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 typedef struct sctphdr {
61 __be16 source;
62 __be16 dest;
63 __be32 vtag;
64 __le32 checksum;
65 } __packed sctp_sctphdr_t;
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 typedef struct sctp_chunkhdr {
74 __u8 type;
75 __u8 flags;
76 __be16 length;
77 } __packed sctp_chunkhdr_t;
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 typedef enum {
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_t; /* enum */
112
113
114 /* Section 3.2
115 * Chunk Types are encoded such that the highest-order two bits specify
116 * the action that must be taken if the processing endpoint does not
117 * recognize the Chunk Type.
118 */
119 typedef enum {
120 SCTP_CID_ACTION_DISCARD = 0x00,
121 SCTP_CID_ACTION_DISCARD_ERR = 0x40,
122 SCTP_CID_ACTION_SKIP = 0x80,
123 SCTP_CID_ACTION_SKIP_ERR = 0xc0,
124 } sctp_cid_action_t;
125
126 enum { SCTP_CID_ACTION_MASK = 0xc0, };
127
128 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
129 *
130 * 3.3.7 Abort Association (ABORT) (6):
131 * The T bit is set to 0 if the sender had a TCB that it destroyed.
132 * If the sender did not have a TCB it should set this bit to 1.
133 */
134 enum { SCTP_CHUNK_FLAG_T = 0x01 };
135
136 /*
137 * Set the T bit
138 *
139 * 0 1 2 3
140 * 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
141 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
142 * | Type = 14 |Reserved |T| Length = 4 |
143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
144 *
145 * Chunk Flags: 8 bits
146 *
147 * Reserved: 7 bits
148 * Set to 0 on transmit and ignored on receipt.
149 *
150 * T bit: 1 bit
151 * The T bit is set to 0 if the sender had a TCB that it destroyed. If
152 * the sender did NOT have a TCB it should set this bit to 1.
153 *
154 * Note: Special rules apply to this chunk for verification, please
155 * see Section 8.5.1 for details.
156 */
157
158 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
159
160 /* RFC 2960
161 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
162 */
163
164 typedef struct sctp_paramhdr {
165 __be16 type;
166 __be16 length;
167 } __packed sctp_paramhdr_t;
168
169 typedef enum {
170
171 /* RFC 2960 Section 3.3.5 */
172 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
173 /* RFC 2960 Section 3.3.2.1 */
174 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
175 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
176 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
177 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
178 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
179 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
180 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
181 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
182
183 /* AUTH Extension Section 3 */
184 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
185 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
186 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
187
188 /* Add-IP: Supported Extensions, Section 4.2 */
189 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
190
191 /* PR-SCTP Sec 3.1 */
192 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
193
194 /* Add-IP Extension. Section 3.2 */
195 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
196 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
197 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
198 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
199 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
200 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
201
202 } sctp_param_t; /* enum */
203
204
205 /* RFC 2960 Section 3.2.1
206 * The Parameter Types are encoded such that the highest-order two bits
207 * specify the action that must be taken if the processing endpoint does
208 * not recognize the Parameter Type.
209 *
210 */
211 typedef enum {
212 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
213 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
214 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
215 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
216 } sctp_param_action_t;
217
218 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
219
220 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
221
222 typedef struct sctp_datahdr {
223 __be32 tsn;
224 __be16 stream;
225 __be16 ssn;
226 __be32 ppid;
227 __u8 payload[0];
228 } __packed sctp_datahdr_t;
229
230 typedef struct sctp_data_chunk {
231 sctp_chunkhdr_t chunk_hdr;
232 sctp_datahdr_t data_hdr;
233 } __packed sctp_data_chunk_t;
234
235 /* DATA Chuck Specific Flags */
236 enum {
237 SCTP_DATA_MIDDLE_FRAG = 0x00,
238 SCTP_DATA_LAST_FRAG = 0x01,
239 SCTP_DATA_FIRST_FRAG = 0x02,
240 SCTP_DATA_NOT_FRAG = 0x03,
241 SCTP_DATA_UNORDERED = 0x04,
242 SCTP_DATA_SACK_IMM = 0x08,
243 };
244 enum { SCTP_DATA_FRAG_MASK = 0x03, };
245
246
247 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
248 *
249 * This chunk is used to initiate a SCTP association between two
250 * endpoints.
251 */
252 typedef struct sctp_inithdr {
253 __be32 init_tag;
254 __be32 a_rwnd;
255 __be16 num_outbound_streams;
256 __be16 num_inbound_streams;
257 __be32 initial_tsn;
258 __u8 params[0];
259 } __packed sctp_inithdr_t;
260
261 typedef struct sctp_init_chunk {
262 sctp_chunkhdr_t chunk_hdr;
263 sctp_inithdr_t init_hdr;
264 } __packed sctp_init_chunk_t;
265
266
267 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
268 typedef struct sctp_ipv4addr_param {
269 sctp_paramhdr_t param_hdr;
270 struct in_addr addr;
271 } __packed sctp_ipv4addr_param_t;
272
273 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
274 typedef struct sctp_ipv6addr_param {
275 sctp_paramhdr_t param_hdr;
276 struct in6_addr addr;
277 } __packed sctp_ipv6addr_param_t;
278
279 /* Section 3.3.2.1 Cookie Preservative (9) */
280 typedef struct sctp_cookie_preserve_param {
281 sctp_paramhdr_t param_hdr;
282 __be32 lifespan_increment;
283 } __packed sctp_cookie_preserve_param_t;
284
285 /* Section 3.3.2.1 Host Name Address (11) */
286 typedef struct sctp_hostname_param {
287 sctp_paramhdr_t param_hdr;
288 uint8_t hostname[0];
289 } __packed sctp_hostname_param_t;
290
291 /* Section 3.3.2.1 Supported Address Types (12) */
292 typedef struct sctp_supported_addrs_param {
293 sctp_paramhdr_t param_hdr;
294 __be16 types[0];
295 } __packed sctp_supported_addrs_param_t;
296
297 /* Appendix A. ECN Capable (32768) */
298 typedef struct sctp_ecn_capable_param {
299 sctp_paramhdr_t param_hdr;
300 } __packed sctp_ecn_capable_param_t;
301
302 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
303 typedef struct sctp_adaptation_ind_param {
304 struct sctp_paramhdr param_hdr;
305 __be32 adaptation_ind;
306 } __packed sctp_adaptation_ind_param_t;
307
308 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
309 typedef struct sctp_supported_ext_param {
310 struct sctp_paramhdr param_hdr;
311 __u8 chunks[0];
312 } __packed sctp_supported_ext_param_t;
313
314 /* AUTH Section 3.1 Random */
315 typedef struct sctp_random_param {
316 sctp_paramhdr_t param_hdr;
317 __u8 random_val[0];
318 } __packed sctp_random_param_t;
319
320 /* AUTH Section 3.2 Chunk List */
321 typedef struct sctp_chunks_param {
322 sctp_paramhdr_t param_hdr;
323 __u8 chunks[0];
324 } __packed sctp_chunks_param_t;
325
326 /* AUTH Section 3.3 HMAC Algorithm */
327 typedef struct sctp_hmac_algo_param {
328 sctp_paramhdr_t param_hdr;
329 __be16 hmac_ids[0];
330 } __packed sctp_hmac_algo_param_t;
331
332 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
333 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
334 * association.
335 */
336 typedef sctp_init_chunk_t sctp_initack_chunk_t;
337
338 /* Section 3.3.3.1 State Cookie (7) */
339 typedef struct sctp_cookie_param {
340 sctp_paramhdr_t p;
341 __u8 body[0];
342 } __packed sctp_cookie_param_t;
343
344 /* Section 3.3.3.1 Unrecognized Parameters (8) */
345 typedef struct sctp_unrecognized_param {
346 sctp_paramhdr_t param_hdr;
347 sctp_paramhdr_t unrecognized;
348 } __packed sctp_unrecognized_param_t;
349
350
351
352 /*
353 * 3.3.4 Selective Acknowledgement (SACK) (3):
354 *
355 * This chunk is sent to the peer endpoint to acknowledge received DATA
356 * chunks and to inform the peer endpoint of gaps in the received
357 * subsequences of DATA chunks as represented by their TSNs.
358 */
359
360 typedef struct sctp_gap_ack_block {
361 __be16 start;
362 __be16 end;
363 } __packed sctp_gap_ack_block_t;
364
365 typedef __be32 sctp_dup_tsn_t;
366
367 typedef union {
368 sctp_gap_ack_block_t gab;
369 sctp_dup_tsn_t dup;
370 } sctp_sack_variable_t;
371
372 typedef struct sctp_sackhdr {
373 __be32 cum_tsn_ack;
374 __be32 a_rwnd;
375 __be16 num_gap_ack_blocks;
376 __be16 num_dup_tsns;
377 sctp_sack_variable_t variable[0];
378 } __packed sctp_sackhdr_t;
379
380 typedef struct sctp_sack_chunk {
381 sctp_chunkhdr_t chunk_hdr;
382 sctp_sackhdr_t sack_hdr;
383 } __packed sctp_sack_chunk_t;
384
385
386 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
387 *
388 * An endpoint should send this chunk to its peer endpoint to probe the
389 * reachability of a particular destination transport address defined in
390 * the present association.
391 */
392
393 typedef struct sctp_heartbeathdr {
394 sctp_paramhdr_t info;
395 } __packed sctp_heartbeathdr_t;
396
397 typedef struct sctp_heartbeat_chunk {
398 sctp_chunkhdr_t chunk_hdr;
399 sctp_heartbeathdr_t hb_hdr;
400 } __packed sctp_heartbeat_chunk_t;
401
402
403 /* For the abort and shutdown ACK we must carry the init tag in the
404 * common header. Just the common header is all that is needed with a
405 * chunk descriptor.
406 */
407 typedef struct sctp_abort_chunk {
408 sctp_chunkhdr_t uh;
409 } __packed sctp_abort_chunk_t;
410
411
412 /* For the graceful shutdown we must carry the tag (in common header)
413 * and the highest consecutive acking value.
414 */
415 typedef struct sctp_shutdownhdr {
416 __be32 cum_tsn_ack;
417 } __packed sctp_shutdownhdr_t;
418
419 struct sctp_shutdown_chunk_t {
420 sctp_chunkhdr_t chunk_hdr;
421 sctp_shutdownhdr_t shutdown_hdr;
422 } __packed;
423
424 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
425
426 typedef struct sctp_errhdr {
427 __be16 cause;
428 __be16 length;
429 __u8 variable[0];
430 } __packed sctp_errhdr_t;
431
432 typedef struct sctp_operr_chunk {
433 sctp_chunkhdr_t chunk_hdr;
434 sctp_errhdr_t err_hdr;
435 } __packed sctp_operr_chunk_t;
436
437 /* RFC 2960 3.3.10 - Operation Error
438 *
439 * Cause Code: 16 bits (unsigned integer)
440 *
441 * Defines the type of error conditions being reported.
442 * Cause Code
443 * Value Cause Code
444 * --------- ----------------
445 * 1 Invalid Stream Identifier
446 * 2 Missing Mandatory Parameter
447 * 3 Stale Cookie Error
448 * 4 Out of Resource
449 * 5 Unresolvable Address
450 * 6 Unrecognized Chunk Type
451 * 7 Invalid Mandatory Parameter
452 * 8 Unrecognized Parameters
453 * 9 No User Data
454 * 10 Cookie Received While Shutting Down
455 */
456 typedef enum {
457
458 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
459 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
460 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
461 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
462 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
463 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
464 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
465 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
466 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
467 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
468 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
469
470
471 /* SCTP Implementation Guide:
472 * 11 Restart of an association with new addresses
473 * 12 User Initiated Abort
474 * 13 Protocol Violation
475 */
476
477 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
478 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
479 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
480
481 /* ADDIP Section 3.3 New Error Causes
482 *
483 * Four new Error Causes are added to the SCTP Operational Errors,
484 * primarily for use in the ASCONF-ACK chunk.
485 *
486 * Value Cause Code
487 * --------- ----------------
488 * 0x00A0 Request to Delete Last Remaining IP Address.
489 * 0x00A1 Operation Refused Due to Resource Shortage.
490 * 0x00A2 Request to Delete Source IP Address.
491 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
492 * 0x00A4 Request refused - no authorization.
493 */
494 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
495 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
496 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
497 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
498 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
499
500 /* AUTH Section 4. New Error Cause
501 *
502 * This section defines a new error cause that will be sent if an AUTH
503 * chunk is received with an unsupported HMAC identifier.
504 * illustrates the new error cause.
505 *
506 * Cause Code Error Cause Name
507 * --------------------------------------------------------------
508 * 0x0105 Unsupported HMAC Identifier
509 */
510 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
511 } sctp_error_t;
512
513
514
515 /* RFC 2960. Appendix A. Explicit Congestion Notification.
516 * Explicit Congestion Notification Echo (ECNE) (12)
517 */
518 typedef struct sctp_ecnehdr {
519 __be32 lowest_tsn;
520 } sctp_ecnehdr_t;
521
522 typedef struct sctp_ecne_chunk {
523 sctp_chunkhdr_t chunk_hdr;
524 sctp_ecnehdr_t ence_hdr;
525 } __packed sctp_ecne_chunk_t;
526
527 /* RFC 2960. Appendix A. Explicit Congestion Notification.
528 * Congestion Window Reduced (CWR) (13)
529 */
530 typedef struct sctp_cwrhdr {
531 __be32 lowest_tsn;
532 } sctp_cwrhdr_t;
533
534 typedef struct sctp_cwr_chunk {
535 sctp_chunkhdr_t chunk_hdr;
536 sctp_cwrhdr_t cwr_hdr;
537 } __packed sctp_cwr_chunk_t;
538
539 /* PR-SCTP
540 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
541 *
542 * Forward Cumulative TSN chunk has the following format:
543 *
544 * 0 1 2 3
545 * 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
546 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
547 * | Type = 192 | Flags = 0x00 | Length = Variable |
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | New Cumulative TSN |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 * | Stream-1 | Stream Sequence-1 |
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 * \ /
554 * / \
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * | Stream-N | Stream Sequence-N |
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558 *
559 * Chunk Flags:
560 *
561 * Set to all zeros on transmit and ignored on receipt.
562 *
563 * New Cumulative TSN: 32 bit u_int
564 *
565 * This indicates the new cumulative TSN to the data receiver. Upon
566 * the reception of this value, the data receiver MUST consider
567 * any missing TSNs earlier than or equal to this value as received
568 * and stop reporting them as gaps in any subsequent SACKs.
569 *
570 * Stream-N: 16 bit u_int
571 *
572 * This field holds a stream number that was skipped by this
573 * FWD-TSN.
574 *
575 * Stream Sequence-N: 16 bit u_int
576 * This field holds the sequence number associated with the stream
577 * that was skipped. The stream sequence field holds the largest stream
578 * sequence number in this stream being skipped. The receiver of
579 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
580 * to enable delivery of any stranded TSN's that remain on the stream
581 * re-ordering queues. This field MUST NOT report TSN's corresponding
582 * to DATA chunk that are marked as unordered. For ordered DATA
583 * chunks this field MUST be filled in.
584 */
585 struct sctp_fwdtsn_skip {
586 __be16 stream;
587 __be16 ssn;
588 } __packed;
589
590 struct sctp_fwdtsn_hdr {
591 __be32 new_cum_tsn;
592 struct sctp_fwdtsn_skip skip[0];
593 } __packed;
594
595 struct sctp_fwdtsn_chunk {
596 struct sctp_chunkhdr chunk_hdr;
597 struct sctp_fwdtsn_hdr fwdtsn_hdr;
598 } __packed;
599
600
601 /* ADDIP
602 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
603 *
604 * Serial Number: 32 bits (unsigned integer)
605 * This value represents a Serial Number for the ASCONF Chunk. The
606 * valid range of Serial Number is from 0 to 2^32-1.
607 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
608 *
609 * Address Parameter: 8 or 20 bytes (depending on type)
610 * The address is an address of the sender of the ASCONF chunk,
611 * the address MUST be considered part of the association by the
612 * peer endpoint. This field may be used by the receiver of the
613 * ASCONF to help in finding the association. This parameter MUST
614 * be present in every ASCONF message i.e. it is a mandatory TLV
615 * parameter.
616 *
617 * ASCONF Parameter: TLV format
618 * Each Address configuration change is represented by a TLV
619 * parameter as defined in Section 3.2. One or more requests may
620 * be present in an ASCONF Chunk.
621 *
622 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
623 *
624 * Serial Number: 32 bits (unsigned integer)
625 * This value represents the Serial Number for the received ASCONF
626 * Chunk that is acknowledged by this chunk. This value is copied
627 * from the received ASCONF Chunk.
628 *
629 * ASCONF Parameter Response: TLV format
630 * The ASCONF Parameter Response is used in the ASCONF-ACK to
631 * report status of ASCONF processing.
632 */
633 typedef struct sctp_addip_param {
634 sctp_paramhdr_t param_hdr;
635 __be32 crr_id;
636 } __packed sctp_addip_param_t;
637
638 typedef struct sctp_addiphdr {
639 __be32 serial;
640 __u8 params[0];
641 } __packed sctp_addiphdr_t;
642
643 typedef struct sctp_addip_chunk {
644 sctp_chunkhdr_t chunk_hdr;
645 sctp_addiphdr_t addip_hdr;
646 } __packed sctp_addip_chunk_t;
647
648 /* AUTH
649 * Section 4.1 Authentication Chunk (AUTH)
650 *
651 * This chunk is used to hold the result of the HMAC calculation.
652 *
653 * 0 1 2 3
654 * 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
655 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656 * | Type = 0x0F | Flags=0 | Length |
657 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
658 * | Shared Key Identifier | HMAC Identifier |
659 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
660 * | |
661 * \ HMAC /
662 * / \
663 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664 *
665 * Type: 1 byte (unsigned integer)
666 * This value MUST be set to 0x0F for all AUTH-chunks.
667 *
668 * Flags: 1 byte (unsigned integer)
669 * Set to zero on transmit and ignored on receipt.
670 *
671 * Length: 2 bytes (unsigned integer)
672 * This value holds the length of the HMAC in bytes plus 8.
673 *
674 * Shared Key Identifier: 2 bytes (unsigned integer)
675 * This value describes which endpoint pair shared key is used.
676 *
677 * HMAC Identifier: 2 bytes (unsigned integer)
678 * This value describes which message digest is being used. Table 2
679 * shows the currently defined values.
680 *
681 * The following Table 2 shows the currently defined values for HMAC
682 * identifiers.
683 *
684 * +-----------------+--------------------------+
685 * | HMAC Identifier | Message Digest Algorithm |
686 * +-----------------+--------------------------+
687 * | 0 | Reserved |
688 * | 1 | SHA-1 defined in [8] |
689 * | 2 | Reserved |
690 * | 3 | SHA-256 defined in [8] |
691 * +-----------------+--------------------------+
692 *
693 *
694 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
695 * calculation.
696 */
697 typedef struct sctp_authhdr {
698 __be16 shkey_id;
699 __be16 hmac_id;
700 __u8 hmac[0];
701 } __packed sctp_authhdr_t;
702
703 typedef struct sctp_auth_chunk {
704 sctp_chunkhdr_t chunk_hdr;
705 sctp_authhdr_t auth_hdr;
706 } __packed sctp_auth_chunk_t;
707
708 struct sctp_infox {
709 struct sctp_info *sctpinfo;
710 struct sctp_association *asoc;
711 };
712
713 #endif /* __LINUX_SCTP_H__ */
714