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60c778b2 | 1 | /* SCTP kernel implementation |
1da177e4 LT |
2 | * (C) Copyright IBM Corp. 2001, 2004 |
3 | * Copyright (c) 1999-2000 Cisco, Inc. | |
4 | * Copyright (c) 1999-2001 Motorola, Inc. | |
5 | * Copyright (c) 2001-2003 Intel Corp. | |
6 | * Copyright (c) 2001-2002 Nokia, Inc. | |
7 | * Copyright (c) 2001 La Monte H.P. Yarroll | |
8 | * | |
60c778b2 | 9 | * This file is part of the SCTP kernel implementation |
1da177e4 LT |
10 | * |
11 | * These functions interface with the sockets layer to implement the | |
12 | * SCTP Extensions for the Sockets API. | |
13 | * | |
14 | * Note that the descriptions from the specification are USER level | |
15 | * functions--this file is the functions which populate the struct proto | |
16 | * for SCTP which is the BOTTOM of the sockets interface. | |
17 | * | |
60c778b2 | 18 | * This SCTP implementation is free software; |
1da177e4 LT |
19 | * you can redistribute it and/or modify it under the terms of |
20 | * the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2, or (at your option) | |
22 | * any later version. | |
23 | * | |
60c778b2 | 24 | * This SCTP implementation is distributed in the hope that it |
1da177e4 LT |
25 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
26 | * ************************ | |
27 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
28 | * See the GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with GNU CC; see the file COPYING. If not, write to | |
32 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
33 | * Boston, MA 02111-1307, USA. | |
34 | * | |
35 | * Please send any bug reports or fixes you make to the | |
36 | * email address(es): | |
37 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
38 | * | |
39 | * Or submit a bug report through the following website: | |
40 | * http://www.sf.net/projects/lksctp | |
41 | * | |
42 | * Written or modified by: | |
43 | * La Monte H.P. Yarroll <piggy@acm.org> | |
44 | * Narasimha Budihal <narsi@refcode.org> | |
45 | * Karl Knutson <karl@athena.chicago.il.us> | |
46 | * Jon Grimm <jgrimm@us.ibm.com> | |
47 | * Xingang Guo <xingang.guo@intel.com> | |
48 | * Daisy Chang <daisyc@us.ibm.com> | |
49 | * Sridhar Samudrala <samudrala@us.ibm.com> | |
50 | * Inaky Perez-Gonzalez <inaky.gonzalez@intel.com> | |
51 | * Ardelle Fan <ardelle.fan@intel.com> | |
52 | * Ryan Layer <rmlayer@us.ibm.com> | |
53 | * Anup Pemmaiah <pemmaiah@cc.usu.edu> | |
54 | * Kevin Gao <kevin.gao@intel.com> | |
55 | * | |
56 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
57 | * be incorporated into the next SCTP release. | |
58 | */ | |
59 | ||
145ce502 JP |
60 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
61 | ||
1da177e4 LT |
62 | #include <linux/types.h> |
63 | #include <linux/kernel.h> | |
64 | #include <linux/wait.h> | |
65 | #include <linux/time.h> | |
66 | #include <linux/ip.h> | |
4fc268d2 | 67 | #include <linux/capability.h> |
1da177e4 LT |
68 | #include <linux/fcntl.h> |
69 | #include <linux/poll.h> | |
70 | #include <linux/init.h> | |
71 | #include <linux/crypto.h> | |
5a0e3ad6 | 72 | #include <linux/slab.h> |
56b31d1c | 73 | #include <linux/file.h> |
1da177e4 LT |
74 | |
75 | #include <net/ip.h> | |
76 | #include <net/icmp.h> | |
77 | #include <net/route.h> | |
78 | #include <net/ipv6.h> | |
79 | #include <net/inet_common.h> | |
80 | ||
81 | #include <linux/socket.h> /* for sa_family_t */ | |
bc3b2d7f | 82 | #include <linux/export.h> |
1da177e4 LT |
83 | #include <net/sock.h> |
84 | #include <net/sctp/sctp.h> | |
85 | #include <net/sctp/sm.h> | |
86 | ||
1da177e4 LT |
87 | /* Forward declarations for internal helper functions. */ |
88 | static int sctp_writeable(struct sock *sk); | |
89 | static void sctp_wfree(struct sk_buff *skb); | |
90 | static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p, | |
91 | size_t msg_len); | |
92 | static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p); | |
93 | static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p); | |
94 | static int sctp_wait_for_accept(struct sock *sk, long timeo); | |
95 | static void sctp_wait_for_close(struct sock *sk, long timeo); | |
0a2fbac1 | 96 | static void sctp_destruct_sock(struct sock *sk); |
1da177e4 LT |
97 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, |
98 | union sctp_addr *addr, int len); | |
99 | static int sctp_bindx_add(struct sock *, struct sockaddr *, int); | |
100 | static int sctp_bindx_rem(struct sock *, struct sockaddr *, int); | |
101 | static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int); | |
102 | static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int); | |
103 | static int sctp_send_asconf(struct sctp_association *asoc, | |
104 | struct sctp_chunk *chunk); | |
105 | static int sctp_do_bind(struct sock *, union sctp_addr *, int); | |
106 | static int sctp_autobind(struct sock *sk); | |
107 | static void sctp_sock_migrate(struct sock *, struct sock *, | |
108 | struct sctp_association *, sctp_socket_type_t); | |
1da177e4 | 109 | |
4d93df0a | 110 | extern struct kmem_cache *sctp_bucket_cachep; |
8d987e5c | 111 | extern long sysctl_sctp_mem[3]; |
4d93df0a NH |
112 | extern int sysctl_sctp_rmem[3]; |
113 | extern int sysctl_sctp_wmem[3]; | |
114 | ||
b6fa1a4d | 115 | static int sctp_memory_pressure; |
8d987e5c | 116 | static atomic_long_t sctp_memory_allocated; |
1748376b | 117 | struct percpu_counter sctp_sockets_allocated; |
4d93df0a | 118 | |
5c52ba17 | 119 | static void sctp_enter_memory_pressure(struct sock *sk) |
4d93df0a NH |
120 | { |
121 | sctp_memory_pressure = 1; | |
122 | } | |
123 | ||
124 | ||
1da177e4 LT |
125 | /* Get the sndbuf space available at the time on the association. */ |
126 | static inline int sctp_wspace(struct sctp_association *asoc) | |
127 | { | |
4d93df0a | 128 | int amt; |
1da177e4 | 129 | |
4d93df0a NH |
130 | if (asoc->ep->sndbuf_policy) |
131 | amt = asoc->sndbuf_used; | |
132 | else | |
31e6d363 | 133 | amt = sk_wmem_alloc_get(asoc->base.sk); |
4d93df0a NH |
134 | |
135 | if (amt >= asoc->base.sk->sk_sndbuf) { | |
136 | if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK) | |
137 | amt = 0; | |
138 | else { | |
139 | amt = sk_stream_wspace(asoc->base.sk); | |
140 | if (amt < 0) | |
141 | amt = 0; | |
142 | } | |
4eb701df | 143 | } else { |
4d93df0a | 144 | amt = asoc->base.sk->sk_sndbuf - amt; |
4eb701df | 145 | } |
1da177e4 LT |
146 | return amt; |
147 | } | |
148 | ||
149 | /* Increment the used sndbuf space count of the corresponding association by | |
150 | * the size of the outgoing data chunk. | |
151 | * Also, set the skb destructor for sndbuf accounting later. | |
152 | * | |
153 | * Since it is always 1-1 between chunk and skb, and also a new skb is always | |
154 | * allocated for chunk bundling in sctp_packet_transmit(), we can use the | |
155 | * destructor in the data chunk skb for the purpose of the sndbuf space | |
156 | * tracking. | |
157 | */ | |
158 | static inline void sctp_set_owner_w(struct sctp_chunk *chunk) | |
159 | { | |
160 | struct sctp_association *asoc = chunk->asoc; | |
161 | struct sock *sk = asoc->base.sk; | |
162 | ||
163 | /* The sndbuf space is tracked per association. */ | |
164 | sctp_association_hold(asoc); | |
165 | ||
4eb701df NH |
166 | skb_set_owner_w(chunk->skb, sk); |
167 | ||
1da177e4 LT |
168 | chunk->skb->destructor = sctp_wfree; |
169 | /* Save the chunk pointer in skb for sctp_wfree to use later. */ | |
170 | *((struct sctp_chunk **)(chunk->skb->cb)) = chunk; | |
171 | ||
4eb701df NH |
172 | asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + |
173 | sizeof(struct sk_buff) + | |
174 | sizeof(struct sctp_chunk); | |
175 | ||
4eb701df | 176 | atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); |
3ab224be HA |
177 | sk->sk_wmem_queued += chunk->skb->truesize; |
178 | sk_mem_charge(sk, chunk->skb->truesize); | |
1da177e4 LT |
179 | } |
180 | ||
181 | /* Verify that this is a valid address. */ | |
182 | static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, | |
183 | int len) | |
184 | { | |
185 | struct sctp_af *af; | |
186 | ||
187 | /* Verify basic sockaddr. */ | |
188 | af = sctp_sockaddr_af(sctp_sk(sk), addr, len); | |
189 | if (!af) | |
190 | return -EINVAL; | |
191 | ||
192 | /* Is this a valid SCTP address? */ | |
5636bef7 | 193 | if (!af->addr_valid(addr, sctp_sk(sk), NULL)) |
1da177e4 LT |
194 | return -EINVAL; |
195 | ||
196 | if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) | |
197 | return -EINVAL; | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* Look up the association by its id. If this is not a UDP-style | |
203 | * socket, the ID field is always ignored. | |
204 | */ | |
205 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id) | |
206 | { | |
207 | struct sctp_association *asoc = NULL; | |
208 | ||
209 | /* If this is not a UDP-style socket, assoc id should be ignored. */ | |
210 | if (!sctp_style(sk, UDP)) { | |
211 | /* Return NULL if the socket state is not ESTABLISHED. It | |
212 | * could be a TCP-style listening socket or a socket which | |
213 | * hasn't yet called connect() to establish an association. | |
214 | */ | |
215 | if (!sctp_sstate(sk, ESTABLISHED)) | |
216 | return NULL; | |
217 | ||
218 | /* Get the first and the only association from the list. */ | |
219 | if (!list_empty(&sctp_sk(sk)->ep->asocs)) | |
220 | asoc = list_entry(sctp_sk(sk)->ep->asocs.next, | |
221 | struct sctp_association, asocs); | |
222 | return asoc; | |
223 | } | |
224 | ||
225 | /* Otherwise this is a UDP-style socket. */ | |
226 | if (!id || (id == (sctp_assoc_t)-1)) | |
227 | return NULL; | |
228 | ||
229 | spin_lock_bh(&sctp_assocs_id_lock); | |
230 | asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id); | |
231 | spin_unlock_bh(&sctp_assocs_id_lock); | |
232 | ||
233 | if (!asoc || (asoc->base.sk != sk) || asoc->base.dead) | |
234 | return NULL; | |
235 | ||
236 | return asoc; | |
237 | } | |
238 | ||
239 | /* Look up the transport from an address and an assoc id. If both address and | |
240 | * id are specified, the associations matching the address and the id should be | |
241 | * the same. | |
242 | */ | |
243 | static struct sctp_transport *sctp_addr_id2transport(struct sock *sk, | |
244 | struct sockaddr_storage *addr, | |
245 | sctp_assoc_t id) | |
246 | { | |
247 | struct sctp_association *addr_asoc = NULL, *id_asoc = NULL; | |
248 | struct sctp_transport *transport; | |
249 | union sctp_addr *laddr = (union sctp_addr *)addr; | |
250 | ||
1da177e4 | 251 | addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep, |
cd4ff034 | 252 | laddr, |
1da177e4 | 253 | &transport); |
1da177e4 LT |
254 | |
255 | if (!addr_asoc) | |
256 | return NULL; | |
257 | ||
258 | id_asoc = sctp_id2assoc(sk, id); | |
259 | if (id_asoc && (id_asoc != addr_asoc)) | |
260 | return NULL; | |
261 | ||
262 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
263 | (union sctp_addr *)addr); | |
264 | ||
265 | return transport; | |
266 | } | |
267 | ||
268 | /* API 3.1.2 bind() - UDP Style Syntax | |
269 | * The syntax of bind() is, | |
270 | * | |
271 | * ret = bind(int sd, struct sockaddr *addr, int addrlen); | |
272 | * | |
273 | * sd - the socket descriptor returned by socket(). | |
274 | * addr - the address structure (struct sockaddr_in or struct | |
275 | * sockaddr_in6 [RFC 2553]), | |
276 | * addr_len - the size of the address structure. | |
277 | */ | |
dda91928 | 278 | static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len) |
1da177e4 LT |
279 | { |
280 | int retval = 0; | |
281 | ||
282 | sctp_lock_sock(sk); | |
283 | ||
3f7a87d2 FF |
284 | SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n", |
285 | sk, addr, addr_len); | |
1da177e4 LT |
286 | |
287 | /* Disallow binding twice. */ | |
288 | if (!sctp_sk(sk)->ep->base.bind_addr.port) | |
3f7a87d2 | 289 | retval = sctp_do_bind(sk, (union sctp_addr *)addr, |
1da177e4 LT |
290 | addr_len); |
291 | else | |
292 | retval = -EINVAL; | |
293 | ||
294 | sctp_release_sock(sk); | |
295 | ||
296 | return retval; | |
297 | } | |
298 | ||
299 | static long sctp_get_port_local(struct sock *, union sctp_addr *); | |
300 | ||
301 | /* Verify this is a valid sockaddr. */ | |
302 | static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt, | |
303 | union sctp_addr *addr, int len) | |
304 | { | |
305 | struct sctp_af *af; | |
306 | ||
307 | /* Check minimum size. */ | |
308 | if (len < sizeof (struct sockaddr)) | |
309 | return NULL; | |
310 | ||
7dab83de VY |
311 | /* V4 mapped address are really of AF_INET family */ |
312 | if (addr->sa.sa_family == AF_INET6 && | |
313 | ipv6_addr_v4mapped(&addr->v6.sin6_addr)) { | |
314 | if (!opt->pf->af_supported(AF_INET, opt)) | |
315 | return NULL; | |
316 | } else { | |
317 | /* Does this PF support this AF? */ | |
318 | if (!opt->pf->af_supported(addr->sa.sa_family, opt)) | |
319 | return NULL; | |
320 | } | |
1da177e4 LT |
321 | |
322 | /* If we get this far, af is valid. */ | |
323 | af = sctp_get_af_specific(addr->sa.sa_family); | |
324 | ||
325 | if (len < af->sockaddr_len) | |
326 | return NULL; | |
327 | ||
328 | return af; | |
329 | } | |
330 | ||
331 | /* Bind a local address either to an endpoint or to an association. */ | |
dda91928 | 332 | static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) |
1da177e4 | 333 | { |
3594698a | 334 | struct net *net = sock_net(sk); |
1da177e4 LT |
335 | struct sctp_sock *sp = sctp_sk(sk); |
336 | struct sctp_endpoint *ep = sp->ep; | |
337 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
338 | struct sctp_af *af; | |
339 | unsigned short snum; | |
340 | int ret = 0; | |
341 | ||
1da177e4 LT |
342 | /* Common sockaddr verification. */ |
343 | af = sctp_sockaddr_af(sp, addr, len); | |
3f7a87d2 FF |
344 | if (!af) { |
345 | SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n", | |
346 | sk, addr, len); | |
1da177e4 | 347 | return -EINVAL; |
3f7a87d2 FF |
348 | } |
349 | ||
350 | snum = ntohs(addr->v4.sin_port); | |
351 | ||
352 | SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ", | |
353 | ", port: %d, new port: %d, len: %d)\n", | |
354 | sk, | |
355 | addr, | |
356 | bp->port, snum, | |
357 | len); | |
1da177e4 LT |
358 | |
359 | /* PF specific bind() address verification. */ | |
360 | if (!sp->pf->bind_verify(sp, addr)) | |
361 | return -EADDRNOTAVAIL; | |
362 | ||
8b358056 VY |
363 | /* We must either be unbound, or bind to the same port. |
364 | * It's OK to allow 0 ports if we are already bound. | |
365 | * We'll just inhert an already bound port in this case | |
366 | */ | |
367 | if (bp->port) { | |
368 | if (!snum) | |
369 | snum = bp->port; | |
370 | else if (snum != bp->port) { | |
371 | SCTP_DEBUG_PRINTK("sctp_do_bind:" | |
1da177e4 LT |
372 | " New port %d does not match existing port " |
373 | "%d.\n", snum, bp->port); | |
8b358056 VY |
374 | return -EINVAL; |
375 | } | |
1da177e4 LT |
376 | } |
377 | ||
3594698a EB |
378 | if (snum && snum < PROT_SOCK && |
379 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) | |
1da177e4 LT |
380 | return -EACCES; |
381 | ||
4e54064e VY |
382 | /* See if the address matches any of the addresses we may have |
383 | * already bound before checking against other endpoints. | |
384 | */ | |
385 | if (sctp_bind_addr_match(bp, addr, sp)) | |
386 | return -EINVAL; | |
387 | ||
1da177e4 LT |
388 | /* Make sure we are allowed to bind here. |
389 | * The function sctp_get_port_local() does duplicate address | |
390 | * detection. | |
391 | */ | |
2772b495 | 392 | addr->v4.sin_port = htons(snum); |
1da177e4 | 393 | if ((ret = sctp_get_port_local(sk, addr))) { |
4e54064e | 394 | return -EADDRINUSE; |
1da177e4 LT |
395 | } |
396 | ||
397 | /* Refresh ephemeral port. */ | |
398 | if (!bp->port) | |
c720c7e8 | 399 | bp->port = inet_sk(sk)->inet_num; |
1da177e4 | 400 | |
559cf710 VY |
401 | /* Add the address to the bind address list. |
402 | * Use GFP_ATOMIC since BHs will be disabled. | |
403 | */ | |
f57d96b2 | 404 | ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC); |
1da177e4 LT |
405 | |
406 | /* Copy back into socket for getsockname() use. */ | |
407 | if (!ret) { | |
c720c7e8 | 408 | inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num); |
1da177e4 LT |
409 | af->to_sk_saddr(addr, sk); |
410 | } | |
411 | ||
412 | return ret; | |
413 | } | |
414 | ||
415 | /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks | |
416 | * | |
d808ad9a | 417 | * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged |
1da177e4 | 418 | * at any one time. If a sender, after sending an ASCONF chunk, decides |
d808ad9a | 419 | * it needs to transfer another ASCONF Chunk, it MUST wait until the |
1da177e4 | 420 | * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a |
d808ad9a YH |
421 | * subsequent ASCONF. Note this restriction binds each side, so at any |
422 | * time two ASCONF may be in-transit on any given association (one sent | |
1da177e4 LT |
423 | * from each endpoint). |
424 | */ | |
425 | static int sctp_send_asconf(struct sctp_association *asoc, | |
426 | struct sctp_chunk *chunk) | |
427 | { | |
55e26eb9 | 428 | struct net *net = sock_net(asoc->base.sk); |
1da177e4 LT |
429 | int retval = 0; |
430 | ||
431 | /* If there is an outstanding ASCONF chunk, queue it for later | |
432 | * transmission. | |
d808ad9a | 433 | */ |
1da177e4 | 434 | if (asoc->addip_last_asconf) { |
79af02c2 | 435 | list_add_tail(&chunk->list, &asoc->addip_chunk_list); |
d808ad9a | 436 | goto out; |
1da177e4 LT |
437 | } |
438 | ||
439 | /* Hold the chunk until an ASCONF_ACK is received. */ | |
440 | sctp_chunk_hold(chunk); | |
55e26eb9 | 441 | retval = sctp_primitive_ASCONF(net, asoc, chunk); |
1da177e4 LT |
442 | if (retval) |
443 | sctp_chunk_free(chunk); | |
444 | else | |
445 | asoc->addip_last_asconf = chunk; | |
446 | ||
447 | out: | |
448 | return retval; | |
449 | } | |
450 | ||
451 | /* Add a list of addresses as bind addresses to local endpoint or | |
452 | * association. | |
453 | * | |
454 | * Basically run through each address specified in the addrs/addrcnt | |
455 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
456 | * sctp_do_bind() on it. | |
457 | * | |
458 | * If any of them fails, then the operation will be reversed and the | |
459 | * ones that were added will be removed. | |
460 | * | |
461 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
462 | */ | |
04675210 | 463 | static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
464 | { |
465 | int cnt; | |
466 | int retval = 0; | |
467 | void *addr_buf; | |
468 | struct sockaddr *sa_addr; | |
469 | struct sctp_af *af; | |
470 | ||
471 | SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n", | |
472 | sk, addrs, addrcnt); | |
473 | ||
474 | addr_buf = addrs; | |
475 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
476 | /* The list may contain either IPv4 or IPv6 address; | |
477 | * determine the address length for walking thru the list. | |
478 | */ | |
ea110733 | 479 | sa_addr = addr_buf; |
1da177e4 LT |
480 | af = sctp_get_af_specific(sa_addr->sa_family); |
481 | if (!af) { | |
482 | retval = -EINVAL; | |
483 | goto err_bindx_add; | |
484 | } | |
485 | ||
d808ad9a | 486 | retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr, |
1da177e4 LT |
487 | af->sockaddr_len); |
488 | ||
489 | addr_buf += af->sockaddr_len; | |
490 | ||
491 | err_bindx_add: | |
492 | if (retval < 0) { | |
493 | /* Failed. Cleanup the ones that have been added */ | |
494 | if (cnt > 0) | |
495 | sctp_bindx_rem(sk, addrs, cnt); | |
496 | return retval; | |
497 | } | |
498 | } | |
499 | ||
500 | return retval; | |
501 | } | |
502 | ||
503 | /* Send an ASCONF chunk with Add IP address parameters to all the peers of the | |
504 | * associations that are part of the endpoint indicating that a list of local | |
505 | * addresses are added to the endpoint. | |
506 | * | |
d808ad9a | 507 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
508 | * association, we do not send the chunk for that association. But it will not |
509 | * affect other associations. | |
510 | * | |
511 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
512 | */ | |
d808ad9a | 513 | static int sctp_send_asconf_add_ip(struct sock *sk, |
1da177e4 LT |
514 | struct sockaddr *addrs, |
515 | int addrcnt) | |
516 | { | |
e1fc3b14 | 517 | struct net *net = sock_net(sk); |
1da177e4 LT |
518 | struct sctp_sock *sp; |
519 | struct sctp_endpoint *ep; | |
520 | struct sctp_association *asoc; | |
521 | struct sctp_bind_addr *bp; | |
522 | struct sctp_chunk *chunk; | |
523 | struct sctp_sockaddr_entry *laddr; | |
524 | union sctp_addr *addr; | |
dc022a98 | 525 | union sctp_addr saveaddr; |
1da177e4 LT |
526 | void *addr_buf; |
527 | struct sctp_af *af; | |
1da177e4 LT |
528 | struct list_head *p; |
529 | int i; | |
530 | int retval = 0; | |
531 | ||
e1fc3b14 | 532 | if (!net->sctp.addip_enable) |
1da177e4 LT |
533 | return retval; |
534 | ||
535 | sp = sctp_sk(sk); | |
536 | ep = sp->ep; | |
537 | ||
538 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
0dc47877 | 539 | __func__, sk, addrs, addrcnt); |
1da177e4 | 540 | |
9dbc15f0 | 541 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
542 | |
543 | if (!asoc->peer.asconf_capable) | |
544 | continue; | |
545 | ||
546 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP) | |
547 | continue; | |
548 | ||
549 | if (!sctp_state(asoc, ESTABLISHED)) | |
550 | continue; | |
551 | ||
552 | /* Check if any address in the packed array of addresses is | |
d808ad9a YH |
553 | * in the bind address list of the association. If so, |
554 | * do not send the asconf chunk to its peer, but continue with | |
1da177e4 LT |
555 | * other associations. |
556 | */ | |
557 | addr_buf = addrs; | |
558 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 559 | addr = addr_buf; |
1da177e4 LT |
560 | af = sctp_get_af_specific(addr->v4.sin_family); |
561 | if (!af) { | |
562 | retval = -EINVAL; | |
563 | goto out; | |
564 | } | |
565 | ||
566 | if (sctp_assoc_lookup_laddr(asoc, addr)) | |
567 | break; | |
568 | ||
569 | addr_buf += af->sockaddr_len; | |
570 | } | |
571 | if (i < addrcnt) | |
572 | continue; | |
573 | ||
559cf710 VY |
574 | /* Use the first valid address in bind addr list of |
575 | * association as Address Parameter of ASCONF CHUNK. | |
1da177e4 | 576 | */ |
1da177e4 LT |
577 | bp = &asoc->base.bind_addr; |
578 | p = bp->address_list.next; | |
579 | laddr = list_entry(p, struct sctp_sockaddr_entry, list); | |
5ae955cf | 580 | chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs, |
1da177e4 LT |
581 | addrcnt, SCTP_PARAM_ADD_IP); |
582 | if (!chunk) { | |
583 | retval = -ENOMEM; | |
584 | goto out; | |
585 | } | |
586 | ||
dc022a98 SS |
587 | /* Add the new addresses to the bind address list with |
588 | * use_as_src set to 0. | |
1da177e4 | 589 | */ |
dc022a98 SS |
590 | addr_buf = addrs; |
591 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 592 | addr = addr_buf; |
dc022a98 SS |
593 | af = sctp_get_af_specific(addr->v4.sin_family); |
594 | memcpy(&saveaddr, addr, af->sockaddr_len); | |
f57d96b2 VY |
595 | retval = sctp_add_bind_addr(bp, &saveaddr, |
596 | SCTP_ADDR_NEW, GFP_ATOMIC); | |
dc022a98 SS |
597 | addr_buf += af->sockaddr_len; |
598 | } | |
8a07eb0a MH |
599 | if (asoc->src_out_of_asoc_ok) { |
600 | struct sctp_transport *trans; | |
601 | ||
602 | list_for_each_entry(trans, | |
603 | &asoc->peer.transport_addr_list, transports) { | |
604 | /* Clear the source and route cache */ | |
605 | dst_release(trans->dst); | |
606 | trans->cwnd = min(4*asoc->pathmtu, max_t(__u32, | |
607 | 2*asoc->pathmtu, 4380)); | |
608 | trans->ssthresh = asoc->peer.i.a_rwnd; | |
609 | trans->rto = asoc->rto_initial; | |
196d6759 | 610 | sctp_max_rto(asoc, trans); |
8a07eb0a MH |
611 | trans->rtt = trans->srtt = trans->rttvar = 0; |
612 | sctp_transport_route(trans, NULL, | |
613 | sctp_sk(asoc->base.sk)); | |
614 | } | |
615 | } | |
616 | retval = sctp_send_asconf(asoc, chunk); | |
1da177e4 LT |
617 | } |
618 | ||
619 | out: | |
620 | return retval; | |
621 | } | |
622 | ||
623 | /* Remove a list of addresses from bind addresses list. Do not remove the | |
624 | * last address. | |
625 | * | |
626 | * Basically run through each address specified in the addrs/addrcnt | |
627 | * array/length pair, determine if it is IPv6 or IPv4 and call | |
628 | * sctp_del_bind() on it. | |
629 | * | |
630 | * If any of them fails, then the operation will be reversed and the | |
631 | * ones that were removed will be added back. | |
632 | * | |
633 | * At least one address has to be left; if only one address is | |
634 | * available, the operation will return -EBUSY. | |
635 | * | |
636 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
637 | */ | |
04675210 | 638 | static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt) |
1da177e4 LT |
639 | { |
640 | struct sctp_sock *sp = sctp_sk(sk); | |
641 | struct sctp_endpoint *ep = sp->ep; | |
642 | int cnt; | |
643 | struct sctp_bind_addr *bp = &ep->base.bind_addr; | |
644 | int retval = 0; | |
1da177e4 | 645 | void *addr_buf; |
c9a08505 | 646 | union sctp_addr *sa_addr; |
1da177e4 LT |
647 | struct sctp_af *af; |
648 | ||
649 | SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n", | |
650 | sk, addrs, addrcnt); | |
651 | ||
652 | addr_buf = addrs; | |
653 | for (cnt = 0; cnt < addrcnt; cnt++) { | |
654 | /* If the bind address list is empty or if there is only one | |
655 | * bind address, there is nothing more to be removed (we need | |
656 | * at least one address here). | |
657 | */ | |
658 | if (list_empty(&bp->address_list) || | |
659 | (sctp_list_single_entry(&bp->address_list))) { | |
660 | retval = -EBUSY; | |
661 | goto err_bindx_rem; | |
662 | } | |
663 | ||
ea110733 | 664 | sa_addr = addr_buf; |
c9a08505 | 665 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1da177e4 LT |
666 | if (!af) { |
667 | retval = -EINVAL; | |
668 | goto err_bindx_rem; | |
669 | } | |
0304ff8a PG |
670 | |
671 | if (!af->addr_valid(sa_addr, sp, NULL)) { | |
672 | retval = -EADDRNOTAVAIL; | |
673 | goto err_bindx_rem; | |
674 | } | |
675 | ||
ee9cbaca VY |
676 | if (sa_addr->v4.sin_port && |
677 | sa_addr->v4.sin_port != htons(bp->port)) { | |
1da177e4 LT |
678 | retval = -EINVAL; |
679 | goto err_bindx_rem; | |
680 | } | |
681 | ||
ee9cbaca VY |
682 | if (!sa_addr->v4.sin_port) |
683 | sa_addr->v4.sin_port = htons(bp->port); | |
684 | ||
1da177e4 LT |
685 | /* FIXME - There is probably a need to check if sk->sk_saddr and |
686 | * sk->sk_rcv_addr are currently set to one of the addresses to | |
687 | * be removed. This is something which needs to be looked into | |
688 | * when we are fixing the outstanding issues with multi-homing | |
689 | * socket routing and failover schemes. Refer to comments in | |
690 | * sctp_do_bind(). -daisy | |
691 | */ | |
0ed90fb0 | 692 | retval = sctp_del_bind_addr(bp, sa_addr); |
1da177e4 LT |
693 | |
694 | addr_buf += af->sockaddr_len; | |
695 | err_bindx_rem: | |
696 | if (retval < 0) { | |
697 | /* Failed. Add the ones that has been removed back */ | |
698 | if (cnt > 0) | |
699 | sctp_bindx_add(sk, addrs, cnt); | |
700 | return retval; | |
701 | } | |
702 | } | |
703 | ||
704 | return retval; | |
705 | } | |
706 | ||
707 | /* Send an ASCONF chunk with Delete IP address parameters to all the peers of | |
708 | * the associations that are part of the endpoint indicating that a list of | |
709 | * local addresses are removed from the endpoint. | |
710 | * | |
d808ad9a | 711 | * If any of the addresses is already in the bind address list of the |
1da177e4 LT |
712 | * association, we do not send the chunk for that association. But it will not |
713 | * affect other associations. | |
714 | * | |
715 | * Only sctp_setsockopt_bindx() is supposed to call this function. | |
716 | */ | |
717 | static int sctp_send_asconf_del_ip(struct sock *sk, | |
718 | struct sockaddr *addrs, | |
719 | int addrcnt) | |
720 | { | |
e1fc3b14 | 721 | struct net *net = sock_net(sk); |
1da177e4 LT |
722 | struct sctp_sock *sp; |
723 | struct sctp_endpoint *ep; | |
724 | struct sctp_association *asoc; | |
dc022a98 | 725 | struct sctp_transport *transport; |
1da177e4 LT |
726 | struct sctp_bind_addr *bp; |
727 | struct sctp_chunk *chunk; | |
728 | union sctp_addr *laddr; | |
729 | void *addr_buf; | |
730 | struct sctp_af *af; | |
dc022a98 | 731 | struct sctp_sockaddr_entry *saddr; |
1da177e4 LT |
732 | int i; |
733 | int retval = 0; | |
8a07eb0a | 734 | int stored = 0; |
1da177e4 | 735 | |
8a07eb0a | 736 | chunk = NULL; |
e1fc3b14 | 737 | if (!net->sctp.addip_enable) |
1da177e4 LT |
738 | return retval; |
739 | ||
740 | sp = sctp_sk(sk); | |
741 | ep = sp->ep; | |
742 | ||
743 | SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n", | |
0dc47877 | 744 | __func__, sk, addrs, addrcnt); |
1da177e4 | 745 | |
9dbc15f0 | 746 | list_for_each_entry(asoc, &ep->asocs, asocs) { |
1da177e4 LT |
747 | |
748 | if (!asoc->peer.asconf_capable) | |
749 | continue; | |
750 | ||
751 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP) | |
752 | continue; | |
753 | ||
754 | if (!sctp_state(asoc, ESTABLISHED)) | |
755 | continue; | |
756 | ||
757 | /* Check if any address in the packed array of addresses is | |
d808ad9a | 758 | * not present in the bind address list of the association. |
1da177e4 LT |
759 | * If so, do not send the asconf chunk to its peer, but |
760 | * continue with other associations. | |
761 | */ | |
762 | addr_buf = addrs; | |
763 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 764 | laddr = addr_buf; |
1da177e4 LT |
765 | af = sctp_get_af_specific(laddr->v4.sin_family); |
766 | if (!af) { | |
767 | retval = -EINVAL; | |
768 | goto out; | |
769 | } | |
770 | ||
771 | if (!sctp_assoc_lookup_laddr(asoc, laddr)) | |
772 | break; | |
773 | ||
774 | addr_buf += af->sockaddr_len; | |
775 | } | |
776 | if (i < addrcnt) | |
777 | continue; | |
778 | ||
779 | /* Find one address in the association's bind address list | |
780 | * that is not in the packed array of addresses. This is to | |
781 | * make sure that we do not delete all the addresses in the | |
782 | * association. | |
783 | */ | |
1da177e4 LT |
784 | bp = &asoc->base.bind_addr; |
785 | laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs, | |
786 | addrcnt, sp); | |
8a07eb0a MH |
787 | if ((laddr == NULL) && (addrcnt == 1)) { |
788 | if (asoc->asconf_addr_del_pending) | |
789 | continue; | |
790 | asoc->asconf_addr_del_pending = | |
791 | kzalloc(sizeof(union sctp_addr), GFP_ATOMIC); | |
6d65e5ee MH |
792 | if (asoc->asconf_addr_del_pending == NULL) { |
793 | retval = -ENOMEM; | |
794 | goto out; | |
795 | } | |
8a07eb0a MH |
796 | asoc->asconf_addr_del_pending->sa.sa_family = |
797 | addrs->sa_family; | |
798 | asoc->asconf_addr_del_pending->v4.sin_port = | |
799 | htons(bp->port); | |
800 | if (addrs->sa_family == AF_INET) { | |
801 | struct sockaddr_in *sin; | |
802 | ||
803 | sin = (struct sockaddr_in *)addrs; | |
804 | asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr; | |
805 | } else if (addrs->sa_family == AF_INET6) { | |
806 | struct sockaddr_in6 *sin6; | |
807 | ||
808 | sin6 = (struct sockaddr_in6 *)addrs; | |
4e3fd7a0 | 809 | asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr; |
8a07eb0a MH |
810 | } |
811 | SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ", | |
812 | " at %p\n", asoc, asoc->asconf_addr_del_pending, | |
813 | asoc->asconf_addr_del_pending); | |
814 | asoc->src_out_of_asoc_ok = 1; | |
815 | stored = 1; | |
816 | goto skip_mkasconf; | |
817 | } | |
1da177e4 | 818 | |
559cf710 VY |
819 | /* We do not need RCU protection throughout this loop |
820 | * because this is done under a socket lock from the | |
821 | * setsockopt call. | |
822 | */ | |
1da177e4 LT |
823 | chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt, |
824 | SCTP_PARAM_DEL_IP); | |
825 | if (!chunk) { | |
826 | retval = -ENOMEM; | |
827 | goto out; | |
828 | } | |
829 | ||
8a07eb0a | 830 | skip_mkasconf: |
dc022a98 SS |
831 | /* Reset use_as_src flag for the addresses in the bind address |
832 | * list that are to be deleted. | |
833 | */ | |
dc022a98 SS |
834 | addr_buf = addrs; |
835 | for (i = 0; i < addrcnt; i++) { | |
ea110733 | 836 | laddr = addr_buf; |
dc022a98 | 837 | af = sctp_get_af_specific(laddr->v4.sin_family); |
559cf710 | 838 | list_for_each_entry(saddr, &bp->address_list, list) { |
5f242a13 | 839 | if (sctp_cmp_addr_exact(&saddr->a, laddr)) |
f57d96b2 | 840 | saddr->state = SCTP_ADDR_DEL; |
dc022a98 SS |
841 | } |
842 | addr_buf += af->sockaddr_len; | |
843 | } | |
1da177e4 | 844 | |
dc022a98 SS |
845 | /* Update the route and saddr entries for all the transports |
846 | * as some of the addresses in the bind address list are | |
847 | * about to be deleted and cannot be used as source addresses. | |
1da177e4 | 848 | */ |
9dbc15f0 RD |
849 | list_for_each_entry(transport, &asoc->peer.transport_addr_list, |
850 | transports) { | |
dc022a98 SS |
851 | dst_release(transport->dst); |
852 | sctp_transport_route(transport, NULL, | |
853 | sctp_sk(asoc->base.sk)); | |
854 | } | |
855 | ||
8a07eb0a MH |
856 | if (stored) |
857 | /* We don't need to transmit ASCONF */ | |
858 | continue; | |
dc022a98 | 859 | retval = sctp_send_asconf(asoc, chunk); |
1da177e4 LT |
860 | } |
861 | out: | |
862 | return retval; | |
863 | } | |
864 | ||
9f7d653b MH |
865 | /* set addr events to assocs in the endpoint. ep and addr_wq must be locked */ |
866 | int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw) | |
867 | { | |
868 | struct sock *sk = sctp_opt2sk(sp); | |
869 | union sctp_addr *addr; | |
870 | struct sctp_af *af; | |
871 | ||
872 | /* It is safe to write port space in caller. */ | |
873 | addr = &addrw->a; | |
874 | addr->v4.sin_port = htons(sp->ep->base.bind_addr.port); | |
875 | af = sctp_get_af_specific(addr->sa.sa_family); | |
876 | if (!af) | |
877 | return -EINVAL; | |
878 | if (sctp_verify_addr(sk, addr, af->sockaddr_len)) | |
879 | return -EINVAL; | |
880 | ||
881 | if (addrw->state == SCTP_ADDR_NEW) | |
882 | return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1); | |
883 | else | |
884 | return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1); | |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* Helper for tunneling sctp_bindx() requests through sctp_setsockopt() |
888 | * | |
889 | * API 8.1 | |
890 | * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt, | |
891 | * int flags); | |
892 | * | |
893 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
894 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
895 | * or IPv6 addresses. | |
896 | * | |
897 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
898 | * Section 3.1.2 for this usage. | |
899 | * | |
900 | * addrs is a pointer to an array of one or more socket addresses. Each | |
901 | * address is contained in its appropriate structure (i.e. struct | |
902 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
23c435f7 | 903 | * must be used to distinguish the address length (note that this |
1da177e4 LT |
904 | * representation is termed a "packed array" of addresses). The caller |
905 | * specifies the number of addresses in the array with addrcnt. | |
906 | * | |
907 | * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns | |
908 | * -1, and sets errno to the appropriate error code. | |
909 | * | |
910 | * For SCTP, the port given in each socket address must be the same, or | |
911 | * sctp_bindx() will fail, setting errno to EINVAL. | |
912 | * | |
913 | * The flags parameter is formed from the bitwise OR of zero or more of | |
914 | * the following currently defined flags: | |
915 | * | |
916 | * SCTP_BINDX_ADD_ADDR | |
917 | * | |
918 | * SCTP_BINDX_REM_ADDR | |
919 | * | |
920 | * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the | |
921 | * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given | |
922 | * addresses from the association. The two flags are mutually exclusive; | |
923 | * if both are given, sctp_bindx() will fail with EINVAL. A caller may | |
924 | * not remove all addresses from an association; sctp_bindx() will | |
925 | * reject such an attempt with EINVAL. | |
926 | * | |
927 | * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate | |
928 | * additional addresses with an endpoint after calling bind(). Or use | |
929 | * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening | |
930 | * socket is associated with so that no new association accepted will be | |
931 | * associated with those addresses. If the endpoint supports dynamic | |
932 | * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a | |
933 | * endpoint to send the appropriate message to the peer to change the | |
934 | * peers address lists. | |
935 | * | |
936 | * Adding and removing addresses from a connected association is | |
937 | * optional functionality. Implementations that do not support this | |
938 | * functionality should return EOPNOTSUPP. | |
939 | * | |
940 | * Basically do nothing but copying the addresses from user to kernel | |
941 | * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk. | |
3f7a87d2 FF |
942 | * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() |
943 | * from userspace. | |
1da177e4 LT |
944 | * |
945 | * We don't use copy_from_user() for optimization: we first do the | |
946 | * sanity checks (buffer size -fast- and access check-healthy | |
947 | * pointer); if all of those succeed, then we can alloc the memory | |
948 | * (expensive operation) needed to copy the data to kernel. Then we do | |
949 | * the copying without checking the user space area | |
950 | * (__copy_from_user()). | |
951 | * | |
952 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
953 | * it. | |
954 | * | |
955 | * sk The sk of the socket | |
956 | * addrs The pointer to the addresses in user land | |
957 | * addrssize Size of the addrs buffer | |
958 | * op Operation to perform (add or remove, see the flags of | |
959 | * sctp_bindx) | |
960 | * | |
961 | * Returns 0 if ok, <0 errno code on error. | |
962 | */ | |
dda91928 DB |
963 | static int sctp_setsockopt_bindx(struct sock* sk, |
964 | struct sockaddr __user *addrs, | |
965 | int addrs_size, int op) | |
1da177e4 LT |
966 | { |
967 | struct sockaddr *kaddrs; | |
968 | int err; | |
969 | int addrcnt = 0; | |
970 | int walk_size = 0; | |
971 | struct sockaddr *sa_addr; | |
972 | void *addr_buf; | |
973 | struct sctp_af *af; | |
974 | ||
d3e9a1dc | 975 | SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p" |
1da177e4 LT |
976 | " addrs_size %d opt %d\n", sk, addrs, addrs_size, op); |
977 | ||
978 | if (unlikely(addrs_size <= 0)) | |
979 | return -EINVAL; | |
980 | ||
981 | /* Check the user passed a healthy pointer. */ | |
982 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
983 | return -EFAULT; | |
984 | ||
985 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 986 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
1da177e4 LT |
987 | if (unlikely(!kaddrs)) |
988 | return -ENOMEM; | |
989 | ||
990 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
991 | kfree(kaddrs); | |
992 | return -EFAULT; | |
993 | } | |
994 | ||
d808ad9a | 995 | /* Walk through the addrs buffer and count the number of addresses. */ |
1da177e4 LT |
996 | addr_buf = kaddrs; |
997 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
998 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
999 | kfree(kaddrs); | |
1000 | return -EINVAL; | |
1001 | } | |
1002 | ||
ea110733 | 1003 | sa_addr = addr_buf; |
1da177e4 LT |
1004 | af = sctp_get_af_specific(sa_addr->sa_family); |
1005 | ||
1006 | /* If the address family is not supported or if this address | |
1007 | * causes the address buffer to overflow return EINVAL. | |
d808ad9a | 1008 | */ |
1da177e4 LT |
1009 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { |
1010 | kfree(kaddrs); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | addrcnt++; | |
1014 | addr_buf += af->sockaddr_len; | |
1015 | walk_size += af->sockaddr_len; | |
1016 | } | |
1017 | ||
1018 | /* Do the work. */ | |
1019 | switch (op) { | |
1020 | case SCTP_BINDX_ADD_ADDR: | |
1021 | err = sctp_bindx_add(sk, kaddrs, addrcnt); | |
1022 | if (err) | |
1023 | goto out; | |
1024 | err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt); | |
1025 | break; | |
1026 | ||
1027 | case SCTP_BINDX_REM_ADDR: | |
1028 | err = sctp_bindx_rem(sk, kaddrs, addrcnt); | |
1029 | if (err) | |
1030 | goto out; | |
1031 | err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt); | |
1032 | break; | |
1033 | ||
1034 | default: | |
1035 | err = -EINVAL; | |
1036 | break; | |
3ff50b79 | 1037 | } |
1da177e4 LT |
1038 | |
1039 | out: | |
1040 | kfree(kaddrs); | |
1041 | ||
1042 | return err; | |
1043 | } | |
1044 | ||
3f7a87d2 FF |
1045 | /* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size) |
1046 | * | |
1047 | * Common routine for handling connect() and sctp_connectx(). | |
1048 | * Connect will come in with just a single address. | |
1049 | */ | |
1050 | static int __sctp_connect(struct sock* sk, | |
1051 | struct sockaddr *kaddrs, | |
88a0a948 VY |
1052 | int addrs_size, |
1053 | sctp_assoc_t *assoc_id) | |
3f7a87d2 | 1054 | { |
55e26eb9 | 1055 | struct net *net = sock_net(sk); |
3f7a87d2 FF |
1056 | struct sctp_sock *sp; |
1057 | struct sctp_endpoint *ep; | |
1058 | struct sctp_association *asoc = NULL; | |
1059 | struct sctp_association *asoc2; | |
1060 | struct sctp_transport *transport; | |
1061 | union sctp_addr to; | |
1062 | struct sctp_af *af; | |
1063 | sctp_scope_t scope; | |
1064 | long timeo; | |
1065 | int err = 0; | |
1066 | int addrcnt = 0; | |
1067 | int walk_size = 0; | |
e4d1feab | 1068 | union sctp_addr *sa_addr = NULL; |
3f7a87d2 | 1069 | void *addr_buf; |
16d00fb7 | 1070 | unsigned short port; |
f50f95ca | 1071 | unsigned int f_flags = 0; |
3f7a87d2 FF |
1072 | |
1073 | sp = sctp_sk(sk); | |
1074 | ep = sp->ep; | |
1075 | ||
1076 | /* connect() cannot be done on a socket that is already in ESTABLISHED | |
1077 | * state - UDP-style peeled off socket or a TCP-style socket that | |
1078 | * is already connected. | |
1079 | * It cannot be done even on a TCP-style listening socket. | |
1080 | */ | |
1081 | if (sctp_sstate(sk, ESTABLISHED) || | |
1082 | (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) { | |
1083 | err = -EISCONN; | |
1084 | goto out_free; | |
1085 | } | |
1086 | ||
1087 | /* Walk through the addrs buffer and count the number of addresses. */ | |
1088 | addr_buf = kaddrs; | |
1089 | while (walk_size < addrs_size) { | |
d7e0d19a DR |
1090 | if (walk_size + sizeof(sa_family_t) > addrs_size) { |
1091 | err = -EINVAL; | |
1092 | goto out_free; | |
1093 | } | |
1094 | ||
ea110733 | 1095 | sa_addr = addr_buf; |
4bdf4b5f | 1096 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
3f7a87d2 FF |
1097 | |
1098 | /* If the address family is not supported or if this address | |
1099 | * causes the address buffer to overflow return EINVAL. | |
1100 | */ | |
1101 | if (!af || (walk_size + af->sockaddr_len) > addrs_size) { | |
1102 | err = -EINVAL; | |
1103 | goto out_free; | |
1104 | } | |
1105 | ||
d7e0d19a DR |
1106 | port = ntohs(sa_addr->v4.sin_port); |
1107 | ||
e4d1feab VY |
1108 | /* Save current address so we can work with it */ |
1109 | memcpy(&to, sa_addr, af->sockaddr_len); | |
1110 | ||
1111 | err = sctp_verify_addr(sk, &to, af->sockaddr_len); | |
3f7a87d2 FF |
1112 | if (err) |
1113 | goto out_free; | |
1114 | ||
16d00fb7 VY |
1115 | /* Make sure the destination port is correctly set |
1116 | * in all addresses. | |
1117 | */ | |
524fba6c WY |
1118 | if (asoc && asoc->peer.port && asoc->peer.port != port) { |
1119 | err = -EINVAL; | |
16d00fb7 | 1120 | goto out_free; |
524fba6c | 1121 | } |
3f7a87d2 FF |
1122 | |
1123 | /* Check if there already is a matching association on the | |
1124 | * endpoint (other than the one created here). | |
1125 | */ | |
e4d1feab | 1126 | asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
3f7a87d2 FF |
1127 | if (asoc2 && asoc2 != asoc) { |
1128 | if (asoc2->state >= SCTP_STATE_ESTABLISHED) | |
1129 | err = -EISCONN; | |
1130 | else | |
1131 | err = -EALREADY; | |
1132 | goto out_free; | |
1133 | } | |
1134 | ||
1135 | /* If we could not find a matching association on the endpoint, | |
1136 | * make sure that there is no peeled-off association matching | |
1137 | * the peer address even on another socket. | |
1138 | */ | |
e4d1feab | 1139 | if (sctp_endpoint_is_peeled_off(ep, &to)) { |
3f7a87d2 FF |
1140 | err = -EADDRNOTAVAIL; |
1141 | goto out_free; | |
1142 | } | |
1143 | ||
1144 | if (!asoc) { | |
1145 | /* If a bind() or sctp_bindx() is not called prior to | |
1146 | * an sctp_connectx() call, the system picks an | |
1147 | * ephemeral port and will choose an address set | |
1148 | * equivalent to binding with a wildcard address. | |
1149 | */ | |
1150 | if (!ep->base.bind_addr.port) { | |
1151 | if (sctp_autobind(sk)) { | |
1152 | err = -EAGAIN; | |
1153 | goto out_free; | |
1154 | } | |
64a0c1c8 ISJ |
1155 | } else { |
1156 | /* | |
d808ad9a YH |
1157 | * If an unprivileged user inherits a 1-many |
1158 | * style socket with open associations on a | |
1159 | * privileged port, it MAY be permitted to | |
1160 | * accept new associations, but it SHOULD NOT | |
64a0c1c8 ISJ |
1161 | * be permitted to open new associations. |
1162 | */ | |
1163 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1164 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1165 | err = -EACCES; |
1166 | goto out_free; | |
1167 | } | |
3f7a87d2 FF |
1168 | } |
1169 | ||
e4d1feab | 1170 | scope = sctp_scope(&to); |
3f7a87d2 FF |
1171 | asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); |
1172 | if (!asoc) { | |
1173 | err = -ENOMEM; | |
1174 | goto out_free; | |
1175 | } | |
409b95af VY |
1176 | |
1177 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, | |
1178 | GFP_KERNEL); | |
1179 | if (err < 0) { | |
1180 | goto out_free; | |
1181 | } | |
1182 | ||
3f7a87d2 FF |
1183 | } |
1184 | ||
1185 | /* Prime the peer's transport structures. */ | |
e4d1feab | 1186 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, |
3f7a87d2 FF |
1187 | SCTP_UNKNOWN); |
1188 | if (!transport) { | |
1189 | err = -ENOMEM; | |
1190 | goto out_free; | |
1191 | } | |
1192 | ||
1193 | addrcnt++; | |
1194 | addr_buf += af->sockaddr_len; | |
1195 | walk_size += af->sockaddr_len; | |
1196 | } | |
1197 | ||
c6ba68a2 VY |
1198 | /* In case the user of sctp_connectx() wants an association |
1199 | * id back, assign one now. | |
1200 | */ | |
1201 | if (assoc_id) { | |
1202 | err = sctp_assoc_set_id(asoc, GFP_KERNEL); | |
1203 | if (err < 0) | |
1204 | goto out_free; | |
1205 | } | |
1206 | ||
55e26eb9 | 1207 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
3f7a87d2 FF |
1208 | if (err < 0) { |
1209 | goto out_free; | |
1210 | } | |
1211 | ||
1212 | /* Initialize sk's dport and daddr for getpeername() */ | |
c720c7e8 | 1213 | inet_sk(sk)->inet_dport = htons(asoc->peer.port); |
e4d1feab VY |
1214 | af = sctp_get_af_specific(sa_addr->sa.sa_family); |
1215 | af->to_sk_daddr(sa_addr, sk); | |
8de8c873 | 1216 | sk->sk_err = 0; |
3f7a87d2 | 1217 | |
f50f95ca VY |
1218 | /* in-kernel sockets don't generally have a file allocated to them |
1219 | * if all they do is call sock_create_kern(). | |
1220 | */ | |
1221 | if (sk->sk_socket->file) | |
1222 | f_flags = sk->sk_socket->file->f_flags; | |
1223 | ||
1224 | timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK); | |
1225 | ||
3f7a87d2 | 1226 | err = sctp_wait_for_connect(asoc, &timeo); |
c6ba68a2 | 1227 | if ((err == 0 || err == -EINPROGRESS) && assoc_id) |
88a0a948 | 1228 | *assoc_id = asoc->assoc_id; |
3f7a87d2 FF |
1229 | |
1230 | /* Don't free association on exit. */ | |
1231 | asoc = NULL; | |
1232 | ||
1233 | out_free: | |
1234 | ||
1235 | SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p" | |
d808ad9a YH |
1236 | " kaddrs: %p err: %d\n", |
1237 | asoc, kaddrs, err); | |
2eebc1e1 NH |
1238 | if (asoc) { |
1239 | /* sctp_primitive_ASSOCIATE may have added this association | |
1240 | * To the hash table, try to unhash it, just in case, its a noop | |
1241 | * if it wasn't hashed so we're safe | |
1242 | */ | |
1243 | sctp_unhash_established(asoc); | |
3f7a87d2 | 1244 | sctp_association_free(asoc); |
2eebc1e1 | 1245 | } |
3f7a87d2 FF |
1246 | return err; |
1247 | } | |
1248 | ||
1249 | /* Helper for tunneling sctp_connectx() requests through sctp_setsockopt() | |
1250 | * | |
1251 | * API 8.9 | |
88a0a948 VY |
1252 | * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt, |
1253 | * sctp_assoc_t *asoc); | |
3f7a87d2 FF |
1254 | * |
1255 | * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses. | |
1256 | * If the sd is an IPv6 socket, the addresses passed can either be IPv4 | |
1257 | * or IPv6 addresses. | |
1258 | * | |
1259 | * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see | |
1260 | * Section 3.1.2 for this usage. | |
1261 | * | |
1262 | * addrs is a pointer to an array of one or more socket addresses. Each | |
1263 | * address is contained in its appropriate structure (i.e. struct | |
1264 | * sockaddr_in or struct sockaddr_in6) the family of the address type | |
1265 | * must be used to distengish the address length (note that this | |
1266 | * representation is termed a "packed array" of addresses). The caller | |
1267 | * specifies the number of addresses in the array with addrcnt. | |
1268 | * | |
88a0a948 VY |
1269 | * On success, sctp_connectx() returns 0. It also sets the assoc_id to |
1270 | * the association id of the new association. On failure, sctp_connectx() | |
1271 | * returns -1, and sets errno to the appropriate error code. The assoc_id | |
1272 | * is not touched by the kernel. | |
3f7a87d2 FF |
1273 | * |
1274 | * For SCTP, the port given in each socket address must be the same, or | |
1275 | * sctp_connectx() will fail, setting errno to EINVAL. | |
1276 | * | |
1277 | * An application can use sctp_connectx to initiate an association with | |
1278 | * an endpoint that is multi-homed. Much like sctp_bindx() this call | |
1279 | * allows a caller to specify multiple addresses at which a peer can be | |
1280 | * reached. The way the SCTP stack uses the list of addresses to set up | |
25985edc | 1281 | * the association is implementation dependent. This function only |
3f7a87d2 FF |
1282 | * specifies that the stack will try to make use of all the addresses in |
1283 | * the list when needed. | |
1284 | * | |
1285 | * Note that the list of addresses passed in is only used for setting up | |
1286 | * the association. It does not necessarily equal the set of addresses | |
1287 | * the peer uses for the resulting association. If the caller wants to | |
1288 | * find out the set of peer addresses, it must use sctp_getpaddrs() to | |
1289 | * retrieve them after the association has been set up. | |
1290 | * | |
1291 | * Basically do nothing but copying the addresses from user to kernel | |
1292 | * land and invoking either sctp_connectx(). This is used for tunneling | |
1293 | * the sctp_connectx() request through sctp_setsockopt() from userspace. | |
1294 | * | |
1295 | * We don't use copy_from_user() for optimization: we first do the | |
1296 | * sanity checks (buffer size -fast- and access check-healthy | |
1297 | * pointer); if all of those succeed, then we can alloc the memory | |
1298 | * (expensive operation) needed to copy the data to kernel. Then we do | |
1299 | * the copying without checking the user space area | |
1300 | * (__copy_from_user()). | |
1301 | * | |
1302 | * On exit there is no need to do sockfd_put(), sys_setsockopt() does | |
1303 | * it. | |
1304 | * | |
1305 | * sk The sk of the socket | |
1306 | * addrs The pointer to the addresses in user land | |
1307 | * addrssize Size of the addrs buffer | |
1308 | * | |
88a0a948 | 1309 | * Returns >=0 if ok, <0 errno code on error. |
3f7a87d2 | 1310 | */ |
dda91928 | 1311 | static int __sctp_setsockopt_connectx(struct sock* sk, |
3f7a87d2 | 1312 | struct sockaddr __user *addrs, |
88a0a948 VY |
1313 | int addrs_size, |
1314 | sctp_assoc_t *assoc_id) | |
3f7a87d2 FF |
1315 | { |
1316 | int err = 0; | |
1317 | struct sockaddr *kaddrs; | |
1318 | ||
1319 | SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n", | |
0dc47877 | 1320 | __func__, sk, addrs, addrs_size); |
3f7a87d2 FF |
1321 | |
1322 | if (unlikely(addrs_size <= 0)) | |
1323 | return -EINVAL; | |
1324 | ||
1325 | /* Check the user passed a healthy pointer. */ | |
1326 | if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size))) | |
1327 | return -EFAULT; | |
1328 | ||
1329 | /* Alloc space for the address array in kernel memory. */ | |
8b3a7005 | 1330 | kaddrs = kmalloc(addrs_size, GFP_KERNEL); |
3f7a87d2 FF |
1331 | if (unlikely(!kaddrs)) |
1332 | return -ENOMEM; | |
1333 | ||
1334 | if (__copy_from_user(kaddrs, addrs, addrs_size)) { | |
1335 | err = -EFAULT; | |
1336 | } else { | |
88a0a948 | 1337 | err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id); |
3f7a87d2 FF |
1338 | } |
1339 | ||
1340 | kfree(kaddrs); | |
88a0a948 | 1341 | |
3f7a87d2 FF |
1342 | return err; |
1343 | } | |
1344 | ||
88a0a948 VY |
1345 | /* |
1346 | * This is an older interface. It's kept for backward compatibility | |
1347 | * to the option that doesn't provide association id. | |
1348 | */ | |
dda91928 DB |
1349 | static int sctp_setsockopt_connectx_old(struct sock* sk, |
1350 | struct sockaddr __user *addrs, | |
1351 | int addrs_size) | |
88a0a948 VY |
1352 | { |
1353 | return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL); | |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * New interface for the API. The since the API is done with a socket | |
1358 | * option, to make it simple we feed back the association id is as a return | |
1359 | * indication to the call. Error is always negative and association id is | |
1360 | * always positive. | |
1361 | */ | |
dda91928 DB |
1362 | static int sctp_setsockopt_connectx(struct sock* sk, |
1363 | struct sockaddr __user *addrs, | |
1364 | int addrs_size) | |
88a0a948 VY |
1365 | { |
1366 | sctp_assoc_t assoc_id = 0; | |
1367 | int err = 0; | |
1368 | ||
1369 | err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id); | |
1370 | ||
1371 | if (err) | |
1372 | return err; | |
1373 | else | |
1374 | return assoc_id; | |
1375 | } | |
1376 | ||
c6ba68a2 | 1377 | /* |
f9c67811 VY |
1378 | * New (hopefully final) interface for the API. |
1379 | * We use the sctp_getaddrs_old structure so that use-space library | |
1380 | * can avoid any unnecessary allocations. The only defferent part | |
1381 | * is that we store the actual length of the address buffer into the | |
1382 | * addrs_num structure member. That way we can re-use the existing | |
1383 | * code. | |
c6ba68a2 | 1384 | */ |
dda91928 DB |
1385 | static int sctp_getsockopt_connectx3(struct sock* sk, int len, |
1386 | char __user *optval, | |
1387 | int __user *optlen) | |
c6ba68a2 | 1388 | { |
f9c67811 | 1389 | struct sctp_getaddrs_old param; |
c6ba68a2 VY |
1390 | sctp_assoc_t assoc_id = 0; |
1391 | int err = 0; | |
1392 | ||
f9c67811 | 1393 | if (len < sizeof(param)) |
c6ba68a2 VY |
1394 | return -EINVAL; |
1395 | ||
f9c67811 VY |
1396 | if (copy_from_user(¶m, optval, sizeof(param))) |
1397 | return -EFAULT; | |
1398 | ||
c6ba68a2 | 1399 | err = __sctp_setsockopt_connectx(sk, |
f9c67811 VY |
1400 | (struct sockaddr __user *)param.addrs, |
1401 | param.addr_num, &assoc_id); | |
c6ba68a2 VY |
1402 | |
1403 | if (err == 0 || err == -EINPROGRESS) { | |
1404 | if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) | |
1405 | return -EFAULT; | |
1406 | if (put_user(sizeof(assoc_id), optlen)) | |
1407 | return -EFAULT; | |
1408 | } | |
1409 | ||
1410 | return err; | |
1411 | } | |
1412 | ||
1da177e4 LT |
1413 | /* API 3.1.4 close() - UDP Style Syntax |
1414 | * Applications use close() to perform graceful shutdown (as described in | |
1415 | * Section 10.1 of [SCTP]) on ALL the associations currently represented | |
1416 | * by a UDP-style socket. | |
1417 | * | |
1418 | * The syntax is | |
1419 | * | |
1420 | * ret = close(int sd); | |
1421 | * | |
1422 | * sd - the socket descriptor of the associations to be closed. | |
1423 | * | |
1424 | * To gracefully shutdown a specific association represented by the | |
1425 | * UDP-style socket, an application should use the sendmsg() call, | |
1426 | * passing no user data, but including the appropriate flag in the | |
1427 | * ancillary data (see Section xxxx). | |
1428 | * | |
1429 | * If sd in the close() call is a branched-off socket representing only | |
1430 | * one association, the shutdown is performed on that association only. | |
1431 | * | |
1432 | * 4.1.6 close() - TCP Style Syntax | |
1433 | * | |
1434 | * Applications use close() to gracefully close down an association. | |
1435 | * | |
1436 | * The syntax is: | |
1437 | * | |
1438 | * int close(int sd); | |
1439 | * | |
1440 | * sd - the socket descriptor of the association to be closed. | |
1441 | * | |
1442 | * After an application calls close() on a socket descriptor, no further | |
1443 | * socket operations will succeed on that descriptor. | |
1444 | * | |
1445 | * API 7.1.4 SO_LINGER | |
1446 | * | |
1447 | * An application using the TCP-style socket can use this option to | |
1448 | * perform the SCTP ABORT primitive. The linger option structure is: | |
1449 | * | |
1450 | * struct linger { | |
1451 | * int l_onoff; // option on/off | |
1452 | * int l_linger; // linger time | |
1453 | * }; | |
1454 | * | |
1455 | * To enable the option, set l_onoff to 1. If the l_linger value is set | |
1456 | * to 0, calling close() is the same as the ABORT primitive. If the | |
1457 | * value is set to a negative value, the setsockopt() call will return | |
1458 | * an error. If the value is set to a positive value linger_time, the | |
1459 | * close() can be blocked for at most linger_time ms. If the graceful | |
1460 | * shutdown phase does not finish during this period, close() will | |
1461 | * return but the graceful shutdown phase continues in the system. | |
1462 | */ | |
dda91928 | 1463 | static void sctp_close(struct sock *sk, long timeout) |
1da177e4 | 1464 | { |
55e26eb9 | 1465 | struct net *net = sock_net(sk); |
1da177e4 LT |
1466 | struct sctp_endpoint *ep; |
1467 | struct sctp_association *asoc; | |
1468 | struct list_head *pos, *temp; | |
cd4fcc70 | 1469 | unsigned int data_was_unread; |
1da177e4 LT |
1470 | |
1471 | SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout); | |
1472 | ||
1473 | sctp_lock_sock(sk); | |
1474 | sk->sk_shutdown = SHUTDOWN_MASK; | |
bec9640b | 1475 | sk->sk_state = SCTP_SS_CLOSING; |
1da177e4 LT |
1476 | |
1477 | ep = sctp_sk(sk)->ep; | |
1478 | ||
cd4fcc70 TG |
1479 | /* Clean up any skbs sitting on the receive queue. */ |
1480 | data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue); | |
1481 | data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby); | |
1482 | ||
61c9fed4 | 1483 | /* Walk all associations on an endpoint. */ |
1da177e4 LT |
1484 | list_for_each_safe(pos, temp, &ep->asocs) { |
1485 | asoc = list_entry(pos, struct sctp_association, asocs); | |
1486 | ||
1487 | if (sctp_style(sk, TCP)) { | |
1488 | /* A closed association can still be in the list if | |
1489 | * it belongs to a TCP-style listening socket that is | |
1490 | * not yet accepted. If so, free it. If not, send an | |
1491 | * ABORT or SHUTDOWN based on the linger options. | |
1492 | */ | |
1493 | if (sctp_state(asoc, CLOSED)) { | |
1494 | sctp_unhash_established(asoc); | |
1495 | sctp_association_free(asoc); | |
b89498a1 VY |
1496 | continue; |
1497 | } | |
1498 | } | |
1da177e4 | 1499 | |
cd4fcc70 TG |
1500 | if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) || |
1501 | !skb_queue_empty(&asoc->ulpq.reasm) || | |
1502 | (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) { | |
b9ac8672 SS |
1503 | struct sctp_chunk *chunk; |
1504 | ||
1505 | chunk = sctp_make_abort_user(asoc, NULL, 0); | |
1506 | if (chunk) | |
55e26eb9 | 1507 | sctp_primitive_ABORT(net, asoc, chunk); |
b9ac8672 | 1508 | } else |
55e26eb9 | 1509 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1510 | } |
1511 | ||
1da177e4 LT |
1512 | /* On a TCP-style socket, block for at most linger_time if set. */ |
1513 | if (sctp_style(sk, TCP) && timeout) | |
1514 | sctp_wait_for_close(sk, timeout); | |
1515 | ||
1516 | /* This will run the backlog queue. */ | |
1517 | sctp_release_sock(sk); | |
1518 | ||
1519 | /* Supposedly, no process has access to the socket, but | |
1520 | * the net layers still may. | |
1521 | */ | |
1522 | sctp_local_bh_disable(); | |
1523 | sctp_bh_lock_sock(sk); | |
1524 | ||
1525 | /* Hold the sock, since sk_common_release() will put sock_put() | |
1526 | * and we have just a little more cleanup. | |
1527 | */ | |
1528 | sock_hold(sk); | |
1529 | sk_common_release(sk); | |
1530 | ||
1531 | sctp_bh_unlock_sock(sk); | |
1532 | sctp_local_bh_enable(); | |
1533 | ||
1534 | sock_put(sk); | |
1535 | ||
1536 | SCTP_DBG_OBJCNT_DEC(sock); | |
1537 | } | |
1538 | ||
1539 | /* Handle EPIPE error. */ | |
1540 | static int sctp_error(struct sock *sk, int flags, int err) | |
1541 | { | |
1542 | if (err == -EPIPE) | |
1543 | err = sock_error(sk) ? : -EPIPE; | |
1544 | if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) | |
1545 | send_sig(SIGPIPE, current, 0); | |
1546 | return err; | |
1547 | } | |
1548 | ||
1549 | /* API 3.1.3 sendmsg() - UDP Style Syntax | |
1550 | * | |
1551 | * An application uses sendmsg() and recvmsg() calls to transmit data to | |
1552 | * and receive data from its peer. | |
1553 | * | |
1554 | * ssize_t sendmsg(int socket, const struct msghdr *message, | |
1555 | * int flags); | |
1556 | * | |
1557 | * socket - the socket descriptor of the endpoint. | |
1558 | * message - pointer to the msghdr structure which contains a single | |
1559 | * user message and possibly some ancillary data. | |
1560 | * | |
1561 | * See Section 5 for complete description of the data | |
1562 | * structures. | |
1563 | * | |
1564 | * flags - flags sent or received with the user message, see Section | |
1565 | * 5 for complete description of the flags. | |
1566 | * | |
1567 | * Note: This function could use a rewrite especially when explicit | |
1568 | * connect support comes in. | |
1569 | */ | |
1570 | /* BUG: We do not implement the equivalent of sk_stream_wait_memory(). */ | |
1571 | ||
dda91928 | 1572 | static int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *); |
1da177e4 | 1573 | |
dda91928 DB |
1574 | static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk, |
1575 | struct msghdr *msg, size_t msg_len) | |
1da177e4 | 1576 | { |
55e26eb9 | 1577 | struct net *net = sock_net(sk); |
1da177e4 LT |
1578 | struct sctp_sock *sp; |
1579 | struct sctp_endpoint *ep; | |
1580 | struct sctp_association *new_asoc=NULL, *asoc=NULL; | |
1581 | struct sctp_transport *transport, *chunk_tp; | |
1582 | struct sctp_chunk *chunk; | |
dce116ae | 1583 | union sctp_addr to; |
1da177e4 | 1584 | struct sockaddr *msg_name = NULL; |
517aa0bc | 1585 | struct sctp_sndrcvinfo default_sinfo; |
1da177e4 LT |
1586 | struct sctp_sndrcvinfo *sinfo; |
1587 | struct sctp_initmsg *sinit; | |
1588 | sctp_assoc_t associd = 0; | |
1589 | sctp_cmsgs_t cmsgs = { NULL }; | |
1590 | int err; | |
1591 | sctp_scope_t scope; | |
1592 | long timeo; | |
1593 | __u16 sinfo_flags = 0; | |
1594 | struct sctp_datamsg *datamsg; | |
1da177e4 LT |
1595 | int msg_flags = msg->msg_flags; |
1596 | ||
1597 | SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n", | |
1598 | sk, msg, msg_len); | |
1599 | ||
1600 | err = 0; | |
1601 | sp = sctp_sk(sk); | |
1602 | ep = sp->ep; | |
1603 | ||
3f7a87d2 | 1604 | SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep); |
1da177e4 LT |
1605 | |
1606 | /* We cannot send a message over a TCP-style listening socket. */ | |
1607 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) { | |
1608 | err = -EPIPE; | |
1609 | goto out_nounlock; | |
1610 | } | |
1611 | ||
1612 | /* Parse out the SCTP CMSGs. */ | |
1613 | err = sctp_msghdr_parse(msg, &cmsgs); | |
1614 | ||
1615 | if (err) { | |
1616 | SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err); | |
1617 | goto out_nounlock; | |
1618 | } | |
1619 | ||
1620 | /* Fetch the destination address for this packet. This | |
1621 | * address only selects the association--it is not necessarily | |
1622 | * the address we will send to. | |
1623 | * For a peeled-off socket, msg_name is ignored. | |
1624 | */ | |
1625 | if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) { | |
1626 | int msg_namelen = msg->msg_namelen; | |
1627 | ||
1628 | err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name, | |
1629 | msg_namelen); | |
1630 | if (err) | |
1631 | return err; | |
1632 | ||
1633 | if (msg_namelen > sizeof(to)) | |
1634 | msg_namelen = sizeof(to); | |
1635 | memcpy(&to, msg->msg_name, msg_namelen); | |
1da177e4 LT |
1636 | msg_name = msg->msg_name; |
1637 | } | |
1638 | ||
1639 | sinfo = cmsgs.info; | |
1640 | sinit = cmsgs.init; | |
1641 | ||
1642 | /* Did the user specify SNDRCVINFO? */ | |
1643 | if (sinfo) { | |
1644 | sinfo_flags = sinfo->sinfo_flags; | |
1645 | associd = sinfo->sinfo_assoc_id; | |
1646 | } | |
1647 | ||
1648 | SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n", | |
1649 | msg_len, sinfo_flags); | |
1650 | ||
eaa5c54d ISJ |
1651 | /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */ |
1652 | if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) { | |
1da177e4 LT |
1653 | err = -EINVAL; |
1654 | goto out_nounlock; | |
1655 | } | |
1656 | ||
eaa5c54d ISJ |
1657 | /* If SCTP_EOF is set, no data can be sent. Disallow sending zero |
1658 | * length messages when SCTP_EOF|SCTP_ABORT is not set. | |
1659 | * If SCTP_ABORT is set, the message length could be non zero with | |
1da177e4 | 1660 | * the msg_iov set to the user abort reason. |
d808ad9a | 1661 | */ |
eaa5c54d ISJ |
1662 | if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) || |
1663 | (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) { | |
1da177e4 LT |
1664 | err = -EINVAL; |
1665 | goto out_nounlock; | |
1666 | } | |
1667 | ||
eaa5c54d | 1668 | /* If SCTP_ADDR_OVER is set, there must be an address |
1da177e4 LT |
1669 | * specified in msg_name. |
1670 | */ | |
eaa5c54d | 1671 | if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) { |
1da177e4 LT |
1672 | err = -EINVAL; |
1673 | goto out_nounlock; | |
1674 | } | |
1675 | ||
1676 | transport = NULL; | |
1677 | ||
1678 | SCTP_DEBUG_PRINTK("About to look up association.\n"); | |
1679 | ||
1680 | sctp_lock_sock(sk); | |
1681 | ||
1682 | /* If a msg_name has been specified, assume this is to be used. */ | |
1683 | if (msg_name) { | |
1684 | /* Look for a matching association on the endpoint. */ | |
dce116ae | 1685 | asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport); |
1da177e4 LT |
1686 | if (!asoc) { |
1687 | /* If we could not find a matching association on the | |
1688 | * endpoint, make sure that it is not a TCP-style | |
1689 | * socket that already has an association or there is | |
1690 | * no peeled-off association on another socket. | |
1691 | */ | |
1692 | if ((sctp_style(sk, TCP) && | |
1693 | sctp_sstate(sk, ESTABLISHED)) || | |
dce116ae | 1694 | sctp_endpoint_is_peeled_off(ep, &to)) { |
1da177e4 LT |
1695 | err = -EADDRNOTAVAIL; |
1696 | goto out_unlock; | |
1697 | } | |
1698 | } | |
1699 | } else { | |
1700 | asoc = sctp_id2assoc(sk, associd); | |
1701 | if (!asoc) { | |
1702 | err = -EPIPE; | |
1703 | goto out_unlock; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | if (asoc) { | |
1708 | SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc); | |
1709 | ||
1710 | /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED | |
1711 | * socket that has an association in CLOSED state. This can | |
1712 | * happen when an accepted socket has an association that is | |
1713 | * already CLOSED. | |
1714 | */ | |
1715 | if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) { | |
1716 | err = -EPIPE; | |
1717 | goto out_unlock; | |
1718 | } | |
1719 | ||
eaa5c54d | 1720 | if (sinfo_flags & SCTP_EOF) { |
1da177e4 LT |
1721 | SCTP_DEBUG_PRINTK("Shutting down association: %p\n", |
1722 | asoc); | |
55e26eb9 | 1723 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
1724 | err = 0; |
1725 | goto out_unlock; | |
1726 | } | |
eaa5c54d | 1727 | if (sinfo_flags & SCTP_ABORT) { |
c164a9ba SS |
1728 | |
1729 | chunk = sctp_make_abort_user(asoc, msg, msg_len); | |
1730 | if (!chunk) { | |
1731 | err = -ENOMEM; | |
1732 | goto out_unlock; | |
1733 | } | |
1734 | ||
1da177e4 | 1735 | SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc); |
55e26eb9 | 1736 | sctp_primitive_ABORT(net, asoc, chunk); |
1da177e4 LT |
1737 | err = 0; |
1738 | goto out_unlock; | |
1739 | } | |
1740 | } | |
1741 | ||
1742 | /* Do we need to create the association? */ | |
1743 | if (!asoc) { | |
1744 | SCTP_DEBUG_PRINTK("There is no association yet.\n"); | |
1745 | ||
eaa5c54d | 1746 | if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) { |
1da177e4 LT |
1747 | err = -EINVAL; |
1748 | goto out_unlock; | |
1749 | } | |
1750 | ||
1751 | /* Check for invalid stream against the stream counts, | |
1752 | * either the default or the user specified stream counts. | |
1753 | */ | |
1754 | if (sinfo) { | |
1755 | if (!sinit || (sinit && !sinit->sinit_num_ostreams)) { | |
1756 | /* Check against the defaults. */ | |
1757 | if (sinfo->sinfo_stream >= | |
1758 | sp->initmsg.sinit_num_ostreams) { | |
1759 | err = -EINVAL; | |
1760 | goto out_unlock; | |
1761 | } | |
1762 | } else { | |
1763 | /* Check against the requested. */ | |
1764 | if (sinfo->sinfo_stream >= | |
1765 | sinit->sinit_num_ostreams) { | |
1766 | err = -EINVAL; | |
1767 | goto out_unlock; | |
1768 | } | |
1769 | } | |
1770 | } | |
1771 | ||
1772 | /* | |
1773 | * API 3.1.2 bind() - UDP Style Syntax | |
1774 | * If a bind() or sctp_bindx() is not called prior to a | |
1775 | * sendmsg() call that initiates a new association, the | |
1776 | * system picks an ephemeral port and will choose an address | |
1777 | * set equivalent to binding with a wildcard address. | |
1778 | */ | |
1779 | if (!ep->base.bind_addr.port) { | |
1780 | if (sctp_autobind(sk)) { | |
1781 | err = -EAGAIN; | |
1782 | goto out_unlock; | |
1783 | } | |
64a0c1c8 ISJ |
1784 | } else { |
1785 | /* | |
1786 | * If an unprivileged user inherits a one-to-many | |
1787 | * style socket with open associations on a privileged | |
1788 | * port, it MAY be permitted to accept new associations, | |
1789 | * but it SHOULD NOT be permitted to open new | |
1790 | * associations. | |
1791 | */ | |
1792 | if (ep->base.bind_addr.port < PROT_SOCK && | |
3594698a | 1793 | !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) { |
64a0c1c8 ISJ |
1794 | err = -EACCES; |
1795 | goto out_unlock; | |
1796 | } | |
1da177e4 LT |
1797 | } |
1798 | ||
1799 | scope = sctp_scope(&to); | |
1800 | new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL); | |
1801 | if (!new_asoc) { | |
1802 | err = -ENOMEM; | |
1803 | goto out_unlock; | |
1804 | } | |
1805 | asoc = new_asoc; | |
409b95af VY |
1806 | err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL); |
1807 | if (err < 0) { | |
1808 | err = -ENOMEM; | |
1809 | goto out_free; | |
1810 | } | |
1da177e4 LT |
1811 | |
1812 | /* If the SCTP_INIT ancillary data is specified, set all | |
1813 | * the association init values accordingly. | |
1814 | */ | |
1815 | if (sinit) { | |
1816 | if (sinit->sinit_num_ostreams) { | |
1817 | asoc->c.sinit_num_ostreams = | |
1818 | sinit->sinit_num_ostreams; | |
1819 | } | |
1820 | if (sinit->sinit_max_instreams) { | |
1821 | asoc->c.sinit_max_instreams = | |
1822 | sinit->sinit_max_instreams; | |
1823 | } | |
1824 | if (sinit->sinit_max_attempts) { | |
1825 | asoc->max_init_attempts | |
1826 | = sinit->sinit_max_attempts; | |
1827 | } | |
1828 | if (sinit->sinit_max_init_timeo) { | |
d808ad9a | 1829 | asoc->max_init_timeo = |
1da177e4 LT |
1830 | msecs_to_jiffies(sinit->sinit_max_init_timeo); |
1831 | } | |
1832 | } | |
1833 | ||
1834 | /* Prime the peer's transport structures. */ | |
dce116ae | 1835 | transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN); |
1da177e4 LT |
1836 | if (!transport) { |
1837 | err = -ENOMEM; | |
1838 | goto out_free; | |
1839 | } | |
1da177e4 LT |
1840 | } |
1841 | ||
1842 | /* ASSERT: we have a valid association at this point. */ | |
1843 | SCTP_DEBUG_PRINTK("We have a valid association.\n"); | |
1844 | ||
1845 | if (!sinfo) { | |
1846 | /* If the user didn't specify SNDRCVINFO, make up one with | |
1847 | * some defaults. | |
1848 | */ | |
517aa0bc | 1849 | memset(&default_sinfo, 0, sizeof(default_sinfo)); |
1da177e4 LT |
1850 | default_sinfo.sinfo_stream = asoc->default_stream; |
1851 | default_sinfo.sinfo_flags = asoc->default_flags; | |
1852 | default_sinfo.sinfo_ppid = asoc->default_ppid; | |
1853 | default_sinfo.sinfo_context = asoc->default_context; | |
1854 | default_sinfo.sinfo_timetolive = asoc->default_timetolive; | |
1855 | default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc); | |
1856 | sinfo = &default_sinfo; | |
1857 | } | |
1858 | ||
1859 | /* API 7.1.7, the sndbuf size per association bounds the | |
1860 | * maximum size of data that can be sent in a single send call. | |
1861 | */ | |
1862 | if (msg_len > sk->sk_sndbuf) { | |
1863 | err = -EMSGSIZE; | |
1864 | goto out_free; | |
1865 | } | |
1866 | ||
8a479491 | 1867 | if (asoc->pmtu_pending) |
02f3d4ce | 1868 | sctp_assoc_pending_pmtu(sk, asoc); |
8a479491 | 1869 | |
1da177e4 LT |
1870 | /* If fragmentation is disabled and the message length exceeds the |
1871 | * association fragmentation point, return EMSGSIZE. The I-D | |
1872 | * does not specify what this error is, but this looks like | |
1873 | * a great fit. | |
1874 | */ | |
1875 | if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) { | |
1876 | err = -EMSGSIZE; | |
1877 | goto out_free; | |
1878 | } | |
1879 | ||
afd7614c JP |
1880 | /* Check for invalid stream. */ |
1881 | if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) { | |
1882 | err = -EINVAL; | |
1883 | goto out_free; | |
1da177e4 LT |
1884 | } |
1885 | ||
1886 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1887 | if (!sctp_wspace(asoc)) { | |
1888 | err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len); | |
1889 | if (err) | |
1890 | goto out_free; | |
1891 | } | |
1892 | ||
1893 | /* If an address is passed with the sendto/sendmsg call, it is used | |
1894 | * to override the primary destination address in the TCP model, or | |
eaa5c54d | 1895 | * when SCTP_ADDR_OVER flag is set in the UDP model. |
1da177e4 LT |
1896 | */ |
1897 | if ((sctp_style(sk, TCP) && msg_name) || | |
eaa5c54d | 1898 | (sinfo_flags & SCTP_ADDR_OVER)) { |
dce116ae | 1899 | chunk_tp = sctp_assoc_lookup_paddr(asoc, &to); |
1da177e4 LT |
1900 | if (!chunk_tp) { |
1901 | err = -EINVAL; | |
1902 | goto out_free; | |
1903 | } | |
1904 | } else | |
1905 | chunk_tp = NULL; | |
1906 | ||
1907 | /* Auto-connect, if we aren't connected already. */ | |
1908 | if (sctp_state(asoc, CLOSED)) { | |
55e26eb9 | 1909 | err = sctp_primitive_ASSOCIATE(net, asoc, NULL); |
1da177e4 LT |
1910 | if (err < 0) |
1911 | goto out_free; | |
1912 | SCTP_DEBUG_PRINTK("We associated primitively.\n"); | |
1913 | } | |
1914 | ||
1915 | /* Break the message into multiple chunks of maximum size. */ | |
1916 | datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len); | |
6e51fe75 TR |
1917 | if (IS_ERR(datamsg)) { |
1918 | err = PTR_ERR(datamsg); | |
1da177e4 LT |
1919 | goto out_free; |
1920 | } | |
1921 | ||
1922 | /* Now send the (possibly) fragmented message. */ | |
9dbc15f0 | 1923 | list_for_each_entry(chunk, &datamsg->chunks, frag_list) { |
80445cfb | 1924 | sctp_chunk_hold(chunk); |
1da177e4 LT |
1925 | |
1926 | /* Do accounting for the write space. */ | |
1927 | sctp_set_owner_w(chunk); | |
1928 | ||
1929 | chunk->transport = chunk_tp; | |
1da177e4 LT |
1930 | } |
1931 | ||
9c5c62be VY |
1932 | /* Send it to the lower layers. Note: all chunks |
1933 | * must either fail or succeed. The lower layer | |
1934 | * works that way today. Keep it that way or this | |
1935 | * breaks. | |
1936 | */ | |
55e26eb9 | 1937 | err = sctp_primitive_SEND(net, asoc, datamsg); |
9c5c62be VY |
1938 | /* Did the lower layer accept the chunk? */ |
1939 | if (err) | |
1940 | sctp_datamsg_free(datamsg); | |
1941 | else | |
1942 | sctp_datamsg_put(datamsg); | |
1943 | ||
1944 | SCTP_DEBUG_PRINTK("We sent primitively.\n"); | |
1945 | ||
1da177e4 LT |
1946 | if (err) |
1947 | goto out_free; | |
1948 | else | |
1949 | err = msg_len; | |
1950 | ||
1951 | /* If we are already past ASSOCIATE, the lower | |
1952 | * layers are responsible for association cleanup. | |
1953 | */ | |
1954 | goto out_unlock; | |
1955 | ||
1956 | out_free: | |
2eebc1e1 NH |
1957 | if (new_asoc) { |
1958 | sctp_unhash_established(asoc); | |
1da177e4 | 1959 | sctp_association_free(asoc); |
2eebc1e1 | 1960 | } |
1da177e4 LT |
1961 | out_unlock: |
1962 | sctp_release_sock(sk); | |
1963 | ||
1964 | out_nounlock: | |
1965 | return sctp_error(sk, msg_flags, err); | |
1966 | ||
1967 | #if 0 | |
1968 | do_sock_err: | |
1969 | if (msg_len) | |
1970 | err = msg_len; | |
1971 | else | |
1972 | err = sock_error(sk); | |
1973 | goto out; | |
1974 | ||
1975 | do_interrupted: | |
1976 | if (msg_len) | |
1977 | err = msg_len; | |
1978 | goto out; | |
1979 | #endif /* 0 */ | |
1980 | } | |
1981 | ||
1982 | /* This is an extended version of skb_pull() that removes the data from the | |
1983 | * start of a skb even when data is spread across the list of skb's in the | |
1984 | * frag_list. len specifies the total amount of data that needs to be removed. | |
1985 | * when 'len' bytes could be removed from the skb, it returns 0. | |
1986 | * If 'len' exceeds the total skb length, it returns the no. of bytes that | |
1987 | * could not be removed. | |
1988 | */ | |
1989 | static int sctp_skb_pull(struct sk_buff *skb, int len) | |
1990 | { | |
1991 | struct sk_buff *list; | |
1992 | int skb_len = skb_headlen(skb); | |
1993 | int rlen; | |
1994 | ||
1995 | if (len <= skb_len) { | |
1996 | __skb_pull(skb, len); | |
1997 | return 0; | |
1998 | } | |
1999 | len -= skb_len; | |
2000 | __skb_pull(skb, skb_len); | |
2001 | ||
1b003be3 | 2002 | skb_walk_frags(skb, list) { |
1da177e4 LT |
2003 | rlen = sctp_skb_pull(list, len); |
2004 | skb->len -= (len-rlen); | |
2005 | skb->data_len -= (len-rlen); | |
2006 | ||
2007 | if (!rlen) | |
2008 | return 0; | |
2009 | ||
2010 | len = rlen; | |
2011 | } | |
2012 | ||
2013 | return len; | |
2014 | } | |
2015 | ||
2016 | /* API 3.1.3 recvmsg() - UDP Style Syntax | |
2017 | * | |
2018 | * ssize_t recvmsg(int socket, struct msghdr *message, | |
2019 | * int flags); | |
2020 | * | |
2021 | * socket - the socket descriptor of the endpoint. | |
2022 | * message - pointer to the msghdr structure which contains a single | |
2023 | * user message and possibly some ancillary data. | |
2024 | * | |
2025 | * See Section 5 for complete description of the data | |
2026 | * structures. | |
2027 | * | |
2028 | * flags - flags sent or received with the user message, see Section | |
2029 | * 5 for complete description of the flags. | |
2030 | */ | |
2031 | static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *); | |
2032 | ||
dda91928 DB |
2033 | static int sctp_recvmsg(struct kiocb *iocb, struct sock *sk, |
2034 | struct msghdr *msg, size_t len, int noblock, | |
2035 | int flags, int *addr_len) | |
1da177e4 LT |
2036 | { |
2037 | struct sctp_ulpevent *event = NULL; | |
2038 | struct sctp_sock *sp = sctp_sk(sk); | |
2039 | struct sk_buff *skb; | |
2040 | int copied; | |
2041 | int err = 0; | |
2042 | int skb_len; | |
2043 | ||
2044 | SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: " | |
2045 | "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg, | |
2046 | "len", len, "knoblauch", noblock, | |
2047 | "flags", flags, "addr_len", addr_len); | |
2048 | ||
2049 | sctp_lock_sock(sk); | |
2050 | ||
2051 | if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) { | |
2052 | err = -ENOTCONN; | |
2053 | goto out; | |
2054 | } | |
2055 | ||
2056 | skb = sctp_skb_recv_datagram(sk, flags, noblock, &err); | |
2057 | if (!skb) | |
2058 | goto out; | |
2059 | ||
2060 | /* Get the total length of the skb including any skb's in the | |
2061 | * frag_list. | |
2062 | */ | |
2063 | skb_len = skb->len; | |
2064 | ||
2065 | copied = skb_len; | |
2066 | if (copied > len) | |
2067 | copied = len; | |
2068 | ||
2069 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2070 | ||
2071 | event = sctp_skb2event(skb); | |
2072 | ||
2073 | if (err) | |
2074 | goto out_free; | |
2075 | ||
3b885787 | 2076 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
2077 | if (sctp_ulpevent_is_notification(event)) { |
2078 | msg->msg_flags |= MSG_NOTIFICATION; | |
2079 | sp->pf->event_msgname(event, msg->msg_name, addr_len); | |
2080 | } else { | |
2081 | sp->pf->skb_msgname(skb, msg->msg_name, addr_len); | |
2082 | } | |
2083 | ||
2084 | /* Check if we allow SCTP_SNDRCVINFO. */ | |
2085 | if (sp->subscribe.sctp_data_io_event) | |
2086 | sctp_ulpevent_read_sndrcvinfo(event, msg); | |
2087 | #if 0 | |
2088 | /* FIXME: we should be calling IP/IPv6 layers. */ | |
2089 | if (sk->sk_protinfo.af_inet.cmsg_flags) | |
2090 | ip_cmsg_recv(msg, skb); | |
2091 | #endif | |
2092 | ||
2093 | err = copied; | |
2094 | ||
2095 | /* If skb's length exceeds the user's buffer, update the skb and | |
2096 | * push it back to the receive_queue so that the next call to | |
2097 | * recvmsg() will return the remaining data. Don't set MSG_EOR. | |
2098 | */ | |
2099 | if (skb_len > copied) { | |
2100 | msg->msg_flags &= ~MSG_EOR; | |
2101 | if (flags & MSG_PEEK) | |
2102 | goto out_free; | |
2103 | sctp_skb_pull(skb, copied); | |
2104 | skb_queue_head(&sk->sk_receive_queue, skb); | |
2105 | ||
2106 | /* When only partial message is copied to the user, increase | |
2107 | * rwnd by that amount. If all the data in the skb is read, | |
2108 | * rwnd is updated when the event is freed. | |
2109 | */ | |
0eca8fee VY |
2110 | if (!sctp_ulpevent_is_notification(event)) |
2111 | sctp_assoc_rwnd_increase(event->asoc, copied); | |
1da177e4 LT |
2112 | goto out; |
2113 | } else if ((event->msg_flags & MSG_NOTIFICATION) || | |
2114 | (event->msg_flags & MSG_EOR)) | |
2115 | msg->msg_flags |= MSG_EOR; | |
2116 | else | |
2117 | msg->msg_flags &= ~MSG_EOR; | |
2118 | ||
2119 | out_free: | |
2120 | if (flags & MSG_PEEK) { | |
2121 | /* Release the skb reference acquired after peeking the skb in | |
2122 | * sctp_skb_recv_datagram(). | |
2123 | */ | |
2124 | kfree_skb(skb); | |
2125 | } else { | |
2126 | /* Free the event which includes releasing the reference to | |
2127 | * the owner of the skb, freeing the skb and updating the | |
2128 | * rwnd. | |
2129 | */ | |
2130 | sctp_ulpevent_free(event); | |
2131 | } | |
2132 | out: | |
2133 | sctp_release_sock(sk); | |
2134 | return err; | |
2135 | } | |
2136 | ||
2137 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
2138 | * | |
2139 | * This option is a on/off flag. If enabled no SCTP message | |
2140 | * fragmentation will be performed. Instead if a message being sent | |
2141 | * exceeds the current PMTU size, the message will NOT be sent and | |
2142 | * instead a error will be indicated to the user. | |
2143 | */ | |
2144 | static int sctp_setsockopt_disable_fragments(struct sock *sk, | |
b7058842 DM |
2145 | char __user *optval, |
2146 | unsigned int optlen) | |
1da177e4 LT |
2147 | { |
2148 | int val; | |
2149 | ||
2150 | if (optlen < sizeof(int)) | |
2151 | return -EINVAL; | |
2152 | ||
2153 | if (get_user(val, (int __user *)optval)) | |
2154 | return -EFAULT; | |
2155 | ||
2156 | sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1; | |
2157 | ||
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | static int sctp_setsockopt_events(struct sock *sk, char __user *optval, | |
b7058842 | 2162 | unsigned int optlen) |
1da177e4 | 2163 | { |
94912301 WY |
2164 | struct sctp_association *asoc; |
2165 | struct sctp_ulpevent *event; | |
2166 | ||
7e8616d8 | 2167 | if (optlen > sizeof(struct sctp_event_subscribe)) |
1da177e4 LT |
2168 | return -EINVAL; |
2169 | if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen)) | |
2170 | return -EFAULT; | |
94912301 WY |
2171 | |
2172 | /* | |
2173 | * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT, | |
2174 | * if there is no data to be sent or retransmit, the stack will | |
2175 | * immediately send up this notification. | |
2176 | */ | |
2177 | if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT, | |
2178 | &sctp_sk(sk)->subscribe)) { | |
2179 | asoc = sctp_id2assoc(sk, 0); | |
2180 | ||
2181 | if (asoc && sctp_outq_is_empty(&asoc->outqueue)) { | |
2182 | event = sctp_ulpevent_make_sender_dry_event(asoc, | |
2183 | GFP_ATOMIC); | |
2184 | if (!event) | |
2185 | return -ENOMEM; | |
2186 | ||
2187 | sctp_ulpq_tail_event(&asoc->ulpq, event); | |
2188 | } | |
2189 | } | |
2190 | ||
1da177e4 LT |
2191 | return 0; |
2192 | } | |
2193 | ||
2194 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
2195 | * | |
2196 | * This socket option is applicable to the UDP-style socket only. When | |
2197 | * set it will cause associations that are idle for more than the | |
2198 | * specified number of seconds to automatically close. An association | |
2199 | * being idle is defined an association that has NOT sent or received | |
2200 | * user data. The special value of '0' indicates that no automatic | |
2201 | * close of any associations should be performed. The option expects an | |
2202 | * integer defining the number of seconds of idle time before an | |
2203 | * association is closed. | |
2204 | */ | |
2205 | static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval, | |
b7058842 | 2206 | unsigned int optlen) |
1da177e4 LT |
2207 | { |
2208 | struct sctp_sock *sp = sctp_sk(sk); | |
2209 | ||
2210 | /* Applicable to UDP-style socket only */ | |
2211 | if (sctp_style(sk, TCP)) | |
2212 | return -EOPNOTSUPP; | |
2213 | if (optlen != sizeof(int)) | |
2214 | return -EINVAL; | |
2215 | if (copy_from_user(&sp->autoclose, optval, optlen)) | |
2216 | return -EFAULT; | |
2217 | ||
1da177e4 LT |
2218 | return 0; |
2219 | } | |
2220 | ||
2221 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
2222 | * | |
2223 | * Applications can enable or disable heartbeats for any peer address of | |
2224 | * an association, modify an address's heartbeat interval, force a | |
2225 | * heartbeat to be sent immediately, and adjust the address's maximum | |
2226 | * number of retransmissions sent before an address is considered | |
2227 | * unreachable. The following structure is used to access and modify an | |
2228 | * address's parameters: | |
2229 | * | |
2230 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
2231 | * sctp_assoc_t spp_assoc_id; |
2232 | * struct sockaddr_storage spp_address; | |
2233 | * uint32_t spp_hbinterval; | |
2234 | * uint16_t spp_pathmaxrxt; | |
2235 | * uint32_t spp_pathmtu; | |
2236 | * uint32_t spp_sackdelay; | |
2237 | * uint32_t spp_flags; | |
2238 | * }; | |
2239 | * | |
2240 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
2241 | * application, and identifies the association for | |
2242 | * this query. | |
1da177e4 LT |
2243 | * spp_address - This specifies which address is of interest. |
2244 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
2245 | * in milliseconds. If a value of zero |
2246 | * is present in this field then no changes are to | |
2247 | * be made to this parameter. | |
1da177e4 LT |
2248 | * spp_pathmaxrxt - This contains the maximum number of |
2249 | * retransmissions before this address shall be | |
52ccb8e9 FF |
2250 | * considered unreachable. If a value of zero |
2251 | * is present in this field then no changes are to | |
2252 | * be made to this parameter. | |
2253 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
2254 | * specified here will be the "fixed" path mtu. | |
2255 | * Note that if the spp_address field is empty | |
2256 | * then all associations on this address will | |
2257 | * have this fixed path mtu set upon them. | |
2258 | * | |
2259 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
2260 | * the number of milliseconds that sacks will be delayed | |
2261 | * for. This value will apply to all addresses of an | |
2262 | * association if the spp_address field is empty. Note | |
2263 | * also, that if delayed sack is enabled and this | |
2264 | * value is set to 0, no change is made to the last | |
2265 | * recorded delayed sack timer value. | |
2266 | * | |
2267 | * spp_flags - These flags are used to control various features | |
2268 | * on an association. The flag field may contain | |
2269 | * zero or more of the following options. | |
2270 | * | |
2271 | * SPP_HB_ENABLE - Enable heartbeats on the | |
2272 | * specified address. Note that if the address | |
2273 | * field is empty all addresses for the association | |
2274 | * have heartbeats enabled upon them. | |
2275 | * | |
2276 | * SPP_HB_DISABLE - Disable heartbeats on the | |
2277 | * speicifed address. Note that if the address | |
2278 | * field is empty all addresses for the association | |
2279 | * will have their heartbeats disabled. Note also | |
2280 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
2281 | * mutually exclusive, only one of these two should | |
2282 | * be specified. Enabling both fields will have | |
2283 | * undetermined results. | |
2284 | * | |
2285 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
2286 | * to be made immediately. | |
2287 | * | |
bdf3092a VY |
2288 | * SPP_HB_TIME_IS_ZERO - Specify's that the time for |
2289 | * heartbeat delayis to be set to the value of 0 | |
2290 | * milliseconds. | |
2291 | * | |
52ccb8e9 FF |
2292 | * SPP_PMTUD_ENABLE - This field will enable PMTU |
2293 | * discovery upon the specified address. Note that | |
2294 | * if the address feild is empty then all addresses | |
2295 | * on the association are effected. | |
2296 | * | |
2297 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
2298 | * discovery upon the specified address. Note that | |
2299 | * if the address feild is empty then all addresses | |
2300 | * on the association are effected. Not also that | |
2301 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
2302 | * exclusive. Enabling both will have undetermined | |
2303 | * results. | |
2304 | * | |
2305 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
2306 | * on delayed sack. The time specified in spp_sackdelay | |
2307 | * is used to specify the sack delay for this address. Note | |
2308 | * that if spp_address is empty then all addresses will | |
2309 | * enable delayed sack and take on the sack delay | |
2310 | * value specified in spp_sackdelay. | |
2311 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
2312 | * off delayed sack. If the spp_address field is blank then | |
2313 | * delayed sack is disabled for the entire association. Note | |
2314 | * also that this field is mutually exclusive to | |
2315 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
2316 | * results. | |
1da177e4 | 2317 | */ |
16164366 AB |
2318 | static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params, |
2319 | struct sctp_transport *trans, | |
2320 | struct sctp_association *asoc, | |
2321 | struct sctp_sock *sp, | |
2322 | int hb_change, | |
2323 | int pmtud_change, | |
2324 | int sackdelay_change) | |
52ccb8e9 FF |
2325 | { |
2326 | int error; | |
2327 | ||
2328 | if (params->spp_flags & SPP_HB_DEMAND && trans) { | |
55e26eb9 EB |
2329 | struct net *net = sock_net(trans->asoc->base.sk); |
2330 | ||
2331 | error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans); | |
52ccb8e9 FF |
2332 | if (error) |
2333 | return error; | |
2334 | } | |
2335 | ||
bdf3092a VY |
2336 | /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of |
2337 | * this field is ignored. Note also that a value of zero indicates | |
2338 | * the current setting should be left unchanged. | |
2339 | */ | |
2340 | if (params->spp_flags & SPP_HB_ENABLE) { | |
2341 | ||
2342 | /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is | |
2343 | * set. This lets us use 0 value when this flag | |
2344 | * is set. | |
2345 | */ | |
2346 | if (params->spp_flags & SPP_HB_TIME_IS_ZERO) | |
2347 | params->spp_hbinterval = 0; | |
2348 | ||
2349 | if (params->spp_hbinterval || | |
2350 | (params->spp_flags & SPP_HB_TIME_IS_ZERO)) { | |
2351 | if (trans) { | |
2352 | trans->hbinterval = | |
2353 | msecs_to_jiffies(params->spp_hbinterval); | |
2354 | } else if (asoc) { | |
2355 | asoc->hbinterval = | |
2356 | msecs_to_jiffies(params->spp_hbinterval); | |
2357 | } else { | |
2358 | sp->hbinterval = params->spp_hbinterval; | |
2359 | } | |
52ccb8e9 FF |
2360 | } |
2361 | } | |
2362 | ||
2363 | if (hb_change) { | |
2364 | if (trans) { | |
2365 | trans->param_flags = | |
2366 | (trans->param_flags & ~SPP_HB) | hb_change; | |
2367 | } else if (asoc) { | |
2368 | asoc->param_flags = | |
2369 | (asoc->param_flags & ~SPP_HB) | hb_change; | |
2370 | } else { | |
2371 | sp->param_flags = | |
2372 | (sp->param_flags & ~SPP_HB) | hb_change; | |
2373 | } | |
2374 | } | |
2375 | ||
bdf3092a VY |
2376 | /* When Path MTU discovery is disabled the value specified here will |
2377 | * be the "fixed" path mtu (i.e. the value of the spp_flags field must | |
2378 | * include the flag SPP_PMTUD_DISABLE for this field to have any | |
2379 | * effect). | |
2380 | */ | |
2381 | if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) { | |
52ccb8e9 FF |
2382 | if (trans) { |
2383 | trans->pathmtu = params->spp_pathmtu; | |
02f3d4ce | 2384 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2385 | } else if (asoc) { |
2386 | asoc->pathmtu = params->spp_pathmtu; | |
f68b2e05 | 2387 | sctp_frag_point(asoc, params->spp_pathmtu); |
52ccb8e9 FF |
2388 | } else { |
2389 | sp->pathmtu = params->spp_pathmtu; | |
2390 | } | |
2391 | } | |
2392 | ||
2393 | if (pmtud_change) { | |
2394 | if (trans) { | |
2395 | int update = (trans->param_flags & SPP_PMTUD_DISABLE) && | |
2396 | (params->spp_flags & SPP_PMTUD_ENABLE); | |
2397 | trans->param_flags = | |
2398 | (trans->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2399 | if (update) { | |
9914ae3c | 2400 | sctp_transport_pmtu(trans, sctp_opt2sk(sp)); |
02f3d4ce | 2401 | sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc); |
52ccb8e9 FF |
2402 | } |
2403 | } else if (asoc) { | |
2404 | asoc->param_flags = | |
2405 | (asoc->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2406 | } else { | |
2407 | sp->param_flags = | |
2408 | (sp->param_flags & ~SPP_PMTUD) | pmtud_change; | |
2409 | } | |
2410 | } | |
2411 | ||
bdf3092a VY |
2412 | /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the |
2413 | * value of this field is ignored. Note also that a value of zero | |
2414 | * indicates the current setting should be left unchanged. | |
2415 | */ | |
2416 | if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) { | |
52ccb8e9 FF |
2417 | if (trans) { |
2418 | trans->sackdelay = | |
2419 | msecs_to_jiffies(params->spp_sackdelay); | |
2420 | } else if (asoc) { | |
2421 | asoc->sackdelay = | |
2422 | msecs_to_jiffies(params->spp_sackdelay); | |
2423 | } else { | |
2424 | sp->sackdelay = params->spp_sackdelay; | |
2425 | } | |
2426 | } | |
2427 | ||
2428 | if (sackdelay_change) { | |
2429 | if (trans) { | |
2430 | trans->param_flags = | |
2431 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2432 | sackdelay_change; | |
2433 | } else if (asoc) { | |
2434 | asoc->param_flags = | |
2435 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2436 | sackdelay_change; | |
2437 | } else { | |
2438 | sp->param_flags = | |
2439 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2440 | sackdelay_change; | |
2441 | } | |
2442 | } | |
2443 | ||
37051f73 APO |
2444 | /* Note that a value of zero indicates the current setting should be |
2445 | left unchanged. | |
bdf3092a | 2446 | */ |
37051f73 | 2447 | if (params->spp_pathmaxrxt) { |
52ccb8e9 FF |
2448 | if (trans) { |
2449 | trans->pathmaxrxt = params->spp_pathmaxrxt; | |
2450 | } else if (asoc) { | |
2451 | asoc->pathmaxrxt = params->spp_pathmaxrxt; | |
2452 | } else { | |
2453 | sp->pathmaxrxt = params->spp_pathmaxrxt; | |
2454 | } | |
2455 | } | |
2456 | ||
2457 | return 0; | |
2458 | } | |
2459 | ||
1da177e4 | 2460 | static int sctp_setsockopt_peer_addr_params(struct sock *sk, |
b7058842 DM |
2461 | char __user *optval, |
2462 | unsigned int optlen) | |
1da177e4 | 2463 | { |
52ccb8e9 FF |
2464 | struct sctp_paddrparams params; |
2465 | struct sctp_transport *trans = NULL; | |
2466 | struct sctp_association *asoc = NULL; | |
2467 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 2468 | int error; |
52ccb8e9 | 2469 | int hb_change, pmtud_change, sackdelay_change; |
1da177e4 LT |
2470 | |
2471 | if (optlen != sizeof(struct sctp_paddrparams)) | |
52ccb8e9 FF |
2472 | return - EINVAL; |
2473 | ||
1da177e4 LT |
2474 | if (copy_from_user(¶ms, optval, optlen)) |
2475 | return -EFAULT; | |
2476 | ||
52ccb8e9 FF |
2477 | /* Validate flags and value parameters. */ |
2478 | hb_change = params.spp_flags & SPP_HB; | |
2479 | pmtud_change = params.spp_flags & SPP_PMTUD; | |
2480 | sackdelay_change = params.spp_flags & SPP_SACKDELAY; | |
2481 | ||
2482 | if (hb_change == SPP_HB || | |
2483 | pmtud_change == SPP_PMTUD || | |
2484 | sackdelay_change == SPP_SACKDELAY || | |
2485 | params.spp_sackdelay > 500 || | |
f64f9e71 JP |
2486 | (params.spp_pathmtu && |
2487 | params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT)) | |
52ccb8e9 | 2488 | return -EINVAL; |
1da177e4 | 2489 | |
52ccb8e9 FF |
2490 | /* If an address other than INADDR_ANY is specified, and |
2491 | * no transport is found, then the request is invalid. | |
2492 | */ | |
52cae8f0 | 2493 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
2494 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
2495 | params.spp_assoc_id); | |
2496 | if (!trans) | |
1da177e4 | 2497 | return -EINVAL; |
1da177e4 LT |
2498 | } |
2499 | ||
52ccb8e9 FF |
2500 | /* Get association, if assoc_id != 0 and the socket is a one |
2501 | * to many style socket, and an association was not found, then | |
2502 | * the id was invalid. | |
2503 | */ | |
2504 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
2505 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) | |
1da177e4 LT |
2506 | return -EINVAL; |
2507 | ||
52ccb8e9 FF |
2508 | /* Heartbeat demand can only be sent on a transport or |
2509 | * association, but not a socket. | |
1da177e4 | 2510 | */ |
52ccb8e9 FF |
2511 | if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc) |
2512 | return -EINVAL; | |
2513 | ||
2514 | /* Process parameters. */ | |
2515 | error = sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, | |
2516 | hb_change, pmtud_change, | |
2517 | sackdelay_change); | |
1da177e4 | 2518 | |
52ccb8e9 FF |
2519 | if (error) |
2520 | return error; | |
2521 | ||
2522 | /* If changes are for association, also apply parameters to each | |
2523 | * transport. | |
1da177e4 | 2524 | */ |
52ccb8e9 | 2525 | if (!trans && asoc) { |
9dbc15f0 RD |
2526 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2527 | transports) { | |
52ccb8e9 FF |
2528 | sctp_apply_peer_addr_params(¶ms, trans, asoc, sp, |
2529 | hb_change, pmtud_change, | |
2530 | sackdelay_change); | |
2531 | } | |
2532 | } | |
1da177e4 LT |
2533 | |
2534 | return 0; | |
2535 | } | |
2536 | ||
d364d927 WY |
2537 | /* |
2538 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
2539 | * | |
2540 | * This option will effect the way delayed acks are performed. This | |
2541 | * option allows you to get or set the delayed ack time, in | |
2542 | * milliseconds. It also allows changing the delayed ack frequency. | |
2543 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
2544 | * the assoc_id is 0, then this sets or gets the endpoints default | |
2545 | * values. If the assoc_id field is non-zero, then the set or get | |
2546 | * effects the specified association for the one to many model (the | |
2547 | * assoc_id field is ignored by the one to one model). Note that if | |
2548 | * sack_delay or sack_freq are 0 when setting this option, then the | |
2549 | * current values will remain unchanged. | |
2550 | * | |
2551 | * struct sctp_sack_info { | |
2552 | * sctp_assoc_t sack_assoc_id; | |
2553 | * uint32_t sack_delay; | |
2554 | * uint32_t sack_freq; | |
2555 | * }; | |
2556 | * | |
2557 | * sack_assoc_id - This parameter, indicates which association the user | |
2558 | * is performing an action upon. Note that if this field's value is | |
2559 | * zero then the endpoints default value is changed (effecting future | |
2560 | * associations only). | |
2561 | * | |
2562 | * sack_delay - This parameter contains the number of milliseconds that | |
2563 | * the user is requesting the delayed ACK timer be set to. Note that | |
2564 | * this value is defined in the standard to be between 200 and 500 | |
2565 | * milliseconds. | |
2566 | * | |
2567 | * sack_freq - This parameter contains the number of packets that must | |
2568 | * be received before a sack is sent without waiting for the delay | |
2569 | * timer to expire. The default value for this is 2, setting this | |
2570 | * value to 1 will disable the delayed sack algorithm. | |
7708610b FF |
2571 | */ |
2572 | ||
d364d927 | 2573 | static int sctp_setsockopt_delayed_ack(struct sock *sk, |
b7058842 | 2574 | char __user *optval, unsigned int optlen) |
7708610b | 2575 | { |
d364d927 | 2576 | struct sctp_sack_info params; |
7708610b FF |
2577 | struct sctp_transport *trans = NULL; |
2578 | struct sctp_association *asoc = NULL; | |
2579 | struct sctp_sock *sp = sctp_sk(sk); | |
2580 | ||
d364d927 WY |
2581 | if (optlen == sizeof(struct sctp_sack_info)) { |
2582 | if (copy_from_user(¶ms, optval, optlen)) | |
2583 | return -EFAULT; | |
7708610b | 2584 | |
d364d927 WY |
2585 | if (params.sack_delay == 0 && params.sack_freq == 0) |
2586 | return 0; | |
2587 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
2588 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
2589 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
2590 | if (copy_from_user(¶ms, optval, optlen)) |
2591 | return -EFAULT; | |
2592 | ||
2593 | if (params.sack_delay == 0) | |
2594 | params.sack_freq = 1; | |
2595 | else | |
2596 | params.sack_freq = 0; | |
2597 | } else | |
2598 | return - EINVAL; | |
7708610b FF |
2599 | |
2600 | /* Validate value parameter. */ | |
d364d927 | 2601 | if (params.sack_delay > 500) |
7708610b FF |
2602 | return -EINVAL; |
2603 | ||
d364d927 | 2604 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
2605 | * to many style socket, and an association was not found, then |
2606 | * the id was invalid. | |
d808ad9a | 2607 | */ |
d364d927 WY |
2608 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
2609 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
2610 | return -EINVAL; |
2611 | ||
d364d927 | 2612 | if (params.sack_delay) { |
7708610b FF |
2613 | if (asoc) { |
2614 | asoc->sackdelay = | |
d364d927 | 2615 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2616 | asoc->param_flags = |
7708610b FF |
2617 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2618 | SPP_SACKDELAY_ENABLE; | |
2619 | } else { | |
d364d927 | 2620 | sp->sackdelay = params.sack_delay; |
d808ad9a | 2621 | sp->param_flags = |
7708610b FF |
2622 | (sp->param_flags & ~SPP_SACKDELAY) | |
2623 | SPP_SACKDELAY_ENABLE; | |
2624 | } | |
d364d927 WY |
2625 | } |
2626 | ||
2627 | if (params.sack_freq == 1) { | |
7708610b | 2628 | if (asoc) { |
d808ad9a | 2629 | asoc->param_flags = |
7708610b FF |
2630 | (asoc->param_flags & ~SPP_SACKDELAY) | |
2631 | SPP_SACKDELAY_DISABLE; | |
2632 | } else { | |
d808ad9a | 2633 | sp->param_flags = |
7708610b FF |
2634 | (sp->param_flags & ~SPP_SACKDELAY) | |
2635 | SPP_SACKDELAY_DISABLE; | |
2636 | } | |
d364d927 WY |
2637 | } else if (params.sack_freq > 1) { |
2638 | if (asoc) { | |
2639 | asoc->sackfreq = params.sack_freq; | |
2640 | asoc->param_flags = | |
2641 | (asoc->param_flags & ~SPP_SACKDELAY) | | |
2642 | SPP_SACKDELAY_ENABLE; | |
2643 | } else { | |
2644 | sp->sackfreq = params.sack_freq; | |
2645 | sp->param_flags = | |
2646 | (sp->param_flags & ~SPP_SACKDELAY) | | |
2647 | SPP_SACKDELAY_ENABLE; | |
2648 | } | |
7708610b FF |
2649 | } |
2650 | ||
2651 | /* If change is for association, also apply to each transport. */ | |
2652 | if (asoc) { | |
9dbc15f0 RD |
2653 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, |
2654 | transports) { | |
d364d927 | 2655 | if (params.sack_delay) { |
7708610b | 2656 | trans->sackdelay = |
d364d927 | 2657 | msecs_to_jiffies(params.sack_delay); |
d808ad9a | 2658 | trans->param_flags = |
7708610b FF |
2659 | (trans->param_flags & ~SPP_SACKDELAY) | |
2660 | SPP_SACKDELAY_ENABLE; | |
d364d927 | 2661 | } |
7bfe8bdb | 2662 | if (params.sack_freq == 1) { |
d808ad9a | 2663 | trans->param_flags = |
7708610b FF |
2664 | (trans->param_flags & ~SPP_SACKDELAY) | |
2665 | SPP_SACKDELAY_DISABLE; | |
d364d927 WY |
2666 | } else if (params.sack_freq > 1) { |
2667 | trans->sackfreq = params.sack_freq; | |
2668 | trans->param_flags = | |
2669 | (trans->param_flags & ~SPP_SACKDELAY) | | |
2670 | SPP_SACKDELAY_ENABLE; | |
7708610b FF |
2671 | } |
2672 | } | |
2673 | } | |
d808ad9a | 2674 | |
7708610b FF |
2675 | return 0; |
2676 | } | |
2677 | ||
1da177e4 LT |
2678 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
2679 | * | |
2680 | * Applications can specify protocol parameters for the default association | |
2681 | * initialization. The option name argument to setsockopt() and getsockopt() | |
2682 | * is SCTP_INITMSG. | |
2683 | * | |
2684 | * Setting initialization parameters is effective only on an unconnected | |
2685 | * socket (for UDP-style sockets only future associations are effected | |
2686 | * by the change). With TCP-style sockets, this option is inherited by | |
2687 | * sockets derived from a listener socket. | |
2688 | */ | |
b7058842 | 2689 | static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2690 | { |
2691 | struct sctp_initmsg sinit; | |
2692 | struct sctp_sock *sp = sctp_sk(sk); | |
2693 | ||
2694 | if (optlen != sizeof(struct sctp_initmsg)) | |
2695 | return -EINVAL; | |
2696 | if (copy_from_user(&sinit, optval, optlen)) | |
2697 | return -EFAULT; | |
2698 | ||
2699 | if (sinit.sinit_num_ostreams) | |
d808ad9a | 2700 | sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams; |
1da177e4 | 2701 | if (sinit.sinit_max_instreams) |
d808ad9a | 2702 | sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams; |
1da177e4 | 2703 | if (sinit.sinit_max_attempts) |
d808ad9a | 2704 | sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts; |
1da177e4 | 2705 | if (sinit.sinit_max_init_timeo) |
d808ad9a | 2706 | sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo; |
1da177e4 LT |
2707 | |
2708 | return 0; | |
2709 | } | |
2710 | ||
2711 | /* | |
2712 | * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM) | |
2713 | * | |
2714 | * Applications that wish to use the sendto() system call may wish to | |
2715 | * specify a default set of parameters that would normally be supplied | |
2716 | * through the inclusion of ancillary data. This socket option allows | |
2717 | * such an application to set the default sctp_sndrcvinfo structure. | |
2718 | * The application that wishes to use this socket option simply passes | |
2719 | * in to this call the sctp_sndrcvinfo structure defined in Section | |
2720 | * 5.2.2) The input parameters accepted by this call include | |
2721 | * sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context, | |
2722 | * sinfo_timetolive. The user must provide the sinfo_assoc_id field in | |
2723 | * to this call if the caller is using the UDP model. | |
2724 | */ | |
2725 | static int sctp_setsockopt_default_send_param(struct sock *sk, | |
b7058842 DM |
2726 | char __user *optval, |
2727 | unsigned int optlen) | |
1da177e4 LT |
2728 | { |
2729 | struct sctp_sndrcvinfo info; | |
2730 | struct sctp_association *asoc; | |
2731 | struct sctp_sock *sp = sctp_sk(sk); | |
2732 | ||
2733 | if (optlen != sizeof(struct sctp_sndrcvinfo)) | |
2734 | return -EINVAL; | |
2735 | if (copy_from_user(&info, optval, optlen)) | |
2736 | return -EFAULT; | |
2737 | ||
2738 | asoc = sctp_id2assoc(sk, info.sinfo_assoc_id); | |
2739 | if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP)) | |
2740 | return -EINVAL; | |
2741 | ||
2742 | if (asoc) { | |
2743 | asoc->default_stream = info.sinfo_stream; | |
2744 | asoc->default_flags = info.sinfo_flags; | |
2745 | asoc->default_ppid = info.sinfo_ppid; | |
2746 | asoc->default_context = info.sinfo_context; | |
2747 | asoc->default_timetolive = info.sinfo_timetolive; | |
2748 | } else { | |
2749 | sp->default_stream = info.sinfo_stream; | |
2750 | sp->default_flags = info.sinfo_flags; | |
2751 | sp->default_ppid = info.sinfo_ppid; | |
2752 | sp->default_context = info.sinfo_context; | |
2753 | sp->default_timetolive = info.sinfo_timetolive; | |
2754 | } | |
2755 | ||
2756 | return 0; | |
2757 | } | |
2758 | ||
2759 | /* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR) | |
2760 | * | |
2761 | * Requests that the local SCTP stack use the enclosed peer address as | |
2762 | * the association primary. The enclosed address must be one of the | |
2763 | * association peer's addresses. | |
2764 | */ | |
2765 | static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 2766 | unsigned int optlen) |
1da177e4 LT |
2767 | { |
2768 | struct sctp_prim prim; | |
2769 | struct sctp_transport *trans; | |
2770 | ||
2771 | if (optlen != sizeof(struct sctp_prim)) | |
2772 | return -EINVAL; | |
2773 | ||
2774 | if (copy_from_user(&prim, optval, sizeof(struct sctp_prim))) | |
2775 | return -EFAULT; | |
2776 | ||
2777 | trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id); | |
2778 | if (!trans) | |
2779 | return -EINVAL; | |
2780 | ||
2781 | sctp_assoc_set_primary(trans->asoc, trans); | |
2782 | ||
2783 | return 0; | |
2784 | } | |
2785 | ||
2786 | /* | |
2787 | * 7.1.5 SCTP_NODELAY | |
2788 | * | |
2789 | * Turn on/off any Nagle-like algorithm. This means that packets are | |
2790 | * generally sent as soon as possible and no unnecessary delays are | |
2791 | * introduced, at the cost of more packets in the network. Expects an | |
2792 | * integer boolean flag. | |
2793 | */ | |
2794 | static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval, | |
b7058842 | 2795 | unsigned int optlen) |
1da177e4 LT |
2796 | { |
2797 | int val; | |
2798 | ||
2799 | if (optlen < sizeof(int)) | |
2800 | return -EINVAL; | |
2801 | if (get_user(val, (int __user *)optval)) | |
2802 | return -EFAULT; | |
2803 | ||
2804 | sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1; | |
2805 | return 0; | |
2806 | } | |
2807 | ||
2808 | /* | |
2809 | * | |
2810 | * 7.1.1 SCTP_RTOINFO | |
2811 | * | |
2812 | * The protocol parameters used to initialize and bound retransmission | |
2813 | * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access | |
2814 | * and modify these parameters. | |
2815 | * All parameters are time values, in milliseconds. A value of 0, when | |
2816 | * modifying the parameters, indicates that the current value should not | |
2817 | * be changed. | |
2818 | * | |
2819 | */ | |
b7058842 DM |
2820 | static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen) |
2821 | { | |
1da177e4 LT |
2822 | struct sctp_rtoinfo rtoinfo; |
2823 | struct sctp_association *asoc; | |
2824 | ||
2825 | if (optlen != sizeof (struct sctp_rtoinfo)) | |
2826 | return -EINVAL; | |
2827 | ||
2828 | if (copy_from_user(&rtoinfo, optval, optlen)) | |
2829 | return -EFAULT; | |
2830 | ||
2831 | asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id); | |
2832 | ||
2833 | /* Set the values to the specific association */ | |
2834 | if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP)) | |
2835 | return -EINVAL; | |
2836 | ||
2837 | if (asoc) { | |
2838 | if (rtoinfo.srto_initial != 0) | |
d808ad9a | 2839 | asoc->rto_initial = |
1da177e4 LT |
2840 | msecs_to_jiffies(rtoinfo.srto_initial); |
2841 | if (rtoinfo.srto_max != 0) | |
2842 | asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max); | |
2843 | if (rtoinfo.srto_min != 0) | |
2844 | asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min); | |
2845 | } else { | |
2846 | /* If there is no association or the association-id = 0 | |
2847 | * set the values to the endpoint. | |
2848 | */ | |
2849 | struct sctp_sock *sp = sctp_sk(sk); | |
2850 | ||
2851 | if (rtoinfo.srto_initial != 0) | |
2852 | sp->rtoinfo.srto_initial = rtoinfo.srto_initial; | |
2853 | if (rtoinfo.srto_max != 0) | |
2854 | sp->rtoinfo.srto_max = rtoinfo.srto_max; | |
2855 | if (rtoinfo.srto_min != 0) | |
2856 | sp->rtoinfo.srto_min = rtoinfo.srto_min; | |
2857 | } | |
2858 | ||
2859 | return 0; | |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * | |
2864 | * 7.1.2 SCTP_ASSOCINFO | |
2865 | * | |
59c51591 | 2866 | * This option is used to tune the maximum retransmission attempts |
1da177e4 LT |
2867 | * of the association. |
2868 | * Returns an error if the new association retransmission value is | |
2869 | * greater than the sum of the retransmission value of the peer. | |
2870 | * See [SCTP] for more information. | |
2871 | * | |
2872 | */ | |
b7058842 | 2873 | static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2874 | { |
2875 | ||
2876 | struct sctp_assocparams assocparams; | |
2877 | struct sctp_association *asoc; | |
2878 | ||
2879 | if (optlen != sizeof(struct sctp_assocparams)) | |
2880 | return -EINVAL; | |
2881 | if (copy_from_user(&assocparams, optval, optlen)) | |
2882 | return -EFAULT; | |
2883 | ||
2884 | asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id); | |
2885 | ||
2886 | if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP)) | |
2887 | return -EINVAL; | |
2888 | ||
2889 | /* Set the values to the specific association */ | |
2890 | if (asoc) { | |
402d68c4 VY |
2891 | if (assocparams.sasoc_asocmaxrxt != 0) { |
2892 | __u32 path_sum = 0; | |
2893 | int paths = 0; | |
402d68c4 VY |
2894 | struct sctp_transport *peer_addr; |
2895 | ||
9dbc15f0 RD |
2896 | list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list, |
2897 | transports) { | |
402d68c4 VY |
2898 | path_sum += peer_addr->pathmaxrxt; |
2899 | paths++; | |
2900 | } | |
2901 | ||
025dfdaf | 2902 | /* Only validate asocmaxrxt if we have more than |
402d68c4 VY |
2903 | * one path/transport. We do this because path |
2904 | * retransmissions are only counted when we have more | |
2905 | * then one path. | |
2906 | */ | |
2907 | if (paths > 1 && | |
2908 | assocparams.sasoc_asocmaxrxt > path_sum) | |
2909 | return -EINVAL; | |
2910 | ||
1da177e4 | 2911 | asoc->max_retrans = assocparams.sasoc_asocmaxrxt; |
402d68c4 VY |
2912 | } |
2913 | ||
52db882f DB |
2914 | if (assocparams.sasoc_cookie_life != 0) |
2915 | asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life); | |
1da177e4 LT |
2916 | } else { |
2917 | /* Set the values to the endpoint */ | |
2918 | struct sctp_sock *sp = sctp_sk(sk); | |
2919 | ||
2920 | if (assocparams.sasoc_asocmaxrxt != 0) | |
2921 | sp->assocparams.sasoc_asocmaxrxt = | |
2922 | assocparams.sasoc_asocmaxrxt; | |
2923 | if (assocparams.sasoc_cookie_life != 0) | |
2924 | sp->assocparams.sasoc_cookie_life = | |
2925 | assocparams.sasoc_cookie_life; | |
2926 | } | |
2927 | return 0; | |
2928 | } | |
2929 | ||
2930 | /* | |
2931 | * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR) | |
2932 | * | |
2933 | * This socket option is a boolean flag which turns on or off mapped V4 | |
2934 | * addresses. If this option is turned on and the socket is type | |
2935 | * PF_INET6, then IPv4 addresses will be mapped to V6 representation. | |
2936 | * If this option is turned off, then no mapping will be done of V4 | |
2937 | * addresses and a user will receive both PF_INET6 and PF_INET type | |
2938 | * addresses on the socket. | |
2939 | */ | |
b7058842 | 2940 | static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2941 | { |
2942 | int val; | |
2943 | struct sctp_sock *sp = sctp_sk(sk); | |
2944 | ||
2945 | if (optlen < sizeof(int)) | |
2946 | return -EINVAL; | |
2947 | if (get_user(val, (int __user *)optval)) | |
2948 | return -EFAULT; | |
2949 | if (val) | |
2950 | sp->v4mapped = 1; | |
2951 | else | |
2952 | sp->v4mapped = 0; | |
2953 | ||
2954 | return 0; | |
2955 | } | |
2956 | ||
2957 | /* | |
e89c2095 WY |
2958 | * 8.1.16. Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG) |
2959 | * This option will get or set the maximum size to put in any outgoing | |
2960 | * SCTP DATA chunk. If a message is larger than this size it will be | |
1da177e4 LT |
2961 | * fragmented by SCTP into the specified size. Note that the underlying |
2962 | * SCTP implementation may fragment into smaller sized chunks when the | |
2963 | * PMTU of the underlying association is smaller than the value set by | |
e89c2095 WY |
2964 | * the user. The default value for this option is '0' which indicates |
2965 | * the user is NOT limiting fragmentation and only the PMTU will effect | |
2966 | * SCTP's choice of DATA chunk size. Note also that values set larger | |
2967 | * than the maximum size of an IP datagram will effectively let SCTP | |
2968 | * control fragmentation (i.e. the same as setting this option to 0). | |
2969 | * | |
2970 | * The following structure is used to access and modify this parameter: | |
2971 | * | |
2972 | * struct sctp_assoc_value { | |
2973 | * sctp_assoc_t assoc_id; | |
2974 | * uint32_t assoc_value; | |
2975 | * }; | |
2976 | * | |
2977 | * assoc_id: This parameter is ignored for one-to-one style sockets. | |
2978 | * For one-to-many style sockets this parameter indicates which | |
2979 | * association the user is performing an action upon. Note that if | |
2980 | * this field's value is zero then the endpoints default value is | |
2981 | * changed (effecting future associations only). | |
2982 | * assoc_value: This parameter specifies the maximum size in bytes. | |
1da177e4 | 2983 | */ |
b7058842 | 2984 | static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen) |
1da177e4 | 2985 | { |
e89c2095 | 2986 | struct sctp_assoc_value params; |
1da177e4 | 2987 | struct sctp_association *asoc; |
1da177e4 LT |
2988 | struct sctp_sock *sp = sctp_sk(sk); |
2989 | int val; | |
2990 | ||
e89c2095 | 2991 | if (optlen == sizeof(int)) { |
145ce502 JP |
2992 | pr_warn("Use of int in maxseg socket option deprecated\n"); |
2993 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
e89c2095 WY |
2994 | if (copy_from_user(&val, optval, optlen)) |
2995 | return -EFAULT; | |
2996 | params.assoc_id = 0; | |
2997 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
2998 | if (copy_from_user(¶ms, optval, optlen)) | |
2999 | return -EFAULT; | |
3000 | val = params.assoc_value; | |
3001 | } else | |
1da177e4 | 3002 | return -EINVAL; |
e89c2095 | 3003 | |
96a33998 | 3004 | if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN))) |
1da177e4 | 3005 | return -EINVAL; |
1da177e4 | 3006 | |
e89c2095 WY |
3007 | asoc = sctp_id2assoc(sk, params.assoc_id); |
3008 | if (!asoc && params.assoc_id && sctp_style(sk, UDP)) | |
3009 | return -EINVAL; | |
3010 | ||
3011 | if (asoc) { | |
3012 | if (val == 0) { | |
3013 | val = asoc->pathmtu; | |
3014 | val -= sp->pf->af->net_header_len; | |
3015 | val -= sizeof(struct sctphdr) + | |
3016 | sizeof(struct sctp_data_chunk); | |
3017 | } | |
f68b2e05 VY |
3018 | asoc->user_frag = val; |
3019 | asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu); | |
e89c2095 WY |
3020 | } else { |
3021 | sp->user_frag = val; | |
1da177e4 LT |
3022 | } |
3023 | ||
3024 | return 0; | |
3025 | } | |
3026 | ||
3027 | ||
3028 | /* | |
3029 | * 7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR) | |
3030 | * | |
3031 | * Requests that the peer mark the enclosed address as the association | |
3032 | * primary. The enclosed address must be one of the association's | |
3033 | * locally bound addresses. The following structure is used to make a | |
3034 | * set primary request: | |
3035 | */ | |
3036 | static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval, | |
b7058842 | 3037 | unsigned int optlen) |
1da177e4 | 3038 | { |
e1fc3b14 | 3039 | struct net *net = sock_net(sk); |
1da177e4 | 3040 | struct sctp_sock *sp; |
1da177e4 LT |
3041 | struct sctp_association *asoc = NULL; |
3042 | struct sctp_setpeerprim prim; | |
3043 | struct sctp_chunk *chunk; | |
40a01039 | 3044 | struct sctp_af *af; |
1da177e4 LT |
3045 | int err; |
3046 | ||
3047 | sp = sctp_sk(sk); | |
1da177e4 | 3048 | |
e1fc3b14 | 3049 | if (!net->sctp.addip_enable) |
1da177e4 LT |
3050 | return -EPERM; |
3051 | ||
3052 | if (optlen != sizeof(struct sctp_setpeerprim)) | |
3053 | return -EINVAL; | |
3054 | ||
3055 | if (copy_from_user(&prim, optval, optlen)) | |
3056 | return -EFAULT; | |
3057 | ||
3058 | asoc = sctp_id2assoc(sk, prim.sspp_assoc_id); | |
d808ad9a | 3059 | if (!asoc) |
1da177e4 LT |
3060 | return -EINVAL; |
3061 | ||
3062 | if (!asoc->peer.asconf_capable) | |
3063 | return -EPERM; | |
3064 | ||
3065 | if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY) | |
3066 | return -EPERM; | |
3067 | ||
3068 | if (!sctp_state(asoc, ESTABLISHED)) | |
3069 | return -ENOTCONN; | |
3070 | ||
40a01039 WY |
3071 | af = sctp_get_af_specific(prim.sspp_addr.ss_family); |
3072 | if (!af) | |
3073 | return -EINVAL; | |
3074 | ||
3075 | if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL)) | |
3076 | return -EADDRNOTAVAIL; | |
3077 | ||
1da177e4 LT |
3078 | if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr)) |
3079 | return -EADDRNOTAVAIL; | |
3080 | ||
3081 | /* Create an ASCONF chunk with SET_PRIMARY parameter */ | |
3082 | chunk = sctp_make_asconf_set_prim(asoc, | |
3083 | (union sctp_addr *)&prim.sspp_addr); | |
3084 | if (!chunk) | |
3085 | return -ENOMEM; | |
3086 | ||
3087 | err = sctp_send_asconf(asoc, chunk); | |
3088 | ||
3089 | SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n"); | |
3090 | ||
3091 | return err; | |
3092 | } | |
3093 | ||
0f3fffd8 | 3094 | static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval, |
b7058842 | 3095 | unsigned int optlen) |
1da177e4 | 3096 | { |
0f3fffd8 | 3097 | struct sctp_setadaptation adaptation; |
1da177e4 | 3098 | |
0f3fffd8 | 3099 | if (optlen != sizeof(struct sctp_setadaptation)) |
1da177e4 | 3100 | return -EINVAL; |
0f3fffd8 | 3101 | if (copy_from_user(&adaptation, optval, optlen)) |
1da177e4 LT |
3102 | return -EFAULT; |
3103 | ||
0f3fffd8 | 3104 | sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind; |
1da177e4 LT |
3105 | |
3106 | return 0; | |
3107 | } | |
3108 | ||
6ab792f5 ISJ |
3109 | /* |
3110 | * 7.1.29. Set or Get the default context (SCTP_CONTEXT) | |
3111 | * | |
3112 | * The context field in the sctp_sndrcvinfo structure is normally only | |
3113 | * used when a failed message is retrieved holding the value that was | |
3114 | * sent down on the actual send call. This option allows the setting of | |
3115 | * a default context on an association basis that will be received on | |
3116 | * reading messages from the peer. This is especially helpful in the | |
3117 | * one-2-many model for an application to keep some reference to an | |
3118 | * internal state machine that is processing messages on the | |
3119 | * association. Note that the setting of this value only effects | |
3120 | * received messages from the peer and does not effect the value that is | |
3121 | * saved with outbound messages. | |
3122 | */ | |
3123 | static int sctp_setsockopt_context(struct sock *sk, char __user *optval, | |
b7058842 | 3124 | unsigned int optlen) |
6ab792f5 ISJ |
3125 | { |
3126 | struct sctp_assoc_value params; | |
3127 | struct sctp_sock *sp; | |
3128 | struct sctp_association *asoc; | |
3129 | ||
3130 | if (optlen != sizeof(struct sctp_assoc_value)) | |
3131 | return -EINVAL; | |
3132 | if (copy_from_user(¶ms, optval, optlen)) | |
3133 | return -EFAULT; | |
3134 | ||
3135 | sp = sctp_sk(sk); | |
3136 | ||
3137 | if (params.assoc_id != 0) { | |
3138 | asoc = sctp_id2assoc(sk, params.assoc_id); | |
3139 | if (!asoc) | |
3140 | return -EINVAL; | |
3141 | asoc->default_rcv_context = params.assoc_value; | |
3142 | } else { | |
3143 | sp->default_rcv_context = params.assoc_value; | |
3144 | } | |
3145 | ||
3146 | return 0; | |
3147 | } | |
3148 | ||
b6e1331f VY |
3149 | /* |
3150 | * 7.1.24. Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE) | |
3151 | * | |
3152 | * This options will at a minimum specify if the implementation is doing | |
3153 | * fragmented interleave. Fragmented interleave, for a one to many | |
3154 | * socket, is when subsequent calls to receive a message may return | |
3155 | * parts of messages from different associations. Some implementations | |
3156 | * may allow you to turn this value on or off. If so, when turned off, | |
3157 | * no fragment interleave will occur (which will cause a head of line | |
3158 | * blocking amongst multiple associations sharing the same one to many | |
3159 | * socket). When this option is turned on, then each receive call may | |
3160 | * come from a different association (thus the user must receive data | |
3161 | * with the extended calls (e.g. sctp_recvmsg) to keep track of which | |
3162 | * association each receive belongs to. | |
3163 | * | |
3164 | * This option takes a boolean value. A non-zero value indicates that | |
3165 | * fragmented interleave is on. A value of zero indicates that | |
3166 | * fragmented interleave is off. | |
3167 | * | |
3168 | * Note that it is important that an implementation that allows this | |
3169 | * option to be turned on, have it off by default. Otherwise an unaware | |
3170 | * application using the one to many model may become confused and act | |
3171 | * incorrectly. | |
3172 | */ | |
3173 | static int sctp_setsockopt_fragment_interleave(struct sock *sk, | |
3174 | char __user *optval, | |
b7058842 | 3175 | unsigned int optlen) |
b6e1331f VY |
3176 | { |
3177 | int val; | |
3178 | ||
3179 | if (optlen != sizeof(int)) | |
3180 | return -EINVAL; | |
3181 | if (get_user(val, (int __user *)optval)) | |
3182 | return -EFAULT; | |
3183 | ||
3184 | sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1; | |
3185 | ||
3186 | return 0; | |
3187 | } | |
3188 | ||
d49d91d7 | 3189 | /* |
8510b937 | 3190 | * 8.1.21. Set or Get the SCTP Partial Delivery Point |
d49d91d7 | 3191 | * (SCTP_PARTIAL_DELIVERY_POINT) |
8510b937 | 3192 | * |
d49d91d7 VY |
3193 | * This option will set or get the SCTP partial delivery point. This |
3194 | * point is the size of a message where the partial delivery API will be | |
3195 | * invoked to help free up rwnd space for the peer. Setting this to a | |
8510b937 | 3196 | * lower value will cause partial deliveries to happen more often. The |
d49d91d7 | 3197 | * calls argument is an integer that sets or gets the partial delivery |
8510b937 WY |
3198 | * point. Note also that the call will fail if the user attempts to set |
3199 | * this value larger than the socket receive buffer size. | |
3200 | * | |
3201 | * Note that any single message having a length smaller than or equal to | |
3202 | * the SCTP partial delivery point will be delivered in one single read | |
3203 | * call as long as the user provided buffer is large enough to hold the | |
3204 | * message. | |
d49d91d7 VY |
3205 | */ |
3206 | static int sctp_setsockopt_partial_delivery_point(struct sock *sk, | |
3207 | char __user *optval, | |
b7058842 | 3208 | unsigned int optlen) |
d49d91d7 VY |
3209 | { |
3210 | u32 val; | |
3211 | ||
3212 | if (optlen != sizeof(u32)) | |
3213 | return -EINVAL; | |
3214 | if (get_user(val, (int __user *)optval)) | |
3215 | return -EFAULT; | |
3216 | ||
8510b937 WY |
3217 | /* Note: We double the receive buffer from what the user sets |
3218 | * it to be, also initial rwnd is based on rcvbuf/2. | |
3219 | */ | |
3220 | if (val > (sk->sk_rcvbuf >> 1)) | |
3221 | return -EINVAL; | |
3222 | ||
d49d91d7 VY |
3223 | sctp_sk(sk)->pd_point = val; |
3224 | ||
3225 | return 0; /* is this the right error code? */ | |
3226 | } | |
3227 | ||
70331571 VY |
3228 | /* |
3229 | * 7.1.28. Set or Get the maximum burst (SCTP_MAX_BURST) | |
3230 | * | |
3231 | * This option will allow a user to change the maximum burst of packets | |
3232 | * that can be emitted by this association. Note that the default value | |
3233 | * is 4, and some implementations may restrict this setting so that it | |
3234 | * can only be lowered. | |
3235 | * | |
3236 | * NOTE: This text doesn't seem right. Do this on a socket basis with | |
3237 | * future associations inheriting the socket value. | |
3238 | */ | |
3239 | static int sctp_setsockopt_maxburst(struct sock *sk, | |
3240 | char __user *optval, | |
b7058842 | 3241 | unsigned int optlen) |
70331571 | 3242 | { |
219b99a9 NH |
3243 | struct sctp_assoc_value params; |
3244 | struct sctp_sock *sp; | |
3245 | struct sctp_association *asoc; | |
70331571 | 3246 | int val; |
219b99a9 | 3247 | int assoc_id = 0; |
70331571 | 3248 | |
219b99a9 | 3249 | if (optlen == sizeof(int)) { |
145ce502 JP |
3250 | pr_warn("Use of int in max_burst socket option deprecated\n"); |
3251 | pr_warn("Use struct sctp_assoc_value instead\n"); | |
219b99a9 NH |
3252 | if (copy_from_user(&val, optval, optlen)) |
3253 | return -EFAULT; | |
3254 | } else if (optlen == sizeof(struct sctp_assoc_value)) { | |
3255 | if (copy_from_user(¶ms, optval, optlen)) | |
3256 | return -EFAULT; | |
3257 | val = params.assoc_value; | |
3258 | assoc_id = params.assoc_id; | |
3259 | } else | |
70331571 VY |
3260 | return -EINVAL; |
3261 | ||
219b99a9 NH |
3262 | sp = sctp_sk(sk); |
3263 | ||
3264 | if (assoc_id != 0) { | |
3265 | asoc = sctp_id2assoc(sk, assoc_id); | |
3266 | if (!asoc) | |
3267 | return -EINVAL; | |
3268 | asoc->max_burst = val; | |
3269 | } else | |
3270 | sp->max_burst = val; | |
70331571 VY |
3271 | |
3272 | return 0; | |
3273 | } | |
3274 | ||
65b07e5d VY |
3275 | /* |
3276 | * 7.1.18. Add a chunk that must be authenticated (SCTP_AUTH_CHUNK) | |
3277 | * | |
3278 | * This set option adds a chunk type that the user is requesting to be | |
3279 | * received only in an authenticated way. Changes to the list of chunks | |
3280 | * will only effect future associations on the socket. | |
3281 | */ | |
3282 | static int sctp_setsockopt_auth_chunk(struct sock *sk, | |
b7058842 DM |
3283 | char __user *optval, |
3284 | unsigned int optlen) | |
65b07e5d | 3285 | { |
e1fc3b14 | 3286 | struct net *net = sock_net(sk); |
65b07e5d VY |
3287 | struct sctp_authchunk val; |
3288 | ||
e1fc3b14 | 3289 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3290 | return -EACCES; |
3291 | ||
65b07e5d VY |
3292 | if (optlen != sizeof(struct sctp_authchunk)) |
3293 | return -EINVAL; | |
3294 | if (copy_from_user(&val, optval, optlen)) | |
3295 | return -EFAULT; | |
3296 | ||
3297 | switch (val.sauth_chunk) { | |
7fd71b1e JP |
3298 | case SCTP_CID_INIT: |
3299 | case SCTP_CID_INIT_ACK: | |
3300 | case SCTP_CID_SHUTDOWN_COMPLETE: | |
3301 | case SCTP_CID_AUTH: | |
3302 | return -EINVAL; | |
65b07e5d VY |
3303 | } |
3304 | ||
3305 | /* add this chunk id to the endpoint */ | |
3306 | return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk); | |
3307 | } | |
3308 | ||
3309 | /* | |
3310 | * 7.1.19. Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT) | |
3311 | * | |
3312 | * This option gets or sets the list of HMAC algorithms that the local | |
3313 | * endpoint requires the peer to use. | |
3314 | */ | |
3315 | static int sctp_setsockopt_hmac_ident(struct sock *sk, | |
b7058842 DM |
3316 | char __user *optval, |
3317 | unsigned int optlen) | |
65b07e5d | 3318 | { |
e1fc3b14 | 3319 | struct net *net = sock_net(sk); |
65b07e5d | 3320 | struct sctp_hmacalgo *hmacs; |
d9724055 | 3321 | u32 idents; |
65b07e5d VY |
3322 | int err; |
3323 | ||
e1fc3b14 | 3324 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3325 | return -EACCES; |
3326 | ||
65b07e5d VY |
3327 | if (optlen < sizeof(struct sctp_hmacalgo)) |
3328 | return -EINVAL; | |
3329 | ||
934253a7 SW |
3330 | hmacs= memdup_user(optval, optlen); |
3331 | if (IS_ERR(hmacs)) | |
3332 | return PTR_ERR(hmacs); | |
65b07e5d | 3333 | |
d9724055 VY |
3334 | idents = hmacs->shmac_num_idents; |
3335 | if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || | |
3336 | (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { | |
65b07e5d VY |
3337 | err = -EINVAL; |
3338 | goto out; | |
3339 | } | |
3340 | ||
3341 | err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs); | |
3342 | out: | |
3343 | kfree(hmacs); | |
3344 | return err; | |
3345 | } | |
3346 | ||
3347 | /* | |
3348 | * 7.1.20. Set a shared key (SCTP_AUTH_KEY) | |
3349 | * | |
3350 | * This option will set a shared secret key which is used to build an | |
3351 | * association shared key. | |
3352 | */ | |
3353 | static int sctp_setsockopt_auth_key(struct sock *sk, | |
3354 | char __user *optval, | |
b7058842 | 3355 | unsigned int optlen) |
65b07e5d | 3356 | { |
e1fc3b14 | 3357 | struct net *net = sock_net(sk); |
65b07e5d VY |
3358 | struct sctp_authkey *authkey; |
3359 | struct sctp_association *asoc; | |
3360 | int ret; | |
3361 | ||
e1fc3b14 | 3362 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3363 | return -EACCES; |
3364 | ||
65b07e5d VY |
3365 | if (optlen <= sizeof(struct sctp_authkey)) |
3366 | return -EINVAL; | |
3367 | ||
934253a7 SW |
3368 | authkey= memdup_user(optval, optlen); |
3369 | if (IS_ERR(authkey)) | |
3370 | return PTR_ERR(authkey); | |
65b07e5d | 3371 | |
328fc47e | 3372 | if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) { |
30c2235c VY |
3373 | ret = -EINVAL; |
3374 | goto out; | |
3375 | } | |
3376 | ||
65b07e5d VY |
3377 | asoc = sctp_id2assoc(sk, authkey->sca_assoc_id); |
3378 | if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) { | |
3379 | ret = -EINVAL; | |
3380 | goto out; | |
3381 | } | |
3382 | ||
3383 | ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey); | |
3384 | out: | |
6ba542a2 | 3385 | kzfree(authkey); |
65b07e5d VY |
3386 | return ret; |
3387 | } | |
3388 | ||
3389 | /* | |
3390 | * 7.1.21. Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY) | |
3391 | * | |
3392 | * This option will get or set the active shared key to be used to build | |
3393 | * the association shared key. | |
3394 | */ | |
3395 | static int sctp_setsockopt_active_key(struct sock *sk, | |
b7058842 DM |
3396 | char __user *optval, |
3397 | unsigned int optlen) | |
65b07e5d | 3398 | { |
e1fc3b14 | 3399 | struct net *net = sock_net(sk); |
65b07e5d VY |
3400 | struct sctp_authkeyid val; |
3401 | struct sctp_association *asoc; | |
3402 | ||
e1fc3b14 | 3403 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3404 | return -EACCES; |
3405 | ||
65b07e5d VY |
3406 | if (optlen != sizeof(struct sctp_authkeyid)) |
3407 | return -EINVAL; | |
3408 | if (copy_from_user(&val, optval, optlen)) | |
3409 | return -EFAULT; | |
3410 | ||
3411 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3412 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3413 | return -EINVAL; | |
3414 | ||
3415 | return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc, | |
3416 | val.scact_keynumber); | |
3417 | } | |
3418 | ||
3419 | /* | |
3420 | * 7.1.22. Delete a shared key (SCTP_AUTH_DELETE_KEY) | |
3421 | * | |
3422 | * This set option will delete a shared secret key from use. | |
3423 | */ | |
3424 | static int sctp_setsockopt_del_key(struct sock *sk, | |
b7058842 DM |
3425 | char __user *optval, |
3426 | unsigned int optlen) | |
65b07e5d | 3427 | { |
e1fc3b14 | 3428 | struct net *net = sock_net(sk); |
65b07e5d VY |
3429 | struct sctp_authkeyid val; |
3430 | struct sctp_association *asoc; | |
3431 | ||
e1fc3b14 | 3432 | if (!net->sctp.auth_enable) |
5e739d17 VY |
3433 | return -EACCES; |
3434 | ||
65b07e5d VY |
3435 | if (optlen != sizeof(struct sctp_authkeyid)) |
3436 | return -EINVAL; | |
3437 | if (copy_from_user(&val, optval, optlen)) | |
3438 | return -EFAULT; | |
3439 | ||
3440 | asoc = sctp_id2assoc(sk, val.scact_assoc_id); | |
3441 | if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP)) | |
3442 | return -EINVAL; | |
3443 | ||
3444 | return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc, | |
3445 | val.scact_keynumber); | |
3446 | ||
3447 | } | |
3448 | ||
7dc04d71 MH |
3449 | /* |
3450 | * 8.1.23 SCTP_AUTO_ASCONF | |
3451 | * | |
3452 | * This option will enable or disable the use of the automatic generation of | |
3453 | * ASCONF chunks to add and delete addresses to an existing association. Note | |
3454 | * that this option has two caveats namely: a) it only affects sockets that | |
3455 | * are bound to all addresses available to the SCTP stack, and b) the system | |
3456 | * administrator may have an overriding control that turns the ASCONF feature | |
3457 | * off no matter what setting the socket option may have. | |
3458 | * This option expects an integer boolean flag, where a non-zero value turns on | |
3459 | * the option, and a zero value turns off the option. | |
3460 | * Note. In this implementation, socket operation overrides default parameter | |
3461 | * being set by sysctl as well as FreeBSD implementation | |
3462 | */ | |
3463 | static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval, | |
3464 | unsigned int optlen) | |
3465 | { | |
3466 | int val; | |
3467 | struct sctp_sock *sp = sctp_sk(sk); | |
3468 | ||
3469 | if (optlen < sizeof(int)) | |
3470 | return -EINVAL; | |
3471 | if (get_user(val, (int __user *)optval)) | |
3472 | return -EFAULT; | |
3473 | if (!sctp_is_ep_boundall(sk) && val) | |
3474 | return -EINVAL; | |
3475 | if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf)) | |
3476 | return 0; | |
3477 | ||
3478 | if (val == 0 && sp->do_auto_asconf) { | |
3479 | list_del(&sp->auto_asconf_list); | |
3480 | sp->do_auto_asconf = 0; | |
3481 | } else if (val && !sp->do_auto_asconf) { | |
3482 | list_add_tail(&sp->auto_asconf_list, | |
4db67e80 | 3483 | &sock_net(sk)->sctp.auto_asconf_splist); |
7dc04d71 MH |
3484 | sp->do_auto_asconf = 1; |
3485 | } | |
3486 | return 0; | |
3487 | } | |
3488 | ||
65b07e5d | 3489 | |
5aa93bcf NH |
3490 | /* |
3491 | * SCTP_PEER_ADDR_THLDS | |
3492 | * | |
3493 | * This option allows us to alter the partially failed threshold for one or all | |
3494 | * transports in an association. See Section 6.1 of: | |
3495 | * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt | |
3496 | */ | |
3497 | static int sctp_setsockopt_paddr_thresholds(struct sock *sk, | |
3498 | char __user *optval, | |
3499 | unsigned int optlen) | |
3500 | { | |
3501 | struct sctp_paddrthlds val; | |
3502 | struct sctp_transport *trans; | |
3503 | struct sctp_association *asoc; | |
3504 | ||
3505 | if (optlen < sizeof(struct sctp_paddrthlds)) | |
3506 | return -EINVAL; | |
3507 | if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, | |
3508 | sizeof(struct sctp_paddrthlds))) | |
3509 | return -EFAULT; | |
3510 | ||
3511 | ||
3512 | if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) { | |
3513 | asoc = sctp_id2assoc(sk, val.spt_assoc_id); | |
3514 | if (!asoc) | |
3515 | return -ENOENT; | |
3516 | list_for_each_entry(trans, &asoc->peer.transport_addr_list, | |
3517 | transports) { | |
3518 | if (val.spt_pathmaxrxt) | |
3519 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3520 | trans->pf_retrans = val.spt_pathpfthld; | |
3521 | } | |
3522 | ||
3523 | if (val.spt_pathmaxrxt) | |
3524 | asoc->pathmaxrxt = val.spt_pathmaxrxt; | |
3525 | asoc->pf_retrans = val.spt_pathpfthld; | |
3526 | } else { | |
3527 | trans = sctp_addr_id2transport(sk, &val.spt_address, | |
3528 | val.spt_assoc_id); | |
3529 | if (!trans) | |
3530 | return -ENOENT; | |
3531 | ||
3532 | if (val.spt_pathmaxrxt) | |
3533 | trans->pathmaxrxt = val.spt_pathmaxrxt; | |
3534 | trans->pf_retrans = val.spt_pathpfthld; | |
3535 | } | |
3536 | ||
3537 | return 0; | |
3538 | } | |
3539 | ||
1da177e4 LT |
3540 | /* API 6.2 setsockopt(), getsockopt() |
3541 | * | |
3542 | * Applications use setsockopt() and getsockopt() to set or retrieve | |
3543 | * socket options. Socket options are used to change the default | |
3544 | * behavior of sockets calls. They are described in Section 7. | |
3545 | * | |
3546 | * The syntax is: | |
3547 | * | |
3548 | * ret = getsockopt(int sd, int level, int optname, void __user *optval, | |
3549 | * int __user *optlen); | |
3550 | * ret = setsockopt(int sd, int level, int optname, const void __user *optval, | |
3551 | * int optlen); | |
3552 | * | |
3553 | * sd - the socket descript. | |
3554 | * level - set to IPPROTO_SCTP for all SCTP options. | |
3555 | * optname - the option name. | |
3556 | * optval - the buffer to store the value of the option. | |
3557 | * optlen - the size of the buffer. | |
3558 | */ | |
dda91928 DB |
3559 | static int sctp_setsockopt(struct sock *sk, int level, int optname, |
3560 | char __user *optval, unsigned int optlen) | |
1da177e4 LT |
3561 | { |
3562 | int retval = 0; | |
3563 | ||
3564 | SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n", | |
3565 | sk, optname); | |
3566 | ||
3567 | /* I can hardly begin to describe how wrong this is. This is | |
3568 | * so broken as to be worse than useless. The API draft | |
3569 | * REALLY is NOT helpful here... I am not convinced that the | |
3570 | * semantics of setsockopt() with a level OTHER THAN SOL_SCTP | |
3571 | * are at all well-founded. | |
3572 | */ | |
3573 | if (level != SOL_SCTP) { | |
3574 | struct sctp_af *af = sctp_sk(sk)->pf->af; | |
3575 | retval = af->setsockopt(sk, level, optname, optval, optlen); | |
3576 | goto out_nounlock; | |
3577 | } | |
3578 | ||
3579 | sctp_lock_sock(sk); | |
3580 | ||
3581 | switch (optname) { | |
3582 | case SCTP_SOCKOPT_BINDX_ADD: | |
3583 | /* 'optlen' is the size of the addresses buffer. */ | |
3584 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3585 | optlen, SCTP_BINDX_ADD_ADDR); | |
3586 | break; | |
3587 | ||
3588 | case SCTP_SOCKOPT_BINDX_REM: | |
3589 | /* 'optlen' is the size of the addresses buffer. */ | |
3590 | retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval, | |
3591 | optlen, SCTP_BINDX_REM_ADDR); | |
3592 | break; | |
3593 | ||
88a0a948 VY |
3594 | case SCTP_SOCKOPT_CONNECTX_OLD: |
3595 | /* 'optlen' is the size of the addresses buffer. */ | |
3596 | retval = sctp_setsockopt_connectx_old(sk, | |
3597 | (struct sockaddr __user *)optval, | |
3598 | optlen); | |
3599 | break; | |
3600 | ||
3f7a87d2 FF |
3601 | case SCTP_SOCKOPT_CONNECTX: |
3602 | /* 'optlen' is the size of the addresses buffer. */ | |
88a0a948 VY |
3603 | retval = sctp_setsockopt_connectx(sk, |
3604 | (struct sockaddr __user *)optval, | |
3605 | optlen); | |
3f7a87d2 FF |
3606 | break; |
3607 | ||
1da177e4 LT |
3608 | case SCTP_DISABLE_FRAGMENTS: |
3609 | retval = sctp_setsockopt_disable_fragments(sk, optval, optlen); | |
3610 | break; | |
3611 | ||
3612 | case SCTP_EVENTS: | |
3613 | retval = sctp_setsockopt_events(sk, optval, optlen); | |
3614 | break; | |
3615 | ||
3616 | case SCTP_AUTOCLOSE: | |
3617 | retval = sctp_setsockopt_autoclose(sk, optval, optlen); | |
3618 | break; | |
3619 | ||
3620 | case SCTP_PEER_ADDR_PARAMS: | |
3621 | retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen); | |
3622 | break; | |
3623 | ||
4580ccc0 | 3624 | case SCTP_DELAYED_SACK: |
d364d927 | 3625 | retval = sctp_setsockopt_delayed_ack(sk, optval, optlen); |
7708610b | 3626 | break; |
d49d91d7 VY |
3627 | case SCTP_PARTIAL_DELIVERY_POINT: |
3628 | retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen); | |
3629 | break; | |
7708610b | 3630 | |
1da177e4 LT |
3631 | case SCTP_INITMSG: |
3632 | retval = sctp_setsockopt_initmsg(sk, optval, optlen); | |
3633 | break; | |
3634 | case SCTP_DEFAULT_SEND_PARAM: | |
3635 | retval = sctp_setsockopt_default_send_param(sk, optval, | |
3636 | optlen); | |
3637 | break; | |
3638 | case SCTP_PRIMARY_ADDR: | |
3639 | retval = sctp_setsockopt_primary_addr(sk, optval, optlen); | |
3640 | break; | |
3641 | case SCTP_SET_PEER_PRIMARY_ADDR: | |
3642 | retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen); | |
3643 | break; | |
3644 | case SCTP_NODELAY: | |
3645 | retval = sctp_setsockopt_nodelay(sk, optval, optlen); | |
3646 | break; | |
3647 | case SCTP_RTOINFO: | |
3648 | retval = sctp_setsockopt_rtoinfo(sk, optval, optlen); | |
3649 | break; | |
3650 | case SCTP_ASSOCINFO: | |
3651 | retval = sctp_setsockopt_associnfo(sk, optval, optlen); | |
3652 | break; | |
3653 | case SCTP_I_WANT_MAPPED_V4_ADDR: | |
3654 | retval = sctp_setsockopt_mappedv4(sk, optval, optlen); | |
3655 | break; | |
3656 | case SCTP_MAXSEG: | |
3657 | retval = sctp_setsockopt_maxseg(sk, optval, optlen); | |
3658 | break; | |
0f3fffd8 ISJ |
3659 | case SCTP_ADAPTATION_LAYER: |
3660 | retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen); | |
1da177e4 | 3661 | break; |
6ab792f5 ISJ |
3662 | case SCTP_CONTEXT: |
3663 | retval = sctp_setsockopt_context(sk, optval, optlen); | |
3664 | break; | |
b6e1331f VY |
3665 | case SCTP_FRAGMENT_INTERLEAVE: |
3666 | retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen); | |
3667 | break; | |
70331571 VY |
3668 | case SCTP_MAX_BURST: |
3669 | retval = sctp_setsockopt_maxburst(sk, optval, optlen); | |
3670 | break; | |
65b07e5d VY |
3671 | case SCTP_AUTH_CHUNK: |
3672 | retval = sctp_setsockopt_auth_chunk(sk, optval, optlen); | |
3673 | break; | |
3674 | case SCTP_HMAC_IDENT: | |
3675 | retval = sctp_setsockopt_hmac_ident(sk, optval, optlen); | |
3676 | break; | |
3677 | case SCTP_AUTH_KEY: | |
3678 | retval = sctp_setsockopt_auth_key(sk, optval, optlen); | |
3679 | break; | |
3680 | case SCTP_AUTH_ACTIVE_KEY: | |
3681 | retval = sctp_setsockopt_active_key(sk, optval, optlen); | |
3682 | break; | |
3683 | case SCTP_AUTH_DELETE_KEY: | |
3684 | retval = sctp_setsockopt_del_key(sk, optval, optlen); | |
3685 | break; | |
7dc04d71 MH |
3686 | case SCTP_AUTO_ASCONF: |
3687 | retval = sctp_setsockopt_auto_asconf(sk, optval, optlen); | |
3688 | break; | |
5aa93bcf NH |
3689 | case SCTP_PEER_ADDR_THLDS: |
3690 | retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen); | |
3691 | break; | |
1da177e4 LT |
3692 | default: |
3693 | retval = -ENOPROTOOPT; | |
3694 | break; | |
3ff50b79 | 3695 | } |
1da177e4 LT |
3696 | |
3697 | sctp_release_sock(sk); | |
3698 | ||
3699 | out_nounlock: | |
3700 | return retval; | |
3701 | } | |
3702 | ||
3703 | /* API 3.1.6 connect() - UDP Style Syntax | |
3704 | * | |
3705 | * An application may use the connect() call in the UDP model to initiate an | |
3706 | * association without sending data. | |
3707 | * | |
3708 | * The syntax is: | |
3709 | * | |
3710 | * ret = connect(int sd, const struct sockaddr *nam, socklen_t len); | |
3711 | * | |
3712 | * sd: the socket descriptor to have a new association added to. | |
3713 | * | |
3714 | * nam: the address structure (either struct sockaddr_in or struct | |
3715 | * sockaddr_in6 defined in RFC2553 [7]). | |
3716 | * | |
3717 | * len: the size of the address. | |
3718 | */ | |
dda91928 DB |
3719 | static int sctp_connect(struct sock *sk, struct sockaddr *addr, |
3720 | int addr_len) | |
1da177e4 | 3721 | { |
1da177e4 | 3722 | int err = 0; |
3f7a87d2 | 3723 | struct sctp_af *af; |
1da177e4 LT |
3724 | |
3725 | sctp_lock_sock(sk); | |
3726 | ||
3f7a87d2 | 3727 | SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n", |
0dc47877 | 3728 | __func__, sk, addr, addr_len); |
1da177e4 | 3729 | |
3f7a87d2 FF |
3730 | /* Validate addr_len before calling common connect/connectx routine. */ |
3731 | af = sctp_get_af_specific(addr->sa_family); | |
3732 | if (!af || addr_len < af->sockaddr_len) { | |
3733 | err = -EINVAL; | |
3734 | } else { | |
3735 | /* Pass correct addr len to common routine (so it knows there | |
3736 | * is only one address being passed. | |
3737 | */ | |
88a0a948 | 3738 | err = __sctp_connect(sk, addr, af->sockaddr_len, NULL); |
1da177e4 LT |
3739 | } |
3740 | ||
1da177e4 | 3741 | sctp_release_sock(sk); |
1da177e4 LT |
3742 | return err; |
3743 | } | |
3744 | ||
3745 | /* FIXME: Write comments. */ | |
dda91928 | 3746 | static int sctp_disconnect(struct sock *sk, int flags) |
1da177e4 LT |
3747 | { |
3748 | return -EOPNOTSUPP; /* STUB */ | |
3749 | } | |
3750 | ||
3751 | /* 4.1.4 accept() - TCP Style Syntax | |
3752 | * | |
3753 | * Applications use accept() call to remove an established SCTP | |
3754 | * association from the accept queue of the endpoint. A new socket | |
3755 | * descriptor will be returned from accept() to represent the newly | |
3756 | * formed association. | |
3757 | */ | |
dda91928 | 3758 | static struct sock *sctp_accept(struct sock *sk, int flags, int *err) |
1da177e4 LT |
3759 | { |
3760 | struct sctp_sock *sp; | |
3761 | struct sctp_endpoint *ep; | |
3762 | struct sock *newsk = NULL; | |
3763 | struct sctp_association *asoc; | |
3764 | long timeo; | |
3765 | int error = 0; | |
3766 | ||
3767 | sctp_lock_sock(sk); | |
3768 | ||
3769 | sp = sctp_sk(sk); | |
3770 | ep = sp->ep; | |
3771 | ||
3772 | if (!sctp_style(sk, TCP)) { | |
3773 | error = -EOPNOTSUPP; | |
3774 | goto out; | |
3775 | } | |
3776 | ||
3777 | if (!sctp_sstate(sk, LISTENING)) { | |
3778 | error = -EINVAL; | |
3779 | goto out; | |
3780 | } | |
3781 | ||
8abfedd8 | 3782 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1da177e4 LT |
3783 | |
3784 | error = sctp_wait_for_accept(sk, timeo); | |
3785 | if (error) | |
3786 | goto out; | |
3787 | ||
3788 | /* We treat the list of associations on the endpoint as the accept | |
3789 | * queue and pick the first association on the list. | |
3790 | */ | |
3791 | asoc = list_entry(ep->asocs.next, struct sctp_association, asocs); | |
3792 | ||
3793 | newsk = sp->pf->create_accept_sk(sk, asoc); | |
3794 | if (!newsk) { | |
3795 | error = -ENOMEM; | |
3796 | goto out; | |
3797 | } | |
3798 | ||
3799 | /* Populate the fields of the newsk from the oldsk and migrate the | |
3800 | * asoc to the newsk. | |
3801 | */ | |
3802 | sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP); | |
3803 | ||
3804 | out: | |
3805 | sctp_release_sock(sk); | |
d808ad9a | 3806 | *err = error; |
1da177e4 LT |
3807 | return newsk; |
3808 | } | |
3809 | ||
3810 | /* The SCTP ioctl handler. */ | |
dda91928 | 3811 | static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1da177e4 | 3812 | { |
65040c33 DEFP |
3813 | int rc = -ENOTCONN; |
3814 | ||
3815 | sctp_lock_sock(sk); | |
3816 | ||
3817 | /* | |
3818 | * SEQPACKET-style sockets in LISTENING state are valid, for | |
3819 | * SCTP, so only discard TCP-style sockets in LISTENING state. | |
3820 | */ | |
3821 | if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) | |
3822 | goto out; | |
3823 | ||
3824 | switch (cmd) { | |
3825 | case SIOCINQ: { | |
3826 | struct sk_buff *skb; | |
3827 | unsigned int amount = 0; | |
3828 | ||
3829 | skb = skb_peek(&sk->sk_receive_queue); | |
3830 | if (skb != NULL) { | |
3831 | /* | |
3832 | * We will only return the amount of this packet since | |
3833 | * that is all that will be read. | |
3834 | */ | |
3835 | amount = skb->len; | |
3836 | } | |
3837 | rc = put_user(amount, (int __user *)arg); | |
65040c33 | 3838 | break; |
9a7241c2 | 3839 | } |
65040c33 DEFP |
3840 | default: |
3841 | rc = -ENOIOCTLCMD; | |
3842 | break; | |
3843 | } | |
3844 | out: | |
3845 | sctp_release_sock(sk); | |
3846 | return rc; | |
1da177e4 LT |
3847 | } |
3848 | ||
3849 | /* This is the function which gets called during socket creation to | |
3850 | * initialized the SCTP-specific portion of the sock. | |
3851 | * The sock structure should already be zero-filled memory. | |
3852 | */ | |
dda91928 | 3853 | static int sctp_init_sock(struct sock *sk) |
1da177e4 | 3854 | { |
e1fc3b14 | 3855 | struct net *net = sock_net(sk); |
1da177e4 LT |
3856 | struct sctp_sock *sp; |
3857 | ||
3858 | SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk); | |
3859 | ||
3860 | sp = sctp_sk(sk); | |
3861 | ||
3862 | /* Initialize the SCTP per socket area. */ | |
3863 | switch (sk->sk_type) { | |
3864 | case SOCK_SEQPACKET: | |
3865 | sp->type = SCTP_SOCKET_UDP; | |
3866 | break; | |
3867 | case SOCK_STREAM: | |
3868 | sp->type = SCTP_SOCKET_TCP; | |
3869 | break; | |
3870 | default: | |
3871 | return -ESOCKTNOSUPPORT; | |
3872 | } | |
3873 | ||
3874 | /* Initialize default send parameters. These parameters can be | |
3875 | * modified with the SCTP_DEFAULT_SEND_PARAM socket option. | |
3876 | */ | |
3877 | sp->default_stream = 0; | |
3878 | sp->default_ppid = 0; | |
3879 | sp->default_flags = 0; | |
3880 | sp->default_context = 0; | |
3881 | sp->default_timetolive = 0; | |
3882 | ||
6ab792f5 | 3883 | sp->default_rcv_context = 0; |
e1fc3b14 | 3884 | sp->max_burst = net->sctp.max_burst; |
6ab792f5 | 3885 | |
3c68198e NH |
3886 | sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg; |
3887 | ||
1da177e4 LT |
3888 | /* Initialize default setup parameters. These parameters |
3889 | * can be modified with the SCTP_INITMSG socket option or | |
3890 | * overridden by the SCTP_INIT CMSG. | |
3891 | */ | |
3892 | sp->initmsg.sinit_num_ostreams = sctp_max_outstreams; | |
3893 | sp->initmsg.sinit_max_instreams = sctp_max_instreams; | |
e1fc3b14 EB |
3894 | sp->initmsg.sinit_max_attempts = net->sctp.max_retrans_init; |
3895 | sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max; | |
1da177e4 LT |
3896 | |
3897 | /* Initialize default RTO related parameters. These parameters can | |
3898 | * be modified for with the SCTP_RTOINFO socket option. | |
3899 | */ | |
e1fc3b14 EB |
3900 | sp->rtoinfo.srto_initial = net->sctp.rto_initial; |
3901 | sp->rtoinfo.srto_max = net->sctp.rto_max; | |
3902 | sp->rtoinfo.srto_min = net->sctp.rto_min; | |
1da177e4 LT |
3903 | |
3904 | /* Initialize default association related parameters. These parameters | |
3905 | * can be modified with the SCTP_ASSOCINFO socket option. | |
3906 | */ | |
e1fc3b14 | 3907 | sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association; |
1da177e4 LT |
3908 | sp->assocparams.sasoc_number_peer_destinations = 0; |
3909 | sp->assocparams.sasoc_peer_rwnd = 0; | |
3910 | sp->assocparams.sasoc_local_rwnd = 0; | |
e1fc3b14 | 3911 | sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life; |
1da177e4 LT |
3912 | |
3913 | /* Initialize default event subscriptions. By default, all the | |
d808ad9a | 3914 | * options are off. |
1da177e4 LT |
3915 | */ |
3916 | memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe)); | |
3917 | ||
3918 | /* Default Peer Address Parameters. These defaults can | |
3919 | * be modified via SCTP_PEER_ADDR_PARAMS | |
3920 | */ | |
e1fc3b14 EB |
3921 | sp->hbinterval = net->sctp.hb_interval; |
3922 | sp->pathmaxrxt = net->sctp.max_retrans_path; | |
52ccb8e9 | 3923 | sp->pathmtu = 0; // allow default discovery |
e1fc3b14 | 3924 | sp->sackdelay = net->sctp.sack_timeout; |
7bfe8bdb | 3925 | sp->sackfreq = 2; |
52ccb8e9 | 3926 | sp->param_flags = SPP_HB_ENABLE | |
d808ad9a YH |
3927 | SPP_PMTUD_ENABLE | |
3928 | SPP_SACKDELAY_ENABLE; | |
1da177e4 LT |
3929 | |
3930 | /* If enabled no SCTP message fragmentation will be performed. | |
3931 | * Configure through SCTP_DISABLE_FRAGMENTS socket option. | |
3932 | */ | |
3933 | sp->disable_fragments = 0; | |
3934 | ||
208edef6 SS |
3935 | /* Enable Nagle algorithm by default. */ |
3936 | sp->nodelay = 0; | |
1da177e4 LT |
3937 | |
3938 | /* Enable by default. */ | |
3939 | sp->v4mapped = 1; | |
3940 | ||
3941 | /* Auto-close idle associations after the configured | |
3942 | * number of seconds. A value of 0 disables this | |
3943 | * feature. Configure through the SCTP_AUTOCLOSE socket option, | |
3944 | * for UDP-style sockets only. | |
3945 | */ | |
3946 | sp->autoclose = 0; | |
3947 | ||
3948 | /* User specified fragmentation limit. */ | |
3949 | sp->user_frag = 0; | |
3950 | ||
0f3fffd8 | 3951 | sp->adaptation_ind = 0; |
1da177e4 LT |
3952 | |
3953 | sp->pf = sctp_get_pf_specific(sk->sk_family); | |
3954 | ||
3955 | /* Control variables for partial data delivery. */ | |
b6e1331f | 3956 | atomic_set(&sp->pd_mode, 0); |
1da177e4 | 3957 | skb_queue_head_init(&sp->pd_lobby); |
b6e1331f | 3958 | sp->frag_interleave = 0; |
1da177e4 LT |
3959 | |
3960 | /* Create a per socket endpoint structure. Even if we | |
3961 | * change the data structure relationships, this may still | |
3962 | * be useful for storing pre-connect address information. | |
3963 | */ | |
c164b838 DB |
3964 | sp->ep = sctp_endpoint_new(sk, GFP_KERNEL); |
3965 | if (!sp->ep) | |
1da177e4 LT |
3966 | return -ENOMEM; |
3967 | ||
1da177e4 LT |
3968 | sp->hmac = NULL; |
3969 | ||
0a2fbac1 DB |
3970 | sk->sk_destruct = sctp_destruct_sock; |
3971 | ||
1da177e4 | 3972 | SCTP_DBG_OBJCNT_INC(sock); |
6f756a8c DM |
3973 | |
3974 | local_bh_disable(); | |
81419d86 | 3975 | percpu_counter_inc(&sctp_sockets_allocated); |
e1fc3b14 EB |
3976 | sock_prot_inuse_add(net, sk->sk_prot, 1); |
3977 | if (net->sctp.default_auto_asconf) { | |
9f7d653b | 3978 | list_add_tail(&sp->auto_asconf_list, |
e1fc3b14 | 3979 | &net->sctp.auto_asconf_splist); |
9f7d653b MH |
3980 | sp->do_auto_asconf = 1; |
3981 | } else | |
3982 | sp->do_auto_asconf = 0; | |
6f756a8c DM |
3983 | local_bh_enable(); |
3984 | ||
1da177e4 LT |
3985 | return 0; |
3986 | } | |
3987 | ||
3988 | /* Cleanup any SCTP per socket resources. */ | |
dda91928 | 3989 | static void sctp_destroy_sock(struct sock *sk) |
1da177e4 | 3990 | { |
9f7d653b | 3991 | struct sctp_sock *sp; |
1da177e4 LT |
3992 | |
3993 | SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk); | |
3994 | ||
3995 | /* Release our hold on the endpoint. */ | |
9f7d653b | 3996 | sp = sctp_sk(sk); |
1abd165e DB |
3997 | /* This could happen during socket init, thus we bail out |
3998 | * early, since the rest of the below is not setup either. | |
3999 | */ | |
4000 | if (sp->ep == NULL) | |
4001 | return; | |
4002 | ||
9f7d653b MH |
4003 | if (sp->do_auto_asconf) { |
4004 | sp->do_auto_asconf = 0; | |
4005 | list_del(&sp->auto_asconf_list); | |
4006 | } | |
4007 | sctp_endpoint_free(sp->ep); | |
5bc0b3bf | 4008 | local_bh_disable(); |
81419d86 | 4009 | percpu_counter_dec(&sctp_sockets_allocated); |
9a57f7fa | 4010 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
5bc0b3bf | 4011 | local_bh_enable(); |
1da177e4 LT |
4012 | } |
4013 | ||
0a2fbac1 DB |
4014 | /* Triggered when there are no references on the socket anymore */ |
4015 | static void sctp_destruct_sock(struct sock *sk) | |
4016 | { | |
4017 | struct sctp_sock *sp = sctp_sk(sk); | |
4018 | ||
4019 | /* Free up the HMAC transform. */ | |
4020 | crypto_free_hash(sp->hmac); | |
4021 | ||
4022 | inet_sock_destruct(sk); | |
4023 | } | |
4024 | ||
1da177e4 LT |
4025 | /* API 4.1.7 shutdown() - TCP Style Syntax |
4026 | * int shutdown(int socket, int how); | |
4027 | * | |
4028 | * sd - the socket descriptor of the association to be closed. | |
4029 | * how - Specifies the type of shutdown. The values are | |
4030 | * as follows: | |
4031 | * SHUT_RD | |
4032 | * Disables further receive operations. No SCTP | |
4033 | * protocol action is taken. | |
4034 | * SHUT_WR | |
4035 | * Disables further send operations, and initiates | |
4036 | * the SCTP shutdown sequence. | |
4037 | * SHUT_RDWR | |
4038 | * Disables further send and receive operations | |
4039 | * and initiates the SCTP shutdown sequence. | |
4040 | */ | |
dda91928 | 4041 | static void sctp_shutdown(struct sock *sk, int how) |
1da177e4 | 4042 | { |
55e26eb9 | 4043 | struct net *net = sock_net(sk); |
1da177e4 LT |
4044 | struct sctp_endpoint *ep; |
4045 | struct sctp_association *asoc; | |
4046 | ||
4047 | if (!sctp_style(sk, TCP)) | |
4048 | return; | |
4049 | ||
4050 | if (how & SEND_SHUTDOWN) { | |
4051 | ep = sctp_sk(sk)->ep; | |
4052 | if (!list_empty(&ep->asocs)) { | |
4053 | asoc = list_entry(ep->asocs.next, | |
4054 | struct sctp_association, asocs); | |
55e26eb9 | 4055 | sctp_primitive_SHUTDOWN(net, asoc, NULL); |
1da177e4 LT |
4056 | } |
4057 | } | |
4058 | } | |
4059 | ||
4060 | /* 7.2.1 Association Status (SCTP_STATUS) | |
4061 | ||
4062 | * Applications can retrieve current status information about an | |
4063 | * association, including association state, peer receiver window size, | |
4064 | * number of unacked data chunks, and number of data chunks pending | |
4065 | * receipt. This information is read-only. | |
4066 | */ | |
4067 | static int sctp_getsockopt_sctp_status(struct sock *sk, int len, | |
4068 | char __user *optval, | |
4069 | int __user *optlen) | |
4070 | { | |
4071 | struct sctp_status status; | |
4072 | struct sctp_association *asoc = NULL; | |
4073 | struct sctp_transport *transport; | |
4074 | sctp_assoc_t associd; | |
4075 | int retval = 0; | |
4076 | ||
408f22e8 | 4077 | if (len < sizeof(status)) { |
1da177e4 LT |
4078 | retval = -EINVAL; |
4079 | goto out; | |
4080 | } | |
4081 | ||
408f22e8 NH |
4082 | len = sizeof(status); |
4083 | if (copy_from_user(&status, optval, len)) { | |
1da177e4 LT |
4084 | retval = -EFAULT; |
4085 | goto out; | |
4086 | } | |
4087 | ||
4088 | associd = status.sstat_assoc_id; | |
4089 | asoc = sctp_id2assoc(sk, associd); | |
4090 | if (!asoc) { | |
4091 | retval = -EINVAL; | |
4092 | goto out; | |
4093 | } | |
4094 | ||
4095 | transport = asoc->peer.primary_path; | |
4096 | ||
4097 | status.sstat_assoc_id = sctp_assoc2id(asoc); | |
4098 | status.sstat_state = asoc->state; | |
4099 | status.sstat_rwnd = asoc->peer.rwnd; | |
4100 | status.sstat_unackdata = asoc->unack_data; | |
4101 | ||
4102 | status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map); | |
4103 | status.sstat_instrms = asoc->c.sinit_max_instreams; | |
4104 | status.sstat_outstrms = asoc->c.sinit_num_ostreams; | |
4105 | status.sstat_fragmentation_point = asoc->frag_point; | |
4106 | status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
8cec6b80 AV |
4107 | memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr, |
4108 | transport->af_specific->sockaddr_len); | |
1da177e4 LT |
4109 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
4110 | sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk), | |
4111 | (union sctp_addr *)&status.sstat_primary.spinfo_address); | |
3f7a87d2 | 4112 | status.sstat_primary.spinfo_state = transport->state; |
1da177e4 LT |
4113 | status.sstat_primary.spinfo_cwnd = transport->cwnd; |
4114 | status.sstat_primary.spinfo_srtt = transport->srtt; | |
4115 | status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4116 | status.sstat_primary.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4117 | |
3f7a87d2 FF |
4118 | if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN) |
4119 | status.sstat_primary.spinfo_state = SCTP_ACTIVE; | |
4120 | ||
1da177e4 LT |
4121 | if (put_user(len, optlen)) { |
4122 | retval = -EFAULT; | |
4123 | goto out; | |
4124 | } | |
4125 | ||
4126 | SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n", | |
4127 | len, status.sstat_state, status.sstat_rwnd, | |
4128 | status.sstat_assoc_id); | |
4129 | ||
4130 | if (copy_to_user(optval, &status, len)) { | |
4131 | retval = -EFAULT; | |
4132 | goto out; | |
4133 | } | |
4134 | ||
4135 | out: | |
a02cec21 | 4136 | return retval; |
1da177e4 LT |
4137 | } |
4138 | ||
4139 | ||
4140 | /* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO) | |
4141 | * | |
4142 | * Applications can retrieve information about a specific peer address | |
4143 | * of an association, including its reachability state, congestion | |
4144 | * window, and retransmission timer values. This information is | |
4145 | * read-only. | |
4146 | */ | |
4147 | static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len, | |
4148 | char __user *optval, | |
4149 | int __user *optlen) | |
4150 | { | |
4151 | struct sctp_paddrinfo pinfo; | |
4152 | struct sctp_transport *transport; | |
4153 | int retval = 0; | |
4154 | ||
408f22e8 | 4155 | if (len < sizeof(pinfo)) { |
1da177e4 LT |
4156 | retval = -EINVAL; |
4157 | goto out; | |
4158 | } | |
4159 | ||
408f22e8 NH |
4160 | len = sizeof(pinfo); |
4161 | if (copy_from_user(&pinfo, optval, len)) { | |
1da177e4 LT |
4162 | retval = -EFAULT; |
4163 | goto out; | |
4164 | } | |
4165 | ||
4166 | transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address, | |
4167 | pinfo.spinfo_assoc_id); | |
4168 | if (!transport) | |
4169 | return -EINVAL; | |
4170 | ||
4171 | pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc); | |
3f7a87d2 | 4172 | pinfo.spinfo_state = transport->state; |
1da177e4 LT |
4173 | pinfo.spinfo_cwnd = transport->cwnd; |
4174 | pinfo.spinfo_srtt = transport->srtt; | |
4175 | pinfo.spinfo_rto = jiffies_to_msecs(transport->rto); | |
52ccb8e9 | 4176 | pinfo.spinfo_mtu = transport->pathmtu; |
1da177e4 | 4177 | |
3f7a87d2 FF |
4178 | if (pinfo.spinfo_state == SCTP_UNKNOWN) |
4179 | pinfo.spinfo_state = SCTP_ACTIVE; | |
4180 | ||
1da177e4 LT |
4181 | if (put_user(len, optlen)) { |
4182 | retval = -EFAULT; | |
4183 | goto out; | |
4184 | } | |
4185 | ||
4186 | if (copy_to_user(optval, &pinfo, len)) { | |
4187 | retval = -EFAULT; | |
4188 | goto out; | |
4189 | } | |
4190 | ||
4191 | out: | |
a02cec21 | 4192 | return retval; |
1da177e4 LT |
4193 | } |
4194 | ||
4195 | /* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS) | |
4196 | * | |
4197 | * This option is a on/off flag. If enabled no SCTP message | |
4198 | * fragmentation will be performed. Instead if a message being sent | |
4199 | * exceeds the current PMTU size, the message will NOT be sent and | |
4200 | * instead a error will be indicated to the user. | |
4201 | */ | |
4202 | static int sctp_getsockopt_disable_fragments(struct sock *sk, int len, | |
4203 | char __user *optval, int __user *optlen) | |
4204 | { | |
4205 | int val; | |
4206 | ||
4207 | if (len < sizeof(int)) | |
4208 | return -EINVAL; | |
4209 | ||
4210 | len = sizeof(int); | |
4211 | val = (sctp_sk(sk)->disable_fragments == 1); | |
4212 | if (put_user(len, optlen)) | |
4213 | return -EFAULT; | |
4214 | if (copy_to_user(optval, &val, len)) | |
4215 | return -EFAULT; | |
4216 | return 0; | |
4217 | } | |
4218 | ||
4219 | /* 7.1.15 Set notification and ancillary events (SCTP_EVENTS) | |
4220 | * | |
4221 | * This socket option is used to specify various notifications and | |
4222 | * ancillary data the user wishes to receive. | |
4223 | */ | |
4224 | static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval, | |
4225 | int __user *optlen) | |
4226 | { | |
acdd5985 | 4227 | if (len <= 0) |
1da177e4 | 4228 | return -EINVAL; |
acdd5985 TG |
4229 | if (len > sizeof(struct sctp_event_subscribe)) |
4230 | len = sizeof(struct sctp_event_subscribe); | |
408f22e8 NH |
4231 | if (put_user(len, optlen)) |
4232 | return -EFAULT; | |
1da177e4 LT |
4233 | if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len)) |
4234 | return -EFAULT; | |
4235 | return 0; | |
4236 | } | |
4237 | ||
4238 | /* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE) | |
4239 | * | |
4240 | * This socket option is applicable to the UDP-style socket only. When | |
4241 | * set it will cause associations that are idle for more than the | |
4242 | * specified number of seconds to automatically close. An association | |
4243 | * being idle is defined an association that has NOT sent or received | |
4244 | * user data. The special value of '0' indicates that no automatic | |
4245 | * close of any associations should be performed. The option expects an | |
4246 | * integer defining the number of seconds of idle time before an | |
4247 | * association is closed. | |
4248 | */ | |
4249 | static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4250 | { | |
4251 | /* Applicable to UDP-style socket only */ | |
4252 | if (sctp_style(sk, TCP)) | |
4253 | return -EOPNOTSUPP; | |
408f22e8 | 4254 | if (len < sizeof(int)) |
1da177e4 | 4255 | return -EINVAL; |
408f22e8 NH |
4256 | len = sizeof(int); |
4257 | if (put_user(len, optlen)) | |
4258 | return -EFAULT; | |
4259 | if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int))) | |
1da177e4 LT |
4260 | return -EFAULT; |
4261 | return 0; | |
4262 | } | |
4263 | ||
4264 | /* Helper routine to branch off an association to a new socket. */ | |
0343c554 | 4265 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp) |
1da177e4 | 4266 | { |
0343c554 | 4267 | struct sctp_association *asoc = sctp_id2assoc(sk, id); |
1da177e4 | 4268 | struct socket *sock; |
d570ee49 | 4269 | struct sctp_af *af; |
1da177e4 LT |
4270 | int err = 0; |
4271 | ||
0343c554 BP |
4272 | if (!asoc) |
4273 | return -EINVAL; | |
4274 | ||
1da177e4 LT |
4275 | /* An association cannot be branched off from an already peeled-off |
4276 | * socket, nor is this supported for tcp style sockets. | |
4277 | */ | |
4278 | if (!sctp_style(sk, UDP)) | |
4279 | return -EINVAL; | |
4280 | ||
4281 | /* Create a new socket. */ | |
4282 | err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock); | |
4283 | if (err < 0) | |
4284 | return err; | |
4285 | ||
914e1c8b | 4286 | sctp_copy_sock(sock->sk, sk, asoc); |
4f444308 VY |
4287 | |
4288 | /* Make peeled-off sockets more like 1-1 accepted sockets. | |
4289 | * Set the daddr and initialize id to something more random | |
4290 | */ | |
d570ee49 VY |
4291 | af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family); |
4292 | af->to_sk_daddr(&asoc->peer.primary_addr, sk); | |
914e1c8b VY |
4293 | |
4294 | /* Populate the fields of the newsk from the oldsk and migrate the | |
4295 | * asoc to the newsk. | |
4296 | */ | |
4297 | sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH); | |
4f444308 | 4298 | |
1da177e4 LT |
4299 | *sockp = sock; |
4300 | ||
4301 | return err; | |
4302 | } | |
0343c554 | 4303 | EXPORT_SYMBOL(sctp_do_peeloff); |
1da177e4 LT |
4304 | |
4305 | static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4306 | { | |
4307 | sctp_peeloff_arg_t peeloff; | |
4308 | struct socket *newsock; | |
56b31d1c | 4309 | struct file *newfile; |
1da177e4 | 4310 | int retval = 0; |
1da177e4 | 4311 | |
408f22e8 | 4312 | if (len < sizeof(sctp_peeloff_arg_t)) |
1da177e4 | 4313 | return -EINVAL; |
408f22e8 | 4314 | len = sizeof(sctp_peeloff_arg_t); |
1da177e4 LT |
4315 | if (copy_from_user(&peeloff, optval, len)) |
4316 | return -EFAULT; | |
4317 | ||
0343c554 | 4318 | retval = sctp_do_peeloff(sk, peeloff.associd, &newsock); |
1da177e4 LT |
4319 | if (retval < 0) |
4320 | goto out; | |
4321 | ||
4322 | /* Map the socket to an unused fd that can be returned to the user. */ | |
56b31d1c | 4323 | retval = get_unused_fd(); |
1da177e4 LT |
4324 | if (retval < 0) { |
4325 | sock_release(newsock); | |
4326 | goto out; | |
4327 | } | |
4328 | ||
aab174f0 | 4329 | newfile = sock_alloc_file(newsock, 0, NULL); |
56b31d1c AV |
4330 | if (unlikely(IS_ERR(newfile))) { |
4331 | put_unused_fd(retval); | |
4332 | sock_release(newsock); | |
4333 | return PTR_ERR(newfile); | |
4334 | } | |
4335 | ||
0343c554 BP |
4336 | SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n", |
4337 | __func__, sk, newsock->sk, retval); | |
1da177e4 LT |
4338 | |
4339 | /* Return the fd mapped to the new socket. */ | |
56b31d1c AV |
4340 | if (put_user(len, optlen)) { |
4341 | fput(newfile); | |
4342 | put_unused_fd(retval); | |
4343 | return -EFAULT; | |
4344 | } | |
1da177e4 | 4345 | peeloff.sd = retval; |
56b31d1c AV |
4346 | if (copy_to_user(optval, &peeloff, len)) { |
4347 | fput(newfile); | |
4348 | put_unused_fd(retval); | |
408f22e8 | 4349 | return -EFAULT; |
56b31d1c AV |
4350 | } |
4351 | fd_install(retval, newfile); | |
1da177e4 LT |
4352 | out: |
4353 | return retval; | |
4354 | } | |
4355 | ||
4356 | /* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS) | |
4357 | * | |
4358 | * Applications can enable or disable heartbeats for any peer address of | |
4359 | * an association, modify an address's heartbeat interval, force a | |
4360 | * heartbeat to be sent immediately, and adjust the address's maximum | |
4361 | * number of retransmissions sent before an address is considered | |
4362 | * unreachable. The following structure is used to access and modify an | |
4363 | * address's parameters: | |
4364 | * | |
4365 | * struct sctp_paddrparams { | |
52ccb8e9 FF |
4366 | * sctp_assoc_t spp_assoc_id; |
4367 | * struct sockaddr_storage spp_address; | |
4368 | * uint32_t spp_hbinterval; | |
4369 | * uint16_t spp_pathmaxrxt; | |
4370 | * uint32_t spp_pathmtu; | |
4371 | * uint32_t spp_sackdelay; | |
4372 | * uint32_t spp_flags; | |
4373 | * }; | |
4374 | * | |
4375 | * spp_assoc_id - (one-to-many style socket) This is filled in the | |
4376 | * application, and identifies the association for | |
4377 | * this query. | |
1da177e4 LT |
4378 | * spp_address - This specifies which address is of interest. |
4379 | * spp_hbinterval - This contains the value of the heartbeat interval, | |
52ccb8e9 FF |
4380 | * in milliseconds. If a value of zero |
4381 | * is present in this field then no changes are to | |
4382 | * be made to this parameter. | |
1da177e4 LT |
4383 | * spp_pathmaxrxt - This contains the maximum number of |
4384 | * retransmissions before this address shall be | |
52ccb8e9 FF |
4385 | * considered unreachable. If a value of zero |
4386 | * is present in this field then no changes are to | |
4387 | * be made to this parameter. | |
4388 | * spp_pathmtu - When Path MTU discovery is disabled the value | |
4389 | * specified here will be the "fixed" path mtu. | |
4390 | * Note that if the spp_address field is empty | |
4391 | * then all associations on this address will | |
4392 | * have this fixed path mtu set upon them. | |
4393 | * | |
4394 | * spp_sackdelay - When delayed sack is enabled, this value specifies | |
4395 | * the number of milliseconds that sacks will be delayed | |
4396 | * for. This value will apply to all addresses of an | |
4397 | * association if the spp_address field is empty. Note | |
4398 | * also, that if delayed sack is enabled and this | |
4399 | * value is set to 0, no change is made to the last | |
4400 | * recorded delayed sack timer value. | |
4401 | * | |
4402 | * spp_flags - These flags are used to control various features | |
4403 | * on an association. The flag field may contain | |
4404 | * zero or more of the following options. | |
4405 | * | |
4406 | * SPP_HB_ENABLE - Enable heartbeats on the | |
4407 | * specified address. Note that if the address | |
4408 | * field is empty all addresses for the association | |
4409 | * have heartbeats enabled upon them. | |
4410 | * | |
4411 | * SPP_HB_DISABLE - Disable heartbeats on the | |
4412 | * speicifed address. Note that if the address | |
4413 | * field is empty all addresses for the association | |
4414 | * will have their heartbeats disabled. Note also | |
4415 | * that SPP_HB_ENABLE and SPP_HB_DISABLE are | |
4416 | * mutually exclusive, only one of these two should | |
4417 | * be specified. Enabling both fields will have | |
4418 | * undetermined results. | |
4419 | * | |
4420 | * SPP_HB_DEMAND - Request a user initiated heartbeat | |
4421 | * to be made immediately. | |
4422 | * | |
4423 | * SPP_PMTUD_ENABLE - This field will enable PMTU | |
4424 | * discovery upon the specified address. Note that | |
4425 | * if the address feild is empty then all addresses | |
4426 | * on the association are effected. | |
4427 | * | |
4428 | * SPP_PMTUD_DISABLE - This field will disable PMTU | |
4429 | * discovery upon the specified address. Note that | |
4430 | * if the address feild is empty then all addresses | |
4431 | * on the association are effected. Not also that | |
4432 | * SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually | |
4433 | * exclusive. Enabling both will have undetermined | |
4434 | * results. | |
4435 | * | |
4436 | * SPP_SACKDELAY_ENABLE - Setting this flag turns | |
4437 | * on delayed sack. The time specified in spp_sackdelay | |
4438 | * is used to specify the sack delay for this address. Note | |
4439 | * that if spp_address is empty then all addresses will | |
4440 | * enable delayed sack and take on the sack delay | |
4441 | * value specified in spp_sackdelay. | |
4442 | * SPP_SACKDELAY_DISABLE - Setting this flag turns | |
4443 | * off delayed sack. If the spp_address field is blank then | |
4444 | * delayed sack is disabled for the entire association. Note | |
4445 | * also that this field is mutually exclusive to | |
4446 | * SPP_SACKDELAY_ENABLE, setting both will have undefined | |
4447 | * results. | |
1da177e4 LT |
4448 | */ |
4449 | static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len, | |
52ccb8e9 | 4450 | char __user *optval, int __user *optlen) |
1da177e4 | 4451 | { |
52ccb8e9 FF |
4452 | struct sctp_paddrparams params; |
4453 | struct sctp_transport *trans = NULL; | |
4454 | struct sctp_association *asoc = NULL; | |
4455 | struct sctp_sock *sp = sctp_sk(sk); | |
1da177e4 | 4456 | |
408f22e8 | 4457 | if (len < sizeof(struct sctp_paddrparams)) |
1da177e4 | 4458 | return -EINVAL; |
408f22e8 | 4459 | len = sizeof(struct sctp_paddrparams); |
1da177e4 LT |
4460 | if (copy_from_user(¶ms, optval, len)) |
4461 | return -EFAULT; | |
4462 | ||
52ccb8e9 FF |
4463 | /* If an address other than INADDR_ANY is specified, and |
4464 | * no transport is found, then the request is invalid. | |
1da177e4 | 4465 | */ |
52cae8f0 | 4466 | if (!sctp_is_any(sk, ( union sctp_addr *)¶ms.spp_address)) { |
52ccb8e9 FF |
4467 | trans = sctp_addr_id2transport(sk, ¶ms.spp_address, |
4468 | params.spp_assoc_id); | |
4469 | if (!trans) { | |
4470 | SCTP_DEBUG_PRINTK("Failed no transport\n"); | |
4471 | return -EINVAL; | |
4472 | } | |
1da177e4 LT |
4473 | } |
4474 | ||
52ccb8e9 FF |
4475 | /* Get association, if assoc_id != 0 and the socket is a one |
4476 | * to many style socket, and an association was not found, then | |
4477 | * the id was invalid. | |
4478 | */ | |
4479 | asoc = sctp_id2assoc(sk, params.spp_assoc_id); | |
4480 | if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) { | |
4481 | SCTP_DEBUG_PRINTK("Failed no association\n"); | |
1da177e4 | 4482 | return -EINVAL; |
52ccb8e9 | 4483 | } |
1da177e4 | 4484 | |
52ccb8e9 FF |
4485 | if (trans) { |
4486 | /* Fetch transport values. */ | |
4487 | params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval); | |
4488 | params.spp_pathmtu = trans->pathmtu; | |
4489 | params.spp_pathmaxrxt = trans->pathmaxrxt; | |
4490 | params.spp_sackdelay = jiffies_to_msecs(trans->sackdelay); | |
4491 | ||
4492 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4493 | params.spp_flags = trans->param_flags; | |
4494 | } else if (asoc) { | |
4495 | /* Fetch association values. */ | |
4496 | params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval); | |
4497 | params.spp_pathmtu = asoc->pathmtu; | |
4498 | params.spp_pathmaxrxt = asoc->pathmaxrxt; | |
4499 | params.spp_sackdelay = jiffies_to_msecs(asoc->sackdelay); | |
4500 | ||
4501 | /*draft-11 doesn't say what to return in spp_flags*/ | |
4502 | params.spp_flags = asoc->param_flags; | |
4503 | } else { | |
4504 | /* Fetch socket values. */ | |
4505 | params.spp_hbinterval = sp->hbinterval; | |
4506 | params.spp_pathmtu = sp->pathmtu; | |
4507 | params.spp_sackdelay = sp->sackdelay; | |
4508 | params.spp_pathmaxrxt = sp->pathmaxrxt; | |
1da177e4 | 4509 | |
52ccb8e9 FF |
4510 | /*draft-11 doesn't say what to return in spp_flags*/ |
4511 | params.spp_flags = sp->param_flags; | |
4512 | } | |
1da177e4 | 4513 | |
1da177e4 LT |
4514 | if (copy_to_user(optval, ¶ms, len)) |
4515 | return -EFAULT; | |
4516 | ||
4517 | if (put_user(len, optlen)) | |
4518 | return -EFAULT; | |
4519 | ||
4520 | return 0; | |
4521 | } | |
4522 | ||
d364d927 WY |
4523 | /* |
4524 | * 7.1.23. Get or set delayed ack timer (SCTP_DELAYED_SACK) | |
4525 | * | |
4526 | * This option will effect the way delayed acks are performed. This | |
4527 | * option allows you to get or set the delayed ack time, in | |
4528 | * milliseconds. It also allows changing the delayed ack frequency. | |
4529 | * Changing the frequency to 1 disables the delayed sack algorithm. If | |
4530 | * the assoc_id is 0, then this sets or gets the endpoints default | |
4531 | * values. If the assoc_id field is non-zero, then the set or get | |
4532 | * effects the specified association for the one to many model (the | |
4533 | * assoc_id field is ignored by the one to one model). Note that if | |
4534 | * sack_delay or sack_freq are 0 when setting this option, then the | |
4535 | * current values will remain unchanged. | |
4536 | * | |
4537 | * struct sctp_sack_info { | |
4538 | * sctp_assoc_t sack_assoc_id; | |
4539 | * uint32_t sack_delay; | |
4540 | * uint32_t sack_freq; | |
4541 | * }; | |
7708610b | 4542 | * |
d364d927 WY |
4543 | * sack_assoc_id - This parameter, indicates which association the user |
4544 | * is performing an action upon. Note that if this field's value is | |
4545 | * zero then the endpoints default value is changed (effecting future | |
4546 | * associations only). | |
7708610b | 4547 | * |
d364d927 WY |
4548 | * sack_delay - This parameter contains the number of milliseconds that |
4549 | * the user is requesting the delayed ACK timer be set to. Note that | |
4550 | * this value is defined in the standard to be between 200 and 500 | |
4551 | * milliseconds. | |
7708610b | 4552 | * |
d364d927 WY |
4553 | * sack_freq - This parameter contains the number of packets that must |
4554 | * be received before a sack is sent without waiting for the delay | |
4555 | * timer to expire. The default value for this is 2, setting this | |
4556 | * value to 1 will disable the delayed sack algorithm. | |
7708610b | 4557 | */ |
d364d927 | 4558 | static int sctp_getsockopt_delayed_ack(struct sock *sk, int len, |
7708610b FF |
4559 | char __user *optval, |
4560 | int __user *optlen) | |
4561 | { | |
d364d927 | 4562 | struct sctp_sack_info params; |
7708610b FF |
4563 | struct sctp_association *asoc = NULL; |
4564 | struct sctp_sock *sp = sctp_sk(sk); | |
4565 | ||
d364d927 WY |
4566 | if (len >= sizeof(struct sctp_sack_info)) { |
4567 | len = sizeof(struct sctp_sack_info); | |
7708610b | 4568 | |
d364d927 WY |
4569 | if (copy_from_user(¶ms, optval, len)) |
4570 | return -EFAULT; | |
4571 | } else if (len == sizeof(struct sctp_assoc_value)) { | |
145ce502 JP |
4572 | pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n"); |
4573 | pr_warn("Use struct sctp_sack_info instead\n"); | |
d364d927 WY |
4574 | if (copy_from_user(¶ms, optval, len)) |
4575 | return -EFAULT; | |
4576 | } else | |
4577 | return - EINVAL; | |
7708610b | 4578 | |
d364d927 | 4579 | /* Get association, if sack_assoc_id != 0 and the socket is a one |
7708610b FF |
4580 | * to many style socket, and an association was not found, then |
4581 | * the id was invalid. | |
d808ad9a | 4582 | */ |
d364d927 WY |
4583 | asoc = sctp_id2assoc(sk, params.sack_assoc_id); |
4584 | if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP)) | |
7708610b FF |
4585 | return -EINVAL; |
4586 | ||
4587 | if (asoc) { | |
4588 | /* Fetch association values. */ | |
d364d927 WY |
4589 | if (asoc->param_flags & SPP_SACKDELAY_ENABLE) { |
4590 | params.sack_delay = jiffies_to_msecs( | |
7708610b | 4591 | asoc->sackdelay); |
d364d927 WY |
4592 | params.sack_freq = asoc->sackfreq; |
4593 | ||
4594 | } else { | |
4595 | params.sack_delay = 0; | |
4596 | params.sack_freq = 1; | |
4597 | } | |
7708610b FF |
4598 | } else { |
4599 | /* Fetch socket values. */ | |
d364d927 WY |
4600 | if (sp->param_flags & SPP_SACKDELAY_ENABLE) { |
4601 | params.sack_delay = sp->sackdelay; | |
4602 | params.sack_freq = sp->sackfreq; | |
4603 | } else { | |
4604 | params.sack_delay = 0; | |
4605 | params.sack_freq = 1; | |
4606 | } | |
7708610b FF |
4607 | } |
4608 | ||
4609 | if (copy_to_user(optval, ¶ms, len)) | |
4610 | return -EFAULT; | |
4611 | ||
4612 | if (put_user(len, optlen)) | |
4613 | return -EFAULT; | |
4614 | ||
4615 | return 0; | |
4616 | } | |
4617 | ||
1da177e4 LT |
4618 | /* 7.1.3 Initialization Parameters (SCTP_INITMSG) |
4619 | * | |
4620 | * Applications can specify protocol parameters for the default association | |
4621 | * initialization. The option name argument to setsockopt() and getsockopt() | |
4622 | * is SCTP_INITMSG. | |
4623 | * | |
4624 | * Setting initialization parameters is effective only on an unconnected | |
4625 | * socket (for UDP-style sockets only future associations are effected | |
4626 | * by the change). With TCP-style sockets, this option is inherited by | |
4627 | * sockets derived from a listener socket. | |
4628 | */ | |
4629 | static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen) | |
4630 | { | |
408f22e8 | 4631 | if (len < sizeof(struct sctp_initmsg)) |
1da177e4 | 4632 | return -EINVAL; |
408f22e8 NH |
4633 | len = sizeof(struct sctp_initmsg); |
4634 | if (put_user(len, optlen)) | |
4635 | return -EFAULT; | |
1da177e4 LT |
4636 | if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len)) |
4637 | return -EFAULT; | |
4638 | return 0; | |
4639 | } | |
4640 | ||