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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/9.0/sys/net/if_dl.h 139823 2005-01-07 01:45:51Z imp $
   31  */
   32 
   33 #ifndef _NET_IF_DL_H_
   34 #define _NET_IF_DL_H_
   35 
   36 /*
   37  * A Link-Level Sockaddr may specify the interface in one of two
   38  * ways: either by means of a system-provided index number (computed
   39  * anew and possibly differently on every reboot), or by a human-readable
   40  * string such as "il0" (for managerial convenience).
   41  *
   42  * Census taking actions, such as something akin to SIOCGCONF would return
   43  * both the index and the human name.
   44  *
   45  * High volume transactions (such as giving a link-level ``from'' address
   46  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
   47  * form, (which requires fewer copy operations and less space).
   48  *
   49  * The form and interpretation  of the link-level address is purely a matter
   50  * of convention between the device driver and its consumers; however, it is
   51  * expected that all drivers for an interface of a given if_type will agree.
   52  */
   53 
   54 /*
   55  * Structure of a Link-Level sockaddr:
   56  */
   57 struct sockaddr_dl {
   58         u_char  sdl_len;        /* Total length of sockaddr */
   59         u_char  sdl_family;     /* AF_LINK */
   60         u_short sdl_index;      /* if != 0, system given index for interface */
   61         u_char  sdl_type;       /* interface type */
   62         u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
   63         u_char  sdl_alen;       /* link level address length */
   64         u_char  sdl_slen;       /* link layer selector length */
   65         char    sdl_data[46];   /* minimum work area, can be larger;
   66                                    contains both if name and ll address */
   67 };
   68 
   69 #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
   70 
   71 #ifndef _KERNEL
   72 
   73 #include <sys/cdefs.h>
   74 
   75 __BEGIN_DECLS
   76 void    link_addr(const char *, struct sockaddr_dl *);
   77 char    *link_ntoa(const struct sockaddr_dl *);
   78 __END_DECLS
   79 
   80 #endif /* !_KERNEL */
   81 
   82 #endif

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