259 lines
7.8 KiB
C
259 lines
7.8 KiB
C
/* packet-redback.c
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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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* Ericsson SmartEdge tcpdump trace disassembly
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* Copyright 2005-2014 Florian Lohoff <f@zz.de>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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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/expert.h>
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#include <wiretap/wtap.h>
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void proto_register_redback(void);
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void proto_reg_handoff_redback(void);
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static dissector_handle_t redback_handle;
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static gint ett_redback = -1;
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static dissector_table_t osinl_incl_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 ipv6_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 int proto_redback = -1;
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static int hf_redback_circuit = -1;
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static int hf_redback_context = -1;
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static int hf_redback_dataoffset = -1;
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static int hf_redback_flags = -1;
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static int hf_redback_l3offset = -1;
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static int hf_redback_length = -1;
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static int hf_redback_padding = -1;
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static int hf_redback_protocol = -1;
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static int hf_redback_unknown = -1;
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static expert_field ei_redback_protocol = EI_INIT;
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static int
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dissect_redback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint16 l3off, dataoff, proto;
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proto_item *ti, *protocol_item;
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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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ti = proto_tree_add_item(tree, proto_redback, tvb, 0, -1, ENC_NA);
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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, ENC_BIG_ENDIAN);
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proto_tree_add_item(rbtree, hf_redback_flags, tvb, 4, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(rbtree, hf_redback_circuit, tvb, 8, 8, ENC_BIG_ENDIAN);
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proto_tree_add_item(rbtree, hf_redback_length, tvb, 16, 2, ENC_BIG_ENDIAN);
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protocol_item = proto_tree_add_item(rbtree, hf_redback_protocol, tvb, 18, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(rbtree, hf_redback_dataoffset, tvb, 20, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(rbtree, hf_redback_l3offset, tvb, 22, 2, ENC_BIG_ENDIAN);
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if (dataoff > 24) {
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proto_tree_add_item(rbtree, hf_redback_padding, tvb, 24, dataoff-24, ENC_NA);
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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 it's 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_incl_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_data_dissector(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 & 0x04000000) {
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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, ENC_NA);
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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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case 0x09: /* IPv6 either encapsulated as ethernet or native ip */
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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(ipv6_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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default:
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expert_add_info(pinfo, protocol_item, &ei_redback_protocol);
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break;
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}
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return tvb_captured_length(tvb);
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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",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_flags,
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{ "Flags", "redback.flags",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_circuit,
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{ "Circuit", "redback.circuit",
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FT_UINT64, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_length,
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{ "Length", "redback.length",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_protocol,
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{ "Protocol", "redback.protocol",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_l3offset,
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{ "Layer 3 Offset", "redback.l3offset",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_dataoffset,
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{ "Data Offset", "redback.dataoffset",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_padding,
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{ "Padding", "redback.padding",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_redback_unknown,
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{ "Unknown", "redback.unknown",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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},
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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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static ei_register_info ei[] = {
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{ &ei_redback_protocol, { "redback.protocol.unknown", PI_PROTOCOL, PI_WARN, "Unknown Protocol Data", EXPFILL }},
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};
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expert_module_t* expert_redback;
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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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redback_handle = register_dissector("redback", dissect_redback, proto_redback);
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proto_register_subtree_array(ett, array_length(ett));
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expert_redback = expert_register_protocol(proto_redback);
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expert_register_field_array(expert_redback, ei, array_length(ei));
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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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osinl_incl_subdissector_table = find_dissector_table("osinl.incl");
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osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
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ipv4_handle = find_dissector_add_dependency("ip", proto_redback);
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ipv6_handle = find_dissector_add_dependency("ipv6", proto_redback);
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ethnofcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_redback);
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clnp_handle = find_dissector_add_dependency("clnp", proto_redback);
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arp_handle = find_dissector_add_dependency("arp", proto_redback);
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ppp_handle = find_dissector_add_dependency("ppp", proto_redback);
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ppphdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_redback);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle);
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}
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/*
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* Editor modelines - https://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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