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if_llc.h revision 1.10 
      1 /*	$NetBSD: if_llc.h,v 1.10 1998/02/09 17:43:50 perry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)if_llc.h	8.1 (Berkeley) 6/10/93
     36  */
     37 
     38 #ifndef _NET_IF_LLC_H_
     39 #define _NET_IF_LLC_H_
     40 
     41 /*
     42  * IEEE 802.2 Link Level Control headers, for use in conjunction with
     43  * 802.{3,4,5} media access control methods.
     44  *
     45  * Headers here do not use bit fields due to shortcommings in many
     46  * compilers.
     47  */
     48 
     49 struct llc {
     50 	u_int8_t llc_dsap;
     51 	u_int8_t llc_ssap;
     52 	union {
     53 	    struct {
     54 		u_int8_t control;
     55 		u_int8_t format_id;
     56 		u_int8_t class;
     57 		u_int8_t window_x2;
     58 	    } type_u;
     59 	    struct {
     60 		u_int8_t num_snd_x2;
     61 		u_int8_t num_rcv_x2;
     62 	    } type_i;
     63 	    struct {
     64 		u_int8_t control;
     65 		u_int8_t num_rcv_x2;
     66 	    } type_s;
     67 	    struct {
     68 	        u_int8_t control;
     69 		/*
     70 		 * We cannot put the following fields in a structure because
     71 		 * the structure rounding might cause padding.
     72 		 */
     73 		u_int8_t frmr_rej_pdu0;
     74 		u_int8_t frmr_rej_pdu1;
     75 		u_int8_t frmr_control;
     76 		u_int8_t frmr_control_ext;
     77 		u_int8_t frmr_cause;
     78 	    } type_frmr;
     79 	    struct {
     80 		u_int8_t  control;
     81 		u_int8_t  org_code[3];
     82 		u_int16_t ether_type;
     83 	    } type_snap;
     84 	    struct {
     85 		u_int8_t control;
     86 		u_int8_t control_ext;
     87 	    } type_raw;
     88 	} llc_un;
     89 };
     90 
     91 struct frmrinfo {
     92 	u_int8_t frmr_rej_pdu0;
     93 	u_int8_t frmr_rej_pdu1;
     94 	u_int8_t frmr_control;
     95 	u_int8_t frmr_control_ext;
     96 	u_int8_t frmr_cause;
     97 };
     98 
     99 #define	llc_control		llc_un.type_u.control
    100 #define	llc_control_ext		llc_un.type_raw.control_ext
    101 #define	llc_fid			llc_un.type_u.format_id
    102 #define	llc_class		llc_un.type_u.class
    103 #define	llc_window		llc_un.type_u.window_x2
    104 #define	llc_frmrinfo 		llc_un.type_frmr.frmr_rej_pdu0
    105 #define	llc_frmr_pdu0		llc_un.type_frmr.frmr_rej_pdu0
    106 #define	llc_frmr_pdu1		llc_un.type_frmr.frmr_rej_pdu1
    107 #define	llc_frmr_control	llc_un.type_frmr.frmr_control
    108 #define	llc_frmr_control_ext	llc_un.type_frmr.frmr_control_ext
    109 #define	llc_frmr_cause		llc_un.type_frmr.frmr_cause
    110 
    111 /*
    112  * Don't use sizeof(struct llc_un) for LLC header sizes
    113  */
    114 #define LLC_ISFRAMELEN 4
    115 #define LLC_UFRAMELEN  3
    116 #define LLC_FRMRLEN    7
    117 
    118 /*
    119  * Unnumbered LLC format commands
    120  */
    121 #define LLC_UI		0x3
    122 #define LLC_UI_P	0x13
    123 #define LLC_DISC	0x43
    124 #define	LLC_DISC_P	0x53
    125 #define LLC_UA		0x63
    126 #define LLC_UA_P	0x73
    127 #define LLC_TEST	0xe3
    128 #define LLC_TEST_P	0xf3
    129 #define LLC_FRMR	0x87
    130 #define	LLC_FRMR_P	0x97
    131 #define LLC_DM		0x0f
    132 #define	LLC_DM_P	0x1f
    133 #define LLC_XID		0xaf
    134 #define LLC_XID_P	0xbf
    135 #define LLC_SABME	0x6f
    136 #define LLC_SABME_P	0x7f
    137 
    138 /*
    139  * Supervisory LLC commands
    140  */
    141 #define	LLC_RR		0x01
    142 #define	LLC_RNR		0x05
    143 #define	LLC_REJ		0x09
    144 
    145 /*
    146  * Info format - dummy only
    147  */
    148 #define	LLC_INFO	0x00
    149 
    150 /*
    151  * ISO PDTR 10178 contains among others
    152  */
    153 #define LLC_X25_LSAP	0x7e
    154 #define LLC_SNAP_LSAP	0xaa
    155 #define LLC_ISO_LSAP	0xfe
    156 
    157 #endif /* _NET_IF_LLC_H_ */
    158