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[SCTP]: Switch sctp_add_bind_addr() to net-endian.
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1da177e4
LT		 1/* SCTP kernel reference 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 reference 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 * The SCTP reference 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 * The SCTP reference 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 <asm/scatterlist.h>
60#include <linux/crypto.h>
61#include <net/sock.h>
62
63#include <linux/skbuff.h>
64#include <linux/random.h> /* for get_random_bytes */
65#include <net/sctp/sctp.h>
66#include <net/sctp/sm.h>
67
68extern kmem_cache_t *sctp_chunk_cachep;
69
70SCTP_STATIC
71struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
72 __u8 type, __u8 flags, int paylen);
73static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
74 const struct sctp_association *asoc,
75 const struct sctp_chunk *init_chunk,
76 int *cookie_len,
77 const __u8 *raw_addrs, int addrs_len);
78static int sctp_process_param(struct sctp_association *asoc,
79 union sctp_params param,
80 const union sctp_addr *peer_addr,
dd0fc66f 81 gfp_t gfp);
1da177e4
LT		 82
83/* What was the inbound interface for this chunk? */
84int sctp_chunk_iif(const struct sctp_chunk *chunk)
85{
86 struct sctp_af *af;
87 int iif = 0;
88
89 af = sctp_get_af_specific(ipver2af(chunk->skb->nh.iph->version));
90 if (af)
91 iif = af->skb_iif(chunk->skb);
92
93 return iif;
94}
95
96/* RFC 2960 3.3.2 Initiation (INIT) (1)
97 *
98 * Note 2: The ECN capable field is reserved for future use of
99 * Explicit Congestion Notification.
100 */
101static const struct sctp_paramhdr ecap_param = {
102 SCTP_PARAM_ECN_CAPABLE,
103 __constant_htons(sizeof(struct sctp_paramhdr)),
104};
105static const struct sctp_paramhdr prsctp_param = {
106 SCTP_PARAM_FWD_TSN_SUPPORT,
107 __constant_htons(sizeof(struct sctp_paramhdr)),
108};
109
110/* A helper to initialize to initialize an op error inside a
111 * provided chunk, as most cause codes will be embedded inside an
112 * abort chunk.
113 */
5bf2db03 114void sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
1da177e4
LT		 115 const void *payload, size_t paylen)
116{
117 sctp_errhdr_t err;
118 int padlen;
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 padlen = len % 4;
125 err.length = htons(len);
126 len += padlen;
127 sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
128 chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload);
129}
130
131/* 3.3.2 Initiation (INIT) (1)
132 *
133 * This chunk is used to initiate a SCTP association between two
134 * endpoints. The format of the INIT chunk is shown below:
135 *
136 * 0 1 2 3
137 * 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
138 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
139 * | Type = 1 | Chunk Flags | Chunk Length |
140 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
141 * | Initiate Tag |
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | Advertised Receiver Window Credit (a_rwnd) |
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * | Number of Outbound Streams | Number of Inbound Streams |
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 * | Initial TSN |
148 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149 * \ \
150 * / Optional/Variable-Length Parameters /
151 * \ \
152 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
153 *
154 *
155 * The INIT chunk contains the following parameters. Unless otherwise
156 * noted, each parameter MUST only be included once in the INIT chunk.
157 *
158 * Fixed Parameters Status
159 * ----------------------------------------------
160 * Initiate Tag Mandatory
161 * Advertised Receiver Window Credit Mandatory
162 * Number of Outbound Streams Mandatory
163 * Number of Inbound Streams Mandatory
164 * Initial TSN Mandatory
165 *
166 * Variable Parameters Status Type Value
167 * -------------------------------------------------------------
168 * IPv4 Address (Note 1) Optional 5
169 * IPv6 Address (Note 1) Optional 6
170 * Cookie Preservative Optional 9
171 * Reserved for ECN Capable (Note 2) Optional 32768 (0x8000)
172 * Host Name Address (Note 3) Optional 11
173 * Supported Address Types (Note 4) Optional 12
174 */
175struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
176 const struct sctp_bind_addr *bp,
dd0fc66f 177 gfp_t gfp, int vparam_len)
1da177e4
LT		 178{
179 sctp_inithdr_t init;
180 union sctp_params addrs;
181 size_t chunksize;
182 struct sctp_chunk *retval = NULL;
183 int num_types, addrs_len = 0;
184 struct sctp_sock *sp;
185 sctp_supported_addrs_param_t sat;
186 __u16 types[2];
187 sctp_adaption_ind_param_t aiparam;
188
189 /* RFC 2960 3.3.2 Initiation (INIT) (1)
190 *
191 * Note 1: The INIT chunks can contain multiple addresses that
192 * can be IPv4 and/or IPv6 in any combination.
193 */
194 retval = NULL;
195
196 /* Convert the provided bind address list to raw format. */
197 addrs = sctp_bind_addrs_to_raw(bp, &addrs_len, gfp);
198
199 init.init_tag = htonl(asoc->c.my_vtag);
200 init.a_rwnd = htonl(asoc->rwnd);
201 init.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
202 init.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
203 init.initial_tsn = htonl(asoc->c.initial_tsn);
204
205 /* How many address types are needed? */
206 sp = sctp_sk(asoc->base.sk);
207 num_types = sp->pf->supported_addrs(sp, types);
208
209 chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
210 chunksize += sizeof(ecap_param);
211 if (sctp_prsctp_enable)
212 chunksize += sizeof(prsctp_param);
213 chunksize += sizeof(aiparam);
214 chunksize += vparam_len;
215
216 /* RFC 2960 3.3.2 Initiation (INIT) (1)
217 *
218 * Note 3: An INIT chunk MUST NOT contain more than one Host
219 * Name address parameter. Moreover, the sender of the INIT
220 * MUST NOT combine any other address types with the Host Name
221 * address in the INIT. The receiver of INIT MUST ignore any
222 * other address types if the Host Name address parameter is
223 * present in the received INIT chunk.
224 *
225 * PLEASE DO NOT FIXME [This version does not support Host Name.]
226 */
227
228 retval = sctp_make_chunk(asoc, SCTP_CID_INIT, 0, chunksize);
229 if (!retval)
230 goto nodata;
231
232 retval->subh.init_hdr =
233 sctp_addto_chunk(retval, sizeof(init), &init);
234 retval->param_hdr.v =
235 sctp_addto_chunk(retval, addrs_len, addrs.v);
236
237 /* RFC 2960 3.3.2 Initiation (INIT) (1)
238 *
239 * Note 4: This parameter, when present, specifies all the
240 * address types the sending endpoint can support. The absence
241 * of this parameter indicates that the sending endpoint can
242 * support any address type.
243 */
244 sat.param_hdr.type = SCTP_PARAM_SUPPORTED_ADDRESS_TYPES;
245 sat.param_hdr.length = htons(SCTP_SAT_LEN(num_types));
246 sctp_addto_chunk(retval, sizeof(sat), &sat);
247 sctp_addto_chunk(retval, num_types * sizeof(__u16), &types);
248
249 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
250 if (sctp_prsctp_enable)
251 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
252 aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND;
253 aiparam.param_hdr.length = htons(sizeof(aiparam));
254 aiparam.adaption_ind = htonl(sp->adaption_ind);
255 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
256nodata:
a51482bd 257 kfree(addrs.v);
1da177e4
LT		 258 return retval;
259}
260
261struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
262 const struct sctp_chunk *chunk,
dd0fc66f 263 gfp_t gfp, int unkparam_len)
1da177e4
LT		 264{
265 sctp_inithdr_t initack;
266 struct sctp_chunk *retval;
267 union sctp_params addrs;
268 int addrs_len;
269 sctp_cookie_param_t *cookie;
270 int cookie_len;
271 size_t chunksize;
272 sctp_adaption_ind_param_t aiparam;
273
274 retval = NULL;
275
276 /* Note: there may be no addresses to embed. */
277 addrs = sctp_bind_addrs_to_raw(&asoc->base.bind_addr, &addrs_len, gfp);
278
279 initack.init_tag = htonl(asoc->c.my_vtag);
280 initack.a_rwnd = htonl(asoc->rwnd);
281 initack.num_outbound_streams = htons(asoc->c.sinit_num_ostreams);
282 initack.num_inbound_streams = htons(asoc->c.sinit_max_instreams);
283 initack.initial_tsn = htonl(asoc->c.initial_tsn);
284
285 /* FIXME: We really ought to build the cookie right
286 * into the packet instead of allocating more fresh memory.
287 */
288 cookie = sctp_pack_cookie(asoc->ep, asoc, chunk, &cookie_len,
289 addrs.v, addrs_len);
290 if (!cookie)
291 goto nomem_cookie;
292
293 /* Calculate the total size of allocation, include the reserved
294 * space for reporting unknown parameters if it is specified.
295 */
296 chunksize = sizeof(initack) + addrs_len + cookie_len + unkparam_len;
297
298 /* Tell peer that we'll do ECN only if peer advertised such cap. */
299 if (asoc->peer.ecn_capable)
300 chunksize += sizeof(ecap_param);
301
302 /* Tell peer that we'll do PR-SCTP only if peer advertised. */
303 if (asoc->peer.prsctp_capable)
304 chunksize += sizeof(prsctp_param);
305
306 chunksize += sizeof(aiparam);
307
308 /* Now allocate and fill out the chunk. */
309 retval = sctp_make_chunk(asoc, SCTP_CID_INIT_ACK, 0, chunksize);
310 if (!retval)
311 goto nomem_chunk;
312
313 /* Per the advice in RFC 2960 6.4, send this reply to
314 * the source of the INIT packet.
315 */
316 retval->transport = chunk->transport;
317 retval->subh.init_hdr =
318 sctp_addto_chunk(retval, sizeof(initack), &initack);
319 retval->param_hdr.v = sctp_addto_chunk(retval, addrs_len, addrs.v);
320 sctp_addto_chunk(retval, cookie_len, cookie);
321 if (asoc->peer.ecn_capable)
322 sctp_addto_chunk(retval, sizeof(ecap_param), &ecap_param);
323 if (asoc->peer.prsctp_capable)
324 sctp_addto_chunk(retval, sizeof(prsctp_param), &prsctp_param);
325
326 aiparam.param_hdr.type = SCTP_PARAM_ADAPTION_LAYER_IND;
327 aiparam.param_hdr.length = htons(sizeof(aiparam));
328 aiparam.adaption_ind = htonl(sctp_sk(asoc->base.sk)->adaption_ind);
329 sctp_addto_chunk(retval, sizeof(aiparam), &aiparam);
330
331 /* We need to remove the const qualifier at this point. */
332 retval->asoc = (struct sctp_association *) asoc;
333
334 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
335 *
336 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
337 * HEARTBEAT ACK, * etc.) to the same destination transport
338 * address from which it received the DATA or control chunk
339 * to which it is replying.
340 *
341 * [INIT ACK back to where the INIT came from.]
342 */
343 if (chunk)
344 retval->transport = chunk->transport;
345
346nomem_chunk:
347 kfree(cookie);
348nomem_cookie:
a51482bd 349 kfree(addrs.v);
1da177e4
LT		 350 return retval;
351}
352
353/* 3.3.11 Cookie Echo (COOKIE ECHO) (10):
354 *
355 * This chunk is used only during the initialization of an association.
356 * It is sent by the initiator of an association to its peer to complete
357 * the initialization process. This chunk MUST precede any DATA chunk
358 * sent within the association, but MAY be bundled with one or more DATA
359 * chunks in the same packet.
360 *
361 * 0 1 2 3
362 * 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
363 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
364 * | Type = 10 |Chunk Flags | Length |
365 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
366 * / Cookie /
367 * \ \
368 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
369 *
370 * Chunk Flags: 8 bit
371 *
372 * Set to zero on transmit and ignored on receipt.
373 *
374 * Length: 16 bits (unsigned integer)
375 *
376 * Set to the size of the chunk in bytes, including the 4 bytes of
377 * the chunk header and the size of the Cookie.
378 *
379 * Cookie: variable size
380 *
381 * This field must contain the exact cookie received in the
382 * State Cookie parameter from the previous INIT ACK.
383 *
384 * An implementation SHOULD make the cookie as small as possible
385 * to insure interoperability.
386 */
387struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
388 const struct sctp_chunk *chunk)
389{
390 struct sctp_chunk *retval;
391 void *cookie;
392 int cookie_len;
393
394 cookie = asoc->peer.cookie;
395 cookie_len = asoc->peer.cookie_len;
396
397 /* Build a cookie echo chunk. */
398 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ECHO, 0, cookie_len);
399 if (!retval)
400 goto nodata;
401 retval->subh.cookie_hdr =
402 sctp_addto_chunk(retval, cookie_len, cookie);
403
404 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
405 *
406 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
407 * HEARTBEAT ACK, * etc.) to the same destination transport
408 * address from which it * received the DATA or control chunk
409 * to which it is replying.
410 *
411 * [COOKIE ECHO back to where the INIT ACK came from.]
412 */
413 if (chunk)
414 retval->transport = chunk->transport;
415
416nodata:
417 return retval;
418}
419
420/* 3.3.12 Cookie Acknowledgement (COOKIE ACK) (11):
421 *
422 * This chunk is used only during the initialization of an
423 * association. It is used to acknowledge the receipt of a COOKIE
424 * ECHO chunk. This chunk MUST precede any DATA or SACK chunk sent
425 * within the association, but MAY be bundled with one or more DATA
426 * chunks or SACK chunk in the same SCTP packet.
427 *
428 * 0 1 2 3
429 * 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
430 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
431 * | Type = 11 |Chunk Flags | Length = 4 |
432 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
433 *
434 * Chunk Flags: 8 bits
435 *
436 * Set to zero on transmit and ignored on receipt.
437 */
438struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
439 const struct sctp_chunk *chunk)
440{
441 struct sctp_chunk *retval;
442
443 retval = sctp_make_chunk(asoc, SCTP_CID_COOKIE_ACK, 0, 0);
444
445 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
446 *
447 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
448 * HEARTBEAT ACK, * etc.) to the same destination transport
449 * address from which it * received the DATA or control chunk
450 * to which it is replying.
451 *
452 * [COOKIE ACK back to where the COOKIE ECHO came from.]
453 */
454 if (retval && chunk)
455 retval->transport = chunk->transport;
456
457 return retval;
458}
459
460/*
461 * Appendix A: Explicit Congestion Notification:
462 * CWR:
463 *
464 * RFC 2481 details a specific bit for a sender to send in the header of
465 * its next outbound TCP segment to indicate to its peer that it has
466 * reduced its congestion window. This is termed the CWR bit. For
467 * SCTP the same indication is made by including the CWR chunk.
468 * This chunk contains one data element, i.e. the TSN number that
469 * was sent in the ECNE chunk. This element represents the lowest
470 * TSN number in the datagram that was originally marked with the
471 * CE bit.
472 *
473 * 0 1 2 3
474 * 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
475 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
476 * | Chunk Type=13 | Flags=00000000| Chunk Length = 8 |
477 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
478 * | Lowest TSN Number |
479 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
480 *
481 * Note: The CWR is considered a Control chunk.
482 */
483struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
484 const __u32 lowest_tsn,
485 const struct sctp_chunk *chunk)
486{
487 struct sctp_chunk *retval;
488 sctp_cwrhdr_t cwr;
489
490 cwr.lowest_tsn = htonl(lowest_tsn);
491 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_CWR, 0,
492 sizeof(sctp_cwrhdr_t));
493
494 if (!retval)
495 goto nodata;
496
497 retval->subh.ecn_cwr_hdr =
498 sctp_addto_chunk(retval, sizeof(cwr), &cwr);
499
500 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
501 *
502 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
503 * HEARTBEAT ACK, * etc.) to the same destination transport
504 * address from which it * received the DATA or control chunk
505 * to which it is replying.
506 *
507 * [Report a reduced congestion window back to where the ECNE
508 * came from.]
509 */
510 if (chunk)
511 retval->transport = chunk->transport;
512
513nodata:
514 return retval;
515}
516
517/* Make an ECNE chunk. This is a congestion experienced report. */
518struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
519 const __u32 lowest_tsn)
520{
521 struct sctp_chunk *retval;
522 sctp_ecnehdr_t ecne;
523
524 ecne.lowest_tsn = htonl(lowest_tsn);
525 retval = sctp_make_chunk(asoc, SCTP_CID_ECN_ECNE, 0,
526 sizeof(sctp_ecnehdr_t));
527 if (!retval)
528 goto nodata;
529 retval->subh.ecne_hdr =
530 sctp_addto_chunk(retval, sizeof(ecne), &ecne);
531
532nodata:
533 return retval;
534}
535
536/* Make a DATA chunk for the given association from the provided
537 * parameters. However, do not populate the data payload.
538 */
539struct sctp_chunk *sctp_make_datafrag_empty(struct sctp_association *asoc,
540 const struct sctp_sndrcvinfo *sinfo,
541 int data_len, __u8 flags, __u16 ssn)
542{
543 struct sctp_chunk *retval;
544 struct sctp_datahdr dp;
545 int chunk_len;
546
547 /* We assign the TSN as LATE as possible, not here when
548 * creating the chunk.
549 */
550 dp.tsn = 0;
551 dp.stream = htons(sinfo->sinfo_stream);
552 dp.ppid = sinfo->sinfo_ppid;
553
554 /* Set the flags for an unordered send. */
eaa5c54d 555 if (sinfo->sinfo_flags & SCTP_UNORDERED) {
1da177e4
LT		 556 flags |= SCTP_DATA_UNORDERED;
557 dp.ssn = 0;
558 } else
559 dp.ssn = htons(ssn);
560
561 chunk_len = sizeof(dp) + data_len;
562 retval = sctp_make_chunk(asoc, SCTP_CID_DATA, flags, chunk_len);
563 if (!retval)
564 goto nodata;
565
566 retval->subh.data_hdr = sctp_addto_chunk(retval, sizeof(dp), &dp);
567 memcpy(&retval->sinfo, sinfo, sizeof(struct sctp_sndrcvinfo));
568
569nodata:
570 return retval;
571}
572
573/* Create a selective ackowledgement (SACK) for the given
574 * association. This reports on which TSN's we've seen to date,
575 * including duplicates and gaps.
576 */
577struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
578{
579 struct sctp_chunk *retval;
580 struct sctp_sackhdr sack;
581 int len;
582 __u32 ctsn;
583 __u16 num_gabs, num_dup_tsns;
584 struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
585
586 ctsn = sctp_tsnmap_get_ctsn(map);
587 SCTP_DEBUG_PRINTK("sackCTSNAck sent: 0x%x.\n", ctsn);
588
589 /* How much room is needed in the chunk? */
590 num_gabs = sctp_tsnmap_num_gabs(map);
591 num_dup_tsns = sctp_tsnmap_num_dups(map);
592
593 /* Initialize the SACK header. */
594 sack.cum_tsn_ack = htonl(ctsn);
595 sack.a_rwnd = htonl(asoc->a_rwnd);
596 sack.num_gap_ack_blocks = htons(num_gabs);
597 sack.num_dup_tsns = htons(num_dup_tsns);
598
599 len = sizeof(sack)
600 + sizeof(struct sctp_gap_ack_block) * num_gabs
601 + sizeof(__u32) * num_dup_tsns;
602
603 /* Create the chunk. */
604 retval = sctp_make_chunk(asoc, SCTP_CID_SACK, 0, len);
605 if (!retval)
606 goto nodata;
607
608 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
609 *
610 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
611 * HEARTBEAT ACK, etc.) to the same destination transport
612 * address from which it received the DATA or control chunk to
613 * which it is replying. This rule should also be followed if
614 * the endpoint is bundling DATA chunks together with the
615 * reply chunk.
616 *
617 * However, when acknowledging multiple DATA chunks received
618 * in packets from different source addresses in a single
619 * SACK, the SACK chunk may be transmitted to one of the
620 * destination transport addresses from which the DATA or
621 * control chunks being acknowledged were received.
622 *
623 * [BUG: We do not implement the following paragraph.
624 * Perhaps we should remember the last transport we used for a
625 * SACK and avoid that (if possible) if we have seen any
626 * duplicates. --piggy]
627 *
628 * When a receiver of a duplicate DATA chunk sends a SACK to a
629 * multi- homed endpoint it MAY be beneficial to vary the
630 * destination address and not use the source address of the
631 * DATA chunk. The reason being that receiving a duplicate
632 * from a multi-homed endpoint might indicate that the return
633 * path (as specified in the source address of the DATA chunk)
634 * for the SACK is broken.
635 *
636 * [Send to the address from which we last received a DATA chunk.]
637 */
638 retval->transport = asoc->peer.last_data_from;
639
640 retval->subh.sack_hdr =
641 sctp_addto_chunk(retval, sizeof(sack), &sack);
642
643 /* Add the gap ack block information. */
644 if (num_gabs)
645 sctp_addto_chunk(retval, sizeof(__u32) * num_gabs,
646 sctp_tsnmap_get_gabs(map));
647
648 /* Add the duplicate TSN information. */
649 if (num_dup_tsns)
650 sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
651 sctp_tsnmap_get_dups(map));
652
653nodata:
654 return retval;
655}
656
657/* Make a SHUTDOWN chunk. */
658struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
659 const struct sctp_chunk *chunk)
660{
661 struct sctp_chunk *retval;
662 sctp_shutdownhdr_t shut;
663 __u32 ctsn;
664
665 ctsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
666 shut.cum_tsn_ack = htonl(ctsn);
667
668 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN, 0,
669 sizeof(sctp_shutdownhdr_t));
670 if (!retval)
671 goto nodata;
672
673 retval->subh.shutdown_hdr =
674 sctp_addto_chunk(retval, sizeof(shut), &shut);
675
676 if (chunk)
677 retval->transport = chunk->transport;
678nodata:
679 return retval;
680}
681
682struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
683 const struct sctp_chunk *chunk)
684{
685 struct sctp_chunk *retval;
686
687 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_ACK, 0, 0);
688
689 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
690 *
691 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
692 * HEARTBEAT ACK, * etc.) to the same destination transport
693 * address from which it * received the DATA or control chunk
694 * to which it is replying.
695 *
696 * [ACK back to where the SHUTDOWN came from.]
697 */
698 if (retval && chunk)
699 retval->transport = chunk->transport;
700
701 return retval;
702}
703
704struct sctp_chunk *sctp_make_shutdown_complete(
705 const struct sctp_association *asoc,
706 const struct sctp_chunk *chunk)
707{
708 struct sctp_chunk *retval;
709 __u8 flags = 0;
710
047a2428
JF		 711 /* Set the T-bit if we have no association (vtag will be
712 * reflected)
713 */
1da177e4
LT		 714 flags |= asoc ? 0 : SCTP_CHUNK_FLAG_T;
715
716 retval = sctp_make_chunk(asoc, SCTP_CID_SHUTDOWN_COMPLETE, flags, 0);
717
718 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
719 *
720 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
721 * HEARTBEAT ACK, * etc.) to the same destination transport
722 * address from which it * received the DATA or control chunk
723 * to which it is replying.
724 *
725 * [Report SHUTDOWN COMPLETE back to where the SHUTDOWN ACK
726 * came from.]
727 */
728 if (retval && chunk)
729 retval->transport = chunk->transport;
730
731 return retval;
732}
733
734/* Create an ABORT. Note that we set the T bit if we have no
047a2428 735 * association, except when responding to an INIT (sctpimpguide 2.41).
1da177e4
LT		 736 */
737struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
738 const struct sctp_chunk *chunk,
739 const size_t hint)
740{
741 struct sctp_chunk *retval;
742 __u8 flags = 0;
743
047a2428
JF		 744 /* Set the T-bit if we have no association and 'chunk' is not
745 * an INIT (vtag will be reflected).
746 */
747 if (!asoc) {
748 if (chunk && chunk->chunk_hdr &&
749 chunk->chunk_hdr->type == SCTP_CID_INIT)
750 flags = 0;
751 else
752 flags = SCTP_CHUNK_FLAG_T;
753 }
1da177e4
LT		 754
755 retval = sctp_make_chunk(asoc, SCTP_CID_ABORT, flags, hint);
756
757 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
758 *
759 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
760 * HEARTBEAT ACK, * etc.) to the same destination transport
761 * address from which it * received the DATA or control chunk
762 * to which it is replying.
763 *
764 * [ABORT back to where the offender came from.]
765 */
766 if (retval && chunk)
767 retval->transport = chunk->transport;
768
769 return retval;
770}
771
772/* Helper to create ABORT with a NO_USER_DATA error. */
773struct sctp_chunk *sctp_make_abort_no_data(
774 const struct sctp_association *asoc,
775 const struct sctp_chunk *chunk, __u32 tsn)
776{
777 struct sctp_chunk *retval;
778 __u32 payload;
779
780 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t)
781 + sizeof(tsn));
782
783 if (!retval)
784 goto no_mem;
785
786 /* Put the tsn back into network byte order. */
787 payload = htonl(tsn);
788 sctp_init_cause(retval, SCTP_ERROR_NO_DATA, (const void *)&payload,
789 sizeof(payload));
790
791 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
792 *
793 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
794 * HEARTBEAT ACK, * etc.) to the same destination transport
795 * address from which it * received the DATA or control chunk
796 * to which it is replying.
797 *
798 * [ABORT back to where the offender came from.]
799 */
800 if (chunk)
801 retval->transport = chunk->transport;
802
803no_mem:
804 return retval;
805}
806
807/* Helper to create ABORT with a SCTP_ERROR_USER_ABORT error. */
808struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
c164a9ba
SS		 809 const struct msghdr *msg,
810 size_t paylen)
1da177e4
LT		 811{
812 struct sctp_chunk *retval;
c164a9ba
SS		 813 void *payload = NULL;
814 int err;
1da177e4 815
c164a9ba 816 retval = sctp_make_abort(asoc, NULL, sizeof(sctp_errhdr_t) + paylen);
1da177e4
LT		 817 if (!retval)
818 goto err_chunk;
819
820 if (paylen) {
821 /* Put the msg_iov together into payload. */
c164a9ba 822 payload = kmalloc(paylen, GFP_KERNEL);
1da177e4
LT		 823 if (!payload)
824 goto err_payload;
c164a9ba
SS		 825
826 err = memcpy_fromiovec(payload, msg->msg_iov, paylen);
827 if (err < 0)
828 goto err_copy;
1da177e4
LT		 829 }
830
831 sctp_init_cause(retval, SCTP_ERROR_USER_ABORT, payload, paylen);
832
833 if (paylen)
834 kfree(payload);
835
836 return retval;
837
838err_copy:
839 kfree(payload);
840err_payload:
841 sctp_chunk_free(retval);
842 retval = NULL;
843err_chunk:
844 return retval;
845}
846
847/* Make an ABORT chunk with a PROTOCOL VIOLATION cause code. */
848struct sctp_chunk *sctp_make_abort_violation(
849 const struct sctp_association *asoc,
850 const struct sctp_chunk *chunk,
851 const __u8 *payload,
852 const size_t paylen)
853{
854 struct sctp_chunk *retval;
855 struct sctp_paramhdr phdr;
856
857 retval = sctp_make_abort(asoc, chunk, sizeof(sctp_errhdr_t) + paylen
858 + sizeof(sctp_chunkhdr_t));
859 if (!retval)
860 goto end;
861
862 sctp_init_cause(retval, SCTP_ERROR_PROTO_VIOLATION, payload, paylen);
863
864 phdr.type = htons(chunk->chunk_hdr->type);
865 phdr.length = chunk->chunk_hdr->length;
866 sctp_addto_chunk(retval, sizeof(sctp_paramhdr_t), &phdr);
867
868end:
869 return retval;
870}
871
872/* Make a HEARTBEAT chunk. */
873struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
874 const struct sctp_transport *transport,
875 const void *payload, const size_t paylen)
876{
877 struct sctp_chunk *retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT,
878 0, paylen);
879
880 if (!retval)
881 goto nodata;
882
883 /* Cast away the 'const', as this is just telling the chunk
884 * what transport it belongs to.
885 */
886 retval->transport = (struct sctp_transport *) transport;
887 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
888
889nodata:
890 return retval;
891}
892
893struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
894 const struct sctp_chunk *chunk,
895 const void *payload, const size_t paylen)
896{
897 struct sctp_chunk *retval;
898
899 retval = sctp_make_chunk(asoc, SCTP_CID_HEARTBEAT_ACK, 0, paylen);
900 if (!retval)
901 goto nodata;
902
903 retval->subh.hbs_hdr = sctp_addto_chunk(retval, paylen, payload);
904
905 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
906 *
907 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
908 * HEARTBEAT ACK, * etc.) to the same destination transport
909 * address from which it * received the DATA or control chunk
910 * to which it is replying.
911 *
912 * [HBACK back to where the HEARTBEAT came from.]
913 */
914 if (chunk)
915 retval->transport = chunk->transport;
916
917nodata:
918 return retval;
919}
920
921/* Create an Operation Error chunk with the specified space reserved.
922 * This routine can be used for containing multiple causes in the chunk.
923 */
924static struct sctp_chunk *sctp_make_op_error_space(
925 const struct sctp_association *asoc,
926 const struct sctp_chunk *chunk,
927 size_t size)
928{
929 struct sctp_chunk *retval;
930
931 retval = sctp_make_chunk(asoc, SCTP_CID_ERROR, 0,
932 sizeof(sctp_errhdr_t) + size);
933 if (!retval)
934 goto nodata;
935
936 /* RFC 2960 6.4 Multi-homed SCTP Endpoints
937 *
938 * An endpoint SHOULD transmit reply chunks (e.g., SACK,
939 * HEARTBEAT ACK, etc.) to the same destination transport
940 * address from which it received the DATA or control chunk
941 * to which it is replying.
942 *
943 */
944 if (chunk)
945 retval->transport = chunk->transport;
946
947nodata:
948 return retval;
949}
950
951/* Create an Operation Error chunk. */
952struct sctp_chunk *sctp_make_op_error(const struct sctp_association *asoc,
953 const struct sctp_chunk *chunk,
63706c5c 954 __be16 cause_code, const void *payload,
1da177e4
LT		 955 size_t paylen)
956{
957 struct sctp_chunk *retval;
958
959 retval = sctp_make_op_error_space(asoc, chunk, paylen);
960 if (!retval)
961 goto nodata;
962
963 sctp_init_cause(retval, cause_code, payload, paylen);
964
965nodata:
966 return retval;
967}
968
969/********************************************************************
970 * 2nd Level Abstractions
971 ********************************************************************/
972
973/* Turn an skb into a chunk.
974 * FIXME: Eventually move the structure directly inside the skb->cb[].
975 */
976struct sctp_chunk *sctp_chunkify(struct sk_buff *skb,
977 const struct sctp_association *asoc,
978 struct sock *sk)
979{
980 struct sctp_chunk *retval;
981
982 retval = kmem_cache_alloc(sctp_chunk_cachep, SLAB_ATOMIC);
983
984 if (!retval)
985 goto nodata;
986 memset(retval, 0, sizeof(struct sctp_chunk));
987
988 if (!sk) {
989 SCTP_DEBUG_PRINTK("chunkifying skb %p w/o an sk\n", skb);
990 }
991
79af02c2 992 INIT_LIST_HEAD(&retval->list);
1da177e4
LT		 993 retval->skb = skb;
994 retval->asoc = (struct sctp_association *)asoc;
995 retval->resent = 0;
996 retval->has_tsn = 0;
997 retval->has_ssn = 0;
998 retval->rtt_in_progress = 0;
999 retval->sent_at = 0;
1000 retval->singleton = 1;
1001 retval->end_of_packet = 0;
1002 retval->ecn_ce_done = 0;
1003 retval->pdiscard = 0;
1004
1005 /* sctpimpguide-05.txt Section 2.8.2
1006 * M1) Each time a new DATA chunk is transmitted
1007 * set the 'TSN.Missing.Report' count for that TSN to 0. The
1008 * 'TSN.Missing.Report' count will be used to determine missing chunks
1009 * and when to fast retransmit.
1010 */
1011 retval->tsn_missing_report = 0;
1012 retval->tsn_gap_acked = 0;
1013 retval->fast_retransmit = 0;
1014
1015 /* If this is a fragmented message, track all fragments
1016 * of the message (for SEND_FAILED).
1017 */
1018 retval->msg = NULL;
1019
1020 /* Polish the bead hole. */
1021 INIT_LIST_HEAD(&retval->transmitted_list);
1022 INIT_LIST_HEAD(&retval->frag_list);
1023 SCTP_DBG_OBJCNT_INC(chunk);
1024 atomic_set(&retval->refcnt, 1);
1025
1026nodata:
1027 return retval;
1028}
1029
1030/* Set chunk->source and dest based on the IP header in chunk->skb. */
1031void sctp_init_addrs(struct sctp_chunk *chunk, union sctp_addr *src,
1032 union sctp_addr *dest)
1033{
f235fca3
AV		 1034 memcpy(&chunk->source, src, sizeof(union sctp_addr));
1035 flip_to_h(&chunk->source_h, &chunk->source);
1036 flip_to_h(&chunk->dest, dest);
1da177e4
LT		 1037}
1038
1039/* Extract the source address from a chunk. */
1040const union sctp_addr *sctp_source(const struct sctp_chunk *chunk)
1041{
1042 /* If we have a known transport, use that. */
1043 if (chunk->transport) {
09ef7fec 1044 return &chunk->transport->ipaddr_h;
1da177e4
LT		 1045 } else {
1046 /* Otherwise, extract it from the IP header. */
09ef7fec 1047 return &chunk->source_h;
1da177e4
LT		 1048 }
1049}
1050
1051/* Create a new chunk, setting the type and flags headers from the
1052 * arguments, reserving enough space for a 'paylen' byte payload.
1053 */
1054SCTP_STATIC
1055struct sctp_chunk *sctp_make_chunk(const struct sctp_association *asoc,
1056 __u8 type, __u8 flags, int paylen)
1057{
1058 struct sctp_chunk *retval;
1059 sctp_chunkhdr_t *chunk_hdr;
1060 struct sk_buff *skb;
1061 struct sock *sk;
1062
1063 /* No need to allocate LL here, as this is only a chunk. */
1064 skb = alloc_skb(WORD_ROUND(sizeof(sctp_chunkhdr_t) + paylen),
1065 GFP_ATOMIC);
1066 if (!skb)
1067 goto nodata;
1068
1069 /* Make room for the chunk header. */
1070 chunk_hdr = (sctp_chunkhdr_t *)skb_put(skb, sizeof(sctp_chunkhdr_t));
1071 chunk_hdr->type = type;
1072 chunk_hdr->flags = flags;
1073 chunk_hdr->length = htons(sizeof(sctp_chunkhdr_t));
1074
1075 sk = asoc ? asoc->base.sk : NULL;
1076 retval = sctp_chunkify(skb, asoc, sk);
1077 if (!retval) {
1078 kfree_skb(skb);
1079 goto nodata;
1080 }
1081
1082 retval->chunk_hdr = chunk_hdr;
1083 retval->chunk_end = ((__u8 *)chunk_hdr) + sizeof(struct sctp_chunkhdr);
1084
1085 /* Set the skb to the belonging sock for accounting. */
1086 skb->sk = sk;
1087
1088 return retval;
1089nodata:
1090 return NULL;
1091}
1092
1093
1094/* Release the memory occupied by a chunk. */
1095static void sctp_chunk_destroy(struct sctp_chunk *chunk)
1096{
1097 /* Free the chunk skb data and the SCTP_chunk stub itself. */
1098 dev_kfree_skb(chunk->skb);
1099
1100 SCTP_DBG_OBJCNT_DEC(chunk);
1101 kmem_cache_free(sctp_chunk_cachep, chunk);
1102}
1103
1104/* Possibly, free the chunk. */
1105void sctp_chunk_free(struct sctp_chunk *chunk)
1106{
79af02c2 1107 BUG_ON(!list_empty(&chunk->list));
1da177e4
LT		 1108 list_del_init(&chunk->transmitted_list);
1109
1110 /* Release our reference on the message tracker. */
1111 if (chunk->msg)
1112 sctp_datamsg_put(chunk->msg);
1113
1114 sctp_chunk_put(chunk);
1115}
1116
1117/* Grab a reference to the chunk. */
1118void sctp_chunk_hold(struct sctp_chunk *ch)
1119{
1120 atomic_inc(&ch->refcnt);
1121}
1122
1123/* Release a reference to the chunk. */
1124void sctp_chunk_put(struct sctp_chunk *ch)
1125{
1126 if (atomic_dec_and_test(&ch->refcnt))
1127 sctp_chunk_destroy(ch);
1128}
1129
1130/* Append bytes to the end of a chunk. Will panic if chunk is not big
1131 * enough.
1132 */
1133void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
1134{
1135 void *target;
1136 void *padding;
1137 int chunklen = ntohs(chunk->chunk_hdr->length);
1138 int padlen = chunklen % 4;
1139
1140 padding = skb_put(chunk->skb, padlen);
1141 target = skb_put(chunk->skb, len);
1142
1143 memset(padding, 0, padlen);
1144 memcpy(target, data, len);
1145
1146 /* Adjust the chunk length field. */
1147 chunk->chunk_hdr->length = htons(chunklen + padlen + len);
1148 chunk->chunk_end = chunk->skb->tail;
1149
1150 return target;
1151}
1152
1153/* Append bytes from user space to the end of a chunk. Will panic if
1154 * chunk is not big enough.
1155 * Returns a kernel err value.
1156 */
1157int sctp_user_addto_chunk(struct sctp_chunk *chunk, int off, int len,
1158 struct iovec *data)
1159{
1160 __u8 *target;
1161 int err = 0;
1162
1163 /* Make room in chunk for data. */
1164 target = skb_put(chunk->skb, len);
1165
1166 /* Copy data (whole iovec) into chunk */
1167 if ((err = memcpy_fromiovecend(target, data, off, len)))
1168 goto out;
1169
1170 /* Adjust the chunk length field. */
1171 chunk->chunk_hdr->length =
1172 htons(ntohs(chunk->chunk_hdr->length) + len);
1173 chunk->chunk_end = chunk->skb->tail;
1174
1175out:
1176 return err;
1177}
1178
1179/* Helper function to assign a TSN if needed. This assumes that both
1180 * the data_hdr and association have already been assigned.
1181 */
1182void sctp_chunk_assign_ssn(struct sctp_chunk *chunk)
1183{
1184 __u16 ssn;
1185 __u16 sid;
1186
1187 if (chunk->has_ssn)
1188 return;
1189
1190 /* This is the last possible instant to assign a SSN. */
1191 if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
1192 ssn = 0;
1193 } else {
dbc16db1 1194 sid = ntohs(chunk->subh.data_hdr->stream);
1da177e4
LT		 1195 if (chunk->chunk_hdr->flags & SCTP_DATA_LAST_FRAG)
1196 ssn = sctp_ssn_next(&chunk->asoc->ssnmap->out, sid);
1197 else
1198 ssn = sctp_ssn_peek(&chunk->asoc->ssnmap->out, sid);
1199 ssn = htons(ssn);
1200 }
1201
1202 chunk->subh.data_hdr->ssn = ssn;
1203 chunk->has_ssn = 1;
1204}
1205
1206/* Helper function to assign a TSN if needed. This assumes that both
1207 * the data_hdr and association have already been assigned.
1208 */
1209void sctp_chunk_assign_tsn(struct sctp_chunk *chunk)
1210{
1211 if (!chunk->has_tsn) {
1212 /* This is the last possible instant to
1213 * assign a TSN.
1214 */
1215 chunk->subh.data_hdr->tsn =
1216 htonl(sctp_association_get_next_tsn(chunk->asoc));
1217 chunk->has_tsn = 1;
1218 }
1219}
1220
1221/* Create a CLOSED association to use with an incoming packet. */
1222struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *ep,
3182cd84 1223 struct sctp_chunk *chunk,
dd0fc66f 1224 gfp_t gfp)
1da177e4
LT		 1225{
1226 struct sctp_association *asoc;
1227 struct sk_buff *skb;
1228 sctp_scope_t scope;
1229 struct sctp_af *af;
1230
1231 /* Create the bare association. */
1232 scope = sctp_scope(sctp_source(chunk));
1233 asoc = sctp_association_new(ep, ep->base.sk, scope, gfp);
1234 if (!asoc)
1235 goto nodata;
1236 asoc->temp = 1;
1237 skb = chunk->skb;
1238 /* Create an entry for the source address of the packet. */
1239 af = sctp_get_af_specific(ipver2af(skb->nh.iph->version));
1240 if (unlikely(!af))
1241 goto fail;
d55c41b1 1242 af->from_skb(&asoc->c.peer_addr, skb, 1);
1da177e4
LT		 1243nodata:
1244 return asoc;
1245
1246fail:
1247 sctp_association_free(asoc);
1248 return NULL;
1249}
1250
1251/* Build a cookie representing asoc.
1252 * This INCLUDES the param header needed to put the cookie in the INIT ACK.
1253 */
1254static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
1255 const struct sctp_association *asoc,
1256 const struct sctp_chunk *init_chunk,
1257 int *cookie_len,
1258 const __u8 *raw_addrs, int addrs_len)
1259{
1260 sctp_cookie_param_t *retval;
1261 struct sctp_signed_cookie *cookie;
1262 struct scatterlist sg;
1263 int headersize, bodysize;
1264 unsigned int keylen;
1265 char *key;
1266
9834a2bb
VY		 1267 /* Header size is static data prior to the actual cookie, including
1268 * any padding.
1269 */
1270 headersize = sizeof(sctp_paramhdr_t) +
1271 (sizeof(struct sctp_signed_cookie) -
1272 sizeof(struct sctp_cookie));
1da177e4
LT		 1273 bodysize = sizeof(struct sctp_cookie)
1274 + ntohs(init_chunk->chunk_hdr->length) + addrs_len;
1275
1276 /* Pad out the cookie to a multiple to make the signature
1277 * functions simpler to write.
1278 */
1279 if (bodysize % SCTP_COOKIE_MULTIPLE)
1280 bodysize += SCTP_COOKIE_MULTIPLE
1281 - (bodysize % SCTP_COOKIE_MULTIPLE);
1282 *cookie_len = headersize + bodysize;
1283
8b3a7005 1284 retval = kmalloc(*cookie_len, GFP_ATOMIC);
1da177e4 1285
1b489e11 1286 if (!retval)
1da177e4 1287 goto nodata;
1da177e4
LT		 1288
1289 /* Clear this memory since we are sending this data structure
1290 * out on the network.
1291 */
1292 memset(retval, 0x00, *cookie_len);
1293 cookie = (struct sctp_signed_cookie *) retval->body;
1294
1295 /* Set up the parameter header. */
1296 retval->p.type = SCTP_PARAM_STATE_COOKIE;
1297 retval->p.length = htons(*cookie_len);
1298
1299 /* Copy the cookie part of the association itself. */
1300 cookie->c = asoc->c;
1301 /* Save the raw address list length in the cookie. */
1302 cookie->c.raw_addr_list_len = addrs_len;
1303
1304 /* Remember PR-SCTP capability. */
1305 cookie->c.prsctp_capable = asoc->peer.prsctp_capable;
1306
1307 /* Save adaption indication in the cookie. */
1308 cookie->c.adaption_ind = asoc->peer.adaption_ind;
1309
1310 /* Set an expiration time for the cookie. */
1311 do_gettimeofday(&cookie->c.expiration);
1312 TIMEVAL_ADD(asoc->cookie_life, cookie->c.expiration);
1313
1314 /* Copy the peer's init packet. */
1315 memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
1316 ntohs(init_chunk->chunk_hdr->length));
1317
1318 /* Copy the raw local address list of the association. */
1319 memcpy((__u8 *)&cookie->c.peer_init[0] +
1320 ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
1321
1322 if (sctp_sk(ep->base.sk)->hmac) {
1b489e11
HX		 1323 struct hash_desc desc;
1324
1da177e4
LT		 1325 /* Sign the message. */
1326 sg.page = virt_to_page(&cookie->c);
1327 sg.offset = (unsigned long)(&cookie->c) % PAGE_SIZE;
1328 sg.length = bodysize;
1329 keylen = SCTP_SECRET_SIZE;
1330 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1331 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1332 desc.flags = 0;
1da177e4 1333
1b489e11
HX		 1334 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1335 crypto_hash_digest(&desc, &sg, bodysize, cookie->signature))
1336 goto free_cookie;
1da177e4
LT		 1337 }
1338
1da177e4 1339 return retval;
1b489e11
HX		 1340
1341free_cookie:
1342 kfree(retval);
1343nodata:
1344 *cookie_len = 0;
1345 return NULL;
1da177e4
LT		 1346}
1347
1348/* Unpack the cookie from COOKIE ECHO chunk, recreating the association. */
1349struct sctp_association *sctp_unpack_cookie(
1350 const struct sctp_endpoint *ep,
1351 const struct sctp_association *asoc,
dd0fc66f 1352 struct sctp_chunk *chunk, gfp_t gfp,
1da177e4
LT		 1353 int *error, struct sctp_chunk **errp)
1354{
1355 struct sctp_association *retval = NULL;
1356 struct sctp_signed_cookie *cookie;
1357 struct sctp_cookie *bear_cookie;
1358 int headersize, bodysize, fixed_size;
313e7b4d 1359 __u8 *digest = ep->digest;
1da177e4
LT		 1360 struct scatterlist sg;
1361 unsigned int keylen, len;
1362 char *key;
1363 sctp_scope_t scope;
1364 struct sk_buff *skb = chunk->skb;
a61bbcf2 1365 struct timeval tv;
1b489e11 1366 struct hash_desc desc;
1da177e4 1367
9834a2bb
VY		 1368 /* Header size is static data prior to the actual cookie, including
1369 * any padding.
1370 */
1371 headersize = sizeof(sctp_chunkhdr_t) +
1372 (sizeof(struct sctp_signed_cookie) -
1373 sizeof(struct sctp_cookie));
1da177e4
LT		 1374 bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
1375 fixed_size = headersize + sizeof(struct sctp_cookie);
1376
1377 /* Verify that the chunk looks like it even has a cookie.
1378 * There must be enough room for our cookie and our peer's
1379 * INIT chunk.
1380 */
1381 len = ntohs(chunk->chunk_hdr->length);
1382 if (len < fixed_size + sizeof(struct sctp_chunkhdr))
1383 goto malformed;
1384
1385 /* Verify that the cookie has been padded out. */
1386 if (bodysize % SCTP_COOKIE_MULTIPLE)
1387 goto malformed;
1388
1389 /* Process the cookie. */
1390 cookie = chunk->subh.cookie_hdr;
1391 bear_cookie = &cookie->c;
1392
1393 if (!sctp_sk(ep->base.sk)->hmac)
1394 goto no_hmac;
1395
1396 /* Check the signature. */
1397 keylen = SCTP_SECRET_SIZE;
1398 sg.page = virt_to_page(bear_cookie);
1399 sg.offset = (unsigned long)(bear_cookie) % PAGE_SIZE;
1400 sg.length = bodysize;
1401 key = (char *)ep->secret_key[ep->current_key];
1b489e11
HX		 1402 desc.tfm = sctp_sk(ep->base.sk)->hmac;
1403 desc.flags = 0;
1da177e4 1404
8ca84481 1405 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1406 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1407 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1408 *error = -SCTP_IERROR_NOMEM;
1409 goto fail;
1410 }
1da177e4
LT		 1411
1412 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1413 /* Try the previous key. */
1414 key = (char *)ep->secret_key[ep->last_key];
8ca84481 1415 memset(digest, 0x00, SCTP_SIGNATURE_SIZE);
1b489e11
HX		 1416 if (crypto_hash_setkey(desc.tfm, key, keylen) ||
1417 crypto_hash_digest(&desc, &sg, bodysize, digest)) {
1418 *error = -SCTP_IERROR_NOMEM;
1419 goto fail;
1420 }
1da177e4
LT		 1421
1422 if (memcmp(digest, cookie->signature, SCTP_SIGNATURE_SIZE)) {
1423 /* Yikes! Still bad signature! */
1424 *error = -SCTP_IERROR_BAD_SIG;
1425 goto fail;
1426 }
1427 }
1428
1429no_hmac:
1430 /* IG Section 2.35.2:
1431 * 3) Compare the port numbers and the verification tag contained
1432 * within the COOKIE ECHO chunk to the actual port numbers and the
1433 * verification tag within the SCTP common header of the received
1434 * packet. If these values do not match the packet MUST be silently
1435 * discarded,
1436 */
1437 if (ntohl(chunk->sctp_hdr->vtag) != bear_cookie->my_vtag) {
1438 *error = -SCTP_IERROR_BAD_TAG;
1439 goto fail;
1440 }
1441
9b1dfad0 1442 if (chunk->sctp_hdr->source != bear_cookie->peer_addr.v4.sin_port ||
1da177e4
LT		 1443 ntohs(chunk->sctp_hdr->dest) != bear_cookie->my_port) {
1444 *error = -SCTP_IERROR_BAD_PORTS;
1445 goto fail;
1446 }
1447
1448 /* Check to see if the cookie is stale. If there is already
1449 * an association, there is no need to check cookie's expiration
1450 * for init collision case of lost COOKIE ACK.
f236218b
VY		 1451 * If skb has been timestamped, then use the stamp, otherwise
1452 * use current time. This introduces a small possibility that
1453 * that a cookie may be considered expired, but his would only slow
1454 * down the new association establishment instead of every packet.
1da177e4 1455 */
f236218b
VY		 1456 if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
1457 skb_get_timestamp(skb, &tv);
1458 else
1459 do_gettimeofday(&tv);
1460
a61bbcf2 1461 if (!asoc && tv_lt(bear_cookie->expiration, tv)) {
1da177e4
LT		 1462 __u16 len;
1463 /*
1464 * Section 3.3.10.3 Stale Cookie Error (3)
1465 *
1466 * Cause of error
1467 * ---------------
1468 * Stale Cookie Error: Indicates the receipt of a valid State
1469 * Cookie that has expired.
1470 */
1471 len = ntohs(chunk->chunk_hdr->length);
1472 *errp = sctp_make_op_error_space(asoc, chunk, len);
1473 if (*errp) {
a61bbcf2 1474 suseconds_t usecs = (tv.tv_sec -
1da177e4 1475 bear_cookie->expiration.tv_sec) * 1000000L +
a61bbcf2 1476 tv.tv_usec - bear_cookie->expiration.tv_usec;
1da177e4
LT		 1477
1478 usecs = htonl(usecs);
1479 sctp_init_cause(*errp, SCTP_ERROR_STALE_COOKIE,
1480 &usecs, sizeof(usecs));
1481 *error = -SCTP_IERROR_STALE_COOKIE;
1482 } else
1483 *error = -SCTP_IERROR_NOMEM;
1484
1485 goto fail;
1486 }
1487
1488 /* Make a new base association. */
1489 scope = sctp_scope(sctp_source(chunk));
1490 retval = sctp_association_new(ep, ep->base.sk, scope, gfp);
1491 if (!retval) {
1492 *error = -SCTP_IERROR_NOMEM;
1493 goto fail;
1494 }
1495
1496 /* Set up our peer's port number. */
1497 retval->peer.port = ntohs(chunk->sctp_hdr->source);
1498
1499 /* Populate the association from the cookie. */
1500 memcpy(&retval->c, bear_cookie, sizeof(*bear_cookie));
1501
1502 if (sctp_assoc_set_bind_addr_from_cookie(retval, bear_cookie,
1503 GFP_ATOMIC) < 0) {
1504 *error = -SCTP_IERROR_NOMEM;
1505 goto fail;
1506 }
1507
1508 /* Also, add the destination address. */
1509 if (list_empty(&retval->base.bind_addr.address_list)) {
5ab7b859
AV		 1510 union sctp_addr tmp;
1511 flip_to_n(&tmp, &chunk->dest);
1512 sctp_add_bind_addr(&retval->base.bind_addr, &tmp, 1,
1da177e4
LT		 1513 GFP_ATOMIC);
1514 }
1515
1516 retval->next_tsn = retval->c.initial_tsn;
1517 retval->ctsn_ack_point = retval->next_tsn - 1;
1518 retval->addip_serial = retval->c.initial_tsn;
1519 retval->adv_peer_ack_point = retval->ctsn_ack_point;
1520 retval->peer.prsctp_capable = retval->c.prsctp_capable;
1521 retval->peer.adaption_ind = retval->c.adaption_ind;
1522
1523 /* The INIT stuff will be done by the side effects. */
1524 return retval;
1525
1526fail:
1527 if (retval)
1528 sctp_association_free(retval);
1529
1530 return NULL;
1531
1532malformed:
1533 /* Yikes! The packet is either corrupt or deliberately
1534 * malformed.
1535 */
1536 *error = -SCTP_IERROR_MALFORMED;
1537 goto fail;
1538}
1539
1540/********************************************************************
1541 * 3rd Level Abstractions
1542 ********************************************************************/
1543
1544struct __sctp_missing {
1545 __u32 num_missing;
1546 __u16 type;
1547} __attribute__((packed));
1548
1549/*
1550 * Report a missing mandatory parameter.
1551 */
1552static int sctp_process_missing_param(const struct sctp_association *asoc,
1553 sctp_param_t paramtype,
1554 struct sctp_chunk *chunk,
1555 struct sctp_chunk **errp)
1556{
1557 struct __sctp_missing report;
1558 __u16 len;
1559
1560 len = WORD_ROUND(sizeof(report));
1561
1562 /* Make an ERROR chunk, preparing enough room for
1563 * returning multiple unknown parameters.
1564 */
1565 if (!*errp)
1566 *errp = sctp_make_op_error_space(asoc, chunk, len);
1567
1568 if (*errp) {
1569 report.num_missing = htonl(1);
1570 report.type = paramtype;
1571 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM,
1572 &report, sizeof(report));
1573 }
1574
1575 /* Stop processing this chunk. */
1576 return 0;
1577}
1578
1579/* Report an Invalid Mandatory Parameter. */
1580static int sctp_process_inv_mandatory(const struct sctp_association *asoc,
1581 struct sctp_chunk *chunk,
1582 struct sctp_chunk **errp)
1583{
1584 /* Invalid Mandatory Parameter Error has no payload. */
1585
1586 if (!*errp)
1587 *errp = sctp_make_op_error_space(asoc, chunk, 0);
1588
1589 if (*errp)
1590 sctp_init_cause(*errp, SCTP_ERROR_INV_PARAM, NULL, 0);
1591
1592 /* Stop processing this chunk. */
1593 return 0;
1594}
1595
1596static int sctp_process_inv_paramlength(const struct sctp_association *asoc,
1597 struct sctp_paramhdr *param,
1598 const struct sctp_chunk *chunk,
1599 struct sctp_chunk **errp)
1600{
1601 char error[] = "The following parameter had invalid length:";
1602 size_t payload_len = WORD_ROUND(sizeof(error)) +
1603 sizeof(sctp_paramhdr_t);
1604
1605
1606 /* Create an error chunk and fill it in with our payload. */
1607 if (!*errp)
1608 *errp = sctp_make_op_error_space(asoc, chunk, payload_len);
1609
1610 if (*errp) {
1611 sctp_init_cause(*errp, SCTP_ERROR_PROTO_VIOLATION, error,
1612 sizeof(error));
1613 sctp_addto_chunk(*errp, sizeof(sctp_paramhdr_t), param);
1614 }
1615
1616 return 0;
1617}
1618
1619
1620/* Do not attempt to handle the HOST_NAME parm. However, do
1621 * send back an indicator to the peer.
1622 */
1623static int sctp_process_hn_param(const struct sctp_association *asoc,
1624 union sctp_params param,
1625 struct sctp_chunk *chunk,
1626 struct sctp_chunk **errp)
1627{
1628 __u16 len = ntohs(param.p->length);
1629
1630 /* Make an ERROR chunk. */
1631 if (!*errp)
1632 *errp = sctp_make_op_error_space(asoc, chunk, len);
1633
1634 if (*errp)
1635 sctp_init_cause(*errp, SCTP_ERROR_DNS_FAILED,
1636 param.v, len);
1637
1638 /* Stop processing this chunk. */
1639 return 0;
1640}
1641
1642/* RFC 3.2.1 & the Implementers Guide 2.2.
1643 *
1644 * The Parameter Types are encoded such that the
1645 * highest-order two bits specify the action that must be
1646 * taken if the processing endpoint does not recognize the
1647 * Parameter Type.
1648 *
1649 * 00 - Stop processing this SCTP chunk and discard it,
1650 * do not process any further chunks within it.
1651 *
1652 * 01 - Stop processing this SCTP chunk and discard it,
1653 * do not process any further chunks within it, and report
1654 * the unrecognized parameter in an 'Unrecognized
1655 * Parameter Type' (in either an ERROR or in the INIT ACK).
1656 *
1657 * 10 - Skip this parameter and continue processing.
1658 *
1659 * 11 - Skip this parameter and continue processing but
1660 * report the unrecognized parameter in an
1661 * 'Unrecognized Parameter Type' (in either an ERROR or in
1662 * the INIT ACK).
1663 *
1664 * Return value:
1665 * 0 - discard the chunk
1666 * 1 - continue with the chunk
1667 */
1668static int sctp_process_unk_param(const struct sctp_association *asoc,
1669 union sctp_params param,
1670 struct sctp_chunk *chunk,
1671 struct sctp_chunk **errp)
1672{
1673 int retval = 1;
1674
1675 switch (param.p->type & SCTP_PARAM_ACTION_MASK) {
1676 case SCTP_PARAM_ACTION_DISCARD:
1677 retval = 0;
1678 break;
1679 case SCTP_PARAM_ACTION_DISCARD_ERR:
1680 retval = 0;
1681 /* Make an ERROR chunk, preparing enough room for
1682 * returning multiple unknown parameters.
1683 */
1684 if (NULL == *errp)
1685 *errp = sctp_make_op_error_space(asoc, chunk,
1686 ntohs(chunk->chunk_hdr->length));
1687
1688 if (*errp)
1689 sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1690 param.v,
1691 WORD_ROUND(ntohs(param.p->length)));
1692
1693 break;
1694 case SCTP_PARAM_ACTION_SKIP:
1695 break;
1696 case SCTP_PARAM_ACTION_SKIP_ERR:
1697 /* Make an ERROR chunk, preparing enough room for
1698 * returning multiple unknown parameters.
1699 */
1700 if (NULL == *errp)
1701 *errp = sctp_make_op_error_space(asoc, chunk,
1702 ntohs(chunk->chunk_hdr->length));
1703
1704 if (*errp) {
1705 sctp_init_cause(*errp, SCTP_ERROR_UNKNOWN_PARAM,
1706 param.v,
1707 WORD_ROUND(ntohs(param.p->length)));
1708 } else {
1709 /* If there is no memory for generating the ERROR
1710 * report as specified, an ABORT will be triggered
1711 * to the peer and the association won't be
1712 * established.
1713 */
1714 retval = 0;
1715 }
1716
1717 break;
1718 default:
1719 break;
1720 }
1721
1722 return retval;
1723}
1724
1725/* Find unrecognized parameters in the chunk.
1726 * Return values:
1727 * 0 - discard the chunk
1728 * 1 - continue with the chunk
1729 */
1730static int sctp_verify_param(const struct sctp_association *asoc,
1731 union sctp_params param,
1732 sctp_cid_t cid,
1733 struct sctp_chunk *chunk,
1734 struct sctp_chunk **err_chunk)
1735{
1736 int retval = 1;
1737
1738 /* FIXME - This routine is not looking at each parameter per the
1739 * chunk type, i.e., unrecognized parameters should be further
1740 * identified based on the chunk id.
1741 */
1742
1743 switch (param.p->type) {
1744 case SCTP_PARAM_IPV4_ADDRESS:
1745 case SCTP_PARAM_IPV6_ADDRESS:
1746 case SCTP_PARAM_COOKIE_PRESERVATIVE:
1747 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
1748 case SCTP_PARAM_STATE_COOKIE:
1749 case SCTP_PARAM_HEARTBEAT_INFO:
1750 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
1751 case SCTP_PARAM_ECN_CAPABLE:
1752 case SCTP_PARAM_ADAPTION_LAYER_IND:
1753 break;
1754
1755 case SCTP_PARAM_HOST_NAME_ADDRESS:
1756 /* Tell the peer, we won't support this param. */
1757 return sctp_process_hn_param(asoc, param, chunk, err_chunk);
1758 case SCTP_PARAM_FWD_TSN_SUPPORT:
1759 if (sctp_prsctp_enable)
1760 break;
1761 /* Fall Through */
1762 default:
1763 SCTP_DEBUG_PRINTK("Unrecognized param: %d for chunk %d.\n",
1764 ntohs(param.p->type), cid);
1765 return sctp_process_unk_param(asoc, param, chunk, err_chunk);
1766
1767 break;
1768 }
1769 return retval;
1770}
1771
1772/* Verify the INIT packet before we process it. */
1773int sctp_verify_init(const struct sctp_association *asoc,
1774 sctp_cid_t cid,
1775 sctp_init_chunk_t *peer_init,
1776 struct sctp_chunk *chunk,
1777 struct sctp_chunk **errp)
1778{
1779 union sctp_params param;
1780 int has_cookie = 0;
1781
1782 /* Verify stream values are non-zero. */
1783 if ((0 == peer_init->init_hdr.num_outbound_streams) ||
1784 (0 == peer_init->init_hdr.num_inbound_streams)) {
1785
1786 sctp_process_inv_mandatory(asoc, chunk, errp);
1787 return 0;
1788 }
1789
1790 /* Check for missing mandatory parameters. */
1791 sctp_walk_params(param, peer_init, init_hdr.params) {
1792
1793 if (SCTP_PARAM_STATE_COOKIE == param.p->type)
1794 has_cookie = 1;
1795
1796 } /* for (loop through all parameters) */
1797
1798 /* There is a possibility that a parameter length was bad and
1799 * in that case we would have stoped walking the parameters.
1800 * The current param.p would point at the bad one.
1801 * Current consensus on the mailing list is to generate a PROTOCOL
1802 * VIOLATION error. We build the ERROR chunk here and let the normal
1803 * error handling code build and send the packet.
1804 */
1805 if (param.v < (void*)chunk->chunk_end - sizeof(sctp_paramhdr_t)) {
1806 sctp_process_inv_paramlength(asoc, param.p, chunk, errp);
1807 return 0;
1808 }
1809
1810 /* The only missing mandatory param possible today is
1811 * the state cookie for an INIT-ACK chunk.
1812 */
1813 if ((SCTP_CID_INIT_ACK == cid) && !has_cookie) {
1814 sctp_process_missing_param(asoc, SCTP_PARAM_STATE_COOKIE,
1815 chunk, errp);
1816 return 0;
1817 }
1818
1819 /* Find unrecognized parameters. */
1820
1821 sctp_walk_params(param, peer_init, init_hdr.params) {
1822
1823 if (!sctp_verify_param(asoc, param, cid, chunk, errp)) {
1824 if (SCTP_PARAM_HOST_NAME_ADDRESS == param.p->type)
1825 return 0;
1826 else
1827 return 1;
1828 }
1829
1830 } /* for (loop through all parameters) */
1831
1832 return 1;
1833}
1834
1835/* Unpack the parameters in an INIT packet into an association.
1836 * Returns 0 on failure, else success.
1837 * FIXME: This is an association method.
1838 */
1839int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
1840 const union sctp_addr *peer_addr,
dd0fc66f 1841 sctp_init_chunk_t *peer_init, gfp_t gfp)
1da177e4
LT		 1842{
1843 union sctp_params param;
1844 struct sctp_transport *transport;
1845 struct list_head *pos, *temp;
1846 char *cookie;
4bdf4b5f 1847 union sctp_addr tmp;
1da177e4
LT		 1848
1849 /* We must include the address that the INIT packet came from.
1850 * This is the only address that matters for an INIT packet.
1851 * When processing a COOKIE ECHO, we retrieve the from address
1852 * of the INIT from the cookie.
1853 */
1854
1855 /* This implementation defaults to making the first transport
1856 * added as the primary transport. The source address seems to
1857 * be a a better choice than any of the embedded addresses.
1858 */
4bdf4b5f
AV		 1859 if (peer_addr) {
1860 flip_to_n(&tmp, peer_addr);
1861 if(!sctp_assoc_add_peer(asoc, &tmp, gfp, SCTP_ACTIVE))
1da177e4 1862 goto nomem;
4bdf4b5f 1863 }
1da177e4
LT		 1864
1865 /* Process the initialization parameters. */
1866
1867 sctp_walk_params(param, peer_init, init_hdr.params) {
1868
1869 if (!sctp_process_param(asoc, param, peer_addr, gfp))
1870 goto clean_up;
1871 }
1872
3f7a87d2
FF		 1873 /* Walk list of transports, removing transports in the UNKNOWN state. */
1874 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
1875 transport = list_entry(pos, struct sctp_transport, transports);
1876 if (transport->state == SCTP_UNKNOWN) {
1877 sctp_assoc_rm_peer(asoc, transport);
1878 }
1879 }
1880
1da177e4
LT		 1881 /* The fixed INIT headers are always in network byte
1882 * order.
1883 */
1884 asoc->peer.i.init_tag =
1885 ntohl(peer_init->init_hdr.init_tag);
1886 asoc->peer.i.a_rwnd =
1887 ntohl(peer_init->init_hdr.a_rwnd);
1888 asoc->peer.i.num_outbound_streams =
1889 ntohs(peer_init->init_hdr.num_outbound_streams);
1890 asoc->peer.i.num_inbound_streams =
1891 ntohs(peer_init->init_hdr.num_inbound_streams);
1892 asoc->peer.i.initial_tsn =
1893 ntohl(peer_init->init_hdr.initial_tsn);
1894
1895 /* Apply the upper bounds for output streams based on peer's
1896 * number of inbound streams.
1897 */
1898 if (asoc->c.sinit_num_ostreams >
1899 ntohs(peer_init->init_hdr.num_inbound_streams)) {
1900 asoc->c.sinit_num_ostreams =
1901 ntohs(peer_init->init_hdr.num_inbound_streams);
1902 }
1903
1904 if (asoc->c.sinit_max_instreams >
1905 ntohs(peer_init->init_hdr.num_outbound_streams)) {
1906 asoc->c.sinit_max_instreams =
1907 ntohs(peer_init->init_hdr.num_outbound_streams);
1908 }
1909
1910 /* Copy Initiation tag from INIT to VT_peer in cookie. */
1911 asoc->c.peer_vtag = asoc->peer.i.init_tag;
1912
1913 /* Peer Rwnd : Current calculated value of the peer's rwnd. */
1914 asoc->peer.rwnd = asoc->peer.i.a_rwnd;
1915
1916 /* Copy cookie in case we need to resend COOKIE-ECHO. */
1917 cookie = asoc->peer.cookie;
1918 if (cookie) {
1919 asoc->peer.cookie = kmalloc(asoc->peer.cookie_len, gfp);
1920 if (!asoc->peer.cookie)
1921 goto clean_up;
1922 memcpy(asoc->peer.cookie, cookie, asoc->peer.cookie_len);
1923 }
1924
1925 /* RFC 2960 7.2.1 The initial value of ssthresh MAY be arbitrarily
1926 * high (for example, implementations MAY use the size of the receiver
1927 * advertised window).
1928 */
1929 list_for_each(pos, &asoc->peer.transport_addr_list) {
1930 transport = list_entry(pos, struct sctp_transport, transports);
1931 transport->ssthresh = asoc->peer.i.a_rwnd;
1932 }
1933
1934 /* Set up the TSN tracking pieces. */
1935 sctp_tsnmap_init(&asoc->peer.tsn_map, SCTP_TSN_MAP_SIZE,
1936 asoc->peer.i.initial_tsn);
1937
1938 /* RFC 2960 6.5 Stream Identifier and Stream Sequence Number
1939 *
1940 * The stream sequence number in all the streams shall start
1941 * from 0 when the association is established. Also, when the
1942 * stream sequence number reaches the value 65535 the next
1943 * stream sequence number shall be set to 0.
1944 */
1945
3f7a87d2
FF		 1946 /* Allocate storage for the negotiated streams if it is not a temporary
1947 * association.
1da177e4
LT		 1948 */
1949 if (!asoc->temp) {
1950 int assoc_id;
1951 int error;
1952
1953 asoc->ssnmap = sctp_ssnmap_new(asoc->c.sinit_max_instreams,
1954 asoc->c.sinit_num_ostreams, gfp);
1955 if (!asoc->ssnmap)
1956 goto clean_up;
1957
1958 retry:
1959 if (unlikely(!idr_pre_get(&sctp_assocs_id, gfp)))
1960 goto clean_up;
1961 spin_lock_bh(&sctp_assocs_id_lock);
1962 error = idr_get_new_above(&sctp_assocs_id, (void *)asoc, 1,
1963 &assoc_id);
1964 spin_unlock_bh(&sctp_assocs_id_lock);
1965 if (error == -EAGAIN)
1966 goto retry;
1967 else if (error)
1968 goto clean_up;
1969
1970 asoc->assoc_id = (sctp_assoc_t) assoc_id;
1971 }
1972
1973 /* ADDIP Section 4.1 ASCONF Chunk Procedures
1974 *
1975 * When an endpoint has an ASCONF signaled change to be sent to the
1976 * remote endpoint it should do the following:
1977 * ...
1978 * A2) A serial number should be assigned to the Chunk. The serial
1979 * number should be a monotonically increasing number. All serial
1980 * numbers are defined to be initialized at the start of the
1981 * association to the same value as the Initial TSN.
1982 */
1983 asoc->peer.addip_serial = asoc->peer.i.initial_tsn - 1;
1984 return 1;
1985
1986clean_up:
1987 /* Release the transport structures. */
1988 list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
1989 transport = list_entry(pos, struct sctp_transport, transports);
1990 list_del_init(pos);
1991 sctp_transport_free(transport);
1992 }
3f7a87d2
FF		 1993
1994 asoc->peer.transport_count = 0;
1995
1da177e4
LT		 1996nomem:
1997 return 0;
1998}
1999
2000
2001/* Update asoc with the option described in param.
2002 *
2003 * RFC2960 3.3.2.1 Optional/Variable Length Parameters in INIT
2004 *
2005 * asoc is the association to update.
2006 * param is the variable length parameter to use for update.
2007 * cid tells us if this is an INIT, INIT ACK or COOKIE ECHO.
2008 * If the current packet is an INIT we want to minimize the amount of
2009 * work we do. In particular, we should not build transport
2010 * structures for the addresses.
2011 */
2012static int sctp_process_param(struct sctp_association *asoc,
2013 union sctp_params param,
2014 const union sctp_addr *peer_addr,
dd0fc66f 2015 gfp_t gfp)
1da177e4
LT		 2016{
2017 union sctp_addr addr;
2018 int i;
2019 __u16 sat;
2020 int retval = 1;
2021 sctp_scope_t scope;
2022 time_t stale;
2023 struct sctp_af *af;
4bdf4b5f 2024 union sctp_addr tmp;
1da177e4
LT		 2025
2026 /* We maintain all INIT parameters in network byte order all the
2027 * time. This allows us to not worry about whether the parameters
2028 * came from a fresh INIT, and INIT ACK, or were stored in a cookie.
2029 */
2030 switch (param.p->type) {
2031 case SCTP_PARAM_IPV6_ADDRESS:
2032 if (PF_INET6 != asoc->base.sk->sk_family)
2033 break;
2034 /* Fall through. */
2035 case SCTP_PARAM_IPV4_ADDRESS:
2036 af = sctp_get_af_specific(param_type2af(param.p->type));
2037 af->from_addr_param(&addr, param.addr, asoc->peer.port, 0);
4bdf4b5f 2038 flip_to_n(&tmp, &addr);
1da177e4 2039 scope = sctp_scope(peer_addr);
4bdf4b5f
AV		 2040 if (sctp_in_scope(&tmp, scope))
2041 if (!sctp_assoc_add_peer(asoc, &tmp, gfp, SCTP_UNCONFIRMED))
1da177e4
LT		 2042 return 0;
2043 break;
2044
2045 case SCTP_PARAM_COOKIE_PRESERVATIVE:
2046 if (!sctp_cookie_preserve_enable)
2047 break;
2048
2049 stale = ntohl(param.life->lifespan_increment);
2050
2051 /* Suggested Cookie Life span increment's unit is msec,
2052 * (1/1000sec).
2053 */
2054 asoc->cookie_life.tv_sec += stale / 1000;
2055 asoc->cookie_life.tv_usec += (stale % 1000) * 1000;
2056 break;
2057
2058 case SCTP_PARAM_HOST_NAME_ADDRESS:
2059 SCTP_DEBUG_PRINTK("unimplemented SCTP_HOST_NAME_ADDRESS\n");
2060 break;
2061
2062 case SCTP_PARAM_SUPPORTED_ADDRESS_TYPES:
2063 /* Turn off the default values first so we'll know which
2064 * ones are really set by the peer.
2065 */
2066 asoc->peer.ipv4_address = 0;
2067 asoc->peer.ipv6_address = 0;
2068
2069 /* Cycle through address types; avoid divide by 0. */
2070 sat = ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2071 if (sat)
2072 sat /= sizeof(__u16);
2073
2074 for (i = 0; i < sat; ++i) {
2075 switch (param.sat->types[i]) {
2076 case SCTP_PARAM_IPV4_ADDRESS:
2077 asoc->peer.ipv4_address = 1;
2078 break;
2079
2080 case SCTP_PARAM_IPV6_ADDRESS:
2081 asoc->peer.ipv6_address = 1;
2082 break;
2083
2084 case SCTP_PARAM_HOST_NAME_ADDRESS:
2085 asoc->peer.hostname_address = 1;
2086 break;
2087
2088 default: /* Just ignore anything else. */
2089 break;
2090 };
2091 }
2092 break;
2093
2094 case SCTP_PARAM_STATE_COOKIE:
2095 asoc->peer.cookie_len =
2096 ntohs(param.p->length) - sizeof(sctp_paramhdr_t);
2097 asoc->peer.cookie = param.cookie->body;
2098 break;
2099
2100 case SCTP_PARAM_HEARTBEAT_INFO:
2101 /* Would be odd to receive, but it causes no problems. */
2102 break;
2103
2104 case SCTP_PARAM_UNRECOGNIZED_PARAMETERS:
2105 /* Rejected during verify stage. */
2106 break;
2107
2108 case SCTP_PARAM_ECN_CAPABLE:
2109 asoc->peer.ecn_capable = 1;
2110 break;
2111
2112 case SCTP_PARAM_ADAPTION_LAYER_IND:
2113 asoc->peer.adaption_ind = param.aind->adaption_ind;
2114 break;
2115
2116 case SCTP_PARAM_FWD_TSN_SUPPORT:
2117 if (sctp_prsctp_enable) {
2118 asoc->peer.prsctp_capable = 1;
2119 break;
2120 }
2121 /* Fall Through */
2122 default:
2123 /* Any unrecognized parameters should have been caught
2124 * and handled by sctp_verify_param() which should be
2125 * called prior to this routine. Simply log the error
2126 * here.
2127 */
2128 SCTP_DEBUG_PRINTK("Ignoring param: %d for association %p.\n",
2129 ntohs(param.p->type), asoc);
2130 break;
2131 };
2132
2133 return retval;
2134}
2135
2136/* Select a new verification tag. */
2137__u32 sctp_generate_tag(const struct sctp_endpoint *ep)
2138{
2139 /* I believe that this random number generator complies with RFC1750.
2140 * A tag of 0 is reserved for special cases (e.g. INIT).
2141 */
2142 __u32 x;
2143
2144 do {
2145 get_random_bytes(&x, sizeof(__u32));
2146 } while (x == 0);
2147
2148 return x;
2149}
2150
2151/* Select an initial TSN to send during startup. */
2152__u32 sctp_generate_tsn(const struct sctp_endpoint *ep)
2153{
2154 __u32 retval;
2155
2156 get_random_bytes(&retval, sizeof(__u32));
2157 return retval;
2158}
2159
2160/*
2161 * ADDIP 3.1.1 Address Configuration Change Chunk (ASCONF)
2162 * 0 1 2 3
2163 * 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
2164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2165 * | Type = 0xC1 | Chunk Flags | Chunk Length |
2166 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2167 * | Serial Number |
2168 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2169 * | Address Parameter |
2170 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2171 * | ASCONF Parameter #1 |
2172 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2173 * \ \
2174 * / .... /
2175 * \ \
2176 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2177 * | ASCONF Parameter #N |
2178 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2179 *
2180 * Address Parameter and other parameter will not be wrapped in this function
2181 */
2182static struct sctp_chunk *sctp_make_asconf(struct sctp_association *asoc,
2183 union sctp_addr *addr,
2184 int vparam_len)
2185{
2186 sctp_addiphdr_t asconf;
2187 struct sctp_chunk *retval;
2188 int length = sizeof(asconf) + vparam_len;
2189 union sctp_addr_param addrparam;
2190 int addrlen;
2191 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2192
2193 addrlen = af->to_addr_param(addr, &addrparam);
2194 if (!addrlen)
2195 return NULL;
2196 length += addrlen;
2197
2198 /* Create the chunk. */
2199 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF, 0, length);
2200 if (!retval)
2201 return NULL;
2202
2203 asconf.serial = htonl(asoc->addip_serial++);
2204
2205 retval->subh.addip_hdr =
2206 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2207 retval->param_hdr.v =
2208 sctp_addto_chunk(retval, addrlen, &addrparam);
2209
2210 return retval;
2211}
2212
2213/* ADDIP
2214 * 3.2.1 Add IP Address
2215 * 0 1 2 3
2216 * 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
2217 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2218 * | Type = 0xC001 | Length = Variable |
2219 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2220 * | ASCONF-Request Correlation ID |
2221 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2222 * | Address Parameter |
2223 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2224 *
2225 * 3.2.2 Delete IP Address
2226 * 0 1 2 3
2227 * 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
2228 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2229 * | Type = 0xC002 | Length = Variable |
2230 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2231 * | ASCONF-Request Correlation ID |
2232 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2233 * | Address Parameter |
2234 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2235 *
2236 */
2237struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
2238 union sctp_addr *laddr,
2239 struct sockaddr *addrs,
2240 int addrcnt,
dbc16db1 2241 __be16 flags)
1da177e4
LT		 2242{
2243 sctp_addip_param_t param;
2244 struct sctp_chunk *retval;
2245 union sctp_addr_param addr_param;
2246 union sctp_addr *addr;
2247 void *addr_buf;
2248 struct sctp_af *af;
2249 int paramlen = sizeof(param);
2250 int addr_param_len = 0;
2251 int totallen = 0;
2252 int i;
2253
2254 /* Get total length of all the address parameters. */
2255 addr_buf = addrs;
2256 for (i = 0; i < addrcnt; i++) {
2257 addr = (union sctp_addr *)addr_buf;
2258 af = sctp_get_af_specific(addr->v4.sin_family);
2259 addr_param_len = af->to_addr_param(addr, &addr_param);
2260
2261 totallen += paramlen;
2262 totallen += addr_param_len;
2263
2264 addr_buf += af->sockaddr_len;
2265 }
2266
2267 /* Create an asconf chunk with the required length. */
2268 retval = sctp_make_asconf(asoc, laddr, totallen);
2269 if (!retval)
2270 return NULL;
2271
2272 /* Add the address parameters to the asconf chunk. */
2273 addr_buf = addrs;
2274 for (i = 0; i < addrcnt; i++) {
2275 addr = (union sctp_addr *)addr_buf;
2276 af = sctp_get_af_specific(addr->v4.sin_family);
2277 addr_param_len = af->to_addr_param(addr, &addr_param);
2278 param.param_hdr.type = flags;
2279 param.param_hdr.length = htons(paramlen + addr_param_len);
2280 param.crr_id = i;
2281
2282 sctp_addto_chunk(retval, paramlen, &param);
2283 sctp_addto_chunk(retval, addr_param_len, &addr_param);
2284
2285 addr_buf += af->sockaddr_len;
2286 }
2287 return retval;
2288}
2289
2290/* ADDIP
2291 * 3.2.4 Set Primary IP Address
2292 * 0 1 2 3
2293 * 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
2294 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2295 * | Type =0xC004 | Length = Variable |
2296 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2297 * | ASCONF-Request Correlation ID |
2298 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2299 * | Address Parameter |
2300 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2301 *
2302 * Create an ASCONF chunk with Set Primary IP address parameter.
2303 */
2304struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
2305 union sctp_addr *addr)
2306{
2307 sctp_addip_param_t param;
2308 struct sctp_chunk *retval;
2309 int len = sizeof(param);
2310 union sctp_addr_param addrparam;
2311 int addrlen;
2312 struct sctp_af *af = sctp_get_af_specific(addr->v4.sin_family);
2313
2314 addrlen = af->to_addr_param(addr, &addrparam);
2315 if (!addrlen)
2316 return NULL;
2317 len += addrlen;
2318
2319 /* Create the chunk and make asconf header. */
2320 retval = sctp_make_asconf(asoc, addr, len);
2321 if (!retval)
2322 return NULL;
2323
2324 param.param_hdr.type = SCTP_PARAM_SET_PRIMARY;
2325 param.param_hdr.length = htons(len);
2326 param.crr_id = 0;
2327
2328 sctp_addto_chunk(retval, sizeof(param), &param);
2329 sctp_addto_chunk(retval, addrlen, &addrparam);
2330
2331 return retval;
2332}
2333
2334/* ADDIP 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
2335 * 0 1 2 3
2336 * 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
2337 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2338 * | Type = 0x80 | Chunk Flags | Chunk Length |
2339 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2340 * | Serial Number |
2341 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2342 * | ASCONF Parameter Response#1 |
2343 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2344 * \ \
2345 * / .... /
2346 * \ \
2347 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2348 * | ASCONF Parameter Response#N |
2349 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
2350 *
2351 * Create an ASCONF_ACK chunk with enough space for the parameter responses.
2352 */
2353static struct sctp_chunk *sctp_make_asconf_ack(const struct sctp_association *asoc,
2354 __u32 serial, int vparam_len)
2355{
2356 sctp_addiphdr_t asconf;
2357 struct sctp_chunk *retval;
2358 int length = sizeof(asconf) + vparam_len;
2359
2360 /* Create the chunk. */
2361 retval = sctp_make_chunk(asoc, SCTP_CID_ASCONF_ACK, 0, length);
2362 if (!retval)
2363 return NULL;
2364
2365 asconf.serial = htonl(serial);
2366
2367 retval->subh.addip_hdr =
2368 sctp_addto_chunk(retval, sizeof(asconf), &asconf);
2369
2370 return retval;
2371}
2372
2373/* Add response parameters to an ASCONF_ACK chunk. */
2374static void sctp_add_asconf_response(struct sctp_chunk *chunk, __u32 crr_id,
dbc16db1 2375 __be16 err_code, sctp_addip_param_t *asconf_param)
1da177e4
LT		 2376{
2377 sctp_addip_param_t ack_param;
2378 sctp_errhdr_t err_param;
2379 int asconf_param_len = 0;
2380 int err_param_len = 0;
dbc16db1 2381 __be16 response_type;
1da177e4
LT		 2382
2383 if (SCTP_ERROR_NO_ERROR == err_code) {
2384 response_type = SCTP_PARAM_SUCCESS_REPORT;
2385 } else {
2386 response_type = SCTP_PARAM_ERR_CAUSE;
2387 err_param_len = sizeof(err_param);
2388 if (asconf_param)
2389 asconf_param_len =
2390 ntohs(asconf_param->param_hdr.length);
2391 }
2392
2393 /* Add Success Indication or Error Cause Indication parameter. */
2394 ack_param.param_hdr.type = response_type;
2395 ack_param.param_hdr.length = htons(sizeof(ack_param) +
2396 err_param_len +
2397 asconf_param_len);
2398 ack_param.crr_id = crr_id;
2399 sctp_addto_chunk(chunk, sizeof(ack_param), &ack_param);
2400
2401 if (SCTP_ERROR_NO_ERROR == err_code)
2402 return;
2403
2404 /* Add Error Cause parameter. */
2405 err_param.cause = err_code;
2406 err_param.length = htons(err_param_len + asconf_param_len);
2407 sctp_addto_chunk(chunk, err_param_len, &err_param);
2408
2409 /* Add the failed TLV copied from ASCONF chunk. */
2410 if (asconf_param)
2411 sctp_addto_chunk(chunk, asconf_param_len, asconf_param);
2412}
2413
2414/* Process a asconf parameter. */
dbc16db1 2415static __be16 sctp_process_asconf_param(struct sctp_association *asoc,
1da177e4
LT		 2416 struct sctp_chunk *asconf,
2417 sctp_addip_param_t *asconf_param)
2418{
2419 struct sctp_transport *peer;
2420 struct sctp_af *af;
2421 union sctp_addr addr;
2422 struct list_head *pos;
2423 union sctp_addr_param *addr_param;
5f242a13
AV		 2424 union sctp_addr tmp, tmp_addr;
2425
1da177e4
LT		 2426 addr_param = (union sctp_addr_param *)
2427 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2428
2429 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2430 if (unlikely(!af))
2431 return SCTP_ERROR_INV_PARAM;
2432
2433 af->from_addr_param(&addr, addr_param, asoc->peer.port, 0);
5f242a13 2434 flip_to_n(&tmp_addr, &addr);
1da177e4
LT		 2435 switch (asconf_param->param_hdr.type) {
2436 case SCTP_PARAM_ADD_IP:
2437 /* ADDIP 4.3 D9) If an endpoint receives an ADD IP address
2438 * request and does not have the local resources to add this
2439 * new address to the association, it MUST return an Error
2440 * Cause TLV set to the new error code 'Operation Refused
2441 * Due to Resource Shortage'.
2442 */
2443
4bdf4b5f 2444 peer = sctp_assoc_add_peer(asoc, &tmp_addr, GFP_ATOMIC, SCTP_UNCONFIRMED);
1da177e4
LT		 2445 if (!peer)
2446 return SCTP_ERROR_RSRC_LOW;
2447
2448 /* Start the heartbeat timer. */
2449 if (!mod_timer(&peer->hb_timer, sctp_transport_timeout(peer)))
2450 sctp_transport_hold(peer);
2451 break;
2452 case SCTP_PARAM_DEL_IP:
2453 /* ADDIP 4.3 D7) If a request is received to delete the
2454 * last remaining IP address of a peer endpoint, the receiver
2455 * MUST send an Error Cause TLV with the error cause set to the
2456 * new error code 'Request to Delete Last Remaining IP Address'.
2457 */
2458 pos = asoc->peer.transport_addr_list.next;
2459 if (pos->next == &asoc->peer.transport_addr_list)
2460 return SCTP_ERROR_DEL_LAST_IP;
2461
2462 /* ADDIP 4.3 D8) If a request is received to delete an IP
2463 * address which is also the source address of the IP packet
2464 * which contained the ASCONF chunk, the receiver MUST reject
2465 * this request. To reject the request the receiver MUST send
2466 * an Error Cause TLV set to the new error code 'Request to
2467 * Delete Source IP Address'
2468 */
5f242a13
AV		 2469 flip_to_n(&tmp, sctp_source(asconf));
2470 if (sctp_cmp_addr_exact(&tmp, &tmp_addr))
1da177e4
LT		 2471 return SCTP_ERROR_DEL_SRC_IP;
2472
38a03145 2473 sctp_assoc_del_peer(asoc, &tmp_addr);
1da177e4
LT		 2474 break;
2475 case SCTP_PARAM_SET_PRIMARY:
be29681e 2476 peer = sctp_assoc_lookup_paddr(asoc, &tmp_addr);
1da177e4
LT		 2477 if (!peer)
2478 return SCTP_ERROR_INV_PARAM;
2479
2480 sctp_assoc_set_primary(asoc, peer);
2481 break;
2482 default:
2483 return SCTP_ERROR_INV_PARAM;
2484 break;
2485 }
2486
2487 return SCTP_ERROR_NO_ERROR;
2488}
2489
2490/* Process an incoming ASCONF chunk with the next expected serial no. and
2491 * return an ASCONF_ACK chunk to be sent in response.
2492 */
2493struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
2494 struct sctp_chunk *asconf)
2495{
2496 sctp_addiphdr_t *hdr;
2497 union sctp_addr_param *addr_param;
2498 sctp_addip_param_t *asconf_param;
2499 struct sctp_chunk *asconf_ack;
2500
dbc16db1 2501 __be16 err_code;
1da177e4
LT		 2502 int length = 0;
2503 int chunk_len = asconf->skb->len;
2504 __u32 serial;
2505 int all_param_pass = 1;
2506
2507 hdr = (sctp_addiphdr_t *)asconf->skb->data;
2508 serial = ntohl(hdr->serial);
2509
2510 /* Skip the addiphdr and store a pointer to address parameter. */
2511 length = sizeof(sctp_addiphdr_t);
2512 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
2513 chunk_len -= length;
2514
2515 /* Skip the address parameter and store a pointer to the first
2516 * asconf paramter.
2517 */
2518 length = ntohs(addr_param->v4.param_hdr.length);
2519 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
2520 chunk_len -= length;
2521
2522 /* create an ASCONF_ACK chunk.
2523 * Based on the definitions of parameters, we know that the size of
2524 * ASCONF_ACK parameters are less than or equal to the twice of ASCONF
2525 * paramters.
2526 */
2527 asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2);
2528 if (!asconf_ack)
2529 goto done;
2530
2531 /* Process the TLVs contained within the ASCONF chunk. */
2532 while (chunk_len > 0) {
2533 err_code = sctp_process_asconf_param(asoc, asconf,
2534 asconf_param);
2535 /* ADDIP 4.1 A7)
2536 * If an error response is received for a TLV parameter,
2537 * all TLVs with no response before the failed TLV are
2538 * considered successful if not reported. All TLVs after
2539 * the failed response are considered unsuccessful unless
2540 * a specific success indication is present for the parameter.
2541 */
2542 if (SCTP_ERROR_NO_ERROR != err_code)
2543 all_param_pass = 0;
2544
2545 if (!all_param_pass)
2546 sctp_add_asconf_response(asconf_ack,
2547 asconf_param->crr_id, err_code,
2548 asconf_param);
2549
2550 /* ADDIP 4.3 D11) When an endpoint receiving an ASCONF to add
2551 * an IP address sends an 'Out of Resource' in its response, it
2552 * MUST also fail any subsequent add or delete requests bundled
2553 * in the ASCONF.
2554 */
2555 if (SCTP_ERROR_RSRC_LOW == err_code)
2556 goto done;
2557
2558 /* Move to the next ASCONF param. */
2559 length = ntohs(asconf_param->param_hdr.length);
2560 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
2561 length);
2562 chunk_len -= length;
2563 }
2564
2565done:
2566 asoc->peer.addip_serial++;
2567
2568 /* If we are sending a new ASCONF_ACK hold a reference to it in assoc
2569 * after freeing the reference to old asconf ack if any.
2570 */
2571 if (asconf_ack) {
2572 if (asoc->addip_last_asconf_ack)
2573 sctp_chunk_free(asoc->addip_last_asconf_ack);
2574
2575 sctp_chunk_hold(asconf_ack);
2576 asoc->addip_last_asconf_ack = asconf_ack;
2577 }
2578
2579 return asconf_ack;
2580}
2581
2582/* Process a asconf parameter that is successfully acked. */
2583static int sctp_asconf_param_success(struct sctp_association *asoc,
2584 sctp_addip_param_t *asconf_param)
2585{
2586 struct sctp_af *af;
2587 union sctp_addr addr;
2588 struct sctp_bind_addr *bp = &asoc->base.bind_addr;
2589 union sctp_addr_param *addr_param;
2590 struct list_head *pos;
2591 struct sctp_transport *transport;
dc022a98 2592 struct sctp_sockaddr_entry *saddr;
1da177e4 2593 int retval = 0;
5f242a13 2594 union sctp_addr tmp;
1da177e4
LT		 2595
2596 addr_param = (union sctp_addr_param *)
2597 ((void *)asconf_param + sizeof(sctp_addip_param_t));
2598
2599 /* We have checked the packet before, so we do not check again. */
2600 af = sctp_get_af_specific(param_type2af(addr_param->v4.param_hdr.type));
2601 af->from_addr_param(&addr, addr_param, bp->port, 0);
5f242a13 2602 flip_to_n(&tmp, &addr);
1da177e4
LT		 2603
2604 switch (asconf_param->param_hdr.type) {
2605 case SCTP_PARAM_ADD_IP:
2606 sctp_local_bh_disable();
2607 sctp_write_lock(&asoc->base.addr_lock);
dc022a98
SS		 2608 list_for_each(pos, &bp->address_list) {
2609 saddr = list_entry(pos, struct sctp_sockaddr_entry, list);
5f242a13 2610 if (sctp_cmp_addr_exact(&saddr->a, &tmp))
dc022a98
SS		 2611 saddr->use_as_src = 1;
2612 }
1da177e4
LT		 2613 sctp_write_unlock(&asoc->base.addr_lock);
2614 sctp_local_bh_enable();
2615 break;
2616 case SCTP_PARAM_DEL_IP:
2617 sctp_local_bh_disable();
2618 sctp_write_lock(&asoc->base.addr_lock);
c9a08505 2619 retval = sctp_del_bind_addr(bp, &tmp);
1da177e4
LT		 2620 sctp_write_unlock(&asoc->base.addr_lock);
2621 sctp_local_bh_enable();
2622 list_for_each(pos, &asoc->peer.transport_addr_list) {
2623 transport = list_entry(pos, struct sctp_transport,
2624 transports);
dc022a98 2625 dst_release(transport->dst);
1da177e4
LT		 2626 sctp_transport_route(transport, NULL,
2627 sctp_sk(asoc->base.sk));
2628 }
2629 break;
2630 default:
2631 break;
2632 }
2633
2634 return retval;
2635}
2636
2637/* Get the corresponding ASCONF response error code from the ASCONF_ACK chunk
2638 * for the given asconf parameter. If there is no response for this parameter,
2639 * return the error code based on the third argument 'no_err'.
2640 * ADDIP 4.1
2641 * A7) If an error response is received for a TLV parameter, all TLVs with no
2642 * response before the failed TLV are considered successful if not reported.
2643 * All TLVs after the failed response are considered unsuccessful unless a
2644 * specific success indication is present for the parameter.
2645 */
dbc16db1 2646static __be16 sctp_get_asconf_response(struct sctp_chunk *asconf_ack,
1da177e4
LT		 2647 sctp_addip_param_t *asconf_param,
2648 int no_err)
2649{
2650 sctp_addip_param_t *asconf_ack_param;
2651 sctp_errhdr_t *err_param;
2652 int length;
2653 int asconf_ack_len = asconf_ack->skb->len;
dbc16db1 2654 __be16 err_code;
1da177e4
LT		 2655
2656 if (no_err)
2657 err_code = SCTP_ERROR_NO_ERROR;
2658 else
2659 err_code = SCTP_ERROR_REQ_REFUSED;
2660
2661 /* Skip the addiphdr from the asconf_ack chunk and store a pointer to
2662 * the first asconf_ack parameter.
2663 */
2664 length = sizeof(sctp_addiphdr_t);
2665 asconf_ack_param = (sctp_addip_param_t *)(asconf_ack->skb->data +
2666 length);
2667 asconf_ack_len -= length;
2668
2669 while (asconf_ack_len > 0) {
2670 if (asconf_ack_param->crr_id == asconf_param->crr_id) {
2671 switch(asconf_ack_param->param_hdr.type) {
2672 case SCTP_PARAM_SUCCESS_REPORT:
2673 return SCTP_ERROR_NO_ERROR;
2674 case SCTP_PARAM_ERR_CAUSE:
2675 length = sizeof(sctp_addip_param_t);
2676 err_param = (sctp_errhdr_t *)
2677 ((void *)asconf_ack_param + length);
2678 asconf_ack_len -= length;
2679 if (asconf_ack_len > 0)
2680 return err_param->cause;
2681 else
2682 return SCTP_ERROR_INV_PARAM;
2683 break;
2684 default:
2685 return SCTP_ERROR_INV_PARAM;
2686 }
2687 }
2688
2689 length = ntohs(asconf_ack_param->param_hdr.length);
2690 asconf_ack_param = (sctp_addip_param_t *)
2691 ((void *)asconf_ack_param + length);
2692 asconf_ack_len -= length;
2693 }
2694
2695 return err_code;
2696}
2697
2698/* Process an incoming ASCONF_ACK chunk against the cached last ASCONF chunk. */
2699int sctp_process_asconf_ack(struct sctp_association *asoc,
2700 struct sctp_chunk *asconf_ack)
2701{
2702 struct sctp_chunk *asconf = asoc->addip_last_asconf;
2703 union sctp_addr_param *addr_param;
2704 sctp_addip_param_t *asconf_param;
2705 int length = 0;
2706 int asconf_len = asconf->skb->len;
2707 int all_param_pass = 0;
2708 int no_err = 1;
2709 int retval = 0;
dbc16db1 2710 __be16 err_code = SCTP_ERROR_NO_ERROR;
1da177e4
LT		 2711
2712 /* Skip the chunkhdr and addiphdr from the last asconf sent and store
2713 * a pointer to address parameter.
2714 */
2715 length = sizeof(sctp_addip_chunk_t);
2716 addr_param = (union sctp_addr_param *)(asconf->skb->data + length);
2717 asconf_len -= length;
2718
2719 /* Skip the address parameter in the last asconf sent and store a
2720 * pointer to the first asconf paramter.
2721 */
2722 length = ntohs(addr_param->v4.param_hdr.length);
2723 asconf_param = (sctp_addip_param_t *)((void *)addr_param + length);
2724 asconf_len -= length;
2725
2726 /* ADDIP 4.1
2727 * A8) If there is no response(s) to specific TLV parameter(s), and no
2728 * failures are indicated, then all request(s) are considered
2729 * successful.
2730 */
2731 if (asconf_ack->skb->len == sizeof(sctp_addiphdr_t))
2732 all_param_pass = 1;
2733
2734 /* Process the TLVs contained in the last sent ASCONF chunk. */
2735 while (asconf_len > 0) {
2736 if (all_param_pass)
2737 err_code = SCTP_ERROR_NO_ERROR;
2738 else {
2739 err_code = sctp_get_asconf_response(asconf_ack,
2740 asconf_param,
2741 no_err);
2742 if (no_err && (SCTP_ERROR_NO_ERROR != err_code))
2743 no_err = 0;
2744 }
2745
2746 switch (err_code) {
2747 case SCTP_ERROR_NO_ERROR:
2748 retval = sctp_asconf_param_success(asoc, asconf_param);
2749 break;
2750
2751 case SCTP_ERROR_RSRC_LOW:
2752 retval = 1;
2753 break;
2754
2755 case SCTP_ERROR_INV_PARAM:
2756 /* Disable sending this type of asconf parameter in
2757 * future.
2758 */
2759 asoc->peer.addip_disabled_mask |=
2760 asconf_param->param_hdr.type;
2761 break;
2762
2763 case SCTP_ERROR_REQ_REFUSED:
2764 case SCTP_ERROR_DEL_LAST_IP:
2765 case SCTP_ERROR_DEL_SRC_IP:
2766 default:
2767 break;
2768 }
2769
2770 /* Skip the processed asconf parameter and move to the next
2771 * one.
2772 */
2773 length = ntohs(asconf_param->param_hdr.length);
2774 asconf_param = (sctp_addip_param_t *)((void *)asconf_param +
2775 length);
2776 asconf_len -= length;
2777 }
2778
2779 /* Free the cached last sent asconf chunk. */
2780 sctp_chunk_free(asconf);
2781 asoc->addip_last_asconf = NULL;
2782
2783 /* Send the next asconf chunk from the addip chunk queue. */
79af02c2
DM		 2784 if (!list_empty(&asoc->addip_chunk_list)) {
2785 struct list_head *entry = asoc->addip_chunk_list.next;
2786 asconf = list_entry(entry, struct sctp_chunk, list);
2787
2788 list_del_init(entry);
2789
1da177e4
LT		 2790 /* Hold the chunk until an ASCONF_ACK is received. */
2791 sctp_chunk_hold(asconf);
2792 if (sctp_primitive_ASCONF(asoc, asconf))
2793 sctp_chunk_free(asconf);
2794 else
2795 asoc->addip_last_asconf = asconf;
2796 }
2797
2798 return retval;
2799}
2800
2801/* Make a FWD TSN chunk. */
2802struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
2803 __u32 new_cum_tsn, size_t nstreams,
2804 struct sctp_fwdtsn_skip *skiplist)
2805{
2806 struct sctp_chunk *retval = NULL;
2807 struct sctp_fwdtsn_chunk *ftsn_chunk;
2808 struct sctp_fwdtsn_hdr ftsn_hdr;
2809 struct sctp_fwdtsn_skip skip;
2810 size_t hint;
2811 int i;
2812
2813 hint = (nstreams + 1) * sizeof(__u32);
2814
1da177e4
LT		 2815 retval = sctp_make_chunk(asoc, SCTP_CID_FWD_TSN, 0, hint);
2816
2817 if (!retval)
2818 return NULL;
2819
2820 ftsn_chunk = (struct sctp_fwdtsn_chunk *)retval->subh.fwdtsn_hdr;
2821
2822 ftsn_hdr.new_cum_tsn = htonl(new_cum_tsn);
2823 retval->subh.fwdtsn_hdr =
2824 sctp_addto_chunk(retval, sizeof(ftsn_hdr), &ftsn_hdr);
2825
2826 for (i = 0; i < nstreams; i++) {
2827 skip.stream = skiplist[i].stream;
2828 skip.ssn = skiplist[i].ssn;
2829 sctp_addto_chunk(retval, sizeof(skip), &skip);
2830 }
2831
2832 return retval;
2833}
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