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 */
45struct sctphdr {
46 __be16 source;
47 __be16 dest;
48 __be32 vtag;
49 __le32 checksum;
50};
51
52static 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. */
58struct 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 */
70enum 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 */
110enum {
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
117enum { 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 */
125enum { 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
155struct sctp_paramhdr {
156 __be16 type;
157 __be16 length;
158};
159
160enum 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 */
209enum {
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
216enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
217
218/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
219
220struct sctp_datahdr {
221 __be32 tsn;
222 __be16 stream;
223 __be16 ssn;
224 __u32 ppid;
225};
226
227struct sctp_data_chunk {
228 struct sctp_chunkhdr chunk_hdr;
229 struct sctp_datahdr data_hdr;
230};
231
232struct sctp_idatahdr {
233 __be32 tsn;
234 __be16 stream;
235 __be16 reserved;
236 __be32 mid;
237 union {
238 __u32 ppid;
239 __be32 fsn;
240 };
241};
242
243struct sctp_idata_chunk {
244 struct sctp_chunkhdr chunk_hdr;
245 struct sctp_idatahdr data_hdr;
246};
247
248/* DATA Chuck Specific Flags */
249enum {
250 SCTP_DATA_MIDDLE_FRAG = 0x00,
251 SCTP_DATA_LAST_FRAG = 0x01,
252 SCTP_DATA_FIRST_FRAG = 0x02,
253 SCTP_DATA_NOT_FRAG = 0x03,
254 SCTP_DATA_UNORDERED = 0x04,
255 SCTP_DATA_SACK_IMM = 0x08,
256};
257enum { SCTP_DATA_FRAG_MASK = 0x03, };
258
259
260/* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
261 *
262 * This chunk is used to initiate a SCTP association between two
263 * endpoints.
264 */
265struct sctp_inithdr {
266 __be32 init_tag;
267 __be32 a_rwnd;
268 __be16 num_outbound_streams;
269 __be16 num_inbound_streams;
270 __be32 initial_tsn;
271 /* __u8 params[]; */
272};
273
274struct sctp_init_chunk {
275 struct sctp_chunkhdr chunk_hdr;
276 struct sctp_inithdr init_hdr;
277};
278
279
280/* Section 3.3.2.1. IPv4 Address Parameter (5) */
281struct sctp_ipv4addr_param {
282 struct sctp_paramhdr param_hdr;
283 struct in_addr addr;
284};
285
286/* Section 3.3.2.1. IPv6 Address Parameter (6) */
287struct sctp_ipv6addr_param {
288 struct sctp_paramhdr param_hdr;
289 struct in6_addr addr;
290};
291
292/* Section 3.3.2.1 Cookie Preservative (9) */
293struct sctp_cookie_preserve_param {
294 struct sctp_paramhdr param_hdr;
295 __be32 lifespan_increment;
296};
297
298/* Section 3.3.2.1 Host Name Address (11) */
299struct sctp_hostname_param {
300 struct sctp_paramhdr param_hdr;
301 uint8_t hostname[];
302};
303
304/* Section 3.3.2.1 Supported Address Types (12) */
305struct sctp_supported_addrs_param {
306 struct sctp_paramhdr param_hdr;
307 __be16 types[];
308};
309
310/* ADDIP Section 3.2.6 Adaptation Layer Indication */
311struct sctp_adaptation_ind_param {
312 struct sctp_paramhdr param_hdr;
313 __be32 adaptation_ind;
314};
315
316/* ADDIP Section 4.2.7 Supported Extensions Parameter */
317struct sctp_supported_ext_param {
318 struct sctp_paramhdr param_hdr;
319 __u8 chunks[];
320};
321
322/* AUTH Section 3.1 Random */
323struct sctp_random_param {
324 struct sctp_paramhdr param_hdr;
325 __u8 random_val[];
326};
327
328/* AUTH Section 3.2 Chunk List */
329struct sctp_chunks_param {
330 struct sctp_paramhdr param_hdr;
331 __u8 chunks[];
332};
333
334/* AUTH Section 3.3 HMAC Algorithm */
335struct sctp_hmac_algo_param {
336 struct sctp_paramhdr param_hdr;
337 __be16 hmac_ids[];
338};
339
340/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
341 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
342 * association.
343 */
344struct sctp_initack_chunk {
345 struct sctp_chunkhdr chunk_hdr;
346 struct sctp_inithdr init_hdr;
347};
348
349/* Section 3.3.3.1 State Cookie (7) */
350struct sctp_cookie_param {
351 struct sctp_paramhdr p;
352 __u8 body[];
353};
354
355/* Section 3.3.3.1 Unrecognized Parameters (8) */
356struct sctp_unrecognized_param {
357 struct sctp_paramhdr param_hdr;
358 struct sctp_paramhdr unrecognized;
359};
360
361
362
363/*
364 * 3.3.4 Selective Acknowledgement (SACK) (3):
365 *
366 * This chunk is sent to the peer endpoint to acknowledge received DATA
367 * chunks and to inform the peer endpoint of gaps in the received
368 * subsequences of DATA chunks as represented by their TSNs.
369 */
370
371struct sctp_gap_ack_block {
372 __be16 start;
373 __be16 end;
374};
375
376union sctp_sack_variable {
377 struct sctp_gap_ack_block gab;
378 __be32 dup;
379};
380
381struct sctp_sackhdr {
382 __be32 cum_tsn_ack;
383 __be32 a_rwnd;
384 __be16 num_gap_ack_blocks;
385 __be16 num_dup_tsns;
386 /* union sctp_sack_variable variable[]; */
387};
388
389struct sctp_sack_chunk {
390 struct sctp_chunkhdr chunk_hdr;
391 struct sctp_sackhdr sack_hdr;
392};
393
394
395/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
396 *
397 * An endpoint should send this chunk to its peer endpoint to probe the
398 * reachability of a particular destination transport address defined in
399 * the present association.
400 */
401
402struct sctp_heartbeathdr {
403 struct sctp_paramhdr info;
404};
405
406struct sctp_heartbeat_chunk {
407 struct sctp_chunkhdr chunk_hdr;
408 struct sctp_heartbeathdr hb_hdr;
409};
410
411
412/* PAD chunk could be bundled with heartbeat chunk to probe pmtu */
413struct sctp_pad_chunk {
414 struct sctp_chunkhdr uh;
415};
416
417
418/* For the abort and shutdown ACK we must carry the init tag in the
419 * common header. Just the common header is all that is needed with a
420 * chunk descriptor.
421 */
422struct sctp_abort_chunk {
423 struct sctp_chunkhdr uh;
424};
425
426
427/* For the graceful shutdown we must carry the tag (in common header)
428 * and the highest consecutive acking value.
429 */
430struct sctp_shutdownhdr {
431 __be32 cum_tsn_ack;
432};
433
434struct sctp_shutdown_chunk {
435 struct sctp_chunkhdr chunk_hdr;
436 struct sctp_shutdownhdr shutdown_hdr;
437};
438
439/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
440
441struct sctp_errhdr {
442 __be16 cause;
443 __be16 length;
444 /* __u8 variable[]; */
445};
446
447struct sctp_operr_chunk {
448 struct sctp_chunkhdr chunk_hdr;
449 struct sctp_errhdr err_hdr;
450};
451
452/* RFC 2960 3.3.10 - Operation Error
453 *
454 * Cause Code: 16 bits (unsigned integer)
455 *
456 * Defines the type of error conditions being reported.
457 * Cause Code
458 * Value Cause Code
459 * --------- ----------------
460 * 1 Invalid Stream Identifier
461 * 2 Missing Mandatory Parameter
462 * 3 Stale Cookie Error
463 * 4 Out of Resource
464 * 5 Unresolvable Address
465 * 6 Unrecognized Chunk Type
466 * 7 Invalid Mandatory Parameter
467 * 8 Unrecognized Parameters
468 * 9 No User Data
469 * 10 Cookie Received While Shutting Down
470 */
471enum sctp_error {
472
473 SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
474 SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
475 SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
476 SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
477 SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
478 SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
479 SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
480 SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
481 SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
482 SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
483 SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
484
485
486 /* SCTP Implementation Guide:
487 * 11 Restart of an association with new addresses
488 * 12 User Initiated Abort
489 * 13 Protocol Violation
490 * 14 Restart of an Association with New Encapsulation Port
491 */
492
493 SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
494 SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
495 SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
496 SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e),
497
498 /* ADDIP Section 3.3 New Error Causes
499 *
500 * Four new Error Causes are added to the SCTP Operational Errors,
501 * primarily for use in the ASCONF-ACK chunk.
502 *
503 * Value Cause Code
504 * --------- ----------------
505 * 0x00A0 Request to Delete Last Remaining IP Address.
506 * 0x00A1 Operation Refused Due to Resource Shortage.
507 * 0x00A2 Request to Delete Source IP Address.
508 * 0x00A3 Association Aborted due to illegal ASCONF-ACK
509 * 0x00A4 Request refused - no authorization.
510 */
511 SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
512 SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
513 SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
514 SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
515 SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
516
517 /* AUTH Section 4. New Error Cause
518 *
519 * This section defines a new error cause that will be sent if an AUTH
520 * chunk is received with an unsupported HMAC identifier.
521 * illustrates the new error cause.
522 *
523 * Cause Code Error Cause Name
524 * --------------------------------------------------------------
525 * 0x0105 Unsupported HMAC Identifier
526 */
527 SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
528};
529
530
531
532/* RFC 2960. Appendix A. Explicit Congestion Notification.
533 * Explicit Congestion Notification Echo (ECNE) (12)
534 */
535struct sctp_ecnehdr {
536 __be32 lowest_tsn;
537};
538
539struct sctp_ecne_chunk {
540 struct sctp_chunkhdr chunk_hdr;
541 struct sctp_ecnehdr ence_hdr;
542};
543
544/* RFC 2960. Appendix A. Explicit Congestion Notification.
545 * Congestion Window Reduced (CWR) (13)
546 */
547struct sctp_cwrhdr {
548 __be32 lowest_tsn;
549};
550
551/* PR-SCTP
552 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
553 *
554 * Forward Cumulative TSN chunk has the following format:
555 *
556 * 0 1 2 3
557 * 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
558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559 * | Type = 192 | Flags = 0x00 | Length = Variable |
560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * | New Cumulative TSN |
562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
563 * | Stream-1 | Stream Sequence-1 |
564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
565 * \ /
566 * / \
567 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
568 * | Stream-N | Stream Sequence-N |
569 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
570 *
571 * Chunk Flags:
572 *
573 * Set to all zeros on transmit and ignored on receipt.
574 *
575 * New Cumulative TSN: 32 bit u_int
576 *
577 * This indicates the new cumulative TSN to the data receiver. Upon
578 * the reception of this value, the data receiver MUST consider
579 * any missing TSNs earlier than or equal to this value as received
580 * and stop reporting them as gaps in any subsequent SACKs.
581 *
582 * Stream-N: 16 bit u_int
583 *
584 * This field holds a stream number that was skipped by this
585 * FWD-TSN.
586 *
587 * Stream Sequence-N: 16 bit u_int
588 * This field holds the sequence number associated with the stream
589 * that was skipped. The stream sequence field holds the largest stream
590 * sequence number in this stream being skipped. The receiver of
591 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
592 * to enable delivery of any stranded TSN's that remain on the stream
593 * re-ordering queues. This field MUST NOT report TSN's corresponding
594 * to DATA chunk that are marked as unordered. For ordered DATA
595 * chunks this field MUST be filled in.
596 */
597struct sctp_fwdtsn_skip {
598 __be16 stream;
599 __be16 ssn;
600};
601
602struct sctp_fwdtsn_hdr {
603 __be32 new_cum_tsn;
604 /* struct sctp_fwdtsn_skip skip[]; */
605};
606
607struct sctp_fwdtsn_chunk {
608 struct sctp_chunkhdr chunk_hdr;
609 struct sctp_fwdtsn_hdr fwdtsn_hdr;
610};
611
612struct sctp_ifwdtsn_skip {
613 __be16 stream;
614 __u8 reserved;
615 __u8 flags;
616 __be32 mid;
617};
618
619struct sctp_ifwdtsn_hdr {
620 __be32 new_cum_tsn;
621 /* struct sctp_ifwdtsn_skip skip[]; */
622};
623
624struct sctp_ifwdtsn_chunk {
625 struct sctp_chunkhdr chunk_hdr;
626 struct sctp_ifwdtsn_hdr fwdtsn_hdr;
627};
628
629/* ADDIP
630 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
631 *
632 * Serial Number: 32 bits (unsigned integer)
633 * This value represents a Serial Number for the ASCONF Chunk. The
634 * valid range of Serial Number is from 0 to 2^32-1.
635 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
636 *
637 * Address Parameter: 8 or 20 bytes (depending on type)
638 * The address is an address of the sender of the ASCONF chunk,
639 * the address MUST be considered part of the association by the
640 * peer endpoint. This field may be used by the receiver of the
641 * ASCONF to help in finding the association. This parameter MUST
642 * be present in every ASCONF message i.e. it is a mandatory TLV
643 * parameter.
644 *
645 * ASCONF Parameter: TLV format
646 * Each Address configuration change is represented by a TLV
647 * parameter as defined in Section 3.2. One or more requests may
648 * be present in an ASCONF Chunk.
649 *
650 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
651 *
652 * Serial Number: 32 bits (unsigned integer)
653 * This value represents the Serial Number for the received ASCONF
654 * Chunk that is acknowledged by this chunk. This value is copied
655 * from the received ASCONF Chunk.
656 *
657 * ASCONF Parameter Response: TLV format
658 * The ASCONF Parameter Response is used in the ASCONF-ACK to
659 * report status of ASCONF processing.
660 */
661struct sctp_addip_param {
662 struct sctp_paramhdr param_hdr;
663 __be32 crr_id;
664};
665
666struct sctp_addiphdr {
667 __be32 serial;
668 /* __u8 params[]; */
669};
670
671struct sctp_addip_chunk {
672 struct sctp_chunkhdr chunk_hdr;
673 struct sctp_addiphdr addip_hdr;
674};
675
676/* AUTH
677 * Section 4.1 Authentication Chunk (AUTH)
678 *
679 * This chunk is used to hold the result of the HMAC calculation.
680 *
681 * 0 1 2 3
682 * 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
683 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
684 * | Type = 0x0F | Flags=0 | Length |
685 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
686 * | Shared Key Identifier | HMAC Identifier |
687 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
688 * | |
689 * \ HMAC /
690 * / \
691 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
692 *
693 * Type: 1 byte (unsigned integer)
694 * This value MUST be set to 0x0F for all AUTH-chunks.
695 *
696 * Flags: 1 byte (unsigned integer)
697 * Set to zero on transmit and ignored on receipt.
698 *
699 * Length: 2 bytes (unsigned integer)
700 * This value holds the length of the HMAC in bytes plus 8.
701 *
702 * Shared Key Identifier: 2 bytes (unsigned integer)
703 * This value describes which endpoint pair shared key is used.
704 *
705 * HMAC Identifier: 2 bytes (unsigned integer)
706 * This value describes which message digest is being used. Table 2
707 * shows the currently defined values.
708 *
709 * The following Table 2 shows the currently defined values for HMAC
710 * identifiers.
711 *
712 * +-----------------+--------------------------+
713 * | HMAC Identifier | Message Digest Algorithm |
714 * +-----------------+--------------------------+
715 * | 0 | Reserved |
716 * | 1 | SHA-1 defined in [8] |
717 * | 2 | Reserved |
718 * | 3 | SHA-256 defined in [8] |
719 * +-----------------+--------------------------+
720 *
721 *
722 * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
723 * calculation.
724 */
725struct sctp_authhdr {
726 __be16 shkey_id;
727 __be16 hmac_id;
728 /* __u8 hmac[]; */
729};
730
731struct sctp_auth_chunk {
732 struct sctp_chunkhdr chunk_hdr;
733 struct sctp_authhdr auth_hdr;
734};
735
736struct sctp_infox {
737 struct sctp_info *sctpinfo;
738 struct sctp_association *asoc;
739};
740
741struct sctp_reconf_chunk {
742 struct sctp_chunkhdr chunk_hdr;
743 /* __u8 params[]; */
744};
745
746struct sctp_strreset_outreq {
747 struct sctp_paramhdr param_hdr;
748 __be32 request_seq;
749 __be32 response_seq;
750 __be32 send_reset_at_tsn;
751 __be16 list_of_streams[];
752};
753
754struct sctp_strreset_inreq {
755 struct sctp_paramhdr param_hdr;
756 __be32 request_seq;
757 __be16 list_of_streams[];
758};
759
760struct sctp_strreset_tsnreq {
761 struct sctp_paramhdr param_hdr;
762 __be32 request_seq;
763};
764
765struct sctp_strreset_addstrm {
766 struct sctp_paramhdr param_hdr;
767 __be32 request_seq;
768 __be16 number_of_streams;
769 __be16 reserved;
770};
771
772enum {
773 SCTP_STRRESET_NOTHING_TO_DO = 0x00,
774 SCTP_STRRESET_PERFORMED = 0x01,
775 SCTP_STRRESET_DENIED = 0x02,
776 SCTP_STRRESET_ERR_WRONG_SSN = 0x03,
777 SCTP_STRRESET_ERR_IN_PROGRESS = 0x04,
778 SCTP_STRRESET_ERR_BAD_SEQNO = 0x05,
779 SCTP_STRRESET_IN_PROGRESS = 0x06,
780};
781
782struct sctp_strreset_resp {
783 struct sctp_paramhdr param_hdr;
784 __be32 response_seq;
785 __be32 result;
786};
787
788struct sctp_strreset_resptsn {
789 struct sctp_paramhdr param_hdr;
790 __be32 response_seq;
791 __be32 result;
792 __be32 senders_next_tsn;
793 __be32 receivers_next_tsn;
794};
795
796enum {
797 SCTP_DSCP_SET_MASK = 0x1,
798 SCTP_DSCP_VAL_MASK = 0xfc,
799 SCTP_FLOWLABEL_SET_MASK = 0x100000,
800 SCTP_FLOWLABEL_VAL_MASK = 0xfffff
801};
802
803/* UDP Encapsulation
804 * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4
805 *
806 * The error cause indicating an "Restart of an Association with
807 * New Encapsulation Port"
808 *
809 * 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
810 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
811 * | Cause Code = 14 | Cause Length = 8 |
812 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
813 * | Current Encapsulation Port | New Encapsulation Port |
814 * +-------------------------------+-------------------------------+
815 */
816struct sctp_new_encap_port_hdr {
817 __be16 cur_port;
818 __be16 new_port;
819};
820
821/* Round an int up to the next multiple of 4. */
822#define SCTP_PAD4(s) (((s)+3)&~3)
823/* Truncate to the previous multiple of 4. */
824#define SCTP_TRUNC4(s) ((s)&~3)
825
826#endif /* __LINUX_SCTP_H__ */
827