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fs/btrfs/inode.c: Add missing IS_ERR test
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sctp / sm_make_chunk.c
blob246f92924658b7d5dca18ae4d4a212d590b3e4d8
1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2001, 2004
3 * Copyright (c) 1999-2000 Cisco, Inc.
4 * Copyright (c) 1999-2001 Motorola, Inc.
5 * Copyright (c) 2001-2002 Intel Corp.
6 *
7 * This file is part of the SCTP kernel implementation
8 *
9 * These functions work with the state functions in sctp_sm_statefuns.c
10 * to implement the state operations. These functions implement the
11 * steps which require modifying existing data structures.
12 *
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us>
40 * C. Robin <chris@hundredacre.ac.uk>
41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Xingang Guo <xingang.guo@intel.com>
43 * Dajiang Zhang <dajiang.zhang@nokia.com>
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Daisy Chang <daisyc@us.ibm.com>
46 * Ardelle Fan <ardelle.fan@intel.com>
47 * Kevin Gao <kevin.gao@intel.com>
48 *
49 * Any bugs reported given to us we will try to fix... any fixes shared will
50 * be incorporated into the next SCTP release.
51 */
52
53 #include <linux/types.h>
54 #include <linux/kernel.h>
55 #include <linux/ip.h>
56 #include <linux/ipv6.h>
57 #include <linux/net.h>
58 #include <linux/inet.h>
59 #include <linux/scatterlist.h>
60 #include <linux/crypto.h>
61 #include <linux/slab.h>
62 #include <net/sock.h>
63
64 #include <linux/skbuff.h>
65 #include <linux/random.h> /* for get_random_bytes */
66 #include <net/sctp/sctp.h>
67 #include <net/sctp/sm.h>
68
69 SCTP_STATIC
70 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
71 __u8 type, __u8 flags, int paylen);
72 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
73 const struct sctp_association *asoc,
74 const struct sctp_chunk *init_chunk,
75 int *cookie_len,
76 const __u8 *raw_addrs, int addrs_len);
77 static int sctp_process_param(struct sctp_association *asoc,
78 union sctp_params param,
79 const union sctp_addr *peer_addr,
80 gfp_t gfp);
81 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
82 const void *data);
83
84 /* What was the inbound interface for this chunk? */
85 int sctp_chunk_iif(const struct sctp_chunk *chunk)
86 {
87 struct sctp_af *af;
88 int iif = 0;
89
90 af = sctp_get_af_specific(ipver2af(ip_hdr(chunk->skb)->version));
91 if (af)
92 iif = af->skb_iif(chunk->skb);
93
94 return iif;
95 }
96
97 /* RFC 2960 3.3.2 Initiation (INIT) (1)
98 *
99 * Note 2: The ECN capable field is reserved for future use of
100 * Explicit Congestion Notification.
101 */
102 static const struct sctp_paramhdr ecap_param = {
103 SCTP_PARAM_ECN_CAPABLE,
104 cpu_to_be16(sizeof(struct sctp_paramhdr)),
105 };
106 static const struct sctp_paramhdr prsctp_param = {
107 SCTP_PARAM_FWD_TSN_SUPPORT,
108 cpu_to_be16(sizeof(struct sctp_paramhdr)),
109 };
110
111 /* A helper to initialize an op error inside a
112 * provided chunk, as most cause codes will be embedded inside an
113 * abort chunk.
114 */
115 void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
116 size_t paylen)
117 {
118 sctp_errhdr_t err;
119 __u16 len;
120
121 /* Cause code constants are now defined in network order. */
122 err.cause = cause_code;
123 len = sizeof(sctp_errhdr_t) + paylen;
124 err.length = htons(len);
125 chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
126 }
127
128 /* A helper to initialize an op error inside a
129 * provided chunk, as most cause codes will be embedded inside an
130 * abort chunk. Differs from sctp_init_cause in that it won't oops
131 * if there isn't enough space in the op error chunk
132 */
133 int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code,
134 size_t paylen)
135 {
136 sctp_errhdr_t err;
137 __u16 len;
138
139 /* Cause code constants are now defined in network order. */
140 err.cause = cause_code;
141 len = sizeof(sctp_errhdr_t) + paylen;
142 err.length = htons(len);
143
144 if (skb_tailroom(chunk->skb) < len)
145 return -ENOSPC;
146 chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk,
147 sizeof(sctp_errhdr_t),
148 &err);
149 return 0;
150 }
151 /* 3.3.2 Initiation (INIT) (1)
152 *
153 * This chunk is used to initiate a SCTP association between two
154 * endpoints. The format of the INIT chunk is shown below:
155 *
156 * 0 1 2 3
157 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
158 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
159 * | Type = 1 | Chunk Flags | Chunk Length |
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | Initiate Tag |
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
163 * | Advertised Receiver Window Credit (a_rwnd) |
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 * | Number of Outbound Streams | Number of Inbound Streams |
166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
167 * | Initial TSN |
168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 * \ \
170 * / Optional/Variable-Length Parameters /
171 * \ \
172 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
173 *
174 *
175 * The INIT chunk contains the following parameters. Unless otherwise
176 * noted, each parameter MUST only be included once in the INIT chunk.
177 *
178 * Fixed Parameters Status
179 * ----------------------------------------------
180 * Initiate Tag Mandatory
181 * Advertised Receiver Window Credit Mandatory
182 * Number of Outbound Streams Mandatory
183 * Number of Inbound Streams Mandatory
184 * Initial TSN Mandatory
185 *
186 * Variable Parameters Status Type Value
187 * -------------------------------------------------------------
188 * IPv4 Address (Note 1) Optional 5
189 * IPv6 Address (Note 1) Optional 6
190 * Cookie Preservative Optional 9
191 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
192 * Host Name Address (Note 3) Optional 11
193 * Supported Address Types (Note 4) Optional 12
194 */
195 struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
196 const struct sctp_bind_addr *bp,
197 gfp_t gfp, int vparam_len)
198 {
199 sctp_inithdr_t init;
200 union sctp_params addrs;
201 size_t chunksize;
202 struct sctp_chunk *retval = NULL;
203 int num_types, addrs_len = 0;
204 struct sctp_sock *sp;
205 sctp_supported_addrs_param_t sat;
206 __be16 types[2];
207 sctp_adaptation_ind_param_t aiparam;
208 sctp_supported_ext_param_t ext_param;
209 int num_ext = 0;
210 __u8 extensions[3];
211 sctp_paramhdr_t *auth_chunks = NULL,
212 *auth_hmacs = NULL;
213
214 /* RFC 2960 3.3.2 Initiation (INIT) (1)
215 *
216 * Note 1: The INIT chunks can contain multiple addresses that
217 * can be IPv4 and/or IPv6 in any combination.
218 */
219 retval = NULL;
220
221 /* Convert the provided bind address list to raw format. */
222 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
223
224 init.init_tag = htonl(asoc->c.my_vtag);
225 init.a_rwnd = htonl(asoc->rwnd);
226 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
227 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
228 init.initial_tsn = htonl(asoc->c.initial_tsn);
229
230 /* How many address types are needed? */
231 sp = sctp_sk(asoc->base.sk);
232 num_types = sp->pf->supported_addrs(sp, types);
233
234 chunksize = sizeof(init) + addrs_len;
235 chunksize += WORD_ROUND(SCTP_SAT_LEN(num_types));
236 chunksize += sizeof(ecap_param);
237
238 if (sctp_prsctp_enable)
239 chunksize += sizeof(prsctp_param);
240
241 /* ADDIP: Section 4.2.7:
242 * An implementation supporting this extension [ADDIP] MUST list
243 * the ASCONF,the ASCONF-ACK, and the AUTH chunks in its INIT and
244 * INIT-ACK parameters.
245 */
246 if (sctp_addip_enable) {
247 extensions[num_ext] = SCTP_CID_ASCONF;
248 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
249 num_ext += 2;
250 }
251
252 if (sp->adaptation_ind)
253 chunksize += sizeof(aiparam);
254
255 chunksize += vparam_len;
256
257 /* Account for AUTH related parameters */
258 if (sctp_auth_enable) {
259 /* Add random parameter length*/
260 chunksize += sizeof(asoc->c.auth_random);
261
262 /* Add HMACS parameter length if any were defined */
263 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
264 if (auth_hmacs->length)
265 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
266 else
267 auth_hmacs = NULL;
268
269 /* Add CHUNKS parameter length */
270 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
271 if (auth_chunks->length)
272 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
273 else
274 auth_chunks = NULL;
275
276 extensions[num_ext] = SCTP_CID_AUTH;
277 num_ext += 1;
278 }
279
280 /* If we have any extensions to report, account for that */
281 if (num_ext)
282 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
283 num_ext);
284
285 /* RFC 2960 3.3.2 Initiation (INIT) (1)
286 *
287 * Note 3: An INIT chunk MUST NOT contain more than one Host
288 * Name address parameter. Moreover, the sender of the INIT
289 * MUST NOT combine any other address types with the Host Name
290 * address in the INIT. The receiver of INIT MUST ignore any
291 * other address types if the Host Name address parameter is
292 * present in the received INIT chunk.
293 *
294 * PLEASE DO NOT FIXME [This version does not support Host Name.]
295 */
296
297 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
298 if (!retval)
299 goto nodata;
300
301 retval->subh.init_hdr =
302 sctp_addto_chunk(retval, sizeof(init), &init);
303 retval->param_hdr.v =
304 sctp_addto_chunk(retval, addrs_len, addrs.v);
305
306 /* RFC 2960 3.3.2 Initiation (INIT) (1)
307 *
308 * Note 4: This parameter, when present, specifies all the
309 * address types the sending endpoint can support. The absence
310 * of this parameter indicates that the sending endpoint can
311 * support any address type.
312 */
313 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
314 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
315 sctp_addto_chunk(retval, sizeof(sat), &sat);
316 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
317
318 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
319
320 /* Add the supported extensions parameter. Be nice and add this
321 * fist before addiding the parameters for the extensions themselves
322 */
323 if (num_ext) {
324 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
325 ext_param.param_hdr.length =
326 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
327 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
328 &ext_param);
329 sctp_addto_param(retval, num_ext, extensions);
330 }
331
332 if (sctp_prsctp_enable)
333 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
334
335 if (sp->adaptation_ind) {
336 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
337 aiparam.param_hdr.length = htons(sizeof(aiparam));
338 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
339 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
340 }
341
342 /* Add SCTP-AUTH chunks to the parameter list */
343 if (sctp_auth_enable) {
344 sctp_addto_chunk(retval, sizeof(asoc->c.auth_random),
345 asoc->c.auth_random);
346 if (auth_hmacs)
347 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
348 auth_hmacs);
349 if (auth_chunks)
350 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
351 auth_chunks);
352 }
353 nodata:
354 kfree(addrs.v);
355 return retval;
356 }
357
358 struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
359 const struct sctp_chunk *chunk,
360 gfp_t gfp, int unkparam_len)
361 {
362 sctp_inithdr_t initack;
363 struct sctp_chunk *retval;
364 union sctp_params addrs;
365 struct sctp_sock *sp;
366 int addrs_len;
367 sctp_cookie_param_t *cookie;
368 int cookie_len;
369 size_t chunksize;
370 sctp_adaptation_ind_param_t aiparam;
371 sctp_supported_ext_param_t ext_param;
372 int num_ext = 0;
373 __u8 extensions[3];
374 sctp_paramhdr_t *auth_chunks = NULL,
375 *auth_hmacs = NULL,
376 *auth_random = NULL;
377
378 retval = NULL;
379
380 /* Note: there may be no addresses to embed. */
381 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
382
383 initack.init_tag = htonl(asoc->c.my_vtag);
384 initack.a_rwnd = htonl(asoc->rwnd);
385 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
386 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
387 initack.initial_tsn = htonl(asoc->c.initial_tsn);
388
389 /* FIXME: We really ought to build the cookie right
390 * into the packet instead of allocating more fresh memory.
391 */
392 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
393 addrs.v, addrs_len);
394 if (!cookie)
395 goto nomem_cookie;
396
397 /* Calculate the total size of allocation, include the reserved
398 * space for reporting unknown parameters if it is specified.
399 */
400 sp = sctp_sk(asoc->base.sk);
401 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
402
403 /* Tell peer that we'll do ECN only if peer advertised such cap. */
404 if (asoc->peer.ecn_capable)
405 chunksize += sizeof(ecap_param);
406
407 if (asoc->peer.prsctp_capable)
408 chunksize += sizeof(prsctp_param);
409
410 if (asoc->peer.asconf_capable) {
411 extensions[num_ext] = SCTP_CID_ASCONF;
412 extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;
413 num_ext += 2;
414 }
415
416 if (sp->adaptation_ind)
417 chunksize += sizeof(aiparam);
418
419 if (asoc->peer.auth_capable) {
420 auth_random = (sctp_paramhdr_t *)asoc->c.auth_random;
421 chunksize += ntohs(auth_random->length);
422
423 auth_hmacs = (sctp_paramhdr_t *)asoc->c.auth_hmacs;
424 if (auth_hmacs->length)
425 chunksize += WORD_ROUND(ntohs(auth_hmacs->length));
426 else
427 auth_hmacs = NULL;
428
429 auth_chunks = (sctp_paramhdr_t *)asoc->c.auth_chunks;
430 if (auth_chunks->length)
431 chunksize += WORD_ROUND(ntohs(auth_chunks->length));
432 else
433 auth_chunks = NULL;
434
435 extensions[num_ext] = SCTP_CID_AUTH;
436 num_ext += 1;
437 }
438
439 if (num_ext)
440 chunksize += WORD_ROUND(sizeof(sctp_supported_ext_param_t) +
441 num_ext);
442
443 /* Now allocate and fill out the chunk. */
444 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
445 if (!retval)
446 goto nomem_chunk;
447
448 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
449 *
450 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
451 * HEARTBEAT ACK, * etc.) to the same destination transport
452 * address from which it received the DATA or control chunk
453 * to which it is replying.
454 *
455 * [INIT ACK back to where the INIT came from.]
456 */
457 retval->transport = chunk->transport;
458
459 retval->subh.init_hdr =
460 sctp_addto_chunk(retval, sizeof(initack), &initack);
461 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
462 sctp_addto_chunk(retval, cookie_len, cookie);
463 if (asoc->peer.ecn_capable)
464 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
465 if (num_ext) {
466 ext_param.param_hdr.type = SCTP_PARAM_SUPPORTED_EXT;
467 ext_param.param_hdr.length =
468 htons(sizeof(sctp_supported_ext_param_t) + num_ext);
469 sctp_addto_chunk(retval, sizeof(sctp_supported_ext_param_t),
470 &ext_param);
471 sctp_addto_param(retval, num_ext, extensions);
472 }
473 if (asoc->peer.prsctp_capable)
474 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
475
476 if (sp->adaptation_ind) {
477 aiparam.param_hdr.type = SCTP_PARAM_ADAPTATION_LAYER_IND;
478 aiparam.param_hdr.length = htons(sizeof(aiparam));
479 aiparam.adaptation_ind = htonl(sp->adaptation_ind);
480 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
481 }
482
483 if (asoc->peer.auth_capable) {
484 sctp_addto_chunk(retval, ntohs(auth_random->length),
485 auth_random);
486 if (auth_hmacs)
487 sctp_addto_chunk(retval, ntohs(auth_hmacs->length),
488 auth_hmacs);
489 if (auth_chunks)
490 sctp_addto_chunk(retval, ntohs(auth_chunks->length),
491 auth_chunks);
492 }
493
494 /* We need to remove the const qualifier at this point. */
495 retval->asoc = (struct sctp_association *) asoc;
496
497 nomem_chunk:
498 kfree(cookie);
499 nomem_cookie:
500 kfree(addrs.v);
501 return retval;
502 }
503
504 /* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
505 *
506 * This chunk is used only during the initialization of an association.
507 * It is sent by the initiator of an association to its peer to complete
508 * the initialization process. This chunk MUST precede any DATA chunk
509 * sent within the association, but MAY be bundled with one or more DATA
510 * chunks in the same packet.
511 *
512 * 0 1 2 3
513 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
514 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
515 * | Type = 10 |Chunk Flags | Length |
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * / Cookie /
518 * \ \
519 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
520 *
521 * Chunk Flags: 8 bit
522 *
523 * Set to zero on transmit and ignored on receipt.
524 *
525 * Length: 16 bits (unsigned integer)
526 *
527 * Set to the size of the chunk in bytes, including the 4 bytes of
528 * the chunk header and the size of the Cookie.
529 *
530 * Cookie: variable size
531 *
532 * This field must contain the exact cookie received in the
533 * State Cookie parameter from the previous INIT ACK.
534 *
535 * An implementation SHOULD make the cookie as small as possible
536 * to insure interoperability.
537 */
538 struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
539 const struct sctp_chunk *chunk)
540 {
541 struct sctp_chunk *retval;
542 void *cookie;
543 int cookie_len;
544
545 cookie = asoc->peer.cookie;
546 cookie_len = asoc->peer.cookie_len;
547
548 /* Build a cookie echo chunk. */
549 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
550 if (!retval)
551 goto nodata;
552 retval->subh.cookie_hdr =
553 sctp_addto_chunk(retval, cookie_len, cookie);
554
555 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
556 *
557 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
558 * HEARTBEAT ACK, * etc.) to the same destination transport
559 * address from which it * received the DATA or control chunk
560 * to which it is replying.
561 *
562 * [COOKIE ECHO back to where the INIT ACK came from.]
563 */
564 if (chunk)
565 retval->transport = chunk->transport;
566
567 nodata:
568 return retval;
569 }
570
571 /* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
572 *
573 * This chunk is used only during the initialization of an
574 * association. It is used to acknowledge the receipt of a COOKIE
575 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
576 * within the association, but MAY be bundled with one or more DATA
577 * chunks or SACK chunk in the same SCTP packet.
578 *
579 * 0 1 2 3
580 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
581 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
582 * | Type = 11 |Chunk Flags | Length = 4 |
583 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
584 *
585 * Chunk Flags: 8 bits
586 *
587 * Set to zero on transmit and ignored on receipt.
588 */
589 struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
590 const struct sctp_chunk *chunk)
591 {
592 struct sctp_chunk *retval;
593
594 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
595
596 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
597 *
598 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
599 * HEARTBEAT ACK, * etc.) to the same destination transport
600 * address from which it * received the DATA or control chunk
601 * to which it is replying.
602 *
603 * [COOKIE ACK back to where the COOKIE ECHO came from.]
604 */
605 if (retval && chunk)
606 retval->transport = chunk->transport;
607
608 return retval;
609 }
610
611 /*
612 * Appendix A: Explicit Congestion Notification:
613 * CWR:
614 *
615 * RFC 2481 details a specific bit for a sender to send in the header of
616 * its next outbound TCP segment to indicate to its peer that it has
617 * reduced its congestion window. This is termed the CWR bit. For
618 * SCTP the same indication is made by including the CWR chunk.
619 * This chunk contains one data element, i.e. the TSN number that
620 * was sent in the ECNE chunk. This element represents the lowest
621 * TSN number in the datagram that was originally marked with the
622 * CE bit.
623 *
624 * 0 1 2 3
625 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
626 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
627 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
628 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
629 * | Lowest TSN Number |
630 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
631 *
632 * Note: The CWR is considered a Control chunk.
633 */
634 struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
635 const __u32 lowest_tsn,
636 const struct sctp_chunk *chunk)
637 {
638 struct sctp_chunk *retval;
639 sctp_cwrhdr_t cwr;
640
641 cwr.lowest_tsn = htonl(lowest_tsn);
642 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
643 sizeof(sctp_cwrhdr_t));
644
645 if (!retval)
646 goto nodata;
647
648 retval->subh.ecn_cwr_hdr =
649 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
650
651 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
652 *
653 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
654 * HEARTBEAT ACK, * etc.) to the same destination transport
655 * address from which it * received the DATA or control chunk
656 * to which it is replying.
657 *
658 * [Report a reduced congestion window back to where the ECNE
659 * came from.]
660 */
661 if (chunk)
662 retval->transport = chunk->transport;
663
664 nodata:
665 return retval;
666 }
667
668 /* Make an ECNE chunk. This is a congestion experienced report. */
669 struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
670 const __u32 lowest_tsn)
671 {
672 struct sctp_chunk *retval;
673 sctp_ecnehdr_t ecne;
674
675 ecne.lowest_tsn = htonl(lowest_tsn);
676 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
677 sizeof(sctp_ecnehdr_t));
678 if (!retval)
679 goto nodata;
680 retval->subh.ecne_hdr =
681 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
682
683 nodata:
684 return retval;
685 }
686
687 /* Make a DATA chunk for the given association from the provided
688 * parameters. However, do not populate the data payload.
689 */
690 struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
691 const struct sctp_sndrcvinfo *sinfo,
692 int data_len, __u8 flags, __u16 ssn)
693 {
694 struct sctp_chunk *retval;
695 struct sctp_datahdr dp;
696 int chunk_len;
697
698 /* We assign the TSN as LATE as possible, not here when
699 * creating the chunk.
700 */
701 dp.tsn = 0;
702 dp.stream = htons(sinfo->sinfo_stream);
703 dp.ppid = sinfo->sinfo_ppid;
704
705 /* Set the flags for an unordered send. */
706 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
707 flags |= SCTP_DATA_UNORDERED;
708 dp.ssn = 0;
709 } else
710 dp.ssn = htons(ssn);
711
712 chunk_len = sizeof(dp) + data_len;
713 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
714 if (!retval)
715 goto nodata;
716
717 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
718 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
719
720 nodata:
721 return retval;
722 }
723
724 /* Create a selective ackowledgement (SACK) for the given
725 * association. This reports on which TSN's we've seen to date,
726 * including duplicates and gaps.
727 */
728 struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
729 {
730 struct sctp_chunk *retval;
731 struct sctp_sackhdr sack;
732 int len;
733 __u32 ctsn;
734 __u16 num_gabs, num_dup_tsns;
735 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
736 struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
737
738 memset(gabs, 0, sizeof(gabs));
739 ctsn = sctp_tsnmap_get_ctsn(map);
740 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
741
742 /* How much room is needed in the chunk? */
743 num_gabs = sctp_tsnmap_num_gabs(map, gabs);
744 num_dup_tsns = sctp_tsnmap_num_dups(map);
745
746 /* Initialize the SACK header. */
747 sack.cum_tsn_ack = htonl(ctsn);
748 sack.a_rwnd = htonl(asoc->a_rwnd);
749 sack.num_gap_ack_blocks = htons(num_gabs);
750 sack.num_dup_tsns = htons(num_dup_tsns);
751
752 len = sizeof(sack)
753 + sizeof(struct sctp_gap_ack_block) * num_gabs
754 + sizeof(__u32) * num_dup_tsns;
755
756 /* Create the chunk. */
757 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
758 if (!retval)
759 goto nodata;
760
761 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
762 *
763 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
764 * HEARTBEAT ACK, etc.) to the same destination transport
765 * address from which it received the DATA or control chunk to
766 * which it is replying. This rule should also be followed if
767 * the endpoint is bundling DATA chunks together with the
768 * reply chunk.
769 *
770 * However, when acknowledging multiple DATA chunks received
771 * in packets from different source addresses in a single
772 * SACK, the SACK chunk may be transmitted to one of the
773 * destination transport addresses from which the DATA or
774 * control chunks being acknowledged were received.
775 *
776 * [BUG: We do not implement the following paragraph.
777 * Perhaps we should remember the last transport we used for a
778 * SACK and avoid that (if possible) if we have seen any
779 * duplicates. --piggy]
780 *
781 * When a receiver of a duplicate DATA chunk sends a SACK to a
782 * multi- homed endpoint it MAY be beneficial to vary the
783 * destination address and not use the source address of the
784 * DATA chunk. The reason being that receiving a duplicate
785 * from a multi-homed endpoint might indicate that the return
786 * path (as specified in the source address of the DATA chunk)
787 * for the SACK is broken.
788 *
789 * [Send to the address from which we last received a DATA chunk.]
790 */
791 retval->transport = asoc->peer.last_data_from;
792
793 retval->subh.sack_hdr =
794 sctp_addto_chunk(retval, sizeof(sack), &sack);
795
796 /* Add the gap ack block information. */
797 if (num_gabs)
798 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
799 gabs);
800
801 /* Add the duplicate TSN information. */
802 if (num_dup_tsns)
803 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
804 sctp_tsnmap_get_dups(map));
805
806 nodata:
807 return retval;
808 }
809
810 /* Make a SHUTDOWN chunk. */
811 struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
812 const struct sctp_chunk *chunk)
813 {
814 struct sctp_chunk *retval;
815 sctp_shutdownhdr_t shut;
816 __u32 ctsn;
817
818 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
819 shut.cum_tsn_ack = htonl(ctsn);
820
821 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
822 sizeof(sctp_shutdownhdr_t));
823 if (!retval)
824 goto nodata;
825
826 retval->subh.shutdown_hdr =
827 sctp_addto_chunk(retval, sizeof(shut), &shut);
828
829 if (chunk)
830 retval->transport = chunk->transport;
831 nodata:
832 return retval;
833 }
834
835 struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
836 const struct sctp_chunk *chunk)
837 {
838 struct sctp_chunk *retval;
839
840 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
841
842 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
843 *
844 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
845 * HEARTBEAT ACK, * etc.) to the same destination transport
846 * address from which it * received the DATA or control chunk
847 * to which it is replying.
848 *
849 * [ACK back to where the SHUTDOWN came from.]
850 */
851 if (retval && chunk)
852 retval->transport = chunk->transport;
853
854 return retval;
855 }
856
857 struct sctp_chunk *sctp_make_shutdown_complete(
858 const struct sctp_association *asoc,
859 const struct sctp_chunk *chunk)
860 {
861 struct sctp_chunk *retval;
862 __u8 flags = 0;
863
864 /* Set the T-bit if we have no association (vtag will be
865 * reflected)
866 */
867 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
868
869 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
870
871 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
872 *
873 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
874 * HEARTBEAT ACK, * etc.) to the same destination transport
875 * address from which it * received the DATA or control chunk
876 * to which it is replying.
877 *
878 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
879 * came from.]
880 */
881 if (retval && chunk)
882 retval->transport = chunk->transport;
883
884 return retval;
885 }
886
887 /* Create an ABORT. Note that we set the T bit if we have no
888 * association, except when responding to an INIT (sctpimpguide 2.41).
889 */
890 struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
891 const struct sctp_chunk *chunk,
892 const size_t hint)
893 {
894 struct sctp_chunk *retval;
895 __u8 flags = 0;
896
897 /* Set the T-bit if we have no association and 'chunk' is not
898 * an INIT (vtag will be reflected).
899 */
900 if (!asoc) {
901 if (chunk && chunk->chunk_hdr &&
902 chunk->chunk_hdr->type == SCTP_CID_INIT)
903 flags = 0;
904 else
905 flags = SCTP_CHUNK_FLAG_T;
906 }
907
908 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
909
910 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
911 *
912 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
913 * HEARTBEAT ACK, * etc.) to the same destination transport
914 * address from which it * received the DATA or control chunk
915 * to which it is replying.
916 *
917 * [ABORT back to where the offender came from.]
918 */
919 if (retval && chunk)
920 retval->transport = chunk->transport;
921
922 return retval;
923 }
924
925 /* Helper to create ABORT with a NO_USER_DATA error. */
926 struct sctp_chunk *sctp_make_abort_no_data(
927 const struct sctp_association *asoc,
928 const struct sctp_chunk *chunk, __u32 tsn)
929 {
930 struct sctp_chunk *retval;
931 __be32 payload;
932
933 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
934 + sizeof(tsn));
935
936 if (!retval)
937 goto no_mem;
938
939 /* Put the tsn back into network byte order. */
940 payload = htonl(tsn);
941 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, sizeof(payload));
942 sctp_addto_chunk(retval, sizeof(payload), (const void *)&payload);
943
944 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
945 *
946 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
947 * HEARTBEAT ACK, * etc.) to the same destination transport
948 * address from which it * received the DATA or control chunk
949 * to which it is replying.
950 *
951 * [ABORT back to where the offender came from.]
952 */
953 if (chunk)
954 retval->transport = chunk->transport;
955
956 no_mem:
957 return retval;
958 }
959
960 /* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
961 struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
962 const struct msghdr *msg,
963 size_t paylen)
964 {
965 struct sctp_chunk *retval;
966 void *payload = NULL;
967 int err;
968
969 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
970 if (!retval)
971 goto err_chunk;
972
973 if (paylen) {
974 /* Put the msg_iov together into payload. */
975 payload = kmalloc(paylen, GFP_KERNEL);
976 if (!payload)
977 goto err_payload;
978
979 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
980 if (err < 0)
981 goto err_copy;
982 }
983
984 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, paylen);
985 sctp_addto_chunk(retval, paylen, payload);
986
987 if (paylen)
988 kfree(payload);
989
990 return retval;
991
992 err_copy:
993 kfree(payload);
994 err_payload:
995 sctp_chunk_free(retval);
996 retval = NULL;
997 err_chunk:
998 return retval;
999 }
1000
1001 /* Append bytes to the end of a parameter. Will panic if chunk is not big
1002 * enough.
1003 */
1004 static void *sctp_addto_param(struct sctp_chunk *chunk, int len,
1005 const void *data)
1006 {
1007 void *target;
1008 int chunklen = ntohs(chunk->chunk_hdr->length);
1009
1010 target = skb_put(chunk->skb, len);
1011
1012 if (data)
1013 memcpy(target, data, len);
1014 else
1015 memset(target, 0, len);
1016
1017 /* Adjust the chunk length field. */
1018 chunk->chunk_hdr->length = htons(chunklen + len);
1019 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1020
1021 return target;
1022 }
1023
1024 /* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
1025 struct sctp_chunk *sctp_make_abort_violation(
1026 const struct sctp_association *asoc,
1027 const struct sctp_chunk *chunk,
1028 const __u8 *payload,
1029 const size_t paylen)
1030 {
1031 struct sctp_chunk *retval;
1032 struct sctp_paramhdr phdr;
1033
1034 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
1035 + sizeof(sctp_paramhdr_t));
1036 if (!retval)
1037 goto end;
1038
1039 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, paylen
1040 + sizeof(sctp_paramhdr_t));
1041
1042 phdr.type = htons(chunk->chunk_hdr->type);
1043 phdr.length = chunk->chunk_hdr->length;
1044 sctp_addto_chunk(retval, paylen, payload);
1045 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), &phdr);
1046
1047 end:
1048 return retval;
1049 }
1050
1051 struct sctp_chunk *sctp_make_violation_paramlen(
1052 const struct sctp_association *asoc,
1053 const struct sctp_chunk *chunk,
1054 struct sctp_paramhdr *param)
1055 {
1056 struct sctp_chunk *retval;
1057 static const char error[] = "The following parameter had invalid length:";
1058 size_t payload_len = sizeof(error) + sizeof(sctp_errhdr_t) +
1059 sizeof(sctp_paramhdr_t);
1060
1061 retval = sctp_make_abort(asoc, chunk, payload_len);
1062 if (!retval)
1063 goto nodata;
1064
1065 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION,
1066 sizeof(error) + sizeof(sctp_paramhdr_t));
1067 sctp_addto_chunk(retval, sizeof(error), error);
1068 sctp_addto_param(retval, sizeof(sctp_paramhdr_t), param);
1069
1070 nodata:
1071 return retval;
1072 }
1073
1074 /* Make a HEARTBEAT chunk. */
1075 struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
1076 const struct sctp_transport *transport,
1077 const void *payload, const size_t paylen)
1078 {
1079 struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
1080 0, paylen);
1081
1082 if (!retval)
1083 goto nodata;
1084
1085 /* Cast away the 'const', as this is just telling the chunk
1086 * what transport it belongs to.
1087 */
1088 retval->transport = (struct sctp_transport *) transport;
1089 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1090
1091 nodata:
1092 return retval;
1093 }
1094
1095 struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
1096 const struct sctp_chunk *chunk,
1097 const void *payload, const size_t paylen)
1098 {
1099 struct sctp_chunk *retval;
1100
1101 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
1102 if (!retval)
1103 goto nodata;
1104
1105 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
1106
1107 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1108 *
1109 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1110 * HEARTBEAT ACK, * etc.) to the same destination transport
1111 * address from which it * received the DATA or control chunk
1112 * to which it is replying.
1113 *
1114 * [HBACK back to where the HEARTBEAT came from.]
1115 */
1116 if (chunk)
1117 retval->transport = chunk->transport;
1118
1119 nodata:
1120 return retval;
1121 }
1122
1123 /* Create an Operation Error chunk with the specified space reserved.
1124 * This routine can be used for containing multiple causes in the chunk.
1125 */
1126 static struct sctp_chunk *sctp_make_op_error_space(
1127 const struct sctp_association *asoc,
1128 const struct sctp_chunk *chunk,
1129 size_t size)
1130 {
1131 struct sctp_chunk *retval;
1132
1133 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
1134 sizeof(sctp_errhdr_t) + size);
1135 if (!retval)
1136 goto nodata;
1137
1138 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
1139 *
1140 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
1141 * HEARTBEAT ACK, etc.) to the same destination transport
1142 * address from which it received the DATA or control chunk
1143 * to which it is replying.
1144 *
1145 */
1146 if (chunk)
1147 retval->transport = chunk->transport;
1148
1149 nodata:
1150 return retval;
1151 }
1152
1153 /* Create an Operation Error chunk of a fixed size,
1154 * specifically, max(asoc->pathmtu, SCTP_DEFAULT_MAXSEGMENT)
1155 * This is a helper function to allocate an error chunk for
1156 * for those invalid parameter codes in which we may not want
1157 * to report all the errors, if the incomming chunk is large
1158 */
1159 static inline struct sctp_chunk *sctp_make_op_error_fixed(
1160 const struct sctp_association *asoc,
1161 const struct sctp_chunk *chunk)
1162 {
1163 size_t size = asoc ? asoc->pathmtu : 0;
1164
1165 if (!size)
1166 size = SCTP_DEFAULT_MAXSEGMENT;
1167
1168 return sctp_make_op_error_space(asoc, chunk, size);
1169 }
1170
1171 /* Create an Operation Error chunk. */
1172 struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
1173 const struct sctp_chunk *chunk,
1174 __be16 cause_code, const void *payload,
1175 size_t paylen, size_t reserve_tail)
1176 {
1177 struct sctp_chunk *retval;
1178
1179 retval = sctp_make_op_error_space(asoc, chunk, paylen + reserve_tail);
1180 if (!retval)
1181 goto nodata;
1182
1183 sctp_init_cause(retval, cause_code, paylen + reserve_tail);
1184 sctp_addto_chunk(retval, paylen, payload);
1185 if (reserve_tail)
1186 sctp_addto_param(retval, reserve_tail, NULL);
1187
1188 nodata:
1189 return retval;
1190 }
1191
1192 struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc)
1193 {
1194 struct sctp_chunk *retval;
1195 struct sctp_hmac *hmac_desc;
1196 struct sctp_authhdr auth_hdr;
1197 __u8 *hmac;
1198
1199 /* Get the first hmac that the peer told us to use */
1200 hmac_desc = sctp_auth_asoc_get_hmac(asoc);
1201 if (unlikely(!hmac_desc))
1202 return NULL;
1203
1204 retval = sctp_make_chunk(asoc, SCTP_CID_AUTH, 0,
1205 hmac_desc->hmac_len + sizeof(sctp_authhdr_t));
1206 if (!retval)
1207 return NULL;
1208
1209 auth_hdr.hmac_id = htons(hmac_desc->hmac_id);
1210 auth_hdr.shkey_id = htons(asoc->active_key_id);
1211
1212 retval->subh.auth_hdr = sctp_addto_chunk(retval, sizeof(sctp_authhdr_t),
1213 &auth_hdr);
1214
1215 hmac = skb_put(retval->skb, hmac_desc->hmac_len);
1216 memset(hmac, 0, hmac_desc->hmac_len);
1217
1218 /* Adjust the chunk header to include the empty MAC */
1219 retval->chunk_hdr->length =
1220 htons(ntohs(retval->chunk_hdr->length) + hmac_desc->hmac_len);
1221 retval->chunk_end = skb_tail_pointer(retval->skb);
1222
1223 return retval;
1224 }
1225
1226
1227 /********************************************************************
1228 * 2nd Level Abstractions
1229 ********************************************************************/
1230
1231 /* Turn an skb into a chunk.
1232 * FIXME: Eventually move the structure directly inside the skb->cb[].
1233 */
1234 struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
1235 const struct sctp_association *asoc,
1236 struct sock *sk)
1237 {
1238 struct sctp_chunk *retval;
1239
1240 retval = kmem_cache_zalloc(sctp_chunk_cachep, GFP_ATOMIC);
1241
1242 if (!retval)
1243 goto nodata;
1244
1245 if (!sk) {
1246 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
1247 }
1248
1249 INIT_LIST_HEAD(&retval->list);
1250 retval->skb = skb;
1251 retval->asoc = (struct sctp_association *)asoc;
1252 retval->has_tsn = 0;
1253 retval->has_ssn = 0;
1254 retval->rtt_in_progress = 0;
1255 retval->sent_at = 0;
1256 retval->singleton = 1;
1257 retval->end_of_packet = 0;
1258 retval->ecn_ce_done = 0;
1259 retval->pdiscard = 0;
1260
1261 /* sctpimpguide-05.txt Section 2.8.2
1262 * M1) Each time a new DATA chunk is transmitted
1263 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1264 * 'TSN.Missing.Report' count will be used to determine missing chunks
1265 * and when to fast retransmit.
1266 */
1267 retval->tsn_missing_report = 0;
1268 retval->tsn_gap_acked = 0;
1269 retval->fast_retransmit = SCTP_CAN_FRTX;
1270
1271 /* If this is a fragmented message, track all fragments
1272 * of the message (for SEND_FAILED).
1273 */
1274 retval->msg = NULL;
1275
1276 /* Polish the bead hole. */
1277 INIT_LIST_HEAD(&retval->transmitted_list);
1278 INIT_LIST_HEAD(&retval->frag_list);
1279 SCTP_DBG_OBJCNT_INC(chunk);
1280 atomic_set(&retval->refcnt, 1);
1281
1282 nodata:
1283 return retval;
1284 }
1285
1286 /* Set chunk->source and dest based on the IP header in chunk->skb. */
1287 void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1288 union sctp_addr *dest)
1289 {
1290 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1291 memcpy(&chunk->dest, dest, sizeof(union sctp_addr));
1292 }
1293
1294 /* Extract the source address from a chunk. */
1295 const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1296 {
1297 /* If we have a known transport, use that. */
1298 if (chunk->transport) {
1299 return &chunk->transport->ipaddr;
1300 } else {
1301 /* Otherwise, extract it from the IP header. */
1302 return &chunk->source;
1303 }
1304 }
1305
1306 /* Create a new chunk, setting the type and flags headers from the
1307 * arguments, reserving enough space for a 'paylen' byte payload.
1308 */
1309 SCTP_STATIC
1310 struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1311 __u8 type, __u8 flags, int paylen)
1312 {
1313 struct sctp_chunk *retval;
1314 sctp_chunkhdr_t *chunk_hdr;
1315 struct sk_buff *skb;
1316 struct sock *sk;
1317
1318 /* No need to allocate LL here, as this is only a chunk. */
1319 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1320 GFP_ATOMIC);
1321 if (!skb)
1322 goto nodata;
1323
1324 /* Make room for the chunk header. */
1325 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1326 chunk_hdr->type = type;
1327 chunk_hdr->flags = flags;
1328 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1329
1330 sk = asoc ? asoc->base.sk : NULL;
1331 retval = sctp_chunkify(skb, asoc, sk);
1332 if (!retval) {
1333 kfree_skb(skb);
1334 goto nodata;
1335 }
1336
1337 retval->chunk_hdr = chunk_hdr;
1338 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1339
1340 /* Determine if the chunk needs to be authenticated */
1341 if (sctp_auth_send_cid(type, asoc))
1342 retval->auth = 1;
1343
1344 /* Set the skb to the belonging sock for accounting. */
1345 skb->sk = sk;
1346
1347 return retval;
1348 nodata:
1349 return NULL;
1350 }
1351
1352
1353 /* Release the memory occupied by a chunk. */
1354 static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1355 {
1356 BUG_ON(!list_empty(&chunk->list));
1357 list_del_init(&chunk->transmitted_list);
1358
1359 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1360 dev_kfree_skb(chunk->skb);
1361
1362 SCTP_DBG_OBJCNT_DEC(chunk);
1363 kmem_cache_free(sctp_chunk_cachep, chunk);
1364 }
1365
1366 /* Possibly, free the chunk. */
1367 void sctp_chunk_free(struct sctp_chunk *chunk)
1368 {
1369 /* Release our reference on the message tracker. */
1370 if (chunk->msg)
1371 sctp_datamsg_put(chunk->msg);
1372
1373 sctp_chunk_put(chunk);
1374 }
1375
1376 /* Grab a reference to the chunk. */
1377 void sctp_chunk_hold(struct sctp_chunk *ch)
1378 {
1379 atomic_inc(&ch->refcnt);
1380 }
1381
1382 /* Release a reference to the chunk. */
1383 void sctp_chunk_put(struct sctp_chunk *ch)
1384 {
1385 if (atomic_dec_and_test(&ch->refcnt))
1386 sctp_chunk_destroy(ch);
1387 }
1388
1389 /* Append bytes to the end of a chunk. Will panic if chunk is not big
1390 * enough.
1391 */
1392 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1393 {
1394 void *target;
1395 void *padding;
1396 int chunklen = ntohs(chunk->chunk_hdr->length);
1397 int padlen = WORD_ROUND(chunklen) - chunklen;
1398
1399 padding = skb_put(chunk->skb, padlen);
1400 target = skb_put(chunk->skb, len);
1401
1402 memset(padding, 0, padlen);
1403 memcpy(target, data, len);
1404
1405 /* Adjust the chunk length field. */
1406 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1407 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1408
1409 return target;
1410 }
1411
1412 /* Append bytes to the end of a chunk. Returns NULL if there isn't sufficient
1413 * space in the chunk
1414 */
1415 void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk,
1416 int len, const void *data)
1417 {
1418 if (skb_tailroom(chunk->skb) >= len)
1419 return sctp_addto_chunk(chunk, len, data);
1420 else
1421 return NULL;
1422 }
1423
1424 /* Append bytes from user space to the end of a chunk. Will panic if
1425 * chunk is not big enough.
1426 * Returns a kernel err value.
1427 */
1428 int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1429 struct iovec *data)
1430 {
1431 __u8 *target;
1432 int err = 0;
1433
1434 /* Make room in chunk for data. */
1435 target = skb_put(chunk->skb, len);
1436
1437 /* Copy data (whole iovec) into chunk */
1438 if ((err = memcpy_fromiovecend(target, data, off, len)))
1439 goto out;
1440
1441 /* Adjust the chunk length field. */
1442 chunk->chunk_hdr->length =
1443 htons(ntohs(chunk->chunk_hdr->length) + len);
1444 chunk->chunk_end = skb_tail_pointer(chunk->skb);
1445
1446 out:
1447 return err;
1448 }
1449
1450 /* Helper function to assign a TSN if needed. This assumes that both
1451 * the data_hdr and association have already been assigned.
1452 */
1453 void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1454 {
1455 struct sctp_datamsg *msg;
1456 struct sctp_chunk *lchunk;
1457 struct sctp_stream *stream;
1458 __u16 ssn;
1459 __u16 sid;
1460
1461 if (chunk->has_ssn)
1462 return;
1463
1464 /* All fragments will be on the same stream */
1465 sid = ntohs(chunk->subh.data_hdr->stream);
1466 stream = &chunk->asoc->ssnmap->out;
1467
1468 /* Now assign the sequence number to the entire message.
1469 * All fragments must have the same stream sequence number.
1470 */
1471 msg = chunk->msg;
1472 list_for_each_entry(lchunk, &msg->chunks, frag_list) {
1473 if (lchunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1474 ssn = 0;
1475 } else {
1476 if (lchunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1477 ssn = sctp_ssn_next(stream, sid);
1478 else
1479 ssn = sctp_ssn_peek(stream, sid);
1480 }
1481
1482 lchunk->subh.data_hdr->ssn = htons(ssn);
1483 lchunk->has_ssn = 1;
1484 }
1485 }
1486
1487 /* Helper function to assign a TSN if needed. This assumes that both
1488 * the data_hdr and association have already been assigned.
1489 */
1490 void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1491 {
1492 if (!chunk->has_tsn) {
1493 /* This is the last possible instant to
1494 * assign a TSN.
1495 */
1496 chunk->subh.data_hdr->tsn =
1497 htonl(sctp_association_get_next_tsn(chunk->asoc));
1498 chunk->has_tsn = 1;
1499 }
1500 }
1501
1502 /* Create a CLOSED association to use with an incoming packet. */
1503 struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
1504 struct sctp_chunk *chunk,
1505 gfp_t gfp)
1506 {
1507 struct sctp_association *asoc;
1508 struct sk_buff *skb;
1509 sctp_scope_t scope;
1510 struct sctp_af *af;
1511
1512 /* Create the bare association. */
1513 scope = sctp_scope(sctp_source(chunk));
1514 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1515 if (!asoc)
1516 goto nodata;
1517 asoc->temp = 1;
1518 skb = chunk->skb;
1519 /* Create an entry for the source address of the packet. */
1520 af = sctp_get_af_specific(ipver2af(ip_hdr(skb)->version));
1521 if (unlikely(!af))
1522 goto fail;
1523 af->from_skb(&asoc->c.peer_addr, skb, 1);
1524 nodata:
1525 return asoc;
1526
1527 fail:
1528 sctp_association_free(asoc);
1529 return NULL;
1530 }
1531
1532 /* Build a cookie representing asoc.
1533 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1534 */
1535 static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1536 const struct sctp_association *asoc,
1537 const struct sctp_chunk *init_chunk,
1538 int *cookie_len,
1539 const __u8 *raw_addrs, int addrs_len)
1540 {
1541 sctp_cookie_param_t *retval;
1542 struct sctp_signed_cookie *cookie;
1543 struct scatterlist sg;
1544 int headersize, bodysize;
1545 unsigned int keylen;
1546 char *key;
1547
1548 /* Header size is static data prior to the actual cookie, including
1549 * any padding.
1550 */
1551 headersize = sizeof(sctp_paramhdr_t) +
1552 (sizeof(struct sctp_signed_cookie) -
1553 sizeof(struct sctp_cookie));
1554 bodysize = sizeof(struct sctp_cookie)
1555 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1556
1557 /* Pad out the cookie to a multiple to make the signature
1558 * functions simpler to write.
1559 */
1560 if (bodysize % SCTP_COOKIE_MULTIPLE)
1561 bodysize += SCTP_COOKIE_MULTIPLE
1562 - (bodysize % SCTP_COOKIE_MULTIPLE);
1563 *cookie_len = headersize + bodysize;
1564
1565 /* Clear this memory since we are sending this data structure
1566 * out on the network.
1567 */
1568 retval = kzalloc(*cookie_len, GFP_ATOMIC);
1569 if (!retval)
1570 goto nodata;
1571
1572 cookie = (struct sctp_signed_cookie *) retval->body;
1573
1574 /* Set up the parameter header. */
1575 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1576 retval->p.length = htons(*cookie_len);
1577
1578 /* Copy the cookie part of the association itself. */
1579 cookie->c = asoc->c;
1580 /* Save the raw address list length in the cookie. */
1581 cookie->c.raw_addr_list_len = addrs_len;
1582
1583 /* Remember PR-SCTP capability. */
1584 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1585
1586 /* Save adaptation indication in the cookie. */
1587 cookie->c.adaptation_ind = asoc->peer.adaptation_ind;
1588
1589 /* Set an expiration time for the cookie. */
1590 do_gettimeofday(&cookie->c.expiration);
1591 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1592
1593 /* Copy the peer's init packet. */
1594 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1595 ntohs(init_chunk->chunk_hdr->length));
1596
1597 /* Copy the raw local address list of the association. */
1598 memcpy((__u8 *)&cookie->c.peer_init[0] +
1599 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1600
1601 if (sctp_sk(ep->base.sk)->hmac) {
1602 struct hash_desc desc;
1603
1604 /* Sign the message. */
1605 sg_init_one(&sg, &cookie->c, bodysize);
1606 keylen = SCTP_SECRET_SIZE;
1607 key = (char *)ep->secret_key[ep->current_key];
1608 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1609 desc.flags = 0;
1610
1611 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1612 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1613 goto free_cookie;
1614 }
1615
1616 return retval;
1617
1618 free_cookie:
1619 kfree(retval);
1620 nodata:
1621 *cookie_len = 0;
1622 return NULL;
1623 }
1624
1625 /* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1626 struct sctp_association *sctp_unpack_cookie(
1627 const struct sctp_endpoint *ep,
1628 const struct sctp_association *asoc,
1629 struct sctp_chunk *chunk, gfp_t gfp,
1630 int *error, struct sctp_chunk **errp)
1631 {
1632 struct sctp_association *retval = NULL;
1633 struct sctp_signed_cookie *cookie;
1634 struct sctp_cookie *bear_cookie;
1635 int headersize, bodysize, fixed_size;
1636 __u8 *digest = ep->digest;
1637 struct scatterlist sg;
1638 unsigned int keylen, len;
1639 char *key;
1640 sctp_scope_t scope;
1641 struct sk_buff *skb = chunk->skb;
1642 struct timeval tv;
1643 struct hash_desc desc;
1644
1645 /* Header size is static data prior to the actual cookie, including
1646 * any padding.
1647 */
1648 headersize = sizeof(sctp_chunkhdr_t) +
1649 (sizeof(struct sctp_signed_cookie) -
1650 sizeof(struct sctp_cookie));
1651 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1652 fixed_size = headersize + sizeof(struct sctp_cookie);
1653
1654 /* Verify that the chunk looks like it even has a cookie.
1655 * There must be enough room for our cookie and our peer's
1656 * INIT chunk.
1657 */
1658 len = ntohs(chunk->chunk_hdr->length);
1659 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1660 goto malformed;
1661
1662 /* Verify that the cookie has been padded out. */
1663 if (bodysize % SCTP_COOKIE_MULTIPLE)
1664 goto malformed;
1665
1666 /* Process the cookie. */
1667 cookie = chunk->subh.cookie_hdr;
1668 bear_cookie = &cookie->c;
1669
1670 if (!sctp_sk(ep->base.sk)->hmac)
1671 goto no_hmac;
1672
1673 /* Check the signature. */
1674 keylen = SCTP_SECRET_SIZE;
1675 sg_init_one(&sg, bear_cookie, bodysize);
1676 key = (char *)ep->secret_key[ep->current_key];
1677 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1678 desc.flags = 0;
1679
1680 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1681 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1682 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1683 *error = -SCTP_IERROR_NOMEM;
1684 goto fail;
1685 }
1686
1687 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1688 /* Try the previous key. */
1689 key = (char *)ep->secret_key[ep->last_key];
1690 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1691 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1692 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1693 *error = -SCTP_IERROR_NOMEM;
1694 goto fail;
1695 }
1696
1697 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1698 /* Yikes! Still bad signature! */
1699 *error = -SCTP_IERROR_BAD_SIG;
1700 goto fail;
1701 }
1702 }
1703
1704 no_hmac:
1705 /* IG Section 2.35.2:
1706 * 3) Compare the port numbers and the verification tag contained
1707 * within the COOKIE ECHO chunk to the actual port numbers and the
1708 * verification tag within the SCTP common header of the received
1709 * packet. If these values do not match the packet MUST be silently
1710 * discarded,
1711 */
1712 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1713 *error = -SCTP_IERROR_BAD_TAG;
1714 goto fail;
1715 }
1716
1717 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1718 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1719 *error = -SCTP_IERROR_BAD_PORTS;
1720 goto fail;
1721 }
1722
1723 /* Check to see if the cookie is stale. If there is already
1724 * an association, there is no need to check cookie's expiration
1725 * for init collision case of lost COOKIE ACK.
1726 * If skb has been timestamped, then use the stamp, otherwise
1727 * use current time. This introduces a small possibility that
1728 * that a cookie may be considered expired, but his would only slow
1729 * down the new association establishment instead of every packet.
1730 */
1731 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1732 skb_get_timestamp(skb, &tv);
1733 else
1734 do_gettimeofday(&tv);
1735
1736 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1737 /*
1738 * Section 3.3.10.3 Stale Cookie Error (3)
1739 *
1740 * Cause of error
1741 * ---------------
1742 * Stale Cookie Error: Indicates the receipt of a valid State
1743 * Cookie that has expired.
1744 */
1745 len = ntohs(chunk->chunk_hdr->length);
1746 *errp = sctp_make_op_error_space(asoc, chunk, len);
1747 if (*errp) {
1748 suseconds_t usecs = (tv.tv_sec -
1749 bear_cookie->expiration.tv_sec) * 1000000L +
1750 tv.tv_usec - bear_cookie->expiration.tv_usec;
1751 __be32 n = htonl(usecs);
1752
1753 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1754 sizeof(n));
1755 sctp_addto_chunk(*errp, sizeof(n), &n);
1756 *error = -SCTP_IERROR_STALE_COOKIE;
1757 } else
1758 *error = -SCTP_IERROR_NOMEM;
1759
1760 goto fail;
1761 }
1762
1763 /* Make a new base association. */
1764 scope = sctp_scope(sctp_source(chunk));
1765 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1766 if (!retval) {
1767 *error = -SCTP_IERROR_NOMEM;
1768 goto fail;
1769 }
1770
1771 /* Set up our peer's port number. */
1772 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1773
1774 /* Populate the association from the cookie. */
1775 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1776
1777 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1778 GFP_ATOMIC) < 0) {
1779 *error = -SCTP_IERROR_NOMEM;
1780 goto fail;
1781 }
1782
1783 /* Also, add the destination address. */
1784 if (list_empty(&retval->base.bind_addr.address_list)) {
1785 sctp_add_bind_addr(&retval->base.bind_addr, &chunk->dest,
1786 SCTP_ADDR_SRC, GFP_ATOMIC);
1787 }
1788
1789 retval->next_tsn = retval->c.initial_tsn;
1790 retval->ctsn_ack_point = retval->next_tsn - 1;
1791 retval->addip_serial = retval->c.initial_tsn;
1792 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1793 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1794 retval->peer.adaptation_ind = retval->c.adaptation_ind;
1795
1796 /* The INIT stuff will be done by the side effects. */
1797 return retval;
1798
1799 fail:
1800 if (retval)
1801 sctp_association_free(retval);
1802
1803 return NULL;
1804
1805 malformed:
1806 /* Yikes! The packet is either corrupt or deliberately
1807 * malformed.
1808 */
1809 *error = -SCTP_IERROR_MALFORMED;
1810 goto fail;
1811 }
1812
1813 /********************************************************************
1814 * 3rd Level Abstractions
1815 ********************************************************************/
1816
1817 struct __sctp_missing {
1818 __be32 num_missing;
1819 __be16 type;
1820 } __packed;
1821
1822 /*
1823 * Report a missing mandatory parameter.
1824 */
1825 static int sctp_process_missing_param(const struct sctp_association *asoc,
1826 sctp_param_t paramtype,
1827 struct sctp_chunk *chunk,
1828 struct sctp_chunk **errp)
1829 {
1830 struct __sctp_missing report;
1831 __u16 len;
1832
1833 len = WORD_ROUND(sizeof(report));
1834
1835 /* Make an ERROR chunk, preparing enough room for
1836 * returning multiple unknown parameters.
1837 */
1838 if (!*errp)
1839 *errp = sctp_make_op_error_space(asoc, chunk, len);
1840
1841 if (*errp) {
1842 report.num_missing = htonl(1);
1843 report.type = paramtype;
1844 sctp_init_cause(*errp, SCTP_ERROR_MISS_PARAM,
1845 sizeof(report));
1846 sctp_addto_chunk(*errp, sizeof(report), &report);
1847 }
1848
1849 /* Stop processing this chunk. */
1850 return 0;
1851 }
1852
1853 /* Report an Invalid Mandatory Parameter. */
1854 static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1855 struct sctp_chunk *chunk,
1856 struct sctp_chunk **errp)
1857 {
1858 /* Invalid Mandatory Parameter Error has no payload. */
1859
1860 if (!*errp)
1861 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1862
1863 if (*errp)
1864 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, 0);
1865
1866 /* Stop processing this chunk. */
1867 return 0;
1868 }
1869
1870 static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1871 struct sctp_paramhdr *param,
1872 const struct sctp_chunk *chunk,
1873 struct sctp_chunk **errp)
1874 {
1875 /* This is a fatal error. Any accumulated non-fatal errors are
1876 * not reported.
1877 */
1878 if (*errp)
1879 sctp_chunk_free(*errp);
1880
1881 /* Create an error chunk and fill it in with our payload. */
1882 *errp = sctp_make_violation_paramlen(asoc, chunk, param);
1883
1884 return 0;
1885 }
1886
1887
1888 /* Do not attempt to handle the HOST_NAME parm. However, do
1889 * send back an indicator to the peer.
1890 */
1891 static int sctp_process_hn_param(const struct sctp_association *asoc,
1892 union sctp_params param,
1893 struct sctp_chunk *chunk,
1894 struct sctp_chunk **errp)
1895 {
1896 __u16 len = ntohs(param.p->length);
1897
1898 /* Processing of the HOST_NAME parameter will generate an
1899 * ABORT. If we've accumulated any non-fatal errors, they
1900 * would be unrecognized parameters and we should not include
1901 * them in the ABORT.
1902 */
1903 if (*errp)
1904 sctp_chunk_free(*errp);
1905
1906 *errp = sctp_make_op_error_space(asoc, chunk, len);
1907
1908 if (*errp) {
1909 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED, len);
1910 sctp_addto_chunk(*errp, len, param.v);
1911 }
1912
1913 /* Stop processing this chunk. */
1914 return 0;
1915 }
1916
1917 static int sctp_verify_ext_param(union sctp_params param)
1918 {
1919 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1920 int have_auth = 0;
1921 int have_asconf = 0;
1922 int i;
1923
1924 for (i = 0; i < num_ext; i++) {
1925 switch (param.ext->chunks[i]) {
1926 case SCTP_CID_AUTH:
1927 have_auth = 1;
1928 break;
1929 case SCTP_CID_ASCONF:
1930 case SCTP_CID_ASCONF_ACK:
1931 have_asconf = 1;
1932 break;
1933 }
1934 }
1935
1936 /* ADD-IP Security: The draft requires us to ABORT or ignore the
1937 * INIT/INIT-ACK if ADD-IP is listed, but AUTH is not. Do this
1938 * only if ADD-IP is turned on and we are not backward-compatible
1939 * mode.
1940 */
1941 if (sctp_addip_noauth)
1942 return 1;
1943
1944 if (sctp_addip_enable && !have_auth && have_asconf)
1945 return 0;
1946
1947 return 1;
1948 }
1949
1950 static void sctp_process_ext_param(struct sctp_association *asoc,
1951 union sctp_params param)
1952 {
1953 __u16 num_ext = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
1954 int i;
1955
1956 for (i = 0; i < num_ext; i++) {
1957 switch (param.ext->chunks[i]) {
1958 case SCTP_CID_FWD_TSN:
1959 if (sctp_prsctp_enable &&
1960 !asoc->peer.prsctp_capable)
1961 asoc->peer.prsctp_capable = 1;
1962 break;
1963 case SCTP_CID_AUTH:
1964 /* if the peer reports AUTH, assume that he
1965 * supports AUTH.
1966 */
1967 if (sctp_auth_enable)
1968 asoc->peer.auth_capable = 1;
1969 break;
1970 case SCTP_CID_ASCONF:
1971 case SCTP_CID_ASCONF_ACK:
1972 if (sctp_addip_enable)
1973 asoc->peer.asconf_capable = 1;
1974 break;
1975 default:
1976 break;
1977 }
1978 }
1979 }
1980
1981 /* RFC 3.2.1 & the Implementers Guide 2.2.
1982 *
1983 * The Parameter Types are encoded such that the
1984 * highest-order two bits specify the action that must be
1985 * taken if the processing endpoint does not recognize the
1986 * Parameter Type.
1987 *
1988 * 00 - Stop processing this parameter; do not process any further
1989 * parameters within this chunk
1990 *
1991 * 01 - Stop processing this parameter, do not process any further
1992 * parameters within this chunk, and report the unrecognized
1993 * parameter in an 'Unrecognized Parameter' ERROR chunk.
1994 *
1995 * 10 - Skip this parameter and continue processing.
1996 *
1997 * 11 - Skip this parameter and continue processing but
1998 * report the unrecognized parameter in an
1999 * 'Unrecognized Parameter' ERROR chunk.
2000 *
2001 * Return value:
2002 * SCTP_IERROR_NO_ERROR - continue with the chunk
2003 * SCTP_IERROR_ERROR - stop and report an error.
2004 * SCTP_IERROR_NOMEME - out of memory.
2005 */
2006 static sctp_ierror_t sctp_process_unk_param(const struct sctp_association *asoc,
2007 union sctp_params param,
2008 struct sctp_chunk *chunk,
2009 struct sctp_chunk **errp)
2010 {
2011 int retval = SCTP_IERROR_NO_ERROR;
2012
2013 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
2014 case SCTP_PARAM_ACTION_DISCARD:
2015 retval = SCTP_IERROR_ERROR;
2016 break;
2017 case SCTP_PARAM_ACTION_SKIP:
2018 break;
2019 case SCTP_PARAM_ACTION_DISCARD_ERR:
2020 retval = SCTP_IERROR_ERROR;
2021 /* Fall through */
2022 case SCTP_PARAM_ACTION_SKIP_ERR:
2023 /* Make an ERROR chunk, preparing enough room for
2024 * returning multiple unknown parameters.
2025 */
2026 if (NULL == *errp)
2027 *errp = sctp_make_op_error_fixed(asoc, chunk);
2028
2029 if (*errp) {
2030 sctp_init_cause_fixed(*errp, SCTP_ERROR_UNKNOWN_PARAM,
2031 WORD_ROUND(ntohs(param.p->length)));
2032 sctp_addto_chunk_fixed(*errp,
2033 WORD_ROUND(ntohs(param.p->length)),
2034 param.v);
2035 } else {
2036 /* If there is no memory for generating the ERROR
2037 * report as specified, an ABORT will be triggered
2038 * to the peer and the association won't be
2039 * established.
2040 */
2041 retval = SCTP_IERROR_NOMEM;
2042 }
2043 break;
2044 default:
2045 break;
2046 }
2047
2048 return retval;
2049 }
2050
2051 /* Verify variable length parameters
2052 * Return values:
2053 * SCTP_IERROR_ABORT - trigger an ABORT
2054 * SCTP_IERROR_NOMEM - out of memory (abort)
2055 * SCTP_IERROR_ERROR - stop processing, trigger an ERROR
2056 * SCTP_IERROR_NO_ERROR - continue with the chunk
2057 */
2058 static sctp_ierror_t sctp_verify_param(const struct sctp_association *asoc,
2059 union sctp_params param,
2060 sctp_cid_t cid,
2061 struct sctp_chunk *chunk,
2062 struct sctp_chunk **err_chunk)
2063 {
2064 struct sctp_hmac_algo_param *hmacs;
2065 int retval = SCTP_IERROR_NO_ERROR;
2066 __u16 n_elt, id = 0;
2067 int i;
2068
2069 /* FIXME - This routine is not looking at each parameter per the
2070 * chunk type, i.e., unrecognized parameters should be further
2071 * identified based on the chunk id.
2072 */
2073
2074 switch (param.p->type) {
2075 case SCTP_PARAM_IPV4_ADDRESS:
2076 case SCTP_PARAM_IPV6_ADDRESS:
2077 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2078 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2079 case SCTP_PARAM_STATE_COOKIE:
2080 case SCTP_PARAM_HEARTBEAT_INFO:
2081 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2082 case SCTP_PARAM_ECN_CAPABLE:
2083 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2084 break;
2085
2086 case SCTP_PARAM_SUPPORTED_EXT:
2087 if (!sctp_verify_ext_param(param))
2088 return SCTP_IERROR_ABORT;
2089 break;
2090
2091 case SCTP_PARAM_SET_PRIMARY:
2092 if (sctp_addip_enable)
2093 break;
2094 goto fallthrough;
2095
2096 case SCTP_PARAM_HOST_NAME_ADDRESS:
2097 /* Tell the peer, we won't support this param. */
2098 sctp_process_hn_param(asoc, param, chunk, err_chunk);
2099 retval = SCTP_IERROR_ABORT;
2100 break;
2101
2102 case SCTP_PARAM_FWD_TSN_SUPPORT:
2103 if (sctp_prsctp_enable)
2104 break;
2105 goto fallthrough;
2106
2107 case SCTP_PARAM_RANDOM:
2108 if (!sctp_auth_enable)
2109 goto fallthrough;
2110
2111 /* SCTP-AUTH: Secion 6.1
2112 * If the random number is not 32 byte long the association
2113 * MUST be aborted. The ABORT chunk SHOULD contain the error
2114 * cause 'Protocol Violation'.
2115 */
2116 if (SCTP_AUTH_RANDOM_LENGTH !=
2117 ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) {
2118 sctp_process_inv_paramlength(asoc, param.p,
2119 chunk, err_chunk);
2120 retval = SCTP_IERROR_ABORT;
2121 }
2122 break;
2123
2124 case SCTP_PARAM_CHUNKS:
2125 if (!sctp_auth_enable)
2126 goto fallthrough;
2127
2128 /* SCTP-AUTH: Section 3.2
2129 * The CHUNKS parameter MUST be included once in the INIT or
2130 * INIT-ACK chunk if the sender wants to receive authenticated
2131 * chunks. Its maximum length is 260 bytes.
2132 */
2133 if (260 < ntohs(param.p->length)) {
2134 sctp_process_inv_paramlength(asoc, param.p,
2135 chunk, err_chunk);
2136 retval = SCTP_IERROR_ABORT;
2137 }
2138 break;
2139
2140 case SCTP_PARAM_HMAC_ALGO:
2141 if (!sctp_auth_enable)
2142 goto fallthrough;
2143
2144 hmacs = (struct sctp_hmac_algo_param *)param.p;
2145 n_elt = (ntohs(param.p->length) - sizeof(sctp_paramhdr_t)) >> 1;
2146
2147 /* SCTP-AUTH: Section 6.1
2148 * The HMAC algorithm based on SHA-1 MUST be supported and
2149 * included in the HMAC-ALGO parameter.
2150 */
2151 for (i = 0; i < n_elt; i++) {
2152 id = ntohs(hmacs->hmac_ids[i]);
2153
2154 if (id == SCTP_AUTH_HMAC_ID_SHA1)
2155 break;
2156 }
2157
2158 if (id != SCTP_AUTH_HMAC_ID_SHA1) {
2159 sctp_process_inv_paramlength(asoc, param.p, chunk,
2160 err_chunk);
2161 retval = SCTP_IERROR_ABORT;
2162 }
2163 break;
2164 fallthrough:
2165 default:
2166 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
2167 ntohs(param.p->type), cid);
2168 retval = sctp_process_unk_param(asoc, param, chunk, err_chunk);
2169 break;
2170 }
2171 return retval;
2172 }
2173
2174 /* Verify the INIT packet before we process it. */
2175 int sctp_verify_init(const struct sctp_association *asoc,
2176 sctp_cid_t cid,
2177 sctp_init_chunk_t *peer_init,
2178 struct sctp_chunk *chunk,
2179 struct sctp_chunk **errp)
2180 {
2181 union sctp_params param;
2182 int has_cookie = 0;
2183 int result;
2184
2185 /* Verify stream values are non-zero. */
2186 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
2187 (0 == peer_init->init_hdr.num_inbound_streams) ||
2188 (0 == peer_init->init_hdr.init_tag) ||
2189 (SCTP_DEFAULT_MINWINDOW > ntohl(peer_init->init_hdr.a_rwnd))) {
2190
2191 return sctp_process_inv_mandatory(asoc, chunk, errp);
2192 }
2193
2194 /* Check for missing mandatory parameters. */
2195 sctp_walk_params(param, peer_init, init_hdr.params) {
2196
2197 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
2198 has_cookie = 1;
2199
2200 } /* for (loop through all parameters) */
2201
2202 /* There is a possibility that a parameter length was bad and
2203 * in that case we would have stoped walking the parameters.
2204 * The current param.p would point at the bad one.
2205 * Current consensus on the mailing list is to generate a PROTOCOL
2206 * VIOLATION error. We build the ERROR chunk here and let the normal
2207 * error handling code build and send the packet.
2208 */
2209 if (param.v != (void*)chunk->chunk_end)
2210 return sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
2211
2212 /* The only missing mandatory param possible today is
2213 * the state cookie for an INIT-ACK chunk.
2214 */
2215 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie)
2216 return sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
2217 chunk, errp);
2218
2219 /* Verify all the variable length parameters */
2220 sctp_walk_params(param, peer_init, init_hdr.params) {
2221
2222 result = sctp_verify_param(asoc, param, cid, chunk, errp);
2223 switch (result) {
2224 case SCTP_IERROR_ABORT:
2225 case SCTP_IERROR_NOMEM:
2226 return 0;
2227 case SCTP_IERROR_ERROR:
2228 return 1;
2229 case SCTP_IERROR_NO_ERROR:
2230 default:
2231 break;
2232 }
2233
2234 } /* for (loop through all parameters) */
2235
2236 return 1;
2237 }
2238
2239 /* Unpack the parameters in an INIT packet into an association.
2240 * Returns 0 on failure, else success.
2241 * FIXME: This is an association method.
2242 */
2243 int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
2244 const union sctp_addr *peer_addr,
2245 sctp_init_chunk_t *peer_init, gfp_t gfp)
2246 {
2247 union sctp_params param;
2248 struct sctp_transport *transport;
2249 struct list_head *pos, *temp;
2250 char *cookie;
2251
2252 /* We must include the address that the INIT packet came from.
2253 * This is the only address that matters for an INIT packet.
2254 * When processing a COOKIE ECHO, we retrieve the from address
2255 * of the INIT from the cookie.
2256 */
2257
2258 /* This implementation defaults to making the first transport
2259 * added as the primary transport. The source address seems to
2260 * be a a better choice than any of the embedded addresses.
2261 */
2262 if (peer_addr) {
2263 if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
2264 goto nomem;
2265 }
2266
2267 /* Process the initialization parameters. */
2268 sctp_walk_params(param, peer_init, init_hdr.params) {
2269
2270 if (!sctp_process_param(asoc, param, peer_addr, gfp))
2271 goto clean_up;
2272 }
2273
2274 /* AUTH: After processing the parameters, make sure that we
2275 * have all the required info to potentially do authentications.
2276 */
2277 if (asoc->peer.auth_capable && (!asoc->peer.peer_random ||
2278 !asoc->peer.peer_hmacs))
2279 asoc->peer.auth_capable = 0;
2280
2281 /* In a non-backward compatible mode, if the peer claims
2282 * support for ADD-IP but not AUTH, the ADD-IP spec states
2283 * that we MUST ABORT the association. Section 6. The section
2284 * also give us an option to silently ignore the packet, which
2285 * is what we'll do here.
2286 */
2287 if (!sctp_addip_noauth &&
2288 (asoc->peer.asconf_capable && !asoc->peer.auth_capable)) {
2289 asoc->peer.addip_disabled_mask |= (SCTP_PARAM_ADD_IP |
2290 SCTP_PARAM_DEL_IP |
2291 SCTP_PARAM_SET_PRIMARY);
2292 asoc->peer.asconf_capable = 0;
2293 goto clean_up;
2294 }
2295
2296 /* Walk list of transports, removing transports in the UNKNOWN state. */
2297 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2298 transport = list_entry(pos, struct sctp_transport, transports);
2299 if (transport->state == SCTP_UNKNOWN) {
2300 sctp_assoc_rm_peer(asoc, transport);
2301 }
2302 }
2303
2304 /* The fixed INIT headers are always in network byte
2305 * order.
2306 */
2307 asoc->peer.i.init_tag =
2308 ntohl(peer_init->init_hdr.init_tag);
2309 asoc->peer.i.a_rwnd =
2310 ntohl(peer_init->init_hdr.a_rwnd);
2311 asoc->peer.i.num_outbound_streams =
2312 ntohs(peer_init->init_hdr.num_outbound_streams);
2313 asoc->peer.i.num_inbound_streams =
2314 ntohs(peer_init->init_hdr.num_inbound_streams);
2315 asoc->peer.i.initial_tsn =
2316 ntohl(peer_init->init_hdr.initial_tsn);
2317
2318 /* Apply the upper bounds for output streams based on peer's
2319 * number of inbound streams.
2320 */
2321 if (asoc->c.sinit_num_ostreams >
2322 ntohs(peer_init->init_hdr.num_inbound_streams)) {
2323 asoc->c.sinit_num_ostreams =
2324 ntohs(peer_init->init_hdr.num_inbound_streams);
2325 }
2326
2327 if (asoc->c.sinit_max_instreams >
2328 ntohs(peer_init->init_hdr.num_outbound_streams)) {
2329 asoc->c.sinit_max_instreams =
2330 ntohs(peer_init->init_hdr.num_outbound_streams);
2331 }
2332
2333 /* Copy Initiation tag from INIT to VT_peer in cookie. */
2334 asoc->c.peer_vtag = asoc->peer.i.init_tag;
2335
2336 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
2337 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
2338
2339 /* Copy cookie in case we need to resend COOKIE-ECHO. */
2340 cookie = asoc->peer.cookie;
2341 if (cookie) {
2342 asoc->peer.cookie = kmemdup(cookie, asoc->peer.cookie_len, gfp);
2343 if (!asoc->peer.cookie)
2344 goto clean_up;
2345 }
2346
2347 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
2348 * high (for example, implementations MAY use the size of the receiver
2349 * advertised window).
2350 */
2351 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
2352 transports) {
2353 transport->ssthresh = asoc->peer.i.a_rwnd;
2354 }
2355
2356 /* Set up the TSN tracking pieces. */
2357 if (!sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_INITIAL,
2358 asoc->peer.i.initial_tsn, gfp))
2359 goto clean_up;
2360
2361 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
2362 *
2363 * The stream sequence number in all the streams shall start
2364 * from 0 when the association is established. Also, when the
2365 * stream sequence number reaches the value 65535 the next
2366 * stream sequence number shall be set to 0.
2367 */
2368
2369 /* Allocate storage for the negotiated streams if it is not a temporary
2370 * association.
2371 */
2372 if (!asoc->temp) {
2373 int error;
2374
2375 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
2376 asoc->c.sinit_num_ostreams, gfp);
2377 if (!asoc->ssnmap)
2378 goto clean_up;
2379
2380 error = sctp_assoc_set_id(asoc, gfp);
2381 if (error)
2382 goto clean_up;
2383 }
2384
2385 /* ADDIP Section 4.1 ASCONF Chunk Procedures
2386 *
2387 * When an endpoint has an ASCONF signaled change to be sent to the
2388 * remote endpoint it should do the following:
2389 * ...
2390 * A2) A serial number should be assigned to the Chunk. The serial
2391 * number should be a monotonically increasing number. All serial
2392 * numbers are defined to be initialized at the start of the
2393 * association to the same value as the Initial TSN.
2394 */
2395 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
2396 return 1;
2397
2398 clean_up:
2399 /* Release the transport structures. */
2400 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
2401 transport = list_entry(pos, struct sctp_transport, transports);
2402 if (transport->state != SCTP_ACTIVE)
2403 sctp_assoc_rm_peer(asoc, transport);
2404 }
2405
2406 nomem:
2407 return 0;
2408 }
2409
2410
2411 /* Update asoc with the option described in param.
2412 *
2413 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2414 *
2415 * asoc is the association to update.
2416 * param is the variable length parameter to use for update.
2417 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2418 * If the current packet is an INIT we want to minimize the amount of
2419 * work we do. In particular, we should not build transport
2420 * structures for the addresses.
2421 */
2422 static int sctp_process_param(struct sctp_association *asoc,
2423 union sctp_params param,
2424 const union sctp_addr *peer_addr,
2425 gfp_t gfp)
2426 {
2427 union sctp_addr addr;
2428 int i;
2429 __u16 sat;
2430 int retval = 1;
2431 sctp_scope_t scope;
2432 time_t stale;
2433 struct sctp_af *af;
2434 union sctp_addr_param *addr_param;
2435 struct sctp_transport *t;
2436
2437 /* We maintain all INIT parameters in network byte order all the
2438 * time. This allows us to not worry about whether the parameters
2439 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2440 */
2441 switch (param.p->type) {
2442 case SCTP_PARAM_IPV6_ADDRESS:
2443 if (PF_INET6 != asoc->base.sk->sk_family)
2444 break;
2445 goto do_addr_param;
2446
2447 case SCTP_PARAM_IPV4_ADDRESS:
2448 /* v4 addresses are not allowed on v6-only socket */
2449 if (ipv6_only_sock(asoc->base.sk))
2450 break;
2451 do_addr_param:
2452 af = sctp_get_af_specific(param_type2af(param.p->type));
2453 af->from_addr_param(&addr, param.addr, htons(asoc->peer.port), 0);
2454 scope = sctp_scope(peer_addr);
2455 if (sctp_in_scope(&addr, scope))
2456 if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_UNCONFIRMED))
2457 return 0;
2458 break;
2459
2460 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2461 if (!sctp_cookie_preserve_enable)
2462 break;
2463
2464 stale = ntohl(param.life->lifespan_increment);
2465
2466 /* Suggested Cookie Life span increment's unit is msec,
2467 * (1/1000sec).
2468 */
2469 asoc->cookie_life.tv_sec += stale / 1000;
2470 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2471 break;
2472
2473 case SCTP_PARAM_HOST_NAME_ADDRESS:
2474 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2475 break;
2476
2477 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2478 /* Turn off the default values first so we'll know which
2479 * ones are really set by the peer.
2480 */
2481 asoc->peer.ipv4_address = 0;
2482 asoc->peer.ipv6_address = 0;
2483
2484 /* Assume that peer supports the address family
2485 * by which it sends a packet.
2486 */
2487 if (peer_addr->sa.sa_family == AF_INET6)
2488 asoc->peer.ipv6_address = 1;
2489 else if (peer_addr->sa.sa_family == AF_INET)
2490 asoc->peer.ipv4_address = 1;
2491
2492 /* Cycle through address types; avoid divide by 0. */
2493 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2494 if (sat)
2495 sat /= sizeof(__u16);
2496
2497 for (i = 0; i < sat; ++i) {
2498 switch (param.sat->types[i]) {
2499 case SCTP_PARAM_IPV4_ADDRESS:
2500 asoc->peer.ipv4_address = 1;
2501 break;
2502
2503 case SCTP_PARAM_IPV6_ADDRESS:
2504 if (PF_INET6 == asoc->base.sk->sk_family)
2505 asoc->peer.ipv6_address = 1;
2506 break;
2507
2508 case SCTP_PARAM_HOST_NAME_ADDRESS:
2509 asoc->peer.hostname_address = 1;
2510 break;
2511
2512 default: /* Just ignore anything else. */
2513 break;
2514 }
2515 }
2516 break;
2517
2518 case SCTP_PARAM_STATE_COOKIE:
2519 asoc->peer.cookie_len =
2520 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2521 asoc->peer.cookie = param.cookie->body;
2522 break;
2523
2524 case SCTP_PARAM_HEARTBEAT_INFO:
2525 /* Would be odd to receive, but it causes no problems. */
2526 break;
2527
2528 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2529 /* Rejected during verify stage. */
2530 break;
2531
2532 case SCTP_PARAM_ECN_CAPABLE:
2533 asoc->peer.ecn_capable = 1;
2534 break;
2535
2536 case SCTP_PARAM_ADAPTATION_LAYER_IND:
2537 asoc->peer.adaptation_ind = ntohl(param.aind->adaptation_ind);
2538 break;
2539
2540 case SCTP_PARAM_SET_PRIMARY:
2541 if (!sctp_addip_enable)
2542 goto fall_through;
2543
2544 addr_param = param.v + sizeof(sctp_addip_param_t);
2545
2546 af = sctp_get_af_specific(param_type2af(param.p->type));
2547 af->from_addr_param(&addr, addr_param,
2548 htons(asoc->peer.port), 0);
2549
2550 /* if the address is invalid, we can't process it.
2551 * XXX: see spec for what to do.
2552 */
2553 if (!af->addr_valid(&addr, NULL, NULL))
2554 break;
2555
2556 t = sctp_assoc_lookup_paddr(asoc, &addr);
2557 if (!t)
2558 break;
2559
2560 sctp_assoc_set_primary(asoc, t);
2561 break;
2562
2563 case SCTP_PARAM_SUPPORTED_EXT:
2564 sctp_process_ext_param(asoc, param);
2565 break;
2566
2567 case SCTP_PARAM_FWD_TSN_SUPPORT:
2568 if (sctp_prsctp_enable) {
2569 asoc->peer.prsctp_capable = 1;
2570 break;
2571 }
2572 /* Fall Through */
2573 goto fall_through;
2574
2575 case SCTP_PARAM_RANDOM:
2576 if (!sctp_auth_enable)
2577 goto fall_through;
2578
2579 /* Save peer's random parameter */
2580 asoc->peer.peer_random = kmemdup(param.p,
2581 ntohs(param.p->length), gfp);
2582 if (!asoc->peer.peer_random) {
2583 retval = 0;
2584 break;
2585 }
2586 break;
2587
2588 case SCTP_PARAM_HMAC_ALGO:
2589 if (!sctp_auth_enable)
2590 goto fall_through;
2591
2592 /* Save peer's HMAC list */
2593 asoc->peer.peer_hmacs = kmemdup(param.p,
2594 ntohs(param.p->length), gfp);
2595 if (!asoc->peer.peer_hmacs) {
2596 retval = 0;
2597 break;
2598 }
2599
2600 /* Set the default HMAC the peer requested*/
2601 sctp_auth_asoc_set_default_hmac(asoc, param.hmac_algo);
2602 break;
2603
2604 case SCTP_PARAM_CHUNKS:
2605 if (!sctp_auth_enable)
2606 goto fall_through;
2607
2608 asoc->peer.peer_chunks = kmemdup(param.p,
2609 ntohs(param.p->length), gfp);
2610 if (!asoc->peer.peer_chunks)
2611 retval = 0;
2612 break;
2613 fall_through:
2614 default:
2615 /* Any unrecognized parameters should have been caught
2616 * and handled by sctp_verify_param() which should be
2617 * called prior to this routine. Simply log the error
2618 * here.
2619 */
2620 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2621 ntohs(param.p->type), asoc);
2622 break;
2623 }
2624
2625 return retval;
2626 }
2627
2628 /* Select a new verification tag. */
2629 __u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2630 {
2631 /* I believe that this random number generator complies with RFC1750.
2632 * A tag of 0 is reserved for special cases (e.g. INIT).
2633 */
2634 __u32 x;
2635
2636 do {
2637 get_random_bytes(&x, sizeof(__u32));
2638 } while (x == 0);
2639
2640 return x;
2641 }
2642
2643 /* Select an initial TSN to send during startup. */
2644 __u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2645 {
2646 __u32 retval;
2647
2648 get_random_bytes(&retval, sizeof(__u32));
2649 return retval;
2650 }
2651
2652 /*
2653 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2654 * 0 1 2 3
2655 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2656 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2657 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2659 * | Serial Number |
2660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2661 * | Address Parameter |
2662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2663 * | ASCONF Parameter #1 |
2664 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2665 * \ \
2666 * / .... /
2667 * \ \
2668 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2669 * | ASCONF Parameter #N |
2670 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2671 *
2672 * Address Parameter and other parameter will not be wrapped in this function
2673 */
2674 static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2675 union sctp_addr *addr,
2676 int vparam_len)
2677 {
2678 sctp_addiphdr_t asconf;
2679 struct sctp_chunk *retval;
2680 int length = sizeof(asconf) + vparam_len;
2681 union sctp_addr_param addrparam;
2682 int addrlen;
2683 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2684
2685 addrlen = af->to_addr_param(addr, &addrparam);
2686 if (!addrlen)
2687 return NULL;
2688 length += addrlen;
2689
2690 /* Create the chunk. */
2691 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2692 if (!retval)
2693 return NULL;
2694
2695 asconf.serial = htonl(asoc->addip_serial++);
2696
2697 retval->subh.addip_hdr =
2698 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2699 retval->param_hdr.v =
2700 sctp_addto_chunk(retval, addrlen, &addrparam);
2701
2702 return retval;
2703 }
2704
2705 /* ADDIP
2706 * 3.2.1 Add IP Address
2707 * 0 1 2 3
2708 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2709 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2710 * | Type = 0xC001 | Length = Variable |
2711 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2712 * | ASCONF-Request Correlation ID |
2713 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2714 * | Address Parameter |
2715 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2716 *
2717 * 3.2.2 Delete IP Address
2718 * 0 1 2 3
2719 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2720 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2721 * | Type = 0xC002 | Length = Variable |
2722 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2723 * | ASCONF-Request Correlation ID |
2724 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2725 * | Address Parameter |
2726 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2727 *
2728 */
2729 struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2730 union sctp_addr *laddr,
2731 struct sockaddr *addrs,
2732 int addrcnt,
2733 __be16 flags)
2734 {
2735 sctp_addip_param_t param;
2736 struct sctp_chunk *retval;
2737 union sctp_addr_param addr_param;
2738 union sctp_addr *addr;
2739 void *addr_buf;
2740 struct sctp_af *af;
2741 int paramlen = sizeof(param);
2742 int addr_param_len = 0;
2743 int totallen = 0;
2744 int i;
2745
2746 /* Get total length of all the address parameters. */
2747 addr_buf = addrs;
2748 for (i = 0; i < addrcnt; i++) {
2749 addr = (union sctp_addr *)addr_buf;
2750 af = sctp_get_af_specific(addr->v4.sin_family);
2751 addr_param_len = af->to_addr_param(addr, &addr_param);
2752
2753 totallen += paramlen;
2754 totallen += addr_param_len;
2755
2756 addr_buf += af->sockaddr_len;
2757 }
2758
2759 /* Create an asconf chunk with the required length. */
2760 retval = sctp_make_asconf(asoc, laddr, totallen);
2761 if (!retval)
2762 return NULL;
2763
2764 /* Add the address parameters to the asconf chunk. */
2765 addr_buf = addrs;
2766 for (i = 0; i < addrcnt; i++) {
2767 addr = (union sctp_addr *)addr_buf;
2768 af = sctp_get_af_specific(addr->v4.sin_family);
2769 addr_param_len = af->to_addr_param(addr, &addr_param);
2770 param.param_hdr.type = flags;
2771 param.param_hdr.length = htons(paramlen + addr_param_len);
2772 param.crr_id = i;
2773
2774 sctp_addto_chunk(retval, paramlen, &param);
2775 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2776
2777 addr_buf += af->sockaddr_len;
2778 }
2779 return retval;
2780 }
2781
2782 /* ADDIP
2783 * 3.2.4 Set Primary IP Address
2784 * 0 1 2 3
2785 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2786 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2787 * | Type =0xC004 | Length = Variable |
2788 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2789 * | ASCONF-Request Correlation ID |
2790 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2791 * | Address Parameter |
2792 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2793 *
2794 * Create an ASCONF chunk with Set Primary IP address parameter.
2795 */
2796 struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2797 union sctp_addr *addr)
2798 {
2799 sctp_addip_param_t param;
2800 struct sctp_chunk *retval;
2801 int len = sizeof(param);
2802 union sctp_addr_param addrparam;
2803 int addrlen;
2804 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2805
2806 addrlen = af->to_addr_param(addr, &addrparam);
2807 if (!addrlen)
2808 return NULL;
2809 len += addrlen;
2810
2811 /* Create the chunk and make asconf header. */
2812 retval = sctp_make_asconf(asoc, addr, len);
2813 if (!retval)
2814 return NULL;
2815
2816 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2817 param.param_hdr.length = htons(len);
2818 param.crr_id = 0;
2819
2820 sctp_addto_chunk(retval, sizeof(param), &param);
2821 sctp_addto_chunk(retval, addrlen, &addrparam);
2822
2823 return retval;
2824 }
2825
2826 /* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2827 * 0 1 2 3
2828 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
2829 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2830 * | Type = 0x80 | Chunk Flags | Chunk Length |
2831 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2832 * | Serial Number |
2833 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2834 * | ASCONF Parameter Response#1 |
2835 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2836 * \ \
2837 * / .... /
2838 * \ \
2839 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2840 * | ASCONF Parameter Response#N |
2841 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2842 *
2843 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2844 */
2845 static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2846 __u32 serial, int vparam_len)
2847 {
2848 sctp_addiphdr_t asconf;
2849 struct sctp_chunk *retval;
2850 int length = sizeof(asconf) + vparam_len;
2851
2852 /* Create the chunk. */
2853 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2854 if (!retval)
2855 return NULL;
2856
2857 asconf.serial = htonl(serial);
2858
2859 retval->subh.addip_hdr =
2860 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2861
2862 return retval;
2863 }
2864
2865 /* Add response parameters to an ASCONF_ACK chunk. */
2866 static void sctp_add_asconf_response(struct sctp_chunk *chunk, __be32 crr_id,
2867 __be16 err_code, sctp_addip_param_t *asconf_param)
2868 {
2869 sctp_addip_param_t ack_param;
2870 sctp_errhdr_t err_param;
2871 int asconf_param_len = 0;
2872 int err_param_len = 0;
2873 __be16 response_type;
2874
2875 if (SCTP_ERROR_NO_ERROR == err_code) {
2876 response_type = SCTP_PARAM_SUCCESS_REPORT;
2877 } else {
2878 response_type = SCTP_PARAM_ERR_CAUSE;
2879 err_param_len = sizeof(err_param);
2880 if (asconf_param)
2881 asconf_param_len =
2882 ntohs(asconf_param->param_hdr.length);
2883 }
2884
2885 /* Add Success Indication or Error Cause Indication parameter. */
2886 ack_param.param_hdr.type = response_type;
2887 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2888 err_param_len +
2889 asconf_param_len);
2890 ack_param.crr_id = crr_id;
2891 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2892
2893 if (SCTP_ERROR_NO_ERROR == err_code)
2894 return;
2895
2896 /* Add Error Cause parameter. */
2897 err_param.cause = err_code;
2898 err_param.length = htons(err_param_len + asconf_param_len);
2899 sctp_addto_chunk(chunk, err_param_len, &err_param);
2900
2901 /* Add the failed TLV copied from ASCONF chunk. */
2902 if (asconf_param)
2903 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2904 }
2905
2906 /* Process a asconf parameter. */
2907 static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
2908 struct sctp_chunk *asconf,
2909 sctp_addip_param_t *asconf_param)
2910 {
2911 struct sctp_transport *peer;
2912 struct sctp_af *af;
2913 union sctp_addr addr;
2914 union sctp_addr_param *addr_param;
2915
2916 addr_param = (union sctp_addr_param *)
2917 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2918
2919 if (asconf_param->param_hdr.type != SCTP_PARAM_ADD_IP &&
2920 asconf_param->param_hdr.type != SCTP_PARAM_DEL_IP &&
2921 asconf_param->param_hdr.type != SCTP_PARAM_SET_PRIMARY)
2922 return SCTP_ERROR_UNKNOWN_PARAM;
2923
2924 switch (addr_param->v4.param_hdr.type) {
2925 case SCTP_PARAM_IPV6_ADDRESS:
2926 if (!asoc->peer.ipv6_address)
2927 return SCTP_ERROR_DNS_FAILED;
2928 break;
2929 case SCTP_PARAM_IPV4_ADDRESS:
2930 if (!asoc->peer.ipv4_address)
2931 return SCTP_ERROR_DNS_FAILED;
2932 break;
2933 default:
2934 return SCTP_ERROR_DNS_FAILED;
2935 }
2936
2937 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2938 if (unlikely(!af))
2939 return SCTP_ERROR_DNS_FAILED;
2940
2941 af->from_addr_param(&addr, addr_param, htons(asoc->peer.port), 0);
2942
2943 /* ADDIP 4.2.1 This parameter MUST NOT contain a broadcast
2944 * or multicast address.
2945 * (note: wildcard is permitted and requires special handling so
2946 * make sure we check for that)
2947 */
2948 if (!af->is_any(&addr) && !af->addr_valid(&addr, NULL, asconf->skb))
2949 return SCTP_ERROR_DNS_FAILED;
2950
2951 switch (asconf_param->param_hdr.type) {
2952 case SCTP_PARAM_ADD_IP:
2953 /* Section 4.2.1:
2954 * If the address 0.0.0.0 or ::0 is provided, the source
2955 * address of the packet MUST be added.
2956 */
2957 if (af->is_any(&addr))
2958 memcpy(&addr, &asconf->source, sizeof(addr));
2959
2960 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2961 * request and does not have the local resources to add this
2962 * new address to the association, it MUST return an Error
2963 * Cause TLV set to the new error code 'Operation Refused
2964 * Due to Resource Shortage'.
2965 */
2966
2967 peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
2968 if (!peer)
2969 return SCTP_ERROR_RSRC_LOW;
2970
2971 /* Start the heartbeat timer. */
2972 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2973 sctp_transport_hold(peer);
2974 break;
2975 case SCTP_PARAM_DEL_IP:
2976 /* ADDIP 4.3 D7) If a request is received to delete the
2977 * last remaining IP address of a peer endpoint, the receiver
2978 * MUST send an Error Cause TLV with the error cause set to the
2979 * new error code 'Request to Delete Last Remaining IP Address'.
2980 */
2981 if (asoc->peer.transport_count == 1)
2982 return SCTP_ERROR_DEL_LAST_IP;
2983
2984 /* ADDIP 4.3 D8) If a request is received to delete an IP
2985 * address which is also the source address of the IP packet
2986 * which contained the ASCONF chunk, the receiver MUST reject
2987 * this request. To reject the request the receiver MUST send
2988 * an Error Cause TLV set to the new error code 'Request to
2989 * Delete Source IP Address'
2990 */
2991 if (sctp_cmp_addr_exact(sctp_source(asconf), &addr))
2992 return SCTP_ERROR_DEL_SRC_IP;
2993
2994 /* Section 4.2.2
2995 * If the address 0.0.0.0 or ::0 is provided, all
2996 * addresses of the peer except the source address of the
2997 * packet MUST be deleted.
2998 */
2999 if (af->is_any(&addr)) {
3000 sctp_assoc_set_primary(asoc, asconf->transport);
3001 sctp_assoc_del_nonprimary_peers(asoc,
3002 asconf->transport);
3003 } else
3004 sctp_assoc_del_peer(asoc, &addr);
3005 break;
3006 case SCTP_PARAM_SET_PRIMARY:
3007 /* ADDIP Section 4.2.4
3008 * If the address 0.0.0.0 or ::0 is provided, the receiver
3009 * MAY mark the source address of the packet as its
3010 * primary.
3011 */
3012 if (af->is_any(&addr))
3013 memcpy(&addr.v4, sctp_source(asconf), sizeof(addr));
3014
3015 peer = sctp_assoc_lookup_paddr(asoc, &addr);
3016 if (!peer)
3017 return SCTP_ERROR_DNS_FAILED;
3018
3019 sctp_assoc_set_primary(asoc, peer);
3020 break;
3021 }
3022
3023 return SCTP_ERROR_NO_ERROR;
3024 }
3025
3026 /* Verify the ASCONF packet before we process it. */
3027 int sctp_verify_asconf(const struct sctp_association *asoc,
3028 struct sctp_paramhdr *param_hdr, void *chunk_end,
3029 struct sctp_paramhdr **errp) {
3030 sctp_addip_param_t *asconf_param;
3031 union sctp_params param;
3032 int length, plen;
3033
3034 param.v = (sctp_paramhdr_t *) param_hdr;
3035 while (param.v <= chunk_end - sizeof(sctp_paramhdr_t)) {
3036 length = ntohs(param.p->length);
3037 *errp = param.p;
3038
3039 if (param.v > chunk_end - length ||
3040 length < sizeof(sctp_paramhdr_t))
3041 return 0;
3042
3043 switch (param.p->type) {
3044 case SCTP_PARAM_ADD_IP:
3045 case SCTP_PARAM_DEL_IP:
3046 case SCTP_PARAM_SET_PRIMARY:
3047 asconf_param = (sctp_addip_param_t *)param.v;
3048 plen = ntohs(asconf_param->param_hdr.length);
3049 if (plen < sizeof(sctp_addip_param_t) +
3050 sizeof(sctp_paramhdr_t))
3051 return 0;
3052 break;
3053 case SCTP_PARAM_SUCCESS_REPORT:
3054 case SCTP_PARAM_ADAPTATION_LAYER_IND:
3055 if (length != sizeof(sctp_addip_param_t))
3056 return 0;
3057
3058 break;
3059 default:
3060 break;
3061 }
3062
3063 param.v += WORD_ROUND(length);
3064 }
3065
3066 if (param.v != chunk_end)
3067 return 0;
3068
3069 return 1;
3070 }
3071
3072 /* Process an incoming ASCONF chunk with the next expected serial no. and
3073 * return an ASCONF_ACK chunk to be sent in response.
3074 */
3075 struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
3076 struct sctp_chunk *asconf)
3077 {
3078 sctp_addiphdr_t *hdr;
3079 union sctp_addr_param *addr_param;
3080 sctp_addip_param_t *asconf_param;
3081 struct sctp_chunk *asconf_ack;
3082
3083 __be16 err_code;
3084 int length = 0;
3085 int chunk_len;
3086 __u32 serial;
3087 int all_param_pass = 1;
3088
3089 chunk_len = ntohs(asconf->chunk_hdr->length) - sizeof(sctp_chunkhdr_t);
3090 hdr = (sctp_addiphdr_t *)asconf->skb->data;
3091 serial = ntohl(hdr->serial);
3092
3093 /* Skip the addiphdr and store a pointer to address parameter. */
3094 length = sizeof(sctp_addiphdr_t);
3095 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3096 chunk_len -= length;
3097
3098 /* Skip the address parameter and store a pointer to the first
3099 * asconf parameter.
3100 */
3101 length = ntohs(addr_param->v4.param_hdr.length);
3102 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3103 chunk_len -= length;
3104
3105 /* create an ASCONF_ACK chunk.
3106 * Based on the definitions of parameters, we know that the size of
3107 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
3108 * parameters.
3109 */
3110 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
3111 if (!asconf_ack)
3112 goto done;
3113
3114 /* Process the TLVs contained within the ASCONF chunk. */
3115 while (chunk_len > 0) {
3116 err_code = sctp_process_asconf_param(asoc, asconf,
3117 asconf_param);
3118 /* ADDIP 4.1 A7)
3119 * If an error response is received for a TLV parameter,
3120 * all TLVs with no response before the failed TLV are
3121 * considered successful if not reported. All TLVs after
3122 * the failed response are considered unsuccessful unless
3123 * a specific success indication is present for the parameter.
3124 */
3125 if (SCTP_ERROR_NO_ERROR != err_code)
3126 all_param_pass = 0;
3127
3128 if (!all_param_pass)
3129 sctp_add_asconf_response(asconf_ack,
3130 asconf_param->crr_id, err_code,
3131 asconf_param);
3132
3133 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
3134 * an IP address sends an 'Out of Resource' in its response, it
3135 * MUST also fail any subsequent add or delete requests bundled
3136 * in the ASCONF.
3137 */
3138 if (SCTP_ERROR_RSRC_LOW == err_code)
3139 goto done;
3140
3141 /* Move to the next ASCONF param. */
3142 length = ntohs(asconf_param->param_hdr.length);
3143 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3144 length);
3145 chunk_len -= length;
3146 }
3147
3148 done:
3149 asoc->peer.addip_serial++;
3150
3151 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
3152 * after freeing the reference to old asconf ack if any.
3153 */
3154 if (asconf_ack) {
3155 sctp_chunk_hold(asconf_ack);
3156 list_add_tail(&asconf_ack->transmitted_list,
3157 &asoc->asconf_ack_list);
3158 }
3159
3160 return asconf_ack;
3161 }
3162
3163 /* Process a asconf parameter that is successfully acked. */
3164 static void sctp_asconf_param_success(struct sctp_association *asoc,
3165 sctp_addip_param_t *asconf_param)
3166 {
3167 struct sctp_af *af;
3168 union sctp_addr addr;
3169 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
3170 union sctp_addr_param *addr_param;
3171 struct sctp_transport *transport;
3172 struct sctp_sockaddr_entry *saddr;
3173
3174 addr_param = (union sctp_addr_param *)
3175 ((void *)asconf_param + sizeof(sctp_addip_param_t));
3176
3177 /* We have checked the packet before, so we do not check again. */
3178 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
3179 af->from_addr_param(&addr, addr_param, htons(bp->port), 0);
3180
3181 switch (asconf_param->param_hdr.type) {
3182 case SCTP_PARAM_ADD_IP:
3183 /* This is always done in BH context with a socket lock
3184 * held, so the list can not change.
3185 */
3186 local_bh_disable();
3187 list_for_each_entry(saddr, &bp->address_list, list) {
3188 if (sctp_cmp_addr_exact(&saddr->a, &addr))
3189 saddr->state = SCTP_ADDR_SRC;
3190 }
3191 local_bh_enable();
3192 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3193 transports) {
3194 if (transport->state == SCTP_ACTIVE)
3195 continue;
3196 dst_release(transport->dst);
3197 sctp_transport_route(transport, NULL,
3198 sctp_sk(asoc->base.sk));
3199 }
3200 break;
3201 case SCTP_PARAM_DEL_IP:
3202 local_bh_disable();
3203 sctp_del_bind_addr(bp, &addr);
3204 local_bh_enable();
3205 list_for_each_entry(transport, &asoc->peer.transport_addr_list,
3206 transports) {
3207 dst_release(transport->dst);
3208 sctp_transport_route(transport, NULL,
3209 sctp_sk(asoc->base.sk));
3210 }
3211 break;
3212 default:
3213 break;
3214 }
3215 }
3216
3217 /* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
3218 * for the given asconf parameter. If there is no response for this parameter,
3219 * return the error code based on the third argument 'no_err'.
3220 * ADDIP 4.1
3221 * A7) If an error response is received for a TLV parameter, all TLVs with no
3222 * response before the failed TLV are considered successful if not reported.
3223 * All TLVs after the failed response are considered unsuccessful unless a
3224 * specific success indication is present for the parameter.
3225 */
3226 static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
3227 sctp_addip_param_t *asconf_param,
3228 int no_err)
3229 {
3230 sctp_addip_param_t *asconf_ack_param;
3231 sctp_errhdr_t *err_param;
3232 int length;
3233 int asconf_ack_len;
3234 __be16 err_code;
3235
3236 if (no_err)
3237 err_code = SCTP_ERROR_NO_ERROR;
3238 else
3239 err_code = SCTP_ERROR_REQ_REFUSED;
3240
3241 asconf_ack_len = ntohs(asconf_ack->chunk_hdr->length) -
3242 sizeof(sctp_chunkhdr_t);
3243
3244 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
3245 * the first asconf_ack parameter.
3246 */
3247 length = sizeof(sctp_addiphdr_t);
3248 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
3249 length);
3250 asconf_ack_len -= length;
3251
3252 while (asconf_ack_len > 0) {
3253 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
3254 switch(asconf_ack_param->param_hdr.type) {
3255 case SCTP_PARAM_SUCCESS_REPORT:
3256 return SCTP_ERROR_NO_ERROR;
3257 case SCTP_PARAM_ERR_CAUSE:
3258 length = sizeof(sctp_addip_param_t);
3259 err_param = (sctp_errhdr_t *)
3260 ((void *)asconf_ack_param + length);
3261 asconf_ack_len -= length;
3262 if (asconf_ack_len > 0)
3263 return err_param->cause;
3264 else
3265 return SCTP_ERROR_INV_PARAM;
3266 break;
3267 default:
3268 return SCTP_ERROR_INV_PARAM;
3269 }
3270 }
3271
3272 length = ntohs(asconf_ack_param->param_hdr.length);
3273 asconf_ack_param = (sctp_addip_param_t *)
3274 ((void *)asconf_ack_param + length);
3275 asconf_ack_len -= length;
3276 }
3277
3278 return err_code;
3279 }
3280
3281 /* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
3282 int sctp_process_asconf_ack(struct sctp_association *asoc,
3283 struct sctp_chunk *asconf_ack)
3284 {
3285 struct sctp_chunk *asconf = asoc->addip_last_asconf;
3286 union sctp_addr_param *addr_param;
3287 sctp_addip_param_t *asconf_param;
3288 int length = 0;
3289 int asconf_len = asconf->skb->len;
3290 int all_param_pass = 0;
3291 int no_err = 1;
3292 int retval = 0;
3293 __be16 err_code = SCTP_ERROR_NO_ERROR;
3294
3295 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
3296 * a pointer to address parameter.
3297 */
3298 length = sizeof(sctp_addip_chunk_t);
3299 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
3300 asconf_len -= length;
3301
3302 /* Skip the address parameter in the last asconf sent and store a
3303 * pointer to the first asconf parameter.
3304 */
3305 length = ntohs(addr_param->v4.param_hdr.length);
3306 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
3307 asconf_len -= length;
3308
3309 /* ADDIP 4.1
3310 * A8) If there is no response(s) to specific TLV parameter(s), and no
3311 * failures are indicated, then all request(s) are considered
3312 * successful.
3313 */
3314 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
3315 all_param_pass = 1;
3316
3317 /* Process the TLVs contained in the last sent ASCONF chunk. */
3318 while (asconf_len > 0) {
3319 if (all_param_pass)
3320 err_code = SCTP_ERROR_NO_ERROR;
3321 else {
3322 err_code = sctp_get_asconf_response(asconf_ack,
3323 asconf_param,
3324 no_err);
3325 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
3326 no_err = 0;
3327 }
3328
3329 switch (err_code) {
3330 case SCTP_ERROR_NO_ERROR:
3331 sctp_asconf_param_success(asoc, asconf_param);
3332 break;
3333
3334 case SCTP_ERROR_RSRC_LOW:
3335 retval = 1;
3336 break;
3337
3338 case SCTP_ERROR_UNKNOWN_PARAM:
3339 /* Disable sending this type of asconf parameter in
3340 * future.
3341 */
3342 asoc->peer.addip_disabled_mask |=
3343 asconf_param->param_hdr.type;
3344 break;
3345
3346 case SCTP_ERROR_REQ_REFUSED:
3347 case SCTP_ERROR_DEL_LAST_IP:
3348 case SCTP_ERROR_DEL_SRC_IP:
3349 default:
3350 break;
3351 }
3352
3353 /* Skip the processed asconf parameter and move to the next
3354 * one.
3355 */
3356 length = ntohs(asconf_param->param_hdr.length);
3357 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
3358 length);
3359 asconf_len -= length;
3360 }
3361
3362 /* Free the cached last sent asconf chunk. */
3363 list_del_init(&asconf->transmitted_list);
3364 sctp_chunk_free(asconf);
3365 asoc->addip_last_asconf = NULL;
3366
3367 return retval;
3368 }
3369
3370 /* Make a FWD TSN chunk. */
3371 struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
3372 __u32 new_cum_tsn, size_t nstreams,
3373 struct sctp_fwdtsn_skip *skiplist)
3374 {
3375 struct sctp_chunk *retval = NULL;
3376 struct sctp_fwdtsn_chunk *ftsn_chunk;
3377 struct sctp_fwdtsn_hdr ftsn_hdr;
3378 struct sctp_fwdtsn_skip skip;
3379 size_t hint;
3380 int i;
3381
3382 hint = (nstreams + 1) * sizeof(__u32);
3383
3384 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
3385
3386 if (!retval)
3387 return NULL;
3388
3389 ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr;
3390
3391 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
3392 retval->subh.fwdtsn_hdr =
3393 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
3394
3395 for (i = 0; i < nstreams; i++) {
3396 skip.stream = skiplist[i].stream;
3397 skip.ssn = skiplist[i].ssn;
3398 sctp_addto_chunk(retval, sizeof(skip), &skip);
3399 }
3400
3401 return retval;
3402 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree