/*      $NetBSD: if_llc.h,v 1.23 2021/02/03 18:13:13 roy 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 shortcommings in many
* compilers.
*/

struct llc {
       uint8_t llc_dsap;
       uint8_t llc_ssap;
       union {
           struct {
               uint8_t control;
               uint8_t format_id;
               uint8_t class_u;
               uint8_t window_x2;
           } type_u /* XXX __packed ??? */;
           struct {
               uint8_t num_snd_x2;
               uint8_t num_rcv_x2;
           } type_i /* XXX __packed ??? */;
           struct {
               uint8_t control;
               uint8_t num_rcv_x2;
           } type_s /* XXX __packed ??? */;
           struct {
               uint8_t control;
               /*
                * We cannot put the following fields in a structure because
                * the structure rounding might cause padding.
                */
               uint8_t frmr_rej_pdu0;
               uint8_t frmr_rej_pdu1;
               uint8_t frmr_control;
               uint8_t frmr_control_ext;
               uint8_t frmr_cause;
           } type_frmr /* XXX __packed ??? */;
           struct {
               uint8_t  control;
               uint8_t  org_code[3];
               uint16_t ether_type;
           } type_snap __packed;
           struct {
               uint8_t control;
               uint8_t control_ext;
           } type_raw /* XXX __packed ??? */;
       } llc_un /* XXX __packed ??? */;
};

struct frmrinfo {
       uint8_t frmr_rej_pdu0;
       uint8_t frmr_rej_pdu1;
       uint8_t frmr_control;
       uint8_t frmr_control_ext;
       uint8_t frmr_cause;
};

#ifdef __CTASSERT
__CTASSERT(sizeof(struct llc) == 8);
__CTASSERT(sizeof(struct frmrinfo) == 5);
#endif

#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_u
#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_8021D_LSAP  0x42
#define LLC_X25_LSAP    0x7e
#define LLC_SNAP_LSAP   0xaa
#define LLC_ISO_LSAP    0xfe

/*
* LLC XID definitions from 802.2, as needed
*/

#define LLC_XID_FORMAT_BASIC    0x81
#define LLC_XID_BASIC_MINLEN    (LLC_UFRAMELEN + 3)

#define LLC_XID_CLASS_I         0x1
#define LLC_XID_CLASS_II        0x3
#define LLC_XID_CLASS_III       0x5
#define LLC_XID_CLASS_IV        0x7


#endif /* !_NET_IF_LLC_H_ */

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.