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9ee759f367
The C language only allows pointer casting to another type if both sides have compatible alignments, unaligned casts causes undefined behavior. Since we do not have declared (and therefore not checked) mbuf alignments for the various input functions in the IP stack, the worst case (alignment to char*) should be expected. A lot of work still needs to be done on IPv6, especially on the terrible accesses to in6_addr members. It should have no performance impact on all unaligned architectures. MFC after: 1 month Reviewed by: kib PR: 272965 Differential Revision: https://reviews.freebsd.org/D50103
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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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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#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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} __packed;
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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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