1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* SCTP kernel reference Implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001 Intel Corp.
7 * Copyright (c) 2001 Nokia, Inc.
8 * Copyright (c) 2001 La Monte H.P. Yarroll
9 *
10 * This file is part of the SCTP kernel reference Implementation
11 *
12 * Various protocol defined structures.
13 *
14 * Please send any bug reports or fixes you make to the
15 * email address(es):
16 * lksctp developers <linux-sctp@vger.kernel.org>
17 *
18 * Or submit a bug report through the following website:
19 * http://www.sf.net/projects/lksctp
20 *
21 * Written or modified by:
22 * La Monte H.P. Yarroll <piggy@acm.org>
23 * Karl Knutson <karl@athena.chicago.il.us>
24 * Jon Grimm <jgrimm@us.ibm.com>
25 * Xingang Guo <xingang.guo@intel.com>
26 * randall@sctp.chicago.il.us
27 * kmorneau@cisco.com
28 * qxie1@email.mot.com
29 * Sridhar Samudrala <sri@us.ibm.com>
30 * Kevin Gao <kevin.gao@intel.com>
31 *
32 * Any bugs reported given to us we will try to fix... any fixes shared will
33 * be incorporated into the next SCTP release.
34 */
35 #ifndef __LINUX_SCTP_H__
36 #define __LINUX_SCTP_H__
37
38 #include <linux/in.h> /* We need in_addr. */
39 #include <linux/in6.h> /* We need in6_addr. */
40 #include <linux/skbuff.h>
41
42 #include <uapi/linux/sctp.h>
43
44 /* Section 3.1. SCTP Common Header Format */
45 struct sctphdr {
46 __be16 source;
47 __be16 dest;
48 __be32 vtag;
49 __le32 checksum;
50 };
51
sctp_hdr(const struct sk_buff * skb)52 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
53 {
54 return (struct sctphdr *)skb_transport_header(skb);
55 }
56
57 /* Section 3.2. Chunk Field Descriptions. */
58 struct sctp_chunkhdr {
59 __u8 type;
60 __u8 flags;
61 __be16 length;
62 };
63
64
65 /* Section 3.2. Chunk Type Values.
66 * [Chunk Type] identifies the type of information contained in the Chunk
67 * Value field. It takes a value from 0 to 254. The value of 255 is
68 * reserved for future use as an extension field.
69 */
70 enum sctp_cid {
71 SCTP_CID_DATA = 0,
72 SCTP_CID_INIT = 1,
73 SCTP_CID_INIT_ACK = 2,
74 SCTP_CID_SACK = 3,
75 SCTP_CID_HEARTBEAT = 4,
76 SCTP_CID_HEARTBEAT_ACK = 5,
77 SCTP_CID_ABORT = 6,
78 SCTP_CID_SHUTDOWN = 7,
79 SCTP_CID_SHUTDOWN_ACK = 8,
80 SCTP_CID_ERROR = 9,
81 SCTP_CID_COOKIE_ECHO = 10,
82 SCTP_CID_COOKIE_ACK = 11,
83 SCTP_CID_ECN_ECNE = 12,
84 SCTP_CID_ECN_CWR = 13,
85 SCTP_CID_SHUTDOWN_COMPLETE = 14,
86
87 /* AUTH Extension Section 4.1 */
88 SCTP_CID_AUTH = 0x0F,
89
90 /* sctp ndata 5.1. I-DATA */
91 SCTP_CID_I_DATA = 0x40,
92
93 /* PR-SCTP Sec 3.2 */
94 SCTP_CID_FWD_TSN = 0xC0,
95
96 /* Use hex, as defined in ADDIP sec. 3.1 */
97 SCTP_CID_ASCONF = 0xC1,
98 SCTP_CID_I_FWD_TSN = 0xC2,
99 SCTP_CID_ASCONF_ACK = 0x80,
100 SCTP_CID_RECONF = 0x82,
101 SCTP_CID_PAD = 0x84,
102 }; /* enum */
103
104
105 /* Section 3.2
106 * Chunk Types are encoded such that the highest-order two bits specify
107 * the action that must be taken if the processing endpoint does not
108 * recognize the Chunk Type.
109 */
110 enum {
111 SCTP_CID_ACTION_DISCARD = 0x00,
112 SCTP_CID_ACTION_DISCARD_ERR = 0x40,
113 SCTP_CID_ACTION_SKIP = 0x80,
114 SCTP_CID_ACTION_SKIP_ERR = 0xc0,
115 };
116
117 enum { SCTP_CID_ACTION_MASK = 0xc0, };
118
119 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
120 *
121 * 3.3.7 Abort Association (ABORT) (6):
122 * The T bit is set to 0 if the sender had a TCB that it destroyed.
123 * If the sender did not have a TCB it should set this bit to 1.
124 */
125 enum { SCTP_CHUNK_FLAG_T = 0x01 };
126
127 /*
128 * Set the T bit
129 *
130 * 0 1 2 3
131 * 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
132 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
133 * | Type = 14 |Reserved |T| Length = 4 |
134 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
135 *
136 * Chunk Flags: 8 bits
137 *
138 * Reserved: 7 bits
139 * Set to 0 on transmit and ignored on receipt.
140 *
141 * T bit: 1 bit
142 * The T bit is set to 0 if the sender had a TCB that it destroyed. If
143 * the sender did NOT have a TCB it should set this bit to 1.
144 *
145 * Note: Special rules apply to this chunk for verification, please
146 * see Section 8.5.1 for details.
147 */
148
149 #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
150
151 /* RFC 2960
152 * Section 3.2.1 Optional/Variable-length Parmaeter Format.
153 */
154
155 struct sctp_paramhdr {
156 __be16 type;
157 __be16 length;
158 };
159
160 enum sctp_param {
161
162 /* RFC 2960 Section 3.3.5 */
163 SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
164 /* RFC 2960 Section 3.3.2.1 */
165 SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
166 SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
167 SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
168 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
169 SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
170 SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
171 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
172 SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
173
174 /* AUTH Extension Section 3 */
175 SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
176 SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
177 SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
178
179 /* Add-IP: Supported Extensions, Section 4.2 */
180 SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
181
182 /* PR-SCTP Sec 3.1 */
183 SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
184
185 /* Add-IP Extension. Section 3.2 */
186 SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
187 SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
188 SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
189 SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
190 SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
191 SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
192
193 /* RE-CONFIG. Section 4 */
194 SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d),
195 SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e),
196 SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f),
197 SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010),
198 SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011),
199 SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012),
200 }; /* enum */
201
202
203 /* RFC 2960 Section 3.2.1
204 * The Parameter Types are encoded such that the highest-order two bits
205 * specify the action that must be taken if the processing endpoint does
206 * not recognize the Parameter Type.
207 *
208 */
209 enum {
210 SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
211 SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
212 SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
213 SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
214 };
215
216 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
217
218 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
219
220 struct sctp_datahdr {
221 __be32 tsn;
222 __be16 stream;
223 __be16 ssn;
224 __u32 ppid;
225 /* __u8 payload[]; */
226 };
227
228 struct sctp_data_chunk {
229 struct sctp_chunkhdr chunk_hdr;
230 struct sctp_datahdr data_hdr;
231 };
232
233 struct sctp_idatahdr {
234 __be32 tsn;
235 __be16 stream;
236 __be16 reserved;
237 __be32 mid;
238 union {
239 __u32 ppid;
240 __be32 fsn;
241 };
242 __u8 payload[0];
243 };
244
245 struct sctp_idata_chunk {
246 struct sctp_chunkhdr chunk_hdr;
247 struct sctp_idatahdr data_hdr;
248 };
249
250 /* DATA Chuck Specific Flags */
251 enum {
252 SCTP_DATA_MIDDLE_FRAG = 0x00,
253 SCTP_DATA_LAST_FRAG = 0x01,
254 SCTP_DATA_FIRST_FRAG = 0x02,
255 SCTP_DATA_NOT_FRAG = 0x03,
256 SCTP_DATA_UNORDERED = 0x04,
257 SCTP_DATA_SACK_IMM = 0x08,
258 };
259 enum { SCTP_DATA_FRAG_MASK = 0x03, };
260
261
262 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
263 *
264 * This chunk is used to initiate a SCTP association between two
265 * endpoints.
266 */
267 struct sctp_inithdr {
268 __be32 init_tag;
269 __be32 a_rwnd;
270 __be16 num_outbound_streams;
271 __be16 num_inbound_streams;
272 __be32 initial_tsn;
273 /* __u8 params[]; */
274 };
275
276 struct sctp_init_chunk {
277 struct sctp_chunkhdr chunk_hdr;
278 struct sctp_inithdr init_hdr;
279 };
280
281
282 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
283 struct sctp_ipv4addr_param {
284 struct sctp_paramhdr param_hdr;
285 struct in_addr addr;
286 };
287
288 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
289 struct sctp_ipv6addr_param {
290 struct sctp_paramhdr param_hdr;
291 struct in6_addr addr;
292 };
293
294 /* Section 3.3.2.1 Cookie Preservative (9) */
295 struct sctp_cookie_preserve_param {
296 struct sctp_paramhdr param_hdr;
297 __be32 lifespan_increment;
298 };
299
300 /* Section 3.3.2.1 Host Name Address (11) */
301 struct sctp_hostname_param {
302 struct sctp_paramhdr param_hdr;
303 uint8_t hostname[];
304 };
305
306 /* Section 3.3.2.1 Supported Address Types (12) */
307 struct sctp_supported_addrs_param {
308 struct sctp_paramhdr param_hdr;
309 __be16 types[];
310 };
311
312 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
313 struct sctp_adaptation_ind_param {
314 struct sctp_paramhdr param_hdr;
315 __be32 adaptation_ind;
316 };
317
318 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
319 struct sctp_supported_ext_param {
320 struct sctp_paramhdr param_hdr;
321 __u8 chunks[];
322 };
323
324 /* AUTH Section 3.1 Random */
325 struct sctp_random_param {
326 struct sctp_paramhdr param_hdr;
327 __u8 random_val[];
328 };
329
330 /* AUTH Section 3.2 Chunk List */
331 struct sctp_chunks_param {
332 struct sctp_paramhdr param_hdr;
333 __u8 chunks[];
334 };
335
336 /* AUTH Section 3.3 HMAC Algorithm */
337 struct sctp_hmac_algo_param {
338 struct sctp_paramhdr param_hdr;
339 __be16 hmac_ids[];
340 };
341
342 /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
343 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
344 * association.
345 */
346 struct sctp_initack_chunk {
347 struct sctp_chunkhdr chunk_hdr;
348 struct sctp_inithdr init_hdr;
349 };
350
351 /* Section 3.3.3.1 State Cookie (7) */
352 struct sctp_cookie_param {
353 struct sctp_paramhdr p;
354 __u8 body[];
355 };
356
357 /* Section 3.3.3.1 Unrecognized Parameters (8) */
358 struct sctp_unrecognized_param {
359 struct sctp_paramhdr param_hdr;
360 struct sctp_paramhdr unrecognized;
361 };
362
363
364
365 /*
366 * 3.3.4 Selective Acknowledgement (SACK) (3):
367 *
368 * This chunk is sent to the peer endpoint to acknowledge received DATA
369 * chunks and to inform the peer endpoint of gaps in the received
370 * subsequences of DATA chunks as represented by their TSNs.
371 */
372
373 struct sctp_gap_ack_block {
374 __be16 start;
375 __be16 end;
376 };
377
378 union sctp_sack_variable {
379 struct sctp_gap_ack_block gab;
380 __be32 dup;
381 };
382
383 struct sctp_sackhdr {
384 __be32 cum_tsn_ack;
385 __be32 a_rwnd;
386 __be16 num_gap_ack_blocks;
387 __be16 num_dup_tsns;
388 /* union sctp_sack_variable variable[]; */
389 };
390
391 struct sctp_sack_chunk {
392 struct sctp_chunkhdr chunk_hdr;
393 struct sctp_sackhdr sack_hdr;
394 };
395
396
397 /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
398 *
399 * An endpoint should send this chunk to its peer endpoint to probe the
400 * reachability of a particular destination transport address defined in
401 * the present association.
402 */
403
404 struct sctp_heartbeathdr {
405 struct sctp_paramhdr info;
406 };
407
408 struct sctp_heartbeat_chunk {
409 struct sctp_chunkhdr chunk_hdr;
410 struct sctp_heartbeathdr hb_hdr;
411 };
412
413
414 /* PAD chunk could be bundled with heartbeat chunk to probe pmtu */
415 struct sctp_pad_chunk {
416 struct sctp_chunkhdr uh;
417 };
418
419
420 /* For the abort and shutdown ACK we must carry the init tag in the
421 * common header. Just the common header is all that is needed with a
422 * chunk descriptor.
423 */
424 struct sctp_abort_chunk {
425 struct sctp_chunkhdr uh;
426 };
427
428
429 /* For the graceful shutdown we must carry the tag (in common header)
430 * and the highest consecutive acking value.
431 */
432 struct sctp_shutdownhdr {
433 __be32 cum_tsn_ack;
434 };
435
436 struct sctp_shutdown_chunk {
437 struct sctp_chunkhdr chunk_hdr;
438 struct sctp_shutdownhdr shutdown_hdr;
439 };
440
441 /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
442
443 struct sctp_errhdr {
444 __be16 cause;
445 __be16 length;
446 /* __u8 variable[]; */
447 };
448
449 struct sctp_operr_chunk {
450 struct sctp_chunkhdr chunk_hdr;
451 struct sctp_errhdr err_hdr;
452 };
453
454 /* RFC 2960 3.3.10 - Operation Error
455 *
456 * Cause Code: 16 bits (unsigned integer)
457 *
458 * Defines the type of error conditions being reported.
459 * Cause Code
460 * Value Cause Code
461 * --------- ----------------
462 * 1 Invalid Stream Identifier
463 * 2 Missing Mandatory Parameter
464 * 3 Stale Cookie Error
465 * 4 Out of Resource
466 * 5 Unresolvable Address
467 * 6 Unrecognized Chunk Type
468 * 7 Invalid Mandatory Parameter
469 * 8 Unrecognized Parameters
470 * 9 No User Data
471 * 10 Cookie Received While Shutting Down
472 */
473 enum sctp_error {
474
475 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
476 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
477 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
478 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
479 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
480 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
481 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
482 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
483 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
484 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
485 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
486
487
488 /* SCTP Implementation Guide:
489 * 11 Restart of an association with new addresses
490 * 12 User Initiated Abort
491 * 13 Protocol Violation
492 * 14 Restart of an Association with New Encapsulation Port
493 */
494
495 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
496 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
497 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
498 SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e),
499
500 /* ADDIP Section 3.3 New Error Causes
501 *
502 * Four new Error Causes are added to the SCTP Operational Errors,
503 * primarily for use in the ASCONF-ACK chunk.
504 *
505 * Value Cause Code
506 * --------- ----------------
507 * 0x00A0 Request to Delete Last Remaining IP Address.
508 * 0x00A1 Operation Refused Due to Resource Shortage.
509 * 0x00A2 Request to Delete Source IP Address.
510 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
511 * 0x00A4 Request refused - no authorization.
512 */
513 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
514 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
515 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
516 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
517 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
518
519 /* AUTH Section 4. New Error Cause
520 *
521 * This section defines a new error cause that will be sent if an AUTH
522 * chunk is received with an unsupported HMAC identifier.
523 * illustrates the new error cause.
524 *
525 * Cause Code Error Cause Name
526 * --------------------------------------------------------------
527 * 0x0105 Unsupported HMAC Identifier
528 */
529 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
530 };
531
532
533
534 /* RFC 2960. Appendix A. Explicit Congestion Notification.
535 * Explicit Congestion Notification Echo (ECNE) (12)
536 */
537 struct sctp_ecnehdr {
538 __be32 lowest_tsn;
539 };
540
541 struct sctp_ecne_chunk {
542 struct sctp_chunkhdr chunk_hdr;
543 struct sctp_ecnehdr ence_hdr;
544 };
545
546 /* RFC 2960. Appendix A. Explicit Congestion Notification.
547 * Congestion Window Reduced (CWR) (13)
548 */
549 struct sctp_cwrhdr {
550 __be32 lowest_tsn;
551 };
552
553 /* PR-SCTP
554 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
555 *
556 * Forward Cumulative TSN chunk has the following format:
557 *
558 * 0 1 2 3
559 * 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
560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * | Type = 192 | Flags = 0x00 | Length = Variable |
562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
563 * | New Cumulative TSN |
564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
565 * | Stream-1 | Stream Sequence-1 |
566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
567 * \ /
568 * / \
569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
570 * | Stream-N | Stream Sequence-N |
571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
572 *
573 * Chunk Flags:
574 *
575 * Set to all zeros on transmit and ignored on receipt.
576 *
577 * New Cumulative TSN: 32 bit u_int
578 *
579 * This indicates the new cumulative TSN to the data receiver. Upon
580 * the reception of this value, the data receiver MUST consider
581 * any missing TSNs earlier than or equal to this value as received
582 * and stop reporting them as gaps in any subsequent SACKs.
583 *
584 * Stream-N: 16 bit u_int
585 *
586 * This field holds a stream number that was skipped by this
587 * FWD-TSN.
588 *
589 * Stream Sequence-N: 16 bit u_int
590 * This field holds the sequence number associated with the stream
591 * that was skipped. The stream sequence field holds the largest stream
592 * sequence number in this stream being skipped. The receiver of
593 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
594 * to enable delivery of any stranded TSN's that remain on the stream
595 * re-ordering queues. This field MUST NOT report TSN's corresponding
596 * to DATA chunk that are marked as unordered. For ordered DATA
597 * chunks this field MUST be filled in.
598 */
599 struct sctp_fwdtsn_skip {
600 __be16 stream;
601 __be16 ssn;
602 };
603
604 struct sctp_fwdtsn_hdr {
605 __be32 new_cum_tsn;
606 /* struct sctp_fwdtsn_skip skip[]; */
607 };
608
609 struct sctp_fwdtsn_chunk {
610 struct sctp_chunkhdr chunk_hdr;
611 struct sctp_fwdtsn_hdr fwdtsn_hdr;
612 };
613
614 struct sctp_ifwdtsn_skip {
615 __be16 stream;
616 __u8 reserved;
617 __u8 flags;
618 __be32 mid;
619 };
620
621 struct sctp_ifwdtsn_hdr {
622 __be32 new_cum_tsn;
623 /* struct sctp_ifwdtsn_skip skip[]; */
624 };
625
626 struct sctp_ifwdtsn_chunk {
627 struct sctp_chunkhdr chunk_hdr;
628 struct sctp_ifwdtsn_hdr fwdtsn_hdr;
629 };
630
631 /* ADDIP
632 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
633 *
634 * Serial Number: 32 bits (unsigned integer)
635 * This value represents a Serial Number for the ASCONF Chunk. The
636 * valid range of Serial Number is from 0 to 2^32-1.
637 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
638 *
639 * Address Parameter: 8 or 20 bytes (depending on type)
640 * The address is an address of the sender of the ASCONF chunk,
641 * the address MUST be considered part of the association by the
642 * peer endpoint. This field may be used by the receiver of the
643 * ASCONF to help in finding the association. This parameter MUST
644 * be present in every ASCONF message i.e. it is a mandatory TLV
645 * parameter.
646 *
647 * ASCONF Parameter: TLV format
648 * Each Address configuration change is represented by a TLV
649 * parameter as defined in Section 3.2. One or more requests may
650 * be present in an ASCONF Chunk.
651 *
652 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
653 *
654 * Serial Number: 32 bits (unsigned integer)
655 * This value represents the Serial Number for the received ASCONF
656 * Chunk that is acknowledged by this chunk. This value is copied
657 * from the received ASCONF Chunk.
658 *
659 * ASCONF Parameter Response: TLV format
660 * The ASCONF Parameter Response is used in the ASCONF-ACK to
661 * report status of ASCONF processing.
662 */
663 struct sctp_addip_param {
664 struct sctp_paramhdr param_hdr;
665 __be32 crr_id;
666 };
667
668 struct sctp_addiphdr {
669 __be32 serial;
670 /* __u8 params[]; */
671 };
672
673 struct sctp_addip_chunk {
674 struct sctp_chunkhdr chunk_hdr;
675 struct sctp_addiphdr addip_hdr;
676 };
677
678 /* AUTH
679 * Section 4.1 Authentication Chunk (AUTH)
680 *
681 * This chunk is used to hold the result of the HMAC calculation.
682 *
683 * 0 1 2 3
684 * 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
685 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
686 * | Type = 0x0F | Flags=0 | Length |
687 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
688 * | Shared Key Identifier | HMAC Identifier |
689 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
690 * | |
691 * \ HMAC /
692 * / \
693 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
694 *
695 * Type: 1 byte (unsigned integer)
696 * This value MUST be set to 0x0F for all AUTH-chunks.
697 *
698 * Flags: 1 byte (unsigned integer)
699 * Set to zero on transmit and ignored on receipt.
700 *
701 * Length: 2 bytes (unsigned integer)
702 * This value holds the length of the HMAC in bytes plus 8.
703 *
704 * Shared Key Identifier: 2 bytes (unsigned integer)
705 * This value describes which endpoint pair shared key is used.
706 *
707 * HMAC Identifier: 2 bytes (unsigned integer)
708 * This value describes which message digest is being used. Table 2
709 * shows the currently defined values.
710 *
711 * The following Table 2 shows the currently defined values for HMAC
712 * identifiers.
713 *
714 * +-----------------+--------------------------+
715 * | HMAC Identifier | Message Digest Algorithm |
716 * +-----------------+--------------------------+
717 * | 0 | Reserved |
718 * | 1 | SHA-1 defined in [8] |
719 * | 2 | Reserved |
720 * | 3 | SHA-256 defined in [8] |
721 * +-----------------+--------------------------+
722 *
723 *
724 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
725 * calculation.
726 */
727 struct sctp_authhdr {
728 __be16 shkey_id;
729 __be16 hmac_id;
730 /* __u8 hmac[]; */
731 };
732
733 struct sctp_auth_chunk {
734 struct sctp_chunkhdr chunk_hdr;
735 struct sctp_authhdr auth_hdr;
736 };
737
738 struct sctp_infox {
739 struct sctp_info *sctpinfo;
740 struct sctp_association *asoc;
741 };
742
743 struct sctp_reconf_chunk {
744 struct sctp_chunkhdr chunk_hdr;
745 /* __u8 params[]; */
746 };
747
748 struct sctp_strreset_outreq {
749 struct sctp_paramhdr param_hdr;
750 __be32 request_seq;
751 __be32 response_seq;
752 __be32 send_reset_at_tsn;
753 __be16 list_of_streams[];
754 };
755
756 struct sctp_strreset_inreq {
757 struct sctp_paramhdr param_hdr;
758 __be32 request_seq;
759 __be16 list_of_streams[];
760 };
761
762 struct sctp_strreset_tsnreq {
763 struct sctp_paramhdr param_hdr;
764 __be32 request_seq;
765 };
766
767 struct sctp_strreset_addstrm {
768 struct sctp_paramhdr param_hdr;
769 __be32 request_seq;
770 __be16 number_of_streams;
771 __be16 reserved;
772 };
773
774 enum {
775 SCTP_STRRESET_NOTHING_TO_DO = 0x00,
776 SCTP_STRRESET_PERFORMED = 0x01,
777 SCTP_STRRESET_DENIED = 0x02,
778 SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
779 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
780 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
781 SCTP_STRRESET_IN_PROGRESS = 0x06,
782 };
783
784 struct sctp_strreset_resp {
785 struct sctp_paramhdr param_hdr;
786 __be32 response_seq;
787 __be32 result;
788 };
789
790 struct sctp_strreset_resptsn {
791 struct sctp_paramhdr param_hdr;
792 __be32 response_seq;
793 __be32 result;
794 __be32 senders_next_tsn;
795 __be32 receivers_next_tsn;
796 };
797
798 enum {
799 SCTP_DSCP_SET_MASK = 0x1,
800 SCTP_DSCP_VAL_MASK = 0xfc,
801 SCTP_FLOWLABEL_SET_MASK = 0x100000,
802 SCTP_FLOWLABEL_VAL_MASK = 0xfffff
803 };
804
805 /* UDP Encapsulation
806 * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4
807 *
808 * The error cause indicating an "Restart of an Association with
809 * New Encapsulation Port"
810 *
811 * 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
812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
813 * | Cause Code = 14 | Cause Length = 8 |
814 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
815 * | Current Encapsulation Port | New Encapsulation Port |
816 * +-------------------------------+-------------------------------+
817 */
818 struct sctp_new_encap_port_hdr {
819 __be16 cur_port;
820 __be16 new_port;
821 };
822
823 /* Round an int up to the next multiple of 4. */
824 #define SCTP_PAD4(s) (((s)+3)&~3)
825 /* Truncate to the previous multiple of 4. */
826 #define SCTP_TRUNC4(s) ((s)&~3)
827
828 #endif /* __LINUX_SCTP_H__ */
829