The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_dl.h

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    1 /*
    2  * Copyright (c) 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: src/sys/net/if_dl.h,v 1.4.8.1 1999/09/05 08:17:36 peter Exp $
   35  */
   36 
   37 #ifndef _NET_IF_DL_H_
   38 #define _NET_IF_DL_H_
   39 
   40 /*
   41  * A Link-Level Sockaddr may specify the interface in one of two
   42  * ways: either by means of a system-provided index number (computed
   43  * anew and possibly differently on every reboot), or by a human-readable
   44  * string such as "il0" (for managerial convenience).
   45  *
   46  * Census taking actions, such as something akin to SIOCGCONF would return
   47  * both the index and the human name.
   48  *
   49  * High volume transactions (such as giving a link-level ``from'' address
   50  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
   51  * form, (which requires fewer copy operations and less space).
   52  *
   53  * The form and interpretation  of the link-level address is purely a matter
   54  * of convention between the device driver and its consumers; however, it is
   55  * expected that all drivers for an interface of a given if_type will agree.
   56  */
   57 
   58 /*
   59  * Structure of a Link-Level sockaddr:
   60  */
   61 struct sockaddr_dl {
   62         u_char  sdl_len;        /* Total length of sockaddr */
   63         u_char  sdl_family;     /* AF_DLI */
   64         u_short sdl_index;      /* if != 0, system given index for interface */
   65         u_char  sdl_type;       /* interface type */
   66         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
   67         u_char  sdl_alen;       /* link level address length */
   68         u_char  sdl_slen;       /* link layer selector length */
   69         char    sdl_data[12];   /* minimum work area, can be larger;
   70                                    contains both if name and ll address */
   71 };
   72 
   73 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
   74 
   75 #ifndef KERNEL
   76 
   77 #include <sys/cdefs.h>
   78 
   79 __BEGIN_DECLS
   80 void    link_addr __P((const char *, struct sockaddr_dl *));
   81 char    *link_ntoa __P((const struct sockaddr_dl *));
   82 __END_DECLS
   83 
   84 #endif /* !KERNEL */
   85 
   86 #endif

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