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 */ 79