epan/dissectors/packet-vxlan.c

   1 /* packet-vxlan.c
   2  *
   3  * Routines for Virtual eXtensible Local Area Network (VXLAN) packet dissection
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  *
  25  * Protocol ref:
  26  * http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-00
  27  */
  28
  29
  30 #include "config.h"
  31
  32 #include <epan/packet.h>
  33
  34
  35
  36 static int proto_vxlan = -1;
  37
  38 static int hf_vxlan_flags = -1;
  39 static int hf_vxlan_flag_b7 = -1;
  40 static int hf_vxlan_flag_b6 = -1;
  41 static int hf_vxlan_flag_b5 = -1;
  42 static int hf_vxlan_flag_b4 = -1;
  43 static int hf_vxlan_flag_i = -1;
  44 static int hf_vxlan_flag_b2 = -1;
  45 static int hf_vxlan_flag_b1 = -1;
  46 static int hf_vxlan_flag_b0 = -1;
  47 static int hf_vxlan_reserved_24 = -1;
  48 static int hf_vxlan_vni = -1;
  49 static int hf_vxlan_reserved_8 = -1;
  50
  51
  52 static int ett_vxlan = -1;
  53 static int ett_vxlan_flgs = -1;
  54
  55
  56 static dissector_handle_t eth_handle;
  57
  58 static void
  59 dissect_vxlan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  60 {
  61     proto_tree *vxlan_tree, *flg_tree;
  62     proto_item *ti, *flg_item;
  63     tvbuff_t *next_tvb;
  64     int offset = 0;
  65
  66     /* Make entry in Protocol column on summary display */
  67     col_set_str(pinfo->cinfo, COL_PROTOCOL, "VxLAN");
  68
  69     col_clear(pinfo->cinfo, COL_INFO);
  70
  71     ti = proto_tree_add_item(tree, proto_vxlan, tvb, offset, -1, ENC_NA);
  72     vxlan_tree = proto_item_add_subtree(ti, ett_vxlan);
  73
  74 /*
  75               0                   1                   2                   3
  76             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
  77         VXLAN Header:
  78            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79            |R|R|R|R|I|R|R|R|            Reserved                           |
  80            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  81            |                VXLAN Network Identifier (VNI) |   Reserved    |
  82            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  83 */
  84     /* Flags (8 bits) where the I flag MUST be set  to 1 for a valid
  85      *    VXLAN Network ID (VNI).  The remaining 7 bits (designated "R") are
  86      *    reserved fields and MUST be set to zero.
  87      */
  88     flg_item = proto_tree_add_item(vxlan_tree, hf_vxlan_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
  89     flg_tree = proto_item_add_subtree(flg_item, ett_vxlan_flgs);
  90
  91     proto_tree_add_item(flg_tree, hf_vxlan_flag_b7, tvb, offset, 1, ENC_BIG_ENDIAN);
  92     proto_tree_add_item(flg_tree, hf_vxlan_flag_b6, tvb, offset, 1, ENC_BIG_ENDIAN);
  93     proto_tree_add_item(flg_tree, hf_vxlan_flag_b5, tvb, offset, 1, ENC_BIG_ENDIAN);
  94     proto_tree_add_item(flg_tree, hf_vxlan_flag_b4, tvb, offset, 1, ENC_BIG_ENDIAN);
  95
  96     proto_tree_add_item(flg_tree, hf_vxlan_flag_i,  tvb, offset, 1, ENC_BIG_ENDIAN);
  97     proto_tree_add_item(flg_tree, hf_vxlan_flag_b2, tvb, offset, 1, ENC_BIG_ENDIAN);
  98     proto_tree_add_item(flg_tree, hf_vxlan_flag_b1, tvb, offset, 1, ENC_BIG_ENDIAN);
  99     proto_tree_add_item(flg_tree, hf_vxlan_flag_b0, tvb, offset, 1, ENC_BIG_ENDIAN);
 100     offset++;
 101
 102     proto_tree_add_item(vxlan_tree, hf_vxlan_reserved_24, tvb, offset, 3, ENC_BIG_ENDIAN);
 103     offset+=3;
 104
 105     proto_tree_add_item(vxlan_tree, hf_vxlan_vni, tvb, offset, 3, ENC_BIG_ENDIAN);
 106     offset+=3;
 107
 108
 109     proto_tree_add_item(vxlan_tree, hf_vxlan_reserved_8, tvb, offset, 1, ENC_BIG_ENDIAN);
 110     offset++;
 111
 112     next_tvb = tvb_new_subset_remaining(tvb, offset);
 113     call_dissector(eth_handle, next_tvb, pinfo, tree);
 114
 115 }
 116
 117
 118 /* Register VxLAN with Wireshark */
 119 void
 120 proto_register_vxlan(void)
 121 {
 122     static hf_register_info hf[] = {
 123         { &hf_vxlan_flags,
 124           { "Flags", "vxlan.flags",
 125             FT_UINT8, BASE_HEX, NULL, 0x00,
 126             NULL, HFILL
 127           },
 128         },
 129         { &hf_vxlan_flag_b7,
 130           { "Reserved(R)", "vxlan.flag_b7",
 131             FT_BOOLEAN, 8, NULL, 0x80,
 132             NULL, HFILL,
 133           },
 134         },
 135         { &hf_vxlan_flag_b6,
 136           { "Reserved(R)", "vxlan.flag_b6",
 137             FT_BOOLEAN, 8, NULL, 0x40,
 138             NULL, HFILL,
 139           },
 140         },
 141         { &hf_vxlan_flag_b5,
 142           { "Reserved(R)", "vxlan.flag_b5",
 143             FT_BOOLEAN, 8, NULL, 0x20,
 144             NULL, HFILL,
 145           },
 146         },
 147         { &hf_vxlan_flag_b4,
 148           { "Reserved(R)", "vxlan.flag_b4",
 149             FT_BOOLEAN, 8, NULL, 0x10,
 150             NULL, HFILL,
 151           },
 152         },
 153         { &hf_vxlan_flag_i,
 154           { "VXLAN Network ID(VNI)", "vxlan.flag_i",
 155             FT_BOOLEAN, 8, TFS(&tfs_present_not_present), 0x08,
 156             NULL, HFILL,
 157           },
 158         },
 159         { &hf_vxlan_flag_b2,
 160           { "Reserved(R)", "vxlan.flag_b2",
 161             FT_BOOLEAN, 8, NULL, 0x10,
 162             NULL, HFILL,
 163           },
 164         },
 165         { &hf_vxlan_flag_b1,
 166           { "Reserved(R)", "vxlan.flag_b1",
 167             FT_BOOLEAN, 8, NULL, 0x10,
 168             NULL, HFILL,
 169           },
 170         },
 171         { &hf_vxlan_flag_b0,
 172           { "Reserved(R)", "vxlan.flag_b0",
 173             FT_BOOLEAN, 8, NULL, 0x10,
 174             NULL, HFILL,
 175           },
 176         },
 177         { &hf_vxlan_reserved_24,
 178           { "Reserved", "vxlan.reserved24",
 179             FT_UINT24, BASE_HEX, NULL, 0x00,
 180             NULL, HFILL
 181           },
 182         },
 183         { &hf_vxlan_vni,
 184           { "VXLAN Network Identifier (VNI)", "vxlan.vni",
 185             FT_UINT24, BASE_DEC, NULL, 0x00,
 186             NULL, HFILL
 187           },
 188         },
 189         { &hf_vxlan_reserved_8,
 190           { "Reserved", "vxlan.reserved8",
 191             FT_UINT8, BASE_DEC, NULL, 0x00,
 192             NULL, HFILL
 193           },
 194         },
 195     };
 196
 197     /* Setup protocol subtree array */
 198     static gint *ett[] = {
 199         &ett_vxlan,
 200         &ett_vxlan_flgs,
 201     };
 202
 203     /* Register the protocol name and description */
 204     proto_vxlan = proto_register_protocol("Virtual eXtensible Local Area Network",
 205                                           "VXLAN", "vxlan");
 206
 207     /* Required function calls to register the header fields and subtrees used */
 208     proto_register_field_array(proto_vxlan, hf, array_length(hf));
 209     proto_register_subtree_array(ett, array_length(ett));
 210
 211
 212 }
 213
 214 void
 215 proto_reg_handoff_vxlan(void)
 216 {
 217     dissector_handle_t vxlan_handle;
 218
 219     eth_handle = find_dissector("eth");
 220
 221     vxlan_handle = create_dissector_handle(dissect_vxlan, proto_vxlan);
 222     dissector_add_handle("udp.port", vxlan_handle);  /* For 'Decode As' */
 223 }
 224
 225 /*
 226  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 227  *
 228  * Local variables:
 229  * c-basic-offset: 4
 230  * tab-width: 8
 231  * indent-tabs-mode: nil
 232  * End:
 233  *
 234  * vi: set shiftwidth=4 tabstop=8 expandtab:
 235  * :indentSize=4:tabSize=8:noTabs=true:
 236  */
 237
 238