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Annotation of sys/net/if_dl.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: if_dl.h,v 1.6 2003/06/02 23:28:12 millert 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 */
                     67:        char      sdl_data[12]; /* minimum work area, can be larger;
                     68:                                   contains both if name and ll address */
                     69: };
                     70:
                     71: #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
                     72:
                     73: #ifndef _KERNEL
                     74:
                     75: #include <sys/cdefs.h>
                     76:
                     77: __BEGIN_DECLS
                     78: void   link_addr(const char *, struct sockaddr_dl *);
                     79: char   *link_ntoa(const struct sockaddr_dl *);
                     80: __END_DECLS
                     81:
                     82: #endif /* _KERNEL */
                     83: #endif /* _NET_IF_DL_H_ */