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Annotation of XNU/bsd/net/if_dl.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1990, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)if_dl.h     8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #ifndef _NET_IF_DL_H_
        !            58: #define _NET_IF_DL_H_
        !            59: 
        !            60: /*
        !            61:  * A Link-Level Sockaddr may specify the interface in one of two
        !            62:  * ways: either by means of a system-provided index number (computed
        !            63:  * anew and possibly differently on every reboot), or by a human-readable
        !            64:  * string such as "il0" (for managerial convenience).
        !            65:  *
        !            66:  * Census taking actions, such as something akin to SIOCGCONF would return
        !            67:  * both the index and the human name.
        !            68:  *
        !            69:  * High volume transactions (such as giving a link-level ``from'' address
        !            70:  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
        !            71:  * form, (which requires fewer copy operations and less space).
        !            72:  *
        !            73:  * The form and interpretation  of the link-level address is purely a matter
        !            74:  * of convention between the device driver and its consumers; however, it is
        !            75:  * expected that all drivers for an interface of a given if_type will agree.
        !            76:  */
        !            77: 
        !            78: /*
        !            79:  * Structure of a Link-Level sockaddr:
        !            80:  */
        !            81: struct sockaddr_dl {
        !            82:        u_char  sdl_len;        /* Total length of sockaddr */
        !            83:        u_char  sdl_family;     /* AF_DLI */
        !            84:        u_short sdl_index;      /* if != 0, system given index for interface */
        !            85:        u_char  sdl_type;       /* interface type */
        !            86:        u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
        !            87:        u_char  sdl_alen;       /* link level address length */
        !            88:        u_char  sdl_slen;       /* link layer selector length */
        !            89:        char    sdl_data[12];   /* minimum work area, can be larger;
        !            90:                                   contains both if name and ll address */
        !            91: };
        !            92: 
        !            93: #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
        !            94: 
        !            95: #ifndef KERNEL
        !            96: 
        !            97: #include <sys/cdefs.h>
        !            98: 
        !            99: __BEGIN_DECLS
        !           100: void   link_addr __P((const char *, struct sockaddr_dl *));
        !           101: char   *link_ntoa __P((const struct sockaddr_dl *));
        !           102: __END_DECLS
        !           103: 
        !           104: #endif /* !KERNEL */
        !           105: 
        !           106: #endif

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