
3351 | ||
e1fc3b14 | 3352 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3353 | return -EACCES; |
3354 | ||
65b07e5d VY |
3355 | if (optlen <= sizeof(struct sctp_authkey)) |
3356 | return -EINVAL; | |
3357 | ||
934253a7 SW |
3358 | authkey= memdup_user(optval, optlen); |
3359 | if (IS_ERR(authkey)) | |
3360 | return PTR_ERR(authkey); | |
65b07e5d | 3361 | |
328fc47e | 3362 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3363 | ret = -EINVAL; |
3364 | goto out; | |
3365 | } | |
3366 | ||
65b07e5d VY |
3367 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3368 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3369 | ret = -EINVAL; | |
3370 | goto out; | |
3371 | } | |
3372 | ||
3373 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3374 | out: | |
6ba542a2 | 3375 | kzfree(authkey); |
65b07e5d VY |
3376 | return ret; |
3377 | } | |
3378 | ||
3379 | /* | |
3380 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3381 | * | |
3382 | * This option will get or set the active shared key to be used to build | |
3383 | * the association shared key. | |
3384 | */ | |
3385 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3386 | char __user *optval, |
3387 | unsigned int optlen) | |
65b07e5d | 3388 | { |
e1fc3b14 | 3389 | struct net *net = sock_net(sk); |
65b07e5d VY |
3390 | struct sctp_authkeyid val; |
3391 | struct sctp_association *asoc; | |
3392 | ||
e1fc3b14 | 3393 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3394 | return -EACCES; |
3395 | ||
65b07e5d VY |
3396 | if (optlen != sizeof(struct sctp_authkeyid)) |
3397 | return -EINVAL; | |
3398 | if (copy_from_user(&val, optval, optlen)) | |
3399 | return -EFAULT; | |
3400 | ||
3401 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3402 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3403 | return -EINVAL; | |
3404 | ||
3405 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3406 | val.scact_keynumber); | |
3407 | } | |
3408 | ||
3409 | /* | |
3410 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3411 | * | |
3412 | * This set option will delete a shared secret key from use. | |
3413 | */ | |
3414 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3415 | char __user *optval, |
3416 | unsigned int optlen) | |
65b07e5d | 3417 | { |
e1fc3b14 | 3418 | struct net *net = sock_net(sk); |
65b07e5d VY |
3419 | struct sctp_authkeyid val; |
3420 | struct sctp_association *asoc; | |
3421 | ||
e1fc3b14 | 3422 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3423 | return -EACCES; |
3424 | ||
65b07e5d VY |
3425 | if (optlen != sizeof(struct sctp_authkeyid)) |
3426 | return -EINVAL; | |
3427 | if (copy_from_user(&val, optval, optlen)) | |
3428 | return -EFAULT; | |
3429 | ||
3430 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3431 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3432 | return -EINVAL; | |
3433 | ||
3434 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3435 | val.scact_keynumber); | |
3436 | ||
3437 | } | |
3438 | ||
7dc04d71 MH |
3439 | /* |
3440 | * 8.1.23 SCTP_AUTO_ASCONF | |
3441 | * | |
3442 | * This option will enable or disable the use of the automatic generation of | |
3443 | * ASCONF chunks to add and delete addresses to an existing association. Note | |
3444 | * that this option has two caveats namely: a) it only affects sockets that | |
3445 | * are bound to all addresses available to the SCTP stack, and b) the system | |
3446 | * administrator may have an overriding control that turns the ASCONF feature | |
3447 | * off no matter what setting the socket option may have. | |
3448 | * This option expects an integer boolean flag, where a non-zero value turns on | |
3449 | * the option, and a zero value turns off the option. | |
3450 | * Note. In this implementation, socket operation overrides default parameter | |
3451 | * being set by sysctl as well as FreeBSD implementation | |
3452 | */ | |
3453 | static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval, | |
3454 | unsigned int optlen) | |
3455 | { | |
3456 | int val; | |
3457 | struct sctp_sock *sp = sctp_sk(sk); | |
3458 | ||
3459 | if (optlen < sizeof(int)) | |
3460 | return -EINVAL; | |
3461 | if (get_user(val, (int __user *)optval)) | |
3462 | return -EFAULT; | |
3463 | if (!sctp_is_ep_boundall(sk) && val) | |
3464 | return -EINVAL; | |
3465 | if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf)) | |
3466 | return 0; | |
3467 | ||
3468 | if (val == 0 && sp->do_auto_asconf) { | |
3469 | list_del(&sp->auto_asconf_list); | |
3470 | sp->do_auto_asconf = 0; | |
3471 | } else if (val && !sp->do_auto_asconf) { | |
3472 | list_add_tail(&sp->auto_asconf_list, | |
4db67e80 | 3473 | &sock_net(sk)->sctp.auto_asconf_splist); |
7dc04d71 MH |
3474 | sp->do_auto_asconf = 1; |
3475 | } | |
3476 | return 0; | |
3477 | } | |
3478 | ||
65b07e5d | 3479 | |
5aa93bcf NH |
3480 | /* |
3481 | * SCTP_PEER_ADDR_THLDS | |
3482 | * | |
3483 | * This option allows us to alter the partially failed threshold for one or all | |
3484 | * transports in an association. See Section 6.1 of: | |
3485 | * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt | |
3486 | */ | |
3487 | static int sctp_setsockopt_paddr_thresholds(struct sock *sk, | |
3488 | char __user *optval, | |
3489 | unsigned int optlen) | |
3490 | { | |
3491 | struct sctp_paddrthlds val; | |
3492 | struct sctp_transport *trans; | |
3493 | struct sctp_association *asoc; | |
3494 | ||
3495 | if (optlen < sizeof(struct sctp_paddrthlds)) | |
3496 | return -EINVAL; | |
3497 | if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, | |
3498 | sizeof(struct sctp_paddrthlds))) | |
3499 | return -EFAULT; | |
3500 | ||
3501 | ||
3502 | if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) { | |
3503 | asoc = sctp_id2assoc(sk, val.spt_assoc_id); | |
3504 | if (!asoc) | |
3505 | return -ENOENT; | |
3506 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
3507 | transports) { | |
3508 | if (val.spt_pathmaxrxt) | |
3509 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3510 | trans->pf_retrans = val.spt_pathpfthld; | |
3511 | } | |
3512 | ||
3513 | if (val.spt_pathmaxrxt) | |
3514 | asoc->pathmaxrxt = val.spt_pathmaxrxt; | |
3515 | asoc->pf_retrans = val.spt_pathpfthld; | |
3516 | } else { | |
3517 | trans = sctp_addr_id2transport(sk, &val.spt_address, | |
3518 | val.spt_assoc_id); | |
3519 | if (!trans) | |
3520 | return -ENOENT; | |
3521 | ||
3522 | if (val.spt_pathmaxrxt) | |
3523 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3524 | trans->pf_retrans = val.spt_pathpfthld; | |
3525 | } | |
3526 | ||
3527 | return 0; | |
3528 | } | |
3529 | ||
1da177e4 LT |
3530 | /* API 6.2 setsockopt(), getsockopt() |
3531 | * | |
3532 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3533 | * socket options. Socket options are used to change the default | |
3534 | * behavior of sockets calls. They are described in Section 7. | |
3535 | * | |
3536 | * The syntax is: | |
3537 | * | |
3538 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3539 | * int __user *optlen); | |
3540 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3541 | * int optlen); | |
3542 | * | |
3543 | * sd - the socket descript. | |
3544 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3545 | * optname - the option name. | |
3546 | * optval - the buffer to store the value of the option. | |
3547 | * optlen - the size of the buffer. | |
3548 | */ | |
dda91928 DB |
3549 | static int sctp_setsockopt(struct sock *sk, int level, int optname, |
3550 | char __user *optval, unsigned int optlen) | |
1da177e4 LT |
3551 | { |
3552 | int retval = 0; | |
3553 | ||
bb33381d | 3554 | pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname); |
1da177e4 LT |
3555 | |
3556 | /* I can hardly begin to describe how wrong this is. This is | |
3557 | * so broken as to be worse than useless. The API draft | |
3558 | * REALLY is NOT helpful here... I am not convinced that the | |
3559 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3560 | * are at all well-founded. | |
3561 | */ | |
3562 | if (level != SOL_SCTP) { | |
3563 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3564 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3565 | goto out_nounlock; | |
3566 | } | |
3567 | ||
3568 | sctp_lock_sock(sk); | |
3569 | ||
3570 | switch (optname) { | |
3571 | case SCTP_SOCKOPT_BINDX_ADD: | |
3572 | /* 'optlen' is the size of the addresses buffer. */ | |
3573 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3574 | optlen, SCTP_BINDX_ADD_ADDR); | |
3575 | break; | |
3576 | ||
3577 | case SCTP_SOCKOPT_BINDX_REM: | |
3578 | /* 'optlen' is the size of the addresses buffer. */ | |
3579 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3580 | optlen, SCTP_BINDX_REM_ADDR); | |
3581 | break; | |
3582 | ||
88a0a948 VY |
3583 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3584 | /* 'optlen' is the size of the addresses buffer. */ | |
3585 | retval = sctp_setsockopt_connectx_old(sk, | |
3586 | (struct sockaddr __user *)optval, | |
3587 | optlen); | |
3588 | break; | |
3589 | ||
3f7a87d2 FF |
3590 | case SCTP_SOCKOPT_CONNECTX: |
3591 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3592 | retval = sctp_setsockopt_connectx(sk, |
3593 | (struct sockaddr __user *)optval, | |
3594 | optlen); | |
3f7a87d2 FF |
3595 | break; |
3596 | ||
1da177e4 LT |
3597 | case SCTP_DISABLE_FRAGMENTS: |
3598 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3599 | break; | |
3600 | ||
3601 | case SCTP_EVENTS: | |
3602 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3603 | break; | |
3604 | ||
3605 | case SCTP_AUTOCLOSE: | |
3606 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3607 | break; | |
3608 | ||
3609 | case SCTP_PEER_ADDR_PARAMS: | |
3610 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3611 | break; | |
3612 | ||
4580ccc0 | 3613 | case SCTP_DELAYED_SACK: |
d364d927 | 3614 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3615 | break; |
d49d91d7 VY |
3616 | case SCTP_PARTIAL_DELIVERY_POINT: |
3617 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3618 | break; | |
7708610b | 3619 | |
1da177e4 LT |
3620 | case SCTP_INITMSG: |
3621 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3622 | break; | |
3623 | case SCTP_DEFAULT_SEND_PARAM: | |
3624 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3625 | optlen); | |
3626 | break; | |
3627 | case SCTP_PRIMARY_ADDR: | |
3628 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3629 | break; | |
3630 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3631 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3632 | break; | |
3633 | case SCTP_NODELAY: | |
3634 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3635 | break; | |
3636 | case SCTP_RTOINFO: | |
3637 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3638 | break; | |
3639 | case SCTP_ASSOCINFO: | |
3640 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3641 | break; | |
3642 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3643 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3644 | break; | |
3645 | case SCTP_MAXSEG: | |
3646 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3647 | break; | |
0f3fffd8 ISJ |
3648 | case SCTP_ADAPTATION_LAYER: |
3649 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3650 | break; |
6ab792f5 ISJ |
3651 | case SCTP_CONTEXT: |
3652 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3653 | break; | |
b6e1331f VY |
3654 | case SCTP_FRAGMENT_INTERLEAVE: |
3655 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3656 | break; | |
70331571 VY |
3657 | case SCTP_MAX_BURST: |
3658 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3659 | break; | |
65b07e5d VY |
3660 | case SCTP_AUTH_CHUNK: |
3661 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3662 | break; | |
3663 | case SCTP_HMAC_IDENT: | |
3664 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3665 | break; | |
3666 | case SCTP_AUTH_KEY: | |
3667 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3668 | break; | |
3669 | case SCTP_AUTH_ACTIVE_KEY: | |
3670 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3671 | break; | |
3672 | case SCTP_AUTH_DELETE_KEY: | |
3673 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3674 | break; | |
7dc04d71 MH |
3675 | case SCTP_AUTO_ASCONF: |
3676 | retval = sctp_setsockopt_auto_asconf(sk, optval, optlen); | |
3677 | break; | |
5aa93bcf NH |
3678 | case SCTP_PEER_ADDR_THLDS: |
3679 | retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen); | |
3680 | break; | |
1da177e4 LT |
3681 | default: |
3682 | retval = -ENOPROTOOPT; | |
3683 | break; | |
3ff50b79 | 3684 | } |
1da177e4 LT |
3685 | |
3686 | sctp_release_sock(sk); | |
3687 | ||
3688 | out_nounlock: | |
3689 | return retval; | |
3690 | } | |
3691 | ||
3692 | /* API 3.1.6 connect() - UDP Style Syntax | |
3693 | * | |
3694 | * An application may use the connect() call in the UDP model to initiate an | |
3695 | * association without sending data. | |
3696 | * | |
3697 | * The syntax is: | |
3698 | * | |
3699 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3700 | * | |
3701 | * sd: the socket descriptor to have a new association added to. | |
3702 | * | |
3703 | * nam: the address structure (either struct sockaddr_in or struct | |
3704 | * sockaddr_in6 defined in RFC2553 [7]). | |
3705 | * | |
3706 | * len: the size of the address. | |
3707 | */ | |
dda91928 DB |
3708 | static int sctp_connect(struct sock *sk, struct sockaddr *addr, |
3709 | int addr_len) | |
1da177e4 | 3710 | { |
1da177e4 | 3711 | int err = 0; |
3f7a87d2 | 3712 | struct sctp_af *af; |
1da177e4 LT |
3713 | |
3714 | sctp_lock_sock(sk); | |
3715 | ||
bb33381d DB |
3716 | pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk, |
3717 | addr, addr_len); | |
1da177e4 | 3718 | |
3f7a87d2 FF |
3719 | /* Validate addr_len before calling common connect/connectx routine. */ |
3720 | af = sctp_get_af_specific(addr->sa_family); | |
3721 | if (!af || addr_len < af->sockaddr_len) { | |
3722 | err = -EINVAL; | |
3723 | } else { | |
3724 | /* Pass correct addr len to common routine (so it knows there | |
3725 | * is only one address being passed. | |
3726 | */ | |
88a0a948 | 3727 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3728 | } |
3729 | ||
1da177e4 | 3730 | sctp_release_sock(sk); |
1da177e4 LT |
3731 | return err; |
3732 | } | |
3733 | ||
3734 | /* FIXME: Write comments. */ | |
dda91928 | 3735 | static int sctp_disconnect(struct sock *sk, int flags) |
1da177e4 LT |
3736 | { |
3737 | return -EOPNOTSUPP; /* STUB */ | |
3738 | } | |
3739 | ||
3740 | /* 4.1.4 accept() - TCP Style Syntax | |
3741 | * | |
3742 | * Applications use accept() call to remove an established SCTP | |
3743 | * association from the accept queue of the endpoint. A new socket | |
3744 | * descriptor will be returned from accept() to represent the newly | |
3745 | * formed association. | |
3746 | */ | |
dda91928 | 3747 | static struct sock *sctp_accept(struct sock *sk, int flags, int *err) |
1da177e4 LT |
3748 | { |
3749 | struct sctp_sock *sp; | |
3750 | struct sctp_endpoint *ep; | |
3751 | struct sock *newsk = NULL; | |
3752 | struct sctp_association *asoc; | |
3753 | long timeo; | |
3754 | int error = 0; | |
3755 | ||
3756 | sctp_lock_sock(sk); | |
3757 | ||
3758 | sp = sctp_sk(sk); | |
3759 | ep = sp->ep; | |
3760 | ||
3761 | if (!sctp_style(sk, TCP)) { | |
3762 | error = -EOPNOTSUPP; | |
3763 | goto out; | |
3764 | } | |
3765 | ||
3766 | if (!sctp_sstate(sk, LISTENING)) { | |
3767 | error = -EINVAL; | |
3768 | goto out; | |
3769 | } | |
3770 | ||
8abfedd8 | 3771 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3772 | |
3773 | error = sctp_wait_for_accept(sk, timeo); | |
3774 | if (error) | |
3775 | goto out; | |
3776 | ||
3777 | /* We treat the list of associations on the endpoint as the accept | |
3778 | * queue and pick the first association on the list. | |
3779 | */ | |
3780 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3781 | ||
3782 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3783 | if (!newsk) { | |
3784 | error = -ENOMEM; | |
3785 | goto out; | |
3786 | } | |
3787 | ||
3788 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3789 | * asoc to the newsk. | |
3790 | */ | |
3791 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3792 | ||
3793 | out: | |
3794 | sctp_release_sock(sk); | |
d808ad9a | 3795 | *err = error; |
1da177e4 LT |
3796 | return newsk; |
3797 | } | |
3798 | ||
3799 | /* The SCTP ioctl handler. */ | |
dda91928 | 3800 | static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1da177e4 | 3801 | { |
65040c33 DEFP |
3802 | int rc = -ENOTCONN; |
3803 | ||
3804 | sctp_lock_sock(sk); | |
3805 | ||
3806 | /* | |
3807 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3808 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3809 | */ | |
3810 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3811 | goto out; | |
3812 | ||
3813 | switch (cmd) { | |
3814 | case SIOCINQ: { | |
3815 | struct sk_buff *skb; | |
3816 | unsigned int amount = 0; | |
3817 | ||
3818 | skb = skb_peek(&sk->sk_receive_queue); | |
3819 | if (skb != NULL) { | |
3820 | /* | |
3821 | * We will only return the amount of this packet since | |
3822 | * that is all that will be read. | |
3823 | */ | |
3824 | amount = skb->len; | |
3825 | } | |
3826 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3827 | break; |
9a7241c2 | 3828 | } |
65040c33 DEFP |
3829 | default: |
3830 | rc = -ENOIOCTLCMD; | |
3831 | break; | |
3832 | } | |
3833 | out: | |
3834 | sctp_release_sock(sk); | |
3835 | return rc; | |
1da177e4 LT |
3836 | } |
3837 | ||
3838 | /* This is the function which gets called during socket creation to | |
3839 | * initialized the SCTP-specific portion of the sock. | |
3840 | * The sock structure should already be zero-filled memory. | |
3841 | */ | |
dda91928 | 3842 | static int sctp_init_sock(struct sock *sk) |
1da177e4 | 3843 | { |
e1fc3b14 | 3844 | struct net *net = sock_net(sk); |
1da177e4 LT |
3845 | struct sctp_sock *sp; |
3846 | ||
bb33381d | 3847 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
3848 | |
3849 | sp = sctp_sk(sk); | |
3850 | ||
3851 | /* Initialize the SCTP per socket area. */ | |
3852 | switch (sk->sk_type) { | |
3853 | case SOCK_SEQPACKET: | |
3854 | sp->type = SCTP_SOCKET_UDP; | |
3855 | break; | |
3856 | case SOCK_STREAM: | |
3857 | sp->type = SCTP_SOCKET_TCP; | |
3858 | break; | |
3859 | default: | |
3860 | return -ESOCKTNOSUPPORT; | |
3861 | } | |
3862 | ||
3863 | /* Initialize default send parameters. These parameters can be | |
3864 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3865 | */ | |
3866 | sp->default_stream = 0; | |
3867 | sp->default_ppid = 0; | |
3868 | sp->default_flags = 0; | |
3869 | sp->default_context = 0; | |
3870 | sp->default_timetolive = 0; | |
3871 | ||
6ab792f5 | 3872 | sp->default_rcv_context = 0; |
e1fc3b14 | 3873 | sp->max_burst = net->sctp.max_burst; |
6ab792f5 | 3874 | |
3c68198e NH |
3875 | sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg; |
3876 | ||
1da177e4 LT |
3877 | /* Initialize default setup parameters. These parameters |
3878 | * can be modified with the SCTP_INITMSG socket option or | |
3879 | * overridden by the SCTP_INIT CMSG. | |
3880 | */ | |
3881 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3882 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
e1fc3b14 EB |
3883 | sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init; |
3884 | sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max; | |
1da177e4 LT |
3885 | |
3886 | /* Initialize default RTO related parameters. These parameters can | |
3887 | * be modified for with the SCTP_RTOINFO socket option. | |
3888 | */ | |
e1fc3b14 EB |
3889 | sp->rtoinfo.srto_initial = net->sctp.rto_initial; |
3890 | sp->rtoinfo.srto_max = net->sctp.rto_max; | |
3891 | sp->rtoinfo.srto_min = net->sctp.rto_min; | |
1da177e4 LT |
3892 | |
3893 | /* Initialize default association related parameters. These parameters | |
3894 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3895 | */ | |
e1fc3b14 | 3896 | sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association; |
1da177e4 LT |
3897 | sp->assocparams.sasoc_number_peer_destinations = 0; |
3898 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3899 | sp->assocparams.sasoc_local_rwnd = 0; | |
e1fc3b14 | 3900 | sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life; |
1da177e4 LT |
3901 | |
3902 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 3903 | * options are off. |
1da177e4 LT |
3904 | */ |
3905 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3906 | ||
3907 | /* Default Peer Address Parameters. These defaults can | |
3908 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3909 | */ | |
e1fc3b14 EB |
3910 | sp->hbinterval = net->sctp.hb_interval; |
3911 | sp->pathmaxrxt = net->sctp.max_retrans_path; | |
52ccb8e9 | 3912 | sp->pathmtu = 0; // allow default discovery |
e1fc3b14 | 3913 | sp->sackdelay = net->sctp.sack_timeout; |
7bfe8bdb | 3914 | sp->sackfreq = 2; |
52ccb8e9 | 3915 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
3916 | SPP_PMTUD_ENABLE | |
3917 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
3918 | |
3919 | /* If enabled no SCTP message fragmentation will be performed. | |
3920 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3921 | */ | |
3922 | sp->disable_fragments = 0; | |
3923 | ||
208edef6 SS |
3924 | /* Enable Nagle algorithm by default. */ |
3925 | sp->nodelay = 0; | |
1da177e4 LT |
3926 | |
3927 | /* Enable by default. */ | |
3928 | sp->v4mapped = 1; | |
3929 | ||
3930 | /* Auto-close idle associations after the configured | |
3931 | * number of seconds. A value of 0 disables this | |
3932 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3933 | * for UDP-style sockets only. | |
3934 | */ | |
3935 | sp->autoclose = 0; | |
3936 | ||
3937 | /* User specified fragmentation limit. */ | |
3938 | sp->user_frag = 0; | |
3939 | ||
0f3fffd8 | 3940 | sp->adaptation_ind = 0; |
1da177e4 LT |
3941 | |
3942 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3943 | ||
3944 | /* Control variables for partial data delivery. */ | |
b6e1331f | 3945 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 3946 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 3947 | sp->frag_interleave = 0; |
1da177e4 LT |
3948 | |
3949 | /* Create a per socket endpoint structure. Even if we | |
3950 | * change the data structure relationships, this may still | |
3951 | * be useful for storing pre-connect address information. | |
3952 | */ | |
c164b838 DB |
3953 | sp->ep = sctp_endpoint_new(sk, GFP_KERNEL); |
3954 | if (!sp->ep) | |
1da177e4 LT |
3955 | return -ENOMEM; |
3956 | ||
1da177e4 LT |
3957 | sp->hmac = NULL; |
3958 | ||
0a2fbac1 DB |
3959 | sk->sk_destruct = sctp_destruct_sock; |
3960 | ||
1da177e4 | 3961 | SCTP_DBG_OBJCNT_INC(sock); |
6f756a8c DM |
3962 | |
3963 | local_bh_disable(); | |
81419d86 | 3964 | percpu_counter_inc(&sctp_sockets_allocated); |
e1fc3b14 EB |
3965 | sock_prot_inuse_add(net, sk->sk_prot, 1); |
3966 | if (net->sctp.default_auto_asconf) { | |
9f7d653b | 3967 | list_add_tail(&sp->auto_asconf_list, |
e1fc3b14 | 3968 | &net->sctp.auto_asconf_splist); |
9f7d653b MH |
3969 | sp->do_auto_asconf = 1; |
3970 | } else | |
3971 | sp->do_auto_asconf = 0; | |
6f756a8c DM |
3972 | local_bh_enable(); |
3973 | ||
1da177e4 LT |
3974 | return 0; |
3975 | } | |
3976 | ||
3977 | /* Cleanup any SCTP per socket resources. */ | |
dda91928 | 3978 | static void sctp_destroy_sock(struct sock *sk) |
1da177e4 | 3979 | { |
9f7d653b | 3980 | struct sctp_sock *sp; |
1da177e4 | 3981 | |
bb33381d | 3982 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
3983 | |
3984 | /* Release our hold on the endpoint. */ | |
9f7d653b | 3985 | sp = sctp_sk(sk); |
1abd165e DB |
3986 | /* This could happen during socket init, thus we bail out |
3987 | * early, since the rest of the below is not setup either. | |
3988 | */ | |
3989 | if (sp->ep == NULL) | |
3990 | return; | |
3991 | ||
9f7d653b MH |
3992 | if (sp->do_auto_asconf) { |
3993 | sp->do_auto_asconf = 0; | |
3994 | list_del(&sp->auto_asconf_list); | |
3995 | } | |
3996 | sctp_endpoint_free(sp->ep); | |
5bc0b3bf | 3997 | local_bh_disable(); |
81419d86 | 3998 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 3999 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 4000 | local_bh_enable(); |
1da177e4 LT |
4001 | } |
4002 | ||
0a2fbac1 DB |
4003 | /* Triggered when there are no references on the socket anymore */ |
4004 | static void sctp_destruct_sock(struct sock *sk) | |
4005 | { | |
4006 | struct sctp_sock *sp = sctp_sk(sk); | |
4007 | ||
4008 | /* Free up the HMAC transform. */ | |
4009 | crypto_free_hash(sp->hmac); | |
4010 | ||
4011 | inet_sock_destruct(sk); | |
4012 | } | |
4013 | ||
1da177e4 LT |
4014 | /* API 4.1.7 shutdown() - TCP Style Syntax |
4015 | * int shutdown(int socket, int how); | |
4016 | * | |
4017 | * sd - the socket descriptor of the association to be closed. | |
4018 | * how - Specifies the type of shutdown. The values are | |
4019 | * as follows: | |
4020 | * SHUT_RD | |
4021 | * Disables further receive operations. No SCTP | |
4022 | * protocol action is taken. | |
4023 | * SHUT_WR | |
4024 | * Disables further send operations, and initiates | |
4025 | * the SCTP shutdown sequence. | |
4026 | * SHUT_RDWR | |
4027 | * Disables further send and receive operations | |
4028 | * and initiates the SCTP shutdown sequence. | |
4029 | */ | |
dda91928 | 4030 | static void sctp_shutdown(struct sock *sk, int how) |
1da177e4 | 4031 | { |
55e26eb9 | 4032 | struct net *net = sock_net(sk); |
1da177e4 LT |
4033 | struct sctp_endpoint *ep; |
4034 | struct sctp_association *asoc; | |
4035 | ||
4036 | if (!sctp_style(sk, TCP)) | |
4037 | return; | |
4038 | ||
4039 | if (how & SEND_SHUTDOWN) { | |
4040 | ep = sctp_sk(sk)->ep; | |
4041 | if (!list_empty(&ep->asocs)) { | |
4042 | asoc = list_entry(ep->asocs.next, | |
4043 | struct sctp_association, asocs); | |
55e26eb9 | 4044 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
4045 | } |
4046 | } | |
4047 | } | |
4048 | ||
4049 | /* 7.2.1 Association Status (SCTP_STATUS) | |
4050 | ||
4051 | * Applications can retrieve current status information about an | |
4052 | * association, including association state, peer receiver window size, | |
4053 | * number of unacked data chunks, and number of data chunks pending | |
4054 | * receipt. This information is read-only. | |
4055 | */ | |
4056 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
4057 | char __user *optval, | |
4058 | int __user *optlen) | |
4059 | { | |
4060 | struct sctp_status status; | |
4061 | struct sctp_association *asoc = NULL; | |
4062 | struct sctp_transport *transport; | |
4063 | sctp_assoc_t associd; | |
4064 | int retval = 0; | |
4065 | ||
408f22e8 | 4066 | if (len < sizeof(status)) { |
1da177e4 LT |
4067 | retval = -EINVAL; |
4068 | goto out; | |
4069 | } | |
4070 | ||
408f22e8 NH |
4071 | len = sizeof(status); |
4072 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
4073 | retval = -EFAULT; |
4074 | goto out; | |
4075 | } | |
4076 | ||
4077 | associd = status.sstat_assoc_id; | |
4078 | asoc = sctp_id2assoc(sk, associd); | |
4079 | if (!asoc) { | |
4080 | retval = -EINVAL; | |
4081 | goto out; | |
4082 | } | |
4083 | ||
4084 | transport = asoc->peer.primary_path; | |
4085 | ||
4086 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
4087 | status.sstat_state = asoc->state; | |
4088 | status.sstat_rwnd = asoc->peer.rwnd; | |
4089 | status.sstat_unackdata = asoc->unack_data; | |
4090 | ||
4091 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
4092 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
4093 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
4094 | status.sstat_fragmentation_point = asoc->frag_point; | |
4095 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
4096 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
4097 | transport->af_specific->sockaddr_len); | |
1da177e4 LT |
4098 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
4099 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
4100 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3f7a87d2 | 4101 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
4102 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
4103 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
4104 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4105 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4106 | |
3f7a87d2 FF |
4107 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
4108 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
4109 | ||
1da177e4 LT |
4110 | if (put_user(len, optlen)) { |
4111 | retval = -EFAULT; | |
4112 | goto out; | |
4113 | } | |
4114 | ||
bb33381d DB |
4115 | pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n", |
4116 | __func__, len, status.sstat_state, status.sstat_rwnd, | |
4117 | status.sstat_assoc_id); | |
1da177e4 LT |
4118 | |
4119 | if (copy_to_user(optval, &status, len)) { | |
4120 | retval = -EFAULT; | |
4121 | goto out; | |
4122 | } | |
4123 | ||
4124 | out: | |
a02cec21 | 4125 | return retval; |
1da177e4 LT |
4126 | } |
4127 | ||
4128 | ||
4129 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
4130 | * | |
4131 | * Applications can retrieve information about a specific peer address | |
4132 | * of an association, including its reachability state, congestion | |
4133 | * window, and retransmission timer values. This information is | |
4134 | * read-only. | |
4135 | */ | |
4136 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
4137 | char __user *optval, | |
4138 | int __user *optlen) | |
4139 | { | |
4140 | struct sctp_paddrinfo pinfo; | |
4141 | struct sctp_transport *transport; | |
4142 | int retval = 0; | |
4143 | ||
408f22e8 | 4144 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
4145 | retval = -EINVAL; |
4146 | goto out; | |
4147 | } | |
4148 | ||
408f22e8 NH |
4149 | len = sizeof(pinfo); |
4150 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
4151 | retval = -EFAULT; |
4152 | goto out; | |
4153 | } | |
4154 | ||
4155 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
4156 | pinfo.spinfo_assoc_id); | |
4157 | if (!transport) | |
4158 | return -EINVAL; | |
4159 | ||
4160 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 4161 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
4162 | pinfo.spinfo_cwnd = transport->cwnd; |
4163 | pinfo.spinfo_srtt = transport->srtt; | |
4164 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4165 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4166 | |
3f7a87d2 FF |
4167 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
4168 | pinfo.spinfo_state = SCTP_ACTIVE; | |
4169 | ||
1da177e4 LT |
4170 | if (put_user(len, optlen)) { |
4171 | retval = -EFAULT; | |
4172 | goto out; | |
4173 | } | |
4174 | ||
4175 | if (copy_to_user(optval, &pinfo, len)) { | |
4176 | retval = -EFAULT; | |
4177 | goto out; | |
4178 | } | |
4179 | ||
4180 | out: | |
a02cec21 | 4181 | return retval; |
1da177e4 LT |
4182 | } |
4183 | ||
4184 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
4185 | * | |
4186 | * This option is a on/off flag. If enabled no SCTP message | |
4187 | * fragmentation will be performed. Instead if a message being sent | |
4188 | * exceeds the current PMTU size, the message will NOT be sent and | |
4189 | * instead a error will be indicated to the user. | |
4190 | */ | |
4191 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
4192 | char __user *optval, int __user *optlen) | |
4193 | { | |
4194 | int val; | |
4195 | ||
4196 | if (len < sizeof(int)) | |
4197 | return -EINVAL; | |
4198 | ||
4199 | len = sizeof(int); | |
4200 | val = (sctp_sk(sk)->disable_fragments == 1); | |
4201 | if (put_user(len, optlen)) | |
4202 | return -EFAULT; | |
4203 | if (copy_to_user(optval, &val, len)) | |
4204 | return -EFAULT; | |
4205 | return 0; | |
4206 | } | |
4207 | ||
4208 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4209 | * | |
4210 | * This socket option is used to specify various notifications and | |
4211 | * ancillary data the user wishes to receive. | |
4212 | */ | |
4213 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4214 | int __user *optlen) | |
4215 | { | |
acdd5985 | 4216 | if (len <= 0) |
1da177e4 | 4217 | return -EINVAL; |
acdd5985 TG |
4218 | if (len > sizeof(struct sctp_event_subscribe)) |
4219 | len = sizeof(struct sctp_event_subscribe); | |
408f22e8 NH |
4220 | if (put_user(len, optlen)) |
4221 | return -EFAULT; | |
1da177e4 LT |
4222 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4223 | return -EFAULT; | |
4224 | return 0; | |
4225 | } | |
4226 | ||
4227 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4228 | * | |
4229 | * This socket option is applicable to the UDP-style socket only. When | |
4230 | * set it will cause associations that are idle for more than the | |
4231 | * specified number of seconds to automatically close. An association | |
4232 | * being idle is defined an association that has NOT sent or received | |
4233 | * user data. The special value of '0' indicates that no automatic | |
4234 | * close of any associations should be performed. The option expects an | |
4235 | * integer defining the number of seconds of idle time before an | |
4236 | * association is closed. | |
4237 | */ | |
4238 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4239 | { | |
4240 | /* Applicable to UDP-style socket only */ | |
4241 | if (sctp_style(sk, TCP)) | |
4242 | return -EOPNOTSUPP; | |
408f22e8 | 4243 | if (len < sizeof(int)) |
1da177e4 | 4244 | return -EINVAL; |
408f22e8 NH |
4245 | len = sizeof(int); |
4246 | if (put_user(len, optlen)) | |
4247 | return -EFAULT; | |
4248 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4249 | return -EFAULT; |
4250 | return 0; | |
4251 | } | |
4252 | ||
4253 | /* Helper routine to branch off an association to a new socket. */ | |
0343c554 | 4254 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp) |
1da177e4 | 4255 | { |
0343c554 | 4256 | struct sctp_association *asoc = sctp_id2assoc(sk, id); |
1da177e4 | 4257 | struct socket *sock; |
d570ee49 | 4258 | struct sctp_af *af; |
1da177e4 LT |
4259 | int err = 0; |
4260 | ||
0343c554 BP |
4261 | if (!asoc) |
4262 | return -EINVAL; | |
4263 | ||
1da177e4 LT |
4264 | /* An association cannot be branched off from an already peeled-off |
4265 | * socket, nor is this supported for tcp style sockets. | |
4266 | */ | |
4267 | if (!sctp_style(sk, UDP)) | |
4268 | return -EINVAL; | |
4269 | ||
4270 | /* Create a new socket. */ | |
4271 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4272 | if (err < 0) | |
4273 | return err; | |
4274 | ||
914e1c8b | 4275 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4276 | |
4277 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4278 | * Set the daddr and initialize id to something more random | |
4279 | */ | |
d570ee49 VY |
4280 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4281 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
914e1c8b VY |
4282 | |
4283 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4284 | * asoc to the newsk. | |
4285 | */ | |
4286 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4287 | |
1da177e4 LT |
4288 | *sockp = sock; |
4289 | ||
4290 | return err; | |
4291 | } | |
0343c554 | 4292 | EXPORT_SYMBOL(sctp_do_peeloff); |
1da177e4 LT |
4293 | |
4294 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4295 | { | |
4296 | sctp_peeloff_arg_t peeloff; | |
4297 | struct socket *newsock; | |
56b31d1c | 4298 | struct file *newfile; |
1da177e4 | 4299 | int retval = 0; |
1da177e4 | 4300 | |
408f22e8 | 4301 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4302 | return -EINVAL; |
408f22e8 | 4303 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4304 | if (copy_from_user(&peeloff, optval, len)) |
4305 | return -EFAULT; | |
4306 | ||
0343c554 | 4307 | retval = sctp_do_peeloff(sk, peeloff.associd, &newsock); |
1da177e4 LT |
4308 | if (retval < 0) |
4309 | goto out; | |
4310 | ||
4311 | /* Map the socket to an unused fd that can be returned to the user. */ | |
8a59bd3e | 4312 | retval = get_unused_fd_flags(0); |
1da177e4 LT |
4313 | if (retval < 0) { |
4314 | sock_release(newsock); | |
4315 | goto out; | |
4316 | } | |
4317 | ||
aab174f0 | 4318 | newfile = sock_alloc_file(newsock, 0, NULL); |
56b31d1c AV |
4319 | if (unlikely(IS_ERR(newfile))) { |
4320 | put_unused_fd(retval); | |
4321 | sock_release(newsock); | |
4322 | return PTR_ERR(newfile); | |
4323 | } | |
4324 | ||
bb33381d DB |
4325 | pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk, |
4326 | retval); | |
1da177e4 LT |
4327 | |
4328 | /* Return the fd mapped to the new socket. */ | |
56b31d1c AV |
4329 | if (put_user(len, optlen)) { |
4330 | fput(newfile); | |
4331 | put_unused_fd(retval); | |
4332 | return -EFAULT; | |
4333 | } | |
1da177e4 | 4334 | peeloff.sd = retval; |
56b31d1c AV |
4335 | if (copy_to_user(optval, &peeloff, len)) { |
4336 | fput(newfile); | |
4337 | put_unused_fd(retval); | |
408f22e8 | 4338 | return -EFAULT; |
56b31d1c AV |
4339 | } |
4340 | fd_install(retval, newfile); | |
1da177e4 LT |
4341 | out: |
4342 | return retval; | |
4343 | } | |
4344 | ||
4345 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4346 | * | |
4347 | * Applications can enable or disable heartbeats for any peer address of | |
4348 | * an association, modify an address's heartbeat interval, force a | |
4349 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4350 | * number of retransmissions sent before an address is considered | |
4351 | * unreachable. The following structure is used to access and modify an | |
4352 | * address's parameters: | |
4353 | * | |
4354 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4355 | * sctp_assoc_t spp_assoc_id; |
4356 | * struct sockaddr_storage spp_address; | |
4357 | * uint32_t spp_hbinterval; | |
4358 | * uint16_t spp_pathmaxrxt; | |
4359 | * uint32_t spp_pathmtu; | |
4360 | * uint32_t spp_sackdelay; | |
4361 | * uint32_t spp_flags; | |
4362 | * }; | |
4363 | * | |
4364 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4365 | * application, and identifies the association for | |
4366 | * this query. | |
1da177e4 LT |
4367 | * spp_address - This specifies which address is of interest. |
4368 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4369 | * in milliseconds. If a value of zero |
4370 | * is present in this field then no changes are to | |
4371 | * be made to this parameter. | |
1da177e4 LT |
4372 | * spp_pathmaxrxt - This contains the maximum number of |
4373 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4374 | * considered unreachable. If a value of zero |
4375 | * is present in this field then no changes are to | |
4376 | * be made to this parameter. | |
4377 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4378 | * specified here will be the "fixed" path mtu. | |
4379 | * Note that if the spp_address field is empty | |
4380 | * then all associations on this address will | |
4381 | * have this fixed path mtu set upon them. | |
4382 | * | |
4383 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4384 | * the number of milliseconds that sacks will be delayed | |
4385 | * for. This value will apply to all addresses of an | |
4386 | * association if the spp_address field is empty. Note | |
4387 | * also, that if delayed sack is enabled and this | |
4388 | * value is set to 0, no change is made to the last | |
4389 | * recorded delayed sack timer value. | |
4390 | * | |
4391 | * spp_flags - These flags are used to control various features | |
4392 | * on an association. The flag field may contain | |
4393 | * zero or more of the following options. | |
4394 | * | |
4395 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4396 | * specified address. Note that if the address | |
4397 | * field is empty all addresses for the association | |
4398 | * have heartbeats enabled upon them. | |
4399 | * | |
4400 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4401 | * speicifed address. Note that if the address | |
4402 | * field is empty all addresses for the association | |
4403 | * will have their heartbeats disabled. Note also | |
4404 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4405 | * mutually exclusive, only one of these two should | |
4406 | * be specified. Enabling both fields will have | |
4407 | * undetermined results. | |
4408 | * | |
4409 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4410 | * to be made immediately. | |
4411 | * | |
4412 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4413 | * discovery upon the specified address. Note that | |
4414 | * if the address feild is empty then all addresses | |
4415 | * on the association are effected. | |
4416 | * | |
4417 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4418 | * discovery upon the specified address. Note that | |
4419 | * if the address feild is empty then all addresses | |
4420 | * on the association are effected. Not also that | |
4421 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4422 | * exclusive. Enabling both will have undetermined | |
4423 | * results. | |
4424 | * | |
4425 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4426 | * on delayed sack. The time specified in spp_sackdelay | |
4427 | * is used to specify the sack delay for this address. Note | |
4428 | * that if spp_address is empty then all addresses will | |
4429 | * enable delayed sack and take on the sack delay | |
4430 | * value specified in spp_sackdelay. | |
4431 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4432 | * off delayed sack. If the spp_address field is blank then | |
4433 | * delayed sack is disabled for the entire association. Note | |
4434 | * also that this field is mutually exclusive to | |
4435 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4436 | * results. | |
1da177e4 LT |
4437 | */ |
4438 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4439 | char __user *optval, int __user *optlen) |
1da177e4 | 4440 | { |
52ccb8e9 FF |
4441 | struct sctp_paddrparams params; |
4442 | struct sctp_transport *trans = NULL; | |
4443 | struct sctp_association *asoc = NULL; | |
4444 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4445 | |
408f22e8 | 4446 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4447 | return -EINVAL; |
408f22e8 | 4448 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4449 | if (copy_from_user(¶ms, optval, len)) |
4450 | return -EFAULT; | |
4451 | ||
52ccb8e9 FF |
4452 | /* If an address other than INADDR_ANY is specified, and |
4453 | * no transport is found, then the request is invalid. | |
1da177e4 | 4454 | */ |
52cae8f0 | 4455 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4456 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4457 | params.spp_assoc_id); | |
4458 | if (!trans) { | |
bb33381d | 4459 | pr_debug("%s: failed no transport\n", __func__); |
52ccb8e9 FF |
4460 | return -EINVAL; |
4461 | } | |
1da177e4 LT |
4462 | } |
4463 | ||
52ccb8e9 FF |
4464 | /* Get association, if assoc_id != 0 and the socket is a one |
4465 | * to many style socket, and an association was not found, then | |
4466 | * the id was invalid. | |
4467 | */ | |
4468 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4469 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
bb33381d | 4470 | pr_debug("%s: failed no association\n", __func__); |
1da177e4 | 4471 | return -EINVAL; |
52ccb8e9 | 4472 | } |
1da177e4 | 4473 | |
52ccb8e9 FF |
4474 | if (trans) { |
4475 | /* Fetch transport values. */ | |
4476 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4477 | params.spp_pathmtu = trans->pathmtu; | |
4478 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4479 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4480 | ||
4481 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4482 | params.spp_flags = trans->param_flags; | |
4483 | } else if (asoc) { | |
4484 | /* Fetch association values. */ | |
4485 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4486 | params.spp_pathmtu = asoc->pathmtu; | |
4487 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4488 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4489 | ||
4490 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4491 | params.spp_flags = asoc->param_flags; | |
4492 | } else { | |
4493 | /* Fetch socket values. */ | |
4494 | params.spp_hbinterval = sp->hbinterval; | |
4495 | params.spp_pathmtu = sp->pathmtu; | |
4496 | params.spp_sackdelay = sp->sackdelay; | |
4497 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4498 | |
52ccb8e9 FF |
4499 | /*draft-11 doesn't say what to return in spp_flags*/ |
4500 | params.spp_flags = sp->param_flags; | |
4501 | } | |
1da177e4 | 4502 | |
1da177e4 LT |
4503 | if (copy_to_user(optval, ¶ms, len)) |
4504 | return -EFAULT; | |
4505 | ||
4506 | if (put_user(len, optlen)) | |
4507 | return -EFAULT; | |
4508 | ||
4509 | return 0; | |
4510 | } | |
4511 | ||
d364d927 WY |
4512 | /* |
4513 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4514 | * | |
4515 | * This option will effect the way delayed acks are performed. This | |
4516 | * option allows you to get or set the delayed ack time, in | |
4517 | * milliseconds. It also allows changing the delayed ack frequency. | |
4518 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4519 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4520 | * values. If the assoc_id field is non-zero, then the set or get | |
4521 | * effects the specified association for the one to many model (the | |
4522 | * assoc_id field is ignored by the one to one model). Note that if | |
4523 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4524 | * current values will remain unchanged. | |
4525 | * | |
4526 | * struct sctp_sack_info { | |
4527 | * sctp_assoc_t sack_assoc_id; | |
4528 | * uint32_t sack_delay; | |
4529 | * uint32_t sack_freq; | |
4530 | * }; | |
7708610b | 4531 | * |
d364d927 WY |
4532 | * sack_assoc_id - This parameter, indicates which association the user |
4533 | * is performing an action upon. Note that if this field's value is | |
4534 | * zero then the endpoints default value is changed (effecting future | |
4535 | * associations only). | |
7708610b | 4536 | * |
d364d927 WY |
4537 | * sack_delay - This parameter contains the number of milliseconds that |
4538 | * the user is requesting the delayed ACK timer be set to. Note that | |
4539 | * this value is defined in the standard to be between 200 and 500 | |
4540 | * milliseconds. | |
7708610b | 4541 | * |
d364d927 WY |
4542 | * sack_freq - This parameter contains the number of packets that must |
4543 | * be received before a sack is sent without waiting for the delay | |
4544 | * timer to expire. The default value for this is 2, setting this | |
4545 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4546 | */ |
d364d927 | 4547 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4548 | char __user *optval, |
4549 | int __user *optlen) | |
4550 | { | |
d364d927 | 4551 | struct sctp_sack_info params; |
7708610b FF |
4552 | struct sctp_association *asoc = NULL; |
4553 | struct sctp_sock *sp = sctp_sk(sk); | |
4554 | ||
d364d927 WY |
4555 | if (len >= sizeof(struct sctp_sack_info)) { |
4556 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4557 | |
d364d927 WY |
4558 | if (copy_from_user(¶ms, optval, len)) |
4559 | return -EFAULT; | |
4560 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
4561 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
4562 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
4563 | if (copy_from_user(¶ms, optval, len)) |
4564 | return -EFAULT; | |
4565 | } else | |
4566 | return - EINVAL; | |
7708610b | 4567 | |
d364d927 | 4568 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4569 | * to many style socket, and an association was not found, then |
4570 | * the id was invalid. | |
d808ad9a | 4571 | */ |
d364d927 WY |
4572 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4573 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4574 | return -EINVAL; |
4575 | ||
4576 | if (asoc) { | |
4577 | /* Fetch association values. */ | |
d364d927 WY |
4578 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4579 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4580 | asoc->sackdelay); |
d364d927 WY |
4581 | params.sack_freq = asoc->sackfreq; |
4582 | ||
4583 | } else { | |
4584 | params.sack_delay = 0; | |
4585 | params.sack_freq = 1; | |
4586 | } | |
7708610b FF |
4587 | } else { |
4588 | /* Fetch socket values. */ | |
d364d927 WY |
4589 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4590 | params.sack_delay = sp->sackdelay; | |
4591 | params.sack_freq = sp->sackfreq; | |
4592 | } else { | |
4593 | params.sack_delay = 0; | |
4594 | params.sack_freq = 1; | |
4595 | } | |
7708610b FF |
4596 | } |
4597 | ||
4598 | if (copy_to_user(optval, ¶ms, len)) | |
4599 | return -EFAULT; | |
4600 | ||
4601 | if (put_user(len, optlen)) | |
4602 | return -EFAULT; | |
4603 | ||
4604 | return 0; | |
4605 | } | |
4606 | ||
1da177e4 LT |
4607 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4608 | * | |
4609 | * Applications can specify protocol parameters for the default association | |
4610 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4611 | * is SCTP_INITMSG. | |
4612 | * | |
4613 | * Setting initialization parameters is effective only on an unconnected | |
4614 | * socket (for UDP-style sockets only future associations are effected | |
4615 | * by the change). With TCP-style sockets, this option is inherited by | |
4616 | * sockets derived from a listener socket. | |
4617 | */ | |
4618 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4619 | { | |
408f22e8 | 4620 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4621 | return -EINVAL; |
408f22e8 NH |
4622 | len = sizeof(struct sctp_initmsg); |
4623 | if (put_user(len, optlen)) | |
4624 | return -EFAULT; | |
1da177e4 LT |
4625 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4626 | return -EFAULT; | |
4627 | return 0; | |
4628 | } | |
4629 |