Home | History | Annotate | Line # | Download | only in net
if_llc.h revision 1.1.1.2 
      1 /*
      2  * Copyright (c) 1988, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *      @(#)if_llc.h	8.1 (Berkeley) 6/10/93
     34  */
     35 
     36 /*
     37  * IEEE 802.2 Link Level Control headers, for use in conjunction with
     38  * 802.{3,4,5} media access control methods.
     39  *
     40  * Headers here do not use bit fields due to shortcommings in many
     41  * compilers.
     42  */
     43 
     44 struct llc {
     45 	u_char	llc_dsap;
     46 	u_char	llc_ssap;
     47 	union {
     48 	    struct {
     49 		u_char control;
     50 		u_char format_id;
     51 		u_char class;
     52 		u_char window_x2;
     53 	    } type_u;
     54 	    struct {
     55 		u_char num_snd_x2;
     56 		u_char num_rcv_x2;
     57 	    } type_i;
     58 	    struct {
     59 		u_char control;
     60 		u_char num_rcv_x2;
     61 	    } type_s;
     62 	    struct {
     63 	        u_char control;
     64 		struct frmrinfo {
     65 			u_char rej_pdu_0;
     66 			u_char rej_pdu_1;
     67 			u_char frmr_control;
     68 			u_char frmr_control_ext;
     69 			u_char frmr_cause;
     70 		} frmrinfo;
     71 	    } type_frmr;
     72 	    struct {
     73 		u_char control;
     74 		u_char org_code[3];
     75 		u_short ether_type;
     76 	    } type_snap;
     77 	    struct {
     78 		u_char control;
     79 		u_char control_ext;
     80 	    } type_raw;
     81 	} llc_un;
     82 };
     83 #define llc_control            llc_un.type_u.control
     84 #define	llc_control_ext        llc_un.type_raw.control_ext
     85 #define llc_fid                llc_un.type_u.format_id
     86 #define llc_class              llc_un.type_u.class
     87 #define llc_window             llc_un.type_u.window_x2
     88 #define llc_frmrinfo           llc_un.type_frmr.frmrinfo
     89 #define llc_frmr_pdu0          llc_un.type_frmr.frmrinfo.rej_pdu0
     90 #define llc_frmr_pdu1          llc_un.type_frmr.frmrinfo.rej_pdu1
     91 #define llc_frmr_control       llc_un.type_frmr.frmrinfo.frmr_control
     92 #define llc_frmr_control_ext   llc_un.type_frmr.frmrinfo.frmr_control_ext
     93 #define llc_frmr_cause         llc_un.type_frmr.frmrinfo.frmr_control_ext
     94 
     95 /*
     96  * Don't use sizeof(struct llc_un) for LLC header sizes
     97  */
     98 #define LLC_ISFRAMELEN 4
     99 #define LLC_UFRAMELEN  3
    100 #define LLC_FRMRLEN    7
    101 
    102 /*
    103  * Unnumbered LLC format commands
    104  */
    105 #define LLC_UI		0x3
    106 #define LLC_UI_P	0x13
    107 #define LLC_DISC	0x43
    108 #define	LLC_DISC_P	0x53
    109 #define LLC_UA		0x63
    110 #define LLC_UA_P	0x73
    111 #define LLC_TEST	0xe3
    112 #define LLC_TEST_P	0xf3
    113 #define LLC_FRMR	0x87
    114 #define	LLC_FRMR_P	0x97
    115 #define LLC_DM		0x0f
    116 #define	LLC_DM_P	0x1f
    117 #define LLC_XID		0xaf
    118 #define LLC_XID_P	0xbf
    119 #define LLC_SABME	0x6f
    120 #define LLC_SABME_P	0x7f
    121 
    122 /*
    123  * Supervisory LLC commands
    124  */
    125 #define	LLC_RR		0x01
    126 #define	LLC_RNR		0x05
    127 #define	LLC_REJ		0x09
    128 
    129 /*
    130  * Info format - dummy only
    131  */
    132 #define	LLC_INFO	0x00
    133 
    134 /*
    135  * ISO PDTR 10178 contains among others
    136  */
    137 #define LLC_X25_LSAP	0x7e
    138 #define LLC_SNAP_LSAP	0xaa
    139 #define LLC_ISO_LSAP	0xfe
    140 
    141 
    142 
    143 
    144 
    145 
    146