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Annotation of Net2/net/if_dl.h, revision 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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