epan/dissectors/packet-retix-bpdu.c

   1 /* packet-retix-bpdu.c
   2  * Routines for BPDU (Retix Spanning Tree Protocol) disassembly
   3  *
   4  * Copyright 2005 Giles Scott (gscott <AT> arubanetworks dot com>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14
  15 #if 0
  16 #endif
  17 #include <epan/packet.h>
  18 #if 0
  19 #include <epan/llcsaps.h>
  20 #include <epan/ppptypes.h>
  21 #include <epan/chdlctypes.h>
  22 #endif
  23 #include <epan/addr_resolv.h>
  24
  25 void proto_register_retix_bpdu(void);
  26
  27 static int ett_retix_bpdu;
  28 static int proto_retix_bpdu;
  29
  30 static int hf_retix_bpdu_root_mac;
  31 static int hf_retix_bpdu_bridge_mac;
  32 static int hf_retix_bpdu_max_age;
  33 static int hf_retix_bpdu_hello_time;
  34 static int hf_retix_bpdu_forward_delay;
  35
  36 /* I don't have the spec's for this protcol so it's been reverse engineered
  37  * It seems quite like 802.1D
  38  * It looks like the protocol version is specified in the ethernet trailer
  39  * In the single packet I have the trailer is
  40  * "RevC CBPDU"
  41  * There are several fields I've not dissected as I'm not exactly sure what they are
  42  * What ever happened to Retix anyway?
  43 */
  44 static int
  45 dissect_retix_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  46 {
  47   proto_tree *retix_bpdu_tree;
  48   proto_tree *ti;
  49
  50   col_set_str(pinfo->cinfo, COL_PROTOCOL, "R-STP");
  51
  52   ti = proto_tree_add_item(tree, proto_retix_bpdu, tvb, 0, -1, ENC_NA);
  53   retix_bpdu_tree = proto_item_add_subtree(ti, ett_retix_bpdu);
  54
  55   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_root_mac, tvb, 0, 6, ENC_NA);
  56
  57   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_bridge_mac, tvb, 10, 6, ENC_NA);
  58   col_add_fstr(pinfo->cinfo, COL_INFO, "Bridge MAC %s", tvb_ether_to_str(pinfo->pool, tvb, 10));
  59
  60   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_max_age, tvb, 20, 2, ENC_BIG_ENDIAN);
  61   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_hello_time, tvb, 22, 2, ENC_BIG_ENDIAN);
  62   proto_tree_add_item(retix_bpdu_tree, hf_retix_bpdu_forward_delay, tvb, 24, 2, ENC_BIG_ENDIAN);
  63
  64   return tvb_captured_length(tvb);
  65 }
  66
  67
  68 void
  69 proto_register_retix_bpdu(void)
  70 {
  71   static hf_register_info hf[] = {
  72     { &hf_retix_bpdu_root_mac,
  73     { "Root MAC",  "r-stp.root.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
  74     NULL, HFILL}},
  75
  76     { &hf_retix_bpdu_bridge_mac,
  77     { "Bridge MAC", "r-stp.bridge.hw", FT_ETHER, BASE_NONE, NULL, 0x0,
  78     NULL, HFILL}},
  79
  80     { &hf_retix_bpdu_max_age,
  81     { "Max Age", "r-stp.maxage", FT_UINT16, BASE_DEC, NULL, 0x0,
  82     NULL, HFILL}},
  83
  84     { &hf_retix_bpdu_hello_time,
  85     { "Hello Time", "r-stp.hello", FT_UINT16, BASE_DEC, NULL, 0x0,
  86     NULL, HFILL}},
  87
  88     { &hf_retix_bpdu_forward_delay,
  89     { "Forward Delay", "r-stp.forward", FT_UINT16, BASE_DEC, NULL, 0x0,
  90     NULL, HFILL}},
  91   };
  92
  93   static int *ett[] ={
  94     &ett_retix_bpdu,
  95   };
  96
  97   proto_retix_bpdu = proto_register_protocol("Retix Spanning Tree Protocol", "R-STP", "r-stp");
  98   proto_register_field_array(proto_retix_bpdu, hf, array_length(hf));
  99   proto_register_subtree_array(ett, array_length(ett));
 100   register_dissector("rbpdu", dissect_retix_bpdu, proto_retix_bpdu);
 101 }
 102
 103 /*
 104  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 105  *
 106  * Local Variables:
 107  * c-basic-offset: 2
 108  * tab-width: 8
 109  * indent-tabs-mode: nil
 110  * End:
 111  *
 112  * ex: set shiftwidth=2 tabstop=8 expandtab:
 113  * :indentSize=2:tabSize=8:noTabs=true:
 114  */