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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 #include <linux/skbuff.h>
 57 
 58 #include <uapi/linux/sctp.h>
 59 
 60 /* Section 3.1.  SCTP Common Header Format */
 61 typedef struct sctphdr {
 62         __be16 source;
 63         __be16 dest;
 64         __be32 vtag;
 65         __le32 checksum;
 66 } __packed sctp_sctphdr_t;
 67 
 68 static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
 69 {
 70         return (struct sctphdr *)skb_transport_header(skb);
 71 }
 72 
 73 /* Section 3.2.  Chunk Field Descriptions. */
 74 typedef struct sctp_chunkhdr {
 75         __u8 type;
 76         __u8 flags;
 77         __be16 length;
 78 } __packed sctp_chunkhdr_t;
 79 
 80 
 81 /* Section 3.2.  Chunk Type Values.
 82  * [Chunk Type] identifies the type of information contained in the Chunk
 83  * Value field. It takes a value from 0 to 254. The value of 255 is
 84  * reserved for future use as an extension field.
 85  */
 86 typedef enum {
 87         SCTP_CID_DATA                   = 0,
 88         SCTP_CID_INIT                   = 1,
 89         SCTP_CID_INIT_ACK               = 2,
 90         SCTP_CID_SACK                   = 3,
 91         SCTP_CID_HEARTBEAT              = 4,
 92         SCTP_CID_HEARTBEAT_ACK          = 5,
 93         SCTP_CID_ABORT                  = 6,
 94         SCTP_CID_SHUTDOWN               = 7,
 95         SCTP_CID_SHUTDOWN_ACK           = 8,
 96         SCTP_CID_ERROR                  = 9,
 97         SCTP_CID_COOKIE_ECHO            = 10,
 98         SCTP_CID_COOKIE_ACK             = 11,
 99         SCTP_CID_ECN_ECNE               = 12,
100         SCTP_CID_ECN_CWR                = 13,
101         SCTP_CID_SHUTDOWN_COMPLETE      = 14,
102 
103         /* AUTH Extension Section 4.1 */
104         SCTP_CID_AUTH                   = 0x0F,
105 
106         /* PR-SCTP Sec 3.2 */
107         SCTP_CID_FWD_TSN                = 0xC0,
108 
109         /* Use hex, as defined in ADDIP sec. 3.1 */
110         SCTP_CID_ASCONF                 = 0xC1,
111         SCTP_CID_ASCONF_ACK             = 0x80,
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 } __packed 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 } sctp_param_t; /* enum */
204 
205 
206 /* RFC 2960 Section 3.2.1
207  *  The Parameter Types are encoded such that the highest-order two bits
208  *  specify the action that must be taken if the processing endpoint does
209  *  not recognize the Parameter Type.
210  *
211  */
212 typedef enum {
213         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
214         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
215         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
216         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
217 } sctp_param_action_t;
218 
219 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
220 
221 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
222 
223 typedef struct sctp_datahdr {
224         __be32 tsn;
225         __be16 stream;
226         __be16 ssn;
227         __be32 ppid;
228         __u8  payload[0];
229 } __packed sctp_datahdr_t;
230 
231 typedef struct sctp_data_chunk {
232         sctp_chunkhdr_t chunk_hdr;
233         sctp_datahdr_t  data_hdr;
234 } __packed sctp_data_chunk_t;
235 
236 /* DATA Chuck Specific Flags */
237 enum {
238         SCTP_DATA_MIDDLE_FRAG   = 0x00,
239         SCTP_DATA_LAST_FRAG     = 0x01,
240         SCTP_DATA_FIRST_FRAG    = 0x02,
241         SCTP_DATA_NOT_FRAG      = 0x03,
242         SCTP_DATA_UNORDERED     = 0x04,
243         SCTP_DATA_SACK_IMM      = 0x08,
244 };
245 enum { SCTP_DATA_FRAG_MASK = 0x03, };
246 
247 
248 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
249  *
250  *  This chunk is used to initiate a SCTP association between two
251  *  endpoints.
252  */
253 typedef struct sctp_inithdr {
254         __be32 init_tag;
255         __be32 a_rwnd;
256         __be16 num_outbound_streams;
257         __be16 num_inbound_streams;
258         __be32 initial_tsn;
259         __u8  params[0];
260 } __packed sctp_inithdr_t;
261 
262 typedef struct sctp_init_chunk {
263         sctp_chunkhdr_t chunk_hdr;
264         sctp_inithdr_t init_hdr;
265 } __packed sctp_init_chunk_t;
266 
267 
268 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
269 typedef struct sctp_ipv4addr_param {
270         sctp_paramhdr_t param_hdr;
271         struct in_addr  addr;
272 } __packed sctp_ipv4addr_param_t;
273 
274 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
275 typedef struct sctp_ipv6addr_param {
276         sctp_paramhdr_t param_hdr;
277         struct in6_addr addr;
278 } __packed sctp_ipv6addr_param_t;
279 
280 /* Section 3.3.2.1 Cookie Preservative (9) */
281 typedef struct sctp_cookie_preserve_param {
282         sctp_paramhdr_t param_hdr;
283         __be32          lifespan_increment;
284 } __packed sctp_cookie_preserve_param_t;
285 
286 /* Section 3.3.2.1 Host Name Address (11) */
287 typedef struct sctp_hostname_param {
288         sctp_paramhdr_t param_hdr;
289         uint8_t hostname[0];
290 } __packed sctp_hostname_param_t;
291 
292 /* Section 3.3.2.1 Supported Address Types (12) */
293 typedef struct sctp_supported_addrs_param {
294         sctp_paramhdr_t param_hdr;
295         __be16 types[0];
296 } __packed sctp_supported_addrs_param_t;
297 
298 /* Appendix A. ECN Capable (32768) */
299 typedef struct sctp_ecn_capable_param {
300         sctp_paramhdr_t param_hdr;
301 } __packed sctp_ecn_capable_param_t;
302 
303 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
304 typedef struct sctp_adaptation_ind_param {
305         struct sctp_paramhdr param_hdr;
306         __be32 adaptation_ind;
307 } __packed sctp_adaptation_ind_param_t;
308 
309 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
310 typedef struct sctp_supported_ext_param {
311         struct sctp_paramhdr param_hdr;
312         __u8 chunks[0];
313 } __packed sctp_supported_ext_param_t;
314 
315 /* AUTH Section 3.1 Random */
316 typedef struct sctp_random_param {
317         sctp_paramhdr_t param_hdr;
318         __u8 random_val[0];
319 } __packed sctp_random_param_t;
320 
321 /* AUTH Section 3.2 Chunk List */
322 typedef struct sctp_chunks_param {
323         sctp_paramhdr_t param_hdr;
324         __u8 chunks[0];
325 } __packed sctp_chunks_param_t;
326 
327 /* AUTH Section 3.3 HMAC Algorithm */
328 typedef struct sctp_hmac_algo_param {
329         sctp_paramhdr_t param_hdr;
330         __be16 hmac_ids[0];
331 } __packed sctp_hmac_algo_param_t;
332 
333 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
334  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
335  *   association.
336  */
337 typedef sctp_init_chunk_t sctp_initack_chunk_t;
338 
339 /* Section 3.3.3.1 State Cookie (7) */
340 typedef struct sctp_cookie_param {
341         sctp_paramhdr_t p;
342         __u8 body[0];
343 } __packed sctp_cookie_param_t;
344 
345 /* Section 3.3.3.1 Unrecognized Parameters (8) */
346 typedef struct sctp_unrecognized_param {
347         sctp_paramhdr_t param_hdr;
348         sctp_paramhdr_t unrecognized;
349 } __packed sctp_unrecognized_param_t;
350 
351 
352 
353 /*
354  * 3.3.4 Selective Acknowledgement (SACK) (3):
355  *
356  *  This chunk is sent to the peer endpoint to acknowledge received DATA
357  *  chunks and to inform the peer endpoint of gaps in the received
358  *  subsequences of DATA chunks as represented by their TSNs.
359  */
360 
361 typedef struct sctp_gap_ack_block {
362         __be16 start;
363         __be16 end;
364 } __packed sctp_gap_ack_block_t;
365 
366 typedef __be32 sctp_dup_tsn_t;
367 
368 typedef union {
369         sctp_gap_ack_block_t    gab;
370         sctp_dup_tsn_t          dup;
371 } sctp_sack_variable_t;
372 
373 typedef struct sctp_sackhdr {
374         __be32 cum_tsn_ack;
375         __be32 a_rwnd;
376         __be16 num_gap_ack_blocks;
377         __be16 num_dup_tsns;
378         sctp_sack_variable_t variable[0];
379 } __packed sctp_sackhdr_t;
380 
381 typedef struct sctp_sack_chunk {
382         sctp_chunkhdr_t chunk_hdr;
383         sctp_sackhdr_t sack_hdr;
384 } __packed sctp_sack_chunk_t;
385 
386 
387 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
388  *
389  *  An endpoint should send this chunk to its peer endpoint to probe the
390  *  reachability of a particular destination transport address defined in
391  *  the present association.
392  */
393 
394 typedef struct sctp_heartbeathdr {
395         sctp_paramhdr_t info;
396 } __packed sctp_heartbeathdr_t;
397 
398 typedef struct sctp_heartbeat_chunk {
399         sctp_chunkhdr_t chunk_hdr;
400         sctp_heartbeathdr_t hb_hdr;
401 } __packed sctp_heartbeat_chunk_t;
402 
403 
404 /* For the abort and shutdown ACK we must carry the init tag in the
405  * common header. Just the common header is all that is needed with a
406  * chunk descriptor.
407  */
408 typedef struct sctp_abort_chunk {
409         sctp_chunkhdr_t uh;
410 } __packed sctp_abort_chunk_t;
411 
412 
413 /* For the graceful shutdown we must carry the tag (in common header)
414  * and the highest consecutive acking value.
415  */
416 typedef struct sctp_shutdownhdr {
417         __be32 cum_tsn_ack;
418 } __packed sctp_shutdownhdr_t;
419 
420 struct sctp_shutdown_chunk_t {
421         sctp_chunkhdr_t    chunk_hdr;
422         sctp_shutdownhdr_t shutdown_hdr;
423 } __packed;
424 
425 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
426 
427 typedef struct sctp_errhdr {
428         __be16 cause;
429         __be16 length;
430         __u8  variable[0];
431 } __packed sctp_errhdr_t;
432 
433 typedef struct sctp_operr_chunk {
434         sctp_chunkhdr_t chunk_hdr;
435         sctp_errhdr_t   err_hdr;
436 } __packed sctp_operr_chunk_t;
437 
438 /* RFC 2960 3.3.10 - Operation Error
439  *
440  * Cause Code: 16 bits (unsigned integer)
441  *
442  *     Defines the type of error conditions being reported.
443  *    Cause Code
444  *     Value           Cause Code
445  *     ---------      ----------------
446  *      1              Invalid Stream Identifier
447  *      2              Missing Mandatory Parameter
448  *      3              Stale Cookie Error
449  *      4              Out of Resource
450  *      5              Unresolvable Address
451  *      6              Unrecognized Chunk Type
452  *      7              Invalid Mandatory Parameter
453  *      8              Unrecognized Parameters
454  *      9              No User Data
455  *     10              Cookie Received While Shutting Down
456  */
457 typedef enum {
458 
459         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
460         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
461         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
462         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
463         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
464         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
465         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
466         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
467         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
468         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
469         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
470 
471 
472         /* SCTP Implementation Guide:
473          *  11  Restart of an association with new addresses
474          *  12  User Initiated Abort
475          *  13  Protocol Violation
476          */
477 
478         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
479         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
480         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
481 
482         /* ADDIP Section 3.3  New Error Causes
483          *
484          * Four new Error Causes are added to the SCTP Operational Errors,
485          * primarily for use in the ASCONF-ACK chunk.
486          *
487          * Value          Cause Code
488          * ---------      ----------------
489          * 0x00A0          Request to Delete Last Remaining IP Address.
490          * 0x00A1          Operation Refused Due to Resource Shortage.
491          * 0x00A2          Request to Delete Source IP Address.
492          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
493          * 0x00A4          Request refused - no authorization.
494          */
495         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
496         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
497         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
498         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
499         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
500 
501         /* AUTH Section 4.  New Error Cause
502          *
503          * This section defines a new error cause that will be sent if an AUTH
504          * chunk is received with an unsupported HMAC identifier.
505          * illustrates the new error cause.
506          *
507          * Cause Code      Error Cause Name
508          * --------------------------------------------------------------
509          * 0x0105          Unsupported HMAC Identifier
510          */
511          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
512 } sctp_error_t;
513 
514 
515 
516 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
517  *   Explicit Congestion Notification Echo (ECNE) (12)
518  */
519 typedef struct sctp_ecnehdr {
520         __be32 lowest_tsn;
521 } sctp_ecnehdr_t;
522 
523 typedef struct sctp_ecne_chunk {
524         sctp_chunkhdr_t chunk_hdr;
525         sctp_ecnehdr_t ence_hdr;
526 } __packed sctp_ecne_chunk_t;
527 
528 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
529  *   Congestion Window Reduced (CWR) (13)
530  */
531 typedef struct sctp_cwrhdr {
532         __be32 lowest_tsn;
533 } sctp_cwrhdr_t;
534 
535 typedef struct sctp_cwr_chunk {
536         sctp_chunkhdr_t chunk_hdr;
537         sctp_cwrhdr_t cwr_hdr;
538 } __packed sctp_cwr_chunk_t;
539 
540 /* PR-SCTP
541  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
542  *
543  * Forward Cumulative TSN chunk has the following format:
544  *
545  *        0                   1                   2                   3
546  *        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
547  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
549  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550  *      |                      New Cumulative TSN                       |
551  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552  *      |         Stream-1              |       Stream Sequence-1       |
553  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554  *      \                                                               /
555  *      /                                                               \
556  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557  *      |         Stream-N              |       Stream Sequence-N       |
558  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559  *
560  *      Chunk Flags:
561  *
562  *        Set to all zeros on transmit and ignored on receipt.
563  *
564  *      New Cumulative TSN: 32 bit u_int
565  *
566  *       This indicates the new cumulative TSN to the data receiver. Upon
567  *       the reception of this value, the data receiver MUST consider
568  *       any missing TSNs earlier than or equal to this value as received
569  *       and stop reporting them as gaps in any subsequent SACKs.
570  *
571  *      Stream-N: 16 bit u_int
572  *
573  *       This field holds a stream number that was skipped by this
574  *       FWD-TSN.
575  *
576  *      Stream Sequence-N: 16 bit u_int
577  *       This field holds the sequence number associated with the stream
578  *       that was skipped. The stream sequence field holds the largest stream
579  *       sequence number in this stream being skipped.  The receiver of
580  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
581  *       to enable delivery of any stranded TSN's that remain on the stream
582  *       re-ordering queues. This field MUST NOT report TSN's corresponding
583  *       to DATA chunk that are marked as unordered. For ordered DATA
584  *       chunks this field MUST be filled in.
585  */
586 struct sctp_fwdtsn_skip {
587         __be16 stream;
588         __be16 ssn;
589 } __packed;
590 
591 struct sctp_fwdtsn_hdr {
592         __be32 new_cum_tsn;
593         struct sctp_fwdtsn_skip skip[0];
594 } __packed;
595 
596 struct sctp_fwdtsn_chunk {
597         struct sctp_chunkhdr chunk_hdr;
598         struct sctp_fwdtsn_hdr fwdtsn_hdr;
599 } __packed;
600 
601 
602 /* ADDIP
603  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
604  *
605  *      Serial Number: 32 bits (unsigned integer)
606  *      This value represents a Serial Number for the ASCONF Chunk. The
607  *      valid range of Serial Number is from 0 to 2^32-1.
608  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
609  *
610  *      Address Parameter: 8 or 20 bytes (depending on type)
611  *      The address is an address of the sender of the ASCONF chunk,
612  *      the address MUST be considered part of the association by the
613  *      peer endpoint. This field may be used by the receiver of the 
614  *      ASCONF to help in finding the association. This parameter MUST
615  *      be present in every ASCONF message i.e. it is a mandatory TLV
616  *      parameter.
617  *
618  *      ASCONF Parameter: TLV format
619  *      Each Address configuration change is represented by a TLV
620  *      parameter as defined in Section 3.2. One or more requests may
621  *      be present in an ASCONF Chunk.
622  *
623  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
624  * 
625  *      Serial Number: 32 bits (unsigned integer)
626  *      This value represents the Serial Number for the received ASCONF
627  *      Chunk that is acknowledged by this chunk. This value is copied
628  *      from the received ASCONF Chunk. 
629  *
630  *      ASCONF Parameter Response: TLV format
631  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
632  *      report status of ASCONF processing.
633  */
634 typedef struct sctp_addip_param {
635         sctp_paramhdr_t param_hdr;
636         __be32          crr_id;
637 } __packed sctp_addip_param_t;
638 
639 typedef struct sctp_addiphdr {
640         __be32  serial;
641         __u8    params[0];
642 } __packed sctp_addiphdr_t;
643 
644 typedef struct sctp_addip_chunk {
645         sctp_chunkhdr_t chunk_hdr;
646         sctp_addiphdr_t addip_hdr;
647 } __packed sctp_addip_chunk_t;
648 
649 /* AUTH
650  * Section 4.1  Authentication Chunk (AUTH)
651  *
652  *   This chunk is used to hold the result of the HMAC calculation.
653  *
654  *    0                   1                   2                   3
655  *    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
656  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
657  *   | Type = 0x0F   |   Flags=0     |             Length            |
658  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
659  *   |     Shared Key Identifier     |   HMAC Identifier             |
660  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
661  *   |                                                               |
662  *   \                             HMAC                              /
663  *   /                                                               \
664  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
665  *
666  *   Type: 1 byte (unsigned integer)
667  *      This value MUST be set to 0x0F for  all AUTH-chunks.
668  *
669  *   Flags: 1 byte (unsigned integer)
670  *      Set to zero on transmit and ignored on receipt.
671  *
672  *   Length: 2 bytes (unsigned integer)
673  *      This value holds the length of the HMAC in bytes plus 8.
674  *
675  *  Shared Key Identifier: 2 bytes (unsigned integer)
676  *      This value describes which endpoint pair shared key is used.
677  *
678  *   HMAC Identifier: 2 bytes (unsigned integer)
679  *      This value describes which message digest is being used.  Table 2
680  *      shows the currently defined values.
681  *
682  *    The following Table 2 shows the currently defined values for HMAC
683  *       identifiers.
684  *
685  *       +-----------------+--------------------------+
686  *       | HMAC Identifier | Message Digest Algorithm |
687  *       +-----------------+--------------------------+
688  *       | 0               | Reserved                 |
689  *       | 1               | SHA-1 defined in [8]     |
690  *       | 2               | Reserved                 |
691  *       | 3               | SHA-256 defined in [8]   |
692  *       +-----------------+--------------------------+
693  *
694  *
695  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
696  *      calculation.
697  */
698 typedef struct sctp_authhdr {
699         __be16 shkey_id;
700         __be16 hmac_id;
701         __u8   hmac[0];
702 } __packed sctp_authhdr_t;
703 
704 typedef struct sctp_auth_chunk {
705         sctp_chunkhdr_t chunk_hdr;
706         sctp_authhdr_t auth_hdr;
707 } __packed sctp_auth_chunk_t;
708 
709 #endif /* __LINUX_SCTP_H__ */
710 

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