4783ffbc96
Add a header definition for DCCP as defined in RFC4340. This header definition is required to perform validation when receiving and forwarding DCCP packets. We do not currently support DCCP. Reviewed by: gallatin, bz Approved by: bz (co-mentor) MFC after: 1 week MFC with: 350749 Differential Revision: https://reviews.freebsd.org/D21179
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 Tom Jones <thj@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NETINET_DCCP_H_
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#define _NETINET_DCCP_H_
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/* DCCP protocol header as per RFC4340 */
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struct dccphdr {
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uint16_t d_sport;
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uint16_t d_dport;
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uint8_t d_doff;
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#if BYTE_ORDER == LITTLE_ENDIAN
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uint8_t d_cscov:4,
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d_ccval:4;
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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uint8_t d_ccval:4,
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d_cscov:4;
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#endif
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uint8_t d_cksum[2];
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#if BYTE_ORDER == LITTLE_ENDIAN
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uint8_t d_res:3,
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d_type:4,
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d_x:1;
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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uint8_t d_x:1,
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d_type:4,
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d_res:3;
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#endif
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/*
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* Provide enough space for both the short (24 bit) sequence number and
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* the long (48 bit) sequene number and a leading reserved byte in
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* front of the long sequence number.
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*/
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union dccp_seqno {
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uint8_t shortseq[3];
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struct dccp_long_seqno {
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uint8_t res;
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uint8_t seq[6];
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} longseq;
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} d_seqno;
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};
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#define d_seqno_short d_seqno.shortseq;
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#define d_seqno_long d_seqno.longseq.seq;
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#define DCCP_SHORTHDR 12
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#define DCCP_LONGHDR 16
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#define DCCP_EXTHDR 0x80
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#endif /* _NETINET_DCCP_H */
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