llc.h

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Copyright (c) 1993, 1994, 1997
 *      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: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * @(#) $Header: /tcpdump/master/tcpdump/llc.h,v 1.6.1.1 1999/10/07 23:47:10 mcr Exp $ (LBL)
 */

/*
 * This stuff should come from a system header file, but there's no
 * obviously portable way to do that and it's not really going
 * to change from system to system.
 */

/*
 * A somewhat abstracted view of the LLC header
 */

struct llc {
       u_char dsap;
       u_char ssap;
       union {
         u_char  u_ctl;
         u_short is_ctl;
         struct {
           u_char snap_ui;
           u_char snap_pi[5];
         } snap;
         struct {
           u_char snap_ui;
           u_char snap_orgcode[3];
           u_char snap_ethertype[2];
         } snap_ether;
       } ctl;
     };

#define llcui           ctl.snap.snap_ui
#define llcpi           ctl.snap.snap_pi
#define orgcode         ctl.snap_ether.snap_orgcode
#define ethertype       ctl.snap_ether.snap_ethertype
#define llcis           ctl.is_ctl
#define llcu            ctl.u_ctl

#define LLC_U_FMT       3
#define LLC_GSAP        1
#define LLC_S_FMT       1

#define LLC_U_POLL      0x10
#define LLC_IS_POLL     0x0001
#define LLC_XID_FI      0x81

#define LLC_U_CMD(u)    ((u) & 0xef)
#define LLC_UI          0x03
#define LLC_UA          0x63
#define LLC_DISC        0x43
#define LLC_DM          0x0f
#define LLC_SABME       0x6f
#define LLC_TEST        0xe3
#define LLC_XID         0xaf
#define LLC_FRMR        0x87

#define LLC_S_CMD(is)   (((is) >> 10) & 0x03)
#define LLC_RR          0x0100
#define LLC_RNR         0x0500
#define LLC_REJ         0x0900

#define LLC_IS_NR(is)   (((is) >> 1) & 0x7f)
#define LLC_I_NS(is)    (((is) >> 9) & 0x7f)

#ifndef LLCSAP_NULL
#define LLCSAP_NULL     0x00
#endif

#ifndef LLCSAP_GLOBAL
#define LLCSAP_GLOBAL   0xff
#endif

#ifndef LLCSAP_8021B
#define LLCSAP_8021B_I  0x02
#endif

#ifndef LLCSAP_8021B
#define LLCSAP_8021B_G  0x03
#endif

#ifndef LLCSAP_IP
#define LLCSAP_IP       0x06
#endif

#ifndef LLCSAP_PROWAYNM
#define LLCSAP_PROWAYNM 0x0e
#endif

#ifndef LLCSAP_8021D
#define LLCSAP_8021D    0x42
#endif

#ifndef LLCSAP_RS511
#define LLCSAP_RS511    0x4e
#endif

#ifndef LLCSAP_ISO8208
#define LLCSAP_ISO8208  0x7e
#endif

#ifndef LLCSAP_PROWAY
#define LLCSAP_PROWAY   0x8e
#endif

#ifndef LLCSAP_SNAP
#define LLCSAP_SNAP     0xaa
#endif

#ifndef LLCSAP_ISONS
#define LLCSAP_ISONS    0xfe
#endif