sctp.h 19 KB

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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 <lksctp-developerst@lists.sourceforge.net>
  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 <piggy@acm.org>
  39. * Karl Knutson <karl@athena.chicago.il.us>
  40. * Jon Grimm <jgrimm@us.ibm.com>
  41. * Xingang Guo <xingang.guo@intel.com>
  42. * randall@sctp.chicago.il.us
  43. * kmorneau@cisco.com
  44. * qxie1@email.mot.com
  45. * Sridhar Samudrala <sri@us.ibm.com>
  46. * Kevin Gao <kevin.gao@intel.com>
  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. #include <linux/in.h> /* We need in_addr. */
  54. #include <linux/in6.h> /* We need in6_addr. */
  55. /* Section 3.1. SCTP Common Header Format */
  56. typedef struct sctphdr {
  57. __be16 source;
  58. __be16 dest;
  59. __be32 vtag;
  60. __be32 checksum;
  61. } __attribute__((packed)) sctp_sctphdr_t;
  62. /* Section 3.2. Chunk Field Descriptions. */
  63. typedef struct sctp_chunkhdr {
  64. __u8 type;
  65. __u8 flags;
  66. __be16 length;
  67. } __attribute__((packed)) sctp_chunkhdr_t;
  68. /* Section 3.2. Chunk Type Values.
  69. * [Chunk Type] identifies the type of information contained in the Chunk
  70. * Value field. It takes a value from 0 to 254. The value of 255 is
  71. * reserved for future use as an extension field.
  72. */
  73. typedef enum {
  74. SCTP_CID_DATA = 0,
  75. SCTP_CID_INIT = 1,
  76. SCTP_CID_INIT_ACK = 2,
  77. SCTP_CID_SACK = 3,
  78. SCTP_CID_HEARTBEAT = 4,
  79. SCTP_CID_HEARTBEAT_ACK = 5,
  80. SCTP_CID_ABORT = 6,
  81. SCTP_CID_SHUTDOWN = 7,
  82. SCTP_CID_SHUTDOWN_ACK = 8,
  83. SCTP_CID_ERROR = 9,
  84. SCTP_CID_COOKIE_ECHO = 10,
  85. SCTP_CID_COOKIE_ACK = 11,
  86. SCTP_CID_ECN_ECNE = 12,
  87. SCTP_CID_ECN_CWR = 13,
  88. SCTP_CID_SHUTDOWN_COMPLETE = 14,
  89. /* PR-SCTP Sec 3.2 */
  90. SCTP_CID_FWD_TSN = 0xC0,
  91. /* Use hex, as defined in ADDIP sec. 3.1 */
  92. SCTP_CID_ASCONF = 0xC1,
  93. SCTP_CID_ASCONF_ACK = 0x80,
  94. } sctp_cid_t; /* enum */
  95. /* Section 3.2
  96. * Chunk Types are encoded such that the highest-order two bits specify
  97. * the action that must be taken if the processing endpoint does not
  98. * recognize the Chunk Type.
  99. */
  100. typedef enum {
  101. SCTP_CID_ACTION_DISCARD = 0x00,
  102. SCTP_CID_ACTION_DISCARD_ERR = 0x40,
  103. SCTP_CID_ACTION_SKIP = 0x80,
  104. SCTP_CID_ACTION_SKIP_ERR = 0xc0,
  105. } sctp_cid_action_t;
  106. enum { SCTP_CID_ACTION_MASK = 0xc0, };
  107. /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
  108. *
  109. * 3.3.7 Abort Association (ABORT) (6):
  110. * The T bit is set to 0 if the sender had a TCB that it destroyed.
  111. * If the sender did not have a TCB it should set this bit to 1.
  112. */
  113. enum { SCTP_CHUNK_FLAG_T = 0x01 };
  114. /*
  115. * Set the T bit
  116. *
  117. * 0 1 2 3
  118. * 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
  119. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  120. * | Type = 14 |Reserved |T| Length = 4 |
  121. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  122. *
  123. * Chunk Flags: 8 bits
  124. *
  125. * Reserved: 7 bits
  126. * Set to 0 on transmit and ignored on receipt.
  127. *
  128. * T bit: 1 bit
  129. * The T bit is set to 0 if the sender had a TCB that it destroyed. If
  130. * the sender did NOT have a TCB it should set this bit to 1.
  131. *
  132. * Note: Special rules apply to this chunk for verification, please
  133. * see Section 8.5.1 for details.
  134. */
  135. #define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
  136. /* RFC 2960
  137. * Section 3.2.1 Optional/Variable-length Parmaeter Format.
  138. */
  139. typedef struct sctp_paramhdr {
  140. __be16 type;
  141. __be16 length;
  142. } __attribute__((packed)) sctp_paramhdr_t;
  143. typedef enum {
  144. /* RFC 2960 Section 3.3.5 */
  145. SCTP_PARAM_HEARTBEAT_INFO = __constant_htons(1),
  146. /* RFC 2960 Section 3.3.2.1 */
  147. SCTP_PARAM_IPV4_ADDRESS = __constant_htons(5),
  148. SCTP_PARAM_IPV6_ADDRESS = __constant_htons(6),
  149. SCTP_PARAM_STATE_COOKIE = __constant_htons(7),
  150. SCTP_PARAM_UNRECOGNIZED_PARAMETERS = __constant_htons(8),
  151. SCTP_PARAM_COOKIE_PRESERVATIVE = __constant_htons(9),
  152. SCTP_PARAM_HOST_NAME_ADDRESS = __constant_htons(11),
  153. SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = __constant_htons(12),
  154. SCTP_PARAM_ECN_CAPABLE = __constant_htons(0x8000),
  155. /* PR-SCTP Sec 3.1 */
  156. SCTP_PARAM_FWD_TSN_SUPPORT = __constant_htons(0xc000),
  157. /* Add-IP Extension. Section 3.2 */
  158. SCTP_PARAM_ADD_IP = __constant_htons(0xc001),
  159. SCTP_PARAM_DEL_IP = __constant_htons(0xc002),
  160. SCTP_PARAM_ERR_CAUSE = __constant_htons(0xc003),
  161. SCTP_PARAM_SET_PRIMARY = __constant_htons(0xc004),
  162. SCTP_PARAM_SUCCESS_REPORT = __constant_htons(0xc005),
  163. SCTP_PARAM_ADAPTATION_LAYER_IND = __constant_htons(0xc006),
  164. } sctp_param_t; /* enum */
  165. /* RFC 2960 Section 3.2.1
  166. * The Parameter Types are encoded such that the highest-order two bits
  167. * specify the action that must be taken if the processing endpoint does
  168. * not recognize the Parameter Type.
  169. *
  170. */
  171. typedef enum {
  172. SCTP_PARAM_ACTION_DISCARD = __constant_htons(0x0000),
  173. SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000),
  174. SCTP_PARAM_ACTION_SKIP = __constant_htons(0x8000),
  175. SCTP_PARAM_ACTION_SKIP_ERR = __constant_htons(0xc000),
  176. } sctp_param_action_t;
  177. enum { SCTP_PARAM_ACTION_MASK = __constant_htons(0xc000), };
  178. /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
  179. typedef struct sctp_datahdr {
  180. __be32 tsn;
  181. __be16 stream;
  182. __be16 ssn;
  183. __be32 ppid;
  184. __u8 payload[0];
  185. } __attribute__((packed)) sctp_datahdr_t;
  186. typedef struct sctp_data_chunk {
  187. sctp_chunkhdr_t chunk_hdr;
  188. sctp_datahdr_t data_hdr;
  189. } __attribute__((packed)) sctp_data_chunk_t;
  190. /* DATA Chuck Specific Flags */
  191. enum {
  192. SCTP_DATA_MIDDLE_FRAG = 0x00,
  193. SCTP_DATA_LAST_FRAG = 0x01,
  194. SCTP_DATA_FIRST_FRAG = 0x02,
  195. SCTP_DATA_NOT_FRAG = 0x03,
  196. SCTP_DATA_UNORDERED = 0x04,
  197. };
  198. enum { SCTP_DATA_FRAG_MASK = 0x03, };
  199. /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
  200. *
  201. * This chunk is used to initiate a SCTP association between two
  202. * endpoints.
  203. */
  204. typedef struct sctp_inithdr {
  205. __be32 init_tag;
  206. __be32 a_rwnd;
  207. __be16 num_outbound_streams;
  208. __be16 num_inbound_streams;
  209. __be32 initial_tsn;
  210. __u8 params[0];
  211. } __attribute__((packed)) sctp_inithdr_t;
  212. typedef struct sctp_init_chunk {
  213. sctp_chunkhdr_t chunk_hdr;
  214. sctp_inithdr_t init_hdr;
  215. } __attribute__((packed)) sctp_init_chunk_t;
  216. /* Section 3.3.2.1. IPv4 Address Parameter (5) */
  217. typedef struct sctp_ipv4addr_param {
  218. sctp_paramhdr_t param_hdr;
  219. struct in_addr addr;
  220. } __attribute__((packed)) sctp_ipv4addr_param_t;
  221. /* Section 3.3.2.1. IPv6 Address Parameter (6) */
  222. typedef struct sctp_ipv6addr_param {
  223. sctp_paramhdr_t param_hdr;
  224. struct in6_addr addr;
  225. } __attribute__((packed)) sctp_ipv6addr_param_t;
  226. /* Section 3.3.2.1 Cookie Preservative (9) */
  227. typedef struct sctp_cookie_preserve_param {
  228. sctp_paramhdr_t param_hdr;
  229. __be32 lifespan_increment;
  230. } __attribute__((packed)) sctp_cookie_preserve_param_t;
  231. /* Section 3.3.2.1 Host Name Address (11) */
  232. typedef struct sctp_hostname_param {
  233. sctp_paramhdr_t param_hdr;
  234. uint8_t hostname[0];
  235. } __attribute__((packed)) sctp_hostname_param_t;
  236. /* Section 3.3.2.1 Supported Address Types (12) */
  237. typedef struct sctp_supported_addrs_param {
  238. sctp_paramhdr_t param_hdr;
  239. __be16 types[0];
  240. } __attribute__((packed)) sctp_supported_addrs_param_t;
  241. /* Appendix A. ECN Capable (32768) */
  242. typedef struct sctp_ecn_capable_param {
  243. sctp_paramhdr_t param_hdr;
  244. } __attribute__((packed)) sctp_ecn_capable_param_t;
  245. /* ADDIP Section 3.2.6 Adaptation Layer Indication */
  246. typedef struct sctp_adaptation_ind_param {
  247. struct sctp_paramhdr param_hdr;
  248. __be32 adaptation_ind;
  249. } __attribute__((packed)) sctp_adaptation_ind_param_t;
  250. /* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
  251. * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
  252. * association.
  253. */
  254. typedef sctp_init_chunk_t sctp_initack_chunk_t;
  255. /* Section 3.3.3.1 State Cookie (7) */
  256. typedef struct sctp_cookie_param {
  257. sctp_paramhdr_t p;
  258. __u8 body[0];
  259. } __attribute__((packed)) sctp_cookie_param_t;
  260. /* Section 3.3.3.1 Unrecognized Parameters (8) */
  261. typedef struct sctp_unrecognized_param {
  262. sctp_paramhdr_t param_hdr;
  263. sctp_paramhdr_t unrecognized;
  264. } __attribute__((packed)) sctp_unrecognized_param_t;
  265. /*
  266. * 3.3.4 Selective Acknowledgement (SACK) (3):
  267. *
  268. * This chunk is sent to the peer endpoint to acknowledge received DATA
  269. * chunks and to inform the peer endpoint of gaps in the received
  270. * subsequences of DATA chunks as represented by their TSNs.
  271. */
  272. typedef struct sctp_gap_ack_block {
  273. __be16 start;
  274. __be16 end;
  275. } __attribute__((packed)) sctp_gap_ack_block_t;
  276. typedef __be32 sctp_dup_tsn_t;
  277. typedef union {
  278. sctp_gap_ack_block_t gab;
  279. sctp_dup_tsn_t dup;
  280. } sctp_sack_variable_t;
  281. typedef struct sctp_sackhdr {
  282. __be32 cum_tsn_ack;
  283. __be32 a_rwnd;
  284. __be16 num_gap_ack_blocks;
  285. __be16 num_dup_tsns;
  286. sctp_sack_variable_t variable[0];
  287. } __attribute__((packed)) sctp_sackhdr_t;
  288. typedef struct sctp_sack_chunk {
  289. sctp_chunkhdr_t chunk_hdr;
  290. sctp_sackhdr_t sack_hdr;
  291. } __attribute__((packed)) sctp_sack_chunk_t;
  292. /* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
  293. *
  294. * An endpoint should send this chunk to its peer endpoint to probe the
  295. * reachability of a particular destination transport address defined in
  296. * the present association.
  297. */
  298. typedef struct sctp_heartbeathdr {
  299. sctp_paramhdr_t info;
  300. } __attribute__((packed)) sctp_heartbeathdr_t;
  301. typedef struct sctp_heartbeat_chunk {
  302. sctp_chunkhdr_t chunk_hdr;
  303. sctp_heartbeathdr_t hb_hdr;
  304. } __attribute__((packed)) sctp_heartbeat_chunk_t;
  305. /* For the abort and shutdown ACK we must carry the init tag in the
  306. * common header. Just the common header is all that is needed with a
  307. * chunk descriptor.
  308. */
  309. typedef struct sctp_abort_chunk {
  310. sctp_chunkhdr_t uh;
  311. } __attribute__((packed)) sctp_abort_chunk_t;
  312. /* For the graceful shutdown we must carry the tag (in common header)
  313. * and the highest consecutive acking value.
  314. */
  315. typedef struct sctp_shutdownhdr {
  316. __be32 cum_tsn_ack;
  317. } __attribute__((packed)) sctp_shutdownhdr_t;
  318. struct sctp_shutdown_chunk_t {
  319. sctp_chunkhdr_t chunk_hdr;
  320. sctp_shutdownhdr_t shutdown_hdr;
  321. } __attribute__ ((packed));
  322. /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
  323. typedef struct sctp_errhdr {
  324. __be16 cause;
  325. __be16 length;
  326. __u8 variable[0];
  327. } __attribute__((packed)) sctp_errhdr_t;
  328. typedef struct sctp_operr_chunk {
  329. sctp_chunkhdr_t chunk_hdr;
  330. sctp_errhdr_t err_hdr;
  331. } __attribute__((packed)) sctp_operr_chunk_t;
  332. /* RFC 2960 3.3.10 - Operation Error
  333. *
  334. * Cause Code: 16 bits (unsigned integer)
  335. *
  336. * Defines the type of error conditions being reported.
  337. * Cause Code
  338. * Value Cause Code
  339. * --------- ----------------
  340. * 1 Invalid Stream Identifier
  341. * 2 Missing Mandatory Parameter
  342. * 3 Stale Cookie Error
  343. * 4 Out of Resource
  344. * 5 Unresolvable Address
  345. * 6 Unrecognized Chunk Type
  346. * 7 Invalid Mandatory Parameter
  347. * 8 Unrecognized Parameters
  348. * 9 No User Data
  349. * 10 Cookie Received While Shutting Down
  350. */
  351. typedef enum {
  352. SCTP_ERROR_NO_ERROR = __constant_htons(0x00),
  353. SCTP_ERROR_INV_STRM = __constant_htons(0x01),
  354. SCTP_ERROR_MISS_PARAM = __constant_htons(0x02),
  355. SCTP_ERROR_STALE_COOKIE = __constant_htons(0x03),
  356. SCTP_ERROR_NO_RESOURCE = __constant_htons(0x04),
  357. SCTP_ERROR_DNS_FAILED = __constant_htons(0x05),
  358. SCTP_ERROR_UNKNOWN_CHUNK = __constant_htons(0x06),
  359. SCTP_ERROR_INV_PARAM = __constant_htons(0x07),
  360. SCTP_ERROR_UNKNOWN_PARAM = __constant_htons(0x08),
  361. SCTP_ERROR_NO_DATA = __constant_htons(0x09),
  362. SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a),
  363. /* SCTP Implementation Guide:
  364. * 11 Restart of an association with new addresses
  365. * 12 User Initiated Abort
  366. * 13 Protocol Violation
  367. */
  368. SCTP_ERROR_RESTART = __constant_htons(0x0b),
  369. SCTP_ERROR_USER_ABORT = __constant_htons(0x0c),
  370. SCTP_ERROR_PROTO_VIOLATION = __constant_htons(0x0d),
  371. /* ADDIP Section 3.3 New Error Causes
  372. *
  373. * Four new Error Causes are added to the SCTP Operational Errors,
  374. * primarily for use in the ASCONF-ACK chunk.
  375. *
  376. * Value Cause Code
  377. * --------- ----------------
  378. * 0x0100 Request to Delete Last Remaining IP Address.
  379. * 0x0101 Operation Refused Due to Resource Shortage.
  380. * 0x0102 Request to Delete Source IP Address.
  381. * 0x0103 Association Aborted due to illegal ASCONF-ACK
  382. * 0x0104 Request refused - no authorization.
  383. */
  384. SCTP_ERROR_DEL_LAST_IP = __constant_htons(0x0100),
  385. SCTP_ERROR_RSRC_LOW = __constant_htons(0x0101),
  386. SCTP_ERROR_DEL_SRC_IP = __constant_htons(0x0102),
  387. SCTP_ERROR_ASCONF_ACK = __constant_htons(0x0103),
  388. SCTP_ERROR_REQ_REFUSED = __constant_htons(0x0104)
  389. } sctp_error_t;
  390. /* RFC 2960. Appendix A. Explicit Congestion Notification.
  391. * Explicit Congestion Notification Echo (ECNE) (12)
  392. */
  393. typedef struct sctp_ecnehdr {
  394. __be32 lowest_tsn;
  395. } sctp_ecnehdr_t;
  396. typedef struct sctp_ecne_chunk {
  397. sctp_chunkhdr_t chunk_hdr;
  398. sctp_ecnehdr_t ence_hdr;
  399. } __attribute__((packed)) sctp_ecne_chunk_t;
  400. /* RFC 2960. Appendix A. Explicit Congestion Notification.
  401. * Congestion Window Reduced (CWR) (13)
  402. */
  403. typedef struct sctp_cwrhdr {
  404. __be32 lowest_tsn;
  405. } sctp_cwrhdr_t;
  406. typedef struct sctp_cwr_chunk {
  407. sctp_chunkhdr_t chunk_hdr;
  408. sctp_cwrhdr_t cwr_hdr;
  409. } __attribute__((packed)) sctp_cwr_chunk_t;
  410. /* PR-SCTP
  411. * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
  412. *
  413. * Forward Cumulative TSN chunk has the following format:
  414. *
  415. * 0 1 2 3
  416. * 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
  417. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  418. * | Type = 192 | Flags = 0x00 | Length = Variable |
  419. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  420. * | New Cumulative TSN |
  421. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  422. * | Stream-1 | Stream Sequence-1 |
  423. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  424. * \ /
  425. * / \
  426. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  427. * | Stream-N | Stream Sequence-N |
  428. * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  429. *
  430. * Chunk Flags:
  431. *
  432. * Set to all zeros on transmit and ignored on receipt.
  433. *
  434. * New Cumulative TSN: 32 bit u_int
  435. *
  436. * This indicates the new cumulative TSN to the data receiver. Upon
  437. * the reception of this value, the data receiver MUST consider
  438. * any missing TSNs earlier than or equal to this value as received
  439. * and stop reporting them as gaps in any subsequent SACKs.
  440. *
  441. * Stream-N: 16 bit u_int
  442. *
  443. * This field holds a stream number that was skipped by this
  444. * FWD-TSN.
  445. *
  446. * Stream Sequence-N: 16 bit u_int
  447. * This field holds the sequence number associated with the stream
  448. * that was skipped. The stream sequence field holds the largest stream
  449. * sequence number in this stream being skipped. The receiver of
  450. * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
  451. * to enable delivery of any stranded TSN's that remain on the stream
  452. * re-ordering queues. This field MUST NOT report TSN's corresponding
  453. * to DATA chunk that are marked as unordered. For ordered DATA
  454. * chunks this field MUST be filled in.
  455. */
  456. struct sctp_fwdtsn_skip {
  457. __be16 stream;
  458. __be16 ssn;
  459. } __attribute__((packed));
  460. struct sctp_fwdtsn_hdr {
  461. __be32 new_cum_tsn;
  462. struct sctp_fwdtsn_skip skip[0];
  463. } __attribute((packed));
  464. struct sctp_fwdtsn_chunk {
  465. struct sctp_chunkhdr chunk_hdr;
  466. struct sctp_fwdtsn_hdr fwdtsn_hdr;
  467. } __attribute((packed));
  468. /* ADDIP
  469. * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
  470. *
  471. * Serial Number: 32 bits (unsigned integer)
  472. * This value represents a Serial Number for the ASCONF Chunk. The
  473. * valid range of Serial Number is from 0 to 2^32-1.
  474. * Serial Numbers wrap back to 0 after reaching 2^32 -1.
  475. *
  476. * Address Parameter: 8 or 20 bytes (depending on type)
  477. * The address is an address of the sender of the ASCONF chunk,
  478. * the address MUST be considered part of the association by the
  479. * peer endpoint. This field may be used by the receiver of the
  480. * ASCONF to help in finding the association. This parameter MUST
  481. * be present in every ASCONF message i.e. it is a mandatory TLV
  482. * parameter.
  483. *
  484. * ASCONF Parameter: TLV format
  485. * Each Address configuration change is represented by a TLV
  486. * parameter as defined in Section 3.2. One or more requests may
  487. * be present in an ASCONF Chunk.
  488. *
  489. * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
  490. *
  491. * Serial Number: 32 bits (unsigned integer)
  492. * This value represents the Serial Number for the received ASCONF
  493. * Chunk that is acknowledged by this chunk. This value is copied
  494. * from the received ASCONF Chunk.
  495. *
  496. * ASCONF Parameter Response: TLV format
  497. * The ASCONF Parameter Response is used in the ASCONF-ACK to
  498. * report status of ASCONF processing.
  499. */
  500. typedef struct sctp_addip_param {
  501. sctp_paramhdr_t param_hdr;
  502. __be32 crr_id;
  503. } __attribute__((packed)) sctp_addip_param_t;
  504. typedef struct sctp_addiphdr {
  505. __be32 serial;
  506. __u8 params[0];
  507. } __attribute__((packed)) sctp_addiphdr_t;
  508. typedef struct sctp_addip_chunk {
  509. sctp_chunkhdr_t chunk_hdr;
  510. sctp_addiphdr_t addip_hdr;
  511. } __attribute__((packed)) sctp_addip_chunk_t;
  512. #endif /* __LINUX_SCTP_H__ */