forked from osmocom/wireshark
218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/* packet-vxlan.c
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*
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* Routines for Virtual eXtensible Local Area Network (VXLAN) packet dissection
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Protocol ref:
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* http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-08
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/tfs.h>
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#define UDP_PORT_VXLAN 4789
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void proto_register_vxlan(void);
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void proto_reg_handoff_vxlan(void);
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static int proto_vxlan = -1;
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static int hf_vxlan_flags = -1;
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static int hf_vxlan_flags_reserved = -1;
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static int hf_vxlan_flag_a = -1;
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static int hf_vxlan_flag_d = -1;
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static int hf_vxlan_flag_i = -1;
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static int hf_vxlan_flag_g = -1;
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static int hf_vxlan_gbp = -1;
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static int hf_vxlan_vni = -1;
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static int hf_vxlan_reserved_8 = -1;
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static int ett_vxlan = -1;
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static int ett_vxlan_flgs = -1;
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static const int *flags_fields[] = {
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&hf_vxlan_flag_g,
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&hf_vxlan_flag_d,
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&hf_vxlan_flag_i,
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&hf_vxlan_flag_a,
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&hf_vxlan_flags_reserved,
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NULL
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};
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static dissector_handle_t eth_handle;
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static void
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dissect_vxlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *vxlan_tree;
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proto_item *ti;
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tvbuff_t *next_tvb;
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int offset = 0;
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/* Make entry in Protocol column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "VxLAN");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_vxlan, tvb, offset, -1, ENC_NA);
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vxlan_tree = proto_item_add_subtree(ti, ett_vxlan);
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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VXLAN Header:
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| VXLAN Network Identifier (VNI) | Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/* Flags (16 bits) where the I flag MUST be set to 1 for a valid
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* VXLAN Network ID (VNI). The remaining 12 bits (designated "R") are
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* reserved fields and MUST be set to zero.
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*/
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proto_tree_add_bitmask(vxlan_tree, tvb, offset, hf_vxlan_flags,
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ett_vxlan_flgs, flags_fields, ENC_BIG_ENDIAN);
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offset+=2;
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proto_tree_add_item(vxlan_tree, hf_vxlan_gbp, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset+=2;
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proto_tree_add_item(vxlan_tree, hf_vxlan_vni, tvb, offset, 3, ENC_BIG_ENDIAN);
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offset+=3;
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proto_tree_add_item(vxlan_tree, hf_vxlan_reserved_8, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(eth_handle, next_tvb, pinfo, tree);
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}
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/* Register VxLAN with Wireshark */
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void
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proto_register_vxlan(void)
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{
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static hf_register_info hf[] = {
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{ &hf_vxlan_flags,
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{ "Flags", "vxlan.flags",
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FT_UINT16, BASE_HEX, NULL, 0x00,
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NULL, HFILL
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},
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},
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{ &hf_vxlan_flags_reserved,
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{ "Reserved(R)", "vxlan.flags_reserved",
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FT_BOOLEAN, 16, NULL, 0x77b7,
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NULL, HFILL,
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},
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},
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{ &hf_vxlan_flag_g,
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{ "GBP Extension", "vxlan.flag_g",
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FT_BOOLEAN, 16, TFS(&tfs_defined_not_defined), 0x8000,
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NULL, HFILL,
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},
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},
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{ &hf_vxlan_flag_i,
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{ "VXLAN Network ID (VNI)", "vxlan.flag_i",
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FT_BOOLEAN, 16, NULL, 0x0800,
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NULL, HFILL,
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},
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},
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{ &hf_vxlan_flag_d,
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{ "Don't Learn", "vxlan.flag_d",
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FT_BOOLEAN, 16, NULL, 0x0040,
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NULL, HFILL,
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},
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},
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{ &hf_vxlan_flag_a,
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{ "Policy Applied", "vxlan.flag_a",
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FT_BOOLEAN, 16, NULL, 0x0008,
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NULL, HFILL,
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},
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},
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{ &hf_vxlan_gbp,
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{ "Group Policy ID", "vxlan.gbp",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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NULL, HFILL
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},
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},
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{ &hf_vxlan_vni,
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{ "VXLAN Network Identifier (VNI)", "vxlan.vni",
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FT_UINT24, BASE_DEC, NULL, 0x00,
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NULL, HFILL
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},
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},
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{ &hf_vxlan_reserved_8,
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{ "Reserved", "vxlan.reserved8",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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NULL, HFILL
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},
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_vxlan,
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&ett_vxlan_flgs,
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};
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/* Register the protocol name and description */
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proto_vxlan = proto_register_protocol("Virtual eXtensible Local Area Network",
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"VXLAN", "vxlan");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_vxlan, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_vxlan(void)
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{
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dissector_handle_t vxlan_handle;
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eth_handle = find_dissector("eth");
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vxlan_handle = create_dissector_handle(dissect_vxlan, proto_vxlan);
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dissector_add_uint("udp.port", UDP_PORT_VXLAN, vxlan_handle);
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dissector_add_for_decode_as("udp.port", vxlan_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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