if_llc.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/* static     char    *sccsid = "@(#)if_llc.h	4.1	(ULTRIX)	7/2/90"; */

/************************************************************************
 *									*
 *		      Copyright (c) 1985, 1989 by			*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

 /*
  * Copyright (c) 1988 Regents of the University of California.
  * All rights reserved.
  *
  *      @(#)if_llc.h	7.1 (Berkeley) 9/4/89
  */

/*
 * IEEE 802.2 Link Level Control headers, for use in conjunction with
 * 802.{3,4,5} media access control methods.
 *
 * Headers here do not use bit fields due to shortcommings in many
 * compilers.
 */

struct llc {
	u_char	llc_dsap;
	u_char	llc_ssap;
	union {
	    struct {
		u_char control;
		u_char format_id;
		u_char class;
		u_char window_x2;
	    } type_u;
	    struct {
		u_char num_snd_x2;
		u_char num_rcv_x2;
	    } type_i;
	    struct {
		u_char control;
		u_char num_rcv_x2;
	    } type_s;
	    struct {
		u_char control;
		u_char org_code[3];
		u_short ether_type;
	    } type_snap;
	} llc_un;
};
#define llc_control llc_un.type_u.control
#define llc_fid llc_un.type_u.format_id
#define llc_class llc_un.type_u.class
#define llc_window llc_un.type_u.window_x2
#define	llc_org_code llc_un.type_snap.org_code
#define	llc_ether_type llc_un.type_snap.ether_type

#define LLC_UI		0x3
#define LLC_UI_P	0x13
#define LLC_XID		0xaf
#define LLC_XID_P	0xbf
#define LLC_TEST	0xe3
#define LLC_TEST_P	0xf3

#define LLC_ISO_LSAP	0xfe
#define LLC_SNAP_LSAP	0xaa