forked from osmocom/wireshark
197 lines
5.5 KiB
C
197 lines
5.5 KiB
C
/* packet-erspan.c
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* Routines for the disassembly of Cisco's ERSPAN protocol
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*
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* $Id$
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*
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* Copyright 2005 Joerg Mayer (see AUTHORS file)
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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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* TODO:
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* Find out the Unknown values
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*
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* Specs:
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* No real specs exist. Some general description can be found at:
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* http://www.cisco.com/en/US/products/hw/routers/ps368/products_configuration_guide_chapter09186a008069952a.html
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*
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* For ERSPAN packets, the “protocol type” field value in the GRE header
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* is 0x88BE.
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*
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* 0000000: d4c3 b2a1 0200 0400 0000 0000 0000 0000 <-- pcap header
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* 0000010: ffff 0000
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* 0000010: 7100 0000 <-- 0x71 (DLT_TYPE) = linux_cooked_capture (of course not)
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* 0000010: 7507 f845 11d1 0500 <-- pcap record header
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* 0000020: 7a00 0000 7a00 0000
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* 0000020: 0000 030a 0000 0000 <-- unknown
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* 0000030: 0000 0000
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* 0000030: 0000 88be <-- GRE header
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* 0000030: 1002 0001 0000 0380 <-- ERSPAN header (01: erspan-id)
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* 0000040: 00d0 b7a7 7480 0015 c721 75c0 0800 4500 <-- Ethernet packet
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* ...
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*
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/greproto.h>
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static int proto_erspan = -1;
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static gint ett_erspan = -1;
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static int hf_erspan_unknown1 = -1;
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static int hf_erspan_vlan = -1;
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static int hf_erspan_priority = -1;
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static int hf_erspan_unknown2 = -1;
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static int hf_erspan_direction = -1;
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static int hf_erspan_unknown3 = -1;
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static int hf_erspan_spanid = -1;
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static int hf_erspan_unknown4 = -1;
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#define PROTO_SHORT_NAME "ERSPAN"
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#define PROTO_LONG_NAME "ER Switch Packet Analysis"
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#define ERSPAN_DIRECTION_INCOMING 0
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#define ERSPAN_DIRECTION_OUTGOING 1
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static const value_string erspan_direction_vals[] = {
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{ERSPAN_DIRECTION_INCOMING, "Incoming"},
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{ERSPAN_DIRECTION_OUTGOING, "Outgoing"},
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{0, NULL},
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};
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static dissector_handle_t ethnofcs_handle;
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static void
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dissect_erspan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *erspan_tree = NULL;
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tvbuff_t *eth_tvb;
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guint32 offset = 0;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME ":");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_erspan, tvb, offset, -1,
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FALSE);
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erspan_tree = proto_item_add_subtree(ti, ett_erspan);
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proto_tree_add_item(erspan_tree, hf_erspan_unknown1, tvb, offset, 2,
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FALSE);
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proto_tree_add_item(erspan_tree, hf_erspan_vlan, tvb, offset, 2,
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FALSE);
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offset += 2;
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proto_tree_add_item(erspan_tree, hf_erspan_priority, tvb, offset, 2,
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FALSE);
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proto_tree_add_item(erspan_tree, hf_erspan_unknown2, tvb, offset, 2,
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FALSE);
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proto_tree_add_item(erspan_tree, hf_erspan_direction, tvb, offset, 2,
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FALSE);
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proto_tree_add_item(erspan_tree, hf_erspan_unknown3, tvb, offset, 2,
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FALSE);
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proto_tree_add_item(erspan_tree, hf_erspan_spanid, tvb, offset, 2,
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FALSE);
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offset += 2;
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proto_tree_add_item(erspan_tree, hf_erspan_unknown4, tvb, offset, 4,
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FALSE);
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offset += 4;
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eth_tvb = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(ethnofcs_handle, eth_tvb, pinfo, tree);
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}
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}
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void
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proto_register_erspan(void)
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{
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static hf_register_info hf[] = {
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{ &hf_erspan_unknown1,
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{ "Unknown1", "erspan.unknown1", FT_UINT16, BASE_HEX, NULL,
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0xf000, "", HFILL }},
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{ &hf_erspan_vlan,
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{ "Vlan", "erspan.vlan", FT_UINT16, BASE_DEC, NULL,
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0x0fff, "", HFILL }},
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{ &hf_erspan_priority,
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{ "Priority", "erspan.priority", FT_UINT16, BASE_DEC, NULL,
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0xe000, "", HFILL }},
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{ &hf_erspan_unknown2,
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{ "Unknown2", "erspan.unknown2", FT_UINT16, BASE_DEC, NULL,
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0x1000, "", HFILL }},
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{ &hf_erspan_direction,
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{ "Direction", "erspan.direction", FT_UINT16, BASE_DEC, VALS(erspan_direction_vals),
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0x0800, "", HFILL }},
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{ &hf_erspan_unknown3,
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{ "Unknown3", "erspan.unknown3", FT_UINT16, BASE_DEC, NULL,
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0x0400, "", HFILL }},
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{ &hf_erspan_spanid,
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{ "SpanID", "erspan.spanid", FT_UINT16, BASE_DEC, NULL,
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0x03ff, "", HFILL }},
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{ &hf_erspan_unknown4,
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{ "Unknown4", "erspan.unknown4", FT_BYTES, BASE_NONE, NULL,
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0, "", HFILL }},
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};
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static gint *ett[] = {
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&ett_erspan,
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};
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proto_erspan = proto_register_protocol(PROTO_LONG_NAME,
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PROTO_SHORT_NAME, "erspan");
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proto_register_field_array(proto_erspan, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_erspan(void)
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{
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dissector_handle_t erspan_handle;
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ethnofcs_handle = find_dissector("eth_withoutfcs");
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erspan_handle = create_dissector_handle(dissect_erspan, proto_erspan);
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dissector_add("gre.proto", GRE_ERSPAN, erspan_handle);
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}
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