/* packet-vmlab.c * Routines for VMware Lab Manager Frame Dis-assembly * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* History * * Apr 4, 2010 - David Aggeler * * - Initial version based on packet-vlan.c * * VMware Lab Manager is using this encapsulation directly as Ethernet Frames * or inside VLANs. The Ethernet type was originally registered to Akimbi, but VMware * acquired this company in 2006. No public information found, so the decoding here * is an educated guess. Since one of the features of Lab Manager is to separate * VMs with equal host name, IP and MAC Address, I expect the upper layer dissectors * (namely ARP, ICMP, IP, TCP) to create false alerts, since identical configurations * may communicate at the same time. The main goal of this dissector is to be able * to troubleshoot connectivity, preferably pings. It's also a little to understand * as to how host spanning fenced configurations actually talk. * */ #include "config.h" #include #include #include void proto_register_vmlab(void); void proto_reg_handoff_vmlab(void); static dissector_handle_t ethertype_handle; static int proto_vmlab = -1; static int hf_vmlab_flags_part1 = -1; /* Unknown so far */ static int hf_vmlab_flags_fragment = -1; static int hf_vmlab_flags_part2 = -1; /* Unknown so far */ static int hf_vmlab_portgroup = -1; static int hf_vmlab_eth_src = -1; static int hf_vmlab_eth_dst = -1; static int hf_vmlab_eth_addr = -1; static int hf_vmlab_etype = -1; static int hf_vmlab_trailer = -1; static gint ett_vmlab = -1; static const value_string fragment_vals[] = { { 0, "Not set" }, { 1, "Set" }, { 0, NULL } }; static int dissect_vmlab(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_tree* vmlab_tree; proto_item* ti; guint32 offset=0; guint8 attributes; guint8 portgroup; ethertype_data_t ethertype_data; guint16 encap_proto; col_set_str(pinfo->cinfo, COL_PROTOCOL, "VMLAB"); col_clear(pinfo->cinfo, COL_INFO); ti = proto_tree_add_item(tree, proto_vmlab, tvb, 0, 24, ENC_NA); vmlab_tree = proto_item_add_subtree(ti, ett_vmlab); /* Flags*/ attributes = tvb_get_guint8(tvb, offset); proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part1, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(vmlab_tree, hf_vmlab_flags_fragment, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(vmlab_tree, hf_vmlab_flags_part2, tvb, offset, 1, ENC_BIG_ENDIAN); if (attributes & 0x04) { proto_item_append_text(ti, ", Fragment"); } offset += 1; /* Portgroup*/ portgroup = tvb_get_guint8(tvb, offset); proto_tree_add_uint(vmlab_tree, hf_vmlab_portgroup, tvb, offset, 1, portgroup); proto_item_append_text(ti, ", Portgroup: %d", portgroup); offset += 1; /* The next two bytes were always 0x0000 as far as I could tell*/ offset += 2; /* Not really clear, what the difference between this and the next MAC address is Both are usually equal*/ proto_tree_add_item(vmlab_tree, hf_vmlab_eth_addr, tvb, offset, 6, ENC_NA); offset += 6; proto_tree_add_item(vmlab_tree, hf_vmlab_eth_dst, tvb, offset, 6, ENC_NA); offset += 6; /* Source MAC*/ proto_tree_add_item(vmlab_tree, hf_vmlab_eth_src, tvb, offset, 6, ENC_NA); offset += 6; proto_item_append_text(ti, ", Src: %s, Dst: %s", tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, offset-6), tvb_address_with_resolution_to_str(wmem_packet_scope(), tvb, AT_ETHER, offset-12)); /* Encapsulated Ethertype is also part of the block*/ encap_proto = tvb_get_ntohs(tvb, offset); offset += 2; /* Now call whatever was encapsulated*/ ethertype_data.etype = encap_proto; ethertype_data.offset_after_ethertype = offset; ethertype_data.fh_tree = vmlab_tree; ethertype_data.etype_id = hf_vmlab_etype; ethertype_data.trailer_id = hf_vmlab_trailer; ethertype_data.fcs_len = 0; call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data); return tvb_captured_length(tvb); } void proto_register_vmlab(void) { static hf_register_info hf[] = { { &hf_vmlab_flags_part1, { "Unknown", "vmlab.unknown1", FT_UINT8, BASE_HEX, NULL, 0xF8, NULL, HFILL }}, { &hf_vmlab_flags_fragment, { "More Fragments", "vmlab.fragment", FT_UINT8, BASE_DEC, VALS(fragment_vals), 0x04, NULL, HFILL }}, { &hf_vmlab_flags_part2, { "Unknown", "vmlab.unknown2", FT_UINT8, BASE_HEX, NULL, 0x03, NULL, HFILL }}, { &hf_vmlab_portgroup, { "Portgroup", "vmlab.pgrp", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_vmlab_eth_src, { "Source", "vmlab.src", FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_vmlab_eth_dst, { "Destination", "vmlab.dst", FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_vmlab_eth_addr, { "Address", "vmlab.addr", FT_ETHER, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_vmlab_etype, { "Encapsulated Type", "vmlab.subtype", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }}, { &hf_vmlab_trailer, { "Trailer", "vmlab.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }} }; static gint *ett[] = { &ett_vmlab }; proto_vmlab = proto_register_protocol("VMware Lab Manager", "VMLAB", "vmlab"); proto_register_field_array(proto_vmlab, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_vmlab(void) { dissector_handle_t vmlab_handle; vmlab_handle = create_dissector_handle(dissect_vmlab, proto_vmlab); dissector_add_uint("ethertype", ETHERTYPE_VMLAB, vmlab_handle); ethertype_handle = find_dissector_add_dependency("ethertype", proto_vmlab); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */