forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
Some of the ASN.1 dissectors still generate a new_create_dissector_handle from the tool itself, so leave those for now. Change-Id: Ic6e5803b1444d7ac24070949f5fd557909a5641f Reviewed-on: https://code.wireshark.org/review/12484 Petri-Dish: Anders Broman <a.broman58@gmail.com> Reviewed-by: Michael Mann <mmann78@netscape.net>
306 lines
11 KiB
C
306 lines
11 KiB
C
/* packet-fefd.c
|
|
* Routines for the disassembly of the "Far End Failure Detection"
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* Copied from packet-udld.c
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
|
|
|
|
void proto_register_fefd(void);
|
|
void proto_reg_handoff_fefd(void);
|
|
|
|
/* Offsets in TLV structure. */
|
|
#define TLV_TYPE 0
|
|
#define TLV_LENGTH 2
|
|
|
|
static int proto_fefd = -1;
|
|
static int hf_fefd_version = -1;
|
|
static int hf_fefd_opcode = -1;
|
|
static int hf_fefd_flags = -1;
|
|
static int hf_fefd_flags_rt = -1;
|
|
static int hf_fefd_flags_rsy = -1;
|
|
static int hf_fefd_checksum = -1;
|
|
static int hf_fefd_tlvtype = -1;
|
|
static int hf_fefd_tlvlength = -1;
|
|
static int hf_fefd_device_id = -1;
|
|
static int hf_fefd_sent_through_interface = -1;
|
|
static int hf_fefd_data = -1;
|
|
|
|
static gint ett_fefd = -1;
|
|
static gint ett_fefd_flags = -1;
|
|
static gint ett_fefd_tlv = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
#define TYPE_DEVICE_ID 0x0001
|
|
#define TYPE_PORT_ID 0x0002
|
|
#define TYPE_ECHO 0x0003
|
|
#define TYPE_MESSAGE_INTERVAL 0x0004
|
|
#define TYPE_TIMEOUT_INTERVAL 0x0005
|
|
#define TYPE_DEVICE_NAME 0x0006
|
|
#define TYPE_SEQUENCE_NUMBER 0x0007
|
|
|
|
|
|
static const value_string type_vals[] = {
|
|
{ TYPE_DEVICE_ID, "Device ID" },
|
|
{ TYPE_PORT_ID, "Port ID" },
|
|
{ TYPE_ECHO, "Echo" },
|
|
{ TYPE_MESSAGE_INTERVAL, "Message interval" },
|
|
{ TYPE_TIMEOUT_INTERVAL, "Timeout interval" },
|
|
{ TYPE_DEVICE_NAME, "Device name" },
|
|
{ TYPE_SEQUENCE_NUMBER, "Sequence number" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define OPCODE_RESERVED 0x00
|
|
#define OPCODE_PROBE 0x01
|
|
#define OPCODE_ECHO 0x02
|
|
#define OPCODE_FLUSH 0x03
|
|
|
|
static const value_string opcode_vals[] = {
|
|
{ OPCODE_RESERVED, "Reserved" },
|
|
{ OPCODE_PROBE, "Probe" },
|
|
{ OPCODE_ECHO, "Echo" },
|
|
{ OPCODE_FLUSH, "Flush" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static int
|
|
dissect_fefd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *fefd_tree = NULL;
|
|
int offset = 0;
|
|
guint16 type;
|
|
guint16 length;
|
|
proto_tree *tlv_tree;
|
|
int real_length;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FEFD");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
if (tree) {
|
|
proto_item *flags_ti;
|
|
proto_tree *flags_tree;
|
|
|
|
ti = proto_tree_add_item(tree, proto_fefd, tvb, offset, -1, ENC_NA);
|
|
fefd_tree = proto_item_add_subtree(ti, ett_fefd);
|
|
|
|
/* FEFD header */
|
|
proto_tree_add_item(fefd_tree, hf_fefd_version, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(fefd_tree, hf_fefd_opcode, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
flags_ti = proto_tree_add_item(fefd_tree, hf_fefd_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
flags_tree = proto_item_add_subtree(flags_ti, ett_fefd_flags);
|
|
proto_tree_add_item(flags_tree, hf_fefd_flags_rt, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_fefd_flags_rsy, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
proto_tree_add_item(fefd_tree, hf_fefd_checksum, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
} else {
|
|
offset += 4; /* The version/opcode/flags/checksum fields from above */
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
type = tvb_get_ntohs(tvb, offset + TLV_TYPE);
|
|
length = tvb_get_ntohs(tvb, offset + TLV_LENGTH);
|
|
if (length < 4) {
|
|
if (tree) {
|
|
tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset, 4, /* XXX - expert info? */
|
|
ett_fefd_tlv, NULL, "TLV with invalid length %u (< 4)",
|
|
length);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
}
|
|
offset += 4;
|
|
break;
|
|
}
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_DEVICE_ID:
|
|
/* Device ID */
|
|
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
|
|
"Device ID: %s",
|
|
tvb_format_stringzpad(tvb, offset + 4,
|
|
length - 4));
|
|
|
|
if (tree) {
|
|
tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
|
|
length, ett_fefd_tlv, NULL, "Device ID: %s",
|
|
tvb_format_stringzpad(tvb, offset + 4, length - 4));
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_item(tlv_tree, hf_fefd_device_id, tvb, offset + 4,
|
|
length - 4, ENC_NA|ENC_ASCII);
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_PORT_ID:
|
|
real_length = length;
|
|
if (tvb_get_guint8(tvb, offset + real_length) != 0x00) {
|
|
/* The length in the TLV doesn't appear to be the
|
|
length of the TLV, as the byte just past it
|
|
isn't the first byte of a 2-byte big-endian
|
|
small integer; make the length of the TLV the length
|
|
in the TLV, plus 4 bytes for the TLV type and length,
|
|
minus 1 because that's what makes one capture work. */
|
|
real_length = length + 3;
|
|
}
|
|
|
|
col_append_sep_fstr(pinfo->cinfo, COL_INFO, NULL,
|
|
"Port ID: %s",
|
|
tvb_format_stringzpad(tvb, offset + 4, real_length - 4));
|
|
|
|
if (tree) {
|
|
tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
|
|
real_length, ett_fefd_tlv, NULL, "Port ID: %s",
|
|
tvb_format_text(tvb, offset + 4, real_length - 4));
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_item(tlv_tree, hf_fefd_sent_through_interface, tvb, offset + 4,
|
|
real_length - 4, ENC_NA|ENC_ASCII);
|
|
}
|
|
offset += real_length;
|
|
break;
|
|
|
|
case TYPE_ECHO:
|
|
case TYPE_MESSAGE_INTERVAL:
|
|
case TYPE_TIMEOUT_INTERVAL:
|
|
case TYPE_DEVICE_NAME:
|
|
case TYPE_SEQUENCE_NUMBER:
|
|
default:
|
|
tlv_tree = proto_tree_add_subtree_format(fefd_tree, tvb, offset,
|
|
length, ett_fefd_tlv, NULL, "Type: %s, length: %u",
|
|
val_to_str(type, type_vals, "Unknown (0x%04x)"),
|
|
length);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_fefd_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
if (length > 4) {
|
|
proto_tree_add_item(tlv_tree, hf_fefd_data, tvb, offset + 4,
|
|
length - 4, ENC_NA);
|
|
} else {
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
offset += length;
|
|
}
|
|
}
|
|
|
|
call_dissector(data_handle, tvb_new_subset_remaining(tvb, offset), pinfo, fefd_tree);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
void
|
|
proto_register_fefd(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_fefd_version,
|
|
{ "Version", "fefd.version", FT_UINT8, BASE_DEC, NULL, 0xE0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_opcode,
|
|
{ "Opcode", "fefd.opcode", FT_UINT8, BASE_DEC, VALS(opcode_vals), 0x1F,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_flags,
|
|
{ "Flags", "fefd.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_flags_rt,
|
|
{ "Recommended timeout", "fefd.flags.rt", FT_BOOLEAN, 8, NULL, 0x80,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_flags_rsy,
|
|
{ "ReSynch", "fefd.flags.rsy", FT_BOOLEAN, 8, NULL, 0x40,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_checksum,
|
|
{ "Checksum", "fefd.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_tlvtype,
|
|
{ "Type", "fefd.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_tlvlength,
|
|
{ "Length", "fefd.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_device_id,
|
|
{ "Device ID", "fefd.device_id", FT_STRINGZ, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_sent_through_interface,
|
|
{ "Sent through Interface", "fefd.sent_through_interface", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_fefd_data,
|
|
{ "Data", "fefd.data", FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_fefd,
|
|
&ett_fefd_flags,
|
|
&ett_fefd_tlv
|
|
};
|
|
|
|
proto_fefd = proto_register_protocol("Far End Failure Detection", "FEFD", "fefd");
|
|
proto_register_field_array(proto_fefd, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_fefd(void)
|
|
{
|
|
dissector_handle_t fefd_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
fefd_handle = create_dissector_handle(dissect_fefd, proto_fefd);
|
|
dissector_add_uint("llc.force10_pid", 0x0111, fefd_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|