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netwerk/sctp/src/netinet/sctp_header.h

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1 /*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * a) Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 *
12 * b) Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the distribution.
15 *
16 * c) Neither the name of Cisco Systems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #ifdef __FreeBSD__
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_header.h 240198 2012-09-07 13:36:42Z tuexen $");
36 #endif
37
38 #ifndef _NETINET_SCTP_HEADER_H_
39 #define _NETINET_SCTP_HEADER_H_
40
41 #if defined(__Windows__) && !defined(__Userspace_os_Windows)
42 #include <packon.h>
43 #endif
44 #if !defined(__Userspace_os_Windows)
45 #include <sys/time.h>
46 #endif
47 #include <netinet/sctp.h>
48 #include <netinet/sctp_constants.h>
49
50 #if !defined(__Userspace_os_Windows)
51 #define SCTP_PACKED __attribute__((packed))
52 #else
53 #pragma pack (push, 1)
54 #define SCTP_PACKED
55 #endif
56
57 /*
58 * Parameter structures
59 */
60 struct sctp_ipv4addr_param {
61 struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */
62 uint32_t addr; /* IPV4 address */
63 } SCTP_PACKED;
64
65 #define SCTP_V6_ADDR_BYTES 16
66
67
68 struct sctp_ipv6addr_param {
69 struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */
70 uint8_t addr[SCTP_V6_ADDR_BYTES]; /* IPV6 address */
71 } SCTP_PACKED;
72
73 /* Cookie Preservative */
74 struct sctp_cookie_perserve_param {
75 struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */
76 uint32_t time; /* time in ms to extend cookie */
77 } SCTP_PACKED;
78
79 #define SCTP_ARRAY_MIN_LEN 1
80 /* Host Name Address */
81 struct sctp_host_name_param {
82 struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */
83 char name[SCTP_ARRAY_MIN_LEN]; /* host name */
84 } SCTP_PACKED;
85
86 /*
87 * This is the maximum padded size of a s-a-p
88 * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12
89 */
90 #define SCTP_MAX_ADDR_PARAMS_SIZE 12
91 /* supported address type */
92 struct sctp_supported_addr_param {
93 struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */
94 uint16_t addr_type[2]; /* array of supported address types */
95 } SCTP_PACKED;
96
97 /* ECN parameter */
98 struct sctp_ecn_supported_param {
99 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */
100 } SCTP_PACKED;
101
102
103 /* heartbeat info parameter */
104 struct sctp_heartbeat_info_param {
105 struct sctp_paramhdr ph;
106 uint32_t time_value_1;
107 uint32_t time_value_2;
108 uint32_t random_value1;
109 uint32_t random_value2;
110 uint8_t addr_family;
111 uint8_t addr_len;
112 /* make sure that this structure is 4 byte aligned */
113 uint8_t padding[2];
114 char address[SCTP_ADDRMAX];
115 } SCTP_PACKED;
116
117
118 /* draft-ietf-tsvwg-prsctp */
119 /* PR-SCTP supported parameter */
120 struct sctp_prsctp_supported_param {
121 struct sctp_paramhdr ph;
122 } SCTP_PACKED;
123
124
125 /* draft-ietf-tsvwg-addip-sctp */
126 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */
127 struct sctp_paramhdr ph;/* a SCTP parameter header */
128 uint32_t correlation_id;/* correlation id for this param */
129 } SCTP_PACKED;
130
131 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
132 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
133 struct sctp_ipv6addr_param addrp; /* max storage size */
134 } SCTP_PACKED;
135
136
137 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */
138 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
139 uint32_t local_vtag;
140 uint32_t remote_vtag;
141 } SCTP_PACKED;
142
143
144 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */
145 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
146 struct sctp_ipv4addr_param addrp; /* max storage size */
147 } SCTP_PACKED;
148
149 #define SCTP_MAX_SUPPORTED_EXT 256
150
151 struct sctp_supported_chunk_types_param {
152 struct sctp_paramhdr ph;/* type = 0x8008 len = x */
153 uint8_t chunk_types[];
154 } SCTP_PACKED;
155
156
157 /*
158 * Structures for DATA chunks
159 */
160 struct sctp_data {
161 uint32_t tsn;
162 uint16_t stream_id;
163 uint16_t stream_sequence;
164 uint32_t protocol_id;
165 /* user data follows */
166 } SCTP_PACKED;
167
168 struct sctp_data_chunk {
169 struct sctp_chunkhdr ch;
170 struct sctp_data dp;
171 } SCTP_PACKED;
172
173 /*
174 * Structures for the control chunks
175 */
176
177 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
178 struct sctp_init {
179 uint32_t initiate_tag; /* initiate tag */
180 uint32_t a_rwnd; /* a_rwnd */
181 uint16_t num_outbound_streams; /* OS */
182 uint16_t num_inbound_streams; /* MIS */
183 uint32_t initial_tsn; /* I-TSN */
184 /* optional param's follow */
185 } SCTP_PACKED;
186 #define SCTP_IDENTIFICATION_SIZE 16
187 #define SCTP_ADDRESS_SIZE 4
188 #if defined(__Userspace__)
189 #define SCTP_RESERVE_SPACE 5
190 #else
191 #define SCTP_RESERVE_SPACE 6
192 #endif
193 /* state cookie header */
194 struct sctp_state_cookie { /* this is our definition... */
195 uint8_t identification[SCTP_IDENTIFICATION_SIZE];/* id of who we are */
196 struct timeval time_entered; /* the time I built cookie */
197 uint32_t cookie_life; /* life I will award this cookie */
198 uint32_t tie_tag_my_vtag; /* my tag in old association */
199
200 uint32_t tie_tag_peer_vtag; /* peers tag in old association */
201 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */
202
203 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */
204 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */
205 uint32_t addr_type; /* address type */
206 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */
207 uint32_t laddr_type; /* my local from address type */
208 uint32_t scope_id; /* v6 scope id for link-locals */
209
210 uint16_t peerport; /* port address of the peer in the INIT */
211 uint16_t myport; /* my port address used in the INIT */
212 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
213 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
214 #if defined(__Userspace__)
215 uint8_t conn_addr_legal;
216 #endif
217 uint8_t local_scope; /* IPv6 local scope flag */
218 uint8_t site_scope; /* IPv6 site scope flag */
219
220 uint8_t ipv4_scope; /* IPv4 private addr scope */
221 uint8_t loopback_scope; /* loopback scope information */
222 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */
223 /*
224 * at the end is tacked on the INIT chunk and the INIT-ACK chunk
225 * (minus the cookie).
226 */
227 } SCTP_PACKED;
228
229
230 /* Used for NAT state error cause */
231 struct sctp_missing_nat_state {
232 uint16_t cause;
233 uint16_t length;
234 uint8_t data[];
235 } SCTP_PACKED;
236
237
238 struct sctp_inv_mandatory_param {
239 uint16_t cause;
240 uint16_t length;
241 uint32_t num_param;
242 uint16_t param;
243 /*
244 * We include this to 0 it since only a missing cookie will cause
245 * this error.
246 */
247 uint16_t resv;
248 } SCTP_PACKED;
249
250 struct sctp_unresolv_addr {
251 uint16_t cause;
252 uint16_t length;
253 uint16_t addr_type;
254 uint16_t reserved; /* Only one invalid addr type */
255 } SCTP_PACKED;
256
257 /* state cookie parameter */
258 struct sctp_state_cookie_param {
259 struct sctp_paramhdr ph;
260 struct sctp_state_cookie cookie;
261 } SCTP_PACKED;
262
263 struct sctp_init_chunk {
264 struct sctp_chunkhdr ch;
265 struct sctp_init init;
266 } SCTP_PACKED;
267
268 struct sctp_init_msg {
269 struct sctphdr sh;
270 struct sctp_init_chunk msg;
271 } SCTP_PACKED;
272
273 /* ... used for both INIT and INIT ACK */
274 #define sctp_init_ack sctp_init
275 #define sctp_init_ack_chunk sctp_init_chunk
276 #define sctp_init_ack_msg sctp_init_msg
277
278
279 /* Selective Ack (SACK) */
280 struct sctp_gap_ack_block {
281 uint16_t start; /* Gap Ack block start */
282 uint16_t end; /* Gap Ack block end */
283 } SCTP_PACKED;
284
285 struct sctp_sack {
286 uint32_t cum_tsn_ack; /* cumulative TSN Ack */
287 uint32_t a_rwnd; /* updated a_rwnd of sender */
288 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */
289 uint16_t num_dup_tsns; /* number of duplicate TSNs */
290 /* struct sctp_gap_ack_block's follow */
291 /* uint32_t duplicate_tsn's follow */
292 } SCTP_PACKED;
293
294 struct sctp_sack_chunk {
295 struct sctp_chunkhdr ch;
296 struct sctp_sack sack;
297 } SCTP_PACKED;
298
299 struct sctp_nr_sack {
300 uint32_t cum_tsn_ack; /* cumulative TSN Ack */
301 uint32_t a_rwnd; /* updated a_rwnd of sender */
302 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */
303 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */
304 uint16_t num_dup_tsns; /* number of duplicate TSNs */
305 uint16_t reserved; /* not currently used*/
306 /* struct sctp_gap_ack_block's follow */
307 /* uint32_t duplicate_tsn's follow */
308 } SCTP_PACKED;
309
310 struct sctp_nr_sack_chunk {
311 struct sctp_chunkhdr ch;
312 struct sctp_nr_sack nr_sack;
313 } SCTP_PACKED;
314
315
316 /* Heartbeat Request (HEARTBEAT) */
317 struct sctp_heartbeat {
318 struct sctp_heartbeat_info_param hb_info;
319 } SCTP_PACKED;
320
321 struct sctp_heartbeat_chunk {
322 struct sctp_chunkhdr ch;
323 struct sctp_heartbeat heartbeat;
324 } SCTP_PACKED;
325
326 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
327 #define sctp_heartbeat_ack sctp_heartbeat
328 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk
329
330
331 /* Abort Asssociation (ABORT) */
332 struct sctp_abort_chunk {
333 struct sctp_chunkhdr ch;
334 /* optional error cause may follow */
335 } SCTP_PACKED;
336
337 struct sctp_abort_msg {
338 struct sctphdr sh;
339 struct sctp_abort_chunk msg;
340 } SCTP_PACKED;
341
342
343 /* Shutdown Association (SHUTDOWN) */
344 struct sctp_shutdown_chunk {
345 struct sctp_chunkhdr ch;
346 uint32_t cumulative_tsn_ack;
347 } SCTP_PACKED;
348
349
350 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
351 struct sctp_shutdown_ack_chunk {
352 struct sctp_chunkhdr ch;
353 } SCTP_PACKED;
354
355
356 /* Operation Error (ERROR) */
357 struct sctp_error_chunk {
358 struct sctp_chunkhdr ch;
359 /* optional error causes follow */
360 } SCTP_PACKED;
361
362
363 /* Cookie Echo (COOKIE ECHO) */
364 struct sctp_cookie_echo_chunk {
365 struct sctp_chunkhdr ch;
366 struct sctp_state_cookie cookie;
367 } SCTP_PACKED;
368
369 /* Cookie Acknowledgment (COOKIE ACK) */
370 struct sctp_cookie_ack_chunk {
371 struct sctp_chunkhdr ch;
372 } SCTP_PACKED;
373
374 /* Explicit Congestion Notification Echo (ECNE) */
375 struct old_sctp_ecne_chunk {
376 struct sctp_chunkhdr ch;
377 uint32_t tsn;
378 } SCTP_PACKED;
379
380 struct sctp_ecne_chunk {
381 struct sctp_chunkhdr ch;
382 uint32_t tsn;
383 uint32_t num_pkts_since_cwr;
384 } SCTP_PACKED;
385
386 /* Congestion Window Reduced (CWR) */
387 struct sctp_cwr_chunk {
388 struct sctp_chunkhdr ch;
389 uint32_t tsn;
390 } SCTP_PACKED;
391
392 /* Shutdown Complete (SHUTDOWN COMPLETE) */
393 struct sctp_shutdown_complete_chunk {
394 struct sctp_chunkhdr ch;
395 } SCTP_PACKED;
396
397 /* Oper error holding a stale cookie */
398 struct sctp_stale_cookie_msg {
399 struct sctp_paramhdr ph;/* really an error cause */
400 uint32_t time_usec;
401 } SCTP_PACKED;
402
403 struct sctp_adaptation_layer_indication {
404 struct sctp_paramhdr ph;
405 uint32_t indication;
406 } SCTP_PACKED;
407
408 struct sctp_cookie_while_shutting_down {
409 struct sctphdr sh;
410 struct sctp_chunkhdr ch;
411 struct sctp_paramhdr ph;/* really an error cause */
412 } SCTP_PACKED;
413
414 struct sctp_shutdown_complete_msg {
415 struct sctphdr sh;
416 struct sctp_shutdown_complete_chunk shut_cmp;
417 } SCTP_PACKED;
418
419 /*
420 * draft-ietf-tsvwg-addip-sctp
421 */
422 /* Address/Stream Configuration Change (ASCONF) */
423 struct sctp_asconf_chunk {
424 struct sctp_chunkhdr ch;
425 uint32_t serial_number;
426 /* lookup address parameter (mandatory) */
427 /* asconf parameters follow */
428 } SCTP_PACKED;
429
430 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
431 struct sctp_asconf_ack_chunk {
432 struct sctp_chunkhdr ch;
433 uint32_t serial_number;
434 /* asconf parameters follow */
435 } SCTP_PACKED;
436
437 /* draft-ietf-tsvwg-prsctp */
438 /* Forward Cumulative TSN (FORWARD TSN) */
439 struct sctp_forward_tsn_chunk {
440 struct sctp_chunkhdr ch;
441 uint32_t new_cumulative_tsn;
442 /* stream/sequence pairs (sctp_strseq) follow */
443 } SCTP_PACKED;
444
445 struct sctp_strseq {
446 uint16_t stream;
447 uint16_t sequence;
448 } SCTP_PACKED;
449
450 struct sctp_forward_tsn_msg {
451 struct sctphdr sh;
452 struct sctp_forward_tsn_chunk msg;
453 } SCTP_PACKED;
454
455 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
456
457 #define SCTP_NUM_DB_TO_VERIFY 31
458
459 struct sctp_chunk_desc {
460 uint8_t chunk_type;
461 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
462 uint32_t tsn_ifany;
463 } SCTP_PACKED;
464
465
466 struct sctp_pktdrop_chunk {
467 struct sctp_chunkhdr ch;
468 uint32_t bottle_bw;
469 uint32_t current_onq;
470 uint16_t trunc_len;
471 uint16_t reserved;
472 uint8_t data[];
473 } SCTP_PACKED;
474
475 /**********STREAM RESET STUFF ******************/
476
477 struct sctp_stream_reset_out_request {
478 struct sctp_paramhdr ph;
479 uint32_t request_seq; /* monotonically increasing seq no */
480 uint32_t response_seq; /* if a response, the resp seq no */
481 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */
482 uint16_t list_of_streams[]; /* if not all list of streams */
483 } SCTP_PACKED;
484
485 struct sctp_stream_reset_in_request {
486 struct sctp_paramhdr ph;
487 uint32_t request_seq;
488 uint16_t list_of_streams[]; /* if not all list of streams */
489 } SCTP_PACKED;
490
491
492 struct sctp_stream_reset_tsn_request {
493 struct sctp_paramhdr ph;
494 uint32_t request_seq;
495 } SCTP_PACKED;
496
497 struct sctp_stream_reset_response {
498 struct sctp_paramhdr ph;
499 uint32_t response_seq; /* if a response, the resp seq no */
500 uint32_t result;
501 } SCTP_PACKED;
502
503 struct sctp_stream_reset_response_tsn {
504 struct sctp_paramhdr ph;
505 uint32_t response_seq; /* if a response, the resp seq no */
506 uint32_t result;
507 uint32_t senders_next_tsn;
508 uint32_t receivers_next_tsn;
509 } SCTP_PACKED;
510
511 struct sctp_stream_reset_add_strm {
512 struct sctp_paramhdr ph;
513 uint32_t request_seq;
514 uint16_t number_of_streams;
515 uint16_t reserved;
516 } SCTP_PACKED;
517
518 #define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO 0x00000000 /* XXX: unused */
519 #define SCTP_STREAM_RESET_RESULT_PERFORMED 0x00000001
520 #define SCTP_STREAM_RESET_RESULT_DENIED 0x00000002
521 #define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN 0x00000003 /* XXX: unused */
522 #define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
523 #define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO 0x00000005
524 #define SCTP_STREAM_RESET_RESULT_IN_PROGRESS 0x00000006 /* XXX: unused */
525
526 /*
527 * convience structures, note that if you are making a request for specific
528 * streams then the request will need to be an overlay structure.
529 */
530
531 struct sctp_stream_reset_tsn_req {
532 struct sctp_chunkhdr ch;
533 struct sctp_stream_reset_tsn_request sr_req;
534 } SCTP_PACKED;
535
536 struct sctp_stream_reset_resp {
537 struct sctp_chunkhdr ch;
538 struct sctp_stream_reset_response sr_resp;
539 } SCTP_PACKED;
540
541 /* respone only valid with a TSN request */
542 struct sctp_stream_reset_resp_tsn {
543 struct sctp_chunkhdr ch;
544 struct sctp_stream_reset_response_tsn sr_resp;
545 } SCTP_PACKED;
546
547 /****************************************************/
548
549 /*
550 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
551 */
552
553 /* Should we make the max be 32? */
554 #define SCTP_RANDOM_MAX_SIZE 256
555 struct sctp_auth_random {
556 struct sctp_paramhdr ph;/* type = 0x8002 */
557 uint8_t random_data[];
558 } SCTP_PACKED;
559
560 struct sctp_auth_chunk_list {
561 struct sctp_paramhdr ph;/* type = 0x8003 */
562 uint8_t chunk_types[];
563 } SCTP_PACKED;
564
565 struct sctp_auth_hmac_algo {
566 struct sctp_paramhdr ph;/* type = 0x8004 */
567 uint16_t hmac_ids[];
568 } SCTP_PACKED;
569
570 struct sctp_auth_chunk {
571 struct sctp_chunkhdr ch;
572 uint16_t shared_key_id;
573 uint16_t hmac_id;
574 uint8_t hmac[];
575 } SCTP_PACKED;
576
577 struct sctp_auth_invalid_hmac {
578 struct sctp_paramhdr ph;
579 uint16_t hmac_id;
580 uint16_t padding;
581 } SCTP_PACKED;
582
583 /*
584 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
585 * pieces. If ENCE is missing we could have a couple of blocks. This way we
586 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
587 * data chunk I will split into. We could increase throughput slightly by
588 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I
589 * feel is worth it for now.
590 */
591 #ifndef SCTP_MAX_OVERHEAD
592 #ifdef INET6
593 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
594 sizeof(struct sctphdr) + \
595 sizeof(struct sctp_ecne_chunk) + \
596 sizeof(struct sctp_sack_chunk) + \
597 sizeof(struct ip6_hdr))
598
599 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
600 sizeof(struct sctphdr) + \
601 sizeof(struct ip6_hdr))
602
603
604 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
605 sizeof(struct sctphdr))
606
607 #else
608 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
609 sizeof(struct sctphdr) + \
610 sizeof(struct sctp_ecne_chunk) + \
611 sizeof(struct sctp_sack_chunk) + \
612 sizeof(struct ip))
613
614 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
615 sizeof(struct sctphdr) + \
616 sizeof(struct ip))
617
618
619 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
620 sizeof(struct sctphdr))
621
622 #endif /* INET6 */
623 #endif /* !SCTP_MAX_OVERHEAD */
624
625 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
626 sizeof(struct sctphdr) + \
627 sizeof(struct ip))
628
629 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
630 sizeof(struct sctphdr))
631
632 #if defined(__Windows__)
633 #include <packoff.h>
634 #endif
635 #if defined(__Userspace_os_Windows)
636 #pragma pack ()
637 #endif
638 #undef SCTP_PACKED
639 #endif /* !__sctp_header_h__ */

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