1 /*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
4 * Copyright (c) 2008-2011, 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 /* $KAME: sctp_header.h,v 1.14 2005/03/06 16:04:17 itojun Exp $ */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/sctp_header.h 228037 2011-11-27 19:13:45Z tuexen $");
37
38 #ifndef __sctp_header_h__
39 #define __sctp_header_h__
40
41 #include <sys/time.h>
42 #include <netinet/sctp.h>
43 #include <netinet/sctp_constants.h>
44
45 #define SCTP_PACKED __attribute__((packed))
46
47 /*
48 * Parameter structures
49 */
50 struct sctp_ipv4addr_param {
51 struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */
52 uint32_t addr; /* IPV4 address */
53 } SCTP_PACKED;
54
55 #define SCTP_V6_ADDR_BYTES 16
56
57
58 struct sctp_ipv6addr_param {
59 struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */
60 uint8_t addr[SCTP_V6_ADDR_BYTES]; /* IPV6 address */
61 } SCTP_PACKED;
62
63 /* Cookie Preservative */
64 struct sctp_cookie_perserve_param {
65 struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */
66 uint32_t time; /* time in ms to extend cookie */
67 } SCTP_PACKED;
68
69 #define SCTP_ARRAY_MIN_LEN 1
70 /* Host Name Address */
71 struct sctp_host_name_param {
72 struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */
73 char name[SCTP_ARRAY_MIN_LEN]; /* host name */
74 } SCTP_PACKED;
75
76 /*
77 * This is the maximum padded size of a s-a-p
78 * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12
79 */
80 #define SCTP_MAX_ADDR_PARAMS_SIZE 12
81 /* supported address type */
82 struct sctp_supported_addr_param {
83 struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */
84 uint16_t addr_type[2]; /* array of supported address types */
85 } SCTP_PACKED;
86
87 /* ECN parameter */
88 struct sctp_ecn_supported_param {
89 struct sctp_paramhdr ph;/* type=SCTP_ECN_CAPABLE */
90 } SCTP_PACKED;
91
92
93 /* heartbeat info parameter */
94 struct sctp_heartbeat_info_param {
95 struct sctp_paramhdr ph;
96 uint32_t time_value_1;
97 uint32_t time_value_2;
98 uint32_t random_value1;
99 uint32_t random_value2;
100 uint8_t addr_family;
101 uint8_t addr_len;
102 /* make sure that this structure is 4 byte aligned */
103 uint8_t padding[2];
104 char address[SCTP_ADDRMAX];
105 } SCTP_PACKED;
106
107
108 /* draft-ietf-tsvwg-prsctp */
109 /* PR-SCTP supported parameter */
110 struct sctp_prsctp_supported_param {
111 struct sctp_paramhdr ph;
112 } SCTP_PACKED;
113
114
115 /* draft-ietf-tsvwg-addip-sctp */
116 struct sctp_asconf_paramhdr { /* an ASCONF "parameter" */
117 struct sctp_paramhdr ph;/* a SCTP parameter header */
118 uint32_t correlation_id;/* correlation id for this param */
119 } SCTP_PACKED;
120
121 struct sctp_asconf_addr_param { /* an ASCONF address parameter */
122 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
123 struct sctp_ipv6addr_param addrp; /* max storage size */
124 } SCTP_PACKED;
125
126
127 struct sctp_asconf_tag_param { /* an ASCONF NAT-Vtag parameter */
128 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
129 uint32_t local_vtag;
130 uint32_t remote_vtag;
131 } SCTP_PACKED;
132
133
134 struct sctp_asconf_addrv4_param { /* an ASCONF address (v4) parameter */
135 struct sctp_asconf_paramhdr aph; /* asconf "parameter" */
136 struct sctp_ipv4addr_param addrp; /* max storage size */
137 } SCTP_PACKED;
138
139 #define SCTP_MAX_SUPPORTED_EXT 256
140
141 struct sctp_supported_chunk_types_param {
142 struct sctp_paramhdr ph;/* type = 0x8008 len = x */
143 uint8_t chunk_types[];
144 } SCTP_PACKED;
145
146
147 /*
148 * Structures for DATA chunks
149 */
150 struct sctp_data {
151 uint32_t tsn;
152 uint16_t stream_id;
153 uint16_t stream_sequence;
154 uint32_t protocol_id;
155 /* user data follows */
156 } SCTP_PACKED;
157
158 struct sctp_data_chunk {
159 struct sctp_chunkhdr ch;
160 struct sctp_data dp;
161 } SCTP_PACKED;
162
163 /*
164 * Structures for the control chunks
165 */
166
167 /* Initiate (INIT)/Initiate Ack (INIT ACK) */
168 struct sctp_init {
169 uint32_t initiate_tag; /* initiate tag */
170 uint32_t a_rwnd; /* a_rwnd */
171 uint16_t num_outbound_streams; /* OS */
172 uint16_t num_inbound_streams; /* MIS */
173 uint32_t initial_tsn; /* I-TSN */
174 /* optional param's follow */
175 } SCTP_PACKED;
176
177 #define SCTP_IDENTIFICATION_SIZE 16
178 #define SCTP_ADDRESS_SIZE 4
179 #define SCTP_RESERVE_SPACE 6
180 /* state cookie header */
181 struct sctp_state_cookie { /* this is our definition... */
182 uint8_t identification[SCTP_IDENTIFICATION_SIZE]; /* id of who we are */
183 struct timeval time_entered; /* the time I built cookie */
184 uint32_t cookie_life; /* life I will award this cookie */
185 uint32_t tie_tag_my_vtag; /* my tag in old association */
186
187 uint32_t tie_tag_peer_vtag; /* peers tag in old association */
188 uint32_t peers_vtag; /* peers tag in INIT (for quick ref) */
189
190 uint32_t my_vtag; /* my tag in INIT-ACK (for quick ref) */
191 uint32_t address[SCTP_ADDRESS_SIZE]; /* 4 ints/128 bits */
192 uint32_t addr_type; /* address type */
193 uint32_t laddress[SCTP_ADDRESS_SIZE]; /* my local from address */
194 uint32_t laddr_type; /* my local from address type */
195 uint32_t scope_id; /* v6 scope id for link-locals */
196
197 uint16_t peerport; /* port address of the peer in the INIT */
198 uint16_t myport; /* my port address used in the INIT */
199 uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
200 uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
201 uint8_t local_scope; /* IPv6 local scope flag */
202 uint8_t site_scope; /* IPv6 site scope flag */
203
204 uint8_t ipv4_scope; /* IPv4 private addr scope */
205 uint8_t loopback_scope; /* loopback scope information */
206 uint8_t reserved[SCTP_RESERVE_SPACE]; /* Align to 64 bits */
207 /*
208 * at the end is tacked on the INIT chunk and the INIT-ACK chunk
209 * (minus the cookie).
210 */
211 } SCTP_PACKED;
212
213
214 /* Used for NAT state error cause */
215 struct sctp_missing_nat_state {
216 uint16_t cause;
217 uint16_t length;
218 uint8_t data[];
219 } SCTP_PACKED;
220
221
222 struct sctp_inv_mandatory_param {
223 uint16_t cause;
224 uint16_t length;
225 uint32_t num_param;
226 uint16_t param;
227 /*
228 * We include this to 0 it since only a missing cookie will cause
229 * this error.
230 */
231 uint16_t resv;
232 } SCTP_PACKED;
233
234 struct sctp_unresolv_addr {
235 uint16_t cause;
236 uint16_t length;
237 uint16_t addr_type;
238 uint16_t reserved; /* Only one invalid addr type */
239 } SCTP_PACKED;
240
241 /* state cookie parameter */
242 struct sctp_state_cookie_param {
243 struct sctp_paramhdr ph;
244 struct sctp_state_cookie cookie;
245 } SCTP_PACKED;
246
247 struct sctp_init_chunk {
248 struct sctp_chunkhdr ch;
249 struct sctp_init init;
250 } SCTP_PACKED;
251
252 struct sctp_init_msg {
253 struct sctphdr sh;
254 struct sctp_init_chunk msg;
255 } SCTP_PACKED;
256
257 /* ... used for both INIT and INIT ACK */
258 #define sctp_init_ack sctp_init
259 #define sctp_init_ack_chunk sctp_init_chunk
260 #define sctp_init_ack_msg sctp_init_msg
261
262
263 /* Selective Ack (SACK) */
264 struct sctp_gap_ack_block {
265 uint16_t start; /* Gap Ack block start */
266 uint16_t end; /* Gap Ack block end */
267 } SCTP_PACKED;
268
269 struct sctp_sack {
270 uint32_t cum_tsn_ack; /* cumulative TSN Ack */
271 uint32_t a_rwnd; /* updated a_rwnd of sender */
272 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */
273 uint16_t num_dup_tsns; /* number of duplicate TSNs */
274 /* struct sctp_gap_ack_block's follow */
275 /* uint32_t duplicate_tsn's follow */
276 } SCTP_PACKED;
277
278 struct sctp_sack_chunk {
279 struct sctp_chunkhdr ch;
280 struct sctp_sack sack;
281 } SCTP_PACKED;
282
283 struct sctp_nr_sack {
284 uint32_t cum_tsn_ack; /* cumulative TSN Ack */
285 uint32_t a_rwnd; /* updated a_rwnd of sender */
286 uint16_t num_gap_ack_blks; /* number of Gap Ack blocks */
287 uint16_t num_nr_gap_ack_blks; /* number of NR Gap Ack blocks */
288 uint16_t num_dup_tsns; /* number of duplicate TSNs */
289 uint16_t reserved; /* not currently used */
290 /* struct sctp_gap_ack_block's follow */
291 /* uint32_t duplicate_tsn's follow */
292 } SCTP_PACKED;
293
294 struct sctp_nr_sack_chunk {
295 struct sctp_chunkhdr ch;
296 struct sctp_nr_sack nr_sack;
297 } SCTP_PACKED;
298
299
300 /* Heartbeat Request (HEARTBEAT) */
301 struct sctp_heartbeat {
302 struct sctp_heartbeat_info_param hb_info;
303 } SCTP_PACKED;
304
305 struct sctp_heartbeat_chunk {
306 struct sctp_chunkhdr ch;
307 struct sctp_heartbeat heartbeat;
308 } SCTP_PACKED;
309
310 /* ... used for Heartbeat Ack (HEARTBEAT ACK) */
311 #define sctp_heartbeat_ack sctp_heartbeat
312 #define sctp_heartbeat_ack_chunk sctp_heartbeat_chunk
313
314
315 /* Abort Asssociation (ABORT) */
316 struct sctp_abort_chunk {
317 struct sctp_chunkhdr ch;
318 /* optional error cause may follow */
319 } SCTP_PACKED;
320
321 struct sctp_abort_msg {
322 struct sctphdr sh;
323 struct sctp_abort_chunk msg;
324 } SCTP_PACKED;
325
326
327 /* Shutdown Association (SHUTDOWN) */
328 struct sctp_shutdown_chunk {
329 struct sctp_chunkhdr ch;
330 uint32_t cumulative_tsn_ack;
331 } SCTP_PACKED;
332
333
334 /* Shutdown Acknowledgment (SHUTDOWN ACK) */
335 struct sctp_shutdown_ack_chunk {
336 struct sctp_chunkhdr ch;
337 } SCTP_PACKED;
338
339
340 /* Operation Error (ERROR) */
341 struct sctp_error_chunk {
342 struct sctp_chunkhdr ch;
343 /* optional error causes follow */
344 } SCTP_PACKED;
345
346
347 /* Cookie Echo (COOKIE ECHO) */
348 struct sctp_cookie_echo_chunk {
349 struct sctp_chunkhdr ch;
350 struct sctp_state_cookie cookie;
351 } SCTP_PACKED;
352
353 /* Cookie Acknowledgment (COOKIE ACK) */
354 struct sctp_cookie_ack_chunk {
355 struct sctp_chunkhdr ch;
356 } SCTP_PACKED;
357
358 /* Explicit Congestion Notification Echo (ECNE) */
359 struct old_sctp_ecne_chunk {
360 struct sctp_chunkhdr ch;
361 uint32_t tsn;
362 } SCTP_PACKED;
363
364 struct sctp_ecne_chunk {
365 struct sctp_chunkhdr ch;
366 uint32_t tsn;
367 uint32_t num_pkts_since_cwr;
368 } SCTP_PACKED;
369
370 /* Congestion Window Reduced (CWR) */
371 struct sctp_cwr_chunk {
372 struct sctp_chunkhdr ch;
373 uint32_t tsn;
374 } SCTP_PACKED;
375
376 /* Shutdown Complete (SHUTDOWN COMPLETE) */
377 struct sctp_shutdown_complete_chunk {
378 struct sctp_chunkhdr ch;
379 } SCTP_PACKED;
380
381 /* Oper error holding a stale cookie */
382 struct sctp_stale_cookie_msg {
383 struct sctp_paramhdr ph;/* really an error cause */
384 uint32_t time_usec;
385 } SCTP_PACKED;
386
387 struct sctp_adaptation_layer_indication {
388 struct sctp_paramhdr ph;
389 uint32_t indication;
390 } SCTP_PACKED;
391
392 struct sctp_cookie_while_shutting_down {
393 struct sctphdr sh;
394 struct sctp_chunkhdr ch;
395 struct sctp_paramhdr ph;/* really an error cause */
396 } SCTP_PACKED;
397
398 struct sctp_shutdown_complete_msg {
399 struct sctphdr sh;
400 struct sctp_shutdown_complete_chunk shut_cmp;
401 } SCTP_PACKED;
402
403 /*
404 * draft-ietf-tsvwg-addip-sctp
405 */
406 /* Address/Stream Configuration Change (ASCONF) */
407 struct sctp_asconf_chunk {
408 struct sctp_chunkhdr ch;
409 uint32_t serial_number;
410 /* lookup address parameter (mandatory) */
411 /* asconf parameters follow */
412 } SCTP_PACKED;
413
414 /* Address/Stream Configuration Acknowledge (ASCONF ACK) */
415 struct sctp_asconf_ack_chunk {
416 struct sctp_chunkhdr ch;
417 uint32_t serial_number;
418 /* asconf parameters follow */
419 } SCTP_PACKED;
420
421 /* draft-ietf-tsvwg-prsctp */
422 /* Forward Cumulative TSN (FORWARD TSN) */
423 struct sctp_forward_tsn_chunk {
424 struct sctp_chunkhdr ch;
425 uint32_t new_cumulative_tsn;
426 /* stream/sequence pairs (sctp_strseq) follow */
427 } SCTP_PACKED;
428
429 struct sctp_strseq {
430 uint16_t stream;
431 uint16_t sequence;
432 } SCTP_PACKED;
433
434 struct sctp_forward_tsn_msg {
435 struct sctphdr sh;
436 struct sctp_forward_tsn_chunk msg;
437 } SCTP_PACKED;
438
439 /* should be a multiple of 4 - 1 aka 3/7/11 etc. */
440
441 #define SCTP_NUM_DB_TO_VERIFY 31
442
443 struct sctp_chunk_desc {
444 uint8_t chunk_type;
445 uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
446 uint32_t tsn_ifany;
447 } SCTP_PACKED;
448
449
450 struct sctp_pktdrop_chunk {
451 struct sctp_chunkhdr ch;
452 uint32_t bottle_bw;
453 uint32_t current_onq;
454 uint16_t trunc_len;
455 uint16_t reserved;
456 uint8_t data[];
457 } SCTP_PACKED;
458
459 /**********STREAM RESET STUFF ******************/
460
461 struct sctp_stream_reset_out_request {
462 struct sctp_paramhdr ph;
463 uint32_t request_seq; /* monotonically increasing seq no */
464 uint32_t response_seq; /* if a response, the resp seq no */
465 uint32_t send_reset_at_tsn; /* last TSN I assigned outbound */
466 uint16_t list_of_streams[]; /* if not all list of streams */
467 } SCTP_PACKED;
468
469 struct sctp_stream_reset_in_request {
470 struct sctp_paramhdr ph;
471 uint32_t request_seq;
472 uint16_t list_of_streams[]; /* if not all list of streams */
473 } SCTP_PACKED;
474
475
476 struct sctp_stream_reset_tsn_request {
477 struct sctp_paramhdr ph;
478 uint32_t request_seq;
479 } SCTP_PACKED;
480
481 struct sctp_stream_reset_response {
482 struct sctp_paramhdr ph;
483 uint32_t response_seq; /* if a response, the resp seq no */
484 uint32_t result;
485 } SCTP_PACKED;
486
487 struct sctp_stream_reset_response_tsn {
488 struct sctp_paramhdr ph;
489 uint32_t response_seq; /* if a response, the resp seq no */
490 uint32_t result;
491 uint32_t senders_next_tsn;
492 uint32_t receivers_next_tsn;
493 } SCTP_PACKED;
494
495 struct sctp_stream_reset_add_strm {
496 struct sctp_paramhdr ph;
497 uint32_t request_seq;
498 uint16_t number_of_streams;
499 uint16_t reserved;
500 } SCTP_PACKED;
501
502 #define SCTP_STREAM_RESET_NOTHING 0x00000000 /* Nothing for me to do */
503 #define SCTP_STREAM_RESET_PERFORMED 0x00000001 /* Did it */
504 #define SCTP_STREAM_RESET_DENIED 0x00000002 /* refused to do it */
505 #define SCTP_STREAM_RESET_ERROR_STR 0x00000003 /* bad Stream no */
506 #define SCTP_STREAM_RESET_TRY_LATER 0x00000004 /* collision, try again */
507 #define SCTP_STREAM_RESET_BAD_SEQNO 0x00000005 /* bad str-reset seq no */
508
509 /*
510 * convience structures, note that if you are making a request for specific
511 * streams then the request will need to be an overlay structure.
512 */
513
514 struct sctp_stream_reset_out_req {
515 struct sctp_chunkhdr ch;
516 struct sctp_stream_reset_out_request sr_req;
517 } SCTP_PACKED;
518
519 struct sctp_stream_reset_in_req {
520 struct sctp_chunkhdr ch;
521 struct sctp_stream_reset_in_request sr_req;
522 } SCTP_PACKED;
523
524 struct sctp_stream_reset_tsn_req {
525 struct sctp_chunkhdr ch;
526 struct sctp_stream_reset_tsn_request sr_req;
527 } SCTP_PACKED;
528
529 struct sctp_stream_reset_resp {
530 struct sctp_chunkhdr ch;
531 struct sctp_stream_reset_response sr_resp;
532 } SCTP_PACKED;
533
534 /* respone only valid with a TSN request */
535 struct sctp_stream_reset_resp_tsn {
536 struct sctp_chunkhdr ch;
537 struct sctp_stream_reset_response_tsn sr_resp;
538 } SCTP_PACKED;
539
540 /****************************************************/
541
542 /*
543 * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
544 */
545
546 /* Should we make the max be 32? */
547 #define SCTP_RANDOM_MAX_SIZE 256
548 struct sctp_auth_random {
549 struct sctp_paramhdr ph;/* type = 0x8002 */
550 uint8_t random_data[];
551 } SCTP_PACKED;
552
553 struct sctp_auth_chunk_list {
554 struct sctp_paramhdr ph;/* type = 0x8003 */
555 uint8_t chunk_types[];
556 } SCTP_PACKED;
557
558 struct sctp_auth_hmac_algo {
559 struct sctp_paramhdr ph;/* type = 0x8004 */
560 uint16_t hmac_ids[];
561 } SCTP_PACKED;
562
563 struct sctp_auth_chunk {
564 struct sctp_chunkhdr ch;
565 uint16_t shared_key_id;
566 uint16_t hmac_id;
567 uint8_t hmac[];
568 } SCTP_PACKED;
569
570 struct sctp_auth_invalid_hmac {
571 struct sctp_paramhdr ph;
572 uint16_t hmac_id;
573 uint16_t padding;
574 } SCTP_PACKED;
575
576 /*
577 * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
578 * pieces. If ENCE is missing we could have a couple of blocks. This way we
579 * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
580 * data chunk I will split into. We could increase throughput slightly by
581 * taking out these two but the 24-sack/8-CWR i.e. 32 bytes I pre-reserve I
582 * feel is worth it for now.
583 */
584 #ifndef SCTP_MAX_OVERHEAD
585 #ifdef INET6
586 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
587 sizeof(struct sctphdr) + \
588 sizeof(struct sctp_ecne_chunk) + \
589 sizeof(struct sctp_sack_chunk) + \
590 sizeof(struct ip6_hdr))
591
592 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
593 sizeof(struct sctphdr) + \
594 sizeof(struct ip6_hdr))
595
596
597 #define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
598 sizeof(struct sctphdr))
599
600 #else
601 #define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
602 sizeof(struct sctphdr) + \
603 sizeof(struct sctp_ecne_chunk) + \
604 sizeof(struct sctp_sack_chunk) + \
605 sizeof(struct ip))
606
607 #define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
608 sizeof(struct sctphdr) + \
609 sizeof(struct ip))
610
611
612 #define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
613 sizeof(struct sctphdr))
614
615 #endif /* INET6 */
616 #endif /* !SCTP_MAX_OVERHEAD */
617
618 #define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
619 sizeof(struct sctphdr) + \
620 sizeof(struct ip))
621
622 #define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
623 sizeof(struct sctphdr))
624
625 #undef SCTP_PACKED
626 #endif /* !__sctp_header_h__ */
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