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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)if_dl.h     7.1 (Berkeley) 7/1/90
        !            21:  */
        !            22: 
        !            23: /* 
        !            24:  * A Link-Level Sockaddr may specify the interface in one of two
        !            25:  * ways: either by means of a system-provided index number (computed
        !            26:  * anew and possibly differently on every reboot), or by a human-readable
        !            27:  * string such as "il0" (for managerial convenience).
        !            28:  * 
        !            29:  * Census taking actions, such as something akin to SIOCGCONF would return
        !            30:  * both the index and the human name.
        !            31:  * 
        !            32:  * High volume transactions (such as giving a link-level ``from'' address
        !            33:  * in a recvfrom or recvmsg call) may be likely only to provide the indexed
        !            34:  * form, (which requires fewer copy operations and less space).
        !            35:  * 
        !            36:  * The form and interpretation  of the link-level address is purely a matter
        !            37:  * of convention between the device driver and its consumers; however, it is
        !            38:  * expected that all drivers for an interface of a given if_type will agree.
        !            39:  */
        !            40: 
        !            41: /*
        !            42:  * Structure of a Link-Level sockaddr:
        !            43:  */
        !            44: struct sockaddr_dl {
        !            45:        u_char  sdl_len;        /* Total length of sockaddr */
        !            46:        u_char  sdl_family;     /* AF_DLI */
        !            47:        u_short sdl_index;      /* if != 0, system given index for interface */
        !            48:        u_char  sdl_type;       /* interface type */
        !            49:        u_char  sdl_nlen;       /* interface name length, no trailing 0 reqd. */
        !            50:        u_char  sdl_alen;       /* link level address length */
        !            51:        u_char  sdl_slen;       /* link layer selector length */
        !            52:        char    sdl_data[12];   /* minimum work area, can be larger;
        !            53:                                   contains both if name and ll address */
        !            54: };
        !            55: 
        !            56: #define LLADDR(s) ((caddr_t)((s)->sdl_data + (s)->sdl_nlen))
        !            57: 

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