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