/*      $OpenBSD: llc.h,v 1.8 2007/10/07 16:41:05 deraadt Exp $ */

/*
 * Copyright (c) 1993, 1994, 1997
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * @(#) $Id: llc.h,v 1.8 2007/10/07 16:41:05 deraadt Exp $ (LBL)
 */

/*
 * This stuff should come from a system header file, but there's no
 * obviously portable way to do that and it's not really going
 * to change from system to system.
 */

/*
 * A somewhat abstracted view of the LLC header
 */

struct llc {
        u_char dsap;
        u_char ssap;
        union {
                u_char u_ctl;
                u_short is_ctl;
                struct {
                        u_char snap_ui;
                        u_char snap_pi[5];
                } snap;
                struct {
                        u_char snap_ui;
                        u_char snap_orgcode[3];
                        u_char snap_ethertype[2];
                } snap_ether;
        } ctl;
};

#define llcui           ctl.snap.snap_ui
#define llcpi           ctl.snap.snap_pi
#define orgcode         ctl.snap_ether.snap_orgcode
#define ethertype       ctl.snap_ether.snap_ethertype
#define llcis           ctl.is_ctl
#define llcu            ctl.u_ctl

#define LLC_U_FMT       3
#define LLC_GSAP        1
#define LLC_S_FMT       1

#define LLC_U_POLL      0x10
#define LLC_IS_POLL     0x0001
#define LLC_XID_FI      0x81

#define LLC_U_CMD(u)    ((u) & 0xef)
#define LLC_UI          0x03
#define LLC_UA          0x63
#define LLC_DISC        0x43
#define LLC_DM          0x0f
#define LLC_SABME       0x6f
#define LLC_TEST        0xe3
#define LLC_XID         0xaf
#define LLC_FRMR        0x87

#define LLC_S_CMD(is)   (((is) >> 10) & 0x03)
#define LLC_RR          0x0100
#define LLC_RNR         0x0500
#define LLC_REJ         0x0900

#define LLC_IS_NR(is)   (((is) >> 1) & 0x7f)
#define LLC_I_NS(is)    (((is) >> 9) & 0x7f)

#ifndef LLCSAP_NULL
#define LLCSAP_NULL             0x00
#endif
#ifndef LLCSAP_GLOBAL
#define LLCSAP_GLOBAL           0xff
#endif
#ifndef LLCSAP_8021B
#define LLCSAP_8021B_I          0x02
#endif
#ifndef LLCSAP_8021B
#define LLCSAP_8021B_G          0x03
#endif
#ifndef LLCSAP_IP
#define LLCSAP_IP               0x06
#endif
#ifndef LLCSAP_PROWAYNM
#define LLCSAP_PROWAYNM         0x0e
#endif
#ifndef LLCSAP_8021D
#define LLCSAP_8021D            0x42
#endif
#ifndef LLCSAP_RS511
#define LLCSAP_RS511            0x4e
#endif
#ifndef LLCSAP_ISO8208
#define LLCSAP_ISO8208          0x7e
#endif
#ifndef LLCSAP_PROWAY
#define LLCSAP_PROWAY           0x8e
#endif
#ifndef LLCSAP_SNAP
#define LLCSAP_SNAP             0xaa
#endif
#ifndef LLCSAP_ISONS
#define LLCSAP_ISONS            0xfe
#endif