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wireshark/epan/dissectors/packet-vxlan.c

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/* packet-vxlan.c
*
* Routines for Virtual eXtensible Local Area Network (VXLAN) packet dissection
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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.
*
* Protocol ref:
* http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-08
*/
#include "config.h"
#include <epan/packet.h>
#define UDP_PORT_VXLAN 4789
void proto_register_vxlan(void);
void proto_reg_handoff_vxlan(void);
static int proto_vxlan = -1;
static int hf_vxlan_flags = -1;
static int hf_vxlan_flag_b7 = -1;
static int hf_vxlan_flag_b6 = -1;
static int hf_vxlan_flag_b5 = -1;
static int hf_vxlan_flag_b4 = -1;
static int hf_vxlan_flag_i = -1;
static int hf_vxlan_flag_b2 = -1;
static int hf_vxlan_flag_b1 = -1;
static int hf_vxlan_flag_b0 = -1;
static int hf_vxlan_reserved_24 = -1;
static int hf_vxlan_vni = -1;
static int hf_vxlan_reserved_8 = -1;
static int ett_vxlan = -1;
static int ett_vxlan_flgs = -1;
static dissector_handle_t eth_handle;
static void
dissect_vxlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *vxlan_tree, *flg_tree;
proto_item *ti, *flg_item;
tvbuff_t *next_tvb;
int offset = 0;
/* Make entry in Protocol column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "VxLAN");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_vxlan, tvb, offset, -1, ENC_NA);
vxlan_tree = proto_item_add_subtree(ti, ett_vxlan);
/*
0 1 2 3
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
VXLAN Header:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|R|R|R|R|I|R|R|R| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| VXLAN Network Identifier (VNI) | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* Flags (8 bits) where the I flag MUST be set to 1 for a valid
* VXLAN Network ID (VNI). The remaining 7 bits (designated "R") are
* reserved fields and MUST be set to zero.
*/
flg_item = proto_tree_add_item(vxlan_tree, hf_vxlan_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
flg_tree = proto_item_add_subtree(flg_item, ett_vxlan_flgs);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b7, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b6, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b5, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b4, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_i, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b2, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b1, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(flg_tree, hf_vxlan_flag_b0, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(vxlan_tree, hf_vxlan_reserved_24, tvb, offset, 3, ENC_BIG_ENDIAN);
offset+=3;
proto_tree_add_item(vxlan_tree, hf_vxlan_vni, tvb, offset, 3, ENC_BIG_ENDIAN);
offset+=3;
proto_tree_add_item(vxlan_tree, hf_vxlan_reserved_8, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
next_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(eth_handle, next_tvb, pinfo, tree);
}
/* Register VxLAN with Wireshark */
void
proto_register_vxlan(void)
{
static hf_register_info hf[] = {
{ &hf_vxlan_flags,
{ "Flags", "vxlan.flags",
FT_UINT8, BASE_HEX, NULL, 0x00,
NULL, HFILL
},
},
{ &hf_vxlan_flag_b7,
{ "Reserved(R)", "vxlan.flag_b7",
FT_BOOLEAN, 8, NULL, 0x80,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b6,
{ "Reserved(R)", "vxlan.flag_b6",
FT_BOOLEAN, 8, NULL, 0x40,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b5,
{ "Reserved(R)", "vxlan.flag_b5",
FT_BOOLEAN, 8, NULL, 0x20,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b4,
{ "Reserved(R)", "vxlan.flag_b4",
FT_BOOLEAN, 8, NULL, 0x10,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_i,
{ "VXLAN Network ID(VNI)", "vxlan.flag_i",
FT_BOOLEAN, 8, TFS(&tfs_present_not_present), 0x08,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b2,
{ "Reserved(R)", "vxlan.flag_b2",
FT_BOOLEAN, 8, NULL, 0x10,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b1,
{ "Reserved(R)", "vxlan.flag_b1",
FT_BOOLEAN, 8, NULL, 0x10,
NULL, HFILL,
},
},
{ &hf_vxlan_flag_b0,
{ "Reserved(R)", "vxlan.flag_b0",
FT_BOOLEAN, 8, NULL, 0x10,
NULL, HFILL,
},
},
{ &hf_vxlan_reserved_24,
{ "Reserved", "vxlan.reserved24",
FT_UINT24, BASE_HEX, NULL, 0x00,
NULL, HFILL
},
},
{ &hf_vxlan_vni,
{ "VXLAN Network Identifier (VNI)", "vxlan.vni",
FT_UINT24, BASE_DEC, NULL, 0x00,
NULL, HFILL
},
},
{ &hf_vxlan_reserved_8,
{ "Reserved", "vxlan.reserved8",
FT_UINT8, BASE_DEC, NULL, 0x00,
NULL, HFILL
},
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_vxlan,
&ett_vxlan_flgs,
};
/* Register the protocol name and description */
proto_vxlan = proto_register_protocol("Virtual eXtensible Local Area Network",
"VXLAN", "vxlan");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_vxlan, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_vxlan(void)
{
dissector_handle_t vxlan_handle;
eth_handle = find_dissector("eth");
vxlan_handle = create_dissector_handle(dissect_vxlan, proto_vxlan);
dissector_add_uint("udp.port", UDP_PORT_VXLAN, vxlan_handle);
dissector_add_for_decode_as("udp.port", vxlan_handle);
}
/*
* 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:
*/
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