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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 struct sctphdr {
 61         __be16 source;
 62         __be16 dest;
 63         __be32 vtag;
 64         __le32 checksum;
 65 };
 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 struct sctp_chunkhdr {
 74         __u8 type;
 75         __u8 flags;
 76         __be16 length;
 77 };
 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 enum sctp_cid {
 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         /* sctp ndata 5.1. I-DATA */
106         SCTP_CID_I_DATA                 = 0x40,
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_I_FWD_TSN              = 0xC2,
114         SCTP_CID_ASCONF_ACK             = 0x80,
115         SCTP_CID_RECONF                 = 0x82,
116 }; /* enum */
117 
118 
119 /* Section 3.2
120  *  Chunk Types are encoded such that the highest-order two bits specify
121  *  the action that must be taken if the processing endpoint does not
122  *  recognize the Chunk Type.
123  */
124 enum {
125         SCTP_CID_ACTION_DISCARD     = 0x00,
126         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
127         SCTP_CID_ACTION_SKIP        = 0x80,
128         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
129 };
130 
131 enum { SCTP_CID_ACTION_MASK = 0xc0, };
132 
133 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
134  *
135  * 3.3.7 Abort Association (ABORT) (6):
136  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
137  *    If the sender did not have a TCB it should set this bit to 1.
138  */
139 enum { SCTP_CHUNK_FLAG_T = 0x01 };
140 
141 /*
142  *  Set the T bit
143  *
144  *      0                   1                   2                   3
145  *      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
146  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147  *     |   Type = 14   |Reserved     |T|      Length = 4               |
148  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149  *
150  * Chunk Flags: 8 bits
151  *
152  *   Reserved:  7 bits
153  *     Set to 0 on transmit and ignored on receipt.
154  *
155  *   T bit:  1 bit
156  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
157  *     the sender did NOT have a TCB it should set this bit to 1.
158  *
159  * Note: Special rules apply to this chunk for verification, please
160  * see Section 8.5.1 for details.
161  */
162 
163 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
164 
165 /* RFC 2960
166  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
167  */
168 
169 struct sctp_paramhdr {
170         __be16 type;
171         __be16 length;
172 };
173 
174 enum sctp_param {
175 
176         /* RFC 2960 Section 3.3.5 */
177         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
178         /* RFC 2960 Section 3.3.2.1 */
179         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
180         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
181         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
182         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
183         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
184         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
185         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
186         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
187 
188         /* AUTH Extension Section 3 */
189         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
190         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
191         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
192 
193         /* Add-IP: Supported Extensions, Section 4.2 */
194         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
195 
196         /* PR-SCTP Sec 3.1 */
197         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
198 
199         /* Add-IP Extension. Section 3.2 */
200         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
201         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
202         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
203         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
204         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
205         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
206 
207         /* RE-CONFIG. Section 4 */
208         SCTP_PARAM_RESET_OUT_REQUEST            = cpu_to_be16(0x000d),
209         SCTP_PARAM_RESET_IN_REQUEST             = cpu_to_be16(0x000e),
210         SCTP_PARAM_RESET_TSN_REQUEST            = cpu_to_be16(0x000f),
211         SCTP_PARAM_RESET_RESPONSE               = cpu_to_be16(0x0010),
212         SCTP_PARAM_RESET_ADD_OUT_STREAMS        = cpu_to_be16(0x0011),
213         SCTP_PARAM_RESET_ADD_IN_STREAMS         = cpu_to_be16(0x0012),
214 }; /* enum */
215 
216 
217 /* RFC 2960 Section 3.2.1
218  *  The Parameter Types are encoded such that the highest-order two bits
219  *  specify the action that must be taken if the processing endpoint does
220  *  not recognize the Parameter Type.
221  *
222  */
223 enum {
224         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
225         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
226         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
227         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
228 };
229 
230 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
231 
232 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
233 
234 struct sctp_datahdr {
235         __be32 tsn;
236         __be16 stream;
237         __be16 ssn;
238         __u32 ppid;
239         __u8  payload[0];
240 };
241 
242 struct sctp_data_chunk {
243         struct sctp_chunkhdr chunk_hdr;
244         struct sctp_datahdr data_hdr;
245 };
246 
247 struct sctp_idatahdr {
248         __be32 tsn;
249         __be16 stream;
250         __be16 reserved;
251         __be32 mid;
252         union {
253                 __u32 ppid;
254                 __be32 fsn;
255         };
256         __u8 payload[0];
257 };
258 
259 struct sctp_idata_chunk {
260         struct sctp_chunkhdr chunk_hdr;
261         struct sctp_idatahdr data_hdr;
262 };
263 
264 /* DATA Chuck Specific Flags */
265 enum {
266         SCTP_DATA_MIDDLE_FRAG   = 0x00,
267         SCTP_DATA_LAST_FRAG     = 0x01,
268         SCTP_DATA_FIRST_FRAG    = 0x02,
269         SCTP_DATA_NOT_FRAG      = 0x03,
270         SCTP_DATA_UNORDERED     = 0x04,
271         SCTP_DATA_SACK_IMM      = 0x08,
272 };
273 enum { SCTP_DATA_FRAG_MASK = 0x03, };
274 
275 
276 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
277  *
278  *  This chunk is used to initiate a SCTP association between two
279  *  endpoints.
280  */
281 struct sctp_inithdr {
282         __be32 init_tag;
283         __be32 a_rwnd;
284         __be16 num_outbound_streams;
285         __be16 num_inbound_streams;
286         __be32 initial_tsn;
287         __u8  params[0];
288 };
289 
290 struct sctp_init_chunk {
291         struct sctp_chunkhdr chunk_hdr;
292         struct sctp_inithdr init_hdr;
293 };
294 
295 
296 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
297 struct sctp_ipv4addr_param {
298         struct sctp_paramhdr param_hdr;
299         struct in_addr addr;
300 };
301 
302 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
303 struct sctp_ipv6addr_param {
304         struct sctp_paramhdr param_hdr;
305         struct in6_addr addr;
306 };
307 
308 /* Section 3.3.2.1 Cookie Preservative (9) */
309 struct sctp_cookie_preserve_param {
310         struct sctp_paramhdr param_hdr;
311         __be32 lifespan_increment;
312 };
313 
314 /* Section 3.3.2.1 Host Name Address (11) */
315 struct sctp_hostname_param {
316         struct sctp_paramhdr param_hdr;
317         uint8_t hostname[0];
318 };
319 
320 /* Section 3.3.2.1 Supported Address Types (12) */
321 struct sctp_supported_addrs_param {
322         struct sctp_paramhdr param_hdr;
323         __be16 types[0];
324 };
325 
326 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
327 struct sctp_adaptation_ind_param {
328         struct sctp_paramhdr param_hdr;
329         __be32 adaptation_ind;
330 };
331 
332 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
333 struct sctp_supported_ext_param {
334         struct sctp_paramhdr param_hdr;
335         __u8 chunks[0];
336 };
337 
338 /* AUTH Section 3.1 Random */
339 struct sctp_random_param {
340         struct sctp_paramhdr param_hdr;
341         __u8 random_val[0];
342 };
343 
344 /* AUTH Section 3.2 Chunk List */
345 struct sctp_chunks_param {
346         struct sctp_paramhdr param_hdr;
347         __u8 chunks[0];
348 };
349 
350 /* AUTH Section 3.3 HMAC Algorithm */
351 struct sctp_hmac_algo_param {
352         struct sctp_paramhdr param_hdr;
353         __be16 hmac_ids[0];
354 };
355 
356 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
357  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
358  *   association.
359  */
360 struct sctp_initack_chunk {
361         struct sctp_chunkhdr chunk_hdr;
362         struct sctp_inithdr init_hdr;
363 };
364 
365 /* Section 3.3.3.1 State Cookie (7) */
366 struct sctp_cookie_param {
367         struct sctp_paramhdr p;
368         __u8 body[0];
369 };
370 
371 /* Section 3.3.3.1 Unrecognized Parameters (8) */
372 struct sctp_unrecognized_param {
373         struct sctp_paramhdr param_hdr;
374         struct sctp_paramhdr unrecognized;
375 };
376 
377 
378 
379 /*
380  * 3.3.4 Selective Acknowledgement (SACK) (3):
381  *
382  *  This chunk is sent to the peer endpoint to acknowledge received DATA
383  *  chunks and to inform the peer endpoint of gaps in the received
384  *  subsequences of DATA chunks as represented by their TSNs.
385  */
386 
387 struct sctp_gap_ack_block {
388         __be16 start;
389         __be16 end;
390 };
391 
392 union sctp_sack_variable {
393         struct sctp_gap_ack_block gab;
394         __be32 dup;
395 };
396 
397 struct sctp_sackhdr {
398         __be32 cum_tsn_ack;
399         __be32 a_rwnd;
400         __be16 num_gap_ack_blocks;
401         __be16 num_dup_tsns;
402         union sctp_sack_variable variable[0];
403 };
404 
405 struct sctp_sack_chunk {
406         struct sctp_chunkhdr chunk_hdr;
407         struct sctp_sackhdr sack_hdr;
408 };
409 
410 
411 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
412  *
413  *  An endpoint should send this chunk to its peer endpoint to probe the
414  *  reachability of a particular destination transport address defined in
415  *  the present association.
416  */
417 
418 struct sctp_heartbeathdr {
419         struct sctp_paramhdr info;
420 };
421 
422 struct sctp_heartbeat_chunk {
423         struct sctp_chunkhdr chunk_hdr;
424         struct sctp_heartbeathdr hb_hdr;
425 };
426 
427 
428 /* For the abort and shutdown ACK we must carry the init tag in the
429  * common header. Just the common header is all that is needed with a
430  * chunk descriptor.
431  */
432 struct sctp_abort_chunk {
433         struct sctp_chunkhdr uh;
434 };
435 
436 
437 /* For the graceful shutdown we must carry the tag (in common header)
438  * and the highest consecutive acking value.
439  */
440 struct sctp_shutdownhdr {
441         __be32 cum_tsn_ack;
442 };
443 
444 struct sctp_shutdown_chunk {
445         struct sctp_chunkhdr chunk_hdr;
446         struct sctp_shutdownhdr shutdown_hdr;
447 };
448 
449 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
450 
451 struct sctp_errhdr {
452         __be16 cause;
453         __be16 length;
454         __u8  variable[0];
455 };
456 
457 struct sctp_operr_chunk {
458         struct sctp_chunkhdr chunk_hdr;
459         struct sctp_errhdr err_hdr;
460 };
461 
462 /* RFC 2960 3.3.10 - Operation Error
463  *
464  * Cause Code: 16 bits (unsigned integer)
465  *
466  *     Defines the type of error conditions being reported.
467  *    Cause Code
468  *     Value           Cause Code
469  *     ---------      ----------------
470  *      1              Invalid Stream Identifier
471  *      2              Missing Mandatory Parameter
472  *      3              Stale Cookie Error
473  *      4              Out of Resource
474  *      5              Unresolvable Address
475  *      6              Unrecognized Chunk Type
476  *      7              Invalid Mandatory Parameter
477  *      8              Unrecognized Parameters
478  *      9              No User Data
479  *     10              Cookie Received While Shutting Down
480  */
481 enum sctp_error {
482 
483         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
484         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
485         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
486         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
487         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
488         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
489         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
490         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
491         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
492         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
493         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
494 
495 
496         /* SCTP Implementation Guide:
497          *  11  Restart of an association with new addresses
498          *  12  User Initiated Abort
499          *  13  Protocol Violation
500          */
501 
502         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
503         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
504         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
505 
506         /* ADDIP Section 3.3  New Error Causes
507          *
508          * Four new Error Causes are added to the SCTP Operational Errors,
509          * primarily for use in the ASCONF-ACK chunk.
510          *
511          * Value          Cause Code
512          * ---------      ----------------
513          * 0x00A0          Request to Delete Last Remaining IP Address.
514          * 0x00A1          Operation Refused Due to Resource Shortage.
515          * 0x00A2          Request to Delete Source IP Address.
516          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
517          * 0x00A4          Request refused - no authorization.
518          */
519         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
520         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
521         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
522         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
523         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
524 
525         /* AUTH Section 4.  New Error Cause
526          *
527          * This section defines a new error cause that will be sent if an AUTH
528          * chunk is received with an unsupported HMAC identifier.
529          * illustrates the new error cause.
530          *
531          * Cause Code      Error Cause Name
532          * --------------------------------------------------------------
533          * 0x0105          Unsupported HMAC Identifier
534          */
535          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
536 };
537 
538 
539 
540 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
541  *   Explicit Congestion Notification Echo (ECNE) (12)
542  */
543 struct sctp_ecnehdr {
544         __be32 lowest_tsn;
545 };
546 
547 struct sctp_ecne_chunk {
548         struct sctp_chunkhdr chunk_hdr;
549         struct sctp_ecnehdr ence_hdr;
550 };
551 
552 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
553  *   Congestion Window Reduced (CWR) (13)
554  */
555 struct sctp_cwrhdr {
556         __be32 lowest_tsn;
557 };
558 
559 /* PR-SCTP
560  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
561  *
562  * Forward Cumulative TSN chunk has the following format:
563  *
564  *        0                   1                   2                   3
565  *        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
566  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
567  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
568  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
569  *      |                      New Cumulative TSN                       |
570  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
571  *      |         Stream-1              |       Stream Sequence-1       |
572  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
573  *      \                                                               /
574  *      /                                                               \
575  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
576  *      |         Stream-N              |       Stream Sequence-N       |
577  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
578  *
579  *      Chunk Flags:
580  *
581  *        Set to all zeros on transmit and ignored on receipt.
582  *
583  *      New Cumulative TSN: 32 bit u_int
584  *
585  *       This indicates the new cumulative TSN to the data receiver. Upon
586  *       the reception of this value, the data receiver MUST consider
587  *       any missing TSNs earlier than or equal to this value as received
588  *       and stop reporting them as gaps in any subsequent SACKs.
589  *
590  *      Stream-N: 16 bit u_int
591  *
592  *       This field holds a stream number that was skipped by this
593  *       FWD-TSN.
594  *
595  *      Stream Sequence-N: 16 bit u_int
596  *       This field holds the sequence number associated with the stream
597  *       that was skipped. The stream sequence field holds the largest stream
598  *       sequence number in this stream being skipped.  The receiver of
599  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
600  *       to enable delivery of any stranded TSN's that remain on the stream
601  *       re-ordering queues. This field MUST NOT report TSN's corresponding
602  *       to DATA chunk that are marked as unordered. For ordered DATA
603  *       chunks this field MUST be filled in.
604  */
605 struct sctp_fwdtsn_skip {
606         __be16 stream;
607         __be16 ssn;
608 };
609 
610 struct sctp_fwdtsn_hdr {
611         __be32 new_cum_tsn;
612         struct sctp_fwdtsn_skip skip[0];
613 };
614 
615 struct sctp_fwdtsn_chunk {
616         struct sctp_chunkhdr chunk_hdr;
617         struct sctp_fwdtsn_hdr fwdtsn_hdr;
618 };
619 
620 struct sctp_ifwdtsn_skip {
621         __be16 stream;
622         __u8 reserved;
623         __u8 flags;
624         __be32 mid;
625 };
626 
627 struct sctp_ifwdtsn_hdr {
628         __be32 new_cum_tsn;
629         struct sctp_ifwdtsn_skip skip[0];
630 };
631 
632 struct sctp_ifwdtsn_chunk {
633         struct sctp_chunkhdr chunk_hdr;
634         struct sctp_ifwdtsn_hdr fwdtsn_hdr;
635 };
636 
637 /* ADDIP
638  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
639  *
640  *      Serial Number: 32 bits (unsigned integer)
641  *      This value represents a Serial Number for the ASCONF Chunk. The
642  *      valid range of Serial Number is from 0 to 2^32-1.
643  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
644  *
645  *      Address Parameter: 8 or 20 bytes (depending on type)
646  *      The address is an address of the sender of the ASCONF chunk,
647  *      the address MUST be considered part of the association by the
648  *      peer endpoint. This field may be used by the receiver of the 
649  *      ASCONF to help in finding the association. This parameter MUST
650  *      be present in every ASCONF message i.e. it is a mandatory TLV
651  *      parameter.
652  *
653  *      ASCONF Parameter: TLV format
654  *      Each Address configuration change is represented by a TLV
655  *      parameter as defined in Section 3.2. One or more requests may
656  *      be present in an ASCONF Chunk.
657  *
658  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
659  * 
660  *      Serial Number: 32 bits (unsigned integer)
661  *      This value represents the Serial Number for the received ASCONF
662  *      Chunk that is acknowledged by this chunk. This value is copied
663  *      from the received ASCONF Chunk. 
664  *
665  *      ASCONF Parameter Response: TLV format
666  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
667  *      report status of ASCONF processing.
668  */
669 struct sctp_addip_param {
670         struct sctp_paramhdr param_hdr;
671         __be32 crr_id;
672 };
673 
674 struct sctp_addiphdr {
675         __be32  serial;
676         __u8    params[0];
677 };
678 
679 struct sctp_addip_chunk {
680         struct sctp_chunkhdr chunk_hdr;
681         struct sctp_addiphdr addip_hdr;
682 };
683 
684 /* AUTH
685  * Section 4.1  Authentication Chunk (AUTH)
686  *
687  *   This chunk is used to hold the result of the HMAC calculation.
688  *
689  *    0                   1                   2                   3
690  *    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
691  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
692  *   | Type = 0x0F   |   Flags=0     |             Length            |
693  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
694  *   |     Shared Key Identifier     |   HMAC Identifier             |
695  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
696  *   |                                                               |
697  *   \                             HMAC                              /
698  *   /                                                               \
699  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
700  *
701  *   Type: 1 byte (unsigned integer)
702  *      This value MUST be set to 0x0F for  all AUTH-chunks.
703  *
704  *   Flags: 1 byte (unsigned integer)
705  *      Set to zero on transmit and ignored on receipt.
706  *
707  *   Length: 2 bytes (unsigned integer)
708  *      This value holds the length of the HMAC in bytes plus 8.
709  *
710  *  Shared Key Identifier: 2 bytes (unsigned integer)
711  *      This value describes which endpoint pair shared key is used.
712  *
713  *   HMAC Identifier: 2 bytes (unsigned integer)
714  *      This value describes which message digest is being used.  Table 2
715  *      shows the currently defined values.
716  *
717  *    The following Table 2 shows the currently defined values for HMAC
718  *       identifiers.
719  *
720  *       +-----------------+--------------------------+
721  *       | HMAC Identifier | Message Digest Algorithm |
722  *       +-----------------+--------------------------+
723  *       | 0               | Reserved                 |
724  *       | 1               | SHA-1 defined in [8]     |
725  *       | 2               | Reserved                 |
726  *       | 3               | SHA-256 defined in [8]   |
727  *       +-----------------+--------------------------+
728  *
729  *
730  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
731  *      calculation.
732  */
733 struct sctp_authhdr {
734         __be16 shkey_id;
735         __be16 hmac_id;
736         __u8   hmac[0];
737 };
738 
739 struct sctp_auth_chunk {
740         struct sctp_chunkhdr chunk_hdr;
741         struct sctp_authhdr auth_hdr;
742 };
743 
744 struct sctp_infox {
745         struct sctp_info *sctpinfo;
746         struct sctp_association *asoc;
747 };
748 
749 struct sctp_reconf_chunk {
750         struct sctp_chunkhdr chunk_hdr;
751         __u8 params[0];
752 };
753 
754 struct sctp_strreset_outreq {
755         struct sctp_paramhdr param_hdr;
756         __be32 request_seq;
757         __be32 response_seq;
758         __be32 send_reset_at_tsn;
759         __be16 list_of_streams[0];
760 };
761 
762 struct sctp_strreset_inreq {
763         struct sctp_paramhdr param_hdr;
764         __be32 request_seq;
765         __be16 list_of_streams[0];
766 };
767 
768 struct sctp_strreset_tsnreq {
769         struct sctp_paramhdr param_hdr;
770         __be32 request_seq;
771 };
772 
773 struct sctp_strreset_addstrm {
774         struct sctp_paramhdr param_hdr;
775         __be32 request_seq;
776         __be16 number_of_streams;
777         __be16 reserved;
778 };
779 
780 enum {
781         SCTP_STRRESET_NOTHING_TO_DO     = 0x00,
782         SCTP_STRRESET_PERFORMED         = 0x01,
783         SCTP_STRRESET_DENIED            = 0x02,
784         SCTP_STRRESET_ERR_WRONG_SSN     = 0x03,
785         SCTP_STRRESET_ERR_IN_PROGRESS   = 0x04,
786         SCTP_STRRESET_ERR_BAD_SEQNO     = 0x05,
787         SCTP_STRRESET_IN_PROGRESS       = 0x06,
788 };
789 
790 struct sctp_strreset_resp {
791         struct sctp_paramhdr param_hdr;
792         __be32 response_seq;
793         __be32 result;
794 };
795 
796 struct sctp_strreset_resptsn {
797         struct sctp_paramhdr param_hdr;
798         __be32 response_seq;
799         __be32 result;
800         __be32 senders_next_tsn;
801         __be32 receivers_next_tsn;
802 };
803 
804 enum {
805         SCTP_DSCP_SET_MASK = 0x1,
806         SCTP_DSCP_VAL_MASK = 0xfc,
807         SCTP_FLOWLABEL_SET_MASK = 0x100000,
808         SCTP_FLOWLABEL_VAL_MASK = 0xfffff
809 };
810 
811 #endif /* __LINUX_SCTP_H__ */
812 

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