if_llc.h 4.49 KiB
/* $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 {
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;
} __packed type_u;
struct {
u_int8_t num_snd_x2;
u_int8_t num_rcv_x2;
} __packed type_i;
struct {
u_int8_t control;
u_int8_t num_rcv_x2;
} __packed type_s;
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;
} __packed type_frmr;
struct {
u_int8_t control;
u_int8_t org_code[3];
u_int16_t ether_type;
} __packed type_snap;
struct {
u_int8_t control;
u_int8_t control_ext;
} __packed type_raw;
} __packed llc_un;
} __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;
} __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
#endif /* _NET_IF_LLC_H_ */