if_llc.h

Go to the documentation of this file.

/*  $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.
 * 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
 * $FreeBSD$
 */

#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;
        uint8_t window_x2;
        } __packed type_u;
        struct {
        uint8_t num_snd_x2;
        uint8_t num_rcv_x2;
        } __packed type_i;
        struct {
        uint8_t control;
        uint8_t num_rcv_x2;
        } __packed type_s;
        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;
        } __packed type_frmr;
        struct {
        uint8_t  control;
        uint8_t  org_code[3];
        uint16_t ether_type;
        } __packed type_snap;
        struct {
        uint8_t control;
        uint8_t control_ext;
        } __packed type_raw;
    } __packed llc_un;
} __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;
} __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

#ifdef CTASSERT
CTASSERT(sizeof (struct llc) == LLC_SNAPFRAMELEN);
#endif

/*
 * 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

#define RFC1042_LEN     6
#define RFC1042         {0xAA, 0xAA, 0x03, 0x00, 0x00, 0x00}
#define ETHERNET_TUNNEL {0xAA, 0xAA, 0x03, 0x00, 0x00, 0xF8}

/*
 *   copied from sys/net/ethernet.h
 */
#define ETHERTYPE_AARP          0x80F3  /* AppleTalk AARP */
#define ETHERTYPE_IPX           0x8137  /* Novell (old) NetWare IPX (ECONFIG E option) */



#endif /* _NET_IF_LLC_H_ */