2005-01-31 03:03:02 +00:00
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/* packet-redback.c
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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*
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* Start of RedBack SE400/800 tcpdump trace disassembly
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* Copyright 2005 Florian Lohoff <flo@rfc822.org>
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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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#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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2005-09-17 00:02:31 +00:00
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#include <epan/etypes.h>
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2005-01-31 03:03:02 +00:00
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#include "packet-ip.h"
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static int proto_redback = -1;
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static gint ett_redback = -1;
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static dissector_handle_t ipv4_handle;
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static dissector_handle_t eth_handle;
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static dissector_handle_t clnp_handle;
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static dissector_handle_t arp_handle;
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/* wrapper for passing the PIC type to the generic ATM dissector */
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static void
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dissect_redback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 l3off, dataoff, proto;
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guint32 context, flags;
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guint64 circuit;
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guint16 length;
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proto_item *ti,*tisub;
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proto_tree *subtree = NULL;
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tvbuff_t *next_tvb;
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context = tvb_get_ntohl(tvb, 0);
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flags = tvb_get_ntohl(tvb, 4);
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circuit = tvb_get_ntoh64(tvb, 8);
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length = tvb_get_ntohs(tvb, 16);
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2005-02-01 00:52:38 +00:00
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proto = (guint8) tvb_get_ntohs(tvb, 18);
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l3off = (guint8) tvb_get_ntohs(tvb, 20);
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dataoff = (guint8) tvb_get_ntohs(tvb, 22);
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2005-01-31 03:03:02 +00:00
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ti = proto_tree_add_text(tree, tvb, 0, length, "Redback");
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subtree = proto_item_add_subtree(ti, ett_redback);
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tisub = proto_tree_add_text (subtree, tvb, 0, 4,
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"Context: 0x%08x", context);
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tisub = proto_tree_add_text (subtree, tvb, 4, 4,
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"Flags: 0x%08x", flags);
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tisub = proto_tree_add_text (subtree, tvb, 8, 8,
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"Circuit: 0x%" PRIx64, circuit);
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tisub = proto_tree_add_text (subtree, tvb, 16, 2,
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"Length: %u", length);
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tisub = proto_tree_add_text (subtree, tvb, 18, 2,
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"Protocol: %u", proto);
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tisub = proto_tree_add_text (subtree, tvb, 20, 2,
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"Layer3 Offset: %u", l3off);
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tisub = proto_tree_add_text (subtree, tvb, 22, 2,
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"Data Offset: %u", dataoff);
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next_tvb = tvb_new_subset(tvb, l3off, -1, -1);
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/* Mark the gap as "Data" for now */
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if (dataoff > l3off) {
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proto_tree_add_text (subtree, tvb, 24, l3off-24, "Data");
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}
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/*
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* Just a guess - In case we see a difference in dataoff vs l3off
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* we assume there is an ethernet header. Traces from an OC12 didnt
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* show any header in here
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*/
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if (dataoff > l3off) {
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call_dissector(eth_handle, next_tvb, pinfo, tree);
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} else {
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switch(proto) {
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case 0x01:
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/*
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* IP - We assume IPv6 has a different protocol although
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* i might be wrong - Havent seen any traces
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*/
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call_dissector(ipv4_handle, next_tvb, pinfo, tree);
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break;
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case 0x02:
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/*
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* It is CLNP although it seem the Packet Asic fills
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* some data in the packet so we have a "broken" packet in
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* the trace
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*/
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call_dissector(clnp_handle, next_tvb, pinfo, tree);
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break;
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case 0x04:
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/* ARP - Always eth header in front */
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call_dissector(eth_handle, next_tvb, pinfo, tree);
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break;
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default:
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tisub = proto_tree_add_text (subtree, tvb, 24, length-24,
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"Unknown Protocol %u", proto);
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break;
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}
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}
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return;
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}
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void
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proto_register_redback(void)
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{
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static gint *ett[] = {
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&ett_redback,
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};
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proto_redback = proto_register_protocol("Redback", "Redback", "redback");
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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_redback(void)
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{
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dissector_handle_t redback_handle;
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ipv4_handle = find_dissector("ip");
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eth_handle = find_dissector("eth_withoutfcs");
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clnp_handle = find_dissector("clnp");
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arp_handle = find_dissector("arp");
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redback_handle = create_dissector_handle(dissect_redback, proto_redback);
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dissector_add("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle);
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}
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