epan/dissectors/packet-vmlab.c

   1 /* packet-vmlab.c
   2  * Routines for VMware Lab Manager Frame Dis-assembly
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25
  26 /* History
  27  *
  28  * Apr 4, 2010 - David Aggeler
  29  *
  30  * - Initial version based on packet-vlan.c
  31  *
  32  *   VMware Lab Manager is using this encapsulation directly as Ethernet Frames
  33  *   or inside VLANs. The Ethernet type was originally registered to Akimbi, but VMware
  34  *   acquired this company in 2006. No public information found, so the decoding here
  35  *   is an educated guess. Since one of the features of Lab Manager is to separate
  36  *   VMs with equal host name, IP and MAC Address, I expect the upper layer dissectors
  37  *   (namely ARP, ICMP, IP, TCP) to create false alerts, since identical configurations
  38  *   may communicate at the same time. The main goal of this dissector is to be able
  39  *   to troubleshoot connectivity, preferably pings. It's also a little to understand
  40  *   as to how host spanning fenced configurations actually talk.
  41  *
  42  */
  43
  44 #include "config.h"
  45
  46 #include <glib.h>
  47 #include <epan/addr_resolv.h>
  48 #include <epan/packet.h>
  49 #include <epan/etypes.h>
  50
  51 static int proto_vmlab = -1;
  52
  53 static int hf_vmlab_flags_part1 = -1;           /* Unknown so far */
  54 static int hf_vmlab_flags_fragment = -1;
  55 static int hf_vmlab_flags_part2 = -1;           /* Unknown so far */
  56
  57 static int hf_vmlab_portgroup = -1;
  58 static int hf_vmlab_eth_src = -1;
  59 static int hf_vmlab_eth_dst = -1;
  60 static int hf_vmlab_eth_addr = -1;
  61 static int hf_vmlab_etype = -1;
  62 static int hf_vmlab_trailer = -1;
  63
  64 static gint ett_vmlab = -1;
  65
  66 static const value_string fragment_vals[] = {
  67     { 0, "Not set" },
  68     { 1, "Set" },
  69     { 0, NULL }
  70 };
  71
  72 static void
  73 dissect_vmlab(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  74 {
  75
  76     proto_tree*     volatile vmlab_tree;
  77     proto_item*     ti;
  78
  79     guint32         offset=0;
  80
  81     const guint8*   src_addr;
  82     const guint8*   dst_addr;
  83     guint8          attributes;
  84     guint8          portgroup;
  85
  86     volatile guint16 encap_proto;
  87
  88     col_set_str(pinfo->cinfo, COL_PROTOCOL, "VMLAB");
  89     col_clear(pinfo->cinfo, COL_INFO);
  90
  91     ti = proto_tree_add_item(tree, proto_vmlab, tvb, 0, 24, ENC_NA);
  92     vmlab_tree = proto_item_add_subtree(ti, ett_vmlab);
  93
  94     /* Flags*/
  95     attributes = tvb_get_guint8(tvb, offset);
  96     proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part1,    tvb, offset, 1, ENC_BIG_ENDIAN);
  97     proto_tree_add_item(vmlab_tree, hf_vmlab_flags_fragment, tvb, offset, 1, ENC_BIG_ENDIAN);
  98     proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part2,    tvb, offset, 1, ENC_BIG_ENDIAN);
  99     if (attributes & 0x04) {
 100         proto_item_append_text(ti, ", Fragment");
 101     }
 102     offset += 1;
 103
 104     /* Portgroup*/
 105     portgroup = tvb_get_guint8(tvb, offset);
 106     proto_tree_add_uint(vmlab_tree, hf_vmlab_portgroup, tvb, offset, 1, portgroup);
 107     proto_item_append_text(ti, ", Portgroup: %d", portgroup);
 108     offset += 1;
 109
 110     /* The next two bytes were always 0x0000 as far as I could tell*/
 111     offset += 2;
 112
 113     /* Not really clear, what the difference between this and the next MAC address is
 114        Both are usually equal*/
 115     proto_tree_add_item(vmlab_tree, hf_vmlab_eth_addr, tvb, offset, 6, ENC_NA);
 116     offset += 6;
 117
 118     dst_addr=tvb_get_ptr(tvb, offset, 6);
 119     proto_tree_add_item(vmlab_tree, hf_vmlab_eth_dst, tvb, offset, 6, ENC_NA);
 120     offset += 6;
 121
 122     /* Source MAC*/
 123     src_addr=tvb_get_ptr(tvb, offset, 6);
 124     proto_tree_add_item(vmlab_tree, hf_vmlab_eth_src, tvb, offset, 6, ENC_NA);
 125     offset += 6;
 126
 127     proto_item_append_text(ti, ", Src: %s (%s), Dst: %s (%s)",
 128                            get_ether_name(src_addr), ether_to_str(src_addr), get_ether_name(dst_addr), ether_to_str(dst_addr));
 129
 130     /* Encapsulated Ethertype is also part of the block*/
 131     encap_proto = tvb_get_ntohs(tvb, offset);
 132     offset += 2;
 133
 134     /* Now call whatever was encapsulated*/
 135     ethertype(encap_proto, tvb, offset, pinfo, tree, vmlab_tree, hf_vmlab_etype, hf_vmlab_trailer, 0);
 136
 137 }
 138
 139 void
 140 proto_register_vmlab(void)
 141 {
 142     static hf_register_info hf[] = {
 143
 144         { &hf_vmlab_flags_part1,    { "Unknown", "vmlab.unknown1",
 145             FT_UINT8, BASE_HEX,  NULL, 0xF8, NULL, HFILL }},
 146         { &hf_vmlab_flags_fragment, { "More Fragments", "vmlab.fragment",
 147             FT_UINT8, BASE_DEC, VALS(fragment_vals), 0x04, NULL, HFILL }},
 148         { &hf_vmlab_flags_part2,    { "Unknown", "vmlab.unknown2",
 149             FT_UINT8, BASE_HEX,  NULL, 0x03, NULL, HFILL }},
 150
 151         { &hf_vmlab_portgroup,      { "Portgroup", "vmlab.pgrp",
 152             FT_UINT8, BASE_DEC,  NULL, 0, NULL, HFILL }},
 153         { &hf_vmlab_eth_src,        { "Source", "vmlab.src",
 154             FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
 155         { &hf_vmlab_eth_dst,        { "Destination", "vmlab.dst",
 156             FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
 157         { &hf_vmlab_eth_addr,       { "Address", "vmlab.addr",
 158             FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }},
 159         { &hf_vmlab_etype,          { "Encapsulated Type", "vmlab.subtype",
 160             FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }},
 161         { &hf_vmlab_trailer,        { "Trailer", "vmlab.trailer",
 162             FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }}
 163     };
 164     static gint *ett[] = {
 165         &ett_vmlab
 166     };
 167
 168     proto_vmlab = proto_register_protocol("VMware Lab Manager", "VMLAB", "vmlab");
 169     proto_register_field_array(proto_vmlab, hf, array_length(hf));
 170     proto_register_subtree_array(ett, array_length(ett));
 171 }
 172
 173 void
 174 proto_reg_handoff_vmlab(void)
 175 {
 176     dissector_handle_t vmlab_handle;
 177
 178     vmlab_handle = create_dissector_handle(dissect_vmlab, proto_vmlab);
 179
 180     dissector_add_uint("ethertype", ETHERTYPE_VMLAB, vmlab_handle);
 181 }