1/*-
 2 * SPDX-License-Identifier: BSD-2-Clause
 3 *
 4 * Copyright (c) 2019 Tom Jones <thj@freebsd.org>
 5 *
 6 * Redistribution and use in source and binary forms, with or without
 7 * modification, are permitted provided that the following conditions
 8 * are met:
 9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef _NETINET_DCCP_H_
29#define _NETINET_DCCP_H_
30
31/* DCCP protocol header as per RFC4340 */
32struct dccphdr {
33	uint16_t	d_sport;
34	uint16_t	d_dport;
35	uint8_t		d_doff;
36#if BYTE_ORDER == LITTLE_ENDIAN
37	uint8_t		d_cscov:4,
38			d_ccval:4;
39#endif
40#if BYTE_ORDER == BIG_ENDIAN
41	uint8_t		d_ccval:4,
42			d_cscov:4;
43#endif
44	uint8_t		d_cksum[2];
45#if BYTE_ORDER == LITTLE_ENDIAN
46	uint8_t		d_res:3,
47			d_type:4,
48			d_x:1;
49#endif
50#if BYTE_ORDER == BIG_ENDIAN
51	uint8_t		d_x:1,
52			d_type:4,
53			d_res:3;
54#endif
55       /*
56        * Provide enough space for both the short (24 bit) sequence number and
57        * the long (48 bit) sequene number and a leading reserved byte in
58        * front of the long sequence number.
59        */
60       union dccp_seqno {
61               uint8_t shortseq[3];
62               struct dccp_long_seqno {
63                       uint8_t res;
64                       uint8_t seq[6];
65               } longseq;
66       } d_seqno;
67};
68
69#define d_seqno_short d_seqno.shortseq;
70#define d_seqno_long d_seqno.longseq.seq;
71
72#define DCCP_SHORTHDR	12
73#define DCCP_LONGHDR	16
74#define DCCP_EXTHDR	0x80
75
76#endif /* _NETINET_DCCP_H */