forked from osmocom/wireshark
215 lines
6.9 KiB
C
215 lines
6.9 KiB
C
/* packet-openflow.c
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* Routines for OpenFlow dissection
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* Copyright 2013, Anders Broman <anders.broman@ericsson.com>
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* Copyright 2013, Zoltan Lajos Kis <zoltan.lajos.kis@ericsson.com>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Ref https://www.opennetworking.org/sdn-resources/onf-specifications/openflow
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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/expert.h>
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#include <epan/prefs.h>
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#include <epan/prefs-int.h>
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#include "packet-tcp.h"
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void proto_register_openflow(void);
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void proto_reg_handoff_openflow(void);
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#define OFP_LEGACY_PORT 6633
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#define OFP_LEGACY2_PORT 6634
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#define OFP_IANA_PORT 6653
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static int g_openflow_port = OFP_IANA_PORT;
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static dissector_handle_t openflow_handle;
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static dissector_handle_t openflow_v1_handle;
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static dissector_handle_t openflow_v4_handle;
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static dissector_handle_t openflow_v5_handle;
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/* Initialize the protocol and registered fields */
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static int proto_openflow = -1;
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static int hf_openflow_version = -1;
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static expert_field ei_openflow_version = EI_INIT;
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static gboolean openflow_desegment = TRUE;
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#define OFP_VERSION_1_0 1
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#define OFP_VERSION_1_1 2
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#define OFP_VERSION_1_2 3
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#define OFP_VERSION_1_3 4
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#define OFP_VERSION_1_4 5
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static const value_string openflow_version_values[] = {
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{ 0x01, "1.0" },
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{ 0x02, "1.1" },
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{ 0x03, "1.2" },
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{ 0x04, "1.3" },
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{ 0x05, "1.4" },
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{ 0, NULL }
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};
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static guint
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get_openflow_pdu_length(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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{
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return tvb_get_ntohs(tvb, offset + 2);
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}
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static int
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dissect_openflow_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint offset = 0;
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guint8 version;
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proto_item* ti;
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version = tvb_get_guint8(tvb, 0);
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/* Set the Protocol column to the constant string of openflow */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "OpenFlow");
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col_clear(pinfo->cinfo,COL_INFO);
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switch(version){
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case OFP_VERSION_1_0:
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call_dissector(openflow_v1_handle, tvb, pinfo, tree);
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break;
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case OFP_VERSION_1_3:
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call_dissector(openflow_v4_handle, tvb, pinfo, tree);
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break;
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case OFP_VERSION_1_4:
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call_dissector(openflow_v5_handle, tvb, pinfo, tree);
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break;
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default:
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ti = proto_tree_add_item(tree, hf_openflow_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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expert_add_info(pinfo, ti, &ei_openflow_version);
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break;
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}
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return tvb_reported_length(tvb);
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}
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#define OFP_HEADER_LEN 8
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static int
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dissect_openflow(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, openflow_desegment, OFP_HEADER_LEN,
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get_openflow_pdu_length, dissect_openflow_tcp_pdu, data);
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return tvb_captured_length(tvb);
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}
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static gboolean
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dissect_openflow_heur(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree, void *data)
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{
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conversation_t *conversation = NULL;
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if ((pinfo->destport != OFP_LEGACY_PORT) &&
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(pinfo->destport != OFP_LEGACY2_PORT) &&
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(pinfo->destport != OFP_IANA_PORT) &&
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(pinfo->destport != (guint32)g_openflow_port)) {
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return FALSE;
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}
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conversation = find_or_create_conversation(pinfo);
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conversation_set_dissector(conversation, openflow_handle);
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dissect_openflow(tvb, pinfo, tree, data);
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return TRUE;
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}
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static void
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apply_openflow_prefs(void)
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{
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/* Openflow uses the port preference for heuristics */
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pref_t *openflow_port = prefs_find_preference(prefs_find_module("openflow"), "tcp.port");
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g_openflow_port = *openflow_port->varp.uint;
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}
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/*
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* Register the protocol with Wireshark.
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*/
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void
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proto_register_openflow(void)
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{
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static hf_register_info hf[] = {
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{ &hf_openflow_version,
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{ "Version", "openflow.version",
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FT_UINT8, BASE_HEX, VALS(openflow_version_values), 0x7f,
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NULL, HFILL }
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}
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};
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static ei_register_info ei[] = {
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{ &ei_openflow_version, { "openflow.version.unknown", PI_UNDECODED, PI_WARN, "Unsupported version not dissected", EXPFILL }},
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};
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module_t *openflow_module;
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expert_module_t* expert_openflow;
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/* Register the protocol name and description */
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proto_openflow = proto_register_protocol("OpenFlow",
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"OpenFlow", "openflow");
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openflow_handle = register_dissector("openflow", dissect_openflow, proto_openflow);
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/* Required function calls to register the header fields and subtrees */
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proto_register_field_array(proto_openflow, hf, array_length(hf));
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expert_openflow = expert_register_protocol(proto_openflow);
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expert_register_field_array(expert_openflow, ei, array_length(ei));
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openflow_module = prefs_register_protocol(proto_openflow, apply_openflow_prefs);
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/* Register heuristic preference */
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prefs_register_obsolete_preference(openflow_module, "heuristic");
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/* Register desegment preference */
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prefs_register_bool_preference(openflow_module, "desegment",
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"Reassemble OpenFlow messages spanning multiple TCP segments",
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"Whether the OpenFlow dissector should reassemble messages spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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&openflow_desegment);
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}
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void
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proto_reg_handoff_openflow(void)
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{
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heur_dissector_add("tcp", dissect_openflow_heur, "OpenFlow over TCP", "openflow_tcp", proto_openflow, HEURISTIC_ENABLE);
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dissector_add_uint_with_preference("tcp.port", OFP_IANA_PORT, openflow_handle);
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openflow_v1_handle = find_dissector_add_dependency("openflow_v1", proto_openflow);
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openflow_v4_handle = find_dissector_add_dependency("openflow_v4", proto_openflow);
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openflow_v5_handle = find_dissector_add_dependency("openflow_v5", proto_openflow);
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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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