dccp.h

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    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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FreeBSD/Linux Kernel Cross Reference sys/netinet/dccp.h

FreeBSD/Linux Kernel Cross Reference
sys/netinet/dccp.h