/* packet-vxlan.c * * Routines for Virtual eXtensible Local Area Network (VXLAN) packet dissection * * 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. * * Protocol ref: * http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-08 */ #include "config.h" #include #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: */