Line data    Source code

       1             : /*      $OpenBSD: if_dl.h,v 1.12 2017/05/04 15:00:24 bluhm Exp $        */
       2             : /*      $NetBSD: if_dl.h,v 1.8 1995/03/26 20:30:13 jtc Exp $    */
       3             : 
       4             : /*
       5             :  * Copyright (c) 1990, 1993
       6             :  *      The Regents of the University of California.  All rights reserved.
       7             :  *
       8             :  * Redistribution and use in source and binary forms, with or without
       9             :  * modification, are permitted provided that the following conditions
      10             :  * are met:
      11             :  * 1. Redistributions of source code must retain the above copyright
      12             :  *    notice, this list of conditions and the following disclaimer.
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  * 3. Neither the name of the University nor the names of its contributors
      17             :  *    may be used to endorse or promote products derived from this software
      18             :  *    without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      21             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      22             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      23             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      24             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      25             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      26             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      27             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      28             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      29             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      30             :  * SUCH DAMAGE.
      31             :  *
      32             :  *      @(#)if_dl.h     8.1 (Berkeley) 6/10/93
      33             :  */
      34             : 
      35             : /*
      36             :  * A Link-Level Sockaddr may specify the interface in one of two
      37             :  * ways: either by means of a system-provided index number (computed
      38             :  * anew and possibly differently on every reboot), or by a human-readable
      39             :  * string such as "il0" (for managerial convenience).
      40             :  *
      41             :  * Census taking actions, such as something akin to SIOCGCONF would return
      42             :  * both the index and the human name.
      43             :  *
      44             :  * High volume transactions (such as giving a link-level ``from'' address
      45             :  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
      46             :  * form, (which requires fewer copy operations and less space).
      47             :  *
      48             :  * The form and interpretation  of the link-level address is purely a matter
      49             :  * of convention between the device driver and its consumers; however, it is
      50             :  * expected that all drivers for an interface of a given if_type will agree.
      51             :  */
      52             : 
      53             : #ifndef _NET_IF_DL_H_
      54             : #define _NET_IF_DL_H_
      55             : 
      56             : /*
      57             :  * Structure of a Link-Level sockaddr:
      58             :  */
      59             : struct sockaddr_dl {
      60             :         u_char    sdl_len;      /* Total length of sockaddr */
      61             :         u_char    sdl_family;   /* AF_LINK */
      62             :         u_int16_t sdl_index;    /* if != 0, system given index for interface */
      63             :         u_char    sdl_type;     /* interface type */
      64             :         u_char    sdl_nlen;     /* interface name length, no trailing 0 reqd. */
      65             :         u_char    sdl_alen;     /* link level address length */
      66             :         u_char    sdl_slen;     /* link layer selector length, mostly 0 */
      67             :         char      sdl_data[24]; /* minimum work area, can be larger;
      68             :                                    contains both if name and ll address;
      69             :                                    big enough for IFNAMSIZ plus 8byte ll addr */
      70             : };
      71             : 
      72             : #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
      73             : 
      74             : #ifdef _KERNEL
      75             : 
      76             : static inline struct sockaddr_dl *
      77           0 : satosdl(struct sockaddr *sa)
      78             : {
      79           0 :         return ((struct sockaddr_dl *)(sa));
      80             : }
      81             : 
      82             : static inline struct sockaddr *
      83           0 : sdltosa(struct sockaddr_dl *sdl)
      84             : {
      85           0 :         return ((struct sockaddr *)(sdl));
      86             : }
      87             : 
      88             : #else /* _KERNEL */
      89             : 
      90             : __BEGIN_DECLS
      91             : char    *link_ntoa(const struct sockaddr_dl *);
      92             : __END_DECLS
      93             : 
      94             : #endif /* _KERNEL */
      95             : #endif /* _NET_IF_DL_H_ */