epan/dissectors/packet-retix-bpdu.c

   1 /* packet-retix-bpdu.c
   2  * Routines for BPDU (Retix Spanning Tree Protocol) disassembly
   3  *
   4  * $Id$
   5  *
   6  * Copyright 2005 Giles Scott (gscott <AT> arubanetworks dot com>
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "config.h"
  28
  29 #if 0
  30 #endif
  31 #include <glib.h>
  32 #include <epan/packet.h>
  33 #if 0
  34 #include <epan/llcsaps.h>
  35 #include <epan/ppptypes.h>
  36 #include <epan/chdlctypes.h>
  37 #endif
  38 #include <epan/addr_resolv.h>
  39
  40 static gint ett_retix_bpdu = -1;
  41 static int proto_retix_bpdu = -1;
  42
  43 static int hf_retix_bpdu_root_mac = -1;
  44 static int hf_retix_bpdu_bridge_mac = -1;
  45 static int hf_retix_bpdu_max_age = -1;
  46 static int hf_retix_bpdu_hello_time = -1;
  47 static int hf_retix_bpdu_forward_delay = -1;
  48
  49 /* I don't have the spec's for this protcol so it's been reverse engineered
  50  * It seems quite like 802.1D
  51  * It looks like the protocol version is specified in the ethernet trailer
  52  * In the single packet I have the trailer is
  53  * "RevC CBPDU"
  54  * There are several fields I've not dissected as I'm not exactly sure what they are
  55  * What ever happened to Retix anyway?
  56 */
  57 static void
  58 dissect_retix_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  59 {
  60   proto_tree *retix_bpdu_tree;
  61   proto_tree *ti;
  62
  63   col_set_str(pinfo->cinfo, COL_PROTOCOL, "R-STP");
  64   col_add_fstr(pinfo->cinfo, COL_INFO, "Bridge MAC %s", tvb_ether_to_str(tvb, 10));
  65
  66   retix_bpdu_tree = NULL;
  67
  68   if (tree) {
  69     ti = proto_tree_add_item(tree, proto_retix_bpdu, tvb, 0, -1, ENC_NA);
  70     retix_bpdu_tree = proto_item_add_subtree(ti, ett_retix_bpdu);
  71   }
  72
  73   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_root_mac, tvb, 0, 6, ENC_NA);
  74
  75   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_bridge_mac, tvb, 10, 6, ENC_NA);
  76
  77   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_max_age, tvb, 20, 2, ENC_BIG_ENDIAN);
  78   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_hello_time, tvb, 22, 2, ENC_BIG_ENDIAN);
  79   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_forward_delay, tvb, 24, 2, ENC_BIG_ENDIAN);
  80
  81 }
  82
  83
  84 void
  85 proto_register_retix_bpdu(void)
  86 {
  87   static hf_register_info hf[] = {
  88     { &hf_retix_bpdu_root_mac,
  89     { "Root MAC",  "r-stp.root.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
  90     NULL, HFILL}},
  91
  92     { &hf_retix_bpdu_bridge_mac,
  93     { "Bridge MAC", "r-stp.bridge.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
  94     NULL, HFILL}},
  95
  96     { &hf_retix_bpdu_max_age,
  97     { "Max Age", "r-stp.maxage", FT_UINT16, BASE_DEC, NULL, 0x0,
  98     NULL, HFILL}},
  99
 100     { &hf_retix_bpdu_hello_time,
 101     { "Hello Time", "r-stp.hello", FT_UINT16, BASE_DEC, NULL, 0x0,
 102     NULL, HFILL}},
 103
 104     { &hf_retix_bpdu_forward_delay,
 105     { "Forward Delay", "r-stp.forward", FT_UINT16, BASE_DEC, NULL, 0x0,
 106     NULL, HFILL}},
 107   };
 108
 109   static gint *ett[] ={
 110     &ett_retix_bpdu,
 111   };
 112
 113   proto_retix_bpdu = proto_register_protocol("Retix Spanning Tree Protocol", "R-STP", "r-stp");
 114   proto_register_field_array(proto_retix_bpdu, hf, array_length(hf));
 115   proto_register_subtree_array(ett, array_length(ett));
 116   register_dissector("rbpdu", dissect_retix_bpdu, proto_retix_bpdu);
 117 }
 118
 119 void
 120 proto_reg_handoff_retix_bpdu(void)
 121 {
 122 }