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Annotation of Net2/net/if_dl.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1990 Regents of the University of California.
                      3:  * 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     7.2 (Berkeley) 2/22/91
                     34:  */
                     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_DLI */
                     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[12];   /* 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 __P((const char *, struct sockaddr_dl *));
                     77: char   *link_ntoa __P((const struct sockaddr_dl *));
                     78: __END_DECLS
                     79: 
                     80: #endif /* !KERNEL */

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