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if_llc.h revision 1.6 
      1 /*	$NetBSD: if_llc.h,v 1.6 1995/03/08 02:56:57 cgd 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 /*
     39  * IEEE 802.2 Link Level Control headers, for use in conjunction with
     40  * 802.{3,4,5} media access control methods.
     41  *
     42  * Headers here do not use bit fields due to shortcommings in many
     43  * compilers.
     44  */
     45 
     46 struct llc {
     47 	u_int8_t llc_dsap;
     48 	u_int8_t llc_ssap;
     49 	union {
     50 	    struct {
     51 		u_int8_t control;
     52 		u_int8_t format_id;
     53 		u_int8_t class;
     54 		u_int8_t window_x2;
     55 	    } type_u;
     56 	    struct {
     57 		u_int8_t num_snd_x2;
     58 		u_int8_t num_rcv_x2;
     59 	    } type_i;
     60 	    struct {
     61 		u_int8_t control;
     62 		u_int8_t num_rcv_x2;
     63 	    } type_s;
     64 	    struct {
     65 	        u_int8_t control;
     66 		struct frmrinfo {
     67 			u_int8_t rej_pdu_0;
     68 			u_int8_t rej_pdu_1;
     69 			u_int8_t frmr_control;
     70 			u_int8_t frmr_control_ext;
     71 			u_int8_t frmr_cause;
     72 		} frmrinfo;
     73 	    } type_frmr;
     74 	    struct {
     75 		u_int8_t  control;
     76 		u_int8_t  org_code[3];
     77 		u_int16_t ether_type;
     78 	    } type_snap;
     79 	    struct {
     80 		u_int8_t control;
     81 		u_int8_t control_ext;
     82 	    } type_raw;
     83 	} llc_un;
     84 };
     85 #define llc_control            llc_un.type_u.control
     86 #define	llc_control_ext        llc_un.type_raw.control_ext
     87 #define llc_fid                llc_un.type_u.format_id
     88 #define llc_class              llc_un.type_u.class
     89 #define llc_window             llc_un.type_u.window_x2
     90 #define llc_frmrinfo           llc_un.type_frmr.frmrinfo
     91 #define llc_frmr_pdu0          llc_un.type_frmr.frmrinfo.rej_pdu0
     92 #define llc_frmr_pdu1          llc_un.type_frmr.frmrinfo.rej_pdu1
     93 #define llc_frmr_control       llc_un.type_frmr.frmrinfo.frmr_control
     94 #define llc_frmr_control_ext   llc_un.type_frmr.frmrinfo.frmr_control_ext
     95 #define llc_frmr_cause         llc_un.type_frmr.frmrinfo.frmr_control_ext
     96 
     97 /*
     98  * Don't use sizeof(struct llc_un) for LLC header sizes
     99  */
    100 #define LLC_ISFRAMELEN 4
    101 #define LLC_UFRAMELEN  3
    102 #define LLC_FRMRLEN    7
    103 
    104 /*
    105  * Unnumbered LLC format commands
    106  */
    107 #define LLC_UI		0x3
    108 #define LLC_UI_P	0x13
    109 #define LLC_DISC	0x43
    110 #define	LLC_DISC_P	0x53
    111 #define LLC_UA		0x63
    112 #define LLC_UA_P	0x73
    113 #define LLC_TEST	0xe3
    114 #define LLC_TEST_P	0xf3
    115 #define LLC_FRMR	0x87
    116 #define	LLC_FRMR_P	0x97
    117 #define LLC_DM		0x0f
    118 #define	LLC_DM_P	0x1f
    119 #define LLC_XID		0xaf
    120 #define LLC_XID_P	0xbf
    121 #define LLC_SABME	0x6f
    122 #define LLC_SABME_P	0x7f
    123 
    124 /*
    125  * Supervisory LLC commands
    126  */
    127 #define	LLC_RR		0x01
    128 #define	LLC_RNR		0x05
    129 #define	LLC_REJ		0x09
    130 
    131 /*
    132  * Info format - dummy only
    133  */
    134 #define	LLC_INFO	0x00
    135 
    136 /*
    137  * ISO PDTR 10178 contains among others
    138  */
    139 #define LLC_X25_LSAP	0x7e
    140 #define LLC_SNAP_LSAP	0xaa
    141 #define LLC_ISO_LSAP	0xfe
    142