fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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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* @(#)if_dl.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IF_DL_H_
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#define _NET_IF_DL_H_
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/*
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* A Link-Level Sockaddr may specify the interface in one of two
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* ways: either by means of a system-provided index number (computed
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* anew and possibly differently on every reboot), or by a human-readable
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* string such as "il0" (for managerial convenience).
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*
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* Census taking actions, such as something akin to SIOCGCONF would return
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* both the index and the human name.
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*
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* High volume transactions (such as giving a link-level ``from'' address
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* in a recvfrom or recvmsg call) may be likely only to provide the indexed
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* form, (which requires fewer copy operations and less space).
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*
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* The form and interpretation of the link-level address is purely a matter
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* of convention between the device driver and its consumers; however, it is
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* expected that all drivers for an interface of a given if_type will agree.
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*/
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/*
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* Structure of a Link-Level sockaddr:
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*/
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struct sockaddr_dl {
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u_char sdl_len; /* Total length of sockaddr */
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u_char sdl_family; /* AF_LINK */
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u_short sdl_index; /* if != 0, system given index for interface */
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u_char sdl_type; /* interface type */
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u_char sdl_nlen; /* interface name length, no trailing 0 reqd. */
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u_char sdl_alen; /* link level address length */
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u_char sdl_slen; /* link layer selector length */
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char sdl_data[46]; /* minimum work area, can be larger;
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contains both if name and ll address */
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};
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#define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
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#define CLLADDR(s) ((c_caddr_t)((s)->sdl_data + (s)->sdl_nlen))
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#define LLINDEX(s) ((s)->sdl_index)
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struct ifnet;
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struct sockaddr_dl *link_alloc_sdl(size_t, int);
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void link_free_sdl(struct sockaddr *sa);
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struct sockaddr_dl *link_init_sdl(struct ifnet *, struct sockaddr *, u_char);
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#ifndef _KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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void link_addr(const char *, struct sockaddr_dl *);
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char *link_ntoa(const struct sockaddr_dl *);
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__END_DECLS
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#endif /* !_KERNEL */
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#endif
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