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/*      $NetBSD: if_llc.h,v 1.12 1999/11/19 20:41:19 thorpej 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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. 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

 * $FreeBSD: src/sys/net/if_llc.h,v 1.8 2002/03/29 06:58:45 mdodd Exp $

 */

#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 shortcommings 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 __attribute__((__packed__));

            struct {

                u_int8_t num_snd_x2;

                u_int8_t num_rcv_x2;

            } type_i __attribute__((__packed__));

            struct {

                u_int8_t control;

                u_int8_t num_rcv_x2;

            } type_s __attribute__((__packed__));

            struct {

                u_int8_t control;

                /*

                 * We cannot put the following fields in a structure because

                 * the structure rounding might cause padding.

                 */

                u_int8_t frmr_rej_pdu0;

                u_int8_t frmr_rej_pdu1;

                u_int8_t frmr_control;

                u_int8_t frmr_control_ext;

                u_int8_t frmr_cause;

            } type_frmr __attribute__((__packed__));

            struct {

                u_int8_t  control;

                u_int8_t  org_code[3];

                u_int16_t ether_type;

            } type_snap __attribute__((__packed__));

            struct {

                u_int8_t control;

                u_int8_t control_ext;

            } type_raw __attribute__((__packed__));

        } llc_un /* XXX __attribute__((__packed__)) ??? */;

} __attribute__((__packed__));

struct frmrinfo {

        u_int8_t frmr_rej_pdu0;

        u_int8_t frmr_rej_pdu1;

        u_int8_t frmr_control;

        u_int8_t frmr_control_ext;

        u_int8_t frmr_cause;

} __attribute__((__packed__));

#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.frmr_rej_pdu0

#define llc_frmr_pdu0           llc_un.type_frmr.frmr_rej_pdu0

#define llc_frmr_pdu1           llc_un.type_frmr.frmr_rej_pdu1

#define llc_frmr_control        llc_un.type_frmr.frmr_control

#define llc_frmr_control_ext    llc_un.type_frmr.frmr_control_ext

#define llc_frmr_cause          llc_un.type_frmr.frmr_cause

#define llc_snap                llc_un.type_snap

/*

 * Don't use sizeof(struct llc_un) for LLC header sizes

 */

#define LLC_ISFRAMELEN 4

#define LLC_UFRAMELEN  3

#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_X25_LSAP    0x7e

#define LLC_SNAP_LSAP   0xaa

#define LLC_ISO_LSAP    0xfe

#endif /* _NET_IF_LLC_H_ */