/* packet-openflow.c * Routines for OpenFlow dissection * Copyright 2013, Anders Broman * Copyright 2013, Zoltan Lajos Kis * * 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. * * Ref https://www.opennetworking.org/sdn-resources/onf-specifications/openflow */ #include "config.h" #include #include #include #include "packet-tcp.h" void proto_register_openflow(void); void proto_reg_handoff_openflow(void); #define OFP_LEGACY_PORT 6633 #define OFP_LEGACY2_PORT 6634 #define OFP_IANA_PORT 6653 static int g_openflow_port = OFP_IANA_PORT; static dissector_handle_t openflow_handle; static dissector_handle_t openflow_v1_handle; static dissector_handle_t openflow_v4_handle; static dissector_handle_t openflow_v5_handle; /* Initialize the protocol and registered fields */ static int proto_openflow = -1; static int hf_openflow_version = -1; static expert_field ei_openflow_version = EI_INIT; static gboolean openflow_desegment = TRUE; #define OFP_VERSION_1_0 1 #define OFP_VERSION_1_1 2 #define OFP_VERSION_1_2 3 #define OFP_VERSION_1_3 4 #define OFP_VERSION_1_4 5 static const value_string openflow_version_values[] = { { 0x01, "1.0" }, { 0x02, "1.1" }, { 0x03, "1.2" }, { 0x04, "1.3" }, { 0x05, "1.4" }, { 0, NULL } }; static guint get_openflow_pdu_length(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_) { return tvb_get_ntohs(tvb, offset + 2); } static int dissect_openflow_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { guint offset = 0; guint8 version; proto_item* ti; version = tvb_get_guint8(tvb, 0); /* Set the Protocol column to the constant string of openflow */ col_set_str(pinfo->cinfo, COL_PROTOCOL, "OpenFlow"); col_clear(pinfo->cinfo,COL_INFO); switch(version){ case OFP_VERSION_1_0: call_dissector(openflow_v1_handle, tvb, pinfo, tree); break; case OFP_VERSION_1_3: call_dissector(openflow_v4_handle, tvb, pinfo, tree); break; case OFP_VERSION_1_4: call_dissector(openflow_v5_handle, tvb, pinfo, tree); break; default: ti = proto_tree_add_item(tree, hf_openflow_version, tvb, offset, 1, ENC_BIG_ENDIAN); expert_add_info(pinfo, ti, &ei_openflow_version); break; } return tvb_reported_length(tvb); } #define OFP_HEADER_LEN 8 static int dissect_openflow(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { tcp_dissect_pdus(tvb, pinfo, tree, openflow_desegment, OFP_HEADER_LEN, get_openflow_pdu_length, dissect_openflow_tcp_pdu, data); return tvb_captured_length(tvb); } static gboolean dissect_openflow_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { conversation_t *conversation = NULL; if ((pinfo->destport != OFP_LEGACY_PORT) && (pinfo->destport != OFP_LEGACY2_PORT) && (pinfo->destport != OFP_IANA_PORT) && (pinfo->destport != (guint32)g_openflow_port)) { return FALSE; } conversation = find_or_create_conversation(pinfo); conversation_set_dissector(conversation, openflow_handle); dissect_openflow(tvb, pinfo, tree, data); return TRUE; } /* * Register the protocol with Wireshark. */ void proto_register_openflow(void) { static hf_register_info hf[] = { { &hf_openflow_version, { "Version", "openflow.version", FT_UINT8, BASE_HEX, VALS(openflow_version_values), 0x7f, NULL, HFILL } } }; static ei_register_info ei[] = { { &ei_openflow_version, { "openflow.version.unknown", PI_UNDECODED, PI_WARN, "Unsupported version not dissected", EXPFILL }}, }; module_t *openflow_module; expert_module_t* expert_openflow; /* Register the protocol name and description */ proto_openflow = proto_register_protocol("OpenFlow", "OpenFlow", "openflow"); openflow_handle = register_dissector("openflow", dissect_openflow, proto_openflow); /* Required function calls to register the header fields and subtrees */ proto_register_field_array(proto_openflow, hf, array_length(hf)); expert_openflow = expert_register_protocol(proto_openflow); expert_register_field_array(expert_openflow, ei, array_length(ei)); openflow_module = prefs_register_protocol(proto_openflow, proto_reg_handoff_openflow); /* Register port preference */ prefs_register_uint_preference(openflow_module, "tcp.port", "OpenFlow TCP port", "OpenFlow TCP port (6653 is the IANA assigned port)", 10, &g_openflow_port); /* Register heuristic preference */ prefs_register_obsolete_preference(openflow_module, "heuristic"); /* Register desegment preference */ prefs_register_bool_preference(openflow_module, "desegment", "Reassemble OpenFlow messages spanning multiple TCP segments", "Whether the OpenFlow dissector should reassemble messages spanning multiple TCP segments." " To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.", &openflow_desegment); } void proto_reg_handoff_openflow(void) { static gboolean initialized = FALSE; static int currentPort; if (!initialized) { heur_dissector_add("tcp", dissect_openflow_heur, "OpenFlow over TCP", "openflow_tcp", proto_openflow, HEURISTIC_ENABLE); initialized = TRUE; } else { dissector_delete_uint("tcp.port", currentPort, openflow_handle); } currentPort = g_openflow_port; dissector_add_uint("tcp.port", currentPort, openflow_handle); openflow_v1_handle = find_dissector_add_dependency("openflow_v1", proto_openflow); openflow_v4_handle = find_dissector_add_dependency("openflow_v4", proto_openflow); openflow_v5_handle = find_dissector_add_dependency("openflow_v5", proto_openflow); } /* * 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: */