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 /* sctp ndata 5.1. I-DATA */
106 SCTP_CID_I_DATA = 0x40,
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_I_FWD_TSN = 0xC2,
114 SCTP_CID_ASCONF_ACK = 0x80,
115 SCTP_CID_RECONF = 0x82,
116 }; /* enum */
117
118
119 /* Section 3.2
120 * Chunk Types are encoded such that the highest-order two bits specify
121 * the action that must be taken if the processing endpoint does not
122 * recognize the Chunk Type.
123 */
124 enum {
125 SCTP_CID_ACTION_DISCARD = 0x00,
126 SCTP_CID_ACTION_DISCARD_ERR = 0x40,
127 SCTP_CID_ACTION_SKIP = 0x80,
128 SCTP_CID_ACTION_SKIP_ERR = 0xc0,
129 };
130
131 enum { SCTP_CID_ACTION_MASK = 0xc0, };
132
133 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
134 *
135 * 3.3.7 Abort Association (ABORT) (6):
136 * The T bit is set to 0 if the sender had a TCB that it destroyed.
137 * If the sender did not have a TCB it should set this bit to 1.
138 */
139 enum { SCTP_CHUNK_FLAG_T = 0x01 };
140
141 /*
142 * Set the T bit
143 *
144 * 0 1 2 3
145 * 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
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 * | Type = 14 |Reserved |T| Length = 4 |
148 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149 *
150 * Chunk Flags: 8 bits
151 *
152 * Reserved: 7 bits
153 * Set to 0 on transmit and ignored on receipt.
154 *
155 * T bit: 1 bit
156 * The T bit is set to 0 if the sender had a TCB that it destroyed. If
157 * the sender did NOT have a TCB it should set this bit to 1.
158 *
159 * Note: Special rules apply to this chunk for verification, please
160 * see Section 8.5.1 for details.
161 */
162
163 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
164
165 /* RFC 2960
166 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
167 */
168
169 struct sctp_paramhdr {
170 __be16 type;
171 __be16 length;
172 };
173
174 enum sctp_param {
175
176 /* RFC 2960 Section 3.3.5 */
177 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
178 /* RFC 2960 Section 3.3.2.1 */
179 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
180 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
181 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
182 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
183 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
184 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
185 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
186 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
187
188 /* AUTH Extension Section 3 */
189 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
190 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
191 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
192
193 /* Add-IP: Supported Extensions, Section 4.2 */
194 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
195
196 /* PR-SCTP Sec 3.1 */
197 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
198
199 /* Add-IP Extension. Section 3.2 */
200 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
201 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
202 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
203 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
204 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
205 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
206
207 /* RE-CONFIG. Section 4 */
208 SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d),
209 SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e),
210 SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f),
211 SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010),
212 SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011),
213 SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012),
214 }; /* enum */
215
216
217 /* RFC 2960 Section 3.2.1
218 * The Parameter Types are encoded such that the highest-order two bits
219 * specify the action that must be taken if the processing endpoint does
220 * not recognize the Parameter Type.
221 *
222 */
223 enum {
224 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
225 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
226 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
227 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
228 };
229
230 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
231
232 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
233
234 struct sctp_datahdr {
235 __be32 tsn;
236 __be16 stream;
237 __be16 ssn;
238 __u32 ppid;
239 __u8 payload[0];
240 };
241
242 struct sctp_data_chunk {
243 struct sctp_chunkhdr chunk_hdr;
244 struct sctp_datahdr data_hdr;
245 };
246
247 struct sctp_idatahdr {
248 __be32 tsn;
249 __be16 stream;
250 __be16 reserved;
251 __be32 mid;
252 union {
253 __u32 ppid;
254 __be32 fsn;
255 };
256 __u8 payload[0];
257 };
258
259 struct sctp_idata_chunk {
260 struct sctp_chunkhdr chunk_hdr;
261 struct sctp_idatahdr data_hdr;
262 };
263
264 /* DATA Chuck Specific Flags */
265 enum {
266 SCTP_DATA_MIDDLE_FRAG = 0x00,
267 SCTP_DATA_LAST_FRAG = 0x01,
268 SCTP_DATA_FIRST_FRAG = 0x02,
269 SCTP_DATA_NOT_FRAG = 0x03,
270 SCTP_DATA_UNORDERED = 0x04,
271 SCTP_DATA_SACK_IMM = 0x08,
272 };
273 enum { SCTP_DATA_FRAG_MASK = 0x03, };
274
275
276 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
277 *
278 * This chunk is used to initiate a SCTP association between two
279 * endpoints.
280 */
281 struct sctp_inithdr {
282 __be32 init_tag;
283 __be32 a_rwnd;
284 __be16 num_outbound_streams;
285 __be16 num_inbound_streams;
286 __be32 initial_tsn;
287 __u8 params[0];
288 };
289
290 struct sctp_init_chunk {
291 struct sctp_chunkhdr chunk_hdr;
292 struct sctp_inithdr init_hdr;
293 };
294
295
296 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
297 struct sctp_ipv4addr_param {
298 struct sctp_paramhdr param_hdr;
299 struct in_addr addr;
300 };
301
302 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
303 struct sctp_ipv6addr_param {
304 struct sctp_paramhdr param_hdr;
305 struct in6_addr addr;
306 };
307
308 /* Section 3.3.2.1 Cookie Preservative (9) */
309 struct sctp_cookie_preserve_param {
310 struct sctp_paramhdr param_hdr;
311 __be32 lifespan_increment;
312 };
313
314 /* Section 3.3.2.1 Host Name Address (11) */
315 struct sctp_hostname_param {
316 struct sctp_paramhdr param_hdr;
317 uint8_t hostname[0];
318 };
319
320 /* Section 3.3.2.1 Supported Address Types (12) */
321 struct sctp_supported_addrs_param {
322 struct sctp_paramhdr param_hdr;
323 __be16 types[0];
324 };
325
326 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
327 struct sctp_adaptation_ind_param {
328 struct sctp_paramhdr param_hdr;
329 __be32 adaptation_ind;
330 };
331
332 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
333 struct sctp_supported_ext_param {
334 struct sctp_paramhdr param_hdr;
335 __u8 chunks[0];
336 };
337
338 /* AUTH Section 3.1 Random */
339 struct sctp_random_param {
340 struct sctp_paramhdr param_hdr;
341 __u8 random_val[0];
342 };
343
344 /* AUTH Section 3.2 Chunk List */
345 struct sctp_chunks_param {
346 struct sctp_paramhdr param_hdr;
347 __u8 chunks[0];
348 };
349
350 /* AUTH Section 3.3 HMAC Algorithm */
351 struct sctp_hmac_algo_param {
352 struct sctp_paramhdr param_hdr;
353 __be16 hmac_ids[0];
354 };
355
356 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
357 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
358 * association.
359 */
360 struct sctp_initack_chunk {
361 struct sctp_chunkhdr chunk_hdr;
362 struct sctp_inithdr init_hdr;
363 };
364
365 /* Section 3.3.3.1 State Cookie (7) */
366 struct sctp_cookie_param {
367 struct sctp_paramhdr p;
368 __u8 body[0];
369 };
370
371 /* Section 3.3.3.1 Unrecognized Parameters (8) */
372 struct sctp_unrecognized_param {
373 struct sctp_paramhdr param_hdr;
374 struct sctp_paramhdr unrecognized;
375 };
376
377
378
379 /*
380 * 3.3.4 Selective Acknowledgement (SACK) (3):
381 *
382 * This chunk is sent to the peer endpoint to acknowledge received DATA
383 * chunks and to inform the peer endpoint of gaps in the received
384 * subsequences of DATA chunks as represented by their TSNs.
385 */
386
387 struct sctp_gap_ack_block {
388 __be16 start;
389 __be16 end;
390 };
391
392 union sctp_sack_variable {
393 struct sctp_gap_ack_block gab;
394 __be32 dup;
395 };
396
397 struct sctp_sackhdr {
398 __be32 cum_tsn_ack;
399 __be32 a_rwnd;
400 __be16 num_gap_ack_blocks;
401 __be16 num_dup_tsns;
402 union sctp_sack_variable variable[0];
403 };
404
405 struct sctp_sack_chunk {
406 struct sctp_chunkhdr chunk_hdr;
407 struct sctp_sackhdr sack_hdr;
408 };
409
410
411 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
412 *
413 * An endpoint should send this chunk to its peer endpoint to probe the
414 * reachability of a particular destination transport address defined in
415 * the present association.
416 */
417
418 struct sctp_heartbeathdr {
419 struct sctp_paramhdr info;
420 };
421
422 struct sctp_heartbeat_chunk {
423 struct sctp_chunkhdr chunk_hdr;
424 struct sctp_heartbeathdr hb_hdr;
425 };
426
427
428 /* For the abort and shutdown ACK we must carry the init tag in the
429 * common header. Just the common header is all that is needed with a
430 * chunk descriptor.
431 */
432 struct sctp_abort_chunk {
433 struct sctp_chunkhdr uh;
434 };
435
436
437 /* For the graceful shutdown we must carry the tag (in common header)
438 * and the highest consecutive acking value.
439 */
440 struct sctp_shutdownhdr {
441 __be32 cum_tsn_ack;
442 };
443
444 struct sctp_shutdown_chunk {
445 struct sctp_chunkhdr chunk_hdr;
446 struct sctp_shutdownhdr shutdown_hdr;
447 };
448
449 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
450
451 struct sctp_errhdr {
452 __be16 cause;
453 __be16 length;
454 __u8 variable[0];
455 };
456
457 struct sctp_operr_chunk {
458 struct sctp_chunkhdr chunk_hdr;
459 struct sctp_errhdr err_hdr;
460 };
461
462 /* RFC 2960 3.3.10 - Operation Error
463 *
464 * Cause Code: 16 bits (unsigned integer)
465 *
466 * Defines the type of error conditions being reported.
467 * Cause Code
468 * Value Cause Code
469 * --------- ----------------
470 * 1 Invalid Stream Identifier
471 * 2 Missing Mandatory Parameter
472 * 3 Stale Cookie Error
473 * 4 Out of Resource
474 * 5 Unresolvable Address
475 * 6 Unrecognized Chunk Type
476 * 7 Invalid Mandatory Parameter
477 * 8 Unrecognized Parameters
478 * 9 No User Data
479 * 10 Cookie Received While Shutting Down
480 */
481 enum sctp_error {
482
483 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
484 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
485 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
486 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
487 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
488 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
489 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
490 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
491 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
492 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
493 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
494
495
496 /* SCTP Implementation Guide:
497 * 11 Restart of an association with new addresses
498 * 12 User Initiated Abort
499 * 13 Protocol Violation
500 */
501
502 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
503 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
504 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
505
506 /* ADDIP Section 3.3 New Error Causes
507 *
508 * Four new Error Causes are added to the SCTP Operational Errors,
509 * primarily for use in the ASCONF-ACK chunk.
510 *
511 * Value Cause Code
512 * --------- ----------------
513 * 0x00A0 Request to Delete Last Remaining IP Address.
514 * 0x00A1 Operation Refused Due to Resource Shortage.
515 * 0x00A2 Request to Delete Source IP Address.
516 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
517 * 0x00A4 Request refused - no authorization.
518 */
519 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
520 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
521 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
522 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
523 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
524
525 /* AUTH Section 4. New Error Cause
526 *
527 * This section defines a new error cause that will be sent if an AUTH
528 * chunk is received with an unsupported HMAC identifier.
529 * illustrates the new error cause.
530 *
531 * Cause Code Error Cause Name
532 * --------------------------------------------------------------
533 * 0x0105 Unsupported HMAC Identifier
534 */
535 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
536 };
537
538
539
540 /* RFC 2960. Appendix A. Explicit Congestion Notification.
541 * Explicit Congestion Notification Echo (ECNE) (12)
542 */
543 struct sctp_ecnehdr {
544 __be32 lowest_tsn;
545 };
546
547 struct sctp_ecne_chunk {
548 struct sctp_chunkhdr chunk_hdr;
549 struct sctp_ecnehdr ence_hdr;
550 };
551
552 /* RFC 2960. Appendix A. Explicit Congestion Notification.
553 * Congestion Window Reduced (CWR) (13)
554 */
555 struct sctp_cwrhdr {
556 __be32 lowest_tsn;
557 };
558
559 /* PR-SCTP
560 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
561 *
562 * Forward Cumulative TSN chunk has the following format:
563 *
564 * 0 1 2 3
565 * 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
566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
567 * | Type = 192 | Flags = 0x00 | Length = Variable |
568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
569 * | New Cumulative TSN |
570 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
571 * | Stream-1 | Stream Sequence-1 |
572 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
573 * \ /
574 * / \
575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
576 * | Stream-N | Stream Sequence-N |
577 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
578 *
579 * Chunk Flags:
580 *
581 * Set to all zeros on transmit and ignored on receipt.
582 *
583 * New Cumulative TSN: 32 bit u_int
584 *
585 * This indicates the new cumulative TSN to the data receiver. Upon
586 * the reception of this value, the data receiver MUST consider
587 * any missing TSNs earlier than or equal to this value as received
588 * and stop reporting them as gaps in any subsequent SACKs.
589 *
590 * Stream-N: 16 bit u_int
591 *
592 * This field holds a stream number that was skipped by this
593 * FWD-TSN.
594 *
595 * Stream Sequence-N: 16 bit u_int
596 * This field holds the sequence number associated with the stream
597 * that was skipped. The stream sequence field holds the largest stream
598 * sequence number in this stream being skipped. The receiver of
599 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
600 * to enable delivery of any stranded TSN's that remain on the stream
601 * re-ordering queues. This field MUST NOT report TSN's corresponding
602 * to DATA chunk that are marked as unordered. For ordered DATA
603 * chunks this field MUST be filled in.
604 */
605 struct sctp_fwdtsn_skip {
606 __be16 stream;
607 __be16 ssn;
608 };
609
610 struct sctp_fwdtsn_hdr {
611 __be32 new_cum_tsn;
612 struct sctp_fwdtsn_skip skip[0];
613 };
614
615 struct sctp_fwdtsn_chunk {
616 struct sctp_chunkhdr chunk_hdr;
617 struct sctp_fwdtsn_hdr fwdtsn_hdr;
618 };
619
620 struct sctp_ifwdtsn_skip {
621 __be16 stream;
622 __u8 reserved;
623 __u8 flags;
624 __be32 mid;
625 };
626
627 struct sctp_ifwdtsn_hdr {
628 __be32 new_cum_tsn;
629 struct sctp_ifwdtsn_skip skip[0];
630 };
631
632 struct sctp_ifwdtsn_chunk {
633 struct sctp_chunkhdr chunk_hdr;
634 struct sctp_ifwdtsn_hdr fwdtsn_hdr;
635 };
636
637 /* ADDIP
638 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
639 *
640 * Serial Number: 32 bits (unsigned integer)
641 * This value represents a Serial Number for the ASCONF Chunk. The
642 * valid range of Serial Number is from 0 to 2^32-1.
643 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
644 *
645 * Address Parameter: 8 or 20 bytes (depending on type)
646 * The address is an address of the sender of the ASCONF chunk,
647 * the address MUST be considered part of the association by the
648 * peer endpoint. This field may be used by the receiver of the
649 * ASCONF to help in finding the association. This parameter MUST
650 * be present in every ASCONF message i.e. it is a mandatory TLV
651 * parameter.
652 *
653 * ASCONF Parameter: TLV format
654 * Each Address configuration change is represented by a TLV
655 * parameter as defined in Section 3.2. One or more requests may
656 * be present in an ASCONF Chunk.
657 *
658 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
659 *
660 * Serial Number: 32 bits (unsigned integer)
661 * This value represents the Serial Number for the received ASCONF
662 * Chunk that is acknowledged by this chunk. This value is copied
663 * from the received ASCONF Chunk.
664 *
665 * ASCONF Parameter Response: TLV format
666 * The ASCONF Parameter Response is used in the ASCONF-ACK to
667 * report status of ASCONF processing.
668 */
669 struct sctp_addip_param {
670 struct sctp_paramhdr param_hdr;
671 __be32 crr_id;
672 };
673
674 struct sctp_addiphdr {
675 __be32 serial;
676 __u8 params[0];
677 };
678
679 struct sctp_addip_chunk {
680 struct sctp_chunkhdr chunk_hdr;
681 struct sctp_addiphdr addip_hdr;
682 };
683
684 /* AUTH
685 * Section 4.1 Authentication Chunk (AUTH)
686 *
687 * This chunk is used to hold the result of the HMAC calculation.
688 *
689 * 0 1 2 3
690 * 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
691 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
692 * | Type = 0x0F | Flags=0 | Length |
693 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
694 * | Shared Key Identifier | HMAC Identifier |
695 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
696 * | |
697 * \ HMAC /
698 * / \
699 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
700 *
701 * Type: 1 byte (unsigned integer)
702 * This value MUST be set to 0x0F for all AUTH-chunks.
703 *
704 * Flags: 1 byte (unsigned integer)
705 * Set to zero on transmit and ignored on receipt.
706 *
707 * Length: 2 bytes (unsigned integer)
708 * This value holds the length of the HMAC in bytes plus 8.
709 *
710 * Shared Key Identifier: 2 bytes (unsigned integer)
711 * This value describes which endpoint pair shared key is used.
712 *
713 * HMAC Identifier: 2 bytes (unsigned integer)
714 * This value describes which message digest is being used. Table 2
715 * shows the currently defined values.
716 *
717 * The following Table 2 shows the currently defined values for HMAC
718 * identifiers.
719 *
720 * +-----------------+--------------------------+
721 * | HMAC Identifier | Message Digest Algorithm |
722 * +-----------------+--------------------------+
723 * | 0 | Reserved |
724 * | 1 | SHA-1 defined in [8] |
725 * | 2 | Reserved |
726 * | 3 | SHA-256 defined in [8] |
727 * +-----------------+--------------------------+
728 *
729 *
730 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
731 * calculation.
732 */
733 struct sctp_authhdr {
734 __be16 shkey_id;
735 __be16 hmac_id;
736 __u8 hmac[0];
737 };
738
739 struct sctp_auth_chunk {
740 struct sctp_chunkhdr chunk_hdr;
741 struct sctp_authhdr auth_hdr;
742 };
743
744 struct sctp_infox {
745 struct sctp_info *sctpinfo;
746 struct sctp_association *asoc;
747 };
748
749 struct sctp_reconf_chunk {
750 struct sctp_chunkhdr chunk_hdr;
751 __u8 params[0];
752 };
753
754 struct sctp_strreset_outreq {
755 struct sctp_paramhdr param_hdr;
756 __be32 request_seq;
757 __be32 response_seq;
758 __be32 send_reset_at_tsn;
759 __be16 list_of_streams[0];
760 };
761
762 struct sctp_strreset_inreq {
763 struct sctp_paramhdr param_hdr;
764 __be32 request_seq;
765 __be16 list_of_streams[0];
766 };
767
768 struct sctp_strreset_tsnreq {
769 struct sctp_paramhdr param_hdr;
770 __be32 request_seq;
771 };
772
773 struct sctp_strreset_addstrm {
774 struct sctp_paramhdr param_hdr;
775 __be32 request_seq;
776 __be16 number_of_streams;
777 __be16 reserved;
778 };
779
780 enum {
781 SCTP_STRRESET_NOTHING_TO_DO = 0x00,
782 SCTP_STRRESET_PERFORMED = 0x01,
783 SCTP_STRRESET_DENIED = 0x02,
784 SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
785 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
786 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
787 SCTP_STRRESET_IN_PROGRESS = 0x06,
788 };
789
790 struct sctp_strreset_resp {
791 struct sctp_paramhdr param_hdr;
792 __be32 response_seq;
793 __be32 result;
794 };
795
796 struct sctp_strreset_resptsn {
797 struct sctp_paramhdr param_hdr;
798 __be32 response_seq;
799 __be32 result;
800 __be32 senders_next_tsn;
801 __be32 receivers_next_tsn;
802 };
803
804 enum {
805 SCTP_DSCP_SET_MASK = 0x1,
806 SCTP_DSCP_VAL_MASK = 0xfc,
807 SCTP_FLOWLABEL_SET_MASK = 0x100000,
808 SCTP_FLOWLABEL_VAL_MASK = 0xfffff
809 };
810
811 #endif /* __LINUX_SCTP_H__ */
812