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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 * The SCTP reference 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 * The SCTP reference implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA.
29 *
30 * Please send any bug reports or fixes you make to the
31 * email address(es):
32 * lksctp developers <[email protected]>
33 *
34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp
36 *
37 * Written or modified by:
38 * La Monte H.P. Yarroll <[email protected]>
39 * Karl Knutson <[email protected]>
40 * Jon Grimm <[email protected]>
41 * Xingang Guo <[email protected]>
42 * [email protected]
43 * [email protected]
44 * [email protected]
45 * Sridhar Samudrala <[email protected]>
46 * Kevin Gao <[email protected]>
47 *
48 * Any bugs reported given to us we will try to fix... any fixes shared will
49 * be incorporated into the next SCTP release.
50 */
51#ifndef __LINUX_SCTP_H__
52#define __LINUX_SCTP_H__
53
54#include <linux/in.h> /* We need in_addr. */
55#include <linux/in6.h> /* We need in6_addr. */
56
57
58/* Section 3.1. SCTP Common Header Format */
59typedef struct sctphdr {
60 __u16 source;
61 __u16 dest;
62 __u32 vtag;
63 __u32 checksum;
64} __attribute__((packed)) sctp_sctphdr_t;
65
66/* Section 3.2. Chunk Field Descriptions. */
67typedef struct sctp_chunkhdr {
68 __u8 type;
69 __u8 flags;
70 __u16 length;
71} __attribute__((packed)) sctp_chunkhdr_t;
72
73
74/* Section 3.2. Chunk Type Values.
75 * [Chunk Type] identifies the type of information contained in the Chunk
76 * Value field. It takes a value from 0 to 254. The value of 255 is
77 * reserved for future use as an extension field.
78 */
79typedef enum {
80 SCTP_CID_DATA = 0,
81 SCTP_CID_INIT = 1,
82 SCTP_CID_INIT_ACK = 2,
83 SCTP_CID_SACK = 3,
84 SCTP_CID_HEARTBEAT = 4,
85 SCTP_CID_HEARTBEAT_ACK = 5,
86 SCTP_CID_ABORT = 6,
87 SCTP_CID_SHUTDOWN = 7,
88 SCTP_CID_SHUTDOWN_ACK = 8,
89 SCTP_CID_ERROR = 9,
90 SCTP_CID_COOKIE_ECHO = 10,
91 SCTP_CID_COOKIE_ACK = 11,
92 SCTP_CID_ECN_ECNE = 12,
93 SCTP_CID_ECN_CWR = 13,
94 SCTP_CID_SHUTDOWN_COMPLETE = 14,
95
96 /* PR-SCTP Sec 3.2 */
97 SCTP_CID_FWD_TSN = 0xC0,
98
99 /* Use hex, as defined in ADDIP sec. 3.1 */
100 SCTP_CID_ASCONF = 0xC1,
101 SCTP_CID_ASCONF_ACK = 0x80,
102} sctp_cid_t; /* 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 */
110typedef 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} sctp_cid_action_t;
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
155typedef struct sctp_paramhdr {
156 __u16 type;
157 __u16 length;
158} __attribute__((packed)) sctp_paramhdr_t;
159
160typedef enum {
161
162 /* RFC 2960 Section 3.3.5 */
163 SCTP_PARAM_HEARTBEAT_INFO = __constant_htons(1),
164 /* RFC 2960 Section 3.3.2.1 */
165 SCTP_PARAM_IPV4_ADDRESS = __constant_htons(5),
166 SCTP_PARAM_IPV6_ADDRESS = __constant_htons(6),
167 SCTP_PARAM_STATE_COOKIE = __constant_htons(7),
168 SCTP_PARAM_UNRECOGNIZED_PARAMETERS = __constant_htons(8),
169 SCTP_PARAM_COOKIE_PRESERVATIVE = __constant_htons(9),
170 SCTP_PARAM_HOST_NAME_ADDRESS = __constant_htons(11),
171 SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = __constant_htons(12),
172 SCTP_PARAM_ECN_CAPABLE = __constant_htons(0x8000),
173
174 /* PR-SCTP Sec 3.1 */
175 SCTP_PARAM_FWD_TSN_SUPPORT = __constant_htons(0xc000),
176
177 /* Add-IP Extension. Section 3.2 */
178 SCTP_PARAM_ADD_IP = __constant_htons(0xc001),
179 SCTP_PARAM_DEL_IP = __constant_htons(0xc002),
180 SCTP_PARAM_ERR_CAUSE = __constant_htons(0xc003),
181 SCTP_PARAM_SET_PRIMARY = __constant_htons(0xc004),
182 SCTP_PARAM_SUCCESS_REPORT = __constant_htons(0xc005),
183 SCTP_PARAM_ADAPTION_LAYER_IND = __constant_htons(0xc006),
184
185} sctp_param_t; /* enum */
186
187
188/* RFC 2960 Section 3.2.1
189 * The Parameter Types are encoded such that the highest-order two bits
190 * specify the action that must be taken if the processing endpoint does
191 * not recognize the Parameter Type.
192 *
193 */
194typedef enum {
195 SCTP_PARAM_ACTION_DISCARD = __constant_htons(0x0000),
196 SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000),
197 SCTP_PARAM_ACTION_SKIP = __constant_htons(0x8000),
198 SCTP_PARAM_ACTION_SKIP_ERR = __constant_htons(0xc000),
199} sctp_param_action_t;
200
201enum { SCTP_PARAM_ACTION_MASK = __constant_htons(0xc000), };
202
203/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
204
205typedef struct sctp_datahdr {
206 __u32 tsn;
207 __u16 stream;
208 __u16 ssn;
209 __u32 ppid;
210 __u8 payload[0];
211} __attribute__((packed)) sctp_datahdr_t;
212
213typedef struct sctp_data_chunk {
214 sctp_chunkhdr_t chunk_hdr;
215 sctp_datahdr_t data_hdr;
216} __attribute__((packed)) sctp_data_chunk_t;
217
218/* DATA Chuck Specific Flags */
219enum {
220 SCTP_DATA_MIDDLE_FRAG = 0x00,
221 SCTP_DATA_LAST_FRAG = 0x01,
222 SCTP_DATA_FIRST_FRAG = 0x02,
223 SCTP_DATA_NOT_FRAG = 0x03,
224 SCTP_DATA_UNORDERED = 0x04,
225};
226enum { SCTP_DATA_FRAG_MASK = 0x03, };
227
228
229/* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
230 *
231 * This chunk is used to initiate a SCTP association between two
232 * endpoints.
233 */
234typedef struct sctp_inithdr {
235 __u32 init_tag;
236 __u32 a_rwnd;
237 __u16 num_outbound_streams;
238 __u16 num_inbound_streams;
239 __u32 initial_tsn;
240 __u8 params[0];
241} __attribute__((packed)) sctp_inithdr_t;
242
243typedef struct sctp_init_chunk {
244 sctp_chunkhdr_t chunk_hdr;
245 sctp_inithdr_t init_hdr;
246} __attribute__((packed)) sctp_init_chunk_t;
247
248
249/* Section 3.3.2.1. IPv4 Address Parameter (5) */
250typedef struct sctp_ipv4addr_param {
251 sctp_paramhdr_t param_hdr;
252 struct in_addr addr;
253} __attribute__((packed)) sctp_ipv4addr_param_t;
254
255/* Section 3.3.2.1. IPv6 Address Parameter (6) */
256typedef struct sctp_ipv6addr_param {
257 sctp_paramhdr_t param_hdr;
258 struct in6_addr addr;
259} __attribute__((packed)) sctp_ipv6addr_param_t;
260
261/* Section 3.3.2.1 Cookie Preservative (9) */
262typedef struct sctp_cookie_preserve_param {
263 sctp_paramhdr_t param_hdr;
264 uint32_t lifespan_increment;
265} __attribute__((packed)) sctp_cookie_preserve_param_t;
266
267/* Section 3.3.2.1 Host Name Address (11) */
268typedef struct sctp_hostname_param {
269 sctp_paramhdr_t param_hdr;
270 uint8_t hostname[0];
271} __attribute__((packed)) sctp_hostname_param_t;
272
273/* Section 3.3.2.1 Supported Address Types (12) */
274typedef struct sctp_supported_addrs_param {
275 sctp_paramhdr_t param_hdr;
276 uint16_t types[0];
277} __attribute__((packed)) sctp_supported_addrs_param_t;
278
279/* Appendix A. ECN Capable (32768) */
280typedef struct sctp_ecn_capable_param {
281 sctp_paramhdr_t param_hdr;
282} __attribute__((packed)) sctp_ecn_capable_param_t;
283
284/* ADDIP Section 3.2.6 Adaption Layer Indication */
285typedef struct sctp_adaption_ind_param {
286 struct sctp_paramhdr param_hdr;
287 __u32 adaption_ind;
288} __attribute__((packed)) sctp_adaption_ind_param_t;
289
290/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
291 * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
292 * association.
293 */
294typedef sctp_init_chunk_t sctp_initack_chunk_t;
295
296/* Section 3.3.3.1 State Cookie (7) */
297typedef struct sctp_cookie_param {
298 sctp_paramhdr_t p;
299 __u8 body[0];
300} __attribute__((packed)) sctp_cookie_param_t;
301
302/* Section 3.3.3.1 Unrecognized Parameters (8) */
303typedef struct sctp_unrecognized_param {
304 sctp_paramhdr_t param_hdr;
305 sctp_paramhdr_t unrecognized;
306} __attribute__((packed)) sctp_unrecognized_param_t;
307
308
309
310/*
311 * 3.3.4 Selective Acknowledgement (SACK) (3):
312 *
313 * This chunk is sent to the peer endpoint to acknowledge received DATA
314 * chunks and to inform the peer endpoint of gaps in the received
315 * subsequences of DATA chunks as represented by their TSNs.
316 */
317
318typedef struct sctp_gap_ack_block {
319 __u16 start;
320 __u16 end;
321} __attribute__((packed)) sctp_gap_ack_block_t;
322
323typedef uint32_t sctp_dup_tsn_t;
324
325typedef union {
326 sctp_gap_ack_block_t gab;
327 sctp_dup_tsn_t dup;
328} sctp_sack_variable_t;
329
330typedef struct sctp_sackhdr {
331 __u32 cum_tsn_ack;
332 __u32 a_rwnd;
333 __u16 num_gap_ack_blocks;
334 __u16 num_dup_tsns;
335 sctp_sack_variable_t variable[0];
336} __attribute__((packed)) sctp_sackhdr_t;
337
338typedef struct sctp_sack_chunk {
339 sctp_chunkhdr_t chunk_hdr;
340 sctp_sackhdr_t sack_hdr;
341} __attribute__((packed)) sctp_sack_chunk_t;
342
343
344/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
345 *
346 * An endpoint should send this chunk to its peer endpoint to probe the
347 * reachability of a particular destination transport address defined in
348 * the present association.
349 */
350
351typedef struct sctp_heartbeathdr {
352 sctp_paramhdr_t info;
353} __attribute__((packed)) sctp_heartbeathdr_t;
354
355typedef struct sctp_heartbeat_chunk {
356 sctp_chunkhdr_t chunk_hdr;
357 sctp_heartbeathdr_t hb_hdr;
358} __attribute__((packed)) sctp_heartbeat_chunk_t;
359
360
361/* For the abort and shutdown ACK we must carry the init tag in the
362 * common header. Just the common header is all that is needed with a
363 * chunk descriptor.
364 */
365typedef struct sctp_abort_chunk {
366 sctp_chunkhdr_t uh;
367} __attribute__((packed)) sctp_abort_chunk_t;
368
369
370/* For the graceful shutdown we must carry the tag (in common header)
371 * and the highest consecutive acking value.
372 */
373typedef struct sctp_shutdownhdr {
374 __u32 cum_tsn_ack;
375} __attribute__((packed)) sctp_shutdownhdr_t;
376
377struct sctp_shutdown_chunk_t {
378 sctp_chunkhdr_t chunk_hdr;
379 sctp_shutdownhdr_t shutdown_hdr;
380} __attribute__ ((packed));
381
382/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
383
384typedef struct sctp_errhdr {
385 __u16 cause;
386 __u16 length;
387 __u8 variable[0];
388} __attribute__((packed)) sctp_errhdr_t;
389
390typedef struct sctp_operr_chunk {
391 sctp_chunkhdr_t chunk_hdr;
392 sctp_errhdr_t err_hdr;
393} __attribute__((packed)) sctp_operr_chunk_t;
394
395/* RFC 2960 3.3.10 - Operation Error
396 *
397 * Cause Code: 16 bits (unsigned integer)
398 *
399 * Defines the type of error conditions being reported.
400 * Cause Code
401 * Value Cause Code
402 * --------- ----------------
403 * 1 Invalid Stream Identifier
404 * 2 Missing Mandatory Parameter
405 * 3 Stale Cookie Error
406 * 4 Out of Resource
407 * 5 Unresolvable Address
408 * 6 Unrecognized Chunk Type
409 * 7 Invalid Mandatory Parameter
410 * 8 Unrecognized Parameters
411 * 9 No User Data
412 * 10 Cookie Received While Shutting Down
413 */
414typedef enum {
415
416 SCTP_ERROR_NO_ERROR = __constant_htons(0x00),
417 SCTP_ERROR_INV_STRM = __constant_htons(0x01),
418 SCTP_ERROR_MISS_PARAM = __constant_htons(0x02),
419 SCTP_ERROR_STALE_COOKIE = __constant_htons(0x03),
420 SCTP_ERROR_NO_RESOURCE = __constant_htons(0x04),
421 SCTP_ERROR_DNS_FAILED = __constant_htons(0x05),
422 SCTP_ERROR_UNKNOWN_CHUNK = __constant_htons(0x06),
423 SCTP_ERROR_INV_PARAM = __constant_htons(0x07),
424 SCTP_ERROR_UNKNOWN_PARAM = __constant_htons(0x08),
425 SCTP_ERROR_NO_DATA = __constant_htons(0x09),
426 SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a),
427
428
429 /* SCTP Implementation Guide:
430 * 11 Restart of an association with new addresses
431 * 12 User Initiated Abort
432 * 13 Protocol Violation
433 */
434
435 SCTP_ERROR_RESTART = __constant_htons(0x0b),
436 SCTP_ERROR_USER_ABORT = __constant_htons(0x0c),
437 SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d),
438
439 /* ADDIP Section 3.3 New Error Causes
440 *
441 * Four new Error Causes are added to the SCTP Operational Errors,
442 * primarily for use in the ASCONF-ACK chunk.
443 *
444 * Value Cause Code
445 * --------- ----------------
446 * 0x0100 Request to Delete Last Remaining IP Address.
447 * 0x0101 Operation Refused Due to Resource Shortage.
448 * 0x0102 Request to Delete Source IP Address.
449 * 0x0103 Association Aborted due to illegal ASCONF-ACK
450 * 0x0104 Request refused - no authorization.
451 */
452 SCTP_ERROR_DEL_LAST_IP = __constant_htons(0x0100),
453 SCTP_ERROR_RSRC_LOW = __constant_htons(0x0101),
454 SCTP_ERROR_DEL_SRC_IP = __constant_htons(0x0102),
455 SCTP_ERROR_ASCONF_ACK = __constant_htons(0x0103),
456 SCTP_ERROR_REQ_REFUSED = __constant_htons(0x0104)
457} sctp_error_t;
458
459
460
461/* RFC 2960. Appendix A. Explicit Congestion Notification.
462 * Explicit Congestion Notification Echo (ECNE) (12)
463 */
464typedef struct sctp_ecnehdr {
465 __u32 lowest_tsn;
466} sctp_ecnehdr_t;
467
468typedef struct sctp_ecne_chunk {
469 sctp_chunkhdr_t chunk_hdr;
470 sctp_ecnehdr_t ence_hdr;
471} __attribute__((packed)) sctp_ecne_chunk_t;
472
473/* RFC 2960. Appendix A. Explicit Congestion Notification.
474 * Congestion Window Reduced (CWR) (13)
475 */
476typedef struct sctp_cwrhdr {
477 __u32 lowest_tsn;
478} sctp_cwrhdr_t;
479
480typedef struct sctp_cwr_chunk {
481 sctp_chunkhdr_t chunk_hdr;
482 sctp_cwrhdr_t cwr_hdr;
483} __attribute__((packed)) sctp_cwr_chunk_t;
484
485/* PR-SCTP
486 * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
487 *
488 * Forward Cumulative TSN chunk has the following format:
489 *
490 * 0 1 2 3
491 * 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
492 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
493 * | Type = 192 | Flags = 0x00 | Length = Variable |
494 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
495 * | New Cumulative TSN |
496 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
497 * | Stream-1 | Stream Sequence-1 |
498 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
499 * \ /
500 * / \
501 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
502 * | Stream-N | Stream Sequence-N |
503 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
504 *
505 * Chunk Flags:
506 *
507 * Set to all zeros on transmit and ignored on receipt.
508 *
509 * New Cumulative TSN: 32 bit u_int
510 *
511 * This indicates the new cumulative TSN to the data receiver. Upon
512 * the reception of this value, the data receiver MUST consider
513 * any missing TSNs earlier than or equal to this value as received
514 * and stop reporting them as gaps in any subsequent SACKs.
515 *
516 * Stream-N: 16 bit u_int
517 *
518 * This field holds a stream number that was skipped by this
519 * FWD-TSN.
520 *
521 * Stream Sequence-N: 16 bit u_int
522 * This field holds the sequence number associated with the stream
523 * that was skipped. The stream sequence field holds the largest stream
524 * sequence number in this stream being skipped. The receiver of
525 * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
526 * to enable delivery of any stranded TSN's that remain on the stream
527 * re-ordering queues. This field MUST NOT report TSN's corresponding
528 * to DATA chunk that are marked as unordered. For ordered DATA
529 * chunks this field MUST be filled in.
530 */
531struct sctp_fwdtsn_skip {
532 __u16 stream;
533 __u16 ssn;
534} __attribute__((packed));
535
536struct sctp_fwdtsn_hdr {
537 __u32 new_cum_tsn;
538 struct sctp_fwdtsn_skip skip[0];
539} __attribute((packed));
540
541struct sctp_fwdtsn_chunk {
542 struct sctp_chunkhdr chunk_hdr;
543 struct sctp_fwdtsn_hdr fwdtsn_hdr;
544} __attribute((packed));
545
546
547/* ADDIP
548 * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
549 *
550 * Serial Number: 32 bits (unsigned integer)
551 * This value represents a Serial Number for the ASCONF Chunk. The
552 * valid range of Serial Number is from 0 to 2^32-1.
553 * Serial Numbers wrap back to 0 after reaching 2^32 -1.
554 *
555 * Address Parameter: 8 or 20 bytes (depending on type)
556 * The address is an address of the sender of the ASCONF chunk,
557 * the address MUST be considered part of the association by the
558 * peer endpoint. This field may be used by the receiver of the
559 * ASCONF to help in finding the association. This parameter MUST
560 * be present in every ASCONF message i.e. it is a mandatory TLV
561 * parameter.
562 *
563 * ASCONF Parameter: TLV format
564 * Each Address configuration change is represented by a TLV
565 * parameter as defined in Section 3.2. One or more requests may
566 * be present in an ASCONF Chunk.
567 *
568 * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
569 *
570 * Serial Number: 32 bits (unsigned integer)
571 * This value represents the Serial Number for the received ASCONF
572 * Chunk that is acknowledged by this chunk. This value is copied
573 * from the received ASCONF Chunk.
574 *
575 * ASCONF Parameter Response: TLV format
576 * The ASCONF Parameter Response is used in the ASCONF-ACK to
577 * report status of ASCONF processing.
578 */
579typedef struct sctp_addip_param {
580 sctp_paramhdr_t param_hdr;
581 __u32 crr_id;
582} __attribute__((packed)) sctp_addip_param_t;
583
584typedef struct sctp_addiphdr {
585 __u32 serial;
586 __u8 params[0];
587} __attribute__((packed)) sctp_addiphdr_t;
588
589typedef struct sctp_addip_chunk {
590 sctp_chunkhdr_t chunk_hdr;
591 sctp_addiphdr_t addip_hdr;
592} __attribute__((packed)) sctp_addip_chunk_t;
593
594#endif /* __LINUX_SCTP_H__ */