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TOMOYO Linux Cross Reference
Linux/include/linux/sctp.h

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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  * 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, 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 
 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 */
 59 typedef struct sctphdr {
 60         __be16 source;
 61         __be16 dest;
 62         __be32 vtag;
 63         __le32 checksum;
 64 } __packed sctp_sctphdr_t;
 65 
 66 #ifdef __KERNEL__
 67 #include <linux/skbuff.h>
 68 
 69 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
 70 {
 71         return (struct sctphdr *)skb_transport_header(skb);
 72 }
 73 #endif
 74 
 75 /* Section 3.2.  Chunk Field Descriptions. */
 76 typedef struct sctp_chunkhdr {
 77         __u8 type;
 78         __u8 flags;
 79         __be16 length;
 80 } __packed sctp_chunkhdr_t;
 81 
 82 
 83 /* Section 3.2.  Chunk Type Values.
 84  * [Chunk Type] identifies the type of information contained in the Chunk
 85  * Value field. It takes a value from 0 to 254. The value of 255 is
 86  * reserved for future use as an extension field.
 87  */
 88 typedef enum {
 89         SCTP_CID_DATA                   = 0,
 90         SCTP_CID_INIT                   = 1,
 91         SCTP_CID_INIT_ACK               = 2,
 92         SCTP_CID_SACK                   = 3,
 93         SCTP_CID_HEARTBEAT              = 4,
 94         SCTP_CID_HEARTBEAT_ACK          = 5,
 95         SCTP_CID_ABORT                  = 6,
 96         SCTP_CID_SHUTDOWN               = 7,
 97         SCTP_CID_SHUTDOWN_ACK           = 8,
 98         SCTP_CID_ERROR                  = 9,
 99         SCTP_CID_COOKIE_ECHO            = 10,
100         SCTP_CID_COOKIE_ACK             = 11,
101         SCTP_CID_ECN_ECNE               = 12,
102         SCTP_CID_ECN_CWR                = 13,
103         SCTP_CID_SHUTDOWN_COMPLETE      = 14,
104 
105         /* AUTH Extension Section 4.1 */
106         SCTP_CID_AUTH                   = 0x0F,
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_ASCONF_ACK             = 0x80,
114 } sctp_cid_t; /* enum */
115 
116 
117 /* Section 3.2
118  *  Chunk Types are encoded such that the highest-order two bits specify
119  *  the action that must be taken if the processing endpoint does not
120  *  recognize the Chunk Type.
121  */
122 typedef enum {
123         SCTP_CID_ACTION_DISCARD     = 0x00,
124         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
125         SCTP_CID_ACTION_SKIP        = 0x80,
126         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
127 } sctp_cid_action_t;
128 
129 enum { SCTP_CID_ACTION_MASK = 0xc0, };
130 
131 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
132  *
133  * 3.3.7 Abort Association (ABORT) (6):
134  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
135  *    If the sender did not have a TCB it should set this bit to 1.
136  */
137 enum { SCTP_CHUNK_FLAG_T = 0x01 };
138 
139 /*
140  *  Set the T bit
141  *
142  *      0                   1                   2                   3
143  *      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
144  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145  *     |   Type = 14   |Reserved     |T|      Length = 4               |
146  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147  *
148  * Chunk Flags: 8 bits
149  *
150  *   Reserved:  7 bits
151  *     Set to 0 on transmit and ignored on receipt.
152  *
153  *   T bit:  1 bit
154  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
155  *     the sender did NOT have a TCB it should set this bit to 1.
156  *
157  * Note: Special rules apply to this chunk for verification, please
158  * see Section 8.5.1 for details.
159  */
160 
161 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
162 
163 /* RFC 2960
164  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
165  */
166 
167 typedef struct sctp_paramhdr {
168         __be16 type;
169         __be16 length;
170 } __packed sctp_paramhdr_t;
171 
172 typedef enum {
173 
174         /* RFC 2960 Section 3.3.5 */
175         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
176         /* RFC 2960 Section 3.3.2.1 */
177         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
178         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
179         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
180         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
181         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
182         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
183         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
184         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
185 
186         /* AUTH Extension Section 3 */
187         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
188         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
189         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
190 
191         /* Add-IP: Supported Extensions, Section 4.2 */
192         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
193 
194         /* PR-SCTP Sec 3.1 */
195         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
196 
197         /* Add-IP Extension. Section 3.2 */
198         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
199         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
200         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
201         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
202         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
203         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
204 
205 } sctp_param_t; /* enum */
206 
207 
208 /* RFC 2960 Section 3.2.1
209  *  The Parameter Types are encoded such that the highest-order two bits
210  *  specify the action that must be taken if the processing endpoint does
211  *  not recognize the Parameter Type.
212  *
213  */
214 typedef enum {
215         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
216         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
217         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
218         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
219 } sctp_param_action_t;
220 
221 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
222 
223 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
224 
225 typedef struct sctp_datahdr {
226         __be32 tsn;
227         __be16 stream;
228         __be16 ssn;
229         __be32 ppid;
230         __u8  payload[0];
231 } __packed sctp_datahdr_t;
232 
233 typedef struct sctp_data_chunk {
234         sctp_chunkhdr_t chunk_hdr;
235         sctp_datahdr_t  data_hdr;
236 } __packed sctp_data_chunk_t;
237 
238 /* DATA Chuck Specific Flags */
239 enum {
240         SCTP_DATA_MIDDLE_FRAG   = 0x00,
241         SCTP_DATA_LAST_FRAG     = 0x01,
242         SCTP_DATA_FIRST_FRAG    = 0x02,
243         SCTP_DATA_NOT_FRAG      = 0x03,
244         SCTP_DATA_UNORDERED     = 0x04,
245         SCTP_DATA_SACK_IMM      = 0x08,
246 };
247 enum { SCTP_DATA_FRAG_MASK = 0x03, };
248 
249 
250 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
251  *
252  *  This chunk is used to initiate a SCTP association between two
253  *  endpoints.
254  */
255 typedef struct sctp_inithdr {
256         __be32 init_tag;
257         __be32 a_rwnd;
258         __be16 num_outbound_streams;
259         __be16 num_inbound_streams;
260         __be32 initial_tsn;
261         __u8  params[0];
262 } __packed sctp_inithdr_t;
263 
264 typedef struct sctp_init_chunk {
265         sctp_chunkhdr_t chunk_hdr;
266         sctp_inithdr_t init_hdr;
267 } __packed sctp_init_chunk_t;
268 
269 
270 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
271 typedef struct sctp_ipv4addr_param {
272         sctp_paramhdr_t param_hdr;
273         struct in_addr  addr;
274 } __packed sctp_ipv4addr_param_t;
275 
276 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
277 typedef struct sctp_ipv6addr_param {
278         sctp_paramhdr_t param_hdr;
279         struct in6_addr addr;
280 } __packed sctp_ipv6addr_param_t;
281 
282 /* Section 3.3.2.1 Cookie Preservative (9) */
283 typedef struct sctp_cookie_preserve_param {
284         sctp_paramhdr_t param_hdr;
285         __be32          lifespan_increment;
286 } __packed sctp_cookie_preserve_param_t;
287 
288 /* Section 3.3.2.1 Host Name Address (11) */
289 typedef struct sctp_hostname_param {
290         sctp_paramhdr_t param_hdr;
291         uint8_t hostname[0];
292 } __packed sctp_hostname_param_t;
293 
294 /* Section 3.3.2.1 Supported Address Types (12) */
295 typedef struct sctp_supported_addrs_param {
296         sctp_paramhdr_t param_hdr;
297         __be16 types[0];
298 } __packed sctp_supported_addrs_param_t;
299 
300 /* Appendix A. ECN Capable (32768) */
301 typedef struct sctp_ecn_capable_param {
302         sctp_paramhdr_t param_hdr;
303 } __packed sctp_ecn_capable_param_t;
304 
305 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
306 typedef struct sctp_adaptation_ind_param {
307         struct sctp_paramhdr param_hdr;
308         __be32 adaptation_ind;
309 } __packed sctp_adaptation_ind_param_t;
310 
311 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
312 typedef struct sctp_supported_ext_param {
313         struct sctp_paramhdr param_hdr;
314         __u8 chunks[0];
315 } __packed sctp_supported_ext_param_t;
316 
317 /* AUTH Section 3.1 Random */
318 typedef struct sctp_random_param {
319         sctp_paramhdr_t param_hdr;
320         __u8 random_val[0];
321 } __packed sctp_random_param_t;
322 
323 /* AUTH Section 3.2 Chunk List */
324 typedef struct sctp_chunks_param {
325         sctp_paramhdr_t param_hdr;
326         __u8 chunks[0];
327 } __packed sctp_chunks_param_t;
328 
329 /* AUTH Section 3.3 HMAC Algorithm */
330 typedef struct sctp_hmac_algo_param {
331         sctp_paramhdr_t param_hdr;
332         __be16 hmac_ids[0];
333 } __packed sctp_hmac_algo_param_t;
334 
335 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
336  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
337  *   association.
338  */
339 typedef sctp_init_chunk_t sctp_initack_chunk_t;
340 
341 /* Section 3.3.3.1 State Cookie (7) */
342 typedef struct sctp_cookie_param {
343         sctp_paramhdr_t p;
344         __u8 body[0];
345 } __packed sctp_cookie_param_t;
346 
347 /* Section 3.3.3.1 Unrecognized Parameters (8) */
348 typedef struct sctp_unrecognized_param {
349         sctp_paramhdr_t param_hdr;
350         sctp_paramhdr_t unrecognized;
351 } __packed sctp_unrecognized_param_t;
352 
353 
354 
355 /*
356  * 3.3.4 Selective Acknowledgement (SACK) (3):
357  *
358  *  This chunk is sent to the peer endpoint to acknowledge received DATA
359  *  chunks and to inform the peer endpoint of gaps in the received
360  *  subsequences of DATA chunks as represented by their TSNs.
361  */
362 
363 typedef struct sctp_gap_ack_block {
364         __be16 start;
365         __be16 end;
366 } __packed sctp_gap_ack_block_t;
367 
368 typedef __be32 sctp_dup_tsn_t;
369 
370 typedef union {
371         sctp_gap_ack_block_t    gab;
372         sctp_dup_tsn_t          dup;
373 } sctp_sack_variable_t;
374 
375 typedef struct sctp_sackhdr {
376         __be32 cum_tsn_ack;
377         __be32 a_rwnd;
378         __be16 num_gap_ack_blocks;
379         __be16 num_dup_tsns;
380         sctp_sack_variable_t variable[0];
381 } __packed sctp_sackhdr_t;
382 
383 typedef struct sctp_sack_chunk {
384         sctp_chunkhdr_t chunk_hdr;
385         sctp_sackhdr_t sack_hdr;
386 } __packed sctp_sack_chunk_t;
387 
388 
389 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
390  *
391  *  An endpoint should send this chunk to its peer endpoint to probe the
392  *  reachability of a particular destination transport address defined in
393  *  the present association.
394  */
395 
396 typedef struct sctp_heartbeathdr {
397         sctp_paramhdr_t info;
398 } __packed sctp_heartbeathdr_t;
399 
400 typedef struct sctp_heartbeat_chunk {
401         sctp_chunkhdr_t chunk_hdr;
402         sctp_heartbeathdr_t hb_hdr;
403 } __packed sctp_heartbeat_chunk_t;
404 
405 
406 /* For the abort and shutdown ACK we must carry the init tag in the
407  * common header. Just the common header is all that is needed with a
408  * chunk descriptor.
409  */
410 typedef struct sctp_abort_chunk {
411         sctp_chunkhdr_t uh;
412 } __packed sctp_abort_chunk_t;
413 
414 
415 /* For the graceful shutdown we must carry the tag (in common header)
416  * and the highest consecutive acking value.
417  */
418 typedef struct sctp_shutdownhdr {
419         __be32 cum_tsn_ack;
420 } __packed sctp_shutdownhdr_t;
421 
422 struct sctp_shutdown_chunk_t {
423         sctp_chunkhdr_t    chunk_hdr;
424         sctp_shutdownhdr_t shutdown_hdr;
425 } __packed;
426 
427 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
428 
429 typedef struct sctp_errhdr {
430         __be16 cause;
431         __be16 length;
432         __u8  variable[0];
433 } __packed sctp_errhdr_t;
434 
435 typedef struct sctp_operr_chunk {
436         sctp_chunkhdr_t chunk_hdr;
437         sctp_errhdr_t   err_hdr;
438 } __packed sctp_operr_chunk_t;
439 
440 /* RFC 2960 3.3.10 - Operation Error
441  *
442  * Cause Code: 16 bits (unsigned integer)
443  *
444  *     Defines the type of error conditions being reported.
445  *    Cause Code
446  *     Value           Cause Code
447  *     ---------      ----------------
448  *      1              Invalid Stream Identifier
449  *      2              Missing Mandatory Parameter
450  *      3              Stale Cookie Error
451  *      4              Out of Resource
452  *      5              Unresolvable Address
453  *      6              Unrecognized Chunk Type
454  *      7              Invalid Mandatory Parameter
455  *      8              Unrecognized Parameters
456  *      9              No User Data
457  *     10              Cookie Received While Shutting Down
458  */
459 typedef enum {
460 
461         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
462         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
463         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
464         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
465         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
466         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
467         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
468         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
469         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
470         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
471         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
472 
473 
474         /* SCTP Implementation Guide:
475          *  11  Restart of an association with new addresses
476          *  12  User Initiated Abort
477          *  13  Protocol Violation
478          */
479 
480         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
481         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
482         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
483 
484         /* ADDIP Section 3.3  New Error Causes
485          *
486          * Four new Error Causes are added to the SCTP Operational Errors,
487          * primarily for use in the ASCONF-ACK chunk.
488          *
489          * Value          Cause Code
490          * ---------      ----------------
491          * 0x00A0          Request to Delete Last Remaining IP Address.
492          * 0x00A1          Operation Refused Due to Resource Shortage.
493          * 0x00A2          Request to Delete Source IP Address.
494          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
495          * 0x00A4          Request refused - no authorization.
496          */
497         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
498         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
499         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
500         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
501         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
502 
503         /* AUTH Section 4.  New Error Cause
504          *
505          * This section defines a new error cause that will be sent if an AUTH
506          * chunk is received with an unsupported HMAC identifier.
507          * illustrates the new error cause.
508          *
509          * Cause Code      Error Cause Name
510          * --------------------------------------------------------------
511          * 0x0105          Unsupported HMAC Identifier
512          */
513          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
514 } sctp_error_t;
515 
516 
517 
518 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
519  *   Explicit Congestion Notification Echo (ECNE) (12)
520  */
521 typedef struct sctp_ecnehdr {
522         __be32 lowest_tsn;
523 } sctp_ecnehdr_t;
524 
525 typedef struct sctp_ecne_chunk {
526         sctp_chunkhdr_t chunk_hdr;
527         sctp_ecnehdr_t ence_hdr;
528 } __packed sctp_ecne_chunk_t;
529 
530 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
531  *   Congestion Window Reduced (CWR) (13)
532  */
533 typedef struct sctp_cwrhdr {
534         __be32 lowest_tsn;
535 } sctp_cwrhdr_t;
536 
537 typedef struct sctp_cwr_chunk {
538         sctp_chunkhdr_t chunk_hdr;
539         sctp_cwrhdr_t cwr_hdr;
540 } __packed sctp_cwr_chunk_t;
541 
542 /* PR-SCTP
543  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
544  *
545  * Forward Cumulative TSN chunk has the following format:
546  *
547  *        0                   1                   2                   3
548  *        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
549  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
551  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552  *      |                      New Cumulative TSN                       |
553  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554  *      |         Stream-1              |       Stream Sequence-1       |
555  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556  *      \                                                               /
557  *      /                                                               \
558  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559  *      |         Stream-N              |       Stream Sequence-N       |
560  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561  *
562  *      Chunk Flags:
563  *
564  *        Set to all zeros on transmit and ignored on receipt.
565  *
566  *      New Cumulative TSN: 32 bit u_int
567  *
568  *       This indicates the new cumulative TSN to the data receiver. Upon
569  *       the reception of this value, the data receiver MUST consider
570  *       any missing TSNs earlier than or equal to this value as received
571  *       and stop reporting them as gaps in any subsequent SACKs.
572  *
573  *      Stream-N: 16 bit u_int
574  *
575  *       This field holds a stream number that was skipped by this
576  *       FWD-TSN.
577  *
578  *      Stream Sequence-N: 16 bit u_int
579  *       This field holds the sequence number associated with the stream
580  *       that was skipped. The stream sequence field holds the largest stream
581  *       sequence number in this stream being skipped.  The receiver of
582  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
583  *       to enable delivery of any stranded TSN's that remain on the stream
584  *       re-ordering queues. This field MUST NOT report TSN's corresponding
585  *       to DATA chunk that are marked as unordered. For ordered DATA
586  *       chunks this field MUST be filled in.
587  */
588 struct sctp_fwdtsn_skip {
589         __be16 stream;
590         __be16 ssn;
591 } __packed;
592 
593 struct sctp_fwdtsn_hdr {
594         __be32 new_cum_tsn;
595         struct sctp_fwdtsn_skip skip[0];
596 } __packed;
597 
598 struct sctp_fwdtsn_chunk {
599         struct sctp_chunkhdr chunk_hdr;
600         struct sctp_fwdtsn_hdr fwdtsn_hdr;
601 } __packed;
602 
603 
604 /* ADDIP
605  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
606  *
607  *      Serial Number: 32 bits (unsigned integer)
608  *      This value represents a Serial Number for the ASCONF Chunk. The
609  *      valid range of Serial Number is from 0 to 2^32-1.
610  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
611  *
612  *      Address Parameter: 8 or 20 bytes (depending on type)
613  *      The address is an address of the sender of the ASCONF chunk,
614  *      the address MUST be considered part of the association by the
615  *      peer endpoint. This field may be used by the receiver of the 
616  *      ASCONF to help in finding the association. This parameter MUST
617  *      be present in every ASCONF message i.e. it is a mandatory TLV
618  *      parameter.
619  *
620  *      ASCONF Parameter: TLV format
621  *      Each Address configuration change is represented by a TLV
622  *      parameter as defined in Section 3.2. One or more requests may
623  *      be present in an ASCONF Chunk.
624  *
625  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
626  * 
627  *      Serial Number: 32 bits (unsigned integer)
628  *      This value represents the Serial Number for the received ASCONF
629  *      Chunk that is acknowledged by this chunk. This value is copied
630  *      from the received ASCONF Chunk. 
631  *
632  *      ASCONF Parameter Response: TLV format
633  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
634  *      report status of ASCONF processing.
635  */
636 typedef struct sctp_addip_param {
637         sctp_paramhdr_t param_hdr;
638         __be32          crr_id;
639 } __packed sctp_addip_param_t;
640 
641 typedef struct sctp_addiphdr {
642         __be32  serial;
643         __u8    params[0];
644 } __packed sctp_addiphdr_t;
645 
646 typedef struct sctp_addip_chunk {
647         sctp_chunkhdr_t chunk_hdr;
648         sctp_addiphdr_t addip_hdr;
649 } __packed sctp_addip_chunk_t;
650 
651 /* AUTH
652  * Section 4.1  Authentication Chunk (AUTH)
653  *
654  *   This chunk is used to hold the result of the HMAC calculation.
655  *
656  *    0                   1                   2                   3
657  *    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
658  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659  *   | Type = 0x0F   |   Flags=0     |             Length            |
660  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661  *   |     Shared Key Identifier     |   HMAC Identifier             |
662  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
663  *   |                                                               |
664  *   \                             HMAC                              /
665  *   /                                                               \
666  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
667  *
668  *   Type: 1 byte (unsigned integer)
669  *      This value MUST be set to 0x0F for  all AUTH-chunks.
670  *
671  *   Flags: 1 byte (unsigned integer)
672  *      Set to zero on transmit and ignored on receipt.
673  *
674  *   Length: 2 bytes (unsigned integer)
675  *      This value holds the length of the HMAC in bytes plus 8.
676  *
677  *  Shared Key Identifier: 2 bytes (unsigned integer)
678  *      This value describes which endpoint pair shared key is used.
679  *
680  *   HMAC Identifier: 2 bytes (unsigned integer)
681  *      This value describes which message digest is being used.  Table 2
682  *      shows the currently defined values.
683  *
684  *    The following Table 2 shows the currently defined values for HMAC
685  *       identifiers.
686  *
687  *       +-----------------+--------------------------+
688  *       | HMAC Identifier | Message Digest Algorithm |
689  *       +-----------------+--------------------------+
690  *       | 0               | Reserved                 |
691  *       | 1               | SHA-1 defined in [8]     |
692  *       | 2               | Reserved                 |
693  *       | 3               | SHA-256 defined in [8]   |
694  *       +-----------------+--------------------------+
695  *
696  *
697  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
698  *      calculation.
699  */
700 typedef struct sctp_authhdr {
701         __be16 shkey_id;
702         __be16 hmac_id;
703         __u8   hmac[0];
704 } __packed sctp_authhdr_t;
705 
706 typedef struct sctp_auth_chunk {
707         sctp_chunkhdr_t chunk_hdr;
708         sctp_authhdr_t auth_hdr;
709 } __packed sctp_auth_chunk_t;
710 
711 #endif /* __LINUX_SCTP_H__ */
712 

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