~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 } __packed 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 } __packed 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_t; /* enum */
112 
113 
114 /* Section 3.2
115  *  Chunk Types are encoded such that the highest-order two bits specify
116  *  the action that must be taken if the processing endpoint does not
117  *  recognize the Chunk Type.
118  */
119 typedef enum {
120         SCTP_CID_ACTION_DISCARD     = 0x00,
121         SCTP_CID_ACTION_DISCARD_ERR = 0x40,
122         SCTP_CID_ACTION_SKIP        = 0x80,
123         SCTP_CID_ACTION_SKIP_ERR    = 0xc0,
124 } sctp_cid_action_t;
125 
126 enum { SCTP_CID_ACTION_MASK = 0xc0, };
127 
128 /* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
129  *
130  * 3.3.7 Abort Association (ABORT) (6):
131  *    The T bit is set to 0 if the sender had a TCB that it destroyed.
132  *    If the sender did not have a TCB it should set this bit to 1.
133  */
134 enum { SCTP_CHUNK_FLAG_T = 0x01 };
135 
136 /*
137  *  Set the T bit
138  *
139  *      0                   1                   2                   3
140  *      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
141  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
142  *     |   Type = 14   |Reserved     |T|      Length = 4               |
143  *     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
144  *
145  * Chunk Flags: 8 bits
146  *
147  *   Reserved:  7 bits
148  *     Set to 0 on transmit and ignored on receipt.
149  *
150  *   T bit:  1 bit
151  *     The T bit is set to 0 if the sender had a TCB that it destroyed. If
152  *     the sender did NOT have a TCB it should set this bit to 1.
153  *
154  * Note: Special rules apply to this chunk for verification, please
155  * see Section 8.5.1 for details.
156  */
157 
158 #define sctp_test_T_bit(c)    ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
159 
160 /* RFC 2960
161  * Section 3.2.1 Optional/Variable-length Parmaeter Format.
162  */
163 
164 typedef struct sctp_paramhdr {
165         __be16 type;
166         __be16 length;
167 } __packed sctp_paramhdr_t;
168 
169 typedef enum {
170 
171         /* RFC 2960 Section 3.3.5 */
172         SCTP_PARAM_HEARTBEAT_INFO               = cpu_to_be16(1),
173         /* RFC 2960 Section 3.3.2.1 */
174         SCTP_PARAM_IPV4_ADDRESS                 = cpu_to_be16(5),
175         SCTP_PARAM_IPV6_ADDRESS                 = cpu_to_be16(6),
176         SCTP_PARAM_STATE_COOKIE                 = cpu_to_be16(7),
177         SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = cpu_to_be16(8),
178         SCTP_PARAM_COOKIE_PRESERVATIVE          = cpu_to_be16(9),
179         SCTP_PARAM_HOST_NAME_ADDRESS            = cpu_to_be16(11),
180         SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = cpu_to_be16(12),
181         SCTP_PARAM_ECN_CAPABLE                  = cpu_to_be16(0x8000),
182 
183         /* AUTH Extension Section 3 */
184         SCTP_PARAM_RANDOM                       = cpu_to_be16(0x8002),
185         SCTP_PARAM_CHUNKS                       = cpu_to_be16(0x8003),
186         SCTP_PARAM_HMAC_ALGO                    = cpu_to_be16(0x8004),
187 
188         /* Add-IP: Supported Extensions, Section 4.2 */
189         SCTP_PARAM_SUPPORTED_EXT        = cpu_to_be16(0x8008),
190 
191         /* PR-SCTP Sec 3.1 */
192         SCTP_PARAM_FWD_TSN_SUPPORT      = cpu_to_be16(0xc000),
193 
194         /* Add-IP Extension. Section 3.2 */
195         SCTP_PARAM_ADD_IP               = cpu_to_be16(0xc001),
196         SCTP_PARAM_DEL_IP               = cpu_to_be16(0xc002),
197         SCTP_PARAM_ERR_CAUSE            = cpu_to_be16(0xc003),
198         SCTP_PARAM_SET_PRIMARY          = cpu_to_be16(0xc004),
199         SCTP_PARAM_SUCCESS_REPORT       = cpu_to_be16(0xc005),
200         SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
201 
202 } sctp_param_t; /* enum */
203 
204 
205 /* RFC 2960 Section 3.2.1
206  *  The Parameter Types are encoded such that the highest-order two bits
207  *  specify the action that must be taken if the processing endpoint does
208  *  not recognize the Parameter Type.
209  *
210  */
211 typedef enum {
212         SCTP_PARAM_ACTION_DISCARD     = cpu_to_be16(0x0000),
213         SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
214         SCTP_PARAM_ACTION_SKIP        = cpu_to_be16(0x8000),
215         SCTP_PARAM_ACTION_SKIP_ERR    = cpu_to_be16(0xc000),
216 } sctp_param_action_t;
217 
218 enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
219 
220 /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
221 
222 typedef struct sctp_datahdr {
223         __be32 tsn;
224         __be16 stream;
225         __be16 ssn;
226         __be32 ppid;
227         __u8  payload[0];
228 } __packed sctp_datahdr_t;
229 
230 typedef struct sctp_data_chunk {
231         sctp_chunkhdr_t chunk_hdr;
232         sctp_datahdr_t  data_hdr;
233 } __packed sctp_data_chunk_t;
234 
235 /* DATA Chuck Specific Flags */
236 enum {
237         SCTP_DATA_MIDDLE_FRAG   = 0x00,
238         SCTP_DATA_LAST_FRAG     = 0x01,
239         SCTP_DATA_FIRST_FRAG    = 0x02,
240         SCTP_DATA_NOT_FRAG      = 0x03,
241         SCTP_DATA_UNORDERED     = 0x04,
242         SCTP_DATA_SACK_IMM      = 0x08,
243 };
244 enum { SCTP_DATA_FRAG_MASK = 0x03, };
245 
246 
247 /* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
248  *
249  *  This chunk is used to initiate a SCTP association between two
250  *  endpoints.
251  */
252 typedef struct sctp_inithdr {
253         __be32 init_tag;
254         __be32 a_rwnd;
255         __be16 num_outbound_streams;
256         __be16 num_inbound_streams;
257         __be32 initial_tsn;
258         __u8  params[0];
259 } __packed sctp_inithdr_t;
260 
261 typedef struct sctp_init_chunk {
262         sctp_chunkhdr_t chunk_hdr;
263         sctp_inithdr_t init_hdr;
264 } __packed sctp_init_chunk_t;
265 
266 
267 /* Section 3.3.2.1. IPv4 Address Parameter (5) */
268 typedef struct sctp_ipv4addr_param {
269         sctp_paramhdr_t param_hdr;
270         struct in_addr  addr;
271 } __packed sctp_ipv4addr_param_t;
272 
273 /* Section 3.3.2.1. IPv6 Address Parameter (6) */
274 typedef struct sctp_ipv6addr_param {
275         sctp_paramhdr_t param_hdr;
276         struct in6_addr addr;
277 } __packed sctp_ipv6addr_param_t;
278 
279 /* Section 3.3.2.1 Cookie Preservative (9) */
280 typedef struct sctp_cookie_preserve_param {
281         sctp_paramhdr_t param_hdr;
282         __be32          lifespan_increment;
283 } __packed sctp_cookie_preserve_param_t;
284 
285 /* Section 3.3.2.1 Host Name Address (11) */
286 typedef struct sctp_hostname_param {
287         sctp_paramhdr_t param_hdr;
288         uint8_t hostname[0];
289 } __packed sctp_hostname_param_t;
290 
291 /* Section 3.3.2.1 Supported Address Types (12) */
292 typedef struct sctp_supported_addrs_param {
293         sctp_paramhdr_t param_hdr;
294         __be16 types[0];
295 } __packed sctp_supported_addrs_param_t;
296 
297 /* Appendix A. ECN Capable (32768) */
298 typedef struct sctp_ecn_capable_param {
299         sctp_paramhdr_t param_hdr;
300 } __packed sctp_ecn_capable_param_t;
301 
302 /* ADDIP Section 3.2.6 Adaptation Layer Indication */
303 typedef struct sctp_adaptation_ind_param {
304         struct sctp_paramhdr param_hdr;
305         __be32 adaptation_ind;
306 } __packed sctp_adaptation_ind_param_t;
307 
308 /* ADDIP Section 4.2.7 Supported Extensions Parameter */
309 typedef struct sctp_supported_ext_param {
310         struct sctp_paramhdr param_hdr;
311         __u8 chunks[0];
312 } __packed sctp_supported_ext_param_t;
313 
314 /* AUTH Section 3.1 Random */
315 typedef struct sctp_random_param {
316         sctp_paramhdr_t param_hdr;
317         __u8 random_val[0];
318 } __packed sctp_random_param_t;
319 
320 /* AUTH Section 3.2 Chunk List */
321 typedef struct sctp_chunks_param {
322         sctp_paramhdr_t param_hdr;
323         __u8 chunks[0];
324 } __packed sctp_chunks_param_t;
325 
326 /* AUTH Section 3.3 HMAC Algorithm */
327 typedef struct sctp_hmac_algo_param {
328         sctp_paramhdr_t param_hdr;
329         __be16 hmac_ids[0];
330 } __packed sctp_hmac_algo_param_t;
331 
332 /* RFC 2960.  Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
333  *   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
334  *   association.
335  */
336 typedef sctp_init_chunk_t sctp_initack_chunk_t;
337 
338 /* Section 3.3.3.1 State Cookie (7) */
339 typedef struct sctp_cookie_param {
340         sctp_paramhdr_t p;
341         __u8 body[0];
342 } __packed sctp_cookie_param_t;
343 
344 /* Section 3.3.3.1 Unrecognized Parameters (8) */
345 typedef struct sctp_unrecognized_param {
346         sctp_paramhdr_t param_hdr;
347         sctp_paramhdr_t unrecognized;
348 } __packed sctp_unrecognized_param_t;
349 
350 
351 
352 /*
353  * 3.3.4 Selective Acknowledgement (SACK) (3):
354  *
355  *  This chunk is sent to the peer endpoint to acknowledge received DATA
356  *  chunks and to inform the peer endpoint of gaps in the received
357  *  subsequences of DATA chunks as represented by their TSNs.
358  */
359 
360 typedef struct sctp_gap_ack_block {
361         __be16 start;
362         __be16 end;
363 } __packed sctp_gap_ack_block_t;
364 
365 typedef __be32 sctp_dup_tsn_t;
366 
367 typedef union {
368         sctp_gap_ack_block_t    gab;
369         sctp_dup_tsn_t          dup;
370 } sctp_sack_variable_t;
371 
372 typedef struct sctp_sackhdr {
373         __be32 cum_tsn_ack;
374         __be32 a_rwnd;
375         __be16 num_gap_ack_blocks;
376         __be16 num_dup_tsns;
377         sctp_sack_variable_t variable[0];
378 } __packed sctp_sackhdr_t;
379 
380 typedef struct sctp_sack_chunk {
381         sctp_chunkhdr_t chunk_hdr;
382         sctp_sackhdr_t sack_hdr;
383 } __packed sctp_sack_chunk_t;
384 
385 
386 /* RFC 2960.  Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
387  *
388  *  An endpoint should send this chunk to its peer endpoint to probe the
389  *  reachability of a particular destination transport address defined in
390  *  the present association.
391  */
392 
393 typedef struct sctp_heartbeathdr {
394         sctp_paramhdr_t info;
395 } __packed sctp_heartbeathdr_t;
396 
397 typedef struct sctp_heartbeat_chunk {
398         sctp_chunkhdr_t chunk_hdr;
399         sctp_heartbeathdr_t hb_hdr;
400 } __packed sctp_heartbeat_chunk_t;
401 
402 
403 /* For the abort and shutdown ACK we must carry the init tag in the
404  * common header. Just the common header is all that is needed with a
405  * chunk descriptor.
406  */
407 typedef struct sctp_abort_chunk {
408         sctp_chunkhdr_t uh;
409 } __packed sctp_abort_chunk_t;
410 
411 
412 /* For the graceful shutdown we must carry the tag (in common header)
413  * and the highest consecutive acking value.
414  */
415 typedef struct sctp_shutdownhdr {
416         __be32 cum_tsn_ack;
417 } __packed sctp_shutdownhdr_t;
418 
419 struct sctp_shutdown_chunk_t {
420         sctp_chunkhdr_t    chunk_hdr;
421         sctp_shutdownhdr_t shutdown_hdr;
422 } __packed;
423 
424 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
425 
426 typedef struct sctp_errhdr {
427         __be16 cause;
428         __be16 length;
429         __u8  variable[0];
430 } __packed sctp_errhdr_t;
431 
432 typedef struct sctp_operr_chunk {
433         sctp_chunkhdr_t chunk_hdr;
434         sctp_errhdr_t   err_hdr;
435 } __packed sctp_operr_chunk_t;
436 
437 /* RFC 2960 3.3.10 - Operation Error
438  *
439  * Cause Code: 16 bits (unsigned integer)
440  *
441  *     Defines the type of error conditions being reported.
442  *    Cause Code
443  *     Value           Cause Code
444  *     ---------      ----------------
445  *      1              Invalid Stream Identifier
446  *      2              Missing Mandatory Parameter
447  *      3              Stale Cookie Error
448  *      4              Out of Resource
449  *      5              Unresolvable Address
450  *      6              Unrecognized Chunk Type
451  *      7              Invalid Mandatory Parameter
452  *      8              Unrecognized Parameters
453  *      9              No User Data
454  *     10              Cookie Received While Shutting Down
455  */
456 typedef enum {
457 
458         SCTP_ERROR_NO_ERROR        = cpu_to_be16(0x00),
459         SCTP_ERROR_INV_STRM        = cpu_to_be16(0x01),
460         SCTP_ERROR_MISS_PARAM      = cpu_to_be16(0x02),
461         SCTP_ERROR_STALE_COOKIE    = cpu_to_be16(0x03),
462         SCTP_ERROR_NO_RESOURCE     = cpu_to_be16(0x04),
463         SCTP_ERROR_DNS_FAILED      = cpu_to_be16(0x05),
464         SCTP_ERROR_UNKNOWN_CHUNK   = cpu_to_be16(0x06),
465         SCTP_ERROR_INV_PARAM       = cpu_to_be16(0x07),
466         SCTP_ERROR_UNKNOWN_PARAM   = cpu_to_be16(0x08),
467         SCTP_ERROR_NO_DATA         = cpu_to_be16(0x09),
468         SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
469 
470 
471         /* SCTP Implementation Guide:
472          *  11  Restart of an association with new addresses
473          *  12  User Initiated Abort
474          *  13  Protocol Violation
475          */
476 
477         SCTP_ERROR_RESTART         = cpu_to_be16(0x0b),
478         SCTP_ERROR_USER_ABORT      = cpu_to_be16(0x0c),
479         SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
480 
481         /* ADDIP Section 3.3  New Error Causes
482          *
483          * Four new Error Causes are added to the SCTP Operational Errors,
484          * primarily for use in the ASCONF-ACK chunk.
485          *
486          * Value          Cause Code
487          * ---------      ----------------
488          * 0x00A0          Request to Delete Last Remaining IP Address.
489          * 0x00A1          Operation Refused Due to Resource Shortage.
490          * 0x00A2          Request to Delete Source IP Address.
491          * 0x00A3          Association Aborted due to illegal ASCONF-ACK
492          * 0x00A4          Request refused - no authorization.
493          */
494         SCTP_ERROR_DEL_LAST_IP  = cpu_to_be16(0x00A0),
495         SCTP_ERROR_RSRC_LOW     = cpu_to_be16(0x00A1),
496         SCTP_ERROR_DEL_SRC_IP   = cpu_to_be16(0x00A2),
497         SCTP_ERROR_ASCONF_ACK   = cpu_to_be16(0x00A3),
498         SCTP_ERROR_REQ_REFUSED  = cpu_to_be16(0x00A4),
499 
500         /* AUTH Section 4.  New Error Cause
501          *
502          * This section defines a new error cause that will be sent if an AUTH
503          * chunk is received with an unsupported HMAC identifier.
504          * illustrates the new error cause.
505          *
506          * Cause Code      Error Cause Name
507          * --------------------------------------------------------------
508          * 0x0105          Unsupported HMAC Identifier
509          */
510          SCTP_ERROR_UNSUP_HMAC  = cpu_to_be16(0x0105)
511 } sctp_error_t;
512 
513 
514 
515 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
516  *   Explicit Congestion Notification Echo (ECNE) (12)
517  */
518 typedef struct sctp_ecnehdr {
519         __be32 lowest_tsn;
520 } sctp_ecnehdr_t;
521 
522 typedef struct sctp_ecne_chunk {
523         sctp_chunkhdr_t chunk_hdr;
524         sctp_ecnehdr_t ence_hdr;
525 } __packed sctp_ecne_chunk_t;
526 
527 /* RFC 2960.  Appendix A.  Explicit Congestion Notification.
528  *   Congestion Window Reduced (CWR) (13)
529  */
530 typedef struct sctp_cwrhdr {
531         __be32 lowest_tsn;
532 } sctp_cwrhdr_t;
533 
534 typedef struct sctp_cwr_chunk {
535         sctp_chunkhdr_t chunk_hdr;
536         sctp_cwrhdr_t cwr_hdr;
537 } __packed sctp_cwr_chunk_t;
538 
539 /* PR-SCTP
540  * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
541  *
542  * Forward Cumulative TSN chunk has the following format:
543  *
544  *        0                   1                   2                   3
545  *        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
546  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
547  *      |   Type = 192  |  Flags = 0x00 |        Length = Variable      |
548  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549  *      |                      New Cumulative TSN                       |
550  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551  *      |         Stream-1              |       Stream Sequence-1       |
552  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553  *      \                                                               /
554  *      /                                                               \
555  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556  *      |         Stream-N              |       Stream Sequence-N       |
557  *      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558  *
559  *      Chunk Flags:
560  *
561  *        Set to all zeros on transmit and ignored on receipt.
562  *
563  *      New Cumulative TSN: 32 bit u_int
564  *
565  *       This indicates the new cumulative TSN to the data receiver. Upon
566  *       the reception of this value, the data receiver MUST consider
567  *       any missing TSNs earlier than or equal to this value as received
568  *       and stop reporting them as gaps in any subsequent SACKs.
569  *
570  *      Stream-N: 16 bit u_int
571  *
572  *       This field holds a stream number that was skipped by this
573  *       FWD-TSN.
574  *
575  *      Stream Sequence-N: 16 bit u_int
576  *       This field holds the sequence number associated with the stream
577  *       that was skipped. The stream sequence field holds the largest stream
578  *       sequence number in this stream being skipped.  The receiver of
579  *       the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
580  *       to enable delivery of any stranded TSN's that remain on the stream
581  *       re-ordering queues. This field MUST NOT report TSN's corresponding
582  *       to DATA chunk that are marked as unordered. For ordered DATA
583  *       chunks this field MUST be filled in.
584  */
585 struct sctp_fwdtsn_skip {
586         __be16 stream;
587         __be16 ssn;
588 } __packed;
589 
590 struct sctp_fwdtsn_hdr {
591         __be32 new_cum_tsn;
592         struct sctp_fwdtsn_skip skip[0];
593 } __packed;
594 
595 struct sctp_fwdtsn_chunk {
596         struct sctp_chunkhdr chunk_hdr;
597         struct sctp_fwdtsn_hdr fwdtsn_hdr;
598 } __packed;
599 
600 
601 /* ADDIP
602  * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
603  *
604  *      Serial Number: 32 bits (unsigned integer)
605  *      This value represents a Serial Number for the ASCONF Chunk. The
606  *      valid range of Serial Number is from 0 to 2^32-1.
607  *      Serial Numbers wrap back to 0 after reaching 2^32 -1.
608  *
609  *      Address Parameter: 8 or 20 bytes (depending on type)
610  *      The address is an address of the sender of the ASCONF chunk,
611  *      the address MUST be considered part of the association by the
612  *      peer endpoint. This field may be used by the receiver of the 
613  *      ASCONF to help in finding the association. This parameter MUST
614  *      be present in every ASCONF message i.e. it is a mandatory TLV
615  *      parameter.
616  *
617  *      ASCONF Parameter: TLV format
618  *      Each Address configuration change is represented by a TLV
619  *      parameter as defined in Section 3.2. One or more requests may
620  *      be present in an ASCONF Chunk.
621  *
622  * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
623  * 
624  *      Serial Number: 32 bits (unsigned integer)
625  *      This value represents the Serial Number for the received ASCONF
626  *      Chunk that is acknowledged by this chunk. This value is copied
627  *      from the received ASCONF Chunk. 
628  *
629  *      ASCONF Parameter Response: TLV format
630  *      The ASCONF Parameter Response is used in the ASCONF-ACK to
631  *      report status of ASCONF processing.
632  */
633 typedef struct sctp_addip_param {
634         sctp_paramhdr_t param_hdr;
635         __be32          crr_id;
636 } __packed sctp_addip_param_t;
637 
638 typedef struct sctp_addiphdr {
639         __be32  serial;
640         __u8    params[0];
641 } __packed sctp_addiphdr_t;
642 
643 typedef struct sctp_addip_chunk {
644         sctp_chunkhdr_t chunk_hdr;
645         sctp_addiphdr_t addip_hdr;
646 } __packed sctp_addip_chunk_t;
647 
648 /* AUTH
649  * Section 4.1  Authentication Chunk (AUTH)
650  *
651  *   This chunk is used to hold the result of the HMAC calculation.
652  *
653  *    0                   1                   2                   3
654  *    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
655  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
656  *   | Type = 0x0F   |   Flags=0     |             Length            |
657  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
658  *   |     Shared Key Identifier     |   HMAC Identifier             |
659  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
660  *   |                                                               |
661  *   \                             HMAC                              /
662  *   /                                                               \
663  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
664  *
665  *   Type: 1 byte (unsigned integer)
666  *      This value MUST be set to 0x0F for  all AUTH-chunks.
667  *
668  *   Flags: 1 byte (unsigned integer)
669  *      Set to zero on transmit and ignored on receipt.
670  *
671  *   Length: 2 bytes (unsigned integer)
672  *      This value holds the length of the HMAC in bytes plus 8.
673  *
674  *  Shared Key Identifier: 2 bytes (unsigned integer)
675  *      This value describes which endpoint pair shared key is used.
676  *
677  *   HMAC Identifier: 2 bytes (unsigned integer)
678  *      This value describes which message digest is being used.  Table 2
679  *      shows the currently defined values.
680  *
681  *    The following Table 2 shows the currently defined values for HMAC
682  *       identifiers.
683  *
684  *       +-----------------+--------------------------+
685  *       | HMAC Identifier | Message Digest Algorithm |
686  *       +-----------------+--------------------------+
687  *       | 0               | Reserved                 |
688  *       | 1               | SHA-1 defined in [8]     |
689  *       | 2               | Reserved                 |
690  *       | 3               | SHA-256 defined in [8]   |
691  *       +-----------------+--------------------------+
692  *
693  *
694  *   HMAC: n bytes (unsigned integer) This hold the result of the HMAC
695  *      calculation.
696  */
697 typedef struct sctp_authhdr {
698         __be16 shkey_id;
699         __be16 hmac_id;
700         __u8   hmac[0];
701 } __packed sctp_authhdr_t;
702 
703 typedef struct sctp_auth_chunk {
704         sctp_chunkhdr_t chunk_hdr;
705         sctp_authhdr_t auth_hdr;
706 } __packed sctp_auth_chunk_t;
707 
708 #endif /* __LINUX_SCTP_H__ */
709 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp