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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
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California.
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* All rights reserved.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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_UDP_H_
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#define _NETINET_UDP_H_
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#include <sys/types.h>
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/*
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* UDP protocol header.
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* Per RFC 768, September, 1981.
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*/
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struct udphdr {
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u_short uh_sport; /* source port */
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u_short uh_dport; /* destination port */
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u_short uh_ulen; /* udp length */
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u_short uh_sum; /* udp checksum */
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} __packed;
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/*
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* User-settable options (used with setsockopt).
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*/
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#define UDP_ENCAP 1
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/* Start of reserved space for third-party user-settable options. */
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#define UDP_VENDOR SO_VENDOR
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/*
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* UDP Encapsulation of IPsec Packets options.
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*/
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/* Encapsulation types. */
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#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
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#define UDP_ENCAP_ESPINUDP 2 /* RFC3948 */
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/* Default ESP in UDP encapsulation port. */
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#define UDP_ENCAP_ESPINUDP_PORT 500
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/* Maximum UDP fragment size for ESP over UDP. */
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#define UDP_ENCAP_ESPINUDP_MAXFRAGLEN 552
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#endif
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