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Add header definition for RFC4340, Datagram Congestion Control Protocol

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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
This commit is contained in:
thj 2020-06-17 13:27:13 +00:00
parent 6e6f9637cd
commit 4783ffbc96
1 changed files with 78 additions and 0 deletions
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78
sys/netinet/dccp.h Normal file
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Tom Jones <thj@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _NETINET_DCCP_H_
#define _NETINET_DCCP_H_
/* DCCP protocol header as per RFC4340 */
struct dccphdr {
uint16_t d_sport;
uint16_t d_dport;
uint8_t d_doff;
#if BYTE_ORDER == LITTLE_ENDIAN
uint8_t d_cscov:4,
d_ccval:4;
#endif
#if BYTE_ORDER == BIG_ENDIAN
uint8_t d_ccval:4,
d_cscov:4;
#endif
uint8_t d_cksum[2];
#if BYTE_ORDER == LITTLE_ENDIAN
uint8_t d_res:3,
d_type:4,
d_x:1;
#endif
#if BYTE_ORDER == BIG_ENDIAN
uint8_t d_x:1,
d_type:4,
d_res:3;
#endif
/*
* Provide enough space for both the short (24 bit) sequence number and
* the long (48 bit) sequene number and a leading reserved byte in
* front of the long sequence number.
*/
union dccp_seqno {
uint8_t shortseq[3];
struct dccp_long_seqno {
uint8_t res;
uint8_t seq[6];
} longseq;
} d_seqno;
};
#define d_seqno_short d_seqno.shortseq;
#define d_seqno_long d_seqno.longseq.seq;
#define DCCP_SHORTHDR 12
#define DCCP_LONGHDR 16
#define DCCP_EXTHDR 0x80
#endif /* _NETINET_DCCP_H */