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Annotation of 43BSDReno/sys/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 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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