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 | |
4b2f13a2 JK |
31 | * along with GNU CC; see the file COPYING. If not, see |
32 | * <http://www.gnu.org/licenses/>. | |
1da177e4 LT |
33 | * |
34 | * Please send any bug reports or fixes you make to the | |
35 | * email address(es): | |
91705c61 | 36 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 37 | * |
1da177e4 LT |
38 | * Written or modified by: |
39 | * La Monte H.P. Yarroll <piggy@acm.org> | |
40 | * Narasimha Budihal <narsi@refcode.org> | |
41 | * Karl Knutson <karl@athena.chicago.il.us> | |
42 | * Jon Grimm <jgrimm@us.ibm.com> | |
43 | * Xingang Guo <xingang.guo@intel.com> | |
44 | * Daisy Chang <daisyc@us.ibm.com> | |
45 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
46 | * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com> | |
47 | * Ardelle Fan <ardelle.fan@intel.com> | |
48 | * Ryan Layer <rmlayer@us.ibm.com> | |
49 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> | |
50 | * Kevin Gao <kevin.gao@intel.com> | |
1da177e4 LT |
51 | */ |
52 | ||
145ce502 JP |
53 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
54 | ||
1da177e4 LT |
55 | #include <linux/types.h> |
56 | #include <linux/kernel.h> | |
57 | #include <linux/wait.h> | |
58 | #include <linux/time.h> | |
59 | #include <linux/ip.h> | |
4fc268d2 | 60 | #include <linux/capability.h> |
1da177e4 LT |
61 | #include <linux/fcntl.h> |
62 | #include <linux/poll.h> | |
63 | #include <linux/init.h> | |
64 | #include <linux/crypto.h> | |
5a0e3ad6 | 65 | #include <linux/slab.h> |
56b31d1c | 66 | #include <linux/file.h> |
ffd59393 | 67 | #include <linux/compat.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> | |
8465a5fc | 74 | #include <net/busy_poll.h> |
1da177e4 LT |
75 | |
76 | #include <linux/socket.h> /* for sa_family_t */ | |
bc3b2d7f | 77 | #include <linux/export.h> |
1da177e4 LT |
78 | #include <net/sock.h> |
79 | #include <net/sctp/sctp.h> | |
80 | #include <net/sctp/sm.h> | |
81 | ||
1da177e4 LT |
82 | /* Forward declarations for internal helper functions. */ |
83 | static int sctp_writeable(struct sock *sk); | |
84 | static void sctp_wfree(struct sk_buff *skb); | |
85 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, | |
86 | size_t msg_len); | |
26ac8e5f | 87 | static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p); |
1da177e4 LT |
88 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); |
89 | static int sctp_wait_for_accept(struct sock *sk, long timeo); | |
90 | static void sctp_wait_for_close(struct sock *sk, long timeo); | |
0a2fbac1 | 91 | static void sctp_destruct_sock(struct sock *sk); |
1da177e4 LT |
92 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
93 | union sctp_addr *addr, int len); | |
94 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); | |
95 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); | |
96 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); | |
97 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); | |
98 | static int sctp_send_asconf(struct sctp_association *asoc, | |
99 | struct sctp_chunk *chunk); | |
100 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); | |
101 | static int sctp_autobind(struct sock *sk); | |
102 | static void sctp_sock_migrate(struct sock *, struct sock *, | |
103 | struct sctp_association *, sctp_socket_type_t); | |
1da177e4 | 104 | |
b6fa1a4d | 105 | static int sctp_memory_pressure; |
8d987e5c | 106 | static atomic_long_t sctp_memory_allocated; |
1748376b | 107 | struct percpu_counter sctp_sockets_allocated; |
4d93df0a | 108 | |
5c52ba17 | 109 | static void sctp_enter_memory_pressure(struct sock *sk) |
4d93df0a NH |
110 | { |
111 | sctp_memory_pressure = 1; | |
112 | } | |
113 | ||
114 | ||
1da177e4 LT |
115 | /* Get the sndbuf space available at the time on the association. */ |
116 | static inline int sctp_wspace(struct sctp_association *asoc) | |
117 | { | |
4d93df0a | 118 | int amt; |
1da177e4 | 119 | |
4d93df0a NH |
120 | if (asoc->ep->sndbuf_policy) |
121 | amt = asoc->sndbuf_used; | |
122 | else | |
31e6d363 | 123 | amt = sk_wmem_alloc_get(asoc->base.sk); |
4d93df0a NH |
124 | |
125 | if (amt >= asoc->base.sk->sk_sndbuf) { | |
126 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
127 | amt = 0; | |
128 | else { | |
129 | amt = sk_stream_wspace(asoc->base.sk); | |
130 | if (amt < 0) | |
131 | amt = 0; | |
132 | } | |
4eb701df | 133 | } else { |
4d93df0a | 134 | amt = asoc->base.sk->sk_sndbuf - amt; |
4eb701df | 135 | } |
1da177e4 LT |
136 | return amt; |
137 | } | |
138 | ||
139 | /* Increment the used sndbuf space count of the corresponding association by | |
140 | * the size of the outgoing data chunk. | |
141 | * Also, set the skb destructor for sndbuf accounting later. | |
142 | * | |
143 | * Since it is always 1-1 between chunk and skb, and also a new skb is always | |
144 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the | |
145 | * destructor in the data chunk skb for the purpose of the sndbuf space | |
146 | * tracking. | |
147 | */ | |
148 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) | |
149 | { | |
150 | struct sctp_association *asoc = chunk->asoc; | |
151 | struct sock *sk = asoc->base.sk; | |
152 | ||
153 | /* The sndbuf space is tracked per association. */ | |
154 | sctp_association_hold(asoc); | |
155 | ||
4eb701df NH |
156 | skb_set_owner_w(chunk->skb, sk); |
157 | ||
1da177e4 LT |
158 | chunk->skb->destructor = sctp_wfree; |
159 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ | |
f869c912 | 160 | skb_shinfo(chunk->skb)->destructor_arg = chunk; |
1da177e4 | 161 | |
4eb701df NH |
162 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
163 | sizeof(struct sk_buff) + | |
164 | sizeof(struct sctp_chunk); | |
165 | ||
4eb701df | 166 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
3ab224be HA |
167 | sk->sk_wmem_queued += chunk->skb->truesize; |
168 | sk_mem_charge(sk, chunk->skb->truesize); | |
1da177e4 LT |
169 | } |
170 | ||
171 | /* Verify that this is a valid address. */ | |
172 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, | |
173 | int len) | |
174 | { | |
175 | struct sctp_af *af; | |
176 | ||
177 | /* Verify basic sockaddr. */ | |
178 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); | |
179 | if (!af) | |
180 | return -EINVAL; | |
181 | ||
182 | /* Is this a valid SCTP address? */ | |
5636bef7 | 183 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
1da177e4 LT |
184 | return -EINVAL; |
185 | ||
186 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) | |
187 | return -EINVAL; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | /* Look up the association by its id. If this is not a UDP-style | |
193 | * socket, the ID field is always ignored. | |
194 | */ | |
195 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) | |
196 | { | |
197 | struct sctp_association *asoc = NULL; | |
198 | ||
199 | /* If this is not a UDP-style socket, assoc id should be ignored. */ | |
200 | if (!sctp_style(sk, UDP)) { | |
201 | /* Return NULL if the socket state is not ESTABLISHED. It | |
202 | * could be a TCP-style listening socket or a socket which | |
203 | * hasn't yet called connect() to establish an association. | |
204 | */ | |
205 | if (!sctp_sstate(sk, ESTABLISHED)) | |
206 | return NULL; | |
207 | ||
208 | /* Get the first and the only association from the list. */ | |
209 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) | |
210 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, | |
211 | struct sctp_association, asocs); | |
212 | return asoc; | |
213 | } | |
214 | ||
215 | /* Otherwise this is a UDP-style socket. */ | |
216 | if (!id || (id == (sctp_assoc_t)-1)) | |
217 | return NULL; | |
218 | ||
219 | spin_lock_bh(&sctp_assocs_id_lock); | |
220 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); | |
221 | spin_unlock_bh(&sctp_assocs_id_lock); | |
222 | ||
223 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) | |
224 | return NULL; | |
225 | ||
226 | return asoc; | |
227 | } | |
228 | ||
229 | /* Look up the transport from an address and an assoc id. If both address and | |
230 | * id are specified, the associations matching the address and the id should be | |
231 | * the same. | |
232 | */ | |
233 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, | |
234 | struct sockaddr_storage *addr, | |
235 | sctp_assoc_t id) | |
236 | { | |
237 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; | |
238 | struct sctp_transport *transport; | |
239 | union sctp_addr *laddr = (union sctp_addr *)addr; | |
240 | ||
1da177e4 | 241 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
cd4ff034 | 242 | laddr, |
1da177e4 | 243 | &transport); |
1da177e4 LT |
244 | |
245 | if (!addr_asoc) | |
246 | return NULL; | |
247 | ||
248 | id_asoc = sctp_id2assoc(sk, id); | |
249 | if (id_asoc && (id_asoc != addr_asoc)) | |
250 | return NULL; | |
251 | ||
299ee123 | 252 | sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk), |
1da177e4 LT |
253 | (union sctp_addr *)addr); |
254 | ||
255 | return transport; | |
256 | } | |
257 | ||
258 | /* API 3.1.2 bind() - UDP Style Syntax | |
259 | * The syntax of bind() is, | |
260 | * | |
261 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); | |
262 | * | |
263 | * sd - the socket descriptor returned by socket(). | |
264 | * addr - the address structure (struct sockaddr_in or struct | |
265 | * sockaddr_in6 [RFC 2553]), | |
266 | * addr_len - the size of the address structure. | |
267 | */ | |
dda91928 | 268 | static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
1da177e4 LT |
269 | { |
270 | int retval = 0; | |
271 | ||
048ed4b6 | 272 | lock_sock(sk); |
1da177e4 | 273 | |
bb33381d DB |
274 | pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk, |
275 | addr, addr_len); | |
1da177e4 LT |
276 | |
277 | /* Disallow binding twice. */ | |
278 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
3f7a87d2 | 279 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
1da177e4 LT |
280 | addr_len); |
281 | else | |
282 | retval = -EINVAL; | |
283 | ||
048ed4b6 | 284 | release_sock(sk); |
1da177e4 LT |
285 | |
286 | return retval; | |
287 | } | |
288 | ||
289 | static long sctp_get_port_local(struct sock *, union sctp_addr *); | |
290 | ||
291 | /* Verify this is a valid sockaddr. */ | |
292 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
293 | union sctp_addr *addr, int len) | |
294 | { | |
295 | struct sctp_af *af; | |
296 | ||
297 | /* Check minimum size. */ | |
298 | if (len < sizeof (struct sockaddr)) | |
299 | return NULL; | |
300 | ||
7dab83de VY |
301 | /* V4 mapped address are really of AF_INET family */ |
302 | if (addr->sa.sa_family == AF_INET6 && | |
303 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { | |
304 | if (!opt->pf->af_supported(AF_INET, opt)) | |
305 | return NULL; | |
306 | } else { | |
307 | /* Does this PF support this AF? */ | |
308 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) | |
309 | return NULL; | |
310 | } | |
1da177e4 LT |
311 | |
312 | /* If we get this far, af is valid. */ | |
313 | af = sctp_get_af_specific(addr->sa.sa_family); | |
314 | ||
315 | if (len < af->sockaddr_len) | |
316 | return NULL; | |
317 | ||
318 | return af; | |
319 | } | |
320 | ||
321 | /* Bind a local address either to an endpoint or to an association. */ | |
dda91928 | 322 | static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) |
1da177e4 | 323 | { |
3594698a | 324 | struct net *net = sock_net(sk); |
1da177e4 LT |
325 | struct sctp_sock *sp = sctp_sk(sk); |
326 | struct sctp_endpoint *ep = sp->ep; | |
327 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
328 | struct sctp_af *af; | |
329 | unsigned short snum; | |
330 | int ret = 0; | |
331 | ||
1da177e4 LT |
332 | /* Common sockaddr verification. */ |
333 | af = sctp_sockaddr_af(sp, addr, len); | |
3f7a87d2 | 334 | if (!af) { |
bb33381d DB |
335 | pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n", |
336 | __func__, sk, addr, len); | |
1da177e4 | 337 | return -EINVAL; |
3f7a87d2 FF |
338 | } |
339 | ||
340 | snum = ntohs(addr->v4.sin_port); | |
341 | ||
bb33381d DB |
342 | pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n", |
343 | __func__, sk, &addr->sa, bp->port, snum, len); | |
1da177e4 LT |
344 | |
345 | /* PF specific bind() address verification. */ | |
346 | if (!sp->pf->bind_verify(sp, addr)) | |
347 | return -EADDRNOTAVAIL; | |
348 | ||
8b358056 VY |
349 | /* We must either be unbound, or bind to the same port. |
350 | * It's OK to allow 0 ports if we are already bound. | |
351 | * We'll just inhert an already bound port in this case | |
352 | */ | |
353 | if (bp->port) { | |
354 | if (!snum) | |
355 | snum = bp->port; | |
356 | else if (snum != bp->port) { | |
bb33381d DB |
357 | pr_debug("%s: new port %d doesn't match existing port " |
358 | "%d\n", __func__, snum, bp->port); | |
8b358056 VY |
359 | return -EINVAL; |
360 | } | |
1da177e4 LT |
361 | } |
362 | ||
3594698a EB |
363 | if (snum && snum < PROT_SOCK && |
364 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
365 | return -EACCES; |
366 | ||
4e54064e VY |
367 | /* See if the address matches any of the addresses we may have |
368 | * already bound before checking against other endpoints. | |
369 | */ | |
370 | if (sctp_bind_addr_match(bp, addr, sp)) | |
371 | return -EINVAL; | |
372 | ||
1da177e4 LT |
373 | /* Make sure we are allowed to bind here. |
374 | * The function sctp_get_port_local() does duplicate address | |
375 | * detection. | |
376 | */ | |
2772b495 | 377 | addr->v4.sin_port = htons(snum); |
1da177e4 | 378 | if ((ret = sctp_get_port_local(sk, addr))) { |
4e54064e | 379 | return -EADDRINUSE; |
1da177e4 LT |
380 | } |
381 | ||
382 | /* Refresh ephemeral port. */ | |
383 | if (!bp->port) | |
c720c7e8 | 384 | bp->port = inet_sk(sk)->inet_num; |
1da177e4 | 385 | |
559cf710 VY |
386 | /* Add the address to the bind address list. |
387 | * Use GFP_ATOMIC since BHs will be disabled. | |
388 | */ | |
f57d96b2 | 389 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
1da177e4 LT |
390 | |
391 | /* Copy back into socket for getsockname() use. */ | |
392 | if (!ret) { | |
c720c7e8 | 393 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
299ee123 | 394 | sp->pf->to_sk_saddr(addr, sk); |
1da177e4 LT |
395 | } |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
400 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
401 | * | |
d808ad9a | 402 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
1da177e4 | 403 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
d808ad9a | 404 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
1da177e4 | 405 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
d808ad9a YH |
406 | * subsequent ASCONF. Note this restriction binds each side, so at any |
407 | * time two ASCONF may be in-transit on any given association (one sent | |
1da177e4 LT |
408 | * from each endpoint). |
409 | */ | |
410 | static int sctp_send_asconf(struct sctp_association *asoc, | |
411 | struct sctp_chunk *chunk) | |
412 | { | |
55e26eb9 | 413 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
414 | int retval = 0; |
415 | ||
416 | /* If there is an outstanding ASCONF chunk, queue it for later | |
417 | * transmission. | |
d808ad9a | 418 | */ |
1da177e4 | 419 | if (asoc->addip_last_asconf) { |
79af02c2 | 420 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
d808ad9a | 421 | goto out; |
1da177e4 LT |
422 | } |
423 | ||
424 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
425 | sctp_chunk_hold(chunk); | |
55e26eb9 | 426 | retval = sctp_primitive_ASCONF(net, asoc, chunk); |
1da177e4 LT |
427 | if (retval) |
428 | sctp_chunk_free(chunk); | |
429 | else | |
430 | asoc->addip_last_asconf = chunk; | |
431 | ||
432 | out: | |
433 | return retval; | |
434 | } | |
435 | ||
436 | /* Add a list of addresses as bind addresses to local endpoint or | |
437 | * association. | |
438 | * | |
439 | * Basically run through each address specified in the addrs/addrcnt | |
440 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
441 | * sctp_do_bind() on it. | |
442 | * | |
443 | * If any of them fails, then the operation will be reversed and the | |
444 | * ones that were added will be removed. | |
445 | * | |
446 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
447 | */ | |
04675210 | 448 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
449 | { |
450 | int cnt; | |
451 | int retval = 0; | |
452 | void *addr_buf; | |
453 | struct sockaddr *sa_addr; | |
454 | struct sctp_af *af; | |
455 | ||
bb33381d DB |
456 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk, |
457 | addrs, addrcnt); | |
1da177e4 LT |
458 | |
459 | addr_buf = addrs; | |
460 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
461 | /* The list may contain either IPv4 or IPv6 address; | |
462 | * determine the address length for walking thru the list. | |
463 | */ | |
ea110733 | 464 | sa_addr = addr_buf; |
1da177e4 LT |
465 | af = sctp_get_af_specific(sa_addr->sa_family); |
466 | if (!af) { | |
467 | retval = -EINVAL; | |
468 | goto err_bindx_add; | |
469 | } | |
470 | ||
d808ad9a | 471 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
1da177e4 LT |
472 | af->sockaddr_len); |
473 | ||
474 | addr_buf += af->sockaddr_len; | |
475 | ||
476 | err_bindx_add: | |
477 | if (retval < 0) { | |
478 | /* Failed. Cleanup the ones that have been added */ | |
479 | if (cnt > 0) | |
480 | sctp_bindx_rem(sk, addrs, cnt); | |
481 | return retval; | |
482 | } | |
483 | } | |
484 | ||
485 | return retval; | |
486 | } | |
487 | ||
488 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the | |
489 | * associations that are part of the endpoint indicating that a list of local | |
490 | * addresses are added to the endpoint. | |
491 | * | |
d808ad9a | 492 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
493 | * association, we do not send the chunk for that association. But it will not |
494 | * affect other associations. | |
495 | * | |
496 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
497 | */ | |
d808ad9a | 498 | static int sctp_send_asconf_add_ip(struct sock *sk, |
1da177e4 LT |
499 | struct sockaddr *addrs, |
500 | int addrcnt) | |
501 | { | |
e1fc3b14 | 502 | struct net *net = sock_net(sk); |
1da177e4 LT |
503 | struct sctp_sock *sp; |
504 | struct sctp_endpoint *ep; | |
505 | struct sctp_association *asoc; | |
506 | struct sctp_bind_addr *bp; | |
507 | struct sctp_chunk *chunk; | |
508 | struct sctp_sockaddr_entry *laddr; | |
509 | union sctp_addr *addr; | |
dc022a98 | 510 | union sctp_addr saveaddr; |
1da177e4 LT |
511 | void *addr_buf; |
512 | struct sctp_af *af; | |
1da177e4 LT |
513 | struct list_head *p; |
514 | int i; | |
515 | int retval = 0; | |
516 | ||
e1fc3b14 | 517 | if (!net->sctp.addip_enable) |
1da177e4 LT |
518 | return retval; |
519 | ||
520 | sp = sctp_sk(sk); | |
521 | ep = sp->ep; | |
522 | ||
bb33381d DB |
523 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
524 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 525 | |
9dbc15f0 | 526 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
527 | if (!asoc->peer.asconf_capable) |
528 | continue; | |
529 | ||
530 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) | |
531 | continue; | |
532 | ||
533 | if (!sctp_state(asoc, ESTABLISHED)) | |
534 | continue; | |
535 | ||
536 | /* Check if any address in the packed array of addresses is | |
d808ad9a YH |
537 | * in the bind address list of the association. If so, |
538 | * do not send the asconf chunk to its peer, but continue with | |
1da177e4 LT |
539 | * other associations. |
540 | */ | |
541 | addr_buf = addrs; | |
542 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 543 | addr = addr_buf; |
1da177e4 LT |
544 | af = sctp_get_af_specific(addr->v4.sin_family); |
545 | if (!af) { | |
546 | retval = -EINVAL; | |
547 | goto out; | |
548 | } | |
549 | ||
550 | if (sctp_assoc_lookup_laddr(asoc, addr)) | |
551 | break; | |
552 | ||
553 | addr_buf += af->sockaddr_len; | |
554 | } | |
555 | if (i < addrcnt) | |
556 | continue; | |
557 | ||
559cf710 VY |
558 | /* Use the first valid address in bind addr list of |
559 | * association as Address Parameter of ASCONF CHUNK. | |
1da177e4 | 560 | */ |
1da177e4 LT |
561 | bp = &asoc->base.bind_addr; |
562 | p = bp->address_list.next; | |
563 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
5ae955cf | 564 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
1da177e4 LT |
565 | addrcnt, SCTP_PARAM_ADD_IP); |
566 | if (!chunk) { | |
567 | retval = -ENOMEM; | |
568 | goto out; | |
569 | } | |
570 | ||
dc022a98 SS |
571 | /* Add the new addresses to the bind address list with |
572 | * use_as_src set to 0. | |
1da177e4 | 573 | */ |
dc022a98 SS |
574 | addr_buf = addrs; |
575 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 576 | addr = addr_buf; |
dc022a98 SS |
577 | af = sctp_get_af_specific(addr->v4.sin_family); |
578 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
f57d96b2 VY |
579 | retval = sctp_add_bind_addr(bp, &saveaddr, |
580 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
581 | addr_buf += af->sockaddr_len; |
582 | } | |
8a07eb0a MH |
583 | if (asoc->src_out_of_asoc_ok) { |
584 | struct sctp_transport *trans; | |
585 | ||
586 | list_for_each_entry(trans, | |
587 | &asoc->peer.transport_addr_list, transports) { | |
588 | /* Clear the source and route cache */ | |
589 | dst_release(trans->dst); | |
590 | trans->cwnd = min(4*asoc->pathmtu, max_t(__u32, | |
591 | 2*asoc->pathmtu, 4380)); | |
592 | trans->ssthresh = asoc->peer.i.a_rwnd; | |
593 | trans->rto = asoc->rto_initial; | |
196d6759 | 594 | sctp_max_rto(asoc, trans); |
8a07eb0a MH |
595 | trans->rtt = trans->srtt = trans->rttvar = 0; |
596 | sctp_transport_route(trans, NULL, | |
597 | sctp_sk(asoc->base.sk)); | |
598 | } | |
599 | } | |
600 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
601 | } |
602 | ||
603 | out: | |
604 | return retval; | |
605 | } | |
606 | ||
607 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
608 | * last address. | |
609 | * | |
610 | * Basically run through each address specified in the addrs/addrcnt | |
611 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
612 | * sctp_del_bind() on it. | |
613 | * | |
614 | * If any of them fails, then the operation will be reversed and the | |
615 | * ones that were removed will be added back. | |
616 | * | |
617 | * At least one address has to be left; if only one address is | |
618 | * available, the operation will return -EBUSY. | |
619 | * | |
620 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
621 | */ | |
04675210 | 622 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
623 | { |
624 | struct sctp_sock *sp = sctp_sk(sk); | |
625 | struct sctp_endpoint *ep = sp->ep; | |
626 | int cnt; | |
627 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
628 | int retval = 0; | |
1da177e4 | 629 | void *addr_buf; |
c9a08505 | 630 | union sctp_addr *sa_addr; |
1da177e4 LT |
631 | struct sctp_af *af; |
632 | ||
bb33381d DB |
633 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
634 | __func__, sk, addrs, addrcnt); | |
1da177e4 LT |
635 | |
636 | addr_buf = addrs; | |
637 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
638 | /* If the bind address list is empty or if there is only one | |
639 | * bind address, there is nothing more to be removed (we need | |
640 | * at least one address here). | |
641 | */ | |
642 | if (list_empty(&bp->address_list) || | |
643 | (sctp_list_single_entry(&bp->address_list))) { | |
644 | retval = -EBUSY; | |
645 | goto err_bindx_rem; | |
646 | } | |
647 | ||
ea110733 | 648 | sa_addr = addr_buf; |
c9a08505 | 649 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1da177e4 LT |
650 | if (!af) { |
651 | retval = -EINVAL; | |
652 | goto err_bindx_rem; | |
653 | } | |
0304ff8a PG |
654 | |
655 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
656 | retval = -EADDRNOTAVAIL; | |
657 | goto err_bindx_rem; | |
658 | } | |
659 | ||
ee9cbaca VY |
660 | if (sa_addr->v4.sin_port && |
661 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
662 | retval = -EINVAL; |
663 | goto err_bindx_rem; | |
664 | } | |
665 | ||
ee9cbaca VY |
666 | if (!sa_addr->v4.sin_port) |
667 | sa_addr->v4.sin_port = htons(bp->port); | |
668 | ||
1da177e4 LT |
669 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
670 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
671 | * be removed. This is something which needs to be looked into | |
672 | * when we are fixing the outstanding issues with multi-homing | |
673 | * socket routing and failover schemes. Refer to comments in | |
674 | * sctp_do_bind(). -daisy | |
675 | */ | |
0ed90fb0 | 676 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
677 | |
678 | addr_buf += af->sockaddr_len; | |
679 | err_bindx_rem: | |
680 | if (retval < 0) { | |
681 | /* Failed. Add the ones that has been removed back */ | |
682 | if (cnt > 0) | |
683 | sctp_bindx_add(sk, addrs, cnt); | |
684 | return retval; | |
685 | } | |
686 | } | |
687 | ||
688 | return retval; | |
689 | } | |
690 | ||
691 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
692 | * the associations that are part of the endpoint indicating that a list of | |
693 | * local addresses are removed from the endpoint. | |
694 | * | |
d808ad9a | 695 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
696 | * association, we do not send the chunk for that association. But it will not |
697 | * affect other associations. | |
698 | * | |
699 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
700 | */ | |
701 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
702 | struct sockaddr *addrs, | |
703 | int addrcnt) | |
704 | { | |
e1fc3b14 | 705 | struct net *net = sock_net(sk); |
1da177e4 LT |
706 | struct sctp_sock *sp; |
707 | struct sctp_endpoint *ep; | |
708 | struct sctp_association *asoc; | |
dc022a98 | 709 | struct sctp_transport *transport; |
1da177e4 LT |
710 | struct sctp_bind_addr *bp; |
711 | struct sctp_chunk *chunk; | |
712 | union sctp_addr *laddr; | |
713 | void *addr_buf; | |
714 | struct sctp_af *af; | |
dc022a98 | 715 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
716 | int i; |
717 | int retval = 0; | |
8a07eb0a | 718 | int stored = 0; |
1da177e4 | 719 | |
8a07eb0a | 720 | chunk = NULL; |
e1fc3b14 | 721 | if (!net->sctp.addip_enable) |
1da177e4 LT |
722 | return retval; |
723 | ||
724 | sp = sctp_sk(sk); | |
725 | ep = sp->ep; | |
726 | ||
bb33381d DB |
727 | pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", |
728 | __func__, sk, addrs, addrcnt); | |
1da177e4 | 729 | |
9dbc15f0 | 730 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
731 | |
732 | if (!asoc->peer.asconf_capable) | |
733 | continue; | |
734 | ||
735 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
736 | continue; | |
737 | ||
738 | if (!sctp_state(asoc, ESTABLISHED)) | |
739 | continue; | |
740 | ||
741 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 742 | * not present in the bind address list of the association. |
1da177e4 LT |
743 | * If so, do not send the asconf chunk to its peer, but |
744 | * continue with other associations. | |
745 | */ | |
746 | addr_buf = addrs; | |
747 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 748 | laddr = addr_buf; |
1da177e4 LT |
749 | af = sctp_get_af_specific(laddr->v4.sin_family); |
750 | if (!af) { | |
751 | retval = -EINVAL; | |
752 | goto out; | |
753 | } | |
754 | ||
755 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
756 | break; | |
757 | ||
758 | addr_buf += af->sockaddr_len; | |
759 | } | |
760 | if (i < addrcnt) | |
761 | continue; | |
762 | ||
763 | /* Find one address in the association's bind address list | |
764 | * that is not in the packed array of addresses. This is to | |
765 | * make sure that we do not delete all the addresses in the | |
766 | * association. | |
767 | */ | |
1da177e4 LT |
768 | bp = &asoc->base.bind_addr; |
769 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
770 | addrcnt, sp); | |
8a07eb0a MH |
771 | if ((laddr == NULL) && (addrcnt == 1)) { |
772 | if (asoc->asconf_addr_del_pending) | |
773 | continue; | |
774 | asoc->asconf_addr_del_pending = | |
775 | kzalloc(sizeof(union sctp_addr), GFP_ATOMIC); | |
6d65e5ee MH |
776 | if (asoc->asconf_addr_del_pending == NULL) { |
777 | retval = -ENOMEM; | |
778 | goto out; | |
779 | } | |
8a07eb0a MH |
780 | asoc->asconf_addr_del_pending->sa.sa_family = |
781 | addrs->sa_family; | |
782 | asoc->asconf_addr_del_pending->v4.sin_port = | |
783 | htons(bp->port); | |
784 | if (addrs->sa_family == AF_INET) { | |
785 | struct sockaddr_in *sin; | |
786 | ||
787 | sin = (struct sockaddr_in *)addrs; | |
788 | asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr; | |
789 | } else if (addrs->sa_family == AF_INET6) { | |
790 | struct sockaddr_in6 *sin6; | |
791 | ||
792 | sin6 = (struct sockaddr_in6 *)addrs; | |
4e3fd7a0 | 793 | asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr; |
8a07eb0a | 794 | } |
bb33381d DB |
795 | |
796 | pr_debug("%s: keep the last address asoc:%p %pISc at %p\n", | |
797 | __func__, asoc, &asoc->asconf_addr_del_pending->sa, | |
798 | asoc->asconf_addr_del_pending); | |
799 | ||
8a07eb0a MH |
800 | asoc->src_out_of_asoc_ok = 1; |
801 | stored = 1; | |
802 | goto skip_mkasconf; | |
803 | } | |
1da177e4 | 804 | |
88362ad8 DB |
805 | if (laddr == NULL) |
806 | return -EINVAL; | |
807 | ||
559cf710 VY |
808 | /* We do not need RCU protection throughout this loop |
809 | * because this is done under a socket lock from the | |
810 | * setsockopt call. | |
811 | */ | |
1da177e4 LT |
812 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
813 | SCTP_PARAM_DEL_IP); | |
814 | if (!chunk) { | |
815 | retval = -ENOMEM; | |
816 | goto out; | |
817 | } | |
818 | ||
8a07eb0a | 819 | skip_mkasconf: |
dc022a98 SS |
820 | /* Reset use_as_src flag for the addresses in the bind address |
821 | * list that are to be deleted. | |
822 | */ | |
dc022a98 SS |
823 | addr_buf = addrs; |
824 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 825 | laddr = addr_buf; |
dc022a98 | 826 | af = sctp_get_af_specific(laddr->v4.sin_family); |
559cf710 | 827 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 828 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 829 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
830 | } |
831 | addr_buf += af->sockaddr_len; | |
832 | } | |
1da177e4 | 833 | |
dc022a98 SS |
834 | /* Update the route and saddr entries for all the transports |
835 | * as some of the addresses in the bind address list are | |
836 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 837 | */ |
9dbc15f0 RD |
838 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
839 | transports) { | |
dc022a98 SS |
840 | dst_release(transport->dst); |
841 | sctp_transport_route(transport, NULL, | |
842 | sctp_sk(asoc->base.sk)); | |
843 | } | |
844 | ||
8a07eb0a MH |
845 | if (stored) |
846 | /* We don't need to transmit ASCONF */ | |
847 | continue; | |
dc022a98 | 848 | retval = sctp_send_asconf(asoc, chunk); |
1da177e4 LT |
849 | } |
850 | out: | |
851 | return retval; | |
852 | } | |
853 | ||
9f7d653b MH |
854 | /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */ |
855 | int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) | |
856 | { | |
857 | struct sock *sk = sctp_opt2sk(sp); | |
858 | union sctp_addr *addr; | |
859 | struct sctp_af *af; | |
860 | ||
861 | /* It is safe to write port space in caller. */ | |
862 | addr = &addrw->a; | |
863 | addr->v4.sin_port = htons(sp->ep->base.bind_addr.port); | |
864 | af = sctp_get_af_specific(addr->sa.sa_family); | |
865 | if (!af) | |
866 | return -EINVAL; | |
867 | if (sctp_verify_addr(sk, addr, af->sockaddr_len)) | |
868 | return -EINVAL; | |
869 | ||
870 | if (addrw->state == SCTP_ADDR_NEW) | |
871 | return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1); | |
872 | else | |
873 | return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1); | |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
877 | * | |
878 | * API 8.1 | |
879 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
880 | * int flags); | |
881 | * | |
882 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
883 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
884 | * or IPv6 addresses. | |
885 | * | |
886 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
887 | * Section 3.1.2 for this usage. | |
888 | * | |
889 | * addrs is a pointer to an array of one or more socket addresses. Each | |
890 | * address is contained in its appropriate structure (i.e. struct | |
891 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 892 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
893 | * representation is termed a "packed array" of addresses). The caller |
894 | * specifies the number of addresses in the array with addrcnt. | |
895 | * | |
896 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
897 | * -1, and sets errno to the appropriate error code. | |
898 | * | |
899 | * For SCTP, the port given in each socket address must be the same, or | |
900 | * sctp_bindx() will fail, setting errno to EINVAL. | |
901 | * | |
902 | * The flags parameter is formed from the bitwise OR of zero or more of | |
903 | * the following currently defined flags: | |
904 | * | |
905 | * SCTP_BINDX_ADD_ADDR | |
906 | * | |
907 | * SCTP_BINDX_REM_ADDR | |
908 | * | |
909 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
910 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
911 | * addresses from the association. The two flags are mutually exclusive; | |
912 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
913 | * not remove all addresses from an association; sctp_bindx() will | |
914 | * reject such an attempt with EINVAL. | |
915 | * | |
916 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
917 | * additional addresses with an endpoint after calling bind(). Or use | |
918 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
919 | * socket is associated with so that no new association accepted will be | |
920 | * associated with those addresses. If the endpoint supports dynamic | |
921 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
922 | * endpoint to send the appropriate message to the peer to change the | |
923 | * peers address lists. | |
924 | * | |
925 | * Adding and removing addresses from a connected association is | |
926 | * optional functionality. Implementations that do not support this | |
927 | * functionality should return EOPNOTSUPP. | |
928 | * | |
929 | * Basically do nothing but copying the addresses from user to kernel | |
930 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
931 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
932 | * from userspace. | |
1da177e4 LT |
933 | * |
934 | * We don't use copy_from_user() for optimization: we first do the | |
935 | * sanity checks (buffer size -fast- and access check-healthy | |
936 | * pointer); if all of those succeed, then we can alloc the memory | |
937 | * (expensive operation) needed to copy the data to kernel. Then we do | |
938 | * the copying without checking the user space area | |
939 | * (__copy_from_user()). | |
940 | * | |
941 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
942 | * it. | |
943 | * | |
944 | * sk The sk of the socket | |
945 | * addrs The pointer to the addresses in user land | |
946 | * addrssize Size of the addrs buffer | |
947 | * op Operation to perform (add or remove, see the flags of | |
948 | * sctp_bindx) | |
949 | * | |
950 | * Returns 0 if ok, <0 errno code on error. | |
951 | */ | |
26ac8e5f | 952 | static int sctp_setsockopt_bindx(struct sock *sk, |
dda91928 DB |
953 | struct sockaddr __user *addrs, |
954 | int addrs_size, int op) | |
1da177e4 LT |
955 | { |
956 | struct sockaddr *kaddrs; | |
957 | int err; | |
958 | int addrcnt = 0; | |
959 | int walk_size = 0; | |
960 | struct sockaddr *sa_addr; | |
961 | void *addr_buf; | |
962 | struct sctp_af *af; | |
963 | ||
bb33381d DB |
964 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n", |
965 | __func__, sk, addrs, addrs_size, op); | |
1da177e4 LT |
966 | |
967 | if (unlikely(addrs_size <= 0)) | |
968 | return -EINVAL; | |
969 | ||
970 | /* Check the user passed a healthy pointer. */ | |
971 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
972 | return -EFAULT; | |
973 | ||
974 | /* Alloc space for the address array in kernel memory. */ | |
cacc0621 | 975 | kaddrs = kmalloc(addrs_size, GFP_USER | __GFP_NOWARN); |
1da177e4 LT |
976 | if (unlikely(!kaddrs)) |
977 | return -ENOMEM; | |
978 | ||
979 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
980 | kfree(kaddrs); | |
981 | return -EFAULT; | |
982 | } | |
983 | ||
d808ad9a | 984 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
985 | addr_buf = kaddrs; |
986 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
987 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
988 | kfree(kaddrs); | |
989 | return -EINVAL; | |
990 | } | |
991 | ||
ea110733 | 992 | sa_addr = addr_buf; |
1da177e4 LT |
993 | af = sctp_get_af_specific(sa_addr->sa_family); |
994 | ||
995 | /* If the address family is not supported or if this address | |
996 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 997 | */ |
1da177e4 LT |
998 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
999 | kfree(kaddrs); | |
1000 | return -EINVAL; | |
1001 | } | |
1002 | addrcnt++; | |
1003 | addr_buf += af->sockaddr_len; | |
1004 | walk_size += af->sockaddr_len; | |
1005 | } | |
1006 | ||
1007 | /* Do the work. */ | |
1008 | switch (op) { | |
1009 | case SCTP_BINDX_ADD_ADDR: | |
1010 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
1011 | if (err) | |
1012 | goto out; | |
1013 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
1014 | break; | |
1015 | ||
1016 | case SCTP_BINDX_REM_ADDR: | |
1017 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
1018 | if (err) | |
1019 | goto out; | |
1020 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
1021 | break; | |
1022 | ||
1023 | default: | |
1024 | err = -EINVAL; | |
1025 | break; | |
3ff50b79 | 1026 | } |
1da177e4 LT |
1027 | |
1028 | out: | |
1029 | kfree(kaddrs); | |
1030 | ||
1031 | return err; | |
1032 | } | |
1033 | ||
3f7a87d2 FF |
1034 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
1035 | * | |
1036 | * Common routine for handling connect() and sctp_connectx(). | |
1037 | * Connect will come in with just a single address. | |
1038 | */ | |
26ac8e5f | 1039 | static int __sctp_connect(struct sock *sk, |
3f7a87d2 | 1040 | struct sockaddr *kaddrs, |
88a0a948 VY |
1041 | int addrs_size, |
1042 | sctp_assoc_t *assoc_id) | |
3f7a87d2 | 1043 | { |
55e26eb9 | 1044 | struct net *net = sock_net(sk); |
3f7a87d2 FF |
1045 | struct sctp_sock *sp; |
1046 | struct sctp_endpoint *ep; | |
1047 | struct sctp_association *asoc = NULL; | |
1048 | struct sctp_association *asoc2; | |
1049 | struct sctp_transport *transport; | |
1050 | union sctp_addr to; | |
3f7a87d2 FF |
1051 | sctp_scope_t scope; |
1052 | long timeo; | |
1053 | int err = 0; | |
1054 | int addrcnt = 0; | |
1055 | int walk_size = 0; | |
e4d1feab | 1056 | union sctp_addr *sa_addr = NULL; |
3f7a87d2 | 1057 | void *addr_buf; |
16d00fb7 | 1058 | unsigned short port; |
f50f95ca | 1059 | unsigned int f_flags = 0; |
3f7a87d2 FF |
1060 | |
1061 | sp = sctp_sk(sk); | |
1062 | ep = sp->ep; | |
1063 | ||
1064 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
1065 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1066 | * is already connected. | |
1067 | * It cannot be done even on a TCP-style listening socket. | |
1068 | */ | |
1069 | if (sctp_sstate(sk, ESTABLISHED) || | |
1070 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1071 | err = -EISCONN; | |
1072 | goto out_free; | |
1073 | } | |
1074 | ||
1075 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1076 | addr_buf = kaddrs; | |
1077 | while (walk_size < addrs_size) { | |
299ee123 JG |
1078 | struct sctp_af *af; |
1079 | ||
d7e0d19a DR |
1080 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
1081 | err = -EINVAL; | |
1082 | goto out_free; | |
1083 | } | |
1084 | ||
ea110733 | 1085 | sa_addr = addr_buf; |
4bdf4b5f | 1086 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
3f7a87d2 FF |
1087 | |
1088 | /* If the address family is not supported or if this address | |
1089 | * causes the address buffer to overflow return EINVAL. | |
1090 | */ | |
1091 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1092 | err = -EINVAL; | |
1093 | goto out_free; | |
1094 | } | |
1095 | ||
d7e0d19a DR |
1096 | port = ntohs(sa_addr->v4.sin_port); |
1097 | ||
e4d1feab VY |
1098 | /* Save current address so we can work with it */ |
1099 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1100 | ||
1101 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
3f7a87d2 FF |
1102 | if (err) |
1103 | goto out_free; | |
1104 | ||
16d00fb7 VY |
1105 | /* Make sure the destination port is correctly set |
1106 | * in all addresses. | |
1107 | */ | |
524fba6c WY |
1108 | if (asoc && asoc->peer.port && asoc->peer.port != port) { |
1109 | err = -EINVAL; | |
16d00fb7 | 1110 | goto out_free; |
524fba6c | 1111 | } |
3f7a87d2 FF |
1112 | |
1113 | /* Check if there already is a matching association on the | |
1114 | * endpoint (other than the one created here). | |
1115 | */ | |
e4d1feab | 1116 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1117 | if (asoc2 && asoc2 != asoc) { |
1118 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1119 | err = -EISCONN; | |
1120 | else | |
1121 | err = -EALREADY; | |
1122 | goto out_free; | |
1123 | } | |
1124 | ||
1125 | /* If we could not find a matching association on the endpoint, | |
1126 | * make sure that there is no peeled-off association matching | |
1127 | * the peer address even on another socket. | |
1128 | */ | |
e4d1feab | 1129 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1130 | err = -EADDRNOTAVAIL; |
1131 | goto out_free; | |
1132 | } | |
1133 | ||
1134 | if (!asoc) { | |
1135 | /* If a bind() or sctp_bindx() is not called prior to | |
1136 | * an sctp_connectx() call, the system picks an | |
1137 | * ephemeral port and will choose an address set | |
1138 | * equivalent to binding with a wildcard address. | |
1139 | */ | |
1140 | if (!ep->base.bind_addr.port) { | |
1141 | if (sctp_autobind(sk)) { | |
1142 | err = -EAGAIN; | |
1143 | goto out_free; | |
1144 | } | |
64a0c1c8 ISJ |
1145 | } else { |
1146 | /* | |
d808ad9a YH |
1147 | * If an unprivileged user inherits a 1-many |
1148 | * style socket with open associations on a | |
1149 | * privileged port, it MAY be permitted to | |
1150 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1151 | * be permitted to open new associations. |
1152 | */ | |
1153 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1154 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1155 | err = -EACCES; |
1156 | goto out_free; | |
1157 | } | |
3f7a87d2 FF |
1158 | } |
1159 | ||
e4d1feab | 1160 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1161 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1162 | if (!asoc) { | |
1163 | err = -ENOMEM; | |
1164 | goto out_free; | |
1165 | } | |
409b95af VY |
1166 | |
1167 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1168 | GFP_KERNEL); | |
1169 | if (err < 0) { | |
1170 | goto out_free; | |
1171 | } | |
1172 | ||
3f7a87d2 FF |
1173 | } |
1174 | ||
1175 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1176 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1177 | SCTP_UNKNOWN); |
1178 | if (!transport) { | |
1179 | err = -ENOMEM; | |
1180 | goto out_free; | |
1181 | } | |
1182 | ||
1183 | addrcnt++; | |
1184 | addr_buf += af->sockaddr_len; | |
1185 | walk_size += af->sockaddr_len; | |
1186 | } | |
1187 | ||
c6ba68a2 VY |
1188 | /* In case the user of sctp_connectx() wants an association |
1189 | * id back, assign one now. | |
1190 | */ | |
1191 | if (assoc_id) { | |
1192 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1193 | if (err < 0) | |
1194 | goto out_free; | |
1195 | } | |
1196 | ||
55e26eb9 | 1197 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
3f7a87d2 FF |
1198 | if (err < 0) { |
1199 | goto out_free; | |
1200 | } | |
1201 | ||
1202 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1203 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
299ee123 | 1204 | sp->pf->to_sk_daddr(sa_addr, sk); |
8de8c873 | 1205 | sk->sk_err = 0; |
3f7a87d2 | 1206 | |
f50f95ca VY |
1207 | /* in-kernel sockets don't generally have a file allocated to them |
1208 | * if all they do is call sock_create_kern(). | |
1209 | */ | |
1210 | if (sk->sk_socket->file) | |
1211 | f_flags = sk->sk_socket->file->f_flags; | |
1212 | ||
1213 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1214 | ||
3f7a87d2 | 1215 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1216 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1217 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1218 | |
1219 | /* Don't free association on exit. */ | |
1220 | asoc = NULL; | |
1221 | ||
1222 | out_free: | |
bb33381d DB |
1223 | pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n", |
1224 | __func__, asoc, kaddrs, err); | |
3f7a87d2 | 1225 | |
2eebc1e1 NH |
1226 | if (asoc) { |
1227 | /* sctp_primitive_ASSOCIATE may have added this association | |
1228 | * To the hash table, try to unhash it, just in case, its a noop | |
1229 | * if it wasn't hashed so we're safe | |
1230 | */ | |
3f7a87d2 | 1231 | sctp_association_free(asoc); |
2eebc1e1 | 1232 | } |
3f7a87d2 FF |
1233 | return err; |
1234 | } | |
1235 | ||
1236 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1237 | * | |
1238 | * API 8.9 | |
88a0a948 VY |
1239 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1240 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1241 | * |
1242 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1243 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1244 | * or IPv6 addresses. | |
1245 | * | |
1246 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1247 | * Section 3.1.2 for this usage. | |
1248 | * | |
1249 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1250 | * address is contained in its appropriate structure (i.e. struct | |
1251 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1252 | * must be used to distengish the address length (note that this | |
1253 | * representation is termed a "packed array" of addresses). The caller | |
1254 | * specifies the number of addresses in the array with addrcnt. | |
1255 | * | |
88a0a948 VY |
1256 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1257 | * the association id of the new association. On failure, sctp_connectx() | |
1258 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1259 | * is not touched by the kernel. | |
3f7a87d2 FF |
1260 | * |
1261 | * For SCTP, the port given in each socket address must be the same, or | |
1262 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1263 | * | |
1264 | * An application can use sctp_connectx to initiate an association with | |
1265 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1266 | * allows a caller to specify multiple addresses at which a peer can be | |
1267 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1268 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1269 | * specifies that the stack will try to make use of all the addresses in |
1270 | * the list when needed. | |
1271 | * | |
1272 | * Note that the list of addresses passed in is only used for setting up | |
1273 | * the association. It does not necessarily equal the set of addresses | |
1274 | * the peer uses for the resulting association. If the caller wants to | |
1275 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1276 | * retrieve them after the association has been set up. | |
1277 | * | |
1278 | * Basically do nothing but copying the addresses from user to kernel | |
1279 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1280 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1281 | * | |
1282 | * We don't use copy_from_user() for optimization: we first do the | |
1283 | * sanity checks (buffer size -fast- and access check-healthy | |
1284 | * pointer); if all of those succeed, then we can alloc the memory | |
1285 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1286 | * the copying without checking the user space area | |
1287 | * (__copy_from_user()). | |
1288 | * | |
1289 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1290 | * it. | |
1291 | * | |
1292 | * sk The sk of the socket | |
1293 | * addrs The pointer to the addresses in user land | |
1294 | * addrssize Size of the addrs buffer | |
1295 | * | |
88a0a948 | 1296 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1297 | */ |
26ac8e5f | 1298 | static int __sctp_setsockopt_connectx(struct sock *sk, |
3f7a87d2 | 1299 | struct sockaddr __user *addrs, |
88a0a948 VY |
1300 | int addrs_size, |
1301 | sctp_assoc_t *assoc_id) | |
3f7a87d2 | 1302 | { |
3f7a87d2 | 1303 | struct sockaddr *kaddrs; |
9ba0b963 MRL |
1304 | gfp_t gfp = GFP_KERNEL; |
1305 | int err = 0; | |
3f7a87d2 | 1306 | |
bb33381d DB |
1307 | pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n", |
1308 | __func__, sk, addrs, addrs_size); | |
3f7a87d2 FF |
1309 | |
1310 | if (unlikely(addrs_size <= 0)) | |
1311 | return -EINVAL; | |
1312 | ||
1313 | /* Check the user passed a healthy pointer. */ | |
1314 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1315 | return -EFAULT; | |
1316 | ||
1317 | /* Alloc space for the address array in kernel memory. */ | |
9ba0b963 MRL |
1318 | if (sk->sk_socket->file) |
1319 | gfp = GFP_USER | __GFP_NOWARN; | |
1320 | kaddrs = kmalloc(addrs_size, gfp); | |
3f7a87d2 FF |
1321 | if (unlikely(!kaddrs)) |
1322 | return -ENOMEM; | |
1323 | ||
1324 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1325 | err = -EFAULT; | |
1326 | } else { | |
88a0a948 | 1327 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1328 | } |
1329 | ||
1330 | kfree(kaddrs); | |
88a0a948 | 1331 | |
3f7a87d2 FF |
1332 | return err; |
1333 | } | |
1334 | ||
88a0a948 VY |
1335 | /* |
1336 | * This is an older interface. It's kept for backward compatibility | |
1337 | * to the option that doesn't provide association id. | |
1338 | */ | |
26ac8e5f | 1339 | static int sctp_setsockopt_connectx_old(struct sock *sk, |
dda91928 DB |
1340 | struct sockaddr __user *addrs, |
1341 | int addrs_size) | |
88a0a948 VY |
1342 | { |
1343 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * New interface for the API. The since the API is done with a socket | |
1348 | * option, to make it simple we feed back the association id is as a return | |
1349 | * indication to the call. Error is always negative and association id is | |
1350 | * always positive. | |
1351 | */ | |
26ac8e5f | 1352 | static int sctp_setsockopt_connectx(struct sock *sk, |
dda91928 DB |
1353 | struct sockaddr __user *addrs, |
1354 | int addrs_size) | |
88a0a948 VY |
1355 | { |
1356 | sctp_assoc_t assoc_id = 0; | |
1357 | int err = 0; | |
1358 | ||
1359 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1360 | ||
1361 | if (err) | |
1362 | return err; | |
1363 | else | |
1364 | return assoc_id; | |
1365 | } | |
1366 | ||
c6ba68a2 | 1367 | /* |
f9c67811 VY |
1368 | * New (hopefully final) interface for the API. |
1369 | * We use the sctp_getaddrs_old structure so that use-space library | |
ffd59393 | 1370 | * can avoid any unnecessary allocations. The only different part |
f9c67811 | 1371 | * is that we store the actual length of the address buffer into the |
ffd59393 | 1372 | * addrs_num structure member. That way we can re-use the existing |
f9c67811 | 1373 | * code. |
c6ba68a2 | 1374 | */ |
ffd59393 DB |
1375 | #ifdef CONFIG_COMPAT |
1376 | struct compat_sctp_getaddrs_old { | |
1377 | sctp_assoc_t assoc_id; | |
1378 | s32 addr_num; | |
1379 | compat_uptr_t addrs; /* struct sockaddr * */ | |
1380 | }; | |
1381 | #endif | |
1382 | ||
26ac8e5f | 1383 | static int sctp_getsockopt_connectx3(struct sock *sk, int len, |
dda91928 DB |
1384 | char __user *optval, |
1385 | int __user *optlen) | |
c6ba68a2 | 1386 | { |
f9c67811 | 1387 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1388 | sctp_assoc_t assoc_id = 0; |
1389 | int err = 0; | |
1390 | ||
ffd59393 DB |
1391 | #ifdef CONFIG_COMPAT |
1392 | if (is_compat_task()) { | |
1393 | struct compat_sctp_getaddrs_old param32; | |
c6ba68a2 | 1394 | |
ffd59393 DB |
1395 | if (len < sizeof(param32)) |
1396 | return -EINVAL; | |
1397 | if (copy_from_user(¶m32, optval, sizeof(param32))) | |
1398 | return -EFAULT; | |
f9c67811 | 1399 | |
ffd59393 DB |
1400 | param.assoc_id = param32.assoc_id; |
1401 | param.addr_num = param32.addr_num; | |
1402 | param.addrs = compat_ptr(param32.addrs); | |
1403 | } else | |
1404 | #endif | |
1405 | { | |
1406 | if (len < sizeof(param)) | |
1407 | return -EINVAL; | |
1408 | if (copy_from_user(¶m, optval, sizeof(param))) | |
1409 | return -EFAULT; | |
1410 | } | |
c6ba68a2 | 1411 | |
ffd59393 DB |
1412 | err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *) |
1413 | param.addrs, param.addr_num, | |
1414 | &assoc_id); | |
c6ba68a2 VY |
1415 | if (err == 0 || err == -EINPROGRESS) { |
1416 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1417 | return -EFAULT; | |
1418 | if (put_user(sizeof(assoc_id), optlen)) | |
1419 | return -EFAULT; | |
1420 | } | |
1421 | ||
1422 | return err; | |
1423 | } | |
1424 | ||
1da177e4 LT |
1425 | /* API 3.1.4 close() - UDP Style Syntax |
1426 | * Applications use close() to perform graceful shutdown (as described in | |
1427 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1428 | * by a UDP-style socket. | |
1429 | * | |
1430 | * The syntax is | |
1431 | * | |
1432 | * ret = close(int sd); | |
1433 | * | |
1434 | * sd - the socket descriptor of the associations to be closed. | |
1435 | * | |
1436 | * To gracefully shutdown a specific association represented by the | |
1437 | * UDP-style socket, an application should use the sendmsg() call, | |
1438 | * passing no user data, but including the appropriate flag in the | |
1439 | * ancillary data (see Section xxxx). | |
1440 | * | |
1441 | * If sd in the close() call is a branched-off socket representing only | |
1442 | * one association, the shutdown is performed on that association only. | |
1443 | * | |
1444 | * 4.1.6 close() - TCP Style Syntax | |
1445 | * | |
1446 | * Applications use close() to gracefully close down an association. | |
1447 | * | |
1448 | * The syntax is: | |
1449 | * | |
1450 | * int close(int sd); | |
1451 | * | |
1452 | * sd - the socket descriptor of the association to be closed. | |
1453 | * | |
1454 | * After an application calls close() on a socket descriptor, no further | |
1455 | * socket operations will succeed on that descriptor. | |
1456 | * | |
1457 | * API 7.1.4 SO_LINGER | |
1458 | * | |
1459 | * An application using the TCP-style socket can use this option to | |
1460 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1461 | * | |
1462 | * struct linger { | |
1463 | * int l_onoff; // option on/off | |
1464 | * int l_linger; // linger time | |
1465 | * }; | |
1466 | * | |
1467 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1468 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1469 | * value is set to a negative value, the setsockopt() call will return | |
1470 | * an error. If the value is set to a positive value linger_time, the | |
1471 | * close() can be blocked for at most linger_time ms. If the graceful | |
1472 | * shutdown phase does not finish during this period, close() will | |
1473 | * return but the graceful shutdown phase continues in the system. | |
1474 | */ | |
dda91928 | 1475 | static void sctp_close(struct sock *sk, long timeout) |
1da177e4 | 1476 | { |
55e26eb9 | 1477 | struct net *net = sock_net(sk); |
1da177e4 LT |
1478 | struct sctp_endpoint *ep; |
1479 | struct sctp_association *asoc; | |
1480 | struct list_head *pos, *temp; | |
cd4fcc70 | 1481 | unsigned int data_was_unread; |
1da177e4 | 1482 | |
bb33381d | 1483 | pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout); |
1da177e4 | 1484 | |
048ed4b6 | 1485 | lock_sock(sk); |
1da177e4 | 1486 | sk->sk_shutdown = SHUTDOWN_MASK; |
bec9640b | 1487 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1488 | |
1489 | ep = sctp_sk(sk)->ep; | |
1490 | ||
cd4fcc70 TG |
1491 | /* Clean up any skbs sitting on the receive queue. */ |
1492 | data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1493 | data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1494 | ||
61c9fed4 | 1495 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1496 | list_for_each_safe(pos, temp, &ep->asocs) { |
1497 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1498 | ||
1499 | if (sctp_style(sk, TCP)) { | |
1500 | /* A closed association can still be in the list if | |
1501 | * it belongs to a TCP-style listening socket that is | |
1502 | * not yet accepted. If so, free it. If not, send an | |
1503 | * ABORT or SHUTDOWN based on the linger options. | |
1504 | */ | |
1505 | if (sctp_state(asoc, CLOSED)) { | |
1da177e4 | 1506 | sctp_association_free(asoc); |
b89498a1 VY |
1507 | continue; |
1508 | } | |
1509 | } | |
1da177e4 | 1510 | |
cd4fcc70 TG |
1511 | if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) || |
1512 | !skb_queue_empty(&asoc->ulpq.reasm) || | |
1513 | (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) { | |
b9ac8672 SS |
1514 | struct sctp_chunk *chunk; |
1515 | ||
1516 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
068d8bd3 | 1517 | sctp_primitive_ABORT(net, asoc, chunk); |
b9ac8672 | 1518 | } else |
55e26eb9 | 1519 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1520 | } |
1521 | ||
1da177e4 LT |
1522 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1523 | if (sctp_style(sk, TCP) && timeout) | |
1524 | sctp_wait_for_close(sk, timeout); | |
1525 | ||
1526 | /* This will run the backlog queue. */ | |
048ed4b6 | 1527 | release_sock(sk); |
1da177e4 LT |
1528 | |
1529 | /* Supposedly, no process has access to the socket, but | |
1530 | * the net layers still may. | |
2d45a02d MRL |
1531 | * Also, sctp_destroy_sock() needs to be called with addr_wq_lock |
1532 | * held and that should be grabbed before socket lock. | |
1da177e4 | 1533 | */ |
2d45a02d | 1534 | spin_lock_bh(&net->sctp.addr_wq_lock); |
5bc1d1b4 | 1535 | bh_lock_sock(sk); |
1da177e4 LT |
1536 | |
1537 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1538 | * and we have just a little more cleanup. | |
1539 | */ | |
1540 | sock_hold(sk); | |
1541 | sk_common_release(sk); | |
1542 | ||
5bc1d1b4 | 1543 | bh_unlock_sock(sk); |
2d45a02d | 1544 | spin_unlock_bh(&net->sctp.addr_wq_lock); |
1da177e4 LT |
1545 | |
1546 | sock_put(sk); | |
1547 | ||
1548 | SCTP_DBG_OBJCNT_DEC(sock); | |
1549 | } | |
1550 | ||
1551 | /* Handle EPIPE error. */ | |
1552 | static int sctp_error(struct sock *sk, int flags, int err) | |
1553 | { | |
1554 | if (err == -EPIPE) | |
1555 | err = sock_error(sk) ? : -EPIPE; | |
1556 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1557 | send_sig(SIGPIPE, current, 0); | |
1558 | return err; | |
1559 | } | |
1560 | ||
1561 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1562 | * | |
1563 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1564 | * and receive data from its peer. | |
1565 | * | |
1566 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1567 | * int flags); | |
1568 | * | |
1569 | * socket - the socket descriptor of the endpoint. | |
1570 | * message - pointer to the msghdr structure which contains a single | |
1571 | * user message and possibly some ancillary data. | |
1572 | * | |
1573 | * See Section 5 for complete description of the data | |
1574 | * structures. | |
1575 | * | |
1576 | * flags - flags sent or received with the user message, see Section | |
1577 | * 5 for complete description of the flags. | |
1578 | * | |
1579 | * Note: This function could use a rewrite especially when explicit | |
1580 | * connect support comes in. | |
1581 | */ | |
1582 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1583 | ||
dda91928 | 1584 | static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); |
1da177e4 | 1585 | |
1b784140 | 1586 | static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len) |
1da177e4 | 1587 | { |
55e26eb9 | 1588 | struct net *net = sock_net(sk); |
1da177e4 LT |
1589 | struct sctp_sock *sp; |
1590 | struct sctp_endpoint *ep; | |
cb3f837b | 1591 | struct sctp_association *new_asoc = NULL, *asoc = NULL; |
1da177e4 LT |
1592 | struct sctp_transport *transport, *chunk_tp; |
1593 | struct sctp_chunk *chunk; | |
dce116ae | 1594 | union sctp_addr to; |
1da177e4 | 1595 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1596 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1597 | struct sctp_sndrcvinfo *sinfo; |
1598 | struct sctp_initmsg *sinit; | |
1599 | sctp_assoc_t associd = 0; | |
1600 | sctp_cmsgs_t cmsgs = { NULL }; | |
1da177e4 | 1601 | sctp_scope_t scope; |
2061dcd6 | 1602 | bool fill_sinfo_ttl = false, wait_connect = false; |
1da177e4 | 1603 | struct sctp_datamsg *datamsg; |
1da177e4 | 1604 | int msg_flags = msg->msg_flags; |
63b94938 GOV |
1605 | __u16 sinfo_flags = 0; |
1606 | long timeo; | |
1607 | int err; | |
1da177e4 | 1608 | |
1da177e4 LT |
1609 | err = 0; |
1610 | sp = sctp_sk(sk); | |
1611 | ep = sp->ep; | |
1612 | ||
bb33381d DB |
1613 | pr_debug("%s: sk:%p, msg:%p, msg_len:%zu ep:%p\n", __func__, sk, |
1614 | msg, msg_len, ep); | |
1da177e4 LT |
1615 | |
1616 | /* We cannot send a message over a TCP-style listening socket. */ | |
1617 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1618 | err = -EPIPE; | |
1619 | goto out_nounlock; | |
1620 | } | |
1621 | ||
1622 | /* Parse out the SCTP CMSGs. */ | |
1623 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1da177e4 | 1624 | if (err) { |
bb33381d | 1625 | pr_debug("%s: msghdr parse err:%x\n", __func__, err); |
1da177e4 LT |
1626 | goto out_nounlock; |
1627 | } | |
1628 | ||
1629 | /* Fetch the destination address for this packet. This | |
1630 | * address only selects the association--it is not necessarily | |
1631 | * the address we will send to. | |
1632 | * For a peeled-off socket, msg_name is ignored. | |
1633 | */ | |
1634 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1635 | int msg_namelen = msg->msg_namelen; | |
1636 | ||
1637 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1638 | msg_namelen); | |
1639 | if (err) | |
1640 | return err; | |
1641 | ||
1642 | if (msg_namelen > sizeof(to)) | |
1643 | msg_namelen = sizeof(to); | |
1644 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1645 | msg_name = msg->msg_name; |
1646 | } | |
1647 | ||
1da177e4 | 1648 | sinit = cmsgs.init; |
63b94938 GOV |
1649 | if (cmsgs.sinfo != NULL) { |
1650 | memset(&default_sinfo, 0, sizeof(default_sinfo)); | |
1651 | default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid; | |
1652 | default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags; | |
1653 | default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid; | |
1654 | default_sinfo.sinfo_context = cmsgs.sinfo->snd_context; | |
1655 | default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id; | |
1da177e4 | 1656 | |
63b94938 GOV |
1657 | sinfo = &default_sinfo; |
1658 | fill_sinfo_ttl = true; | |
1659 | } else { | |
1660 | sinfo = cmsgs.srinfo; | |
1661 | } | |
1662 | /* Did the user specify SNDINFO/SNDRCVINFO? */ | |
1da177e4 LT |
1663 | if (sinfo) { |
1664 | sinfo_flags = sinfo->sinfo_flags; | |
1665 | associd = sinfo->sinfo_assoc_id; | |
1666 | } | |
1667 | ||
bb33381d DB |
1668 | pr_debug("%s: msg_len:%zu, sinfo_flags:0x%x\n", __func__, |
1669 | msg_len, sinfo_flags); | |
1da177e4 | 1670 | |
eaa5c54d ISJ |
1671 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1672 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1673 | err = -EINVAL; |
1674 | goto out_nounlock; | |
1675 | } | |
1676 | ||
eaa5c54d ISJ |
1677 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1678 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1679 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1680 | * the msg_iov set to the user abort reason. |
d808ad9a | 1681 | */ |
eaa5c54d ISJ |
1682 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1683 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1684 | err = -EINVAL; |
1685 | goto out_nounlock; | |
1686 | } | |
1687 | ||
eaa5c54d | 1688 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1689 | * specified in msg_name. |
1690 | */ | |
eaa5c54d | 1691 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1692 | err = -EINVAL; |
1693 | goto out_nounlock; | |
1694 | } | |
1695 | ||
1696 | transport = NULL; | |
1697 | ||
bb33381d | 1698 | pr_debug("%s: about to look up association\n", __func__); |
1da177e4 | 1699 | |
048ed4b6 | 1700 | lock_sock(sk); |
1da177e4 LT |
1701 | |
1702 | /* If a msg_name has been specified, assume this is to be used. */ | |
1703 | if (msg_name) { | |
1704 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1705 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1706 | if (!asoc) { |
1707 | /* If we could not find a matching association on the | |
1708 | * endpoint, make sure that it is not a TCP-style | |
1709 | * socket that already has an association or there is | |
1710 | * no peeled-off association on another socket. | |
1711 | */ | |
1712 | if ((sctp_style(sk, TCP) && | |
1713 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1714 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1715 | err = -EADDRNOTAVAIL; |
1716 | goto out_unlock; | |
1717 | } | |
1718 | } | |
1719 | } else { | |
1720 | asoc = sctp_id2assoc(sk, associd); | |
1721 | if (!asoc) { | |
1722 | err = -EPIPE; | |
1723 | goto out_unlock; | |
1724 | } | |
1725 | } | |
1726 | ||
1727 | if (asoc) { | |
bb33381d | 1728 | pr_debug("%s: just looked up association:%p\n", __func__, asoc); |
1da177e4 LT |
1729 | |
1730 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1731 | * socket that has an association in CLOSED state. This can | |
1732 | * happen when an accepted socket has an association that is | |
1733 | * already CLOSED. | |
1734 | */ | |
1735 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1736 | err = -EPIPE; | |
1737 | goto out_unlock; | |
1738 | } | |
1739 | ||
eaa5c54d | 1740 | if (sinfo_flags & SCTP_EOF) { |
bb33381d DB |
1741 | pr_debug("%s: shutting down association:%p\n", |
1742 | __func__, asoc); | |
1743 | ||
55e26eb9 | 1744 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1745 | err = 0; |
1746 | goto out_unlock; | |
1747 | } | |
eaa5c54d | 1748 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1749 | |
1750 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1751 | if (!chunk) { | |
1752 | err = -ENOMEM; | |
1753 | goto out_unlock; | |
1754 | } | |
1755 | ||
bb33381d DB |
1756 | pr_debug("%s: aborting association:%p\n", |
1757 | __func__, asoc); | |
1758 | ||
55e26eb9 | 1759 | sctp_primitive_ABORT(net, asoc, chunk); |
1da177e4 LT |
1760 | err = 0; |
1761 | goto out_unlock; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | /* Do we need to create the association? */ | |
1766 | if (!asoc) { | |
bb33381d | 1767 | pr_debug("%s: there is no association yet\n", __func__); |
1da177e4 | 1768 | |
eaa5c54d | 1769 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1770 | err = -EINVAL; |
1771 | goto out_unlock; | |
1772 | } | |
1773 | ||
1774 | /* Check for invalid stream against the stream counts, | |
1775 | * either the default or the user specified stream counts. | |
1776 | */ | |
1777 | if (sinfo) { | |
0e864b21 | 1778 | if (!sinit || !sinit->sinit_num_ostreams) { |
1da177e4 LT |
1779 | /* Check against the defaults. */ |
1780 | if (sinfo->sinfo_stream >= | |
1781 | sp->initmsg.sinit_num_ostreams) { | |
1782 | err = -EINVAL; | |
1783 | goto out_unlock; | |
1784 | } | |
1785 | } else { | |
1786 | /* Check against the requested. */ | |
1787 | if (sinfo->sinfo_stream >= | |
1788 | sinit->sinit_num_ostreams) { | |
1789 | err = -EINVAL; | |
1790 | goto out_unlock; | |
1791 | } | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * API 3.1.2 bind() - UDP Style Syntax | |
1797 | * If a bind() or sctp_bindx() is not called prior to a | |
1798 | * sendmsg() call that initiates a new association, the | |
1799 | * system picks an ephemeral port and will choose an address | |
1800 | * set equivalent to binding with a wildcard address. | |
1801 | */ | |
1802 | if (!ep->base.bind_addr.port) { | |
1803 | if (sctp_autobind(sk)) { | |
1804 | err = -EAGAIN; | |
1805 | goto out_unlock; | |
1806 | } | |
64a0c1c8 ISJ |
1807 | } else { |
1808 | /* | |
1809 | * If an unprivileged user inherits a one-to-many | |
1810 | * style socket with open associations on a privileged | |
1811 | * port, it MAY be permitted to accept new associations, | |
1812 | * but it SHOULD NOT be permitted to open new | |
1813 | * associations. | |
1814 | */ | |
1815 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1816 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1817 | err = -EACCES; |
1818 | goto out_unlock; | |
1819 | } | |
1da177e4 LT |
1820 | } |
1821 | ||
1822 | scope = sctp_scope(&to); | |
1823 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1824 | if (!new_asoc) { | |
1825 | err = -ENOMEM; | |
1826 | goto out_unlock; | |
1827 | } | |
1828 | asoc = new_asoc; | |
409b95af VY |
1829 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1830 | if (err < 0) { | |
1831 | err = -ENOMEM; | |
1832 | goto out_free; | |
1833 | } | |
1da177e4 LT |
1834 | |
1835 | /* If the SCTP_INIT ancillary data is specified, set all | |
1836 | * the association init values accordingly. | |
1837 | */ | |
1838 | if (sinit) { | |
1839 | if (sinit->sinit_num_ostreams) { | |
1840 | asoc->c.sinit_num_ostreams = | |
1841 | sinit->sinit_num_ostreams; | |
1842 | } | |
1843 | if (sinit->sinit_max_instreams) { | |
1844 | asoc->c.sinit_max_instreams = | |
1845 | sinit->sinit_max_instreams; | |
1846 | } | |
1847 | if (sinit->sinit_max_attempts) { | |
1848 | asoc->max_init_attempts | |
1849 | = sinit->sinit_max_attempts; | |
1850 | } | |
1851 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1852 | asoc->max_init_timeo = |
1da177e4 LT |
1853 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1854 | } | |
1855 | } | |
1856 | ||
1857 | /* Prime the peer's transport structures. */ | |
dce116ae | 1858 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1859 | if (!transport) { |
1860 | err = -ENOMEM; | |
1861 | goto out_free; | |
1862 | } | |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | /* ASSERT: we have a valid association at this point. */ | |
bb33381d | 1866 | pr_debug("%s: we have a valid association\n", __func__); |
1da177e4 LT |
1867 | |
1868 | if (!sinfo) { | |
63b94938 GOV |
1869 | /* If the user didn't specify SNDINFO/SNDRCVINFO, make up |
1870 | * one with some defaults. | |
1da177e4 | 1871 | */ |
517aa0bc | 1872 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1873 | default_sinfo.sinfo_stream = asoc->default_stream; |
1874 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1875 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1876 | default_sinfo.sinfo_context = asoc->default_context; | |
1877 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1878 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
63b94938 | 1879 | |
1da177e4 | 1880 | sinfo = &default_sinfo; |
63b94938 GOV |
1881 | } else if (fill_sinfo_ttl) { |
1882 | /* In case SNDINFO was specified, we still need to fill | |
1883 | * it with a default ttl from the assoc here. | |
1884 | */ | |
1885 | sinfo->sinfo_timetolive = asoc->default_timetolive; | |
1da177e4 LT |
1886 | } |
1887 | ||
1888 | /* API 7.1.7, the sndbuf size per association bounds the | |
1889 | * maximum size of data that can be sent in a single send call. | |
1890 | */ | |
1891 | if (msg_len > sk->sk_sndbuf) { | |
1892 | err = -EMSGSIZE; | |
1893 | goto out_free; | |
1894 | } | |
1895 | ||
8a479491 | 1896 | if (asoc->pmtu_pending) |
02f3d4ce | 1897 | sctp_assoc_pending_pmtu(sk, asoc); |
8a479491 | 1898 | |
1da177e4 LT |
1899 | /* If fragmentation is disabled and the message length exceeds the |
1900 | * association fragmentation point, return EMSGSIZE. The I-D | |
1901 | * does not specify what this error is, but this looks like | |
1902 | * a great fit. | |
1903 | */ | |
1904 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1905 | err = -EMSGSIZE; | |
1906 | goto out_free; | |
1907 | } | |
1908 | ||
afd7614c JP |
1909 | /* Check for invalid stream. */ |
1910 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1911 | err = -EINVAL; | |
1912 | goto out_free; | |
1da177e4 LT |
1913 | } |
1914 | ||
1915 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1916 | if (!sctp_wspace(asoc)) { | |
1917 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1918 | if (err) | |
1919 | goto out_free; | |
1920 | } | |
1921 | ||
1922 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1923 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1924 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1925 | */ |
1926 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1927 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1928 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1929 | if (!chunk_tp) { |
1930 | err = -EINVAL; | |
1931 | goto out_free; | |
1932 | } | |
1933 | } else | |
1934 | chunk_tp = NULL; | |
1935 | ||
1936 | /* Auto-connect, if we aren't connected already. */ | |
1937 | if (sctp_state(asoc, CLOSED)) { | |
55e26eb9 | 1938 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
1da177e4 LT |
1939 | if (err < 0) |
1940 | goto out_free; | |
bb33381d | 1941 | |
2061dcd6 | 1942 | wait_connect = true; |
bb33381d | 1943 | pr_debug("%s: we associated primitively\n", __func__); |
1da177e4 LT |
1944 | } |
1945 | ||
1946 | /* Break the message into multiple chunks of maximum size. */ | |
c0371da6 | 1947 | datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter); |
6e51fe75 TR |
1948 | if (IS_ERR(datamsg)) { |
1949 | err = PTR_ERR(datamsg); | |
1da177e4 LT |
1950 | goto out_free; |
1951 | } | |
1952 | ||
1953 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1954 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
1da177e4 LT |
1955 | /* Do accounting for the write space. */ |
1956 | sctp_set_owner_w(chunk); | |
1957 | ||
1958 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1959 | } |
1960 | ||
9c5c62be VY |
1961 | /* Send it to the lower layers. Note: all chunks |
1962 | * must either fail or succeed. The lower layer | |
1963 | * works that way today. Keep it that way or this | |
1964 | * breaks. | |
1965 | */ | |
55e26eb9 | 1966 | err = sctp_primitive_SEND(net, asoc, datamsg); |
8b570dc9 | 1967 | sctp_datamsg_put(datamsg); |
9c5c62be | 1968 | /* Did the lower layer accept the chunk? */ |
8b570dc9 | 1969 | if (err) |
bb33381d | 1970 | goto out_free; |
9c5c62be | 1971 | |
bb33381d | 1972 | pr_debug("%s: we sent primitively\n", __func__); |
9c5c62be | 1973 | |
bb33381d | 1974 | err = msg_len; |
1da177e4 | 1975 | |
2061dcd6 DB |
1976 | if (unlikely(wait_connect)) { |
1977 | timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT); | |
1978 | sctp_wait_for_connect(asoc, &timeo); | |
1979 | } | |
1980 | ||
1da177e4 LT |
1981 | /* If we are already past ASSOCIATE, the lower |
1982 | * layers are responsible for association cleanup. | |
1983 | */ | |
1984 | goto out_unlock; | |
1985 | ||
1986 | out_free: | |
b5eff712 | 1987 | if (new_asoc) |
1da177e4 LT |
1988 | sctp_association_free(asoc); |
1989 | out_unlock: | |
048ed4b6 | 1990 | release_sock(sk); |
1da177e4 LT |
1991 | |
1992 | out_nounlock: | |
1993 | return sctp_error(sk, msg_flags, err); | |
1994 | ||
1995 | #if 0 | |
1996 | do_sock_err: | |
1997 | if (msg_len) | |
1998 | err = msg_len; | |
1999 | else | |
2000 | err = sock_error(sk); | |
2001 | goto out; | |
2002 | ||
2003 | do_interrupted: | |
2004 | if (msg_len) | |
2005 | err = msg_len; | |
2006 | goto out; | |
2007 | #endif /* 0 */ | |
2008 | } | |
2009 | ||
2010 | /* This is an extended version of skb_pull() that removes the data from the | |
2011 | * start of a skb even when data is spread across the list of skb's in the | |
2012 | * frag_list. len specifies the total amount of data that needs to be removed. | |
2013 | * when 'len' bytes could be removed from the skb, it returns 0. | |
2014 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
2015 | * could not be removed. | |
2016 | */ | |
2017 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
2018 | { | |
2019 | struct sk_buff *list; | |
2020 | int skb_len = skb_headlen(skb); | |
2021 | int rlen; | |
2022 | ||
2023 | if (len <= skb_len) { | |
2024 | __skb_pull(skb, len); | |
2025 | return 0; | |
2026 | } | |
2027 | len -= skb_len; | |
2028 | __skb_pull(skb, skb_len); | |
2029 | ||
1b003be3 | 2030 | skb_walk_frags(skb, list) { |
1da177e4 LT |
2031 | rlen = sctp_skb_pull(list, len); |
2032 | skb->len -= (len-rlen); | |
2033 | skb->data_len -= (len-rlen); | |
2034 | ||
2035 | if (!rlen) | |
2036 | return 0; | |
2037 | ||
2038 | len = rlen; | |
2039 | } | |
2040 | ||
2041 | return len; | |
2042 | } | |
2043 | ||
2044 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
2045 | * | |
2046 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
2047 | * int flags); | |
2048 | * | |
2049 | * socket - the socket descriptor of the endpoint. | |
2050 | * message - pointer to the msghdr structure which contains a single | |
2051 | * user message and possibly some ancillary data. | |
2052 | * | |
2053 | * See Section 5 for complete description of the data | |
2054 | * structures. | |
2055 | * | |
2056 | * flags - flags sent or received with the user message, see Section | |
2057 | * 5 for complete description of the flags. | |
2058 | */ | |
1b784140 YX |
2059 | static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
2060 | int noblock, int flags, int *addr_len) | |
1da177e4 LT |
2061 | { |
2062 | struct sctp_ulpevent *event = NULL; | |
2063 | struct sctp_sock *sp = sctp_sk(sk); | |
2064 | struct sk_buff *skb; | |
2065 | int copied; | |
2066 | int err = 0; | |
2067 | int skb_len; | |
2068 | ||
bb33381d DB |
2069 | pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, " |
2070 | "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags, | |
2071 | addr_len); | |
1da177e4 | 2072 | |
048ed4b6 | 2073 | lock_sock(sk); |
1da177e4 LT |
2074 | |
2075 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
2076 | err = -ENOTCONN; | |
2077 | goto out; | |
2078 | } | |
2079 | ||
2080 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
2081 | if (!skb) | |
2082 | goto out; | |
2083 | ||
2084 | /* Get the total length of the skb including any skb's in the | |
2085 | * frag_list. | |
2086 | */ | |
2087 | skb_len = skb->len; | |
2088 | ||
2089 | copied = skb_len; | |
2090 | if (copied > len) | |
2091 | copied = len; | |
2092 | ||
51f3d02b | 2093 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
2094 | |
2095 | event = sctp_skb2event(skb); | |
2096 | ||
2097 | if (err) | |
2098 | goto out_free; | |
2099 | ||
3b885787 | 2100 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2101 | if (sctp_ulpevent_is_notification(event)) { |
2102 | msg->msg_flags |= MSG_NOTIFICATION; | |
2103 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
2104 | } else { | |
2105 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
2106 | } | |
2107 | ||
2347c80f GOV |
2108 | /* Check if we allow SCTP_NXTINFO. */ |
2109 | if (sp->recvnxtinfo) | |
2110 | sctp_ulpevent_read_nxtinfo(event, msg, sk); | |
0d3a421d GOV |
2111 | /* Check if we allow SCTP_RCVINFO. */ |
2112 | if (sp->recvrcvinfo) | |
2113 | sctp_ulpevent_read_rcvinfo(event, msg); | |
1da177e4 LT |
2114 | /* Check if we allow SCTP_SNDRCVINFO. */ |
2115 | if (sp->subscribe.sctp_data_io_event) | |
2116 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
0d3a421d | 2117 | |
1da177e4 LT |
2118 | err = copied; |
2119 | ||
2120 | /* If skb's length exceeds the user's buffer, update the skb and | |
2121 | * push it back to the receive_queue so that the next call to | |
2122 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2123 | */ | |
2124 | if (skb_len > copied) { | |
2125 | msg->msg_flags &= ~MSG_EOR; | |
2126 | if (flags & MSG_PEEK) | |
2127 | goto out_free; | |
2128 | sctp_skb_pull(skb, copied); | |
2129 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2130 | ||
362d5204 DB |
2131 | /* When only partial message is copied to the user, increase |
2132 | * rwnd by that amount. If all the data in the skb is read, | |
2133 | * rwnd is updated when the event is freed. | |
2134 | */ | |
2135 | if (!sctp_ulpevent_is_notification(event)) | |
2136 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2137 | goto out; |
2138 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2139 | (event->msg_flags & MSG_EOR)) | |
2140 | msg->msg_flags |= MSG_EOR; | |
2141 | else | |
2142 | msg->msg_flags &= ~MSG_EOR; | |
2143 | ||
2144 | out_free: | |
2145 | if (flags & MSG_PEEK) { | |
2146 | /* Release the skb reference acquired after peeking the skb in | |
2147 | * sctp_skb_recv_datagram(). | |
2148 | */ | |
2149 | kfree_skb(skb); | |
2150 | } else { | |
2151 | /* Free the event which includes releasing the reference to | |
2152 | * the owner of the skb, freeing the skb and updating the | |
2153 | * rwnd. | |
2154 | */ | |
2155 | sctp_ulpevent_free(event); | |
2156 | } | |
2157 | out: | |
048ed4b6 | 2158 | release_sock(sk); |
1da177e4 LT |
2159 | return err; |
2160 | } | |
2161 | ||
2162 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2163 | * | |
2164 | * This option is a on/off flag. If enabled no SCTP message | |
2165 | * fragmentation will be performed. Instead if a message being sent | |
2166 | * exceeds the current PMTU size, the message will NOT be sent and | |
2167 | * instead a error will be indicated to the user. | |
2168 | */ | |
2169 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2170 | char __user *optval, |
2171 | unsigned int optlen) | |
1da177e4 LT |
2172 | { |
2173 | int val; | |
2174 | ||
2175 | if (optlen < sizeof(int)) | |
2176 | return -EINVAL; | |
2177 | ||
2178 | if (get_user(val, (int __user *)optval)) | |
2179 | return -EFAULT; | |
2180 | ||
2181 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2182 | ||
2183 | return 0; | |
2184 | } | |
2185 | ||
2186 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2187 | unsigned int optlen) |
1da177e4 | 2188 | { |
94912301 WY |
2189 | struct sctp_association *asoc; |
2190 | struct sctp_ulpevent *event; | |
2191 | ||
7e8616d8 | 2192 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2193 | return -EINVAL; |
2194 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2195 | return -EFAULT; | |
94912301 | 2196 | |
bbbea41d | 2197 | /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT, |
94912301 WY |
2198 | * if there is no data to be sent or retransmit, the stack will |
2199 | * immediately send up this notification. | |
2200 | */ | |
2201 | if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT, | |
2202 | &sctp_sk(sk)->subscribe)) { | |
2203 | asoc = sctp_id2assoc(sk, 0); | |
2204 | ||
2205 | if (asoc && sctp_outq_is_empty(&asoc->outqueue)) { | |
2206 | event = sctp_ulpevent_make_sender_dry_event(asoc, | |
2207 | GFP_ATOMIC); | |
2208 | if (!event) | |
2209 | return -ENOMEM; | |
2210 | ||
2211 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
2212 | } | |
2213 | } | |
2214 | ||
1da177e4 LT |
2215 | return 0; |
2216 | } | |
2217 | ||
2218 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2219 | * | |
2220 | * This socket option is applicable to the UDP-style socket only. When | |
2221 | * set it will cause associations that are idle for more than the | |
2222 | * specified number of seconds to automatically close. An association | |
2223 | * being idle is defined an association that has NOT sent or received | |
2224 | * user data. The special value of '0' indicates that no automatic | |
2225 | * close of any associations should be performed. The option expects an | |
2226 | * integer defining the number of seconds of idle time before an | |
2227 | * association is closed. | |
2228 | */ | |
2229 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2230 | unsigned int optlen) |
1da177e4 LT |
2231 | { |
2232 | struct sctp_sock *sp = sctp_sk(sk); | |
9f70f46b | 2233 | struct net *net = sock_net(sk); |
1da177e4 LT |
2234 | |
2235 | /* Applicable to UDP-style socket only */ | |
2236 | if (sctp_style(sk, TCP)) | |
2237 | return -EOPNOTSUPP; | |
2238 | if (optlen != sizeof(int)) | |
2239 | return -EINVAL; | |
2240 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2241 | return -EFAULT; | |
2242 | ||
9f70f46b NH |
2243 | if (sp->autoclose > net->sctp.max_autoclose) |
2244 | sp->autoclose = net->sctp.max_autoclose; | |
2245 | ||
1da177e4 LT |
2246 | return 0; |
2247 | } | |
2248 | ||
2249 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2250 | * | |
2251 | * Applications can enable or disable heartbeats for any peer address of | |
2252 | * an association, modify an address's heartbeat interval, force a | |
2253 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2254 | * number of retransmissions sent before an address is considered | |
2255 | * unreachable. The following structure is used to access and modify an | |
2256 | * address's parameters: | |
2257 | * | |
2258 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2259 | * sctp_assoc_t spp_assoc_id; |
2260 | * struct sockaddr_storage spp_address; | |
2261 | * uint32_t spp_hbinterval; | |
2262 | * uint16_t spp_pathmaxrxt; | |
2263 | * uint32_t spp_pathmtu; | |
2264 | * uint32_t spp_sackdelay; | |
2265 | * uint32_t spp_flags; | |
2266 | * }; | |
2267 | * | |
2268 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2269 | * application, and identifies the association for | |
2270 | * this query. | |
1da177e4 LT |
2271 | * spp_address - This specifies which address is of interest. |
2272 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2273 | * in milliseconds. If a value of zero |
2274 | * is present in this field then no changes are to | |
2275 | * be made to this parameter. | |
1da177e4 LT |
2276 | * spp_pathmaxrxt - This contains the maximum number of |
2277 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2278 | * considered unreachable. If a value of zero |
2279 | * is present in this field then no changes are to | |
2280 | * be made to this parameter. | |
2281 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2282 | * specified here will be the "fixed" path mtu. | |
2283 | * Note that if the spp_address field is empty | |
2284 | * then all associations on this address will | |
2285 | * have this fixed path mtu set upon them. | |
2286 | * | |
2287 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2288 | * the number of milliseconds that sacks will be delayed | |
2289 | * for. This value will apply to all addresses of an | |
2290 | * association if the spp_address field is empty. Note | |
2291 | * also, that if delayed sack is enabled and this | |
2292 | * value is set to 0, no change is made to the last | |
2293 | * recorded delayed sack timer value. | |
2294 | * | |
2295 | * spp_flags - These flags are used to control various features | |
2296 | * on an association. The flag field may contain | |
2297 | * zero or more of the following options. | |
2298 | * | |
2299 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2300 | * specified address. Note that if the address | |
2301 | * field is empty all addresses for the association | |
2302 | * have heartbeats enabled upon them. | |
2303 | * | |
2304 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2305 | * speicifed address. Note that if the address | |
2306 | * field is empty all addresses for the association | |
2307 | * will have their heartbeats disabled. Note also | |
2308 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2309 | * mutually exclusive, only one of these two should | |
2310 | * be specified. Enabling both fields will have | |
2311 | * undetermined results. | |
2312 | * | |
2313 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2314 | * to be made immediately. | |
2315 | * | |
bdf3092a VY |
2316 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2317 | * heartbeat delayis to be set to the value of 0 | |
2318 | * milliseconds. | |
2319 | * | |
52ccb8e9 FF |
2320 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2321 | * discovery upon the specified address. Note that | |
2322 | * if the address feild is empty then all addresses | |
2323 | * on the association are effected. | |
2324 | * | |
2325 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2326 | * discovery upon the specified address. Note that | |
2327 | * if the address feild is empty then all addresses | |
2328 | * on the association are effected. Not also that | |
2329 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2330 | * exclusive. Enabling both will have undetermined | |
2331 | * results. | |
2332 | * | |
2333 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2334 | * on delayed sack. The time specified in spp_sackdelay | |
2335 | * is used to specify the sack delay for this address. Note | |
2336 | * that if spp_address is empty then all addresses will | |
2337 | * enable delayed sack and take on the sack delay | |
2338 | * value specified in spp_sackdelay. | |
2339 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2340 | * off delayed sack. If the spp_address field is blank then | |
2341 | * delayed sack is disabled for the entire association. Note | |
2342 | * also that this field is mutually exclusive to | |
2343 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2344 | * results. | |
1da177e4 | 2345 | */ |
16164366 AB |
2346 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2347 | struct sctp_transport *trans, | |
2348 | struct sctp_association *asoc, | |
2349 | struct sctp_sock *sp, | |
2350 | int hb_change, | |
2351 | int pmtud_change, | |
2352 | int sackdelay_change) | |
52ccb8e9 FF |
2353 | { |
2354 | int error; | |
2355 | ||
2356 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
55e26eb9 EB |
2357 | struct net *net = sock_net(trans->asoc->base.sk); |
2358 | ||
2359 | error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans); | |
52ccb8e9 FF |
2360 | if (error) |
2361 | return error; | |
2362 | } | |
2363 | ||
bdf3092a VY |
2364 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2365 | * this field is ignored. Note also that a value of zero indicates | |
2366 | * the current setting should be left unchanged. | |
2367 | */ | |
2368 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2369 | ||
2370 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2371 | * set. This lets us use 0 value when this flag | |
2372 | * is set. | |
2373 | */ | |
2374 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2375 | params->spp_hbinterval = 0; | |
2376 | ||
2377 | if (params->spp_hbinterval || | |
2378 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2379 | if (trans) { | |
2380 | trans->hbinterval = | |
2381 | msecs_to_jiffies(params->spp_hbinterval); | |
2382 | } else if (asoc) { | |
2383 | asoc->hbinterval = | |
2384 | msecs_to_jiffies(params->spp_hbinterval); | |
2385 | } else { | |
2386 | sp->hbinterval = params->spp_hbinterval; | |
2387 | } | |
52ccb8e9 FF |
2388 | } |
2389 | } | |
2390 | ||
2391 | if (hb_change) { | |
2392 | if (trans) { | |
2393 | trans->param_flags = | |
2394 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2395 | } else if (asoc) { | |
2396 | asoc->param_flags = | |
2397 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2398 | } else { | |
2399 | sp->param_flags = | |
2400 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2401 | } | |
2402 | } | |
2403 | ||
bdf3092a VY |
2404 | /* When Path MTU discovery is disabled the value specified here will |
2405 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2406 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2407 | * effect). | |
2408 | */ | |
2409 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2410 | if (trans) { |
2411 | trans->pathmtu = params->spp_pathmtu; | |
02f3d4ce | 2412 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2413 | } else if (asoc) { |
2414 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2415 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2416 | } else { |
2417 | sp->pathmtu = params->spp_pathmtu; | |
2418 | } | |
2419 | } | |
2420 | ||
2421 | if (pmtud_change) { | |
2422 | if (trans) { | |
2423 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2424 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2425 | trans->param_flags = | |
2426 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2427 | if (update) { | |
9914ae3c | 2428 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
02f3d4ce | 2429 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2430 | } |
2431 | } else if (asoc) { | |
2432 | asoc->param_flags = | |
2433 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2434 | } else { | |
2435 | sp->param_flags = | |
2436 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2437 | } | |
2438 | } | |
2439 | ||
bdf3092a VY |
2440 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2441 | * value of this field is ignored. Note also that a value of zero | |
2442 | * indicates the current setting should be left unchanged. | |
2443 | */ | |
2444 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2445 | if (trans) { |
2446 | trans->sackdelay = | |
2447 | msecs_to_jiffies(params->spp_sackdelay); | |
2448 | } else if (asoc) { | |
2449 | asoc->sackdelay = | |
2450 | msecs_to_jiffies(params->spp_sackdelay); | |
2451 | } else { | |
2452 | sp->sackdelay = params->spp_sackdelay; | |
2453 | } | |
2454 | } | |
2455 | ||
2456 | if (sackdelay_change) { | |
2457 | if (trans) { | |
2458 | trans->param_flags = | |
2459 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2460 | sackdelay_change; | |
2461 | } else if (asoc) { | |
2462 | asoc->param_flags = | |
2463 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2464 | sackdelay_change; | |
2465 | } else { | |
2466 | sp->param_flags = | |
2467 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2468 | sackdelay_change; | |
2469 | } | |
2470 | } | |
2471 | ||
37051f73 APO |
2472 | /* Note that a value of zero indicates the current setting should be |
2473 | left unchanged. | |
bdf3092a | 2474 | */ |
37051f73 | 2475 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2476 | if (trans) { |
2477 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2478 | } else if (asoc) { | |
2479 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2480 | } else { | |
2481 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2482 | } | |
2483 | } | |
2484 | ||
2485 | return 0; | |
2486 | } | |
2487 | ||
1da177e4 | 2488 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2489 | char __user *optval, |
2490 | unsigned int optlen) | |
1da177e4 | 2491 | { |
52ccb8e9 FF |
2492 | struct sctp_paddrparams params; |
2493 | struct sctp_transport *trans = NULL; | |
2494 | struct sctp_association *asoc = NULL; | |
2495 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2496 | int error; |
52ccb8e9 | 2497 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2498 | |
2499 | if (optlen != sizeof(struct sctp_paddrparams)) | |
cb3f837b | 2500 | return -EINVAL; |
52ccb8e9 | 2501 | |
1da177e4 LT |
2502 | if (copy_from_user(¶ms, optval, optlen)) |
2503 | return -EFAULT; | |
2504 | ||
52ccb8e9 FF |
2505 | /* Validate flags and value parameters. */ |
2506 | hb_change = params.spp_flags & SPP_HB; | |
2507 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2508 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2509 | ||
2510 | if (hb_change == SPP_HB || | |
2511 | pmtud_change == SPP_PMTUD || | |
2512 | sackdelay_change == SPP_SACKDELAY || | |
2513 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2514 | (params.spp_pathmtu && |
2515 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2516 | return -EINVAL; |
1da177e4 | 2517 | |
52ccb8e9 FF |
2518 | /* If an address other than INADDR_ANY is specified, and |
2519 | * no transport is found, then the request is invalid. | |
2520 | */ | |
cb3f837b | 2521 | if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2522 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2523 | params.spp_assoc_id); | |
2524 | if (!trans) | |
1da177e4 | 2525 | return -EINVAL; |
1da177e4 LT |
2526 | } |
2527 | ||
52ccb8e9 FF |
2528 | /* Get association, if assoc_id != 0 and the socket is a one |
2529 | * to many style socket, and an association was not found, then | |
2530 | * the id was invalid. | |
2531 | */ | |
2532 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2533 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2534 | return -EINVAL; |
2535 | ||
52ccb8e9 FF |
2536 | /* Heartbeat demand can only be sent on a transport or |
2537 | * association, but not a socket. | |
1da177e4 | 2538 | */ |
52ccb8e9 FF |
2539 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2540 | return -EINVAL; | |
2541 | ||
2542 | /* Process parameters. */ | |
2543 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2544 | hb_change, pmtud_change, | |
2545 | sackdelay_change); | |
1da177e4 | 2546 | |
52ccb8e9 FF |
2547 | if (error) |
2548 | return error; | |
2549 | ||
2550 | /* If changes are for association, also apply parameters to each | |
2551 | * transport. | |
1da177e4 | 2552 | */ |
52ccb8e9 | 2553 | if (!trans && asoc) { |
9dbc15f0 RD |
2554 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2555 | transports) { | |
52ccb8e9 FF |
2556 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2557 | hb_change, pmtud_change, | |
2558 | sackdelay_change); | |
2559 | } | |
2560 | } | |
1da177e4 LT |
2561 | |
2562 | return 0; | |
2563 | } | |
2564 | ||
0ea5e4df | 2565 | static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags) |
2566 | { | |
2567 | return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE; | |
2568 | } | |
2569 | ||
2570 | static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags) | |
2571 | { | |
2572 | return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE; | |
2573 | } | |
2574 | ||
d364d927 WY |
2575 | /* |
2576 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2577 | * | |
2578 | * This option will effect the way delayed acks are performed. This | |
2579 | * option allows you to get or set the delayed ack time, in | |
2580 | * milliseconds. It also allows changing the delayed ack frequency. | |
2581 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2582 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2583 | * values. If the assoc_id field is non-zero, then the set or get | |
2584 | * effects the specified association for the one to many model (the | |
2585 | * assoc_id field is ignored by the one to one model). Note that if | |
2586 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2587 | * current values will remain unchanged. | |
2588 | * | |
2589 | * struct sctp_sack_info { | |
2590 | * sctp_assoc_t sack_assoc_id; | |
2591 | * uint32_t sack_delay; | |
2592 | * uint32_t sack_freq; | |
2593 | * }; | |
2594 | * | |
2595 | * sack_assoc_id - This parameter, indicates which association the user | |
2596 | * is performing an action upon. Note that if this field's value is | |
2597 | * zero then the endpoints default value is changed (effecting future | |
2598 | * associations only). | |
2599 | * | |
2600 | * sack_delay - This parameter contains the number of milliseconds that | |
2601 | * the user is requesting the delayed ACK timer be set to. Note that | |
2602 | * this value is defined in the standard to be between 200 and 500 | |
2603 | * milliseconds. | |
2604 | * | |
2605 | * sack_freq - This parameter contains the number of packets that must | |
2606 | * be received before a sack is sent without waiting for the delay | |
2607 | * timer to expire. The default value for this is 2, setting this | |
2608 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2609 | */ |
2610 | ||
d364d927 | 2611 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2612 | char __user *optval, unsigned int optlen) |
7708610b | 2613 | { |
d364d927 | 2614 | struct sctp_sack_info params; |
7708610b FF |
2615 | struct sctp_transport *trans = NULL; |
2616 | struct sctp_association *asoc = NULL; | |
2617 | struct sctp_sock *sp = sctp_sk(sk); | |
2618 | ||
d364d927 WY |
2619 | if (optlen == sizeof(struct sctp_sack_info)) { |
2620 | if (copy_from_user(¶ms, optval, optlen)) | |
2621 | return -EFAULT; | |
7708610b | 2622 | |
d364d927 WY |
2623 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2624 | return 0; | |
2625 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
94f65193 | 2626 | pr_warn_ratelimited(DEPRECATED |
f916ec96 | 2627 | "%s (pid %d) " |
94f65193 | 2628 | "Use of struct sctp_assoc_value in delayed_ack socket option.\n" |
f916ec96 NH |
2629 | "Use struct sctp_sack_info instead\n", |
2630 | current->comm, task_pid_nr(current)); | |
d364d927 WY |
2631 | if (copy_from_user(¶ms, optval, optlen)) |
2632 | return -EFAULT; | |
2633 | ||
2634 | if (params.sack_delay == 0) | |
2635 | params.sack_freq = 1; | |
2636 | else | |
2637 | params.sack_freq = 0; | |
2638 | } else | |
cb3f837b | 2639 | return -EINVAL; |
7708610b FF |
2640 | |
2641 | /* Validate value parameter. */ | |
d364d927 | 2642 | if (params.sack_delay > 500) |
7708610b FF |
2643 | return -EINVAL; |
2644 | ||
d364d927 | 2645 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2646 | * to many style socket, and an association was not found, then |
2647 | * the id was invalid. | |
d808ad9a | 2648 | */ |
d364d927 WY |
2649 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2650 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2651 | return -EINVAL; |
2652 | ||
d364d927 | 2653 | if (params.sack_delay) { |
7708610b FF |
2654 | if (asoc) { |
2655 | asoc->sackdelay = | |
d364d927 | 2656 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2657 | asoc->param_flags = |
0ea5e4df | 2658 | sctp_spp_sackdelay_enable(asoc->param_flags); |
7708610b | 2659 | } else { |
d364d927 | 2660 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2661 | sp->param_flags = |
0ea5e4df | 2662 | sctp_spp_sackdelay_enable(sp->param_flags); |
7708610b | 2663 | } |
d364d927 WY |
2664 | } |
2665 | ||
2666 | if (params.sack_freq == 1) { | |
7708610b | 2667 | if (asoc) { |
d808ad9a | 2668 | asoc->param_flags = |
0ea5e4df | 2669 | sctp_spp_sackdelay_disable(asoc->param_flags); |
7708610b | 2670 | } else { |
d808ad9a | 2671 | sp->param_flags = |
0ea5e4df | 2672 | sctp_spp_sackdelay_disable(sp->param_flags); |
7708610b | 2673 | } |
d364d927 WY |
2674 | } else if (params.sack_freq > 1) { |
2675 | if (asoc) { | |
2676 | asoc->sackfreq = params.sack_freq; | |
2677 | asoc->param_flags = | |
0ea5e4df | 2678 | sctp_spp_sackdelay_enable(asoc->param_flags); |
d364d927 WY |
2679 | } else { |
2680 | sp->sackfreq = params.sack_freq; | |
2681 | sp->param_flags = | |
0ea5e4df | 2682 | sctp_spp_sackdelay_enable(sp->param_flags); |
d364d927 | 2683 | } |
7708610b FF |
2684 | } |
2685 | ||
2686 | /* If change is for association, also apply to each transport. */ | |
2687 | if (asoc) { | |
9dbc15f0 RD |
2688 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2689 | transports) { | |
d364d927 | 2690 | if (params.sack_delay) { |
7708610b | 2691 | trans->sackdelay = |
d364d927 | 2692 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2693 | trans->param_flags = |
0ea5e4df | 2694 | sctp_spp_sackdelay_enable(trans->param_flags); |
d364d927 | 2695 | } |
7bfe8bdb | 2696 | if (params.sack_freq == 1) { |
d808ad9a | 2697 | trans->param_flags = |
0ea5e4df | 2698 | sctp_spp_sackdelay_disable(trans->param_flags); |
d364d927 WY |
2699 | } else if (params.sack_freq > 1) { |
2700 | trans->sackfreq = params.sack_freq; | |
2701 | trans->param_flags = | |
0ea5e4df | 2702 | sctp_spp_sackdelay_enable(trans->param_flags); |
7708610b FF |
2703 | } |
2704 | } | |
2705 | } | |
d808ad9a | 2706 | |
7708610b FF |
2707 | return 0; |
2708 | } | |
2709 | ||
1da177e4 LT |
2710 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2711 | * | |
2712 | * Applications can specify protocol parameters for the default association | |
2713 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2714 | * is SCTP_INITMSG. | |
2715 | * | |
2716 | * Setting initialization parameters is effective only on an unconnected | |
2717 | * socket (for UDP-style sockets only future associations are effected | |
2718 | * by the change). With TCP-style sockets, this option is inherited by | |
2719 | * sockets derived from a listener socket. | |
2720 | */ | |
b7058842 | 2721 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2722 | { |
2723 | struct sctp_initmsg sinit; | |
2724 | struct sctp_sock *sp = sctp_sk(sk); | |
2725 | ||
2726 | if (optlen != sizeof(struct sctp_initmsg)) | |
2727 | return -EINVAL; | |
2728 | if (copy_from_user(&sinit, optval, optlen)) | |
2729 | return -EFAULT; | |
2730 | ||
2731 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2732 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2733 | if (sinit.sinit_max_instreams) |
d808ad9a | 2734 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2735 | if (sinit.sinit_max_attempts) |
d808ad9a | 2736 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2737 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2738 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2739 | |
2740 | return 0; | |
2741 | } | |
2742 | ||
2743 | /* | |
2744 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2745 | * | |
2746 | * Applications that wish to use the sendto() system call may wish to | |
2747 | * specify a default set of parameters that would normally be supplied | |
2748 | * through the inclusion of ancillary data. This socket option allows | |
2749 | * such an application to set the default sctp_sndrcvinfo structure. | |
2750 | * The application that wishes to use this socket option simply passes | |
2751 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2752 | * 5.2.2) The input parameters accepted by this call include | |
2753 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2754 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2755 | * to this call if the caller is using the UDP model. | |
2756 | */ | |
2757 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2758 | char __user *optval, |
2759 | unsigned int optlen) | |
1da177e4 | 2760 | { |
1da177e4 | 2761 | struct sctp_sock *sp = sctp_sk(sk); |
6b3fd5f3 GOV |
2762 | struct sctp_association *asoc; |
2763 | struct sctp_sndrcvinfo info; | |
1da177e4 | 2764 | |
6b3fd5f3 | 2765 | if (optlen != sizeof(info)) |
1da177e4 LT |
2766 | return -EINVAL; |
2767 | if (copy_from_user(&info, optval, optlen)) | |
2768 | return -EFAULT; | |
6b3fd5f3 GOV |
2769 | if (info.sinfo_flags & |
2770 | ~(SCTP_UNORDERED | SCTP_ADDR_OVER | | |
2771 | SCTP_ABORT | SCTP_EOF)) | |
2772 | return -EINVAL; | |
1da177e4 LT |
2773 | |
2774 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2775 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2776 | return -EINVAL; | |
1da177e4 LT |
2777 | if (asoc) { |
2778 | asoc->default_stream = info.sinfo_stream; | |
2779 | asoc->default_flags = info.sinfo_flags; | |
2780 | asoc->default_ppid = info.sinfo_ppid; | |
2781 | asoc->default_context = info.sinfo_context; | |
2782 | asoc->default_timetolive = info.sinfo_timetolive; | |
2783 | } else { | |
2784 | sp->default_stream = info.sinfo_stream; | |
2785 | sp->default_flags = info.sinfo_flags; | |
2786 | sp->default_ppid = info.sinfo_ppid; | |
2787 | sp->default_context = info.sinfo_context; | |
2788 | sp->default_timetolive = info.sinfo_timetolive; | |
2789 | } | |
2790 | ||
2791 | return 0; | |
2792 | } | |
2793 | ||
6b3fd5f3 GOV |
2794 | /* RFC6458, Section 8.1.31. Set/get Default Send Parameters |
2795 | * (SCTP_DEFAULT_SNDINFO) | |
2796 | */ | |
2797 | static int sctp_setsockopt_default_sndinfo(struct sock *sk, | |
2798 | char __user *optval, | |
2799 | unsigned int optlen) | |
2800 | { | |
2801 | struct sctp_sock *sp = sctp_sk(sk); | |
2802 | struct sctp_association *asoc; | |
2803 | struct sctp_sndinfo info; | |
2804 | ||
2805 | if (optlen != sizeof(info)) | |
2806 | return -EINVAL; | |
2807 | if (copy_from_user(&info, optval, optlen)) | |
2808 | return -EFAULT; | |
2809 | if (info.snd_flags & | |
2810 | ~(SCTP_UNORDERED | SCTP_ADDR_OVER | | |
2811 | SCTP_ABORT | SCTP_EOF)) | |
2812 | return -EINVAL; | |
2813 | ||
2814 | asoc = sctp_id2assoc(sk, info.snd_assoc_id); | |
2815 | if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP)) | |
2816 | return -EINVAL; | |
2817 | if (asoc) { | |
2818 | asoc->default_stream = info.snd_sid; | |
2819 | asoc->default_flags = info.snd_flags; | |
2820 | asoc->default_ppid = info.snd_ppid; | |
2821 | asoc->default_context = info.snd_context; | |
2822 | } else { | |
2823 | sp->default_stream = info.snd_sid; | |
2824 | sp->default_flags = info.snd_flags; | |
2825 | sp->default_ppid = info.snd_ppid; | |
2826 | sp->default_context = info.snd_context; | |
2827 | } | |
2828 | ||
2829 | return 0; | |
2830 | } | |
2831 | ||
1da177e4 LT |
2832 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) |
2833 | * | |
2834 | * Requests that the local SCTP stack use the enclosed peer address as | |
2835 | * the association primary. The enclosed address must be one of the | |
2836 | * association peer's addresses. | |
2837 | */ | |
2838 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2839 | unsigned int optlen) |
1da177e4 LT |
2840 | { |
2841 | struct sctp_prim prim; | |
2842 | struct sctp_transport *trans; | |
2843 | ||
2844 | if (optlen != sizeof(struct sctp_prim)) | |
2845 | return -EINVAL; | |
2846 | ||
2847 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2848 | return -EFAULT; | |
2849 | ||
2850 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2851 | if (!trans) | |
2852 | return -EINVAL; | |
2853 | ||
2854 | sctp_assoc_set_primary(trans->asoc, trans); | |
2855 | ||
2856 | return 0; | |
2857 | } | |
2858 | ||
2859 | /* | |
2860 | * 7.1.5 SCTP_NODELAY | |
2861 | * | |
2862 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2863 | * generally sent as soon as possible and no unnecessary delays are | |
2864 | * introduced, at the cost of more packets in the network. Expects an | |
2865 | * integer boolean flag. | |
2866 | */ | |
2867 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2868 | unsigned int optlen) |
1da177e4 LT |
2869 | { |
2870 | int val; | |
2871 | ||
2872 | if (optlen < sizeof(int)) | |
2873 | return -EINVAL; | |
2874 | if (get_user(val, (int __user *)optval)) | |
2875 | return -EFAULT; | |
2876 | ||
2877 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2878 | return 0; | |
2879 | } | |
2880 | ||
2881 | /* | |
2882 | * | |
2883 | * 7.1.1 SCTP_RTOINFO | |
2884 | * | |
2885 | * The protocol parameters used to initialize and bound retransmission | |
2886 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2887 | * and modify these parameters. | |
2888 | * All parameters are time values, in milliseconds. A value of 0, when | |
2889 | * modifying the parameters, indicates that the current value should not | |
2890 | * be changed. | |
2891 | * | |
2892 | */ | |
b7058842 DM |
2893 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2894 | { | |
1da177e4 LT |
2895 | struct sctp_rtoinfo rtoinfo; |
2896 | struct sctp_association *asoc; | |
85f935d4 | 2897 | unsigned long rto_min, rto_max; |
2898 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 LT |
2899 | |
2900 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2901 | return -EINVAL; | |
2902 | ||
2903 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2904 | return -EFAULT; | |
2905 | ||
2906 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2907 | ||
2908 | /* Set the values to the specific association */ | |
2909 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2910 | return -EINVAL; | |
2911 | ||
85f935d4 | 2912 | rto_max = rtoinfo.srto_max; |
2913 | rto_min = rtoinfo.srto_min; | |
2914 | ||
2915 | if (rto_max) | |
2916 | rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max; | |
2917 | else | |
2918 | rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max; | |
2919 | ||
2920 | if (rto_min) | |
2921 | rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min; | |
2922 | else | |
2923 | rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min; | |
2924 | ||
2925 | if (rto_min > rto_max) | |
2926 | return -EINVAL; | |
2927 | ||
1da177e4 LT |
2928 | if (asoc) { |
2929 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2930 | asoc->rto_initial = |
1da177e4 | 2931 | msecs_to_jiffies(rtoinfo.srto_initial); |
85f935d4 | 2932 | asoc->rto_max = rto_max; |
2933 | asoc->rto_min = rto_min; | |
1da177e4 LT |
2934 | } else { |
2935 | /* If there is no association or the association-id = 0 | |
2936 | * set the values to the endpoint. | |
2937 | */ | |
1da177e4 LT |
2938 | if (rtoinfo.srto_initial != 0) |
2939 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
85f935d4 | 2940 | sp->rtoinfo.srto_max = rto_max; |
2941 | sp->rtoinfo.srto_min = rto_min; | |
1da177e4 LT |
2942 | } |
2943 | ||
2944 | return 0; | |
2945 | } | |
2946 | ||
2947 | /* | |
2948 | * | |
2949 | * 7.1.2 SCTP_ASSOCINFO | |
2950 | * | |
59c51591 | 2951 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2952 | * of the association. |
2953 | * Returns an error if the new association retransmission value is | |
2954 | * greater than the sum of the retransmission value of the peer. | |
2955 | * See [SCTP] for more information. | |
2956 | * | |
2957 | */ | |
b7058842 | 2958 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2959 | { |
2960 | ||
2961 | struct sctp_assocparams assocparams; | |
2962 | struct sctp_association *asoc; | |
2963 | ||
2964 | if (optlen != sizeof(struct sctp_assocparams)) | |
2965 | return -EINVAL; | |
2966 | if (copy_from_user(&assocparams, optval, optlen)) | |
2967 | return -EFAULT; | |
2968 | ||
2969 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2970 | ||
2971 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2972 | return -EINVAL; | |
2973 | ||
2974 | /* Set the values to the specific association */ | |
2975 | if (asoc) { | |
402d68c4 VY |
2976 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2977 | __u32 path_sum = 0; | |
2978 | int paths = 0; | |
402d68c4 VY |
2979 | struct sctp_transport *peer_addr; |
2980 | ||
9dbc15f0 RD |
2981 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2982 | transports) { | |
402d68c4 VY |
2983 | path_sum += peer_addr->pathmaxrxt; |
2984 | paths++; | |
2985 | } | |
2986 | ||
025dfdaf | 2987 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2988 | * one path/transport. We do this because path |
2989 | * retransmissions are only counted when we have more | |
2990 | * then one path. | |
2991 | */ | |
2992 | if (paths > 1 && | |
2993 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2994 | return -EINVAL; | |
2995 | ||
1da177e4 | 2996 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2997 | } |
2998 | ||
52db882f DB |
2999 | if (assocparams.sasoc_cookie_life != 0) |
3000 | asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life); | |
1da177e4 LT |
3001 | } else { |
3002 | /* Set the values to the endpoint */ | |
3003 | struct sctp_sock *sp = sctp_sk(sk); | |
3004 | ||
3005 | if (assocparams.sasoc_asocmaxrxt != 0) | |
3006 | sp->assocparams.sasoc_asocmaxrxt = | |
3007 | assocparams.sasoc_asocmaxrxt; | |
3008 | if (assocparams.sasoc_cookie_life != 0) | |
3009 | sp->assocparams.sasoc_cookie_life = | |
3010 | assocparams.sasoc_cookie_life; | |
3011 | } | |
3012 | return 0; | |
3013 | } | |
3014 | ||
3015 | /* | |
3016 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
3017 | * | |
3018 | * This socket option is a boolean flag which turns on or off mapped V4 | |
3019 | * addresses. If this option is turned on and the socket is type | |
3020 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
3021 | * If this option is turned off, then no mapping will be done of V4 | |
3022 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
3023 | * addresses on the socket. | |
3024 | */ | |
b7058842 | 3025 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
3026 | { |
3027 | int val; | |
3028 | struct sctp_sock *sp = sctp_sk(sk); | |
3029 | ||
3030 | if (optlen < sizeof(int)) | |
3031 | return -EINVAL; | |
3032 | if (get_user(val, (int __user *)optval)) | |
3033 | return -EFAULT; | |
3034 | if (val) | |
3035 | sp->v4mapped = 1; | |
3036 | else | |
3037 | sp->v4mapped = 0; | |
3038 | ||
3039 | return 0; | |
3040 | } | |
3041 | ||
3042 | /* | |
e89c2095 WY |
3043 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
3044 | * This option will get or set the maximum size to put in any outgoing | |
3045 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
3046 | * fragmented by SCTP into the specified size. Note that the underlying |
3047 | * SCTP implementation may fragment into smaller sized chunks when the | |
3048 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
3049 | * the user. The default value for this option is '0' which indicates |
3050 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
3051 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
3052 | * than the maximum size of an IP datagram will effectively let SCTP | |
3053 | * control fragmentation (i.e. the same as setting this option to 0). | |
3054 | * | |
3055 | * The following structure is used to access and modify this parameter: | |
3056 | * | |
3057 | * struct sctp_assoc_value { | |
3058 | * sctp_assoc_t assoc_id; | |
3059 | * uint32_t assoc_value; | |
3060 | * }; | |
3061 | * | |
3062 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
3063 | * For one-to-many style sockets this parameter indicates which | |
3064 | * association the user is performing an action upon. Note that if | |
3065 | * this field's value is zero then the endpoints default value is | |
3066 | * changed (effecting future associations only). | |
3067 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 3068 | */ |
b7058842 | 3069 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 3070 | { |
e89c2095 | 3071 | struct sctp_assoc_value params; |
1da177e4 | 3072 | struct sctp_association *asoc; |
1da177e4 LT |
3073 | struct sctp_sock *sp = sctp_sk(sk); |
3074 | int val; | |
3075 | ||
e89c2095 | 3076 | if (optlen == sizeof(int)) { |
94f65193 | 3077 | pr_warn_ratelimited(DEPRECATED |
f916ec96 | 3078 | "%s (pid %d) " |
94f65193 | 3079 | "Use of int in maxseg socket option.\n" |
f916ec96 NH |
3080 | "Use struct sctp_assoc_value instead\n", |
3081 | current->comm, task_pid_nr(current)); | |
e89c2095 WY |
3082 | if (copy_from_user(&val, optval, optlen)) |
3083 | return -EFAULT; | |
3084 | params.assoc_id = 0; | |
3085 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3086 | if (copy_from_user(¶ms, optval, optlen)) | |
3087 | return -EFAULT; | |
3088 | val = params.assoc_value; | |
3089 | } else | |
1da177e4 | 3090 | return -EINVAL; |
e89c2095 | 3091 | |
96a33998 | 3092 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 3093 | return -EINVAL; |
1da177e4 | 3094 | |
e89c2095 WY |
3095 | asoc = sctp_id2assoc(sk, params.assoc_id); |
3096 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
3097 | return -EINVAL; | |
3098 | ||
3099 | if (asoc) { | |
3100 | if (val == 0) { | |
3101 | val = asoc->pathmtu; | |
3102 | val -= sp->pf->af->net_header_len; | |
3103 | val -= sizeof(struct sctphdr) + | |
3104 | sizeof(struct sctp_data_chunk); | |
3105 | } | |
f68b2e05 VY |
3106 | asoc->user_frag = val; |
3107 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
3108 | } else { |
3109 | sp->user_frag = val; | |
1da177e4 LT |
3110 | } |
3111 | ||
3112 | return 0; | |
3113 | } | |
3114 | ||
3115 | ||
3116 | /* | |
3117 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
3118 | * | |
3119 | * Requests that the peer mark the enclosed address as the association | |
3120 | * primary. The enclosed address must be one of the association's | |
3121 | * locally bound addresses. The following structure is used to make a | |
3122 | * set primary request: | |
3123 | */ | |
3124 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 3125 | unsigned int optlen) |
1da177e4 | 3126 | { |
e1fc3b14 | 3127 | struct net *net = sock_net(sk); |
1da177e4 | 3128 | struct sctp_sock *sp; |
1da177e4 LT |
3129 | struct sctp_association *asoc = NULL; |
3130 | struct sctp_setpeerprim prim; | |
3131 | struct sctp_chunk *chunk; | |
40a01039 | 3132 | struct sctp_af *af; |
1da177e4 LT |
3133 | int err; |
3134 | ||
3135 | sp = sctp_sk(sk); | |
1da177e4 | 3136 | |
e1fc3b14 | 3137 | if (!net->sctp.addip_enable) |
1da177e4 LT |
3138 | return -EPERM; |
3139 | ||
3140 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
3141 | return -EINVAL; | |
3142 | ||
3143 | if (copy_from_user(&prim, optval, optlen)) | |
3144 | return -EFAULT; | |
3145 | ||
3146 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 3147 | if (!asoc) |
1da177e4 LT |
3148 | return -EINVAL; |
3149 | ||
3150 | if (!asoc->peer.asconf_capable) | |
3151 | return -EPERM; | |
3152 | ||
3153 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
3154 | return -EPERM; | |
3155 | ||
3156 | if (!sctp_state(asoc, ESTABLISHED)) | |
3157 | return -ENOTCONN; | |
3158 | ||
40a01039 WY |
3159 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
3160 | if (!af) | |
3161 | return -EINVAL; | |
3162 | ||
3163 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
3164 | return -EADDRNOTAVAIL; | |
3165 | ||
1da177e4 LT |
3166 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
3167 | return -EADDRNOTAVAIL; | |
3168 | ||
3169 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3170 | chunk = sctp_make_asconf_set_prim(asoc, | |
3171 | (union sctp_addr *)&prim.sspp_addr); | |
3172 | if (!chunk) | |
3173 | return -ENOMEM; | |
3174 | ||
3175 | err = sctp_send_asconf(asoc, chunk); | |
3176 | ||
bb33381d | 3177 | pr_debug("%s: we set peer primary addr primitively\n", __func__); |
1da177e4 LT |
3178 | |
3179 | return err; | |
3180 | } | |
3181 | ||
0f3fffd8 | 3182 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3183 | unsigned int optlen) |
1da177e4 | 3184 | { |
0f3fffd8 | 3185 | struct sctp_setadaptation adaptation; |
1da177e4 | 3186 | |
0f3fffd8 | 3187 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3188 | return -EINVAL; |
0f3fffd8 | 3189 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3190 | return -EFAULT; |
3191 | ||
0f3fffd8 | 3192 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3193 | |
3194 | return 0; | |
3195 | } | |
3196 | ||
6ab792f5 ISJ |
3197 | /* |
3198 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3199 | * | |
3200 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3201 | * used when a failed message is retrieved holding the value that was | |
3202 | * sent down on the actual send call. This option allows the setting of | |
3203 | * a default context on an association basis that will be received on | |
3204 | * reading messages from the peer. This is especially helpful in the | |
3205 | * one-2-many model for an application to keep some reference to an | |
3206 | * internal state machine that is processing messages on the | |
3207 | * association. Note that the setting of this value only effects | |
3208 | * received messages from the peer and does not effect the value that is | |
3209 | * saved with outbound messages. | |
3210 | */ | |
3211 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3212 | unsigned int optlen) |
6ab792f5 ISJ |
3213 | { |
3214 | struct sctp_assoc_value params; | |
3215 | struct sctp_sock *sp; | |
3216 | struct sctp_association *asoc; | |
3217 | ||
3218 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3219 | return -EINVAL; | |
3220 | if (copy_from_user(¶ms, optval, optlen)) | |
3221 | return -EFAULT; | |
3222 | ||
3223 | sp = sctp_sk(sk); | |
3224 | ||
3225 | if (params.assoc_id != 0) { | |
3226 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3227 | if (!asoc) | |
3228 | return -EINVAL; | |
3229 | asoc->default_rcv_context = params.assoc_value; | |
3230 | } else { | |
3231 | sp->default_rcv_context = params.assoc_value; | |
3232 | } | |
3233 | ||
3234 | return 0; | |
3235 | } | |
3236 | ||
b6e1331f VY |
3237 | /* |
3238 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3239 | * | |
3240 | * This options will at a minimum specify if the implementation is doing | |
3241 | * fragmented interleave. Fragmented interleave, for a one to many | |
3242 | * socket, is when subsequent calls to receive a message may return | |
3243 | * parts of messages from different associations. Some implementations | |
3244 | * may allow you to turn this value on or off. If so, when turned off, | |
3245 | * no fragment interleave will occur (which will cause a head of line | |
3246 | * blocking amongst multiple associations sharing the same one to many | |
3247 | * socket). When this option is turned on, then each receive call may | |
3248 | * come from a different association (thus the user must receive data | |
3249 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3250 | * association each receive belongs to. | |
3251 | * | |
3252 | * This option takes a boolean value. A non-zero value indicates that | |
3253 | * fragmented interleave is on. A value of zero indicates that | |
3254 | * fragmented interleave is off. | |
3255 | * | |
3256 | * Note that it is important that an implementation that allows this | |
3257 | * option to be turned on, have it off by default. Otherwise an unaware | |
3258 | * application using the one to many model may become confused and act | |
3259 | * incorrectly. | |
3260 | */ | |
3261 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3262 | char __user *optval, | |
b7058842 | 3263 | unsigned int optlen) |
b6e1331f VY |
3264 | { |
3265 | int val; | |
3266 | ||
3267 | if (optlen != sizeof(int)) | |
3268 | return -EINVAL; | |
3269 | if (get_user(val, (int __user *)optval)) | |
3270 | return -EFAULT; | |
3271 | ||
3272 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3273 | ||
3274 | return 0; | |
3275 | } | |
3276 | ||
d49d91d7 | 3277 | /* |
8510b937 | 3278 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3279 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3280 | * |
d49d91d7 VY |
3281 | * This option will set or get the SCTP partial delivery point. This |
3282 | * point is the size of a message where the partial delivery API will be | |
3283 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3284 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3285 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3286 | * point. Note also that the call will fail if the user attempts to set |
3287 | * this value larger than the socket receive buffer size. | |
3288 | * | |
3289 | * Note that any single message having a length smaller than or equal to | |
3290 | * the SCTP partial delivery point will be delivered in one single read | |
3291 | * call as long as the user provided buffer is large enough to hold the | |
3292 | * message. | |
d49d91d7 VY |
3293 | */ |
3294 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3295 | char __user *optval, | |
b7058842 | 3296 | unsigned int optlen) |
d49d91d7 VY |
3297 | { |
3298 | u32 val; | |
3299 | ||
3300 | if (optlen != sizeof(u32)) | |
3301 | return -EINVAL; | |
3302 | if (get_user(val, (int __user *)optval)) | |
3303 | return -EFAULT; | |
3304 | ||
8510b937 WY |
3305 | /* Note: We double the receive buffer from what the user sets |
3306 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3307 | */ | |
3308 | if (val > (sk->sk_rcvbuf >> 1)) | |
3309 | return -EINVAL; | |
3310 | ||
d49d91d7 VY |
3311 | sctp_sk(sk)->pd_point = val; |
3312 | ||
3313 | return 0; /* is this the right error code? */ | |
3314 | } | |
3315 | ||
70331571 VY |
3316 | /* |
3317 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3318 | * | |
3319 | * This option will allow a user to change the maximum burst of packets | |
3320 | * that can be emitted by this association. Note that the default value | |
3321 | * is 4, and some implementations may restrict this setting so that it | |
3322 | * can only be lowered. | |
3323 | * | |
3324 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3325 | * future associations inheriting the socket value. | |
3326 | */ | |
3327 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3328 | char __user *optval, | |
b7058842 | 3329 | unsigned int optlen) |
70331571 | 3330 | { |
219b99a9 NH |
3331 | struct sctp_assoc_value params; |
3332 | struct sctp_sock *sp; | |
3333 | struct sctp_association *asoc; | |
70331571 | 3334 | int val; |
219b99a9 | 3335 | int assoc_id = 0; |
70331571 | 3336 | |
219b99a9 | 3337 | if (optlen == sizeof(int)) { |
94f65193 | 3338 | pr_warn_ratelimited(DEPRECATED |
f916ec96 | 3339 | "%s (pid %d) " |
94f65193 | 3340 | "Use of int in max_burst socket option deprecated.\n" |
f916ec96 NH |
3341 | "Use struct sctp_assoc_value instead\n", |
3342 | current->comm, task_pid_nr(current)); | |
219b99a9 NH |
3343 | if (copy_from_user(&val, optval, optlen)) |
3344 | return -EFAULT; | |
3345 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3346 | if (copy_from_user(¶ms, optval, optlen)) | |
3347 | return -EFAULT; | |
3348 | val = params.assoc_value; | |
3349 | assoc_id = params.assoc_id; | |
3350 | } else | |
70331571 VY |
3351 | return -EINVAL; |
3352 | ||
219b99a9 NH |
3353 | sp = sctp_sk(sk); |
3354 | ||
3355 | if (assoc_id != 0) { | |
3356 | asoc = sctp_id2assoc(sk, assoc_id); | |
3357 | if (!asoc) | |
3358 | return -EINVAL; | |
3359 | asoc->max_burst = val; | |
3360 | } else | |
3361 | sp->max_burst = val; | |
70331571 VY |
3362 | |
3363 | return 0; | |
3364 | } | |
3365 | ||
65b07e5d VY |
3366 | /* |
3367 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3368 | * | |
3369 | * This set option adds a chunk type that the user is requesting to be | |
3370 | * received only in an authenticated way. Changes to the list of chunks | |
3371 | * will only effect future associations on the socket. | |
3372 | */ | |
3373 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3374 | char __user *optval, |
3375 | unsigned int optlen) | |
65b07e5d | 3376 | { |
b14878cc | 3377 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
65b07e5d VY |
3378 | struct sctp_authchunk val; |
3379 | ||
b14878cc | 3380 | if (!ep->auth_enable) |
5e739d17 VY |
3381 | return -EACCES; |
3382 | ||
65b07e5d VY |
3383 | if (optlen != sizeof(struct sctp_authchunk)) |
3384 | return -EINVAL; | |
3385 | if (copy_from_user(&val, optval, optlen)) | |
3386 | return -EFAULT; | |
3387 | ||
3388 | switch (val.sauth_chunk) { | |
7fd71b1e JP |
3389 | case SCTP_CID_INIT: |
3390 | case SCTP_CID_INIT_ACK: | |
3391 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3392 | case SCTP_CID_AUTH: | |
3393 | return -EINVAL; | |
65b07e5d VY |
3394 | } |
3395 | ||
3396 | /* add this chunk id to the endpoint */ | |
b14878cc | 3397 | return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk); |
65b07e5d VY |
3398 | } |
3399 | ||
3400 | /* | |
3401 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3402 | * | |
3403 | * This option gets or sets the list of HMAC algorithms that the local | |
3404 | * endpoint requires the peer to use. | |
3405 | */ | |
3406 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3407 | char __user *optval, |
3408 | unsigned int optlen) | |
65b07e5d | 3409 | { |
b14878cc | 3410 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
65b07e5d | 3411 | struct sctp_hmacalgo *hmacs; |
d9724055 | 3412 | u32 idents; |
65b07e5d VY |
3413 | int err; |
3414 | ||
b14878cc | 3415 | if (!ep->auth_enable) |
5e739d17 VY |
3416 | return -EACCES; |
3417 | ||
65b07e5d VY |
3418 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3419 | return -EINVAL; | |
3420 | ||
cb3f837b | 3421 | hmacs = memdup_user(optval, optlen); |
934253a7 SW |
3422 | if (IS_ERR(hmacs)) |
3423 | return PTR_ERR(hmacs); | |
65b07e5d | 3424 | |
d9724055 VY |
3425 | idents = hmacs->shmac_num_idents; |
3426 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3427 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3428 | err = -EINVAL; |
3429 | goto out; | |
3430 | } | |
3431 | ||
b14878cc | 3432 | err = sctp_auth_ep_set_hmacs(ep, hmacs); |
65b07e5d VY |
3433 | out: |
3434 | kfree(hmacs); | |
3435 | return err; | |
3436 | } | |
3437 | ||
3438 | /* | |
3439 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3440 | * | |
3441 | * This option will set a shared secret key which is used to build an | |
3442 | * association shared key. | |
3443 | */ | |
3444 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3445 | char __user *optval, | |
b7058842 | 3446 | unsigned int optlen) |
65b07e5d | 3447 | { |
b14878cc | 3448 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
65b07e5d VY |
3449 | struct sctp_authkey *authkey; |
3450 | struct sctp_association *asoc; | |
3451 | int ret; | |
3452 | ||
b14878cc | 3453 | if (!ep->auth_enable) |
5e739d17 VY |
3454 | return -EACCES; |
3455 | ||
65b07e5d VY |
3456 | if (optlen <= sizeof(struct sctp_authkey)) |
3457 | return -EINVAL; | |
3458 | ||
cb3f837b | 3459 | authkey = memdup_user(optval, optlen); |
934253a7 SW |
3460 | if (IS_ERR(authkey)) |
3461 | return PTR_ERR(authkey); | |
65b07e5d | 3462 | |
328fc47e | 3463 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3464 | ret = -EINVAL; |
3465 | goto out; | |
3466 | } | |
3467 | ||
65b07e5d VY |
3468 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3469 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3470 | ret = -EINVAL; | |
3471 | goto out; | |
3472 | } | |
3473 | ||
b14878cc | 3474 | ret = sctp_auth_set_key(ep, asoc, authkey); |
65b07e5d | 3475 | out: |
6ba542a2 | 3476 | kzfree(authkey); |
65b07e5d VY |
3477 | return ret; |
3478 | } | |
3479 | ||
3480 | /* | |
3481 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3482 | * | |
3483 | * This option will get or set the active shared key to be used to build | |
3484 | * the association shared key. | |
3485 | */ | |
3486 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3487 | char __user *optval, |
3488 | unsigned int optlen) | |
65b07e5d | 3489 | { |
b14878cc | 3490 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
65b07e5d VY |
3491 | struct sctp_authkeyid val; |
3492 | struct sctp_association *asoc; | |
3493 | ||
b14878cc | 3494 | if (!ep->auth_enable) |
5e739d17 VY |
3495 | return -EACCES; |
3496 | ||
65b07e5d VY |
3497 | if (optlen != sizeof(struct sctp_authkeyid)) |
3498 | return -EINVAL; | |
3499 | if (copy_from_user(&val, optval, optlen)) | |
3500 | return -EFAULT; | |
3501 | ||
3502 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3503 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3504 | return -EINVAL; | |
3505 | ||
b14878cc | 3506 | return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber); |
65b07e5d VY |
3507 | } |
3508 | ||
3509 | /* | |
3510 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3511 | * | |
3512 | * This set option will delete a shared secret key from use. | |
3513 | */ | |
3514 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3515 | char __user *optval, |
3516 | unsigned int optlen) | |
65b07e5d | 3517 | { |
b14878cc | 3518 | struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
65b07e5d VY |
3519 | struct sctp_authkeyid val; |
3520 | struct sctp_association *asoc; | |
3521 | ||
b14878cc | 3522 | if (!ep->auth_enable) |
5e739d17 VY |
3523 | return -EACCES; |
3524 | ||
65b07e5d VY |
3525 | if (optlen != sizeof(struct sctp_authkeyid)) |
3526 | return -EINVAL; | |
3527 | if (copy_from_user(&val, optval, optlen)) | |
3528 | return -EFAULT; | |
3529 | ||
3530 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3531 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3532 | return -EINVAL; | |
3533 | ||
b14878cc | 3534 | return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber); |
65b07e5d VY |
3535 | |
3536 | } | |
3537 | ||
7dc04d71 MH |
3538 | /* |
3539 | * 8.1.23 SCTP_AUTO_ASCONF | |
3540 | * | |
3541 | * This option will enable or disable the use of the automatic generation of | |
3542 | * ASCONF chunks to add and delete addresses to an existing association. Note | |
3543 | * that this option has two caveats namely: a) it only affects sockets that | |
3544 | * are bound to all addresses available to the SCTP stack, and b) the system | |
3545 | * administrator may have an overriding control that turns the ASCONF feature | |
3546 | * off no matter what setting the socket option may have. | |
3547 | * This option expects an integer boolean flag, where a non-zero value turns on | |
3548 | * the option, and a zero value turns off the option. | |
3549 | * Note. In this implementation, socket operation overrides default parameter | |
3550 | * being set by sysctl as well as FreeBSD implementation | |
3551 | */ | |
3552 | static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval, | |
3553 | unsigned int optlen) | |
3554 | { | |
3555 | int val; | |
3556 | struct sctp_sock *sp = sctp_sk(sk); | |
3557 | ||
3558 | if (optlen < sizeof(int)) | |
3559 | return -EINVAL; | |
3560 | if (get_user(val, (int __user *)optval)) | |
3561 | return -EFAULT; | |
3562 | if (!sctp_is_ep_boundall(sk) && val) | |
3563 | return -EINVAL; | |
3564 | if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf)) | |
3565 | return 0; | |
3566 | ||
2d45a02d | 3567 | spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock); |
7dc04d71 MH |
3568 | if (val == 0 && sp->do_auto_asconf) { |
3569 | list_del(&sp->auto_asconf_list); | |
3570 | sp->do_auto_asconf = 0; | |
3571 | } else if (val && !sp->do_auto_asconf) { | |
3572 | list_add_tail(&sp->auto_asconf_list, | |
4db67e80 | 3573 | &sock_net(sk)->sctp.auto_asconf_splist); |
7dc04d71 MH |
3574 | sp->do_auto_asconf = 1; |
3575 | } | |
2d45a02d | 3576 | spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock); |
7dc04d71 MH |
3577 | return 0; |
3578 | } | |
3579 | ||
5aa93bcf NH |
3580 | /* |
3581 | * SCTP_PEER_ADDR_THLDS | |
3582 | * | |
3583 | * This option allows us to alter the partially failed threshold for one or all | |
3584 | * transports in an association. See Section 6.1 of: | |
3585 | * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt | |
3586 | */ | |
3587 | static int sctp_setsockopt_paddr_thresholds(struct sock *sk, | |
3588 | char __user *optval, | |
3589 | unsigned int optlen) | |
3590 | { | |
3591 | struct sctp_paddrthlds val; | |
3592 | struct sctp_transport *trans; | |
3593 | struct sctp_association *asoc; | |
3594 | ||
3595 | if (optlen < sizeof(struct sctp_paddrthlds)) | |
3596 | return -EINVAL; | |
3597 | if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, | |
3598 | sizeof(struct sctp_paddrthlds))) | |
3599 | return -EFAULT; | |
3600 | ||
3601 | ||
3602 | if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) { | |
3603 | asoc = sctp_id2assoc(sk, val.spt_assoc_id); | |
3604 | if (!asoc) | |
3605 | return -ENOENT; | |
3606 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
3607 | transports) { | |
3608 | if (val.spt_pathmaxrxt) | |
3609 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3610 | trans->pf_retrans = val.spt_pathpfthld; | |
3611 | } | |
3612 | ||
3613 | if (val.spt_pathmaxrxt) | |
3614 | asoc->pathmaxrxt = val.spt_pathmaxrxt; | |
3615 | asoc->pf_retrans = val.spt_pathpfthld; | |
3616 | } else { | |
3617 | trans = sctp_addr_id2transport(sk, &val.spt_address, | |
3618 | val.spt_assoc_id); | |
3619 | if (!trans) | |
3620 | return -ENOENT; | |
3621 | ||
3622 | if (val.spt_pathmaxrxt) | |
3623 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3624 | trans->pf_retrans = val.spt_pathpfthld; | |
3625 | } | |
3626 | ||
3627 | return 0; | |
3628 | } | |
3629 | ||
0d3a421d GOV |
3630 | static int sctp_setsockopt_recvrcvinfo(struct sock *sk, |
3631 | char __user *optval, | |
3632 | unsigned int optlen) | |
3633 | { | |
3634 | int val; | |
3635 | ||
3636 | if (optlen < sizeof(int)) | |
3637 | return -EINVAL; | |
3638 | if (get_user(val, (int __user *) optval)) | |
3639 | return -EFAULT; | |
3640 | ||
3641 | sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1; | |
3642 | ||
3643 | return 0; | |
3644 | } | |
3645 | ||
2347c80f GOV |
3646 | static int sctp_setsockopt_recvnxtinfo(struct sock *sk, |
3647 | char __user *optval, | |
3648 | unsigned int optlen) | |
3649 | { | |
3650 | int val; | |
3651 | ||
3652 | if (optlen < sizeof(int)) | |
3653 | return -EINVAL; | |
3654 | if (get_user(val, (int __user *) optval)) | |
3655 | return -EFAULT; | |
3656 | ||
3657 | sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1; | |
3658 | ||
3659 | return 0; | |
3660 | } | |
3661 | ||
1da177e4 LT |
3662 | /* API 6.2 setsockopt(), getsockopt() |
3663 | * | |
3664 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3665 | * socket options. Socket options are used to change the default | |
3666 | * behavior of sockets calls. They are described in Section 7. | |
3667 | * | |
3668 | * The syntax is: | |
3669 | * | |
3670 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3671 | * int __user *optlen); | |
3672 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3673 | * int optlen); | |
3674 | * | |
3675 | * sd - the socket descript. | |
3676 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3677 | * optname - the option name. | |
3678 | * optval - the buffer to store the value of the option. | |
3679 | * optlen - the size of the buffer. | |
3680 | */ | |
dda91928 DB |
3681 | static int sctp_setsockopt(struct sock *sk, int level, int optname, |
3682 | char __user *optval, unsigned int optlen) | |
1da177e4 LT |
3683 | { |
3684 | int retval = 0; | |
3685 | ||
bb33381d | 3686 | pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname); |
1da177e4 LT |
3687 | |
3688 | /* I can hardly begin to describe how wrong this is. This is | |
3689 | * so broken as to be worse than useless. The API draft | |
3690 | * REALLY is NOT helpful here... I am not convinced that the | |
3691 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3692 | * are at all well-founded. | |
3693 | */ | |
3694 | if (level != SOL_SCTP) { | |
3695 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3696 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3697 | goto out_nounlock; | |
3698 | } | |
3699 | ||
048ed4b6 | 3700 | lock_sock(sk); |
1da177e4 LT |
3701 | |
3702 | switch (optname) { | |
3703 | case SCTP_SOCKOPT_BINDX_ADD: | |
3704 | /* 'optlen' is the size of the addresses buffer. */ | |
3705 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3706 | optlen, SCTP_BINDX_ADD_ADDR); | |
3707 | break; | |
3708 | ||
3709 | case SCTP_SOCKOPT_BINDX_REM: | |
3710 | /* 'optlen' is the size of the addresses buffer. */ | |
3711 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3712 | optlen, SCTP_BINDX_REM_ADDR); | |
3713 | break; | |
3714 | ||
88a0a948 VY |
3715 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3716 | /* 'optlen' is the size of the addresses buffer. */ | |
3717 | retval = sctp_setsockopt_connectx_old(sk, | |
3718 | (struct sockaddr __user *)optval, | |
3719 | optlen); | |
3720 | break; | |
3721 | ||
3f7a87d2 FF |
3722 | case SCTP_SOCKOPT_CONNECTX: |
3723 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3724 | retval = sctp_setsockopt_connectx(sk, |
3725 | (struct sockaddr __user *)optval, | |
3726 | optlen); | |
3f7a87d2 FF |
3727 | break; |
3728 | ||
1da177e4 LT |
3729 | case SCTP_DISABLE_FRAGMENTS: |
3730 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3731 | break; | |
3732 | ||
3733 | case SCTP_EVENTS: | |
3734 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3735 | break; | |
3736 | ||
3737 | case SCTP_AUTOCLOSE: | |
3738 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3739 | break; | |
3740 | ||
3741 | case SCTP_PEER_ADDR_PARAMS: | |
3742 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3743 | break; | |
3744 | ||
4580ccc0 | 3745 | case SCTP_DELAYED_SACK: |
d364d927 | 3746 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3747 | break; |
d49d91d7 VY |
3748 | case SCTP_PARTIAL_DELIVERY_POINT: |
3749 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3750 | break; | |
7708610b | 3751 | |
1da177e4 LT |
3752 | case SCTP_INITMSG: |
3753 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3754 | break; | |
3755 | case SCTP_DEFAULT_SEND_PARAM: | |
3756 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3757 | optlen); | |
3758 | break; | |
6b3fd5f3 GOV |
3759 | case SCTP_DEFAULT_SNDINFO: |
3760 | retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen); | |
3761 | break; | |
1da177e4 LT |
3762 | case SCTP_PRIMARY_ADDR: |
3763 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3764 | break; | |
3765 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3766 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3767 | break; | |
3768 | case SCTP_NODELAY: | |
3769 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3770 | break; | |
3771 | case SCTP_RTOINFO: | |
3772 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3773 | break; | |
3774 | case SCTP_ASSOCINFO: | |
3775 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3776 | break; | |
3777 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3778 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3779 | break; | |
3780 | case SCTP_MAXSEG: | |
3781 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3782 | break; | |
0f3fffd8 ISJ |
3783 | case SCTP_ADAPTATION_LAYER: |
3784 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3785 | break; |
6ab792f5 ISJ |
3786 | case SCTP_CONTEXT: |
3787 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3788 | break; | |
b6e1331f VY |
3789 | case SCTP_FRAGMENT_INTERLEAVE: |
3790 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3791 | break; | |
70331571 VY |
3792 | case SCTP_MAX_BURST: |
3793 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3794 | break; | |
65b07e5d VY |
3795 | case SCTP_AUTH_CHUNK: |
3796 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3797 | break; | |
3798 | case SCTP_HMAC_IDENT: | |
3799 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3800 | break; | |
3801 | case SCTP_AUTH_KEY: | |
3802 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3803 | break; | |
3804 | case SCTP_AUTH_ACTIVE_KEY: | |
3805 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3806 | break; | |
3807 | case SCTP_AUTH_DELETE_KEY: | |
3808 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3809 | break; | |
7dc04d71 MH |
3810 | case SCTP_AUTO_ASCONF: |
3811 | retval = sctp_setsockopt_auto_asconf(sk, optval, optlen); | |
3812 | break; | |
5aa93bcf NH |
3813 | case SCTP_PEER_ADDR_THLDS: |
3814 | retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen); | |
3815 | break; | |
0d3a421d GOV |
3816 | case SCTP_RECVRCVINFO: |
3817 | retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen); | |
3818 | break; | |
2347c80f GOV |
3819 | case SCTP_RECVNXTINFO: |
3820 | retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen); | |
3821 | break; | |
1da177e4 LT |
3822 | default: |
3823 | retval = -ENOPROTOOPT; | |
3824 | break; | |
3ff50b79 | 3825 | } |
1da177e4 | 3826 | |
048ed4b6 | 3827 | release_sock(sk); |
1da177e4 LT |
3828 | |
3829 | out_nounlock: | |
3830 | return retval; | |
3831 | } | |
3832 | ||
3833 | /* API 3.1.6 connect() - UDP Style Syntax | |
3834 | * | |
3835 | * An application may use the connect() call in the UDP model to initiate an | |
3836 | * association without sending data. | |
3837 | * | |
3838 | * The syntax is: | |
3839 | * | |
3840 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3841 | * | |
3842 | * sd: the socket descriptor to have a new association added to. | |
3843 | * | |
3844 | * nam: the address structure (either struct sockaddr_in or struct | |
3845 | * sockaddr_in6 defined in RFC2553 [7]). | |
3846 | * | |
3847 | * len: the size of the address. | |
3848 | */ | |
dda91928 DB |
3849 | static int sctp_connect(struct sock *sk, struct sockaddr *addr, |
3850 | int addr_len) | |
1da177e4 | 3851 | { |
1da177e4 | 3852 | int err = 0; |
3f7a87d2 | 3853 | struct sctp_af *af; |
1da177e4 | 3854 | |
048ed4b6 | 3855 | lock_sock(sk); |
1da177e4 | 3856 | |
bb33381d DB |
3857 | pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk, |
3858 | addr, addr_len); | |
1da177e4 | 3859 | |
3f7a87d2 FF |
3860 | /* Validate addr_len before calling common connect/connectx routine. */ |
3861 | af = sctp_get_af_specific(addr->sa_family); | |
3862 | if (!af || addr_len < af->sockaddr_len) { | |
3863 | err = -EINVAL; | |
3864 | } else { | |
3865 | /* Pass correct addr len to common routine (so it knows there | |
3866 | * is only one address being passed. | |
3867 | */ | |
88a0a948 | 3868 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3869 | } |
3870 | ||
048ed4b6 | 3871 | release_sock(sk); |
1da177e4 LT |
3872 | return err; |
3873 | } | |
3874 | ||
3875 | /* FIXME: Write comments. */ | |
dda91928 | 3876 | static int sctp_disconnect(struct sock *sk, int flags) |
1da177e4 LT |
3877 | { |
3878 | return -EOPNOTSUPP; /* STUB */ | |
3879 | } | |
3880 | ||
3881 | /* 4.1.4 accept() - TCP Style Syntax | |
3882 | * | |
3883 | * Applications use accept() call to remove an established SCTP | |
3884 | * association from the accept queue of the endpoint. A new socket | |
3885 | * descriptor will be returned from accept() to represent the newly | |
3886 | * formed association. | |
3887 | */ | |
dda91928 | 3888 | static struct sock *sctp_accept(struct sock *sk, int flags, int *err) |
1da177e4 LT |
3889 | { |
3890 | struct sctp_sock *sp; | |
3891 | struct sctp_endpoint *ep; | |
3892 | struct sock *newsk = NULL; | |
3893 | struct sctp_association *asoc; | |
3894 | long timeo; | |
3895 | int error = 0; | |
3896 | ||
048ed4b6 | 3897 | lock_sock(sk); |
1da177e4 LT |
3898 | |
3899 | sp = sctp_sk(sk); | |
3900 | ep = sp->ep; | |
3901 | ||
3902 | if (!sctp_style(sk, TCP)) { | |
3903 | error = -EOPNOTSUPP; | |
3904 | goto out; | |
3905 | } | |
3906 | ||
3907 | if (!sctp_sstate(sk, LISTENING)) { | |
3908 | error = -EINVAL; | |
3909 | goto out; | |
3910 | } | |
3911 | ||
8abfedd8 | 3912 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3913 | |
3914 | error = sctp_wait_for_accept(sk, timeo); | |
3915 | if (error) | |
3916 | goto out; | |
3917 | ||
3918 | /* We treat the list of associations on the endpoint as the accept | |
3919 | * queue and pick the first association on the list. | |
3920 | */ | |
3921 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3922 | ||
3923 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3924 | if (!newsk) { | |
3925 | error = -ENOMEM; | |
3926 | goto out; | |
3927 | } | |
3928 | ||
3929 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3930 | * asoc to the newsk. | |
3931 | */ | |
3932 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3933 | ||
3934 | out: | |
048ed4b6 | 3935 | release_sock(sk); |
d808ad9a | 3936 | *err = error; |
1da177e4 LT |
3937 | return newsk; |
3938 | } | |
3939 | ||
3940 | /* The SCTP ioctl handler. */ | |
dda91928 | 3941 | static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1da177e4 | 3942 | { |
65040c33 DEFP |
3943 | int rc = -ENOTCONN; |
3944 | ||
048ed4b6 | 3945 | lock_sock(sk); |
65040c33 DEFP |
3946 | |
3947 | /* | |
3948 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3949 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3950 | */ | |
3951 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3952 | goto out; | |
3953 | ||
3954 | switch (cmd) { | |
3955 | case SIOCINQ: { | |
3956 | struct sk_buff *skb; | |
3957 | unsigned int amount = 0; | |
3958 | ||
3959 | skb = skb_peek(&sk->sk_receive_queue); | |
3960 | if (skb != NULL) { | |
3961 | /* | |
3962 | * We will only return the amount of this packet since | |
3963 | * that is all that will be read. | |
3964 | */ | |
3965 | amount = skb->len; | |
3966 | } | |
3967 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3968 | break; |
9a7241c2 | 3969 | } |
65040c33 DEFP |
3970 | default: |
3971 | rc = -ENOIOCTLCMD; | |
3972 | break; | |
3973 | } | |
3974 | out: | |
048ed4b6 | 3975 | release_sock(sk); |
65040c33 | 3976 | return rc; |
1da177e4 LT |
3977 | } |
3978 | ||
3979 | /* This is the function which gets called during socket creation to | |
3980 | * initialized the SCTP-specific portion of the sock. | |
3981 | * The sock structure should already be zero-filled memory. | |
3982 | */ | |
dda91928 | 3983 | static int sctp_init_sock(struct sock *sk) |
1da177e4 | 3984 | { |
e1fc3b14 | 3985 | struct net *net = sock_net(sk); |
1da177e4 LT |
3986 | struct sctp_sock *sp; |
3987 | ||
bb33381d | 3988 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
3989 | |
3990 | sp = sctp_sk(sk); | |
3991 | ||
3992 | /* Initialize the SCTP per socket area. */ | |
3993 | switch (sk->sk_type) { | |
3994 | case SOCK_SEQPACKET: | |
3995 | sp->type = SCTP_SOCKET_UDP; | |
3996 | break; | |
3997 | case SOCK_STREAM: | |
3998 | sp->type = SCTP_SOCKET_TCP; | |
3999 | break; | |
4000 | default: | |
4001 | return -ESOCKTNOSUPPORT; | |
4002 | } | |
4003 | ||
4004 | /* Initialize default send parameters. These parameters can be | |
4005 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
4006 | */ | |
4007 | sp->default_stream = 0; | |
4008 | sp->default_ppid = 0; | |
4009 | sp->default_flags = 0; | |
4010 | sp->default_context = 0; | |
4011 | sp->default_timetolive = 0; | |
4012 | ||
6ab792f5 | 4013 | sp->default_rcv_context = 0; |
e1fc3b14 | 4014 | sp->max_burst = net->sctp.max_burst; |
6ab792f5 | 4015 | |
3c68198e NH |
4016 | sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg; |
4017 | ||
1da177e4 LT |
4018 | /* Initialize default setup parameters. These parameters |
4019 | * can be modified with the SCTP_INITMSG socket option or | |
4020 | * overridden by the SCTP_INIT CMSG. | |
4021 | */ | |
4022 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
4023 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
e1fc3b14 EB |
4024 | sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init; |
4025 | sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max; | |
1da177e4 LT |
4026 | |
4027 | /* Initialize default RTO related parameters. These parameters can | |
4028 | * be modified for with the SCTP_RTOINFO socket option. | |
4029 | */ | |
e1fc3b14 EB |
4030 | sp->rtoinfo.srto_initial = net->sctp.rto_initial; |
4031 | sp->rtoinfo.srto_max = net->sctp.rto_max; | |
4032 | sp->rtoinfo.srto_min = net->sctp.rto_min; | |
1da177e4 LT |
4033 | |
4034 | /* Initialize default association related parameters. These parameters | |
4035 | * can be modified with the SCTP_ASSOCINFO socket option. | |
4036 | */ | |
e1fc3b14 | 4037 | sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association; |
1da177e4 LT |
4038 | sp->assocparams.sasoc_number_peer_destinations = 0; |
4039 | sp->assocparams.sasoc_peer_rwnd = 0; | |
4040 | sp->assocparams.sasoc_local_rwnd = 0; | |
e1fc3b14 | 4041 | sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life; |
1da177e4 LT |
4042 | |
4043 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 4044 | * options are off. |
1da177e4 LT |
4045 | */ |
4046 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
4047 | ||
4048 | /* Default Peer Address Parameters. These defaults can | |
4049 | * be modified via SCTP_PEER_ADDR_PARAMS | |
4050 | */ | |
e1fc3b14 EB |
4051 | sp->hbinterval = net->sctp.hb_interval; |
4052 | sp->pathmaxrxt = net->sctp.max_retrans_path; | |
4e2d52bf | 4053 | sp->pathmtu = 0; /* allow default discovery */ |
e1fc3b14 | 4054 | sp->sackdelay = net->sctp.sack_timeout; |
7bfe8bdb | 4055 | sp->sackfreq = 2; |
52ccb8e9 | 4056 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
4057 | SPP_PMTUD_ENABLE | |
4058 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
4059 | |
4060 | /* If enabled no SCTP message fragmentation will be performed. | |
4061 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
4062 | */ | |
4063 | sp->disable_fragments = 0; | |
4064 | ||
208edef6 SS |
4065 | /* Enable Nagle algorithm by default. */ |
4066 | sp->nodelay = 0; | |
1da177e4 | 4067 | |
0d3a421d | 4068 | sp->recvrcvinfo = 0; |
2347c80f | 4069 | sp->recvnxtinfo = 0; |
0d3a421d | 4070 | |
1da177e4 LT |
4071 | /* Enable by default. */ |
4072 | sp->v4mapped = 1; | |
4073 | ||
4074 | /* Auto-close idle associations after the configured | |
4075 | * number of seconds. A value of 0 disables this | |
4076 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
4077 | * for UDP-style sockets only. | |
4078 | */ | |
4079 | sp->autoclose = 0; | |
4080 | ||
4081 | /* User specified fragmentation limit. */ | |
4082 | sp->user_frag = 0; | |
4083 | ||
0f3fffd8 | 4084 | sp->adaptation_ind = 0; |
1da177e4 LT |
4085 | |
4086 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
4087 | ||
4088 | /* Control variables for partial data delivery. */ | |
b6e1331f | 4089 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 4090 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 4091 | sp->frag_interleave = 0; |
1da177e4 LT |
4092 | |
4093 | /* Create a per socket endpoint structure. Even if we | |
4094 | * change the data structure relationships, this may still | |
4095 | * be useful for storing pre-connect address information. | |
4096 | */ | |
c164b838 DB |
4097 | sp->ep = sctp_endpoint_new(sk, GFP_KERNEL); |
4098 | if (!sp->ep) | |
1da177e4 LT |
4099 | return -ENOMEM; |
4100 | ||
1da177e4 LT |
4101 | sp->hmac = NULL; |
4102 | ||
0a2fbac1 DB |
4103 | sk->sk_destruct = sctp_destruct_sock; |
4104 | ||
1da177e4 | 4105 | SCTP_DBG_OBJCNT_INC(sock); |
6f756a8c DM |
4106 | |
4107 | local_bh_disable(); | |
81419d86 | 4108 | percpu_counter_inc(&sctp_sockets_allocated); |
e1fc3b14 | 4109 | sock_prot_inuse_add(net, sk->sk_prot, 1); |
2d45a02d MRL |
4110 | |
4111 | /* Nothing can fail after this block, otherwise | |
4112 | * sctp_destroy_sock() will be called without addr_wq_lock held | |
4113 | */ | |
e1fc3b14 | 4114 | if (net->sctp.default_auto_asconf) { |
2d45a02d | 4115 | spin_lock(&sock_net(sk)->sctp.addr_wq_lock); |
9f7d653b | 4116 | list_add_tail(&sp->auto_asconf_list, |
e1fc3b14 | 4117 | &net->sctp.auto_asconf_splist); |
9f7d653b | 4118 | sp->do_auto_asconf = 1; |
2d45a02d MRL |
4119 | spin_unlock(&sock_net(sk)->sctp.addr_wq_lock); |
4120 | } else { | |
9f7d653b | 4121 | sp->do_auto_asconf = 0; |
2d45a02d MRL |
4122 | } |
4123 | ||
6f756a8c DM |
4124 | local_bh_enable(); |
4125 | ||
1da177e4 LT |
4126 | return 0; |
4127 | } | |
4128 | ||
2d45a02d MRL |
4129 | /* Cleanup any SCTP per socket resources. Must be called with |
4130 | * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true | |
4131 | */ | |
dda91928 | 4132 | static void sctp_destroy_sock(struct sock *sk) |
1da177e4 | 4133 | { |
9f7d653b | 4134 | struct sctp_sock *sp; |
1da177e4 | 4135 | |
bb33381d | 4136 | pr_debug("%s: sk:%p\n", __func__, sk); |
1da177e4 LT |
4137 | |
4138 | /* Release our hold on the endpoint. */ | |
9f7d653b | 4139 | sp = sctp_sk(sk); |
1abd165e DB |
4140 | /* This could happen during socket init, thus we bail out |
4141 | * early, since the rest of the below is not setup either. | |
4142 | */ | |
4143 | if (sp->ep == NULL) | |
4144 | return; | |
4145 | ||
9f7d653b MH |
4146 | if (sp->do_auto_asconf) { |
4147 | sp->do_auto_asconf = 0; | |
4148 | list_del(&sp->auto_asconf_list); | |
4149 | } | |
4150 | sctp_endpoint_free(sp->ep); | |
5bc0b3bf | 4151 | local_bh_disable(); |
81419d86 | 4152 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 4153 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 4154 | local_bh_enable(); |
1da177e4 LT |
4155 | } |
4156 | ||
0a2fbac1 DB |
4157 | /* Triggered when there are no references on the socket anymore */ |
4158 | static void sctp_destruct_sock(struct sock *sk) | |
4159 | { | |
4160 | struct sctp_sock *sp = sctp_sk(sk); | |
4161 | ||
4162 | /* Free up the HMAC transform. */ | |
4163 | crypto_free_hash(sp->hmac); | |
4164 | ||
4165 | inet_sock_destruct(sk); | |
4166 | } | |
4167 | ||
1da177e4 LT |
4168 | /* API 4.1.7 shutdown() - TCP Style Syntax |
4169 | * int shutdown(int socket, int how); | |
4170 | * | |
4171 | * sd - the socket descriptor of the association to be closed. | |
4172 | * how - Specifies the type of shutdown. The values are | |
4173 | * as follows: | |
4174 | * SHUT_RD | |
4175 | * Disables further receive operations. No SCTP | |
4176 | * protocol action is taken. | |
4177 | * SHUT_WR | |
4178 | * Disables further send operations, and initiates | |
4179 | * the SCTP shutdown sequence. | |
4180 | * SHUT_RDWR | |
4181 | * Disables further send and receive operations | |
4182 | * and initiates the SCTP shutdown sequence. | |
4183 | */ | |
dda91928 | 4184 | static void sctp_shutdown(struct sock *sk, int how) |
1da177e4 | 4185 | { |
55e26eb9 | 4186 | struct net *net = sock_net(sk); |
1da177e4 LT |
4187 | struct sctp_endpoint *ep; |
4188 | struct sctp_association *asoc; | |
4189 | ||
4190 | if (!sctp_style(sk, TCP)) | |
4191 | return; | |
4192 | ||
4193 | if (how & SEND_SHUTDOWN) { | |
4194 | ep = sctp_sk(sk)->ep; | |
4195 | if (!list_empty(&ep->asocs)) { | |
4196 | asoc = list_entry(ep->asocs.next, | |
4197 | struct sctp_association, asocs); | |
55e26eb9 | 4198 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
4199 | } |
4200 | } | |
4201 | } | |
4202 | ||
4203 | /* 7.2.1 Association Status (SCTP_STATUS) | |
4204 | ||
4205 | * Applications can retrieve current status information about an | |
4206 | * association, including association state, peer receiver window size, | |
4207 | * number of unacked data chunks, and number of data chunks pending | |
4208 | * receipt. This information is read-only. | |
4209 | */ | |
4210 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
4211 | char __user *optval, | |
4212 | int __user *optlen) | |
4213 | { | |
4214 | struct sctp_status status; | |
4215 | struct sctp_association *asoc = NULL; | |
4216 | struct sctp_transport *transport; | |
4217 | sctp_assoc_t associd; | |
4218 | int retval = 0; | |
4219 | ||
408f22e8 | 4220 | if (len < sizeof(status)) { |
1da177e4 LT |
4221 | retval = -EINVAL; |
4222 | goto out; | |
4223 | } | |
4224 | ||
408f22e8 NH |
4225 | len = sizeof(status); |
4226 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
4227 | retval = -EFAULT; |
4228 | goto out; | |
4229 | } | |
4230 | ||
4231 | associd = status.sstat_assoc_id; | |
4232 | asoc = sctp_id2assoc(sk, associd); | |
4233 | if (!asoc) { | |
4234 | retval = -EINVAL; | |
4235 | goto out; | |
4236 | } | |
4237 | ||
4238 | transport = asoc->peer.primary_path; | |
4239 | ||
4240 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
38ab1fa9 | 4241 | status.sstat_state = sctp_assoc_to_state(asoc); |
1da177e4 LT |
4242 | status.sstat_rwnd = asoc->peer.rwnd; |
4243 | status.sstat_unackdata = asoc->unack_data; | |
4244 | ||
4245 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
4246 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
4247 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
4248 | status.sstat_fragmentation_point = asoc->frag_point; | |
4249 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
4250 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
4251 | transport->af_specific->sockaddr_len); | |
1da177e4 | 4252 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
299ee123 | 4253 | sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk), |
1da177e4 | 4254 | (union sctp_addr *)&status.sstat_primary.spinfo_address); |
3f7a87d2 | 4255 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
4256 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
4257 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
4258 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4259 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4260 | |
3f7a87d2 FF |
4261 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
4262 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
4263 | ||
1da177e4 LT |
4264 | if (put_user(len, optlen)) { |
4265 | retval = -EFAULT; | |
4266 | goto out; | |
4267 | } | |
4268 | ||
bb33381d DB |
4269 | pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n", |
4270 | __func__, len, status.sstat_state, status.sstat_rwnd, | |
4271 | status.sstat_assoc_id); | |
1da177e4 LT |
4272 | |
4273 | if (copy_to_user(optval, &status, len)) { | |
4274 | retval = -EFAULT; | |
4275 | goto out; | |
4276 | } | |
4277 | ||
4278 | out: | |
a02cec21 | 4279 | return retval; |
1da177e4 LT |
4280 | } |
4281 | ||
4282 | ||
4283 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
4284 | * | |
4285 | * Applications can retrieve information about a specific peer address | |
4286 | * of an association, including its reachability state, congestion | |
4287 | * window, and retransmission timer values. This information is | |
4288 | * read-only. | |
4289 | */ | |
4290 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
4291 | char __user *optval, | |
4292 | int __user *optlen) | |
4293 | { | |
4294 | struct sctp_paddrinfo pinfo; | |
4295 | struct sctp_transport *transport; | |
4296 | int retval = 0; | |
4297 | ||
408f22e8 | 4298 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
4299 | retval = -EINVAL; |
4300 | goto out; | |
4301 | } | |
4302 | ||
408f22e8 NH |
4303 | len = sizeof(pinfo); |
4304 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
4305 | retval = -EFAULT; |
4306 | goto out; | |
4307 | } | |
4308 | ||
4309 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
4310 | pinfo.spinfo_assoc_id); | |
4311 | if (!transport) | |
4312 | return -EINVAL; | |
4313 | ||
4314 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 4315 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
4316 | pinfo.spinfo_cwnd = transport->cwnd; |
4317 | pinfo.spinfo_srtt = transport->srtt; | |
4318 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4319 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4320 | |
3f7a87d2 FF |
4321 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
4322 | pinfo.spinfo_state = SCTP_ACTIVE; | |
4323 | ||
1da177e4 LT |
4324 | if (put_user(len, optlen)) { |
4325 | retval = -EFAULT; | |
4326 | goto out; | |
4327 | } | |
4328 | ||
4329 | if (copy_to_user(optval, &pinfo, len)) { | |
4330 | retval = -EFAULT; | |
4331 | goto out; | |
4332 | } | |
4333 | ||
4334 | out: | |
a02cec21 | 4335 | return retval; |
1da177e4 LT |
4336 | } |
4337 | ||
4338 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
4339 | * | |
4340 | * This option is a on/off flag. If enabled no SCTP message | |
4341 | * fragmentation will be performed. Instead if a message being sent | |
4342 | * exceeds the current PMTU size, the message will NOT be sent and | |
4343 | * instead a error will be indicated to the user. | |
4344 | */ | |
4345 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
4346 | char __user *optval, int __user *optlen) | |
4347 | { | |
4348 | int val; | |
4349 | ||
4350 | if (len < sizeof(int)) | |
4351 | return -EINVAL; | |
4352 | ||
4353 | len = sizeof(int); | |
4354 | val = (sctp_sk(sk)->disable_fragments == 1); | |
4355 | if (put_user(len, optlen)) | |
4356 | return -EFAULT; | |
4357 | if (copy_to_user(optval, &val, len)) | |
4358 | return -EFAULT; | |
4359 | return 0; | |
4360 | } | |
4361 | ||
4362 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4363 | * | |
4364 | * This socket option is used to specify various notifications and | |
4365 | * ancillary data the user wishes to receive. | |
4366 | */ | |
4367 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4368 | int __user *optlen) | |
4369 | { | |
acdd5985 | 4370 | if (len <= 0) |
1da177e4 | 4371 | return -EINVAL; |
acdd5985 TG |
4372 | if (len > sizeof(struct sctp_event_subscribe)) |
4373 | len = sizeof(struct sctp_event_subscribe); | |
408f22e8 NH |
4374 | if (put_user(len, optlen)) |
4375 | return -EFAULT; | |
1da177e4 LT |
4376 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4377 | return -EFAULT; | |
4378 | return 0; | |
4379 | } | |
4380 | ||
4381 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4382 | * | |
4383 | * This socket option is applicable to the UDP-style socket only. When | |
4384 | * set it will cause associations that are idle for more than the | |
4385 | * specified number of seconds to automatically close. An association | |
4386 | * being idle is defined an association that has NOT sent or received | |
4387 | * user data. The special value of '0' indicates that no automatic | |
4388 | * close of any associations should be performed. The option expects an | |
4389 | * integer defining the number of seconds of idle time before an | |
4390 | * association is closed. | |
4391 | */ | |
4392 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4393 | { | |
4394 | /* Applicable to UDP-style socket only */ | |
4395 | if (sctp_style(sk, TCP)) | |
4396 | return -EOPNOTSUPP; | |
408f22e8 | 4397 | if (len < sizeof(int)) |
1da177e4 | 4398 | return -EINVAL; |
408f22e8 NH |
4399 | len = sizeof(int); |
4400 | if (put_user(len, optlen)) | |
4401 | return -EFAULT; | |
4402 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4403 | return -EFAULT; |
4404 | return 0; | |
4405 | } | |
4406 | ||
4407 | /* Helper routine to branch off an association to a new socket. */ | |
0343c554 | 4408 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp) |
1da177e4 | 4409 | { |
0343c554 | 4410 | struct sctp_association *asoc = sctp_id2assoc(sk, id); |
299ee123 | 4411 | struct sctp_sock *sp = sctp_sk(sk); |
1da177e4 LT |
4412 | struct socket *sock; |
4413 | int err = 0; | |
4414 | ||
0343c554 BP |
4415 | if (!asoc) |
4416 | return -EINVAL; | |
4417 | ||
1da177e4 LT |
4418 | /* An association cannot be branched off from an already peeled-off |
4419 | * socket, nor is this supported for tcp style sockets. | |
4420 | */ | |
4421 | if (!sctp_style(sk, UDP)) | |
4422 | return -EINVAL; | |
4423 | ||
4424 | /* Create a new socket. */ | |
4425 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4426 | if (err < 0) | |
4427 | return err; | |
4428 | ||
914e1c8b | 4429 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4430 | |
4431 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4432 | * Set the daddr and initialize id to something more random | |
4433 | */ | |
299ee123 | 4434 | sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk); |
914e1c8b VY |
4435 | |
4436 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4437 | * asoc to the newsk. | |
4438 | */ | |
4439 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4440 | |
1da177e4 LT |
4441 | *sockp = sock; |
4442 | ||
4443 | return err; | |
4444 | } | |
0343c554 | 4445 | EXPORT_SYMBOL(sctp_do_peeloff); |
1da177e4 LT |
4446 | |
4447 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4448 | { | |
4449 | sctp_peeloff_arg_t peeloff; | |
4450 | struct socket *newsock; | |
56b31d1c | 4451 | struct file *newfile; |
1da177e4 | 4452 | int retval = 0; |
1da177e4 | 4453 | |
408f22e8 | 4454 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4455 | return -EINVAL; |
408f22e8 | 4456 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4457 | if (copy_from_user(&peeloff, optval, len)) |
4458 | return -EFAULT; | |
4459 | ||
0343c554 | 4460 | retval = sctp_do_peeloff(sk, peeloff.associd, &newsock); |
1da177e4 LT |
4461 | if (retval < 0) |
4462 | goto out; | |
4463 | ||
4464 | /* Map the socket to an unused fd that can be returned to the user. */ | |
8a59bd3e | 4465 | retval = get_unused_fd_flags(0); |
1da177e4 LT |
4466 | if (retval < 0) { |
4467 | sock_release(newsock); | |
4468 | goto out; | |
4469 | } | |
4470 | ||
aab174f0 | 4471 | newfile = sock_alloc_file(newsock, 0, NULL); |
b5ffe634 | 4472 | if (IS_ERR(newfile)) { |
56b31d1c AV |
4473 | put_unused_fd(retval); |
4474 | sock_release(newsock); | |
4475 | return PTR_ERR(newfile); | |
4476 | } | |
4477 | ||
bb33381d DB |
4478 | pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk, |
4479 | retval); | |
1da177e4 LT |
4480 | |
4481 | /* Return the fd mapped to the new socket. */ | |
56b31d1c AV |
4482 | if (put_user(len, optlen)) { |
4483 | fput(newfile); | |
4484 | put_unused_fd(retval); | |
4485 | return -EFAULT; | |
4486 | } | |
1da177e4 | 4487 | peeloff.sd = retval; |
56b31d1c AV |
4488 | if (copy_to_user(optval, &peeloff, len)) { |
4489 | fput(newfile); | |
4490 | put_unused_fd(retval); | |
408f22e8 | 4491 | return -EFAULT; |
56b31d1c AV |
4492 | } |
4493 | fd_install(retval, newfile); | |
1da177e4 LT |
4494 | out: |
4495 | return retval; | |
4496 | } | |
4497 | ||
4498 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4499 | * | |
4500 | * Applications can enable or disable heartbeats for any peer address of | |
4501 | * an association, modify an address's heartbeat interval, force a | |
4502 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4503 | * number of retransmissions sent before an address is considered | |
4504 | * unreachable. The following structure is used to access and modify an | |
4505 | * address's parameters: | |
4506 | * | |
4507 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4508 | * sctp_assoc_t spp_assoc_id; |
4509 | * struct sockaddr_storage spp_address; | |
4510 | * uint32_t spp_hbinterval; | |
4511 | * uint16_t spp_pathmaxrxt; | |
4512 | * uint32_t spp_pathmtu; | |
4513 | * uint32_t spp_sackdelay; | |
4514 | * uint32_t spp_flags; | |
4515 | * }; | |
4516 | * | |
4517 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4518 | * application, and identifies the association for | |
4519 | * this query. | |
1da177e4 LT |
4520 | * spp_address - This specifies which address is of interest. |
4521 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4522 | * in milliseconds. If a value of zero |
4523 | * is present in this field then no changes are to | |
4524 | * be made to this parameter. | |
1da177e4 LT |
4525 | * spp_pathmaxrxt - This contains the maximum number of |
4526 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4527 | * considered unreachable. If a value of zero |
4528 | * is present in this field then no changes are to | |
4529 | * be made to this parameter. | |
4530 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4531 | * specified here will be the "fixed" path mtu. | |
4532 | * Note that if the spp_address field is empty | |
4533 | * then all associations on this address will | |
4534 | * have this fixed path mtu set upon them. | |
4535 | * | |
4536 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4537 | * the number of milliseconds that sacks will be delayed | |
4538 | * for. This value will apply to all addresses of an | |
4539 | * association if the spp_address field is empty. Note | |
4540 | * also, that if delayed sack is enabled and this | |
4541 | * value is set to 0, no change is made to the last | |
4542 | * recorded delayed sack timer value. | |
4543 | * | |
4544 | * spp_flags - These flags are used to control various features | |
4545 | * on an association. The flag field may contain | |
4546 | * zero or more of the following options. | |
4547 | * | |
4548 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4549 | * specified address. Note that if the address | |
4550 | * field is empty all addresses for the association | |
4551 | * have heartbeats enabled upon them. | |
4552 | * | |
4553 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4554 | * speicifed address. Note that if the address | |
4555 | * field is empty all addresses for the association | |
4556 | * will have their heartbeats disabled. Note also | |
4557 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4558 | * mutually exclusive, only one of these two should | |
4559 | * be specified. Enabling both fields will have | |
4560 | * undetermined results. | |
4561 | * | |
4562 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4563 | * to be made immediately. | |
4564 | * | |
4565 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4566 | * discovery upon the specified address. Note that | |
4567 | * if the address feild is empty then all addresses | |
4568 | * on the association are effected. | |
4569 | * | |
4570 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4571 | * discovery upon the specified address. Note that | |
4572 | * if the address feild is empty then all addresses | |
4573 | * on the association are effected. Not also that | |
4574 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4575 | * exclusive. Enabling both will have undetermined | |
4576 | * results. | |
4577 | * | |
4578 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4579 | * on delayed sack. The time specified in spp_sackdelay | |
4580 | * is used to specify the sack delay for this address. Note | |
4581 | * that if spp_address is empty then all addresses will | |
4582 | * enable delayed sack and take on the sack delay | |
4583 | * value specified in spp_sackdelay. | |
4584 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4585 | * off delayed sack. If the spp_address field is blank then | |
4586 | * delayed sack is disabled for the entire association. Note | |
4587 | * also that this field is mutually exclusive to | |
4588 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4589 | * results. | |
1da177e4 LT |
4590 | */ |
4591 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4592 | char __user *optval, int __user *optlen) |
1da177e4 | 4593 | { |
52ccb8e9 FF |
4594 | struct sctp_paddrparams params; |
4595 | struct sctp_transport *trans = NULL; | |
4596 | struct sctp_association *asoc = NULL; | |
4597 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4598 | |
408f22e8 | 4599 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4600 | return -EINVAL; |
408f22e8 | 4601 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4602 | if (copy_from_user(¶ms, optval, len)) |
4603 | return -EFAULT; | |
4604 | ||
52ccb8e9 FF |
4605 | /* If an address other than INADDR_ANY is specified, and |
4606 | * no transport is found, then the request is invalid. | |
1da177e4 | 4607 | */ |
cb3f837b | 4608 | if (!sctp_is_any(sk, (union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4609 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4610 | params.spp_assoc_id); | |
4611 | if (!trans) { | |
bb33381d | 4612 | pr_debug("%s: failed no transport\n", __func__); |
52ccb8e9 FF |
4613 | return -EINVAL; |
4614 | } | |
1da177e4 LT |
4615 | } |
4616 | ||
52ccb8e9 FF |
4617 | /* Get association, if assoc_id != 0 and the socket is a one |
4618 | * to many style socket, and an association was not found, then | |
4619 | * the id was invalid. | |
4620 | */ | |
4621 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4622 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
bb33381d | 4623 | pr_debug("%s: failed no association\n", __func__); |
1da177e4 | 4624 | return -EINVAL; |
52ccb8e9 | 4625 | } |
1da177e4 | 4626 | |
52ccb8e9 FF |
4627 | if (trans) { |
4628 | /* Fetch transport values. */ | |
4629 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4630 | params.spp_pathmtu = trans->pathmtu; | |
4631 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4632 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4633 | ||
4634 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4635 | params.spp_flags = trans->param_flags; | |
4636 | } else if (asoc) { | |
4637 | /* Fetch association values. */ | |
4638 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4639 | params.spp_pathmtu = asoc->pathmtu; | |
4640 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4641 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4642 | ||
4643 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4644 | params.spp_flags = asoc->param_flags; | |
4645 | } else { | |
4646 | /* Fetch socket values. */ | |
4647 | params.spp_hbinterval = sp->hbinterval; | |
4648 | params.spp_pathmtu = sp->pathmtu; | |
4649 | params.spp_sackdelay = sp->sackdelay; | |
4650 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4651 | |
52ccb8e9 FF |
4652 | /*draft-11 doesn't say what to return in spp_flags*/ |
4653 | params.spp_flags = sp->param_flags; | |
4654 | } | |
1da177e4 | 4655 | |
1da177e4 LT |
4656 | if (copy_to_user(optval, ¶ms, len)) |
4657 | return -EFAULT; | |
4658 | ||
4659 | if (put_user(len, optlen)) | |
4660 | return -EFAULT; | |
4661 | ||
4662 | return 0; | |
4663 | } | |
4664 | ||
d364d927 WY |
4665 | /* |
4666 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4667 | * | |
4668 | * This option will effect the way delayed acks are performed. This | |
4669 | * option allows you to get or set the delayed ack time, in | |
4670 | * milliseconds. It also allows changing the delayed ack frequency. | |
4671 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4672 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4673 | * values. If the assoc_id field is non-zero, then the set or get | |
4674 | * effects the specified association for the one to many model (the | |
4675 | * assoc_id field is ignored by the one to one model). Note that if | |
4676 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4677 | * current values will remain unchanged. | |
4678 | * | |
4679 | * struct sctp_sack_info { | |
4680 | * sctp_assoc_t sack_assoc_id; | |
4681 | * uint32_t sack_delay; | |
4682 | * uint32_t sack_freq; | |
4683 | * }; | |
7708610b | 4684 | * |
d364d927 WY |
4685 | * sack_assoc_id - This parameter, indicates which association the user |
4686 | * is performing an action upon. Note that if this field's value is | |
4687 | * zero then the endpoints default value is changed (effecting future | |
4688 | * associations only). | |
7708610b | 4689 | * |
d364d927 WY |
4690 | * sack_delay - This parameter contains the number of milliseconds that |
4691 | * the user is requesting the delayed ACK timer be set to. Note that | |
4692 | * this value is defined in the standard to be between 200 and 500 | |
4693 | * milliseconds. | |
7708610b | 4694 | * |
d364d927 WY |
4695 | * sack_freq - This parameter contains the number of packets that must |
4696 | * be received before a sack is sent without waiting for the delay | |
4697 | * timer to expire. The default value for this is 2, setting this | |
4698 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4699 | */ |
d364d927 | 4700 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4701 | char __user *optval, |
4702 | int __user *optlen) | |
4703 | { | |
d364d927 | 4704 | struct sctp_sack_info params; |
7708610b FF |
4705 | struct sctp_association *asoc = NULL; |
4706 | struct sctp_sock *sp = sctp_sk(sk); | |
4707 | ||
d364d927 WY |
4708 | if (len >= sizeof(struct sctp_sack_info)) { |
4709 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4710 | |
d364d927 WY |
4711 | if (copy_from_user(¶ms, optval, len)) |
4712 | return -EFAULT; | |
4713 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
94f65193 | 4714 | pr_warn_ratelimited(DEPRECATED |
f916ec96 | 4715 | "%s (pid %d) " |
94f65193 | 4716 | "Use of struct sctp_assoc_value in delayed_ack socket option.\n" |
f916ec96 NH |
4717 | "Use struct sctp_sack_info instead\n", |
4718 | current->comm, task_pid_nr(current)); | |
d364d927 WY |
4719 | if (copy_from_user(¶ms, optval, len)) |
4720 | return -EFAULT; | |
4721 | } else | |
cb3f837b | 4722 | return -EINVAL; |
7708610b | 4723 | |
d364d927 | 4724 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4725 | * to many style socket, and an association was not found, then |
4726 | * the id was invalid. | |
d808ad9a | 4727 | */ |
d364d927 WY |
4728 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4729 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4730 | return -EINVAL; |
4731 | ||
4732 | if (asoc) { | |
4733 | /* Fetch association values. */ | |
d364d927 WY |
4734 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4735 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4736 | asoc->sackdelay); |
d364d927 WY |
4737 | params.sack_freq = asoc->sackfreq; |
4738 | ||
4739 | } else { | |
4740 | params.sack_delay = 0; | |
4741 | params.sack_freq = 1; | |
4742 | } | |
7708610b FF |
4743 | } else { |
4744 | /* Fetch socket values. */ | |
d364d927 WY |
4745 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4746 | params.sack_delay = sp->sackdelay; | |
4747 | params.sack_freq = sp->sackfreq; | |
4748 | } else { | |
4749 | params.sack_delay = 0; | |
4750 | params.sack_freq = 1; | |
4751 | } | |
7708610b FF |
4752 | } |
4753 | ||
4754 | if (copy_to_user(optval, ¶ms, len)) | |
4755 | return -EFAULT; | |
4756 | ||
4757 | if (put_user(len, optlen)) | |
4758 | return -EFAULT; | |
4759 | ||
4760 | return 0; | |
4761 | } | |
4762 | ||
1da177e4 LT |
4763 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4764 | * | |
4765 | * Applications can specify protocol parameters for the default association | |
4766 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4767 | * is SCTP_INITMSG. | |
4768 | * | |
4769 | * Setting initialization parameters is effective only on an unconnected | |
4770 | * socket (for UDP-style sockets only future associations are effected | |
4771 | * by the change). With TCP-style sockets, this option is inherited by | |
4772 | * sockets derived from a listener socket. | |
4773 | */ | |
4774 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4775 | { | |
408f22e8 | 4776 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4777 | return -EINVAL; |
408f22e8 NH |
4778 | len = sizeof(struct sctp_initmsg); |
4779 | if (put_user(len, optlen)) | |
4780 | return -EFAULT; | |
1da177e4 LT |
4781 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4782 | return -EFAULT; | |
4783 | return 0; | |
4784 | } | |
4785 |