227 lines
7.1 KiB
C
227 lines
7.1 KiB
C
/* packet-redback.c
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*
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* $Id$
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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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*
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* Start of RedBack SmartEdge 400/800 tcpdump trace disassembly
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* Copyright 2005-2008 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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#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_table_t osinl_subdissector_table;
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static dissector_table_t osinl_excl_subdissector_table;
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static dissector_handle_t ipv4_handle;
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static dissector_handle_t ethnofcs_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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static dissector_handle_t ppp_handle;
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static dissector_handle_t ppphdlc_handle;
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static dissector_handle_t data_handle;
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static int hf_redback_context = -1;
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static int hf_redback_flags = -1;
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static int hf_redback_circuit = -1;
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static int hf_redback_length = -1;
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static int hf_redback_protocol = -1;
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static int hf_redback_l3offset = -1;
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static int hf_redback_dataoffset = -1;
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static int hf_redback_padding = -1;
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static int hf_redback_unknown = -1;
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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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guint16 l3off, dataoff, proto;
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proto_item *ti;
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proto_tree *rbtree = NULL;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo,COL_PROTOCOL,"RBN");
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dataoff = tvb_get_ntohs(tvb, 20);
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l3off = tvb_get_ntohs(tvb, 22);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_redback, tvb, 0, -1, FALSE);
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rbtree = proto_item_add_subtree(ti, ett_redback);
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proto_tree_add_item(rbtree, hf_redback_context, tvb, 0, 4, FALSE);
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proto_tree_add_item(rbtree, hf_redback_flags, tvb, 4, 4, FALSE);
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proto_tree_add_item(rbtree, hf_redback_circuit, tvb, 8, 8, FALSE);
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proto_tree_add_item(rbtree, hf_redback_length, tvb, 16, 2, FALSE);
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proto_tree_add_item(rbtree, hf_redback_protocol, tvb, 18, 2, FALSE);
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proto_tree_add_item(rbtree, hf_redback_dataoffset, tvb, 20, 2, FALSE);
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proto_tree_add_item(rbtree, hf_redback_l3offset, tvb, 22, 2, FALSE);
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if (dataoff > 24) {
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proto_tree_add_item(rbtree, hf_redback_padding, tvb, 24, dataoff-24, FALSE);
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}
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}
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proto = tvb_get_ntohs(tvb, 18);
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switch(proto) {
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case 0x01:
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/*
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* IP on Ethernet - Incoming data points to an ethernet header
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* outgoing we have a pure IPv4 Packet
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*/
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next_tvb = tvb_new_subset_remaining(tvb, dataoff);
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if (dataoff == l3off)
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call_dissector(ipv4_handle, next_tvb, pinfo, tree);
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else if (dataoff+2 == l3off)
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call_dissector(ppp_handle, next_tvb, pinfo, tree);
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else if (dataoff+4 == l3off)
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call_dissector(ppphdlc_handle, next_tvb, pinfo, tree);
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else
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call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
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break;
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case 0x02:
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/*
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* This is ISIS - Either incoming with ethernet FCS
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* and CLNP - passed to the eth dissector or in case
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* of outgoing its pure ISIS and the linecard attaches
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* the ethernet and CLNP headers ...
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*
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*/
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next_tvb = tvb_new_subset_remaining(tvb, dataoff);
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if (l3off > dataoff) {
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call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
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} else {
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guint8 nlpid = tvb_get_guint8(tvb, dataoff);
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if(dissector_try_uint(osinl_subdissector_table, nlpid, next_tvb, pinfo, tree))
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break;
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next_tvb = tvb_new_subset_remaining(tvb, dataoff+1);
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if(dissector_try_uint(osinl_excl_subdissector_table, nlpid, next_tvb, pinfo, tree))
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break;
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next_tvb = tvb_new_subset_remaining(tvb, dataoff);
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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break;
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case 0x06: {
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/*
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* PPP Messages e.g. LCP, IPCP etc - possibly on ethernet in case of PPPoE.
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* PPPoE messages are Protocol 8 ...
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*/
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guint32 flags;
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flags = tvb_get_ntohl(tvb, 4);
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if (flags & 0x00400000) {
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next_tvb = tvb_new_subset_remaining(tvb, dataoff);
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} else {
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if (tree)
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proto_tree_add_item(rbtree, hf_redback_unknown, tvb, dataoff, 4, FALSE);
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next_tvb = tvb_new_subset_remaining(tvb, dataoff+4);
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}
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if (l3off == dataoff) {
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call_dissector(ppp_handle, next_tvb, pinfo, tree);
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} else {
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call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
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}
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break;
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}
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case 0x03: /* Unicast Ethernet tx - Seen with PPPoE PADO */
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case 0x04: /* Unicast Ethernet rx - Seen with ARP */
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case 0x08: /* Broadcast Ethernet rx - Seen with PPPoE PADI */
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next_tvb = tvb_new_subset_remaining(tvb, dataoff);
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call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
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break;
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default:
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if (tree)
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proto_tree_add_text (rbtree, tvb, 24, -1, "Unknown Protocol Data %u", proto);
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break;
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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 hf_register_info hf[] = {
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{ &hf_redback_context,
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{ "Context", "redback.context", FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_flags,
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{ "Flags", "redback.flags", FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_circuit,
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{ "Circuit", "redback.circuit", FT_UINT64, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_length,
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{ "Length", "redback.length", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_protocol,
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{ "Protocol", "redback.protocol", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_l3offset,
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{ "Layer 3 Offset", "redback.l3offset", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_dataoffset,
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{ "Data Offset", "redback.dataoffset", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_padding,
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{ "Padding", "redback.padding", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_redback_unknown,
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{ "Unknown", "redback.unknown", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }}
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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_field_array(proto_redback, 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_redback(void)
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{
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dissector_handle_t redback_handle;
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osinl_subdissector_table = find_dissector_table("osinl");
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osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
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ipv4_handle = find_dissector("ip");
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data_handle = find_dissector("data");
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ethnofcs_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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ppp_handle = find_dissector("ppp");
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ppphdlc_handle = find_dissector("ppp_hdlc");
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redback_handle = create_dissector_handle(dissect_redback, proto_redback);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle);
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}
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