forked from osmocom/wireshark
327 lines
9.6 KiB
C
327 lines
9.6 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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* Copyright 2005 Joerg Mayer (see AUTHORS file)
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* Updates for newer versions by Jason Masker <jason at masker.net>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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* Some information on ERSPAN type III can be found at:
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* http://www.cisco.com/en/US/docs/switches/datacenter/nexus1000/sw/4_0_4_s_v_1_3/system_management/configuration/guide/n1000v_system_9span.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 (version 1) or 0x22EB (version 2).
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*
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* ERSPAN type II is version 1
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* ERSPAN type III is version 2
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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 (version 1)
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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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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include "packet-gre.h"
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void proto_register_erspan(void);
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void proto_reg_handoff_erspan(void);
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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_version = -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_truncated = -1;
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static int hf_erspan_spanid = -1;
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static int hf_erspan_timestamp = -1;
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static int hf_erspan_unknown4 = -1;
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static int hf_erspan_direction2 = -1;
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static int hf_erspan_unknown5 = -1;
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static int hf_erspan_unknown6 = -1;
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static int hf_erspan_unknown7 = -1;
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static expert_field ei_erspan_version_unknown = EI_INIT;
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#define PROTO_SHORT_NAME "ERSPAN"
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#define PROTO_LONG_NAME "Encapsulated Remote Switch Packet ANalysis"
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/* Global ERSPAN Preference */
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static gboolean pref_fake_erspan = FALSE;
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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 const value_string erspan_truncated_vals[] = {
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{0, "Not truncated"},
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{1, "Truncated"},
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{0, NULL},
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};
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static const value_string erspan_version_vals[] = {
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{1, "Type II"},
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{2, "Type III"},
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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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erspan_fmt_timestamp(gchar *result, guint32 timeval)
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{
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g_snprintf(result, ITEM_LABEL_LENGTH, "%.4f", (((gfloat)timeval)/10000));
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}
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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_item *ti_ver;
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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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guint16 version;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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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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ENC_NA);
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erspan_tree = proto_item_add_subtree(ti, ett_erspan);
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}
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if(pref_fake_erspan) {
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/* Some vendor don't include ERSPAN Header...*/
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eth_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(ethnofcs_handle, eth_tvb, pinfo, tree);
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return;
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}
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version = tvb_get_ntohs(tvb, offset) >> 12;
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if (tree) {
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ti_ver = proto_tree_add_item(erspan_tree, hf_erspan_version, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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if ((version != 1) && (version != 2 )) {
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expert_add_info(pinfo, ti_ver, &ei_erspan_version_unknown);
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return;
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}
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proto_tree_add_item(erspan_tree, hf_erspan_vlan, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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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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ENC_BIG_ENDIAN);
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proto_tree_add_item(erspan_tree, hf_erspan_unknown2, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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if (version == 1)
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proto_tree_add_item(erspan_tree, hf_erspan_direction, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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else /* version = 2 */
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proto_tree_add_item(erspan_tree, hf_erspan_unknown3, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(erspan_tree, hf_erspan_truncated, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(erspan_tree, hf_erspan_spanid, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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if (version == 2) {
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proto_tree_add_item(erspan_tree, hf_erspan_timestamp, tvb,
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offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(erspan_tree, hf_erspan_unknown4, tvb,
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offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(erspan_tree, hf_erspan_direction2, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(erspan_tree, hf_erspan_unknown5, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(erspan_tree, hf_erspan_unknown6, tvb,
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offset, 4, ENC_NA);
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offset += 4;
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}
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proto_tree_add_item(erspan_tree, hf_erspan_unknown7, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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}
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else {
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offset += 8;
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if (version == 2)
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offset += 12;
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}
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eth_tvb = tvb_new_subset_remaining(tvb, offset);
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call_dissector(ethnofcs_handle, eth_tvb, pinfo, tree);
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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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module_t *erspan_module;
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expert_module_t* expert_erspan;
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static hf_register_info hf[] = {
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{ &hf_erspan_version,
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{ "Version", "erspan.version", FT_UINT16, BASE_DEC, VALS(erspan_version_vals),
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0xf000, NULL, 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, NULL, 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, NULL, 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, NULL, 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, NULL, HFILL }},
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{ &hf_erspan_unknown3,
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{ "Unknown3", "erspan.unknown3", FT_UINT16, BASE_DEC, NULL,
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0x0800, NULL, HFILL }},
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{ &hf_erspan_truncated,
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{ "Truncated", "erspan.truncated", FT_UINT16, BASE_DEC, VALS(erspan_truncated_vals),
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0x0400, "ERSPAN packet exceeded the MTU size", 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, NULL, HFILL }},
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{ &hf_erspan_timestamp,
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{ "Timestamp", "erspan.timestamp", FT_UINT32, BASE_CUSTOM, CF_FUNC(erspan_fmt_timestamp),
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0, NULL, 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, NULL, HFILL }},
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{ &hf_erspan_direction2,
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{ "Direction2", "erspan.direction2", FT_UINT16, BASE_DEC, VALS(erspan_direction_vals),
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0x0008, NULL, HFILL }},
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{ &hf_erspan_unknown5,
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{ "Unknown5", "erspan.unknown5", FT_UINT16, BASE_HEX, NULL,
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0xfff7, NULL, HFILL }},
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{ &hf_erspan_unknown6,
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{ "Unknown6", "erspan.unknown6", FT_BYTES, BASE_NONE, NULL,
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0, NULL, HFILL }},
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{ &hf_erspan_unknown7,
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{ "Unknown7", "erspan.unknown7", FT_BYTES, BASE_NONE, NULL,
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0, NULL, 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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static ei_register_info ei[] = {
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{ &ei_erspan_version_unknown, { "erspan.version.unknown", PI_UNDECODED, PI_WARN, "Unknown version, please report or test to use fake ERSPAN preference", EXPFILL }},
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};
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proto_erspan = proto_register_protocol(PROTO_LONG_NAME, 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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expert_erspan = expert_register_protocol(proto_erspan);
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expert_register_field_array(expert_erspan, ei, array_length(ei));
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/* register dissection preferences */
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erspan_module = prefs_register_protocol(proto_erspan, NULL);
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prefs_register_bool_preference(erspan_module, "fake_erspan",
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"FORCE to decode fake ERSPAN frame",
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"When set, dissector will FORCE to decode directly Ethernet Frame"
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"Some vendor use fake ERSPAN frame (with not ERSPAN Header)",
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&pref_fake_erspan);
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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_uint("gre.proto", GRE_ERSPAN_88BE, erspan_handle);
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dissector_add_uint("gre.proto", GRE_ERSPAN_22EB, erspan_handle);
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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: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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