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 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 *
9 * This file is part of the SCTP kernel reference Implementation
10 *
11 * Various protocol defined structures.
12 *
13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, see
27 * <http://www.gnu.org/licenses/>.
28 *
29 * Please send any bug reports or fixes you make to the
30 * email address(es):
31 * lksctp developers <linux-sctp@vger.kernel.org>
32 *
33 * Or submit a bug report through the following website:
34 * http://www.sf.net/projects/lksctp
35 *
36 * Written or modified by:
37 * La Monte H.P. Yarroll <piggy@acm.org>
38 * Karl Knutson <karl@athena.chicago.il.us>
39 * Jon Grimm <jgrimm@us.ibm.com>
40 * Xingang Guo <xingang.guo@intel.com>
41 * randall@sctp.chicago.il.us
42 * kmorneau@cisco.com
43 * qxie1@email.mot.com
44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Kevin Gao <kevin.gao@intel.com>
46 *
47 * Any bugs reported given to us we will try to fix... any fixes shared will
48 * be incorporated into the next SCTP release.
49 */
50 #ifndef __LINUX_SCTP_H__
51 #define __LINUX_SCTP_H__
52
53 #include <linux/in.h> /* We need in_addr. */
54 #include <linux/in6.h> /* We need in6_addr. */
55 #include <linux/skbuff.h>
56
57 #include <uapi/linux/sctp.h>
58
59 /* Section 3.1. SCTP Common Header Format */
60 struct sctphdr {
61 __be16 source;
62 __be16 dest;
63 __be32 vtag;
64 __le32 checksum;
65 };
66
sctp_hdr(const struct sk_buff * skb)67 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
68 {
69 return (struct sctphdr *)skb_transport_header(skb);
70 }
71
72 /* Section 3.2. Chunk Field Descriptions. */
73 struct sctp_chunkhdr {
74 __u8 type;
75 __u8 flags;
76 __be16 length;
77 };
78
79
80 /* Section 3.2. Chunk Type Values.
81 * [Chunk Type] identifies the type of information contained in the Chunk
82 * Value field. It takes a value from 0 to 254. The value of 255 is
83 * reserved for future use as an extension field.
84 */
85 enum sctp_cid {
86 SCTP_CID_DATA = 0,
87 SCTP_CID_INIT = 1,
88 SCTP_CID_INIT_ACK = 2,
89 SCTP_CID_SACK = 3,
90 SCTP_CID_HEARTBEAT = 4,
91 SCTP_CID_HEARTBEAT_ACK = 5,
92 SCTP_CID_ABORT = 6,
93 SCTP_CID_SHUTDOWN = 7,
94 SCTP_CID_SHUTDOWN_ACK = 8,
95 SCTP_CID_ERROR = 9,
96 SCTP_CID_COOKIE_ECHO = 10,
97 SCTP_CID_COOKIE_ACK = 11,
98 SCTP_CID_ECN_ECNE = 12,
99 SCTP_CID_ECN_CWR = 13,
100 SCTP_CID_SHUTDOWN_COMPLETE = 14,
101
102 /* AUTH Extension Section 4.1 */
103 SCTP_CID_AUTH = 0x0F,
104
105 /* PR-SCTP Sec 3.2 */
106 SCTP_CID_FWD_TSN = 0xC0,
107
108 /* Use hex, as defined in ADDIP sec. 3.1 */
109 SCTP_CID_ASCONF = 0xC1,
110 SCTP_CID_ASCONF_ACK = 0x80,
111 SCTP_CID_RECONF = 0x82,
112 }; /* enum */
113
114
115 /* Section 3.2
116 * Chunk Types are encoded such that the highest-order two bits specify
117 * the action that must be taken if the processing endpoint does not
118 * recognize the Chunk Type.
119 */
120 enum {
121 SCTP_CID_ACTION_DISCARD = 0x00,
122 SCTP_CID_ACTION_DISCARD_ERR = 0x40,
123 SCTP_CID_ACTION_SKIP = 0x80,
124 SCTP_CID_ACTION_SKIP_ERR = 0xc0,
125 };
126
127 enum { SCTP_CID_ACTION_MASK = 0xc0, };
128
129 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
130 *
131 * 3.3.7 Abort Association (ABORT) (6):
132 * The T bit is set to 0 if the sender had a TCB that it destroyed.
133 * If the sender did not have a TCB it should set this bit to 1.
134 */
135 enum { SCTP_CHUNK_FLAG_T = 0x01 };
136
137 /*
138 * Set the T bit
139 *
140 * 0 1 2 3
141 * 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
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | Type = 14 |Reserved |T| Length = 4 |
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 *
146 * Chunk Flags: 8 bits
147 *
148 * Reserved: 7 bits
149 * Set to 0 on transmit and ignored on receipt.
150 *
151 * T bit: 1 bit
152 * The T bit is set to 0 if the sender had a TCB that it destroyed. If
153 * the sender did NOT have a TCB it should set this bit to 1.
154 *
155 * Note: Special rules apply to this chunk for verification, please
156 * see Section 8.5.1 for details.
157 */
158
159 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
160
161 /* RFC 2960
162 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
163 */
164
165 struct sctp_paramhdr {
166 __be16 type;
167 __be16 length;
168 };
169
170 enum sctp_param {
171
172 /* RFC 2960 Section 3.3.5 */
173 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
174 /* RFC 2960 Section 3.3.2.1 */
175 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
176 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
177 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
178 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
179 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
180 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
181 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
182 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
183
184 /* AUTH Extension Section 3 */
185 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
186 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
187 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
188
189 /* Add-IP: Supported Extensions, Section 4.2 */
190 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
191
192 /* PR-SCTP Sec 3.1 */
193 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
194
195 /* Add-IP Extension. Section 3.2 */
196 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
197 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
198 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
199 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
200 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
201 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
202
203 /* RE-CONFIG. Section 4 */
204 SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d),
205 SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e),
206 SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f),
207 SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010),
208 SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011),
209 SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012),
210 }; /* enum */
211
212
213 /* RFC 2960 Section 3.2.1
214 * The Parameter Types are encoded such that the highest-order two bits
215 * specify the action that must be taken if the processing endpoint does
216 * not recognize the Parameter Type.
217 *
218 */
219 enum {
220 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
221 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
222 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
223 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
224 };
225
226 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
227
228 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
229
230 struct sctp_datahdr {
231 __be32 tsn;
232 __be16 stream;
233 __be16 ssn;
234 __u32 ppid;
235 __u8 payload[0];
236 };
237
238 struct sctp_data_chunk {
239 struct sctp_chunkhdr chunk_hdr;
240 struct sctp_datahdr data_hdr;
241 };
242
243 /* DATA Chuck Specific Flags */
244 enum {
245 SCTP_DATA_MIDDLE_FRAG = 0x00,
246 SCTP_DATA_LAST_FRAG = 0x01,
247 SCTP_DATA_FIRST_FRAG = 0x02,
248 SCTP_DATA_NOT_FRAG = 0x03,
249 SCTP_DATA_UNORDERED = 0x04,
250 SCTP_DATA_SACK_IMM = 0x08,
251 };
252 enum { SCTP_DATA_FRAG_MASK = 0x03, };
253
254
255 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
256 *
257 * This chunk is used to initiate a SCTP association between two
258 * endpoints.
259 */
260 struct sctp_inithdr {
261 __be32 init_tag;
262 __be32 a_rwnd;
263 __be16 num_outbound_streams;
264 __be16 num_inbound_streams;
265 __be32 initial_tsn;
266 __u8 params[0];
267 };
268
269 struct sctp_init_chunk {
270 struct sctp_chunkhdr chunk_hdr;
271 struct sctp_inithdr init_hdr;
272 };
273
274
275 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
276 struct sctp_ipv4addr_param {
277 struct sctp_paramhdr param_hdr;
278 struct in_addr addr;
279 };
280
281 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
282 struct sctp_ipv6addr_param {
283 struct sctp_paramhdr param_hdr;
284 struct in6_addr addr;
285 };
286
287 /* Section 3.3.2.1 Cookie Preservative (9) */
288 struct sctp_cookie_preserve_param {
289 struct sctp_paramhdr param_hdr;
290 __be32 lifespan_increment;
291 };
292
293 /* Section 3.3.2.1 Host Name Address (11) */
294 struct sctp_hostname_param {
295 struct sctp_paramhdr param_hdr;
296 uint8_t hostname[0];
297 };
298
299 /* Section 3.3.2.1 Supported Address Types (12) */
300 struct sctp_supported_addrs_param {
301 struct sctp_paramhdr param_hdr;
302 __be16 types[0];
303 };
304
305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
306 struct sctp_adaptation_ind_param {
307 struct sctp_paramhdr param_hdr;
308 __be32 adaptation_ind;
309 };
310
311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
312 struct sctp_supported_ext_param {
313 struct sctp_paramhdr param_hdr;
314 __u8 chunks[0];
315 };
316
317 /* AUTH Section 3.1 Random */
318 struct sctp_random_param {
319 struct sctp_paramhdr param_hdr;
320 __u8 random_val[0];
321 };
322
323 /* AUTH Section 3.2 Chunk List */
324 struct sctp_chunks_param {
325 struct sctp_paramhdr param_hdr;
326 __u8 chunks[0];
327 };
328
329 /* AUTH Section 3.3 HMAC Algorithm */
330 struct sctp_hmac_algo_param {
331 struct sctp_paramhdr param_hdr;
332 __be16 hmac_ids[0];
333 };
334
335 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
336 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
337 * association.
338 */
339 struct sctp_initack_chunk {
340 struct sctp_chunkhdr chunk_hdr;
341 struct sctp_inithdr init_hdr;
342 };
343
344 /* Section 3.3.3.1 State Cookie (7) */
345 struct sctp_cookie_param {
346 struct sctp_paramhdr p;
347 __u8 body[0];
348 };
349
350 /* Section 3.3.3.1 Unrecognized Parameters (8) */
351 struct sctp_unrecognized_param {
352 struct sctp_paramhdr param_hdr;
353 struct sctp_paramhdr unrecognized;
354 };
355
356
357
358 /*
359 * 3.3.4 Selective Acknowledgement (SACK) (3):
360 *
361 * This chunk is sent to the peer endpoint to acknowledge received DATA
362 * chunks and to inform the peer endpoint of gaps in the received
363 * subsequences of DATA chunks as represented by their TSNs.
364 */
365
366 struct sctp_gap_ack_block {
367 __be16 start;
368 __be16 end;
369 };
370
371 union sctp_sack_variable {
372 struct sctp_gap_ack_block gab;
373 __be32 dup;
374 };
375
376 struct sctp_sackhdr {
377 __be32 cum_tsn_ack;
378 __be32 a_rwnd;
379 __be16 num_gap_ack_blocks;
380 __be16 num_dup_tsns;
381 union sctp_sack_variable variable[0];
382 };
383
384 struct sctp_sack_chunk {
385 struct sctp_chunkhdr chunk_hdr;
386 struct sctp_sackhdr sack_hdr;
387 };
388
389
390 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
391 *
392 * An endpoint should send this chunk to its peer endpoint to probe the
393 * reachability of a particular destination transport address defined in
394 * the present association.
395 */
396
397 struct sctp_heartbeathdr {
398 struct sctp_paramhdr info;
399 };
400
401 struct sctp_heartbeat_chunk {
402 struct sctp_chunkhdr chunk_hdr;
403 struct sctp_heartbeathdr hb_hdr;
404 };
405
406
407 /* For the abort and shutdown ACK we must carry the init tag in the
408 * common header. Just the common header is all that is needed with a
409 * chunk descriptor.
410 */
411 struct sctp_abort_chunk {
412 struct sctp_chunkhdr uh;
413 };
414
415
416 /* For the graceful shutdown we must carry the tag (in common header)
417 * and the highest consecutive acking value.
418 */
419 struct sctp_shutdownhdr {
420 __be32 cum_tsn_ack;
421 };
422
423 struct sctp_shutdown_chunk {
424 struct sctp_chunkhdr chunk_hdr;
425 struct sctp_shutdownhdr shutdown_hdr;
426 };
427
428 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
429
430 struct sctp_errhdr {
431 __be16 cause;
432 __be16 length;
433 __u8 variable[0];
434 };
435
436 struct sctp_operr_chunk {
437 struct sctp_chunkhdr chunk_hdr;
438 struct sctp_errhdr err_hdr;
439 };
440
441 /* RFC 2960 3.3.10 - Operation Error
442 *
443 * Cause Code: 16 bits (unsigned integer)
444 *
445 * Defines the type of error conditions being reported.
446 * Cause Code
447 * Value Cause Code
448 * --------- ----------------
449 * 1 Invalid Stream Identifier
450 * 2 Missing Mandatory Parameter
451 * 3 Stale Cookie Error
452 * 4 Out of Resource
453 * 5 Unresolvable Address
454 * 6 Unrecognized Chunk Type
455 * 7 Invalid Mandatory Parameter
456 * 8 Unrecognized Parameters
457 * 9 No User Data
458 * 10 Cookie Received While Shutting Down
459 */
460 enum sctp_error {
461
462 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
463 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
464 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
465 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
466 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
467 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
468 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
469 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
470 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
471 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
472 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
473
474
475 /* SCTP Implementation Guide:
476 * 11 Restart of an association with new addresses
477 * 12 User Initiated Abort
478 * 13 Protocol Violation
479 */
480
481 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
482 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
483 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
484
485 /* ADDIP Section 3.3 New Error Causes
486 *
487 * Four new Error Causes are added to the SCTP Operational Errors,
488 * primarily for use in the ASCONF-ACK chunk.
489 *
490 * Value Cause Code
491 * --------- ----------------
492 * 0x00A0 Request to Delete Last Remaining IP Address.
493 * 0x00A1 Operation Refused Due to Resource Shortage.
494 * 0x00A2 Request to Delete Source IP Address.
495 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
496 * 0x00A4 Request refused - no authorization.
497 */
498 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
499 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
500 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
501 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
502 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
503
504 /* AUTH Section 4. New Error Cause
505 *
506 * This section defines a new error cause that will be sent if an AUTH
507 * chunk is received with an unsupported HMAC identifier.
508 * illustrates the new error cause.
509 *
510 * Cause Code Error Cause Name
511 * --------------------------------------------------------------
512 * 0x0105 Unsupported HMAC Identifier
513 */
514 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
515 };
516
517
518
519 /* RFC 2960. Appendix A. Explicit Congestion Notification.
520 * Explicit Congestion Notification Echo (ECNE) (12)
521 */
522 struct sctp_ecnehdr {
523 __be32 lowest_tsn;
524 };
525
526 struct sctp_ecne_chunk {
527 struct sctp_chunkhdr chunk_hdr;
528 struct sctp_ecnehdr ence_hdr;
529 };
530
531 /* RFC 2960. Appendix A. Explicit Congestion Notification.
532 * Congestion Window Reduced (CWR) (13)
533 */
534 struct sctp_cwrhdr {
535 __be32 lowest_tsn;
536 };
537
538 /* PR-SCTP
539 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
540 *
541 * Forward Cumulative TSN chunk has the following format:
542 *
543 * 0 1 2 3
544 * 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
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Type = 192 | Flags = 0x00 | Length = Variable |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * | New Cumulative TSN |
549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * | Stream-1 | Stream Sequence-1 |
551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * \ /
553 * / \
554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555 * | Stream-N | Stream Sequence-N |
556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557 *
558 * Chunk Flags:
559 *
560 * Set to all zeros on transmit and ignored on receipt.
561 *
562 * New Cumulative TSN: 32 bit u_int
563 *
564 * This indicates the new cumulative TSN to the data receiver. Upon
565 * the reception of this value, the data receiver MUST consider
566 * any missing TSNs earlier than or equal to this value as received
567 * and stop reporting them as gaps in any subsequent SACKs.
568 *
569 * Stream-N: 16 bit u_int
570 *
571 * This field holds a stream number that was skipped by this
572 * FWD-TSN.
573 *
574 * Stream Sequence-N: 16 bit u_int
575 * This field holds the sequence number associated with the stream
576 * that was skipped. The stream sequence field holds the largest stream
577 * sequence number in this stream being skipped. The receiver of
578 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
579 * to enable delivery of any stranded TSN's that remain on the stream
580 * re-ordering queues. This field MUST NOT report TSN's corresponding
581 * to DATA chunk that are marked as unordered. For ordered DATA
582 * chunks this field MUST be filled in.
583 */
584 struct sctp_fwdtsn_skip {
585 __be16 stream;
586 __be16 ssn;
587 };
588
589 struct sctp_fwdtsn_hdr {
590 __be32 new_cum_tsn;
591 struct sctp_fwdtsn_skip skip[0];
592 };
593
594 struct sctp_fwdtsn_chunk {
595 struct sctp_chunkhdr chunk_hdr;
596 struct sctp_fwdtsn_hdr fwdtsn_hdr;
597 };
598
599
600 /* ADDIP
601 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
602 *
603 * Serial Number: 32 bits (unsigned integer)
604 * This value represents a Serial Number for the ASCONF Chunk. The
605 * valid range of Serial Number is from 0 to 2^32-1.
606 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
607 *
608 * Address Parameter: 8 or 20 bytes (depending on type)
609 * The address is an address of the sender of the ASCONF chunk,
610 * the address MUST be considered part of the association by the
611 * peer endpoint. This field may be used by the receiver of the
612 * ASCONF to help in finding the association. This parameter MUST
613 * be present in every ASCONF message i.e. it is a mandatory TLV
614 * parameter.
615 *
616 * ASCONF Parameter: TLV format
617 * Each Address configuration change is represented by a TLV
618 * parameter as defined in Section 3.2. One or more requests may
619 * be present in an ASCONF Chunk.
620 *
621 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
622 *
623 * Serial Number: 32 bits (unsigned integer)
624 * This value represents the Serial Number for the received ASCONF
625 * Chunk that is acknowledged by this chunk. This value is copied
626 * from the received ASCONF Chunk.
627 *
628 * ASCONF Parameter Response: TLV format
629 * The ASCONF Parameter Response is used in the ASCONF-ACK to
630 * report status of ASCONF processing.
631 */
632 struct sctp_addip_param {
633 struct sctp_paramhdr param_hdr;
634 __be32 crr_id;
635 };
636
637 struct sctp_addiphdr {
638 __be32 serial;
639 __u8 params[0];
640 };
641
642 struct sctp_addip_chunk {
643 struct sctp_chunkhdr chunk_hdr;
644 struct sctp_addiphdr addip_hdr;
645 };
646
647 /* AUTH
648 * Section 4.1 Authentication Chunk (AUTH)
649 *
650 * This chunk is used to hold the result of the HMAC calculation.
651 *
652 * 0 1 2 3
653 * 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
654 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
655 * | Type = 0x0F | Flags=0 | Length |
656 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
657 * | Shared Key Identifier | HMAC Identifier |
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | |
660 * \ HMAC /
661 * / \
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
663 *
664 * Type: 1 byte (unsigned integer)
665 * This value MUST be set to 0x0F for all AUTH-chunks.
666 *
667 * Flags: 1 byte (unsigned integer)
668 * Set to zero on transmit and ignored on receipt.
669 *
670 * Length: 2 bytes (unsigned integer)
671 * This value holds the length of the HMAC in bytes plus 8.
672 *
673 * Shared Key Identifier: 2 bytes (unsigned integer)
674 * This value describes which endpoint pair shared key is used.
675 *
676 * HMAC Identifier: 2 bytes (unsigned integer)
677 * This value describes which message digest is being used. Table 2
678 * shows the currently defined values.
679 *
680 * The following Table 2 shows the currently defined values for HMAC
681 * identifiers.
682 *
683 * +-----------------+--------------------------+
684 * | HMAC Identifier | Message Digest Algorithm |
685 * +-----------------+--------------------------+
686 * | 0 | Reserved |
687 * | 1 | SHA-1 defined in [8] |
688 * | 2 | Reserved |
689 * | 3 | SHA-256 defined in [8] |
690 * +-----------------+--------------------------+
691 *
692 *
693 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
694 * calculation.
695 */
696 struct sctp_authhdr {
697 __be16 shkey_id;
698 __be16 hmac_id;
699 __u8 hmac[0];
700 };
701
702 struct sctp_auth_chunk {
703 struct sctp_chunkhdr chunk_hdr;
704 struct sctp_authhdr auth_hdr;
705 };
706
707 struct sctp_infox {
708 struct sctp_info *sctpinfo;
709 struct sctp_association *asoc;
710 };
711
712 struct sctp_reconf_chunk {
713 struct sctp_chunkhdr chunk_hdr;
714 __u8 params[0];
715 };
716
717 struct sctp_strreset_outreq {
718 struct sctp_paramhdr param_hdr;
719 __be32 request_seq;
720 __be32 response_seq;
721 __be32 send_reset_at_tsn;
722 __be16 list_of_streams[0];
723 };
724
725 struct sctp_strreset_inreq {
726 struct sctp_paramhdr param_hdr;
727 __be32 request_seq;
728 __be16 list_of_streams[0];
729 };
730
731 struct sctp_strreset_tsnreq {
732 struct sctp_paramhdr param_hdr;
733 __be32 request_seq;
734 };
735
736 struct sctp_strreset_addstrm {
737 struct sctp_paramhdr param_hdr;
738 __be32 request_seq;
739 __be16 number_of_streams;
740 __be16 reserved;
741 };
742
743 enum {
744 SCTP_STRRESET_NOTHING_TO_DO = 0x00,
745 SCTP_STRRESET_PERFORMED = 0x01,
746 SCTP_STRRESET_DENIED = 0x02,
747 SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
748 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
749 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
750 SCTP_STRRESET_IN_PROGRESS = 0x06,
751 };
752
753 struct sctp_strreset_resp {
754 struct sctp_paramhdr param_hdr;
755 __be32 response_seq;
756 __be32 result;
757 };
758
759 struct sctp_strreset_resptsn {
760 struct sctp_paramhdr param_hdr;
761 __be32 response_seq;
762 __be32 result;
763 __be32 senders_next_tsn;
764 __be32 receivers_next_tsn;
765 };
766
767 #endif /* __LINUX_SCTP_H__ */
768