diff options
author | Jörg Mayer <jmayer@loplof.de> | 2007-04-14 01:07:36 +0000 |
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committer | Jörg Mayer <jmayer@loplof.de> | 2007-04-14 01:07:36 +0000 |
commit | 8f3934e24308dd7d19d1f6b2531c62e3931c4c75 (patch) | |
tree | 6adebf841fe1b0d6253a16370535d8e1f0e73c5f /epan/dissectors/packet-cisco-erspan.c | |
parent | d5b5c41fa9fb2001bd6f3298f7235e39c7f1cc69 (diff) |
Beginnings of a Cisco ERSPAN dissector - the only thing missing is the code
to actually call this (aka to handle the ambiguities of DLT values).
svn path=/trunk/; revision=21427
Diffstat (limited to 'epan/dissectors/packet-cisco-erspan.c')
-rw-r--r-- | epan/dissectors/packet-cisco-erspan.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/epan/dissectors/packet-cisco-erspan.c b/epan/dissectors/packet-cisco-erspan.c new file mode 100644 index 0000000000..8d90de25be --- /dev/null +++ b/epan/dissectors/packet-cisco-erspan.c @@ -0,0 +1,164 @@ +/* packet-extreme.c + * Routines for the disassembly of Cisco's ERSPAN protocol + * + * $Id$ + * + * Copyright 2005 Joerg Mayer (see AUTHORS file) + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* + * TODO: + * Find out the Unknown values + * + * Specs: + * No real specs exist. Some general description can be found at: + * http://www.cisco.com/en/US/products/hw/routers/ps368/products_configuration_guide_chapter09186a008069952a.html + * + * For ERSPAN packets, the “protocol type” field value in the GRE header + * is 0x88BE. + * + * 0000000: d4c3 b2a1 0200 0400 0000 0000 0000 0000 <-- pcap header + * 0000010: ffff 0000 + * 0000010: 7100 0000 <-- 0x71 (DLT_TYPE) = linux_cooked_capture (of course not) + * 0000010: 7507 f845 11d1 0500 <-- pcap record header + * 0000020: 7a00 0000 7a00 0000 + * 0000020: 0000 030a 0000 0000 <-- unknown + * 0000030: 0000 0000 + * 0000030: 0000 88be <-- GRE header + * 0000030: 1002 0001 0000 0380 <-- ERSPAN header (01: erspan-id) + * 0000040: 00d0 b7a7 7480 0015 c721 75c0 0800 4500 <-- Ethernet packet + * ... + * + * + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <glib.h> +#include <epan/packet.h> +#include <epan/greproto.h> + +static int proto_erspan = -1; + +static gint ett_erspan = -1; + +static int hf_erspan_unknown1 = -1; +static int hf_erspan_vlan = -1; +static int hf_erspan_unknown2 = -1; +static int hf_erspan_spanid = -1; +static int hf_erspan_unknown3 = -1; + +#define PROTO_SHORT_NAME "ERSPAN" +#define PROTO_LONG_NAME "ER Switch Packet Analysis" + +static dissector_handle_t ethnofcs_handle; + +static void +dissect_erspan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_item *ti; + proto_tree *erspan_tree = NULL; + tvbuff_t *eth_tvb; + guint32 offset = 0; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME); + if (check_col(pinfo->cinfo, COL_INFO)) + col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME ":"); + + if (tree) { + ti = proto_tree_add_item(tree, proto_erspan, tvb, offset, -1, + FALSE); + erspan_tree = proto_item_add_subtree(ti, ett_erspan); + + proto_tree_add_item(erspan_tree, hf_erspan_unknown1, tvb, offset, 2, + FALSE); + + proto_tree_add_item(erspan_tree, hf_erspan_vlan, tvb, offset, 2, + FALSE); + offset += 2; + + proto_tree_add_item(erspan_tree, hf_erspan_unknown2, tvb, offset, 2, + FALSE); + + proto_tree_add_item(erspan_tree, hf_erspan_spanid, tvb, offset, 2, + FALSE); + offset += 2; + + proto_tree_add_item(erspan_tree, hf_erspan_unknown3, tvb, offset, 4, + FALSE); + offset += 4; + + eth_tvb = tvb_new_subset(tvb, offset, -1, -1); + call_dissector(ethnofcs_handle, eth_tvb, pinfo, tree); + } +} + +void +proto_register_erspan(void) +{ + static hf_register_info hf[] = { + + { &hf_erspan_unknown1, + { "Unknown1", "erspan.unknown1", FT_UINT16, BASE_HEX, NULL, + 0xf000, "", HFILL }}, + + { &hf_erspan_vlan, + { "Vlan", "erspan.vlan", FT_UINT16, BASE_DEC, NULL, + 0x0fff, "", HFILL }}, + + { &hf_erspan_unknown2, + { "Unknown2", "erspan.unknown2", FT_UINT16, BASE_HEX, NULL, + 0xfc00, "", HFILL }}, + + { &hf_erspan_spanid, + { "SpanID", "erspan.spanid", FT_UINT16, BASE_DEC, NULL, + 0x03ff, "", HFILL }}, + + { &hf_erspan_unknown3, + { "Unknown3", "erspan.unknown3", FT_BYTES, BASE_NONE, NULL, + 0, "", HFILL }}, + + }; + static gint *ett[] = { + &ett_erspan, + }; + + proto_erspan = proto_register_protocol(PROTO_LONG_NAME, + PROTO_SHORT_NAME, "erspan"); + proto_register_field_array(proto_erspan, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); +} + +void +proto_reg_handoff_erspan(void) +{ + dissector_handle_t erspan_handle; + + ethnofcs_handle = find_dissector("eth_withoutfcs"); + + erspan_handle = create_dissector_handle(dissect_erspan, proto_erspan); + dissector_add("gre.proto", GRE_ERSPAN, erspan_handle); + +} + |