/*      $OpenBSD: if_llc.h,v 1.8 2013/01/17 00:48:04 henning Exp $      */
/*      $NetBSD: if_llc.h,v 1.6 1995/03/08 02:56:57 cgd Exp $   */

/*
 * Copyright (c) 1988, 1993
 *      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 the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)if_llc.h    8.1 (Berkeley) 6/10/93
 */

#ifndef _NET_IF_LLC_H_
#define _NET_IF_LLC_H_

/*
 * 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 shortcomings in many
 * compilers.
 */

struct llc {
        u_int8_t llc_dsap;
        u_int8_t llc_ssap;
        union {
            struct {
                u_int8_t control;
                u_int8_t format_id;
                u_int8_t class;
                u_int8_t window_x2;
            } type_u;
            struct {
                u_int8_t num_snd_x2;
                u_int8_t num_rcv_x2;
            } type_i;
            struct {
                u_int8_t control;
                u_int8_t num_rcv_x2;
            } type_s;
            struct {
                u_int8_t control;
                struct frmrinfo {
                        u_int8_t rej_pdu_0;
                        u_int8_t rej_pdu_1;
                        u_int8_t frmr_control;
                        u_int8_t frmr_control_ext;
                        u_int8_t frmr_cause;
                } frmrinfo;
            } type_frmr;
            struct {
                u_int8_t control;
                u_int8_t org_code[3];
                u_int16_t ether_type;
            } type_snap;
            struct {
                u_int8_t control;
                u_int8_t control_ext;
            } type_raw;
        } llc_un;
};
#define llc_control             llc_un.type_u.control
#define llc_control_ext         llc_un.type_raw.control_ext
#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_frmrinfo            llc_un.type_frmr.frmrinfo
#define llc_frmr_pdu0           llc_un.type_frmr.frmrinfo.rej_pdu0
#define llc_frmr_pdu1           llc_un.type_frmr.frmrinfo.rej_pdu1
#define llc_frmr_control        llc_un.type_frmr.frmrinfo.frmr_control
#define llc_frmr_control_ext    llc_un.type_frmr.frmrinfo.frmr_control_ext
#define llc_frmr_cause          llc_un.type_frmr.frmrinfo.frmr_control_ext
#define llc_snap                llc_un.type_snap

/*
 * Don't use sizeof(struct llc_un) for LLC header sizes
 */
#define LLC_UFRAMELEN           3
#define LLC_ISFRAMELEN          4
#define LLC_FRMRLEN             7
#define LLC_SNAPFRAMELEN        8

/*
 * Unnumbered LLC format commands
 */
#define LLC_UI          0x3
#define LLC_UI_P        0x13
#define LLC_DISC        0x43
#define LLC_DISC_P      0x53
#define LLC_UA          0x63
#define LLC_UA_P        0x73
#define LLC_TEST        0xe3
#define LLC_TEST_P      0xf3
#define LLC_FRMR        0x87
#define LLC_FRMR_P      0x97
#define LLC_DM          0x0f
#define LLC_DM_P        0x1f
#define LLC_XID         0xaf
#define LLC_XID_P       0xbf
#define LLC_SABME       0x6f
#define LLC_SABME_P     0x7f

/*
 * Supervisory LLC commands
 */
#define LLC_RR          0x01
#define LLC_RNR         0x05
#define LLC_REJ         0x09

/*
 * Info format - dummy only
 */
#define LLC_INFO        0x00

/*
 * ISO PDTR 10178 contains among others
 */
#define LLC_8021D_LSAP  0x42
#define LLC_X25_LSAP    0x7e
#define LLC_SNAP_LSAP   0xaa
#define LLC_ISO_LSAP    0xfe
#endif /* _NET_IF_LLC_H_ */