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 */ 32 struct 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 */ 77