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, 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-developerst@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 * Jon Grimm <jgrimm@us.ibm.com>
41 * Xingang Guo <xingang.guo@intel.com>
42 * randall@sctp.chicago.il.us
43 * kmorneau@cisco.com
44 * qxie1@email.mot.com
45 * Sridhar Samudrala <sri@us.ibm.com>
46 * Kevin Gao <kevin.gao@intel.com>
47 *
48 * Any bugs reported given to us we will try to fix... any fixes shared will
49 * be incorporated into the next SCTP release.
50 */
51 #ifndef __LINUX_SCTP_H__
52 #define __LINUX_SCTP_H__
53
54 #include <linux/in.h> /* We need in_addr. */
55 #include <linux/in6.h> /* We need in6_addr. */
56
57
58 /* Section 3.1. SCTP Common Header Format */
59 typedef struct sctphdr {
60 __be16 source;
61 __be16 dest;
62 __be32 vtag;
63 __le32 checksum;
64 } __packed sctp_sctphdr_t;
65
66 #ifdef __KERNEL__
67 #include <linux/skbuff.h>
68
sctp_hdr(const struct sk_buff * skb)69 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
70 {
71 return (struct sctphdr *)skb_transport_header(skb);
72 }
73 #endif
74
75 /* Section 3.2. Chunk Field Descriptions. */
76 typedef struct sctp_chunkhdr {
77 __u8 type;
78 __u8 flags;
79 __be16 length;
80 } __packed sctp_chunkhdr_t;
81
82
83 /* Section 3.2. Chunk Type Values.
84 * [Chunk Type] identifies the type of information contained in the Chunk
85 * Value field. It takes a value from 0 to 254. The value of 255 is
86 * reserved for future use as an extension field.
87 */
88 typedef enum {
89 SCTP_CID_DATA = 0,
90 SCTP_CID_INIT = 1,
91 SCTP_CID_INIT_ACK = 2,
92 SCTP_CID_SACK = 3,
93 SCTP_CID_HEARTBEAT = 4,
94 SCTP_CID_HEARTBEAT_ACK = 5,
95 SCTP_CID_ABORT = 6,
96 SCTP_CID_SHUTDOWN = 7,
97 SCTP_CID_SHUTDOWN_ACK = 8,
98 SCTP_CID_ERROR = 9,
99 SCTP_CID_COOKIE_ECHO = 10,
100 SCTP_CID_COOKIE_ACK = 11,
101 SCTP_CID_ECN_ECNE = 12,
102 SCTP_CID_ECN_CWR = 13,
103 SCTP_CID_SHUTDOWN_COMPLETE = 14,
104
105 /* AUTH Extension Section 4.1 */
106 SCTP_CID_AUTH = 0x0F,
107
108 /* PR-SCTP Sec 3.2 */
109 SCTP_CID_FWD_TSN = 0xC0,
110
111 /* Use hex, as defined in ADDIP sec. 3.1 */
112 SCTP_CID_ASCONF = 0xC1,
113 SCTP_CID_ASCONF_ACK = 0x80,
114 } sctp_cid_t; /* enum */
115
116
117 /* Section 3.2
118 * Chunk Types are encoded such that the highest-order two bits specify
119 * the action that must be taken if the processing endpoint does not
120 * recognize the Chunk Type.
121 */
122 typedef enum {
123 SCTP_CID_ACTION_DISCARD = 0x00,
124 SCTP_CID_ACTION_DISCARD_ERR = 0x40,
125 SCTP_CID_ACTION_SKIP = 0x80,
126 SCTP_CID_ACTION_SKIP_ERR = 0xc0,
127 } sctp_cid_action_t;
128
129 enum { SCTP_CID_ACTION_MASK = 0xc0, };
130
131 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
132 *
133 * 3.3.7 Abort Association (ABORT) (6):
134 * The T bit is set to 0 if the sender had a TCB that it destroyed.
135 * If the sender did not have a TCB it should set this bit to 1.
136 */
137 enum { SCTP_CHUNK_FLAG_T = 0x01 };
138
139 /*
140 * Set the T bit
141 *
142 * 0 1 2 3
143 * 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
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * | Type = 14 |Reserved |T| Length = 4 |
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 *
148 * Chunk Flags: 8 bits
149 *
150 * Reserved: 7 bits
151 * Set to 0 on transmit and ignored on receipt.
152 *
153 * T bit: 1 bit
154 * The T bit is set to 0 if the sender had a TCB that it destroyed. If
155 * the sender did NOT have a TCB it should set this bit to 1.
156 *
157 * Note: Special rules apply to this chunk for verification, please
158 * see Section 8.5.1 for details.
159 */
160
161 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
162
163 /* RFC 2960
164 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
165 */
166
167 typedef struct sctp_paramhdr {
168 __be16 type;
169 __be16 length;
170 } __packed sctp_paramhdr_t;
171
172 typedef enum {
173
174 /* RFC 2960 Section 3.3.5 */
175 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
176 /* RFC 2960 Section 3.3.2.1 */
177 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
178 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
179 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
180 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
181 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
182 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
183 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
184 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
185
186 /* AUTH Extension Section 3 */
187 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
188 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
189 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
190
191 /* Add-IP: Supported Extensions, Section 4.2 */
192 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
193
194 /* PR-SCTP Sec 3.1 */
195 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
196
197 /* Add-IP Extension. Section 3.2 */
198 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
199 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
200 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
201 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
202 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
203 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
204
205 } sctp_param_t; /* enum */
206
207
208 /* RFC 2960 Section 3.2.1
209 * The Parameter Types are encoded such that the highest-order two bits
210 * specify the action that must be taken if the processing endpoint does
211 * not recognize the Parameter Type.
212 *
213 */
214 typedef enum {
215 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
216 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
217 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
218 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
219 } sctp_param_action_t;
220
221 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
222
223 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
224
225 typedef struct sctp_datahdr {
226 __be32 tsn;
227 __be16 stream;
228 __be16 ssn;
229 __be32 ppid;
230 __u8 payload[0];
231 } __packed sctp_datahdr_t;
232
233 typedef struct sctp_data_chunk {
234 sctp_chunkhdr_t chunk_hdr;
235 sctp_datahdr_t data_hdr;
236 } __packed sctp_data_chunk_t;
237
238 /* DATA Chuck Specific Flags */
239 enum {
240 SCTP_DATA_MIDDLE_FRAG = 0x00,
241 SCTP_DATA_LAST_FRAG = 0x01,
242 SCTP_DATA_FIRST_FRAG = 0x02,
243 SCTP_DATA_NOT_FRAG = 0x03,
244 SCTP_DATA_UNORDERED = 0x04,
245 SCTP_DATA_SACK_IMM = 0x08,
246 };
247 enum { SCTP_DATA_FRAG_MASK = 0x03, };
248
249
250 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
251 *
252 * This chunk is used to initiate a SCTP association between two
253 * endpoints.
254 */
255 typedef struct sctp_inithdr {
256 __be32 init_tag;
257 __be32 a_rwnd;
258 __be16 num_outbound_streams;
259 __be16 num_inbound_streams;
260 __be32 initial_tsn;
261 __u8 params[0];
262 } __packed sctp_inithdr_t;
263
264 typedef struct sctp_init_chunk {
265 sctp_chunkhdr_t chunk_hdr;
266 sctp_inithdr_t init_hdr;
267 } __packed sctp_init_chunk_t;
268
269
270 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
271 typedef struct sctp_ipv4addr_param {
272 sctp_paramhdr_t param_hdr;
273 struct in_addr addr;
274 } __packed sctp_ipv4addr_param_t;
275
276 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
277 typedef struct sctp_ipv6addr_param {
278 sctp_paramhdr_t param_hdr;
279 struct in6_addr addr;
280 } __packed sctp_ipv6addr_param_t;
281
282 /* Section 3.3.2.1 Cookie Preservative (9) */
283 typedef struct sctp_cookie_preserve_param {
284 sctp_paramhdr_t param_hdr;
285 __be32 lifespan_increment;
286 } __packed sctp_cookie_preserve_param_t;
287
288 /* Section 3.3.2.1 Host Name Address (11) */
289 typedef struct sctp_hostname_param {
290 sctp_paramhdr_t param_hdr;
291 uint8_t hostname[0];
292 } __packed sctp_hostname_param_t;
293
294 /* Section 3.3.2.1 Supported Address Types (12) */
295 typedef struct sctp_supported_addrs_param {
296 sctp_paramhdr_t param_hdr;
297 __be16 types[0];
298 } __packed sctp_supported_addrs_param_t;
299
300 /* Appendix A. ECN Capable (32768) */
301 typedef struct sctp_ecn_capable_param {
302 sctp_paramhdr_t param_hdr;
303 } __packed sctp_ecn_capable_param_t;
304
305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
306 typedef struct sctp_adaptation_ind_param {
307 struct sctp_paramhdr param_hdr;
308 __be32 adaptation_ind;
309 } __packed sctp_adaptation_ind_param_t;
310
311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
312 typedef struct sctp_supported_ext_param {
313 struct sctp_paramhdr param_hdr;
314 __u8 chunks[0];
315 } __packed sctp_supported_ext_param_t;
316
317 /* AUTH Section 3.1 Random */
318 typedef struct sctp_random_param {
319 sctp_paramhdr_t param_hdr;
320 __u8 random_val[0];
321 } __packed sctp_random_param_t;
322
323 /* AUTH Section 3.2 Chunk List */
324 typedef struct sctp_chunks_param {
325 sctp_paramhdr_t param_hdr;
326 __u8 chunks[0];
327 } __packed sctp_chunks_param_t;
328
329 /* AUTH Section 3.3 HMAC Algorithm */
330 typedef struct sctp_hmac_algo_param {
331 sctp_paramhdr_t param_hdr;
332 __be16 hmac_ids[0];
333 } __packed sctp_hmac_algo_param_t;
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 typedef sctp_init_chunk_t sctp_initack_chunk_t;
340
341 /* Section 3.3.3.1 State Cookie (7) */
342 typedef struct sctp_cookie_param {
343 sctp_paramhdr_t p;
344 __u8 body[0];
345 } __packed sctp_cookie_param_t;
346
347 /* Section 3.3.3.1 Unrecognized Parameters (8) */
348 typedef struct sctp_unrecognized_param {
349 sctp_paramhdr_t param_hdr;
350 sctp_paramhdr_t unrecognized;
351 } __packed sctp_unrecognized_param_t;
352
353
354
355 /*
356 * 3.3.4 Selective Acknowledgement (SACK) (3):
357 *
358 * This chunk is sent to the peer endpoint to acknowledge received DATA
359 * chunks and to inform the peer endpoint of gaps in the received
360 * subsequences of DATA chunks as represented by their TSNs.
361 */
362
363 typedef struct sctp_gap_ack_block {
364 __be16 start;
365 __be16 end;
366 } __packed sctp_gap_ack_block_t;
367
368 typedef __be32 sctp_dup_tsn_t;
369
370 typedef union {
371 sctp_gap_ack_block_t gab;
372 sctp_dup_tsn_t dup;
373 } sctp_sack_variable_t;
374
375 typedef struct sctp_sackhdr {
376 __be32 cum_tsn_ack;
377 __be32 a_rwnd;
378 __be16 num_gap_ack_blocks;
379 __be16 num_dup_tsns;
380 sctp_sack_variable_t variable[0];
381 } __packed sctp_sackhdr_t;
382
383 typedef struct sctp_sack_chunk {
384 sctp_chunkhdr_t chunk_hdr;
385 sctp_sackhdr_t sack_hdr;
386 } __packed sctp_sack_chunk_t;
387
388
389 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
390 *
391 * An endpoint should send this chunk to its peer endpoint to probe the
392 * reachability of a particular destination transport address defined in
393 * the present association.
394 */
395
396 typedef struct sctp_heartbeathdr {
397 sctp_paramhdr_t info;
398 } __packed sctp_heartbeathdr_t;
399
400 typedef struct sctp_heartbeat_chunk {
401 sctp_chunkhdr_t chunk_hdr;
402 sctp_heartbeathdr_t hb_hdr;
403 } __packed sctp_heartbeat_chunk_t;
404
405
406 /* For the abort and shutdown ACK we must carry the init tag in the
407 * common header. Just the common header is all that is needed with a
408 * chunk descriptor.
409 */
410 typedef struct sctp_abort_chunk {
411 sctp_chunkhdr_t uh;
412 } __packed sctp_abort_chunk_t;
413
414
415 /* For the graceful shutdown we must carry the tag (in common header)
416 * and the highest consecutive acking value.
417 */
418 typedef struct sctp_shutdownhdr {
419 __be32 cum_tsn_ack;
420 } __packed sctp_shutdownhdr_t;
421
422 struct sctp_shutdown_chunk_t {
423 sctp_chunkhdr_t chunk_hdr;
424 sctp_shutdownhdr_t shutdown_hdr;
425 } __packed;
426
427 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
428
429 typedef struct sctp_errhdr {
430 __be16 cause;
431 __be16 length;
432 __u8 variable[0];
433 } __packed sctp_errhdr_t;
434
435 typedef struct sctp_operr_chunk {
436 sctp_chunkhdr_t chunk_hdr;
437 sctp_errhdr_t err_hdr;
438 } __packed sctp_operr_chunk_t;
439
440 /* RFC 2960 3.3.10 - Operation Error
441 *
442 * Cause Code: 16 bits (unsigned integer)
443 *
444 * Defines the type of error conditions being reported.
445 * Cause Code
446 * Value Cause Code
447 * --------- ----------------
448 * 1 Invalid Stream Identifier
449 * 2 Missing Mandatory Parameter
450 * 3 Stale Cookie Error
451 * 4 Out of Resource
452 * 5 Unresolvable Address
453 * 6 Unrecognized Chunk Type
454 * 7 Invalid Mandatory Parameter
455 * 8 Unrecognized Parameters
456 * 9 No User Data
457 * 10 Cookie Received While Shutting Down
458 */
459 typedef enum {
460
461 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
462 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
463 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
464 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
465 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
466 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
467 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
468 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
469 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
470 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
471 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
472
473
474 /* SCTP Implementation Guide:
475 * 11 Restart of an association with new addresses
476 * 12 User Initiated Abort
477 * 13 Protocol Violation
478 */
479
480 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
481 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
482 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
483
484 /* ADDIP Section 3.3 New Error Causes
485 *
486 * Four new Error Causes are added to the SCTP Operational Errors,
487 * primarily for use in the ASCONF-ACK chunk.
488 *
489 * Value Cause Code
490 * --------- ----------------
491 * 0x00A0 Request to Delete Last Remaining IP Address.
492 * 0x00A1 Operation Refused Due to Resource Shortage.
493 * 0x00A2 Request to Delete Source IP Address.
494 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
495 * 0x00A4 Request refused - no authorization.
496 */
497 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
498 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
499 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
500 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
501 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
502
503 /* AUTH Section 4. New Error Cause
504 *
505 * This section defines a new error cause that will be sent if an AUTH
506 * chunk is received with an unsupported HMAC identifier.
507 * illustrates the new error cause.
508 *
509 * Cause Code Error Cause Name
510 * --------------------------------------------------------------
511 * 0x0105 Unsupported HMAC Identifier
512 */
513 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
514 } sctp_error_t;
515
516
517
518 /* RFC 2960. Appendix A. Explicit Congestion Notification.
519 * Explicit Congestion Notification Echo (ECNE) (12)
520 */
521 typedef struct sctp_ecnehdr {
522 __be32 lowest_tsn;
523 } sctp_ecnehdr_t;
524
525 typedef struct sctp_ecne_chunk {
526 sctp_chunkhdr_t chunk_hdr;
527 sctp_ecnehdr_t ence_hdr;
528 } __packed sctp_ecne_chunk_t;
529
530 /* RFC 2960. Appendix A. Explicit Congestion Notification.
531 * Congestion Window Reduced (CWR) (13)
532 */
533 typedef struct sctp_cwrhdr {
534 __be32 lowest_tsn;
535 } sctp_cwrhdr_t;
536
537 typedef struct sctp_cwr_chunk {
538 sctp_chunkhdr_t chunk_hdr;
539 sctp_cwrhdr_t cwr_hdr;
540 } __packed sctp_cwr_chunk_t;
541
542 /* PR-SCTP
543 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
544 *
545 * Forward Cumulative TSN chunk has the following format:
546 *
547 * 0 1 2 3
548 * 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
549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * | Type = 192 | Flags = 0x00 | Length = Variable |
551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * | New Cumulative TSN |
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 * | Stream-1 | Stream Sequence-1 |
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * \ /
557 * / \
558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559 * | Stream-N | Stream Sequence-N |
560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 *
562 * Chunk Flags:
563 *
564 * Set to all zeros on transmit and ignored on receipt.
565 *
566 * New Cumulative TSN: 32 bit u_int
567 *
568 * This indicates the new cumulative TSN to the data receiver. Upon
569 * the reception of this value, the data receiver MUST consider
570 * any missing TSNs earlier than or equal to this value as received
571 * and stop reporting them as gaps in any subsequent SACKs.
572 *
573 * Stream-N: 16 bit u_int
574 *
575 * This field holds a stream number that was skipped by this
576 * FWD-TSN.
577 *
578 * Stream Sequence-N: 16 bit u_int
579 * This field holds the sequence number associated with the stream
580 * that was skipped. The stream sequence field holds the largest stream
581 * sequence number in this stream being skipped. The receiver of
582 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
583 * to enable delivery of any stranded TSN's that remain on the stream
584 * re-ordering queues. This field MUST NOT report TSN's corresponding
585 * to DATA chunk that are marked as unordered. For ordered DATA
586 * chunks this field MUST be filled in.
587 */
588 struct sctp_fwdtsn_skip {
589 __be16 stream;
590 __be16 ssn;
591 } __packed;
592
593 struct sctp_fwdtsn_hdr {
594 __be32 new_cum_tsn;
595 struct sctp_fwdtsn_skip skip[0];
596 } __packed;
597
598 struct sctp_fwdtsn_chunk {
599 struct sctp_chunkhdr chunk_hdr;
600 struct sctp_fwdtsn_hdr fwdtsn_hdr;
601 } __packed;
602
603
604 /* ADDIP
605 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
606 *
607 * Serial Number: 32 bits (unsigned integer)
608 * This value represents a Serial Number for the ASCONF Chunk. The
609 * valid range of Serial Number is from 0 to 2^32-1.
610 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
611 *
612 * Address Parameter: 8 or 20 bytes (depending on type)
613 * The address is an address of the sender of the ASCONF chunk,
614 * the address MUST be considered part of the association by the
615 * peer endpoint. This field may be used by the receiver of the
616 * ASCONF to help in finding the association. This parameter MUST
617 * be present in every ASCONF message i.e. it is a mandatory TLV
618 * parameter.
619 *
620 * ASCONF Parameter: TLV format
621 * Each Address configuration change is represented by a TLV
622 * parameter as defined in Section 3.2. One or more requests may
623 * be present in an ASCONF Chunk.
624 *
625 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
626 *
627 * Serial Number: 32 bits (unsigned integer)
628 * This value represents the Serial Number for the received ASCONF
629 * Chunk that is acknowledged by this chunk. This value is copied
630 * from the received ASCONF Chunk.
631 *
632 * ASCONF Parameter Response: TLV format
633 * The ASCONF Parameter Response is used in the ASCONF-ACK to
634 * report status of ASCONF processing.
635 */
636 typedef struct sctp_addip_param {
637 sctp_paramhdr_t param_hdr;
638 __be32 crr_id;
639 } __packed sctp_addip_param_t;
640
641 typedef struct sctp_addiphdr {
642 __be32 serial;
643 __u8 params[0];
644 } __packed sctp_addiphdr_t;
645
646 typedef struct sctp_addip_chunk {
647 sctp_chunkhdr_t chunk_hdr;
648 sctp_addiphdr_t addip_hdr;
649 } __packed sctp_addip_chunk_t;
650
651 /* AUTH
652 * Section 4.1 Authentication Chunk (AUTH)
653 *
654 * This chunk is used to hold the result of the HMAC calculation.
655 *
656 * 0 1 2 3
657 * 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
658 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659 * | Type = 0x0F | Flags=0 | Length |
660 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661 * | Shared Key Identifier | HMAC Identifier |
662 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
663 * | |
664 * \ HMAC /
665 * / \
666 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
667 *
668 * Type: 1 byte (unsigned integer)
669 * This value MUST be set to 0x0F for all AUTH-chunks.
670 *
671 * Flags: 1 byte (unsigned integer)
672 * Set to zero on transmit and ignored on receipt.
673 *
674 * Length: 2 bytes (unsigned integer)
675 * This value holds the length of the HMAC in bytes plus 8.
676 *
677 * Shared Key Identifier: 2 bytes (unsigned integer)
678 * This value describes which endpoint pair shared key is used.
679 *
680 * HMAC Identifier: 2 bytes (unsigned integer)
681 * This value describes which message digest is being used. Table 2
682 * shows the currently defined values.
683 *
684 * The following Table 2 shows the currently defined values for HMAC
685 * identifiers.
686 *
687 * +-----------------+--------------------------+
688 * | HMAC Identifier | Message Digest Algorithm |
689 * +-----------------+--------------------------+
690 * | 0 | Reserved |
691 * | 1 | SHA-1 defined in [8] |
692 * | 2 | Reserved |
693 * | 3 | SHA-256 defined in [8] |
694 * +-----------------+--------------------------+
695 *
696 *
697 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
698 * calculation.
699 */
700 typedef struct sctp_authhdr {
701 __be16 shkey_id;
702 __be16 hmac_id;
703 __u8 hmac[0];
704 } __packed sctp_authhdr_t;
705
706 typedef struct sctp_auth_chunk {
707 sctp_chunkhdr_t chunk_hdr;
708 sctp_authhdr_t auth_hdr;
709 } __packed sctp_auth_chunk_t;
710
711 #endif /* __LINUX_SCTP_H__ */
712