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 /*      $NetBSD: if_dl.h,v 1.14 2005/02/26 22:45:09 perry Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 /*
   35  * A Link-Level Sockaddr may specify the interface in one of two
   36  * ways: either by means of a system-provided index number (computed
   37  * anew and possibly differently on every reboot), or by a human-readable
   38  * string such as "il0" (for managerial convenience).
   39  *
   40  * Census taking actions, such as something akin to SIOCGCONF would return
   41  * both the index and the human name.
   42  *
   43  * High volume transactions (such as giving a link-level ``from'' address
   44  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
   45  * form, (which requires fewer copy operations and less space).
   46  *
   47  * The form and interpretation  of the link-level address is purely a matter
   48  * of convention between the device driver and its consumers; however, it is
   49  * expected that all drivers for an interface of a given if_type will agree.
   50  */
   51 
   52 #ifndef _NET_IF_DL_H_
   53 #define _NET_IF_DL_H_
   54 
   55 #include <sys/ansi.h>
   56 
   57 #ifndef sa_family_t
   58 typedef __sa_family_t   sa_family_t;
   59 #define sa_family_t     __sa_family_t
   60 #endif
   61 
   62 /*
   63  * Structure of a Link-Level sockaddr:
   64  */
   65 struct sockaddr_dl {
   66         u_char      sdl_len;    /* Total length of sockaddr */
   67         sa_family_t sdl_family; /* AF_LINK */
   68         u_int16_t   sdl_index;  /* if != 0, system given index for interface */
   69         u_char      sdl_type;   /* interface type */
   70         u_char      sdl_nlen;   /* interface name length, no trailing 0 reqd. */
   71         u_char      sdl_alen;   /* link level address length */
   72         u_char      sdl_slen;   /* link layer selector length */
   73         char        sdl_data[12]; /* minimum work area, can be larger;
   74                                      contains both if name and ll address */
   75 };
   76 
   77 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
   78 
   79 #ifndef _KERNEL
   80 
   81 #include <sys/cdefs.h>
   82 
   83 __BEGIN_DECLS
   84 void    link_addr __P((const char *, struct sockaddr_dl *));
   85 char    *link_ntoa __P((const struct sockaddr_dl *));
   86 __END_DECLS
   87 
   88 #endif /* !_KERNEL */
   89 
   90 #endif /* _NET_IF_DL_H_ */

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