FreeBSD/Linux Kernel Cross Reference
sys/netinet/dccp.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
28 */
29
30 #ifndef _NETINET_DCCP_H_
31 #define _NETINET_DCCP_H_
32
33 /* DCCP protocol header as per RFC4340 */
34 struct dccphdr {
35 uint16_t d_sport;
36 uint16_t d_dport;
37 uint8_t d_doff;
38 #if BYTE_ORDER == LITTLE_ENDIAN
39 uint8_t d_cscov:4,
40 d_ccval:4;
41 #endif
42 #if BYTE_ORDER == BIG_ENDIAN
43 uint8_t d_ccval:4,
44 d_cscov:4;
45 #endif
46 uint8_t d_cksum[2];
47 #if BYTE_ORDER == LITTLE_ENDIAN
48 uint8_t d_res:3,
49 d_type:4,
50 d_x:1;
51 #endif
52 #if BYTE_ORDER == BIG_ENDIAN
53 uint8_t d_x:1,
54 d_type:4,
55 d_res:3;
56 #endif
57 /*
58 * Provide enough space for both the short (24 bit) sequence number and
59 * the long (48 bit) sequene number and a leading reserved byte in
60 * front of the long sequence number.
61 */
62 union dccp_seqno {
63 uint8_t shortseq[3];
64 struct dccp_long_seqno {
65 uint8_t res;
66 uint8_t seq[6];
67 } longseq;
68 } d_seqno;
69 };
70
71 #define d_seqno_short d_seqno.shortseq;
72 #define d_seqno_long d_seqno.longseq.seq;
73
74 #define DCCP_SHORTHDR 12
75 #define DCCP_LONGHDR 16
76 #define DCCP_EXTHDR 0x80
77
78 #endif /* _NETINET_DCCP_H */
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