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wireshark/epan/dissectors/packet-redback.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

261 lines
8.8 KiB
C
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/* packet-redback.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
*
* Ericsson SmartEdge tcpdump trace disassembly
* Copyright 2005-2014 Florian Lohoff <f@zz.de>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define NEW_PROTO_TREE_API
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <wiretap/wtap.h>
void proto_register_redback(void);
void proto_reg_handoff_redback(void);
static dissector_handle_t redback_handle;
static gint ett_redback = -1;
static dissector_table_t osinl_incl_subdissector_table;
static dissector_table_t osinl_excl_subdissector_table;
static dissector_handle_t ipv4_handle;
static dissector_handle_t ipv6_handle;
static dissector_handle_t ethnofcs_handle;
static dissector_handle_t clnp_handle;
static dissector_handle_t arp_handle;
static dissector_handle_t ppp_handle;
static dissector_handle_t ppphdlc_handle;
static header_field_info *hfi_redback = NULL;
#define REDBACK_HFI_INIT HFI_INIT(proto_redback)
static header_field_info hfi_redback_context REDBACK_HFI_INIT =
{ "Context", "redback.context", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_flags REDBACK_HFI_INIT =
{ "Flags", "redback.flags", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_circuit REDBACK_HFI_INIT =
{ "Circuit", "redback.circuit", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_length REDBACK_HFI_INIT =
{ "Length", "redback.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_protocol REDBACK_HFI_INIT =
{ "Protocol", "redback.protocol", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_l3offset REDBACK_HFI_INIT =
{ "Layer 3 Offset", "redback.l3offset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_dataoffset REDBACK_HFI_INIT =
{ "Data Offset", "redback.dataoffset", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_padding REDBACK_HFI_INIT =
{ "Padding", "redback.padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL };
static header_field_info hfi_redback_unknown REDBACK_HFI_INIT =
{ "Unknown", "redback.unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL };
static expert_field ei_redback_protocol = EI_INIT;
static int
dissect_redback(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint16 l3off, dataoff, proto;
proto_item *ti, *protocol_item;
proto_tree *rbtree = NULL;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo,COL_PROTOCOL,"RBN");
dataoff = tvb_get_ntohs(tvb, 20);
l3off = tvb_get_ntohs(tvb, 22);
ti = proto_tree_add_item(tree, hfi_redback, tvb, 0, -1, ENC_NA);
rbtree = proto_item_add_subtree(ti, ett_redback);
proto_tree_add_item(rbtree, &hfi_redback_context, tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(rbtree, &hfi_redback_flags, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(rbtree, &hfi_redback_circuit, tvb, 8, 8, ENC_BIG_ENDIAN);
proto_tree_add_item(rbtree, &hfi_redback_length, tvb, 16, 2, ENC_BIG_ENDIAN);
protocol_item = proto_tree_add_item(rbtree, &hfi_redback_protocol, tvb, 18, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(rbtree, &hfi_redback_dataoffset, tvb, 20, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(rbtree, &hfi_redback_l3offset, tvb, 22, 2, ENC_BIG_ENDIAN);
if (dataoff > 24) {
proto_tree_add_item(rbtree, &hfi_redback_padding, tvb, 24, dataoff-24, ENC_NA);
}
proto = tvb_get_ntohs(tvb, 18);
switch(proto) {
case 0x01:
/*
* IP on Ethernet - Incoming data points to an ethernet header
* outgoing we have a pure IPv4 Packet
*/
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
if (dataoff == l3off)
call_dissector(ipv4_handle, next_tvb, pinfo, tree);
else if (dataoff+2 == l3off)
call_dissector(ppp_handle, next_tvb, pinfo, tree);
else if (dataoff+4 == l3off)
call_dissector(ppphdlc_handle, next_tvb, pinfo, tree);
else
call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
break;
case 0x02:
/*
* This is ISIS - Either incoming with ethernet FCS
* and CLNP - passed to the eth dissector or in case
* of outgoing it's pure ISIS and the linecard attaches
* the ethernet and CLNP headers ...
*
*/
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
if (l3off > dataoff) {
call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
} else {
guint8 nlpid = tvb_get_guint8(tvb, dataoff);
if(dissector_try_uint(osinl_incl_subdissector_table, nlpid, next_tvb, pinfo, tree))
break;
next_tvb = tvb_new_subset_remaining(tvb, dataoff+1);
if(dissector_try_uint(osinl_excl_subdissector_table, nlpid, next_tvb, pinfo, tree))
break;
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
call_data_dissector(next_tvb, pinfo, tree);
}
break;
case 0x06: {
/*
* PPP Messages e.g. LCP, IPCP etc - possibly on ethernet in case of PPPoE.
* PPPoE messages are Protocol 8 ...
*/
guint32 flags;
flags = tvb_get_ntohl(tvb, 4);
if (flags & 0x04000000) {
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
} else {
if (tree)
proto_tree_add_item(rbtree, &hfi_redback_unknown, tvb, dataoff, 4, ENC_NA);
next_tvb = tvb_new_subset_remaining(tvb, dataoff+4);
}
if (l3off == dataoff) {
call_dissector(ppp_handle, next_tvb, pinfo, tree);
} else {
call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
}
break;
}
case 0x03: /* Unicast Ethernet tx - Seen with PPPoE PADO */
case 0x04: /* Unicast Ethernet rx - Seen with ARP */
case 0x08: /* Broadcast Ethernet rx - Seen with PPPoE PADI */
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
break;
case 0x09: /* IPv6 either encapsulated as ethernet or native ip */
next_tvb = tvb_new_subset_remaining(tvb, dataoff);
if (dataoff == l3off)
call_dissector(ipv6_handle, next_tvb, pinfo, tree);
else
call_dissector(ethnofcs_handle, next_tvb, pinfo, tree);
break;
default:
expert_add_info(pinfo, protocol_item, &ei_redback_protocol);
break;
}
return tvb_captured_length(tvb);
}
void
proto_register_redback(void)
{
#ifndef HAVE_HFI_SECTION_INIT
static header_field_info *hfi[] = {
&hfi_redback_context,
&hfi_redback_flags,
&hfi_redback_circuit,
&hfi_redback_length,
&hfi_redback_protocol,
&hfi_redback_l3offset,
&hfi_redback_dataoffset,
&hfi_redback_padding,
&hfi_redback_unknown,
};
#endif
static gint *ett[] = {
&ett_redback
};
static ei_register_info ei[] = {
{ &ei_redback_protocol, { "redback.protocol.unknown", PI_PROTOCOL, PI_WARN, "Unknown Protocol Data", EXPFILL }},
};
expert_module_t* expert_redback;
int proto_redback;
proto_redback = proto_register_protocol("Redback", "Redback", "redback");
hfi_redback = proto_registrar_get_nth(proto_redback);
redback_handle = register_dissector("redback", dissect_redback, proto_redback);
proto_register_fields(proto_redback, hfi, array_length(hfi));
proto_register_subtree_array(ett, array_length(ett));
expert_redback = expert_register_protocol(proto_redback);
expert_register_field_array(expert_redback, ei, array_length(ei));
}
void
proto_reg_handoff_redback(void)
{
osinl_incl_subdissector_table = find_dissector_table("osinl.incl");
osinl_excl_subdissector_table = find_dissector_table("osinl.excl");
ipv4_handle = find_dissector_add_dependency("ip", hfi_redback->id);
ipv6_handle = find_dissector_add_dependency("ipv6", hfi_redback->id);
ethnofcs_handle = find_dissector_add_dependency("eth_withoutfcs", hfi_redback->id);
clnp_handle = find_dissector_add_dependency("clnp", hfi_redback->id);
arp_handle = find_dissector_add_dependency("arp", hfi_redback->id);
ppp_handle = find_dissector_add_dependency("ppp", hfi_redback->id);
ppphdlc_handle = find_dissector_add_dependency("ppp_hdlc", hfi_redback->id);
dissector_add_uint("wtap_encap", WTAP_ENCAP_REDBACK, redback_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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