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 __be32 checksum;
64 } __attribute__((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 } __attribute__((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 } __attribute__((packed)) sctp_paramhdr_t;
171
172 typedef enum {
173
174 /* RFC 2960 Section 3.3.5 */
175 SCTP_PARAM_HEARTBEAT_INFO = __constant_htons(1),
176 /* RFC 2960 Section 3.3.2.1 */
177 SCTP_PARAM_IPV4_ADDRESS = __constant_htons(5),
178 SCTP_PARAM_IPV6_ADDRESS = __constant_htons(6),
179 SCTP_PARAM_STATE_COOKIE = __constant_htons(7),
180 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = __constant_htons(8),
181 SCTP_PARAM_COOKIE_PRESERVATIVE = __constant_htons(9),
182 SCTP_PARAM_HOST_NAME_ADDRESS = __constant_htons(11),
183 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = __constant_htons(12),
184 SCTP_PARAM_ECN_CAPABLE = __constant_htons(0x8000),
185
186 /* AUTH Extension Section 3 */
187 SCTP_PARAM_RANDOM = __constant_htons(0x8002),
188 SCTP_PARAM_CHUNKS = __constant_htons(0x8003),
189 SCTP_PARAM_HMAC_ALGO = __constant_htons(0x8004),
190
191 /* Add-IP: Supported Extensions, Section 4.2 */
192 SCTP_PARAM_SUPPORTED_EXT = __constant_htons(0x8008),
193
194 /* PR-SCTP Sec 3.1 */
195 SCTP_PARAM_FWD_TSN_SUPPORT = __constant_htons(0xc000),
196
197 /* Add-IP Extension. Section 3.2 */
198 SCTP_PARAM_ADD_IP = __constant_htons(0xc001),
199 SCTP_PARAM_DEL_IP = __constant_htons(0xc002),
200 SCTP_PARAM_ERR_CAUSE = __constant_htons(0xc003),
201 SCTP_PARAM_SET_PRIMARY = __constant_htons(0xc004),
202 SCTP_PARAM_SUCCESS_REPORT = __constant_htons(0xc005),
203 SCTP_PARAM_ADAPTATION_LAYER_IND = __constant_htons(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 = __constant_htons(0x0000),
216 SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000),
217 SCTP_PARAM_ACTION_SKIP = __constant_htons(0x8000),
218 SCTP_PARAM_ACTION_SKIP_ERR = __constant_htons(0xc000),
219 } sctp_param_action_t;
220
221 enum { SCTP_PARAM_ACTION_MASK = __constant_htons(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 } __attribute__((packed)) sctp_datahdr_t;
232
233 typedef struct sctp_data_chunk {
234 sctp_chunkhdr_t chunk_hdr;
235 sctp_datahdr_t data_hdr;
236 } __attribute__((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 };
246 enum { SCTP_DATA_FRAG_MASK = 0x03, };
247
248
249 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
250 *
251 * This chunk is used to initiate a SCTP association between two
252 * endpoints.
253 */
254 typedef struct sctp_inithdr {
255 __be32 init_tag;
256 __be32 a_rwnd;
257 __be16 num_outbound_streams;
258 __be16 num_inbound_streams;
259 __be32 initial_tsn;
260 __u8 params[0];
261 } __attribute__((packed)) sctp_inithdr_t;
262
263 typedef struct sctp_init_chunk {
264 sctp_chunkhdr_t chunk_hdr;
265 sctp_inithdr_t init_hdr;
266 } __attribute__((packed)) sctp_init_chunk_t;
267
268
269 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
270 typedef struct sctp_ipv4addr_param {
271 sctp_paramhdr_t param_hdr;
272 struct in_addr addr;
273 } __attribute__((packed)) sctp_ipv4addr_param_t;
274
275 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
276 typedef struct sctp_ipv6addr_param {
277 sctp_paramhdr_t param_hdr;
278 struct in6_addr addr;
279 } __attribute__((packed)) sctp_ipv6addr_param_t;
280
281 /* Section 3.3.2.1 Cookie Preservative (9) */
282 typedef struct sctp_cookie_preserve_param {
283 sctp_paramhdr_t param_hdr;
284 __be32 lifespan_increment;
285 } __attribute__((packed)) sctp_cookie_preserve_param_t;
286
287 /* Section 3.3.2.1 Host Name Address (11) */
288 typedef struct sctp_hostname_param {
289 sctp_paramhdr_t param_hdr;
290 uint8_t hostname[0];
291 } __attribute__((packed)) sctp_hostname_param_t;
292
293 /* Section 3.3.2.1 Supported Address Types (12) */
294 typedef struct sctp_supported_addrs_param {
295 sctp_paramhdr_t param_hdr;
296 __be16 types[0];
297 } __attribute__((packed)) sctp_supported_addrs_param_t;
298
299 /* Appendix A. ECN Capable (32768) */
300 typedef struct sctp_ecn_capable_param {
301 sctp_paramhdr_t param_hdr;
302 } __attribute__((packed)) sctp_ecn_capable_param_t;
303
304 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
305 typedef struct sctp_adaptation_ind_param {
306 struct sctp_paramhdr param_hdr;
307 __be32 adaptation_ind;
308 } __attribute__((packed)) sctp_adaptation_ind_param_t;
309
310 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
311 typedef struct sctp_supported_ext_param {
312 struct sctp_paramhdr param_hdr;
313 __u8 chunks[0];
314 } __attribute__((packed)) sctp_supported_ext_param_t;
315
316 /* AUTH Section 3.1 Random */
317 typedef struct sctp_random_param {
318 sctp_paramhdr_t param_hdr;
319 __u8 random_val[0];
320 } __attribute__((packed)) sctp_random_param_t;
321
322 /* AUTH Section 3.2 Chunk List */
323 typedef struct sctp_chunks_param {
324 sctp_paramhdr_t param_hdr;
325 __u8 chunks[0];
326 } __attribute__((packed)) sctp_chunks_param_t;
327
328 /* AUTH Section 3.3 HMAC Algorithm */
329 typedef struct sctp_hmac_algo_param {
330 sctp_paramhdr_t param_hdr;
331 __be16 hmac_ids[0];
332 } __attribute__((packed)) sctp_hmac_algo_param_t;
333
334 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
335 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
336 * association.
337 */
338 typedef sctp_init_chunk_t sctp_initack_chunk_t;
339
340 /* Section 3.3.3.1 State Cookie (7) */
341 typedef struct sctp_cookie_param {
342 sctp_paramhdr_t p;
343 __u8 body[0];
344 } __attribute__((packed)) sctp_cookie_param_t;
345
346 /* Section 3.3.3.1 Unrecognized Parameters (8) */
347 typedef struct sctp_unrecognized_param {
348 sctp_paramhdr_t param_hdr;
349 sctp_paramhdr_t unrecognized;
350 } __attribute__((packed)) sctp_unrecognized_param_t;
351
352
353
354 /*
355 * 3.3.4 Selective Acknowledgement (SACK) (3):
356 *
357 * This chunk is sent to the peer endpoint to acknowledge received DATA
358 * chunks and to inform the peer endpoint of gaps in the received
359 * subsequences of DATA chunks as represented by their TSNs.
360 */
361
362 typedef struct sctp_gap_ack_block {
363 __be16 start;
364 __be16 end;
365 } __attribute__((packed)) sctp_gap_ack_block_t;
366
367 typedef __be32 sctp_dup_tsn_t;
368
369 typedef union {
370 sctp_gap_ack_block_t gab;
371 sctp_dup_tsn_t dup;
372 } sctp_sack_variable_t;
373
374 typedef struct sctp_sackhdr {
375 __be32 cum_tsn_ack;
376 __be32 a_rwnd;
377 __be16 num_gap_ack_blocks;
378 __be16 num_dup_tsns;
379 sctp_sack_variable_t variable[0];
380 } __attribute__((packed)) sctp_sackhdr_t;
381
382 typedef struct sctp_sack_chunk {
383 sctp_chunkhdr_t chunk_hdr;
384 sctp_sackhdr_t sack_hdr;
385 } __attribute__((packed)) sctp_sack_chunk_t;
386
387
388 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
389 *
390 * An endpoint should send this chunk to its peer endpoint to probe the
391 * reachability of a particular destination transport address defined in
392 * the present association.
393 */
394
395 typedef struct sctp_heartbeathdr {
396 sctp_paramhdr_t info;
397 } __attribute__((packed)) sctp_heartbeathdr_t;
398
399 typedef struct sctp_heartbeat_chunk {
400 sctp_chunkhdr_t chunk_hdr;
401 sctp_heartbeathdr_t hb_hdr;
402 } __attribute__((packed)) sctp_heartbeat_chunk_t;
403
404
405 /* For the abort and shutdown ACK we must carry the init tag in the
406 * common header. Just the common header is all that is needed with a
407 * chunk descriptor.
408 */
409 typedef struct sctp_abort_chunk {
410 sctp_chunkhdr_t uh;
411 } __attribute__((packed)) sctp_abort_chunk_t;
412
413
414 /* For the graceful shutdown we must carry the tag (in common header)
415 * and the highest consecutive acking value.
416 */
417 typedef struct sctp_shutdownhdr {
418 __be32 cum_tsn_ack;
419 } __attribute__((packed)) sctp_shutdownhdr_t;
420
421 struct sctp_shutdown_chunk_t {
422 sctp_chunkhdr_t chunk_hdr;
423 sctp_shutdownhdr_t shutdown_hdr;
424 } __attribute__ ((packed));
425
426 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
427
428 typedef struct sctp_errhdr {
429 __be16 cause;
430 __be16 length;
431 __u8 variable[0];
432 } __attribute__((packed)) sctp_errhdr_t;
433
434 typedef struct sctp_operr_chunk {
435 sctp_chunkhdr_t chunk_hdr;
436 sctp_errhdr_t err_hdr;
437 } __attribute__((packed)) sctp_operr_chunk_t;
438
439 /* RFC 2960 3.3.10 - Operation Error
440 *
441 * Cause Code: 16 bits (unsigned integer)
442 *
443 * Defines the type of error conditions being reported.
444 * Cause Code
445 * Value Cause Code
446 * --------- ----------------
447 * 1 Invalid Stream Identifier
448 * 2 Missing Mandatory Parameter
449 * 3 Stale Cookie Error
450 * 4 Out of Resource
451 * 5 Unresolvable Address
452 * 6 Unrecognized Chunk Type
453 * 7 Invalid Mandatory Parameter
454 * 8 Unrecognized Parameters
455 * 9 No User Data
456 * 10 Cookie Received While Shutting Down
457 */
458 typedef enum {
459
460 SCTP_ERROR_NO_ERROR = __constant_htons(0x00),
461 SCTP_ERROR_INV_STRM = __constant_htons(0x01),
462 SCTP_ERROR_MISS_PARAM = __constant_htons(0x02),
463 SCTP_ERROR_STALE_COOKIE = __constant_htons(0x03),
464 SCTP_ERROR_NO_RESOURCE = __constant_htons(0x04),
465 SCTP_ERROR_DNS_FAILED = __constant_htons(0x05),
466 SCTP_ERROR_UNKNOWN_CHUNK = __constant_htons(0x06),
467 SCTP_ERROR_INV_PARAM = __constant_htons(0x07),
468 SCTP_ERROR_UNKNOWN_PARAM = __constant_htons(0x08),
469 SCTP_ERROR_NO_DATA = __constant_htons(0x09),
470 SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a),
471
472
473 /* SCTP Implementation Guide:
474 * 11 Restart of an association with new addresses
475 * 12 User Initiated Abort
476 * 13 Protocol Violation
477 */
478
479 SCTP_ERROR_RESTART = __constant_htons(0x0b),
480 SCTP_ERROR_USER_ABORT = __constant_htons(0x0c),
481 SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d),
482
483 /* ADDIP Section 3.3 New Error Causes
484 *
485 * Four new Error Causes are added to the SCTP Operational Errors,
486 * primarily for use in the ASCONF-ACK chunk.
487 *
488 * Value Cause Code
489 * --------- ----------------
490 * 0x0100 Request to Delete Last Remaining IP Address.
491 * 0x0101 Operation Refused Due to Resource Shortage.
492 * 0x0102 Request to Delete Source IP Address.
493 * 0x0103 Association Aborted due to illegal ASCONF-ACK
494 * 0x0104 Request refused - no authorization.
495 */
496 SCTP_ERROR_DEL_LAST_IP = __constant_htons(0x0100),
497 SCTP_ERROR_RSRC_LOW = __constant_htons(0x0101),
498 SCTP_ERROR_DEL_SRC_IP = __constant_htons(0x0102),
499 SCTP_ERROR_ASCONF_ACK = __constant_htons(0x0103),
500 SCTP_ERROR_REQ_REFUSED = __constant_htons(0x0104),
501
502 /* AUTH Section 4. New Error Cause
503 *
504 * This section defines a new error cause that will be sent if an AUTH
505 * chunk is received with an unsupported HMAC identifier.
506 * illustrates the new error cause.
507 *
508 * Cause Code Error Cause Name
509 * --------------------------------------------------------------
510 * 0x0105 Unsupported HMAC Identifier
511 */
512 SCTP_ERROR_UNSUP_HMAC = __constant_htons(0x0105)
513 } sctp_error_t;
514
515
516
517 /* RFC 2960. Appendix A. Explicit Congestion Notification.
518 * Explicit Congestion Notification Echo (ECNE) (12)
519 */
520 typedef struct sctp_ecnehdr {
521 __be32 lowest_tsn;
522 } sctp_ecnehdr_t;
523
524 typedef struct sctp_ecne_chunk {
525 sctp_chunkhdr_t chunk_hdr;
526 sctp_ecnehdr_t ence_hdr;
527 } __attribute__((packed)) sctp_ecne_chunk_t;
528
529 /* RFC 2960. Appendix A. Explicit Congestion Notification.
530 * Congestion Window Reduced (CWR) (13)
531 */
532 typedef struct sctp_cwrhdr {
533 __be32 lowest_tsn;
534 } sctp_cwrhdr_t;
535
536 typedef struct sctp_cwr_chunk {
537 sctp_chunkhdr_t chunk_hdr;
538 sctp_cwrhdr_t cwr_hdr;
539 } __attribute__((packed)) sctp_cwr_chunk_t;
540
541 /* PR-SCTP
542 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
543 *
544 * Forward Cumulative TSN chunk has the following format:
545 *
546 * 0 1 2 3
547 * 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
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Type = 192 | Flags = 0x00 | Length = Variable |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 * | New Cumulative TSN |
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 * | Stream-1 | Stream Sequence-1 |
554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555 * \ /
556 * / \
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558 * | Stream-N | Stream Sequence-N |
559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
560 *
561 * Chunk Flags:
562 *
563 * Set to all zeros on transmit and ignored on receipt.
564 *
565 * New Cumulative TSN: 32 bit u_int
566 *
567 * This indicates the new cumulative TSN to the data receiver. Upon
568 * the reception of this value, the data receiver MUST consider
569 * any missing TSNs earlier than or equal to this value as received
570 * and stop reporting them as gaps in any subsequent SACKs.
571 *
572 * Stream-N: 16 bit u_int
573 *
574 * This field holds a stream number that was skipped by this
575 * FWD-TSN.
576 *
577 * Stream Sequence-N: 16 bit u_int
578 * This field holds the sequence number associated with the stream
579 * that was skipped. The stream sequence field holds the largest stream
580 * sequence number in this stream being skipped. The receiver of
581 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
582 * to enable delivery of any stranded TSN's that remain on the stream
583 * re-ordering queues. This field MUST NOT report TSN's corresponding
584 * to DATA chunk that are marked as unordered. For ordered DATA
585 * chunks this field MUST be filled in.
586 */
587 struct sctp_fwdtsn_skip {
588 __be16 stream;
589 __be16 ssn;
590 } __attribute__((packed));
591
592 struct sctp_fwdtsn_hdr {
593 __be32 new_cum_tsn;
594 struct sctp_fwdtsn_skip skip[0];
595 } __attribute((packed));
596
597 struct sctp_fwdtsn_chunk {
598 struct sctp_chunkhdr chunk_hdr;
599 struct sctp_fwdtsn_hdr fwdtsn_hdr;
600 } __attribute((packed));
601
602
603 /* ADDIP
604 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
605 *
606 * Serial Number: 32 bits (unsigned integer)
607 * This value represents a Serial Number for the ASCONF Chunk. The
608 * valid range of Serial Number is from 0 to 2^32-1.
609 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
610 *
611 * Address Parameter: 8 or 20 bytes (depending on type)
612 * The address is an address of the sender of the ASCONF chunk,
613 * the address MUST be considered part of the association by the
614 * peer endpoint. This field may be used by the receiver of the
615 * ASCONF to help in finding the association. This parameter MUST
616 * be present in every ASCONF message i.e. it is a mandatory TLV
617 * parameter.
618 *
619 * ASCONF Parameter: TLV format
620 * Each Address configuration change is represented by a TLV
621 * parameter as defined in Section 3.2. One or more requests may
622 * be present in an ASCONF Chunk.
623 *
624 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
625 *
626 * Serial Number: 32 bits (unsigned integer)
627 * This value represents the Serial Number for the received ASCONF
628 * Chunk that is acknowledged by this chunk. This value is copied
629 * from the received ASCONF Chunk.
630 *
631 * ASCONF Parameter Response: TLV format
632 * The ASCONF Parameter Response is used in the ASCONF-ACK to
633 * report status of ASCONF processing.
634 */
635 typedef struct sctp_addip_param {
636 sctp_paramhdr_t param_hdr;
637 __be32 crr_id;
638 } __attribute__((packed)) sctp_addip_param_t;
639
640 typedef struct sctp_addiphdr {
641 __be32 serial;
642 __u8 params[0];
643 } __attribute__((packed)) sctp_addiphdr_t;
644
645 typedef struct sctp_addip_chunk {
646 sctp_chunkhdr_t chunk_hdr;
647 sctp_addiphdr_t addip_hdr;
648 } __attribute__((packed)) sctp_addip_chunk_t;
649
650 /* AUTH
651 * Section 4.1 Authentication Chunk (AUTH)
652 *
653 * This chunk is used to hold the result of the HMAC calculation.
654 *
655 * 0 1 2 3
656 * 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
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
658 * | Type = 0x0F | Flags=0 | Length |
659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
660 * | Shared Key Identifier | HMAC Identifier |
661 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
662 * | |
663 * \ HMAC /
664 * / \
665 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
666 *
667 * Type: 1 byte (unsigned integer)
668 * This value MUST be set to 0x0F for all AUTH-chunks.
669 *
670 * Flags: 1 byte (unsigned integer)
671 * Set to zero on transmit and ignored on receipt.
672 *
673 * Length: 2 bytes (unsigned integer)
674 * This value holds the length of the HMAC in bytes plus 8.
675 *
676 * Shared Key Identifier: 2 bytes (unsigned integer)
677 * This value describes which endpoint pair shared key is used.
678 *
679 * HMAC Identifier: 2 bytes (unsigned integer)
680 * This value describes which message digest is being used. Table 2
681 * shows the currently defined values.
682 *
683 * The following Table 2 shows the currently defined values for HMAC
684 * identifiers.
685 *
686 * +-----------------+--------------------------+
687 * | HMAC Identifier | Message Digest Algorithm |
688 * +-----------------+--------------------------+
689 * | 0 | Reserved |
690 * | 1 | SHA-1 defined in [8] |
691 * | 2 | Reserved |
692 * | 3 | SHA-256 defined in [8] |
693 * +-----------------+--------------------------+
694 *
695 *
696 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
697 * calculation.
698 */
699 typedef struct sctp_authhdr {
700 __be16 shkey_id;
701 __be16 hmac_id;
702 __u8 hmac[0];
703 } __attribute__((packed)) sctp_authhdr_t;
704
705 typedef struct sctp_auth_chunk {
706 sctp_chunkhdr_t chunk_hdr;
707 sctp_authhdr_t auth_hdr;
708 } __attribute__((packed)) sctp_auth_chunk_t;
709
710 #endif /* __LINUX_SCTP_H__ */
711