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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, see
 27  * <http://www.gnu.org/licenses/>.
 28  *
 29  * Please send any bug reports or fixes you make to the
 30  * email address(es):
 31  *    lksctp developers <linux-sctp@vger.kernel.org>
 32  *
 33  * Or submit a bug report through the following website:
 34  *    http://www.sf.net/projects/lksctp
 35  *
 36  * Written or modified by:
 37  *    La Monte H.P. Yarroll <piggy@acm.org>
 38  *    Karl Knutson <karl@athena.chicago.il.us>
 39  *    Jon Grimm <jgrimm@us.ibm.com>
 40  *    Xingang Guo <xingang.guo@intel.com>
 41  *    randall@sctp.chicago.il.us
 42  *    kmorneau@cisco.com
 43  *    qxie1@email.mot.com
 44  *    Sridhar Samudrala <sri@us.ibm.com>
 45  *    Kevin Gao <kevin.gao@intel.com>
 46  *
 47  * Any bugs reported given to us we will try to fix... any fixes shared will
 48  * be incorporated into the next SCTP release.
 49  */
 50 #ifndef __LINUX_SCTP_H__
 51 #define __LINUX_SCTP_H__
 52 
 53 #include <linux/in.h>           /* We need in_addr.  */
 54 #include <linux/in6.h>          /* We need in6_addr.  */
 55 #include <linux/skbuff.h>
 56 
 57 #include <uapi/linux/sctp.h>
 58 
 59 /* Section 3.1.  SCTP Common Header Format */
 60 typedef struct sctphdr {
 61         __be16 source;
 62         __be16 dest;
 63         __be32 vtag;
 64         __le32 checksum;
 65 } sctp_sctphdr_t;
 66 
 67 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
 68 {
 69         return (struct sctphdr *)skb_transport_header(skb);
 70 }
 71 
 72 /* Section 3.2.  Chunk Field Descriptions. */
 73 typedef struct sctp_chunkhdr {
 74         __u8 type;
 75         __u8 flags;
 76         __be16 length;
 77 } sctp_chunkhdr_t;
 78 
 79 
 80 /* Section 3.2.  Chunk Type Values.
 81  * [Chunk Type] identifies the type of information contained in the Chunk
 82  * Value field. It takes a value from 0 to 254. The value of 255 is
 83  * reserved for future use as an extension field.
 84  */
 85 typedef enum {
 86         SCTP_CID_DATA                   = 0,
 87         SCTP_CID_INIT                   = 1,
 88         SCTP_CID_INIT_ACK               = 2,
 89         SCTP_CID_SACK                   = 3,
 90         SCTP_CID_HEARTBEAT              = 4,
 91         SCTP_CID_HEARTBEAT_ACK          = 5,
 92         SCTP_CID_ABORT                  = 6,
 93         SCTP_CID_SHUTDOWN               = 7,
 94         SCTP_CID_SHUTDOWN_ACK           = 8,
 95         SCTP_CID_ERROR                  = 9,
 96         SCTP_CID_COOKIE_ECHO            = 10,
 97         SCTP_CID_COOKIE_ACK             = 11,
 98         SCTP_CID_ECN_ECNE               = 12,
 99         SCTP_CID_ECN_CWR                = 13,
100         SCTP_CID_SHUTDOWN_COMPLETE      = 14,
101 
102         /* AUTH Extension Section 4.1 */
103         SCTP_CID_AUTH                   = 0x0F,
104 
105         /* PR-SCTP Sec 3.2 */
106         SCTP_CID_FWD_TSN                = 0xC0,
107 
108         /* Use hex, as defined in ADDIP sec. 3.1 */
109         SCTP_CID_ASCONF                 = 0xC1,
110         SCTP_CID_ASCONF_ACK             = 0x80,
111         SCTP_CID_RECONF                 = 0x82,
112 } sctp_cid_t; /* enum */
113 
114 
115 /* Section 3.2
116  *  Chunk Types are encoded such that the highest-order two bits specify
117  *  the action that must be taken if the processing endpoint does not
118  *  recognize the Chunk Type.
119  */
120 typedef enum {
121         SCTP_CID_ACTION_DISCARD     = 0x00,
122         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
123         SCTP_CID_ACTION_SKIP        = 0x80,
124         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
125 } sctp_cid_action_t;
126 
127 enum { SCTP_CID_ACTION_MASK = 0xc0, };
128 
129 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
130  *
131  * 3.3.7 Abort Association (ABORT) (6):
132  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
133  *    If the sender did not have a TCB it should set this bit to 1.
134  */
135 enum { SCTP_CHUNK_FLAG_T = 0x01 };
136 
137 /*
138  *  Set the T bit
139  *
140  *      0                   1                   2                   3
141  *      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
142  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143  *     |   Type = 14   |Reserved     |T|      Length = 4               |
144  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145  *
146  * Chunk Flags: 8 bits
147  *
148  *   Reserved:  7 bits
149  *     Set to 0 on transmit and ignored on receipt.
150  *
151  *   T bit:  1 bit
152  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
153  *     the sender did NOT have a TCB it should set this bit to 1.
154  *
155  * Note: Special rules apply to this chunk for verification, please
156  * see Section 8.5.1 for details.
157  */
158 
159 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
160 
161 /* RFC 2960
162  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
163  */
164 
165 typedef struct sctp_paramhdr {
166         __be16 type;
167         __be16 length;
168 } sctp_paramhdr_t;
169 
170 typedef enum {
171 
172         /* RFC 2960 Section 3.3.5 */
173         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
174         /* RFC 2960 Section 3.3.2.1 */
175         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
176         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
177         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
178         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
179         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
180         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
181         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
182         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
183 
184         /* AUTH Extension Section 3 */
185         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
186         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
187         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
188 
189         /* Add-IP: Supported Extensions, Section 4.2 */
190         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
191 
192         /* PR-SCTP Sec 3.1 */
193         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
194 
195         /* Add-IP Extension. Section 3.2 */
196         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
197         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
198         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
199         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
200         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
201         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
202 
203         /* RE-CONFIG. Section 4 */
204         SCTP_PARAM_RESET_OUT_REQUEST            = cpu_to_be16(0x000d),
205         SCTP_PARAM_RESET_IN_REQUEST             = cpu_to_be16(0x000e),
206         SCTP_PARAM_RESET_TSN_REQUEST            = cpu_to_be16(0x000f),
207         SCTP_PARAM_RESET_RESPONSE               = cpu_to_be16(0x0010),
208         SCTP_PARAM_RESET_ADD_OUT_STREAMS        = cpu_to_be16(0x0011),
209         SCTP_PARAM_RESET_ADD_IN_STREAMS         = cpu_to_be16(0x0012),
210 } sctp_param_t; /* enum */
211 
212 
213 /* RFC 2960 Section 3.2.1
214  *  The Parameter Types are encoded such that the highest-order two bits
215  *  specify the action that must be taken if the processing endpoint does
216  *  not recognize the Parameter Type.
217  *
218  */
219 typedef enum {
220         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
221         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
222         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
223         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
224 } sctp_param_action_t;
225 
226 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
227 
228 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
229 
230 typedef struct sctp_datahdr {
231         __be32 tsn;
232         __be16 stream;
233         __be16 ssn;
234         __be32 ppid;
235         __u8  payload[0];
236 } sctp_datahdr_t;
237 
238 typedef struct sctp_data_chunk {
239         sctp_chunkhdr_t chunk_hdr;
240         sctp_datahdr_t  data_hdr;
241 } sctp_data_chunk_t;
242 
243 /* DATA Chuck Specific Flags */
244 enum {
245         SCTP_DATA_MIDDLE_FRAG   = 0x00,
246         SCTP_DATA_LAST_FRAG     = 0x01,
247         SCTP_DATA_FIRST_FRAG    = 0x02,
248         SCTP_DATA_NOT_FRAG      = 0x03,
249         SCTP_DATA_UNORDERED     = 0x04,
250         SCTP_DATA_SACK_IMM      = 0x08,
251 };
252 enum { SCTP_DATA_FRAG_MASK = 0x03, };
253 
254 
255 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
256  *
257  *  This chunk is used to initiate a SCTP association between two
258  *  endpoints.
259  */
260 typedef struct sctp_inithdr {
261         __be32 init_tag;
262         __be32 a_rwnd;
263         __be16 num_outbound_streams;
264         __be16 num_inbound_streams;
265         __be32 initial_tsn;
266         __u8  params[0];
267 } sctp_inithdr_t;
268 
269 typedef struct sctp_init_chunk {
270         sctp_chunkhdr_t chunk_hdr;
271         sctp_inithdr_t init_hdr;
272 } sctp_init_chunk_t;
273 
274 
275 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
276 typedef struct sctp_ipv4addr_param {
277         sctp_paramhdr_t param_hdr;
278         struct in_addr  addr;
279 } sctp_ipv4addr_param_t;
280 
281 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
282 typedef struct sctp_ipv6addr_param {
283         sctp_paramhdr_t param_hdr;
284         struct in6_addr addr;
285 } sctp_ipv6addr_param_t;
286 
287 /* Section 3.3.2.1 Cookie Preservative (9) */
288 typedef struct sctp_cookie_preserve_param {
289         sctp_paramhdr_t param_hdr;
290         __be32          lifespan_increment;
291 } sctp_cookie_preserve_param_t;
292 
293 /* Section 3.3.2.1 Host Name Address (11) */
294 typedef struct sctp_hostname_param {
295         sctp_paramhdr_t param_hdr;
296         uint8_t hostname[0];
297 } sctp_hostname_param_t;
298 
299 /* Section 3.3.2.1 Supported Address Types (12) */
300 typedef struct sctp_supported_addrs_param {
301         sctp_paramhdr_t param_hdr;
302         __be16 types[0];
303 } sctp_supported_addrs_param_t;
304 
305 /* Appendix A. ECN Capable (32768) */
306 typedef struct sctp_ecn_capable_param {
307         sctp_paramhdr_t param_hdr;
308 } sctp_ecn_capable_param_t;
309 
310 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
311 typedef struct sctp_adaptation_ind_param {
312         struct sctp_paramhdr param_hdr;
313         __be32 adaptation_ind;
314 } sctp_adaptation_ind_param_t;
315 
316 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
317 typedef struct sctp_supported_ext_param {
318         struct sctp_paramhdr param_hdr;
319         __u8 chunks[0];
320 } sctp_supported_ext_param_t;
321 
322 /* AUTH Section 3.1 Random */
323 typedef struct sctp_random_param {
324         sctp_paramhdr_t param_hdr;
325         __u8 random_val[0];
326 } sctp_random_param_t;
327 
328 /* AUTH Section 3.2 Chunk List */
329 typedef struct sctp_chunks_param {
330         sctp_paramhdr_t param_hdr;
331         __u8 chunks[0];
332 } sctp_chunks_param_t;
333 
334 /* AUTH Section 3.3 HMAC Algorithm */
335 typedef struct sctp_hmac_algo_param {
336         sctp_paramhdr_t param_hdr;
337         __be16 hmac_ids[0];
338 } sctp_hmac_algo_param_t;
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  */
344 typedef sctp_init_chunk_t sctp_initack_chunk_t;
345 
346 /* Section 3.3.3.1 State Cookie (7) */
347 typedef struct sctp_cookie_param {
348         sctp_paramhdr_t p;
349         __u8 body[0];
350 } sctp_cookie_param_t;
351 
352 /* Section 3.3.3.1 Unrecognized Parameters (8) */
353 typedef struct sctp_unrecognized_param {
354         sctp_paramhdr_t param_hdr;
355         sctp_paramhdr_t unrecognized;
356 } sctp_unrecognized_param_t;
357 
358 
359 
360 /*
361  * 3.3.4 Selective Acknowledgement (SACK) (3):
362  *
363  *  This chunk is sent to the peer endpoint to acknowledge received DATA
364  *  chunks and to inform the peer endpoint of gaps in the received
365  *  subsequences of DATA chunks as represented by their TSNs.
366  */
367 
368 typedef struct sctp_gap_ack_block {
369         __be16 start;
370         __be16 end;
371 } sctp_gap_ack_block_t;
372 
373 typedef __be32 sctp_dup_tsn_t;
374 
375 typedef union {
376         sctp_gap_ack_block_t    gab;
377         sctp_dup_tsn_t          dup;
378 } sctp_sack_variable_t;
379 
380 typedef struct sctp_sackhdr {
381         __be32 cum_tsn_ack;
382         __be32 a_rwnd;
383         __be16 num_gap_ack_blocks;
384         __be16 num_dup_tsns;
385         sctp_sack_variable_t variable[0];
386 } sctp_sackhdr_t;
387 
388 typedef struct sctp_sack_chunk {
389         sctp_chunkhdr_t chunk_hdr;
390         sctp_sackhdr_t sack_hdr;
391 } sctp_sack_chunk_t;
392 
393 
394 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
395  *
396  *  An endpoint should send this chunk to its peer endpoint to probe the
397  *  reachability of a particular destination transport address defined in
398  *  the present association.
399  */
400 
401 typedef struct sctp_heartbeathdr {
402         sctp_paramhdr_t info;
403 } sctp_heartbeathdr_t;
404 
405 typedef struct sctp_heartbeat_chunk {
406         sctp_chunkhdr_t chunk_hdr;
407         sctp_heartbeathdr_t hb_hdr;
408 } sctp_heartbeat_chunk_t;
409 
410 
411 /* For the abort and shutdown ACK we must carry the init tag in the
412  * common header. Just the common header is all that is needed with a
413  * chunk descriptor.
414  */
415 typedef struct sctp_abort_chunk {
416         sctp_chunkhdr_t uh;
417 } sctp_abort_chunk_t;
418 
419 
420 /* For the graceful shutdown we must carry the tag (in common header)
421  * and the highest consecutive acking value.
422  */
423 typedef struct sctp_shutdownhdr {
424         __be32 cum_tsn_ack;
425 } sctp_shutdownhdr_t;
426 
427 struct sctp_shutdown_chunk_t {
428         sctp_chunkhdr_t    chunk_hdr;
429         sctp_shutdownhdr_t shutdown_hdr;
430 };
431 
432 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
433 
434 typedef struct sctp_errhdr {
435         __be16 cause;
436         __be16 length;
437         __u8  variable[0];
438 } sctp_errhdr_t;
439 
440 typedef struct sctp_operr_chunk {
441         sctp_chunkhdr_t chunk_hdr;
442         sctp_errhdr_t   err_hdr;
443 } sctp_operr_chunk_t;
444 
445 /* RFC 2960 3.3.10 - Operation Error
446  *
447  * Cause Code: 16 bits (unsigned integer)
448  *
449  *     Defines the type of error conditions being reported.
450  *    Cause Code
451  *     Value           Cause Code
452  *     ---------      ----------------
453  *      1              Invalid Stream Identifier
454  *      2              Missing Mandatory Parameter
455  *      3              Stale Cookie Error
456  *      4              Out of Resource
457  *      5              Unresolvable Address
458  *      6              Unrecognized Chunk Type
459  *      7              Invalid Mandatory Parameter
460  *      8              Unrecognized Parameters
461  *      9              No User Data
462  *     10              Cookie Received While Shutting Down
463  */
464 typedef enum {
465 
466         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
467         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
468         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
469         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
470         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
471         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
472         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
473         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
474         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
475         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
476         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
477 
478 
479         /* SCTP Implementation Guide:
480          *  11  Restart of an association with new addresses
481          *  12  User Initiated Abort
482          *  13  Protocol Violation
483          */
484 
485         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
486         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
487         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
488 
489         /* ADDIP Section 3.3  New Error Causes
490          *
491          * Four new Error Causes are added to the SCTP Operational Errors,
492          * primarily for use in the ASCONF-ACK chunk.
493          *
494          * Value          Cause Code
495          * ---------      ----------------
496          * 0x00A0          Request to Delete Last Remaining IP Address.
497          * 0x00A1          Operation Refused Due to Resource Shortage.
498          * 0x00A2          Request to Delete Source IP Address.
499          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
500          * 0x00A4          Request refused - no authorization.
501          */
502         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
503         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
504         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
505         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
506         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
507 
508         /* AUTH Section 4.  New Error Cause
509          *
510          * This section defines a new error cause that will be sent if an AUTH
511          * chunk is received with an unsupported HMAC identifier.
512          * illustrates the new error cause.
513          *
514          * Cause Code      Error Cause Name
515          * --------------------------------------------------------------
516          * 0x0105          Unsupported HMAC Identifier
517          */
518          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
519 } sctp_error_t;
520 
521 
522 
523 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
524  *   Explicit Congestion Notification Echo (ECNE) (12)
525  */
526 typedef struct sctp_ecnehdr {
527         __be32 lowest_tsn;
528 } sctp_ecnehdr_t;
529 
530 typedef struct sctp_ecne_chunk {
531         sctp_chunkhdr_t chunk_hdr;
532         sctp_ecnehdr_t ence_hdr;
533 } sctp_ecne_chunk_t;
534 
535 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
536  *   Congestion Window Reduced (CWR) (13)
537  */
538 typedef struct sctp_cwrhdr {
539         __be32 lowest_tsn;
540 } sctp_cwrhdr_t;
541 
542 typedef struct sctp_cwr_chunk {
543         sctp_chunkhdr_t chunk_hdr;
544         sctp_cwrhdr_t cwr_hdr;
545 } sctp_cwr_chunk_t;
546 
547 /* PR-SCTP
548  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
549  *
550  * Forward Cumulative TSN chunk has the following format:
551  *
552  *        0                   1                   2                   3
553  *        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
554  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
556  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557  *      |                      New Cumulative TSN                       |
558  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559  *      |         Stream-1              |       Stream Sequence-1       |
560  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561  *      \                                                               /
562  *      /                                                               \
563  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
564  *      |         Stream-N              |       Stream Sequence-N       |
565  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
566  *
567  *      Chunk Flags:
568  *
569  *        Set to all zeros on transmit and ignored on receipt.
570  *
571  *      New Cumulative TSN: 32 bit u_int
572  *
573  *       This indicates the new cumulative TSN to the data receiver. Upon
574  *       the reception of this value, the data receiver MUST consider
575  *       any missing TSNs earlier than or equal to this value as received
576  *       and stop reporting them as gaps in any subsequent SACKs.
577  *
578  *      Stream-N: 16 bit u_int
579  *
580  *       This field holds a stream number that was skipped by this
581  *       FWD-TSN.
582  *
583  *      Stream Sequence-N: 16 bit u_int
584  *       This field holds the sequence number associated with the stream
585  *       that was skipped. The stream sequence field holds the largest stream
586  *       sequence number in this stream being skipped.  The receiver of
587  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
588  *       to enable delivery of any stranded TSN's that remain on the stream
589  *       re-ordering queues. This field MUST NOT report TSN's corresponding
590  *       to DATA chunk that are marked as unordered. For ordered DATA
591  *       chunks this field MUST be filled in.
592  */
593 struct sctp_fwdtsn_skip {
594         __be16 stream;
595         __be16 ssn;
596 };
597 
598 struct sctp_fwdtsn_hdr {
599         __be32 new_cum_tsn;
600         struct sctp_fwdtsn_skip skip[0];
601 };
602 
603 struct sctp_fwdtsn_chunk {
604         struct sctp_chunkhdr chunk_hdr;
605         struct sctp_fwdtsn_hdr fwdtsn_hdr;
606 };
607 
608 
609 /* ADDIP
610  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
611  *
612  *      Serial Number: 32 bits (unsigned integer)
613  *      This value represents a Serial Number for the ASCONF Chunk. The
614  *      valid range of Serial Number is from 0 to 2^32-1.
615  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
616  *
617  *      Address Parameter: 8 or 20 bytes (depending on type)
618  *      The address is an address of the sender of the ASCONF chunk,
619  *      the address MUST be considered part of the association by the
620  *      peer endpoint. This field may be used by the receiver of the 
621  *      ASCONF to help in finding the association. This parameter MUST
622  *      be present in every ASCONF message i.e. it is a mandatory TLV
623  *      parameter.
624  *
625  *      ASCONF Parameter: TLV format
626  *      Each Address configuration change is represented by a TLV
627  *      parameter as defined in Section 3.2. One or more requests may
628  *      be present in an ASCONF Chunk.
629  *
630  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
631  * 
632  *      Serial Number: 32 bits (unsigned integer)
633  *      This value represents the Serial Number for the received ASCONF
634  *      Chunk that is acknowledged by this chunk. This value is copied
635  *      from the received ASCONF Chunk. 
636  *
637  *      ASCONF Parameter Response: TLV format
638  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
639  *      report status of ASCONF processing.
640  */
641 typedef struct sctp_addip_param {
642         sctp_paramhdr_t param_hdr;
643         __be32          crr_id;
644 } sctp_addip_param_t;
645 
646 typedef struct sctp_addiphdr {
647         __be32  serial;
648         __u8    params[0];
649 } sctp_addiphdr_t;
650 
651 typedef struct sctp_addip_chunk {
652         sctp_chunkhdr_t chunk_hdr;
653         sctp_addiphdr_t addip_hdr;
654 } sctp_addip_chunk_t;
655 
656 /* AUTH
657  * Section 4.1  Authentication Chunk (AUTH)
658  *
659  *   This chunk is used to hold the result of the HMAC calculation.
660  *
661  *    0                   1                   2                   3
662  *    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
663  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664  *   | Type = 0x0F   |   Flags=0     |             Length            |
665  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
666  *   |     Shared Key Identifier     |   HMAC Identifier             |
667  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
668  *   |                                                               |
669  *   \                             HMAC                              /
670  *   /                                                               \
671  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
672  *
673  *   Type: 1 byte (unsigned integer)
674  *      This value MUST be set to 0x0F for  all AUTH-chunks.
675  *
676  *   Flags: 1 byte (unsigned integer)
677  *      Set to zero on transmit and ignored on receipt.
678  *
679  *   Length: 2 bytes (unsigned integer)
680  *      This value holds the length of the HMAC in bytes plus 8.
681  *
682  *  Shared Key Identifier: 2 bytes (unsigned integer)
683  *      This value describes which endpoint pair shared key is used.
684  *
685  *   HMAC Identifier: 2 bytes (unsigned integer)
686  *      This value describes which message digest is being used.  Table 2
687  *      shows the currently defined values.
688  *
689  *    The following Table 2 shows the currently defined values for HMAC
690  *       identifiers.
691  *
692  *       +-----------------+--------------------------+
693  *       | HMAC Identifier | Message Digest Algorithm |
694  *       +-----------------+--------------------------+
695  *       | 0               | Reserved                 |
696  *       | 1               | SHA-1 defined in [8]     |
697  *       | 2               | Reserved                 |
698  *       | 3               | SHA-256 defined in [8]   |
699  *       +-----------------+--------------------------+
700  *
701  *
702  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
703  *      calculation.
704  */
705 typedef struct sctp_authhdr {
706         __be16 shkey_id;
707         __be16 hmac_id;
708         __u8   hmac[0];
709 } sctp_authhdr_t;
710 
711 typedef struct sctp_auth_chunk {
712         sctp_chunkhdr_t chunk_hdr;
713         sctp_authhdr_t auth_hdr;
714 } sctp_auth_chunk_t;
715 
716 struct sctp_infox {
717         struct sctp_info *sctpinfo;
718         struct sctp_association *asoc;
719 };
720 
721 struct sctp_reconf_chunk {
722         sctp_chunkhdr_t chunk_hdr;
723         __u8 params[0];
724 };
725 
726 struct sctp_strreset_outreq {
727         sctp_paramhdr_t param_hdr;
728         __u32 request_seq;
729         __u32 response_seq;
730         __u32 send_reset_at_tsn;
731         __u16 list_of_streams[0];
732 };
733 
734 struct sctp_strreset_inreq {
735         sctp_paramhdr_t param_hdr;
736         __u32 request_seq;
737         __u16 list_of_streams[0];
738 };
739 
740 struct sctp_strreset_tsnreq {
741         sctp_paramhdr_t param_hdr;
742         __u32 request_seq;
743 };
744 
745 struct sctp_strreset_addstrm {
746         sctp_paramhdr_t param_hdr;
747         __u32 request_seq;
748         __u16 number_of_streams;
749         __u16 reserved;
750 };
751 
752 enum {
753         SCTP_STRRESET_NOTHING_TO_DO     = 0x00,
754         SCTP_STRRESET_PERFORMED         = 0x01,
755         SCTP_STRRESET_DENIED            = 0x02,
756         SCTP_STRRESET_ERR_WRONG_SSN     = 0x03,
757         SCTP_STRRESET_ERR_IN_PROGRESS   = 0x04,
758         SCTP_STRRESET_ERR_BAD_SEQNO     = 0x05,
759         SCTP_STRRESET_IN_PROGRESS       = 0x06,
760 };
761 
762 struct sctp_strreset_resp {
763         sctp_paramhdr_t param_hdr;
764         __u32 response_seq;
765         __u32 result;
766 };
767 
768 struct sctp_strreset_resptsn {
769         sctp_paramhdr_t param_hdr;
770         __u32 response_seq;
771         __u32 result;
772         __u32 senders_next_tsn;
773         __u32 receivers_next_tsn;
774 };
775 
776 #endif /* __LINUX_SCTP_H__ */
777 

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